POWER SUPPLY AND DRIVING CIRCUIT OF HOUSEHOLD ELECTRIC APPLIANCES

摘要

PURPOSE: A power supply and driving circuit of household electric appliances is provided to remove a transformer by providing a power supply to a microcomputer by using an SMPS circuit. CONSTITUTION: A power supply noise filter(101) filters and removes a noise included in a power supply during supplying the power supply. A load noise filter(102) is connected between the power supply noise filter(101) and a load and removes a noise generated from the load. A power supply rectifier(104) receives and rectifies a power supply from the power supply noise filter(101) to a direct current voltage. An SMPS section(105) receives the direct current voltage from the power supply rectifier(104) and provides a voltage to a microcomputer(108). A low frequency noise filter(103) removes a low frequency noise from SMPS section(105). A power supply separator(106) isolates a power supply from power supply rectifier(104) and provides it to a next stage. A pulse duty generator(107) detects a zero point of the power supply from power supply separator(106) and outputs a pulse duty to microcomputer(108).