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555 storage battery protector circuit with stable voltage ch

2015-02-06 22:07  
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As shown in the figure 10-22, the protector circuit is composed of two three-terminal voltage stablizing units and two 555, it includes charge protection and discharge protection. It has the functions of overcharge protection, steady voltage charge, over-discharge protection and short circuit protection. The charge protection circuit is made of IC1(555)and 7812, 7815 three-terminal regulators. 7812 provides 555 circuit with stable +12V voltage. When it is just charging, the storage battery is charged by J1-1 normally-closed contact.