Fast circuit breaker driving device based on thin-film capacitor

Abstract

The utility model provides a fast circuit breaker driving device based on a thin-film capacitor, which comprises a signal receiving circuit, an electromagnetic control circuit and an energy charging circuit, and is characterized in that the signal receiving circuit receives a high-level control signal and sends the signal to the electromagnetic control circuit, and when the electromagnetic control circuit receives the control signal, the energy charging circuit charges the electromagnetic control circuit. By utilizing the characteristics of energy storage and rapid discharge of the capacitor, the circuit forms a closed loop by conducting an MOS (Metal Oxide Semiconductor) tube and releasing the charged current of the capacitor, the electromagnetic coil generates a magnetic field, the circuit breaker contact is tripped by utilizing the repulsive force of the homopolar magnetic field generated by the two electromagnetic control loops, and the energy charging circuit is used for charging the capacitor and providing power.

Description

Technical Field

[0001] The utility model belongs to the technical field of fast circuit breaker driving devices, and in particular relates to a fast circuit breaker driving device based on a film capacitor. Background Art

[0002] Fast circuit breakers are usually used to quickly cut off the current in a circuit to protect other components or equipment in the circuit from damage caused by current overload or short circuit, ensuring the stability and safety of the system. The driving device of the circuit breaker is an important device for the fast disconnection of the fast circuit breaker.

[0003] A circuit breaker tripping device provided by publication number CN110137046A has an internal driving device that connects an electromagnetic coil in series to a circuit, and generates magnetic force to drive the circuit breaker to trip through current changes in the circuit. However, this method has a slow response speed and requires a large current change to work. According to the characteristics of capacitor energy storage and fast current release, discharging the energy-storing capacitor to the electromagnetic coil can greatly increase the instantaneous current of the electromagnetic coil and increase the tripping speed. Film capacitors have the characteristics of long life, wide temperature range, and excellent self-healing properties to ensure stable operation of the device, and are very suitable for driving electromagnetic wires. Summary of the invention

[0004] The purpose of the utility model is to provide a fast circuit breaker driving device based on a film capacitor to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A fast circuit breaker driving device based on a film capacitor, comprising:

[0007] A signal receiving circuit, one end of which is electrically connected to the trip signal source, and the other end of which is electrically connected to the electromagnetic control circuit, for receiving a high-level control signal from the trip signal source and transmitting it to the electromagnetic control circuit;

[0008] An electromagnetic control circuit, one end of which is electrically connected to the signal receiving circuit, and the other end of which is connected to the charging circuit, so that the electromagnetic control circuit switches on the electromagnetic control loop under the high-level control signal of the signal receiving circuit after the charging circuit is charged;

[0009] A charging circuit, one end of which is electrically connected to the electromagnetic control circuit, and the other end of which is connected to a power supply, is used to charge the capacitor of the electromagnetic control circuit.

[0010] In one embodiment, the signal receiving circuit includes a resistor R1 and a capacitor C1, the resistor R1 and C1 are connected in parallel, one end of the parallel connection is electrically connected to the trip signal source, and the other end is electrically connected to the gate of the MOS tube Q1 and the gate of the MOS tube Q2.

[0011] In one embodiment, the electromagnetic control circuit includes two electromagnetic control loops, the first control loop includes a MOS tube Q1, a diode D1, a resistor R2, a capacitor C2, and an electromagnetic coil L1, and is used to form a current loop when the MOS tube Q1 is turned on, so that the electromagnetic coil L1 generates a magnetic field force, the drain of the MOS tube Q1 is electrically connected to the cathode of the diode D1, the source is electrically connected to one end of the electromagnetic coil L1, the other end of the diode D1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is electrically connected to one end of the capacitor C2, and the other end of the capacitor C2 is electrically connected to The other end of the electromagnetic coil L1 is electrically connected, and the second control loop includes a MOS tube Q2, a diode D3, a resistor R3, a capacitor C3, and an electromagnetic coil L2, which is used to form a current loop when the MOS tube Q2 is turned on, so that the electromagnetic coil L2 generates a magnetic field force. The drain of the MOS tube Q2 is electrically connected to the cathode of the diode D3, and the source is electrically connected to one end of the electromagnetic coil L2. The other end of the diode D3 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to one end of the capacitor C3, and the other end of the capacitor C3 is electrically connected to the other end of the electromagnetic coil L2.

[0012] In one embodiment, the charging circuit is composed of two diodes D2 and D4, two voltage regulator tubes Z1 and Z2, and a positive power terminal and a negative power terminal. The cathode of the diode D2 is electrically connected to one end of the resistor R2 and one end of the capacitor C2, and the anode is electrically connected to the anode of the voltage regulator tube, the positive power terminal, the anode of the voltage regulator tube Z2, and the anode of the diode D4. The cathode of the voltage regulator tube Z1 is electrically connected to one end of the capacitor C2, one end of the electromagnetic coil L1, the negative power terminal, one end of the capacitor C2, and one end of the electromagnetic coil L2.

[0013] In one embodiment, the electromagnetic coil L1 and the electromagnetic coil L2 are installed relative to each other according to magnetic fields with the same polarity.

[0014] The beneficial effects of the utility model are:

[0015] The utility model receives a high-level control signal through a signal receiving circuit and sends the signal to an electromagnetic control circuit. When the electromagnetic control circuit receives the control signal, the characteristics of capacitor energy storage and rapid discharge are utilized to release the current of the charged capacitor by turning on the MOS tube, so that the circuit forms a closed loop. The same-polar magnetic field generated by two electromagnetic control loops and the repulsive force of the same-polar magnetic field are utilized to trip the circuit breaker contacts. The charging circuit is used to charge the capacitor and provide power. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model.

[0017] In the figure: 10 signal receiving circuit, 20 electromagnetic control circuit, 30 charging circuit. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example:

[0020] See also Figure 1 , the utility model provides a technical solution:

[0021] A fast circuit breaker driving device based on a film capacitor includes a signal receiving circuit 10, an electromagnetic control circuit 20, and a charging circuit 30, wherein:

[0022] One end of the signal receiving circuit 10 is electrically connected to the trip signal source, and the other end is electrically connected to the electromagnetic control circuit 20 , so as to receive the high-level control signal from the trip signal source and transmit it to the electromagnetic control circuit 20 .

[0023] Furthermore, the signal receiving circuit 10 includes a resistor R1 and a capacitor C1, wherein the resistor R1 is a low-resistance resistor of model RL0603JR, and the capacitor is a J-type thin film capacitor of model CBB81221. The resistor R1 is connected in parallel with C1, one end of the parallel connection is electrically connected to the trip signal source, and the other end is electrically connected to the gate of the MOS tube Q1 and the gate of the MOS tube Q2. Since the capacitor has no resistance in the initial state, the high-level pulse signal first passes through the capacitor C1 to reach the gates of the MOS tubes Q1 and Q2, thereby accelerating the transmission of the signal.

[0024] One end of the electromagnetic control circuit 20 is electrically connected to the signal receiving circuit 10, and the other end is connected to the charging circuit 30, so that the electromagnetic control circuit 20 can connect the electromagnetic control loop under the high-level control signal of the signal receiving circuit 10 after the charging circuit 30 is charged.

[0025] Furthermore, the electromagnetic control circuit 20 includes two electromagnetic control loops. The first control loop includes a MOS tube Q1, a diode D1, a resistor R2, a capacitor C2, and an electromagnetic coil L1, which is used to form a current loop when the MOS tube Q1 is turned on, so that the electromagnetic coil L1 generates a magnetic field force. The MOS tube Q1 adopts a MOS tube with a model of FQPF18N60C. The drain of the MOS tube Q1 is electrically connected to the cathode of the diode D1, and the source is electrically connected to one end of the electromagnetic coil L1. The diode D1 adopts a diode with a model of 1N4007. The other end of the diode D1 is electrically connected to one end of the resistor R2. The resistor R2 adopts a low-resistance resistor with a model of RL0603JR. The other end of the resistor R2 is electrically connected to one end of the capacitor C2. The capacitor C2 adopts a thin film capacitor with a model of CBB81682J. The other end of the capacitor C2 is electrically connected to the cathode of the diode D1. The other end of the magnetic coil L1 is electrically connected. The second control loop includes a MOS tube Q2, a diode D3, a resistor R3, a capacitor C3, and an electromagnetic coil L2. When the MOS tube Q2 is turned on, a current loop is formed to enable the electromagnetic coil L2 to generate a magnetic field force. The MOS tube Q2 adopts a MOS tube with a model of FQPF18N60C. The drain of the MOS tube Q2 is electrically connected to the cathode of the diode D3, and the source is electrically connected to one end of the electromagnetic coil L2. The diode D3 adopts a diode with a model of 1N4007. The other end of the diode D3 is electrically connected to one end of the resistor R3. The resistor R3 adopts a low-resistance resistor with a model of RL0603JR. The other end of the resistor R3 is electrically connected to one end of the capacitor C3. The capacitor C3 adopts a film capacitor with a model of CBB81682J. The other end of the capacitor C2 is electrically connected to the other end of the electromagnetic coil L2.

[0026] Furthermore, the electromagnetic coil L1 and the electromagnetic coil L2 are installed relative to each other according to magnetic fields with the same polarity direction.

[0027] The high-level pulse signal passes through the gate of the MOS tube to turn on the MOS tube. The MOS tube is used to realize the conduction and cutoff of the control loop under the high-level control signal. After the two control loops are turned on, the current passes from the positive electrode of the capacitor through the resistor, the diode, the MOS tube to the electromagnetic coil. The resistor is used to limit the discharge speed of the capacitor to protect the safety of the control loop. The diode is used to prevent vibration. The electromagnetic coil generates magnetic force. The two magnetic forces repel each other to trip the circuit breaker.

[0028] One end of the charging circuit 30 is electrically connected to the electromagnetic control circuit 20 , and the other end is connected to a power source, so as to charge the capacitor of the electromagnetic control circuit 20 .

[0029] Furthermore, the charging circuit 30 is composed of two diodes D2 and D4, two voltage regulator tubes Z1 and Z2, and a positive terminal and a negative terminal of a power supply. The two diodes are 1N4007 diodes, and the other voltage regulator tube is 1N4750A. The cathode of the diode D2 is electrically connected to one end of the resistor R2 and one end of the capacitor C2, and the anode is electrically connected to the anode of the voltage regulator tube, the positive terminal of the power supply, the anode of the voltage regulator tube Z2, and the anode of the diode D4. The cathode of the voltage regulator tube Z1 is electrically connected to one end of the capacitor C2, one end of the electromagnetic coil L1, the negative terminal of the power supply, one end of the capacitor C2, and one end of the electromagnetic coil L2.

[0030] When using direct current to charge capacitors C2 and C3, the current passes through the diodes to charge the capacitors. When using alternating current, diodes D2 and D4 convert the alternating current into direct current to charge the capacitors.

[0031] The use principle of the utility model: the utility model receives a high-level control signal through a signal receiving circuit and sends the signal to an electromagnetic control circuit. When the electromagnetic control circuit receives the control signal, it utilizes the characteristics of capacitor energy storage and rapid discharge to release the current of the charged capacitor by turning on the MOS tube, so that the circuit forms a closed loop. The electromagnetic coil generates a magnetic field, and the same-polar magnetic field generated by two electromagnetic control circuits utilizes the repulsive force of the same-polar magnetic field to trip the circuit breaker contacts. The charging circuit is used to charge the capacitor and provide power.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fast circuit breaker driving device based on film capacitor, characterized in that: include: A signal receiving circuit (10), one end of the signal receiving circuit (10) being electrically connected to a trip signal source, and the other end of the signal receiving circuit (10) being electrically connected to an electromagnetic control circuit (20), and being used for receiving a high-level control signal from the trip signal source and transmitting the signal to the electromagnetic control circuit (20); An electromagnetic control circuit (20), one end of the electromagnetic control circuit (20) being electrically connected to the signal receiving circuit (10), and the other end being connected to the charging circuit (30), and being used for connecting the electromagnetic control circuit in the electromagnetic control circuit (20) under the high-level control signal of the signal receiving circuit (10) after the charging of the charging circuit (30) is completed; A charging circuit (30), one end of the charging circuit (30) is electrically connected to the electromagnetic control circuit (20), and the other end is connected to a power source, and is used to charge the capacitor of the electromagnetic control circuit (20).

2. A fast circuit breaker driving device based on film capacitor according to claim 1, characterized in that: The signal receiving circuit (10) comprises a resistor R1 and a capacitor C1, wherein the resistor R1 and the capacitor C1 are connected in parallel, one end of the parallel connection is electrically connected to a trip signal source, and the other end is electrically connected to the gate of the MOS tube Q1 and the gate of the MOS tube Q2.

3. A fast circuit breaker driving device based on film capacitor according to claim 1, characterized in that: The electromagnetic control circuit (20) comprises two electromagnetic control loops, wherein the first control loop comprises a MOS tube Q1, a diode D1, a resistor R2, a capacitor C2, and an electromagnetic coil L1, and is used to form a current loop when the MOS tube Q1 is turned on, so that the electromagnetic coil L1 generates a magnetic field force, wherein the drain of the MOS tube Q1 is electrically connected to the cathode of the diode D1, the source is electrically connected to one end of the electromagnetic coil L1, the other end of the diode D1 is electrically connected to one end of the resistor R2, the other end of the resistor R2 is electrically connected to one end of the capacitor C2, and the other end of the capacitor C2 is electrically connected to the electromagnetic coil The other end of the coil L1 is electrically connected, and the second control loop includes a MOS tube Q2, a diode D3, a resistor R3, a capacitor C3, and an electromagnetic coil L2, which is used to form a current loop when the MOS tube Q2 is turned on, so that the electromagnetic coil L2 generates a magnetic field force. The drain of the MOS tube Q2 is electrically connected to the cathode of the diode D3, and the source is electrically connected to one end of the electromagnetic coil L2. The other end of the diode D3 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to one end of the capacitor C3, and the other end of the capacitor C3 is electrically connected to the other end of the electromagnetic coil L2.

4. A fast circuit breaker driving device based on film capacitor according to claim 1, characterized in that: The charging circuit (30) is composed of two diodes D2 and D4, two voltage regulator tubes Z1 and Z2, and a positive terminal and a negative terminal of a power supply. The cathode of the diode D2 is electrically connected to one end of the resistor R2 and one end of the capacitor C2, and the anode is electrically connected to the anode of the voltage regulator tube, the positive terminal of the power supply, the anode of the voltage regulator tube Z2, and the anode of the diode D4. The cathode of the voltage regulator tube Z1 is electrically connected to one end of the capacitor C2, one end of the electromagnetic coil L1, the negative terminal of the power supply, one end of the capacitor C2, and one end of the electromagnetic coil L2.

5. A fast circuit breaker driving device based on film capacitor according to claim 3, characterized in that: The electromagnetic coil L1 and the electromagnetic coil L2 are installed relative to each other according to the magnetic field in the same polarity direction.

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