Charging apparatus and current/voltage detector for use therein

Details Charging apparatus and current/voltage detector for use therein Charging apparatus and current/voltage detector for use therein

1996-12-02

1998-12-15

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With detection of current or voltage amplitude

320162, 320163, 320140, 320145, 323275, 323276, 323277, H02J 704, H02J 706

Patent

active

058501371

ABSTRACT:
A charging apparatus having a power supply circuit that provides a DC output current via a sense resistor. A current detector amplifies, detects and provides a voltage across the sense resistor. A controller designates the output of the current detector as a determination signal when the DC output current is equal to a preset voltage. Responsive to the determination signal, the controller generates a control signal in order to control the DC output current of the power supply circuit. More particularly, the current detector includes a first differential amplifier that amplifies and output the voltage across the sense resistor, a second differential amplifier amplifies and supplies a differential voltage between the output of the first differential amplifier and a predetermined first reference voltage, and a first output circuit responsive to the output of the second differential amplifier delivers the determination signal. The second differential amplifier includes a first clamp circuit provided between the first differential amplifier and the first output circuit to clamp the input to the second differential amplifier.

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