Switching tube negative voltage driving circuit and control method thereof, air conditioner and storage medium

Abstract

The invention provides a switch tube negative voltage driving circuit and a control method thereof, an air conditioner and a storage medium, the switch tube negative voltage driving circuit comprises a bridge circuit and a plurality of driving modules, the bridge circuit comprises two bridge arms, and each bridge arm comprises bridge tubes connected in series; the driving modules and the bridge tubes are connected in a one-to-one correspondence manner; the input sides of all the driving modules are connected to the same power supply; each driving module comprises a driving unit and a negative voltage stabilizing unit, the power supply end of the driving unit is connected to a power supply, the first output end of the driving unit is connected to the control end of the bridge tube through the negative voltage stabilizing unit, and the second output end of the driving unit is connected to one output end of the bridge tube. When the driving unit outputs a high level, the bridge tube can be controlled to be conducted and the negative voltage stabilizing unit is charged, so that the negative voltage stabilizing unit can perform negative voltage driving on the bridge tube when the driving unit outputs a low level, and therefore, a plurality of driving modules can be connected to the same power supply without being limited by high-voltage electrical clearance and creepage distance requirements; and miniaturization is realized.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a negative voltage driving circuit for a switching tube and a control method thereof, an air conditioner and a storage medium. Background Art

[0002] In the related art, for the existing negative voltage driving method of the switch tube, the negative voltage is often driven by the switch power supply outputting negative voltage. Therefore, for the existing bridge circuit, since the bridge circuit includes multiple switch tubes, and for each switch tube, an independent switch power supply winding is often required to be used to power it, therefore, multiple switch power supply windings often need to be synchronously set in the existing bridge circuit; and since the safety distance between the switch power supply windings needs to meet the high-voltage electrical clearance and creepage distance requirements, it is difficult to achieve miniaturization of the power supply and electronic control. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a switch tube negative pressure drive circuit and a control method thereof, an air conditioner and a storage medium, aiming to achieve miniaturization of the circuit.

[0004] In a first aspect, an embodiment of the present application provides a negative voltage driving circuit for a switching tube, comprising:

[0005] A bridge circuit, comprising two bridge arms connected in parallel, each of the bridge arms comprising bridge tubes connected in series;

[0006] A plurality of driving modules, wherein the driving modules and the bridge tubes are connected one by one, and the input sides of all the driving modules are used to be connected to the same power supply;

[0007] Among them, each of the driving modules includes a driving unit and a negative voltage stabilizing unit, the power supply end of the driving unit is used to connect to the power supply, the first output end of the driving unit is connected to the control end of the bridge tube through the negative voltage stabilizing unit, and the second output end of the driving unit is connected to an output end of the bridge tube.

[0008] According to some embodiments of the present application, the driving module further includes a unidirectional conductive unit, a positive electrode of the unidirectional conductive unit is used to be connected to the power supply, and a negative electrode of the unidirectional conductive unit is connected to a power supply end of the driving unit.

[0009] According to some embodiments of the present application, the driving module also includes a first resistor and a second resistor, one end of the first resistor is connected to the negative voltage stabilizing unit, and the other end is connected to the control end of the bridge tube; one end of the second resistor is connected to the control end of the bridge tube, and the other end is connected to an output end of the bridge tube.

[0010] According to some embodiments of the present application, the driving unit includes a driving chip and a first energy storage device, the power supply end of the driving chip is used to connect to the power supply, the first output end of the driving chip is connected to the control end of the bridge tube through the negative voltage stabilizing unit, and the second output end of the driving chip is connected to an output end of the bridge tube; one end of the first energy storage device is connected to the power supply end of the driving chip, and the other end is connected to the second output end of the driving chip.

[0011] According to some embodiments of the present application, the negative voltage stabilizing unit includes a second energy storage device and a voltage stabilizing device, one end of the second energy storage device and the voltage stabilizing device are both connected to the first output end of the driving unit, and the other end of the second energy storage device and the voltage stabilizing device are both connected to the control end of the bridge tube.

[0012] In a second aspect, an embodiment of the present application provides a control method for a switch tube negative voltage drive circuit, which is applied to the switch tube negative voltage drive circuit of the first aspect above, wherein each bridge arm in the switch tube negative voltage drive circuit includes an upper bridge tube and a lower bridge tube; when the switch tube negative voltage drive circuit is applied to a bridge inverter circuit, the control method includes:

[0013] Turning on the lower bridge tube in the bridge arm to charge the first energy storage device corresponding to the upper bridge tube, and charging the second energy storage device corresponding to the lower bridge tube;

[0014] The lower bridge tube in the bridge arm is turned off, and the upper bridge tube in the bridge arm is turned on, so as to charge the second energy storage device corresponding to the upper bridge tube.

[0015] According to some embodiments of the present application, the two bridge arms in the switch tube negative voltage driving circuit are respectively a first bridge arm and a second bridge arm, the first bridge arm includes a first upper bridge tube and a first lower bridge tube, and the second bridge arm includes a second upper bridge tube and a second lower bridge tube;

[0016] The step of turning on the lower bridge tube in the bridge arm includes: turning on the first lower bridge tube and the second lower bridge tube;

[0017] The shutting off the lower bridge tube in the bridge arm and turning on the upper bridge tube in the bridge arm includes: shutting off the first lower bridge tube and the second lower bridge tube, and turning on the first upper bridge tube and the second upper bridge tube.

[0018] According to some embodiments of the present application, after turning on the upper bridge tube in the bridge arm, the control method further includes:

[0019] Get load parameters;

[0020] When the load parameter is greater than or equal to a first predetermined value, the upper bridge tube and the lower bridge tube in the bridge arm are alternately turned on and off according to a first predetermined period.

[0021] In addition, an embodiment of the present application provides a control method for a switch tube negative voltage drive circuit, which is applied to the switch tube negative voltage drive circuit of the first aspect above, wherein each bridge arm in the switch tube negative voltage drive circuit includes an upper bridge tube and a lower bridge tube; when the switch tube negative voltage drive circuit is applied to a synchronous rectification circuit or a totem pole power correction circuit, the control method includes:

[0022] Turning on the lower bridge tube in each of the bridge arms in turn to charge the first energy storage device corresponding to the upper bridge tube and to charge the second energy storage device corresponding to the lower bridge tube;

[0023] The lower bridge tube in one of the bridge arms and the upper bridge tube in the other bridge arm are turned on in sequence to charge the second energy storage device corresponding to the upper bridge tube.

[0024] According to some embodiments of the present application, the two bridge arms in the switch tube negative voltage drive circuit are respectively a first bridge arm and a second bridge arm, the first bridge arm includes a first upper bridge tube and a first lower bridge tube, and a first intermediate connection point is between the first upper bridge tube and the first lower bridge tube, and the second bridge arm includes a second upper bridge tube and a second lower bridge tube, and a second intermediate connection point is between the second upper bridge tube and the second lower bridge tube; the step of sequentially turning on the lower bridge tube in each of the bridge arms includes:

[0025] When the voltage of the first intermediate connection point is a positive voltage, the second lower bridge tube is turned on;

[0026] When the voltage of the second intermediate connection point is a positive voltage, the second lower bridge tube is turned off, and the first lower bridge tube is turned on.

[0027] According to some embodiments of the present application, sequentially turning on the lower bridge tube in one of the bridge arms and the upper bridge tube in another of the bridge arms includes:

[0028] When the voltage of the first intermediate connection point becomes a positive voltage again, the first upper bridge tube and the second lower bridge tube are turned on;

[0029] When the voltage of the second intermediate connection point becomes a positive voltage again, the second upper bridge tube and the first lower bridge tube are turned on.

[0030] According to some embodiments of the present application, after sequentially turning on the lower bridge tube in one of the bridge arms and the upper bridge tube in another of the bridge arms, the control method further includes:

[0031] Get load parameters;

[0032] When the load parameter is greater than or equal to a second predetermined value, the upper bridge tube and the lower bridge tube in one of the bridge arms are alternately turned on and off according to a second predetermined period, and the lower bridge tube and the upper bridge tube in the other bridge arm are turned on in sequence.

[0033] According to some embodiments of the present application, the two bridge arms in the switch tube negative voltage drive circuit are respectively a first bridge arm and a second bridge arm, the first bridge arm includes a first upper bridge tube and a first lower bridge tube, and a first intermediate connection point is between the first upper bridge tube and the first lower bridge tube, and the second bridge arm includes a second upper bridge tube and a second lower bridge tube, and a second intermediate connection point is between the second upper bridge tube and the second lower bridge tube; the step of sequentially turning on the lower bridge tube and the upper bridge tube in another bridge arm includes:

[0034] When the voltage of the first intermediate connection point is a positive voltage, the second lower bridge tube is turned on;

[0035] When the voltage of the second intermediate connection point is a positive voltage, the second lower bridge tube is turned off, and the second upper bridge tube is turned on.

[0036] In a third aspect, an embodiment of the present application provides a negative voltage driving circuit for a switching tube, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method described in the second aspect above when running the computer program.

[0037] In a fourth aspect, an embodiment of the present application provides an electronic circuit, comprising the negative voltage driving circuit of a switching tube according to the first aspect or the third aspect.

[0038] In a fifth aspect, an embodiment of the present application provides an air conditioner, comprising the negative pressure driving circuit of the switching tube according to the first aspect or the third aspect.

[0039] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method as described in the second aspect above.

[0040] According to the technical solution of the embodiment of the present application, it includes but is not limited to the following technical effects: the negative voltage driving circuit of the switching tube of the embodiment of the present application includes a bridge circuit and multiple driving modules, the bridge circuit includes two bridge arms connected in parallel, and each bridge arm includes a bridge tube connected in series; the driving module and the bridge tube are connected one by one, and the input sides of all driving modules are used to connect to the same power supply; wherein each driving module includes a driving unit and a negative voltage stabilizing unit, the power supply end of the driving unit is used to be connected to the power supply, the first output end of the driving unit is connected to the control end of the bridge tube through the negative voltage stabilizing unit, and the second output end of the driving unit is connected to an output end of the bridge tube. Since the embodiment of the present application adds a negative voltage stabilizing unit between the driving unit and the bridge tube, the bridge tube is controlled to be turned on and the negative voltage stabilizing unit is charged when the driving unit outputs a high level, so that the negative voltage stabilizing unit can drive the bridge tube to a negative voltage when the driving unit outputs a low level to quickly turn off the bridge tube. Therefore, the embodiment of the present application is different from the existing method of using a switching power supply to directly output a negative voltage to drive the switching tube to a negative voltage. Therefore, the embodiment of the present application can connect the input sides of multiple driving modules to the same power supply, so that it is not restricted by the high-voltage electrical clearance and creepage distance requirements, thereby realizing the miniaturization of the power supply and electronic control.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0043] Figure 1 It is a structural schematic diagram of a negative voltage driving circuit of a switching tube provided by an embodiment of the present application;

[0044] Figure 2 It is a structural schematic diagram of a power supply connected to a negative voltage driving circuit of a switching tube provided in an embodiment of the present application;

[0045] Figure 3 This is a flow chart of a control method when a negative voltage driving circuit of a switching tube provided by an embodiment of the present application is applied to a bridge inverter circuit;

[0046] Figure 4 yes Figure 3 A specific flow chart of step S310 and step S320 in the control method of the negative voltage driving circuit of the switching tube shown;

[0047] Figure 5It is a flow chart of a control method when a negative voltage driving circuit of a switching tube provided by an embodiment of the present application is applied to a synchronous rectification circuit or a totem pole power correction circuit;

[0048] Figure 6 yes Figure 5 A specific flow chart of step S510 in the control method of the negative voltage driving circuit of the switching tube shown;

[0049] Figure 7 yes Figure 5 A specific flow chart of step S520 in the control method of the negative voltage driving circuit of the switching tube shown;

[0050] Figure 8 This is a waveform diagram of negative pressure startup of a switch tube negative pressure driving circuit provided by an embodiment of the present application during the startup process;

[0051] Fig. 9 This is a waveform diagram of a negative pressure driving circuit of a switch tube provided by an embodiment of the present application after negative pressure startup optimization during the start-up process;

[0052] Fig.10 This is a driving timing diagram when a negative voltage driving circuit of a switching tube provided by an embodiment of the present application is applied to a bridge inverter circuit;

[0053] Fig.11 This is a driving timing diagram when a negative voltage driving circuit of a switching tube provided by an embodiment of the present application is applied to a synchronous rectification circuit or a totem pole power correction circuit;

[0054] Fig.12 It is a structural schematic diagram of a controller for executing a control method for a negative voltage driving circuit of a switching tube provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0056] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0058] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0059] In some cases, for the existing negative voltage driving method of the switch tube, the switch tube is often driven by the negative voltage output of the switch power supply. Therefore, for the existing bridge circuit, since the bridge circuit includes multiple switch tubes, and each switch tube often needs to be powered by an independent switch power supply winding, therefore, the existing bridge circuit often needs to synchronously set multiple switch power supply windings; and, since the safety distance between the switch power supply windings needs to meet the high-voltage electrical clearance and creepage distance requirements, it is difficult to achieve miniaturization of the power supply and electronic control.

[0060] Based on the above situation, the embodiments of the present application propose a switching tube negative pressure driving circuit and a control method thereof, an air conditioner and a storage medium, aiming to achieve miniaturization of power supply and electronic control.

[0061] The various embodiments of the switch tube negative voltage drive circuit of the present application are further described below in conjunction with the accompanying drawings.

[0062] like Figure 1 As shown, Figure 1 1 is a schematic diagram of the structure of a negative voltage driving circuit for a switch tube provided by an embodiment of the present application. The negative voltage driving circuit for a switch tube of the embodiment of the present application includes but is not limited to a driving module 120 and a bridge circuit 110. Specifically, the bridge circuit 110 includes but is not limited to two bridge arms, and the two bridge arms are connected in parallel, and each bridge arm includes a bridge tube connected in series; in addition, there are multiple driving modules 120, and the driving modules 120 and the bridge tubes are connected one by one, and the input sides of all driving modules 120 are connected to the same power supply.

[0063] In one embodiment, each driving module 120 includes but is not limited to a driving unit 121 and a negative voltage stabilizing unit 122, wherein the driving unit 121 is provided with a power supply end, a first output end, and a second output end, the driving unit 121 is connected to a power supply via the power supply end, the driving unit 121 is connected to a control end of a bridge tube via the first output end and the negative voltage stabilizing unit 122, and the driving unit 121 is connected to an output end of the bridge tube via the second output end.

[0064] Since the embodiment of the present application adds a negative voltage stabilizing unit 122 between the driving unit 121 and the bridge tube, when the driving unit 121 outputs a high level, the bridge tube is controlled to be turned on and the negative voltage stabilizing unit 122 is charged, so that the negative voltage stabilizing unit 122 can negatively drive the bridge tube to quickly turn off the bridge tube when the driving unit 121 outputs a low level. Therefore, the embodiment of the present application is different from the existing method of using a switching power supply to directly output a negative voltage to drive the switching tube with a negative voltage. Therefore, the embodiment of the present application can connect the input sides of multiple driving modules 120 to the same power supply, so that it is not restricted by the high-voltage electrical clearance and creepage distance requirements, thereby realizing the miniaturization of the power supply and electronic control.

[0065] It should be noted that the above-mentioned bridge tube, that is, the switching tube, can be a field effect tube, a triode, or other switching tube that can be controlled to be on and off. The embodiment of the present application does not specifically limit the structural type of the switching tube.

[0066] It is understandable that the above-mentioned bridge pipe can be corresponding to Figure 1 The switching tubes Q1, Q2, Q3 and Q4 are shown in FIG.

[0067] For example, Figure 1 As shown, when a field effect transistor is used as a bridge transistor, the embodiment of the present application can connect the gate of the field effect transistor to the first output terminal of the driving unit 121 through the negative voltage stabilizing unit 122, and connect the source of the field effect transistor to the second output terminal of the driving unit 121.

[0068] In addition, it should be noted that the above-mentioned power supply can be as follows: Figure 2 The form of the switching power supply winding shown may also be other power supply forms, and the embodiment of the present application does not specifically limit the structural form of the power supply.

[0069] In one embodiment, if Figure 1 As shown, the driving module 120 also includes but is not limited to a unidirectional conductive unit, wherein the positive electrode of the unidirectional conductive unit is used to connect to the power supply, and the negative electrode of the unidirectional conductive unit is connected to the power supply end of the driving unit 121.

[0070] Specifically, the embodiment of the present application can use the unidirectional conduction unit to perform the unidirectional conduction function on the current supplied from the power supply to the driving unit 121. It can be understood that the unidirectional conduction unit may include but is not limited to a diode.

[0071] It can be understood that the one-way conducting unit mentioned above can be a unit corresponding to Figure 1 The diodes D6 and D7 are shown in FIG.

[0072] In one embodiment, if Figure 1 As shown, the driving module 120 also includes but is not limited to a first resistor and a second resistor, one end of the first resistor is connected to the negative voltage stabilizing unit 122, and the other end is connected to the control end of the bridge tube; one end of the second resistor is connected to the control end of the bridge tube, and the other end is connected to an output end of the bridge tube.

[0073] It should be noted that the first resistor mentioned above is mainly used for current limiting and plays a role in reducing the oscillation of the bridge tube when it is turned on; in addition, the second resistor mentioned above is mainly used to pull down the bridge tube in the off state and play a role in current release.

[0074] It can be understood that the first resistor mentioned above can be Figure 1 The resistors R1, R2, R3 and R4 shown in FIG. 1 ; Regarding the second resistor mentioned above, it can be corresponding to Figure 1 The resistors R5, R6, R7 and R8 are shown in FIG.

[0075] In one embodiment, if Figure 1 As shown, the driving unit 121 includes a driving chip and a first energy storage device, the power supply end of the driving chip is used to connect to the power supply, the first output end of the driving chip is connected to the control end of the bridge tube through the negative voltage stabilizing unit 122, and the second output end of the driving chip is connected to an output end of the bridge tube; one end of the first energy storage device is connected to the power supply end of the driving chip, and the other end is connected to the second output end of the driving chip.

[0076] Specifically, the first energy storage device is connected between the power supply terminal and the second output terminal of the driving chip, and as the energy storage device of the driving chip, it can supply power to the driving chip after energy storage is completed.

[0077] It is understandable that the above-mentioned driver chip may be a chip corresponding to Figure 1 The chip shown in Drive.

[0078] In addition, it can be understood that the first energy storage device mentioned above can be a device corresponding to Figure 1 Capacitors C6, C7, C8 and C9 are shown in FIG.

[0079] In one embodiment, if Figure 1 As shown, the negative voltage stabilizing unit 122 includes a second energy storage device and a voltage stabilizing device, one end of the second energy storage device and the voltage stabilizing device are connected to the first output end of the driving unit 121, and the other end of the second energy storage device and the voltage stabilizing device are connected to the control end of the bridge tube.

[0080] Specifically, when the driving unit 121 outputs a high level through the first output terminal, the bridge tube is driven to conduct through the second energy storage device, and the negative voltage stabilizing unit 122 is charged at the same time. When the voltage on the second energy storage device exceeds the voltage of the voltage stabilizing device, current will pass through the voltage stabilizing device, and the voltage across the second energy storage device will be clamped at this time. In addition, when the driving unit 121 outputs a low level through the first output terminal, since the second energy storage device has been charged, when the driving unit 121 outputs a low level, the negative terminal of the second energy storage device is loaded on the control end of the bridge tube, and the positive terminal of the second energy storage device is loaded to an output end of the bridge tube through the driving unit 121, thereby driving the bridge tube with a negative voltage to quickly turn off the bridge tube.

[0081] It is understandable that the second energy storage device mentioned above may be a device corresponding to Figure 1 The capacitors C1, C2, C3 and C4 are shown in FIG.

[0082] In addition, it can be understood that the above-mentioned voltage stabilizing device can be a corresponding Figure 1 The Zener diode D1 is shown in FIG.

[0083] In one embodiment, if Figure 1 As shown, the two bridge arms in the switch tube negative voltage drive circuit are respectively a first bridge arm 111 and a second bridge arm 112. The first bridge arm 111 includes a first upper bridge tube Q1 and a first lower bridge tube Q3 connected in series, and the second bridge arm 112 includes a second upper bridge tube Q2 and a second lower bridge tube Q4 connected in series.

[0084] In one embodiment, if Figure 1 As shown, a first intermediate connection point L is between the first upper bridge tube Q1 and the first lower bridge tube Q3, and a second intermediate connection point N is between the second upper bridge tube Q2 and the second lower bridge tube Q4. The first intermediate connection point L and the second intermediate connection point N are used to connect to an input power supply.

[0085] Specifically, the first intermediate connection point L and the second intermediate connection point N can be connected to an AC input power supply or a DC input power supply, which is not specifically limited in the embodiment of the present application.

[0086] Based on the negative voltage driving circuits for switching tubes in the above-mentioned embodiments, specific embodiments of the negative voltage driving circuits for switching tubes of the present application are respectively proposed below.

[0087] In one embodiment, if Figure 1As shown, the switch tube negative voltage drive circuit can be composed of four switch tubes Q1 to Q4 to form a bridge circuit 110. The circuit can realize a totem pole circuit for input voltage rectification and power factor correction and a full-bridge inverter circuit. Among them, the switch tube Q1 is an upper bridge tube, and the driving power supply of the switch tube in the circuit is realized by the diode D6 to realize the bootstrap power supply of the driver chip Drive. When the lower bridge tube Q3 is turned on, the power supply VCC provides a charging circuit for the capacitor C6 through the diode D6, the capacitor C6, and the switch tube Q3. When the driver chip Drive outputs a high level, the driver chip Drive drives the switch tube Q1 through the capacitor C1 and the resistor R1. When the voltage on the capacitor C1 exceeds the voltage Uz of the voltage-stabilizing diode D1, the current passes through the voltage-stabilizing diode D1, and the voltage across the capacitor is clamped at the power supply Uz. When the driver chip Drive outputs a low level, the capacitor C1 drives the switch tube Q1 to turn off through the driver chip Drive and the resistor R1. It should be noted that when the drive chip Drive outputs a low level, the negative terminal of the capacitor C1 is loaded on the gate terminal of Q1 through the resistor R1, and the positive terminal of the capacitor C1 is loaded on the source terminal of the switch tube Q1 through the drive chip Drive. At this time, the voltage between the gate and the source of the switch tube Q1 is -Uz, thereby realizing negative voltage drive.

[0088] It should be noted that Figure 1 The negative pressure driving principle of the switch tubes Q2 to Q4 shown in FIG. 5 is consistent with that of the switch tube Q1.

[0089] like Figure 8 As shown, Figure 8 This is a waveform diagram of a negative voltage start-up of a switch tube negative voltage drive circuit provided by an embodiment of the present application during the start-up process; after multiple drive pulses, the positive and negative voltages loaded on the gate and source of the switch tube can be stable, thereby achieving normal negative voltage drive.

[0090] but, Figure 8 There are obviously some deficiencies in the waveform, that is, the negative voltage values ​​of the first few pulses after the circuit is turned on are relatively low. This can be solved in the following way: first turn on the lower bridge tube of the bridge circuit 110. At this time, the power supply charges the energy storage capacitor C6 of the driver chip of the upper bridge tube. At the same time, the drive signal of the lower bridge tube also charges the capacitor C3. This process realizes the drive power supply of the upper bridge tube and the negative voltage power supply of the lower bridge tube; then turn off the lower bridge tube and turn on the upper bridge tube. After turning on the upper bridge tube, the driver chip charges the negative voltage capacitor. After the above method, the following can be obtained: Fig. 9 The optimized waveform shown in the figure can quickly achieve negative pressure startup when the switching pulse is output.

[0091] Based on the overall structure of the negative voltage driving circuit of the switch tube in each of the above-mentioned embodiments, various embodiments of the control method of the negative voltage driving circuit of the switch tube of the present application are respectively proposed below.

[0092] It should be noted that the steps of the control method of the negative voltage driving circuit of the switch tube in the embodiment of the present application correspond to the application scenario of the negative voltage driving circuit of the switch tube, that is, the steps of the control method corresponding to the negative voltage driving circuit of the switch tube in different application scenarios may also be different, and the specific steps are as follows:

[0093] like Figure 3 As shown, Figure 3 This is a flow chart of a control method for a switch tube negative voltage driving circuit provided by an embodiment of the present application when applied to a bridge inverter circuit. The control method for the switch tube negative voltage driving circuit may include but is not limited to step S310 and step S320.

[0094] Step S310, turning on the lower bridge tube in the bridge arm to charge the first energy storage device corresponding to the upper bridge tube, and charging the second energy storage device corresponding to the lower bridge tube;

[0095] Step S320: turning off the lower bridge tube in the bridge arm, and turning on the upper bridge tube in the bridge arm, so as to charge the second energy storage device corresponding to the upper bridge tube.

[0096] In one embodiment, since the first energy storage device corresponding to the lower bridge tube is arranged between the power supply and the ground, the first energy storage device corresponding to the lower bridge tube will always store energy, so the embodiment of the present application can directly start the driving unit corresponding to the lower bridge tube and output a high level through the first output terminal, and drive the lower bridge tube in the bridge arm to be turned on by the second energy storage device corresponding to the lower bridge tube, and at the same time, the second energy storage device corresponding to the lower bridge tube can be charged; at the same time, after the lower bridge tube in the bridge arm is turned on, a charging circuit based on the first energy storage device corresponding to the upper bridge tube will be formed, so that the first energy storage device corresponding to the upper bridge tube can also be charged; then, the lower bridge tube is turned off and the upper bridge tube is turned on. The embodiment of the present application can start the driving unit corresponding to the upper bridge tube and output a high level through the first output terminal, and drive the upper bridge tube in the bridge arm to be turned on by the second energy storage device corresponding to the upper bridge tube, so that the second energy storage device corresponding to the upper bridge tube can be charged.

[0097] In addition, if Figure 4 , Figure 4 yes Figure 3 The specific flow chart of step S310 and step S320 in the control method of the negative voltage driving circuit of the switching tube is shown. Regarding the above-mentioned step S310 and step S320, it can specifically include but is not limited to step S410 and step S420.

[0098] Step S410, turning on the first lower bridge tube and the second lower bridge tube to charge the first energy storage device corresponding to the upper bridge tube, and charging the second energy storage device corresponding to the lower bridge tube;

[0099] Step S420 , turning off the first lower bridge tube and the second lower bridge tube, and turning on the first upper bridge tube and the second upper bridge tube, so as to charge the second energy storage device corresponding to the upper bridge tube.

[0100] Based on the above Figure 3 to Figure 4 The method steps are as follows: Fig.10 As shown in the waveform on the left, Fig.10 This is a driving timing diagram of a switch tube negative voltage drive circuit provided by an embodiment of the present application when applied to a bridge inverter circuit. For a bridge inverter circuit, the switch tubes Q3 and Q4 can be turned on first to charge the energy storage capacitors C6 and C7 of the driver chip of the upper bridge tube at the same time. At this time, both ends of the load are connected to the ground, and there is no effect on the power supply and the circuit. Then turn off the switch tubes Q3 and Q4, turn on the switch tubes Q1 and Q2 to charge the switch tube negative voltage drive capacitors C1 and C2. At this time, both ends of the load are connected to the P+ of the power supply, and there is no effect on the power supply and the circuit. At this point, all capacitors have completed charging and entered normal operating state.

[0101] In addition, in one embodiment, the control method of the embodiment of the present application also includes but is not limited to the following steps: obtaining load parameters; when the load parameters are greater than or equal to a first predetermined value, alternately turning on and off the upper bridge tube and the lower bridge tube in the bridge arm according to a first predetermined period.

[0102] Specifically, Fig.10 As shown in the waveform on the right side of , in the high-speed control mode, the upper bridge tube and the lower bridge tube are alternately turned on and off, and the operation is repeated based on the first predetermined cycle. For example, when the switch tubes Q1 and Q2 are in the on state, the switch tubes Q3 and Q4 are in the off state; when the switch tubes Q1 and Q2 are in the off state, the switch tubes Q3 and Q4 are in the on state.

[0103] It is worth noting that, since the size of the load parameter will correspond to different control modes, when the load parameter changes, the embodiment of the present application can switch the control mode.

[0104] It can be understood that the above-mentioned load parameters may be current parameters, power parameters, torque parameters, speed parameters, or other types of parameters. The embodiment of the present application does not specifically limit the types of the above-mentioned load parameters.

[0105] For example, in the case where the load parameter is a current parameter, when the current parameter is less than a first predetermined value, the embodiment of the present application may execute the following: Fig.10 The bridge inverter mode shown in the waveform on the left; when the current parameter is equal to or greater than the first predetermined value, the embodiment of the present application can execute the following Fig.10The high-speed control mode shown in the waveform on the right. Alternatively, for the switching situation, when the current parameter changes from less than the first predetermined value to equal to or greater than the first predetermined value, the embodiment of the present application can respond as follows Fig.10 The bridge inverter mode shown in the left waveform switches to Fig.10 The high-speed control mode shown in the waveform on the right; when the current parameter changes from being equal to or greater than the first predetermined value to being less than the first predetermined value, the embodiment of the present application can respond as follows Fig.10 The high-speed control mode shown in the waveform on the right is switched to Fig.10 The bridge inverter mode is shown in the waveform on the left.

[0106] In addition, it can be understood that the above-mentioned first predetermined value can be obtained according to the real-time status of the circuit, or can be pre-set, and the embodiment of the present application does not specifically limit the numerical value of the first predetermined value.

[0107] In addition, it can be understood that the above-mentioned first predetermined period can be obtained according to the real-time status of the circuit, or can be pre-set. The embodiment of the present application does not specifically limit the duration of the first predetermined period.

[0108] like Figure 5 As shown, Figure 5 This is a flow chart of a control method for a switch tube negative voltage drive circuit provided by an embodiment of the present application when it is applied to a synchronous rectification circuit or a totem pole power correction circuit; the control method for the switch tube negative voltage drive circuit may include but is not limited to step S510 and step S520.

[0109] Step S510, sequentially turning on the lower bridge tube in each bridge arm to charge the first energy storage device corresponding to the upper bridge tube, and to charge the second energy storage device corresponding to the lower bridge tube;

[0110] Step S520 , sequentially turning on the lower bridge tube in one of the bridge arms and the upper bridge tube in the other bridge arm to charge the second energy storage device corresponding to the upper bridge tube.

[0111] In addition, if Figure 6 As shown, Figure 6 yes Figure 5 The specific flow chart of step S510 in the control method of the negative voltage driving circuit of the switching tube shown in the figure; regarding the sequentially turning on the lower bridge tube in each bridge arm in the above step S510, it may include but is not limited to step S610 and step S620.

[0112] Step S610: When the voltage of the first intermediate connection point is a positive voltage, the second lower bridge tube is turned on;

[0113] Step S620: When the voltage of the second middle connection point is a positive voltage, the second lower bridge tube is turned off and the first lower bridge tube is turned on.

[0114] In addition, if Figure 7 As shown, Figure 7 yes Figure 5 The specific flow chart of step S520 in the control method of the negative voltage driving circuit of the switching tube shown in the figure; regarding the sequentially turning on the lower bridge tube in one bridge arm and the upper bridge tube in the other bridge arm in the above step S520, it may include but is not limited to step S710 and step S720.

[0115] Step S710: When the voltage of the first intermediate connection point is a positive voltage again, the first upper bridge tube and the second lower bridge tube are turned on;

[0116] Step S720: When the voltage of the second middle connection point is a positive voltage again, the second upper bridge tube and the first lower bridge tube are turned on.

[0117] Based on the above Figures 5 to 7 The method steps are as follows: Fig.11 As shown in the waveform on the left, Fig.11 This is a driving timing diagram of a switch tube negative voltage drive circuit provided by an embodiment of the present application when it is applied to a synchronous rectification circuit or a totem pole power correction circuit. For a synchronous rectification circuit or a totem pole power correction circuit, when the L line is positive, the switch tube Q4 is controlled to be turned on, and the switch tube driver chip energy storage capacitor C7 is charged, and the switch tube negative voltage drive capacitor C4 is charged. When the N line is positive, turn off Q4 and turn on Q3. At this time, the switch tube driver chip energy storage capacitor C6 is charged, and the switch tube negative voltage drive capacitor C3 is charged. When the L line is positive for the second time, turn on Q1 and Q4, and the switch tube negative voltage drive capacitor C1 is charged, and the switch tube driver chip energy storage capacitor C7 is charged. When the N line is positive for the second time, turn on Q2 and Q3, and the switch tube negative voltage drive capacitor C3 is charged, and the switch tube driver chip energy storage capacitor C6 is charged. At this point, all capacitors have completed charging and entered normal operation.

[0118] In addition, in one embodiment, the control method of the embodiment of the present application also includes but is not limited to the following steps: obtaining a load parameter; when the load parameter is greater than or equal to a second predetermined value, alternately turning on and off the upper bridge tube and the lower bridge tube in one of the bridge arms according to a second predetermined period.

[0119] At the same time, when the load parameter is greater than or equal to the second predetermined value, the embodiment of the present application will also turn on the lower bridge tube and the upper bridge tube in the other bridge arm in sequence, specifically in the following way: when the voltage of the first intermediate connection point is a positive voltage, the second lower bridge tube is turned on; when the voltage of the second intermediate connection point is a positive voltage, the second lower bridge tube is turned off and the second upper bridge tube is turned on.

[0120] Specifically, Fig.11 As shown in the waveform on the right side of , in the high-speed control mode, the switch tubes Q1 and Q3 are alternately turned on and off, and the operation is repeated in the second predetermined cycle. At the same time, when the L line is positive, the switch tube Q4 is controlled to be turned on and the switch tube Q2 is controlled to be turned off. When the N line is positive, the switch tube Q2 is controlled to be turned off and the switch tube Q4 is controlled to be turned on.

[0121] It is worth noting that, since the size of the load parameter will correspond to different control modes, when the load parameter changes, the embodiment of the present application can switch the control mode.

[0122] It can be understood that the above-mentioned load parameters may be current parameters, power parameters, torque parameters, speed parameters, or other types of parameters. The embodiment of the present application does not specifically limit the types of the above-mentioned load parameters.

[0123] For example, in the case where the load parameter is a current parameter, when the current parameter is less than the second predetermined value, the embodiment of the present application may execute the following steps: Fig.11 The synchronous rectification mode shown in the waveform on the left; when the current parameter is equal to or greater than the second predetermined value, the embodiment of the present application can perform the following steps: Fig.11 The high-speed control mode shown in the waveform on the right. Alternatively, for the switching situation, when the current parameter changes from less than the second predetermined value to equal to or greater than the second predetermined value, the embodiment of the present application can respond as follows Fig.11 The synchronous rectification mode shown in the left waveform switches to Fig.11 The high-speed control mode shown in the waveform on the right; when the current parameter changes from being equal to or greater than the second predetermined value to being less than the second predetermined value, the embodiment of the present application can respond as follows Fig.11 The high-speed control mode shown in the waveform on the right is switched to Fig.11 The synchronous rectification mode is shown in the left waveform.

[0124] In addition, it can be understood that the above-mentioned second predetermined value can be obtained according to the real-time status of the circuit, or can be pre-set, and the embodiment of the present application does not specifically limit the numerical value of the second predetermined value.

[0125] In addition, it can be understood that the above-mentioned second predetermined period can be set according to the real-time status of the circuit, or can be pre-set. The embodiment of the present application does not specifically limit the duration of the second predetermined period.

[0126] Based on the switching tube negative voltage driving circuit and control method thereof of the above-mentioned embodiments, various embodiments of the controller, electronic circuit, air conditioner and computer-readable storage medium of the present application are respectively proposed below.

[0127] like Fig.12 As shown, Fig.12 2 is a schematic diagram of a controller for executing a control method for a negative voltage driving circuit of a switching tube provided by an embodiment of the present application. The controller 200 implemented in the present application includes: a processor 210, a memory 220, and a computer program stored in the memory 220 and executable on the processor 210, wherein: Fig.12 In the figure, a processor 210 and a memory 220 are taken as an example.

[0128] The processor 210 and the memory 220 may be connected via a bus or other means. Fig.12 The example of connecting through bus is taken in the following.

[0129] The memory 220, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 220 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 220 may optionally include a memory 220 remotely arranged relative to the processor 210, and these remote memories 220 may be connected to the controller 200 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0130] Those skilled in the art will understand that Fig.12 The device structure shown in the figure does not constitute a limitation on the controller 200, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0131] exist Fig.12 In the controller 200 shown, the processor 210 can be used to call the control program of the switch tube negative voltage driving circuit stored in the memory 220, so as to implement the control method of the switch tube negative voltage driving circuit described above. Specifically, the non-transient software program and instructions required to implement the control method of the switch tube negative voltage driving circuit described above are stored in the memory 220, and when executed by the processor 210, the control method of the switch tube negative voltage driving circuit described above is executed.

[0132] It is worth noting that since the controller 200 of the embodiment of the present application can execute the control method of the negative voltage driving circuit of the switch tube in any of the above-mentioned embodiments, the specific implementation method and technical effects of the controller 200 of the embodiment of the present application can refer to the specific implementation method and technical effects of the control method of the negative voltage driving circuit of the switch tube in any of the above-mentioned embodiments.

[0133] In addition, an embodiment of the present application further provides an electronic circuit, including the negative voltage driving circuit of the switch tube of any of the above embodiments.

[0134] Since the embodiment of the present application adds a negative voltage stabilizing unit between the driving unit and the bridge tube, the bridge tube is controlled to be turned on and the negative voltage stabilizing unit is charged when the driving unit outputs a high level, so that the negative voltage stabilizing unit can drive the bridge tube to a negative voltage when the driving unit outputs a low level to quickly turn off the bridge tube. Therefore, the embodiment of the present application is different from the existing method of using a switching power supply to directly output a negative voltage to drive the switching tube to a negative voltage. Therefore, the embodiment of the present application can connect the input sides of multiple driving modules to the same power supply, so that it is not restricted by the high-voltage electrical clearance and creepage distance requirements, thereby realizing the miniaturization of the power supply and electronic control.

[0135] In addition, the lower bridge tube of the bridge circuit can be turned on first. At this time, the power supply charges the energy storage capacitor of the driver chip of the upper bridge tube. At the same time, the driving signal of the lower bridge tube also charges the capacitor. This process realizes the driving power supply of the upper bridge tube and the negative pressure power supply of the lower bridge tube; then turn off the lower bridge tube and turn on the upper bridge tube. After turning on the upper bridge tube, the driver chip charges the negative pressure capacitor. After the above method, an optimized waveform can be obtained, so that negative pressure startup can be quickly achieved when the switch pulse is output.

[0136] It is worth noting that since the electronic circuit of the embodiment of the present application includes the negative voltage driving circuit of the switching tube of any of the above-mentioned embodiments, the specific implementation manner and technical effects of the electronic circuit of the embodiment of the present application can refer to the specific implementation manner and technical effects of the negative voltage driving circuit of the switching tube of any of the above-mentioned embodiments.

[0137] It should be noted that the above-mentioned electronic circuit can be set to different circuit types according to different application scenarios. The electronic circuit of the embodiment of the present application can be a synchronous rectification circuit, a totem pole power factor correction circuit, or a bridge inverter circuit. The embodiment of the present application does not specifically limit the type of electronic circuit.

[0138] In addition, an embodiment of the present application further provides an air conditioner, comprising the negative pressure driving circuit of the switch tube of any of the above embodiments.

[0139] It is worth noting that since the air conditioner of the embodiment of the present application includes the negative pressure driving circuit of the switching tube of the above-mentioned embodiment, the specific implementation manner and technical effects of the air conditioner of the embodiment of the present application can refer to the specific implementation manner and technical effects of the negative pressure driving circuit of the switching tube and its control method in any of the above-mentioned embodiments.

[0140] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the control method of the negative voltage driving circuit of the switching tube. Figures 3 to 7 The method steps in .

[0141] It is worth noting that since the computer-readable storage medium of the embodiment of the present application can execute the control method of the negative voltage driving circuit of the switching tube in any of the above-mentioned embodiments, the specific implementation manner and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation manner and technical effects of the negative voltage driving circuit of the switching tube and its control method in any of the above-mentioned embodiments.

[0142] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0143] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", and "fixed connection" can be a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0144] Although the implementation methods disclosed in this application are as above, the contents are only implementation methods adopted to facilitate understanding of this application, and are not intended to limit this application. Any technician in the field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be defined by the attached claims.

[0145] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions under the shared conditions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A negative voltage driving circuit for a switching tube, characterized in that: include: A bridge circuit, comprising two bridge arms connected in parallel, each of the bridge arms comprising bridge tubes connected in series; A plurality of driving modules, wherein the driving modules and the bridge tubes are connected one by one, and the input sides of all the driving modules are used to be connected to the same power supply; Among them, each of the driving modules includes a driving unit and a negative voltage stabilizing unit, the power supply end of the driving unit is used to connect to the power supply, the first output end of the driving unit is connected to the control end of the bridge tube through the negative voltage stabilizing unit, and the second output end of the driving unit is connected to an output end of the bridge tube.

2. The switch tube negative voltage driving circuit according to claim 1, characterized in that: The driving module further includes a unidirectional conductive unit, wherein a positive electrode of the unidirectional conductive unit is used to be connected to the power supply, and a negative electrode of the unidirectional conductive unit is connected to a power supply terminal of the driving unit.

3. The switch tube negative voltage driving circuit according to claim 1, characterized in that: The driving module also includes a first resistor and a second resistor, one end of the first resistor is connected to the negative voltage stabilizing unit, and the other end is connected to the control end of the bridge tube; one end of the second resistor is connected to the control end of the bridge tube, and the other end is connected to an output end of the bridge tube.

4. The switch tube negative voltage driving circuit according to claim 1, characterized in that: The driving unit includes a driving chip and a first energy storage device, the power supply end of the driving chip is used to connect to the power supply, the first output end of the driving chip is connected to the control end of the bridge tube through the negative voltage stabilizing unit, and the second output end of the driving chip is connected to an output end of the bridge tube; one end of the first energy storage device is connected to the power supply end of the driving chip, and the other end is connected to the second output end of the driving chip.

5. The switch tube negative voltage driving circuit according to claim 4, characterized in that: The negative voltage stabilizing unit includes a second energy storage device and a voltage stabilizing device, one end of the second energy storage device and the voltage stabilizing device are both connected to the first output end of the driving unit, and the other ends of the second energy storage device and the voltage stabilizing device are both connected to the control end of the bridge tube.

6. A control method for a negative voltage driving circuit of a switching tube, characterized in that: Applicable to the switch tube negative voltage driving circuit of claim 5, each of the bridge arms in the switch tube negative voltage driving circuit comprises an upper bridge tube and a lower bridge tube; When the switch tube negative voltage driving circuit is applied to a bridge inverter circuit, the control method includes: Turning on the lower bridge tube in the bridge arm to charge the first energy storage device corresponding to the upper bridge tube, and charging the second energy storage device corresponding to the lower bridge tube; The lower bridge tube in the bridge arm is turned off, and the upper bridge tube in the bridge arm is turned on, so as to charge the second energy storage device corresponding to the upper bridge tube.

7. The control method according to claim 6, characterized in that: The two bridge arms in the switch tube negative voltage driving circuit are respectively a first bridge arm and a second bridge arm, the first bridge arm includes a first upper bridge tube and a first lower bridge tube, and the second bridge arm includes a second upper bridge tube and a second lower bridge tube; The step of turning on the lower bridge tube in the bridge arm includes: turning on the first lower bridge tube and the second lower bridge tube; The shutting off the lower bridge tube in the bridge arm and turning on the upper bridge tube in the bridge arm includes: shutting off the first lower bridge tube and the second lower bridge tube, and turning on the first upper bridge tube and the second upper bridge tube.

8. The control method according to claim 6, characterized in that: After turning on the upper bridge tube in the bridge arm, the control method further includes: Get load parameters; When the load parameter is greater than or equal to a first predetermined value, the upper bridge tube and the lower bridge tube in the bridge arm are alternately turned on and off according to a first predetermined period.

9. A control method for a negative voltage driving circuit of a switching tube, characterized in that: Applied to the switch tube negative voltage driving circuit of claim 5, each of the bridge arms in the switch tube negative voltage driving circuit includes an upper bridge tube and a lower bridge tube; when the switch tube negative voltage driving circuit is applied to a synchronous rectification circuit or a totem pole power correction circuit, the control method includes: Turning on the lower bridge tube in each of the bridge arms in turn to charge the first energy storage device corresponding to the upper bridge tube and to charge the second energy storage device corresponding to the lower bridge tube; The lower bridge tube in one of the bridge arms and the upper bridge tube in the other bridge arm are turned on in sequence to charge the second energy storage device corresponding to the upper bridge tube.

10. The control method according to claim 9, characterized in that: The two bridge arms in the switch tube negative voltage driving circuit are respectively a first bridge arm and a second bridge arm, the first bridge arm includes a first upper bridge tube and a first lower bridge tube, a first intermediate connection point is between the first upper bridge tube and the first lower bridge tube, the second bridge arm includes a second upper bridge tube and a second lower bridge tube, a second intermediate connection point is between the second upper bridge tube and the second lower bridge tube; The step of sequentially turning on the lower bridge tube in each of the bridge arms includes: When the voltage of the first intermediate connection point is a positive voltage, the second lower bridge tube is turned on; When the voltage of the second intermediate connection point is a positive voltage, the second lower bridge tube is turned off, and the first lower bridge tube is turned on.

11. The control method according to claim 10, characterized in that: The step of sequentially turning on the lower bridge tube in one of the bridge arms and the upper bridge tube in another of the bridge arms comprises: When the voltage of the first intermediate connection point becomes a positive voltage again, the first upper bridge tube and the second lower bridge tube are turned on; When the voltage of the second intermediate connection point becomes a positive voltage again, the second upper bridge tube and the first lower bridge tube are turned on.

12. The control method according to claim 9, characterized in that: After sequentially turning on the lower bridge tube in one of the bridge arms and the upper bridge tube in the other bridge arm, the control method further includes: Get load parameters; When the load parameter is greater than or equal to a second predetermined value, the upper bridge tube and the lower bridge tube in one of the bridge arms are alternately turned on and off according to a second predetermined period, and the lower bridge tube and the upper bridge tube in the other bridge arm are turned on in sequence.

13. The control method according to claim 12, characterized in that: The two bridge arms in the switch tube negative voltage driving circuit are respectively a first bridge arm and a second bridge arm, the first bridge arm includes a first upper bridge tube and a first lower bridge tube, a first intermediate connection point is between the first upper bridge tube and the first lower bridge tube, the second bridge arm includes a second upper bridge tube and a second lower bridge tube, a second intermediate connection point is between the second upper bridge tube and the second lower bridge tube; the sequentially turning on the lower bridge tube and the upper bridge tube in another bridge arm comprises: When the voltage of the first intermediate connection point is a positive voltage, the second lower bridge tube is turned on; When the voltage of the second intermediate connection point is a positive voltage, the second lower bridge tube is turned off, and the second upper bridge tube is turned on.

14. A negative voltage driving circuit for a switching tube, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method according to any one of claims 6 to 13 when executing the computer program.

15. An electronic circuit, characterized in that: It comprises the negative voltage driving circuit of the switch tube as claimed in any one of claims 1 to 5 or the negative voltage driving circuit of the switch tube as claimed in claim 14.

16. An air conditioner, characterized in that: It comprises the negative voltage driving circuit of the switch tube as claimed in any one of claims 1 to 5 or the negative voltage driving circuit of the switch tube as claimed in claim 14.

17. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the control method according to any one of claims 6 to 13.

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