Driving circuit and air conditioner

Abstract

The invention discloses a driving circuit and an air conditioner, and the driving circuit comprises a pulse conversion circuit, the input end of the pulse conversion circuit is used for accessing an external pulse signal, and the pulse conversion circuit is also used for outputting a control signal of a first voltage when the accessed pulse signal is a first level, and outputting a control signal of a second voltage when the pulse signal is a second level. Outputting a control signal of the second voltage; the control end of the first driving branch is electrically connected with the upper bridge arm, and the controlled end of the first driving branch is connected with the first output end of the pulse conversion circuit; the control end of the second driving branch is electrically connected with the lower bridge arm, and the controlled end of the second driving branch is connected with the second output end of the pulse conversion circuit; the first driving branch and the second driving branch are used for alternately driving the upper bridge arm and the lower bridge arm to be conducted under the control of a control signal so as to output a power supply voltage with a corresponding waveform through the output terminal; according to the technical scheme, the problems that in the prior art, a drive circuit is complex in design, and excessive external interfaces are occupied are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a driving circuit and an air conditioner. Background Art

[0002] At present, in the existing air conditioner motor driving scheme, the upper and lower bridge arms of the motor cannot be turned on at the same time when driving, but require the same effective level for driving. Therefore, two complementary square waves are usually set as the driving signal output. However, in motor control, according to the number of phases of the power supply, the motor may have multiple sets of bridge arms. This leads to the need to set up multiple driving circuits during circuit design, which makes the circuit design complicated, increases the number of components, and occupies more external interfaces, resulting in a waste of interface resources. Summary of the invention

[0003] The main purpose of the present invention is to provide a driving circuit and an air conditioner, aiming to solve the problem in the prior art that the driving circuit is complex in design and occupies too many external interfaces.

[0004] To achieve the above object, the driving circuit proposed in the present invention is applied to an air conditioner, the air conditioner comprises an output terminal, and an upper bridge arm and a lower bridge arm respectively connected to the output terminal, the driving circuit comprises:

[0005] A pulse conversion circuit, wherein the input end is used to receive an external pulse signal, and the pulse conversion circuit is further used to output a control signal of a first voltage when the received pulse signal is at a first level, and to output a control signal of a second voltage when the pulse signal is at a second level; wherein the first level is different from the second level, and the first voltage is different from the second voltage;

[0006] A first driving branch, a control end of which is electrically connected to the upper bridge arm, and a controlled end of which is connected to the first output end of the pulse conversion circuit;

[0007] A second driving branch, a control end of which is electrically connected to the lower bridge arm, and a controlled end of which is connected to the second output end of the pulse conversion circuit;

[0008] The first driving branch and the second driving branch are used to alternately drive the upper bridge arm and the lower bridge arm to conduct under the control of the control signal, so as to output a supply voltage with a corresponding waveform through the output terminal.

[0009] In some embodiments, the pulse conversion circuit includes:

[0010] a level conversion circuit, whose output end is the first output end of the pulse conversion circuit, and is used to output a control signal of a first voltage to the first driving branch when receiving a first level;

[0011] a pulse distribution circuit, whose input end is the input end of the pulse conversion circuit, whose first output end is connected to the controlled end of the level conversion circuit, and whose second output end is the second output end of the pulse conversion circuit, and is used to output the received first level to the level conversion circuit, and output the received second level to the second driving branch;

[0012] The voltage value of the second level is the same as the voltage value of the second voltage.

[0013] In some embodiments, the level conversion circuit includes:

[0014] A voltage source circuit, whose ground terminal is used to connect to the output terminal, and the voltage source circuit is also used to output a third voltage;

[0015] a voltage processing circuit, wherein a controlled end of the voltage processing circuit is the controlled end of the level conversion circuit, an output end of the voltage processing circuit is the output end of the level conversion circuit, and an input end of the voltage processing circuit is connected to the output end of the voltage source circuit;

[0016] The voltage processing circuit is further used to receive the third voltage under the control of the first level, convert it, and output a control signal corresponding to the first voltage;

[0017] The third voltage is different from the first voltage and the second voltage.

[0018] In some embodiments, the air conditioner further comprises a first power terminal connected to the upper bridge arm, and a second power terminal connected to the lower bridge arm, and the voltage source circuit comprises:

[0019] A first voltage source, whose ground terminal is connected to the second power terminal, and whose output terminal is used to output the first power;

[0020] A capacitor, a first end of which is connected to the input end of the voltage processing circuit, and a second end of which is used to connect to the output terminal;

[0021] A diode has a cathode connected to the first end of the capacitor and an anode connected to the output end of the first voltage source.

[0022] In some embodiments, when the lower bridge arm is turned on and the upper bridge arm is turned off, the first voltage source outputs the first power supply, and the first power supply charges the capacitor through the diode;

[0023] When the upper bridge arm is turned on and the lower bridge arm is turned off, under the action of the voltage of the external power supply connected to the second power terminal, the capacitor discharges to the input end of the voltage processing circuit with the third voltage;

[0024] Wherein, the voltage value of the external power supply is the same as the voltage value of the third voltage.

[0025] In some embodiments, the air conditioner further comprises a second power supply terminal connected to the lower bridge arm, and the voltage processing circuit comprises;

[0026] a first switch tube, whose controlled end is the controlled end of the voltage processing circuit, and whose output end is connected to the second power supply terminal via the second driving branch;

[0027] a second switch tube, whose controlled end is connected to the input end of the first switch tube, whose input end is the input end of the voltage processing circuit, and whose output end is connected to the controlled end of the first driving branch;

[0028] A voltage regulator tube, an anode of which is connected to the controlled end of the second switch tube, and a cathode of which is connected to the input end of the second switch tube.

[0029] In some embodiments, when the pulse signal is at the first level, the first switch tube is turned on, and controls the second switch tubes to be turned on, the voltage regulator tube clamps the voltage of the controlled end of the second switch tube, controls the second switch tube to divide the third voltage, and outputs a control signal of the first voltage;

[0030] When the pulse signal is at the second level, the first switch tube is turned off, and the second switch tubes are controlled to be turned off, so that the second switch tubes stop receiving the third voltage;

[0031] The first voltage, the second voltage and the third voltage are different from each other.

[0032] In some embodiments, the voltage processing circuit further includes:

[0033] A current limiting device, a first end of which is connected to the output end of the first switch tube, and a second end of which is connected to the second power supply terminal via the second drive branch, wherein the current limiting device is used to limit the current flowing through the first switch tube when the first switch tube is turned on.

[0034] In some embodiments, the current limiting device includes:

[0035] A first resistor is connected in series between the output end of the first switch tube and the second driving branch. The first resistor is used to interact with the threshold voltage of the first switch tube and the first level when the pulse signal is at a first level to control the value of the current flowing through the first switch tube.

[0036] The present invention also proposes an air conditioner, which includes multiple groups of upper and lower bridge arms, motors and multiple drive circuits as mentioned above, wherein the motors are respectively electrically connected to the output ends of the multiple groups of upper and lower bridge arms, and the multiple drive circuits are respectively electrically connected to the controlled ends of the multiple groups of upper and lower bridge arms in a one-to-one correspondence.

[0037] The technical solution of the present invention sets a pulse conversion circuit, and according to the waveform of the connected pulse signal, controls the first drive branch and the second drive branch respectively when the pulse signal is at the first level or the second level, drives the upper bridge arm and the lower bridge arm to be alternately turned on, and outputs a power supply voltage with a corresponding waveform through the output terminal, thereby realizing simultaneous control of the upper and lower bridge arms through one pulse, simplifying the number of drive circuits, and since only one signal is needed to simultaneously control the two bridge arms, reducing the occupancy of the external interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 It is a structural schematic diagram of an embodiment of a driving circuit of the present invention;

[0040] Figure 2 A schematic structural diagram of another embodiment of a driving circuit of the present invention;

[0041] Figure 3 It is a structural schematic diagram of another embodiment of the driving circuit of the present invention;

[0042] Figure 4 A circuit connection diagram of an embodiment of a driving circuit of the present invention;

[0043] Figure 5 FIG. 4 is a circuit connection diagram of an embodiment of a voltage processing circuit in the present invention.

[0044] Description of Figure Numbers:

[0045] Label name Label name 100 Pulse conversion circuit 113 Current limiting devices 110 Level conversion circuit U1 First voltage source 111 Voltage Source Circuit Q1~Q2 The first switch tube ~ the second switch tube 112 Voltage Processing Circuit TZD1 Voltage regulator 120 Pulse distribution circuit D1 diode 200 The first driving branch C1 capacitance 300 The second driving branch R1~R2 First resistor~Second resistor

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] The present invention provides a driving circuit applied to an air conditioner. The air conditioner comprises an output terminal, and an upper bridge arm and a lower bridge arm respectively connected to the output terminal.

[0050] Reference Figure 1 In one embodiment, the driving circuit comprises:

[0051] A pulse conversion circuit 100, whose input end is used to access an external pulse signal, and the pulse conversion circuit 100 is also used to output a control signal of a first voltage when the pulse signal is at a first level, and to output a control signal of a second voltage when the pulse signal is at a second level; wherein the first level is different from the second level, and the first voltage is different from the second voltage;

[0052] A first driving branch 200, a control end of which is electrically connected to the upper bridge arm, and a controlled end of which is connected to the first output end of the pulse conversion circuit 100;

[0053] A second driving branch 300, a control end of which is electrically connected to the lower bridge arm, and a controlled end of which is connected to the second output end of the pulse conversion circuit 100;

[0054] The first driving branch 200 and the second driving branch 300 are used to alternately drive the upper bridge arm and the lower bridge arm to be turned on under the control of the control signal, so as to output a supply voltage with a corresponding waveform through the output terminal.

[0055] In this embodiment, the first driving branch 200 and the second driving branch 300 may be conventional driving chips, which have different control voltages but can output the same voltage level to drive the upper and lower bridge arms respectively.

[0056] When the motor is powered normally, the external controller will output a pulse signal to the pulse conversion circuit 100 according to the target voltage of the motor, and the pulse signal is composed of a first level and a second level alternating to form a corresponding square wave. After receiving the pulse signal, the pulse conversion circuit 100 triggers different voltage outputs according to the current different levels, and the first level is a high level and the second level is a low level as an example for explanation:

[0057] When the pulse signal is input into the pulse conversion circuit 100, if the pulse conversion circuit 100 is triggered by a high level, a control signal of a first voltage is output to the first driving branch 200, and the first driving branch 200 is controlled to output a corresponding level to drive the upper bridge arm, so that the upper bridge arm is turned on and the first external power supply is connected. Since the second driving branch 300 does not receive the control signal, it will not control the lower bridge arm to work, so the lower bridge arm is turned off, and the output interface only outputs the first external power supply; if the pulse conversion circuit 100 is triggered by a low level, a control signal of a second voltage is output to the second driving branch 300, and the second driving branch 300 is controlled to output a corresponding level to drive the lower bridge arm, so that the lower bridge arm is turned on and the second external power supply is connected. Since the first driving branch 200 does not receive the control signal, it will not control the upper bridge arm to work, so the upper bridge arm is turned off, and the output interface only outputs the second external power supply.

[0058] Thus, by alternately controlling the operation of the first drive branch 200 and the second branch, the upper and lower bridge arms are alternately turned on, and a single-phase power supply voltage of a corresponding waveform is output. Since there are multiple other groups of upper bridge arms and lower bridge arms in the air conditioner, the corresponding pulse signals are output to multiple drive circuits respectively, so that the multi-phase power supply voltage can be adjusted separately to realize flexible control of the motor power supply.

[0059] The technical solution of the present invention is to set up a pulse conversion circuit 100, and according to the waveform of the connected pulse signal, when the pulse signal is at the first level or the second level, respectively control the first driving branch 200 and the second driving branch 300, drive the upper bridge arm and the lower bridge arm to be alternately turned on, and output a power supply voltage with a corresponding waveform through the output terminal, so as to realize the simultaneous control of the upper and lower bridge arms through one pulse, simplify the number of driving circuits, and because only one signal is needed to realize the control of the two bridge arms at the same time, reduce the occupancy of the external interface.

[0060] Reference Figure 1 and Figure 2In one embodiment, the pulse conversion circuit 100 includes:

[0061] The level conversion circuit 110, whose output end is the first output end of the pulse conversion circuit 100, is used to output a control signal of a first voltage to the first driving branch 200 when receiving a first level;

[0062] a pulse distribution circuit 120, whose input end is the input end of the pulse conversion circuit 100, whose first output end is connected to the controlled end of the level conversion circuit 110, and whose second output end is the second output end of the pulse conversion circuit 100, for outputting the received first level to the level conversion circuit 110, and outputting the received second level to the second driving branch 300;

[0063] The voltage value of the second level is the same as the voltage value of the second voltage.

[0064] It is understandable that when controlling the first drive circuit, since the pin voltage of the external controller is usually a lower voltage such as 5V or 3.3V, if the effective level of the drive branch is a high level, the first drive circuit may not be controlled only by the voltage value of the first level.

[0065] Therefore, in this embodiment, a level conversion circuit 110 is provided. When the pulse distribution circuit 120 is triggered by the first level and outputs the first level to the level conversion circuit 110, the level conversion circuit 110 converts the first level and outputs a first voltage with a higher voltage value to control the first driving branch 200.

[0066] When the pulse distribution circuit 120 is triggered by the second level, since the second level is a low level in this embodiment, there is no need to perform level conversion processing. The second voltage representing the low level can be directly output to the second driving branch 300 to lower the level of its controlled end and control its operation.

[0067] Reference Figure 1 and Figure 3 In one embodiment, the level conversion circuit 110 includes:

[0068] A voltage source circuit 111, whose ground terminal is used to connect to the output terminal, and the voltage source circuit 111 is also used to output a third voltage;

[0069] A voltage processing circuit 112, whose controlled end is the controlled end of the level conversion circuit 110, whose output end is the output end of the level conversion circuit 110, and whose input end is connected to the output end of the voltage source circuit 111;

[0070] The voltage processing circuit 112 is further used to receive the third voltage under the control of the first level, convert it, and output a control signal corresponding to the first voltage;

[0071] The third voltage is different from the first voltage and the second voltage.

[0072] In this embodiment, the ground end of the voltage source circuit 111 is connected to the output terminal. When the upper bridge arm is turned on, the voltage of the output terminal is equal to the voltage of the external power supply connected to the upper bridge arm. At this time, when the ground potential is raised, the voltage source circuit 111 can provide a higher third voltage to the voltage processing circuit 112. At this time, the voltage processing circuit 112 is triggered to turn on by the first level, so the third voltage can be connected to perform voltage processing on it, and a control signal of the first voltage that can control the first drive branch 200 is output.

[0073] When the lower bridge arm is turned on, the voltage processing circuit 112 does not receive the first level and is turned off, so it is unable to process the voltage output by the voltage source circuit 111 at this time and will not control the first driving branch 200 to work.

[0074] Reference Figures 1 to 4 In one embodiment, the air conditioner further comprises a first power terminal connected to the upper bridge arm, and a second power terminal connected to the lower bridge arm, and the voltage source circuit 111 comprises:

[0075] A first voltage source U1, connected to the ground terminal and the second power terminal;

[0076] A capacitor C1, a first end of which is connected to the input end of the voltage processing circuit 112, and a second end of which is used to connect to the output terminal;

[0077] The diode D1 has a cathode connected to the first end of the capacitor C1 and an anode connected to the output end of the first voltage source U1.

[0078] In this embodiment, the first voltage source U1 may be a battery, or a DC voltage connected to a power management circuit inside the air conditioner.

[0079] Specifically, the first power terminal is connected to the positive phase output terminal of the external power supply, and the second power terminal is connected to the negative phase output terminal of the external power supply as an example for description:

[0080] When the lower bridge arm is turned on and the upper bridge arm is turned off, the first voltage source U1 charges the capacitor C1 via the diode D1, that is, when the lower bridge arm is turned on, the output terminal is connected to the second power supply terminal. At this time, the second end of the capacitor C1 is at a low potential, and the first end thereof is at a high potential due to the existence of the first voltage source U1, forming a potential difference, and the first voltage source U1 begins to charge the capacitor C1 via the diode D1.

[0081] When the upper bridge arm is turned on and the lower bridge arm is turned off, under the action of the voltage of the external power supply connected to the second power supply terminal, the capacitor C1 discharges to the input end of the voltage processing circuit 112 with the third voltage, that is, when the upper bridge arm is turned on, the output terminal is connected to the first power supply terminal. At this time, the second end of the capacitor C1 is at a high potential, and the voltage is equal to the voltage value of the external power supply. Since the voltages at both ends of the capacitor C1 are equal after being fully charged, and the voltages at both ends of the capacitor C1 will not change suddenly, the capacitor C1 uses the voltage value of the external power supply as the voltage value of the third voltage and discharges to the level processing circuit, so that it processes the third voltage and outputs a control signal of the first voltage.

[0082] Wherein, the voltage value of the external power supply is the same as the voltage value of the third voltage.

[0083] Refer to the figure to Figure 4 , in one embodiment, the air conditioner further comprises a second power supply terminal connected to the lower bridge arm, and the voltage processing circuit 112 comprises;

[0084] A first switch tube Q1, whose controlled end is the controlled end of the voltage processing circuit 112, and whose output end is connected to the second power supply terminal via the second driving branch 300;

[0085] A second switch tube Q2, whose controlled end is connected to the input end of the first switch tube Q1, whose input end is the input end of the voltage processing circuit 112, and whose output end is connected to the controlled end of the first driving branch 200;

[0086] The voltage regulator tube TZD1 has an anode connected to the controlled end of the second switch tube Q2, and a cathode connected to the input end of the second switch tube Q2.

[0087] In this embodiment, the first switch tube Q1 and the second switch tube Q2 may be MOS tubes, triodes or IGBTs.

[0088] Specifically, taking the first switch tube Q1 and the second switch tube Q2 as NMOS tubes as an example, the following description is given:

[0089] When the pulse signal is at the first level, the first switch tube Q1 is turned on, and the second switch tube Q2 is controlled to be turned on. The voltage regulator tube TZD1 clamps the voltage at the controlled end of the second switch tube Q2, controls the second switch tube Q2 to divide the third voltage, and outputs a control signal of the first voltage. That is, when the pulse signal is at the first level, the first switch tube Q1 is triggered to turn on. At this time, the capacitor C1, the voltage regulator tube TZD1, the first switch tube Q1 to the second power supply terminal can form a current loop. Since the first end of the capacitor C1 is the third voltage, after being clamped by the voltage regulator tube TZD1, the drain-source voltage of the first switch tube Q1 is also a constant value, that is, the second voltage. Therefore, during the period when the pulse signal is at the first level, the second switch tube Q2 can be controlled to be turned on with a stable voltage, and the first end of the capacitor C1 is directly connected to the controlled end of the first drive branch 200, so that the first drive branch 200 is driven to work with a higher voltage.

[0090] When the pulse signal is at the second level, the first switch tube Q1 is turned off, and the second switch tube Q2 is controlled to be turned off, and the second switch tube Q2 stops being connected to the third voltage. That is, when the pulse signal is at the first level, the first switch tube Q1 is turned off, and the second switch tube Q2 cannot be controlled to be turned on. At this time, the first driving branch 200 stops working.

[0091] The first voltage, the second voltage and the third voltage are different from each other.

[0092] Furthermore, the level processing circuit also includes a second resistor R2 connected in parallel to both ends of the voltage regulator tube TZD1 for shunting the current connected to the voltage regulator tube TZD1 to prevent a large current from impacting the voltage regulator tube TZD1 and causing damage to the voltage regulator tube TZD1.

[0093] Refer to the figure to Figure 5 In one embodiment, the voltage processing circuit 112 further includes:

[0094] A current limiting device 113 has a first end connected to the output end of the first switch tube Q1, and a second end connected to the second power supply terminal via the second drive branch 300. The current limiting device 113 is used to limit the current flowing through the first switch tube Q1 when the first switch tube Q1 is turned on.

[0095] In this embodiment, the current limiting device 113 is provided to limit the current flowing through the first switch tube Q1 , and the power consumption of the first switch tube Q1 is reduced by reducing the current flowing through the first switch tube Q1 when the first switch tube Q1 is turned on.

[0096] Specifically, the current limiting device 113 includes:

[0097] The first resistor R1 is connected in series between the output end of the first switch tube Q1 and the second driving branch 300. The first resistor R1 is used to interact with the threshold voltage of the first switch tube Q1 and the first level when the pulse signal is at the first level, so as to control the value of the current flowing through the first switch tube Q1.

[0098] In this embodiment, according to Kirchhoff's voltage law, in the current loop where the first resistor R1 and the first switch tube Q1 are located, the drain current ID of the first switch tube Q1 is determined by the following equation:

[0099] VGS=Vop-R1*ID, wherein VGS is the threshold voltage of the first switch tube Q1, and Vop is the voltage value corresponding to the first level. Since VGS and Vop are constant values, the drain current ID is completely determined by the first resistor R1. Therefore, by reasonably setting the resistance value of the first resistor R1, the drain current of the first switch tube Q1 can be limited.

[0100] The present invention also proposes an air conditioner, which includes multiple groups of upper and lower bridge arms, motors and multiple drive circuits mentioned above, the motors are respectively electrically connected to the output ends of the multiple groups of upper and lower bridge arms, and the multiple drive circuits are respectively electrically connected to the controlled ends of the multiple groups of upper and lower bridge arms in a one-to-one correspondence. The specific structure of the drive circuit refers to the above-mentioned embodiment. Since the air conditioner adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0101] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A driving circuit applied to an air conditioner, the air conditioner comprising an output terminal, and an upper bridge arm and a lower bridge arm respectively connected to the output terminal, It is characterized in that The driving circuit comprises: A pulse conversion circuit, wherein the input end is used to receive an external pulse signal, and the pulse conversion circuit is further used to output a control signal of a first voltage when the received pulse signal is at a first level, and to output a control signal of a second voltage when the pulse signal is at a second level; wherein the first level is different from the second level, and the first voltage is different from the second voltage; A first driving branch, a control end of which is electrically connected to the upper bridge arm, and a controlled end of which is connected to the first output end of the pulse conversion circuit; A second driving branch, a control end of which is electrically connected to the lower bridge arm, and a controlled end of which is connected to the second output end of the pulse conversion circuit; The first driving branch and the second driving branch are used to alternately drive the upper bridge arm and the lower bridge arm to conduct under the control of the control signal, so as to output a supply voltage with a corresponding waveform through the output terminal.

2. The driving circuit according to claim 1, It is characterized in that The pulse conversion circuit comprises: a level conversion circuit, whose output end is the first output end of the pulse conversion circuit, and is used to output a control signal of a first voltage to the first driving branch when receiving a first level; a pulse distribution circuit, whose input end is the input end of the pulse conversion circuit, whose first output end is connected to the controlled end of the level conversion circuit, and whose second output end is the second output end of the pulse conversion circuit, and is used to output the received first level to the level conversion circuit, and output the received second level to the second driving branch; The voltage value of the second level is the same as the voltage value of the second voltage.

3. The driving circuit according to claim 2, It is characterized in that The level conversion circuit comprises: A voltage source circuit, whose ground terminal is used to connect to the output terminal, and the voltage source circuit is also used to output a third voltage; a voltage processing circuit, wherein a controlled end of the voltage processing circuit is the controlled end of the level conversion circuit, an output end of the voltage processing circuit is the output end of the level conversion circuit, and an input end of the voltage processing circuit is connected to the output end of the voltage source circuit; The voltage processing circuit is further used to receive the third voltage under the control of the first level, convert it, and output a control signal corresponding to the first voltage; The third voltage is different from the first voltage and the second voltage.

4. The driving circuit according to claim 3, wherein the air conditioner further comprises a first power terminal connected to the upper bridge arm, and a second power terminal connected to the lower bridge arm, It is characterized in that The voltage source circuit comprises: A first voltage source, whose ground terminal is connected to the second power terminal, and whose output terminal is used to output the first power; A capacitor, a first end of which is connected to the input end of the voltage processing circuit, and a second end of which is used to connect to the output terminal; A diode has a cathode connected to the first end of the capacitor and an anode connected to the output end of the first voltage source.

5. The driving circuit according to claim 4, It is characterized in that When the lower bridge arm is turned on and the upper bridge arm is turned off, the first voltage source outputs the first power supply, and the first power supply charges the capacitor through the diode; When the upper bridge arm is turned on and the lower bridge arm is turned off, under the action of the voltage of the external power supply connected to the second power terminal, the capacitor discharges to the input end of the voltage processing circuit with the third voltage; Wherein, the voltage value of the external power supply is the same as the voltage value of the third voltage.

6. The driving circuit according to claim 3, wherein the air conditioner further comprises a second power supply terminal connected to the lower bridge arm, It is characterized in that The voltage processing circuit comprises: a first switch tube, whose controlled end is the controlled end of the voltage processing circuit, and whose output end is connected to the second power supply terminal via the second driving branch; a second switch tube, whose controlled end is connected to the input end of the first switch tube, whose input end is the input end of the voltage processing circuit, and whose output end is connected to the controlled end of the first driving branch; A voltage regulator tube, an anode of which is connected to the controlled end of the second switch tube, and a cathode of which is connected to the input end of the second switch tube.

7. The driving circuit according to claim 6, It is characterized in that When the pulse signal is at the first level, the first switch tube is turned on, and controls the second switch tubes to be turned on, the voltage regulator tube clamps the voltage of the controlled end of the second switch tube, controls the second switch tube to divide the third voltage, and outputs a control signal of the first voltage; When the pulse signal is at the second level, the first switch tube is turned off, and the second switch tubes are controlled to be turned off, so that the second switch tubes stop receiving the third voltage; The first voltage, the second voltage and the third voltage are different from each other.

8. The driving circuit according to claim 6, It is characterized in that The voltage processing circuit further includes: A current limiting device, a first end of which is connected to the output end of the first switch tube, and a second end of which is connected to the second power supply terminal via the second drive branch, wherein the current limiting device is used to limit the current flowing through the first switch tube when the first switch tube is turned on.

9. The driving circuit according to claim 8, It is characterized in that The current limiting device comprises: A first resistor is connected in series between the output end of the first switch tube and the second driving branch. The first resistor is used to interact with the threshold voltage of the first switch tube and the first level when the pulse signal is at a first level to control the value of the current flowing through the first switch tube.

10. An air conditioner, It is characterized in that The air conditioner includes multiple groups of upper and lower bridge arms, motors and multiple driving circuits as described in any one of claims 1 to 9, the motors are electrically connected to the output ends of the multiple groups of upper and lower bridge arms, and the multiple driving circuits are electrically connected to the controlled ends of the multiple groups of upper and lower bridge arms one by one.

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