![]() ![]() ![]() A further feature is an a-c interrupt feature which senses the disconnection or interruption of a-c power from the power circuit, latches the a-c power turn off control in its off condition, interrupts the voltage following and timing charge control and maintains it in readiness for resumption of the charging cycle, at the interrupted point in the cycle, after the a-c power has been = ,Ī power supply is described for charging a storage battery which consists of: power supply means adapted to be connected to a source of electrical energy for supply power rectifying means operatively connected to the power supply means for rectifying the supplied power output transformer means operatively connected to the rectifying means and to the battery for transforming the rectified power power switching means operatively connected to the output transformer means for controlling a flow of current from the rectifying means through the output transformer means pulse width modulator means operatively connected to the power switching means for controlling the more » power switching means, with a coupling transformer interposed between the pulse width modulator means and the power switching means current sensing means for sensing the flow of current through the output transformer means current limiting means responsive to the current sensing means and operatively connected to the pulse width modulator means for controlling the pulse width modulator means charging voltage control means responsive to the current sensing means and operatively connected to the pulse width modulator means for controlling the pulse width modulator means latch means for stopping the pulse width modulator means operatively connected to the pulse width modulator means overcurrent sensing means responsive to the current sensing means operatively connected to the latch means for controlling the latch means means for sensing the absense of the storage battery operatively connected to the latch means for controlling the latch means and end-of-charge sensing means operatively connected to a terminal of the battery and to the latch means for controlling the latch means responsive to a predetermined voltage present at the terminal. The control circuit portion of the charger has a d-c disconnect feature which senses the interruption in the electrical circuit between the charger's terminals and the battery, said disconnect feature causing the operation of the a-c power switching device to disconnect the a-c power from the power circuit after the terminals have been disconnected. A battery charger has a control circuit portion and a power circuit portion with common terminals to connect to a battery desired to be recharged, the power circuit includes a transformer and rectifier to deliver at least partially rectified a-c current to the battery, and an a-c power connection through which a-c power is supplied to the power circuit with the control circuit having a solid state switch to selectively connect the a-c power to the power circuit portion.
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