Battery voltage equalizer circuit

Details Battery voltage equalizer circuit Battery voltage equalizer circuit

1994-11-29

1996-06-18

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 17, H01M 1044, H01M 1046

Patent

active

055281222

ABSTRACT:
A battery equalizer for equalizing the voltage on series connected batteries synchronously switches the opposite ends of a tapped autotransformer in alternately reversing connection to the distally opposite terminals of the battery by alternately turning transistor switches on and off in alternate pairs while maintaining a center tap of the autotransformer connected to an intermediate terminal of the series batteries. Switching is accomplished by power field effect transistors and a voltage converter converts the upper battery voltage to a floating voltage so that the voltages of the two batteries can be differenced. The differenced voltage provides an error signal for driving a pulse width modulator which switches the transistors. Two protective power switching field effect transistors are interposed in the circuit and connected to prevent damage to the circuitry in the event of misconnection.

REFERENCES:
patent: 4479083 (1984-10-01), Sullivan
patent: 4502000 (1985-02-01), Mashikian
patent: 4502001 (1985-02-01), Galloway
patent: 4949028 (1990-08-01), Brunz
patent: 4967136 (1990-10-01), Nofzinger

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