An overvoltage protection circuit and a lamp
An overvoltage protection circuit and circuit technology, which is applied in the direction of protection against overvoltage, can solve problems such as component damage, and achieve the effect of avoiding damage
Active Publication Date: 2018-10-26
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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Problems solved by technology
[0003] The technical problem to be solved by the embodiments of the present invention is to provide an overvoltage protection circuit and a lamp, which are used to solve the problem that the components in the load are damaged due to the overvoltage of the output of the power supply
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[0019] 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 some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0020] see figure 1 , figure 1 It is a schematic circuit diagram of an overvoltage protection circuit disclosed in an embodiment of the present invention. like figure 1 As shown, the circuit includes:
[0021] Current limiting resistor R5, bias resistor R6, bias resistor R7, current limiting resistor R8, transistor Q1, transistor Q2, photocoupler U2, relay K1 and comparator 100, wherein:
[0022] The output terminal 1 of the comparator 100 is electrically ...
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The embodiment of the invention relates to the technical field of electronic circuits, and discloses an overvoltage protection circuit and a lamp. The circuit comprises a current limiting resistor R5, a bias resistor R6, a bias resistor R7, a current limiting resistor R8, a triode Q1, a triode Q2, a photoelectric coupler U2, a relay K1 and a comparator 100. When a power supply outputs the overvoltage, the triode Q1 and the triode Q2 are connected through the high level output by the output end of the comparator, the photoelectric coupler U2 is then turned on, and the conversion contact in the relay K1 is converted to the other fixed contact from one fixed contact through a loop composed of the direct-current voltage connected with the current limiting resistor R8, the current limiting resistor R8, the photoelectric coupler U2, the relay K1 and the ground, the power supply and a load are disconnected, and therefore components in the load are protected. By means of the overvoltage protection circuit, the power supply and the load can be disconnected when the power supply outputs the overvoltage, and the phenomenon that the load is damaged when the power supply outputs the overvoltage is avoided.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an overvoltage protection circuit and a lamp. Background technique [0002] With the rapid development of electronic technology, various electronic products are used in people's life and work, and the normal work of various electronic products is inseparable from electric energy, which makes electronic products have a certain influence on the voltage of the power supply. A lot of dependencies. In the existing circuits, most circuits do not have overvoltage protection for the output of the power supply, or some circuits use an overvoltage protection chip to protect the output of the power supply, but the overvoltage protection chip needs to work under relatively precise conditions, so Existing circuits that use an overvoltage protection chip to protect the output of a power supply from overvoltage have disadvantages such as complex structure, high cost, and inconvenie...
Claims
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IPC IPC(8): H02H3/20
Inventor 周明杰杨小军
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD