Power circuit circuit diagram: multi-function charger

MOS power IC full range

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

Photocoupler

Overview:

The multi-function charger introduced in this example has the characteristics of simple circuit and convenient use. It can charge nickel-plated batteries, nickel-hydrogen batteries and lead-acid batteries of 1·2-12V, and can also be used as small appliances (such as Walkman, etc.). ) work power.

Circuit working principle: The multi-function charger circuit is composed of a voltage conversion circuit and a voltage regulation adjustment circuit. The voltage conversion circuit is composed of a power switch S1, a voltage selection switch S2, a fuse FUl, a power transformer T, a rectifier bridge stack UR and a filter capacitor C. composition. The voltage regulation adjustment circuit is composed of a three-terminal voltage regulator integrated circuit IC, a resistor R, a potentiometer RP and a power supply adjustment tube V. Turn on Sl, AC 220V voltage after T step-down, UR rectification, C filter and IC, V and other voltage regulation adjustment, generate a stable DC voltage, output from the emitter of V. Adjust the resistance of the RP to change the output voltage and output current. When charging the battery above 6V, S2 should be placed in the "2OV" file; when charging the battery below 6V, the 2 should be placed in the "l5V" file. The component selection R selects the 1/2W metal film resistor. RP uses a synthetic membrane potentiometer. C selects the rectifier bridge stack with a withstand voltage of 5OV. V selects 3DDl5D silicon NPN low frequency high power transistor. The IC uses the LM7805 type one-end voltage regulator integrated circuit. T selects 8-1OW, the secondary voltage is l5V and 2OV power transformer. The PA uses a 0-2A ammeter. PV selects 0-25V DC voltmeter.