Short circuit protection module, switching power supply short circuit protection system and switching power supply short circuit protection method
A switching power supply and short-circuit protection technology, which is applied in the direction of electrical components, output power conversion devices, etc., to achieve the effect of simplifying the circuit structure and improving reliability
Pending Publication Date: 2022-07-22
SUZHOU INOVANCE CONTROL TECH CO LTD
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[0005] The main purpose of the present invention is to propose a short-circuit protection module, a switching power supply short-circuit protection system and method, aiming to solve the technical problem of how to ensure the reliability of the switching power supply short-circuit protection without additionally occupying the auxiliary winding
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[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly. ...
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The invention discloses a short-circuit protection module, a switching power supply short-circuit protection system and a switching power supply short-circuit protection method. The method comprises the following steps: acquiring output voltage of a switching power supply primary and secondary side module through a switching power supply output feedback module, and generating a feedback signal according to the output voltage; and when the working state is a short-circuit state, the short-circuit protection module generates a first square wave signal and transmits the first square wave signal to the enabling end of the PWM control module, so that the PWM control module performs short-circuit protection on the switching power supply based on the first square wave signal. According to the invention, when the working state is the short-circuit state, the short-circuit protection module generates the first square wave signal, and the first square wave signal can control the working state of the switching power supply, so that short-circuit hiccup protection can be carried out on the switching power supply. An auxiliary winding does not need to be additionally occupied, and the circuit structure is simplified. And moreover, the wave emission enabling of the PWM control module can be controlled by identifying the working state of the switching power supply, so that the reliability of short-circuit protection of the switching power supply is effectively improved.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a short circuit protection module, a switching power supply short circuit protection system and method. Background technique [0002] In the application of switching power supply, short-circuit protection is an indispensable function of the switching power supply system. Commonly used protection methods such as short-circuit constant current and short-circuit shutdown are used. The short-circuit constant current protection is to limit the output current when the output short-circuit is detected to make it work in the constant current output state. This method will produce a large short-circuit loss and a large temperature rise of the peripheral devices; the short-circuit shutdown protection is When the output short circuit is detected, the output is directly turned off. This method generally requires the power system to start first before adding the load, because...
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IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 孙伟左德祥
Owner SUZHOU INOVANCE CONTROL TECH CO LTD