Battery charger and control method therefor

• US 7,432,685 B2
• Filed: 06/07/2007
• Issued: 10/07/2008
• Est. Priority Date: 02/25/2003
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hayashi, Isao
• Primary Examiner(s): TSO, EDWARD H
• Application Number:
  US11/759,738
• Publication Number:
  US 20070229037A1
• Time in Patent Office: 488 Days
• Field of Search: 320/118, 320/128, 320/135, 320/136, 320/132, 320/152, 363/23, 363/26
• US Class Current: 320/128
• CPC Class Codes: H02J 2207/40 adapted for charging from various sources, e.g. AC, DC or multivoltage
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

To fully charge a battery by a multi-power-source battery charger either when a DC power having a voltage corresponding to the charging voltage of the battery is input or when a DC power having a voltage higher than the charging voltage of the battery is input, the supply destination of the input DC power is switched, in accordance with the voltage of the DC power input to the battery charger, between a controller which controls charging of the battery in accordance with the charging voltage of the battery and a DC/DC converter which controls the voltage and current of the DC power supplied to the battery through the controller.

Claims

1. A battery charger for charging a battery, comprising:

a first input unit configured to input first direct current power having a voltage higher than a charging voltage of the battery;

a converter configured to convert the first direct current power into direct current power having a voltage different from the voltage of the first direct current power, and to output the converted direct current power to the battery;

a second input unit configured to input second direct current power having a voltage lower than the charging voltage, and to output the second direct current power to the battery;

a connection detector configured to detect a connection state between a plug and said second input unit; and

a charging controller configured to set a quick charging start voltage of the battery when connection between the plug and said second input unit is detected by said connection detector, wherein the quick charging start voltage is higher than the charging voltage set in the connection is not detected by said connection detector.

2. A control method of a battery charger having a first input unit that inputs first direct current power having a voltage higher than a charging voltage of a battery, a converter that converts the first direct current power into direct current power having a voltage different from the voltage of the first direct current power and outputs the converted direct current power to the battery, and a second input unit that inputs second direct current power having a voltage lower than the charging voltage and outputs the second direct current power to the battery, the method comprising:

detecting a connection state between a plug and the second input unit; and

setting a quick charging start voltage of the battery when connection between the plug and the second input unit is detected, wherein the quick charging start voltage is higher than the charging voltage set in the connection is not detected.