Surge protection circuit and electric appliance equipment
A surge protection and circuit technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as low mains signal and surge false protection, etc. Achieve the effect of avoiding the influence of surge signal and ensuring stable work
Pending Publication Date: 2018-11-13
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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Problems solved by technology
However, because the mains signal is low when the mains is at the zero crossing point, it may be misjudged by the circuit as a negative surge signal, which is prone to surge false protection
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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0029] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.
[0030] In addition, if there are descriptions involving "first", "second" and ...
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The invention discloses a surge protection circuit and electric appliance equipment; the surge protection circuit comprises the following parts: a forward surge detection circuit used for detecting aforward surge signal in an AC power supply; a backward surge detection circuit used for detecting a backward surge signal in the AC power supply; a zero cross detection circuit used for detecting an AC power supply zero crossing point; a controller used for starting surge protection after receiving a detection signal outputted by the forward / backward surge detection circuit; the controller also does not respond to a detection signal outputted by the backward surge detection circuit when the zero cross detection circuit outputs a zero cross detection signal. The surge protection circuit can detect the AC power supply inputted in electric appliance equipment in real time, and can effectively provide the surge protection function at any time, thus preventing the whole electric appliance equipment from being affected by the surge signals, and ensuring the electric appliance equipment to stably work.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a surge protection circuit and electrical equipment. Background technique [0002] With the development of science and technology, household appliances such as induction cookers and rice cookers are becoming more and more popular in daily life. When there are many electrical equipment used in a power grid, the interference signals such as surges and clutter in the power grid will also become more and more Severe and frequent occurrences seriously affect the performance and service life of household appliances, and pose potential safety hazards. [0003] The existing surge protection circuit mainly realizes the positive and negative protection functions of electrical equipment by detecting the positive and negative surge signals of the AC power supply and starting the surge protection. However, because the mains signal is low when the mains is at the zero crossing poi...
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IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 陈伟李睿汪钊肖小龙王彪
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD