Power supply system for an apparatus with rechargeable batteries

Details Power supply system for an apparatus with rechargeable batteries Power supply system for an apparatus with rechargeable batteries

1997-06-17

1999-01-12

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320114, H01M 1046

Patent

active

058595244

ABSTRACT:
A power supply system for an apparatus (SVR) with a rechargeable battery (B) has its power supply unit (PSU) coupled to the apparatus (SVR) by a two-wire connection (PSA/SVA; PSB/SVB). The power supply unit (PSU) having a flyback converter (DCC) with a transformer (TR) which supplies the battery (B) with charging current. The converter (DCC) is stopped periodically during breaks in which the apparatus (SVR) applies a status signal (STS) to the power supply unit via the two-wire connection. The power supply unit detects the status signal by means of a status detector (STD) and depending on the meaning of the status signal it switches the converter to another value of the charging current. When the battery (B) is full, which is detected by a battery management unit (BMU), or when the charging current is too large, which is detected by a comparator (CMP) and a current-sensing resistor (R2), it is thus possible to switch from fast charging to trickle charging. By way of status signal the apparatus (SVR) supplies a voltage pulse to an auxiliary winding (Ls2) of the transformer (TR) by temporarily short-circuiting a rectifier diode (D5) in the secondary circuit by a switching transistor (T) during the current supply breaks.

REFERENCES:
patent: 4775827 (1988-10-01), Ijntema et al.
patent: 4910654 (1990-03-01), Forge
patent: 5206097 (1993-04-01), Burns et al.
patent: 5254931 (1993-10-01), Martensson

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