Hi friends, welcome back. We are going to build a simple and effective IGBT and mosfet tester using just a few basic components. This tester will help us to check if our IGBT or MOSFET is working properly or not. Also, we can measure the gate voltage of both components.
IGBT and MOSFET Tester Circuit Diagram
Components Required
| Component | Quantity | Description |
|---|---|---|
| 9V DC Power Supply | 1 | Provides power to the circuit |
| SPDT Switch | 1 | Used for switching the circuit |
| Push Button | 1 | Momentary switch for control |
| Red LED | 1 | Indicates a specific state |
| Green LED | 1 | Indicates another state |
| 220Ω Resistor | 1 | Limits current for LEDs |
| 1KΩ Resistor | 1 | Pull down resistor for MOSFET/IGBT |
| 10KΩ Resistor | 1 | Pull down resistor for MOSFET/IGBT |
| MOSFET (N-Channel) | 1 | Used for switching applications |
| IGBT (Insulated-Gate Bipolar Transistor) | 1 | Used for high-power switching |
| Terminal Blocks | 2 | Connects external wiring |
Working Principle of IGBT or Mosfet Tester
Now let’s understand how this tester works. Here is how our tester works. We connect IGBT or MOSFET to the circuit using a dedicated connector. When we press the push button, we begin controlling the gate voltage with a potentiometer as we slowly increase the gate voltage, the transistor begins to turn on when the MOSFET or IGBT starts conducting slightly.
The green LED will glow. The red LED remains on As we continue increasing the voltage. The transistor fully turns on the green LED) brightly, and the red LED turns off. if the IGBT or mosfet is short, the green LED will turn on fully right away, even with no voltage at the gate, and the red LED will stay. This indicates a faulty component.
To build this tester we will need these components. Digital will be there to measure gate voltage red and green LED For visual indication potentiometer to control gate voltage one and 1N4148 diode a Pushp button 10uf micro capacitor two 220ohms resistor 2.2k resistor 10k resistor 2 pin terminal block three terminal block three female (Pin) header.
