JPH037624U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the electric circuit of a battery charger according to the present invention, and FIG. 2 is a circuit diagram showing another embodiment. 3...Protection circuit, 4...LED, 5...LED
Operating circuit, 6...first transistor, 7...second
Transistor, 8...first diode, 9...second diode, 13...third diode, 14...
...Fourth diode, 15...Third transistor.

Claims (1)

[Claims for Utility Model Registration] In a battery charger that rectifies an AC power source to convert it into DC and charges a battery with the DC, first and second transistors 6, 7, first and second diodes 8, 9, In a normal positive/negative connection state, a current flows through the first diode 8 to form a normal route that turns on the first and second transistors 6, 7, and in a reverse positive/negative connection state, the current flows through the first diode 8 to turn on the first and second transistors 6, 7. a protection circuit 3 that forms an abnormal route that changes the voltage at the anode point of the diode 9 to turn off the first and second transistors 6 and 7 and outputs only the starting current of the second diode 9; It includes fourth diodes 13, 14, an LED 4, and a third transistor 15, and in a normal positive/negative connection state, the third transistor 15 is turned on due to the voltage drop in the forward direction of the third diode 13, and the third transistor 15 is turned on from the LED 4 to the third transistor 15. 4 diodes 1
4, and forms a non-lighting route in which the voltage at the anode point of the third diode 13 becomes 0 V in the reverse connection state of positive and negative.
A battery charger comprising: an operating circuit 5;