| 摘要 |
PROBLEM TO BE SOLVED: To provide a simplified and inexpensive auxiliary power supply circuit with a reduced packaging space prepared for a power supply circuit. SOLUTION: An auxiliary power supply circuit is provided with an input voltage detection circuit 10 constituted by combining a transistor(TR) and a Zener diode, a voltage level generation circuit 11 connected to the collector side of a controlling TR to be driven by the circuit 10 and having a built-in Zener diode, and a feedback circuit 12 connected to the circuit 10 to obtain a hysteresis characteristic. |
