Control circuit of air conditioner fan, control method of air conditioner and air conditioner

Abstract

The invention particularly provides a control circuit of an air conditioner fan, a control method of an air conditioner and the air conditioner. The control circuit comprises a consumption circuit and a detection circuit, the consumption circuit comprises two driving modules and a direct-current capacitor, the output end of the first driving module is connected with the input end of the fan, and the output end of the second driving module is connected with the input end of the compressor. The input ends of the first driving module and the second driving module are connected with the direct current capacitor in parallel; two ends of the direct-current capacitor are respectively connected with the direct-current bus power supply; the detection circuit is connected to the two ends of the direct-current capacitor in parallel, and the output end of the detection circuit is connected with a VDC detection pin of the single-chip microcomputer, so that the single-chip microcomputer selectively controls the compressor not to operate based on the voltage, detected by the detection circuit, of the direct-current capacitor, and electric energy stored in the direct-current capacitor is converted into heat energy of the compressor. Therefore, kinetic energy of rotation of the fan is converted into heat energy of the compressor to be consumed, rotation of the compressor is not needed, and the control mode is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning control, and specifically provides a control circuit of an air conditioning fan, a control method of an air conditioning, and an air conditioning. Background Art

[0002] In air-conditioning applications, the fan of the outdoor unit is in a natural environment. Due to the blowing of natural wind, the fan may not be in a static state before starting. When the fan speed is high, the fan works in a generator state, and the DC bus will be reversely charged. The voltage of the DC bus will increase. The capacitance of the DC bus is generally small. When the voltage is increased, it is easy to exceed the tolerance range of the device and cause damage to the device.

[0003] The existing solution is generally to add a brake circuit, but this method requires the introduction of additional topology and algorithms, which increases control requirements and equipment costs;

[0004] Accordingly, the art requires a new air conditioning control solution to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention is proposed to provide a control circuit for an air-conditioning fan, a control method for an air-conditioning, and an air-conditioning that solve or at least partially solve the technical problems in the prior art of adding a brake circuit that causes a complicated control method and increased equipment cost.

[0006] In a first aspect, the present invention provides a control circuit for an air-conditioning fan, wherein the air-conditioning further comprises a compressor and a single-chip microcomputer MCU, wherein the single-chip microcomputer MCU is respectively connected to the compressor and the fan; the control circuit comprises a consumption circuit and a detection circuit, wherein the consumption circuit comprises a first driving module, a second driving module and a DC capacitor E1, wherein the output end of the first driving module is connected to the input end of the fan, the output end of the second driving module is connected to the input end of the compressor, and the input end of the first driving module and the input end of the second driving module are both connected in parallel to the DC capacitor E1; the two ends of the DC capacitor E1 are also respectively connected to a DC bus power supply; the detection circuit is connected in parallel to the two ends of the DC capacitor E1, and the output end of the detection circuit is connected to the VDC detection pin of the single-chip microcomputer MCU, so that the single-chip microcomputer MCU selectively controls the compressor not to operate based on the voltage of the DC capacitor E1 detected by the detection circuit.

[0007] In a technical solution of the control circuit of the above-mentioned air-conditioning fan, the detection circuit includes a voltage divider module, a filter module and a protection module. The input end of the voltage divider module is connected to the positive pole P+ of the DC bus power supply, the output end of the voltage divider module is connected to the input end of the filter module, the first output end of the filter module is connected to the output end of the protection module, the second output end of the filter module is connected to the ground end of the protection module, the input end of the protection module is connected to the second input power supply, and the output end of the protection module is also connected to the VDC detection pin of the single-chip computer MCU.

[0008] In a technical solution of the control circuit of the above-mentioned air-conditioning fan, the voltage divider module includes a first resistance unit and a second resistance unit connected in series, the first resistance unit includes one resistor or multiple series resistors, and the second resistance unit includes one resistor or multiple series resistors; wherein, the input end of the first resistance unit is connected to the positive electrode P+ of the bus DC power supply, one end of the second resistance unit is connected to the negative electrode N- of the DC bus power supply, and the connection end of the first resistance unit and the second resistance unit is connected to the input end of the filter module.

[0009] In a technical solution of the control circuit of the above-mentioned air-conditioning fan, the filter module includes a filter resistor and a filter capacitor, the input end of the filter resistor is connected to the connection end of the first resistance unit and the second resistance unit, the output end of the filter resistor is connected to the output end of the protection module and one end of the filter capacitor, and the other end of the filter capacitor is connected to the ground end of the protection module.

[0010] In a technical solution of the control circuit of the above-mentioned air-conditioning fan, the protection module includes a switching diode unit, and the switching diode unit has three pin ends, wherein the first pin end is connected to the second input power supply, the second pin end of the switching diode unit is connected to the other end of the filter capacitor and grounded, and the third pin end of the switching diode unit is connected to the VDC detection pin of the single-chip microcomputer MCU.

[0011] In a technical solution of the control circuit of the above-mentioned air-conditioning fan, the first driving module and the second driving module each include a three-phase power inverter, and each of the three-phase power inverters includes at least six power switching elements.

[0012] In a technical solution of the control circuit of the above-mentioned air-conditioning fan, each of the three-phase power meter inverters includes three parallel bridge arms that output U phase, V phase and W phase respectively, wherein each bridge arm includes an upper bridge arm, a lower bridge arm and a current detection resistor connected in series; each upper bridge arm and lower bridge arm include a power switching element and a diode connected in parallel, wherein the collector of the power switching element of each upper bridge arm is connected to the negative electrode of the corresponding diode and the positive electrode P+ of the bus DC power supply, the emitter of the power switching element is connected to the positive electrode of the diode and the collector of the power switching element of the corresponding lower bridge arm, and the negative electrode of the diode corresponding to the lower bridge arm, the emitter of the power switching element of the lower bridge arm is connected to the positive electrode of the corresponding diode, the current detection pin of the corresponding single-chip microcomputer MCU and one end of the current detection resistor, and the other end of the current detection resistor is connected to the negative electrode N- of the DC bus power supply; the connection end of the upper bridge arm and the lower bridge arm in each bridge arm is used as an output end, and the output end is respectively connected to the input end of the fan or the input end of the compressor.

[0013] In a technical solution of the control circuit of the above-mentioned air-conditioning fan, the control circuit also includes a temperature sensing module, the temperature sensing module includes at least one temperature sensing unit, the input end of the temperature sensing unit is connected to the second input power supply, and the output end of the temperature sensing unit is connected to the temperature detection pin of the single-chip microcomputer MCU, wherein the temperature sensing unit is arranged on one side of the first driving module and the second driving module to enable the single-chip microcomputer MCU to detect the temperature of the two driving modules.

[0014] In a second aspect, the present invention provides a control method for an air conditioner, which is applied to a control circuit of an air conditioner fan as described in any one of the above items, and the method comprises the following steps: a single chip microcomputer obtains the voltage of a DC capacitor E1 through a detection circuit and determines whether the fan rotates abnormally based on the voltage: if so, the single chip microcomputer controls a second drive module to drive the compressor to start with a preset duty cycle PWM, and the preset duty cycle is set so that the direction of the magnetic pole generated by the current in the stator of the compressor is the same as the direction of the rotor of the compressor, or the steering torque generated between the magnetic pole generated by the current in the stator of the compressor and the magnetic field of the rotor of the compressor is lower than the starting torque for rotating the rotor of the compressor, so as to achieve that the compressor does not run during the process of consuming the electric energy stored in the DC capacitor E1; wherein the electric energy stored in the DC capacitor E1 is the electric energy that the fan converts wind energy into DC power through the first drive module and inputs into the DC capacitor E1 when the fan rotates.

[0015] In a third aspect, an air conditioner is provided, comprising a fan, a compressor, a control circuit for the air conditioner fan as described in any one of the technical solutions of the control circuit for the air conditioner fan, and a single chip microcomputer.

[0016] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects: by setting a consumption circuit and a detection circuit, the consumption circuit includes a first drive module connected to the fan, a second drive module connected to the compressor and a DC capacitor E1 connected in parallel with the two, the compressor, the fan and the detection circuit are all connected to the single-chip microcomputer, and the detection circuit is also connected in parallel with the DC capacitor E1. Based on the set consumption circuit and detection circuit, when the fan rotates, the fan converts wind energy into DC power and transmits it to the DC capacitor E1, and when the fan rotates abnormally, the single-chip microcomputer detects the abnormal increase in the voltage of the DC capacitor E1 through the detection circuit, thereby realizing the single-chip microcomputer to detect the voltage of the DC capacitor E1 through the detection circuit, and the single-chip microcomputer selectively controls the compressor not to operate according to the voltage detection result, thereby realizing the conversion of the electric energy stored in the DC capacitor E1 into the heat energy of the compressor, and then realizing the conversion of the rotational kinetic energy of the fan into the heat energy of the compressor for consumption, without the need for the compressor to rotate, and the control method is simple, avoiding the problem of complex control method and increased equipment cost caused by adding a brake circuit in the prior art.

[0017] In the technical solution for implementing the present invention, a second drive module connected to a compressor is provided, the compressor, the fan and the detection circuit are all connected to the single-chip microcomputer, and the detection circuit, the first drive module and the second drive module are all connected in parallel with the DC capacitor E1, so that when the single-chip microcomputer detects the voltage of the DC capacitor E1 through the detection circuit and determines that the fan is in abnormal rotation, the single-chip microcomputer controls the second drive module to drive the compressor to achieve PWM start with a preset duty cycle, so that the electrical energy of the DC capacitor E1 is converted into heat energy of the compressor for consumption, thereby realizing the consumption of the kinetic energy of the fan without the need for additional components, thereby saving equipment costs.

[0018] In the technical solution of the present invention, the detection circuit is connected in parallel with the DC capacitor E1 and connected to the single-chip microcomputer, so that the voltage of the DC capacitor E1 can be detected while protecting the single-chip microcomputer, thereby improving the detection safety and avoiding damage to the air conditioner caused by the voltage increase of the DC capacitor E1. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

[0020] Figure 1 is a schematic diagram of a consumption circuit of a control circuit of an air conditioner fan according to an embodiment of the present invention;

[0021] Figure 2is a schematic diagram of the principle of a detection circuit of a control circuit of an air conditioner fan according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the principle of a single chip microcomputer of a control circuit of an air conditioner fan according to an embodiment of the present invention;

[0023] Figure 4 is a flow chart of main steps of a method for controlling an air conditioner according to an embodiment of the present invention;

[0024] Figure 5 1 is a main structural block diagram of an air conditioner according to an embodiment of the present invention.

[0025] Reference numerals list :

[0026] 500: Air conditioning. DETAILED DESCRIPTION

[0027] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0028] In the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memories, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program codes, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and the like. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B", and may include only A, only B, or A and B. The singular terms "one" and "the" may also include plural forms.

[0029] The directional terms used in this article, such as "upper", "upper side", "lower", "lower side", "left", "left side", "right" and "right side", are all based on the up, down, left and right directions of the components on the circuit board after the components are installed on the circuit board.

[0030] See attached Figure 1 , Figure 1FIG. 1 is a schematic diagram of a consumption circuit of a control circuit of an air conditioner fan according to an embodiment of the present invention. Figure 1 As shown, the air conditioner also includes a compressor CN18 and a single-chip microcomputer MCU, and the single-chip microcomputer MCU is connected to the compressor CN18 and the fan CN19 respectively. The control circuit of the air-conditioning fan in the embodiment of the present invention includes a consumption circuit and a detection circuit. The consumption circuit in the control circuit of the air-conditioning fan in the embodiment of the present invention includes a first driving module, a second driving module and a DC capacitor E1. The output end of the first driving module is connected to the input end of the fan CN19, and the output end of the second driving module is connected to the input end of the compressor CN18. The input end of the first driving module and the input end of the second driving module are both connected in parallel with the DC capacitor E1; the two ends of the DC capacitor E1 are also connected to the DC bus power supply respectively; the detection circuit is connected in parallel to the two ends of the DC capacitor E1, and the output end of the detection circuit is connected to the VDC detection pin of the single-chip microcomputer MCU, so that the single-chip microcomputer MCU selectively controls the compressor not to operate based on the voltage of the DC capacitor E1 detected by the detection circuit.

[0031] Specifically, in some embodiments, the first driving module and the second driving module each include a three-phase power inverter, and each of the three-phase power inverters includes at least six power switch elements.

[0032] Specifically, in some embodiments, each of the three-phase power meter inverters includes three parallel bridge arms that output U phase, V phase and W phase respectively, wherein each bridge arm includes an upper bridge arm, a lower bridge arm and a current detection resistor connected in series; each upper bridge arm and lower bridge arm include a power switching element and a diode connected in parallel, wherein the collector of the power switching element of each upper bridge arm is connected to the negative electrode of the corresponding diode and the positive electrode P+ of the bus DC power supply, the emitter of the power switching element is connected to the positive electrode of the diode and the collector of the power switching element of the corresponding lower bridge arm, and the negative electrode of the diode corresponding to the lower bridge arm, the emitter of the power switching element of the lower bridge arm is connected to the positive electrode of the corresponding diode, the current detection pin of the corresponding single-chip microcomputer MCU and one end of the current detection resistor, the other end of the current detection resistor is connected to the negative electrode N- of the DC bus power supply, and the base of the power switching element is connected to the control pin of the corresponding single-chip microcomputer MCU; the connection end of the upper bridge arm and the lower bridge arm in each bridge arm is used as the output end, and the output end is respectively connected to the input end of the fan or the input end of the compressor.

[0033] Specifically, in some embodiments, the three-phase power meter inverter of the first drive module outputs the three-phase voltage of U phase, V phase and W phase to act on the fan CN19, and the three-phase power meter inverter of the second drive module outputs the three-phase voltage of U phase, V phase and W phase to act on the compressor CN18.

[0034] Specifically, in some embodiments, the control circuit also includes a temperature sensing module, the temperature sensing module includes at least one temperature sensing unit, the input end of the temperature sensing unit is connected to a second input power supply, and the output end of the temperature sensing unit is connected to a temperature detection pin of the microcontroller MCU, wherein the temperature sensing unit is arranged on one side of the first driving module and the second driving module to enable the microcontroller MCU to detect the temperature of the two driving modules.

[0035] Specifically, in some embodiments, the second input power supply may be a +5V DC power supply. The setting of the second input power supply here is only an exemplary description. In actual testing, those skilled in the art may set it according to actual needs, which will not be repeated here.

[0036] Specifically, in some embodiments, the number of the temperature sensing units is two, and the temperature sensing units are thermistors, wherein the first temperature sensing unit is arranged on one side of the first driving module or in the middle of any two components in the first driving module, and the second temperature sensing unit is arranged on one side of the second driving module or in the middle of any two components in the second driving module, the input ends of the first temperature sensing unit and the second temperature sensing unit are both connected to the second input power supply, the output end of the first temperature sensing unit is connected to the first temperature detection pin FAN1-RT of the microcontroller MCU, and the output end of the second temperature sensing unit is connected to the second temperature detection pin FAN2-RT of the microcontroller MCU, so that the microcontroller MCU can detect the temperature of the two driving modules. The setting of the number of temperature sensing units and the selection of temperature sensing units here are only exemplary descriptions. In actual tests, those skilled in the art can make settings according to actual needs, as long as the microcontroller MCU can detect the temperature of the two driving modules through the temperature sensing module, and no further details will be given here.

[0037] In the above embodiment, by setting a consumption circuit and a detection circuit, the consumption circuit includes a first drive module connected to the fan, a second drive module connected to the compressor, and a DC capacitor E1 connected in parallel with the two. The compressor, the fan and the detection circuit are all connected to the single-chip microcomputer, and the detection circuit is also connected in parallel with the DC capacitor E1. Based on the set consumption circuit and detection circuit, when the fan rotates, the fan converts wind energy into DC power and transmits it to the DC capacitor E1. When the fan rotates abnormally, the single-chip microcomputer detects the abnormal increase in the voltage of the DC capacitor E1 through the detection circuit, thereby realizing the single-chip microcomputer to detect the voltage of the DC capacitor E1 through the detection circuit, and the single-chip microcomputer selectively controls the compressor not to operate according to the voltage detection result, thereby realizing the conversion of the electric energy stored in the DC capacitor E1 into the heat energy of the compressor, and then realizing the conversion of the rotational kinetic energy of the fan into the heat energy of the compressor for consumption. There is no need for the compressor to rotate, and the control method is simple, avoiding the problem of complex control method and increased equipment cost caused by adding a brake circuit in the prior art.

[0038] See attached Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a detection circuit of a control circuit of an air conditioner fan according to an embodiment of the present invention. Figure 2 As shown, the detection circuit in the control circuit of the air-conditioning fan in the embodiment of the present invention includes a voltage divider module, a filter module and a protection module, the input end of the voltage divider module is connected to the positive pole P+ of the DC bus power supply, the output end of the voltage divider module is connected to the input end of the filter module, the first output end of the filter module is connected to the output end of the protection module, the second output end of the filter module is connected to the ground end of the protection module, the input end of the protection module is connected to the second input power supply, and the output end of the protection module is also connected to the VDC detection pin of the single-chip computer MCU.

[0039] Specifically, in some embodiments, the voltage divider module is connected in parallel with the DC capacitor E1, and the voltage divider module includes a first resistance unit and a second resistance unit connected in series, the first resistance unit includes one resistor or multiple series resistors, and the second resistance unit includes one resistor or multiple series resistors; wherein, the input end of the first resistance unit is connected to the positive pole P+ of the bus DC power supply, one end of the second resistance unit is connected to the negative pole N- of the DC bus power supply, and the connection end of the first resistance unit and the second resistance unit is connected to the input end of the filter module.

[0040] Specifically, in some embodiments, the first resistance unit may include four resistors connected in series, and the second resistance unit may include one resistor. The setting of the number of resistors in the first resistance unit and the second resistance unit is only an exemplary description. In actual testing, those skilled in the art can set it according to actual needs, as long as the voltage of the DC capacitor E1 can be reduced to within the detection range of the single-chip microcomputer MCU, which will not be repeated here.

[0041] Specifically, in some embodiments, the filtering module includes a filtering resistor R215 and a filtering capacitor C70, the input end of the filtering resistor R215 is connected to the connection end of the first resistance unit and the second resistance unit, the output end of the filtering resistor R215 is connected to the output end of the protection module and one end of the filtering capacitor C70, and the other end of the filtering capacitor C70 is connected to the ground end of the protection module.

[0042] Specifically, in some embodiments, the protection module includes a switching diode unit D47, the switching diode unit D47 has three pins, wherein the first pin end is connected to the second input power supply, the second pin end of the switching diode unit D47 is connected to the other end of the filter capacitor C70 and grounded, and the third pin end of the switching diode unit D47 is connected to the VDC detection pin of the microcontroller MCU.

[0043] Specifically, in some embodiments, the switch diode unit may be a bipolar diode, wherein, as shown in the attached Figure 2 The BAV99 bipolar diode is used as an example. The selection of the switching diode unit here is only an exemplary description. In actual testing, those skilled in the art can make a selection according to actual needs, which will not be repeated here.

[0044] In the above embodiment, by connecting the detection circuit in parallel with the DC capacitor E1 and the single-chip microcomputer, the voltage of the DC capacitor E1 can be detected while protecting the single-chip microcomputer, thereby improving the detection safety and avoiding damage to the air conditioner caused by the increase in the voltage of the DC capacitor E1.

[0045] Furthermore, in some embodiments, when the ambient wind drives the fan blades to rotate, the kinetic energy generated by the rotation of the fan is converted into direct current through the first drive module, and the direct current is input into the DC capacitor E1, so that the voltage in the DC capacitor E1 increases. When the single-chip microcomputer MCU detects through the detection circuit that the voltage value of the VDC detection pin of the single-chip microcomputer MCU exceeds the preset threshold value, it is determined that the voltage in the DC capacitor E1 increases abnormally, thereby determining that the fan is rotating abnormally. At this time, the single-chip microcomputer MCU controls the second drive module to execute a PWM start with a preset duty cycle, so that the direction of the magnetic pole generated by the current in the stator of the compressor is the same as the direction of the rotor of the compressor, or the steering torque generated between the magnetic pole generated by the current in the stator of the compressor and the magnetic field of the rotor of the compressor is lower than the starting torque that rotates the rotor of the compressor, thereby realizing that the compressor does not run during the process of consuming the electric energy stored in the DC capacitor E1, thereby realizing the consumption of the electric energy stored in the DC capacitor E1 through the heat energy of the compressor.

[0046] See attached Figure 3 , Figure 3 FIG. 1 is a schematic diagram of a single chip microcomputer of a control circuit of an air conditioner fan according to an embodiment of the present invention. Figure 3As shown, the single-chip microcomputer MCU includes a VDC detection pin, a current detection pin, a temperature detection pin, a control pin and a drive module control pin. The VDC detection pin of the single-chip microcomputer MCU is connected to the output end of the switching diode unit D47 and the output end of the filter resistor R215, so that the single-chip microcomputer MCU detects the voltage of the DC capacitor E1 through the detection circuit; the current detection pins IU1, IV1, IW1, IU2, IV2 and IW2 of the single-chip microcomputer MCU are respectively connected to one end of the corresponding current detection resistor, so that the single-chip microcomputer MCU detects the current on the three-phase circuit of the U phase, V phase and W phase output by each of the three-phase power meter inverters; the temperature detection pin of the single-chip microcomputer MCU includes a first temperature detection pin FAN1-RT and a second temperature detection pin FAN2-RT. The first temperature detection pin FAN1-RT of the single-chip microcomputer MCU is connected to the output end of the first temperature sensing unit, and the second temperature detection pin FAN 2-RT is connected to the output end of the second temperature sensing unit to enable the single-chip microcomputer MCU to detect the temperature of the two drive modules; the control pins FAN1-GUG1, FAN1-GUG2, FAN1-GUG3, FAN1-GUG4, FAN1-GUG5, FAN1-GUG6, FAN2-GUG1, FAN2-GUG2, FAN2-GUG3, FAN2-GUG4, FAN2-GUG5 and FAN2-GUG6 of the single-chip microcomputer MCU are respectively connected to the base of the corresponding power switching element to enable the single-chip microcomputer MCU to control each power switching element; the second drive module control pins U1, V1, and W1 of the single-chip microcomputer MCU are respectively connected to the output end of the three-phase circuit of the second drive module to enable the single-chip microcomputer MCU to control the compressor; the first drive module control pins U2, V2 and W2 of the single-chip microcomputer MCU are respectively connected to the output end of the three-phase circuit of the first drive module to enable the single-chip microcomputer MCU to control the fan.

[0047] See attached Figure 4 , Figure 4 FIG. 1 is a flow chart showing the main steps of a method for controlling an air conditioner according to an embodiment of the present invention. Figure 4 As shown, the method is applied to the control circuit of the air conditioner fan described in any one of the above items. The air conditioner control method in the embodiment of the present invention mainly includes the following steps S401-S402.

[0048] Step S401: The single chip microcomputer obtains the voltage of the DC capacitor E1 through the detection circuit and determines whether the fan rotates abnormally based on the voltage:

[0049] Specifically, in some embodiments, judging whether the fan rotates abnormally based on the voltage includes: if the voltage is greater than or equal to a preset threshold, judging that the fan rotates abnormally; otherwise, judging that the fan does not rotate abnormally.

[0050] Specifically, in some embodiments, the preset threshold may be 3.5V. The setting of the preset threshold here is only an exemplary description. In actual testing, those skilled in the art may set it according to actual needs, and it will not be repeated here.

[0051] Step S402: If yes, the single-chip microcomputer controls the second driving module to drive the compressor to start with a preset duty cycle PWM, and the preset duty cycle is set so that the direction of the magnetic pole generated by the current in the stator of the compressor is the same as the direction of the rotor of the compressor, or the steering torque generated between the magnetic pole generated by the current in the stator of the compressor and the magnetic field of the rotor of the compressor is lower than the starting torque for rotating the rotor of the compressor, so as to achieve that the compressor does not run during the process of consuming the electric energy stored in the DC capacitor E1; wherein the electric energy stored in the DC capacitor E1 is the electric energy that the fan converts wind energy into DC power through the first driving module and inputs into the DC capacitor E1 when the fan rotates.

[0052] In the above embodiment, by providing a second drive module connected to the compressor, the compressor, the fan and the detection circuit are all connected to the single-chip microcomputer, and the detection circuit, the first drive module and the second drive module are all connected in parallel with the DC capacitor E1, so that when the single-chip microcomputer detects the voltage of the DC capacitor E1 through the detection circuit and determines that the fan is in abnormal rotation, the single-chip microcomputer controls the second drive module to drive the compressor to achieve PWM start with a preset duty cycle, so that the electrical energy of the DC capacitor E1 is converted into heat energy of the compressor for consumption, thereby realizing the consumption of the kinetic energy of the fan without the need for additional components, thereby saving equipment costs.

[0053] Furthermore, in some embodiments, the method also includes: the single-chip microcomputer detects the temperature of the two driving modules through a temperature sensing unit; specifically, in some embodiments, the resistance value of the temperature sensing unit is obtained through the temperature detection pin of the single-chip microcomputer MCU, and then the single-chip microcomputer MCU obtains the temperature of the first driving module and / or the second driving module to realize the detection of the temperature of the two driving modules.

[0054] Based on the above steps S401-S402, the single chip microcomputer detects the voltage of the DC capacitor E1 through the detection circuit, and determines whether the fan rotates abnormally according to the voltage. When it is determined that the fan rotates abnormally, the compressor is controlled not to run, so that the compressor consumes the electric energy stored in the DC capacitor E1. The control method is simple, and the problem of complicated control method and increased equipment cost caused by adding a brake circuit in the prior art is avoided.

[0055] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0056] Furthermore, the present invention also provides an air conditioner.

[0057] See attached Figure 5 , Figure 5 1 is a main structural block diagram of an air conditioner according to an embodiment of the present invention. Figure 5 As shown, the air conditioner 500 in the embodiment of the present invention mainly includes a fan, a compressor, a control circuit of the air conditioner fan described in any of the above embodiments, and a single chip microcomputer. Specifically, in some embodiments, the single chip microcomputer MCU is connected to the compressor and the fan respectively, the control circuit includes a consumption circuit and a detection circuit, the consumption circuit includes a first drive module, a second drive module and a DC capacitor E1, the output end of the first drive module is connected to the input end of the fan, the output end of the second drive module is connected to the input end of the compressor, the input end of the first drive module and the input end of the second drive module, and the detection circuit are all connected in parallel with the DC capacitor E1, and the output end of the detection circuit is connected to the VDC detection pin of the single chip microcomputer MCU; the kinetic energy generated by the rotation of the fan is converted into direct current through the first drive module in the consumption circuit, and the direct current is input to the DC bus capacitor E1 in the consumption circuit, so that the current of the DC bus capacitor E1 The voltage rises, and at the same time, the single-chip microcomputer MCU detects the voltage of the DC bus capacitor E1 through the detection circuit. When the detected voltage exceeds the preset threshold, the single-chip microcomputer MCU determines that the voltage in the DC capacitor E1 rises abnormally, thereby determining that the fan rotates abnormally, and the single-chip microcomputer MCU controls the compressor to execute a PWM start with a preset duty cycle through the second drive module in the consumption circuit, so that the direction of the magnetic pole generated by the current in the stator of the compressor is the same as the direction of the rotor of the compressor, or the steering torque generated between the magnetic pole generated by the current in the stator of the compressor and the magnetic field of the rotor of the compressor is lower than the starting torque that rotates the rotor of the compressor, thereby realizing that the compressor does not operate during the process of consuming the electric energy stored in the DC capacitor E1, and the electric energy stored in the DC capacitor E1 is consumed by the heat energy of the compressor. Specifically, in some embodiments, the description of the specific implementation function can be referred to the description of steps S401-step S402.

[0058] The air conditioner 500 is used to perform Figure 4The control method embodiment of the air conditioner shown in the figure has similar technical principles, technical problems solved and technical effects produced. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process and related instructions of the air conditioner 500 can refer to the contents described in the control method embodiment of the air conditioner, and will not be repeated here. For the convenience of description, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention.

[0059] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A control circuit for an air conditioner fan, characterized in that: The air conditioner further includes a compressor and a single-chip microcomputer MCU, and the single-chip microcomputer MCU is connected to the compressor and the fan respectively; the control circuit includes a consumption circuit and a detection circuit, and the consumption circuit includes a first driving module, a second driving module and a DC capacitor E1, the output end of the first driving module is connected to the input end of the fan, the output end of the second driving module is connected to the input end of the compressor, and the input end of the first driving module and the input end of the second driving module are both connected in parallel with the DC capacitor E1; the two ends of the DC capacitor E1 are also respectively connected to the DC bus power supply; The detection circuit is connected in parallel to both ends of the DC capacitor E1, and the output end of the detection circuit is connected to the VDC detection pin of the single-chip microcomputer MCU, so that the single-chip microcomputer MCU selectively controls the compressor to stop running based on the voltage of the DC capacitor E1 detected by the detection circuit.

2. The control circuit of the air conditioner fan according to claim 1, characterized in that: The detection circuit includes a voltage divider module, a filter module and a protection module. The input end of the voltage divider module is connected to the positive electrode P+ of the DC bus power supply, the output end of the voltage divider module is connected to the input end of the filter module, the first output end of the filter module is connected to the output end of the protection module, the second output end of the filter module is connected to the ground end of the protection module, the input end of the protection module is connected to the second input power supply, and the output end of the protection module is also connected to the VDC detection pin of the single-chip computer MCU.

3. The control circuit of the air conditioner fan according to claim 2, characterized in that: The voltage divider module includes a first resistance unit and a second resistance unit connected in series, the first resistance unit includes one resistor or multiple series resistors, and the second resistance unit includes one resistor or multiple series resistors; wherein, the input end of the first resistance unit is connected to the positive electrode P+ of the bus DC power supply, one end of the second resistance unit is connected to the negative electrode N- of the DC bus power supply, and the connection end of the first resistance unit and the second resistance unit is connected to the input end of the filter module.

4. The control circuit of the air conditioner fan according to claim 3, characterized in that: The filter module includes a filter resistor and a filter capacitor, the input end of the filter resistor is connected to the connection end of the first resistance unit and the second resistance unit, the output end of the filter resistor is connected to the output end of the protection module and one end of the filter capacitor, and the other end of the filter capacitor is connected to the ground end of the protection module.

5. The control circuit of the air conditioner fan according to claim 4, characterized in that: The protection module includes a switching diode unit, which has three pin ends, wherein the first pin end is connected to the second input power supply, the second pin end of the switching diode unit is connected to the other end of the filter capacitor and grounded, and the third pin end of the switching diode unit is connected to the VDC detection pin of the single-chip microcomputer MCU.

6. The control circuit of the air conditioner fan according to any one of claims 1 to 5, characterized in that: The first driving module and the second driving module each include a three-phase power inverter, and each of the three-phase power inverters includes at least six power switch elements.

7. The control circuit of the air conditioner fan according to claim 6, characterized in that: Each of the three-phase power meter inverters includes three parallel bridge arms that output U phase, V phase and W phase respectively, wherein each bridge arm includes an upper bridge arm, a lower bridge arm and a current detection resistor connected in series; each upper bridge arm and lower bridge arm include a power switch element and a diode connected in parallel, wherein the collector of the power switch element of each upper bridge arm is connected to the negative electrode of the corresponding diode and the positive electrode P+ of the bus DC power supply, the emitter of the power switch element is connected to the positive electrode of the diode and the collector of the power switch element of the corresponding lower bridge arm and the negative electrode of the diode corresponding to the lower bridge arm, the emitter of the power switch element of the lower bridge arm is connected to the positive electrode of the corresponding diode, the current detection pin of the corresponding single-chip microcomputer MCU and one end of the current detection resistor, and the other end of the current detection resistor is connected to the negative electrode N- of the DC bus power supply; the connection end of the upper bridge arm and the lower bridge arm in each bridge arm is used as an output end, and the output end is respectively connected to the input end of the fan or the input end of the compressor.

8. The control circuit of the air conditioner fan according to claim 1, characterized in that: The control circuit also includes a temperature sensing module, which includes at least one temperature sensing unit, an input end of the temperature sensing unit is connected to a second input power supply, and an output end of the temperature sensing unit is connected to a temperature detection pin of a single-chip microcomputer MCU, wherein the temperature sensing unit is arranged on one side of the first driving module and the second driving module to enable the single-chip microcomputer MCU to detect the temperature of the two driving modules.

9. A method for controlling an air conditioner, characterized in that: The method is applied to the control circuit of the air conditioner fan according to any one of claims 1 to 8, and the method comprises the following steps: The single chip microcomputer obtains the voltage of the DC capacitor E1 through the detection circuit and determines whether the fan rotates abnormally based on the voltage: If so, the single chip microcomputer controls the second driving module to drive the compressor to start with a preset duty cycle PWM, and the preset duty cycle is set so that the direction of the magnetic pole generated by the current in the stator of the compressor is the same as the direction of the rotor of the compressor, or the steering torque generated between the magnetic pole generated by the current in the stator of the compressor and the magnetic field of the rotor of the compressor is lower than the starting torque for rotating the rotor of the compressor, so as to achieve that the compressor does not run during the process of consuming the electric energy stored in the DC capacitor E1; wherein the electric energy stored in the DC capacitor E1 is the electric energy that the fan converts wind energy into DC power through the first driving module and inputs into the DC capacitor E1 when the fan rotates.

10. An air conditioner, characterized in that: The air conditioner comprises a fan, a compressor, a control circuit for the air conditioner fan according to any one of claims 1 to 8, and a single chip microcomputer.

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