DC arc extinguishing device
An arc extinguishing device and arc extinguishing technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as short electrical life of mechanical switches, achieve fast arc extinguishing speed, and reduce breaking voltage. , Good arc extinguishing effect
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Embodiment 3
[0079] When it is necessary to control the forward and reverse arc extinguishing of the DC motor, such as Figure 4 As shown, it is only necessary to increase the number of related components and enable terminals appropriately, and the working principle is the same, so it will not be described again.
[0080] Embodiment 4 of the DC arc extinguishing device of the present invention, as Figure 5 Shown:
[0081] A DC arc extinguishing device, which includes a voltage detection switch A, a capacitor C1, a first current limiting element R1 (a resistor, a charging unit B), and the capacitor C1 is connected to the power input end of the mechanical switch K1 through the first current limiting element R1 , the detection end of the voltage detection switch A is connected to the power input end of the mechanical switch K1 (when the mechanical switch K1 is a bridge structure, it can be the contact bridge of the mechanical switch K1, and the second capacitor C2 can be selected according ...
Embodiment 4
[0084] Embodiment 4, the capacitor C1 can be an electrolytic capacitor, the capacitor C1 is connected to the power input end of the mechanical switch K1 through the first current limiting element R1, and the detection end of the voltage detection switch A is connected to the power input end (or touch bridge) of the mechanical switch K1 The connection can play an arc extinguishing effect on the closing and bouncing of the mechanical switch K1, and at the same time, after the capacitor C1 is fully charged, it has the advantage of no power consumption.
[0085] In the first, second, third, and fourth embodiments above, the turn-on voltage of the first semiconductor device Z1 needs to be greater than 3 volts (greater than the peak-to-peak value of the system ripple voltage), and a transient diode, trigger diode, or varistor can be used. For equivalent devices, when the turn-on voltage of the thyristor is greater than 5 volts, the first semiconductor device Z1 is selected according ...
Embodiment 5
[0095] Embodiment 5, the voltage signal at the connection end of the mechanical switch K1 and the load RL1 may be the voltage signal at both ends of the load RL1, or may be the potential difference between the capacitor C1 and the load RL1 (that is, the voltage signal between the two ends of the power semiconductor device SCR1 Potential difference); the voltage detection switch A adopts a one-way thyristor, which has the advantages of high current rise rate tolerance and good reliability. At the same time, the charging unit B is used, which has the advantage of small current impact when the mechanical switch K1 is closed. The power supply is provided by the connection end of the mechanical switch K1 and the load RL1, which has the advantages of not affecting the insulation withstand voltage at both ends of the mechanical switch K1, and has the advantages of no leakage current when the mechanical switch K1 is normally open. The control unit C stores an adaptive control program, a...
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