Control circuit and control method of switching circuit and switching circuit
A switching circuit and control circuit technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as failure to accurately detect faults, failure to start the converter, slowness, etc.
Pending Publication Date: 2022-07-05
JOULWATT TECH INC LTD
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Problems solved by technology
In particular, when the load is a large capacitor, the output voltage rises slowly during the startup process, and may not exceed the protection threshold within the specified time, triggering a short-circuit protection fault and causing the converter to fail to start
In addition, when the output is not completely short-circuited, the existing short-circuit protection mechanism cannot accurately detect the fault of the output short-circuit
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[0041] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and arrangements within the spirit and scope of the present invention.
[0042] In order to give the public a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.
[0043] The invention is described in more detail by way of example in the following paragraphs with reference to the accompanying drawings. It should be noted that, the accompanying drawings are all in a relatively simplified form and in an inaccurate scale, so as to facilitate and clearly assist in explaining the purpose of th...
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The invention provides a control circuit and a control method of a switching circuit and the switching circuit, which are characterized in that an output electric signal of the switching circuit is received, the output electric signal is compared with a reference signal, when the comparison result meets the condition, whether the variable quantity of the output voltage within a first threshold time range is smaller than a first threshold is judged, and if yes, the switching circuit is switched on. If yes, the switching circuit is controlled to trigger short-circuit protection; performing error amplification on the output voltage and the reference voltage to obtain a compensation signal; and when the switching circuit does not trigger short-circuit protection, the compensation signal controls the switching circuit to work normally. The output short-circuit condition can be accurately detected, and a short-circuit protection mechanism can be triggered in time.
Description
technical field [0001] The invention relates to the field of power electronics, in particular to a control circuit, a control method and a switch circuit of a switch circuit. Background technique [0002] In the prior art, a common output short-circuit protection mechanism of a switching circuit is: after the output voltage is lower than a certain threshold for a certain period of time (deglitch time), the circuit determines that the output is short-circuit fault, shuts down the converter or enters hiccup mode. In particular, when the load is a large capacitor, the output voltage rises slowly during the startup process, and may not cross the protection threshold within the specified time, thereby triggering a short-circuit protection fault and causing the converter to fail to start. In addition, when the output is not completely short-circuited, the existing short-circuit protection mechanism cannot accurately detect the fault of the output short-circuit. SUMMARY OF THE IN...
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IPC IPC(8): H02M1/36G01R31/52H02H3/28
CPCH02M1/36G01R31/52H02H3/28
Inventor 何勇吉董浩
Owner JOULWATT TECH INC LTD