| 摘要 |
PURPOSE: A control circuit of a microwave oven is provided to reduce largely the number of elements and the total size of a PCB(Printed Circuit Board) by forming plural circuits with one chip. CONSTITUTION: A control circuit of a microwave oven includes an interrupt circuit, a constant potential circuit, a sound control unit, a fan motor control unit, an HVT control unit, and a door sensing unit. The interrupt circuit(1) receives AC voltage from an LVT(Low Voltage Transformer) and generates the AC power of 60Hz to a micro computer. The constant potential circuit(2) receives the DC voltage of the first rectifier and generates the constant voltage 5V. The sound control unit(3) controls a sound output according to a control command of the micro computer. The fan motor control unit(4) controls a driving operation of a fan motor according to a control command of the micro computer. The HVT control unit(5) controls an HVT(High Voltage Transformer) according to a control command of the micro computer. The door sensing unit(6) detects an opening state and a shutting state of a door.
|
