CN216248113U - Opening and closing current collecting circuit of circuit breaker - Google Patents
Opening and closing current collecting circuit of circuit breaker Download PDFInfo
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- CN216248113U CN216248113U CN202121844229.5U CN202121844229U CN216248113U CN 216248113 U CN216248113 U CN 216248113U CN 202121844229 U CN202121844229 U CN 202121844229U CN 216248113 U CN216248113 U CN 216248113U
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- power supply
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Abstract
The utility model discloses a switching-on and switching-off current acquisition circuit of a circuit breaker, which comprises a Hall sensor, a sampling resistor and an anti-reverse diode, wherein the Hall sensor is connected with the sampling resistor; the Hall sensor is provided with an input end, an output end and a sampling end; the anode of the reverse connection prevention diode is connected with the anode of the first direct current power supply, and the cathode of the reverse connection prevention diode is connected with the input end of the Hall sensor; the output end of the Hall sensor is connected with one end of a switching-on and switching-off coil of the circuit breaker, and the other end of the switching-on and switching-off coil of the circuit breaker is connected with the negative electrode of a first direct current power supply through a switching device; when the switching device is switched on to enable the opening and closing coil of the circuit breaker to be electrified, the sampling end of the Hall sensor can output induction current according to a certain proportion, and the induction current is transmitted to an external processing module to realize the collection of the opening and closing current; the sampling end of the Hall sensor is also grounded through a sampling resistor. The utility model can collect and monitor the switching-on and switching-off current waveform in real time, and has high collection sensitivity and good safety.
Description
Technical Field
The utility model relates to the field of switch equipment, in particular to a switching-on and switching-off current acquisition circuit of a circuit breaker.
Background
The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. The circuit breaker can be used for distributing electric energy and protecting a power supply line, a motor and the like, and the operation performance of the circuit breaker is important to the safety and stability of a power grid. When a fault occurs in the system, the circuit breaker can quickly cut off a fault mechanism in the system or cut off the power supply of the whole power supply so as to prevent the fault from being enlarged and avoid causing huge economic loss and casualties.
In a rail transit power supply system, the role of a direct current breaker is very important. The direct current circuit breaker in the rail transit power supply system usually utilizes an electromagnetic opening/closing coil to perform remote opening/closing. However, the existing circuit breaker lacks a means for collecting the opening and closing current of the circuit breaker, so that the information is difficult to accurately acquire and process; the existing current acquisition circuit also has the problems that the sensitivity and the safety can not meet the requirements and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the background art, the present invention provides a switching-on/off current collecting circuit of a circuit breaker.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a switching-on and switching-off current acquisition circuit of a circuit breaker comprises a Hall sensor, a sampling resistor and an anti-reverse diode;
the Hall sensor is provided with an input end, an output end and a sampling end;
the anode of the reverse connection prevention diode is connected with the anode of a first direct current power supply, and the cathode of the reverse connection prevention diode is connected with the input end of the Hall sensor;
the output end of the Hall sensor is respectively connected with one end of each opening coil and one end of each closing coil of the circuit breaker, and the other end of each opening coil and the other end of each closing coil of the circuit breaker are connected with the negative electrode of the first direct current power supply through a switching device;
when the switching device is switched on to enable the opening coil or the closing coil of the circuit breaker to be electrified, the sampling end of the Hall sensor can output induction current according to a certain proportion, and the induction current is transmitted to an external processing module to realize the collection of the opening and closing current;
the sampling end of the Hall sensor is also grounded through the sampling resistor.
In some embodiments, the Hall sensor is model LA25-NP, and the sampling end of the Hall sensor outputs induction current according to the ratio of 1000: 1.
In some embodiments, the first dc power supply is a 110V dc power supply; the Hall sensor is also provided with two power supply input ends, the two power supply input ends are respectively connected with the positive pole and the negative pole of a 15V direct-current power supply, the positive pole and the negative pole of the 15V direct-current power supply are also respectively connected with one ends of a first capacitor and a second capacitor, and the other ends of the first capacitor and the second capacitor are grounded.
In some embodiments, the device further comprises a third capacitor, a piezoresistor, a third resistor, a fourth resistor, a fifth resistor and a bidirectional transient diode;
the third capacitor is connected with the piezoresistor in parallel, one end of the third capacitor and one end of the piezoresistor are both connected with the cathode of the reverse connection prevention diode, and the other ends of the third capacitor and the piezoresistor are both connected with the cathode of the direct current power supply;
one end of the third resistor is connected with the cathode of the reverse connection prevention diode, and the other end of the third resistor is respectively connected with the fourth resistor, the fifth resistor and one end of the bidirectional transient diode;
and the other ends of the fourth resistor and the bidirectional transient diode are both connected with the cathode of the direct-current power supply.
In some embodiments, the number of the reverse-connection preventing diodes is two, and the two reverse-connection preventing diodes are connected in parallel.
Compared with the prior art, the utility model has the beneficial effects that:
according to the switching-on and switching-off current acquisition circuit of the circuit breaker, the Hall sensor is connected in series to the switching-on and switching-off circuit, the protection filtering structure is additionally arranged in the circuit, the switching-on and switching-off current waveform can be acquired and monitored in real time, and the acquisition sensitivity is high and the safety is good.
Drawings
Fig. 1 is a circuit schematic diagram of a switching-on/off current collecting circuit of a circuit breaker provided by the utility model.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the utility model easy to understand, the following description further explains how the utility model is implemented by combining the attached drawings and the detailed implementation modes.
Referring to fig. 1, the utility model provides a switching-on and switching-off current acquisition circuit of a circuit breaker, which comprises a hall sensor U1, a sampling resistor R1 and an anti-reverse diode V1; the Hall sensor U1 is provided with an input end, an output end and a sampling end; the anode of the reverse connection prevention diode V1 is connected with the anode of the first direct current power supply, and the cathode of the reverse connection prevention diode V1 is connected with the input end of the Hall sensor U1; the output end of the Hall sensor U1 is respectively connected with one end of each opening coil and one end of each closing coil of the circuit breaker, and the other end of each opening coil and the other end of each closing coil of the circuit breaker are connected with the negative electrode of the first direct current power supply through a switching device; when the switching device is switched on to enable the opening coil or the closing coil of the circuit breaker to be electrified, the sampling end of the Hall sensor U1 can output induction current according to a certain proportion, and the induction current is transmitted to an external processing module to realize the collection of opening and closing current; the sampling end of the Hall sensor U1 is also grounded through a sampling resistor R1.
In one embodiment, as shown, the Hall sensor U1 is model LA25-NP, and the sampling terminal of the Hall sensor U1 outputs an induced current in a ratio of 1000: 1.
Further, the first direct current POWER supply adopts a 110V direct current POWER supply, the anode of the direct current POWER supply is represented as 110POWER in the figure, and the cathode of the direct current POWER supply is represented as DC 110-; the DC110+ represents the voltage at the output end of the Hall sensor U1, and the DC110+ end is directly connected with one end of a switching-on/off coil of the circuit breaker; it is understood that the hall sensor U1 is used for sampling, and the voltage at the input and output terminals thereof hardly changes, and the DC110+ and 110POWER are shown only for distinguishing the two different terminals.
The external power supply is input by pins 1 and output by pins 6 of LA25-NP Hall sensor U1, pins 2-5 can be connected with pins 1, and pins 7-10 can be connected with pins 6; the pin 11 is used as a sampling end, the current is converted into a low-voltage analog signal after being sampled, the low-voltage analog signal is output by an Ai + end in the figure, and the low-voltage analog signal can be directly collected by an external signal conditioning board and is processed in real time; the LA25-NP hall sensor U1 further has two power supply input terminals, that is, pins 12 and 13, the two power supply input terminals are respectively connected to the positive electrode and the negative electrode of a 15V dc power supply, the positive electrode and the negative electrode of the 15V dc power supply are further respectively connected to one end of the first capacitor C1 and one end of the second capacitor C2, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded.
Preferably, the circuit further comprises a third capacitor C3, a voltage dependent resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a bidirectional transient diode D1; the third capacitor C3 is connected with the piezoresistor in parallel, one end of the third capacitor C3 and one end of the piezoresistor R2 are both connected with the cathode of the anti-reverse diode V1, and the other end of the third capacitor C3 and the other end of the piezoresistor R2 are both connected with the cathode of the direct-current power supply; one end of the third resistor R3 is connected with the cathode of the anti-reverse diode V1, and the other end is respectively connected with one end of the fourth resistor R4, one end of the fifth resistor R5 and one end of the bidirectional transient diode D1; the other ends of the fourth resistor R4 and the bidirectional transient diode D1 are both connected with the negative electrode of the direct-current power supply; the other end of the fifth resistor R5, the Uin + end in the figure, may be connected to an external voltage acquisition circuit.
In addition, the quantity of the reverse connection prevention diodes V1 is two, the two reverse connection prevention diodes V1 are connected in parallel, and the reverse connection prevention diode V1 can effectively avoid the burning of a rear-stage circuit caused by reverse connection of a power supply. The third capacitor C3 may be a film capacitor with a rated voltage of 400V for noise filtering. The piezoresistor R2 is used for protecting the rear-stage circuit. The bidirectional transient diode D1 may be model SMBJ15 CA.
In conclusion, the switching-on and switching-off current acquisition circuit of the circuit breaker, provided by the utility model, has the advantages that the Hall sensor is connected in series to the switching-on and switching-off circuit, the protection filtering structure is additionally arranged in the circuit, the switching-on and switching-off current waveform can be acquired and monitored in real time, the acquisition sensitivity is high, and the safety is good.
Finally, the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, which should be covered by the claims of the present invention.
Claims (5)
1. A switching-on and switching-off current acquisition circuit of a circuit breaker is characterized by comprising a Hall sensor (U1), a sampling resistor (R1) and an anti-reverse diode (V1);
the Hall sensor (U1) is provided with an input end, an output end and a sampling end;
the anode of the reverse connection prevention diode (V1) is connected with the anode of a first direct current power supply, and the cathode of the reverse connection prevention diode (V1) is connected with the input end of the Hall sensor (U1);
the output end of the Hall sensor (U1) is respectively connected with one end of each opening coil and one end of each closing coil of the circuit breaker, and the other end of each opening coil and the other end of each closing coil of the circuit breaker are connected with the negative electrode of the first direct-current power supply through a switching device;
the model of the Hall sensor (U1) is LA 25-NP;
the sampling end of the Hall sensor (U1) is connected with an external processing module, and the sampling end of the Hall sensor (U1) is grounded through the sampling resistor (R1).
2. The switching-on and switching-off current acquisition circuit of the circuit breaker according to claim 1, wherein a sampling end of the hall sensor (U1) outputs an induced current according to a ratio of 1000: 1.
3. The switching-on and switching-off current collection circuit of a circuit breaker according to claim 2, wherein said first dc power supply is a 110V dc power supply; the Hall sensor (U1) is further provided with two power supply input ends, the two power supply input ends are respectively connected with the positive electrode and the negative electrode of a 15V direct-current power supply, the positive electrode and the negative electrode of the 15V direct-current power supply are further respectively connected with one end of a first capacitor (C1) and one end of a second capacitor (C2), and the other ends of the first capacitor (C1) and the second capacitor (C2) are grounded.
4. The switching-closing and switching-on current collection circuit of circuit breaker according to claim 1, characterized by further comprising a third capacitor (C3), a voltage dependent resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5) and a bidirectional transient diode (D1);
the third capacitor (C3) is connected with the piezoresistor in parallel, one end of the third capacitor (C3) and one end of the piezoresistor (R2) are both connected with the cathode of the anti-reverse diode (V1), and the other ends are both connected with the cathode of the direct current power supply;
one end of the third resistor (R3) is connected with the cathode of the reverse connection prevention diode (V1), and the other end of the third resistor (R3) is respectively connected with one end of a fourth resistor (R4), a fifth resistor (R5) and one end of a bidirectional transient diode (D1);
the other end of the fourth resistor (R4) and the other end of the bidirectional transient diode (D1) are both connected with the cathode of the direct current power supply.
5. The switching-closing and switching-on current collecting circuit of circuit breaker according to claim 1, characterized in that the number of said reverse-connection preventing diodes (V1) is two, and two reverse-connection preventing diodes (V1) are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121844229.5U CN216248113U (en) | 2021-08-09 | 2021-08-09 | Opening and closing current collecting circuit of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121844229.5U CN216248113U (en) | 2021-08-09 | 2021-08-09 | Opening and closing current collecting circuit of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216248113U true CN216248113U (en) | 2022-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121844229.5U Active CN216248113U (en) | 2021-08-09 | 2021-08-09 | Opening and closing current collecting circuit of circuit breaker |
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| Country | Link |
|---|---|
| CN (1) | CN216248113U (en) |
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2021
- 2021-08-09 CN CN202121844229.5U patent/CN216248113U/en active Active
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