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.

Microcontroller (MCU): Often a specialized 8-bit chip, such as an ST7FLITE09 or S3F84B8, that generates Pulse Width Modulation (PWM) signals to control the heating power.

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4.1 Input EMI and Rectification

The diagram shows a common-mode choke (L1) followed by X and Y capacitors to reduce conducted emissions. A NTC thermistor limits inrush current. The bridge rectifier (often a KBU808 or similar) outputs a pulsating DC, smoothed by a large 150µF–470µF capacitor rated at 400V or 450V.

Induction Cooker Circuit Design | PDF | Mains Electricity - Scribd