CN114415580A - Control method of arc-free disjunction alternating current circuit - Google Patents
Control method of arc-free disjunction alternating current circuit Download PDFInfo
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- CN114415580A CN114415580A CN202210329046.2A CN202210329046A CN114415580A CN 114415580 A CN114415580 A CN 114415580A CN 202210329046 A CN202210329046 A CN 202210329046A CN 114415580 A CN114415580 A CN 114415580A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
The invention discloses a control method of an arc-free disjunction alternating current circuit, belonging to the technical field of power control and comprising the following steps: a power supply step: converting the input control voltage into a coil working voltage of an electromagnetic actuating mechanism, and supplying power to an energy storage circuit; an input voltage detection step: detecting an input voltage value in the power supply step, and comparing the input control voltage value with a set value; a closing step: the control circuit outputs forward pulse to the coil in a delayed mode, and the electromagnetic actuating mechanism is connected with the main loop when the electromagnetic actuating mechanism is at the next zero crossing point; a disconnection step, namely disconnecting the main loop when the electromagnetic actuating mechanism is at the next zero crossing point; the invention solves the problem of electric arc generated in the process of switching on and off of the alternating current load, has high efficiency and energy conservation, controls the time of closing and opening a circuit of the electromagnetic actuating mechanism by software time delay, and controls the time-delayed on and off of the contact in a time-sharing manner so as to find the real current zero crossing point and effectively solve the problem of electric corrosion of the contact when the load is switched.
Description
Technical Field
The invention belongs to the technical field of power control, and particularly relates to a control method of an arc-free disjunction alternating current circuit.
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 control method needs to be developed to solve the existing problems.
Disclosure of Invention
The invention aims to provide a control method of an arc-free disjunction alternating current circuit, which aims to solve the problem of serious arc in the process of switching on and off an alternating current inductive load.
In order to achieve the purpose, the invention provides the following technical scheme: a control method of an arc-free disjunction alternating current circuit comprises the following steps:
a power supply step:
converting the input control voltage into a coil working voltage of an electromagnetic actuating mechanism, and supplying power to an energy storage circuit;
an input voltage detection step:
detecting an input voltage value in the power supply step, and comparing the input voltage value with a set value;
a closing step:
when a control power supply is switched on or the input voltage is detected to be higher than a coil voltage closing set value of the electromagnetic actuating mechanism and a zero-crossing signal of a main loop is detected, the control circuit delays to output a forward pulse to a coil, and the electromagnetic actuating mechanism is switched on the main loop at the next zero-crossing point;
a disconnection step:
when the control power supply is disconnected or the input voltage is detected to be lower than the coil voltage closing set value of the electromagnetic actuating mechanism and the zero-crossing signal of the main loop is detected, the control circuit delays to output reverse pulse to the coil, and the electromagnetic actuating mechanism disconnects the main loop at the next zero-crossing point.
Preferably, the control circuit comprises a series voltage reduction circuit for reducing the input voltage of the power supply to a set voltage, an MCU power supply circuit connected with the series voltage reduction circuit, a rectifying and filtering circuit connected with the power supply for converting the input alternating current into direct current, an energy storage circuit connected with the MCU power supply circuit for providing power, a power signal conversion circuit for detecting the input control voltage, a coil driving circuit connected with the MCU power supply circuit for driving the coil to be turned on and off, a micro control chip U2 for receiving the 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 for receiving the zero-crossing pulse signal of the micro control chip U2 and switching the input electrode 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;
the rectification filter 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 sequentially connected in series, and the diode D2 is connected with the rectifying and filtering circuit;
the MCU power supply circuit comprises a resistor R1 connected with the series voltage reduction circuit, a voltage stabilizing diode DW1 connected to one end of the resistor R1, and a capacitor C1 connected in parallel with the voltage stabilizing 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; the other end of the resistor R1 is connected with a VBB pin of a driving chip U1 in the coil driving circuit;
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.
Preferably, in the power supplying step: the power supply is powered on, the anode of the power supply is rectified and filtered through a diode D1 and a capacitor C3, the power supply is serially connected with a diode D2, a diode D3 and a diode D4 multi-diode array for voltage reduction, the power supply voltage is provided for a VBB pin of a driving chip U1 according to the serial quantity of diodes configured according to the height of input voltage, the capacitor C2 energy storage capacitor is charged through a resistor R2, and voltage with the voltage stabilizing value of 5V is connected in series with a voltage stabilizing diode DW1 through the resistor R1 and is connected to an 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 MCU U2 are connected to the IN1 and IN2 pins of the driver U1, respectively.
Preferably, the coil driving circuit includes 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.
Preferably, the power supply signal conversion circuit comprises a resistor R4 with one end connected with the series voltage reduction 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;
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.
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 the diode D10 in series and connected with a node of the diode D13 and the resistor R9.
Preferably, IN the closing step, when the control power supply is turned on or the AD input terminal AN10 of the micro-control chip U2 detects that the input control voltage is greater than the set value of the coil voltage of the electromagnetic actuator, and the P1.7 of the micro-control chip U2 detects the falling edge of the zero-crossing point of the alternating current signal, the IN2 is set to high level and the IN1 is set to low level after the program control delay of the micro-control chip U2; 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.
Preferably, in the step of disconnecting: when the power supply is controlled to be powered off, or the AD AN10 of the micro-control chip U2 detects that the input control voltage is lower than the voltage set value of the coil of the electromagnetic actuator, the energy storage capacitor C2 discharges to continuously 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 supply signal conversion circuit, the P1.7 pin of the micro-control chip U2 detects the falling edge of the zero crossing point of the alternating current signal, the IN1 is controlled to be set at a high level, the output of the OUT1 pin and the OUT2 pin of the driving chip U1 are instantaneously inverted, the OUT2 pin outputs a negative pole, the OUT1 pin outputs a 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 inverted, the electromagnetic actuator keeps AN off state under the action of the permanent magnet, the program of the micro-control chip U2 controls the IN1 to be at a low level, the IN1 pin of the driving chip U1 is pulled down, the OUT1 of the driving chip U1, The OUT2 pin outputs high resistance, the electromagnetic actuator coil loses power, and the coil current is zero.
Preferably, the pins IN1 and IN2 of the driver chip U1 are respectively connected with the pins P3.4 and P3.5 of the micro control chip U2; the micro-control chip U2 further comprises an RXD pin for communication, a TXD pin, an INT1 pin for a programming interface, an INT1 pin, a TDI pin and a TCK pin.
The invention has the technical effects and advantages that: the control method for the arc-free breaking alternating current circuit 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 opening the circuit of the 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 a real current zero crossing point, and effectively solves the problem of electric corrosion of the contact during load switching.
Drawings
FIG. 1 is a schematic flow chart of the present invention
FIG. 2 is a schematic diagram of the operation of the electromagnetic actuator of the present invention;
FIG. 3 is a control circuit diagram 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 clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a control method of an arc-free disjunction alternating current circuit as shown in figure 1, which comprises the following steps:
a power supply step:
converting the input control voltage into a coil working voltage of an electromagnetic actuating mechanism, and supplying power to the energy storage circuit 3;
an input voltage detection step:
detecting an input voltage value in the power supply step, and comparing the input voltage value with a set value;
a closing step:
when a control power supply is switched on or the input control voltage is detected to be higher than a coil voltage closing set value of the electromagnetic actuating mechanism and a zero-crossing signal of a main loop is detected, the control circuit delays to output a forward pulse to the coil, the electromagnetic actuating mechanism is switched on at the next zero-crossing point, if the input control voltage is detected to be higher than the set value, the micro control chip U2 detects a falling edge, the coil of the electromagnetic actuating mechanism is electrified, and the electromagnetic actuating mechanism keeps a closing state under the action of a permanent magnet; in this embodiment, when the microprocessor chip U2 detects a zero crossing point on the ac signal side, the time delay program of the microprocessor chip U2 outputs a close signal to the full bridge control chip U1, and the electromagnetic actuator precisely switches on the main circuit at the next zero crossing point, so that the main circuit is not arc-closed; the coil of the electromagnetic actuating mechanism is electrified, and the electromagnetic actuating mechanism keeps a closed state under the action of the permanent magnet;
a disconnection step:
when a control power supply is disconnected or the input control voltage is detected to be lower than a coil voltage closing set value of the electromagnetic actuating mechanism and a zero-crossing signal of a main loop is detected, the control circuit delays to output a reverse pulse to the coil, the electromagnetic actuating mechanism disconnects the main loop at the next zero-crossing point, if the input control voltage is detected to be lower than the set value, the micro-control chip U2 detects a falling edge, the energy storage circuit 3 supplies power to the coil of the electromagnetic actuating mechanism, the positive polarity and the negative polarity of the coil closing step of the electromagnetic actuating mechanism are converted, the magnetic force direction state of the electromagnet is reversed, the electromagnetic actuating mechanism is kept in an open state under the action of a permanent magnet, the coil of the electromagnetic actuating mechanism is de-energized, and the coil current is zero; in this embodiment, when the microprocessor chip U2 detects a zero crossing point of the ac main circuit, the time-delay program of the microprocessor chip U2 outputs a turn-off signal to the full-bridge control chip U1, the electromagnetic actuator precisely breaks the main circuit at the next zero crossing point, at this time, the energy storage capacitor continues to supply power to the electric control circuit, the full-bridge control chip U1 outputs a reverse voltage, the magnetic direction of the coil electromagnet is reversed, so that the main circuit is not arc-disconnected at the zero crossing point, the program controls the output voltage of the full-bridge control chip U1 to be zero, the coil of the electromagnetic actuator is de-energized, and the electromagnetic actuator keeps a disconnected state under the action of the permanent magnet;
as shown in fig. 3, the control circuit includes: 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 comprises a photoelectric coupler U3 connected with a micro-control chip U2, a triode V1 and a capacitor C5 which are connected with the U3, a resistor R11 connected with a triode V1, a D14 connected with the node of the resistor R11 and the capacitor C5 at one end, 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 connected with the diode D9 at one end, a resistor R9 connected with the diode D13 at one end, a diode D10 connected with the node of the diode D9 and the resistor R8 at one end, and a diode D12 connected with the node of the diode D13 and the resistor R9 in series on the diode D10.
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 micro-control chip U2 further comprises an RXD pin, a TXD pin, an INT1 pin, an INT1 pin, a TDI pin and a TCK pin, wherein the RXD pin and the TXD pin are used for communication, and the INT1 pin, the INT1 pin, the TDI pin and the TCK pin are used for programming interfaces;
the control method of the arc-free breaking alternating current circuit comprises the steps that a power supply is electrified, the anode of the power supply is rectified and filtered through a diode D1 and a capacitor C3, and then is serially connected through a diode D2, a diode D3 and a diode D4 multi-diode array for voltage reduction, and power supply voltage is provided for a VBB pin of a driving chip U1 according to the serial number 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 and the second permanent magnet 9 is switched on;
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,
TABLE 1 truth table
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 control method of the arc-free breaking alternating current circuit is convenient to use, solves the problem of electric arc generated in the switching process of the on-off of the alternating current inductive load, is efficient and energy-saving, controls the time of the contactor for adsorbing and switching off the circuit in a delayed mode, controls the contact to be 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 in the load switching process.
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 may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A control method of an arc-free disjunction alternating current circuit is characterized in that: the method comprises the following steps:
a power supply step:
converting the input control voltage into a coil working voltage of an electromagnetic actuating mechanism, and supplying power to an energy storage circuit (3);
an input voltage detection step:
detecting an input voltage value in the power supply step, and comparing the input control voltage value with a set value;
a closing step:
when a control power supply is switched on or the input control voltage is detected to be higher than a coil voltage closing set value of the electromagnetic actuating mechanism and a main loop zero-crossing signal is detected, the control circuit delays to output a forward pulse to the coil, and the electromagnetic actuating mechanism is switched on the main loop at the next zero-crossing point;
a disconnection step:
when the control power supply is disconnected or the input control voltage is detected to be lower than the coil voltage closing set value of the electromagnetic actuating mechanism and the zero-crossing signal of the main loop is detected, the control circuit delays to output reverse pulse to the coil, and the electromagnetic actuating mechanism disconnects the main loop at the next zero-crossing point.
2. A method of controlling an arc-free ac circuit for breaking, according to claim 1, wherein: the control circuit comprises a series voltage reduction circuit (1) for reducing the input voltage of the power supply to a set voltage, an MCU power supply circuit (2) connected with the series voltage reduction circuit (1), a rectifying and filtering circuit (7) connected with the power supply and used for converting the input alternating current into direct current, an energy storage circuit (3) connected with the MCU power supply circuit (2) and used for providing power energy, and a power supply signal conversion circuit (4) used for detecting the input control voltage, the device comprises a coil driving circuit (5) which is connected with the MCU power supply circuit (2) and used for driving the coil to be switched on and off, a micro-control chip U2 which is used for receiving a voltage detection signal of the power signal conversion circuit (4) and sending a zero-crossing pulse signal to the zero-crossing detection conversion circuit (6), and the zero-crossing detection conversion circuit (6) which is 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.
3. A method of controlling an arc-free ac circuit for breaking, according to claim 2, 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;
the rectifying and filtering circuit (7) comprises a diode D1 connected with the positive pole of a power supply and a capacitor C3 connected with a diode D1;
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) 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 a VBB pin of a driving chip U1 in the coil driving circuit (5);
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.
4. A method of controlling an arc-free ac circuit for breaking, according to claim 3, wherein: in the power supply step: the power supply is powered on, the anode of the power supply is rectified and filtered through a diode D1 and a capacitor C3, the power supply is serially connected with a plurality of diode arrays of a diode D2, a diode D3 and a diode D4 to reduce voltage, the capacitor C2 energy storage capacitor is charged through a resistor R2, and voltage with the voltage stabilizing value of 5V is connected with a voltage stabilizing diode DW1 in series through a resistor R1 and is connected to an analog voltage input Vref pin of a 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 MCU U2 are connected to the IN1 and IN2 pins of the driver U1, respectively.
5. A method of controlling an arc-free ac circuit for breaking, according to claim 2, 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.
6. A method of controlling an arc-free ac circuit for breaking, according to claim 2, 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;
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.
7. A method of controlling an arc-free ac circuit for breaking, according to claim 2, 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 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 the diode D10 in series and connected with a node of the diode D13 and the resistor R9.
8. A method of controlling an arc-free ac circuit for breaking, according to claim 7, wherein: IN the closing step, when the AD input end AN10 of the micro-control chip U2 detects that the control power supply voltage is greater than the coil voltage set value of the electromagnetic actuating mechanism and the P1.7 of the micro-control chip U2 detects a falling edge, the IN2 is set to be at a high level and the IN1 is set to be at a low level after the program control of the micro-control chip U2 is delayed; 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 program of the micro control chip U2 controls the IN2 low level, the IN2 pin 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 de-electrified, and the coil current is zero.
9. A method of controlling an arc-free ac circuit for breaking, according to claim 7, wherein: in the disconnection step: when the control power supply is disconnected or the AD of the micro-control chip U2 detects that the input control voltage is lower than the voltage 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 and power supply to the power supply signal conversion circuit (4) is forbidden;
the pin P1.7 of the micro-control chip U2 detects a falling edge, the pin IN1 is controlled to be set at a high level, the output of the pin OUT1 and the pin OUT2 of the driving chip U1 are turned over instantly, the pin OUT2 outputs a negative pole, the pin OUT1 outputs a positive pole, the coil of the electromagnetic actuating mechanism gets electricity under the action of the energy storage capacitor C2, the state of the magnetic force direction of the electromagnet is turned over, the electromagnetic actuating mechanism keeps a disconnected state under the action of a permanent magnet, the micro-control chip U2 controls the pin IN1 to be at a low level, the pin IN1 of the driving chip U1 is pulled down, the pins OUT1 and the pin OUT2 of the driving chip U1 output a high resistance, the coil of the electromagnetic actuating mechanism loses electricity, and the coil current is zero.
10. A method of controlling an arc-free ac circuit for breaking, according to claim 3, wherein: 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 micro-control chip U2 further comprises an RXD pin for communication, a TXD pin, an INT1 pin for a programming interface, an INT1 pin, a TDI pin and a TCK pin.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210329046.2A CN114415580B (en) | 2022-03-31 | 2022-03-31 | Control method of arc-free disjunction alternating current circuit |
| PCT/CN2022/116598 WO2023184855A1 (en) | 2022-03-31 | 2022-09-01 | Control method for arcless breaking alternating current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210329046.2A CN114415580B (en) | 2022-03-31 | 2022-03-31 | Control method of arc-free disjunction alternating current circuit |
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| CN114415580A true CN114415580A (en) | 2022-04-29 |
| CN114415580B CN114415580B (en) | 2022-06-14 |
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Cited By (1)
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| WO2023184855A1 (en) * | 2022-03-31 | 2023-10-05 | 南京全宁电器有限公司 | Control method for arcless breaking alternating current circuit |
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| CN114415580B (en) | 2022-06-14 |
| WO2023184855A1 (en) | 2023-10-05 |
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