| 摘要 |
PURPOSE: A power supply circuit is provided to supply a minimum power needed at a wait mode of a microcomputer by adding a power adjustor at a secondary part for changing a load resistance value according to a control of the microcomputer so that it can simplify a circuit arrangement. CONSTITUTION: The circuit comprises a power stabilizer(7), load resistors(R1, R2), and a power adjustor(8). The power stabilizer(7) receives a power from a power controller, and makes the power stable. The load resistors(R1, R2), serially connected, supplies the stable power to the microcomputer(2). The power adjustor(8) lowers the power output via the resistors(R1, R2) according to the control of the microcomputer(2), and supplies the lowered power to the microcomputer(2). The power adjustor(8) includes a resistor(R3), connected parallel with the load resistor(R1), and a PNP bipolar transistor(Q1).
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