Energy feedback circuit and driver of single-phase alternating current equipment

Abstract

The embodiment of the utility model discloses an energy feedback circuit and a driver of single-phase alternating current equipment. The energy feedback circuit of the single-phase AC equipment comprises a control module, a sampling module, an electric energy feedback control module and a rectification module, the sampling module is used for collecting a power grid voltage phase of a power grid and driving voltage of a driving bus; the rectification module is used for rectifying power grid electric energy transmitted by the power grid and driving electric energy transmitted by the driving bus, the control module is used for generating feedback control signals according to the power grid voltage phase and the driving voltage, and the electric energy feedback control module is used for outputting the driving electric energy to the power grid according to the feedback control signals. The energy feedback circuit of the single-phase alternating-current equipment provided by the utility model can quickly reduce the voltage of the driving bus, thereby accelerating the braking speed and saving the braking electric energy.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of motor control, and in particular to an energy feedback circuit and a driver for a single-phase AC device. Background Art

[0002] Traditional single-phase AC equipment drive devices, such as drivers and frequency converters, all use resistor heating to achieve energy consumption braking. Although the power of a driver is relatively small, with the gradual development of automation equipment, the use of drivers has gradually increased, and one automation equipment uses at least three. In addition, most drivers run at high speeds and brake frequently, so using resistors for energy consumption braking will waste a lot of electricity. Utility Model Content

[0003] The embodiment of the utility model provides an energy feedback circuit and a driver for a single-phase AC device, so that when the single-phase AC device is braked, the electric energy generated by the braking of the single-phase AC device can be recovered to achieve the purpose of saving electric energy.

[0004] In a first aspect, an embodiment of the utility model provides an energy feedback circuit of a single-phase AC device, the energy feedback circuit of the single-phase AC device includes a control module, a sampling module, an electric energy feedback control module and a rectifier module;

[0005] The first end and the second end of the sampling module are both connected to the power grid, the third end, the fourth end and the fifth end of the sampling module are all connected to the control module, the first end and the second end of the rectifier module are both connected to the power grid, the third end of the rectifier module, the fourth end of the sampling module, the first end of the power feedback control module, the fourth end of the rectifier module, the fifth end of the rectifier module, the fifth end of the sampling module, the second end of the power feedback control module, and the sixth end of the rectifier module are all connected to the drive bus, the seventh end of the rectifier module is connected to the single-phase AC device, the third end and the fourth end of the power feedback control module are both connected to the power grid, and the fifth end and the sixth end of the power feedback control module are both connected to the control module;

[0006] The sampling module is used to collect the grid voltage phase of the grid and the driving voltage of the driving bus; the rectifying module is used to rectify the grid power transmitted by the grid and the driving power transmitted by the driving bus; the control module is used to generate a feedback control signal according to the grid voltage phase and the driving voltage; the power feedback control module is used to output the driving power to the grid according to the feedback control signal.

[0007] Optionally, the power feedback control module includes a first power feedback control unit and a second power feedback control unit;

[0008] The first end of the first power feedback control unit serves as the first end of the power feedback control module, the second end of the first power feedback control unit serves as the third end of the power feedback control module, and the control end of the first power feedback control unit serves as the fifth end of the power feedback control module;

[0009] The first end of the second power feedback control unit serves as the second end of the power feedback control module, the second end of the second power feedback control unit serves as the fourth end of the power feedback control module, and the control end of the second power feedback control unit serves as the sixth end of the power feedback control module.

[0010] Optionally, the first power feedback control unit includes a first transistor, and the second power feedback control unit includes a second transistor;

[0011] The first electrode of the first transistor serves as the first end of the first power feedback control unit, the second electrode of the first transistor serves as the second end of the first power feedback control unit, and the control end of the first transistor serves as the control end of the first power feedback control unit;

[0012] The first electrode of the second transistor serves as the first end of the second power feedback control unit, the second electrode of the second transistor serves as the second end of the second power feedback control unit, and the control end of the second transistor serves as the control end of the second power feedback control unit.

[0013] Optionally, the sampling module includes a first acquisition unit and a second acquisition unit;

[0014] The first end of the first acquisition unit serves as the first end of the sampling module, the second end of the first acquisition unit serves as the second end of the sampling module, the third end of the first acquisition unit serves as the third end of the sampling module, and the first acquisition unit is used to acquire the grid voltage phase of the grid;

[0015] The first end of the second acquisition unit serves as the fourth end of the sampling module, the second end of the second acquisition unit serves as the fifth end of the sampling module, and the second acquisition unit is used to acquire the driving voltage of the driving bus.

[0016] Optionally, the first acquisition unit includes a phase-locked loop, and the second acquisition unit includes a first capacitor;

[0017] The first end of the phase-locked loop serves as the first end of the first acquisition unit, the second end of the phase-locked loop serves as the second end of the first acquisition unit, and the third end of the phase-locked loop serves as the third end of the first acquisition unit;

[0018] The first electrode of the first capacitor serves as the first end of the second acquisition unit, and the second electrode of the first capacitor serves as the second end of the second acquisition unit.

[0019] Optionally, the rectifier module includes a first rectifier unit and a second rectifier unit;

[0020] The first end of the first rectifier unit serves as the first end of the rectifier module, the second end of the first rectifier unit serves as the second end of the rectifier module, the third end of the first rectifier unit serves as the third end of the rectifier module, and the fourth end of the first rectifier unit serves as the fifth end of the rectifier module;

[0021] The first end of the second rectifier unit serves as the fourth end of the rectifier module, the second end of the second rectifier unit serves as the sixth end of the rectifier module, and the third end of the second rectifier unit serves as the seventh end of the rectifier module.

[0022] Optionally, the first rectifying unit includes a first diode, a second diode, a third diode and a fourth diode;

[0023] The anode of the first diode is connected to the cathode of the second diode and serves as the first end of the first rectifying unit, the anode of the third diode is connected to the cathode of the fourth diode and serves as the second end of the first rectifying unit, the cathode of the first diode is connected to the cathode of the third diode and serves as the third end of the first rectifying unit, and the anode of the second diode is connected to the anode of the fourth diode and serves as the fourth end of the first rectifying unit;

[0024] The second rectifying unit comprises an inverter;

[0025] The first end of the inverter serves as the first end of the second rectifying unit, and the second end of the inverter serves as the second end of the second rectifying unit.

[0026] Optionally, the energy feedback circuit of the single-phase AC device further includes a filtering module;

[0027] The first end and the second end of the filter module are connected to the power grid, and the third end of the filter module is connected to the third end of the power feedback control module;

[0028] The filtering module is used to filter the driving electric energy.

[0029] Optionally, the filtering module includes an inductor and a second capacitor;

[0030] The first end of the inductor is connected to the first end of the second capacitor and serves as the first end of the filter module, the second end of the second capacitor serves as the second end of the filter module, and the second end of the inductor serves as the third end of the filter module.

[0031] In a second aspect, an embodiment of the utility model further provides a driver, which includes the energy feedback circuit of the single-phase AC device provided by any embodiment of the utility model.

[0032] The energy feedback circuit of the single-phase AC device provided in the embodiment of the utility model collects the grid voltage phase of the grid and the driving voltage of the driving bus through the sampling module, the control module generates a feedback control signal according to the grid voltage phase and the driving voltage, and the power feedback control module outputs the driving electric energy to the grid according to the feedback control signal. Therefore, when the grid voltage phase is in a specific range and the driving voltage is greater than a specific threshold (the single-phase AC device is braked), the driving bus and the grid connection loop can be turned on to output the driving electric energy to the grid, thereby reducing the driving bus voltage. Compared with the prior art that achieves the purpose of reducing the driving bus voltage through resistance energy consumption, the energy feedback circuit of the single-phase AC device provided in the embodiment of the utility model can quickly reduce the driving bus voltage, thereby accelerating the braking speed and saving braking electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of the structure of an energy feedback circuit for a single-phase AC device provided by an embodiment of the utility model;

[0035] Figure 2 A schematic diagram of the structure of another energy feedback circuit of a single-phase AC device provided by an embodiment of the utility model;

[0036] Figure 3 A curve showing a change in grid voltage when a single-phase AC device is braked, provided in an embodiment of the utility model;

[0037] Figure 4 A schematic structural diagram of an energy feedback circuit of another single-phase AC device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Figure 1 A schematic diagram of the structure of an energy feedback circuit of a single-phase AC device provided by an embodiment of the utility model, such as Figure 1 As shown, the energy feedback circuit of the single-phase AC device includes a control module 110, a sampling module 120, an electric energy feedback control module 130 and a rectifier module 140;

[0041] The first end and the second end of the sampling module 120 are connected to the power grid L, the third end, the fourth end and the fifth end of the sampling module 120 are connected to the control module 110, the first end and the second end of the rectifier module 140 are connected to the power grid L, the third end of the rectifier module 140, the fourth end of the sampling module 120, the first end of the power feedback control module 130, the fourth end of the rectifier module 140, the fifth end of the rectifier module 140, the fifth end of the sampling module 120, the second end of the power feedback control module 130, and the sixth end of the rectifier module 140 are connected to the drive bus C, the seventh end of the rectifier module 140 is connected to the single-phase AC device 200, the third end and the fourth end of the power feedback control module 130 are connected to the power grid L, and the fifth end and the sixth end of the power feedback control module 130 are connected to the control module 110;

[0042] The sampling module 120 is used to collect the grid voltage phase of the grid L and the driving voltage of the driving bus C; the rectifier module 140 is used to rectify the grid power transmitted by the grid L and the driving power transmitted by the driving bus C, the control module 110 is used to generate a feedback control signal according to the grid voltage phase and the driving voltage, and the power feedback control module 130 is used to output the driving power to the grid L according to the feedback control signal.

[0043] Specifically, the power grid L includes a first power grid line L1 and a second power grid line L2, and the driving bus C includes a first driving bus C1 and a second driving bus C2. Specifically, the first end of the acquisition module and the first end of the rectifier module 140 are both connected to the first power grid line L1, the second end of the acquisition module and the second end of the rectifier module 140 are both connected to the second power grid line L2, the third end of the rectifier module 140, the fourth end of the acquisition module, the first end of the power feedback control module 130, and the fourth end of the rectifier module 140 are all connected to the first driving bus C1, the fifth end of the rectifier module 140, the fifth end of the sampling module 120, the second end of the power feedback control module 130, and the sixth end of the rectifier module 140 are all connected to the second driving bus C2, the third end of the power feedback control module 130 is connected to the first power grid line L1, and the fourth end of the power feedback control module 130 is connected to the second power grid line L2.

[0044] Among them, the single-phase AC device 200 includes a motor. When the motor is braking and decelerating, the back electromotive force will increase sharply, thereby causing the voltage of the driving bus C to rise transiently. In order to reduce the voltage of the driving bus C, the energy feedback circuit of the single-phase AC device provided in this solution can be used to connect the driving bus C and the power grid L, so that the driving power can be output to the power grid L, thereby achieving the purpose of energy saving.

[0045] The sampling module 120 can monitor the grid voltage phase change of the grid L and the driving voltage change of the driving bus C in real time. The rectifier module 140 can convert the AC power input from the grid L into DC power, or convert the DC power input from the driving bus C into AC power. The control module 110 is the control center of the energy feedback circuit of the entire single-phase AC device. It can control the power feedback control module 130 under certain conditions based on the data fed back by the sampling module 120 (for example, the grid voltage phase of the grid L and the driving voltage of the driving bus C) to control the driving power output to the grid L. The control module 110 includes a control chip with data processing function such as a single-chip microcomputer. The power feedback control module 130 is a control switch that conducts the connection loop between the driving bus C and the grid L. It can conduct the connection loop between the driving bus C and the grid L under certain conditions to enable the driving power to be output to the grid L.

[0046] According to the above connection relationship, the working principle of the energy feedback circuit of the single-phase AC device is as follows: the sampling module 120 can collect the grid voltage phase of the power grid L and the driving voltage of the driving bus C in real time, and transmit the grid voltage phase and the driving voltage to the control module 110. The control module 110 can monitor the change of the grid voltage phase in real time, monitor the change of the driving voltage and the change of the driving voltage in real time, so as to generate a feedback control signal when the grid voltage phase is in a specific range and the driving voltage is greater than a specific threshold (indicating that the single-phase AC device 200 is braked). The power feedback control module 130 conducts the driving bus C and the grid L connection loop according to the feedback control signal to output the driving power to the grid L.

[0047] The energy feedback circuit of the single-phase AC device provided in the embodiment of the utility model collects the grid voltage phase of the grid L and the driving voltage of the driving bus C through the sampling module 120, the control module 110 generates a feedback control signal according to the grid voltage phase and the driving voltage, and the power feedback control module 130 outputs the driving electric energy to the grid L according to the feedback control signal. Therefore, when the grid voltage phase is in a specific range and the driving voltage is greater than a specific threshold (the single-phase AC device 200 is braked), the driving bus C and the grid L can be connected to output the driving electric energy to the grid L, thereby reducing the voltage of the driving bus C. Compared with the prior art that achieves the purpose of reducing the voltage of the driving bus C through resistance energy consumption, the energy feedback circuit of the single-phase AC device provided in the embodiment of the utility model can quickly reduce the voltage of the driving bus C, thereby accelerating the braking speed and saving braking electric energy.

[0048] Based on the above embodiment, optionally, Figure 2 A schematic diagram of the structure of another energy feedback circuit of a single-phase AC device provided by an embodiment of the utility model, such as Figure 2 The power feedback control module 130 shown includes a first power feedback control unit 131 and a second power feedback control unit 132; the first end of the first power feedback control unit 131 serves as the first end of the power feedback control module 130, the second end of the first power feedback control unit 131 serves as the third end of the power feedback control module 130, and the control end of the first power feedback control unit 131 serves as the fifth end of the power feedback control module 130; the first end of the second power feedback control unit 132 serves as the second end of the power feedback control module 130, the second end of the second power feedback control unit 132 serves as the fourth end of the power feedback control module 130, and the control end of the second power feedback control unit 132 serves as the sixth end of the power feedback control module 130.

[0049] Specifically, a first end of the first power feedback control unit 131 is connected to the first drive bus C1, a second end of the first power feedback control unit 131 is connected to the first grid line L1, and a control end of the first power feedback control unit 131 is connected to the control module 110; a first end of the second power feedback control unit 132 is connected to the second drive bus C2, a second end of the second power feedback control unit 132 is connected to the second grid line L2, and a control end of the second power feedback control unit 132 is connected to the control module 110.

[0050] Based on the above embodiment, optionally, continue to refer to Figure 2 , the first power feedback control unit 131 includes a first transistor T1, and the second power feedback control unit 132 includes a second transistor T2;

[0051] The first electrode of the first transistor T1 serves as the first end of the first power feedback control unit 131, the second electrode of the first transistor T1 serves as the second end of the first power feedback control unit 131, and the control end of the first transistor T1 serves as the control end of the first power feedback control unit 131; the first electrode of the second transistor T2 serves as the first end of the second power feedback control unit 132, the second electrode of the second transistor T2 serves as the second end of the second power feedback control unit 132, and the control end of the second transistor T2 serves as the control end of the second power feedback control unit 132.

[0052] The control module 110 can control the first and second electrodes of the first transistor T1 to be turned on by sending a feedback control signal to the control end of the first transistor T1, and the control module 110 can control the first and second electrodes of the second transistor T2 to be turned on by sending a feedback control signal to the control end of the second transistor T2. Thus, when the first transistor T1 and the second transistor T2 are turned on, the driving bus C and the power grid L can be connected to output the driving power to the power grid L.

[0053] Figure 3 The utility model provides a curve of the change of the grid voltage when a single-phase AC device is braked, such as Figure 3 As shown, the grid voltage amplitude when the grid voltage phase is positive is greater than the grid voltage amplitude when the grid voltage phase is negative. In the time region when the grid voltage phase is positive, the first transistor T1 and the second transistor T2 are turned on, driving electric energy to be output to the grid L, so that the grid voltage increases. In the time region when the grid voltage phase is negative, the first transistor T1 and the second transistor T2 are not turned on, driving electric energy cannot be output to the grid L, and the grid voltage does not change at this time.

[0054] It should be noted that: the control module 110 can control the duty cycle of the conduction signal of the first transistor T1 and the second transistor T2 to output the driving power to the power grid L according to actual conditions, thereby controlling the amplitude of the power grid voltage after the power grid L obtains the driving power, so as to ensure that the power grid voltage amplitude does not exceed the range value of 220V+15% required by the AC power fluctuation.

[0055] Based on the above embodiment, optionally, continue to refer to Figure 2 , the sampling module 120 includes a first acquisition unit 121 and a second acquisition unit 122;

[0056] The first end of the first acquisition unit 121 serves as the first end of the sampling module 120, the second end of the first acquisition unit 121 serves as the second end of the sampling module 120, and the third end of the first acquisition unit 121 serves as the third end of the sampling module 120. The first acquisition unit 121 is used to acquire the grid voltage phase of the grid L;

[0057] The first end of the second acquisition unit 122 serves as the fourth end of the sampling module 120 , and the second end of the second acquisition unit 122 serves as the fifth end of the sampling module 120 . The second acquisition unit 122 is used to acquire the driving voltage of the driving bus C.

[0058] Specifically, a first end of the first acquisition unit 121 is connected to the first grid line L1, a second end of the first acquisition unit 121 is connected to the second grid line L2, and a third end of the first acquisition unit 121 is connected to the control module 110; a first end of the second acquisition unit 122 is connected to the first drive bus C1, and a second end of the second acquisition unit 122 is connected to the second drive bus C2.

[0059] Specifically, continue to refer to Figure 2 , the first acquisition unit 121 includes a phase-locked loop 1211, and the second acquisition unit 122 includes a first capacitor C1;

[0060] The first end of the phase-locked loop 1211 serves as the first end of the first acquisition unit 121, the second end of the phase-locked loop 1211 serves as the second end of the first acquisition unit 121, and the third end of the phase-locked loop 1211 serves as the third end of the first acquisition unit 121; the first electrode of the first capacitor C1 serves as the first end of the second acquisition unit 122, and the second electrode of the first capacitor C1 serves as the second end of the second acquisition unit 122.

[0061] The phase-locked loop 1211 is a negative feedback control system that uses the voltage generated by phase synchronization to tune the voltage-controlled oscillator to generate the target frequency. The frequency and phase of the oscillation signal inside the loop can be controlled by an external reference signal to achieve automatic tracking of the output signal frequency to the input signal frequency. The first capacitor C1 has the function of energy storage, and the control module 110 can collect the driving voltage of the driving bus C by detecting the voltage across the first capacitor C1.

[0062] Based on the above embodiment, optionally, continue to refer to Figure 2 , the rectifier module 140 includes a first rectifier unit 141 and a second rectifier unit 142;

[0063] The first end of the first rectifier unit 141 serves as the first end of the rectifier module 140, the second end of the first rectifier unit 141 serves as the second end of the rectifier module 140, the third end of the first rectifier unit 141 serves as the third end of the rectifier module 140, and the fourth end of the first rectifier unit 141 serves as the fifth end of the rectifier module 140;

[0064] The first end of the second rectifier unit 142 serves as the fourth end of the rectifier module 140 , the second end of the second rectifier unit 142 serves as the sixth end of the rectifier module 140 , and the third end of the second rectifier unit 142 serves as the seventh end of the rectifier module 140 .

[0065] The first rectifying unit 141 can rectify the AC power outputted from the power grid L into DC power and output it to the driving bus C. The second rectifying unit 142 can invert the DC power outputted from the driving bus C into AC power and provide it to the motor M.

[0066] Specifically, the first rectifying unit 141 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4;

[0067] The anode of the first diode D1 and the cathode of the second diode D2 are connected and serve as the first end of the first rectifying unit 141, the anode of the third diode D3 and the cathode of the fourth diode D4 are connected and serve as the second end of the first rectifying unit 141, the cathode of the first diode D1 and the cathode of the third diode D3 are connected and serve as the third end of the first rectifying unit 141, and the anode of the second diode D2 and the anode of the fourth diode D4 are connected and serve as the fourth end of the first rectifying unit 141;

[0068] The second rectifying unit 142 includes an inverter 1421;

[0069] The first end of the inverter 1421 serves as the first end of the second rectifying unit 142 , and the second end of the inverter 1421 serves as the second end of the second rectifying unit 142 .

[0070] Specifically, when the first grid line L1 is positive and the second grid line L2 is negative, the current flowing into the first grid line L1 flows into the first drive bus C1 through the first diode D1, and the current of the second drive bus C2 flows back to the second grid line L2 through the fourth diode D4; when the first grid line L1 is negative and the second grid line L2 is positive, the current flowing into the second grid line L2 flows into the first drive bus C1 through the third diode D3, and the current of the second drive bus C2 flows back to the second grid line L2 through the second diode D2.

[0071] It should be noted that the above embodiment is only an exemplary circuit structure of the first rectifying unit 141, and this solution does not make any specific limitation on this.

[0072] Based on the above embodiment, optionally, Figure 4 This is a schematic diagram of the structure of another energy feedback circuit of a single-phase AC device provided by an embodiment of the utility model. Figure 4 As shown, the energy feedback circuit of the single-phase AC device further includes a filter module 150;

[0073] The first and second ends of the filter module 150 are connected to the power grid L, and the third end of the filter module 150 is connected to the third end of the power feedback control module 130 ; the filter module 150 is used to filter the driving power.

[0074] Specifically, the filter module 150 includes an inductor R and a second capacitor C2;

[0075] The first end of the inductor R is connected to the first end of the second capacitor C2 and serves as the first end of the filter module 150 . The second end of the second capacitor C2 serves as the second end of the filter module 150 . The second end of the inductor R serves as the third end of the filter module 150 .

[0076] The inductor R and the second capacitor C2 form an LC filter, which can filter out high-order harmonics mixed in the driving power transmitted by the driving bus C to prevent the driving power output to the power grid L from having an adverse effect on the power transmitted by the power grid L.

[0077] An embodiment of the utility model further provides a driver, which includes the energy feedback circuit of the single-phase AC device provided by any embodiment of the utility model, and thus has the beneficial effects of the energy feedback circuit of the single-phase AC device provided by any embodiment of the utility model, which will not be repeated here.

[0078] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0079] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An energy feedback circuit for a single-phase AC device, characterized in that: It includes a control module, a sampling module, an electric energy feedback control module and a rectifier module; The first end and the second end of the sampling module are both connected to the power grid, the third end, the fourth end and the fifth end of the sampling module are all connected to the control module, the first end and the second end of the rectifier module are both connected to the power grid, the third end of the rectifier module, the fourth end of the sampling module, the first end of the power feedback control module, the fourth end of the rectifier module, the fifth end of the rectifier module, the fifth end of the sampling module, the second end of the power feedback control module, and the sixth end of the rectifier module are all connected to the drive bus, the seventh end of the rectifier module is connected to the single-phase AC device, the third end and the fourth end of the power feedback control module are both connected to the power grid, and the fifth end and the sixth end of the power feedback control module are both connected to the control module; The sampling module is used to collect the grid voltage phase of the grid and the driving voltage of the driving bus; the rectifying module is used to rectify the grid power transmitted by the grid and the driving power transmitted by the driving bus; the control module is used to generate a feedback control signal according to the grid voltage phase and the driving voltage; the power feedback control module is used to output the driving power to the grid according to the feedback control signal.

2. The energy feedback circuit of the single-phase AC device according to claim 1, characterized in that: The power feedback control module includes a first power feedback control unit and a second power feedback control unit; The first end of the first power feedback control unit serves as the first end of the power feedback control module, the second end of the first power feedback control unit serves as the third end of the power feedback control module, and the control end of the first power feedback control unit serves as the fifth end of the power feedback control module; The first end of the second power feedback control unit serves as the second end of the power feedback control module, the second end of the second power feedback control unit serves as the fourth end of the power feedback control module, and the control end of the second power feedback control unit serves as the sixth end of the power feedback control module.

3. The energy feedback circuit of the single-phase AC device according to claim 2, characterized in that: The first power feedback control unit includes a first transistor, and the second power feedback control unit includes a second transistor; The first electrode of the first transistor serves as the first end of the first power feedback control unit, the second electrode of the first transistor serves as the second end of the first power feedback control unit, and the control end of the first transistor serves as the control end of the first power feedback control unit; The first electrode of the second transistor serves as the first end of the second power feedback control unit, the second electrode of the second transistor serves as the second end of the second power feedback control unit, and the control end of the second transistor serves as the control end of the second power feedback control unit.

4. The energy feedback circuit of the single-phase AC device according to claim 1, characterized in that: The sampling module includes a first acquisition unit and a second acquisition unit; The first end of the first acquisition unit serves as the first end of the sampling module, the second end of the first acquisition unit serves as the second end of the sampling module, the third end of the first acquisition unit serves as the third end of the sampling module, and the first acquisition unit is used to acquire the grid voltage phase of the grid; The first end of the second acquisition unit serves as the fourth end of the sampling module, the second end of the second acquisition unit serves as the fifth end of the sampling module, and the second acquisition unit is used to acquire the driving voltage of the driving bus.

5. The energy feedback circuit of the single-phase AC device according to claim 4, characterized in that: The first acquisition unit includes a phase-locked loop, and the second acquisition unit includes a first capacitor; The first end of the phase-locked loop serves as the first end of the first acquisition unit, the second end of the phase-locked loop serves as the second end of the first acquisition unit, and the third end of the phase-locked loop serves as the third end of the first acquisition unit; The first electrode of the first capacitor serves as the first end of the second acquisition unit, and the second electrode of the first capacitor serves as the second end of the second acquisition unit.

6. The energy feedback circuit of the single-phase AC device according to claim 1, characterized in that: The rectifier module includes a first rectifier unit and a second rectifier unit; The first end of the first rectifier unit serves as the first end of the rectifier module, the second end of the first rectifier unit serves as the second end of the rectifier module, the third end of the first rectifier unit serves as the third end of the rectifier module, and the fourth end of the first rectifier unit serves as the fifth end of the rectifier module; The first end of the second rectifier unit serves as the fourth end of the rectifier module, the second end of the second rectifier unit serves as the sixth end of the rectifier module, and the third end of the second rectifier unit serves as the seventh end of the rectifier module.

7. The energy feedback circuit of the single-phase AC device according to claim 6, characterized in that: The first rectifying unit includes a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode is connected to the cathode of the second diode and serves as the first end of the first rectifying unit, the anode of the third diode is connected to the cathode of the fourth diode and serves as the second end of the first rectifying unit, the cathode of the first diode is connected to the cathode of the third diode and serves as the third end of the first rectifying unit, and the anode of the second diode is connected to the anode of the fourth diode and serves as the fourth end of the first rectifying unit; The second rectifying unit comprises an inverter; The first end of the inverter serves as the first end of the second rectifying unit, and the second end of the inverter serves as the second end of the second rectifying unit.

8. The energy feedback circuit of the single-phase AC device according to claim 1, characterized in that: Also includes a filtering module; The first end and the second end of the filter module are connected to the power grid, and the third end of the filter module is connected to the third end of the power feedback control module; The filtering module is used to filter the driving electric energy.

9. The energy feedback circuit of the single-phase AC device according to claim 8, characterized in that: The filtering module includes an inductor and a second capacitor; The first end of the inductor is connected to the first end of the second capacitor and serves as the first end of the filter module, the second end of the second capacitor serves as the second end of the filter module, and the second end of the inductor serves as the third end of the filter module.

10. A driver, characterized in that: An energy feedback circuit comprising a single-phase AC device as described in any one of claims 1-9.

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