or portable induction stoves. While a single official manufacturer PDF is rarely available publicly, these boards follow a standardized design architecture. Common Circuit Blocks
Placed across the AC lines to absorb sudden high-voltage line surges.
Clean old thermal paste off the IGBT and sensor. Reapply high-quality silicone thermal compound. Verify the 18V cooling fan spins freely under manual rotation. Defective IGBT Gate Driver Circuit or corrupt MCU. chk-v9.04g circuit diagram
Small-signal transistors (such as the MMBT2222A) or dedicated driver ICs step up the MCU’s logic pins to fully saturate the gates of the output switches.
The heavy lifting is performed by an Insulated Gate Bipolar Transistor (commonly parts like H20R1203 , FGA25N120 , or equivalent rated at 20A–25A, 1200V). The IGBT rapidly pulses the LC tank at ultrasonic frequencies (typically 20 kHz to 35 kHz), generating the alternating magnetic field required for induction. Low-Voltage Auxiliary Power Supply (SMPS) or portable induction stoves
Main Fuse blown, shorted Bridge Rectifier, or fried Auxiliary SMPS IC.
If the fuse is intact, measure voltage across the 5µF DC bus capacitor (). You should read ~310V DC. Clean old thermal paste off the IGBT and sensor
1. Input Protection & Electromagnetic Interference (EMI) Filter