Alternating-current switch and control method thereof
An AC switch and switch technology, applied in the field of circuits, can solve the problems of poor on-off flexibility of AC switches, and achieve the effect of solving the poor on-off flexibility and improving the on-off flexibility.
Active Publication Date: 2014-07-09
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0013] The main purpose of the present invention is to provide an AC switch and its control method to solve the problem of poor on-off flexibility of the AC switch
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[0031] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0032] image 3 is a functional block diagram of the AC switch according to the first embodiment of the present invention, such as image 3 As shown, the AC switch includes two connection terminals and two control terminals, wherein the two connection terminals are respectively connected to the AC line where the AC switch is located, and the two connection terminals can be set accordingly according to the needs of the line, for example, directly set as The wire is connected to the wire in the AC line, or set as a connection port adapted to the AC line; the two control terminals are connected to the external control circuit or control device to receive external control signals, including positi...
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The invention discloses an alternating-current switch and a control method of the alternating-current switch. The alternating-current switch comprises two connection terminals, two control terminals and four switch control units. The second end of a first switch is connected with the first connection terminal, and the first control end of the first switch is connected with the first control terminal. The first switch unit is switched on when the voltage at the first end of the first switch is higher than the voltage at the second end of the first switch and the first control end of the first switch is connected with positive voltage; otherwise, the first switch unit is switched off. The first end of a second switch is connected with the first end of the first switch. The second end of the second switch is connected with the second connection terminal. The second control end of the second switch is connected with the second control terminal. The second switch unit and the first switch unit have the same switching characteristic. The third switch unit is connected with the first switch unit in parallel. When the voltage at one end of the third switch unit is higher than the voltage at the other end of the third switch unit, the third switch unit is switched on; otherwise, the third switch unit is switched off. The fourth switch unit is connected with the second switch unit in parallel, and the fourth switch unit and the third switch unit have the same switching characteristic. By the adoption of the alternating-current switch, an alternating-current circuit can be closed and opened at will instantly in a complete period, and the flexibility is high.
Description
technical field [0001] The invention relates to the field of circuits, in particular to an AC switch and a control method thereof. Background technique [0002] AC switches are widely used devices in power systems. In some high-voltage, high-current, and fast-moving occasions, the switching characteristics of power electronic devices can be used to control the on-off of the circuit, for example: using the on-off characteristics of the thyristor , By controlling the gate voltage of the thyristor, the on-off of the circuit between the anode and the cathode can be controlled. Compared with the traditional contactor-relay system, this type of power electronic switching device has no contacts and movable mechanical structures in its main circuit and control circuit. Therefore, there are no problems such as arcing, contact wear and welding. It has been widely used in modern power systems. However, only the turn-on of the thyristor is controllable, and the turn-off can only be co...
Claims
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IPC IPC(8): H03K17/567
Inventor 丁屹峰段大鹏钱叶牛于希娟赵贺周作春唐宇
Owner STATE GRID CORP OF CHINA