Power supply circuit and refrigeration equipment

Abstract

The utility model provides a power supply circuit and refrigeration equipment, and relates to the technical field of refrigeration equipment, and the power supply circuit comprises a Swiss conversion circuit which is used for outputting a DC bus voltage; the frequency converter is used for inverting the direct-current bus voltage and then outputting the direct-current bus voltage to a motor load; the energy absorption circuit is electrically connected with the output end of the conversion circuit; the energy discharge circuit is electrically connected with the output end of the conversion circuit; and the control circuit is electrically connected with the Swiss conversion circuit and the energy discharge circuit respectively, and the control circuit is used for outputting a corresponding control signal to the Swiss conversion circuit and the energy discharge circuit according to the DC bus voltage. According to the invention, the stable control of the DC bus voltage is realized, the back electromotive force of the motor load is prevented from damaging the post-stage equipment, the overhigh pumping voltage of the bus during the braking of the motor load can be effectively inhibited, and the energy impact on the thin-film capacitor and the post-stage switching device is reduced, thereby improving the stability and reliability of the whole power supply circuit.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and particularly to a power supply circuit and a refrigeration equipment. Background Art

[0002] During the high-speed operation of a driving motor, if there is a sudden drop or stop in the rotational speed, the generated regenerative energy will be reversely transmitted to the bus filter capacitor. For a three-phase Swiss rectifier circuit topology without electrolytic capacitors, the filter capacitor connected to its output end is a DC thin-film capacitor. Due to the limited capacity of the thin-film capacitor, an excessive pump-up voltage may damage the subsequent switching devices or the motor. Summary of the Utility Model

[0003] The main object of the present utility model is to provide a power supply circuit, aiming to suppress the excessive pump-up voltage of the bus during the braking of the driving motor and reduce the energy impact on the thin-film capacitor and the subsequent switching devices.

[0004] To achieve the above object, the present utility model provides a power supply circuit, which includes:

[0005] A Swiss conversion circuit, which is used to output a DC bus voltage;

[0006] An inverter, which is used to invert the DC bus voltage and output it to the motor load;

[0007] An energy absorption circuit, which is electrically connected to the output end of the conversion circuit;

[0008] An energy discharge circuit, which is electrically connected to the output end of the conversion circuit; and

[0009] A control circuit, which is electrically connected to the Swiss conversion circuit and the energy discharge circuit respectively. The control circuit is used to output corresponding control signals to the Swiss conversion circuit and the energy discharge circuit according to the DC bus voltage.

[0010] Optionally, the energy absorption circuit includes:

[0011] A capacitor absorption circuit, the input end of which is connected to the output end of the Swiss conversion circuit. The capacitor absorption circuit is used to absorb the back electromotive force of the motor load when the output of the Swiss conversion circuit is cut off;

[0012] A discharge circuit, the input end of which is connected to the output end of the capacitor absorption circuit. The discharge circuit is used to discharge the back electromotive force absorbed by the capacitor absorption circuit.

[0013] Optionally, the capacitor absorption circuit includes:

[0014] A first resistor, with the first end of the first resistor connected to the first output end of the Swiss transformation circuit;

[0015] A first capacitor, with the second end of the first capacitor connected to the second output end of the Swiss transformation circuit. A first diode is connected in series between the first end of the first capacitor and the second end of the first resistor, and both ends of the first capacitor are connected to the load.

[0016] Optionally, the energy dissipation circuit includes:

[0017] A resistor dissipation circuit, with the input end of the resistor dissipation circuit connected to the output end of the Swiss transformation circuit;

[0018] A switch circuit, with the controlled end of the switch circuit connected to the output end of the control circuit. The first conduction end of the switch circuit is connected to the output end of the resistor dissipation circuit, and the second conduction end of the switch circuit is connected to the second output end of the Swiss transformation circuit;

[0019] The control circuit is configured to control the switch circuit to conduct according to the control signal to dissipate the back electromotive force of the motor load.

[0020] Optionally, the resistor dissipation circuit includes:

[0021] A second resistor, with the first end of the second resistor connected to the first output end of the Swiss transformation circuit, and a second diode connected in parallel across both ends of the second resistor.

[0022] Optionally, the switch circuit includes:

[0023] A first switching tube, with the first conduction end of the first switching tube connected to the second end of the second resistor, and the second conduction end of the first switching tube connected to the second output end of the Swiss transformation circuit.

[0024] Optionally, the control circuit includes:

[0025] A detection circuit, with the input end of the detection circuit connected to the output end of the Swiss transformation circuit. The detection circuit is configured to detect the amplitude of the bus voltage and output a corresponding voltage signal;

[0026] A main controller, with the input end of the main controller connected to the output end of the detection circuit. The main controller is configured to output a corresponding control signal according to the voltage signal;

[0027] A drive circuit, the input terminals of the drive circuit are electrically connected to the detection circuit and the main controller respectively, and the output terminals of the drive circuit are electrically connected to the Swiss conversion circuit and the energy discharge circuit respectively;

[0028] The drive circuit is used to drive the Swiss conversion circuit to turn off and / or the energy discharge circuit to turn on according to the control signal.

[0029] Optionally, the power supply circuit further includes:

[0030] A thin-film capacitor, the thin-film capacitor is arranged in parallel with the output terminal of the Swiss conversion circuit; the thin-film capacitor is used to filter the DC bus voltage.

[0031] In addition, to achieve the above object, the present invention also provides a refrigeration device, and the refrigeration device includes the power supply circuit as described above.

[0032] Optionally, the refrigeration device is an air conditioner.

[0033] In the embodiment of the present invention, a Swiss conversion circuit is provided to convert an AC voltage into a DC bus voltage, then an inverter is provided to invert the DC bus voltage and output it to the motor load, and an energy absorption circuit and an energy discharge circuit are respectively electrically connected to the output terminal of the Swiss conversion circuit. Finally, a control circuit is provided to detect the DC bus voltage and output a corresponding control signal to the Swiss conversion circuit and the energy discharge circuit to discharge the back electromotive force of the motor load, thereby realizing stable control of the DC bus voltage, avoiding damage to the subsequent equipment caused by the back electromotive force of the motor load, effectively suppressing the excessive pump-up voltage of the bus when the motor load brakes, reducing the energy impact on the thin-film capacitor and the subsequent switching devices, and thus improving the stability and reliability of the entire power supply circuit. Description of the Drawings

[0034] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a circuit block diagram of the power supply circuit according to an embodiment of the present invention;

[0037] Figure 2 Circuit block diagram of the power supply circuit according to another embodiment of the present utility model;

[0038] Figure 3 Circuit block diagram of the power supply circuit according to yet another embodiment of the present utility model;

[0039] Figure 4 Circuit block diagram of the power supply circuit according to still another embodiment of the present utility model;

[0040] Figure 5 Circuit block diagram of the power supply circuit according to still another embodiment of the present utility model;

[0041] Figure 6 Circuit schematic diagram of the power supply circuit of the present utility model.

[0042] Explanation of the reference numerals in the attached drawings:

[0043] Label Name Label Name 10 Swiss transformation circuit 42 Switching circuit 20 Frequency converter 50 Control circuit 30 Energy absorption circuit 51 Detection circuit 31 Capacitor absorption circuit 52 Main controller 32 Discharge circuit 53 Drive circuit 40 Energy release circuit 60 Film capacitor 41 Resistor release circuit - -

[0044] The realization of the object, functional features and advantages of the present utility model will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Well-known modules, units and their connections, links, communications or operations therebetween are not shown or not described in detail. And the described features, architectures or functions can be combined in any way in one or more embodiments. Those skilled in the art should understand that the following various embodiments are only used for illustration, rather than for limiting the protection scope of the present utility model. It can also be easily understood that the modules, units or processing methods in the various embodiments described herein and shown in the attached drawings can be combined and designed in various different configurations. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0046] For the definitions of various nouns or methods referred to in the following embodiments, unless it is logically impossible, the nouns or methods generally refer to the broad concepts that can be implemented on the premise of the content disclosed in the embodiments. Under such an understanding, all specific lower-level specific definitions of the nouns or methods shall be regarded as the content of the present invention, and should not be narrowly understood or prejudicially interpreted on the grounds that the specific definition is not disclosed in the specification. Similarly, on the premise that it can be logically realized, the order of the steps in the method is flexible and changeable, and the specific lower-level specific definitions in the broad concepts of various nouns or methods all fall within the protection scope of the present invention.

[0047] The main solution of the embodiment of this application is: by providing a Swiss conversion circuit for converting an AC voltage into a DC bus voltage, then providing an inverter to invert the DC bus voltage and output it to the motor load, and providing an energy absorption circuit and an energy discharge circuit respectively electrically connected to the output end of the Swiss conversion circuit, and finally providing a control circuit for detecting the DC bus voltage and outputting a corresponding control signal to the Swiss conversion circuit and the energy discharge circuit to discharge the back electromotive force of the motor load.

[0048] For the existing technology of the three-phase Swiss rectifier circuit topology without electrolytic capacitors, the filter capacitor connected to its output end is a DC film capacitor. Due to the limited capacitance of the film capacitor, too high a pump-up voltage may damage the subsequent switching devices or the motor.

[0049] This application provides a solution to achieve stable control of the bus voltage, avoid damage to the subsequent equipment caused by the back electromotive force of the motor load, effectively suppress the excessive pump-up voltage of the bus during the braking of the motor load, reduce the energy impact on the film capacitor and the subsequent switching devices, thereby improving the stability and reliability of the entire power supply circuit.

[0050] Refer to Figure 1 , in an embodiment of the present invention, the power supply circuit includes a Swiss conversion circuit 10, an inverter 20, an energy absorption circuit 30, an energy discharge circuit 40, and a control circuit 50, where:

[0051] The Swiss conversion circuit 10 is used to output a DC bus voltage; the inverter 20 is used to invert the DC bus voltage and output it to the motor load; the energy absorption circuit 30 is electrically connected to the output end of the conversion circuit; the energy discharge circuit 40 is electrically connected to the output end of the conversion circuit; and the control circuit 50 is electrically connected to the Swiss conversion circuit 10 and the energy discharge circuit 40 respectively; the control circuit 50 is used to output a corresponding control signal to the Swiss conversion circuit 10 and the energy discharge circuit 40 according to the DC bus voltage.

[0052] In this embodiment, the Swiss transformation circuit 10 is a buck-type power factor correction circuit, which has advantages such as operating at unity power, low switching loss, low current harmonic distortion rate, and fully adjustable voltage. By providing the Swiss transformation circuit 10 to output the DC bus voltage to the frequency converter 20, the frequency converter 20 inverts the DC bus voltage and outputs it to the motor load, thereby achieving efficient drive of the motor.

[0053] Among them, the energy absorption circuit 30 can be composed of energy storage elements such as capacitors and inductors, and is used to absorb the back electromotive force of the motor load to reduce the impact on the circuit. The energy discharge circuit 40 can be composed of energy-consuming elements such as resistors and switching elements, and is used to discharge the back electromotive force when the motor load brakes, avoiding too high bus voltage, and thus avoiding damage to the subsequent equipment. The control circuit 50 detects the DC bus voltage and adjusts the working states of the Swiss transformation circuit 10 and the energy discharge circuit 40 in real time to ensure the stable operation of the circuit.

[0054] In this embodiment, by providing the Swiss transformation circuit 10 for converting the AC voltage into the DC bus voltage, then providing the frequency converter 20 to invert the DC bus voltage and output it to the motor load, and providing the energy absorption circuit 30 and the energy discharge circuit 40 to be electrically connected to the output end of the Swiss transformation circuit 10 respectively, and finally providing the control circuit 50 for detecting the DC bus voltage and outputting corresponding control signals to the Swiss transformation circuit 10 and the energy discharge circuit 40 to discharge the back electromotive force of the motor load, thereby achieving stable control of the DC bus voltage, avoiding damage to the subsequent equipment caused by the back electromotive force of the motor load, effectively suppressing the excessive pump-up voltage of the bus during motor load braking, reducing the energy impact on the film capacitor 60 and the subsequent switching devices, and thus improving the stability and reliability of the entire power supply circuit.

[0055] Optionally, referring to Figure 2 , another embodiment of the present invention provides a power supply circuit. Based on the above Figure 1 shown embodiment, the energy absorption circuit 30 includes a capacitor absorption circuit 31 and a discharge circuit 32, where:

[0056] The input end of the capacitor absorption circuit 31 is connected to the output end of the Swiss transformation circuit 10, and the capacitor absorption circuit 31 is used to absorb the back electromotive force of the motor load when the output of the Swiss transformation circuit 10 is cut off; the input end of the discharge circuit 32 is connected to the output end of the capacitor absorption circuit 31, and the discharge circuit 32 is used to discharge the back electromotive force absorbed by the capacitor absorption circuit 31.

[0057] In this embodiment, the capacitor absorption circuit 31 can adopt small-capacity electrolytic capacitors or energy storage inductors to ensure that the back electromotive force of the motor load can be quickly absorbed and the bus voltage can be stabilized during the braking process. Among them, the electrolytic capacitors have a large capacitance and a low internal resistance, and these electrolytic capacitors have a high efficiency when absorbing braking energy.

[0058] The design of the capacitor absorption circuit 31 can include multiple capacitor units connected in series or in parallel to improve the overall absorption capacity. Each capacitor unit can be composed of multiple small-capacity electrolytic capacitors connected in series to achieve the required withstand voltage level. During the braking process, when the output of the Swiss transformation circuit 10 is cut off, the capacitor absorption circuit 31 starts to work and absorbs the bus voltage exceeding the set voltage threshold. Due to the energy storage characteristic of the capacitor, the absorption circuit can absorb a large amount of energy at the moment when the braking energy is released, thereby protecting the subsequent devices, such as step-down switching devices, from overvoltage damage.

[0059] The discharge circuit 32 can be composed of multiple discharge elements, such as resistors, thyristors, transistors, or relays, etc., to achieve the rapid release of the energy stored in the capacitor absorption circuit 31. The design of the discharge circuit 32 needs to ensure that it can respond quickly during the braking process to avoid damage to the capacitor elements due to excessive voltage in the capacitor absorption circuit 31.

[0060] Optionally, referring to Figure 6 In another embodiment of the present invention, a power supply circuit is provided. Based on the above Figure 2 shown embodiment, the capacitor absorption circuit 31 includes a first resistor R2 and a first capacitor E2, where:

[0061] The first end of the first resistor R2 is connected to the first output end of the Swiss transformation circuit 10; the second end of the first capacitor E2 is connected to the second output end of the Swiss transformation circuit 10, and a first diode D2 is connected in series between the first end of the first capacitor E2 and the second end of the first resistor R2, and both ends of the first capacitor E2 are connected to the load.

[0062] In this embodiment, the first diode D2 is used to prevent the capacitor from discharging when the transformation circuit is working normally, ensuring that the capacitor only absorbs the energy exceeding the set voltage threshold during the braking process. The function of the first resistor R2 is to limit the current when the capacitor is charging to avoid damage to the capacitor caused by excessive current impact. By reasonably designing the parameters of the first resistor R2 and the first capacitor E2, it can be ensured that the capacitor absorption circuit 31 can respond quickly at the moment when the braking energy is released, effectively absorb the excess energy, and after the absorption is completed, release the energy to the subsequent load to ensure that the capacitor can quickly return to the standby state after the braking ends and be ready for the next braking.

[0063] Optionally, referring toFigure 3 , Another embodiment of the present utility model provides a power supply circuit. Based on the above Figure 1 shown embodiment, the energy discharge circuit 40 includes a resistor discharge circuit 41 and a switch circuit 42, wherein:

[0064] The input end of the resistor discharge circuit 41 is connected to the output end of the Swiss conversion circuit 10; the controlled end of the switch circuit 42 is connected to the output end of the control circuit 50, the first conduction end of the switch circuit 42 is connected to the output end of the resistor discharge circuit 41, and the second conduction end of the switch circuit 42 is connected to the second output end of the Swiss conversion circuit 10; the control circuit 50 is configured to control the switch circuit 42 to conduct according to the control signal to discharge the back electromotive force of the motor load.

[0065] In this embodiment, the resistor discharge circuit 41 can adopt a high-power resistor or a resistor network to ensure that the back electromotive force can be effectively discharged during the braking process and avoid too high a bus voltage. The design of the resistor discharge circuit 41 also needs to consider the power bearing capacity and thermal management of the resistor to ensure that it will not be damaged due to overheating during long-term operation.

[0066] Among them, if the resistor discharge circuit 41 adopts a resistor network, it can include a plurality of resistor units connected in parallel to improve the overall discharge capacity. Each resistor unit can be composed of a plurality of high-power resistors connected in parallel to achieve the required discharge power. By reasonably designing the parameters of the resistor discharge circuit 41, it can be ensured that a quick response is achieved at the moment of braking energy release, and the excess energy is effectively discharged, thereby protecting the subsequent equipment from overvoltage damage.

[0067] The switch circuit 42 can be composed of semiconductor switch elements such as power transistors, MOSFETs or IGBTs to achieve fast control of the discharge circuit. The control circuit 50 adjusts the conduction state of the switch circuit 42 in real time by detecting the DC bus voltage to ensure that the back electromotive force is discharged in time during the braking process and at the same time avoid damaging the subsequent equipment.

[0068] Optionally, referring to Figure 6 , Another embodiment of the present utility model provides a power supply circuit. Based on the above Figure 3 shown embodiment, the resistor discharge circuit 41 includes a second resistor R1, wherein:

[0069] The first end of the second resistor R1 is connected to the first output end of the Swiss conversion circuit 10, and a second diode D1 is connected in parallel across both ends of the second resistor R1.

[0070] In this embodiment, the function of the second diode D1 is to prevent current from flowing back through the second resistor R1R3 when the Swiss transformation circuit 10 is operating normally, thereby ensuring that the resistor only discharges the back electromotive force during the braking process. The resistance value of the second resistor R1R3 needs to be selected according to the maximum back electromotive force that may be generated during the braking process and the allowed discharge current, so as to ensure that the excess energy can be effectively discharged at the moment of braking energy release, thereby avoiding damage to the subsequent equipment.

[0071] In this embodiment, the second resistor R1R3 can adopt a high-power resistor to ensure that the back electromotive force can be effectively discharged during the braking process and avoid too high a bus voltage. The design of the resistor discharge circuit 41 also needs to consider the power tolerance and thermal management of the resistor to ensure that it will not be damaged due to overheating during long-term operation. By reasonably designing the parameters of the resistor discharge circuit 41, it can be ensured that a quick response can be achieved at the moment of braking energy release, effectively discharging the excess energy, thereby protecting the subsequent equipment from overvoltage damage.

[0072] Optionally, referring to Figure 6 , another embodiment of the present invention provides a power supply circuit. Based on the above Figure 3 shown embodiment, the switching circuit 42 includes a first switching tube S4, where:

[0073] The first conduction end of the first switching tube S4 is connected to the second end of the second resistor R1, and the second conduction end of the first switching tube S4 is connected to the second output end of the Swiss transformation circuit 10.

[0074] In this embodiment, the controlled end of the first switching tube S4 is connected to the output end of the control circuit 50. The first switching tube S4 can be a power switching device such as a MOSFET or an IGBT, and its controlled end is driven by the control circuit 50. The control circuit 50 outputs a corresponding control signal according to the detected DC bus voltage, thereby realizing the control of the conduction or cutoff of the first switching tube S4 to ensure that the back electromotive force is discharged in time during the braking process. In addition, the selection of the first switching tube S4 needs to consider parameters such as its withstand voltage, current tolerance, and switching speed to ensure that it can work reliably in an environment of high voltage and large current.

[0075] Among them, the control circuit 50 can adopt pulse width modulation (PWM) technology to control the conduction time of the first switching tube S4. By dynamically adjusting the duty cycle of the PWM signal, the magnitude of the discharge current can be controlled, thereby realizing the regulation of the bus voltage.

[0076] Optionally, referring to Figure 4 , yet another embodiment of the present invention provides a power supply circuit. Based on the above Figures 1 to 3 or Figure 6In any of the illustrated embodiments, the control circuit 50 includes a detection circuit 51, a main controller 52, and a drive circuit 53, where:

[0077] The input end of the detection circuit 51 is connected to the output end of the Swiss transformation circuit 10. The detection circuit 51 is configured to detect the amplitude of the bus voltage and output a corresponding voltage signal. The input end of the main controller 52 is connected to the output end of the detection circuit 51. The main controller 52 is configured to output a corresponding control signal according to the voltage signal. The input ends of the drive circuit 53 are electrically connected to the detection circuit 51 and the main controller 52 respectively. The output ends of the drive circuit 53 are electrically connected to the Swiss transformation circuit 10 and the energy discharge circuit 40 respectively. The drive circuit 53 is configured to drive the Swiss transformation circuit 10 to turn off and / or the energy discharge circuit 40 to turn on according to the control signal.

[0078] In this embodiment, the detection circuit 51 is responsible for monitoring the change of the bus voltage in real time and transmitting the detected voltage signal to the main controller 52. The main controller 52 outputs corresponding control signals according to the amplitude and change trend of the voltage signal through the correspondence between the amplitude of the preset voltage signal and the control strategy. These control signals can not only guide the transformation circuit to perform accurate power conversion, but also control the conduction state of the energy discharge circuit 40 to ensure the reasonable distribution and effective management of energy during the braking process.

[0079] Among them, the main controller 52 can be implemented by an MCU (Micro controller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), an SOC (System On Chip), etc.

[0080] Among them, the detection circuit 51 can be implemented by a voltage sensor, which has the characteristics of high precision and fast response and can ensure the accuracy of the detection result. The voltage sensor can be a Hall effect sensor, a voltage divider, or other sensors suitable for high-voltage measurement. In practical applications, the selection of the voltage sensor needs to consider factors such as its measurement range, accuracy, response time, and resistance to electromagnetic interference.

[0081] Among them, the drive circuit 53 is responsible for converting the control signal of the main controller 52 into the drive signals of the conversion circuit and the energy dissipation circuit 40. The drive circuit 53 can be an isolation component, such as an optocoupler or an isolation amplifier, or a logic circuit, such as an AND gate circuit, an OR gate circuit or a NOT gate circuit, or an operational amplifier circuit or a comparison circuit, so as to achieve precise control of the conversion circuit and the energy dissipation circuit 40. The design of the drive circuit 53 needs to consider factors such as the driving ability, response speed and reliability of the circuit, so as to ensure that the conversion circuit and the energy dissipation circuit 40 can be stably driven under various working conditions.

[0082] As a bridge between the control circuit 50 and the conversion circuit and the energy dissipation circuit 40, the drive circuit 53 is responsible for converting the control signal of the main controller 52 into an actual driving action. During the braking process, the drive circuit 53 dynamically adjusts the switching state of the conversion circuit and the duty cycle of the energy dissipation circuit 40 according to the instructions of the main controller 52, so as to achieve precise control of the braking energy.

[0083] Optionally, referring to Figure 5 , another embodiment of the present utility model provides a power supply circuit. Based on the above Figure 4 shown embodiment, the power supply circuit further includes a thin film capacitor 60, wherein:

[0084] The thin film capacitor 60 is arranged in parallel with the output end of the Swiss conversion circuit 10; the thin film capacitor 60 is used for filtering the DC bus voltage.

[0085] In this embodiment, the Swiss conversion circuit 10 uses a thin film capacitor 60 to replace the original electrolytic capacitor to filter the bus voltage output by the conversion circuit, thereby significantly improving the stability and reliability of the power supply circuit. The thin film capacitor 60 has higher voltage resistance and temperature resistance characteristics, and can withstand high voltage and high temperature environments for a longer time, thereby extending the service life of the entire braking energy management system. In addition, the thin film capacitor 60 also has a lower equivalent series resistance (ESR) and equivalent series inductance (ESL), which enables it to have better performance in high-frequency applications and can more effectively filter out high-frequency noise in the bus voltage.

[0086] The present invention also proposes a refrigeration device, and the refrigeration device includes the power supply circuit as described in any of the above embodiments.

[0087] It should be noted that since the refrigeration device of the present invention is based on the above power supply circuit, therefore, the embodiments of the refrigeration device of the present invention include all the technical solutions of all the embodiments of the above power supply circuit, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0088] Optionally, the refrigeration device is an air conditioner.

[0089] It should be noted that, in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or system including such element.

[0090] The serial numbers of the above embodiments of the present utility model are only for description and do not represent the superiority or inferiority of the embodiments.

[0091] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present utility model, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions for causing a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present utility model.

[0092] The above are only the preferred embodiments of the present utility model and do not limit the patent scope of the present utility model accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: A Swiss conversion circuit for outputting a DC bus voltage; An inverter for inverting the DC bus voltage and outputting it to a motor load; An energy absorption circuit electrically connected to the output end of the conversion circuit; An energy discharge circuit electrically connected to the output end of the conversion circuit; and A control circuit electrically connected to the Swiss conversion circuit and the energy discharge circuit respectively; the control circuit is used to output corresponding control signals to the Swiss conversion circuit and the energy discharge circuit according to the DC bus voltage.

2. The power supply circuit according to claim 1, wherein The energy absorption circuit includes: A capacitor absorption circuit, the input end of the capacitor absorption circuit is connected to the output end of the Swiss conversion circuit, and the capacitor absorption circuit is used to absorb the back electromotive force of the motor load when the output of the Swiss conversion circuit is cut off; A discharge circuit, the input end of the discharge circuit is connected to the output end of the capacitor absorption circuit, and the discharge circuit is used to discharge the back electromotive force absorbed by the capacitor absorption circuit.

3. The power supply circuit according to claim 2, wherein The capacitor absorption circuit includes: A first resistor, the first end of the first resistor is connected to the first output end of the Swiss conversion circuit; A first capacitor, the second end of the first capacitor is connected to the second output end of the Swiss conversion circuit, a first diode is connected in series between the first end of the first capacitor and the second end of the first resistor, and both ends of the first capacitor are connected to the load.

4. The power supply circuit according to claim 1, wherein The energy discharge circuit includes: A resistor discharge circuit, the input end of the resistor discharge circuit is connected to the output end of the Swiss conversion circuit; A switch circuit, the controlled end of the switch circuit is connected to the output end of the control circuit, the first conducting end of the switch circuit is connected to the output end of the resistor discharge circuit, and the second conducting end of the switch circuit is connected to the second output end of the Swiss conversion circuit; The control circuit is used to control the switch circuit to conduct according to the control signal to discharge the back electromotive force of the motor load.

5. The power supply circuit according to claim 4, wherein The resistor discharge circuit includes: A second resistor, the first end of the second resistor is connected to the first output end of the Swiss conversion circuit, and a second diode is connected in parallel across both ends of the second resistor.

6. The power supply circuit according to claim 5, characterized in that The switch circuit includes: A first switch tube, the first conducting end of the first switch tube is connected to the second end of the second resistor, and the second conducting end of the first switch tube is connected to the second output end of the Swiss conversion circuit.

7. The power supply circuit according to any one of claims 1 to 6, characterized in that The control circuit includes: A detection circuit, the input end of the detection circuit is connected to the output end of the Swiss conversion circuit, and the detection circuit is used to detect the amplitude of the bus voltage and output a corresponding voltage signal; A main controller, the input end of the main controller is connected to the output end of the detection circuit, and the main controller is used to output corresponding control signals according to the voltage signal; A drive circuit, the input end of the drive circuit is electrically connected to the detection circuit and the main controller respectively, and the output end of the drive circuit is electrically connected to the Swiss conversion circuit and the energy discharge circuit respectively; The driving circuit is used to drive the Swiss transformation circuit to turn off and / or drive the energy release circuit to turn on according to the control signal.

8. The power supply circuit according to claim 7, wherein The power supply circuit further includes: A thin-film capacitor, which is arranged in parallel with the output end of the Swiss transformation circuit; the thin-film capacitor is used for filtering the DC bus voltage.

9. A refrigeration device, characterized in that, The refrigeration device includes the power supply circuit according to any one of claims 1 to 8.

10. The refrigeration device according to claim 9, characterized in that, The refrigeration device is an air conditioner.

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