A high-efficiency and energy-saving contactor control circuit

Abstract

The invention discloses an efficient and energy-saving electromagnetic control circuit, belonging to the technical field of contactors, comprising: a full-bridge drive chip U1 for controlling the function of the contactor, an energy storage circuit connected to a power supply, a voltage stabilizing circuit connected to the energy storage circuit and stabilizing an input voltage and sending it to the full-bridge drive chip U1, a voltage signal detection and regulation circuit connected to the power supply and used for detecting and regulating the input voltage signal and filtering overvoltage protection, a three-level inverter connected to the voltage signal detection and regulation circuit, a pull-in delay regulation circuit for controlling the output of the pull-in voltage so that the coil of the contactor KM is energized in the forward direction and then delayed to be turned off, and a release delay regulation circuit for controlling the output of the release voltage so that the coil of the contactor KM is energized in the reverse direction and then delayed to be turned off; the efficient and energy-saving contactor control circuit has obvious energy-saving effect, and the energy-saving effect can reach more than 98%; and single-line inching control opening and closing is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic control, and in particular relates to a high-efficiency and energy-saving contactor control circuit. Background Art

[0002] Compared with ordinary contactors, the biggest difference between magnetic latching contactors is that they are mainly used in intensive installation environments or special equipment for high current on / off control. Its main feature is that the on / off operation of the main circuit only requires a positive or reverse instantaneous pulse to be applied to the coil. Because permanent magnetic materials are used as the main circuit closing power, the main circuit contact pressure is large, the working voltage is high, the contact resistance is small, energy-saving and environmentally friendly, and the operation is reliable under ultra-long-term operation conditions, and the coil generates almost no energy consumption. After the ordinary contactor is pulled in, the coil is always energized, the long-term working energy consumption is large, the coil heats up, and even noise exists for a long time, which not only wastes electricity but also shortens the service life of the insulation due to the heating of the coil.

[0003] The magnetic holding contactor needs a pulse voltage in the forward or reverse state to control the on and off. Compared with ordinary contactors, the control circuit is complicated. If it is to be used in some traditional application areas of machine tool electrical control, the control circuit must be changed. The circuit change is particularly complicated and the reliability is poor. The biggest problem is that it cannot solve the problem of power failure and cannot be disconnected. Safety cannot be guaranteed and it cannot be widely used in general logic control electrical circuits. Therefore, it is necessary to develop a new type of contactor circuit to solve the existing problems. Summary of the invention

[0004] The object of the present invention is to provide a highly efficient and energy-saving contactor control circuit to solve the problem that a magnetic latching contactor cannot be opened and closed by single-line inching control.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an energy-efficient contactor control circuit, comprising: a full-bridge drive chip U1 for controlling the function of the contactor KM, an energy storage circuit connected to a power supply, a voltage stabilizing circuit connected to the energy storage circuit and stabilizing the input voltage and sending it to the full-bridge drive chip U1, a voltage signal detection and regulation circuit connected to the power supply and used for detecting and regulating the input voltage signal and filtering overvoltage protection, a three-stage inverter connected to the voltage signal detection and regulation circuit, a pull-in delay regulation circuit for controlling the output of the pull-in voltage so that the coil of the contactor KM is energized in the forward direction and then delayed to turn off, and a release delay regulation circuit for controlling the output of the release voltage so that the coil of the contactor KM is energized in the reverse direction and then delayed to turn off;

[0006] The pull-in delay adjustment circuit and the release delay adjustment circuit are both connected to the three-stage inverter.

[0007] Preferably, the energy storage circuit includes a diode D10, a diode D3 connected to one end of the diode D10 for generating a reverse electromotive force when the absorption coil is working, and an energy storage capacitor C1 connected to the other end of the diode D10;

[0008] The diode D10 is connected in parallel with a resistor R8 , and a node among the resistor R8 , the diode D3 , and the diode D10 is connected to a VBB pin of the full-bridge driver chip U1 .

[0009] Preferably, the voltage stabilizing circuit includes a voltage stabilizing diode DW2 and a resistor R1 connected to the voltage stabilizing diode DW2; the resistor R1 and the VBB pin of the full-bridge driver chip U1 are both connected to the positive pole of the power supply, and the node between the resistor R1 and the voltage stabilizing diode DW2 is connected to the Vref pin of the full-bridge driver chip U1.

[0010] Preferably, the voltage signal detection and adjustment circuit includes a voltage regulator tube DW1, an energy storage capacitor C3 and a resistor R5 connected in parallel to the voltage regulator tube DW1, and a resistor R4 connected to the voltage regulator tube DW1, wherein the resistor R4 is also connected to the positive electrode of the power supply, wherein the resistance ratio of the resistor R4 and the resistor R5 is adjusted to adjust the pull-in and release voltage flip thresholds during the slow rise or fall of the power supply voltage.

[0011] Preferably, the three-stage inverter includes three first-stage inverters U2A, second-stage inverters U2B, and third-stage inverters U2C connected in series; the first-stage inverter U2A is connected to the node of the voltage regulator DW1 and the resistor R4, the output end of the second-stage inverter U2B obtains a level signal synchronized with the input, and the output end of the third-stage inverter U2C obtains a level signal inverted from the input end of the first-stage inverter U2A.

[0012] Preferably, the pull-in delay adjustment circuit includes a transistor V1, a resistor R2 and a resistor R3 connected to the base of the transistor V1, a resistor R6 connected to the collector of the transistor V1, and an energy storage capacitor C2 connected in series to the resistor R3; the node between the resistor R6 and the transistor V1 is connected to the IN2 pin of the full-bridge driver chip U1, wherein the capacitance value of C2 and the resistance ratio of the resistor R2 and the resistor R3 are adjusted so that when the output end of the second-stage inverter U2B flips from low to high, the capacitor C2 is charged, and when the voltage across the capacitor C2 reaches the conduction threshold of the collector of the transistor V1, the delay duration of the high-level signal of the IN2 pin of the full-bridge driver chip U1 is controlled.

[0013] Preferably, the release delay circuit includes a transistor V2, a resistor R11 connected to the base of the transistor V2, an energy storage capacitor C4, a resistor R10 connected in parallel to the energy storage capacitor C4, and a resistor R9 connected to the collector of the transistor V2; one end of the resistor R9 is connected to the third-stage inverter U2C, and the other end of the resistor R9 is connected to the transistor V2 and then to the IN1 pin of the full-bridge driver chip U1, wherein the capacitance value of C4 and the resistance ratio of the resistor R11 and the resistor R10 are adjusted so that when the output end of the third-stage inverter U2C flips from low to high, the capacitor C4 is charged, and when the voltage across the capacitor C4 reaches the conduction threshold of the collector of the transistor V2, the delay duration of the high-level signal of the IN1 pin of the full-bridge driver chip U1 is controlled.

[0014] Preferably, the Lss pin of the full-bridge driver chip U1 is connected to one end of a resistor R7 for current limiting protection, the other end of the resistor R7 is connected in series with a diode D4 and a diode D2, one end of the diode D2 is connected to a node of a diode D10 and a resistor R1, the node of the resistor R7 and the diode D4 is connected to one end of a diode D5, the other end of the diode D5 is connected to the other end of the diode D3, the OUT1 pin and the OUT2 pin of the full-bridge driver chip U1 are connected to the contactor KM coil, and the OUT2 pin of the full-bridge driver chip U1 is connected to the contactor KM coil and then connected to the node of a diode D3 and a diode D5.

[0015] Preferably, the input end of the power supply is provided with a rectifier for converting AC voltage into DC voltage.

[0016] Preferably, a transformer is provided at the input end of the rectifier.

[0017] The technical effects and advantages of the present invention are as follows: the high-efficiency and energy-saving contactor control circuit has a simplified circuit, a small size, and a low cost. A voltage-stabilizing diode DW1 is used to prevent the three-stage inverter from being damaged during power increase or debugging. The reverse electromotive force generated when the coil is working can be absorbed by diodes D2, D3, D4, and D5, and R7 is used as a current-limiting protection sampling resistor. The present invention enables the magnetic latching contactor to completely replace the traditional energy-saving control module of the ordinary contactor. The installation and wiring are simple and convenient, and the energy-saving effect is obvious, and the energy-saving effect can reach more than 98%. The magnetic latching contactor using the control module can have the characteristics of an ordinary non-magnetic latching contactor, realize single-line inching control opening and closing, and retain all the advantages of the magnetic latching contactor. In addition, the second-stage inverter in the present circuit Resistors R2 and R3 at the output end of U2B are connected in series to divide the voltage and then connected to the base of transistor V1 to charge capacitor C2. When the charging voltage reaches the conduction threshold of transistor V1, the level of IN2 pin of full-bridge driver chip U1 is pulled low, and OUT1 and OUT2 pins of full-bridge driver chip U1 output high resistance, the contactor KM coil loses power, and the coil current is zero; in this state, contactor KM relies on the permanent magnet to keep the main circuit contacts closed, and the contactor KM coil current is zero. At this time, the coil has zero power consumption. In this state, the energy consumption of the voltage divider resistor, voltage regulator tube, and chip in the circuit adds up to about 0.2W. The maintenance power of a general contactor is about 10W-30W. Compared with the power consumption of 0.2W, the contactor KM coil control circuit is in a micro-power consumption state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a control circuit diagram when the power supply of the present invention is direct current;

[0019] Figure 2 This is a control circuit diagram when the power supply of the present invention is AC or DC;

[0020] Figure 3 This is a control circuit diagram of the present invention when the power supply is connected to an AC 0V-1500V;

[0021] Figure 4 This is a functional framework diagram of the full-bridge driver chip U1 of the present invention;

[0022] Figure 5 FIG. 4 is a pin distribution diagram of the full-bridge driver chip U1 of the present invention.

[0023] In the figure: 1. Energy storage circuit; 2. Voltage stabilizing circuit; 3. Voltage signal detection circuit; 4. Three-stage inverter; 5. Pull-on delay adjustment circuit; 6. Release delay adjustment circuit. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The present invention provides Figure 1-5 A highly efficient and energy-saving contactor control circuit is shown in Figure 1 and Figure 4 As shown, it includes: a full-bridge drive chip U1 for controlling the function of the contactor KM, an energy storage circuit 1 connected to a power supply, a voltage stabilizing circuit 2 connected to the energy storage circuit 1 and sending the input voltage to the full-bridge drive chip U1 after stabilizing the voltage, a voltage signal detection and regulation circuit 3 connected to the power supply for detecting and regulating the input voltage signal and filtering overvoltage protection, a three-stage inverter 4 connected to the voltage signal detection and regulation circuit 3, a pull-in delay regulation circuit 5 for controlling the output of the pull-in voltage so that the coil of the contactor KM is energized in the forward direction and then delayed to turn off, and a release delay regulation circuit 6 for controlling the output of the release voltage so that the coil of the contactor KM is energized in the reverse direction and then delayed to turn off;

[0026] The pull-in delay adjustment circuit 5 and the release delay adjustment circuit 6 are both connected to the three-stage inverter 4 .

[0027] The energy storage circuit 1 includes a diode D10, a diode D3 connected to one end of the diode D10 for generating a reverse electromotive force when the absorption coil is working, and an energy storage capacitor C1 connected to the other end of the diode D10;

[0028] Wherein, the diode D10 is connected in parallel with a resistor R8, and the node of the resistor R8, the diode D3, and the diode D10 is connected to the VBB pin of the full-bridge driver chip U1, and the positive voltage provides a power supply voltage to the VBB pin of the full-bridge driver chip U1 through the diode D1, and at the same time charges the C1 energy storage capacitor through the buffer resistor R8;

[0029] The voltage stabilizing circuit 2 includes a voltage stabilizing tube DW2 and a resistor R1 connected to the voltage stabilizing tube DW2; the resistor R1 and the VBB pin of the full-bridge driver chip U1 are both connected to the positive electrode of the power supply, and the node between the resistor R1 and the voltage stabilizing tube DW2 is connected to the Vref pin of the full-bridge driver chip U1. In this embodiment, the resistor R1 and the voltage stabilizing tube DW2 are divided into a voltage with a stabilizing value of 5V and connected to the analog voltage input Vref pin of the full-bridge driver chip U1. Figure 5 As shown;

[0030] The voltage signal detection and adjustment circuit 3 includes a voltage regulator tube DW1, an energy storage capacitor C3 and a resistor R5 connected in parallel to the voltage regulator tube DW1, and a resistor R4 connected to the voltage regulator tube DW1, wherein the resistor R4 is also connected to the positive electrode of the power supply, wherein the resistance ratio of the resistor R4 and the resistor R5 is adjusted to adjust the pull-in and release voltage flip thresholds during the slow rise or fall of the power supply voltage, and the pull-in characteristics during the slow rise of the power supply voltage can be adjusted to adjust the pull-in voltage value during the slow rise of the power supply voltage. In this embodiment, U2 is prevented from being damaged during power increase or debugging; the output end of the second-stage inverter U2B obtains a level signal synchronized with the input, and the output end of the third-stage inverter U2C obtains a level signal that is inverted with the input end of the first-stage inverter U2A.

[0031] The three-stage inverter 4 includes three first-stage inverters U2A, second-stage inverters U2B, and third-stage inverters U2C connected in series; the second-stage inverter U2B is connected to the node of the voltage regulator tube DW1 and the resistor R4, the output end of the second-stage inverter U2B obtains a level signal synchronized with the input, and is connected to the IN2 pin of the full-bridge driver chip U1 through the resistor R6; the output end of the third-stage inverter U2C obtains a level signal inverted from the input end of the first-stage inverter U2A, and is connected to the IN2 pin of the full-bridge driver chip U1 through the resistor R6. Resistor R9 is connected to the IN1 pin of the full-bridge driver chip U1, and the positive pole of the power supply is connected to the input end of the three-stage inverter 4 after being divided by resistors R4 and R5; according to the truth table of the full-bridge driver chip U1, see Table 1, the OUT1 pin of the full-bridge driver chip U1 outputs the positive pole, and the OUT2 pin of the full-bridge driver chip U1 outputs the negative pole of the power supply voltage, the contactor KM coil is energized, and the direction of the magnetic force generated by the coil is reversed, and the main circuit contact of the contactor KM remains closed under the action of the attracted permanent magnet;

[0032]

[0033] Table 1

[0034] The pull-in delay adjustment circuit 5 includes a transistor V1, a resistor R2 and a resistor R3 connected to the base of the transistor V1, a resistor R6 connected to the collector of the transistor V1, and an energy storage capacitor C2 connected in series to the resistor R3; the node of the resistor R6 and the transistor V1 is connected to the IN2 pin of the full-bridge driver chip U1, wherein the capacitance value of the C2 and the resistance ratio of the resistor R2 and the resistor R3 are adjusted so that when the output level of the second-stage inverter U2B is reversed from low to high, the delay duration of the high-level signal of the IN2 pin of the full-bridge driver chip U1 is controlled; at the same time as the power supply is turned on, the resistors R2 and R3 at the output end of the second-stage inverter U2B are connected in series to divide the voltage and then connected to the transistor V1 The base charges the capacitor C2. When the charging voltage reaches the conduction threshold of the transistor V1, the level of the IN2 pin of the full-bridge driver chip U1 is pulled low. According to the truth table of the full-bridge driver chip U1, the OUT1 and OUT2 pins of the full-bridge driver chip U1 output high resistance, the contactor KM coil loses power, and the coil current is zero; at this time, the contactor relies on the permanent magnet to keep the main circuit contact closed. At this time, the coil has zero power consumption. In this state, the energy consumption of the voltage divider resistor, the voltage regulator tube, and the chip in the circuit adds up to about 0.2W. The maintenance power of the general contactor is about 10W-30W. Compared with the power consumption of 0.2W, in this embodiment, the contactor KM coil control circuit is in a micro-power consumption state;

[0035] The release delay circuit 6 includes a transistor V2, a resistor R11 connected to the base of the transistor V2, an energy storage capacitor C4, a resistor R10 connected in parallel to the energy storage capacitor C4, and a resistor R9 connected to the collector of the transistor V2; one end of the resistor R9 is connected to the third-stage inverter U2C, and the other end of the resistor R9 is connected to the transistor V2 and then to the IN1 pin of the full-bridge driver chip U1, and the capacitance value of C4 and the resistance ratio of the resistor R11 and the resistor R10 are adjusted, so that when the output level of the third-stage inverter U2C is flipped from low to high, the delay duration of the high-level signal of the IN2 pin of the full-bridge driver chip U1 is controlled, and when the power is cut off, the energy storage capacitor C1 discharges through the diode D10 to continue to drive the full-bridge. Chip U1 provides electric energy. Since diode D1 is reversely cut off, a high level appears at the third inverting output terminal of three-stage inverter 4. According to the truth table, the outputs of OUT1 and OUT2 pins of full-bridge driver chip U1 are instantly reversed. OUT1 pin of full-bridge driver chip U1 outputs negative pole, and OUT2 pin of full-bridge driver chip U1 outputs positive pole. Contactor KM coil is energized by energy storage capacitor C1, and the magnetic direction of the coil is reversed. Under the action of releasing permanent magnet, the main circuit contact of contactor KM remains disconnected. Resistor R10 and resistor R11 at the output terminal of third-stage inverter U2C are connected in series to divide the voltage and then connected to the base of transistor V2. At the same time, capacitor C4 is charged. When the voltage across capacitor C4 reaches the base of transistor V2, After the conduction threshold is reached, the delay duration of the high-level signal of the IN1 pin of the full-bridge driver chip U1 is controlled, and the level of the IN2 pin of the full-bridge driver chip U1 is pulled low. According to the truth table of the full-bridge driver chip U1, the OUT1 pin and OUT2 pin of the full-bridge driver chip U1 output high resistance, the contactor KM coil loses power, and the coil current is instantly zero. The function of this circuit is to reverse the power supply of the coil and release the delay adjustment circuit to send a power-off signal to the full-bridge driver chip U1, so that the coil quickly enters the zero current state after power failure, to prevent the coil from being energized under low voltage; the coil loses power immediately after the power delay, and the coil obtains two voltage pulse signals with opposite polarities in the two states of control power on and power off, thereby realizing the magnetic holding contactor and the non-magnetic holding contactor. The contactor has the same pull-in characteristics and has the purpose of high efficiency and energy saving; the Lss pin of the full-bridge driver chip U1 is connected to one end of the resistor R7 for current limiting protection, the other end of the resistor R7 is connected to the diode D4 and the diode D2, one end of the diode D2 is connected to the node of the diode D10 and the resistor R1, the node of the resistor R7 and the diode D4 is connected to one end of the diode D5, the other end of the diode D5 is connected to the other end of the diode D3, the OUT1 pin and the OUT2 pin of the full-bridge driver chip U1 are connected to the contactor KM coil, and the OUT2 pin of the full-bridge driver chip U1 is connected to the contactor KM coil and then connected to the node of the diode D3 and the diode D5.

[0036] like Figure 2 As shown, if the control power supply is universal for AC and DC, the input end of the power supply is connected to the power supply through a rectifier, and the rectifier converts the AC voltage into a DC voltage;

[0037] like Figure 3 As shown, if the connected control power supply is AC high voltage, it is connected to the input end of the rectifier through a transformer.

[0038] The high-efficiency and energy-saving contactor control circuit has a simplified circuit, a small size, and a low cost. The voltage-stabilizing diode DW1 is used to prevent the three-stage inverter from being damaged during power increase or debugging. The reverse electromotive force generated when the coil is working can be absorbed by diodes D2, D3, D4, and D5, and R7 is used as a current-limiting protection sampling resistor. The circuit enables the magnetic latching contactor to completely replace the energy-saving control module of the traditional ordinary contactor. The installation and wiring are simple and convenient, and the energy-saving effect is obvious, and the energy-saving effect can reach more than 98%. The magnetic latching contactor using the control module can have the characteristics of an ordinary non-magnetic latching contactor, realize single-line inching control opening and closing, and retain all the advantages of the magnetic latching contactor.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly efficient and energy-saving contactor control circuit, characterized in that: include: A full-bridge driver chip U1 for controlling the function of the contactor KM, an energy storage circuit connected to a power supply, a voltage stabilizing circuit connected to the energy storage circuit and stabilizing the input voltage and sending it to the full-bridge driver chip U1, a voltage signal detection and regulation circuit connected to the power supply for detecting and regulating the input voltage signal and filtering overvoltage protection, a three-stage inverter connected to the voltage signal detection and regulation circuit, a pull-in delay regulation circuit for controlling the output of the pull-in voltage so that the coil of the contactor KM is energized in the forward direction and then delayed to turn off, and a release delay regulation circuit for controlling the output of the release voltage so that the coil of the contactor KM is energized in the reverse direction and then delayed to turn off; The pull-in delay adjustment circuit and the release delay adjustment circuit are both connected to the three-stage inverter; The three-stage inverter includes three first-stage inverters U2A, second-stage inverters U2B, and third-stage inverters U2C connected in series; the first-stage inverter U2A is connected to the node of the voltage regulator tube DW1 and the resistor R4, the output end of the second-stage inverter U2B obtains a level signal synchronized with the input, and the output end of the third-stage inverter U2C obtains a level signal inverted from the input end of the first-stage inverter U2A; The pull-in delay adjustment circuit includes a transistor V1, a resistor R2 and a resistor R3 connected to the base of the transistor V1, a resistor R6 connected to the collector of the transistor V1, and an energy storage capacitor C2 connected in series to the resistor R3; the node of the resistor R6 and the transistor V1 is connected to the IN2 pin of the full-bridge driver chip U1, wherein the capacitance value of C2 and the resistance ratio of the resistor R2 and the resistor R3 are adjusted so that when the output end of the second-stage inverter U2B flips from low to high, the capacitor C2 is charged, and when the voltage across the capacitor C2 reaches the conduction threshold of the collector of the transistor V1, the delay duration of the high-level signal of the IN2 pin of the full-bridge driver chip U1 is controlled; The release delay adjustment circuit includes a transistor V2, a resistor R11 connected to the base of the transistor V2, an energy storage capacitor C4, a resistor R10 connected in parallel to the energy storage capacitor C4, and a resistor R9 connected to the collector of the transistor V2; one end of the resistor R9 is connected to the third-stage inverter U2C, and the other end of the resistor R9 is connected to the transistor V2 and then to the IN1 pin of the full-bridge driver chip U1; wherein, the capacitance value of C4 and the resistance ratio of the resistor R11 and the resistor R10 are adjusted so that when the output end of the third-stage inverter U2C flips from low to high, the capacitor C4 is charged, and when the voltage across the capacitor C4 reaches the conduction threshold of the collector of the transistor V2, the delay duration of the high-level signal of the IN1 pin of the full-bridge driver chip U1 is controlled; The Lss pin of the full-bridge driver chip U1 is connected to one end of a resistor R7 for current limiting protection, the other end of the resistor R7 is connected in series with a diode D4 and a diode D2 that generate a reverse electromotive force when the absorption coil is working, one end of the diode D2 is connected to a node of a diode D10 and a resistor R1, the node of the resistor R7 and the diode D4 is connected to one end of a diode D5 that generates a reverse electromotive force when the absorption coil is working, the other end of the diode D5 is connected to the other end of the diode D3, the OUT1 pin and the OUT2 pin of the full-bridge driver chip U1 are connected to the contactor KM coil, and the OUT2 pin of the full-bridge driver chip U1 is connected to the contactor KM coil and then connected to the node of the diode D3 and the diode D5.

2. The high-efficiency and energy-saving contactor control circuit according to claim 1, characterized in that: The energy storage circuit includes a diode D10, a diode D3 connected to one end of the diode D10 for generating a reverse electromotive force when the absorption coil is working, and an energy storage capacitor C1 connected to the other end of the diode D10; The diode D10 is connected in parallel with a resistor R8 , and a node among the resistor R8 , the diode D3 , and the diode D10 is connected to a VBB pin of the full-bridge driver chip U1 .

3. The high-efficiency and energy-saving contactor control circuit according to claim 1, characterized in that: The voltage stabilizing circuit includes a voltage stabilizing tube DW2 and a resistor R1 connected to the voltage stabilizing tube DW2; the resistor R1 and the VBB pin of the full-bridge driver chip U1 are both connected to the positive pole of the power supply, and the node between the resistor R1 and the voltage stabilizing tube DW2 is connected to the Vref pin of the full-bridge driver chip U1.

4. The high-efficiency and energy-saving contactor control circuit according to claim 1, characterized in that: The voltage signal detection and adjustment circuit includes a voltage regulator tube DW1, a filter capacitor C3 and a resistor R5 connected in parallel to the voltage regulator tube DW1, and a resistor R4 connected to the voltage regulator tube DW1, wherein the resistor R4 is also connected to the positive electrode of the power supply, wherein the resistance ratio of the resistor R4 and the resistor R5 is adjusted to adjust the pull-in and release voltage flip thresholds during the slow rise or fall of the power supply voltage.

5. The high-efficiency and energy-saving contactor control circuit according to any one of claims 1 to 4, characterized in that: The input end of the power supply is provided with a rectifier for converting AC voltage into DC voltage.

6. The high-efficiency and energy-saving contactor control circuit according to claim 5, characterized in that: A transformer is provided at the input end of the rectifier.

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