JPS621431U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing an embodiment of the load power supply circuit according to the present invention, Fig. 2 is a load current characteristic diagram of the same circuit, and Fig. 3 is an electric circuit diagram showing a conventional load power supply circuit. FIG. 4 is a characteristic diagram of the load current of the conventional circuit same as above. 11: detection switch, 13: first transistor, 14: charging/discharging capacitor, 16: second transistor, 17: load, 18: third transistor.

Claims (1)

[Claims for Utility Model Registration] A detection switch, a first transistor that is turned on in response to supply of power supply voltage when the detection switch is turned on, and a transistor located between the power supply and a load that turns on the first transistor. a second transistor that supplies a load current from the power supply to the load in response to conduction, and a second transistor that is located between the detection switch and the base of the first transistor, and is instantaneously charged when the detection switch is turned on. a time constant circuit including a capacitor that is operated and starts discharging via the first transistor when the detection switch is turned off; and a time constant circuit whose base is connected between the first and second transistors, and a third transistor for discharging the charging voltage of the capacitor of the circuit, and as the conduction resistance of the first transistor increases as the capacitor discharges, the third transistor is turned on and the capacitor is discharged from the capacitor. A load power supply circuit characterized in that the load power supply circuit is configured to rapidly complete discharging through the transistor No. 3.