An overvoltage protection circuit and its overvoltage detection circuit
An overvoltage protection circuit, overvoltage detection technology, applied in measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problem of poor applicability, the overvoltage detection circuit does not have the overvoltage hold function, and the unfavorable control circuit sampling To the overvoltage state and other problems, to achieve the effect of reliable performance, simple structure and strong applicability
Active Publication Date: 2017-03-22
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +2
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Problems solved by technology
[0005] The purpose of the embodiments of the present invention is to provide an overvoltage detection circuit for an overvoltage protection circuit, which aims to solve the problem that the existing overvoltage detection circuit does not have an overvoltage hold function, which is not conducive to other control circuits sampling to an overvoltage state, and can be applied sex problem
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[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0019] In view of the problems existing in the existing overvoltage detection circuit, in the embodiment of the present invention, the overvoltage detection circuit includes a feedback circuit, and when the overvoltage detection circuit outputs an overvoltage signal, the feedback circuit keeps the output of the sampling voltage divider circuit to the comparison circuit The sampled output value is greater than the preset value, so that the overvoltage state can be maintained.
[0020] figure 1 The circuit principle of the overvoltage detection circuit of the overvoltage protection circuit provided ...
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This invention belongs to the electronic circuit design field and provides an overvoltage protection circuit and an overvoltage detection circuit thereof. The overvoltage detection circuit comprises a voltage dividing circuit, a comparison circuit, an enabling circuit and a feedback circuit. The voltage dividing circuit is used for performing voltage dividing sampling on the voltage inputted in the protected circuit and outputting the sampling output value; the comparison circuit is used for outputting overvoltage comparison signals when the sampling output value is greater than the predetermined value; the enabling circuit is used for outputting overvoltage signals to the protection execution circuit of the overvoltage protection circuit when the comparison circuit outputs the overvoltage comparison signals;and the feedback circuit is used for keeping the sampling output value to be greater than the predetermined value when the comparison circuit outputs the overvoltage comparison signals. The overvoltage detection circuit is simple in structure and reliable in performance. In the meantime, the feedback keeps the sampling output value transmitted by sampling voltage dividing circuit to the comparison circuit is greater than the predetermined value when the comparison circuit outputs the overvoltage comparison signal, so that the overvoltage state can be kept, which is beneficial for other control circuits to sample the overvoltage state and has high applicability.
Description
technical field [0001] The invention belongs to the field of electronic circuit design, in particular to an overvoltage protection circuit and an overvoltage detection circuit thereof. Background technique [0002] Overvoltage protection means that when the voltage input to the protected circuit is higher than a certain value, the voltage is cut off or suppressed to avoid damage to the protected circuit. In electronic circuit design, the overvoltage protection circuit placed at the front end of the protected circuit is widely used to realize the overvoltage protection of the protected circuit. [0003] As is known, a voltage comparison type overvoltage protection circuit includes an overvoltage detection circuit and a protection execution circuit. The overvoltage detection circuit is used to detect whether the voltage input to the protected circuit exceeds the preset value, and then output the corresponding overvoltage detection value; the protection execution circuit is us...
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IPC IPC(8): G01R19/165
Inventor 周明杰黄晓东
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD