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Driving circuit for discharge over-current protection and recovery, battery protection circuit and system

A technology for protecting circuits and driving circuits, applied in emergency protection circuit devices, battery circuit devices, electric vehicles, etc., to achieve the effect of blocking leakage current

Active Publication Date: 2012-09-05
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leakage can still cause the various problems mentioned above

Method used

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  • Driving circuit for discharge over-current protection and recovery, battery protection circuit and system
  • Driving circuit for discharge over-current protection and recovery, battery protection circuit and system
  • Driving circuit for discharge over-current protection and recovery, battery protection circuit and system

Examples

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Embodiment Construction

[0037] see image 3 , which shows an embodiment of the battery protection circuit system of the present invention. and figure 2 shown in the existing battery protection circuit system compared to the image 3 The battery protection circuit system shown increases the charger overvoltage detection circuit and a logic AND gate And2, and also improves the discharge overcurrent protection recovery drive circuit.

[0038] The charger overvoltage detection circuit is used to detect the voltage of the VM terminal, and output the charger overvoltage detection result OVCHG after comparing the voltage of the VM terminal with a predetermined reference voltage Vref, and the charger overvoltage detection result includes the charger overvoltage and the charger overvoltage detection result. Not overpressurized. The logical AND gate And2 performs a logical AND on the control signal Co_pre output by the control circuit and the charger overvoltage detection result OVCHG, and then serves as t...

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Abstract

The invention discloses a recovery and driving circuit of discharge over-current protection in a battery protection circuit and comprises a VM link end and a VSS link end; wherein, the recovery and driving circuit comprises an isolated NMOS transistor and a first resistor; a drain of the isolated NMOS transistor is connected with a first link end through the first resistor; a source electrode of the isolated NMOS transistor is connected with a second link end; a grid of the isolated NMOS transistor is used for receiving discharge over-current signals; the drain and the source electrode of the isolated NMOS transistor are communicated when the grid of the isolated NMOS transistor receives the discharge over-current signals, which causes the VM link end and the VSS link end to be communicated; a diode is formed between a substrate and the source electrode of the isolated NMOS transistor, and the cathode of the diode is connected with the source electrode of the isolated NMOS transistor; and the anode of the diode is connected with the substrate of the isolated NMOS transistor; when the VM is negative voltage relative to VSS, as a diode D1 is arranged between a substrate of a transistor MN1 and the VSS, the diode D1 can be reversely biased to block the generation of leakage current.

Description

technical field [0001] The invention relates to a battery protection circuit, in particular to a discharge overcurrent protection recovery drive circuit in the battery protection circuit. Background technique [0002] Since lithium-ion batteries have no memory effect, they are gradually replacing traditional nickel-metal hydride batteries in more and more electronic systems and becoming the main power source in portable electronic devices. But lithium batteries have many safety issues. Therefore, complex protection circuits exist in lithium battery systems to ensure that unsafe conditions are prevented from causing battery damage in various unexpected situations. [0003] figure 1 An existing lithium battery protection circuit system is shown. Such as figure 1 As shown, a charging switch MC and a discharging switch MD are arranged between the external negative pole V_ and the internal negative pole VSS of the battery. By controlling the opening or closing of the charging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18H02J7/00
Inventor 王钊尹航杨晓东
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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