Control circuit and air conditioner

Abstract

The embodiment of the utility model relates to a control circuit and an air conditioner. The control circuit comprises a load; the power supply module is used for outputting direct-current voltage; the intelligent power IPM module is respectively connected with the load and the power supply module, and is used for supplying power to the load based on the direct current voltage and controlling the operation state of the load; the voltage detection module is connected with the IPM module and used for detecting the output voltage of the IPM module to obtain a voltage detection result; the control module is respectively connected with the IPM module and the voltage detection module, and is used for inputting a control signal to the IPM module according to the voltage detection result, so that the IPM module adjusts the running state of the load based on the control signal; and the control module is further used for controlling the IPM module to be closed under the condition that the standby instruction or the shutdown instruction is received, so that the access between the power supply module and the voltage detection module is disconnected. According to the control circuit and the air conditioner, power consumption generated by the voltage detection module can be reduced, and power consumption waste is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a control circuit and an air conditioner. Background Art

[0002] Currently, to ensure that IPM (Intelligent Power Module) modules operate within a safe voltage range, the industry generally uses a voltage detection circuit directly on the IPM module's busbar to detect the busbar voltage and assess its voltage status. In this solution, the voltage detection circuit causes unnecessary power loss. Utility Model Content

[0003] The embodiments of the present application disclose a control circuit and an air conditioner, which can reduce the power consumption generated by a voltage detection module and reduce power waste.

[0004] In a first aspect, an embodiment of the present application discloses a control circuit, comprising:

[0005] load;

[0006] A power module, used for outputting DC voltage;

[0007] an intelligent power IPM module, connected to the load and the power supply module respectively, the IPM module being configured to supply power to the load based on the DC voltage and to control the operating state of the load;

[0008] A voltage detection module is connected to the IPM module, and is used to detect the output voltage of the IPM module and obtain a voltage detection result;

[0009] a control module, connected to the IPM module and the voltage detection module respectively, for inputting a control signal to the IPM module according to the voltage detection result, so that the IPM module adjusts the operating state of the load based on the control signal; and

[0010] The control module is further configured to control the IPM module to shut down when receiving a standby instruction or a shutdown instruction, so as to disconnect the path between the power module and the voltage detection module.

[0011] In an embodiment of the present application, the voltage detection module is connected to the IPM module instead of being directly connected to the power module. In the standby state or the shutdown state, the IPM module will be turned off, so that the path between the power module and the voltage detection module is disconnected. The voltage detection module cannot continuously detect the voltage, thereby reducing the power consumption generated by the voltage detection module and reducing power waste.

[0012] As an optional implementation, in the first aspect of the embodiment of the present application, the IPM module includes a plurality of phase units connected in parallel; each phase unit includes two switches connected in series; the connection midpoint between the two switches in each phase unit is connected to the voltage detection module.

[0013] In this embodiment, the IPM module can adjust the power output capacity of the IPM module according to actual needs by connecting multiple phase units in parallel to better adapt to the requirements of different loads; and, connecting the voltage detection module to the midpoint of the connection between the two switches in each phase unit can allow the voltage detection module to more accurately monitor the output voltage of each phase unit.

[0014] As an optional implementation, in the first aspect of the embodiment of the present application, the voltage detection module includes: a protection unit connected to the IPM module, and the protection unit is used to control the unidirectional transmission of voltage.

[0015] In this embodiment, the voltage in the voltage detection module can be prevented from being transmitted from the low-voltage end to the high-voltage end, thereby improving the safety and stability of the circuit.

[0016] As an optional embodiment, in the first aspect of the embodiment of the present application, the protection unit includes a plurality of diodes, and the plurality of diodes correspond one-to-one to the plurality of phase units, and the anode of each of the diodes is respectively connected to the connection midpoint between the two switches in the corresponding phase unit.

[0017] In this embodiment, the diode has unidirectional conductivity, and the anode of the diode is respectively connected to the connection midpoint between the two switches in the corresponding phase unit, which can effectively prevent the reverse transmission of the voltage in each phase unit and improve the safety and stability of the circuit.

[0018] As an optional implementation, in the first aspect of the embodiment of the present application, one switch in each phase unit is an upper switch, and the other switch is a lower switch, the upper switch is connected to the power supply module, and the lower switch is grounded; the control module is also used to control the upper switch in each phase unit to be in the disconnected state when receiving the standby instruction or the shutdown instruction.

[0019] In this embodiment, in the standby state or the shutdown state, the upper switch in each phase unit in the IPM module is disconnected, thereby disconnecting the path between the voltage detection module and the power supply module. In this way, the voltage detection module will not continuously detect the voltage, thereby reducing the power consumption generated by the voltage detection module.

[0020] As an optional implementation manner, in the first aspect of the embodiment of the present application, the load is connected to a connection midpoint between two switches in the multiple phase units.

[0021] In this embodiment, by connecting the load to the phase unit, AC power can be provided to the load, thereby more accurately controlling the operating state of the load.

[0022] As an optional implementation, in the first aspect of the embodiment of the present application, the voltage detection module includes: a voltage dividing unit, configured to divide the output voltage of the IPM module to obtain the voltage detection result.

[0023] In this embodiment, the output voltage is reduced to a range that the voltage detection module can withstand through the voltage divider unit of the voltage detection module, thereby avoiding direct detection of the high output voltage of the IPM module and reducing component damage to the voltage detection module.

[0024] As an optional implementation, in the first aspect of the embodiment of the present application, the voltage divider unit includes a first resistor and a second resistor connected in series; the resistance of the first resistor is greater than the resistance of the second resistor; and one end of the first resistor is connected to the IPM module, and one end of the second resistor is grounded; the connection midpoint between the first resistor and the second resistor is connected to the control module.

[0025] In this embodiment, voltage division can be effectively achieved by connecting the first resistor and the second resistor in series; and the midpoint between the first resistor and the second resistor is connected to the control module, so that the voltage detection result obtained by the voltage detection module can be accurately fed back and transmitted to the control module to improve the accuracy of the control signal output by the control module.

[0026] As an optional implementation manner, in the first aspect of the embodiment of the present application, the load includes any one of a compressor, an indoor fan, and an outdoor fan.

[0027] In this embodiment, the control circuit can adapt to different application scenarios and load requirements.

[0028] In a second aspect, an embodiment of the present application discloses an air conditioner, comprising a control circuit as described in any one of the above items.

[0029] In an embodiment of the present application, an air conditioner including the above-mentioned control circuit can connect the voltage detection module with the IPM module in the control circuit instead of directly connecting it to the power module, and in the standby state or the shutdown state, the IPM module in the control circuit will be turned off, so that the path between the power module and the voltage detection module is disconnected, and the voltage detection module cannot continuously detect the voltage, thereby reducing the power consumption generated by the voltage detection module and reducing the power consumption waste of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Schematic diagram of the structure of a control circuit in one embodiment;

[0032] Figure 2a is a structural block diagram of a control circuit in one embodiment;

[0033] Figure 2b is a circuit structure diagram of a voltage divider unit in one embodiment;

[0034] Figure 3a is a structural block diagram of a control circuit in one embodiment;

[0035] Figure 3b is a circuit structure diagram of a phase unit in one embodiment;

[0036] Figure 4 is a structural block diagram of a control circuit in one embodiment;

[0037] Figure 5 Schematic diagram of the structure of an air conditioner in one embodiment. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] It should be noted that the terms "including," "having," and any variations thereof in the embodiments and drawings of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to the process, method, product, or apparatus.

[0040] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. Both the first resistor and the second resistor are resistors, but they are different resistors.

[0041] In air conditioning systems, the IPM module, as the core control component of the entire system, is responsible for driving critical loads such as the compressor and for power conversion and control. Its stable operation is crucial to ensuring air conditioning performance. However, IPM modules are extremely sensitive to voltage. Excessively low or high bus voltages can cause module overheating, overvoltage breakdown, and even cause the controller to explode, seriously threatening user safety and system stability.

[0042] In related technologies, a voltage detection circuit is installed on the busbar based on the principle of resistor voltage division to detect the voltage of the IPM module. Specifically, a resistor or a group of resistors are connected in series with the IPM module's DC busbar. The voltage across these resistors is measured to estimate the busbar voltage. This method is simple to implement, but it has a number of practical problems, especially in reducing the standby power consumption of the entire system.

[0043] The voltage detection circuit on the IPM module busbar remains in continuous operation throughout the air conditioning system's lifecycle, including in standby and off modes. This means that even when the air conditioner is not running, the voltage detection circuit is still detecting voltage and continuously consuming power from the power supply. Although the power consumption of the voltage detection circuit in standby and off modes is lower than when the air conditioner is running, the long-term cumulative power consumption will lead to an increase in the standby power of the entire system, directly reducing the air conditioner's energy efficiency.

[0044] The embodiments of the present application disclose a control circuit and an air conditioner, which can reduce the power consumption of the control circuit when the air conditioner is in a standby state or a shutdown state.

[0045] Figure 1 FIG. 1 is a structural block diagram of a control circuit in one embodiment. Figure 1 As shown, in one embodiment, the control circuit 100 includes one or more of the following components: a load 110, a power module 120, an IPM module 130, a voltage detection module 140, and a control module 150. The IPM module 130 is connected to the load 110 and the power module 120, respectively; the voltage detection module 140 is connected to the IPM module 130; and the control module 150 is connected to the IPM module 130 and the voltage detection module 140, respectively.

[0046] In some embodiments, the output of the IPM module 130 is connected to the load 110, the input of the control module 150, and the input of the voltage detection module 140. The output of the voltage detection module 140 is connected to the input of the control module 150. The output of the control module 150 is connected to the input of the IPM module 130.

[0047] In some embodiments, the load 110 may refer to power-consuming devices such as motors and compressors in the air-conditioning system, which require electricity to operate. Specifically, the load 110 includes any one of a compressor, an indoor fan, an outdoor fan, and a motor.

[0048] For example, the compressor can increase the temperature and pressure of the inhaled low-temperature, low-pressure refrigerant vapor by compressing it, so as to activate the refrigerant in the air conditioner and achieve the purpose of cooling through heat-to-work conversion.

[0049] For example, the indoor fan is used to transport cold air or hot air into the room, and transport the hot air or cold air in the room to the outside through the air-conditioning duct to achieve the effect of cooling or heating.

[0050] In some embodiments, the power module 120 is connected to the IPM module 130 and the control module 150 respectively, and is configured to output a DC voltage to provide the required power to the IPM module 130 and the control module 150. For example, the power module 120 may provide a 15V power supply to the IPM module 130.

[0051] For example, the power module 120 can convert the input power signal (such as AC or DC) into a stable and reliable DC power supply that meets the requirements of the IPM module 130 and the control module 150 through rectification or filtering through internal circuit processing.

[0052] In some embodiments, the IPM module 130 is configured to supply power to the load 110 based on the DC voltage provided by the power module 120 and to control the operating state of the load 110 .

[0053] In some embodiments, the operating status of the load 110 may include the operating speed, power, torque, temperature, current, operating mode (such as start-up mode, normal operating mode, energy-saving mode, standby mode, etc.), phase angle, etc. of the load 110.

[0054] For example, the IPM module 130 can achieve precise control of the rotation speed of the load 110 by adjusting the frequency and duty cycle of the power semiconductor device.

[0055] In some embodiments, the IPM module 130 may further include a busbar for collecting, distributing, and transmitting electrical energy. Specifically, the IPM module 130 may convert the DC voltage of the busbar into a three-phase AC voltage or other voltage form according to a control signal to meet load requirements.

[0056] In some embodiments, IPM module 130 includes multiple power semiconductor devices. Specifically, after receiving a control signal from the control module, IPM module 130 converts the control signal into a gate signal suitable for the power semiconductor device, enabling rapid switching of the power semiconductor device. When the power semiconductor devices in IPM module 130 are in the on state, current flows through load 110, providing power to load 110. When the power semiconductor devices are in the off state, the current is cut off, meaning that IPM module 130 is shut down and cannot power load 110.

[0057] In some embodiments, the control module 150 can receive the DC voltage from the power module 120 and, based on preset logic or external commands, input control commands to the IMP module to adjust the operating state of the load 110. External commands may include commands such as temperature and wind speed set by the user of the air conditioning system through the corresponding remote control of the air conditioning system.

[0058] In some embodiments, the control module 150 may also include a monitoring unit for generating a control instruction to shut down the IPM module 130 when an abnormal condition (such as excessive current, voltage fluctuation, etc.) is detected in the load 110, so that the IPM module 130 stops supplying power to the load 110 to protect the load 110 and the entire air-conditioning system from damage.

[0059] In some embodiments, the voltage detection module 140 is used to detect the output voltage of the IPM module 130 to obtain a voltage detection result; and feed the voltage detection result back to the control module 150 .

[0060] In some embodiments, the voltage detection module 140 can utilize the principle of resistance voltage division to reduce the output voltage of the IPM module 130 through a series resistor according to a preset resistance ratio to a range that can be processed by a measuring instrument (such as a voltmeter or an analog-to-digital converter), so as to determine the voltage detection result based on the voltage value measured by the measuring instrument and the preset resistance ratio.

[0061] In some embodiments, the voltage detection module 140 may include a high-precision voltage sensor or detection chip, such as a Hall effect voltage sensor. The high-precision voltage sensor or detection chip directly measures the output voltage of the IPM module 130 and converts the voltage measurement result into a digital signal or an analog signal, which is then output to the control module 150.

[0062] In some embodiments, the control module 150 is configured to input a control signal to the IPM module 130 according to the voltage detection result transmitted by the voltage detection module 140 , so that the IPM module 130 adjusts the operating state of the load 110 based on the control signal.

[0063] For example, the control module 150 determines an adjustment method for the load 110 based on the voltage detection result, generates a corresponding PWM (Pulse Width Modulation) signal based on the adjustment method, and transmits the PWM signal to the IPM module 130. The IPM module 130 adjusts the operating state of the load 110 based on the received PWM signal.

[0064] In some embodiments, if the control module 150 determines, based on the voltage detection result, that the output voltage of the IPM module 130 is too large, the control module 150 adjusts the duty cycle of the PWM signal so that, within each cycle of the PWM signal, the conduction time of the power semiconductor devices of the IPM module 130 becomes shorter, resulting in a decrease in the output voltage of the IPM module 130. This causes the IPM module 130 to reduce the supply voltage to the load 110, thereby weakening the operating state of the load 110 (for example, reducing the operating speed).

[0065] In some embodiments, the control module 150 is further configured to control the IPM module to shut down upon receiving a standby command or a shutdown command, thereby disconnecting the path between the power module and the voltage detection module. A standby command is a command that places the air conditioning system in a low-power state, thereby shutting down or reducing unnecessary power output in the current standby state to reduce energy consumption; a shutdown command is a command that completely shuts down the air conditioning system.

[0066] In one embodiment, the control module 150 may include an MCU (Microcontroller Unit) chip, etc.

[0067] In an embodiment of the present application, the voltage detection module 140 is connected to the IPM module 130 instead of being directly connected to the power module 120. In the standby state or the shutdown state, the IPM module 130 will be turned off, so that the path between the power module 120 and the voltage detection module 140 is disconnected, and the voltage detection module 140 cannot continuously detect the voltage, thereby reducing the power consumption generated by the voltage detection module 140 and reducing power waste.

[0068] Figure 2a FIG. 4 is a structural block diagram of a control circuit in one embodiment.

[0069] In some embodiments, as Figure 2aAs shown, voltage detection module 140 includes a voltage divider 141, which is connected to IPM module 130 and is used to divide the output voltage of IPM module 130 to obtain a voltage detection result. The voltage divider of voltage detection module 140 reduces the output voltage to a range that voltage detection module 140 can withstand, avoiding direct detection of the high output voltage of IPM module 130 and reducing damage to components of voltage detection module 140.

[0070] Exemplarily, the voltage dividing unit 141 may also be connected to the control module 150 to transmit the obtained voltage detection result to the control module 150 .

[0071] For example, if the IPM module 130 provides AC power to the load 110 , the voltage detection module 140 may include a transformer, and the output voltage of the IPM module 130 may be increased or decreased by adjusting the turns ratio between the primary side and the secondary side.

[0072] For example, since capacitors of different capacitance values ​​exhibit different impedances in an AC circuit, thereby achieving voltage division, if the IPM module 130 provides AC power to the load 110, the voltage divider 141 of the voltage detection module 140 may include multiple capacitors connected in series. The voltage distributed across each capacitor is inversely proportional to its capacitance. That is, capacitors with larger capacitance have lower voltages distributed across them, while capacitors with smaller capacitance have higher voltages distributed across them.

[0073] In some embodiments, the voltage dividing unit 141 is mainly based on the series voltage dividing principle of resistors in Ohm's law, such as Figure 2b As shown, the voltage divider unit 141 may include multiple resistors connected in series to perform voltage division. The voltage borne by a resistor is proportional to the resistance value of the resistor, that is, a resistor with a larger resistance value bears a higher voltage, and a resistor with a smaller resistance value bears a lower voltage.

[0074] Exemplarily, the voltage divider unit 141 includes a first resistor and a second resistor connected in series; the resistance of the first resistor is greater than the resistance of the second resistor; and one end of the first resistor is connected to the IPM module 130, the other end is connected to the second resistor, and the other end of the second resistor is grounded.

[0075] In some embodiments, a midpoint between the first resistor and the second resistor is connected to the control module 150 .

[0076] Since the resistance of the first resistor is greater than the resistance of the second resistor, the first resistor bears more voltage and the second resistor bears a smaller voltage. Since one end of the second resistor is grounded and the other end is connected to the control module, the smaller voltage value of the second resistor can be directly read by the voltage detection module 140, so that the voltage detection result obtained by the voltage detection module 140 can be accurately fed back and transmitted to the control module to improve the accuracy of the control signal output by the control module 150.

[0077] In some embodiments, as Figure 2b As shown, the voltage detection module 140 divides the output voltage of the IPM module 130 through resistors R1 and R2. Since the resistance of resistor R1 is greater than that of resistor R2, the voltage divided by resistor R2 is less than that of resistor R1. The voltage detection module 140 transmits the voltage detection result of resistor R2 to the control module 150. The control module 150 determines the output voltage of the IPM module 130 based on the voltage detection result of resistor R2 and the ratio of the resistance of resistor R2 to the resistance of resistor R1, thereby accurately adjusting and controlling the output voltage of the IPM module 130 to prevent the IPM module 130 from operating at too low or too high a voltage and causing damage.

[0078] Figure 3a FIG. 4 is a structural block diagram of a control circuit in one embodiment.

[0079] In some embodiments, as Figure 3a As shown, the IPM module 130 may include a plurality of phase units 131 connected in parallel. For example, the IPM module may include three phase units 131 to provide three-phase AC power to the load 110.

[0080] Exemplarily, the control module 150 and each phase unit 131 respectively operate at least one connection line for transmitting a control signal to control each phase unit 131 respectively.

[0081] In some embodiments, the phase unit may be composed of power electronic devices such as IGBT (Insulated Gate Bipolar Transistor), MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), BJT (Bipolar Junction Transistor), GTO (Gate Turn-Off Thyristor), etc., which have the characteristics of fast switching speed, flexible control, and the ability to withstand high voltage and large current.

[0082] Phase unit 131 can convert the power provided by power module 120 into the power form required by load 110. By connecting multiple phase units 131 in parallel, IPM module 130 can adjust the power output capacity of IPM module 130 according to actual needs to better meet the requirements of different loads 110.

[0083] In some embodiments, the IPM module 130 controls the phase unit 131 to supply power to the load 110 according to the control signal transmitted by the control module 150 .

[0084] Taking a MOS transistor as an example, after the control signal reaches the IPM module 130, the IPM module 130 decodes and converts the control signal to identify the specific content and requirements of the control signal. Based on the decoded control signal, the IPM module 130 then generates a drive signal that can drive the MOS transistor on or off. When the drive signal causes the voltage between the gate (G) and source (S) of the MOS transistor to reach or exceed its threshold voltage, the MOS transistor turns on, allowing current to flow from the drain (D) to the source (S), thereby providing power to the load 110. When the drive signal causes the voltage between the gate (G) and source (S) to fall below its threshold voltage, the MOS transistor turns off, preventing current from flowing. This means that the IPM module 130 is shut down and no power is supplied to the load 110.

[0085] Exemplarily, the gate (G) of each MOS transistor in the phase unit 131 is connected to the control module 150, so that the control module 150 can directly control the on and off state of the MOS transistor by outputting a control signal to the gate of the MOS transistor, thereby controlling the output voltage of the IPM module 130.

[0086] Figure 3b FIG. 4 is a circuit structure diagram of a phase unit in one embodiment.

[0087] In some embodiments, as Figure 3b As shown, each phase unit 131 includes two switches connected in series, wherein one switch in each phase unit 131 is an upper switch and the other switch is a lower switch, the upper switch is connected to the power module 120, and the lower switch is grounded.

[0088] Optionally, the connection midpoint between the two switches in each phase unit 131 is connected to the voltage detection module 140 , so that the voltage detection module 140 can more accurately monitor the output voltage of each phase unit 131 .

[0089] Optionally, the load 110 is connected to the midpoint between the two switches in each phase unit 131. This allows for providing AC power to the load 110, thereby more accurately controlling the operating state of the load 110.

[0090] In some embodiments, as Figure 3a As shown, the voltage detection module 140 may include a protection unit 142 , and the protection unit 142 is connected to the IPM module 130 .

[0091] Exemplarily, the protection unit 142 is used to control unidirectional voltage transmission, that is, to control the output voltage of the IPM module 130 to flow unidirectionally into the voltage detection module 140, thereby preventing the low voltage in the voltage detection module 140 from flowing back into the IPM module 130 and causing a short circuit, thereby improving the safety and stability of the circuit.

[0092] In some embodiments, the protection unit may include multiple diodes, and the multiple diodes correspond one-to-one to the multiple phase units. Since the unidirectional transmission of the diode can only be transmitted from the diode anode to the diode cathode, the anode of each diode is connected to the midpoint between the two switches in the corresponding phase unit.

[0093] In some embodiments, the protection unit may also include a voltage regulator diode to ensure unidirectional transmission of the voltage signal and limit the voltage range. Specifically, the forward conduction characteristics of the diode can block reverse current from entering the voltage detection module; the voltage regulator diode can automatically reduce the voltage value when the voltage is too high, protecting subsequent circuits from damage.

[0094] Figure 4 FIG. 1 is a block diagram of a control circuit in one embodiment. Figure 4 The markings are as follows: "L" represents the live wire; "N" represents the neutral wire; "12V" between the power module 120 and the control module 150 represents that the power module 120 provides 12V power to the control module 150; "5V" represents that the power module 120 provides 5V power to the control module 150; "VDC(P)" between the power module 120 and the IPM module 130 represents that the power module 120 provides DC voltage volts to the control module 150; "15V" represents that the power module 120 provides 15V power to the IPM module 130; "GND" represents the ground wire.

[0095] In some embodiments, as Figure 4 As shown, Figure 4 As shown, the IPM module 130 may include three phase units 131 (e.g., U-phase, V-phase, and W-phase) consisting of six MOSFETs. In the three phase units 131 of the IPM module 130, the upper switch is also called the upper bridge, and the lower switch is also called the lower bridge. The U-phase upper bridge (U+) and lower bridge (U-) are composed of two MOSFETs connected in series; the V-phase upper bridge (V+) and lower bridge (V-) are composed of another two MOSFETs connected in series. The W-phase upper bridge (W+) and lower bridge (W-) are composed of the last two MOSFETs connected in series.

[0096] One end of the upper switches (U+, V+, and W+) is connected to the power module 120 and receives the VDC(P) power from the power module 120. One end of the lower switches (U-, V-, and W-) is grounded. The IPM module 130 supplies power to the load 110 by controlling the voltage difference between the upper and lower switches.

[0097] In some embodiments, the control module 150 controls the on and off states of each switch (upper bridge and / or lower bridge) in the IPM module 130 by inputting a control signal to the IPM module 130 to control the output voltage of the IPM module 130 .

[0098] For example, when the control module 150 receives a standby command or a shutdown command, it controls the upper switch (upper bridge) in each phase unit 131 to be in an off state to control the IPM module 130 to be disconnected, thereby disconnecting the path between the power module 120 and the voltage detection module 140, so that when the IPM module 130 does not need to power the load 110, the voltage detection module 140 can stop detecting the voltage, thereby reducing the power consumption generated by the voltage detection module 140 and reducing power waste.

[0099] Exemplarily, when the control module 150 receives a start instruction, it controls the upper switch (U+ or V+ or W+) of any phase unit 131 (U phase or V phase or W phase) in the IPM module 130 to be in the on state, and the lower switch (U+ or V+ or W+) to be in the off state, so that the positive pole of the VDC (P) power supply is connected to one end of the load 110 through the turned-on upper switch, and the other end of the load 110 is connected to the negative pole or ground of the power module 120 through the lower bridge (or other circuit path) that may be turned on in other phase units 131, thereby forming a current path to power the load 110.

[0100] For example, when load 110 is a motor, IPM module 130 can control the motor's forward or reverse rotation. When the motor needs to rotate forward, IPM module 130 controls three MOSFETs in phase unit 131 (e.g., U+ and W+ of the upper switch and V- of the lower switch) to be on, while the other three MOSFETs are off. This causes current to flow through the motor in the predetermined direction, generating forward torque.

[0101] When the motor needs to reverse, the IPM module 130 changes the conduction state of the MOS tubes, turning on the three MOS tubes that were originally in the off state and turning off the three MOS tubes that were originally in the on state. The direction of the current changes, thereby generating a reverse torque for the motor.

[0102] In some embodiments, as Figure 4As shown, the protection unit 142 of the voltage detection module 130 may include three diodes ( V1 , V2 , and V3 ), which are respectively connected to the three phase units 131 of the IPM module 130 .

[0103] Specifically, the diode V1 corresponds to the phase unit 131 in the IPM module 130, which includes the upper switch U+ and the lower switch U−. Moreover, the anode of the diode V1 is connected to the midpoint between the upper switch U+ and the lower switch U−, so that the output voltage of the IPM module 130 can flow unidirectionally from the phase unit 131 of the IPM module 130 to the voltage divider unit 141 of the voltage detection module 140, and does not flow from the voltage divider unit 141 to the phase unit 131.

[0104] In some embodiments, as Figure 4 As shown, the voltage divider unit 141 of the voltage detection module 130 may include two resistors (R1 and R2). One end of resistor R1 may be connected to the multiple diodes of the protection unit 142, and the other end of resistor R1 is connected to resistor R2, and the other end of resistor R2 is grounded. The midpoint between resistors R1 and R2 is connected to the control module 150 to provide feedback of the voltage detection results to the control module 150.

[0105] Exemplarily, the voltage divider unit 141 feeds the detected voltage value of the resistor R2 back to the control module 150. The control module 150 determines the output voltage value of the phase unit 131 of the IPM module 130 based on the voltage value and the ratio of the resistor R1 to the resistor R2. If the control module 150 detects that the output voltage value of the IPM module 130 is lower than the voltage value required by the load 110, the control module 150 increases the frequency of the PWM signal to control the IPM module 130 so that the phase unit 131 of the IPM module 130 is turned on for a shorter period of time within each cycle of the PWM signal. This increases the output voltage of the IPM module 130 and causes the IPM module 130 to increase the voltage supplied to the load 110 to achieve the voltage value required by the load 110.

[0106] For example, in order to ensure that the voltage value obtained by the voltage division of the resistor R2 is exactly within the detection range of the voltage detection module 140, or is exactly within the detection range of the control module 150, the ratio of the resistance value of the resistor R1 to the resistance value of the resistor R2 needs to be larger, so that most of the output voltage of the IPM module 130 falls on the resistor R1, while the resistance value of the resistor R2 is reduced.

[0107] In some embodiments, the grounding resistor R3 can balance the current distribution in the control circuit 100 , reduce circuit fluctuations and signal fluctuations (ie, electromagnetic interference) caused by current mutations, and thus improve the overall stability of the control circuit 100 .

[0108] For example, during extreme weather conditions such as lightning, grounding resistor R3 can divert lightning into the ground, preventing it from damaging the control circuit 100 and the air conditioner. Furthermore, if the control circuit 100 is short-circuited or overloaded, grounding resistor R3 can limit the current flow, preventing damage to the control circuit 100 due to overcurrent.

[0109] In some embodiments, as Figure 5 As shown, the air conditioner 200 of the embodiment of the present application may include the control circuit 100 of the above embodiment.

[0110] In an embodiment of the present application, the air conditioner 200 including the above-mentioned control circuit 100 can connect the voltage detection module to the IPM module through the control circuit 100 instead of directly connecting it to the power module, and in the standby state or the shutdown state, the IPM module in the control circuit 100 will be turned off, so that the path between the power module and the voltage detection module is disconnected, and the voltage detection module cannot continuously detect the voltage, thereby reducing the power consumption generated by the voltage detection module and reducing the power consumption waste of the air conditioner 200.

[0111] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0112] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0113] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of these units may be selected based on actual needs to achieve the objectives of this embodiment.

[0115] In addition, the functional units in the embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0116] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a memory and includes several requests for a computer device (which can be a personal computer, server or network device, etc., specifically a processor in a computer device) to execute some or all of the above steps of the various embodiments of the present application.

[0117] Those skilled in the art will appreciate that all or part of the steps in the foregoing embodiments may be accomplished by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, including a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0118] The control circuit and air conditioner disclosed in the embodiments of this application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of this application. The description of the above embodiments is intended only to help understand this application and its core concept. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concepts of this application. In summary, the contents of this specification should not be construed as limiting this application.

Claims

1. A control circuit, characterized in that: include: load; A power module, used for outputting DC voltage; an intelligent power IPM module, connected to the load and the power supply module respectively, the IPM module being configured to supply power to the load based on the DC voltage and to control the operating state of the load; A voltage detection module is connected to the IPM module, and is used to detect the output voltage of the IPM module and obtain a voltage detection result; a control module, connected to the IPM module and the voltage detection module respectively, for inputting a control signal to the IPM module according to the voltage detection result, so that the IPM module adjusts the operating state of the load based on the control signal; and The control module is further configured to control the IPM module to shut down when receiving a standby instruction or a shutdown instruction, so as to disconnect the path between the power module and the voltage detection module.

2. The control circuit according to claim 1, wherein: The IPM module includes a plurality of phase units connected in parallel; each phase unit includes two switches connected in series; and a connection midpoint between the two switches in each phase unit is connected to the voltage detection module.

3. The control circuit according to claim 2, characterized in that: The voltage detection module includes: A protection unit is connected to the IPM module, and is used to control unidirectional voltage transmission.

4. The control circuit according to claim 3, characterized in that: The protection unit includes a plurality of diodes, and the plurality of diodes correspond to the plurality of phase units one by one. The anode of each diode is respectively connected to a connection midpoint between two switches in the corresponding phase unit.

5. The control circuit according to claim 2, wherein: One switch in each phase unit is an upper switch, and the other switch is a lower switch. The upper switch is connected to the power supply module, and the lower switch is grounded. The control module is also used to control the upper switch in each phase unit to be in an off state when receiving the standby instruction or the shutdown instruction.

6. The control circuit according to claim 2, characterized in that: The load is connected to a connection midpoint between two switches in the plurality of phase units.

7. The control circuit according to any one of claims 1 to 6, characterized in that: The voltage detection module includes: The voltage dividing unit is used to divide the output voltage of the IPM module to obtain the voltage detection result.

8. The control circuit according to claim 7, characterized in that: The voltage divider unit includes a first resistor and a second resistor connected in series; the resistance of the first resistor is greater than the resistance of the second resistor; and one end of the first resistor is connected to the IPM module, and one end of the second resistor is grounded; the connection midpoint between the first resistor and the second resistor is connected to the control module.

9. The control circuit according to claim 1, wherein: The load includes any one of a compressor, an indoor fan, and an outdoor fan.

10. An air conditioner, characterized in that: The method comprises the control circuit according to any one of claims 1 to 9.

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