A kind of working power supply of smart electric energy meter provided with short-circuit protection circuit
A short-circuit protection circuit and smart energy meter technology, applied in the direction of protection against overcurrent, etc., to achieve good application prospects, easy maintenance, and strong versatility.
Active Publication Date: 2018-02-09
STATE GRID CORP OF CHINA +2
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Problems solved by technology
[0003] The technical problem solved by the present invention is to overcome the problems in the power supply of the smart electric energy meter in the prior art
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[0018] The present invention will be further described below in conjunction with the accompanying drawings.
[0019] Such as figure 1 As shown, the working power supply of the intelligent electric energy meter provided with the short-circuit protection circuit of the present invention includes a power supply, and the power supply is provided with multiple power supply output terminals, and each power supply output terminal is connected to the corresponding load, and also includes multiple short-circuit protection circuits. The short-circuit protection circuits are respectively arranged between the output terminals of the power supply and the corresponding loads. Each short-circuit protection circuit includes a start-up circuit and a control circuit connected in parallel. The start-up circuit is used to provide working voltage to the load connected to it when the power supply is powered on; It is used to disconnect the direct output of the power supply to the load when the load...
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The invention discloses an intelligent electric energy meter working power supply provided with a short-circuit protection circuit. The working power supply comprises a power supply and multipath short circuit protection circuits. The power supply is provided with multipath power supply output terminals. Each power supply output terminal is connected to a corresponding load. Each short circuit protection circuit is arranged between each power supply output terminal and the corresponding load respectively. Each short circuit protection circuit comprises a starting circuit and a control circuit which are connected in parallel. The starting circuit is used for providing a work voltage for the load connected to the power supply when the power supply is electrified. The control circuit is used for disconnecting output of the power supply to the load when the load is in a short circuit state so that the power supply is prevented from damaging because of the short circuit and a purpose of protecting the power supply through the short circuit is realized. When the load in the short circuit state, the power supply providing the power supply output is prevented from generating short circuit damages so that a purpose of protecting the power supply is reached. After a short circuit fault is removed, the power supply circuit can be automatically recovered to a normal power supply state. The power supply possesses advantages of low cost and easy maintenance and possesses a good application prospect.
Description
technical field [0001] The invention belongs to the technical field of protection circuits of intelligent electric energy meters, and in particular relates to a working power supply of an intelligent electric energy meter provided with a short circuit protection circuit. Background technique [0002] With the development of science and technology, the improvement of industrial production and people's living standards, the smart energy meter, an important part of the smart grid, has more and more functions, which involve multiple working modules such as measurement, calculation, and communication. The working power supply, which can be used without causing any danger, if any abnormality occurs in any working power supply circuit, it will not affect the work of other working power supplies. Although most of the working power supplies of smart energy meters on the market are multi-output, when a short circuit occurs in one of the working power supplies, it will cause damage to ...
Claims
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IPC IPC(8): H02H3/08
Inventor 田正其周超刘建祝宇楠纪峰徐晴穆小星
Owner STATE GRID CORP OF CHINA