Automatic charging apparatus

• US 5,477,128 A
• Filed: 06/01/1994
• Issued: 12/19/1995
• Est. Priority Date: 07/30/1993
• Status: Expired due to Fees

• Current Assignee: Technical Associate Co., Ltd.
• Original Assignee: Technical Associates Co., Ltd.
• Inventors: Yamada, Yasuharu, Iizuka, Souichi, Kuhara, Sohei
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): TSO, EDWARD H
• Application Number:
  US08/252,415
• Time in Patent Office: 566 Days
• Field of Search: 320/20, 320/21, 320/27, 320/28, 320/30, 320/39, 320/40, 320/49, 320/54, 363/25, 363/26, 363/27, 363/85-87
• US Class Current: 320/163
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
• CPC Class Codes: Y10S 320/27 Transformerless

Abstract

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.

Claims

1. An automatic charging apparatus comprising:

a rectifier 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 in accordance with the voltage of said battery;

a current setting resistor for setting the charging current of said battery; and

a current control circuit which obtains the charging current best suited to said battery by controlling the pulse width of base current flowing in a transistor connected to the outputs of said thyristors.