12_V_AT_8_A

Published:2009/6/29 21:08:00 Author:May | From:SeekIC

Charging circuit for lead-acid storage batteries is not damaged by short-circuits or by connecting with wrong battery polarity. Battery provides currentfor charging C1 in PUT relaxation oscillator. When PUT is fired by C1, SCR is turned on and applies charging current to battery. Battery voltage increases slightly during charge, increasing peak point voltage of PUT and making C1 charge to slightly higher voltage. When C1 vo!tage reaches that of zener D1, oscillator stops and charging ceases. R2 sets 12 V maximum battery voltage between 10 and 14 V during charge.-R. J. Haver and B. C. Shiner, Theory, Characteristics and Applications of the Programmable Unijunction Transistor, Moto-rola, Phoenix, AZ, 1974,AN-527, p 10.



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