MC34063 charging voltage converter circuit
description:
The voltage of three lithium batteries connected in series is about 12V. To charge them, use a 12.6V charger, which is not easy to buy. The 12V power supply is easy to find, such as monitor power. The circuit shown in the figure can convert the 12V power supply to 12.6V and then charge the lithium battery. The converter is provided with a charging indicator that indicates both "charging" and "charging full" states.
U1 is a commonly used DC power conversion integrated circuit. It boosts the 12V power supply and outputs 12.6V voltage through R5 and D2. Q1 is a switch tube for detecting the state of charge, and LED1 and LED2 are green and red indicators, respectively. When charging, due to the charging current, a voltage drop occurs on R5, Q1 is turned on, and red LED 2 is lit. When fully charged, the overcharge protection on the protective plate inside the lithium battery cuts off the current, the red LED 2 is off, and the green LED 1 is on.
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