:Mains AC (typically 220V) enters through a fuse and an EMI filter. It is then converted to DC by a high-current Bridge Rectifier . This DC voltage is filtered by a large capacitor (often 5µF) to provide a stable bus for the induction coil.
The PWM IC needs a small initial voltage to start switching. This is usually supplied via high-value "startup resistors" connected directly to the 300V rail. Locate the VCC pin of the PWM IC on your diagram.
It also handles ; if no magnetic pan is detected, the MCU stops the IGBT switching to prevent damage. Common Troubleshooting Tips chk-v9.04g circuit diagram
The driver transistor or MOSFET responsible for that relay is likely damaged.
[ AC Power Input: 220V AC ] │ ▼ [ Input Protection & EMI Filter ] (Fuse, Varistor, LC Filter) │ ┌────────────┴────────────┐ ▼ ▼ [ Low-Voltage SMPS ] [ Bridge Rectifier ] (18V Fan / 5V MCU) │ │ ▼ │ [ DC Bus Filter ] (310V DC) │ │ │ ▼ │ [ LC Resonant Tank ] (Heating Coil) │ │ └───► [ IGBT Driver ] ───►│ (High-Speed Switching) ▲ │ │ ▼ [ Microcontroller ]◄─┘ (Feedback Loops) 1. Input Protection and EMI Filtering Stage :Mains AC (typically 220V) enters through a fuse
A heavy-duty 10A to 15A ceramic fuse stands at the high voltage line entry point to interrupt current during short-circuits.
Induction Cooker Circuit Design | PDF | Mains Electricity - Scribd The PWM IC needs a small initial voltage to start switching
If you are troubleshooting a CHK-V9.04G board, check these components first: Usually shorts out, causing the main fuse to blow. Bridge Rectifier: Often fails alongside the IGBT. Resonant Capacitor: