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Charge/discharge control circuit and battery device

A charge-discharge control, charge-discharge technology, applied to battery circuit devices, circuit devices, electric controllers, etc., can solve problems such as manufacturing tolerances

Active Publication Date: 2010-04-07
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to manufacturing tolerances when mass-producing charge-discharge control circuits, the overcharge detection voltage of a certain charge-discharge control circuit may be lower than the detection voltage during the cell balance period.

Method used

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  • Charge/discharge control circuit and battery device
  • Charge/discharge control circuit and battery device
  • Charge/discharge control circuit and battery device

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0019] First, the structure of the battery device will be described. figure 1 is a block diagram showing a battery device.

[0020] The battery device includes a charge and discharge control circuit 10 , an NMOS transistor (a switch for cell balance (cell balance) control) 11 , a resistor 12 , and a battery 13 . The battery device includes a charge and discharge control circuit 20 , an NMOS transistor (switch for cell balance control) 21 , a resistor 22 , and a battery 23 . The battery device includes a charge and discharge control circuit 30 , an NMOS transistor (switch for cell balance control) 31 , a resistor 32 , a battery 33 , and a capacitor 34 . The battery device includes a PNP bipolar transistor 40 , a PNP bipolar transistor 50 , an NMOS transistor (switch for charging stop) 60 , an NMOS transistor (switch for stopping discharge) 70 , a resistor 80 , and a re...

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PUM

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Abstract

The invention provides a charge / discharge control circuit which can well prevent the undercharge of batteries and a battery device. Even if the overcharge detection voltage of a certain charge / discharge control circuit is below the detection voltage of an electric quantity balancing (electric quantity balancing) period because of a fabrication tolerance generated when charge / discharge control circuits (10) are produced in mass, the detection of the electric quantity balancing period is also carried out before the charge stop of each battery. Namely, after electric quantity balancing control, the charge of each battery is stopped. Thus, the undercharge of each battery can be well prevented.

Description

technical field [0001] The present invention relates to a charge and discharge control circuit and a battery device for controlling charge and discharge of a battery. Background technique [0002] Nowadays, various portable electronic devices are popularized. [0003] The portable electronic device includes a battery device that supplies a power supply voltage to the portable electronic device, and the battery device includes a battery and a charge-discharge control circuit that controls charge and discharge of the battery. [0004] In the charge and discharge control circuit, when the battery is charged, the battery voltage of the battery becomes high, and the battery voltage is higher than the overcharge detection voltage, then the overcharge state of the battery is detected. Then, control to stop charging is performed. When the battery is charged, the battery voltage of the battery becomes high, and the battery voltage is higher than the detection voltage of the cell ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44G05B11/32H02J7/02
CPCY02E60/12H02J7/0016Y02E60/10H01M10/441H02J7/0031H02J7/00302
Inventor 川名宗治樱井敦司佐野和亮小池智幸田家良久
Owner SII SEMICONDUCTOR CORP
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