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US 5,850,137 AGranted
Charging apparatus and current/voltage detector for use therein
AssigneeFujitsu Limited
InventorsKyuichi Takimoto, Takashi Matsumoto, Yoshiaki Sano
Life of this patent
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AssigneeFujitsu Limited
InventorsKyuichi Takimoto, Takashi Matsumoto, Yoshiaki Sano
Estimating the term…
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.
A charging apparatus including a power supply circuit for providing a DC output current via a sense resistor, a current detector for amplifying, detecting and providing a voltage across the sense resistor, and a controller for designating the output of the current detector as a determination signal when the DC output current is equal to a preset current and responsive to the determination signal for generating a control signal in order to control the DC output current of the power supply circuit, the current detector of the charging apparatus comprising:
A charging apparatus including a power supply circuit for providing a DC output current via a sense resistor, a current detector for amplifying, detecting and outputting a voltage across the sense resistor, a voltage detector for amplifying and detecting a DC output voltage of the power supply circuit, and a control circuit for designating the output of the current detector as a determination signal when the DC output current is equal to a preset current, and for designating the output of the voltage detector as the determination signal when the DC output voltage is equal to the output of the voltage detector, wherein the control circuit generates a control signal responsive to the designated determination signal for controlling the DC output current and DC output voltage of the power supply circuit, said current detector including:
A charging apparatus including a power supply circuit for providing a DC output current via a sense resistor, a current detector for amplifying, detecting and outputting a voltage across the sense resistor, a voltage detector for amplifying and detecting a DC output voltage of the power supply circuit, and a control circuit for designating the output of the current detector as a determination signal when the DC output current is equal to a preset current, and for designating the output of the voltage detector as the determination signal when the DC output voltage is equal to the output of the voltage detector, wherein the control circuit generates a control signal responsive to the designated determination signal for controlling the DC output current and the DC output voltage of the power supply circuit, said current detector including:
A charging apparatus including a voltage detector for amplifying and detecting a DC output voltage of a power supply circuit and a control circuit for designating the output of the voltage detector as a determination signal when the DC output voltage is equal to a preset voltage, wherein the control circuit generates a control signal responsive to the designated determination signal for controlling the DC output voltage of the power supply circuit, the voltage detector of the charging apparatus comprising:
A current detector comprising:
A voltage detector comprising:
Dependencies are inferred from the claim text.