CN217769475U - Direct current-limiting circuit breaker turn-off capacitor charging voltage stabilizing circuit - Google Patents
Direct current-limiting circuit breaker turn-off capacitor charging voltage stabilizing circuit Download PDFInfo
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- CN217769475U CN217769475U CN202221003215.5U CN202221003215U CN217769475U CN 217769475 U CN217769475 U CN 217769475U CN 202221003215 U CN202221003215 U CN 202221003215U CN 217769475 U CN217769475 U CN 217769475U
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Abstract
The utility model discloses a direct current-limiting circuit breaker turn-offs electric capacity voltage stabilizing circuit that charges. The circuit comprises a relay K, a transformer T, a rectifier bridge D, a charging resistor R, a capacitor voltage detection unit and a relay control unit; one end of the relay K is connected with an alternating current power supply, the other end of the relay K is connected with the transformer T, alternating current output by the transformer T is rectified into direct current through the rectifier bridge D and then charges the capacitor C through the charging resistor R, the two ends of the capacitor C are provided with capacitance voltage detection units, and the relay control unit is electrically connected with the relay and the capacitance voltage detection units. The utility model discloses in, electric capacity voltage detection unit detects electric capacity voltage, passes electric capacity voltage signal to relay control unit, and relay control unit sends relay disconnection, closed signal according to electric capacity voltage signal to realize that electric capacity voltage is stable at predetermineeing the within range. The utility model discloses the circuit is simple, response speed is fast, the reliability is high, realizes the automatic steady voltage function of direct current-limiting circuit breaker.
Description
Technical Field
The utility model relates to a direct current-limiting circuit breaker technical field especially relates to a direct current-limiting circuit breaker turn-offs electric capacity voltage stabilizing circuit that charges.
Background
The direct current limiting circuit breaker is widely applied to a direct current power system due to the advantages of strong current limiting capacity, short breaking time and the like. With the continuous development of the dc power system, higher requirements are put on the dc limiting circuit breaker.
The direct current limiting circuit breaker mainly comprises a high-speed vacuum switch, a turn-off circuit and an energy-absorbing piezoresistor. And (4) normally working, closing the high-speed vacuum switch and enabling current to flow through the vacuum switch. When the direct current is cut off, the vacuum switch is firstly opened, and then the corresponding cut-off capacitor sends out forced cut-off current according to the current direction of the system, so that the current on the vacuum switch is forced to be cut off in a zero-crossing way. The turn-off circuit mainly comprises a diode, an inductor, a thyristor and a capacitor, and the voltage of the capacitor has a large influence on the breaking performance of the direct current limiting circuit breaker. The traditional direct current limiting circuit breaker generally charges a turn-off capacitor by power frequency input voltage through a transformer and a current limiting resistor, the capacitor voltage is greatly fluctuated by the voltage of a power grid, the fluctuation range reaches +/-20 percent, the capacitor voltage fluctuation is large, and the breaking performance of the circuit breaker can be influenced when the capacitor voltage is too high or too low. Therefore, the design of the voltage stabilizing circuit for switching off the capacitor charging of the direct current limiting circuit breaker has great significance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a circuit is simple, response speed is fast, the direct current-limiting circuit breaker of reliability height and automatic voltage stabilization turn-offs electric capacity voltage stabilizing circuit that charges to the above-mentioned not enough of prior art.
The utility model discloses a direct current-limiting circuit breaker turn-off capacitor charging voltage stabilizing circuit, which comprises a relay K, a transformer T, a rectifier bridge D, a charging resistor R, a capacitor voltage detection unit and a relay control unit; the one end of relay K with be connected alternating current power supply, transformer T is connected to the other end, the alternating current of transformer T output is the direct current through rectifier bridge D rectification, charges for condenser C through charging resistor R again, and condenser C's both ends are equipped with the capacitance voltage detection unit who is used for detecting its capacitance voltage, relay control unit with relay and capacitance voltage detection unit electricity are connected.
Further, the capacitance voltage detection unit includes sampling resistor R1 ~ R10, divider resistance R11, keeps apart changer U1, 11 numbers pin and 12 numbers pin of keeping apart changer U1 are parallelly connected through two wires at condenser C's both ends, sampling resistor R1 ~ R5 are installed on one of them wire, sampling resistor R6 ~ R10 is installed on another wire, divider resistance R11 connects in parallel on two wires, 2 pins and the relay control unit of keeping apart changer U1 are connected.
Further, the relay control unit comprises a hysteresis comparator, the hysteresis comparator comprises a comparator chip U2 and resistors R12 and R13, a pin 2 of the comparator chip U2 is connected with a pin 2 of the isolation transmitter U1, a pin 3 of the comparator chip U2 is connected with a reference voltage source through a wire, the R12 is arranged on the wire, a pin 1 of the comparator chip U2 is connected with the relay K, and the R13 is connected in parallel to the pin 1 and the pin 3.
Further, the relay is a solid state relay.
Further, the transformer is a step-up transformer.
The utility model discloses in, alternating current power supply charges for electric capacity through transformer, rectifier bridge, charging resistor, and electric capacity voltage detection unit detects electric capacity voltage, passes electric capacity voltage signal to relay control unit, and relay control unit sends relay disconnection, closed signal according to electric capacity voltage to realize that electric capacity voltage is stable in the within range of presetting.
The utility model has the advantages of the circuit is simple, response speed is fast, the reliability is high, realizes the automatic steady voltage function of direct current limiting circuit breaker.
Drawings
Fig. 1 is a schematic block diagram of the switched-off capacitor charging voltage stabilizing circuit of the present invention;
FIG. 2 is a schematic diagram of the capacitor voltage detecting unit of the present invention;
fig. 3 is a schematic diagram of the relay control circuit of the present invention.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1, the utility model discloses a dc current-limiting circuit breaker turn-off capacitor charging voltage stabilizing circuit, which comprises a relay K, a transformer T, a rectifier bridge D, a charging resistor R, a capacitor voltage detecting unit and a relay control unit; one end of the relay K is connected with an alternating current power supply, the other end of the relay K is connected with the transformer T, alternating current output by the transformer T is rectified into direct current through the rectifier bridge D and then charges the capacitor C through the charging resistor R, two ends of the capacitor C are provided with capacitance voltage detection units used for detecting capacitance voltage of the capacitor C, and the relay control unit is electrically connected with the relay and the capacitance voltage detection units.
The utility model discloses in, alternating current power supply (be AC220V power frequency voltage here) charges for electric capacity through transformer, rectifier bridge, charging resistor, and electric capacity voltage detection unit detects electric capacity voltage, passes electric capacity voltage signal to relay control unit, and relay control unit sends relay disconnection, closed signal according to electric capacity voltage signal to realize that electric capacity voltage is stable in preset's within range.
As shown in fig. 2, the capacitance voltage detection unit may include sampling resistors R1 to R10, a voltage dividing resistor R11, and an isolation transmitter U1, where pin 11 and pin 12 of the isolation transmitter U1 are connected in parallel to two ends of the capacitor C through two wires, the sampling resistors R1 to R5 are installed on one of the wires, the sampling resistors R6 to R10 are installed on the other wire, the voltage dividing resistor R11 is connected in parallel to the two wires, and pin 2 of the isolation transmitter U1 is connected to the relay control unit; the capacitor voltage at two ends of the capacitor obtains a low voltage with a certain transformation ratio through the sampling resistor and the divider resistor, then obtains a voltage signal Vc through the isolation transmitter U1, and sends the voltage signal Vc to the relay control unit.
As shown in fig. 3, the relay control unit may include a hysteresis comparator, the hysteresis comparator includes a comparator chip U2 and resistors R12 and R13, a pin 2 of the comparator chip U2 is connected to a pin 2 of the isolation transmitter U1, a pin 3 of the comparator chip U2 is connected to the reference voltage source through a wire, R12 is disposed on the wire, a pin 1 of the comparator chip U2 is connected to the relay K, and R13 is connected in parallel to the pin 1 and the pin 3. The comparator chip U2 performs signal operation on the received voltage signal Vc and the voltage of the hysteresis comparator circuit to obtain a relay control signal U with a certain rule charge And the relay is controlled, so that the function of stabilizing the capacitor voltage is realized. The comparator chip U2 is a commercially available product, for example: can be LM339, LM393, etc.
In the above circuit, the voltage stabilizing range of the capacitor is related to the upper threshold voltage UTH and the lower threshold voltage UTL of the hysteresis comparator circuit, and it is assumed that the sampling ratio is 100:1, the capacitor voltage stabilizing range is 100U TH ～100U TL . The threshold voltage is determined by the output voltage U of the hysteresis comparator and the reference voltage Vref, and is specifically calculated as follows:
U TH ＝(R12/(R12+R13))*U charge +(R1/(R12+R13))*U ref ；
U TH ＝(R12/(R12+R13))*(-U charge )+(R12/(R12+R13))*U ref 。
the relay can be a solid-state relay, a non-contact switch element consisting of solid-state electronic elements has the advantages of fast conversion, high reliability and the like, and is suitable for frequent switching on and off of a capacitor charging circuit.
The transformer is a step-up transformer and converts the power frequency AC220V voltage into high voltage.
The above is not relevant and is applicable to the prior art.
Although certain specific embodiments of the present invention have been described in detail by way of illustration, it will be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention, which is to be construed as broadly as the present invention will suggest themselves to those skilled in the art to which the invention pertains and which is susceptible to various modifications or additions and similar arrangements to the specific embodiments described herein without departing from the scope of the invention as defined in the appended claims. It should be understood by those skilled in the art that any modifications, equivalent substitutions, improvements and the like made to the above embodiments according to the technical spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a direct current-limiting circuit breaker turn-off capacitance charging voltage stabilizing circuit which characterized in that: the device comprises a relay K, a transformer T, a rectifier bridge D, a charging resistor R, a capacitor C, a capacitance voltage detection unit and a relay control unit; the one end of relay K is connected alternating current power supply, and the other end is connected transformer T, the alternating current of transformer T output warp rectifier bridge D rectification is the direct current, and the warp again charging resistor R gives condenser C charges, condenser C's both ends are equipped with the capacitance voltage detection unit who is used for detecting its capacitance voltage, relay control unit with relay and capacitance voltage detection unit electricity are connected.
2. The shutdown capacitor charging voltage regulator circuit of claim 1, wherein: the capacitance voltage detection unit comprises sampling resistors R1-R10, a divider resistor R11 and an isolation transmitter U1, wherein a pin 11 and a pin 12 of the isolation transmitter U1 are connected in parallel through two wires at two ends of a capacitor C, the sampling resistors R1-R5 are installed on one of the wires, the sampling resistors R6-R10 are installed on the other wire, the divider resistor R11 is connected in parallel on the two wires, and the pin 2 of the isolation transmitter U1 is connected with a relay control unit.
3. The shutdown capacitor charging voltage regulator circuit of claim 2, wherein: the relay control unit comprises a hysteresis comparator, the hysteresis comparator comprises a comparator chip U2 and resistors R12 and R13, a pin 2 of the comparator chip U2 is connected with a pin 2 of the isolation transmitter U1, a pin 3 of the comparator chip U2 is connected with a reference voltage source through a wire, the R12 is arranged on the wire, a pin 1 of the comparator chip U2 is connected with the relay K, and the R13 is connected in parallel on the pin 1 and the pin 3.
4. The shutdown capacitor charging voltage regulator circuit of claim 1, wherein: the relay is a solid state relay.
5. The shutdown capacitor charging regulator circuit of claim 1, wherein: the transformer is a step-up transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221003215.5U CN217769475U (en) | 2022-04-24 | 2022-04-24 | Direct current-limiting circuit breaker turn-off capacitor charging voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221003215.5U CN217769475U (en) | 2022-04-24 | 2022-04-24 | Direct current-limiting circuit breaker turn-off capacitor charging voltage stabilizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769475U true CN217769475U (en) | 2022-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221003215.5U Active CN217769475U (en) | 2022-04-24 | 2022-04-24 | Direct current-limiting circuit breaker turn-off capacitor charging voltage stabilizing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217769475U (en) |
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2022
- 2022-04-24 CN CN202221003215.5U patent/CN217769475U/en active Active
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