CN217214587U

CN217214587U - Arc-free breaking circuit breaker and alternating current contactor

Info

Publication number: CN217214587U
Application number: CN202220724903.4U
Authority: CN
Inventors: 宁乐平; 姜勇
Original assignee: Quanning Times Nanjing Electric Co ltd; Nanjing Quanning Electric Co ltd
Current assignee: Quanning Times Nanjing Electric Co ltd; Nanjing Quanning Electric Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-08-16
Anticipated expiration: 2032-03-31

Abstract

The utility model discloses a circuit breaker and AC contactor that no arc divides, belong to the power control technology field, with the series voltage reduction circuit of power input voltage drop to the set voltage, the MCU supply circuit who is connected with series voltage reduction circuit, be used for converting the alternating current of input into the direct current rectifier filter circuit that is connected with the power, be connected with MCU supply circuit and be used for providing the energy storage circuit of electric energy, a power signal converting circuit for detecting input control voltage, be connected with MCU supply circuit and be used for the coil drive circuit of drive coil break-make; the utility model provides an exchange the problem of electric arc in the load on-off switching process production, and energy-efficient, through the closed and open circuit's of software time delay control electromagnetic actuator time, thereby to the contact timesharing carry out the time delay on, the disconnected control finds real electric current zero crossing, has effectively solved the galvanic corrosion problem of contact when the load switches.

Description

Arc-free breaking circuit breaker and alternating current contactor

Technical Field

The utility model belongs to the technical field of power control, concretely relates to disconnected circuit breaker of non-arc and ac contactor.

Background

The alternating current contactor is generally used in industrial control scenes of power frequency alternating current single-phase AC220V or three-phase AC380V, because the working characteristics of power frequency alternating current are that the current and the voltage are changed alternately according to relatively fixed frequency, and the voltage is relatively high, the contact can generate arcing at the moment that the electromagnetic coil controls the main loop to be switched on and off, the arcing can not only cause the serious reduction of the working life of the contact, but also cause the electromagnetic radiation interference to influence the normal work of peripheral electronic circuits and wireless communication in the arcing process, in some control application occasions of high-power inductive loads, the arcing influence is caused, the electrical life is generally only 10 percent or even less than 1 percent of the designed mechanical life, the frequent maintenance of equipment circuits and frequent production shutdown accidents are caused, the development of alternating current is carried out for more than one hundred years, and engineering designers are limited to develop and research the new material and arc extinguishing structure design of the contact for the technology of suppressing the alternating current switching on and the arcing, until now, the solution to the problem has been in the exploration and research stage, especially for the problem that the arc suppression technology of the ac contactor is an unthinkable problem in the whole industry.

The AC contactor is mainly applied to the field of power control at present, three common methods are available for power control at present, the first traditional method is that an electromagnetic maintaining contactor is used, the AC contactor is widely used at present, the AC contactor is convenient to use, a control circuit is simple, the defects are that the service life of electricity is short, the power consumption of a coil is large, the heating temperature is increased, and the urgent need of being eliminated in the development direction of the industry at present is met; the second is to use the thyristor to control the on-off of alternating current, this method does not have electric arc while working, have long performance life, can ignore basically, but there is certain voltage drop when the thyristor switches on, the power consumption is very large when the current flowing through is great, it is serious to heat, the thyristor because the withstand voltage value is not high, easy to take place to break down, the logic control circuit is complicated, the reliability is poor; the third is to use a magnetic latching contactor, which only has the advantage of controlling the power consumption of the coil, but has the disadvantages of short electrical life and complex logic control circuit, and therefore, a new ac contactor or circuit breaker control circuit needs to be developed to solve the existing problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a disconnected circuit breaker of no arc and ac contactor to solve the serious problem of exchange inductive load switch-on, disconnected switching process electric arc.

In order to achieve the above object, the utility model provides a following technical scheme: an arc-free breaking circuit breaker comprising: the power supply comprises a series voltage reduction circuit for reducing the input voltage of a power supply to a set voltage, an MCU power supply circuit connected with the series voltage reduction circuit, an energy storage circuit connected with the MCU power supply circuit and used for providing power, a power signal conversion circuit used for detecting input control voltage, a coil driving circuit connected with the MCU power supply circuit and used for switching on and off of a driving coil, a micro-control chip U2 used for receiving a voltage detection signal of the power signal conversion circuit and sending a zero-crossing pulse signal to the zero-crossing detection conversion circuit, and a zero-crossing detection conversion circuit used for receiving the zero-crossing pulse signal of the micro-control chip U2 and switching the electrode of the input end of the coil.

Preferably, the energy storage circuit comprises a diode D5 with one end connected with the coil driving circuit, an energy storage capacitor C2 connected with the other end of the diode D5, and a resistor R2 connected with the diode D5 in parallel.

Preferably, the circuit breaker further comprises a rectifying and smoothing circuit connected with the power supply and used for converting input alternating current into direct current, wherein the rectifying and smoothing circuit comprises a diode D1 connected with the positive pole of the power supply and a capacitor C3 connected with a diode D1.

Preferably, the series voltage reduction circuit comprises a diode D2, a diode D3 and a diode D4 which are connected in series in sequence, and the diode D2 is connected with the rectifying and filtering circuit.

Preferably, the MCU power supply circuit includes a resistor R1 connected to the series voltage dropping circuit, a zener diode DW1 connected to one end of the resistor R1, and a capacitor C1 connected in parallel to the zener diode DW 1; one end of the capacitor C1 and one end of the voltage stabilizing diode DW1 are connected with a VREF pin of a driving chip U1 in the coil driving circuit; and the other end of the resistor R1 is connected with a VBB pin of a driving chip U1 in the coil driving circuit.

Preferably, the coil driving circuit comprises a driving chip U1, a resistor R7 having one end connected to the LSS pin of the driving chip U1, a diode D7 and a diode D11 connected to the other end of the resistor R7, a diode D6 connected to the diode D7, and a diode D8 connected to the diode D11, wherein the OUT1 pin and the OUT2 pin of the driving chip U1 are connected to the coil.

Preferably, the power supply signal conversion circuit comprises a resistor R4 with one end connected with the series step-down circuit, a resistor R3 connected with the other end of the resistor R4, a resistor R10 connected with the resistor R3, a capacitor C4 connected in parallel with two ends of the resistor R10, and a voltage stabilizing diode DW 2.

Preferably, the node of the resistor R10, the capacitor C4 and the zener diode DW2 is connected to the negative electrode of the power supply, and the zener diode DW2 is further connected to AN10 pin of the micro-control chip U2.

Preferably, the zero-crossing detection conversion circuit comprises a photoelectric coupler U3 connected with a micro-control chip U2, a triode V1 and a capacitor C5 connected with U3, a resistor R11 connected with the triode V1, a D14 with one end connected with a node of the resistor R11 and the capacitor C5, a zener diode DW3 connected with the other end of the D14, a resistor R5 connected with the zener diode DW3 in parallel, a diode D9 connected with the resistor R5, a diode D13 connected with the diode D9 in parallel, a resistor R8 with one end connected with the diode D9, a resistor R9 with one end connected with the diode D13, a diode D10 with one end connected with a node of the diode D9 and the resistor R8, and a diode D12 connected with a node of the diode D13 and the resistor R9 in series connected with the diode D10.

Preferably, the IN1 pin and the IN2 pin of the driving chip U1 are connected to the P3.4 pin and the P3.5 pin of the micro control chip U2, respectively.

The utility model provides a disconnected ac contactor of no arc section in addition, include: the device comprises a series voltage reduction circuit for reducing the input voltage of a power supply to a set voltage, an MCU power supply circuit connected with the series voltage reduction circuit, an energy storage circuit connected with the MCU power supply circuit and used for providing power, a power signal conversion circuit used for detecting input control voltage, a coil driving circuit connected with the MCU power supply circuit and used for switching on and off a driving coil, a micro-control chip U2 used for receiving a voltage detection signal of the power signal conversion circuit and sending a zero-crossing pulse signal to the zero-crossing detection conversion circuit, and the zero-crossing detection conversion circuit used for receiving the zero-crossing pulse signal of the micro-control chip U2 and switching the electrode of the input end of the coil. The energy storage circuit comprises a diode D5 with one end connected with the coil driving circuit, an energy storage capacitor C2 connected with the other end of the diode D5, and a resistor R2 connected with the diode D5 in parallel. The alternating current contactor also comprises a rectifying and filtering circuit which is connected with a power supply and is used for converting input alternating current into direct current, wherein the rectifying and filtering circuit comprises a diode D1 connected with the positive pole of the power supply and a capacitor C3 connected with a diode D1. The series voltage reduction circuit comprises a diode D2, a diode D3 and a diode D4 which are connected in series in sequence, and the diode D2 is connected with the rectifying and filtering circuit. Preferably, the MCU power supply circuit includes a resistor R1 connected to the series voltage dropping circuit, a zener diode DW1 connected to one end of the resistor R1, and a capacitor C1 connected in parallel to the zener diode DW 1; one end of the capacitor C1 and one end of the voltage stabilizing diode DW1 are connected with a VREF pin of a driving chip U1 in the coil driving circuit; and the other end of the resistor R1 is connected with a VBB pin of a driving chip U1 in the coil driving circuit. Preferably, the coil driving circuit comprises a driving chip U1, a resistor R7 having one end connected to the LSS pin of the driving chip U1, a diode D7 and a diode D11 connected to the other end of the resistor R7, a diode D6 connected to the diode D7, and a diode D8 connected to the diode D11, wherein the OUT1 pin and the OUT2 pin of the driving chip U1 are connected to the coil. Preferably, the power supply signal conversion circuit comprises a resistor R4 with one end connected with the series step-down circuit, a resistor R3 connected with the other end of the resistor R4, a resistor R10 connected with the resistor R3, a capacitor C4 connected in parallel with two ends of the resistor R10, and a voltage stabilizing diode DW 2. Preferably, the node of the resistor R10, the capacitor C4 and the zener diode DW2 is connected to the negative electrode of the power supply, and the zener diode DW2 is further connected to AN10 pin of the micro-control chip U2. Preferably, the zero-crossing detection conversion circuit comprises a photoelectric coupler U3 connected with a micro-control chip U2, a triode V1 and a capacitor C5 connected with U3, a resistor R11 connected with the triode V1, a D14 with one end connected with a node of the resistor R11 and the capacitor C5, a zener diode DW3 connected with the other end of the D14, a resistor R5 connected with the zener diode DW3 in parallel, a diode D9 connected with the resistor R5, a diode D13 connected with the diode D9 in parallel, a resistor R8 with one end connected with the diode D9, a resistor R9 with one end connected with the diode D13, a diode D10 with one end connected with a node of the diode D9 and the resistor R8, and a diode D12 connected with a node of the diode D13 and the resistor R9 in series connected with the diode D10. The IN1 and IN2 pins of the driver chip U1 are connected to the P3.4 pin and P3.5 pin of the micro control chip U2, respectively.

The utility model discloses a technological effect and advantage: the arc-free breaking circuit breaker is convenient to use, solves the problem of electric arc generated in the process of switching on and off of an alternating current load, is efficient and energy-saving, controls the time of closing and breaking a circuit of an electromagnetic actuating mechanism in a delayed mode, controls the contact to be switched on and off in a delayed mode in a time-sharing mode so as to find the real current zero crossing point, and effectively solves the problem of electric corrosion of the contact during load switching.

Drawings

Fig. 1 is a circuit diagram of the present invention;

fig. 2 is a working principle diagram of the electromagnetic actuator of the present invention.

In the figure: 1. a series voltage reduction circuit; 2. an MCU power supply circuit; 3. a tank circuit; 4. a power supply signal conversion circuit; 5. a coil drive circuit; 6. a zero-crossing detection conversion circuit; 7. a rectification filter circuit; 8. a first permanent magnet; 9. a second permanent magnet; 10. a movable iron core; 11. a coil; 12. a magnetizer; 13. a control circuit board; 14. controlling a power supply; 15. a main loop static contact; 16. a main loop moving contact; 17. a linkage assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a disconnected circuit breaker of no arc as shown in fig. 1, include: a series step-down circuit 1 for reducing the power supply input control voltage to a set voltage,

The series voltage reduction circuit 1 comprises a diode D2, a diode D3 and a diode D4 which are sequentially connected in series, and the diode D2 is connected with the rectifying and filtering circuit 7.

The MCU power supply circuit 2 is connected with the series voltage reduction circuit 1, and the MCU power supply circuit 2 comprises a resistor R1 connected with the series voltage reduction circuit 1, a voltage stabilizing diode DW1 connected at one end of the resistor R1, and a capacitor C1 connected with the voltage stabilizing diode DW1 in parallel;

one end of the capacitor C1 and one end of the voltage stabilizing diode DW1 are connected with a VREF pin of a driving chip U1 in the coil driving circuit 5; the other end of the resistor R1 is connected with the VBB pin of the driving chip U1 in the coil driving circuit 5.

The coil driving circuit 5 is connected with the MCU power supply circuit 2 and used for driving the coil to be switched on and off, and the coil driving circuit 5 comprises a driving chip U1, a resistor R7 with one end connected with an LSS pin of the driving chip U1, a diode D7 and a diode D11 which are connected with the other end of the resistor R7, a diode D6 connected with a diode D7, and a diode D8 connected with a diode D11; the resistor R7 is connected with the LSS pin of the driving chip U1, and the OUT1 pin and the OUT2 pin of the driving chip U1 are connected with the coil.

The power supply signal conversion circuit 4 is connected with the coil driving circuit 5 and used for detecting input control voltage, and the power supply signal conversion circuit 4 comprises a resistor R4, a resistor R3, a resistor R10, a capacitor C4 and a voltage stabilizing diode DW2, wherein one end of the resistor R4 is connected with the series voltage reduction circuit 1, the resistor R3 is connected with the other end of the resistor R4, the resistor R10 is connected with the resistor R3, and the capacitor C4 and the voltage stabilizing diode DW2 are connected with two ends of the resistor R10 in parallel;

the node of the resistor R10, the capacitor C4 and the voltage stabilizing diode DW2 is connected with the cathode of the power supply, and the voltage stabilizing diode DW2 is also connected with AN AN10 pin of the micro-control chip U2.

The energy storage circuit 3 receives the voltage detection signal of the power supply signal conversion circuit 4 and provides electric energy for the coil driving circuit 5, and the energy storage circuit 3 comprises a diode D5 with one end connected with the coil driving circuit 5, an energy storage capacitor C2 connected with the other end of the diode D5 and a resistor R2 connected with the diode D5 in parallel;

the rectifying and filtering circuit 7 comprises a diode D1 connected with the anode of the power supply and a capacitor C3 connected with a diode D1.

A micro control chip U2 for receiving the voltage detection signal of the power supply signal conversion circuit 4 and sending the zero-crossing pulse signal to the zero-crossing detection conversion circuit 6,

The zero-crossing detection conversion circuit 6 is used for receiving a zero-crossing pulse signal of the micro-control chip U2 and switching the electrode of the input end of the coil, and the zero-crossing detection conversion circuit 6 comprises a photoelectric coupler U3 connected with a micro-control chip U2, a triode V1 and a capacitor C5 connected with a U3, a resistor R11 connected with the triode V1, a D5 with one end connected with the node between the resistor R11 and the capacitor C5, a zener diode DW 5 connected with the other end of the D5, a resistor R5 connected with the zener diode DW 5 in parallel, a diode D5 connected with the resistor R5 in parallel, a diode D5 connected with the diode D5 in parallel, a resistor R5 with one end connected with the diode D5 and the node between the resistor R5, and a diode D5 connected with one end connected with the diode D5 and the node between the diode D5 in series, and the diode D5.

A rectifying and filtering circuit 7 connected to a power supply for converting an input ac power into a dc power;

the IN1 pin and the IN2 pin of the driving chip U1 are respectively connected with the P3.4 pin and the P3.5 pin of the micro control chip U2;

the arc-free breaking circuit breaker is powered on, the anode of the arc-free breaking circuit breaker is rectified and filtered through a diode D1 and a capacitor C3, and then is subjected to series connection and voltage reduction through a diode D2, a diode D3 and a diode D4 multi-diode array, and power supply voltage is provided for a VBB pin of a driving chip U1 according to the series connection quantity of diodes configured according to the height of input voltage; the present embodiment takes the electromagnetic actuator as an example,

the electromagnetic actuator operates as shown in FIG. 2; the first permanent magnet 8 is switched off; closing the second permanent magnet 9; a movable iron core 10; a coil 11; a magnetizer 12; a control circuit board 13; a control power supply 14; a main loop static contact 15; a main loop movable contact 16; a linkage assembly 17;

when the control power supply 14 is switched on, the control circuit board 13 outputs a positive voltage pulse to the coil 11, the main loop moving contact 16 moves downwards along with the linkage component 17 and the moving iron core 10, and the main loop static contact 15 and the main loop moving contact 16 keep a closed state under the action of the closed permanent magnet 9; when the control power supply 14 is disconnected, the control circuit board 13 outputs a reverse pulse voltage to the coil 11, the main loop moving contact 16 moves upwards along with the linkage component 17 and the moving iron core 10, and the main loop static contact 15 and the main loop moving contact 16 are kept disconnected under the action of the disconnected permanent magnet 8;

the coil working voltage of the electromagnetic actuator of the embodiment is simultaneously charged to the capacitor C2 energy storage capacitor through the resistor R2, and the voltage with the voltage stabilizing value of 5V is connected in series with the voltage stabilizing diode DW1 through the resistor R1 and is connected to the analog voltage input Vref pin of the driving chip U1; the anode of the power supply is connected to the AD signal input end of AN AN10 pin of the micro-control chip U2 after voltage division through a resistor R4, a resistor R3 and a resistor R10; the output I/O ports P3.4 and P3.5 of the micro control chip U2 are respectively connected with an IN1 pin and an IN2 pin of a drive chip U1; when the AD input end AN10 of the micro-control chip U2 detects that the control power supply voltage is higher than the voltage set value of the electromagnetic actuator coil, and the P1.7 of the micro-control chip U2 detects the zero crossing point falling edge of the alternating current signal, after the time delay is controlled by the program of the micro-control chip U2, the IN2 is set to be at a high level, and the IN1 is set to be at a low level; according to the truth table of U1, see table 1,

Figure 602368DEST_PATH_DEST_PATH_IMAGE001

TABLE 1

The OUT2 pin of the drive chip U1 outputs a positive pole, the OUT1 pin outputs a negative power supply voltage, the coil of the electromagnetic actuating mechanism is electrified, the magnetic direction state of the electromagnet is overturned, the electromagnetic actuating mechanism is kept closed under the action of the permanent magnet, the IN2 low level is controlled by the program of the micro control chip U2, the IN2 pin level of the drive chip U1 is pulled low, the OUT1 pin and the OUT2 pin of the drive chip U1 output high resistance according to the truth table of the drive chip U1, the coil of the electromagnetic actuating mechanism is deenergized, and the coil current is zero; when the power supply is cut off, or the AD of the micro-control chip U2 detects that the voltage at the input end is lower than the voltage cut-off set value of the coil of the electromagnetic actuator, the energy storage capacitor C2 discharges and continues to provide power for the chip through the diode D5, the diode D4 is cut off IN the reverse direction to prohibit power supply to the power signal conversion circuit 4, the P1.7 pin of the micro-control chip U2 detects the falling edge of the zero crossing point of the alternating current signal, namely the alternating current synchronous zero crossing signal, the program control IN1 is set to be at high level, the output of the OUT1 pin and the OUT2 pin of the driving chip U1 are turned over instantly according to the truth table, the OUT2 pin outputs the negative pole, the OUT1 pin outputs the positive pole, the coil of the electromagnetic actuator is electrified under the action of the energy storage capacitor C2, the magnetic direction state of the electromagnet is turned over, the electromagnetic actuator keeps the cut-off state under the action of the permanent magnet, and the program control IN1 is controlled to be at low level by the program control IN2 of the micro-control chip U2, the level of an IN1 pin of a driving chip U1 is pulled low, according to a truth table of the driving chip U1, OUT1 pins and OUT2 pins of the driving chip U1 output high resistance, a coil of an electromagnetic execution mechanism is de-energized, the current of the coil is zero, and the coil is prevented from being energized all the time under low voltage; AN0-AN5 of the micro-control chip U2 are AD input channels for expanding other detection and protection functions, RXD and TXD of the micro-control chip U2 are asynchronous communication interfaces, and can expand communication with AN upper computer communication function and human-computer interface debugging software and verify parameter configuration;

the utility model provides a disconnected ac contactor of no arc section in addition, include: the power supply comprises a series voltage reduction circuit for reducing the input voltage of a power supply to a set voltage, an MCU power supply circuit connected with the series voltage reduction circuit, an energy storage circuit connected with the MCU power supply circuit and used for providing power, a power signal conversion circuit used for detecting input control voltage, a coil driving circuit connected with the MCU power supply circuit and used for switching on and off of a driving coil, a micro-control chip U2 used for receiving a voltage detection signal of the power signal conversion circuit and sending a zero-crossing pulse signal to the zero-crossing detection conversion circuit, and a zero-crossing detection conversion circuit used for receiving the zero-crossing pulse signal of the micro-control chip U2 and switching the electrode of the input end of the coil. The energy storage circuit comprises a diode D5 with one end connected with the coil driving circuit, an energy storage capacitor C2 connected with the other end of the diode D5, and a resistor R2 connected with the diode D5 in parallel. The alternating current contactor also comprises a rectifying and filtering circuit which is connected with a power supply and is used for converting input alternating current into direct current, wherein the rectifying and filtering circuit comprises a diode D1 connected with the positive pole of the power supply and a capacitor C3 connected with a diode D1. The series voltage reduction circuit comprises a diode D2, a diode D3 and a diode D4 which are connected in series in sequence, and the diode D2 is connected with the rectifying and filtering circuit. Preferably, the MCU power supply circuit includes a resistor R1 connected to the series voltage dropping circuit, a zener diode DW1 connected to one end of the resistor R1, and a capacitor C1 connected in parallel to the zener diode DW 1; one end of the capacitor C1 and one end of the voltage stabilizing diode DW1 are connected with a VREF pin of a driving chip U1 in the coil driving circuit; and the other end of the resistor R1 is connected with a VBB pin of a driving chip U1 in the coil driving circuit. Preferably, the coil driving circuit comprises a driving chip U1, a resistor R7 having one end connected to the LSS pin of the driving chip U1, a diode D7 and a diode D11 connected to the other end of the resistor R7, a diode D6 connected to the diode D7, and a diode D8 connected to the diode D11, wherein the OUT1 pin and the OUT2 pin of the driving chip U1 are connected to the coil. Preferably, the power supply signal conversion circuit comprises a resistor R4 with one end connected with the series step-down circuit, a resistor R3 connected with the other end of the resistor R4, a resistor R10 connected with the resistor R3, a capacitor C4 connected in parallel with two ends of the resistor R10, and a voltage stabilizing diode DW 2. Preferably, the node of the resistor R10, the capacitor C4 and the zener diode DW2 is connected to the negative electrode of the power supply, and the zener diode DW2 is further connected to AN10 pin of the micro-control chip U2. Preferably, the zero-crossing detection conversion circuit comprises a photoelectric coupler U3 connected with a micro-control chip U2, a triode V1 and a capacitor C5 connected with U3, a resistor R11 connected with the triode V1, a D14 with one end connected with a node of the resistor R11 and the capacitor C5, a zener diode DW3 connected with the other end of the D14, a resistor R5 connected with the zener diode DW3 in parallel, a diode D9 connected with the resistor R5, a diode D13 connected with the diode D9 in parallel, a resistor R8 with one end connected with the diode D9, a resistor R9 with one end connected with the diode D13, a diode D10 with one end connected with a node of the diode D9 and the resistor R8, and a diode D12 connected with a node of the diode D13 and the resistor R9 in series connected with the diode D10. The IN1 and IN2 pins of the driver chip U1 are connected to the P3.4 pin and P3.5 pin of the micro control chip U2, respectively.

The arc-free breaking circuit breaker is convenient to use, solves the problem of electric arc generated in the process of switching on and off of an alternating current inductive load, is efficient and energy-saving, controls the time of a contactor for adsorbing and switching off a circuit in a delayed mode, controls the contact to be switched on and off in a delayed mode in a time-sharing mode so as to find the real current zero crossing point, and effectively solves the problem of electric corrosion of the contact during load switching.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. A circuit breaker for non-arc breaking is characterized in that: the method comprises the following steps: the power supply voltage detection circuit comprises a series voltage reduction circuit (1) for reducing power supply input voltage to set voltage, an MCU power supply circuit (2) connected with the series voltage reduction circuit (1), an energy storage circuit (3) connected with the MCU power supply circuit (2) and used for providing power, a power signal conversion circuit (4) used for detecting input control voltage, a coil driving circuit (5) connected with the MCU power supply circuit (2) and used for driving coils to be switched on and off, a micro-control chip U2 used for receiving voltage detection signals of the power signal conversion circuit (4) and sending zero-crossing pulse signals to a zero-crossing detection conversion circuit (6), and a zero-crossing detection conversion circuit (6) used for receiving the zero-crossing pulse signals of the micro-control chip U2 and switching the electrodes of coil input ends.

2. An arc-free breaking circuit breaker according to claim 1, wherein: the energy storage circuit (3) comprises a diode D5 with one end connected with the coil driving circuit (5), an energy storage capacitor C2 connected with the other end of the diode D5, and a resistor R2 connected with the diode D5 in parallel.

3. An arc-free breaking circuit breaker according to claim 1, wherein: the circuit breaker further comprises a rectifying and smoothing circuit (7) connected with a power supply and used for converting input alternating current into direct current, wherein the rectifying and smoothing circuit (7) comprises a diode D1 connected with the positive pole of the power supply and a capacitor C3 connected with a diode D1.

4. An arc-free breaking circuit breaker according to claim 1, wherein: the series voltage reduction circuit (1) comprises a diode D2, a diode D3 and a diode D4 which are sequentially connected in series, and the diode D2 is connected with the rectifying and filtering circuit (7).

5. An arc-free breaking circuit breaker according to claim 1, wherein:

the MCU power supply circuit (2) comprises a resistor R1 connected with the series voltage reduction circuit (1), a voltage stabilizing diode DW1 connected at one end of the resistor R1, and a capacitor C1 connected with the voltage stabilizing diode DW1 in parallel; one end of the capacitor C1 and one end of the voltage stabilizing diode DW1 are connected with a VREF pin of a driving chip U1 in the coil driving circuit (5); and the other end of the resistor R1 is connected with a VBB pin of a driving chip U1 in the coil driving circuit (5).

6. An arc-free breaking circuit breaker according to claim 1, wherein: the coil driving circuit (5) comprises a driving chip U1, a resistor R7 with one end connected to the LSS pin of the driving chip U1, a diode D7 and a diode D11 connected to the other end of the resistor R7, a diode D6 connected with a diode D7, and a diode D8 connected with a diode D11, wherein the OUT1 pin and the OUT2 pin of the driving chip U1 are connected with a coil; the IN1 and IN2 pins of the driver chip U1 are connected to the P3.4 pin and P3.5 pin of the micro control chip U2, respectively.

7. An arc-free breaking circuit breaker according to claim 1, wherein: the power supply signal conversion circuit (4) comprises a resistor R4, a resistor R3, a resistor R10, a capacitor C4 and a voltage stabilizing diode DW2, wherein one end of the resistor R4 is connected with the series voltage reduction circuit (1), the resistor R3 is connected to the other end of the resistor R4, the resistor R10 is connected with the resistor R3, and the capacitor C4 and the voltage stabilizing diode DW2 are connected to two ends of the resistor R10 in parallel.

8. An arc-free breaking circuit breaker according to claim 7, wherein: the nodes of the resistor R10, the capacitor C4 and the voltage stabilizing diode DW2 are connected with the cathode of a power supply, and the voltage stabilizing diode DW2 is also connected with AN AN10 pin of the micro-control chip U2.

9. An arcless breaking circuit breaker according to claim 1, wherein: the zero-crossing detection conversion circuit (6) comprises a photoelectric coupler U3 connected with a micro-control chip U2, a triode V1 and a capacitor C5 connected with U3, a resistor R11 connected with the triode V1, a D14 with one end connected with the node of the resistor R11 and the capacitor C5, a zener diode DW3 connected with the other end of the D14, a resistor R5 connected with the zener diode DW3 in parallel, a diode D9 connected with the resistor R5, a diode D13 connected with the diode D9 in parallel, a resistor R8 with one end connected with the diode D9, a resistor R9 with one end connected with the diode D13, a diode D10 with one end connected with the node of the diode D9 and the resistor R8, and a diode D12 connected with the node of the diode D13 and the resistor R9 in series, wherein the diode D10 is connected with the node of the diode D13 and the resistor R9.

10. An arc-free disjunction alternating current contactor is characterized in that: the method comprises the following steps: the power supply voltage detection circuit comprises a series voltage reduction circuit (1) for reducing power supply input voltage to set voltage, an MCU power supply circuit (2) connected with the series voltage reduction circuit (1), an energy storage circuit (3) connected with the MCU power supply circuit (2) and used for providing power, a power signal conversion circuit (4) used for detecting input control voltage, a coil driving circuit (5) connected with the MCU power supply circuit (2) and used for driving coils to be switched on and off, a micro-control chip U2 used for receiving voltage detection signals of the power signal conversion circuit (4) and sending zero-crossing pulse signals to a zero-crossing detection conversion circuit (6), and a zero-crossing detection conversion circuit (6) used for receiving the zero-crossing pulse signals of the micro-control chip U2 and switching the electrodes of coil input ends.

11. An arcless disconnected ac contactor according to claim 10, wherein: the energy storage circuit (3) comprises a diode D5 with one end connected with the coil driving circuit (5), an energy storage capacitor C2 connected with the other end of the diode D5, and a resistor R2 connected with the diode D5 in parallel.

12. An arcless disconnected ac contactor according to claim 10, wherein: the alternating current contactor also comprises a rectifying and filtering circuit (7) which is connected with a power supply and is used for converting input alternating current into direct current, wherein the rectifying and filtering circuit (7) comprises a diode D1 connected with the positive pole of the power supply and a capacitor C3 connected with a diode D1.

13. An arcless disconnected ac contactor according to claim 10, wherein: the series voltage reduction circuit (1) comprises a diode D2, a diode D3 and a diode D4 which are sequentially connected in series, and the diode D2 is connected with the rectifying and filtering circuit (7).

14. An arcless disconnected ac contactor according to claim 10, wherein:

15. An arcless disconnected ac contactor according to claim 10, wherein: the coil driving circuit (5) comprises a driving chip U1, a resistor R7 with one end connected to the LSS pin of the driving chip U1, a diode D7 and a diode D11 connected to the other end of the resistor R7, a diode D6 connected with a diode D7, and a diode D8 connected with a diode D11, wherein the OUT1 pin and the OUT2 pin of the driving chip U1 are connected with a coil; the IN1 and IN2 pins of the driver chip U1 are connected to the P3.4 pin and P3.5 pin of the micro control chip U2, respectively.

16. An arcless disconnected ac contactor according to claim 10, wherein: the power supply signal conversion circuit (4) comprises a resistor R4, a resistor R3, a resistor R10, a capacitor C4 and a voltage stabilizing diode DW2, wherein one end of the resistor R4 is connected with the series voltage reduction circuit (1), the resistor R3 is connected to the other end of the resistor R4, the resistor R10 is connected with the resistor R3, and the capacitor C4 and the voltage stabilizing diode DW2 are connected to two ends of the resistor R10 in parallel.

17. An arcless disconnected ac contactor according to claim 16, wherein: the nodes of the resistor R10, the capacitor C4 and the voltage stabilizing diode DW2 are connected with the cathode of a power supply, and the voltage stabilizing diode DW2 is also connected with AN AN10 pin of the micro-control chip U2.

18. An arcless disconnected ac contactor according to claim 10, wherein: the zero-crossing detection conversion circuit (6) comprises a photoelectric coupler U3 connected with a micro-control chip U2, a triode V1 and a capacitor C5 connected with the U3, a resistor R11 connected with the triode V1, a D14 with one end connected with the node of the resistor R11 and the capacitor C5, a zener diode DW3 connected with the other end of the D14, a resistor R5 connected with the zener diode DW3 in parallel, a diode D9 connected with the resistor R5, a diode D13 connected with the diode D9 in parallel, a resistor R8 with one end connected with the diode D9, a resistor R9 with one end connected with the diode D13, a diode D10 with one end connected with the node of the diode D9 and the resistor R8, and a diode D12 connected with the node of the diode D13 and the resistor R9 in series on the diode D10.