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Charge and discharge control circuit and battery device

一种充放电控制、充放电的技术，应用在电池电路装置、电路装置、紧急保护电路装置等方向，达到防止电压上升、提高安全性的效果

Inactive Publication Date: 2014-09-03
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional charge and discharge control circuit and battery device, there is a problem that current flows from the VM terminal 115 to the VDD terminal 111 through the parasitic diode after the reverse connection of the charger is detected and the discharge of the secondary battery is stopped.

Method used

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

Examples

Experimental program
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Effect test

no. 1 approach

[0022] figure 1 It is a circuit diagram of the charge and discharge control circuit and the battery device of the first embodiment.

[0023] The charge and discharge control circuit and the battery device of the first embodiment are composed of a secondary battery 101, resistors 102, 104, a capacitor 103, a discharge control NchFET transistor 107, a charge control NchFET transistor 108, a charge and discharge control circuit 100, and an external terminal 120, 121 composition. Charge and discharge control circuit 100 is composed of control circuit 105 , charger reverse connection detection circuit 106 , current consumption increasing circuit 130 , VDD terminal 111 , VSS terminal 112 , DO terminal 113 , CO terminal 114 and VM terminal 115 . The consumption current increasing circuit 130 is composed of a switch circuit 131 .

[0024] The positive electrode of the secondary battery 101 is connected to the external terminal 120 and the resistor 102 , and the negative electrode i...

no. 2 approach

[0036] figure 2 It is a circuit diagram of the charging and discharging control circuit and the battery device of the second embodiment.

[0037] The difference from the first embodiment is that a resistor 201 as an impedance element is inserted between the switch circuit 131 and the VDD terminal 111 . Others are the same as the first embodiment.

[0038] Operations of the charge and discharge control circuit and the battery device according to the second embodiment will be described.

[0039] The operation of the overcharged state, overdischarged state, overcurrent state, and charger reverse connection detection circuit 106 is the same as that of the first embodiment. When the charger reverse connection state is reached and the charger reverse connection detection circuit 106 turns on the switch circuit 131 , the consumption current increasing circuit 130 operates, and the current value Ids flows from the VDD terminal 111 to the VSS terminal 112 . This current Ids is adju...

no. 3 approach

[0043] image 3 It is a circuit diagram of the charging and discharging control circuit and the battery device of the third embodiment.

[0044] The difference from the second embodiment is that the resistor 201 is changed to a constant current circuit 301 . Others are the same as the second embodiment.

[0045] Operations of the charge and discharge control circuit and the battery device according to the third embodiment will be described.

[0046] The operation of the overcharge state, overdischarge state, overcurrent state, and charger reverse connection detection circuit 106 is the same as that of the second embodiment. When the charger reverse connection state is reached and the charger reverse connection detection circuit 106 turns on the switch circuit 131 , the consumption current increasing circuit 130 operates, and the current value Ids flows from the VDD terminal 111 to the VSS terminal 112 . This current Ids is adjusted by the constant current circuit 301 , ther...

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Abstract

Provided is a charge and discharge control circuit and a battery device which ensure high safety, even when a charger is reversely connected. The charge and discharge control circuit includes a consumption current increase circuit for supplying a current from a power supply terminal to a ground terminal, the consumption current increase circuit including a switch circuit configured to be turned on in response to a detection signal from a charger reverse connection detection circuit, which indicates that a charger is reversely connected.

Description

technical field [0001] The present invention relates to a charge and discharge control circuit and a battery device for detecting reverse connection of a charger, in particular to a charge and discharge control circuit and a battery device for preventing the charge and discharge control circuit and the battery device from being damaged when the charger is connected in reverse. Background technique [0002] Currently, various portable electronic devices are widespread. These portable electronic devices are usually driven by a battery unit in which a battery is installed. Figure 4 A conventional charge and discharge control circuit and a circuit diagram of a battery device are shown. The conventional charge and discharge control circuit and battery device include an overcharge detection circuit 411, an overdischarge detection circuit 412, an overcurrent detection circuit 413, a delay circuit 415, a logic circuit 417, a charger reverse connection detection circuit 106, a VDD t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02H7/18
CPCH02J7/0052H02J7/0034
Inventor 小池智幸
Owner SII SEMICONDUCTOR CORP
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