Multi-cell protection board disconnection detection circuit
A technology of disconnection detection and protection board, which is applied to the components of electrical measuring instruments, measuring electronics, measuring devices, etc., and can solve the problems of large chip impedance and large circuit power consumption
Active Publication Date: 2020-04-03
西安华泰半导体科技有限公司
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Problems solved by technology
[0002] With the development of battery-related technologies, more and more lithium batteries are used in various fields, and its various abnormal state detection and protection measures have become the focus of everyone's attention. At present, when multi-cell lithium battery disconnection detection , the commonly used circuit detection system is that each battery pack corresponds to a protection chip, because the single-chip circuit detection method is used to protect each battery in the battery pack, and the detection circuit is always working to detect whether the battery is disconnected , there is a large internal impedance of the chip, which leads to the problem of large power consumption of the circuit
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Embodiment 1
[0029] In Embodiment 1 of the present invention:
[0030] Such as figure 1 and figure 2 As shown, the battery disconnection detection circuit A includes a high-voltage PMOS transistor M a0 ~ M a(n-1) , voltage V DDHV with high voltage PMOS tube M a0 ~ M a(n-1) The source is connected to the high voltage PMOS transistor M a0 with high voltage PMOS tube M a1 ~ M a(n-1) Respectively constitute a current mirror, a high-voltage PMOS tube M a0 is the source of the current mirror, the DC current source I A1 Connected to the high voltage PMOS transistor M a0 The drain provides a mirror current for it, and the high-voltage PMOS transistor M a0 The drain of the DC current source with I A1 connected to the input of the DC current source I A1 The output terminal is grounded;
[0031] Among them, the high-voltage PMOS tube M a0 with high voltage PMOS tube M aj constitutes a current mirror as a DC current source I aj , high voltage PMOS tube M bj as switch SW j , high vo...
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The invention discloses a disconnection detecting circuit for a multi-cell protection panel. A narrow pulse signal generating circuit B provides periodical narrow pulse signals so as to enable a battery disconnection detecting circuit A to detect disconnection condition of each cell except the uppermost cell, so that circuit power consumption is reduced effectively. The battery detection circuit can perform disconnection detection on each cell except the uppermost cell and can distinguish overvoltage and line disconnection of the cells and can take corresponding protection measures, so that lithium battery safety and reliability are improved. The battery detecting circuit enables the gate electrode voltage of a PMOS tube to be VCj+1 which is the voltage of the <j+1>th cell through connecting the jth cell VCj to a source electrode of the high voltage PMOS tube; when disconnection of the jth cell occurs, VCj is firstly pulled up by VCn which is the voltage of the uppermost cell; when VCjis higher than (VCj+1+VGS), the high voltage PMOS is put through and the VCj is pulled down, so that the VCj cannot be pulled too high. Therefore, a problem of insufficient voltage resistance of components in the circuit is solved.
Description
technical field [0001] The invention belongs to the technical field of battery protection, and in particular relates to a disconnection detection circuit for a multi-cell protection board. Background technique [0002] With the development of battery-related technologies, more and more lithium batteries are used in various fields, and its various abnormal state detection and protection measures have become the focus of everyone's attention. At present, when multi-cell lithium battery disconnection detection , the commonly used circuit detection system is that each battery pack corresponds to a protection chip, because the single-chip circuit detection method is used to protect each battery in the battery pack, and the detection circuit is always working to detect whether the battery is disconnected , there is a large internal impedance of the chip, which leads to the problem of large power consumption of the circuit. Contents of the invention [0003] The purpose of the p...
Claims
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IPC IPC(8): G01R31/396G01R31/54G01R1/30
CPCG01R1/30G01R31/396G01R31/50
Inventor 李演明吴凯凯张豪刘雨鑫周罡曹灿
Owner 西安华泰半导体科技有限公司