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An overcurrent detection circuit

A technology of overcurrent detection and current detection, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve the problems of consuming battery power and affecting the accuracy of current detection, so as to realize overcurrent detection and reduce power consumption. consumption effect

Active Publication Date: 2016-08-31
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In a power system (such as an electric vehicle), the resistor Rsense needs to withstand a considerable current, and the change of the resistance of the resistor Rsense also directly affects the accuracy of current detection. In addition, there is always current flowing through the resistor Rsense during normal operation, which consumes an additional battery power

Method used

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Embodiment Construction

[0021] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0023] figure 2 shows an embodiment of the overcurrent detection circuit in the present invention, image 3 for figure 2 The schematic diagram of the circuit structure...

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Abstract

The invention provides an overcurrent detection circuit, which includes: a battery protection circuit, which has a power terminal, a ground terminal, a charging protection terminal, a discharge protection terminal and a current detection terminal; and a charging switch tube connected in series between the battery negative electrode and the load. and a discharge switch tube, the control terminal of the charging switch tube is connected to the charging protection terminal, the control terminal of the discharge switch tube is connected to the discharge protection terminal; the current sampling transistor has its first connection terminal connected to the current detection terminal, and its second connection terminal connected to the discharge switch The second connection end of the tube is connected, and its control end is connected to the control end of the discharge switch tube. The current sampling transistor samples the current flowing on the discharge switch tube to obtain the sampling current. The battery protection circuit includes a current comparison circuit connected to the current detection end. It determines whether the current flowing through the discharge switch tube is overcurrent based on the sampled current. Compared with the existing technology, the overcurrent detection circuit in the present invention can realize overcurrent detection without setting an overcurrent detection resistor, and the power consumption is reduced.

Description

【Technical field】 [0001] The invention relates to the field of circuit design, in particular to an overcurrent detection circuit. 【Background technique】 [0002] In the field of lithium battery protection, the lithium battery protection chip needs to have an overcurrent detection and protection function. The commonly used overcurrent detection circuit senses the change of current through a resistor Rsense connected to the negative pole of the battery cell. The voltage generated on the resistor and the internal voltage of the chip The reference voltage is compared, and then the signal of excessive discharge current is obtained to realize the function of protecting the lithium battery. This kind of application has high requirements on the power and resistance accuracy of the resistor, and the resistor will consume extra power of the battery. [0003] figure 1 An overcurrent detection circuit in the prior art is shown, and the overcurrent detection circuit includes a battery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165
Inventor 张汉儒王钊尹航
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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