Short circuit protection circuit
A short-circuit protection circuit and circuit technology, applied in electrical components, output power conversion devices, etc., can solve the problems of prolonging sleep time, accelerating aging, and prolonging short-circuit recovery response time, so as to reduce the average short-circuit power consumption and improve the response speed. , the effect of reducing power consumption time
Active Publication Date: 2016-02-10
DIOO MICROCIRCUITS CO LTD
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Problems solved by technology
[0004] This kind of hiccup mode still has two main disadvantages. One is that when a short circuit occurs, it must go through a soft-start period of current-limiting working state before entering sleep, and the soft-start period is usually on the order of milliseconds. The switching power supply system will suffer huge power consumption during the period of current-limiting working state, and will accelerate aging. Another disadvantage is that the soft-start cycle is the minimum unit of the sleep time. Extending the sleep time can reduce the power consumption during short-circuit , but it will also lengthen the response time of short circuit recovery
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[0023] The implementation of the present invention is described below with specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The invention may be practiced or applied in other and different embodiments.
[0024] see figure 1 , to understand the operation of the short circuit protection circuit of the present invention. As shown in the figure, the short circuit protection circuit 1 of the present invention is coupled to the output adjustment circuit 3 and is characterized by including a short circuit detection module 11 , a counting module 12 , a first signal generation module 13 and a second signal generation module 14 .
[0025] The output adjustment circuit 3 outputs voltage to an external load.
[0026] The short-circuit detection module 11 is used to detect whether the output of the output adjustment circuit 3 is in a short-circuit state, and to sen...
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A short circuit protection circuit is disclosed. The short circuit protection circuit is coupled with an output regulator circuit; the short circuit protection circuit comprises a short circuit detection module, a counting module, and a first signal generation module and a second signal generation module that have no correlation with soft start, wherein when the short circuit detection module detects that the output of the output regulator circuit is in a short circuit state, the short circuit detection module gives out a short circuit signal; the short circuit signal enables the counting of the counting module to pass through a first clock period, and sends information to enable the first signal generation module to give out a dormant starting signal so as to enable the output regulator circuit to stop the outputting; in addition, when the first signal generation module gives out the dormant starting signal, the dormant starting signal enables the counting of the counting module to pass through a second clock period, then the second signal generation module gives out a dormant finishing signal so as to enable the output regulator circuit to output again.
Description
technical field [0001] The invention relates to a short circuit protection circuit, in particular to a short circuit protection circuit with hiccup mode. Background technique [0002] In today's market, high-current DC-DC switching power supplies are widely used. However, once a short-circuit accident occurs in the system using this power supply, it may cause safety accidents due to excessive temperature rise. Short circuit protection circuit to improve product reliability. [0003] Currently known short-circuit protection circuits mainly use two methods, one of which is foldback current limiting, which takes the output current limit of the switching power supply as the control target, but this method of short-circuit protection circuit has disadvantages, including not having Thorough automatic recovery capability, and because the current limit threshold cannot be lowered without limit, it cannot greatly reduce short-circuit consumption and so on. Another better way is the...
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IPC IPC(8): H02M1/32
Inventor 蒋浩
Owner DIOO MICROCIRCUITS CO LTD