Shunt protection circuit for protecting relay contacts
A technology for protecting relays and circuits, applied in relays, circuits, electrical components, etc., can solve problems such as error-prone, relay failure, cumbersome control, etc., and achieve the effect of avoiding impact and protecting relay contacts
Active Publication Date: 2018-11-20
CONTEMPORARY AMPEREX TECH CO
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Problems solved by technology
[0002] At the moment when a high-power load is started or disconnected, a much larger current or voltage will be generated than in normal use. If the relay switch is used to control the power on and off of the load, it is easy to cause the contacts of the relay to burn out and even the relay to fail. , directly causing hidden dangers to the user's personal or property safety
[0003] See figure 1 As shown, it is a commonly used relay contact protection circuit at present. The bypass thyristor and the main relay are respectively controlled by two different I / O ports I / O1 and I / O2 to turn on and off. When it is realized, it is The sequence control of the two channels is realized through the delay on the software, the control is cumbersome and prone to mistakes
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[0021] The technical solution will be described in detail below in conjunction with specific embodiments and accompanying drawings, so as to make it more clear. The following examples are only for describing the detailed examples of the present invention, and are not intended to limit the present invention.
[0022] figure 2 It shows a shunt protection circuit for protecting relay contacts provided by the present invention, which can be used to protect the contacts of relay RY1 and prevent the contacts from being burnt by the instantaneously generated excessive current when the relay K1 is turned on and off.
[0023] The shunt protection circuit consists of:
[0024] The first controllable semiconductor transistor N1 and the second controllable semiconductor transistor N2 connected in parallel with the relay RY1, the controllable semiconductor transistor driving circuit 100 electrically connected to the first controllable semiconductor transistor N1 and the second controllab...
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The invention discloses a shunting protection circuit used for protecting a relay contact point. The shunting protection circuit comprises a first controllable semiconductor tube (N1), a second controllable semiconductor tube (N2), a controllable semiconductor tube driving circuit (100) and a controller (k), wherein the first controllable semiconductor tube (N1) and the second controllable semiconductor tube (N2) are connected in parallel to a relay (RY1); the controllable semiconductor tube driving circuit (100) is electrically connected to the first controllable semiconductor tube (N1) and the second controllable semiconductor tube (N2) respectively; and the controller (k) is electrically connected to the controllable semiconductor tube driving circuit (100). The controller (k) comprises an interface (I / O1) used for inputting / outputting a signal. The interface (I / O1) used for inputting / outputting the signal is electrically connected to the relay (RY1) and is electrically connected to the first controllable semiconductor tube (N1) and the second controllable semiconductor tube (N2) respectively via the controllable semiconductor tube driving circuit (100). By using the shunting protection circuit used for protecting the relay contact point, a purpose that an impact of a heavy current on the relay contact point can be reduced is reached.
Description
technical field [0001] The invention belongs to the field of relays, and more specifically, the invention relates to a shunt protection circuit for protecting relay contacts. Background technique [0002] At the moment when a high-power load is started or disconnected, a much larger current or voltage will be generated than in normal use. If the relay switch is used to control the power on and off of the load, it is easy to cause the contacts of the relay to burn out and even the relay to fail. , directly causing hidden dangers to the user's personal or property safety. [0003] See figure 1 As shown, it is a commonly used relay contact protection circuit at present. The bypass thyristor and the main relay are respectively controlled by two different I / O ports I / O1 and I / O2 to turn on and off. When it is realized, it is The sequence control of the two channels is realized through the delay on the software, which is cumbersome and prone to mistakes. [0004] Therefore, it ...
Claims
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IPC IPC(8): H01H47/02
Inventor 陈亚杰赵军凯
Owner CONTEMPORARY AMPEREX TECH CO