Control circuit, controller, motor and electric equipment

Abstract

The invention provides a control circuit, a controller, a motor and electric equipment. The control circuit comprises a filter circuit which is connected with an AC power supply and a DC bus; the rectifying circuit is connected with the filtering circuit, and the rectifying circuit is used for converting the alternating-current voltage output by the alternating-current power supply into direct-current voltage so as to supply power to a direct-current bus; the rectification circuit comprises a capacitor assembly and a diode assembly, and the connection relation of capacitors in the capacitor assembly is adjusted through the diode assembly so as to reduce the charging voltage of the capacitors. And the inverter circuit is connected with the rectifying circuit and is used for converting the direct-current voltage on the direct-current bus into alternating-current voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular, to a control circuit, a controller, a motor, and an electrical equipment. Background Art

[0002] In the prior art, controllers of motors with small bus capacitors / without electrolytic capacitors have been widely used in household appliances such as air conditioners, water pumps, and washing machines due to their small size, long lifespan, high power factor, and low cost. The controller of a motor generally includes a filtering circuit, a rectifying circuit, and an inverting circuit.

[0003] Among them, the traditional topology of the rectifying circuit is a rectifier bridge plus an electrolytic capacitor. In the rectifying circuit, the withstand voltage value of the electrolytic capacitor must be higher than the highest voltage of the bus. However, the cost of the electrolytic capacitor is affected by its withstand voltage value. Under the condition that parameters such as capacitance value are the same, the higher the withstand voltage value of the capacitor, the higher the cost of the capacitor, which increases the manufacturing cost of the controller of the motor. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] For this reason, a first aspect of the present invention is to propose a control circuit.

[0006] A second aspect of the present invention is to propose a controller.

[0007] A third aspect of the present invention is to propose a motor.

[0008] A fourth aspect of the present invention is to propose an electrical equipment.

[0009] In view of this, according to one aspect of the present invention, a control circuit is proposed. The control circuit includes: a filtering circuit connected to an AC power supply and a DC bus; a rectifying circuit connected to the filtering circuit, where the rectifying circuit is used to convert the AC voltage output by the AC power supply into a DC voltage to supply power to the DC bus; the rectifying circuit includes a capacitor component and a diode component, and the connection relationship of the capacitors in the capacitor component is adjusted through the diode component to reduce the charging voltage of the capacitors; an inverting circuit connected to the rectifying circuit, where the inverting circuit is used to convert the DC voltage on the DC bus into an AC voltage.

[0010] The control circuit provided by the present invention is used to control the operation of a motor to be controlled, and moreover, by controlling the operation of the motor to be controlled through the control circuit provided by the present invention, the charging voltage of the capacitors in the circuit can be reduced, thereby reducing the withstand voltage value of the capacitors and the manufacturing cost of the circuit.

[0011] Specifically, the control circuit provided by the present invention includes a filtering circuit, a rectifying circuit, and an inverting circuit.

[0012] Among them, the filtering circuit is connected to the AC power supply and the DC bus. Further, the rectifying circuit is connected to the filtering circuit and the DC bus. Further, the inverting circuit is connected to the rectifying circuit and the DC bus.

[0013] Among them, the above filtering circuit is used to filter the input signal of the control circuit, thereby reducing the interference signals input into the internal circuit and the overall device to meet the current harmonic requirements of the control circuit, so as to ensure the stable operation of the circuit and the device.

[0014] Further, the above AC power supply is used to provide an AC voltage for the rectifying circuit, so that the rectifying circuit can convert the AC voltage into a DC voltage, thereby supplying power to the DC bus.

[0015] Further, the above DC bus is used to provide a DC voltage for the inverting circuit, so that the inverting circuit can convert the DC voltage into an AC voltage to provide an AC voltage for the motor to be controlled controlled by the control circuit.

[0016] Further, the rectifying circuit includes a rectifier bridge. The input end of the rectifier bridge is connected to the AC power supply through the filtering circuit, and the output end of the rectifier bridge is connected to the above DC bus. Specifically, when the control circuit works, the rectifier bridge can obtain an AC voltage from the AC power supply and can convert the AC voltage into a DC voltage and input it to the above DC bus to supply power to the above DC bus.

[0017] Further, the rectifying circuit further includes a capacitor component and a diode component. The capacitor component includes a plurality of capacitors, and the diode component includes a plurality of diodes. When the control circuit works, based on the voltage changes across each diode in the diode component, the on-off states of each diode in the diode component are controlled, so that the series-parallel relationship of the capacitors in the capacitor component can be adjusted through the diode component. Specifically, during the charging process of each capacitor in the capacitor component, the series-parallel relationship of each capacitor in the capacitor component is adjusted through the diode component, so that each capacitor in the capacitor component is first connected in parallel and then connected in series to divide the charging voltage from the bus voltage to the capacitor, thereby being able to reduce the charging voltage of the capacitor and reduce the withstand voltage value of the capacitor.

[0018] Among them, the above capacitor can specifically be an electrolytic capacitor. It can be understood that the withstand voltage value of the electrolytic capacitor must be higher than the highest voltage of the bus, and moreover, the cost of the electrolytic capacitor is affected by its withstand voltage value. Under the condition that parameters such as the capacitance value are the same, the higher the withstand voltage value of the capacitor, the higher the cost of the capacitor. Therefore, by adjusting the series-parallel relationship of the capacitors in the capacitor component through the diode component to reduce the charging voltage of the capacitor, thereby reducing the withstand voltage value of the capacitor, the capacitor cost can be reduced, and thus the manufacturing cost of the control circuit can be reduced.

[0019] Further, the input end of the inverter circuit is connected to the DC bus, and the output end of the inverter circuit is connected to the motor to be controlled. Specifically, during the operation of the control circuit, the inverter circuit obtains the DC voltage regulated by the capacitor component and the diode component through the DC bus, and converts the obtained DC voltage into an AC voltage to control the operating state of the motor to be controlled connected to the inverter circuit, thereby controlling the operation of the motor to be controlled.

[0020] In summary, the control circuit provided by the present invention is provided with a capacitor component and a diode component. When the control circuit operates, based on the voltage changes across each diode in the diode component, the on / off states of each diode in the diode component are controlled, so that the series-parallel relationship of the capacitors in the capacitor component can be adjusted through the diode component to reduce the charging voltage of the bus voltage to the capacitor, reduce the charging voltage of the capacitor, and thus reduce the withstand voltage value of the capacitor. In this way, the capacitor cost in the control circuit can be reduced, and thus the manufacturing cost of the control circuit can be reduced.

[0021] According to the above control circuit of the present invention, the following additional technical features may also be provided:

[0022] In some technical solutions, optionally, the DC bus includes a first bus and a second bus, and the capacitor component includes: a first capacitor, the first end of the first capacitor is connected to the first bus; a second capacitor, the first end of the second capacitor is connected to the second bus; a third capacitor, the first end of the third capacitor is connected to the first bus, and the second end of the third capacitor is connected to the second end of the second capacitor; a fourth capacitor, the first end of the fourth capacitor is connected to the second bus, and the second end of the fourth capacitor is connected to the second end of the first capacitor.

[0023] In this technical solution, the above DC bus may specifically include a first bus and a second bus. Among them, the first bus is used to indicate the P bus, and the second bus is used to indicate the N bus.

[0024] Further, the above capacitor component may specifically include a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor.

[0025] Among them, the first end of the first capacitor is connected to the first bus, and the second end of the first capacitor is connected to the second end of the fourth capacitor; the first end of the second capacitor is connected to the second bus, and the second end of the second capacitor is connected to the second end of the third capacitor; the first end of the third capacitor is connected to the first bus; the first end of the fourth capacitor is connected to the second bus.

[0026] In this technical solution, the working process of the control circuit is divided into two processes: the charging process and the discharging process. During the discharging process of the control circuit, at the initial stage of the discharging process, the AC voltage output by the AC power supply is at the peak or trough position. At this time, the bus voltage reaches the maximum value, and the capacitor assembly enters the discharging process. Among them, in the first stage, i.e., the initial stage, of the discharging process of the capacitor assembly, the first capacitor and the fourth capacitor are connected in series, the second capacitor and the third capacitor are connected in series, and the two groups of series-connected capacitors are then connected in parallel. The two groups of series-connected capacitors connected in parallel discharge to the DC bus. Similarly, in the first stage, i.e., the initial stage, of the charging process of the capacitor assembly, the first capacitor and the fourth capacitor are connected in series, the second capacitor and the third capacitor are connected in series, and the two groups of series-connected capacitors are then connected in parallel. The AC voltage charges the two groups of series-connected capacitors connected in parallel.

[0027] In the actual application process, the above-mentioned first capacitor, second capacitor, third capacitor, and fourth capacitor can all be single capacitors, and the above-mentioned first capacitor, second capacitor, third capacitor, and fourth capacitor can also be obtained by connecting multiple capacitors in series and parallel. No specific restrictions are made here.

[0028] In some technical solutions, optionally, the diode assembly includes: a first diode, the anode of the first diode is connected to the second end of the first capacitor, and the cathode of the first diode is connected to the second end of the second capacitor.

[0029] In this technical solution, the above-mentioned diode assembly includes a first diode.

[0030] Among them, the anode of the first diode is connected to the second end of the first capacitor, and the cathode of the first diode is connected to the second end of the second capacitor.

[0031] Specifically, the charging process of the capacitor assembly includes a first stage and a second stage. In the first stage, i.e., the initial stage, of the charging process of the capacitor assembly, the first capacitor and the fourth capacitor are connected in series, the second capacitor and the third capacitor are connected in series, and the AC voltage charges the two groups of series-connected capacitors. On this basis, when the voltage of the third capacitor is greater than the voltage of the first capacitor, or when the voltage of the fourth capacitor is greater than the voltage of the second capacitor, the charging process of the capacitor assembly enters the second stage. At this time, the first diode conducts, and the capacitor assembly is equivalent to the first capacitor and the third capacitor connected in parallel, the second capacitor and the fourth capacitor connected in parallel, and the two groups of parallel-connected capacitors are then connected in series. The AC voltage charges the two groups of parallel-connected capacitors connected in series.

[0032] Among them, when the charging of the capacitor assembly ends, the sum of the voltages of the two groups of parallel-connected capacitors is equal to the voltage peak value of the AC voltage output by the AC power supply. In this way, the charging voltage of the bus voltage to each group of parallel-connected capacitors decreases, reducing the charging voltage of each capacitor in the capacitor assembly, thereby reducing the withstand voltage value of the capacitor and the capacitor cost, and thus reducing the manufacturing cost of the control circuit.

[0033] In some technical solutions, optionally, the diode assembly further includes: a second diode, an anode of the second diode is connected to a second end of the second capacitor, and a cathode of the second diode is connected to the first bus; a third diode, an anode of the third diode is connected to the first bus, and a cathode of the third diode is connected to a second end of the first capacitor.

[0034] In this technical solution, the above diode assembly may specifically further include a second diode and a third diode.

[0035] Wherein, the anode of the second diode is connected to the second end of the second capacitor, and the cathode of the second diode is connected to the first bus. That is, the second diode is connected in parallel with the third capacitor.

[0036] Furthermore, the anode of the third diode is connected to the first bus, and the cathode of the third diode is connected to the second end of the first capacitor. That is, the third diode is connected in parallel with the fourth capacitor.

[0037] Specifically, the working process of the control circuit is divided into two processes: a charging process and a discharging process. During the discharging process of the control circuit, at the starting stage of the discharging process, the AC voltage output by the AC power supply is at the peak or trough position. At this time, the bus voltage reaches the maximum value, and the capacitor assembly enters the discharging process.

[0038] Among them, the discharging process of the capacitor assembly includes a first stage and a second stage. In the first stage, that is, the initial stage, of the discharging process of the capacitor assembly, the first capacitor and the fourth capacitor are connected in series, and the second capacitor and the third capacitor are connected in series. The two sets of series-connected capacitors are then connected in parallel, and the two sets of series-connected capacitors connected in parallel discharge to the DC bus. On this basis, when the voltages of the third capacitor and the fourth capacitor discharge to 0V, the discharging process of the capacitor assembly enters the second stage. At this time, the second diode and the third diode are turned on, the first capacitor is connected to the DC bus through the third diode, and the second capacitor is connected to the DC bus through the second diode. Based on this, the first capacitor discharges to the DC bus through the third diode, and the second capacitor discharges to the DC bus through the second diode.

[0039] In some technical solutions, optionally, the capacitance values of the first capacitor and the second capacitor are equal or close; the capacitance values of the third capacitor and the fourth capacitor are equal or close.

[0040] In this technical solution, the above first capacitor and second capacitor are main capacitors, and the above third capacitor and fourth capacitor are auxiliary capacitors.

[0041] Among them, the capacitance values of the main capacitors, namely the first capacitor and the second capacitor, are equal or close, and the capacitance values of the auxiliary capacitors, namely the third capacitor and the fourth capacitor, are equal or close. Based on this, during the charging process of the capacitor assembly, after the first diode conducts, the capacitor assembly is equivalent to the first capacitor and the third capacitor in parallel, and the second capacitor and the fourth capacitor in parallel. The two groups of capacitors after parallel connection are then connected in series, and the AC voltage charges the two groups of parallel-connected capacitors in series. At this time, since the capacitance values of the first capacitor and the second capacitor are equal or close, and the capacitance values of the third capacitor and the fourth capacitor are equal or close, it is possible to divide the charging voltage from the bus voltage to the capacitors, and the charging voltage from the bus voltage to each group of parallel capacitors is reduced, thereby being able to reduce the charging voltage of each capacitor in the capacitor assembly, thereby reducing the withstand voltage value of the capacitor and reducing the capacitor cost.

[0042] In some technical solutions, optionally, the capacitance value of the first capacitor is greater than the capacitance value of the third capacitor; the capacitance value of the second capacitor is greater than the capacitance value of the fourth capacitor.

[0043] In this technical solution, the above-mentioned first capacitor and second capacitor are the main capacitors, and the above-mentioned third capacitor and fourth capacitor are the auxiliary capacitors. Among them, the capacitance value of the main circuit is much larger than the capacitance value of the auxiliary capacitor.

[0044] That is to say, the capacitance value of the first capacitor is much larger than the capacitance value of the third capacitor, and the capacitance value of the second capacitor is much larger than the capacitance value of the fourth capacitor. Based on this, during the charging and discharging process of the capacitor assembly, it is possible to make the equivalent capacitance value during the charging process smaller than the equivalent capacitance value during the discharging process, that is, to make the control circuit have the characteristics of a small charging bus capacitor and a large discharging bus capacitor. In this way, the conduction angle of the control circuit increases, which can improve the current harmonics on the AC side, thereby reducing the material cost of the filter circuit and reducing the manufacturing cost of the control circuit.

[0045] In some technical solutions, optionally, the filter circuit includes: a differential-mode inductor, the first end of the differential-mode inductor is connected to the AC power supply; a filter, which is connected to the second end of the differential-mode inductor and the AC power supply.

[0046] In this technical solution, the above-mentioned filter circuit may specifically include a differential-mode inductor and a filter.

[0047] Among them, the first end of the differential-mode inductor is connected to the AC power supply, and the second end of the differential-mode inductor is connected to the filter.

[0048] Furthermore, the input end of the filter is connected to both the second end of the differential-mode inductor and the AC power supply. The first output end of the filter is connected to the first bus, and the second output end of the filter is connected to the second bus.

[0049] It can be understood that in the control circuit proposed by the present invention, the charging bus capacitor of the control circuit is small while the discharging bus capacitor is large. When the conduction angle of the control circuit increases, the current harmonics on the AC side can be improved. Based on this, the inductance value and volume of the above-mentioned differential-mode inductor can be correspondingly reduced, thereby reducing the cost of the differential-mode inductor and the manufacturing cost of the control circuit, which is beneficial to the miniaturization and high cost performance of the control circuit.

[0050] According to the second aspect of the present invention, a controller is proposed, including: the control circuit in any technical solution of the first aspect above. The controller proposed in the second aspect of the present invention includes the control circuit in any technical solution of the first aspect above. Therefore, the controller proposed in the second aspect of the present invention has all the beneficial effects of the control circuit in any technical solution of the first aspect above, which will not be elaborated here.

[0051] According to the third aspect of the present invention, a motor is proposed, including: the controller in the technical solution of the second aspect above. The motor proposed in the third aspect of the present invention includes the controller in the technical solution of the second aspect above. Therefore, the motor proposed in the third aspect of the present invention has all the beneficial effects of the controller in the technical solution of the second aspect above, which will not be elaborated here.

[0052] According to the fourth aspect of the present invention, an electrical equipment is proposed, including: the motor in the technical solution of the third aspect above. The electrical equipment proposed in the fourth aspect of the present invention includes the motor in the technical solution of the third aspect above. Therefore, the electrical equipment proposed in the fourth aspect of the present invention has all the beneficial effects of the motor in the technical solution of the third aspect above, which will not be elaborated here.

[0053] In the actual application process, the above-mentioned electrical equipment includes but is not limited to: washing machines, air conditioners, electric fans, refrigerators, exhaust fans, sewage pumps, range hoods, generators, compressors, and water pumps, etc., which require motors to work, and no specific limitations are made here.

[0054] The additional aspects and advantages of the present invention will become obvious in the following description part, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0056] Figure 1 A schematic structural diagram of the control circuit according to an embodiment of the present invention is shown;

[0057] Figure 2 A schematic working principle diagram of the control circuit according to an embodiment of the present invention is shown;

[0058] Figure 3 Shows the structural block diagram of the controller according to an embodiment of the present invention;

[0059] Figure 4 Shows the structural block diagram of the motor according to an embodiment of the present invention;

[0060] Figure 5 Shows the structural block diagram of the electrical equipment according to an embodiment of the present invention.

[0061] Among them, Figure 1 The corresponding relationship between the structural components and the reference numerals in is:

[0062] 100 control circuit, 102 filtering circuit, 104 rectifying circuit, 106 inverting circuit, 108 first capacitor, 110 second capacitor, 112 third capacitor, 114 fourth capacitor, 116 first diode, 118 second diode, 120 third diode, 122 differential-mode inductor, 124 filter, 126 fourth diode, 128 fifth diode, 130 sixth diode, 132 seventh diode, 134 first triode, 136 second triode, 138 third triode, 140 fourth triode, 142 fifth triode, 144 sixth triode, 146 rectifier bridge. Specific embodiments

[0063] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0064] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the limitations of the specific embodiments disclosed below.

[0065] The following combines Figures 1 to 5 , and the control circuit, controller, motor and electrical equipment provided by the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0066] Among them, Figure 1 Shows the schematic structural diagram of the control circuit according to an embodiment of the present invention; Figure 2 Shows the working principle diagram of the control circuit according to an embodiment of the present invention; Figure 3 Shows the structural block diagram of the controller according to an embodiment of the present invention; Figure 4 Shows the structural block diagram of the motor according to an embodiment of the present invention; Figure 5 Shows the structural block diagram of the electrical equipment according to an embodiment of the present invention.

[0067] In one embodiment of the present invention, as Figure 1 shown, the present invention provides a control circuit 100.

[0068] The control circuit 100 provided by the present invention is used to control the operation of a motor to be controlled. Moreover, by controlling the operation of the motor to be controlled through the control circuit 100 provided by the present invention, the charging voltage of a capacitor in the circuit can be reduced, thereby reducing the withstand voltage value of the capacitor and the manufacturing cost of the circuit.

[0069] Specifically, as Figure 1 shown, the control circuit 100 provided by the present invention includes a filter circuit 102, a rectifier circuit 104, and an inverter circuit 106.

[0070] Among them, the filter circuit 102 is connected to an AC power supply AC and a DC bus. Further, the rectifier circuit 104 is connected to the filter circuit 102 and the DC bus. Further, the inverter circuit 106 is connected to the rectifier circuit 104 and the DC bus.

[0071] Among them, the above-mentioned filter circuit 102 is used to filter the input signal of the control circuit 100, thereby reducing the interference signals input into the internal circuit and the overall device to meet the current harmonic requirements of the control circuit 100, so as to ensure the stable operation of the circuit and the device.

[0072] Further, the above-mentioned AC power supply AC provides an AC voltage for the rectifier circuit 104, so that the rectifier circuit 104 converts the AC voltage into a DC voltage to supply power to the DC bus.

[0073] Further, the above-mentioned DC bus provides a DC voltage for the inverter circuit 106, so that the inverter circuit 106 converts the DC voltage into an AC voltage to provide an AC voltage for the motor to be controlled controlled by the control circuit 100. Among them, the above-mentioned DC bus may specifically include a first bus and a second bus. Among them, the first bus is used to indicate the P bus, and the second bus is used to indicate the N bus.

[0074] Further, as Figure 1 shown, the rectifier circuit 104 includes a rectifier bridge 146. The input end of the rectifier bridge 146 is connected to the AC power supply AC through the filter circuit 102, and the output end of the rectifier bridge 146 is connected to the above-mentioned DC bus. Specifically, when the control circuit 100 is operating, the rectifier bridge 146 can obtain an AC voltage from the AC power supply AC and can convert the AC voltage into a DC voltage and input it to the above-mentioned DC bus to supply power to the above-mentioned DC bus.

[0075] Among them, as Figure 1As shown, the rectifier bridge 146 includes a fourth diode 126, a fifth diode 128, a sixth diode 130, and a seventh diode 132. Among them, the anode of the fourth diode 126 is connected to the first output terminal of the filter circuit 102 and the cathode of the sixth diode 130, the cathode of the fourth diode 126 is connected to the first bus, the anode of the fifth diode 128 is connected to the second output terminal of the filter circuit 102 and the cathode of the seventh diode 132, the cathode of the fifth diode 128 is connected to the first bus, and the anodes of the sixth diode 130 and the seventh diode 132 are both connected to the second bus.

[0076] Furthermore, the rectifier circuit 104 further includes a capacitor component and a diode component. The capacitor component includes a plurality of capacitors, and the diode component includes a plurality of diodes. When the control circuit 100 is operating, based on the voltage changes across each diode in the diode component, the on / off states of each diode in the diode component are controlled, so that the series-parallel relationship of the capacitors in the capacitor component can be adjusted through the diode component. Specifically, during the charging process of each capacitor in the capacitor component, the series-parallel relationship of each capacitor in the capacitor component is adjusted through the diode component, so that each capacitor in the capacitor component is first connected in parallel and then connected in series, in order to divide the charging voltage from the bus voltage to the capacitor, thereby reducing the charging voltage of the capacitor and the withstand voltage value of the capacitor.

[0077] Among them, the above capacitor can specifically be an electrolytic capacitor. It can be understood that the withstand voltage value of the electrolytic capacitor must be higher than the highest voltage of the bus, and the cost of the electrolytic capacitor is affected by its withstand voltage value. Under the condition that parameters such as the capacitance value are the same, the higher the withstand voltage value of the capacitor, the higher the cost of the capacitor. Therefore, by adjusting the series-parallel relationship of the capacitors in the capacitor component through the diode component to reduce the charging voltage of the capacitor, thereby reducing the withstand voltage value of the capacitor, the capacitor cost can be reduced, and thus the manufacturing cost of the control circuit 100 can be reduced.

[0078] In the actual application process, the rectifier circuit 104 can specifically adopt a topology structure including 4 electrolytic capacitors and 3 diodes. Compared with the conventional topology structure using a single electrolytic capacitor, the withstand voltage value of the electrolytic capacitor in the topology structure adopted by the present invention is only half of the withstand voltage value of the electrolytic capacitor in the conventional topology structure. Although the number of electrolytic capacitors in the topology structure adopted by the present invention is larger, its cost is equivalent to or slightly lower than that of the scheme using a single electrolytic capacitor.

[0079] Further, the input end of the inverter circuit 106 is connected to the DC bus, and the output end of the inverter circuit 106 is connected to the motor to be controlled. Specifically, during the operation of the control circuit 100, the inverter circuit 106 obtains the DC voltage regulated by the capacitor assembly and the diode assembly through the DC bus, and converts the obtained DC voltage into an AC voltage to control the operating state of the motor to be controlled connected to the inverter circuit 106, thereby controlling the operation of the motor to be controlled.

[0080] In the actual application process, such as Figure 1 shown, the above-mentioned inverter circuit 106 may specifically include a first triode 134, a second triode 136, a third triode 138, a fourth triode 140, a fifth triode 142, and a sixth triode 144. Among them, the collectors of the first triode 134, the third triode 138, and the fifth triode 142 are all connected to the first bus, the emitters of the second triode 136, the fourth triode 140, and the sixth triode 144 are all connected to the second bus, the emitter of the first triode 134 is connected to both the collector of the second triode 136 and the motor to be controlled, the emitter of the third triode 138 is connected to both the collector of the fourth triode 140 and the motor to be controlled, and the emitter of the fifth triode 142 is connected to both the collector of the sixth triode 144 and the motor to be controlled. And, each triode is connected in parallel with a diode to protect the triode.

[0081] In summary, the control circuit 100 provided by the present invention is provided with a capacitor assembly and a diode assembly. When the control circuit 100 operates, based on the voltage changes across the diodes in the diode assembly, the on-off states of the diodes in the diode assembly are controlled, so that the series-parallel relationship of the capacitors in the capacitor assembly can be adjusted through the diode assembly to reduce the charging voltage of the bus voltage to the capacitor, reduce the charging voltage of the capacitor, and thus reduce the withstand voltage value of the capacitor. In this way, the capacitor cost in the control circuit 100 can be reduced, and thus the manufacturing cost of the control circuit 100 can be reduced.

[0082] In some embodiments of the present invention, optionally, such as Figure 1 shown, the above-mentioned DC bus may specifically include a first bus and a second bus. Among them, the first bus is used to indicate the P bus, and the second bus is used to indicate the N bus.

[0083] Further, such as Figure 1 shown, the above-mentioned capacitor assembly may specifically include a first capacitor 108, a second capacitor 110, a third capacitor 112, and a fourth capacitor 114.

[0084] Among them, such as Figure 1As shown, the first end of the first capacitor 108 is connected to the first busbar, and the second end of the first capacitor 108 is connected to the second end of the fourth capacitor 114; the first end of the second capacitor 110 is connected to the second busbar, and the second end of the second capacitor 110 is connected to the second end of the third capacitor 112; the first end of the third capacitor 112 is connected to the first busbar; the first end of the fourth capacitor 114 is connected to the second busbar.

[0085] In this technical solution, the working process of the control circuit 100 is divided into two processes: the charging process and the discharging process. During the discharging process of the control circuit 100, at the starting stage of the discharging process, the AC voltage output by the AC power supply AC is at the peak or trough position. At this time, the busbar voltage reaches the maximum value, and the capacitor assembly enters the discharging process. Among them, in the first stage, i.e., the initial stage, of the discharging process of the capacitor assembly, the first capacitor 108 and the fourth capacitor 114 are connected in series, and the second capacitor 110 and the third capacitor 112 are connected in series. The two sets of series-connected capacitors are then connected in parallel, and the two sets of series-connected capacitors connected in parallel discharge to the DC busbar. Similarly, in the first stage, i.e., the initial stage, of the charging process of the capacitor assembly, the first capacitor 108 and the fourth capacitor 114 are connected in series, and the second capacitor 110 and the third capacitor 112 are connected in series. The two sets of series-connected capacitors are then connected in parallel, and the AC voltage charges the two sets of series-connected capacitors connected in parallel.

[0086] In the actual application process, the above-mentioned first capacitor 108, second capacitor 110, third capacitor 112, and fourth capacitor 114 can all be single capacitors, and the above-mentioned first capacitor 108, second capacitor 110, third capacitor 112, and fourth capacitor 114 can also be obtained by connecting multiple capacitors in series and parallel. No specific limitation is made here.

[0087] In some embodiments of the present invention, optionally, as Figure 1 shown, the above-mentioned diode assembly includes a first diode 116.

[0088] Among them, as Figure 1 shown, the anode of the first diode 116 is connected to the second end of the first capacitor 108, and the cathode of the first diode 116 is connected to the second end of the second capacitor 110.

[0089] Specifically, the charging process of the capacitor assembly includes a first stage and a second stage. In the first stage, i.e., the initial stage, of the charging process of the capacitor assembly, the first capacitor 108 is in series with the fourth capacitor 114, and the second capacitor 110 is in series with the third capacitor 112. The AC voltage charges the two series-connected groups of capacitors. On this basis, when the voltage of the third capacitor 112 is greater than the voltage of the first capacitor 108, or when the voltage of the fourth capacitor 114 is greater than the voltage of the second capacitor 110, the charging process of the capacitor assembly enters the second stage. At this time, the first diode 116 conducts, and the capacitor assembly is equivalent to the first capacitor 108 and the third capacitor 112 in parallel, and the second capacitor 110 and the fourth capacitor 114 in parallel. The two parallel-connected groups of capacitors are then connected in series, and the AC voltage charges the two series-connected groups of parallel capacitors.

[0090] Among them, at the end of the charging of the capacitor assembly, the sum of the voltages of the two parallel-connected groups of capacitors is equal to the voltage peak value of the AC voltage output by the AC power supply AC. Thus, as Figure 2 shown, the charging voltage from the bus voltage to each parallel-connected capacitor decreases, reducing the charging voltage of each capacitor in the capacitor assembly, thereby reducing the withstand voltage value of the capacitor and the capacitor cost, and thus reducing the manufacturing cost of the control circuit 100.

[0091] In some embodiments of the present invention, optionally, as Figure 1 shown, the above diode assembly may specifically further include a second diode 118 and a third diode 120.

[0092] Among them, as Figure 1 shown, the anode of the second diode 118 is connected to the second end of the second capacitor 110, and the cathode of the second diode 118 is connected to the first bus. That is, the second diode 118 is connected in parallel with the third capacitor 112.

[0093] Furthermore, as Figure 1 shown, the anode of the third diode 120 is connected to the first bus, and the cathode of the third diode 120 is connected to the second end of the first capacitor 108. That is, the third diode 120 is connected in parallel with the fourth capacitor 114.

[0094] Specifically, the working process of the control circuit 100 is divided into two processes: a charging process and a discharging process. In the discharging process of the control circuit 100, at the starting stage of the discharging process, the AC voltage output by the AC power supply AC is at the peak or trough position. At this time, the bus voltage reaches the maximum value, and the capacitor assembly enters the discharging process.

[0095] Among them, the discharge process of the capacitor assembly includes a first stage and a second stage. In the first stage, i.e., the initial stage, of the discharge process of the capacitor assembly, the first capacitor 108 and the fourth capacitor 114 are connected in series, and the second capacitor 110 and the third capacitor 112 are connected in series. The two sets of series-connected capacitors are then connected in parallel, and the two sets of series-connected capacitors connected in parallel discharge to the DC bus. On this basis, when the voltages of the third capacitor 112 and the fourth capacitor 114 discharge to 0V, the discharge process of the capacitor assembly enters the second stage. At this time, the second diode 118 and the third diode 120 are turned on, the first capacitor 108 is connected to the DC bus through the third diode 120, and the second capacitor 110 is connected to the DC bus through the second diode 118. Based on this, the first capacitor 108 discharges to the DC bus through the third diode 120, and the second capacitor 110 discharges to the DC bus through the second diode 118.

[0096] In some embodiments of the present invention, optionally, as Figure 1 shown, the above-mentioned first capacitor 108 and second capacitor 110 are main capacitors, and the above-mentioned third capacitor 112 and fourth capacitor 114 are auxiliary capacitors.

[0097] Among them, the capacitance values of the main capacitors, i.e., the first capacitor 108 and the second capacitor 110, are equal or close, and the capacitance values of the auxiliary capacitors, i.e., the third capacitor 112 and the fourth capacitor 114, are equal or close. Based on this, during the charging process of the capacitor assembly, after the first diode 116 is turned on, the capacitor assembly is equivalent to the first capacitor 108 and the third capacitor 112 connected in parallel, and the second capacitor 110 and the fourth capacitor 114 connected in parallel. The two sets of parallel-connected capacitors are then connected in series, and the AC voltage charges the two sets of series-connected parallel capacitors. At this time, since the capacitance values of the first capacitor 108 and the second capacitor 110 are equal or close, and the capacitance values of the third capacitor 112 and the fourth capacitor 114 are equal or close, the charging voltage from the bus voltage to the capacitors can be divided, and the charging voltage from the bus voltage to each set of parallel capacitors is reduced, so that the charging voltage of each capacitor in the capacitor assembly can be reduced, thereby reducing the withstand voltage value of the capacitor and reducing the capacitor cost.

[0098] For example, when the capacitance values of the first capacitor 108 and the second capacitor 110 are equal, and the capacitance values of the third capacitor 112 and the fourth capacitor 114 are equal, during the charging process of the capacitor assembly, after the first diode 116 is turned on, the capacitor assembly is equivalent to two capacitors in parallel and then in series, that is, the first capacitor 108 is in parallel with the third capacitor 112, and the second capacitor 110 is in parallel with the fourth capacitor 114, and the two sets of parallel capacitors are then in series. At this time, during the charging process of the capacitor assembly, since the capacitance values of the first capacitor 108 and the second capacitor 110 are equal, and the capacitance values of the third capacitor 112 and the fourth capacitor 114 are equal, the charging voltage of the first capacitor 108 and the third capacitor 112 in parallel is equal to the charging voltage of the second capacitor 110 and the fourth capacitor 114 in parallel, and the charging voltage of the two sets of parallel capacitors is half of the highest bus voltage. In this way, for the withstand voltage values of the first capacitor 108, the second capacitor 110, the third capacitor 112, and the fourth capacitor 114, they are only half of the withstand voltage value of the electrolytic capacitor in the traditional topology structure, reducing the withstand voltage value of the capacitor, thereby being able to reduce the capacitor cost and the manufacturing cost of the circuit.

[0099] That is to say, compared with the topology structure that conventionally uses a single electrolytic capacitor, the withstand voltage value of the electrolytic capacitor in the topology structure adopted by the present invention is only half of the withstand voltage value of the electrolytic capacitor in the conventional topology structure. Although the number of electrolytic capacitors in the topology structure adopted by the present invention is larger, its cost is equivalent to or slightly lower than that of the solution using a single electrolytic capacitor.

[0100] In some embodiments of the present invention, optionally, as Figure 1 shown, the above-mentioned first capacitor 108 and second capacitor 110 are main capacitors, and the above-mentioned third capacitor 112 and fourth capacitor 114 are auxiliary capacitors. Among them, the capacitance value of the main circuit is much larger than that of the auxiliary capacitor.

[0101] That is, the capacitance value of the first capacitor 108 is much larger than that of the third capacitor 112, and the capacitance value of the second capacitor 110 is much larger than that of the fourth capacitor 114. Based on this, during the charging and discharging process of the capacitor assembly, it can be ensured that the equivalent capacitance value during the charging process is less than the equivalent capacitance value during the discharging process, that is, the control circuit 100 has the characteristics of a small charging bus capacitor and a large discharging bus capacitor. In this way, the conduction angle of the control circuit 100 is increased, which can improve the current harmonics on the AC side, thereby reducing the material cost of the filter circuit 102 and the manufacturing cost of the control circuit 100.

[0102] For example, when the capacitance values of the first capacitor 108 and the second capacitor 110 are C1, the capacitance values of the third capacitor 112 and the fourth capacitor 114 are C2, and C1 is much larger than C2, in the first stage of the charging process of the capacitor assembly, the first capacitor 108 is in series with the fourth capacitor 114, and the second capacitor 110 is in series with the third capacitor 112. The two series-connected capacitor groups are then connected in parallel. At this time, the equivalent capacitance value of the circuit, i.e., the charging bus capacitance, is 2×C1×C2 / (C1 + C2). Since C1 is much larger than C2, 2×C1×C2 / (C1 + C2) is equivalent to 2×C2. Further, in the second stage of the charging process of the capacitor assembly, the first capacitor 108 is in parallel with the third capacitor 112, and the second capacitor 110 is in parallel with the fourth capacitor 114. The two parallel-connected capacitor groups are then connected in series. At this time, the equivalent capacitance value of the circuit, i.e., the charging bus capacitance, is (C1 + C2) / 2.

[0103] Further, in the first stage of the discharging process of the capacitor assembly, the first capacitor 108 is in series with the fourth capacitor 114, and the second capacitor 110 is in series with the third capacitor 112. The two series-connected capacitor groups are then connected in parallel. At this time, the equivalent capacitance value of the circuit, i.e., the discharging bus capacitance, is 2×C1×C2 / (C1 + C2). Since C1 is much larger than C2, 2×C1×C2 / (C1 + C2) is equivalent to 2×C2. Further, in the second stage of the discharging process of the capacitor assembly, the voltages of the third capacitor 112 and the fourth capacitor 114 are discharged to 0V. The first capacitor 108 is connected to the DC bus through the third diode 120, and the second capacitor 110 is connected to the DC bus through the second diode 118, that is, the first capacitor 108 and the second capacitor 110 are in parallel. At this time, the equivalent capacitance value of the circuit, i.e., the discharging bus capacitance, is 2×C1. It can be seen that the charging bus capacitance of the control circuit 100 is small while the discharging bus capacitance is large. By increasing the conduction angle of the control circuit 100, the current harmonics on the AC side can be improved, thereby reducing the material cost of the filtering circuit 102 and the manufacturing cost of the control circuit 100.

[0104] In some embodiments of the present invention, optionally, as Figure 1 shown, the above-mentioned filtering circuit 102 may specifically include a differential-mode inductor 122 and a filter 124.

[0105] Among them, as Figure 1 shown, the first end of the differential-mode inductor 122 is connected to the AC power supply AC, and the second end of the differential-mode inductor 122 is connected to the filter 124.

[0106] Further, as Figure 1 shown, the input end of the filter 124 is connected to both the second end of the differential-mode inductor 122 and the AC power supply AC. The first output end of the filter 124 is connected to the first bus, and the second output end of the filter 124 is connected to the second bus.

[0107] It can be understood that in the control circuit 100 proposed by the present invention, the charging bus capacitor of the control circuit 100 is small while the discharging bus capacitor is large. When the conduction angle of the control circuit 100 increases, the current harmonics on the AC side can be improved. Based on this, the inductance value and volume of the above-mentioned differential-mode inductor 122 can be correspondingly reduced, thereby reducing the cost of the differential-mode inductor 122 and the manufacturing cost of the control circuit 100, which is beneficial to the miniaturization and high cost performance of the control circuit 100.

[0108] In the actual application process, the above-mentioned filter 124 can specifically be an EMC (Electro Magnetic Compatibility) filter. The EMC filter is used to suppress electromagnetic interference. Its main function is to filter out electromagnetic interference in channels such as wires, cables or power supplies, prevent this interference from entering the power system or equipment, and at the same time can also prevent the electromagnetic interference of the power system from affecting external devices. Specifically, the EMC filter is suitable for suppressing grid noise, high harmonics, and the noise and high-frequency harmonics generated by switching power supplies.

[0109] In an embodiment of the present invention, a controller is also proposed. As Figure 3 shown, Figure 3 FIG. shows the structural block diagram of the controller 300 according to an embodiment of the present invention. Among them, the controller 300 is the control circuit 100 in any one of the above first aspects.

[0110] The controller 300 proposed in the second aspect of the present invention includes the control circuit 100 in any one of the above first aspects. Therefore, the controller 300 proposed in the second aspect of the present invention has all the beneficial effects of the control circuit 100 in any one of the above first aspects, which will not be elaborated here.

[0111] In an embodiment of the present invention, a motor is also proposed. As Figure 4 shown, Figure 4 FIG. shows the structural block diagram of the motor 400 according to an embodiment of the present invention. Among them, the motor 400 includes the controller 300 in the embodiment of the above second aspect.

[0112] The motor 400 proposed in the third aspect of the present invention includes the controller 300 in the embodiment of the above second aspect. Therefore, the motor 400 proposed in the third aspect of the present invention has all the beneficial effects of the controller 300 in the embodiment of the above second aspect, which will not be elaborated here.

[0113] In an embodiment of the present invention, an electrical equipment is also proposed. As Figure 5 shown, Figure 5The structural block diagram of the electrical device 500 according to an embodiment of the present invention is shown. Among them, the electrical device 500 includes the motor 400 in the embodiment of the third aspect described above.

[0114] The electrical device 500 proposed in the fourth aspect of the present invention includes the motor 400 in the embodiment of the third aspect described above. Therefore, the electrical device 500 proposed in the fourth aspect of the present invention has all the beneficial effects of the motor 400 in the embodiment of the third aspect described above, which will not be elaborated here.

[0115] In the actual application process, the above-mentioned electrical device 500 includes but is not limited to: washing machines, air conditioners, electric fans, refrigerators, exhaust fans, sewage pumps, range hoods, generators, compressors, water pumps and other devices that need to use motors to work, and no specific restrictions are made here.

[0116] In the description of this specification, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance unless otherwise clearly specified and defined; the terms "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0117] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0118] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0119] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control circuit, characterized in that, Comprising: A filter circuit, connected to an AC power supply and a DC bus; A rectifier circuit, connected to the filter circuit, the rectifier circuit being configured to convert the AC voltage output by the AC power supply into a DC voltage to supply power to the DC bus; the rectifier circuit includes a capacitor assembly and a diode assembly, and the connection relationship of the capacitors in the capacitor assembly is adjusted through the diode assembly to reduce the charging voltage of the capacitors; An inverter circuit, connected to the rectifier circuit, the inverter circuit being configured to convert the DC voltage on the DC bus into an AC voltage.

2. The control circuit according to claim 1, wherein The DC bus includes a first bus and a second bus, and the capacitor assembly includes: A first capacitor, the first end of the first capacitor is connected to the first bus; A second capacitor, the first end of the second capacitor is connected to the second bus; A third capacitor, the first end of the third capacitor is connected to the first bus, and the second end of the third capacitor is connected to the second end of the second capacitor; A fourth capacitor, the first end of the fourth capacitor is connected to the second bus, and the second end of the fourth capacitor is connected to the second end of the first capacitor.

3. The control circuit according to claim 2, wherein The diode assembly includes: A first diode, the anode of the first diode is connected to the second end of the first capacitor, and the cathode of the first diode is connected to the second end of the second capacitor.

4. The control circuit according to claim 2, wherein The diode assembly further includes: A second diode, the anode of the second diode is connected to the second end of the second capacitor, and the cathode of the second diode is connected to the first bus; A third diode, the anode of the third diode is connected to the first bus, and the cathode of the third diode is connected to the second end of the first capacitor.

5. The control circuit according to claim 2, wherein The capacitance values of the first capacitor and the second capacitor are equal or close; the capacitance values of the third capacitor and the fourth capacitor are equal or close.

6. The control circuit according to claim 2, wherein The capacitance value of the first capacitor is greater than the capacitance value of the third capacitor; the capacitance value of the second capacitor is greater than the capacitance value of the fourth capacitor.

7. The control circuit according to any one of claims 1 to 6, characterized in that, The filter circuit includes: A differential-mode inductor, the first end of the differential-mode inductor is connected to the AC power supply; A filter, connected to the second end of the differential-mode inductor and the AC power supply.

8. A controller, characterized in that, Comprising: The control circuit according to any one of claims 1 to 7.

9. A motor, characterized in that, Comprising: The controller according to claim 8.

10. An electrical device, characterized in that, Comprising: The motor according to claim 9.

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