Voltage stabilizing circuit, motor control circuit, motor and electric appliance

Abstract

The application provides a voltage stabilizing circuit, a motor control circuit, a motor and an electrical appliance. The voltage stabilizing circuit is used for stabilizing a working circuit, and comprises: an energy processing unit connected in parallel with the working circuit and capable of stabilizing the working circuit; a switching unit connected between the working circuit and the energy processing unit and used for controlling the on-off of the energy processing unit and the working circuit; and a control unit connected with the switching unit and used for controlling the state of the switching unit according to the output power of the working circuit, so that the energy processing unit is connected to or disconnected from the working circuit. The voltage stabilizing circuit has the functions of power factor correction and surge voltage absorption, and can also maintain the minimum value of the bus voltage.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electrical equipment, and in particular relates to a voltage stabilizing circuit, a motor control circuit, a motor and an electrical appliance. BACKGROUND

[0002] In the motor control circuit, as shown in the accompanying drawings, in order to solve the problem of surge voltage, a small-capacitance electrolytic capacitor 1' is generally added to the bus behind the rectifier bridge to absorb the surge voltage, and in order to prevent the voltage ripple and current ripple of the small-capacitance electrolytic capacitor from exceeding the standard when the controller is working, a diode 2' is connected in series at one end of the small-capacitance electrolytic capacitor 1' to prevent the small-capacitance electrolytic capacitor 1' from discharging, thereby protecting the small-capacitance electrolytic capacitor 1'. However, in order to avoid the instantaneous current on the circuit being too large to damage the small-capacitance electrolytic capacitor 1', a soft start circuit is usually added to the input end, which makes the structure of the motor control circuit complex and is not conducive to assembly. Figure 1 In addition, the voltage stabilizing element in the existing protection circuit is usually connected with the working circuit at all times, and when the power is large, the voltage stabilizing element cannot be disconnected in time, so that the voltage stabilizing element is easily damaged.

[0003] Therefore, it is an urgent problem to be solved to invent a motor control circuit which can solve the problem of surge voltage and also avoid the instantaneous current on the circuit being too large to damage the capacitor.

[0004] SUMMARY

[0005] The present application aims to solve or improve at least one of the above technical problems.

[0006] The first aspect of the present application is to provide a voltage stabilizing circuit.

[0007] The second aspect of the present application is to provide a motor control circuit.

[0008] The third aspect of the present application is to provide a motor.

[0009] The fourth aspect of the present application is to provide an electrical appliance.

[0010] The technical solution of the first aspect of the present application provides a voltage stabilizing circuit for stabilizing a working circuit, which comprises: an energy processing unit connected in parallel with the working circuit and capable of stabilizing the working circuit; a switching unit connected between the working circuit and the energy processing unit and used for controlling the on-off between the energy processing unit and the working circuit; and a control unit connected with the switching unit and used for controlling the state of the switching unit according to the output power of the working circuit, so as to make the energy processing unit access or disconnect from the working circuit.

[0011] ​The application provides a voltage stabilizing circuit for stabilizing a working circuit. The voltage stabilizing circuit comprises an energy processing unit, a switching unit and a control unit. The energy processing unit is connected in parallel with the working circuit and can stabilize the working circuit. For example, the energy processing unit can be a voltage stabilizing element such as a capacitor. When the voltage of the working circuit is insufficient, the energy processing unit can supply power to the working circuit. When the voltage of the working circuit is too high, the energy processing unit can absorb the energy of the working circuit to reduce the voltage of the working circuit. The switching unit is connected between the working circuit and the energy processing unit and is used to control the on-off of the energy processing unit and the working circuit. The control unit is connected with the switching unit and is used to control the state of the switching unit according to the output power of the working circuit, so that the energy processing unit is connected to the working circuit or disconnected from the working circuit. According to the application, the state of the switching unit is controlled according to the output power of the working circuit, that is, whether the energy processing unit is connected to the working circuit is controlled according to the output power of the working circuit. When the circuit power is large, the energy processing unit can be disconnected from the working circuit, so that the ripple current or the ripple voltage of the voltage stabilizing element on the energy processing unit does not exceed the use condition and is damaged. When the circuit power is small, the energy processing unit can be connected to the working circuit, so that the voltage stabilizing effect is achieved. In addition, according to the application, the state of the switching unit is controlled according to the output power of the working circuit, so that the energy processing unit is connected to the working circuit or disconnected from the working circuit. Therefore, when the power of the working circuit is large, the energy processing unit is not connected, so that the ripple voltage and the ripple current of the voltage stabilizing element do not exceed the use condition and are damaged.

[0012] In the technical solution, the control unit is configured to control the switching unit to be in the first state when the output power is less than the first power threshold, so that the energy processing unit is connected to the working circuit. The control unit is configured to control the switching unit to be in the second state when the output power is greater than or equal to the first power threshold, so that the energy processing unit is disconnected from the working circuit.

[0013] In the technical solution, when the output power of the working circuit is less than the first power threshold, it indicates that the power of the working circuit is small, which meets the application range of the voltage stabilizing element on the energy processing circuit. At this time, the control unit can control the switching circuit to be in the first state, that is, the switch on the switching circuit is closed. At this time, the energy processing circuit can be connected to the working circuit to stabilize the working circuit. When the output power of the working circuit is greater than or equal to the first power threshold, it indicates that the power of the working circuit is large, which does not meet the application range of the voltage stabilizing element on the energy processing circuit. At this time, the control unit can control the switching circuit to be in the second state, that is, the switch on the switching circuit is opened. At this time, the energy processing circuit can be disconnected from the working circuit, so that the problem that the voltage stabilizing element on the energy processing circuit is damaged when working out of the application range is solved, and the service life of the voltage stabilizing element is improved.

[0014] In the technical solution, the voltage stabilizing circuit further comprises a detection unit connected in parallel with the working circuit and configured to detect the voltage of the working circuit; and the control unit is further connected with the detection unit and configured to control the switch unit to be in the first state when the voltage detected by the detection unit is greater than or equal to the reference voltage, so as to enable the energy processing unit to access the working circuit, and control the switch unit to be in the second state when the voltage detected by the detection unit is less than the reference voltage, so as to disconnect the energy processing unit from the working circuit.

[0015] In the technical solution, the voltage stabilizing circuit further comprises a detection unit connected in parallel with the working circuit and configured to detect the voltage of the working circuit; and the control unit is further connected with the detection unit and configured to control the switch unit to be in the first state when the voltage detected by the detection unit is greater than or equal to the reference voltage, so as to enable the energy processing unit to access the working circuit, and control the switch unit to be in the second state when the voltage detected by the detection unit is less than the reference voltage, so as to disconnect the energy processing unit from the working circuit.

[0016] In the technical solution, the energy processing unit comprises a first capacitor connected in parallel with the working circuit and a first diode connected in series with the first capacitor, wherein the current direction of the first diode flows to the negative pole of the working circuit.

[0017] In the technical solution, the energy processing unit comprises a first capacitor connected in parallel with the working circuit and a first diode connected in series with the first capacitor, wherein the current direction of the first diode flows to the negative pole of the working circuit. By arranging the first capacitor and the first diode in the energy processing unit, the first capacitor and the first diode can be charged and discharged when the working circuit is normally working, so as to ensure the voltage stabilizing effect. Specifically, when the alternating voltage is higher than the total voltage of the first capacitor (two capacitors connected in series), the alternating power charges the first capacitor; and when the bus voltage is lower than half of the total voltage of the first capacitor, the first capacitor discharges the bus to maintain the bus voltage, so as to ensure the smooth output of the motor torque.

[0018] In the technical solution, the first capacitor comprises a single capacitor or a capacitor group formed by a plurality of capacitors connected in series or in parallel.

[0019] In the technical solution, the first capacitor can be a single capacitor with large capacity, so as to reduce the number of capacitors. Of course, the first capacitor can also be a capacitor group formed by a plurality of capacitors with small capacity connected in series or in parallel, so as to reduce the cost.

[0020] In the technical solution, the first capacitor comprises a first capacitor A and a first capacitor B, the first diode is connected in series between the first capacitor A and the first capacitor B, the energy processing circuit further comprises: a second diode, a positive electrode of the second diode is connected to a negative electrode of the working circuit, a negative electrode of the second diode is connected to a first end of the first capacitor A, and a second end of the first capacitor A is connected to a positive electrode of the working circuit; a fourth diode, a positive electrode of the fourth diode is connected to a first end of the first capacitor B, a negative electrode of the fourth diode is connected to a positive electrode of the working circuit, and a second end of the first capacitor B is connected to a negative electrode of the working circuit.

[0021] In the technical solution, the first capacitor comprises a first capacitor A and a first capacitor B, the first diode is connected in series between the first capacitor A and the first capacitor B, the energy processing circuit further comprises: a second diode, a positive electrode of the second diode is connected to a negative electrode of the working circuit, a negative electrode of the second diode is connected to a first end of the first capacitor A, and a second end of the first capacitor A is connected to a positive electrode of the working circuit; a fourth diode, a positive electrode of the fourth diode is connected to a first end of the first capacitor B, a negative electrode of the fourth diode is connected to a positive electrode of the working circuit, and a second end of the first capacitor B is connected to a negative electrode of the working circuit.

[0022] It can be understood that when the bus voltage is large, the switch unit is closed, and the first capacitor A and the first capacitor B are charged in series, so as to absorb the surge voltage. When the bus voltage is too small, the switch unit is opened, and the first capacitor A and the first capacitor B are discharged in parallel, so as to maintain the minimum value of the bus voltage and ensure the minimum threshold voltage required by the motor. Specifically, when the alternating voltage is higher than the voltage of the first capacitor A and the first capacitor B in series, the alternating power charges the first capacitor A and the first capacitor B. When the bus voltage is lower than the voltage of a single first capacitor (the first capacitor A or the first capacitor B), the capacitor discharges to supply power to the bus voltage, maintains the bus voltage value, and ensures the smooth output of the motor torque. For example, for the circuit of the motor, when the motor runs at low speed and high overload, the enable net side current harmonic suppression circuit (the circuit of the application) works, the first capacitor A and the first capacitor B are charged in series and discharged in parallel, control the phase of the net side current, and ensure that the bus voltage is higher than the minimum voltage threshold required by the motor for high overload operation, thereby reducing the net side current harmonic; when the motor runs at high speed and high power, the net side current harmonic suppression circuit is disconnected, and the net side current harmonic is indirectly controlled by controlling the instantaneous output power of the motor. The present scheme does not need to add a large inductance reactor or a PFC control circuit in the alternating current input end of the driver, and the net side current harmonic of the motor in all working conditions meets the IEC61000-3-2 standard, while the low-speed load performance is also considered. Further, in order to reduce the phase difference between voltage and current and achieve power factor correction, the prior art generally adds an inductor in the circuit. The present application charges the two capacitors in series and discharges them in parallel, which not only stabilizes the voltage, but also has the function of power factor correction without adding an inductor in the circuit. Specifically, the power factor is highest when the alternating voltage and current are in phase. Therefore, in order to improve the power factor, it is hoped that the current is large when the alternating voltage is high, and the current is small when the alternating voltage is low. Through the circuit of the present application, when the alternating voltage is higher than the voltage of the first capacitor A + the voltage of the first capacitor B, the alternating current = the charging current of the two first capacitors + the inverter current; when the alternating voltage is lower than the voltage of the first capacitor A + the voltage of the first capacitor B, and higher than the voltage of the first capacitor A or the first capacitor B, the alternating current = the inverter current; when the alternating voltage is lower than the voltage of the first capacitor A or the first capacitor B, the alternating current = 0. Therefore, the current is large when the alternating voltage is high, and the current is small when the alternating voltage is low, so as to ensure the power factor and achieve power factor correction.

[0023] In the above technical solution, the switch unit includes a switch and a third diode connected in parallel with each other, the switch is connected with the control unit and can be closed or opened under the action of the control unit, so as to enable the energy processing unit to be connected to or disconnected from the working circuit; the positive electrode of the third diode is connected with the negative end of the working circuit, and the negative electrode of the third diode is connected with the second end of the first capacitor B.

[0024] In the technical scheme, the switch circuit comprises a switch and a third diode connected in parallel with each other, the switch is connected with the control unit and can be closed or opened under the action of the control unit to enable the energy processing circuit to be connected into or disconnected from the working circuit, the anode of the third diode is connected with the negative terminal of the working circuit, and the cathode of the third diode is connected with the second terminal of the first capacitor B. In the application, the third diode and the switch jointly form the switch circuit, under the condition that the working circuit normally works, the first capacitor B can be charged, when the circuit voltage is low, the third diode can form a loop with the first capacitor B, the fourth diode and the working circuit, at this time, the first capacitor B can be discharged to maintain voltage stability.

[0025] In the above technical scheme, the first capacitor comprises an electrolytic capacitor.

[0026] In the technical scheme, the first capacitor comprises an electrolytic capacitor, compared with a thin film capacitor, the cost can be reduced.

[0027] In the above technical scheme, the first capacitor comprises a capacitor group formed by a plurality of capacitors connected in series or in parallel, and the energy processing unit further comprises a plurality of first resistors, the number of the first capacitors is the same as that of the first resistors, and the first resistors are connected in parallel with the corresponding first capacitors.

[0028] In the technical scheme, the first capacitor comprises a capacitor group formed by a plurality of capacitors connected in series or in parallel, and the energy processing unit further comprises a plurality of first resistors, the number of the first capacitors is the same as that of the first resistors, and the first resistors are connected in parallel with the corresponding first capacitors. By connecting a first resistor in parallel with each capacitor, the capacity of each capacitor that can be stored in the charging process can be determined according to the resistance value of each resistor, that is, a resistor with a larger resistance value can be connected in parallel with a capacitor with a larger capacity, and a resistor with a smaller resistance value can be connected in parallel with a capacitor with a smaller capacity, so that each capacitor can work within its standard use range, and the life of each capacitor is improved.

[0029] In the above technical scheme, the resistance values of the plurality of first resistors are equal.

[0030] In the technical scheme, the resistance values of the plurality of first resistors are equal, so that the voltages across each capacitor are equal, which can ensure the service life of each capacitor of the same specification and avoid excessive voltage across a certain capacitor, thereby prolonging the service life of the capacitor.

[0031] In the above technical scheme, the first diode comprises a single diode or a diode group formed by a plurality of diodes connected in series.

[0032] In the technical solution, the first diode can be a single diode, so that the problem of difficult assembly caused by too many diodes can be avoided.

[0033] In the technical solution, the detection unit comprises a comparator, one input end of the comparator is connected with the detection circuit, and the other input end of the comparator can collect or acquire a reference voltage; the control unit is connected with the output end of the comparator and the switching unit, and can control the state of the switching unit according to the comparison result of the comparator.

[0034] In the technical solution, the detection unit comprises a comparator, one input end of the comparator is connected with the detection circuit, and the other input end of the comparator can collect or acquire a reference voltage; the control unit is connected with the output end of the comparator and the switching unit, and can control the state of the switching unit according to the comparison result of the comparator.

[0035] In the technical solution, the detection unit comprises a comparator, one input end of the comparator is connected with the detection circuit, and the other input end of the comparator can collect or acquire a reference voltage; the control unit is connected with the output end of the comparator and the switching unit, and can control the state of the switching unit according to the comparison result of the comparator.

[0036] In the technical solution, the detection unit comprises a comparator, one input end of the comparator is connected with the detection circuit, and the other input end of the comparator can collect or acquire a reference voltage; the control unit is connected with the output end of the comparator and the switching unit, and can control the state of the switching unit according to the comparison result of the comparator.

[0037] In the technical solution, the detection unit comprises a comparator, one input end of the comparator is connected with the detection circuit, and the other input end of the comparator can collect or acquire a reference voltage; the control unit is connected with the output end of the comparator and the switching unit, and can control the state of the switching unit according to the comparison result of the comparator.

[0038] In the technical solution, the detection unit comprises a second resistor, a voltage detection device, the second resistor is connected in parallel with the working circuit, the voltage detection device is connected with the second resistor and is used for detecting the voltage of the second resistor, and the detected voltage of the second resistor is the voltage of the working circuit. The application detects the voltage of the working circuit by connecting a resistor in parallel with the working circuit, compared with the way of measuring the voltage of the working circuit by multiple resistors, the wiring problem is solved, and the structure is not complex due to too many resistors.

[0039] In another technical solution, the number of the second resistors is multiple, each second resistor is connected in series, the multiple second resistors connected in series are connected in parallel with the working circuit, the voltage detection device is connected with the multiple second resistors and is used for detecting the voltage of one second resistor or the total voltage of the multiple second resistors, and the detection unit further comprises a processing unit connected with the voltage detection device and capable of calculating the voltage of the working circuit according to the voltage of the detected one second resistor or the total voltage of the multiple second resistors.

[0040] In the technical solution, the number of the second resistors is multiple, each second resistor is connected in series, the multiple second resistors connected in series are connected in parallel with the working circuit, the voltage detection device is capable of detecting the voltage of one second resistor or the total voltage of the multiple second resistors, and the detection unit further comprises a processing unit capable of calculating the voltage of the working circuit according to the voltage of the detected one second resistor or the total voltage of the multiple second resistors, that is, according to the principle of resistor voltage division, when the voltage of one second resistor or the total voltage of the multiple second resistors is obtained, the voltage of the working circuit can be calculated according to the resistance relationship among the multiple resistors. By detecting the voltage of the working circuit by resistor voltage division, the problem that the voltage detection device cannot detect the voltage when the surge voltage is too large and only one second resistor is arranged is solved.

[0041] In the above technical solution, the voltage stabilizing circuit further comprises a second capacitor connected in parallel with the working circuit.

[0042] In the technical solution, the voltage stabilizing circuit further comprises a second capacitor connected in parallel with the working circuit, and the second capacitor always keeps in a connected state, so that the switching noise at the opening and closing moment of the working circuit can be avoided, the switching noise is avoided by the second capacitor, and the surge voltage is avoided by the first capacitor.

[0043] In the above technical solution, the second capacitor comprises a film capacitor.

[0044] In the technical solution, the second capacitor comprises a film capacitor, so that the second capacitor has a large capacitance value and can normally work under different powers of the working circuit, and the safety of the circuit is ensured.

[0045] The second aspect of the present application provides a motor control circuit, comprising: a working circuit, the working circuit comprising a working circuit; the voltage stabilizing circuit of any one of the first aspect of the present application. Since the motor control circuit provided by the present application comprises the voltage stabilizing circuit of any one of the first aspect of the present application, the motor control circuit provided by the present application comprises all the beneficial effects of the voltage stabilizing circuit of any one of the first aspect of the present application, which will not be repeated here.

[0046] The third aspect of the present application provides a motor, comprising: the motor control circuit of the second aspect of the present application. Since the motor provided by the present application comprises the motor control circuit of the second aspect of the present application, the motor provided by the present application comprises all the beneficial effects of the motor control circuit of the second aspect of the present application, which will not be repeated here.

[0047] The fourth aspect of the present application provides an electrical appliance, comprising: the motor control circuit of the second aspect of the present application; or the motor of the third aspect of the present application. Since the electrical appliance provided by the present application comprises the motor control circuit of the second aspect of the present application, or comprises the motor of the third aspect of the present application, the motor provided by the present application comprises all the beneficial effects of the motor control circuit of the second aspect of the present application, or comprises all the beneficial effects of the motor of the third aspect of the present application, which will not be repeated here.

[0048] Additional aspects and advantages of the present application will become apparent from the following description with reference to specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0049] The above and additional aspects and advantages of embodiments according to the present application will become apparent and more readily appreciated from the following description, with reference to the following figures, wherein:

[0050] Figure 1 A structural schematic diagram of a motor control circuit in the background art is shown.

[0051] Wherein, Figure 1 The correspondence between the names of the components in and the reference signs is as follows:

[0052] 1' small value electrolytic capacitor, 2' diode.

[0053] Figure 2 A structural schematic diagram of the voltage stabilizing circuit provided by the embodiments of the present application is shown.

[0054] Wherein, Figure 2 The correspondence between the names of the components in and the reference signs is as follows:

[0055] 1 Energy processing unit, 11 First capacitor, 12 First diode, 13 First resistor, 14 Second diode, 15 Fourth diode, 2 Switching unit, 21 Switching logic processing unit, 22 Drive device, 23 Switch, 24 Third diode, 3 Detection unit, 31 Second resistor, 32 Processing unit, 4 Second capacitor, 5 Power supply, 6 Motor, 7 Inverter. Detailed Implementation

[0056] To better understand the above aspects, features, and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0057] Many specific details are set forth in the following description in order to provide a full understanding of the embodiments of the present invention. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the embodiments of the present invention is not limited to the specific embodiments disclosed below.

[0058] Example 1

[0059] like Figure 2 As shown, an embodiment of the first aspect of the present invention provides a voltage regulator circuit for stabilizing a working circuit. The voltage regulator circuit includes: an energy processing unit 1 connected in parallel with the working circuit and capable of regulating the voltage of the working circuit; a switching unit 2 connected between the working circuit and the energy processing unit 1 and used to control the connection and disconnection between the energy processing unit 1 and the working circuit; and a control unit connected to the switching unit 2 and used to control the state of the switching unit 2 according to the output power of the working circuit, so that the energy processing unit 1 is connected to or disconnected from the working circuit.

[0060] The voltage stabilizing circuit is used for stabilizing a working circuit, and comprises an energy processing unit 1, a switching unit 2 and a control unit. The energy processing unit 1 is connected in parallel with the working circuit and can stabilize the working circuit. For example, the energy processing unit 1 can be a voltage stabilizing element such as a capacitor. When the voltage of the working circuit is insufficient, the energy processing unit 1 can supply power to the working circuit. When the voltage of the working circuit is too large, the energy processing unit 1 can absorb the energy of the working circuit to reduce the voltage of the working circuit. The switching unit 2 is connected between the working circuit and the energy processing unit 1 and is used for controlling the on-off between the energy processing unit 1 and the working circuit. The control unit is connected with the switching unit 2 and is used for controlling the state of the switching unit 2 according to the output power of the working circuit, so that the energy processing unit 1 is connected to or disconnected from the working circuit. According to the output power of the working circuit, the state of the switching unit 2 is controlled, that is, whether the energy processing unit 1 is connected to the working circuit is controlled. When the circuit power is large, the energy processing unit 1 can be disconnected from the working circuit, so that the ripple current or the ripple voltage of the voltage stabilizing element on the energy processing unit 1 does not exceed the use condition and is damaged. When the circuit power is small, the energy processing unit 1 can be connected to the working circuit, so that the voltage stabilizing effect is achieved. In addition, according to the output power of the working circuit, the state of the switching unit 2 is controlled, so that the energy processing unit 1 is connected to or disconnected from the working circuit. Therefore, when the power of the working circuit is large, the energy processing unit 1 is not connected, so that the ripple voltage and the ripple current of the voltage stabilizing element do not exceed the use condition and are damaged.

[0061] In the above embodiment, when the output power of the working circuit is less than the first power threshold, it indicates that the power of the working circuit is small, which meets the application range of the voltage stabilizing element on the energy processing circuit. At this time, the control unit can control the switching unit 23 to be in the first state, that is, the switch 23 on the switching unit 23 is closed. At this time, the energy processing circuit can be connected to the working circuit to stabilize the working circuit. When the output power of the working circuit is greater than or equal to the first power threshold, it indicates that the power of the working circuit is large, which does not meet the application range of the voltage stabilizing element on the energy processing circuit. At this time, the control unit can control the switching unit 23 to be in the second state, that is, the switch 23 on the switching unit 23 is opened. At this time, the energy processing circuit can be disconnected from the working circuit, so that the problem that the voltage stabilizing element on the energy processing circuit is damaged when working out of the application range is solved, and the service life of the voltage stabilizing element is improved.

[0062] In the above embodiment, the voltage stabilizing circuit further comprises a detection unit 3 connected in parallel with the working circuit, for detecting the voltage of the working circuit; the control unit is further connected with the detection unit 3, for controlling the state of the switch unit 2 according to the voltage detected by the detection unit 3; specifically, when the voltage detected by the detection unit 3 is greater than or equal to the reference voltage, it indicates that there is a surge voltage in the power supply circuit, at this time, the control unit can control the switch 23 circuit to be in the first state, that is, the switch 23 on the switch 23 circuit is closed, at this time, the energy processing circuit can be connected to the working circuit, and the surge voltage can be absorbed in time, so as to stabilize the voltage of the working circuit and avoid damaging the working device on the working circuit. When the voltage detected by the detection unit 3 is less than the reference voltage, the control switch unit 2 is in the second state, so that the energy processing unit 1 is disconnected from the working circuit.

[0063] In the above embodiment, the energy processing unit 1 comprises a first capacitor 11 and a first diode 12, the first capacitor 11 is connected in parallel with the working circuit, and the first diode 12 is connected in series with the first capacitor 11, and the current direction of the first diode 12 flows to the negative electrode of the working circuit. By arranging the first capacitor 11 and the first diode 12 on the energy processing unit 1, the energy processing unit 1 can be charged when the working circuit is normally working, so as to ensure the voltage stabilizing effect. When the alternating voltage of the working circuit is greater than the first capacitor 11, the first capacitor A and the first capacitor B are included, and the first diode 12 is connected in series between the first capacitor A and the first capacitor B, so that the first capacitor A, the first capacitor B and the first diode 12 constitute a charging circuit, that is, when the voltage in the working circuit is relatively high, the charge can be stored on the first capacitor A and the first capacitor B. The energy processing circuit further comprises a second diode 14 and a fourth diode 15, the positive electrode of the second diode 14 is connected with the negative electrode of the working circuit, the negative electrode of the second diode 14 is connected with the first end of the first capacitor A, and the second end of the first capacitor A is connected with the positive electrode of the working circuit; thus, the second diode 14 and the first capacitor A constitute a discharging circuit, when the voltage in the working circuit is relatively low, the first capacitor A can discharge to the working circuit, so as to maintain the voltage of the working circuit. Similarly, the positive electrode of the fourth diode 15 is connected with the first end of the first capacitor B, the negative electrode of the fourth diode 15 is connected with the positive electrode of the working circuit, and the second end of the first capacitor B is connected with the negative electrode of the working circuit. Thus, the fourth diode 15 and the first capacitor B constitute a discharging circuit, when the voltage in the working circuit is relatively low, the first capacitor B can discharge to the working circuit, so as to maintain the voltage of the working circuit.

[0064] In the above embodiment, the switch 23 circuit includes the switch 23 and the third diode 24 connected in parallel with each other, the switch 23 is connected with the control unit and can be closed or opened under the action of the control unit to enable the energy processing circuit to access or disconnect from the working circuit, the positive pole of the third diode 24 is connected with the negative end of the working circuit, and the negative pole of the third diode 24 is connected with the second end of the first capacitor B. In the present application, the third diode 24 and the switch 23 jointly constitute the switch 23 circuit, under the normal working condition of the working circuit, the first capacitor B can be charged, when the circuit voltage is low, the third diode 24 can form a loop with the first capacitor B, the fourth diode 15 and the working circuit, at this time, the first capacitor B can be discharged to maintain voltage stability.

[0065] In the above embodiment, the first capacitor 11 includes an electrolytic capacitor, which can reduce the cost compared with a thin film capacitor.

[0066] In the above embodiment, the first capacitor 11 includes a capacitor group composed of a plurality of capacitors connected in series or in parallel, and the energy processing unit 1 further includes a plurality of first resistors 13, the number of the first capacitors 11 is the same as the number of the first resistors 13, and the first resistors 13 are connected in parallel with the corresponding first capacitors 11. By connecting a first resistor 13 in parallel with each capacitor, the capacity of each capacitor that can be stored during charging can be determined according to the resistance value of each resistor, that is, a resistor with a larger resistance value can be connected in parallel with a capacitor with a larger capacity, and a resistor with a smaller resistance value can be connected in parallel with a capacitor with a smaller capacity, so that each capacitor can work within its standard usage range and the life of each capacitor can be improved.

[0067] In the above embodiment, the resistance values of the plurality of first resistors 13 are equal, so that the voltages across each capacitor are equal, which can ensure the service life of each capacitor of the same specification and avoid the problem of excessive voltage across a certain capacitor, resulting in low service life.

[0068] In the above embodiment, the first diode 12 can be a single diode, which can avoid the problem of difficult assembly due to a large number of diodes. Of course, according to the needs, the first diode 12 can also be a diode group composed of a plurality of diodes connected in series.

[0069] In the above embodiment, the detection unit 3 comprises a comparator and a control unit, one input end of the comparator is connected with the detection circuit, the other input end of the comparator can collect or acquire a reference voltage, the comparator can compare the voltage of the working circuit with the reference voltage, and then judge whether there is a surge voltage in the working circuit. The control unit is connected with the output end of the comparator and the switching unit 2, and is used for controlling the state of the switching unit 2 according to one or more input signals, the one or more input signals including the comparison result signal input by the comparator, so that the state of the switching unit 2 can be controlled according to the output result of the comparator, so that the energy absorption unit is connected to or disconnected from the working circuit.

[0070] In the above technical solution, when any input signal indicates that the switching unit 2 is in the first state, the control device controls the switching unit 2 to be in the first state, so that the energy processing unit 1 is connected to the working circuit.

[0071] In the above embodiment, when any input signal indicates that the switching unit 2 is in the first state, the control device can control the switching unit 2 to be in the first state, so that the energy processing unit 1 is connected to the working circuit.

[0072] In the above embodiment, the detection unit 3 comprises a second resistor 31, a voltage detection device and a current detection device, the second resistor 31 is connected in parallel with the working circuit, the voltage detection device is connected with the second resistor 31, and is used for detecting the voltage of the second resistor 31, the detected voltage of the second resistor 31 is the voltage of the working circuit, and the current detection device is connected in series in the working circuit, and can detect the current of the working circuit, and then the power of the working circuit can be calculated through the product of the voltage of the working circuit and the current of the working circuit. Compared with the way of measuring the voltage of the working circuit by multiple resistance voltage division, the application solves the problem of wiring and avoids the complex structure caused by too many resistors.

[0073] In the above embodiment, the number of the second resistors 31 is multiple, each second resistor 31 is connected in series, and the multiple second resistors 31 connected in series are connected in parallel with the working circuit; the voltage detection device can detect the voltage of one second resistor 31 or the total voltage of the multiple second resistors 31; the detection unit 3 further comprises a processing unit 32, which can calculate the voltage of the working circuit according to the voltage of one second resistor 31 or the total voltage of the multiple second resistors 31, that is, according to the principle of resistance voltage division, when the voltage of one second resistor 31 or the total voltage of the multiple second resistors 31 is acquired, the voltage of the working circuit can be calculated according to the resistance value relationship between the multiple resistors. By the way of resistance voltage division for detecting the voltage of the working circuit, the problem that the voltage detection device cannot detect the voltage if only one second resistor 31 is arranged is solved.

[0074] It is worth mentioning that, in actual use, not only limited to according to the voltage and current of the working circuit to control the opening and closing of the switch unit, but also can be controlled by the comparator to open and close the switch unit, specifically, when the voltage detection device detects a voltage of a second resistor, the voltage can be compared with the comparison voltage through the comparator, when the voltage is greater than the comparison voltage, it can be indirectly concluded that the voltage of the working circuit is greater than the reference voltage at this time, at this time, the control switch unit is in the first state, so that the energy processing unit is connected to the working circuit, and then absorbs the surge voltage.

[0075] In the above embodiment, the voltage stabilizing circuit further comprises a second capacitor in parallel with the working circuit, the second capacitor always keeps in a connected state, which can avoid the switching noise of the working circuit at the moment of switching on and off, thus avoiding the switching noise through the second capacitor and avoiding the surge voltage through the first capacitor.

[0076] In the above embodiment, the second capacitor comprises a thin film capacitor, which can make the second capacitor have a larger capacitance, and can work normally under different powers of the working circuit, ensuring the safety of the circuit.

[0077] Embodiment two

[0078] The voltage stabilizing circuit provided in this embodiment includes all the structures of the voltage stabilizing circuit provided in embodiment one, and further comprises a second capacitor 4 for absorbing the switching noise of the working elements of the working circuit at the moment of switching on and off.

[0079] Specifically, the voltage stabilizing circuit further comprises a second capacitor 4 in parallel with the working circuit, the second capacitor 4 always keeps in a connected state, which can avoid the switching noise of the working circuit at the moment of switching on and off, thus avoiding the switching noise through the second capacitor 4 and avoiding the surge voltage through the first capacitor 11. Further, the second capacitor 4 comprises a thin film capacitor, which can make the second capacitor 4 have a larger capacitance, and can work normally under different powers of the working circuit, ensuring the safety of the circuit.

[0080] The voltage stabilizing circuit can control the state of the switch unit 2 according to the voltage and current of the working circuit, that is, control whether the energy processing unit 1 is connected into the working circuit according to the voltage and current of the working circuit. In this way, the energy processing unit 1 is connected into or disconnected from the working circuit through two aspects. On the one hand, the energy processing unit 1 is connected according to the voltage of the working circuit, that is, when the voltage in the working circuit is too large, there may be a surge voltage. At this time, the energy processing unit 1 is controlled to be connected to effectively absorb the surge voltage and avoid damaging the working device in the working circuit. On the other hand, the energy processing unit 1 is connected into or disconnected from the working circuit according to the power of the working circuit. In this way, when the circuit power is large, the energy processing unit 1 is controlled to be disconnected from the working circuit, so as to avoid that the ripple current or ripple voltage of the voltage stabilizing element on the energy processing unit 1 is too large and exceeds the use condition and is damaged. When the circuit power is small, the energy processing unit 1 is controlled to be connected into the working circuit to realize the effect of voltage stabilization.

[0081] In the above embodiment, when the voltage in the working circuit is less than the reference voltage, and the product of the voltage in the working circuit and the current in the working circuit is less than the first power threshold, it is indicated that there is no surge voltage in the working circuit, and at the same time, the power in the working circuit meets the application range of the voltage stabilizing element on the energy processing unit 1. At this time, the control unit can control the switch unit 2 to be in the first state, that is, the switch on the switch unit 2 is closed. At this time, the energy processing unit 1 can be connected into the working circuit to stabilize the voltage of the working circuit.

[0082] In the above embodiment, when the voltage in the working circuit is less than the reference voltage, and the product of the voltage in the working circuit and the current in the working circuit is greater than or equal to the first power threshold, it is indicated that there is no surge voltage in the working circuit, but at this time, the power in the working circuit is large and does not meet the application range of the voltage stabilizing element on the energy processing unit 1. At this time, the control unit can control the switch unit 2 to be in the second state, that is, the switch on the switch unit 2 is opened. At this time, the energy processing unit 1 can be disconnected from the working circuit, solving the problem that the voltage stabilizing element on the energy processing unit 1 works outside the application range and is damaged, and improving the service life of the voltage stabilizing element.

[0083] In the above embodiment, when the voltage in the working circuit is greater than the reference voltage, it is indicated that there is a surge voltage in the working circuit. At this time, the control unit can control the switch unit 2 to be in the first state, that is, the switch on the switch unit 2 is closed. At this time, the energy processing unit 1 can be connected into the working circuit to timely absorb the surge voltage, stabilize the voltage of the working circuit, and avoid damaging the working device on the working circuit.

[0084] In the above embodiment, the energy processing unit 1 comprises the first capacitor 11 and the first diode 12, the first capacitor 11 is connected in parallel with the working circuit, the first diode 12 is connected in series with the first capacitor 11, and the current direction of the first diode 12 flows to the negative pole of the working circuit. By arranging the first capacitor 11 and the first diode 12 on the energy processing unit 1, the energy processing unit 1 can be charged when the working circuit is normally working, thereby ensuring the effect of voltage stabilization.

[0085] In the above embodiment, the first capacitor 11 can be a single capacitor with large capacity, thereby reducing the number of capacitors. Of course, the first capacitor 11 can also be a capacitor group composed of multiple capacitors with small capacity connected in series or connected in parallel, thereby reducing the cost.

[0086] In the above embodiment, the first capacitor 11 comprises an electrolytic capacitor, thereby reducing the cost compared with a thin film capacitor.

[0087] In the above embodiment, the first capacitor 11 comprises a capacitor group composed of multiple capacitors connected in series or connected in parallel, and the energy processing unit 1 further comprises multiple first resistors 13, the number of the first capacitors 11 is the same as the number of the first resistors 13, and the first resistors 13 are connected in parallel with the corresponding first capacitors 11. By connecting a first resistor 13 in parallel with each capacitor, the capacity of each capacitor that can be stored during charging can be determined according to the resistance value of each resistor, that is, a resistor with large resistance value can be connected in parallel with a capacitor with large capacity, and a resistor with small resistance value can be connected in parallel with a capacitor with small capacity, thereby ensuring that each capacitor can work within its standard usage range and improving the service life of each capacitor.

[0088] In the above embodiment, the resistance values of the multiple first resistors 13 are equal, thereby making the voltages across each capacitor equal, thereby ensuring the service life of each capacitor with the same specification and avoiding the problem that the voltage across a certain capacitor is too large, thereby reducing the service life.

[0089] In the above embodiment, the first diode 12 can be a single diode, thereby avoiding the problem of difficult assembly due to too many diodes. Of course, according to the need, the first diode 12 can also be a diode group composed of multiple diodes connected in series.

[0090] In the above embodiment, the switch unit 2 includes the switch 23 and the third diode 24 connected in parallel with each other, and the first capacitor can be discharged. Specifically, the third diode 24 is connected in parallel with the switch 23, and the third diode 24 is connected with the first capacitor. In this way, when the working circuit is normally working, the first capacitor 11 can be charged, and when the circuit voltage is low, the third diode 24 and the first capacitor 11 can form a loop with the working circuit, and at this time, the first capacitor 11 can be discharged to maintain the voltage stable.

[0091] In the above embodiment, the detection unit 3 includes the second resistor 31, the voltage detection device, and the current detection device. The second resistor 31 is connected in parallel with the working circuit, the voltage detection device is connected with the second resistor 31, and is used to detect the voltage of the second resistor 31. The voltage detected by the second resistor 31 is the voltage of the working circuit. The current detection device is connected in series in the working circuit, and can detect the current of the working circuit. Then, the power of the working circuit can be calculated by the product of the voltage of the working circuit and the current of the working circuit. In this application, a resistor is connected in parallel with the working circuit to detect the voltage of the working circuit. Compared with the way of measuring the voltage of the working circuit by multiple resistors, the wiring problem is solved, and the structure is avoided to be too complex due to too many resistors.

[0092] In the above embodiment, the number of the second resistors 31 is multiple, each of the second resistors 31 is connected in series, and the multiple second resistors 31 connected in series are connected in parallel with the working circuit. The voltage detection device can detect the voltage of one of the multiple second resistors 31 or the total voltage of the multiple second resistors 31. The detection unit 3 further includes the processing unit 32, which can calculate the voltage of the working circuit according to the voltage of one of the multiple second resistors 31 or the total voltage of the multiple second resistors 31. That is, according to the principle of resistor voltage division, when the voltage of one of the multiple second resistors 31 or the total voltage of the multiple second resistors 31 is obtained, the voltage of the working circuit can be calculated according to the resistance relationship between the multiple resistors. By the way of detecting the voltage of the working circuit by resistor voltage division, the problem that the voltage detection device cannot detect the voltage when the surge voltage is too large is solved if only one second resistor 31 is provided.

[0093] Embodiment Three

[0094] The difference between the voltage stabilizing circuit provided in this embodiment and the voltage stabilizing circuit provided in the first embodiment is that multiple second resistors are used to measure the voltage of the working circuit in this embodiment.

[0095] Specifically, the number of the second resistors 31 is multiple, each of the second resistors 31 is in series, and the multiple second resistors 31 in series is in parallel with the working circuit; the voltage detection device can detect the voltage of one of the multiple second resistors 31 or the total voltage of the multiple second resistors 31; the detection unit 3 further comprises a processing unit 32, which can calculate the voltage of the working circuit according to the voltage of one of the multiple second resistors 31 or the total voltage of the multiple second resistors 31, that is, according to the principle of resistance voltage division, when the voltage of one of the multiple second resistors 31 or the total voltage of the multiple second resistors 31 is obtained, the voltage of the working circuit can be calculated according to the resistance value relationship between the multiple resistors. By the way of resistance voltage division to detect the voltage of the working circuit, the problem that the voltage detection device cannot detect if only one second resistor 31 is set is solved due to the excessive surge voltage.

[0096] The voltage stabilizing circuit provided in the embodiment can control the state of the switching unit 2 according to the voltage and current of the working circuit, that is, control whether the energy processing unit 1 is connected into the working circuit according to the voltage and current of the working circuit, so that the energy processing unit 1 is connected into or disconnected from the working circuit through two aspects, one aspect is to control the energy processing unit 1 to be connected according to the voltage of the working circuit, that is, when the voltage in the working circuit is too large, there may be a surge voltage, at this time, the energy processing unit 1 is controlled to be connected to effectively absorb the surge voltage and avoid damaging the working device in the working circuit. The other aspect is to control the energy processing unit 1 to be connected into or disconnected from the working circuit through the power of the working circuit, so that when the circuit power is large, the energy processing unit 1 is controlled to be disconnected from the working circuit, so that the ripple current or ripple voltage of the voltage stabilizing element on the energy processing unit 1 can be avoided to be too large and damaged when exceeding the use condition, and when the circuit power is small, the energy processing unit 1 is controlled to be connected into the working circuit to achieve the effect of voltage stabilization.

[0097] In the above embodiment, when the voltage in the working circuit is less than the reference voltage, and the product of the voltage in the working circuit and the current in the working circuit is less than the first power threshold, it is indicated that there is no surge voltage in the working circuit, and the power in the working circuit meets the application range of the voltage stabilizing element on the energy processing unit 1, at this time, the control unit can control the switching unit 2 to be in the first state, that is, the switch on the switching unit 2 is closed, at this time, the energy processing unit 1 can be connected into the working circuit to stabilize the voltage of the working circuit.

[0098] In the above embodiment, when the voltage in the working circuit is less than the reference voltage, and the product of the voltage in the working circuit and the current in the working circuit is greater than or equal to the first power threshold, it indicates that there is no surge voltage in the working circuit, but the power in the working circuit is large at this time, which does not conform to the application range of the voltage stabilizing element on the energy processing unit 1, at this time, the control unit can control the switching unit 2 to be in the second state, that is, the switch on the switching unit 2 is turned off, at this time, the energy processing unit 1 can be disconnected from the working circuit, solving the problem that the voltage stabilizing element on the energy processing unit 1 is damaged when working out of the application range, and improving the service life of the voltage stabilizing element.

[0099] In the above embodiment, when the voltage in the working circuit is greater than the reference voltage, it indicates that there is a surge voltage in the working circuit, at this time, the control unit can control the switching unit 2 to be in the first state, that is, the switch on the switching unit 2 is turned on, at this time, the energy processing unit 1 can be connected to the working circuit, and the surge voltage can be absorbed in time, so as to stabilize the voltage of the working circuit and avoid damage to the working device on the working circuit.

[0100] In the above embodiment, the energy processing unit 1 includes a first capacitor 11 and a first diode 12, the first capacitor 11 is connected in parallel with the working circuit, and the first diode 12 is connected in series with the first capacitor 11, and the current direction of the first diode 12 flows to the negative electrode of the working circuit. By arranging the first capacitor 11 and the first diode 12 on the energy processing unit 1, the energy processing unit 1 can be charged when the working circuit is normally working, so as to ensure the voltage stabilization effect.

[0101] In the above embodiment, the first capacitor 11 can be a single capacitor with large capacity, so as to reduce the number of capacitors. Of course, the first capacitor 11 can also be a capacitor group formed by connecting a plurality of capacitors with small capacity in series or connecting a plurality of capacitors with small capacity in parallel, so as to reduce the cost.

[0102] In the above embodiment, the first diode 12 can be a single diode, so as to avoid the problem of difficult assembly caused by too many diodes. Of course, according to the needs, the first diode 12 can also be a diode group formed by connecting a plurality of diodes in series.

[0103] In the above embodiment, the switching unit 2 includes a switch 23 and a third diode 24 connected in parallel with each other, so as to enable the first capacitor to be discharged. Specifically, the third diode 24 is connected in parallel with the switch 23, and the third diode 24 is connected with the first capacitor, so that the first capacitor 11 can be charged under the condition that the working circuit is normally working, when the circuit voltage is low, the third diode 24 and the first capacitor 11 can form a loop with the working circuit, at this time, the first capacitor 11 can be discharged to maintain the voltage stability.

[0104] Embodiment Four

[0105] The difference between the voltage stabilizing circuit provided by the embodiment and the voltage stabilizing circuit provided by the third embodiment is that the voltage stabilizing circuit provided by the embodiment uses a capacitor group composed of a plurality of resistors in series as a voltage stabilizing element.

[0106] Specifically, the first capacitor 11 includes a capacitor group composed of a plurality of capacitors in series or in parallel, and the energy processing unit 1 further includes a plurality of first resistors 13, the number of the first resistors 13 being the same as that of the first capacitors 11, and each first resistor 13 being connected in parallel with a corresponding first capacitor 11. By connecting a first resistor 13 in parallel with each capacitor, the capacity of each capacitor that can be stored during charging can be determined according to the resistance value of each resistor, that is, a resistor with a larger resistance value can be connected in parallel with a capacitor with a larger capacity, and a resistor with a smaller resistance value can be connected in parallel with a capacitor with a smaller capacity, so that each capacitor can work within its standard usage range and the service life of each capacitor is improved.

[0107] The voltage stabilizing circuit provided by the embodiment can control the state of the switch unit 2 according to the voltage and current of the working circuit, that is, control whether the energy processing unit 1 is connected to the working circuit according to the voltage and current of the working circuit. In this way, the energy processing unit 1 can be connected to or disconnected from the working circuit in two ways. On the one hand, the energy processing unit 1 is connected according to the voltage of the working circuit, that is, when the voltage in the working circuit is too large, there may be a surge voltage, and at this time, the energy processing unit 1 is controlled to be connected to effectively absorb the surge voltage and avoid damaging the working devices in the working circuit. On the other hand, the energy processing unit 1 is connected to or disconnected from the working circuit according to the power of the working circuit. In this way, when the power of the circuit is large, the energy processing unit 1 is controlled to be disconnected from the working circuit, so that the ripple current or ripple voltage of the voltage stabilizing element on the energy processing unit 1 does not exceed the use condition and is damaged. When the power of the circuit is small, the energy processing unit 1 is controlled to be connected to the working circuit to achieve the effect of voltage stabilization.

[0108] In the above embodiment, when the voltage in the working circuit is less than the reference voltage, and the product of the voltage in the working circuit and the current in the working circuit is less than the first power threshold, it indicates that there is no surge voltage in the working circuit, and the power in the working circuit meets the applicable range of the voltage stabilizing element on the energy processing unit 1. At this time, the control unit can control the switch unit 2 to be in the first state, that is, the switch on the switch unit 2 is closed, and at this time, the energy processing unit 1 can be connected to the working circuit to stabilize the voltage of the working circuit.

[0109] In the above embodiment, when the voltage in the working circuit is less than the reference voltage, the product of the voltage in the working circuit and the current in the working circuit is greater than or equal to the first power threshold, which indicates that there is no surge voltage in the working circuit. However, the power in the working circuit is large at this time, which does not conform to the application range of the voltage stabilizing element on the energy processing unit 1. At this time, the control unit can control the switching unit 2 to be in the second state, that is, the switch on the switching unit 2 is turned off. At this time, the energy processing unit 1 can be disconnected from the working circuit, thereby solving the problem that the voltage stabilizing element on the energy processing unit 1 is damaged when working out of the application range, and improving the service life of the voltage stabilizing element.

[0110] In the above embodiment, when the voltage in the working circuit is greater than the reference voltage, it indicates that there is a surge voltage in the working circuit. At this time, the control unit can control the switching unit 2 to be in the first state, that is, the switch on the switching unit 2 is turned on. At this time, the energy processing unit 1 can be connected to the working circuit, thereby timely absorbing the surge voltage, stabilizing the voltage of the working circuit, and avoiding damage to the working device on the working circuit.

[0111] In the above embodiment, the resistances of the plurality of first resistors 13 are equal, so that the voltages across each capacitor are equal. Thus, for capacitors of the same specification, the service life of each capacitor can be ensured, and the problem of excessive voltage across a certain capacitor and low service life can be avoided.

[0112] In the above embodiment, the switching unit 2 includes the switch 23 and the third diode 24 connected in parallel with each other, so that the first capacitor can be discharged. Specifically, the third diode 24 is connected in parallel with the switch 23, and the third diode 24 is connected with the first capacitor. Thus, under the normal working condition of the working circuit, the first capacitor 11 can be charged. When the circuit voltage is low, the third diode 24 and the first capacitor 11 can form a loop with the working circuit, so that the first capacitor 11 can be discharged to maintain the voltage stable.

[0113] Embodiment Five

[0114] The embodiment provides a motor 6 control circuit, which comprises a detection unit 3, a comparison trigger unit, a switching logic processing unit 21, a switching unit 2, and an energy processing unit 1. The two input ends of the detection unit 3 are connected to the positive and negative ends of a protected circuit respectively. The output end of the detection unit 3 is connected to the input end of the comparison trigger unit. The output end of the comparison trigger unit and the control signal of an MCU are connected to the two inputs of the switching logic processing unit 21. The output of the switching logic processing unit 21 is connected to the input end of the switching unit 2. The two output ends of the switching unit 2 are respectively connected to one end of a second capacitor 4 in the energy processing unit 1 and the negative end of the protected circuit. The energy processing unit 1 is connected across the positive and negative ends of the protected circuit.

[0115] Further, the detecting unit 3 is realized by resistance voltage division.

[0116] Further, the comparing trigger unit is realized by a comparing circuit, and the reference voltage of the comparing circuit is preset according to the maximum value of the allowed voltage of the protected circuit.

[0117] Further, the comparing circuit of the comparing trigger unit can be a forward comparing circuit or a reverse comparing circuit.

[0118] Further, the switch logic processing unit 21 has two or more input signals, at least one of which is from the main control chip (MCU) and at least one of which is from the comparing trigger unit.

[0119] Further, as long as one of the input signals of the switch logic processing unit 21 is a signal for turning on the switch 23 of the switch unit 2, the switch logic processing unit 21 outputs a signal for turning on the switch 23 of the switch unit 2.

[0120] Further, the switch logic processing unit 21 turns on the switch 23 of the switch unit 2 according to the control signal from the main control chip (MCU) when the output power of the inverter 7 is less than the power threshold value, and turns off the switch 23 of the switch unit 2 according to the control signal from the main control chip (MCU) when the output power of the inverter 7 is greater than the power threshold value.

[0121] Further, the power threshold value of the working circuit is determined by the ripple voltage and ripple current of the two first capacitors 11 in the energy processing unit 1.

[0122] Further, the switch unit 2 comprises a driving device 22, the switch 23, and a third diode 24 connected in parallel with the switch 23.

[0123] Further, the switch 23 is in an off state before the switch logic processing unit 21 outputs a signal for turning on the switch 23, and the switch 23 is in an on state after the switch logic processing unit 21 outputs a signal for turning on the switch 23.

[0124] Further, the anode of the third diode 24 is directly or indirectly connected to the negative terminal of the protected circuit, and the cathode is connected to one end of the first capacitor 11 in the energy processing unit 1.

[0125] Further, the energy processing unit 1 comprises at least two capacitors and at least three diodes, one end of a first capacitor A is connected to the positive terminal of the protected circuit, the other end of the first capacitor A is connected to the cathode of a second diode 14, the anode of the second diode 14 is connected to the negative terminal of the protected circuit; the cathode of a fourth diode 15 is connected to the positive terminal of the protected circuit, the anode of the fourth diode 15 is connected to one end of a first capacitor B, the other end of the first capacitor B is connected to the switch 23 of the switch unit 2.

[0126] Further, the first capacitor A and the first capacitor B in the energy processing unit 1 can be a single capacitor or a capacitor group in series or parallel connection.

[0127] Further, the first diode 12, the second diode 14 and the third diode 24 in the energy processing unit 1 can be a single diode or a diode group in series or parallel connection.

[0128] Further, if the protected circuit is supplied with alternating current, the voltage stabilizing circuit is placed after the rectifying circuit and before the protected device; if the protected circuit is supplied with direct current, the voltage stabilizing circuit is placed after the input end of the power supply 5 and before the protected device.

[0129] The application discloses a motor 6 control circuit, which comprises a detection unit 3, a comparison triggering unit, a switch logic processing unit 21, a switch unit 2, an energy processing unit 1 and the like, and simultaneously has power factor correction and surge voltage absorption functions. If the circuit is used in a motor 6 controller of a drum washing machine, the low-frequency abnormal sound problem caused by a small bus capacitor / without electrolytic capacitor can be solved.

[0130] When the output power of the circuit is small, the MCU controls the switch 23 to be in the on state, at this time, the circuit is in the electrolytic capacitor mode, and simultaneously has the power factor correction and surge voltage absorption functions; when the output power of the circuit is large, the MCU controls the switch 23 to be in the off state, at this time, the circuit is in the small bus capacitor / without electrolytic capacitor mode, and the input power supply 5 power factor is controlled through a control algorithm. When the detected voltage exceeds the set threshold value, the comparison triggering unit outputs a signal to make the switch 23 conduct, and the energy processing unit 1 is connected to the circuit to absorb the surge voltage, so that the controller meets the power factor, current harmonic and surge voltage test standards of IEC or national standards.

[0131] In the embodiment, the detection unit 3 is used to detect the current voltage value and transmit the voltage detection result to the comparison triggering unit. The comparison triggering unit compares the detected voltage value with a reference voltage, and outputs a triggering signal to the switch logic processing unit 21 when the two meet the triggering condition; the switch logic processing unit 21 combines the output signal of the comparison triggering unit and the control signal of the MCU, and outputs a switch 23 control signal to the switch unit 2; the switch unit 2 controls the switch 23 device to be turned on or turned off after receiving the switch 23 control signal, so that the energy processing unit 1 works in different modes, and is used for input power supply 5 power factor correction, motor 6 control circuit, input current harmonic suppression and surge voltage absorption.

[0132] The motor 6 control circuit can be used for input power supply 5 power factor correction and input current harmonic suppression, and can also be used for surge voltage absorption.

[0133] Furthermore, to gain a clearer understanding of the voltage regulator circuit of this application, taking motor 6 as an example, the specific voltage regulation process of the voltage regulator circuit of this application will be described as follows:

[0134] like Figure 2 As shown, the working circuit is composed of power supply 5 and motor 6. The circuit of power supply 5 is the working circuit. The detection unit 3 is composed of three second resistors 31, a voltage detection device (not shown in the figure), and a current detection device (not shown in the figure). The voltage detection device can detect the voltage of the second resistor 31, and then calculate the working circuit voltage through the processing unit 32. The current detection device can detect the current of the working circuit. When the power supply voltage is less than the first voltage threshold and the power of the working circuit is less than the first power threshold, it indicates that there is no surge voltage in the working circuit. At the same time, the power in the working circuit is within the applicable range of the voltage stabilizing element on the energy processing unit 1. At this time, the switch logic processing unit 21 can send a signal to the drive device 22, and the drive device 22 can drive the switch 23 to close. At this time, the energy processing unit 1 (composed of two first capacitors 11 and a first diode 12) can be connected to the working circuit to stabilize the voltage of the working circuit. When the power supply voltage is detected to be lower than the first threshold, but the power of the working circuit is higher than the first power threshold, it indicates that there is no surge voltage in the working circuit. However, the power in the working circuit is relatively high at this time, which does not meet the applicable range of the first capacitor. At this time, the switching logic processing unit 21 can send a signal to the driving device 22, which can drive the switch 23 to open. At this time, the energy processing unit 1 can be disconnected from the working circuit, thereby protecting the first capacitor. When the voltage in the working circuit is higher than the reference voltage, it indicates that there is a surge voltage in the working circuit. At this time, the switching logic processing unit 21 can send a signal to the driving device 22, which can drive the switch 23 to close. At this time, the energy processing unit 1 can be connected to the working circuit to absorb the surge voltage. The second capacitor 4 can absorb the switching noise of the inverter 7.

[0135] Furthermore, if the protected circuit is powered by AC, the voltage regulator circuit of this application is placed after the rectifier circuit and before the protected device; if the protected circuit is powered by DC, the voltage regulator circuit of this application is placed after the power input terminal and before the protected device.

[0136] A second aspect of the present invention provides a motor control circuit, including: a working circuit, the working circuit including a voltage regulator circuit as described in any of the technical solutions of the first aspect of the present application.

[0137] A third aspect of the present invention provides a motor, including a motor control circuit as described in the second aspect of the present application.

[0138] The embodiment of the fourth aspect of the present application provides an electrical appliance, comprising: the motor control circuit according to the technical solution of the second aspect of the present application; or the motor according to the technical solution of the third aspect of the present application.

[0139] In the embodiments according to the present application, the terms "first", "second", "third" are only used for descriptive aspects, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments according to the present application can be understood according to the specific circumstances.

[0140] In addition, although each operation is described in a specific order, it should be understood that the operations are required to be performed in the specific order shown or in a sequential order, or all the illustrated operations should be performed to obtain the desired results. In certain circumstances, multitasking and parallel processing can be advantageous. Similarly, although several implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present application. Certain features described in the context of separate embodiments can also be combined in a single implementation. Conversely, various features described in the context of a single implementation can also be implemented separately or in any suitable subcombination.

[0141] Although the subject matter has been described in language specific to structural features and method logical acts, it is to be understood that the subject defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely illustrative of example forms of implementing the claims.

[0142] The above is only the preferred embodiment according to the embodiments of the present application, and is not used to limit the embodiments of the present application. For those skilled in the art, the embodiments of the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A voltage regulator circuit, characterized in that, For stabilizing the operating circuit, the voltage regulator circuit includes: An energy processing unit, connected in parallel with the working circuit, is capable of regulating the voltage of the working circuit; A switching unit, connected between the working circuit and the energy processing unit, is used to control the connection and disconnection between the energy processing unit and the working circuit; A control unit, connected to the switching unit, is used to control the state of the switching unit according to the output power of the working circuit, so that the energy processing unit is connected to or disconnected from the working circuit; The control unit is used to control the switching unit to be in a first state when the output power is less than a first power threshold, so that the energy processing unit is connected to the working circuit; When the output power is greater than or equal to the first power threshold, the control unit controls the switching unit to be in a second state so that the energy processing unit is disconnected from the working circuit. If the working circuit is powered by AC, the voltage regulator circuit is placed after the rectifier circuit and before the protected device; if the working circuit is powered by DC, the voltage regulator circuit is placed after the power input terminal and before the protected device.

2. The voltage regulator circuit according to claim 1, characterized in that, Also includes: A detection unit, connected in parallel with the working circuit, is used to detect the bus voltage of the working circuit; The control unit is also connected to the detection unit and is used to control the switching unit to a first state when the voltage detected by the detection unit is greater than or equal to the reference voltage, so that the energy processing unit is connected to the working circuit, and to control the switching unit to a second state when the voltage detected by the detection unit is less than the reference voltage, so that the energy processing unit is disconnected from the working circuit.

3. The voltage regulator circuit according to claim 1, characterized in that, The energy processing unit includes: The first capacitor is connected in parallel with the working circuit; The first diode is connected in series with the first capacitor; The current in the first diode flows towards the negative terminal of the working circuit.

4. The voltage regulator circuit according to claim 3, characterized in that, The first capacitor includes a single capacitor or a capacitor bank consisting of multiple capacitors connected in series or in parallel.

5. The voltage regulator circuit according to claim 4, characterized in that, The first capacitor includes a first capacitor A and a first capacitor B, and the first diode is connected in series between the first capacitor A and the first capacitor B. The energy processing unit further includes: The second diode has its anode connected to the cathode of the working circuit, its cathode connected to the first terminal of the first capacitor A, and its second terminal connected to the anode of the working circuit. The fourth diode has its anode connected to the first terminal of the first capacitor B, its cathode connected to the anode of the working circuit, and its second terminal connected to the cathode of the working circuit.

6. The voltage regulator circuit according to claim 5, characterized in that, The switching unit includes a switch and a third diode connected in parallel. The switch is connected to the control unit and can be closed or opened under the action of the control unit to connect the energy processing unit to or disconnect it from the working circuit. The positive terminal of the third diode is connected to the negative terminal of the working circuit, and the negative terminal of the third diode is connected to the second terminal of the first capacitor B.

7. The voltage regulator circuit according to claim 3, characterized in that, The first capacitor includes an electrolytic capacitor.

8. The voltage regulator circuit according to claim 3, characterized in that, The first capacitor comprises a capacitor bank consisting of multiple capacitors connected in series or in parallel, and the energy processing unit further comprises: Multiple first resistors, the number of first capacitors being the same as the number of first resistors, and each first resistor being connected in parallel with its corresponding first capacitor.

9. The voltage regulator circuit according to claim 8, characterized in that, The resistance values ​​of the plurality of first resistors are all equal.

10. The voltage regulator circuit according to claim 3, characterized in that, The first diode includes a single diode or a diode group consisting of multiple diodes connected in series.

11. The voltage regulator circuit according to claim 2, characterized in that, The detection unit includes: A comparator, one input of which is connected to the detection unit, and the other input of which can acquire or obtain the reference voltage; The control unit is connected to the output of the comparator and the switching unit, and can also control the state of the switching unit according to the comparison result of the comparator.

12. The voltage regulator circuit according to claim 11, characterized in that, The control unit can control the state of the switching unit based on one or more input signals, including the comparison result signal input by the comparator and the output power signal of the working circuit; when any of the input signals indicates that the switching unit is in a first state, the control unit can control the switching unit to be in the first state so that the energy processing unit is connected to the working circuit.

13. The voltage regulator circuit according to claim 2, characterized in that, The detection unit includes: The second resistor is connected in parallel with the working circuit. A voltage detection device, connected to the second resistor, is used to detect the voltage across the second resistor.

14. The voltage regulator circuit according to claim 13, characterized in that, There are multiple second resistors, each of which is connected in series, and the multiple second resistors connected in series are connected in parallel with the working circuit; The voltage detection device is connected to the plurality of second resistors and is used to detect the voltage of one of the second resistors or the total voltage of the plurality of second resistors; The detection unit further includes: The processing unit, connected to the voltage detection device, is capable of calculating the voltage of the working circuit based on the detected voltage of one second resistor or the total voltage of multiple second resistors.

15. The voltage regulator circuit according to any one of claims 1 to 10, characterized in that, Also includes: The second capacitor is connected in parallel with the operating circuit.

16. The voltage regulator circuit according to claim 15, characterized in that, The second capacitor includes a film capacitor.

17. A motor control circuit, characterized in that, include: A working circuit, the working circuit comprising a working circuit; The voltage regulator circuit as described in any one of claims 1 to 16.

18. An electric motor, characterized in that, include: The motor control circuit as described in claim 17.

19. An electrical appliance, characterized in that, include: The motor control circuit as described in claim 17; or The motor as described in claim 18.

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