A voltage regulator control circuit using an AC brushless motor

Abstract

A voltage stabilizer control circuit using an AC brushless motor, wherein the power circuit converts the AC low voltage inputted by the power input terminal S1 into a DC power supply voltage, and provides power to the entire circuit after voltage stabilization; the two-level integration of the resistor and capacitor in the sampling circuit prevents abnormal interference and provides a sampling signal for the comparison circuit; the reference circuit stabilizes the high voltage into a reference voltage to ensure the constancy of the reference voltage when the main circuit power supply fluctuates; the comparison circuit compares the sampling signal with the reference threshold to output a corresponding motor drive signal; the relay in the motor drive circuit is interlocked to ensure that only one motor drive signal is output at a time. The present invention uses an AC brushless synchronous motor to replace a DC brushed motor, changes the mode of driving the motor by a transistor from direct drive to indirect drive, uses a relay to replace a power transistor, and the relay contact has a strong overload capacity and an isolation effect, which solves the problem of a high failure rate of the control circuit of the supporting DC motor in the existing contact voltage stabilizer.

Description

Technical Field

[0001] The invention belongs to the technical field of voltage stabilizers, and in particular relates to a voltage stabilizer control circuit using an AC brushless motor. Background Art

[0002] The contact-type automatic AC voltage stabilizer is composed of a specially designed voltage regulator or transformer and a controller or control circuit. It is a closed-loop control system that achieves the purpose of stabilizing the output voltage through automatic adjustment. The voltage stabilizer mainly uses the contact position of the servo motor drive brush to change the turns ratio of the primary winding and the secondary winding to achieve a regulated output. At present, the servo motor inside the contact-type voltage stabilizer products on the market is mainly composed of a DC brushed micromotor and a reduction mechanism. Its control circuit is mainly a circuit for driving a DC motor, and driving a DC motor requires semiconductor devices such as high-power transistors. There are brushes inside the DC motor. When the brushes are worn, a short circuit or an increase in current can easily lead to damage to the high-power transistor. Such problems need to be solved urgently. Summary of the invention

[0003] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a voltage stabilizer control circuit using an AC brushless motor.

[0004] The above technical problem of the present invention is mainly solved by the following technical solution: A voltage regulator control circuit using an AC brushless motor includes a power supply circuit, a sampling circuit, a reference circuit, a comparison circuit, and a motor drive circuit, and the specific structure is:

[0005] The power supply circuit includes a power input terminal S1, a diode D3, a diode D4, a diode D5, a diode D6, a capacitor C3, a capacitor C6, a resistor R4, a resistor R17, a voltage regulator diode Z1, a voltage regulator diode Z3, a capacitor C5, a capacitor C8, a capacitor C14, a capacitor C15, a capacitor C4, and a capacitor C7, wherein pin 1 of the power input terminal S1 is respectively connected to the positive end of the diode D4 and the negative end of the diode D6, pin 3 of the power input terminal S1 is respectively connected to the positive end of the diode D3 and the negative end of the diode D5, and the negative end of the diode D3 and the negative end of the diode D4. The positive end of the diode D5 and the positive end of the diode D6 are connected in parallel. The negative end of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the positive end of the capacitor C4 are connected in parallel, and then the resistor R4 is connected in series, and then the parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 is connected. The positive end of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the negative end of the capacitor C4 are connected in parallel and then connected to the 2nd pin of the power input terminal S1. The positive end of the voltage zener diode Z3, the capacitor C8, the capacitor C15, and the negative end of the capacitor C7 are connected in parallel, and then the resistor R17 is connected in series, and then the parallel connection point of the positive end of the diode D5 and the positive end of the diode D6 is connected. The negative end of the voltage zener diode Z3, the positive ends of capacitors C8, C15 and C7 are connected in parallel and connected to pin 2 of the power input terminal S1. The parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 and the series connection point of the resistor R4 are connected to the positive end of the capacitor C3. The negative end of the capacitor C3 is connected to pin 2 of the power input terminal S1. The parallel connection point of the positive end of the diode D5 and the positive end of the diode D6 and the series connection point of the resistor R17 are connected to the negative end of the capacitor C6. The positive end of the capacitor C6 is connected to pin 2 of the power input terminal S1. The parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 leads to the power supply +VCC terminal. The power supply +VCC end is led out to the driving power supply +VCC2 end after current limiting and voltage division by power resistor R47, the parallel connection point of the positive end of diode D5 and the positive end of diode D6 is led out to the power supply -VCC end, the parallel connection point of the negative end of voltage zener diode Z1, capacitor C5, capacitor C14, and the positive end of capacitor C4 is led out to the stable power supply +VDD end, the parallel connection point of the positive end of voltage zener diode Z3, capacitor C8, capacitor C15, and the negative end of capacitor C7 is led out to the stable power supply -VDD end, and the power supply circuit converts the AC low voltage input from the power supply input terminal S1 into a DC power supply voltage, and provides power to the entire circuit after voltage stabilization.

[0006] The sampling circuit includes a diode D1, a diode D2, a resistor R1, a resistor R3, a capacitor C1, a resistor R2, and a capacitor C2, wherein the positive end of the diode D1 is connected to pin 3 of the power input terminal S1, the positive end of the diode D2 is connected to pin 1 of the power input terminal S1, the negative end of the diode D1 is connected in parallel with the negative end of the diode D2, the parallel connection point of the negative end of the diode D1 and the negative end of the diode D2 is connected in series with the resistor R3 and then grounded, and the other connection point is connected in series with the resistor R1 and the resistor R2 in sequence and then connected to the positive end of the capacitor C2, the series connection point of the resistor R1 and the resistor R2 is connected to the positive end of the capacitor C1, and the negative end of the capacitor C1 and the negative end of the capacitor C2 are grounded respectively, the resistor and the capacitor in the sampling circuit are integrated at the second level to prevent abnormal interference, and a sampling signal is provided for the comparison circuit at the series connection point QY_VOLTAGE of the resistor R2 and the positive end of the capacitor C2.

[0007] The reference circuit is composed of a stable power supply +VDD terminal provided by a power supply circuit, a resistor R5, a voltage-stabilizing diode Z2, and a resistor R9, wherein the stable power supply +VDD terminal is first connected in series with the resistor R5, and then connected in series with the resistor R9 to generate a reference voltage, and the other path is connected to the negative end of the voltage-stabilizing diode Z2, and the positive end of the voltage-stabilizing diode Z2 is grounded. The reference circuit stabilizes the high voltage into a reference voltage to ensure the constancy of the reference voltage when the main circuit power supply fluctuates.

[0008] The comparison circuit is composed of a resistor R7, a potentiometer RP1, a potentiometer RP2, a resistor R14, a resistor R15, a resistor R10, a resistor R6, a resistor R16, a resistor R12, a comparator U1A, and a comparator U1B, wherein one end of the resistor R7 is connected to the series connection point QY_VOLTAGE of the sampling circuit resistor R2 and the positive end of the capacitor C2, the other end is connected in series to a fixed end of the potentiometer RP1, the other fixed end of the potentiometer RP1 is connected in series to a resistor R15 and then to ground, the active end of the potentiometer RP1 is connected in series to a resistor R10 and then to the + input end of the comparator U1A, the other end is connected in series to a resistor R12 and then to the - input end of the comparator U1B, the active end of the potentiometer RP2 is connected in series to a resistor R9 in the reference circuit to obtain a reference voltage, the other end is connected in series to a resistor R6 and then to the - input end of the comparator U1A, one fixed end of the potentiometer RP2 is connected in series to a resistor R14 and then to ground, the other end is connected in series to a resistor R16 and then to the + input end of the comparator U1B, and the comparator U The positive end of the power supply of 1A is connected to the stable power supply +VDD end in the power supply circuit, and the negative end of the power supply of comparator U1A is connected to the stable power supply -VDD end in the power supply circuit. The reference voltage generated by the reference circuit is divided into two reference thresholds, the upper voltage threshold and the lower voltage threshold, by potentiometer RP2 and resistor R14, and input into comparator U1A and comparator U1B respectively. The sampling signal from QY_VOLTAGE is also input into comparator U1A and comparator U1B. When the sampling signal voltage is higher than the upper voltage threshold, the negative level output of comparator U1B turns off the motor drive signal, and the positive level output of comparator U1A turns off the motor drive signal. When the sampling signal voltage is lower than the lower voltage threshold, the negative level output of comparator U1A turns off the motor drive signal, and the positive level output of comparator U1B turns off the motor drive signal. When the sampling signal voltage is between the upper voltage threshold and the lower voltage threshold, comparator U1A and comparator U1B both output the negative level to turn off the motor drive signal, thereby reducing the situation where the drive circuit is online for a long time.

[0009] The motor drive circuit includes a resistor R13, a resistor R8, a transistor Q1, a transistor Q2, a diode D17, a diode D18, a relay J2, a relay J3, and an output interface S5, wherein one end of the resistor R13 is connected to the output end DOWN of the comparator U1A in the comparison circuit, and the other end is connected to the base of the transistor Q1, one end of the resistor R8 is connected to the output end UP of the comparator U1B in the comparison circuit, and the other end is connected to the base of the transistor Q2, the emitter of the transistor Q1 is connected to the emitter of the transistor Q2 and then grounded, the control coil of the relay J3 and the diode D17 are respectively connected between the collector of the transistor Q1 and the drive power supply +VCC2 end in the power supply circuit, the positive end of the diode D17 is connected to the collector of the transistor Q1, the negative end of the diode D17 is connected to the drive power supply +VCC2 end in the power supply circuit, and the collector of the transistor Q2 is connected to the drive power supply +VCC2 end in the power supply circuit. The control coil of relay J2 and diode D18 are connected respectively, the positive end of diode D18 is connected to the collector of transistor Q2, and the negative end of diode D18 is connected to the driving power supply +VCC2 end in the power supply circuit. The power supply +VCC is current-limited and voltage-divided by power resistor R47, and the +VCC2 provides a reliable driving power supply for relay J2 and relay J3 in the motor driving circuit. The normally open contact of relay J2 is connected to pin 1 of output interface S5, and the normally open contact of relay J3 is connected to pin 3 of output interface S5. The normally closed contacts of relay J2 and relay J3 are connected in parallel and connected to pin 2 of output interface S5. The output contacts of relay J2 and relay J3 adopt an interlocking structure. The motor power supply voltage is input through the normally closed contact of relay J2 and output through the normally open contact of relay J3, or input through the normally closed contact of relay J3 and output through the normally open contact of relay J2, to ensure that only one motor driving signal is output at a time.

[0010] The series combination of the parallel resistor R49 on the control coil of the relay J2 and the light-emitting diode LED3, and the series combination of the parallel resistor R48 on the control coil of the relay J3 and the light-emitting diode LED2 in the motor drive circuit serve as a drive signal indication circuit, which is convenient for debugging and repairing the circuit in large-scale production.

[0011] Preferably, a resistor R45 is connected in parallel between the + input terminal and the output terminal DOWN of the comparator U1A in the comparison circuit, so that the comparator U1A forms a hysteresis comparator; a resistor R46 is connected in parallel between the + input terminal and the output terminal UP of the comparator U1B in the comparison circuit, so that the comparator U1B forms a hysteresis comparator. The hysteresis comparator is conducive to the stability of the output signal, can improve the stability of the motor drive signal, and greatly improve the reliability of the circuit.

[0012] Preferably, an electrolytic capacitor C17 is connected in parallel to the control coil of the relay J2 in the motor drive circuit, the positive end of the electrolytic capacitor C17 is connected to the driving power supply +VCC2 end in the power supply circuit, and the negative end of the electrolytic capacitor C17 is connected to the collector of the transistor Q2; an electrolytic capacitor C16 is connected in parallel to the control coil of the relay J3, the positive end of the electrolytic capacitor C16 is connected to the driving power supply +VCC2 end in the power supply circuit, and the negative end of the electrolytic capacitor C16 is connected to the collector of the transistor Q1, so as to prevent the contacts from shaking when the relay is closed or released, which is beneficial to improving the service life of the relay.

[0013] The present invention uses an AC brushless synchronous motor to replace a DC brush motor, changes the mode of driving the motor by a transistor from direct drive to indirect drive, uses a relay to replace a power transistor, and has a strong overload capacity of the relay contact and an isolation effect, thereby solving the problem of high failure rate of the control circuit of the supporting DC motor in the existing contact type voltage stabilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a principle block diagram of the present invention;

[0015] Figure 2 It is a schematic diagram of the power supply circuit and the sampling circuit of the present invention;

[0016] Figure 3 It is a schematic diagram of the reference circuit and the comparison circuit of the present invention;

[0017] Figure 4 It is a schematic diagram of the motor drive circuit of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0019] Example: See Figure 1-Figure 4A voltage regulator control circuit for an AC brushless motor includes a power supply circuit, a sampling circuit, a reference circuit, a comparison circuit, and a motor drive circuit. The power supply circuit includes a power supply input terminal S1, a diode D3, a diode D4, a diode D5, a diode D6, a capacitor C3, a capacitor C6, a resistor R4, a resistor R17, a voltage regulator diode Z1, a voltage regulator diode Z3, a capacitor C5, a capacitor C8, a capacitor C14, a capacitor C15, a capacitor C4, and a capacitor C7, wherein pin 1 of the power supply input terminal S1 is respectively connected to the positive end of the diode D4 and the negative end of the diode D6, and pin 3 of the power supply input terminal S1 is respectively connected to the positive end of the diode D3 and the negative end of the diode D5, and the negative end of the diode D3 and the negative end of the diode D4. The positive end of the diode D5 and the positive end of the diode D6 are connected in parallel. The negative end of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the positive end of the capacitor C4 are connected in parallel, and then the resistor R4 is connected in series, and then the parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 is connected. The positive end of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the negative end of the capacitor C4 are connected in parallel and then connected to the 2nd pin of the power input terminal S1. The positive end of the voltage zener diode Z3, the capacitor C8, the capacitor C15, and the negative end of the capacitor C7 are connected in parallel, and then the resistor R17 is connected in series, and then the parallel connection point of the positive end of the diode D5 and the positive end of the diode D6 is connected. The negative end of the voltage zener diode Z3, the positive ends of capacitors C8, C15 and C7 are connected in parallel and connected to pin 2 of the power input terminal S1. The parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 and the series connection point of the resistor R4 are connected to the positive end of the capacitor C3. The negative end of the capacitor C3 is connected to pin 2 of the power input terminal S1. The parallel connection point of the positive end of the diode D5 and the positive end of the diode D6 and the series connection point of the resistor R17 are connected to the negative end of the capacitor C6. The positive end of the capacitor C6 is connected to pin 2 of the power input terminal S1. The parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 leads to the power supply +VCC terminal. The power supply +VCC terminal leads to the driving power supply +VCC2 terminal after the power resistor R47 limits the current and divides the voltage. The parallel connection point of the positive terminal of the diode D5 and the positive terminal of the diode D6 leads to the power supply -VCC terminal. The parallel connection point of the negative terminal of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the positive terminal of the capacitor C4 leads to the stable power supply +VDD terminal. The parallel connection point of the positive terminal of the voltage zener diode Z3, the capacitor C8, the capacitor C15, and the negative terminal of the capacitor C7 leads to the stable power supply -VDD terminal. The power supply circuit converts the AC low voltage input from the power supply input terminal S1 into a DC power supply voltage, and provides power to the entire circuit after voltage stabilization.The sampling circuit includes a diode D1, a diode D2, a resistor R1, a resistor R3, a capacitor C1, a resistor R2, and a capacitor C2, wherein the positive end of the diode D1 is connected to pin 3 of the power input terminal S1, the positive end of the diode D2 is connected to pin 1 of the power input terminal S1, the negative end of the diode D1 is connected in parallel with the negative end of the diode D2, the parallel connection point of the negative end of the diode D1 and the negative end of the diode D2 is connected in series with the resistor R3 and then grounded, and the other connection point is connected in series with the resistor R1 and the resistor R2 in sequence and then connected to the positive end of the capacitor C2, the series connection point of the resistor R1 and the resistor R2 is connected to the positive end of the capacitor C1, and the negative end of the capacitor C1 and the negative end of the capacitor C2 are connected in series with each other. Grounded, the resistor and capacitor in the sampling circuit are integrated twice to prevent abnormal interference, and the sampling signal is provided to the comparison circuit at the series connection point QY_VOLTAGE of the resistor R2 and the positive end of the capacitor C2; the reference circuit is composed of a stable power supply +VDD end provided by the power supply circuit, a resistor R5, a voltage regulator diode Z2, and a resistor R9, wherein the stable power supply +VDD end is first connected in series with the resistor R5, and then connected in series with the resistor R9 to generate a reference voltage, and the other way is connected to the negative end of the voltage regulator diode Z2, and the positive end of the voltage regulator diode Z2 is grounded, and the reference circuit stabilizes the high voltage into a reference voltage to ensure the constant reference voltage when the main circuit power supply fluctuates;The comparison circuit is composed of a resistor R7, a potentiometer RP1, a potentiometer RP2, a resistor R14, a resistor R15, a resistor R10, a resistor R6, a resistor R16, a resistor R12, a comparator U1A, and a comparator U1B, wherein one end of the resistor R7 is connected to the series connection point QY_VOLTAGE of the sampling circuit resistor R2 and the positive end of the capacitor C2, the other end is connected in series to a fixed end of the potentiometer RP1, the other fixed end of the potentiometer RP1 is connected in series to a resistor R15 and then to ground, the active end of the potentiometer RP1 is connected in series to a resistor R10 and then to the + input end of the comparator U1A, the other end is connected in series to a resistor R12 and then to the - input end of the comparator U1B, the active end of the potentiometer RP2 is connected in series to a resistor R9 in the reference circuit to obtain a reference voltage, the other end is connected in series to a resistor R6 and then to the - input end of the comparator U1A, one fixed end of the potentiometer RP2 is connected in series to a resistor R14 and then to ground, the other end is connected in series to a resistor R16 and then to the + input end of the comparator U1B, and the comparator U The positive end of the power supply of 1A is connected to the stable power supply +VDD end in the power supply circuit, and the negative end of the power supply of comparator U1A is connected to the stable power supply -VDD end in the power supply circuit. The reference voltage generated by the reference circuit is divided into two reference thresholds, the upper voltage threshold and the lower voltage threshold, by potentiometer RP2 and resistor R14, and input into comparator U1A and comparator U1B respectively. The sampling signal from QY_VOLTAGE is also input into comparator U1A and comparator U1B. When the sampling signal voltage is higher than the upper voltage threshold, the negative level output of comparator U1B turns off the motor drive signal, and the positive level output of comparator U1A turns off the motor drive signal. When the sampling signal voltage is lower than the lower voltage threshold, the negative level output of comparator U1A turns off the motor drive signal, and the positive level output of comparator U1B turns off the motor drive signal. When the sampling signal voltage is between the upper voltage threshold and the lower voltage threshold, comparator U1A and comparator U1B both output the negative level to turn off the motor drive signal, thereby reducing the situation where the drive circuit is online for a long time.The motor drive circuit includes a resistor R13, a resistor R8, a transistor Q1, a transistor Q2, a diode D17, a diode D18, a relay J2, a relay J3, and an output interface S5, wherein one end of the resistor R13 is connected to the output end DOWN of the comparator U1A in the comparison circuit, and the other end is connected to the base of the transistor Q1, one end of the resistor R8 is connected to the output end UP of the comparator U1B in the comparison circuit, and the other end is connected to the base of the transistor Q2, and the emitter of the transistor Q1 is connected to the emitter of the transistor Q2 and then grounded. The control coil of relay J3 and diode D17 are connected between the collector of transistor Q1 and the driving power supply +VCC2 terminal in the power supply circuit, respectively. The positive end of diode D17 is connected to the collector of transistor Q1, and the negative end of diode D17 is connected to the driving power supply +VCC2 terminal in the power supply circuit. The control coil of relay J2 and diode D18 are connected between the collector of transistor Q2 and the driving power supply +VCC2 terminal in the power supply circuit, respectively. The positive end of diode D18 is connected to the collector of transistor Q2, and the negative end of diode D18 is connected to the collector of transistor Q2. The driving power supply +VCC2 end in the power supply circuit is connected. The power supply +VCC2 after current limiting and voltage division by the power resistor R47 provides a reliable driving power supply for the relay J2 and the relay J3 in the motor driving circuit. The normally open contact of the relay J2 is connected to the 1st pin of the output interface S5, and the normally open contact of the relay J3 is connected to the 3rd pin of the output interface S5. The normally closed contacts of the relay J2 and the relay J3 are connected in parallel and connected to the 2nd pin of the output interface S5. The output contacts of the relay J2 and the relay J3 adopt an interlocking structure. The motor supply voltage is input through the normally closed contact of the relay J2 and output through the normally open contact of the relay J3, or input through the normally closed contact of the relay J3 and output through the normally open contact of the relay J2, ensuring that only one motor driving signal is output at a time; the series connection combination of the parallel resistor R49 and the light-emitting diode LED3 on the control coil of the relay J2 in the motor driving circuit, and the series connection combination of the parallel resistor R48 and the light-emitting diode LED2 on the control coil of the relay J3 are used as the driving signal indication circuit, which is convenient for debugging and repairing the circuit in large-scale production. Preferably, a resistor R45 is connected in parallel between the + input terminal and the output terminal DOWN of the comparator U1A in the comparison circuit, so that the comparator U1A forms a hysteresis comparator;A resistor R46 is connected in parallel between the + input terminal and the output terminal UP of the comparator U1B in the comparison circuit, so that the comparator U1B forms a hysteresis comparator. The hysteresis comparator is conducive to the smoothness of the output signal, can improve the stability of the motor drive signal, and greatly improve the reliability of the circuit. Preferably, an electrolytic capacitor C17 is connected in parallel to the control coil of the relay J2 in the motor drive circuit, the positive end of the electrolytic capacitor C17 is connected to the drive power supply +VCC2 terminal in the power supply circuit, and the negative end of the electrolytic capacitor C17 is connected to the collector of the transistor Q2, and an electrolytic capacitor C16 is connected in parallel to the control coil of the relay J3, the positive end of the electrolytic capacitor C16 is connected to the drive power supply +VCC2 terminal in the power supply circuit, and the negative end of the electrolytic capacitor C16 is connected to the collector of the transistor Q1, to prevent the contact from shaking when the relay is closed or released, which is beneficial to improve the service life of the relay. ;

[0020] The present invention uses an AC brushless synchronous motor to replace a DC brush motor, changes the mode of driving the motor by a transistor from direct drive to indirect drive, uses a relay to replace a power transistor, and has a strong overload capacity of the relay contact and an isolation effect, thereby solving the problem of high failure rate of the control circuit of the supporting DC motor in the existing contact type voltage stabilizer.

[0021] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A voltage regulator control circuit using an AC brushless motor, comprising a power supply circuit, a sampling circuit, a reference circuit, a comparison circuit, and a motor drive circuit, characterized in that: The power supply circuit includes a power input terminal S1, a diode D3, a diode D4, a diode D5, a diode D6, a capacitor C3, a capacitor C6, a resistor R4, a resistor R17, a voltage regulator diode Z1, a voltage regulator diode Z3, a capacitor C5, a capacitor C8, a capacitor C14, a capacitor C15, a capacitor C4, and a capacitor C7, wherein pin 1 of the power input terminal S1 is respectively connected to the positive end of the diode D4 and the negative end of the diode D6, pin 3 of the power input terminal S1 is respectively connected to the positive end of the diode D3 and the negative end of the diode D5, and the negative end of the diode D3 and the negative end of the diode D4. The positive end of the diode D5 and the positive end of the diode D6 are connected in parallel. The negative end of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the positive end of the capacitor C4 are connected in parallel, and then the resistor R4 is connected in series, and then the parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 is connected. The positive end of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the negative end of the capacitor C4 are connected in parallel and then connected to the 2nd pin of the power input terminal S1. The positive end of the voltage zener diode Z3, the capacitor C8, the capacitor C15, and the negative end of the capacitor C7 are connected in parallel, and then the resistor R17 is connected in series, and then the parallel connection point of the positive end of the diode D5 and the positive end of the diode D6 is connected. The negative end of the voltage zener diode Z3, the positive ends of capacitors C8, C15 and C7 are connected in parallel and connected to pin 2 of the power input terminal S1. The parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 and the series connection point of the resistor R4 are connected to the positive end of the capacitor C3. The negative end of the capacitor C3 is connected to pin 2 of the power input terminal S1. The parallel connection point of the positive end of the diode D5 and the positive end of the diode D6 and the series connection point of the resistor R17 are connected to the negative end of the capacitor C6. The positive end of the capacitor C6 is connected to pin 2 of the power input terminal S1. The parallel connection point of the negative end of the diode D3 and the negative end of the diode D4 leads to the power supply +VCC terminal. The power supply +VCC terminal leads to the driving power supply +VCC2 terminal after the power resistor R47 limits the current and divides the voltage. The parallel connection point of the positive terminal of the diode D5 and the positive terminal of the diode D6 leads to the power supply -VCC terminal. The parallel connection point of the negative terminal of the voltage zener diode Z1, the capacitor C5, the capacitor C14, and the positive terminal of the capacitor C4 leads to the stable power supply +VDD terminal. The parallel connection point of the positive terminal of the voltage zener diode Z3, the capacitor C8, the capacitor C15, and the negative terminal of the capacitor C7 leads to the stable power supply -VDD terminal. The power supply circuit converts the AC low voltage input from the power supply input terminal S1 into a DC power supply voltage, and provides power to the entire circuit after voltage stabilization. The sampling circuit includes a diode D1, a diode D2, a resistor R1, a resistor R3, a capacitor C1, a resistor R2, and a capacitor C2, wherein the positive end of the diode D1 is connected to pin 3 of the power input terminal S1, the positive end of the diode D2 is connected to pin 1 of the power input terminal S1, the negative end of the diode D1 is connected in parallel with the negative end of the diode D2, the parallel connection point of the negative end of the diode D1 and the negative end of the diode D2 is connected in series with the resistor R3 and then grounded, and the other connection point is connected in series with the resistor R1 and the resistor R2 in sequence and then connected to the positive end of the capacitor C2, the series connection point of the resistor R1 and the resistor R2 is connected to the positive end of the capacitor C1, and the negative end of the capacitor C1 and the negative end of the capacitor C2 are grounded respectively, the secondary integration of the resistor and the capacitor in the sampling circuit prevents abnormal interference, and the sampling signal is provided for the comparison circuit at the series connection point QY_VOLTAGE of the resistor R2 and the positive end of the capacitor C2; The reference circuit is composed of a stable power supply +VDD terminal provided by a power supply circuit, a resistor R5, a voltage zener diode Z2, and a resistor R9, wherein the stable power supply +VDD terminal is first connected in series with the resistor R5, and then connected in series with the resistor R9 to generate a reference voltage, and the other path is connected to the negative end of the voltage zener diode Z2, and the positive end of the voltage zener diode Z2 is grounded. The reference circuit stabilizes the high voltage into a reference voltage to ensure the constant reference voltage when the main circuit power supply fluctuates; The comparison circuit is composed of a resistor R7, a potentiometer RP1, a potentiometer RP2, a resistor R14, a resistor R15, a resistor R10, a resistor R6, a resistor R16, a resistor R12, a comparator U1A, and a comparator U1B, wherein one end of the resistor R7 is connected to the series connection point QY_VOLTAGE of the sampling circuit resistor R2 and the positive end of the capacitor C2, the other end is connected in series to a fixed end of the potentiometer RP1, the other fixed end of the potentiometer RP1 is connected in series to a resistor R15 and then to ground, the active end of the potentiometer RP1 is connected in series to a resistor R10 and then to the + input end of the comparator U1A, the other end is connected in series to a resistor R12 and then to the - input end of the comparator U1B, the active end of the potentiometer RP2 is connected in series to a resistor R9 in the reference circuit to obtain a reference voltage, the other end is connected in series to a resistor R6 and then to the - input end of the comparator U1A, one fixed end of the potentiometer RP2 is connected in series to a resistor R14 and then to ground, the other end is connected in series to a resistor R16 and then to the + input end of the comparator U1B, and the comparator U The positive end of the power supply of 1A is connected to the stable power supply +VDD end in the power supply circuit, and the negative end of the power supply of comparator U1A is connected to the stable power supply -VDD end in the power supply circuit. The reference voltage generated by the reference circuit is divided into two reference thresholds, the upper voltage threshold and the lower voltage threshold, by potentiometer RP2 and resistor R14, and input into comparator U1A and comparator U1B respectively. The sampling signal from QY_VOLTAGE is also input into comparator U1A and comparator U1B. When the sampling signal voltage is higher than the upper voltage threshold, the negative level output of comparator U1B turns off the motor drive signal, and the positive level output of comparator U1A turns off the motor drive signal. When the sampling signal voltage is lower than the lower voltage threshold, the negative level output of comparator U1A turns off the motor drive signal, and the positive level output of comparator U1B turns off the motor drive signal. When the sampling signal voltage is between the upper voltage threshold and the lower voltage threshold, comparator U1A and comparator U1B both output the negative level to turn off the motor drive signal, thereby reducing the situation where the drive circuit is online for a long time. The motor drive circuit includes a resistor R13, a resistor R8, a transistor Q1, a transistor Q2, a diode D17, a diode D18, a relay J2, a relay J3, and an output interface S5, wherein one end of the resistor R13 is connected to the output end DOWN of the comparator U1A in the comparison circuit, and the other end is connected to the base of the transistor Q1, one end of the resistor R8 is connected to the output end UP of the comparator U1B in the comparison circuit, and the other end is connected to the base of the transistor Q2, the emitter of the transistor Q1 is connected to the emitter of the transistor Q2 and then grounded, the control coil of the relay J3 and the diode D17 are respectively connected between the collector of the transistor Q1 and the drive power supply +VCC2 end in the power supply circuit, the positive end of the diode D17 is connected to the collector of the transistor Q1, the negative end of the diode D17 is connected to the drive power supply +VCC2 end in the power supply circuit, and the collector of the transistor Q2 is connected to the drive power supply +VCC2 end in the power supply circuit. The control coil of relay J2 and diode D18 are connected respectively, the positive end of diode D18 is connected to the collector of transistor Q2, the negative end of diode D18 is connected to the driving power supply +VCC2 end in the power supply circuit, and the power supply +VCC is +VCC2 after current limiting and voltage division by power resistor R47 to provide reliable driving power for relay J2 and relay J3 in the motor driving circuit, the normally open contact of relay J2 is connected to pin 1 of output interface S5, the normally open contact of relay J3 is connected to pin 3 of output interface S5, the normally closed contacts of relay J2 and relay J3 are connected in parallel to pin 2 of output interface S5, the output contacts of relay J2 and relay J3 adopt an interlocking structure, the motor power supply voltage is input through the normally closed contact of relay J2, and output through the normally open contact of relay J3, or input through the normally closed contact of relay J3, and output through the normally open contact of relay J2, to ensure that only one motor driving signal is output at a time; The series combination of the parallel resistor R49 and the light emitting diode LED3 on the control coil of the relay J2 in the motor drive circuit, and the series combination of the parallel resistor R48 and the light emitting diode LED2 on the control coil of the relay J3 serve as a drive signal indication circuit.

2. According to claim 1, a voltage regulator control circuit using an AC brushless motor is characterized in that A resistor R45 is connected in parallel between the + input terminal and the output terminal DOWN of the comparator U1A in the comparison circuit, so that the comparator U1A forms a hysteresis comparator; a resistor R46 is connected in parallel between the + input terminal and the output terminal UP of the comparator U1B in the comparison circuit, so that the comparator U1B forms a hysteresis comparator.

3. A voltage regulator control circuit using an AC brushless motor according to claim 1, characterized in that An electrolytic capacitor C17 is connected in parallel to the control coil of the relay J2 in the motor drive circuit, the positive end of the electrolytic capacitor C17 is connected to the drive power supply +VCC2 end in the power supply circuit, and the negative end of the electrolytic capacitor C17 is connected to the collector of the transistor Q2. An electrolytic capacitor C16 is connected in parallel to the control coil of the relay J3, the positive end of the electrolytic capacitor C16 is connected to the drive power supply +VCC2 end in the power supply circuit, and the negative end of the electrolytic capacitor C16 is connected to the collector of the transistor Q1, so as to prevent the contacts from shaking when the relay is closed or released.

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