An overcurrent protection circuit
An overcurrent protection circuit and main circuit technology, applied in the field of electronics, can solve problems such as excessive current intake, and achieve the effect of avoiding excessive current intake
Active Publication Date: 2019-11-29
苏州市朗世润电子有限公司
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Problems solved by technology
[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an overcurrent protection circuit that can better solve the problem of excessive current drawn by electronic products at the moment of power-on.
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[0042] In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described The embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.
[0043] figure 1 is the circuit diagram of the present invention, refer to figure 1 It can be seen that the present invention discloses an overcurrent protection circuit, which includes:
[0044] Current detection unit 10: used to detect the real-time current on the main line;
[0045] Rated value determination...
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The invention discloses an over-current protection circuit which comprises a current detection unit, a rated value determination unit, a short time trigger unit, a logic control unit and a switch switching unit, wherein the current detection unit is used for detecting a real-time current of a main line; the rated value determination unit is coupled with the current detection unit and used for judging whether the real-time current exceeds a rated current value; the short time trigger unit is coupled with the rated value determination unit, and when it is detected that the rated value determination unit sends determination signals exceeding a rated current, the short time trigger unit sends pulse; the logic control unit receives the pulse sent by the short time trigger unit and sends control signals according to the pulse; the switch switching unit controls the disconnection of the main line according to the control signals sent by the logic control unit. According to the over-current protection circuit, the problem that a sinking current is too high during a power-on instant can be solved well.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an overcurrent protection circuit. Background technique [0002] In electronic products, there is often a phenomenon of overcurrent protection of the power supply at the moment of power-on, mainly because too many energy storage devices such as capacitors are used in electronic products, so that the inhalation current is too large at the moment of power-on, exceeding the maximum power supply. current, causing power protection to prevent the product from working properly. [0003] At present, in order to solve the problem of excessive sink current, the prior art mostly adopts a resettable fuse or a negative temperature coefficient resistor to realize the problem. Using this method can only slightly alleviate the sink current problem, but cannot solve the problem, and if the product has a short circuit, this method cannot effectively suppress it. Contents of the invention ...
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IPC IPC(8): H02H3/08
CPCH02H3/08
Inventor 陈奎
Owner 苏州市朗世润电子有限公司