The CHK-V9.04G control board, common in budget induction cookers, follows a standard architecture featuring a 10A-15A input fuse, a bridge rectifier, a 0.27µF–0.33µF resonant capacitor, and an FGA25N120-type IGBT

The CHK-V9.04G circuit board is a common, standardized mainboard used in many budget-friendly induction cooktops (often referred to as "China-common" PCB designs). If you are looking at this diagram, you are likely either repairing a dead unit or trying to understand the power delivery of an induction heater.

CHK-V9.04G is a widely recognized control board primarily used in induction cookers

But 300 volts was too much for the delicate "brain"—the Microcontroller (MCU). To protect it, the SMPS (Switching Mode Power Supply) section stepped in. Through a tiny transformer and a series of rapid pulses, it stepped the energy down to a gentle 5V and 18V. The 5V woke up the MCU, which immediately began scanning the Thermal Sensors like a sentry, ensuring the kitchen wouldn't go up in flames.