Back to results
US 5,477,128 AGranted
Automatic charging apparatus
AssigneeTechnical Associates Co., Ltd.
InventorsSouichi Iizuka, Yasuharu Yamada, Sohei Kuhara
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeTechnical Associates Co., Ltd.
InventorsSouichi Iizuka, Yasuharu Yamada, Sohei Kuhara
Estimating the term…
An automatic charging apparatus comprises a rectifier circuit composed of a plurality of diodes and thyristors, said diodes and thyristors being arranged in a bridge connection, a phase control circuit for obtaining the charging voltage of a battery by controlling the phase of said thyristors, a voltage setting resistor for setting a charging voltage suitable for the state of said battery, a current setting resistor for setting a charging current suitable for the state of said battery and a current control circuit which obtains the charging current best suited to the state of the battery by controlling the pulse width of base current flowing in a transistor connected to the outputs of said thyristors. As a result, it is possible to efficiently charge the battery with charging voltage and current best suited to the state of the battery even if the battery is of large capacity.
An automatic charging apparatus comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
Regulation of charging or discharging current or voltage: in response to battery voltage
Technologies aiming at improving the efficiency of home appliances
Electricity: battery or capacitor charging or discharging: transformerless
Power supply and charging
Term ended 1 Jun 2014 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to an automatic charging apparatus employing a transformerless system which can be made small and light.
2. Description and Problems of the Related Art
FIG. 1 is a circuit diagram of an automatic charging apparatus according to an embodiment of the present invention;
FIG. 2 is a detailed circuit diagram of a voltage control circuit and a current control circuit which constitute the automatic charging apparatus according to the embodiment of the present invention;
FIGS. 3 (a) to 3 (g) are waveform diagrams respectively showing waveforms at the portions of the voltage control circuit and the current control circuit which constitute the automatic charging apparatus according to the embodiment of the present invention.
An embodiment of the present invention will be described in detail with reference to drawings hereinafter.
FIG. 1 is a circuit diagram of the automatic charging apparatus, FIG. 2 is a detailed circuit diagram of a voltage control circuit and a current control circuit which constitute the automatic charging apparatus and FIG. 3 is a waveform diagram showing waveforms of signals at the portions of the voltage control circuit and the current control circuit.
In FIGS. 1 and 2, denoted at I is a voltage control circuit for setting a voltage in accordance with that of a battery 3 to be charged with electricity and 2 is a current control circuit for controlling a charging current.