Chk-v9.04g Circuit Diagram New!

But 300 volts was too much for the delicate "brain"—the . 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.

The diagram reveals an auxiliary winding on the transformer that powers the PWM controller after startup. A startup resistor (typically 150kΩ – 470kΩ, 2W) from the bulk capacitor initially charges the VCC capacitor. If this resistor fails open, the board will "click" repeatedly as the IC tries to start and fails. chk-v9.04g circuit diagram