Power supply circuit

Details Power supply circuit Power supply circuit

1986-03-28

1987-08-04

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 32, 363 19, 30DIG1, H02J 710, H02M 3335

Patent

active

046848711

ABSTRACT:
A self-oscillating power supply circuit for charging a battery in which energy is stored in a transformer (Tr) during the so-called forward intervals. This energy is applied as a charge current to the battery (6) during the flyback intervals. To prevent overcharge of the battery, the circuit includes a battery voltage protection circuit (10) receiving its power supply from the battery. A fraction of the battery voltage is applied to this circuit by means of a voltage divider (R.sub.3, R.sub.4) connected across the battery by means of a switch (S.sub.1) during the flyback intervals. To prevent the voltage drop across the internal resistance of the battery from influencing the measurement of the battery voltage, the battery voltage is measured after the end of a flyback interval and before the commencment of the next forward interval. This is achieved by short-circuiting the inputs (11, 12) of the protection circuit (10) by means of two diodes (D.sub.1, D.sub.2) during the flyback intervals.

REFERENCES:
patent: 3531706 (1970-09-01), Mullersman
patent: 4187536 (1980-02-01), Govaert et al.
patent: 4376263 (1983-03-01), Pittroff et al.
patent: 4504775 (1985-03-01), Becker

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