Air conditioner outdoor unit, control method, controller and outdoor unit

Abstract

The invention discloses an air conditioner outdoor unit, a control method, a controller and an outdoor unit. According to the power supply scheme, a single power supply winding is adopted for power supply; the power supply winding is converted into voltage for supplying power to a first inversion driving module of the first fan and voltage for supplying power to a second inversion driving module of the second fan through a first voltage conversion circuit, and the first voltage conversion circuit provides voltage input for a second voltage conversion circuit; the second voltage conversion circuit is used for converting the voltage for supplying power to the first control module of the first fan and the voltage for supplying power to the second control module of the second fan, so that one winding of the transformer can be used for supplying power to the control modules of the two fans and the inversion driving module through the power supply mode; and two secondary side windings and two sets of transformers are not needed, so that transformer winding resources are saved, and the layout and wiring design of other circuits of the PCB is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner control, and in particular to an air conditioner outdoor unit, a control method, a controller and an outdoor unit. BACKGROUND

[0002] Currently, some outdoor units adopt two fans distributed in up and down directions to assist the heat exchanger of the outdoor unit in heat exchange, which requires that the corresponding control board needs to have two working circuits, respectively, for supplying power to the circuit of the control chip of the two fans and the circuit of the inverter driving chip.

[0003] There are two commonly used power supply schemes for the working circuit of the fan. One is that the transformer includes two secondary side windings, each of which corresponds to a working circuit, so that the working circuits of the two fans can be completely isolated, but the deficiency is that an independent winding needs to be added in the switching power supply, which increases the cost. The other is double power supply, one switching power supply is specially used to supply power to the circuit of the control chip, and the other switching power supply is specially used to supply power to the circuit of the inverter driving chip, but the deficiency is that the area of the main control board is increased, the electrical control cost is increased, and the production efficiency is reduced. SUMMARY

[0004] The embodiments of the present application provide an air conditioner outdoor unit, a control method, a controller and an outdoor unit, which can save transformer winding resources and are beneficial to the layout and wiring design of other circuits of the PCB.

[0005] In a first aspect, the embodiments of the present application provide an air conditioner outdoor unit, which comprises a power supply circuit, a first fan and a second fan, and the power supply circuit comprises:

[0006] a first voltage conversion circuit, a voltage input end of the first voltage conversion circuit being connected to a power supply output end of a power supply winding, and a voltage output end of the first voltage conversion circuit being used to supply power to a first inverter driving module corresponding to the first fan and a second inverter driving module corresponding to the second fan;

[0007] a second voltage conversion circuit, a voltage input end of the second voltage conversion circuit being connected to a voltage output end of the first voltage conversion circuit, and a voltage output end of the second voltage conversion circuit being used to supply power to a first control module corresponding to the first fan and a second control module corresponding to the second fan.

[0008] In some embodiments, the second voltage conversion circuit includes a first voltage conversion module and a second voltage conversion module, a voltage input end of the first voltage conversion module and a voltage input end of the second voltage conversion module are both connected to a voltage output end of the first voltage conversion circuit, a voltage output end of the first voltage conversion module is used to supply power to the first control module, and a voltage output end of the second voltage conversion module is used to supply power to the second control module.

[0009] In some embodiments, the outdoor unit further includes a first sampling circuit, the first inverter drive module includes a first NU pin, a first NV pin, and a first NW pin, and the first NU pin, the first NV pin, and the first NW pin are all connected to the first control module through the first sampling circuit.

[0010] In some embodiments, the first sampling circuit includes a first sampling resistor and a first operational amplifier circuit, the first NU pin, the first NV pin, and the first NW pin are all grounded through the first sampling resistor, a connection point of the first NU pin and the first sampling resistor is connected to an inverting input end of the first operational amplifier circuit, and a non-inverting input end of the first operational amplifier circuit is connected to a first reference voltage source.

[0011] In some embodiments, the first reference voltage source is connected to a voltage output end of the second voltage conversion circuit to output a first reference voltage.

[0012] In some embodiments, the outdoor unit further includes a second sampling circuit, the second inverter drive module includes a second NU pin, a second NV pin, and a second NW pin, and the second NU pin, the second NV pin, and the second NW pin are all connected to the second control module through the second sampling circuit.

[0013] In some embodiments, the second sampling circuit includes a second sampling resistor and a second operational amplifier circuit, the second NU pin, the second NV pin, and the second NW pin are all grounded through the second sampling resistor, a connection point of the second NU pin and the second sampling resistor is connected to a non-inverting input end of the second operational amplifier circuit, and an inverting input end of the second operational amplifier circuit is connected to a second reference voltage source.

[0014] In some embodiments, the second reference voltage source is connected to a voltage output end of the second voltage conversion circuit to output a second reference voltage.

[0015] In some embodiments, the first fan is arranged above the second fan.

[0016] In a second aspect, embodiments of the present application also provide a control method applied to the outdoor unit of the air conditioner of the first aspect; the control method comprises:

[0017] In response to the start instruction, determining that the fan needs to be started;

[0018] If it is determined that the first fan and the second fan need to be started simultaneously, controlling the first inverter drive module to drive the first fan at a first carrier frequency through the first control module, and controlling the second inverter drive module to drive the second fan at a second carrier frequency through the second control module, the first carrier frequency and the second carrier frequency being different.

[0019] In some embodiments, the control method further comprises:

[0020] If it is determined that the first fan needs to be started alone, controlling the first inverter drive module to drive the first fan at a first carrier frequency through the first control module;

[0021] If it is determined that the second fan needs to be started alone, controlling the second inverter drive module to drive the second fan at a second carrier frequency through the second control module.

[0022] In some embodiments, the control method further comprises:

[0023] After starting the first fan alone, in response to the start instruction of the second fan, controlling the second inverter drive module to drive the second fan at a second carrier frequency through the second control module;

[0024] Or, after starting the second fan alone, in response to the start instruction of the first fan, controlling the first inverter drive module to drive the first fan at a first carrier frequency through the first control module.

[0025] In some embodiments, the frequency difference between the first carrier frequency and the second carrier frequency is a preset frequency value.

[0026] In a third aspect, embodiments of the present application provide a controller comprising at least one processor and a memory connected in communication with the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the control method of the second aspect.

[0027] In a fourth aspect, embodiments of the present application provide an outdoor unit comprising the controller of the third aspect.

[0028] The air conditioner outdoor unit, the control method, the controller and the outdoor unit provided by the embodiments of the present application have at least the following beneficial effects: for the outdoor unit with a first fan and a second fan, the embodiments of the present application adopt a single power supply winding for power supply, the power supply winding converts a voltage for power supply of a first inverter drive module of the first fan and a voltage for power supply of a second inverter drive module of the second fan through a first voltage conversion circuit, the first voltage conversion circuit provides voltage input for a second voltage conversion circuit, the second voltage conversion circuit converts a voltage for power supply of a first control module of the first fan and a voltage for power supply of a second control module of the second fan, therefore, it can be known that the above power supply mode can realize power supply of the control modules and the inverter drive modules of the two fans by using one winding of a transformer, without using two secondary windings or two sets of transformers, thereby saving transformer winding resources and being conducive to layout and wiring design of other circuits of the PCB.

[0029] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by means of the structures particularly pointed out in the description and the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 FIG. 1 is a schematic diagram of module connection of a power supply circuit in an air conditioner outdoor unit provided by an embodiment of the present application;

[0031] Figure 2 FIG. 2 is a schematic diagram of connection of a fan motor and an inverter drive module and a control module provided by an embodiment of the present application;

[0032] Figure 3 FIG. 3 is a schematic diagram of circuit connection of a fan grounding mode provided by an embodiment of the present application;

[0033] Figure 4 FIG. 4 is a whole flowchart of a control method provided by an embodiment of the present application;

[0034] Figure 5 FIG. 5 is a flowchart of separately starting the first fan or the second fan provided by an embodiment of the present application;

[0035] Figure 6 FIG. 6 is a flowchart of starting another fan under the operation of one fan provided by an embodiment of the present application;

[0036] Figure 7 FIG. 7 is a whole flowchart of a control method provided by an example of the present application;

[0037] Figure 8 FIG. 8 is a structural schematic diagram of a controller provided by an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. Meanwhile, the steps or actions in the method description can also be sequentially changed or adjusted in a manner that is apparent to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment, and do not mean that the sequence is necessary, unless otherwise stated that a certain sequence must be followed.

[0039] In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described as first, second, it is only used to distinguish the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0040] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified.

[0041] In the household high-power air conditioning product or light commercial air conditioning product, the capacity of the outdoor unit is large, and generally two fans (double fan) design can be used, and the corresponding double fan motor control circuit and control logic need to be designed.

[0042] Generally, the fan includes a motor for driving the fan blade and an inverter driving chip for driving the motor, and the control of the inverter driving chip is realized by the MCU or other control chip outputting a PWM signal, so that the power supply of the fan is divided into the power supply of the inverter driving chip and the power supply of the control chip, and the working voltages of the two are different, and voltage conversion is required. There are two power supply schemes for the double-fan product commonly used in the related art. One scheme is to use a transformer to set two windings on the secondary side, and the two windings supply power to the control chips and the inverter driving chips of the two fans respectively, so that the power supply of the two parts of the circuit of the two fans is completely isolated, but the disadvantage is that an independent winding needs to be added in the switching power supply, which increases the cost. Another scheme is to use two transformers to set one winding on the secondary side respectively, and the two independent windings supply power to the control chips and the inverter driving chips of the two fans respectively, so that the power supply of the two parts of the circuit of the two fans is completely isolated, but the disadvantage is that the area of the main control board is increased, the electrical control cost is increased, and the production efficiency is reduced.

[0043] Therefore, in the power supply scheme, a single power supply winding is used for power supply, the power supply winding converts a voltage for supplying power to the first inverter driving module of the first fan and a voltage for supplying power to the second inverter driving module of the second fan through the first voltage conversion circuit, the first voltage conversion circuit provides a voltage input for the second voltage conversion circuit, and the second voltage conversion circuit converts a voltage for supplying power to the first control module of the first fan and a voltage for supplying power to the second control module of the second fan. Therefore, it can be known that the above power supply mode can realize the power supply of the control modules and the inverter driving modules of the two fans by using one winding of the transformer, without using two secondary windings or two sets of transformers, saving the winding resources of the transformer, and being beneficial to the layout and wiring design of other circuits of the PCB.

[0044] The air conditioner outdoor unit, the control method, the controller and the outdoor unit will be described below with reference to the drawings.

[0045] Referring to Figure 1 and 2 , as shown, Figure 1 is an air conditioner outdoor unit provided by an embodiment of the present application, Figure 2 is a circuit diagram of a fan motor connected to an inverter driving module and a control module; the air conditioner outdoor unit includes a power supply circuit, a first fan and a second fan, and the power supply circuit includes:

[0046] a first voltage conversion circuit, a voltage input end of the first voltage conversion circuit being connected to a power supply output end of the power supply winding, and a voltage output end of the first voltage conversion circuit being used for supplying power to the first inverter driving module corresponding to the first fan and the second inverter driving module corresponding to the second fan;

[0047] The second voltage conversion circuit is connected with the voltage output end of the first voltage conversion circuit, and a voltage output end of the second voltage conversion circuit is used to supply power to the first control module corresponding to the first fan and the second control module corresponding to the second fan.

[0048] The outdoor unit of the embodiment of the present application adopts double-fan control, that is, it includes a first fan and a second fan, and thus two motors need to be controlled. The positional relationship of the first fan and the second fan is not limited, for example, the first fan and the second fan can be arranged in an up-down manner or in a left-right manner. The switching power supply of the outdoor unit converts the AC input on the primary side into the DC output on the secondary side through a transformer. The embodiment of the present application sets a single secondary side winding to supply power to the inverter drive module and the control module of the two fans. The inverter drive module includes an inverter drive chip (for example, an IPM (Intelligent Power Module) chip), and the control module includes a control chip (for example, an MCU or other controller). The working voltages of the inverter drive chip and the control chip are different, and thus the DC voltage output by the secondary side winding needs to be further converted into two different voltages to supply power to the inverter drive chip and the control chip. In order to avoid using two secondary side windings or two transformers, the embodiment of the present application sets a first voltage conversion circuit and a second voltage conversion circuit. The first voltage conversion circuit is connected with the secondary side winding to convert the voltage required by the inverter drive chip, and the second voltage conversion circuit is connected with the output of the first voltage conversion circuit to convert the voltage required by the control chip according to the voltage output by the first voltage conversion circuit. Therefore, it can be known that the first voltage conversion circuit divides at least two voltage outputs, one of which corresponds to the inverter drive chip / inverter drive module, and the other of which corresponds to the input of the second voltage conversion circuit. The second voltage conversion circuit divides at least two voltage outputs, one of which corresponds to the control chip / control module of the first fan, and the other of which corresponds to the control chip / control module of the second fan. Through the above voltage conversion mode, one secondary side winding can be used to convert two voltages to supply power to the inverter drive module and the control module of the first fan and the second fan, thereby saving the winding resources of the transformer and being conducive to the layout and wiring design of other circuits on the PCB.

[0049] It can be understood that the above-mentioned inverter driving module is a general term of peripheral circuits and components for inverter driving including inverter driving chip, but the voltage converted by the first voltage conversion circuit is mainly supplied to the inverter driving chip, at this time the inverter driving chips corresponding to the first fan and the second fan can select the same type of chip or the chip with the same working voltage, so that the voltage converted by the first voltage conversion circuit can meet the two inverter driving chips at the same time. The above-mentioned control module is a general term of peripheral circuits and components related to control including control chip, but the voltage converted by the second voltage conversion circuit is mainly supplied to the control chip, at this time the control chips corresponding to the first fan and the second fan can select the same type of chip or the chip with the same working voltage, so that the voltage converted by the second voltage conversion circuit can meet the two control chips at the same time. Of course, two conversion modules can be provided in the second voltage conversion circuit to output two voltages to two control chips, at this time the same or different type of control chip can be selected according to the output voltage of the two conversion modules.

[0050] In addition, the working voltage of the inverter driving chip is generally higher than that of the control chip, so the voltage converted by the first voltage conversion circuit is higher than that converted by the second voltage conversion circuit, so the first voltage conversion circuit and the second conversion circuit are both step-down circuits, and the corresponding step-down chip or component can be selected to simply realize step-down conversion.

[0051] In some embodiments, the second voltage conversion circuit includes a first voltage conversion module and a second voltage conversion module, the voltage input end of the first voltage conversion module and the voltage input end of the second voltage conversion module are both connected to the voltage output end of the first voltage conversion circuit, the voltage output end of the first voltage conversion module is used to supply power to the first control module, and the voltage output end of the second voltage conversion module is used to supply power to the second control module.

[0052] In the second voltage conversion circuit of the embodiment, two voltage conversion modules are provided to output voltages to control modules, that is, the voltage input ends of the first voltage conversion module and the second voltage conversion module are both connected to the voltage output end of the first voltage conversion circuit, and the voltages converted by the first voltage conversion circuit are further converted. For example, a voltage conversion chip is used in the first voltage conversion circuit to convert 15V voltage, which is supplied to the first inverter driving module and the second inverter driving module, and another voltage conversion chip is used in the second voltage conversion circuit to convert 5V voltage, which is supplied to the first control module and the second control module. It can be understood that the first voltage conversion module and the second voltage conversion module can not be the same, and can be designed to output different voltages for different control modules.

[0053] Reference Figure 3As shown, the power supply winding secondary side is connected to the ground end (indicated as GND1 in Figure 1 ) of the first fan (indicated as the upper fan in Figure 3 ) and the ground end (indicated as GND2 in Figure 1 ) of the second fan (indicated as the lower fan in Figure 3 ) in a common manner; in addition, one end of the electrolytic capacitor is also connected to the common ground, which is also connected to the power end of the first fan and the ground end of the second fan, thereby realizing the common connection of the power supply winding, the first fan and the second fan and grounding through the electrolytic capacitor on the PCB to stabilize the current in the circuit.

[0054] In some embodiments, the outdoor unit further comprises a first sampling circuit, and the first inverter drive module comprises a first NU pin, a first NV pin and a first NW pin, all of which are connected to the first control module through the first sampling circuit.

[0055] Taking the first inverter drive module as an IPM chip as an example, the IPM chip internally has six power tubes to form three bridge arms, and provides six PMW drive pins, which are connected to six PWM signal output pins of the corresponding control chip / control module. Based on the three bridge arms, three-phase positive end pins and three-phase negative end pins are led out, the three-phase positive end pins are U, V and W three-phase and are connected to the three-phase input of the motor of the first fan, and the three-phase negative end pins are NU, NV and NW three-phase and are grounded. The present application embodiment connects the first sampling circuit at the NU, NV and NW three pins, and collects the ground currents of U, V and W three-phase through the first sampling circuit to determine the current working state of the first fan.

[0056] In some embodiments, the first sampling circuit comprises a first sampling resistor RS1 and a first operational amplifier circuit, and the first NU pin, the first NV pin and the first NW pin are all grounded through the first sampling resistor RS1, the connection point of the first NU pin and the first sampling resistor RS1 is connected to the inverting input terminal of the first operational amplifier circuit, and the non-inverting input terminal of the first operational amplifier circuit is connected to a first reference voltage source.

[0057] The first sampling resistor RS1 is connected in series between the three-phase pins NU, NV and NW and ground, and is single-resistor sampling. The connection point between the first sampling resistor RS1 and the three-phase pins NU, NV and NW is connected to the inverting input terminal of the first operational amplifier circuit through the resistor R1, and the connection point between the first sampling resistor RS1 and the ground is connected to the non-inverting input terminal of the first operational amplifier circuit through the resistor R2. The first reference voltage source is also connected to the non-inverting input terminal of the first operational amplifier circuit. Therefore, the input signal of the first operational amplifier circuit is the voltage difference across the first sampling resistor RS1. This signal is transmitted through a differential wire, which eliminates the common-mode noise of the sampling signal to ground, avoids common-mode interference of the sampling signal, and improves the sampling accuracy and stability.

[0058] The first reference voltage source is connected to the voltage output terminal of the second voltage conversion circuit to output the first reference voltage. Figure 2 As shown in the figure, the voltage output terminal of the second voltage conversion circuit is connected to the non-inverting input terminal of the first operational amplifier circuit through the resistor R6, and the non-inverting input terminal of the first operational amplifier circuit is also connected to the ground through the resistor R5. The voltage reference of the non-inverting input terminal of the first operational amplifier circuit is limited by the voltage division of the resistor R6.

[0059] In some embodiments, the outdoor unit further comprises a second sampling circuit, and the second inverter drive module comprises a second NU pin, a second NV pin and a second NW pin. The second NU pin, the second NV pin and the second NW pin are all connected to the second control module through the second sampling circuit.

[0060] Taking the second inverter drive module as an IPM chip as an example, the IPM chip has six power tubes built-in to form three bridge arms, and provides six PMW drive pins. The six PMW drive pins are connected to the six PWM signal output pins of the corresponding control chip / control module. Based on the three bridge arms, three-phase positive end pins and three-phase negative end pins are led out. The three-phase positive end pins are U, V and W three-phase and are connected to the three-phase input of the motor of the second fan. The three-phase negative end pins are NU, NV and NW three-phase and are grounded. In the present application, the second sampling circuit is connected at the NU, NV and NW pins, and the current of U, V and W three-phase to ground is collected through the second sampling circuit to determine the current working state of the second fan.

[0061] In some embodiments, the second sampling circuit comprises a second sampling resistor RS2 and a second operational amplifier circuit. The second NU pin, the second NV pin and the second NW pin are all grounded through the second sampling resistor RS2. The connection point between the second NU pin and the second sampling resistor RS2 is connected to the non-inverting input terminal of the second operational amplifier circuit. The inverting input terminal of the second operational amplifier circuit is connected to the second reference voltage source.

[0062] The second sampling resistor RS2 is connected in series between the three-phase pins NU, NV and NW and the ground, and is single-resistor sampling. The connection point between the second sampling resistor RS2 and the three-phase pins NU, NV and NW is connected to the inverting input terminal of the first operational amplifier circuit through the resistor R8. The connection point between the second sampling resistor RS2 and the ground is connected to the non-inverting input terminal of the second operational amplifier circuit through the resistor R9. The second reference voltage source is also connected to the non-inverting input terminal of the second operational amplifier circuit. Therefore, the input signal of the second operational amplifier circuit is the voltage difference across the second sampling resistor RS2. This signal is transmitted through a differential line, which eliminates the common-mode noise of the sampling signal to the ground, avoids common-mode interference of the sampling signal, and improves the sampling accuracy and stability.

[0063] The second reference voltage source is connected to the voltage output terminal of the second voltage conversion circuit to output the second reference voltage. Figure 2 As shown in the figure, the voltage output terminal of the second voltage conversion circuit is connected to the non-inverting input terminal of the second operational amplifier circuit through the resistor R13. The non-inverting input terminal of the second operational amplifier circuit is also connected to the ground through the resistor R12. The voltage reference of the non-inverting input terminal of the second operational amplifier circuit is limited by the voltage division of the resistor R13.

[0064] For the outdoor unit with the first fan and the second fan, the power supply scheme of the embodiment of the present application adopts a single power supply winding for power supply. The power supply winding converts a voltage for supplying power to the first inverter drive module of the first fan and a voltage for supplying power to the second inverter drive module of the second fan through the first voltage conversion circuit. The first voltage conversion circuit provides voltage input for the second voltage conversion circuit. The second voltage conversion circuit converts a voltage for supplying power to the first control module of the first fan and a voltage for supplying power to the second control module of the second fan. Therefore, it can be known that the above-mentioned power supply mode can realize power supply for the control modules and the inverter drive modules of the two fans by using one winding of the transformer, without using two secondary side windings or two sets of transformers, thereby saving the winding resources of the transformer and being conducive to the layout and wiring design of other circuits of the PCB.

[0065] In summary, by using a single secondary side winding in combination with the first voltage conversion circuit and the second voltage conversion circuit, matched voltages are provided for the double inverter drive modules and the double control modules of the double fan outdoor unit. This can avoid using two secondary side windings for power supply or using two transformers for power supply. Meanwhile, sampling resistors are also provided for the double fan. The working states of the double fan are obtained through the sampling resistors and the operational amplifier circuit, which can provide more control modes for the control modules.

[0066] The embodiment of the present application also provides a control method applied to the outdoor unit of the air conditioner of any one of the above-mentioned embodiments. Referring to Figure 4 As shown in the figure, the control method includes but is not limited to the following steps:

[0067] Step S110, in response to the start instruction, determining that the fan needs to be turned on;

[0068] Step S120, if it is determined that the first fan and the second fan need to be turned on at the same time, driving the first fan by the first control module at a first carrier frequency and driving the second fan by the second control module at a second carrier frequency, the first carrier frequency and the second carrier frequency being different.

[0069] The outdoor unit starts the double fan, and the power supply circuit of the outdoor unit provides voltage for the inverter drive module and the control module of the double fan. After the inverter drive module and the control module are started, the double fan is controlled to operate according to the set parameters. In order to avoid the problem of resonance interference caused by the control carrier frequency being consistent when the two fans are started at the same time, the first fan is started at a first carrier frequency and the second fan is driven at a second carrier frequency, and the first carrier frequency and the second carrier frequency are different, which can avoid the resonance interference caused by the consistent signal when starting. Specifically, the outdoor unit needs to determine whether the first fan and the second fan are started at the same time, and sends an instruction to the first control module and the second control module, so that the first control module outputs the first carrier frequency through the PWM signal output pin, and the second control module outputs the second carrier frequency through the PWM signal output pin. The difference (absolute value) between the first carrier frequency and the second carrier frequency can be a fixed value, i.e. a preset frequency value.

[0070] Referring to Figure 5 In some embodiments, the control method further comprises:

[0071] Step S210, if it is determined that the first fan needs to be turned on alone, driving the first fan by the first control module at a first carrier frequency;

[0072] Step S220, if it is determined that the second fan needs to be turned on alone, driving the second fan by the second control module at a second carrier frequency.

[0073] If the outdoor unit starts one of the fans alone, the corresponding carrier frequency is set for the fan. If the first fan is turned on alone and the second fan is not turned on, an instruction is sent to the first control module, so that the first control module outputs the first carrier frequency through the PWM signal output pin, and controls the first fan to rotate at the corresponding speed of the first carrier frequency; if the second fan is turned on alone and the first fan is not turned on, an instruction is sent to the second control module, so that the second control module outputs the second carrier frequency through the PWM signal output pin, and controls the second fan to rotate at the corresponding speed of the second carrier frequency.

[0074] Referring to Figure 6As shown, in some embodiments, the control method further comprises:

[0075] Step S310, after starting the first fan alone, in response to the starting instruction of the second fan, the second control module is controlled by the second control module to drive the second fan at the second carrier frequency;

[0076] Or, step S320, after starting the second fan alone, in response to the starting instruction of the first fan, the first control module is controlled by the first control module to drive the first fan at the first carrier frequency.

[0077] If the second fan is started again in the case of the first fan running, in order to avoid resonance interference, an instruction is sent to the second control module, so that the second control module outputs the second carrier frequency through the PWM signal output pin, and controls the second fan to rotate at the corresponding speed of the second carrier frequency. At this time, the first fan corresponds to the first carrier frequency, and the second fan corresponds to the second carrier frequency, so resonance interference can be avoided. If the first fan is started again in the case of the second fan running, in order to avoid resonance interference, an instruction is sent to the first control module, so that the first control module outputs the first carrier frequency through the PWM signal output pin, and controls the first fan to rotate at the corresponding speed of the first carrier frequency. At this time, the first fan corresponds to the first carrier frequency, and the second fan corresponds to the second carrier frequency, so resonance interference can be avoided.

[0078] In summary, the control method of the embodiment of the application can set the carrier frequency of the first fan different from the carrier frequency of the second fan, so as to avoid resonance interference of the first fan and the second fan.

[0079] The power supply circuit and control method of the outdoor unit of the air conditioner of the application will be described in detail below through a specific example.

[0080] The outdoor unit is composed of:

[0081] ① One secondary side winding of the transformer is used for power supply, referring to Figure 1 As shown;

[0082] ② The first fan (indicated as the upper fan in Figure 2 and Figure 3 ) and the second fan (indicated as the lower fan in Figure 2 and Figure 3 ) are arranged in an up-down distribution;

[0083] ③ Two MCU control units, indicated as MCU1 and MCU2 in Figure 2 ;

[0084] ④ Two IPM modules, indicated as IPM1 and IPM2 in Figure 2 ;

[0085] ⑤Two operational amplifier chip modules, in Figure 2 denoted as IC1 and IC2;

[0086] ⑥The fan current uses single-resistance sampling, Figure 2 in which the sampling resistance of the first fan is denoted as RS1, and the sampling resistance of the second fan is denoted as RS2;

[0087] ⑦The first fan and the second fan use motors of the same power, same model, and same parameters; due to the use of double chips, different models and parameters of the fans can also be selected for independent control according to requirements;

[0088] The working principle flowchart of each circuit module is shown in Figure 7 :

[0089] ①The power supply unit is to output a voltage through the winding of the switching transformer, and then output 15V and 5V power supply voltages through the first voltage stabilizing chip (the output voltage is 15V) and the second voltage stabilizing chip (the output voltage is 5V). The 15V is provided for the IPM module, and the 5V is provided for the MCU control unit and the operational amplifier circuit.

[0090] ②The MCU control unit is a basic unit for generating PWM control signals, and can also collect the current signals flowing through the sampling resistors (non-inductive resistors can be selected) through the operational amplifier circuit, and output 6-way PWM control signals after the control algorithm of the MCU control unit.

[0091] ③The operational amplifier provides a reference voltage Vref for the positive input end of the operational amplifier through the voltage division of R13 and R12, in combination with R10, R11, R14, and R15, that is, when the current flowing through the fan is 0, the output voltage of the operational amplifier is Vref.

[0092] ④The input signal of the operational amplifier is the voltage difference across the sampling resistor, which is transmitted through differential wiring to eliminate the common-mode noise of the sampling signal to ground, so that the sampling signal avoids common-mode interference and improves the sampling accuracy and stability.

[0093] ⑤The IPM driving module takes the 6-way PWM control signals as input signals, which can be controlled by MCU instructions to set different carrier frequencies of the 6-way PWM. The PWM output acts on the 6 MOS or IGBT power tubes integrated in the IPM module, so that the output end U, V, and W three-phase winding gets a sinusoidal driving current, and then controls the fan to run. By changing the current frequency and amplitude in the U, V, and W three-phase windings, different speeds of the fan can be obtained.

[0094] Therefore, this example solves the design challenge of mutual interference between fan sampling signals in a dual-fan, dual-chip control system under the premise of power supply by a single power winding; it uses one transformer winding to power the control chips and two modules of the two fans, saving transformer winding resources and facilitating the layout and routing design of other circuits on the PCB; the fan current is sampled using a single resistor, which saves four sampling resistors compared to the three-resistor sampling method for dual fans, reducing the number of resistors and lowering the cost of sampling resistors; the addition of an operational amplifier circuit to use differential signal sampling eliminates common-mode noise to ground in the sampling signal, avoiding common-mode interference in the sampling signal, and sampling according to differential signals greatly reduces the requirements for PCB layout and routing, and the influence of common-mode noise is canceled out by the differential signal lines, improving sampling accuracy and stability.

[0095] like Figure 8 As shown, Figure 8 This is a schematic diagram of a controller 1000 provided in one embodiment of this application.

[0096] The controller 1000 in this embodiment includes one or more processors 1001 and a memory 1002. Figure 8 The example uses a processor 1001 and a memory 1002.

[0097] Processor 1001 and memory 1002 can be connected via a bus or other means. Figure 8 Taking the example of a connection between China and Israel via a bus.

[0098] Memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 1002 may optionally include memory 1002 remotely located relative to processor 1001, and these remote memories can be connected to controller 1000 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0099] Those skilled in the art will understand that Figure 8 The device structure shown does not constitute a limitation on the controller 1000 and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0100] This application also provides an outdoor unit, including the controller 1000 described above.

[0101] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory can optionally include a memory disposed remotely with respect to the processor, which can be connected to the processor through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0102] The non-transitory software programs and instructions required to implement the control method of the air conditioning system of the above-mentioned embodiments are stored in the memory, and when executed by the processor, perform the above-mentioned embodiments.

[0103] The device embodiments described above are merely illustrative, and units described as separate components can or can not be physically separated, i.e., can be located in one place, or can be distributed to multiple network nodes. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0104] Those of ordinary skill in the art can understand that all or some steps in the above disclosed method and system can be implemented as software, firmware, hardware and appropriate combinations thereof. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, as known to those of ordinary skill in the art, communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carriers or other transmission mechanisms, and can include any information delivery medium.

[0105] It should be understood that, in the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases of only A, only B, and A and B existing at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can represent a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0106] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative, for example, the division of units is only a logical functional division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection between some interfaces, devices or units, which can be electrical, mechanical or other forms. The units described as separate components can be or can not be physically separated, and the components displayed as units can be or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. Some or all units can be selected according to actual needs to achieve the purpose of the embodiment.

[0107] It should also be understood that the various embodiments provided by the embodiments of the present application can be combined in any way to achieve different technical effects.

[0108] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An outdoor unit for an air conditioner, characterized in that, The outdoor unit of the air conditioner includes a power supply circuit, a first fan, and a second fan. The power supply circuit includes: The first voltage conversion circuit has its voltage input terminal connected to the power output terminal of the power supply winding, and its voltage output terminal is used to supply power to the first inverter drive module corresponding to the first wind turbine and the second inverter drive module corresponding to the second wind turbine. The second voltage conversion circuit has its voltage input terminal connected to the voltage output terminal of the first voltage conversion circuit, and its voltage output terminal is used to supply power to the first control module corresponding to the first fan and the second control module corresponding to the second fan.

2. The outdoor unit of the air conditioner according to claim 1, characterized in that, The second voltage conversion circuit includes a first voltage conversion module and a second voltage conversion module. The voltage input terminal of the first voltage conversion module and the voltage input terminal of the second voltage conversion module are both connected to the voltage output terminal of the first voltage conversion circuit. The voltage output terminal of the first voltage conversion module is used to supply power to the first control module, and the voltage output terminal of the second voltage conversion module is used to supply power to the second control module.

3. The outdoor unit of the air conditioner according to claim 1, characterized in that, The outdoor unit also includes a first sampling circuit. The first inverter drive module includes a first NU pin, a first NV pin, and a first NW pin. The first NU pin, the first NV pin, and the first NW pin are all connected to the first control module through the first sampling circuit.

4. The outdoor unit of the air conditioner according to claim 3, characterized in that, The first sampling circuit includes a first sampling resistor and a first operational amplifier circuit. The first NU pin, the first NV pin, and the first NW pin are all grounded through the first sampling resistor. The connection point between the first NU pin and the first sampling resistor is connected to the inverting input terminal of the first operational amplifier circuit. The non-inverting input terminal of the first operational amplifier circuit is connected to a first reference voltage source.

5. The outdoor unit of the air conditioner according to claim 4, characterized in that, The first reference voltage source is connected to the voltage output terminal of the second voltage conversion circuit to output the first reference voltage.

6. The outdoor unit of the air conditioner according to claim 1, characterized in that, The outdoor unit also includes a second sampling circuit. The second inverter drive module includes a second NU pin, a second NV pin, and a second NW pin. The second NU pin, the second NV pin, and the second NW pin are all connected to the second control module through the second sampling circuit.

7. The outdoor unit of the air conditioner according to claim 6, characterized in that, The second sampling circuit includes a second sampling resistor and a second operational amplifier circuit. The second NU pin, the second NV pin, and the second NW pin are all grounded through the second sampling resistor. The connection point between the second NU pin and the second sampling resistor is connected to the non-inverting input terminal of the second operational amplifier circuit, and the inverting input terminal of the second operational amplifier circuit is connected to a second reference voltage source.

8. The outdoor unit of the air conditioner according to claim 7, characterized in that, The second reference voltage source is connected to the voltage output terminal of the second voltage conversion circuit to output the second reference voltage.

9. The outdoor unit of the air conditioner according to claim 1, characterized in that, The first fan is positioned above the second fan.

10. A control method, characterized in that, The control method, applied to an outdoor air conditioning unit as described in any one of claims 1 to 9, comprises: In response to the start command, determine which fan needs to be turned on; If it is determined that the first fan and the second fan need to be turned on at the same time, the first control module controls the first inverter drive module to drive the first fan at the first carrier frequency, and the second control module controls the second inverter drive module to drive the second fan at the second carrier frequency. The first carrier frequency and the second carrier frequency are different.

11. The control method according to claim 10, characterized in that, The control method further includes: If it is determined that the first wind turbine needs to be turned on separately, the first control module controls the first inverter drive module to drive the first wind turbine at the first carrier frequency. If it is determined that the second fan needs to be turned on separately, the second control module controls the second inverter drive module to drive the second fan at the second carrier frequency.

12. The control method according to claim 10, characterized in that, The control method further includes: After the first fan is turned on independently, in response to the start command of the second fan, the second control module controls the second inverter drive module to drive the second fan at the second carrier frequency. Alternatively, after the second fan is started independently, in response to the start command of the first fan, the first control module controls the first inverter drive module to drive the first fan at the first carrier frequency.

13. The control method according to any one of claims 10 to 12, characterized in that, The frequency difference between the first carrier frequency and the second carrier frequency is a preset frequency value.

14. A controller, characterized in that, It includes at least one processor and a memory for communicatively connecting to the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the control method as described in any one of claims 10 to 13.

15. An outdoor unit, characterized in that, Includes the controller as described in claim 14.

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