Electricity: battery or capacitor charging or discharging – Diverse charging or discharging rates for plural batteries
Reexamination Certificate
2001-10-19
2003-04-22
Tso, Edward H. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Diverse charging or discharging rates for plural batteries
Reexamination Certificate
active
06552514
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a charging device with a multiple stage or “multi-step” voltage charging source, and more particularly to one that has a (dis)chargeable storage device on a load side that is charged by the multi-step charging source up to a preset voltage, after which the charging status is maintained by means of a smaller charging current supplied by a stage of the charging source with higher voltage, or the charging current is cut off by (i) operating a primary control switch connected in series with the charging circuit, or (ii) turning the primary switch connected in series with a charging circuit to an open circuit condition to thereby cut off charging of the (dis)chargeable storage device.
(b) Description of the Prior Art
A conventional single step voltage charging source usually requires an analog resistance device known to have high thermal loss for regulating and controlling output voltage and current, or a pulse-width-modulation (PWM) device known to generate higher electromagnetic interference (EMI) noise to regulate and control the output voltage and current. The charging device of the multi-step voltage charging source of the present invention, on the other hand, simultaneously reduces thermal loss and EMI noise level.
SUMMARY OF THE INVENTION
The primary purpose of the present invention is to provide a charging device with a multi-step voltage charging source that has a (dis)chargeable storage device on a load side to be charged by the multi-step charging source up to preset voltage, after which the charging status is maintained by a smaller charging current supplied by a stage of the charging source with higher voltage, or the charging current is cut off by operating a primary control switch connected in series with a charging circuit, or by turning the primary switch connected in series with a charging circuit to open circuit, thus cutting off charging of the (dis)chargeable storage device.
REFERENCES:
patent: 4949028 (1990-08-01), Brune
patent: 5013991 (1991-05-01), Brune
patent: 5541492 (1996-07-01), Fernandez et al.
patent: 5900717 (1999-05-01), Lee
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