The driver board EGS002 was created especially for single-phase sinusoid inverters.
It makes use of an IR2110S driver chip and an ASIC EG8010 control chip.
Protection against voltage, current, and temperature is included into the driver board.
LEDs are used to indicate warnings, and fan control is included.
Jumpers enable the setting of dead time, soft start mode, and 50/60Hz AC output.
EGS002, which is an enhancement over EGS001, keeps the original interfaces of EGS001 compatible.
In addition, cross-conduction prevention logic is included into EGS002 for improved anti-interference performance.
For user convenience, an LCD display interface is provided, allowing the chip's integrated display capabilities to be used.
Here are some general datasheet for the EGS002:
General Datasheet
- Input voltage range: +15V - +20V DC and +5V
- Output voltage range: 110V or 220V AC (depending on the transformer used)
- Output frequency: 50Hz or 60Hz (depending on the configuration of the chip)
- Maximum output power: approximately 300W
- PWM frequency: 16kHz
- Over-current protection: Yes
- Over-voltage protection: Yes
- Under-voltage protection: Yes
- Over-temperature protection: Yes
- Standby power consumption: less than 1W
The EGS002 is designed to work with a center-tapped transformer, and can generate a pure sine wave output waveform using a combination of PWM and SPWM modulation techniques.
It has a low standby power consumption, high efficiency, and comprehensive protection features that make it suitable for small-scale renewable energy applications.
Note that these specifications are general and can vary depending on the specific implementation of the EGS002 inverter board.
It's always best to consult the datasheet or technical specifications provided by the supplier or manufacturer for the specific board you are working with.
Circuit Diagram for External MOSFETs
How to Connect
Connecting the EGS002 board to external MOSFETs is feasible, however it needs a few improvements to the board and good knowledge of the circuit design.
Listed below are the recommended methods to connect the EGS002 board to external MOSFETs:
Get rid of the present MOSFETs from the EGS002 board.
This would call for desoldering the MOSFETs from the board and eliminating any associated elements (for example gate resistors and diodes).
Choose the external MOSFETs that you would like to work with.
Ensure these are rated for the voltage and current specifications of your application.
Connect the gate of each external MOSFET to the equivalent gate drive signal on the EGS002 board.
The gate drive signals are generally named as "G" on the board.
Hook up the drain of each external MOSFET to the positive output of the center-tapped transformer.
The positive output of the transformer is normally attached to the positive terminal of the output capacitor.
Hook up the source of each external MOSFET to the negative output of the center-tapped transformer.
The negative output of the transformer is usually attached to the negative pin of the output capacitor.
Insert any essential elements to the circuit, for example gate resistors and diodes, to guarantee correct functioning of the MOSFETs.
Customize the control jumpers on the EGS002 board make it possible for external MOSFET functioning.
This might demand modifying the jumper settings for the "EGS002/04" and "EGS002/05" pins on the board, along with setting up the "EGS002/01" jumper to "ext".
It is critical to remember that changing the EGS002 board in this manner could be complicated and necessitates a great knowledge of the circuit design.
If you are not knowledgeable in electronics or inverter design, it's best to speak with an experienced person or work with a pre-built inverter board that actually contains external MOSFETs
LED Warning Indicator
The EGS002 driver board is equipped with an LED warning alert feature that assists users in identifying potential issues based on the following patterns:
- Normal Operation: The LED remains continuously illuminated.
- Overcurrent Condition: The LED blinks twice, then turns off for a 2-second interval, repeating in a cyclic manner.
- Overvoltage Situation: The LED blinks three times, followed by a 2-second off period, and then repeats this cycle.
- Undervoltage Problem: A sequence of four LED blinks occurs, succeeded by a 2-second pause, and the cycle continues.
- Overtemperature Issue: The LED blinks five times, pauses for 2 seconds, and maintains this cyclic pattern.
Pin Description and Working Details for EGS002
| Pin | Name | I/O | Output Current Feedback/Descriptions |
|---|---|---|---|
| 1 | IFB | I | Pin voltage exceeding +0.5V triggers overcurrent protection |
| 2 | GND | GND | Ground |
| 3 | ILO | O | Right H-bridge Low side MOSFET gate driver output |
| 4 | GND | GND | Ground |
| 5 | VS1 | O | Right H-bridge high-side gate driver return path |
| 6 | 1HO | O | Right H-bridge High side MOSFET gate driver output |
| 7 | GND | GND | Ground |
| 8 | 2LO | O | Left H-bridge Low side MOSFET gate driver output |
| 9 | VS2 | O | Left H-bridge high-side gate driver return path |
| 10 | 2HO | O | Left H-bridge High side MOSFET gate driver output |
| 11 | GND | GND | Ground |
| 12 | +12V | +12V | +12V Input DC voltage input, can be between 10V-15V. |
| 13 | GND | GND | Ground |
| 14 | +5V | +5V | +5V DC supply |
| 15 | VFB | I | AC output voltage feedback to regulate the output voltage, requires +3V to activate. |
| 16 | TFB | I | Temperature monitored with overtemp protection at +4.3V pin voltage |
| 17 | FANCTR | O | Temperature-controlled fan. FANCTR turns the fan on (high output, 1) when above 45°C and off (low output, 0) below 40°C. |
Pinout for LCD Display Connection
| PinOut | Name | I/O | Description |
|---|---|---|---|
| *1 | +5V | Power Input | LCD power supply |
| *2 | GND | Ground | Ground connection |
| *3 | LCDDI | I/O | LCD serial data |
| *4 | LCDCLK | Output | LCD serial clock |
| *5 | LCDEN | Output | LCD chip select |
| *6 | LED+ | Power Input | Backlight power supply |
| *7 | LED- | Ground | Backlight ground connectionpen_spark |
Jumper Setting Details
| Designator | Name | Mark | JP jumper shorted selects [setting description] |
|---|---|---|---|
| 1 | FS0 | JP1 JP5 | JP1 shorted sets AC output to 60Hz Shorting JP5 sets the frequency to 50Hz |
| 2 | SST | JP2 JP6 | JP2 short enables 3s soft start JP6 short disables soft start |
| 3 | DT0 | JP3 JP7 | JP7+JP8 shorted: dead time 300ns JP3+JP8 shorted: dead time 500ns |
| 4 | DT1 | JP4 JP8 | JP4+JP7 shorted: dead time 1.0us JP3+JP4 shorted: dead time 1.5us |
| *5 | LED+ | JP9 | JP9 short: LCD backlight ON JP9 open: LCD backlight OFF |
Default Jumper Settings:
- Output Frequency: 50Hz (JP5 shorted)
- Soft Start: Enabled (JP2 shorted)
- Dead Time: 300ns (JP7 and JP8 shorted)
Jumper Customization:
These jumpers can be manipulated or changed as per users specific needs.
Note:
- Avoid Shorting Conflicting Jumpers: Only one jumper per function can be shorted at a time. For example, you cannot short both JP1 (60Hz) and JP5 (50Hz) simultaneously.
How to Test EGS002 Driver Board
Initial Setup
- Grounding Test Points: During testing, connect the following pins to ground: IFB, VS1, VS2, VFB, and TFB.
- Power Supply Connections:
- Connect +5V DC to the +5V pin.
- Connect +12V DC to the +12V pin (voltage range: 12V to 15V).
Testing Procedure:
Waveform Observation:
- Connect an oscilloscope to test points TEST1 through TEST4 to check the waveforms.
- TEST1 & TEST2: Output fundamental frequency square wave (appears as the blue CH1 waveform in Figure 5-3).
- TEST3 & TEST4: Output unipolar modulation wave. When connected to an RC filter, these points will output the waveform shown as the red CH2 waveform.
Undervoltage Protection Test:
- Since the VFB pin is grounded, the undervoltage protection will activate after 3 seconds.
- This will cause TEST1 through TEST4 to shut down.
- An LED will blink four times, then turn off for 2 seconds, and this cycle will repeat.
- Reconnecting the EGS002 to the power supply will allow you to observe waveforms for another 3 seconds before the undervoltage protection activates again.
Have Questions? Please Leave a Comment. I have answered over 50,000. Kindly ensure the comments are related to the above topic.
Hello Mr. Swagatam, I just ordered and got this egs002 driver card and I want to use it to build a1kva inverter circuit. My problem is that I would like to shutdown the system at low voltage, please which of the pins would I use to implement that?
Hello Chinomso,
You can use the TFB, or the VFB, or the IFB to turn off the inverter at low voltage.
For low voltage detection you can configure an op-amp or a comparator IC and then connect its output with one of these pins.
Hi, Swagatam! Very Good… Congratulations!
Thank you Douglas!
hello, I am repairing a green cell converter of 1500w and I’ai the card of the dead secondary .j’ai mounted an egs002 to make the 230v pure sinus, but I’ai a problem the output ac is a 290v .i do not find the cause.
Hi, did you adjust the preset or the variable resistor associated with the pin#15 of the EGS002? That preset sets the maximum output voltage and can be suitably adjusted.
Здравствуйте Сер. Хочу сделать силовую часть с использованием IGBT транзисторов и оптопар. Мне 65лет но знаний не хватает. Не могли бы Вы нарисовать схему с использованием оптопар. (ACPL3120) Спасибо
Hi,
sorry I do not know what ACPL3120 optopar means, please elaborate on this…
Hello
I want to make 900va inverter using ugs002 driver.
But where can I purchase transformer for this? price?
is it possible to do without it?
thanks
Hello JK, you can try searching for it on amazon or eBay, or even on Google.
Hello Mr Swagatam, I build this system and I have my module led blinking 3 times and stop and repeat the cycle again. What is Overvoltage problem, what could be the problem and how do I solve it please.
Hi Ekoe,
Did you adjust the over-voltage preset correctly, please try adjusting that preset and check whether the problem solves or not?
Also make sure the +12V, +5V supplies are given from a regulated IC, such as 7812 and 7805.
Year my big man, I did by adjusting it several times but it has refused.
If adjusting the over voltage preset is not controlling the output voltage then the problem could be something internal to the board.
My second question is about how to use Shunt resistor effectively in this inverter system, supposing I am building 8 power transistor system, or my Egs002 module will power 8 transistors in the inverter construction, what should be the shunt resistor value and the number of to apply in my circuit.
The over-current shunt resistor R24 can be calculated using the following formula:
R24 = 0.5 / maximum current limit.
For example if the over-current limit is 30 amps, then:
R24 = 0.5 / 30 = 0.016 ohms
Power rating will be: 0.5 * 30 = 15 watts.
Hi, is it possible to use H IGBT module Insted of Mosfet ?
Yes, you can use IGBTs in place of the MOSFETs
sir,
How can I add a automatic battery charging circuit to the above circuit.
thanking you sir,
Hi BK,
You will need to add the battery charger circuit separately, which will associated only with the battery.
There are plenty of good and simple battery charger circuits explained in this blog, you can select any one them as per your choice.
Let me know if you have any further doubts or questions…
Good morning sir. Thanks for your reply.
I am going to add automatic battery charger circuit using lm 358 published in your blog. I request you sir, to clarify is there any point or pin in the EGS002 board, from where I can pick up low battery voltage triggering signal that can be used for auto cut off function of the battery through lm 358 circuit. I believe that such triggering signal can be obtained from LED point.
thanking you sir,
Hi BK,
Just attach the following circuit with your battery +/- terminals, that’s all, the circuit will automatically always keep your battery fully charged:
Make sure to change the TIP32 with TIP36, and BC547 with BD139.Adjust the preset to the desired low voltage switch ON threshold…
Hello sir
I am intend to construct this circuit using a PCB to ease the stress of long time consumption. How do I get a PCB?
Hello Anthony,
Are you referring to the PCB design for the MOSFETs and the feedback stage?
Sorry, a ready-made PCB may not be available for this, you may have to contact a professional PCB designer for this.
dear sir please help me. i have made this circuit exactly as same as this design. when it is given 12VDC despite of 400VDC, it works properly and get pure sine wawe signal. but when i provide 400VDC , suddenly i burned 2 mosfets of same side of H briged 2 times
Hello Chathuranga, There is some confusion, did you connect the +5V, +12V and the +400V DCs exactly as given in the diagram?
Which MOSFETs did you use?
Please provide the above info, I will try to figure it out..
Hello Mr Swagatam, I build this system and I have my module led blinking 3 times and stop and repeat the cycle again. What is Overvoltage problem, what could be the problem and how do I solve it please.
Hi Ekoe,
Did you adjust the over-voltage preset correctly, please try adjusting that preset and check whether the problem solves or not?
Also make sure the +12V, +5V supplies are given from a regulated IC, such as 7812 and 7805.
best ways to prevent egs002 from switching ON & OFF during operation, Er
EGS002 might switch ON OFF only if there’s some fault in the operation or the output voltage level or an overload.
It can be prevented by operating the board with correct specifications.
Sir can we get pefect fixed 220v rms volts with this circuit if we get power from 7soler panels that have ocv 360v and on full load 320v dc
Hello Afzal,
yes you can get perfect fixed 220v rms volts with this circuit from 7 solar panels with 360v and on full load 320v dc
Have you actually built this circuit as you have explained and it is working? Can you please provide a video of such build?
I had checked it long time back, I don’t have any videos… however the circuit worked for me, and not only me but many other users.
Yes sir, sinusoidal pulse width modulation will create harmonics that will interfere with audio equipment sharing the same input power source. Isolation transformers will reduce noise, especially isolation transformers with anti-interference shields.
You are right, Thieu.
Hello sir, high voltage external mosfet inverter is very difficult to eliminate noise. It causes high frequency interference to audio equipment, especially to highly sensitive speakers.
I have to run the input voltage from 24 to 30v Dc and combine the transformer to get the output power so the noise is reduced by 90%.
That’s okay but not as perfect as grid power or a commercial inverter.
Hello Thieu,
I am sure the noise is due to the harmonics generated by the high frequency SPWM waves.
When you use a transformer the SPWM frequency is smoothed and converted into pure sine wave and the noise is reduced.
Alternatively, the noise could be also reduced by optimizing the L1 winding and the C2 value.
can i use 1602 lcd with egs002 module
Please check whether your LCD module has all the pinouts available which are specified in the above article. If it has all those pinouts then you can use it.
Hello sir, I added a 470 n capacitor to the low mosfet S pin and the high D pin of the left and right bridges and the noise was reduced by about 60%.
I have to experiment to see what value that capacitor has to eliminate noise.
That’s great Thieu, glad you could find the solution to the noise issue.
Hello sir, I added 2000u/ 450v to the DC mosfet bridge but the Audio noise is still there.
Just supply AC power from the inverter to the reel to reel (don’t turn on the switch for the motor to run) but there is already noise.
It proves that the inverter circuit is very noisy for audio frequencies.
Hello Thieu, did you check the output waveform on oscilloscope? Is it a pure sine wave without any distortions?
I am unable to figure out the source of the noise.
Maybe you can try removing all the 1N4148 diodes connected across the gate 4.7 ohm resistors and check the response.
Hello sir, the Egs002 inverter circuit causes too much noise to the Radio.
I checked: with a standard sine wave oscilloscope, frequency exactly 60 hz. When running reel to reel for Audio, the source noise is too loud.
The inverter’s power source is caused by mosfet pairs causing noise waves. Can noise be eliminated by adding capacitors to the mosfet pins?
Furthermore, it is possible that the pulse frequency will be higher than 60hz because the motor runs faster (because I took the reel to reel to test the power at 100v/60hz from a genuine sine wave UPS and found that the speed of the motor is correct). .
Hello Thieu,
For eliminating the noise, you can try adding a high value capacitor right across the DC supply voltage rails which is applied to the MOSFET H-bridge. Meaning, connect this capacitor between the High-side MOSFET drains and Low-side MOSFET sources.
I don’t think the 60 Hz or 50 Hz frequencies can be further tweaked, there’s no such facility currently available in the EGS0002 board.
Hello sir, after assembling the EGS 002 inverter, (without 2mm h inductor, 2.2u capacitor), I installed a frequency meter (analog meter displayed with a needle pointing to the 100v voltage scale). then measure 65 hz if jumper JP5 is set (ie 50 hz) and the needle shows 75 hz if JP1 is set (ie 60 hz).
I tried measuring the national grid frequency of 100v/50 hz with the same frequency meter, the needle pointed to exactly 50 hz. (so the clock frequency is still standard).
I completed the correct 1.98 mm h inductor and 2.2u capacitor, then re-measured the rib frequency to match the inverter frequency I set (51 hz if set to JP5 and 62 hz if set to JP1).
So are the two factors L and C deceiving the frequency?
Second problem: the location of inductor L and capacitor C, it killed many of my mosfets. (only die in 1 left).
Because of the arrangement of L and C, I didn’t pay attention, placing C first and L last, so the mosfet kept dying for unknown reasons.
I have assembled many types of amplifier circuits, the components must be arranged so that the circuit does not self-excite (especially audio circuits with large amplification coefficients). But here in the inverter circuit, how can L and C activate themselves? I really don’t understand, because the inductor has a small resistance R and the capacitor C is installed before or after, will the current increase and the mosfet die?
Hello Thieu,
Yes, the inductor can affect the output frequency reading on the meter. When you are not connecting the inductor/capacitor filter, the sine wave is not filtered and is composed of SPWM high frequency, this frequency can interfere with the main 60HZ frequency and cause incorrect reading on the meter. When you connect the LC filter, the SPWM frequency is fileted and the output is just like a pure sine wave AC which allows the meter to read the 60HZ sine wave AC correctly.
I am not sure how the LC filter assembly could blow the MOSFETs, maybe it’s due to voltage spikes generated by the inductor.
You can try using MOSFETs rated with higher voltage, such as 400V, and check the results.
Or you can try connecting a high voltage capacitor such as 10uF/400V across the supply lines of the MOSFETs, between the high side MOSFET drains and the low side MOSFET sources.
Hi swagatam, I once said that I have seen some Indian inverter driving the output MOSFET’S (both the high side MOSFET’S and the low side MOSFET’S) with an SPWM signals but you said it is not proper, that it only the lower MOSFET’S need to be driven with an SPWM signals. But this EGS002 module is driving both the high side MOSFET’S and the low side MOSFET’S with an SPWM signals and the MOSFET’S are operating well, even the sine wave generated is clean with no distortion when loading the system with an inducting loads.
Can you explain to us how that is possible.
Thanks for the good.
Hi Emmanuel,
According to me switching all the 4 MOSFETs with identical SPWM is unnecessary and illogical. Imagine two switches and a bulb connected in series and you want the bulb to blink with a certain pattern, what would you do? Would you operate both the switches together, or just one of the two?
That said, operating both the mechanical switches in the above example could be much easier compared to a 4 N-channel MOSFET H-bridge because here the high side MOSFETs are associated with bootstrapping network. Interfering with the bootstrapping with an SPWM cannot be a good idea unless it has a distinct advantage, which I am unable to figure out.
On the contrary, the low side MOSFETs are like perfect ON/OFF switches since their sources are directly linked with the ground line and these MOSFETs can be forced to follow the SPWM very accurately. If the low side MOSFETs follow the SPWM pattern the load will be forced to operate with the same pattern since the high side, low side MOSFETs and the load are all connected in series (diagonally).
If EGS002 is operating all the 4 MOSFFETs with SPWM then you must ask the manufacturer what’s the real advantage behind this concept?
Vâng, cảm ơn ngài.
Hello sir, I still do not understand the capacity of the H-bridge inverter, so I would like to ask you that the H-bridge has 2 pairs (ie 4 mosfet) each mosfet has a capacity (for example: 125w), then the capacity of the inverter will be 125 W or 250W.
Hello Thieu,
Inverter Capacity is determined by the battery Ah rating and the transformer, since there’s no transformer in your circuit, the output current and power is solely determined by the battery power.
The MOSFETTs are like switches, they do not decide the power output, but they must be appropriately rated as per the load capacity.
Hello sir, maybe it’s because Google’s translation from Vietnamese is not accurate.
My EGS still complies with DC mosfet input/AC output of 140v/ 1.41=99.3 v(AC).
It’s not about the MOSFETs, I was referring to the AC output to the load, it will be lower than the input DC. If input DC is 110V, the output will be 78V AC RMS.
Hello sir, Yes, the maximum voltage when micro-adjusting R10k is up to 110vAC.
If set to 110 vAC, the voltage will decrease depending on the load, so I set the output from 100v to 103v so there will be no voltage drop under load.
I checked the temperature and it’s normal.
What I’m still wondering is that when there is a load, it consumes too much current at the input. ( I haven’t measured the input current but I hear a humming sound at the input power transformer).
Hello Thieu,
If the input voltage to the H-bridge MOSFET is 110V DC, then the AC sine wave output cannot be 110V, it should be around 110 / 1.41 = 78V AC RMS.
Dear Sir.
I don’t know if the EGS002 I bought has a defect due to the manufacturer, but I had to adjust the 200k resistor on the VFB battery up to 400k for it to work normally.
I power the Mosfet with 110v Ac (of course it must be converted to DC) and the output is 100v AC. So a loss of 10%.
I used an Oscilloscope (old model Analog) to observe the sine wave and found that the sine wave was correct, but I wondered if there was a problem with the inverter current. I used a digital meter to measure the voltage, and the following happened:
– Measured with an analog meter Or a Chinese digital clock (cheap) will read the numbers normally
– Measured with a standard European digital clock (bought in Poland), the number will flash continuously as if the electrical pulse is intermittent.
I’m testing running 100v/ 60 hz devices on that EGS inverter.
Hello Thieu,
The resistive divider at pin#15 using 200k and 10k preset determines the output voltage level. So if you have adjusted the 200k to 400k for the intended output AC level, then it is fine according to me.
If the output is sinewave then there will be a loss of voltage due to RMS conversion. Please check the peak voltage, it should be 110V.
Please check the output voltage by adding some load at the output. Voltmeter cannot verify current specification, to verify current you can connect an ammeter in series with the load.
Hi sir, i did the design,but got the problem that led blinks 4 time then shut dowm then after 2secs,the board start and repeats the cycle. Am also getting 300v at the output,the preset seems not adjusting the output. How do I solve the issue sir,will really appreciate your quick response.
Hi Evans, from your LED indication, it seems like a battery undervoltage problem.
This could be happening due to a discharged battery or an overload.
Please check the setup without connoting any load at the output.
This EGS002 module would have been a great module if it has the ability to function as an uninterrupted power supply “UPS” ie be able to switch from battery mode to an AC main mode and charge back the battery when the AC mains returns.
Hello sir, I use the external mosfet circuit diagram for the EGS002 module to create a genuine wave with a standard frequency of 60 hz/ 100v /300W.
I applied voltage (x vol DC) to the mosfet bridge so that the output voltage was 100v AC.
I would like to ask you, can I get that external voltage of x vol DC from another transformer source? Of course, that DC source has enough current for a capacity of 300 W.
Hello Thieu, yes that’s definitely possible, you can use an external DC supply for the H-Bridge configuration, and the load.
I try to build 1kva low frequancy hbrige used sg3525 IC my problem is feedback
please see the link beloww…it shows how to configure the feedback to pin#1 of the IC from the output 220V of the inverter:
Hi guys!
How can I reset the EGS002?
Hi, what exactly do you want to reset? Egs002 is an oscillator based circuit, it does not have a memory or storage facility to be reset.
Hi, thanks for your reply.
I found the information below on the EG8010 datasheet and I want to know how I can do the hard reset as it is stated below as the EGS002 module I’m using is not coming on again.
Thanks.
“If overvoltage or undervoltage issue still exists, EG8010 will repeat the
process above every eight seconds. If EG8010 runs regularly for more than one minute, it will zero
the counter of overvoltage and undervoltage. However, if EG8010 does not function regularly after
five 8-second cycle, it will complete turn off the output of SPWM unit. It needs a hard reset to start
again.’
OK, got it…however currently I do not have any information regarding how to hard reset an egs002 module…let us know if you are able to find it.
Thank you.
What do I do if the LED keeps blinking thrice and going off again and again. Pin 15 (Vfb) is not connected to anything and yet I get overvoltage signalling. How can I remedy this?
Please connect pin#15 to ground and check again, if still the LED blinking does not stop then your board might be malfunctioning.
Mr swagatam, I’m following the project with egs002 module, and I’m interested about the totem pole driver for mosfets, do you have an available circuit? ,for 5A output
Hello Luis, i am not sure if a totem pole BJT driver can be used for the high side MOSFETs? I think it can’t be used for the high side MOSFETs.
Right,I’m thinking for increasing mosfets gate signal it may work
How will you increase gate voltage to EGS002 MOSFETs?
If the egs002 module indicate overcurrent with no load,what should I do.some egs002 work ok but some blink indicating overcurrent.sir,what should I do.thank you
If it is indicating over current without a load that means either your MOSFETs are shorted or has some fault or maybe the EGS002 itself is malfunctioning. Disconnect the drains of the MOSFETs and check again.
Hi,Mr swagatam,now I’m build a basic inverter using the egs002, like the circuit diagram above, and works perfectly ?, and when I use a 5kw transformer with same 60w fan as load,the mosfets irfp2907 blew up, not instantly, but after several minutes working, the question is can be the impedance of the transformer affect the mosfet?, there is no high temperature on mosfet, no bad frequency noise,every thing runs fine, until failure
Hi Luis, glad you could build the inverter design successfully.
Yes the transformer impedance can cause MOSFETs to get overloaded and blow, however that would also cause the MOSFETS to heat up first. In your case the MOSFETS are not heating up and we also have the overload current protection included in the design, so I don’t think it is the transformer impedance which is causing the issue. Possibly it could be he high frequency spikes responsible for this.
You can try adding reverse diodes across the drain, source of the MOSFETS, and see if that helps to solve the problem.
Ok thanks sir for the help!
Hi, i used EGS002 along with conventional UPS 6.5v Transformer to have pure sine inverter, but with loads heavier than 150w, the voltage drops from 200v to 180v. Any idea where to look at ? thanks. Feedback seems correct (always 3v at VFB pin)
If the output voltage is dropping then you may have to consider upgrading the battery, transformer and the MOSFETs, or whichever is below the required current and wattage specifications.
Thanks for your answer.
I run 12v under powerfull power supply, the transformer comes from a 500w UPS and i am using 3205 mosfets. Isn’t the problem coming from the feedback circuit ?
In that case you can temporarily disconnect the feedback and check the response, that will confirm if the feedback is responsible or not.
Thanks for this tip. Should i ground it or leave it floating.
Also, when lowering the voltage to 170v, it can power 100W without any voltage drop, the only thing is that VFB = 1v.
Did you try adjusting the 10k preset?
If you are not using the feedback, you can keep the pinout gounded.
Hello, i use the 10K preset to reach 220V without load, once loaded the same problem. Note that rectified DC voltage is 217VDC, and voltage at VFB is always 1V, not 3V as mentionned in the datasheet, and the EGS strangely doesn’t go into low voltage fault.
If your input DC is 217v at the MOSFET drains then the output should be much lower than 217v, in fact it should be 217/1.41=153v rms, isn’t it?
I was speaking about DC voltage at the rectification diodes in the feedback circuit. As said before, VFB pin sees only 1V when AC voltage is 220V and under load, AC voltage drops to 170V and VFB at 0.7V.
How come it doesn’t go into under voltage fault?
OK, what happens if the VFB connection is removed? What is the Amp rating of the power supply?
I am not fully aware of the under voltage cut off setting, is there any setting for this?
Hi,I recently searched for EGS032 three phase inverter module and that leads to this page, Mr swagatam can you explain about EGS032 module pinout?
Hi Luis,
I have not yet studied the EGS032 three phase inverter module, so cannot explain its pinouts at this moment, I will try to get more information about this module so that I can create a new article on this topic.
Ok, thanks sir
Please how do I shorten JP for it’s operation example i was told to shorten JP5 to get 50HZ frequency. please what does it mean on the EGS002 Board am using this board for the first time. help
I too can’t figure out what is JP5 in the EGS002? Never heard of this term.
If I need a 2000 watts inverter from this circuit, what type of mosfet is good for handling the power and what is the rating of transformer do I need to use?
Thanks very much
You can try adding the following MOSFET:
https://www.homemade-circuits.com/high-current-mosfet-irfp2907-for-wind/
As I can see in the circuts diagram, each mosfet is connected to a specific pin of the egs002 module.
My question is, if I need more than 4 mosfet where are they going to be connected?
Why do you want more than 4 number? Do you want to increase the power of the MOSFETs? In that case you can simply add the MOSFETS parallel to the existing ones.
Could this be used a sine function generator, instead of power?
I guess the sine output is PWM not sinusoidal.
Please sir, for 24v inverter can I use LM7805 instead of LM7812, or can I use both
Hi Soliu,
As given in the diagram, in place of 5V you will have to use 7805 and in place of 12V you will have to use 7812
Hello sir, I have successfully built a 3kva of this inverter. It’s working perfectly with no complain. My problem is how to use one low frequency transformer for both inverter and charger system. Is it possible, if yes, how?
Thank you Olusegun, I am glad you could build the design successfully. However, i am sorry, I have no idea how to convert the above design into a single transformer inverter/charger circuit.
Ok thanks
I used a 9v primarily transformer and irf460 mosfet , its a 20amps high voltage mosfet I tend to swap the input of the mosfet to 400v after succesful test. In the mean time I read a little above 9v output from mosfet to transformer, and 204v at the transformer output , I have not connected the output reference yet to correct the output,this is because I configured it as it is in the diagram above , the transformer is temporary. Ihope i provided enough information for clear understanding of the situation
Hello sir, thanks for these circuits you researched and made available for the use of all. I built this egs002 inverter circuit and it worked. I used a 12v 4s lifepo4 battery hence my power supply is usually 13v or above. Now the problem I encounter is that the circuit will run 2 seconds and off, the led on the egs002 will blink 4 time and ON the output again, this will keep recycling. The datasheet I found on the internet said this means under voltage condition. But 12.6v that gets to the chip is not supposed to be under voltage.( I get 12.6 because I put a diode at the input to protect the chip from mistaken polarity swap, but the problem is the same even when I removed the diode and power it directly) The diagram above showed +5, +12, +400. But On the general datasheet , you wrote +15 – +20. Can this be responsible for my difficulty? Any suggestions you provide to help me rectify this will be highly appreciated
Thank you Ugo for the detailed explanation.
I referred to the datasheet online and found the following information:
EGS002 driver board provides LED warning indication function. User can determine problem
according to the followings:
Normal：Lighting always on
Overcurrent：Blink twice, off for 2 seconds, and keep cycling
Overvoltage：Blink 3 times, off for 2 seconds, and keep cycling
Undervoltage：Blink 4 times, off for 2 seconds, and keep cycling
Overtemperature：Blink 5 times, off for 2 seconds, and keep cycling
Thanks for your response sir. The difficulty in my case is , my voltage is not low(13-13.2 ) almost always. But I get the 4 blink signal
Yes I understand, in that case it is difficult to diagnose the issue.
Yes, I want to use 24v
MOSFETs can be IRF540, and the transformer primary can be 0-12V
Hello sir, it’s me again, I’ve done with the 12v successfully, I want to use 24v battery. What mosfet can I use and the voltage of the transformer too. Thanks.
Olusegun, do you want to use 24V in place of 400 V in the EGS circuit??
Hie, thanks for this lecture. I made the inverter using the egs002 it’s working perfectly. I have a question, Have you ever tried to generate these pwm and spwm using Arduino uno or nano? If yes lead me to the post, if no please try it out for me.
Hi, thanks!
For Arduino based SPWM circuits you can refer to the following posts:
https://www.homemade-circuits.com/arduino-pure-sine-wave-inverter-circuit/
https://www.homemade-circuits.com/arduino-spwm-generator-circuit/
Now when I connected irfz44 , 8 pieces now the voltage is normal now. Thanks a lot.
Good to know the problem is solved.
Thanks for your quick response, I so much appreciate this about you.
I detected that I used different mosfets that are not of the same rating. They have different current and voltage rating. I might still get back to you soon.
OK, thanks for updating!