Reverse Engineering Isolated Gate Driver
Hi,
In this page I will talk about the reverse engineering process for the Isolated Gate Driver. This module was given to me by a friend. I suspect that this module came from UPS.
Introduction
The gate driver is a circuit that controls the Mosfet's gate and ensures that it will operate correctly in high frequency. This circuit offers the following features:
- Isolated open loop DC-DC converter power supply circuit to power the isolated section (This is useful for driving high side Mosfets).
- Controlling the Mosfet with isolated gate driver HCPL-3120.
These features keeps the microcontroller safe from high voltage.
Reverse Engineering Process
I have used a graphical tablet for this process and Microsoft Whiteboard, this made this process easy.
Top view for the DC-DC converter with its part number and turns ratio.
Image for the main components here is the gate driver board
Reverse engineering process for the top and bottom of the board
The schematic for the board
More Pictures
Top view for the gate driver board
Bottom view for the gate driver board
Top view for the DC-DC converter with its part number and turns ratio.
Image for the main components here is the gate driver board
Reverse engineering process for the top and bottom of the board
The schematic for the board
Component List
| Part Type | Part Name | Quantity | Notes |
|---|---|---|---|
| IC | HCPL-3120 | 1 | |
| Diode | BAT54S | 1 | |
| Transformer | 430-5010A
JTKIB-1PH1410 |
1 | Custom Made |
| Ceramic Capacitor | 100nF | 2 | |
| Ceramic Capacitor | 0.47uF | 2 | |
| Resistor | 470 Ohm 1206 Package | 1 | |
| Resistor | 2.2 Ohm 1206 Package | 1 | |
| Resistor | 10 Ohm 0805 Package | 1 | |
| Resistor | 5K Ohm 0805 Package | 1 | |
| Transistor NPN | FZ651 | 1 | |
| Transistor PNP | FZ660 | 1 |