| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce stress on a microcomputer by connecting the output terminals of a constant voltage circuit which supplies a DC voltage converted from a commercial AC voltage via a diode to the microcomputer. SOLUTION: After the commercial AC voltage is decreased by a transistor T and rectified by a diode bridge DB, the DC voltage smoothed by a smoothing capacitor C1 is supplied to the microcomputer CNT via the diode D1 and the constant voltage circuit Reg1. While, a power supply voltage is supplied to a peripheral circuit equipped with the operating switch SW of an electric apparatus via the constant voltage circuit Reg2, and also, the output voltage of the constant voltage circuit Reg2 is fetched in the microcomputer CNT via the operating switch SW. Moreover, the output terminals of the constant voltage circuits Reg1, Reg2 via the diode D2, and the power source is stably supplied to the microcomputer CNT even when difference occurs in the output voltages of the constant voltage circuits Reg1 and Reg2.</p> |
