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A DC switch arc extinguishing device suitable for high power

A technology of a DC switch and an arc extinguishing device, which is applied to emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problems of small size and low cost, and achieve small size. , low cost, obvious effect of energy saving

Active Publication Date: 2020-09-15
尹向阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The high-voltage and high-current occasions mentioned above all require the application of high-power DC switches. If the switch needs to break 1500V and arcs with a current of 1500-2000A, if no measures are taken, these arcs can be stretched to 2 meters long and still continue to burn. Arc extinguishing is a problem that must be solved for high-voltage DC switches. There is no technical solution that is small in size, low in cost and energy-saving in the prior art

Method used

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  • A DC switch arc extinguishing device suitable for high power
  • A DC switch arc extinguishing device suitable for high power
  • A DC switch arc extinguishing device suitable for high power

Examples

Experimental program
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Effect test

no. 1 example

[0039] image 3 Shown is the schematic diagram of the first embodiment of the present invention, which is suitable for high-power DC switch arc extinguishing device including: DC switch J1, DC switch J2, diode D1 and diode D2; DC switch J1 is connected to the DC input positive Vin+ and DC output positive Vout+, DC switch J2 is connected between DC input negative Vin- and DC output negative Vout-; the anode of diode D1 is connected to the connection point of DC switch J2 and DC output negative Vout-, and the cathode of diode D1 is connected to The DC input is positive Vin+; the anode of the diode D2 is connected to the DC input negative Vin-, and the cathode of the diode D2 is connected to the connection point of the DC switch J1 and the DC output positive Vout+.

[0040] When the DC circuit works normally, both the DC switch J1 and the DC switch J2 are closed, and the diode D1 and the diode D2 are cut off due to reverse bias, and the current flow direction in the circuit is: D...

no. 2 example

[0053] Figure 5 It is the principle diagram of the second embodiment of the present invention, compared figure 1 The difference is that a series circuit composed of a resistor R1 and a capacitor C1 is connected in parallel at both ends of the DC switch J1, and a series circuit composed of a resistor R2 and a capacitor C2 is connected in parallel at both ends of the DC switch J2.

[0054] It should be noted that the positions of the resistor R1 and the capacitor C1 can be exchanged, and the positions of the resistor R2 and the capacitor C2 can also be exchanged, which is equivalent to an RC series device after exchanging positions, which is common knowledge for those skilled in the art .

[0055] From t1 to t2, the current in the DC switch J1 is shunted through the RC buffer branch composed of the resistor R1 and the capacitor C1, which reduces the burden on the DC switch J1 and suppresses du / dt and overvoltage. At t2, the diode D2 conducts After passing through, the current...

no. 3 example

[0059] Figure 6 It is the principle diagram of the third embodiment of the present invention, compared Figure 5 The difference is that a capacitor C3 is connected in parallel at both ends of the diode D1, and a capacitor C4 is connected in parallel at both ends of the diode D2.

[0060] From t1 to t2, a charging current will be formed in the capacitor C3 and capacitor C4, which will accelerate the absorption of the current in the DC switches J1 and J2, so that the current in the DC switches J1 and J2 will decrease, and the arc intensity will decrease, further suppressing du / dt And overvoltage, so that the reverse voltage of diodes D1 and D2 will not be too large and be damaged by breakdown; when diodes D2 and D1 are turned on at t2 to form a absorption loop, capacitors C3 and capacitors C4 begin to discharge.

[0061]In this embodiment, there are certain problems in the process of switching on: when the DC switch J1 is turned from off to on, the capacitor C4 is directly con...

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PUM

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Abstract

A direct current switch arc-extinguishing device suitable for high power, comprising: a first direct current switch (J1), a second direct current switch (J2), a first diode (D1), and a second diode (D2); the first direct current switch (J1) is connected between a direct current positive input (Vin+) and a direct current positive output (Vout+), and the second direct current switch (J2) is connected between a direct current negative input (Vin-) and a direct current negative output (Vout-); the anode of the first diode (D1) is connected to the connection point between the second direct current switch (J2) and the direct current negative output (Vout-), and the cathode of the first diode (D1) is connected to the direct current positive input (Vin+); and the anode of the second diode (D2) is connected to the direct current negative input (Vin-), and the cathode of the second diode (D2) is connected to the connection point between the first direct current switch (J1) and the direct current positive output (Vout+). By means of the present invention, the current in an inductor (L) cannot change abruptly, a new path is sought for continuous flowing of the current by means of the first diode (D1) and the second diode (D2), and linkage is turned off so that the freewheeling path may implement energy being fed back to a direct current circuit, thereby achieving lossless recovery of energy; in addition, the device has a simple circuit, is easy to implement, has a small volume, and is low cost.

Description

technical field [0001] The invention relates to a switch arc extinguishing device, in particular to a DC switch arc extinguishing device suitable for high power. The DC switch includes a mechanical DC circuit breaker, a solid DC circuit breaker, a hybrid DC circuit breaker and other DC switches. Background technique [0002] Existing simplified models of power systems such as figure 1 As shown, all of them are composed of DC input Vin+ and Vin-, switch J, DC output Vout+ and Vout-, and load L in series. The basic function of switch J is to open and close the circuit in a short time as required. When the current circuit is cut off, as long as the power supply voltage is greater than 10-20V and the current is greater than 80-100mA, at the moment when the moving and static contacts are separated, a mass of extremely high temperature, strong light and conductive approximation will be generated in the gap between the contacts. The cylindrical gas, which is the arc, is not interr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H9/04
CPCH02H9/02H02H9/04
Inventor 尹向阳
Owner 尹向阳