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

Abstract

The present application provides a switching tube negative-voltage driving circuit and a control method therefor, an air conditioner and a storage medium, wherein the switching tube negative-voltage driving circuit comprises a bridge circuit and a plurality of driving modules. The bridge circuit comprises two bridge arms, each bridge arm comprising bridge tubes connected in series; the driving modules and the bridge tubes are connected in a manner of corresponding to each other on a one-to-one basis, and input sides of all the driving modules are connected to the same power supply source; and each driving module comprises a driving unit and a negative-voltage voltage stabilizing unit, wherein a power supply end of the driving unit is connected to the power supply source, a first output end of the driving unit is connected to a control end of a bridge tube by means of the negative-voltage voltage stabilizing unit, and a second output end of same is connected to an output end of the bridge tube.

Description

Switch tube negative voltage drive circuit and control method thereof, air conditioner and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311135109.1 filed on September 4, 2023, entitled “Switching tube negative pressure driving circuit and control method thereof, air conditioner and storage medium”, and application number 202322397842.2 filed on September 4, 2023, entitled “Switching tube negative pressure driving circuit, electronic circuit and air conditioner”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of electronic circuits, and in particular to a switching tube negative voltage drive circuit and a control method thereof, an air conditioner, and a storage medium. Background Art

[0004] In the related art, existing negative voltage drive methods for switching tubes often use a switching power supply to output a negative voltage to drive the switching tube. Therefore, in existing bridge circuits, since the bridge circuit includes multiple switching tubes, each switching tube often requires an independent switching power supply winding to be powered. Therefore, existing bridge circuits often require the simultaneous installation of multiple switching power supply windings. Furthermore, because the safety distance between the switching power supply windings must meet the high-voltage electrical clearance and creepage distance requirements, it is difficult to achieve miniaturization of the power supply and electronic control.

[0005] Summary of the Invention

[0006] The present application aims to at least partially solve one of the technical problems existing in the prior art. To this end, the present application proposes a switching tube negative voltage drive circuit and a control method thereof, an air conditioner, and a storage medium.

[0007] In a first aspect, an embodiment of the present application provides a negative voltage driving circuit for a switching tube, comprising:

[0008] A bridge circuit comprising two bridge arms connected in parallel, each of the bridge arms comprising bridge tubes connected in series;

[0009] Multiple driving modules, each of the driving modules and the bridge tubes is connected in a one-to-one correspondence, and the input sides of all the driving modules are used to be connected to the same power supply;

[0010] 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.

[0011] According to some embodiments of the present application, the driving module further includes a unidirectional conductive unit, the positive pole of the unidirectional conductive unit is used to be connected to the power supply, and the negative pole of the unidirectional conductive unit is connected to the power supply end of the driving unit.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] According to some embodiments of the present application, the two bridge arms in the switching 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 connected in series, and the second bridge arm includes a second upper bridge tube and a second lower bridge tube connected in series.

[0016] According to some embodiments of the present application, a first intermediate connection point is between the first upper bridge tube and the first lower bridge tube, and a second intermediate connection point is between the second upper bridge tube and the second lower bridge tube. The first intermediate connection point and the second intermediate connection point are used to connect to an input power supply.

[0017] In a second aspect, an embodiment of the present application provides a control method for a switching tube negative voltage drive circuit, which is applied to the switching tube negative voltage drive circuit of the first aspect above, wherein each bridge arm in the switching tube negative voltage drive circuit includes an upper bridge tube and a lower bridge tube; when the switching tube negative voltage drive circuit is applied to a bridge inverter circuit, the control method includes:

[0018] Turning on the lower bridge tube in the 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;

[0019] 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.

[0020] According to some embodiments of the present application, the two bridge arms in the switching 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 the second bridge arm includes a second upper bridge tube and a second lower bridge tube;

[0021] 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;

[0022] Turning off the lower bridge tube in the bridge arm and turning on the upper bridge tube in the bridge arm includes: 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.

[0023] According to some embodiments of the present application, after turning on the upper bridge transistor in the bridge arm, the control method further includes:

[0024] Get load parameters;

[0025] When the load parameter is greater than or equal to a first predetermined value, the upper bridge transistor and the lower bridge transistor in the bridge arm are alternately turned on and off according to a first predetermined period.

[0026] In addition, an embodiment of the present application provides a control method for a switching tube negative voltage drive circuit, which is applied to the switching tube negative voltage drive circuit of the first aspect above, wherein each bridge arm in the switching tube negative voltage drive circuit includes an upper bridge tube and a lower bridge tube; when the switching tube negative voltage drive circuit is applied to a synchronous rectification circuit or a totem pole power correction circuit, the control method includes:

[0027] Turning on the lower bridge tube in each of the bridge arms in sequence to charge the first energy storage device corresponding to the upper bridge tube and the second energy storage device corresponding to the lower bridge tube;

[0028] 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.

[0029] According to some embodiments of the present application, the two bridge arms in the switching 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 formed 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, and a second intermediate connection point is formed between the second upper bridge tube and the second lower bridge tube; and sequentially turning on the lower bridge tube in each of the bridge arms includes:

[0030] When the voltage of the first intermediate connection point is positive, the second lower bridge tube is turned on;

[0031] 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.

[0032] According to some embodiments of the present application, sequentially turning on the lower bridge transistor in one of the bridge arms and the upper bridge transistor in the other bridge arm includes:

[0033] When the voltage of the first intermediate connection point becomes positive again, the first upper bridge tube and the second lower bridge tube are turned on;

[0034] 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.

[0035] According to some embodiments of the present application, after sequentially turning on the lower bridge transistor in one of the bridge arms and the upper bridge transistor in the other bridge arm, the control method further includes:

[0036] Get load parameters;

[0037] When the load parameter is greater than or equal to a second predetermined value, the upper bridge transistor and the lower bridge transistor in one of the bridge arms are alternately turned on and off according to a second predetermined period, and the lower bridge transistor and the upper bridge transistor in the other bridge arm are turned on in sequence.

[0038] According to some embodiments of the present application, the two bridge arms in the switching 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 formed 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, and a second intermediate connection point is formed between the second upper bridge tube and the second lower bridge tube; and sequentially turning on the lower bridge tube and the upper bridge tube in the other bridge arm includes:

[0039] When the voltage of the first intermediate connection point is positive, the second lower bridge tube is turned on;

[0040] 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.

[0041] 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.

[0042] In a fourth aspect, an embodiment of the present application provides an electronic circuit, comprising the negative voltage driving circuit of the switching tube according to the first aspect or the third aspect.

[0043] In a fifth aspect, an embodiment of the present application provides an air conditioner, comprising the negative voltage driving circuit of the switching tube according to the first aspect or the third aspect.

[0044] 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.

[0045] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are used to provide a 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.

[0047] FIG1 is a schematic structural diagram of a negative voltage driving circuit for a switching tube provided by one embodiment of the present application;

[0048] FIG2 is a schematic structural diagram of a power supply connected to a negative voltage driving circuit for a switching tube according to an embodiment of the present application;

[0049] 3 is a flow chart of a control method for a switch tube negative voltage drive circuit provided by one embodiment of the present application when applied to a bridge inverter circuit;

[0050] FIG4 is a specific flow chart of steps S310 and S320 in the control method of the negative voltage driving circuit of the switching tube shown in FIG3 ;

[0051] 5 is a flow chart of a control method for a switch tube negative voltage drive circuit provided by one embodiment of the present application when the switch tube negative voltage drive circuit is applied to a synchronous rectification circuit or a totem pole power correction circuit;

[0052] FIG6 is a specific flow chart of step S510 in the control method of the negative voltage driving circuit of the switching tube shown in FIG5 ;

[0053] FIG7 is a specific flow chart of step S520 in the control method of the negative voltage driving circuit of the switching tube shown in FIG5 ;

[0054] FIG8 is a waveform diagram of negative pressure startup during the start-up process of a negative pressure driving circuit for a switching tube provided by one embodiment of the present application;

[0055] FIG9 is a waveform diagram of a negative voltage driving circuit for a switching tube provided by one embodiment of the present application after negative voltage startup optimization during the startup process;

[0056] FIG10 is a driving timing diagram of a negative voltage driving circuit for a switching tube provided by one embodiment of the present application when applied to a bridge inverter circuit;

[0057] FIG11 is a driving timing diagram of a negative voltage driving circuit for a switching tube provided by an embodiment of the present application when applied to a synchronous rectification circuit or a totem pole power correction circuit; and

[0058] FIG12 is a schematic structural diagram of a controller for executing a control method for a negative voltage driving circuit of a switching tube provided in one embodiment of the present application. DETAILED DESCRIPTION

[0059] The following describes in detail embodiments of the present application. 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 are not to be construed as limiting the present application.

[0060] In the description of this application, it should be understood that descriptions involving orientations, 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. They are only for the convenience of describing this 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. Therefore, they cannot be understood as limitations on this application.

[0061] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0062] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting 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.

[0063] In some cases, existing negative voltage drive methods for switching transistors often use a switching power supply to output a negative voltage. Therefore, existing bridge circuits often require multiple switching power supply windings to be installed simultaneously, as each switching transistor requires a separate switching power supply winding to power it. Furthermore, the safety spacing between the switching power supply windings must meet high-voltage electrical clearance and creepage distance requirements, making it difficult to miniaturize the power supply and electronic control.

[0064] Based on the above situation, the embodiments of the present application propose a switching tube negative voltage drive circuit and its control method, an air conditioner and a storage medium, aiming to achieve miniaturization of power supply and electronic control.

[0065] The following further describes various embodiments of the negative voltage driving circuit for the switching tube of the present application in conjunction with the accompanying drawings.

[0066] As shown in Figure 1, Figure 1 is a schematic diagram of the structure of a negative voltage drive circuit for a switching tube provided by an embodiment of the present application. The negative voltage drive circuit for a switching 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-to-one, and the input sides of all driving modules 120 are connected to the same power supply.

[0067] 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 the power supply through the power supply end, the driving unit 121 is connected to the control end of the bridge tube through 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 through the second output end.

[0068] 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 drive the bridge tube to a negative voltage when the driving unit 121 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 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.

[0069] 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 control on and off. The embodiments of this application do not specifically limit the structural type of the switching tube.

[0070] It can be understood that the above-mentioned bridge tubes may correspond to the switch tubes Q1 , Q2 , Q3 and Q4 shown in FIG. 1 .

[0071] For example, as shown in Figure 1, when a field effect transistor is used as a bridge transistor, an embodiment of the present application can connect the gate of the field effect transistor to the first output end 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 end of the driving unit 121.

[0072] In addition, it should be noted that the above-mentioned power supply can be in the form of a switching power supply winding as shown in Figure 2, or in other power supply forms. The embodiments of the present application do not specifically limit the structural form of the power supply.

[0073] In one embodiment, as shown in FIG1 , the driving module 120 further includes but is not limited to a unidirectional conductive unit, wherein the positive electrode of the unidirectional conductive unit is used to connect to a power supply, and the negative electrode of the unidirectional conductive unit is connected to the power supply end of the driving unit 121 .

[0074] Specifically, the embodiment of the present application can use the unidirectional conduction unit to unidirectionally conduct the current supplied from the power supply to the driving unit 121. It is understood that the unidirectional conduction unit may include but is not limited to a diode.

[0075] It can be understood that the above-mentioned unidirectional conducting unit may correspond to the diodes D6 and D7 shown in FIG. 1 .

[0076] In one embodiment, as shown in Figure 1, the driving module 120 further 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 stabilization 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.

[0077] It should be noted that the first resistor mentioned above is mainly used to limit the current and reduce the oscillation when the bridge tube is turned on; in addition, the second resistor mentioned above is mainly used to pull down the bridge tube in the off state to release the current.

[0078] It can be understood that the above-mentioned first resistor can correspond to the resistors R1, R2, R3 and R4 shown in Figure 1; the above-mentioned second resistor can correspond to the resistors R5, R6, R7 and R8 shown in Figure 1.

[0079] In one embodiment, as shown in Figure 1, 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.

[0080] Specifically, the first energy storage device is connected between the power supply terminal and the second output terminal of the driver chip, and as the energy storage device of the driver chip, can supply power to the driver chip after energy storage is completed.

[0081] It is understandable that the aforementioned driver chip may correspond to the chip Drive shown in FIG. 1 .

[0082] In addition, it can be understood that the first energy storage device mentioned above may correspond to the capacitors C6, C7, C8 and C9 shown in FIG. 1 .

[0083] In one embodiment, as shown in Figure 1, 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 both 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 both connected to the control end of the bridge tube.

[0084] Specifically, when the driving unit 121 outputs a high level through the first output end, the bridge tube will be driven to conduct through the second energy storage device, and the negative voltage stabilizing unit 122 will be 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. At this time, the voltage across the second energy storage device will be clamped. In addition, when the driving unit 121 outputs a low level through the first output end, since the second energy storage device has been charged, when the driving unit 121 outputs a low level, the negative end of the second energy storage device is loaded on the control end of the bridge tube, and the positive end 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.

[0085] It can be understood that the second energy storage device mentioned above may correspond to the capacitors C1 , C2 , C3 and C4 shown in FIG. 1 .

[0086] In addition, it can be understood that the above-mentioned voltage stabilizing device may correspond to the voltage stabilizing diode D1 shown in FIG. 1 .

[0087] In one embodiment, as shown in FIG1 , the two bridge arms in the negative voltage driving circuit of the switching tube 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.

[0088] In one embodiment, as shown in FIG1 , a first intermediate connection point L is formed between the first upper bridge tube Q1 and the first lower bridge tube Q3 , and a second intermediate connection point N is formed 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.

[0089] 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 embodiments of the present application.

[0090] 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.

[0091] In one embodiment, as shown in FIG1 , the negative voltage drive circuit for the switching tube can be composed of four switching tubes Q1 to Q4 forming a bridge circuit 110. This circuit can implement a totem pole circuit for input voltage rectification and power factor correction, as well as a full-bridge inverter circuit. Switching tube Q1 is the upper bridge tube. The driving power supply for this switching tube in the circuit is provided by diode D6, which implements 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 capacitor C6 through diode D6, capacitor C6, and switching tube Q3. When the driver chip Drive outputs a high level, the driver chip Drive drives the switching tube Q1 through capacitor C1 and resistor R1. When the voltage on capacitor C1 exceeds the voltage Uz of the Zener diode D1, current flows through the Zener diode D1, and the voltage across the capacitor is clamped to the power supply Uz. When the driver chip Drive outputs a low level, capacitor C1 drives the switching tube Q1 off through the driver chip Drive and resistor R1. It should be noted that when the driver 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 driver chip Drive. At this time, the voltage between the gate and source of the switch tube Q1 is -Uz, thereby realizing negative voltage drive.

[0092] It should be noted that, regarding the switching tubes Q2 to Q4 shown in FIG. 1 , their negative voltage driving principles are consistent with that of the switching tube Q1 .

[0093] As shown in Figure 8, Figure 8 is a schematic diagram of the waveforms of the negative voltage start-up process of the negative voltage drive circuit of the switching tube provided by one embodiment of the present application. After multiple drive pulses, the positive and negative voltages applied to the gate and source of the switching tube can reach stability, thereby achieving normal negative voltage drive.

[0094] However, there are obviously certain deficiencies in the waveform in Figure 8, namely, 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 optimized waveform diagram shown in Figure 9 can be obtained, so that negative voltage startup can be quickly achieved when the switching pulse is output.

[0095] Based on the overall structure of the negative voltage driving circuit for the switching tube in each of the above embodiments, various embodiments of the control method of the negative voltage driving circuit for the switching tube of the present application are respectively proposed below.

[0096] It should be noted that the steps of the control method of the switching tube negative voltage driving circuit in the embodiment of the present application correspond to the application scenarios of the switching tube negative voltage driving circuit. That is, the steps of the control method corresponding to the switching tube negative voltage driving circuit in different application scenarios may also be different. The specific steps are as follows:

[0097] As shown in Figure 3, Figure 3 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 applied to a bridge inverter circuit. The control method for the switch tube negative voltage drive circuit may include but is not limited to step S310 and step S320.

[0098] 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 the second energy storage device corresponding to the lower bridge tube;

[0099] Step S320 , turning off the lower bridge transistor in the bridge arm and turning on the upper bridge transistor in the bridge arm to charge the second energy storage device corresponding to the upper bridge transistor.

[0100] 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 end, and drive the lower bridge tube in the bridge arm to be turned on through 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, since 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, thereby also being able to charge the first energy storage device corresponding to the upper bridge tube; 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 end, and drive the upper bridge tube in the bridge arm to be turned on through the second energy storage device corresponding to the upper bridge tube, thereby being able to charge the second energy storage device corresponding to the upper bridge tube.

[0101] 4 is a specific flow chart of steps S310 and S320 in the control method of the negative voltage driving circuit of the switching tube shown in FIG3. The above steps S310 and S320 may specifically include but are not limited to steps S410 and S420.

[0102] Step S410: Turning on the first lower bridge transistor and the second lower bridge transistor to charge the first energy storage device corresponding to the upper bridge transistor and the second energy storage device corresponding to the lower bridge transistor;

[0103] Step S420 , turning off the first lower bridge transistor and the second lower bridge transistor, and turning on the first upper bridge transistor and the second upper bridge transistor, so as to charge the second energy storage device corresponding to the upper bridge transistor.

[0104] Based on the method steps of Figures 3 to 4 above, as shown in the waveform on the left side of Figure 10, Figure 10 is a driving timing diagram of the switch tube negative voltage drive circuit provided by an embodiment of the present application when it is applied to a bridge inverter circuit. For the bridge inverter circuit, you can first turn on the switch tube Q3 and the switch tube Q4 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 tube Q3 and the switch tube Q4, turn on the switch tube Q1 and the switch tube 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.

[0105] 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 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.

[0106] Specifically, as shown in the waveform on the right side of Figure 10, 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 a 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.

[0107] 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.

[0108] It can be understood that the above-mentioned load parameters can be current parameters, power parameters, torque parameters, speed parameters, or other types of parameters. The embodiments of the present application do not specifically limit the types of the above-mentioned load parameters.

[0109] For example, in the case where the load parameter is a current parameter, when the current parameter is less than the first predetermined value, the embodiment of the present application can execute the bridge inverter mode as shown in the waveform on the left of Figure 10; when the current parameter is equal to or greater than the first predetermined value, the embodiment of the present application can execute the high-speed control mode as shown in the waveform on the right of Figure 10. 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 by switching the bridge inverter mode as shown in the waveform on the left of Figure 10 to the high-speed control mode as shown in the waveform on the right of Figure 10; when the current parameter changes from equal to or greater than the first predetermined value to less than the first predetermined value, the embodiment of the present application can respond by switching the high-speed control mode as shown in the waveform on the right of Figure 10 to the bridge inverter mode as shown in the waveform on the left of Figure 10.

[0110] In addition, it is understandable that the first predetermined value mentioned above can be obtained by setting according to the real-time state of the circuit, or can be pre-set. The embodiment of the present application does not specifically limit the numerical value of the first predetermined value.

[0111] 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 embodiments of the present application do not specifically limit the duration of the first predetermined period.

[0112] As shown in Figure 5, Figure 5 is a flowchart of a control method for a switching tube negative voltage driving 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 of the switching tube negative voltage driving circuit may include but is not limited to step S510 and step S520.

[0113] Step S510: Turning on the lower bridge transistors in each bridge arm in sequence to charge the first energy storage device corresponding to the upper bridge transistor and the second energy storage device corresponding to the lower bridge transistor;

[0114] Step S520 : Turning on the lower bridge transistor in one of the bridge arms and the upper bridge transistor in the other bridge arm in sequence to charge the second energy storage device corresponding to the upper bridge transistor.

[0115] In addition, as shown in FIG6 , FIG6 is a specific flow chart of step S510 in the control method of the negative voltage driving circuit of the switching tube shown in FIG5 ; 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 .

[0116] Step S610: When the voltage of the first intermediate connection point is positive, turn on the second lower bridge transistor;

[0117] Step S620: When the voltage of the second intermediate connection point is a positive voltage, the second low bridge tube is turned off and the first low bridge tube is turned on.

[0118] In addition, as shown in Figure 7, Figure 7 is a specific flow chart of step S520 in the control method of the switching tube negative voltage drive circuit shown in Figure 5; regarding the sequential turning on of 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.

[0119] Step S710: When the voltage of the first intermediate connection point becomes positive again, the first upper bridge transistor and the second lower bridge transistor are turned on;

[0120] Step S720: When the voltage of the second intermediate connection point becomes positive again, the second upper bridge transistor and the first lower bridge transistor are turned on.

[0121] Based on the method steps of Figures 5 to 7 above, as shown in the waveform on the left side of Figure 11, Figure 11 is a driving timing diagram of the switch tube negative voltage drive circuit provided by one embodiment of the present application when it is applied to a synchronous rectification circuit or a totem pole power correction circuit. For the synchronous rectification circuit or the totem pole power correction circuit, when the L line is positive, the switch tube Q4 is controlled to be turned on, and the energy storage capacitor C7 of the switch tube driver chip is charged, and the negative voltage drive capacitor C4 of the switch tube is charged. When the N line is positive, Q4 is turned off and Q3 is turned on. At this time, the energy storage capacitor C6 of the switch tube driver chip is charged, and the negative voltage drive capacitor C3 of the switch tube is charged. When the L line is positive for the second time, Q1 and Q4 are turned on. At this time, the negative voltage drive capacitor C1 of the switch tube is charged, and the energy storage capacitor C7 of the switch tube driver chip is charged. When the N line is positive for the second time, Q2 and Q3 are turned on. At this time, the negative voltage drive capacitor C3 of the switch tube is charged, and the energy storage capacitor C6 of the switch tube driver chip is charged. At this point, all capacitors are charged and enter normal operation.

[0122] 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.

[0123] 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.

[0124] Specifically, as shown in the waveform on the right side of Figure 11, in the high-speed control mode, the switch tubes Q1 and Q3 are alternately turned on and off, and the operation is repeated for a second predetermined period. 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.

[0125] 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.

[0126] It can be understood that the above-mentioned load parameters can be current parameters, power parameters, torque parameters, speed parameters, or other types of parameters. The embodiments of the present application do not specifically limit the types of the above-mentioned load parameters.

[0127] 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 can now execute the synchronous rectification mode as shown in the waveform on the left of Figure 11; when the current parameter is equal to or greater than the second predetermined value, the embodiment of the present application can now execute the high-speed control mode as shown in the waveform on the right of Figure 11. 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 by switching the synchronous rectification mode as shown in the waveform on the left of Figure 11 to the high-speed control mode as shown in the waveform on the right of Figure 11; when the current parameter changes from equal to or greater than the second predetermined value to less than the second predetermined value, the embodiment of the present application can respond by switching the high-speed control mode as shown in the waveform on the right of Figure 11 to the synchronous rectification mode as shown in the waveform on the left of Figure 11.

[0128] 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. The embodiments of the present application do not specifically limit the numerical value of the second predetermined value.

[0129] 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 it can be pre-set. The embodiments of the present application do not specifically limit the duration of the second predetermined period.

[0130] Based on the switching tube negative voltage driving circuit and control method thereof in 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.

[0131] As shown in Figure 12, Figure 12 is a schematic diagram of the structure of a controller for executing a control method for a negative voltage drive circuit of a switching tube provided by one 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. Figure 12 uses one processor 210 and one memory 220 as an example.

[0132] The processor 210 and the memory 220 may be connected via a bus or other means. FIG12 takes the bus connection as an example.

[0133] The memory 220 is a non-transitory computer-readable storage medium that 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 located 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.

[0134] Those skilled in the art will understand that the device structure shown in FIG12 does not constitute a limitation on the controller 200 , and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0135] In the controller 200 shown in FIG12 , the processor 210 can be configured to call a control program for the negative voltage drive circuit for a switching tube stored in the memory 220, thereby implementing the aforementioned control method for the negative voltage drive circuit for a switching tube. Specifically, the non-transient software program and instructions required to implement the control method for the negative voltage drive circuit for a switching tube in the aforementioned embodiment are stored in the memory 220. When executed by the processor 210, the control method for the negative voltage drive circuit for a switching tube in the aforementioned embodiment is performed.

[0136] 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 switching tube of 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 switching tube of any of the above-mentioned embodiments.

[0137] In addition, an embodiment of the present application further provides an electronic circuit, comprising the negative voltage driving circuit of the switching tube according to any of the above embodiments.

[0138] 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.

[0139] Alternatively, the lower bridge transistor of the bridge circuit can be turned on first. This allows the power supply to charge the energy storage capacitor of the driver chip of the upper bridge transistor, while the drive signal from the lower bridge transistor also charges the capacitor. This process provides both power to the upper bridge transistor and negative voltage to the lower bridge transistor. The lower bridge transistor is then turned off and the upper bridge transistor is turned on. Once the upper bridge transistor is turned on, the driver chip charges the negative voltage capacitor. This approach yields an optimized waveform, enabling rapid negative voltage startup during the output of the switching pulse.

[0140] 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 methods and technical effects of the electronic circuit of the embodiment of the present application can refer to the specific implementation methods and technical effects of the negative voltage driving circuit of the switching tube of any of the above-mentioned embodiments.

[0141] It should be noted that the above-mentioned electronic circuits can be set to different circuit types according to different application scenarios. The electronic circuits of the embodiments of the present application can be synchronous rectification circuits, totem pole power factor correction circuits, or bridge inverter circuits. The embodiments of the present application do not specifically limit the types of electronic circuits.

[0142] In addition, an embodiment of the present application further provides an air conditioner, comprising the negative voltage driving circuit of the switching tube according to any of the above embodiments.

[0143] It is worth noting that since the air conditioner of the embodiment of the present application includes the switching tube negative voltage driving circuit 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 switching tube negative voltage driving circuit and its control method of any of the above-mentioned embodiments.

[0144] In addition, one embodiment of the present application further provides a computer-readable storage medium storing computer-executable instructions for executing the aforementioned method for controlling a negative voltage drive circuit for a switching tube. For example, the method steps described above in Figures 3 to 7 are executed.

[0145] It is worth noting that since the computer-readable storage medium of the embodiments of the present application can execute the control method of the switching tube negative voltage driving circuit of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer-readable storage medium of the embodiments of the present application can refer to the specific implementation methods and technical effects of the switching tube negative voltage driving circuit and its control method of any of the above-mentioned embodiments.

[0146] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, 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 can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically includes 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.

[0147] In the description of the embodiments of this application, unless otherwise expressly specified or limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection. The terms "installation," "connection," and "fixed connection" can refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0148] Although the embodiments disclosed in this application are as described above, the contents are only embodiments adopted to facilitate understanding of this application and are not intended to limit this application. Any person skilled in the art to which this application belongs may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this application. However, the scope of patent protection of this application shall still be defined by the attached claims.

[0149] 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 art can also make various equivalent modifications or substitutions under the shared conditions that do not violate 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, comprising: A bridge circuit, comprising two bridge arms connected in parallel, each of the bridge arms comprising bridge tubes connected in series; as well as 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, wherein: 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 negative voltage driving circuit for a switching tube according to claim 1 or 2, wherein: 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 negative voltage driving circuit for a switching tube according to any one of claims 1 to 3, wherein: 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 negative voltage driving circuit for a switching tube according to claim 4, wherein: 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. The switch tube negative voltage driving circuit according to any one of claims 1 to 5, wherein: 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 connected in series, and the second bridge arm includes a second upper bridge tube and a second lower bridge tube connected in series.

7. The switch tube negative voltage driving circuit according to claim 6, wherein: A first intermediate connection point is between the first upper bridge tube and the first lower bridge tube, a second intermediate connection point is between the second upper bridge tube and the second lower bridge tube, and the first intermediate connection point and the second intermediate connection point are used to connect to an input power supply.

8. A control method for a switch tube negative voltage driving circuit, applied to the switch tube negative voltage driving circuit according to claim 5, wherein 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 bridge inverter circuit, the control method comprises: 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; as well as 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.

9. The control method according to claim 8, wherein: 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.

10. The control method according to claim 8 or 9, wherein: After turning on the upper bridge tube in the bridge arm, the control method further includes: Obtaining load parameters; and 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.

11. A control method for a switch tube negative voltage driving circuit, applied to the switch tube negative voltage driving circuit according to claim 5, wherein 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 comprises: 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; as well as 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.

12. The control method according to claim 11, wherein: 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; 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, turning on the second lower bridge tube; and 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.

13. The control method according to claim 12, wherein: 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; and 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.

14. The control method according to any one of claims 11 to 13, 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 comprises: Get load parameters; as well as 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.

15. The control method according to claim 14, wherein: 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, turning on the second lower bridge tube; and 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.

16. 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 according to any one of claims 8 to 15 when executing the computer program.

17. An electronic circuit, comprising the switch tube negative voltage driving circuit according to any one of claims 1 to 7 or the switch tube negative voltage driving circuit according to claim 16.

18. An air conditioner, comprising the negative voltage driving circuit for a switching tube as claimed in any one of claims 1 to 7 or the negative voltage driving circuit for a switching tube as claimed in claim 16.

19. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method according to any one of claims 8 to 15.

Images