Power supply circuit, bridge arm driving circuit, power unit, power module and refrigeration equipment

Abstract

The utility model discloses a power supply circuit, a bridge arm driving circuit, a power unit, a power module and refrigeration equipment. The power supply circuit is applied to a bridge arm driving circuit, the bridge arm driving circuit comprises an upper bridge arm driving circuit and a lower bridge arm driving circuit, and the power supply circuit comprises an energy storage circuit and a power supply circuit. The energy storage circuit is electrically connected with the power supply circuit, one of the energy storage circuit and the power supply circuit is used for being connected with the power supply end of the upper bridge arm driving circuit, and the other one of the energy storage circuit and the power supply circuit is used for being connected with the power supply end of the lower bridge arm driving circuit. The utility model aims to reduce the number of driving power supplies in the power module and improve the integration level of the module.

Description

Technical Field

[0001] The present application relates to the technical field of power modules, and in particular to a power supply circuit, a bridge arm driving circuit, a power unit, a power module and a refrigeration device. Background Art

[0002] In a power module, an independent driving power supply needs to be provided for each driving circuit therein, and multiple independent driving power supplies need to occupy a certain space, which is not conducive to the miniaturization design of the power module. Utility Model Content

[0003] The main purpose of the present application is to provide a power supply circuit, a bridge arm driving circuit, a power unit, a power module and a refrigeration device, aiming to reduce the number of driving power supplies in the power module and improve the integration of the module.

[0004] To achieve the above object, the present application proposes a power supply circuit, which is applied to a bridge arm driving circuit, wherein the bridge arm driving circuit includes an upper bridge arm driving circuit and a lower bridge arm driving circuit, and the power supply circuit includes:

[0005] Energy storage circuit;

[0006] A power supply circuit, the power supply circuit is used to output a driving voltage; the energy storage circuit is electrically connected to the power supply circuit;

[0007] Among them, one of the energy storage circuit and the power supply circuit is used to be connected to the power supply end of the upper bridge arm driving circuit, and the other is used to be connected to the power supply end of the lower bridge arm driving circuit.

[0008] Optionally, the energy storage circuit includes: a first capacitor.

[0009] Optionally, the power supply circuit has an output positive terminal for connecting to the positive power terminal of the upper bridge arm driving circuit and an output negative terminal for connecting to the negative power terminal of the upper bridge arm driving circuit;

[0010] The first end of the energy storage circuit is used to be connected to the positive power terminal of the lower bridge arm driving circuit, the first end of the energy storage circuit is connected to the output positive terminal of the power circuit, and the second end of the energy storage circuit is used to be connected to the negative power terminal of the lower bridge arm driving circuit.

[0011] Optionally, the power supply circuit further comprises: a current limiting circuit, the current limiting circuit being arranged in series in a path between the power supply circuit and the energy storage circuit;

[0012] Wherein, the current limiting circuit includes a current limiting resistor and / or a parasitic resistor formed by a path between the power supply circuit and the energy storage circuit.

[0013] Optionally, the power supply circuit further includes: a first unidirectional conductive circuit, the first unidirectional conductive circuit is arranged in series in a path between the power supply circuit and the energy storage circuit, an anode of the first unidirectional conductive circuit is connected to the power supply circuit, and a cathode of the first unidirectional conductive circuit is electrically connected to the energy storage circuit;

[0014] The first unidirectional conducting circuit is used for unidirectionally outputting the driving voltage output by the power supply circuit to the energy storage circuit.

[0015] The present application also proposes a bridge arm driving circuit, comprising an upper bridge arm driving circuit, a lower bridge arm driving circuit and a power supply circuit as described in any one of the above items;

[0016] Among them, one of the energy storage circuit and the power supply circuit is connected to the power supply end of the upper bridge arm driving circuit, and the other is connected to the power supply end of the lower bridge arm driving circuit.

[0017] The present application also proposes a power unit, the power unit comprising an upper bridge arm switch circuit, a lower bridge arm switch circuit and the bridge arm drive circuit as described above;

[0018] The upper bridge arm driving circuit is connected to the controlled end of the upper bridge arm switch circuit, and the lower bridge arm driving circuit is connected to the controlled end of the lower bridge arm switch circuit.

[0019] Optionally, the power supply circuit has an output positive terminal connected to the positive power terminal of the upper bridge arm driving circuit and an output negative terminal connected to the negative power terminal of the upper bridge arm driving circuit;

[0020] The power supply end of the lower bridge arm driving circuit includes a positive power supply end and a negative power supply end;

[0021] The first end of the energy storage circuit and the output positive terminal are respectively connected to the positive terminal of the power supply of the lower bridge arm driving circuit, the output negative terminal is electrically connected to the upper bridge arm switch circuit, and the second end of the energy storage circuit and the first end of the lower bridge arm switch circuit are respectively connected to the negative terminal of the power supply of the lower bridge arm driving circuit;

[0022] Wherein, when the upper bridge arm switch circuit is in the on state, the driving voltage output by the power supply circuit is output to the power supply end of the energy storage circuit and the lower bridge arm drive circuit via the bridge arm switch circuit;

[0023] When the upper bridge arm switch circuit is in an off state, the energy storage circuit outputs a first voltage to the power supply terminal of the lower bridge arm drive circuit.

[0024] Optionally, the upper bridge arm switching circuit includes a first diode device and a first switching tube, the anode of the first diode device and the output negative terminal are respectively connected to the first end of the first switching tube, and the controlled end of the first switching tube is connected to the upper bridge arm driving circuit; the first end of the upper bridge arm switching circuit includes the first end of the first diode device, and the second end of the upper bridge arm switching circuit includes the second end of the first switching tube.

[0025] Optionally, the lower bridge arm switching circuit includes a second diode device and a second switch tube, the anode of the second diode device is grounded, the second end of the second switch tube is connected to the cathode of the second diode device, the controlled end of the second switch tube is connected to the lower bridge arm driving circuit, and the second end of the energy storage circuit is connected to the first end of the second switch tube; the first end of the lower bridge arm switching circuit includes the first end of the second switch tube, and the second end of the lower bridge arm switching circuit includes the anode of the second diode device.

[0026] The present application also proposes a power module, comprising at least one power unit as described in any one of the above items.

[0027] Optionally, the power module is a step-down rectifier circuit.

[0028] The present application also proposes a power module control method for controlling any of the power modules described above, the method comprising:

[0029] Controlling the power module to operate so as to process the voltage connected to the power module and then output it;

[0030] Within a first preset time period before the upper arm switch circuit or the lower arm switch circuit corresponding to the energy storage circuit in the power unit is driven for the first time by the corresponding drive circuit, the energy storage circuit is charged and the charging action is continued for a second preset time period; wherein the second preset time period is less than the first preset time period.

[0031] Optionally, the power unit is a power unit as described in any one of the above items; and the method further includes:

[0032] The step of charging the energy storage circuit for a second preset time period before the upper bridge arm switch circuit or the lower bridge arm switch circuit corresponding to the energy storage circuit in the power unit is driven for the first time by the corresponding drive circuit specifically includes:

[0033] Within a first preset time period before the lower bridge arm switch circuit in the power unit is driven for the first time by the corresponding drive circuit, the upper bridge arm drive circuit is controlled to drive the upper bridge arm switch circuit to be in an on state and maintain it for a second preset time period.

[0034] Optionally, the method further comprises:

[0035] Within a third preset time period before the upper arm switch circuit or the lower arm switch circuit corresponding to the energy storage circuit in the power unit is driven by the corresponding drive circuit, the energy storage circuit is charged for a fourth preset time period; wherein the fourth preset time period is less than the third preset time period.

[0036] Optionally, the power unit is a power unit as described in any one of the above items; the step of charging the energy storage circuit for a fourth preset time period within a third preset time period before the upper arm switch circuit or the lower arm switch circuit corresponding to the energy storage circuit in the power unit is driven by the corresponding drive circuit specifically includes:

[0037] Acquire a multi-phase voltage connected to the power circuit;

[0038] When any phase voltage is a negative voltage, within a third preset time period before the lower bridge arm switch circuit in the power unit corresponding to the phase voltage is in the on state, the energy storage circuit in the power unit corresponding to the phase voltage is charged and lasts for a fourth preset time period.

[0039] Optionally, the method further comprises: obtaining a voltage value of the corresponding energy storage circuit within a fifth preset time period before an upper bridge arm switch circuit or a lower bridge arm switch circuit corresponding to the energy storage circuit in the power unit is driven by a corresponding drive circuit;

[0040] When the voltage value does not reach the preset threshold value, the energy storage circuit is charged for a sixth preset time period; wherein the sixth preset time period is shorter than the fifth preset time period.

[0041] Optionally, the method further comprises:

[0042] Obtaining electrical signal parameters of the output of the power module;

[0043] When it is determined according to the electrical signal parameter that the power module is in an abnormal state, controlling the power module to stop voltage processing;

[0044] The energy storage circuit in the power unit is charged.

[0045] Optionally, the electrical signal parameters include: output bus current;

[0046] When it is determined according to the electrical signal parameter that the power module is in an abnormal state, the step of controlling the power module to stop voltage processing specifically includes:

[0047] When the output bus current reaches a preset current threshold, it is determined that the power module is in an abnormal state and the power module is controlled to stop voltage processing.

[0048] Optionally, before the step of charging the energy storage circuit in the power unit, the method further includes:

[0049] Get the output bus voltage;

[0050] When the output bus current is less than a preset current threshold and the output bus voltage is greater than or equal to a preset undervoltage threshold, the step of charging the energy storage circuit in the power unit is performed.

[0051] Optionally, the electrical signal parameters include: the output bus voltage;

[0052] When it is determined according to the electrical signal parameter that the power module is in an abnormal state, the step of controlling the power module to stop voltage processing specifically includes:

[0053] When the output bus voltage reaches a preset overvoltage threshold, it is determined that the power module is in an abnormal state and the power module is controlled to stop voltage processing.

[0054] Optionally, before the step of charging the energy storage circuit in the power unit, the method further includes:

[0055] When the output bus voltage is less than a preset overvoltage threshold, the step of charging the energy storage circuit in the power unit is performed.

[0056] Optionally, the method further comprises:

[0057] In response to a low-load request, when the output bus voltage is less than a preset lower limit voltage, controlling the power module to process the input voltage and then output it;

[0058] When the output bus voltage reaches a preset upper limit voltage, the power module is controlled to stop voltage processing.

[0059] Optionally, while executing the step of controlling the power module to stop voltage processing when the output bus voltage reaches a preset upper limit voltage, the method further includes:

[0060] The energy storage circuit in the power unit is charged.

[0061] Optionally, the power unit is any one of the power units described above; the step of charging the energy storage circuit in the power unit specifically includes:

[0062] Controlling the upper bridge arm drive circuit in the power unit to be in a first working state;

[0063] Wherein, the first working state includes: when the number of the power unit is one, the upper bridge arm driving circuit drives the upper bridge arm switch circuit in the power unit to be in a conducting state;

[0064] When there are multiple power units, the multiple upper bridge arm driving circuits drive the corresponding multiple upper bridge arm switch circuits to be in the on state alternately in sequence.

[0065] The present application also proposes a control device, which includes: a memory, a processor, and a power module control program stored in the memory and executable on the processor, wherein the power module control program is configured to implement the steps of the power module control method as described in any one of the above items.

[0066] The present application also proposes a refrigeration device, comprising a power supply circuit as described in any one of the above items; and / or,

[0067] The bridge arm driving circuit as described above; and / or,

[0068] A power unit as described in any one of the above; and / or,

[0069] A power module as described in any one of the above items; and / or,

[0070] A control device as described above.

[0071] The present application proposes a power supply circuit, which includes: an energy storage circuit; a power supply circuit, the power supply circuit is used to output a driving voltage; the energy storage circuit is electrically connected to the power supply circuit; wherein, one of the energy storage circuit and the power supply circuit is used to connect to the power supply end of the upper bridge arm driving circuit, and the other is used to connect to the power supply end of the lower bridge arm driving circuit. In this way, in practical applications, for the bridge arm driving circuit of the same bridge arm, there is no need to set up independent power supplies for the upper and lower bridge arm driving circuits respectively. It is only necessary to set up a power supply circuit for outputting the driving voltage for one of the upper and lower bridge arm circuits to meet the working requirements of the upper and lower bridge arm driving circuits. In this way, when the power supply circuit of the present application is set in a power module, the number of driving power supplies used to power the driving circuit in the power module can be effectively reduced, which effectively reduces the hardware cost of the power module and reduces the complexity of the isolation design between the driving power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0073] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0074] Figure 1 This is a schematic diagram of a circuit module of an embodiment of a power supply circuit of the present application;

[0075] Figure 2 A schematic diagram of a circuit module of another embodiment of the power supply circuit of the present application;

[0076] Figure 3 This is a schematic diagram of a circuit module of another embodiment of the power supply circuit of the present application;

[0077] Figure 4 A schematic diagram of a circuit module of an embodiment of a power unit of the present application;

[0078] Figure 5 This is a schematic diagram of power supply circuit in one embodiment of the power unit of the present application;

[0079] Figure 6 This is another power supply schematic diagram of the power supply circuit in one embodiment of the power unit of the present application;

[0080] Figure 7 A topological diagram of a buck rectifier circuit formed by multiple power units of the present application;

[0081] Figure 8 A schematic diagram of a circuit module of an embodiment of a power module of the present application;

[0082] Fig. 9 This is a flow chart of an embodiment of a power module control method of the present application;

[0083] Fig.10 A schematic diagram of a flow chart of another embodiment of the power module control method of the present application;

[0084] Fig.11 This is a flow chart of another embodiment of the power module control method of the present application;

[0085] Fig.12 This is a flow chart of another embodiment of the power module control method of the present application.

[0086] Reference numerals

[0087]

[0088] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0089] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0090] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0091] It should be understood that the power module is used to process the input DC voltage or AC voltage and then output it to the back-end load or power consumption module, such as a buck rectifier power module, a boost rectifier power module, an inverter power module, etc. It often includes multiple bridge arm switch circuits, and a corresponding drive circuit is set to drive the bridge arm switch circuit. In the existing power module, a separate drive circuit is often set for each drive circuit. For example, the buck rectifier power module includes a three-phase six-switch BUCK circuit, and a corresponding drive circuit is set for each switch, and corresponding to each drive circuit, a total of six independent drive power supplies need to be set.

[0092] However, multiple independent driving power supplies need to occupy a certain space, which is not conducive to the miniaturization design of the power module. At the same time, multiple independent driving power supplies also increase the hardware cost and increase the complexity of the isolation design between the multiple independent driving power supplies.

[0093] To this end, the present application proposes a power supply circuit applied to a bridge arm driving circuit, wherein the bridge arm driving circuit includes an upper bridge arm driving circuit 30 and a lower bridge arm driving circuit 40 .

[0094] refer to Figure 1 In one embodiment of the present application, the power supply circuit includes:

[0095] Energy storage circuit 20;

[0096] A power supply circuit 10, the power supply circuit 10 is used to output a driving voltage; the energy storage circuit 20 is electrically connected to the power supply circuit 10;

[0097] Among them, one of the energy storage circuit 20 and the power supply circuit 10 is used to be connected to the power supply end of the upper bridge arm driving circuit 30 , and the other is used to be connected to the power supply end of the lower bridge arm driving circuit 40 .

[0098] Optionally, the power circuit 10 may be composed of an independent power supply, such as a battery, a programmable power supply, etc. Optionally, the power circuit 10 may also be a voltage conversion circuit, which is used to process the input voltage and then output it. For example, the power supply circuit is set in the refrigeration equipment, and the power circuit 10 is used to convert the voltage output by a power supply in the refrigeration equipment or the voltage output by the distribution box and then output a driving voltage that satisfies the operation of the bridge arm driving circuit. Optionally, the power circuit 10 may also include both of the above embodiments.

[0099] Optionally, the energy storage circuit 20 can be implemented by using energy storage elements such as capacitors, such as electrolytic capacitors, film capacitors, super capacitors, etc. Among them, if there are multiple capacitors, multiple capacitors can be combined in series and parallel to form a capacitor with the capacitance required by the designer. Optionally, the energy storage element can also be implemented by inductance. Or, at least one of the above different types of energy storage elements is combined to form. In one embodiment of the present application, reference Figure 3 , the energy storage element includes a first capacitor.

[0100] Optionally, in one embodiment, reference Figure 2 , the positive and negative electrodes of the power supply circuit 10 and the two ends of the energy storage circuit 20 are connected one by one. In the device provided with the power supply circuit, the power supply circuit 10 can be controlled by an external control signal and / or a control signal inside the power module. Taking the example that the power supply circuit 10 is connected to the power supply end of the upper bridge arm driving circuit 30 and the energy storage circuit 20 is connected to the power supply end of the lower bridge arm driving circuit 40, when it is necessary to control the upper bridge arm driving circuit 30 to control the upper bridge arm switch circuit 70, the power supply circuit 10 is controlled to output a driving voltage to power the upper bridge arm driving circuit 30 and the lower bridge arm driving circuit 40, and to charge the energy storage circuit 20. When it is necessary to control the lower bridge arm driving circuit 40 to control the lower bridge arm switch circuit 80, the power supply circuit 10 is controlled to stop outputting, and at this time, the energy storage circuit 20 supplies power to the lower bridge arm driving circuit 40, and can even supply power to the upper bridge arm driving circuit 30 at the same time, without the need to independently set power supplies for the two driving circuits at the same time.

[0101] Optionally, in another embodiment, in order to reduce the control of the power supply circuit 10, the control complexity of the power supply circuit can be reduced, and even the control complexity of the power module provided with the power supply circuit of the present application can be reduced. Figure 3 and Figure 4, the power supply circuit has an output positive terminal for connecting to the positive power terminal of the upper bridge arm driving circuit and an output negative terminal for connecting to the negative power terminal of the upper bridge arm driving circuit; the first end of the energy storage circuit is used to connect to the positive power terminal of the lower bridge arm driving circuit, the first end of the energy storage circuit is connected to the output positive terminal of the power supply circuit, and the second end of the energy storage circuit is used to connect to the negative power terminal of the lower bridge arm driving circuit. In this way, the power supply circuit 10 can charge the energy storage circuit 20 through the bridge arm switch circuit in the power module, for example, referring to Figure 4 The power supply circuit 10 is connected to the power supply end of the upper bridge arm driving circuit 30, the energy storage circuit 20 is connected to the power supply end of the lower bridge arm driving circuit 40, and only the positive output terminal of the power supply circuit 10 is connected to the first end of the energy storage circuit 20. Figure 4 The negative power terminal of the upper bridge arm driving circuit 30 is connected to the upper bridge arm switch circuit 70, and the negative power terminal of the lower bridge arm driving circuit 40 is connected to the first end of the lower bridge arm switch circuit 80. When the upper bridge arm driving circuit 30 controls the upper bridge arm switch circuit 70 to be in the on state, the power supply circuit 10, the upper bridge arm switch circuit 70 and the energy storage circuit 20 can form an electrical loop, so that the power supply circuit 10 supplies power to the energy storage circuit 20 and the lower bridge arm driving circuit 40. When the upper bridge arm switch is in the off state, the energy storage circuit 20 supplies power to the lower bridge arm driving circuit 40. With this arrangement, there is no need to independently set power supplies for the two driving circuits at the same time, and there is no need to control the power supply circuit, thereby reducing the complexity of control.

[0102] In summary, through the above-mentioned setting of the power supply circuit of the present application, for the bridge arm driving circuit of the same bridge arm, there is no need to set up independent power supplies for the upper and lower bridge arm driving circuits 40 respectively. It is only necessary to set up a power supply circuit 10 for outputting the driving voltage for one of the upper and lower bridge arm circuits to meet the working requirements of the upper and lower bridge arm driving circuits 40. In this way, when the power supply circuit of the present application is set in a power module, the number of driving power supplies used to power the driving circuit in the power module can be effectively reduced, which effectively reduces the hardware cost of the power module and reduces the complexity of the isolation design between the driving power supplies.

[0103] refer to Figure 3 In one embodiment of the present application, the power supply circuit further includes: a current limiting circuit 50, which is arranged in series in the path between the power supply circuit 10 and the energy storage circuit 20.

[0104] Optionally, the current limiting circuit 50 may also be a parasitic resistance formed directly by a path between the energy storage circuit and the power supply circuit, and the parasitic resistance includes line resistance in the path, connection resistance, and the like.

[0105] Optionally, the current limiting circuit 50 can be implemented using a current limiting load, for example, a current limiting resistor; when the power supply circuit 10 outputs a driving voltage to charge the capacitor, the presence of the current limiting resistor will cause the current in the charging circuit to remain below a preset current value (determined by the size of the driving voltage and the resistance value of the current limiting resistor selected by the designer), thereby effectively improving the stability and reliability of the power supply current.

[0106] Optionally, the current limiting circuit 50 may also be implemented by a switching device, such as a switch tube, a relay, etc. The switching device may receive an external control signal, such as a PWM signal, and be in a corresponding switching state to keep the current in the charging circuit below a preset current value (set by the R&D personnel), effectively improving the stability and reliability of the power supply current.

[0107] In this way, by setting a current limiting circuit 50 between the power supply circuit 10 and the energy storage circuit 20, the situation in which the energy storage circuit 20 is damaged due to excessive charging current during the process of the power supply circuit 10 charging the energy storage circuit 20 can be improved, thereby effectively improving the stability and reliability of the power supply current operation.

[0108] refer to Figure 3 In one embodiment of the present application, the power supply circuit further includes: a first unidirectional conductive circuit 60, the first unidirectional conductive circuit 60 is arranged in series in a path between the power supply circuit 10 and the energy storage circuit 20, the anode of the first unidirectional conductive circuit 60 is connected to the power supply circuit 10, and the cathode of the first unidirectional conductive circuit 60 is electrically connected to the energy storage circuit 20;

[0109] The first unidirectional conducting circuit 60 is used for unidirectionally outputting the driving voltage output by the power supply circuit 10 to the energy storage circuit 20 .

[0110] Optionally, the first unidirectional conduction circuit 60 can be implemented by a unidirectional conduction device, such as a diode, a fast recovery diode, a Schottky diode, etc. The first unidirectional conduction circuit 60 can not only realize unidirectional conduction, so as to prevent the voltage output by the energy storage circuit 20 from reversely impacting the power supply circuit 10. At the same time, the first single-phase conduction circuit can also cooperate with the energy storage circuit 20 to form a bootstrap circuit, so as to further ensure the reliability and stability of the energy storage circuit 20 supplying power to the drive circuit connected thereto.

[0111] refer to Figure 3 The present application also proposes a bridge arm driving circuit, comprising an upper bridge arm driving circuit 30, a lower bridge arm driving circuit 40 and a power supply circuit as described in any one of the above items; wherein, one of the energy storage circuit 20 and the power supply circuit 10 is connected to the power supply end of the upper bridge arm driving circuit 30, and the other is connected to the power supply end of the lower bridge arm driving circuit 40.

[0112] In this embodiment, the bridge arm driving circuit can be formed by using a driving chip or by building electronic components. It is worth noting that since the bridge arm driving circuit of the present application includes the above-mentioned power supply circuit. Therefore, the bridge arm driving circuit of the present application includes all the technical solutions of the power supply circuit, and at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0113] refer to Figure 4 The present application also proposes a power unit, which includes an upper bridge arm switch circuit 70, a lower bridge arm switch circuit 80 and the above-mentioned bridge arm drive circuit; wherein the upper bridge arm drive circuit 30 is connected to the controlled end of the upper bridge arm switch circuit 70, and the lower bridge arm drive circuit 40 is connected to the controlled end of the lower bridge arm switch circuit 80.

[0114] It is worth noting that since the power unit of the present application includes the above-mentioned bridge arm driving circuit, the power unit of the present application includes all technical solutions of the bridge arm driving circuit and at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0115] Optionally, at least one power unit can form different power circuit topologies, for example, at least one buck rectifier power unit can be arranged in parallel with each other to form a buck rectifier power circuit topology, at least one rectifier power unit can be arranged in parallel with each other to form a rectifier power circuit topology, and so on.

[0116] Optionally, based on the above embodiment, in one embodiment, refer to Figure 4 , the power supply circuit 10 has an output positive terminal connected to the positive power terminal of the upper bridge arm driving circuit 30 and an output negative terminal connected to the negative power terminal of the upper bridge arm driving circuit 30;

[0117] The power supply end of the lower bridge arm driving circuit 40 includes a positive power supply end and a negative power supply end;

[0118] The first end of the energy storage circuit 20 and the output positive terminal are respectively connected to the positive terminal of the power supply of the lower bridge arm driving circuit 40, the output negative terminal is electrically connected to the upper bridge arm switch circuit 70, and the second end of the energy storage circuit 20 and the first end of the lower bridge arm switch circuit 80 are respectively connected to the negative terminal of the power supply of the lower bridge arm driving circuit 40;

[0119] Wherein, when the upper bridge arm switch circuit 70 is in the on state, the driving voltage output by the power supply circuit 10 is output to the power supply end of the energy storage circuit 20 and the lower bridge arm drive circuit 40 via the bridge arm switch circuit;

[0120] When the upper bridge arm switch circuit 70 is in an off state, the energy storage circuit 20 outputs a first voltage to the power supply terminal of the lower bridge arm drive circuit 40 .

[0121] In this embodiment, reference Figure 5 As shown in the schematic diagram of the flow of electrical signals, when the upper bridge arm driving circuit 30 controls the upper bridge arm switching circuit 70 to be in the on state, the power supply circuit 10, the upper bridge arm switching circuit 70 and the energy storage circuit 20 can form an electrical loop so that the power supply circuit 10 supplies power to the energy storage circuit 20 and the lower bridge arm driving circuit 40.

[0122] refer to Figure 6 As shown in the schematic diagram of the flow of electrical signals, when the upper bridge arm driving circuit 30 controls the upper bridge arm switch to be in the off state, the energy storage circuit 20 supplies power to the lower bridge arm driving circuit 40. With this arrangement, there is no need to independently set power supplies for the two driving circuits at the same time, and there is no need to control the power supply circuit, thereby reducing the complexity of control.

[0123] Based on the above embodiments, reference Figure 4 In one embodiment, the upper bridge arm switch circuit 70 includes a first diode device and a first switch tube, the anode of the first diode device and the output negative terminal are respectively connected to the first end of the first switch tube, and the controlled end of the first switch tube is connected to the upper bridge arm drive circuit 30; the first end of the upper bridge arm switch circuit 70 includes the first end of the first diode device, and the second end of the upper bridge arm switch circuit 70 includes the second end of the first switch tube.

[0124] The lower bridge arm switch circuit 80 includes a second diode device and a second switch tube, the anode of the second diode device is grounded, the second end of the second switch tube is connected to the cathode of the second diode device, the controlled end of the second switch tube is connected to the lower bridge arm drive circuit 40, and the second end of the energy storage circuit 20 is connected to the first end of the second switch tube; the first end of the lower bridge arm switch circuit 80 includes the first end of the second switch tube, and the second end of the lower bridge arm switch circuit 80 includes the anode of the second diode device.

[0125] In this embodiment, the first diode device and the second diode device can be implemented by a diode chip, a fast recovery diode chip, a Schottky diode chip, etc. The first switch tube can be implemented by a switch tube, such as an IGBT switch tube, a MOS tube, a thyristor, a silicon carbide switch tube, a gallium nitride switch tube, etc. The designer can set the corresponding switch tube and / or diode device according to the functional requirements of the power unit, and / or design the corresponding connection mode of multiple power devices, and / or design the control logic of the corresponding switch tube to perform the switching action.

[0126] For example Figure 4 middle, Figure 4 The middle switch tube is implemented by an N-type IGBT device, the emitter of the first switch tube is respectively connected to the anode of the first diode device and the negative power supply terminal of the upper bridge arm drive circuit 30, the first end of the upper bridge arm switch circuit 70 includes the cathode of the first diode device, the collector of the first switch tube and the negative power supply terminal of the lower bridge arm drive circuit 40 are respectively connected to the emitter of the second switch tube, the collector of the second switch tube is connected to the cathode of the second diode device, and the second end of the lower bridge arm switch circuit 80 includes the anode of the second diode device. When multiple of the above power units are connected in parallel, they can form the following Figure 7 The buck rectifier circuit topology shown is as follows, and when the upper bridge arm driving circuit 30 drives the first switch tube to be in the on state, the power supply circuit 10 can supply power to the lower bridge arm driving circuit 40 and charge the energy storage circuit 20. When the upper bridge arm driving circuit 30 drives the first switch tube to be in the off state, the energy storage circuit 20 will output the first voltage to continue to supply power to the lower bridge arm driving circuit 40. The specific process and the effects produced have been described in the above embodiments and will not be repeated here.

[0127] In summary, through the above configuration, in the power unit of the present application, the number of driving power supplies for powering the driving circuit can be reduced, thereby effectively reducing the hardware cost of the power unit and the space occupied by the circuit. Furthermore, for a power module provided with the power unit of the present application, the hardware cost can be reduced accordingly and the integration of the module can be improved, and the complexity of the isolation design between the driving power supplies in the power module can be effectively reduced.

[0128] The present application also proposes a power module, comprising: at least one power unit as described above. It is worth noting that since the power module of the present application includes the above-mentioned power unit. Therefore, the power module of the present application includes all the technical solutions of the power unit, and at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Among them, the power units in the power module can all be the power units proposed in the present application, or at least one of them is a power unit that separately sets a driving power supply for the upper and lower bridge arm driving circuits 40.

[0129] refer to Figure 8 In one embodiment, the power module is a step-down rectifier module. Figure 8 The three-phase step-down rectifier module is shown in the figure. The power module can step down and rectify the connected three-phase AC voltage and then output it to the subsequent circuit or the subsequent load.

[0130] It should be understood that, based on the contents of the above embodiments, the energy storage circuit 20 in the power supply circuit will provide a working voltage to the driving circuit alone. Therefore, during the actual operation of the power module, if the electrical energy stored in the energy storage circuit 20 is insufficient, the output voltage thereof may be insufficient to meet the working requirements of the driving circuit electrically connected thereto, thereby causing the power module to operate abnormally.

[0131] To this end, the present application also proposes a power module control method for controlling any of the power modules described above. It is understandable that a control device may be provided in a device provided with a power module, or in the power module itself, and a processor and a memory are integrated in the control device, the memory is used to store the following method, and the processor is used to execute the following method. The control device can be implemented by a main controller, such as an MCU, a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), a PLC, a SOC (System On Chip), etc.

[0132] refer to Fig. 9 In one embodiment of the present invention, the method includes:

[0133] Step S100, controlling the power module to operate so as to process the voltage connected to the power module and then output it;

[0134] In this embodiment, the control device can control the multiple driving circuits in the power module to output corresponding driving signals to the corresponding bridge arm switch circuits according to the control program pre-stored by the R&D personnel, so as to control the multiple bridge arm switch circuits to switch between the on state and the off state according to a certain logic, so that the power module will output the connected voltage after performing the corresponding voltage processing. Figure 8 In the three-phase buck rectifier module shown in the figure, the control device can control multiple drive circuits to output drive signals with corresponding duty cycles to the controlled ends of the correspondingly connected bridge arm switch circuits, so that the three-phase bridge arm switch circuits can work, thereby rectifying and stepping down the connected three-phase AC voltage for output.

[0135] Step S200, within a first preset time period before the upper arm switch circuit 70 or the lower arm switch circuit 80 corresponding to the energy storage circuit 20 in the power unit is driven for the first time by the corresponding drive circuit, the energy storage circuit 20 is charged and the charging action is continued for a second preset time period; wherein the second preset time period is less than the first preset time period.

[0136] In this embodiment, when the control device needs to control the upper arm switch circuit 70 or the lower arm switch circuit 80 corresponding to the drive circuit connected to the energy storage circuit 20 to be driven by the corresponding drive circuit for the first time, the energy storage circuit 20 can be charged first. The first driving operation can include the drive circuit driving the bridge arm switch circuit to switch from a closed conductive state to an open disconnected state, or from an open disconnected state to a closed conductive state.

[0137] Optionally, based on the embodiment in which the positive and negative electrodes of the power supply circuit 10 and the two ends of the energy storage circuit 20 are connected one-to-one, the control device can control the power supply circuit 10 in the same power unit as the energy storage circuit 20 to output a driving voltage within the above-mentioned first preset time length to charge the energy storage circuit 20, and continue for a second preset time length. Among them, the first preset time length and the second preset time length are both set by the designer according to the needs. When the designer designs the second preset time length, it is necessary to consider the total resistance and total capacitance in the charging circuit of the energy storage circuit 20 and the power supply circuit 10 to ensure that within the first preset time length, the energy storage circuit 20 is sufficient to independently meet the working power demand of the drive circuit.

[0138] Optionally, based on the above-mentioned embodiment of charging the energy storage circuit 20 via the upper bridge arm switch circuit 70, refer to Figure 4-8 , the method further comprises:

[0139] The step S200, in which the upper arm switch circuit 70 or the lower arm switch circuit 80 corresponding to the energy storage circuit 20 in the power unit is charged for a first preset time before the corresponding driving circuit drives the energy storage circuit 20 for the first time, specifically includes:

[0140] Within a first preset time period before the lower bridge arm switch circuit 80 in the power unit is driven for the first time by the corresponding drive circuit, the upper bridge arm drive circuit 30 is controlled to drive the upper bridge arm switch circuit 70 to be in the on state and maintain it for a second preset time period.

[0141] In this embodiment, the first driving operation includes switching from an open disconnected state to a closed conductive state. According to the pre-stored control program, the control device needs to control the lower bridge arm switch circuit 80 of any power unit to be in the conductive state for the first time within the first preset time length, and will first control the upper bridge arm switch circuit 70 of the same power supply to be in the conductive state and maintain the second preset time length, so that the power supply circuit 10 can charge the energy storage circuit 20 through the upper bridge arm switch circuit 70, so that the energy storage circuit 20 can meet the working power demand of the lower bridge arm drive circuit 40 to control the lower bridge arm switch circuit 80 to be in the conductive state for the first time.

[0142] In summary, through the above settings, the power module of the present application can ensure that the energy storage circuit 20 is sufficient to meet the working power demand of the drive circuit electrically connected thereto during operation, thereby improving the situation where the drive circuit cannot work due to insufficient energy storage in the energy storage circuit 20. For example, when the power supply circuit 10 has not yet overcharged the energy storage circuit 20, but the bridge arm drive circuit corresponding to the energy storage circuit 20 already needs to be in a working state, the above settings can ensure that the drive circuit can normally drive the bridge arm switch circuit to operate, thereby effectively improving the reliability and stability of the power module operation.

[0143] In addition, it should be understood that during the operation of the power module, due to interference from external or internal factors, such as changes in the control mode, the influence of the working environment, and the influence of the total working time, the electric energy stored in the energy storage circuit 20 may not be able to meet the working power demand of the driving circuit at a certain moment (the non-driven corresponding bridge arm switch circuit is driven to work for the first time), which may also cause the corresponding driving circuit to drive the bridge arm switch circuit to operate abnormally.

[0144] To this end, in one embodiment of the utility model, within the third preset time before the upper bridge arm switch circuit 70 or the lower bridge arm switch circuit 80 corresponding to the energy storage circuit 20 in the power unit is driven by the corresponding drive circuit, the energy storage circuit 20 is charged for a fourth preset time; wherein the fourth preset time is less than the third preset time. In this way, each time before the control device needs to control the drive circuit connected to the energy storage circuit 20 to work, the power supply circuit 10 in the same power unit will be controlled to charge the energy storage circuit 20 to ensure that the energy storage circuit 20 meets the working power demand of the bridge arm drive circuit, further effectively improving the reliability and stability of the power module.

[0145] Optionally, based on Figure 4-8 In the illustrated embodiment, the step of charging the energy storage circuit 20 for a fourth preset time period before the upper arm switch circuit 70 or the lower arm switch circuit 80 corresponding to the energy storage circuit 20 in the power unit is driven by the corresponding drive circuit within the third preset time period specifically includes:

[0146] Acquire a multi-phase voltage connected to the power circuit;

[0147] When any phase voltage is a negative voltage, within the third preset time before the lower bridge arm switch circuit 80 in the power unit corresponding to the phase voltage is in the on state, the energy storage circuit 20 in the power unit corresponding to the phase voltage is charged and lasts for a fourth preset time.

[0148] In this embodiment, in the process of controlling the power module to perform step-down rectification, when a phase voltage is a negative voltage, the lower bridge arm switch tube of the corresponding power unit needs to be turned on after a certain period of time. Therefore, the control device will control the upper bridge arm of the same power unit to be in a conductive state within the third preset time before turning on, and maintain the fourth preset time to charge the energy storage circuit 20, thereby ensuring that the energy storage circuit 20 meets the working power demand of the bridge arm drive circuit, and further effectively improves the reliability and stability of the power module. Among them, the third preset time and the fourth preset time are pre-stored by the designer and saved in the control device like the first preset time and the second preset time.

[0149] In addition, the control device can also obtain the working parameters of the device in the power module, or obtain the working parameters of the device, and adaptively perform a charging action on the energy storage circuit 20. Optionally, in another embodiment, the method further includes: obtaining the voltage value of the corresponding energy storage circuit within the fifth preset time before the upper bridge arm switch circuit or the lower bridge arm switch circuit corresponding to the energy storage circuit in the power unit is driven by the corresponding drive circuit; when the voltage value does not reach the preset threshold, the energy storage circuit is charged for the sixth preset time. In this embodiment, the control device can obtain the voltage value at both ends of each energy storage circuit 20, and within the fifth preset time before the bridge arm drive circuit corresponding to a certain energy storage circuit 20 needs to drive the bridge arm switch circuit to act, it is determined whether the voltage value at both ends of the energy storage circuit 20 meets the preset threshold (set by the R&D personnel, the voltage value reaches the preset threshold, then it can meet the working requirements of the drive circuit), if not, the energy storage circuit 20 is charged and continued for the sixth preset time as in the above-mentioned multiple embodiments, so as to ensure that the energy storage circuit 20 meets the working power demand of the bridge arm drive circuit. Among them, the sixth preset time length is shorter than the fifth preset time length, and both can be set by R&D personnel.

[0150] In addition, it should be understood that in actual situations, in order to cooperate with low-voltage scenarios, considering the hardware cost and design complexity, an adaptive switch tube will be selected in the power unit. In the process of the voltage connected to the power module being an AC voltage, the connected AC voltage will change. Therefore, in the process of executing the above steps, the voltage value of each phase of the input AC voltage will also be obtained at the same time, and the power unit corresponding to the one with the largest absolute value will be controlled to be in a stopped working state, that is, the corresponding bridge arm drive circuit is controlled to control the upper and lower bridge arm switch circuits 80 to be in a disconnected state, so as to ensure the safety of the power module and improve the stability of the power module.

[0151] It should be understood that when the power circuit is in an abnormal state, the voltage processing work will be stopped, and it will automatically return to a normal working state after the abnormal state is eliminated. In this process, the electric energy in the energy storage circuit 20 will be gradually consumed. However, for the control device, it is uncertain when the abnormal state will be eliminated, which results in the control device being unable to control the power supply circuit 10 in the power module to pre-charge the energy storage circuit 20. If the power circuit is restored to the working state, the control device just needs to control the drive circuit connected to the energy storage circuit 20 to work. At this time, the drive circuit may work abnormally due to insufficient electric energy in the energy storage circuit 20.

[0152] For this purpose, refer to Fig.10 In one embodiment of the present utility model, the method further includes:

[0153] Step S300, obtaining output electrical signal parameters of the power module;

[0154] Step S400: When it is determined according to the electrical signal parameter that the power module is in an abnormal state, controlling the power module to stop voltage processing;

[0155] Optionally, a circuit module for detecting the parameters of the electrical signal output by the power module may be provided in the device, such as a current detection module electrically connected to the control device and / or a voltage detection module electrically connected to the control device; optionally, the above-mentioned circuit module for detection may also be integrated with the control device.

[0156] Optionally, refer to Fig.11 In one embodiment, the electrical signal parameters include: output bus current, for example, Figure 8 In the embodiment shown, the output bus current is the current flowing through the output inductor. The current detection module in the device / control device can be implemented by using a Hall current detection module and a current sensing resistor.

[0157] The step S400, when it is determined according to the electrical signal parameters that the power module is in an abnormal state, controlling the power module to stop voltage processing specifically includes: step S410, when the control device detects through the current detection module that the output bus current reaches a preset current threshold (preset by the R&D personnel), it will determine that the power module is in an abnormal state, that is, it is determined that the current power module output is overcurrent, and then the power module will be controlled to stop voltage processing. For example Figure 8 In the embodiment shown in , all driving circuits are controlled to drive the corresponding bridge arm switch tubes to be in an open state, thereby stopping the power module and stopping the voltage processing work.

[0158] Optionally, refer to Fig.12 In another embodiment, the electrical signal parameter includes: output bus voltage. Figure 8 In the embodiment shown, the output bus voltage is the voltage flowing through the output capacitor. Similarly, the voltage detection module in the device / control device can be implemented by a voltage detection chip or a voltage division detection circuit.

[0159] The step S400, when it is determined according to the electrical signal parameters that the power module is in an abnormal state, the step of controlling the power module to stop voltage processing specifically includes: step S420, when the output bus voltage reaches a preset overvoltage threshold, determining that the power module is in an abnormal state, that is, determining that the power module has an abnormal state of output overvoltage, and controlling the power module to stop voltage processing.

[0160] The control device controls the power module to stop voltage processing, that is, controls the power module not to convert the input voltage, and the power module stops outputting voltage. Figure 8 In the process, all the bridge arm switch circuits stop being in the switching state, so that the power module will not output the connected AC voltage after stepping down and rectifying it. At this time, the power module does not completely stop working and is not completely powered off.

[0161] Step S500: charging the energy storage circuit 20 in the power unit.

[0162] In the process of stopping the voltage processing of the power module, the electric energy stored in the energy storage circuit 20 in the power module will be gradually consumed. Therefore, the control device will control the power supply circuit 10 in the power module to charge the energy storage circuit 20 in this process, so that when the abnormal state of the power module is eliminated, the energy storage circuit 20 has enough electric energy to meet the working power demand of the driving circuit.

[0163] Optionally, based on the above-mentioned embodiment in which the positive and negative poles of the power supply circuit 10 and the two ends of the energy storage circuit 20 are connected one-to-one, the control device can control the power supply circuit 10 in the power unit to start outputting the driving circuit to charge the energy storage circuit 20.

[0164] Optionally, based on the above-mentioned embodiment of charging the energy storage circuit 20 via the upper bridge arm switch circuit 70, refer to Figure 4-8 In one embodiment, the step of charging the energy storage circuit 20 in the power unit specifically includes:

[0165] Controlling the upper bridge arm driving circuit 30 in the power unit to be in a first working state;

[0166] Wherein, the first working state includes: when the number of the power unit is one, the upper bridge arm driving circuit 30 drives the upper bridge arm switch circuit 70 in the power unit to be in the on state;

[0167] When there are multiple power units, the multiple upper bridge arm driving circuits 30 drive the corresponding multiple upper bridge arm switch circuits 70 to be in the on state alternately in sequence.

[0168] In this embodiment, when there are multiple power units, the control device will control the upper bridge arm switch circuits 70 of the multiple power units to be in the on state in turn according to the preset time setting of the designer, and each time the upper bridge arm switch circuit 70 is in the on state for a certain period of time. It should be noted that at the same time, only the upper bridge arm switch circuit 70 of one of the multiple power units is in the on state.

[0169] To sum up, through the above-mentioned settings, when the power module is in the process of temporarily stopping voltage processing due to an abnormality, the control device will control the power module to charge its own energy storage circuit 20, thereby ensuring that when the power module recovers from an abnormal state to a normal state, the energy storage circuit 20 has sufficient electrical energy to meet the working power requirements of the driving circuit, thereby effectively improving the reliability and stability of the power module.

[0170] refer to Fig.11 Based on the embodiment in which the electrical signal parameter includes the output bus current, in one embodiment of the present application, before the step of charging the energy storage circuit 20 in the power unit, the method further includes:

[0171] Step S510, obtaining the output bus voltage;

[0172] The embodiment of obtaining the output bus voltage by the control device mentioned above is referred to and will not be described in detail here.

[0173] Step S520: When the output bus current is less than a preset current threshold and the output bus voltage is greater than or equal to a preset undervoltage threshold, executing the step of charging the energy storage circuit 20 in the power unit.

[0174] In this embodiment, when the output bus current is less than the preset current threshold and the output bus voltage is greater than or equal to the preset undervoltage threshold, the control device will determine that the abnormal state of the power module is only occasional, and the power module can be restored after a certain period of time to continue voltage processing. At this time, the load and circuit modules connected to the rear stage of the power module will not stop working.

[0175] In the above case, the control device will execute the step of charging the energy storage circuit 20 in the power unit according to the process of the above embodiment.

[0176] It is understandable that in another embodiment, if the current output current is still greater than or equal to the preset current threshold or is still greater than or equal to the preset current threshold after a certain period of time (preset by the designer) or the output bus voltage limit is less than the preset undervoltage threshold, it is determined that the current device is completely abnormal, and the power module will be directly controlled to stop working, that is, all bridge arm switch circuits are in a disconnected state, and the entire power module is controlled to be powered off. Even further, the circuit module and load connected to the power module are controlled to stop working and report an overcurrent fault to ensure the safety of the device operation.

[0177] Similarly, reference Fig.12 Based on the embodiment in which the electrical signal parameter includes the output bus voltage, in one embodiment of the present application, before the step of charging the energy storage circuit 20 in the power unit, the method further includes:

[0178] Step S530: When the output bus voltage is less than a preset overvoltage threshold, executing the step of charging the energy storage circuit 20 in the power unit.

[0179] In this embodiment, after the power module stops the voltage processing work, if the output bus voltage is less than the preset overvoltage threshold, the control device will determine that the abnormal state of the power module is only occasional, and the power module can be restored to continue the voltage processing work after a certain period of time, and the load and circuit module connected to the rear stage of the power module will not stop working. In the above case, the control device will perform the step of charging the energy storage circuit 20 in the power unit according to the process of the above embodiment.

[0180] It is understandable that in another embodiment, if the output bus voltage still reaches the preset overvoltage threshold, it is determined that the current device is completely abnormal, and the power module will be directly controlled to stop working, that is, all bridge arm switch circuits are in a disconnected state, and the entire power module is controlled to be powered off, such as disconnecting the power supply to all drive circuits in the power module. Even further, the circuit module and load connected to the power module are controlled to stop working and report an overcurrent fault to ensure the safety of the device operation.

[0181] It should be understood that when the load connected to the power module is low, that is, the rated voltage and / or rated power of the load is low, if the power module still maintains the original working state, the output effective power is too low, that is, the output efficiency is low, resulting in unnecessary energy waste.

[0182] To this end, in an embodiment of the present application, the method further includes:

[0183] In response to a low-load request, when the output bus voltage is less than a preset lower limit voltage, controlling the power module to process the input voltage and then output it;

[0184] When the output bus voltage reaches a preset upper limit voltage, the power module is controlled to stop voltage processing.

[0185] Optionally, the control device may determine whether the load currently connected to the power module has a low load requirement by communicating with the connected load to obtain whether the current load has a low load request, or by receiving a low load request from another control module of the device where the control device is located.

[0186] The control device can obtain the output bus voltage of the power module by the same method as the above embodiment, which will not be repeated here.

[0187] When the control device responds to a low-load request, it will call out the preset upper limit voltage and preset lower limit voltage (preset by the designer) that are pre-stored therein or obtained from the load / from other control modules, and control the power module to start working. When the output bus voltage reaches the preset upper limit voltage, the power module voltage processing work is stopped (as in the above embodiment). At this time, the output capacitor supplies power to the rear-end load. When the voltage on the output capacitor drops to the preset lower limit voltage, that is, when the output bus voltage drops to the preset lower limit voltage, the control device will control the power module to resume the voltage processing work process.

[0188] For example, refer to Figure 8 In the power module shown in , when the output bus voltage reaches the preset upper limit voltage, the control device controls all driving circuits so that all bridge arm switch circuits are no longer in a switch state that can output the input AC voltage after stepping down and rectifying. When the output bus voltage drops to the preset lower limit voltage, all bridge arm switch circuits are controlled to return to the switch state to achieve stepping down and rectifying the input AC voltage.

[0189] In summary, through the above configuration, when the power module is connected to a low load, the output efficiency of the power module can be effectively improved and the loss of the power module can be reduced.

[0190] It should be understood that, in the above-mentioned embodiment, when the power module stops outputting after voltage processing, the energy storage circuit 20 in the power unit will also gradually consume electric energy, and the control device does not know when the output bus voltage will drop to the preset lower limit voltage, so that when the power module needs to resume outputting after voltage processing, the energy storage circuit 20 may not be able to output sufficient voltage.

[0191] To this end, while executing the step of controlling the power module to stop voltage processing when the output bus voltage reaches the preset upper limit voltage, the method also includes: charging the energy storage circuit 20 in the power unit. In this embodiment, the specific process of performing the charging action can refer to the content described in the above embodiment of performing the charging action, and has the same effect, which will not be repeated here. In this way, through the above setting, not only can the output efficiency of the power module be effectively improved when the power module is connected to a low load, but the stability and reliability of the power module can also be further improved.

[0192] The present application also proposes a control device, which includes: a memory, a processor, and a power module control program stored in the memory and executable on the processor, wherein the power module control program is configured to implement the steps of the power module control method as described in any one of the above items.

[0193] It is worth noting that since the control device of the present application includes the above power module control method, the control device of the present application includes all technical solutions of the power module control method and at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0194] The present application also proposes a refrigeration device, comprising a power supply circuit as described in any one of the above items; and / or, a bridge arm driving circuit as described in any one of the above items; and / or, a power unit as described in any one of the above items; and / or, a power module as described in any one of the above items; and / or, a control device as described in any one of the above items.

[0195] In this embodiment, the refrigeration equipment includes an air conditioner, a refrigerator, and the like.

[0196] It is worth noting that since the refrigeration device of the present application includes the above-mentioned power supply circuit and / or bridge arm driving circuit and / or power unit and / or power module and / or control device, the refrigeration device of the present application includes all the technical solutions of the above-mentioned power supply circuit and / or bridge arm driving circuit and / or power unit and / or power module and / or control device, and at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0197] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A power supply circuit, applied to a bridge arm driving circuit, wherein the bridge arm driving circuit comprises an upper bridge arm driving circuit and a lower bridge arm driving circuit, characterized in that: The power supply circuit comprises: Energy storage circuit; A power supply circuit, the power supply circuit is used to output a driving voltage; the energy storage circuit is electrically connected to the power supply circuit; Among them, one of the energy storage circuit and the power supply circuit is used to be connected to the power supply end of the upper bridge arm driving circuit, and the other is used to be connected to the power supply end of the lower bridge arm driving circuit.

2. The power supply circuit according to claim 1, characterized in that: The energy storage circuit includes: a capacitor.

3. The power supply circuit according to claim 1, characterized in that: The power supply circuit has an output positive terminal for connecting to the positive power terminal of the upper bridge arm driving circuit and an output negative terminal for connecting to the negative power terminal of the upper bridge arm driving circuit; The first end of the energy storage circuit is used to be connected to the positive power terminal of the lower bridge arm driving circuit, the first end of the energy storage circuit is connected to the output positive terminal of the power circuit, and the second end of the energy storage circuit is used to be connected to the negative power terminal of the lower bridge arm driving circuit.

4. The power supply circuit according to any one of claims 1 to 3, characterized in that: The power supply circuit further comprises: a current limiting circuit, the current limiting circuit being arranged in series in a path between the power supply circuit and the energy storage circuit; Wherein, the current limiting circuit includes a current limiting resistor and / or a parasitic resistor formed by a path between the power supply circuit and the energy storage circuit.

5. The power supply circuit according to any one of claims 1 to 3, characterized in that: The power supply circuit further includes: a first unidirectional conductive circuit, the first unidirectional conductive circuit is arranged in series in a path between the power supply circuit and the energy storage circuit, an anode of the first unidirectional conductive circuit is connected to the power supply circuit, and a cathode of the first unidirectional conductive circuit is electrically connected to the energy storage circuit; The first unidirectional conducting circuit is used for unidirectionally outputting the driving voltage output by the power supply circuit to the energy storage circuit.

6. A bridge arm driving circuit, characterized in that: It comprises an upper bridge arm driving circuit, a lower bridge arm driving circuit and a power supply circuit as claimed in any one of claims 1 to 5; Among them, one of the energy storage circuit and the power supply circuit is connected to the power supply end of the upper bridge arm driving circuit, and the other is connected to the power supply end of the lower bridge arm driving circuit.

7. A power unit, characterized in that: The power unit comprises an upper bridge arm switch circuit, a lower bridge arm switch circuit and a bridge arm drive circuit as claimed in claim 6; The upper bridge arm driving circuit is connected to the controlled end of the upper bridge arm switch circuit, and the lower bridge arm driving circuit is connected to the controlled end of the lower bridge arm switch circuit.

8. The power unit according to claim 7, characterized in that: The power supply circuit has an output positive terminal for connecting to the positive power terminal of the upper bridge arm driving circuit and an output negative terminal for connecting to the negative power terminal of the upper bridge arm driving circuit; The power supply end of the lower bridge arm driving circuit includes a positive power supply end and a negative power supply end; The first end of the energy storage circuit and the output positive terminal are respectively connected to the positive terminal of the power supply of the lower bridge arm driving circuit, the output negative terminal is electrically connected to the upper bridge arm switch circuit, and the second end of the energy storage circuit and the first end of the lower bridge arm switch circuit are respectively connected to the negative terminal of the power supply of the lower bridge arm driving circuit; Wherein, when the upper bridge arm switch circuit is in the on state, the driving voltage output by the power supply circuit is output to the power supply end of the energy storage circuit and the lower bridge arm drive circuit via the bridge arm switch circuit; When the upper bridge arm switch circuit is in an off state, the energy storage circuit outputs a first voltage to the power supply terminal of the lower bridge arm drive circuit.

9. The power unit according to claim 8, characterized in that: The upper bridge arm switch circuit includes a first diode device and a first switch tube, the anode of the first diode device and the output negative terminal are respectively connected to the first end of the first switch tube, and the controlled end of the first switch tube is connected to the upper bridge arm drive circuit; the first end of the upper bridge arm switch circuit includes the first end of the first diode device, and the second end of the upper bridge arm switch circuit includes the second end of the first switch tube.

10. The power unit according to claim 8, characterized in that: The lower bridge arm switch circuit includes a second diode device and a second switch tube, the anode of the second diode device is grounded, the second end of the second switch tube is connected to the cathode of the second diode device, the controlled end of the second switch tube is connected to the lower bridge arm drive circuit, and the second end of the energy storage circuit is connected to the first end of the second switch tube; the first end of the lower bridge arm switch circuit includes the first end of the second switch tube, and the second end of the lower bridge arm switch circuit includes the anode of the second diode device.

11. A power module, characterized in that: include: At least one phase of the power unit according to any one of claims 7 to 10.

12. The power module according to claim 11, characterized in that: The power module is a step-down rectifier circuit.

13. A refrigeration device, characterized in that: comprising a power supply circuit as claimed in any one of claims 1 to 5; and / or, The bridge arm driving circuit according to claim 6; and / or, A power unit as claimed in any one of claims 7 to 10; and / or, A power module as claimed in any one of claims 11 to 12.

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