SCR automatic constant current charger circuit

Published:2011/5/24 2:31:00 Author:John | Keyword: automatic constant current charger | From:SeekIC

Principle of the circuit is shown in the figure. When it starts to charge, the voltage on two ends of the battery is low. Such is not enough to turn the transistor VT on. Phase-shift circuit formed by RC is to provide trigger current for SCR. The angle of phase-shift is determined by the RP2. SCR deadlines at negative half-cycle moment. Therefore, SCR charges by utilizing the half-wave silicon controlled rectifier to the battery generator. RP2 can be adjusted to adjust the charge current. The maximum charge current is set by R1. Indicating light is string in the circuit to indicate charging status and charge current. R3 is to adjust the brightness of light.



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