Overcurrent protection circuit and method for large-current discharge
An over-current protection circuit and high-current discharge technology, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve problems such as increased product costs
Pending Publication Date: 2022-04-15
深圳感跃智能有限公司
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Problems solved by technology
[0003] In order to solve the problem that when the battery discharges a high-current load, in addition to the high-current load itself, it is necessary to install a field-effect transistor for detecting the over-discharge current to control the discharge switch, and the battery protection board also needs to be equipped with a corresponding field-effect transistor that can pass a large current, so that In the case of large current application, the cost of the product increases greatly, and the invention provides an overcurrent protection circuit and method for high current discharge
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[0059] The following examples are further explanations and supplements to the present invention, and do not constitute any limitation to the present invention.
[0060] An overcurrent protection circuit for large current discharge according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
[0061] refer to figure 1 As shown, the present invention provides an overcurrent protection circuit for large current discharge, including:
[0062] The control circuit 10 is used to detect the discharge current of the input high current load to obtain a detection signal;
[0063] The micro control unit 20 is used to judge whether the discharge current has an overcurrent situation according to the detection signal, and if so, output a first control signal;
[0064] The control circuit 10 is further configured to stop the discharge current input to the large current load when receiving the first control signal.
[0065] It shou...
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The invention relates to an overcurrent protection circuit and method for high-current discharge, and belongs to the field of current detection. The overcurrent protection circuit comprises a control circuit used for detecting a discharge current input into a large-current load to obtain a detection signal; the micro-control unit is used for judging whether the discharge current has an overcurrent condition or not according to the detection signal, and outputting a first control signal if the discharge current has the overcurrent condition; and the control circuit is also used for stopping the discharge current input to the large-current load when receiving the first control signal. According to the invention, the control circuit is independently arranged for a product needing large-current discharge application to carry out overcurrent detection and input control on the discharge current input into the large-current load, so that the discharge current input into the large-current load by the battery is prevented from entering the battery protection board, and a large-current field-effect tube does not need to be additionally arranged on the battery protection board; and the product cost is effectively reduced while the product safety is ensured.
Description
technical field [0001] The invention relates to the field of current detection, in particular to an overcurrent protection circuit and method for large current discharge. Background technique [0002] Products powered by batteries on the market generally have a discharge overcurrent protection function, and usually set a battery protection board for the battery itself for charge / discharge protection. However, considering that the battery is often used to input discharge current to a small current load, the battery generates The discharge current of the battery will not be too large, so the FET in the battery protection board is a FET (MOS tube, MOSFET) suitable for inputting a small current, so that when the battery discharges a large current load, in addition to the large current load itself The field effect transistor used to detect the over-discharge current to control the discharge switch is provided, and the battery protection board also needs to be provided with a fiel...
Claims
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Inventor 蒋飞何超黄毅强
Owner 深圳感跃智能有限公司