Charging circuit, air conditioner and control method

Abstract

The invention provides a charging circuit, an air conditioner and a control method. The charging circuit comprises a first charging loop, a second charging loop and a switching circuit. The input end of the first charging loop is connected with a power supply of the air conditioner, the output end of the first charging loop is connected with a driving circuit of the air conditioner, and the first charging loop is further connected with a control circuit of the air conditioner; the output end of the second charging loop is connected with the driving circuit, and the second charging loop is also connected with the control circuit; the switching circuit is connected with the input end of the second charging loop, the power supply and the control circuit. According to the invention, when the first charging loop fails, the bus capacitor of the driving circuit can be charged through the second charging loop, so that the stability of the charging loop is improved.

Description

Technical Field

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

[0002] Refrigeration technology mainly absorbs and releases heat through the change of the state of the refrigerant to achieve the cooling effect, the purpose is to maintain the temperature of the space at a low temperature. One of the carriers of refrigeration technology is the air conditioner, which can also achieve cooling through the air conditioner.

[0003] An air conditioner generally includes a charging circuit, a driving circuit and a control circuit. The charging circuit is mainly used to charge the driving circuit so that the driving circuit can drive the air conditioner to operate. The charging circuit mainly includes a charging relay, and the charging of the driving circuit is achieved by controlling the conduction of the charging relay. However, when the charging relay fails, the charging circuit will directly fail and the driving circuit cannot be charged. That is, the stability of the current charging circuit is poor. Summary of the invention

[0004] The present invention provides a charging circuit, an air conditioner and a control method, aiming to solve the problem of poor stability of the current charging circuit of the air conditioner.

[0005] In a first aspect, the present invention provides a charging circuit, which is applied to an air conditioner, and the charging circuit includes a first charging circuit, a second charging circuit and a switching circuit; the input end of the first charging circuit is connected to a power supply of the air conditioner, the output end of the first charging circuit is connected to a drive circuit of the air conditioner, and the first charging circuit is also connected to a control circuit of the air conditioner; the output end of the second charging circuit is connected to the drive circuit, and the second charging circuit is also connected to the control circuit; the switching circuit is respectively connected to the input end of the second charging circuit, the power supply and the control circuit.

[0006] Further, the switch circuit includes a first switch and a second switch; one end of the first switch and one end of the second switch are both connected to the power supply, the other end of the first switch and the other end of the second switch are both connected to the second charging circuit, and the controlled end of the first switch and the controlled end of the second switch are also connected to the control circuit; one end of the second switch is connected to the power supply, the other end of the second switch is connected to the first charging circuit, and the controlled end of the second switch is also connected to the control circuit.

[0007] Furthermore, the first charging circuit includes a first relay, one end of the first relay is connected to the power supply, and the other end of the first relay is connected to the drive circuit.

[0008] Furthermore, the first charging circuit further includes a first resistor, one end of the first resistor is connected to the power supply, and the other end of the first resistor is respectively connected to the second switch and the first relay.

[0009] Furthermore, the first charging circuit further includes a first relay control circuit, one end of the first relay control circuit is connected to the first relay, and the other end of the first relay control circuit is connected to the control circuit.

[0010] Furthermore, the second charging circuit includes a second relay, one end of the second relay is connected to the first switch and the second switch respectively, and the other end of the second relay is connected to the driving circuit.

[0011] Furthermore, the second charging circuit also includes a second relay control circuit, one end of the second relay control circuit is connected to the second relay, and the other end of the second relay control circuit is connected to the control circuit.

[0012] In a second aspect, the present invention provides an air conditioner, comprising a power supply, a control circuit, a drive circuit and any one of the charging circuits described above.

[0013] In a third aspect, the present invention provides a control method, the method comprising:

[0014] Controlled by a start-up instruction for starting the air conditioner, voltage detection is performed on a drive circuit of the air conditioner to obtain a bus voltage;

[0015] If the bus voltage is less than a preset threshold, the switch circuit of the charging circuit of the air conditioner is controlled to be turned on so that the power supply supplies power to the driving circuit through the second power supply circuit.

[0016] The present invention discloses an air conditioner and a control method for controlling the air conditioner. The air conditioner comprises a power supply, a control circuit and a charging circuit. The charging circuit comprises a first charging circuit, a second charging circuit and a switch circuit. The first charging circuit and the second charging circuit are respectively connected to the power supply, the control circuit and the drive circuit. The switch circuit is respectively connected to the second charging circuit, the power supply and the control circuit. The first charging circuit may comprise a charging relay. When the charging relay is normal, the drive circuit is charged by the first charging circuit. When the charging relay is abnormal, the control circuit controls the switch circuit and the second charging circuit to be turned on. The power supply supplies power to the drive circuit through the switch circuit and the second charging circuit, thereby improving the stability of the charging circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0018] Figure 1 is a block diagram of a charging circuit provided by an embodiment of the present invention;

[0019] Figure 2 is a block diagram of a charging circuit provided by another embodiment of the present invention;

[0020] Figure 3 is a circuit diagram of a charging circuit provided by an embodiment of the present invention;

[0021] Figure 4 is a flow chart of a control method provided by an embodiment of the present invention;

[0022] Figure 5 It is a sub-flow chart of a control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] 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 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.

[0024] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, operations, elements, components and / or groups thereof.

[0025] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms of "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0026] In addition, the directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only for reference to the directions of the attached drawings and the use status of the product. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0027] See also Figures 1 to 3 , Figure 1 is a block diagram of a charging circuit 100 provided in one embodiment of the present invention; Figure 2 is a block diagram of a charging circuit 100 provided in another embodiment of the present invention; Figure 3 FIG. 1 is a circuit diagram of a charging circuit 100 provided in one embodiment of the present invention. Figure 1 As shown, the charging circuit 100 includes a first charging circuit 10, a second charging circuit 20 and a switch circuit 30; the input end of the first charging circuit 10 is connected to the power supply 200 of the air conditioner, the output end of the first charging circuit 10 is connected to the drive circuit 300 of the air conditioner, and the first charging circuit 10 is also connected to the control circuit 400 of the air conditioner; the output end of the second charging circuit 20 is connected to the drive circuit 300, and the second charging circuit 20 is also connected to the control circuit 400; the switch circuit 30 is respectively connected to the input end of the second charging circuit 20, the power supply 200 and the control circuit 400.

[0028] Specifically, the air conditioner may include a control circuit 400, a power supply 200, a drive circuit 300, and a charging circuit. The power supply 200 may be an AC power supply or a front-stage power supply circuit, which is mainly used to power the air conditioner. The control circuit 400 may include a control chip, which is mainly used to control the operation of the air conditioner and to control the on and off of the charging circuit so as to control the power supply 200 to charge the drive circuit 300. The drive circuit 300 is used to drive the air conditioner to operate, and it may be a commonly used drive circuit 300 in the art, and its specific structure is not limited here.

[0029] The charging circuit may include a first charging circuit 10, a second charging circuit 20, and a switch circuit 30. The input end of the first charging circuit 10 is connected to the power supply 200, and the output end of the first charging circuit 10 is connected to the drive circuit 300. When the air conditioner operates normally, the control circuit 400 controls the first charging circuit 10 to be turned on, and the power supply 200 supplies power to the drive circuit 300 through the first charging circuit 10.

[0030] The output end of the second charging circuit 20 is connected to the driving circuit 300. The second charging circuit 20 serves as an auxiliary charging circuit. On the one hand, after the driving circuit 300 is charged through the first charging circuit 10, the second charging circuit 20 is turned on, and the power supply 200 directly supplies power to the driving circuit 300 through the second charging circuit 20 to avoid power loss. The input end of the second charging circuit 20 is connected to the switch circuit 30, and the switch circuit 30 is connected to the power supply 200. When the control circuit 400 detects that the first charging circuit 10 fails, the control circuit 400 controls the second charging circuit 20 to be turned on. At the same time, the control circuit 400 also controls the switch circuit 30 to be turned on, and the power supply 200 supplies power to the driving circuit 300 through the switch circuit 30 and the second charging circuit 20.

[0031] The control circuit 400 can also be connected to the drive circuit 300 to detect the bus voltage and determine whether the first charging circuit 10 is invalid by the magnitude of the bus voltage. For example, when the air conditioner is operating normally, if the control circuit 400 detects that the bus voltage after the first charging circuit 10 is turned on for a period of time is less than a preset threshold, the first charging circuit 10 can be determined to be invalid. If the control circuit 400 detects that the bus voltage after the first charging circuit 10 is turned on for a period of time is greater than or equal to the preset threshold, the first charging circuit 10 can be determined to be normal. In addition, the control circuit 400 can also be connected to the output end of the power supply 200 to detect the zero-crossing signal ( Figure 3 V0 is a zero-crossing signal detection point), when the control circuit 400 detects a zero-crossing signal, the first charging circuit 10 is controlled to be turned on.

[0032] In actual use, when the air conditioner operates normally and the control circuit 400 detects a zero-crossing signal, the control circuit 400 controls the first charging circuit 10 to be turned on. After the first charging circuit 10 is turned on for a certain period of time, the control circuit 400 detects the bus voltage of the drive circuit 300. If the bus voltage is greater than or equal to the preset threshold, it means that the first charging circuit 10 is operating normally and the bus capacitor in the drive circuit 300 can store energy normally. After the bus capacitor is charged for a period of time, that is, after the voltage of the bus capacitor reaches the target voltage, the second charging circuit 20 is turned on and the first charging circuit 10 is disconnected. The power supply 200 supplies power to the drive circuit 300 through the second charging circuit 20.

[0033] If the bus voltage is less than the preset threshold, it means that the first charging circuit 10 fails, and the control circuit 400 controls the switch circuit 30 and the second charging circuit 20 to be turned on, and the power supply 200 charges the bus capacitor of the drive circuit 300 through the switch circuit 30 and the second charging circuit 20. The control circuit 400 continues to collect the bus voltage and determines whether the bus voltage is greater than the target voltage. If the bus voltage is less than the target voltage, the control circuit 400 can adjust the duty cycle to quickly turn on and off the second charging circuit 20 until the bus voltage is greater than or equal to the target voltage.

[0034] See also Figure 3 As a further embodiment, the switch circuit 30 includes a first switch K3 and a second switch K4; one end of the first switch K3 and one end of the second switch K4 are both connected to the power supply 200, the other end of the first switch K3 and the other end of the second switch K4 are both connected to the second charging circuit 20, and the controlled end of the first switch K3 and the controlled end of the second switch K4 are also connected to the control circuit 400.

[0035] Among them, one end of the first switch K3 and one end of the second switch K4 are both connected to the power supply 200, the other end of the first switch K3 and the other end of the second switch K4 are both connected to the second charging circuit 20, and the controlled end of the first switch K3 and the controlled end of the second switch K4 are both connected to the control circuit 400. Preferably, the first switch K3 is a normally closed switch, the second switch K4 is a normally open switch, the first switch K3 and the second switch K4 are connected in parallel, when the first charging circuit 10 is normal, the first switch K3 is closed, the second switch K4 is opened, and the power supply 200 charges the drive circuit 300 through the first charging circuit 10. When the first charging circuit 10 fails, the control circuit 400 controls the first switch K3 to be opened and the second switch K4 to be closed, the power supply 200, the second switch K4, and the second charging circuit 20 form a loop, and the power supply 200 charges the drive circuit 300 through the second charging circuit 20.

[0036] As a further embodiment, the first charging circuit 10 includes a first relay 11, one end of the first relay 11 is connected to the power supply 200, and the other end of the first relay 11 is connected to the drive circuit 300. As a further embodiment, the first charging circuit 10 also includes a first resistor, one end of the first resistor is connected to the power supply 200, and the other end of the first resistor is connected to the second switch K4 and the first relay 11 respectively.

[0037] The first charging circuit 10 may include a first relay 11, which is a charging relay. One end of the first relay 11 is connected to the power supply 200 via a first resistor, and the other end of the first relay 11 is connected to the drive circuit 300. Figure 3 As shown, Figure 3 K3 is the first relay 11. When the first charging circuit 10 is normal, the power supply 200 ( Figure 3 The AC is a power supply 200, which charges the drive circuit 300 through a first resistor and a first relay 11. The first resistor is a cement resistor, which is used to prevent the closing surge generated when power is just turned on from damaging the subsequent components.

[0038] As a further embodiment, the first charging circuit 10 further includes a first relay control circuit 400 , one end of the first relay control circuit 400 is connected to the first relay 11 , and the other end of the first relay control circuit 400 is connected to the control circuit 400 .

[0039] Among them, Figure 3 As shown, the first relay control circuit 400 may include a first photocoupler U1, a second resistor R2, a third resistor R3, a first capacitor C1 and a first switch K3 tube Q1. One end of the first photocoupler U1 is connected to the control circuit 400, and the other end of the first photocoupler U1 is connected to the controlled end of the first switch K3 tube Q1. The first switch K3 tube Q1 is also connected to the first relay 11 for controlling the on and off of the first relay 11.

[0040] As a further embodiment, the second charging circuit 20 includes a second relay 21 , one end of the second relay 21 is connected to the first switch K3 and the second switch K4 respectively, and the other end of the second relay 21 is connected to the driving circuit 300 .

[0041] The second charging circuit 20 may include a second relay 21, one end of the second relay 21 is connected to the first switch K3 and the second switch K4 respectively, and the other end of the second relay 21 is connected to the drive circuit 300. The second relay 21 is used as a power relay, on the one hand, to charge the drive circuit 300 when the first relay 11 fails, and on the other hand, to supply power to the drive circuit 300 when the voltage of the bus capacitor reaches the target voltage. Figure 3 As shown, Figure 3K2 is the second relay 21. When in use, if the first relay 11 is normal, the power supply 200 charges the drive circuit 300 through the first relay 11. If the first relay 11 fails, the control circuit 400 controls the first switch K3 to be disconnected, the second switch K4 to be closed, the second relay 21 to be turned on, and the power supply 200 charges the bus capacitor of the drive circuit 300 through the second switch K4 and the second relay 21. When the voltage of the bus capacitor reaches the target voltage, the first switch K3 is closed, the second switch K4 is disconnected, and the power supply 200 supplies power to the drive circuit 300 through the first switch K3 and the second relay 21.

[0042] As a further embodiment, the second charging circuit 20 further includes a second relay control circuit 400 , one end of the second relay control circuit 400 is connected to the second relay 21 , and the other end of the second relay control circuit 400 is connected to the control circuit 400 .

[0043] Among them, Figure 3 As shown, the second relay control circuit 400 may include a second photocoupler U2, a fourth resistor R4, a fifth resistor R5, a second capacitor C2 and a second switch K4 tube Q2, one end of the second photocoupler U2 is connected to the control circuit 400, the other end of the second photocoupler U2 is connected to the second switch K4 tube Q2, and the second switch K4 tube Q2 is connected to the second relay 21 for controlling the conduction and disconnection of the second relay 21.

[0044] The operating principle of the charging circuit 100 is comprehensively described below. When the air conditioner operates normally, the control circuit 400 performs zero-crossing detection, and when a zero-crossing signal is detected, the timer of the control circuit 400 starts timing, and the first relay 11 is closed at the 2nd second, and the power supply 200 charges the bus capacitor of the drive circuit 300 through the first resistor and the first relay 11. At the 4th second, it is determined whether the bus voltage of the drive circuit 300 is greater than or equal to the preset threshold. If the bus voltage is greater than or equal to the preset threshold, the second relay 21 is closed at the 20th second, and the first relay 11 is disconnected at 20.5 seconds, and the power supply 200 continues to supply power to the drive circuit 300 through the second relay 21. If the bus voltage is less than the preset threshold, the first switch K3 is disconnected at the 5th second and the second switch K4 is closed at the 5.5th second. The power supply 200 charges the bus capacitor of the drive circuit 300 through the second switch K4 and the second relay 21. When the bus voltage is less than the target voltage, the duty cycle is adjusted by the control circuit 400 to quickly switch on and off the second relay 21 until the bus voltage is greater than or equal to the target voltage, and the second switch K4 is disconnected after the first second after the condition is met, and the first switch K3 is closed after 1.5 seconds.

[0045] The present invention also provides an air conditioner, which includes a power supply 200, a control circuit 400, a drive circuit 300 and a charging circuit 100 described in any one of the above embodiments; the charging circuit 100 includes a first charging circuit 10, a second charging circuit 20 and a switch circuit 30; the input end of the first charging circuit 10 is connected to the power supply 200 of the air conditioner, the output end of the first charging circuit 10 is connected to the drive circuit 300 of the air conditioner, and the first charging circuit 10 is also connected to the control circuit 400 of the air conditioner; the output end of the second charging circuit 20 is connected to the drive circuit 300, and the second charging circuit 20 is also connected to the control circuit 400; the switch circuit 30 is respectively connected to the input end of the second charging circuit 20, the power supply 200 and the control circuit 400.

[0046] Specifically, the air conditioner may include a control circuit 400, a power supply 200, a drive circuit 300, and a charging circuit. The power supply 200 may be an AC power supply or a front-stage power supply circuit, which is mainly used to power the air conditioner. The control circuit 400 may include a control chip, which is mainly used to control the operation of the air conditioner and to control the on and off of the charging circuit so as to control the power supply 200 to charge the drive circuit 300. The drive circuit 300 is used to drive the air conditioner to operate, and it may be a commonly used drive circuit 300 in the art, and its specific structure is not limited here.

[0047] The charging circuit may include a first charging circuit 10, a second charging circuit 20, and a switch circuit 30. The input end of the first charging circuit 10 is connected to the power supply 200, and the output end of the first charging circuit 10 is connected to the drive circuit 300. When the air conditioner operates normally, the control circuit 400 controls the first charging circuit 10 to be turned on, and the power supply 200 supplies power to the drive circuit 300 through the first charging circuit 10.

[0048] The output end of the second charging circuit 20 is connected to the driving circuit 300. The second charging circuit 20 serves as an auxiliary charging circuit. On the one hand, after the driving circuit 300 is charged through the first charging circuit 10, the second charging circuit 20 is turned on, and the power supply 200 directly supplies power to the driving circuit 300 through the second charging circuit 20 to avoid power loss. The input end of the second charging circuit 20 is connected to the switch circuit 30, and the switch circuit 30 is connected to the power supply 200. When the control circuit 400 detects that the first charging circuit 10 fails, the control circuit 400 controls the second charging circuit 20 to be turned on. At the same time, the control circuit 400 also controls the switch circuit 30 to be turned on, and the power supply 200 supplies power to the driving circuit 300 through the switch circuit 30 and the second charging circuit 20.

[0049] The control circuit 400 can also be connected to the drive circuit 300 to detect the bus voltage and determine whether the first charging circuit 10 is invalid by the magnitude of the bus voltage. For example, when the air conditioner is operating normally, the control circuit 400 detects that the bus voltage after the first charging circuit 10 is turned on for a period of time is less than a preset threshold value, and the first charging circuit 10 can be determined to be invalid. If the control circuit 400 detects that the bus voltage after the first charging circuit 10 is turned on for a period of time is greater than or equal to the preset threshold value, the first charging circuit 10 can be determined to be normal. In addition, the control circuit 400 can also be connected to the output end of the power supply 200 to detect a zero-crossing signal. When the control circuit 400 detects a zero-crossing signal, the first charging circuit 10 is controlled to be turned on.

[0050] In actual use, when the air conditioner operates normally and the control circuit 400 detects a zero-crossing signal, the control circuit 400 controls the first charging circuit 10 to be turned on. After the first charging circuit 10 is turned on for a certain period of time, the control circuit 400 detects the bus voltage of the drive circuit 300. If the bus voltage is greater than or equal to the preset threshold, it means that the first charging circuit 10 is operating normally and the bus capacitor in the drive circuit 300 can store energy normally. After the bus capacitor is charged for a period of time, that is, after the voltage of the bus capacitor reaches the target voltage, the second charging circuit 20 is turned on and the first charging circuit 10 is disconnected. The power supply 200 supplies power to the drive circuit 300 through the second charging circuit 20.

[0051] If the bus voltage is less than the preset threshold, it means that the first charging circuit 10 fails, and the control circuit 400 controls the switch circuit 30 and the second charging circuit 20 to be turned on, and the power supply 200 charges the bus capacitor of the drive circuit 300 through the switch circuit 30 and the second charging circuit 20. The control circuit 400 continues to collect the bus voltage and determines whether the bus voltage is greater than the target voltage. If the bus voltage is less than the target voltage, the control circuit 400 can adjust the duty cycle to quickly turn on and off the second charging circuit 20 until the bus voltage is greater than or equal to the target voltage.

[0052] See also Figure 4 The present invention further provides a control method, which is applied to an air conditioner and is used to control the on and off of a charging circuit of the air conditioner. The control method includes S110-S120.

[0053] S110, controlled by a start instruction for starting the air conditioner, performing voltage detection on a driving circuit of the air conditioner to obtain a bus voltage.

[0054] In an embodiment of the present invention, the air conditioner may include a control circuit, a power supply, a drive circuit, and a charging circuit. The power supply may be an AC power supply or a front-stage power supply circuit, which is mainly used to power the air conditioner. The control circuit may include a control chip, which is mainly used to control the operation of the air conditioner and to control the on and off of the charging circuit so as to control the power supply to charge the drive circuit.

[0055] After the air conditioner is running, the control circuit detects the bus voltage of the drive circuit in real time, and determines whether the first charging circuit fails according to the magnitude relationship between the bus voltage and a preset threshold.

[0056] S120: If the bus voltage is less than a preset threshold, the switch circuit of the charging circuit of the air conditioner is controlled to be turned on so that the power supply supplies power to the driving circuit through the second power supply circuit.

[0057] In the embodiment of the present invention, if the bus voltage is less than the preset threshold, it means that the first charging circuit fails, and the control circuit controls the switch circuit and the second charging circuit to be turned on, and the power supply charges the bus capacitor of the drive circuit through the switch circuit and the second charging circuit. The control circuit continues to collect the bus voltage and determines whether the bus voltage is greater than the target voltage. If the bus voltage is less than the target voltage, the control circuit can adjust the duty cycle to quickly turn on and off the second charging circuit until the bus voltage is greater than or equal to the target voltage.

[0058] See also Figure 5 In some embodiments, such as in an embodiment of the present invention, the control method further includes step S130.

[0059] S130: If the bus voltage is greater than or equal to the preset threshold, control the switch circuit to be disconnected so that the power supply supplies power to the drive circuit through the first power supply loop.

[0060] In an embodiment of the present invention, if the bus voltage is greater than or equal to a preset threshold value, it means that the first charging circuit is operating normally, and the bus capacitor in the drive circuit can store energy normally. After the bus capacitor is charged for a period of time, that is, after the voltage of the bus capacitor reaches the target voltage, the second charging circuit is turned on and the first charging circuit is disconnected, and the power supply supplies power to the drive circuit through the second charging circuit.

[0061] The charging circuit, air conditioner and control method disclosed in the present invention can charge the bus capacitor of the driving circuit through the second charging circuit when the first charging circuit fails, thereby improving the stability of the charging circuit.

[0062] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A charging circuit, characterized in that: Applied to air conditioners, including: a first charging circuit, wherein an input end of the first charging circuit is connected to a power supply of the air conditioner, an output end of the first charging circuit is connected to a driving circuit of the air conditioner, and the first charging circuit is also connected to a control circuit of the air conditioner; a second charging circuit, wherein an output end of the second charging circuit is connected to the driving circuit, and the second charging circuit is also connected to the control circuit; A switch circuit is connected to the input end of the second charging circuit, the power supply and the control circuit respectively.

2. The charging circuit according to claim 1, characterized in that: The switch circuit includes a first switch and a second switch; One end of the first switch and one end of the second switch are both connected to the power supply, the other end of the first switch and the other end of the second switch are both connected to the second charging circuit, and the controlled end of the first switch and the controlled end of the second switch are also connected to the control circuit.

3. The charging circuit according to claim 2, characterized in that: The first charging circuit includes a first relay, one end of the first relay is connected to the power supply, and the other end of the first relay is connected to the drive circuit.

4. The charging circuit according to claim 3, characterized in that: The first charging circuit further includes a first resistor, one end of which is connected to the power supply, and the other end of which is connected to the second switch and the first relay respectively.

5. The charging circuit according to claim 3, characterized in that: The first charging circuit further includes a first relay control circuit, one end of the first relay control circuit is connected to the first relay, and the other end of the first relay control circuit is connected to the control circuit.

6. The charging circuit according to claim 3, characterized in that: The second charging circuit includes a second relay, one end of the second relay is connected to the first switch and the second switch respectively, and the other end of the second relay is connected to the driving circuit.

7. The charging circuit according to claim 6, characterized in that: The second charging circuit further includes a second relay control circuit, one end of the second relay control circuit is connected to the second relay, and the other end of the second relay control circuit is connected to the control circuit.

8. An air conditioner, characterized in that: It comprises a power supply, a control circuit, a drive circuit and a charging circuit as claimed in any one of claims 1 to 7.

9. A control method, characterized in that: For controlling the air conditioner as claimed in claim 8, the method comprising: Controlled by a start-up instruction for starting the air conditioner, voltage detection is performed on a drive circuit of the air conditioner to obtain a bus voltage; If the bus voltage is less than a preset threshold, the switch circuit of the charging circuit of the air conditioner is controlled to be turned on so that the power supply supplies power to the driving circuit through the second power supply circuit.

10. The method according to claim 9, characterized in that The method further comprises: If the bus voltage is greater than or equal to the preset threshold, the switch circuit is controlled to be disconnected so that the power supply supplies power to the drive circuit through the first power supply loop.

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