Fan control circuit, method and device, air conditioning equipment and storage medium

Abstract

The invention relates to a fan control circuit, method and device, air conditioning equipment and a storage medium. The method comprises the following steps: determining whether the operation state of a sampling line where each sampling resistor is located is abnormal or not by acquiring the sampling voltage of a three-phase sampling resistor in a fan control circuit, and when at least two sampling lines with normal operation states exist, determining whether the sampling line is abnormal or not according to the sampling voltage corresponding to the at least two sampling lines with normal operation states. And determining the operation phase current and the target duty ratio corresponding to the three-phase sampling line respectively, and controlling the normal operation of the fan according to the calculated operation phase current and the target duty ratio corresponding to the three-phase sampling line respectively, so as to realize the purpose that the fan is normally operated even if a certain sampling resistor is abnormal and the sampling line where the sampling resistor is located is abnormal. And the problem that the normal operation of the fan cannot be ensured when any sampling resistor in the existing air conditioner fan control circuit is abnormal is solved.

Description

Technical Field

[0001] The present application relates to the field of fan control, and in particular to a fan control circuit, method, device, air conditioning equipment and storage medium. Background Art

[0002] The abnormality of the current sampling resistor of the current air conditioner fan drive controller will cause the mainboard to fail, the fan to stop, and it cannot operate normally. The fan drive is based on sampling the fan phase current, and then the FOC algorithm is used to realize the operation of the fan. However, if any sampling resistor used to realize the fan phase current sampling in the fan control circuit is abnormal, it will cause the line abnormality to cause the fan to stop, and the normal operation of the fan cannot be guaranteed. Summary of the invention

[0003] The present application provides a fan control circuit, method, device, air conditioning equipment and storage medium to solve the problem that if any sampling resistor in the existing air conditioning fan control circuit is abnormal, the normal operation of the fan cannot be guaranteed.

[0004] In a first aspect, the present application provides a fan control method, the method comprising:

[0005] When the fan control circuit is in working state, obtaining the sampling voltage of the three-phase sampling resistor in the fan control circuit within a preset operation cycle;

[0006] Determine the operating state of the sampling circuits where each sampling resistor is located according to the sampling voltages of the three-phase sampling resistors, wherein each sampling resistor is located in a different sampling circuit;

[0007] When there are at least two sampling circuits in normal operation, the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits are determined according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation;

[0008] Based on the operating phase currents and target duty cycles respectively corresponding to the three-phase sampling circuits, the normal operation of the fan is controlled.

[0009] Optionally, determining the operating state of the sampling circuit where each sampling resistor is located according to the sampling voltage of the three-phase sampling resistor includes:

[0010] When the sampling voltage of the target resistor is a non-preset voltage value, determining that the operation state of the sampling circuit where the target resistor is located is normal, wherein the target resistor is the sampling resistor of any phase; or,

[0011] When the sampling voltage of the target resistor is a preset voltage value, it is determined that the operation state of the sampling circuit where the target resistor is located is abnormal.

[0012] Optionally, when the sampled voltage of the target resistor is a preset voltage value, determining that the operation state of the sampling circuit where the target resistor is located is abnormal includes:

[0013] When the sampling voltage of the target resistor is a first voltage value, determining that the operation state of the sampling circuit where the target resistor is located is a circuit-breaking abnormality;

[0014] When the sampling voltage of the target resistor is a second voltage value, it is determined that the operating state of the sampling circuit where the target resistor is located is a short circuit abnormality, wherein the preset voltage value includes the first voltage value and the second voltage value, the first voltage value is half of the power supply, and the second voltage value is zero.

[0015] Optionally, when there are at least two sampling circuits in normal operation, determining the operating phase currents and target duty cycles respectively corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation includes:

[0016] When there are two sampling lines in normal operation, the sampling voltages corresponding to the sampling lines in normal operation of the two phases are converted into corresponding sampling currents;

[0017] Determine the operating phase currents corresponding to the three-phase sampling circuits respectively according to the two-phase sampling currents;

[0018] Determining a preset duty cycle that is less than the full-value duty cycle as a target duty cycle;

[0019] The controlling the normal operation of the fan based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits includes: controlling the normal operation of the fan after restarting based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits.

[0020] Optionally, when there are two sampling lines in normal operation, converting the sampling voltages corresponding to the sampling lines in normal operation of two phases into corresponding sampling currents includes:

[0021] When there is a sampling line with a short circuit abnormal operation state, the sampling voltage corresponding to the sampling line with two-phase normal operation states is converted into the corresponding sampling current; or,

[0022] When there is a sampling line with an abnormal operating state of a circuit breaker, the sampling line with the abnormal operating state is determined as an abnormal line, and after controlling the relay in the abnormal line to close, the sampling voltage corresponding to the sampling line with a normal operating state of two phases is converted into a corresponding sampling current.

[0023] Optionally, when there are at least two sampling circuits in normal operation, determining the operating phase currents and target duty cycles respectively corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation includes:

[0024] When there are three sampling lines in normal operation state, obtaining sampling windows corresponding to the three-phase sampling lines respectively;

[0025] Sorting the sampling windows corresponding to the three-phase sampling lines in descending order of the corresponding duration of the sampling windows to obtain a window sorting result;

[0026] Determine the operating phase currents corresponding to the sampling lines of the three phases respectively according to the sampling voltages corresponding to the first two sampling lines in the window sorting result;

[0027] The full value duty cycle is determined as the target duty cycle.

[0028] Optionally, after determining the operating status of the sampling circuits where the sampling resistors are located according to the sampling voltages of the three-phase sampling resistors, the method further includes:

[0029] When there are at least two sampling lines with abnormal operation status, corresponding fault prompt information is output according to the abnormal type of the sampling line of each phase, wherein the abnormal type includes short circuit abnormality and open circuit abnormality.

[0030] In a second aspect, the present application provides a fan control device, the device comprising:

[0031] An acquisition module, used for acquiring the sampling voltage of the three-phase sampling resistor in the fan control circuit within a preset operation cycle when the fan control circuit is in a working state;

[0032] A state judgment module, used to determine the operating state of the sampling circuit where each sampling resistor is located according to the sampling voltage of the three-phase sampling resistor, wherein each sampling resistor is located in a different sampling circuit;

[0033] A calculation module, used for determining the operating phase currents and target duty ratios respectively corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operating states when there are at least two sampling circuits in normal operating states;

[0034] The control module is used to control the normal operation of the fan based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits.

[0035] In a third aspect, the present application provides a fan control circuit, which includes an intelligent power module, a three-phase sampling circuit and a fan control device that are electrically connected to each other, and each phase of the sampling circuit includes a sampling resistor, a current limiting resistor, a transistor, a relay, a freewheeling diode and a filter circuit. The sampling resistor is respectively connected to the fan control device, the intelligent power module, and the relay. The relay is connected in parallel with the freewheeling diode and the filter capacitor and then connected to the emitter of the transistor. The base of the transistor is connected to the fan control device via the current limiting resistor, and the collector of the transistor is grounded.

[0036] In a fourth aspect, the present application provides an air-conditioning device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned fan control method when executing the computer program.

[0037] In a fifth aspect, the present application also provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the above-mentioned wind turbine control method.

[0038] The above technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application, when the fan control circuit is in a working state, obtains the sampling voltage of the three-phase sampling resistor in the fan control circuit within a preset operating cycle; determines the operating state of the sampling circuit where each sampling resistor is located according to the sampling voltage of the three-phase sampling resistor, wherein each sampling resistor is located in a different sampling circuit; when there are at least two sampling circuits with normal operating states, determines the operating phase current and the target duty cycle corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits with normal operating states; and controls the normal operation of the fan based on the operating phase current and the target duty cycle corresponding to the three-phase sampling circuits.

[0039] Based on the above method, by obtaining the sampling voltages of the three-phase sampling resistors in the fan control circuit, it is determined whether the operating status of the sampling circuits where the sampling resistors are located is abnormal. When there are at least two sampling circuits with normal operating status, it means that one sampling resistor may be abnormal, causing the sampling circuit where the sampling resistor is located to be abnormal, or all sampling resistors may be normal, making all sampling circuits normal. Even in the case where one sampling resistor is abnormal and causes the sampling circuit to be abnormal, the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits can still be determined according to the sampling voltages corresponding to at least two sampling circuits with normal operating status. The fan is controlled to operate normally according to the calculated operating phase currents and target duty cycles corresponding to the three-phase sampling circuits. In this way, even if a certain sampling resistor is abnormal and causes the sampling circuit where it is located to be abnormal, the normal operation of the fan can still be guaranteed, which solves the problem that the normal operation of the fan cannot be guaranteed if any sampling resistor in the existing air-conditioning fan control circuit is abnormal. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0042] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0043] Figure 1 A schematic diagram of the structure of a fan control circuit provided in an embodiment of the present application;

[0044] Figure 2 A schematic flow chart of a fan control method provided in an embodiment of the present application;

[0045] Figure 3 A schematic flow chart of a fan control method provided in an embodiment of the present application;

[0046] Figure 4 A structural block diagram of a fan control device provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the internal structure of an air-conditioning device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0049] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0050] Figure 1 FIG. 1 is a schematic diagram of the structure of a fan control circuit in an embodiment. Figure 1 The fan control method is applied to a fan control circuit. The fan control circuit includes an intelligent power module, a three-phase sampling circuit and a fan control device electrically connected to each other. Each phase of the sampling circuit includes a sampling resistor, a current limiting resistor, a transistor, a relay, a freewheeling diode and a filter circuit. The sampling resistor is respectively connected to the fan control device, the intelligent power module and the relay. The relay is connected to the freewheeling diode and the filter capacitor in parallel and then connected to the emitter of the transistor. The base of the transistor is connected to the fan control device via the current limiting resistor, and the collector of the transistor is grounded.

[0051] Specifically, the intelligent power module is recorded as an IPM module, and the fan control device is recorded as an MCU. Since the structure of each phase sampling circuit is the same, only the connection structure of one phase sampling circuit is recorded. The three-phase sampling circuit includes a phase current sampling resistor RS1, a phase current sampling resistor RS2, a phase current sampling resistor RS3, a bus current sampling resistor RS4, a freewheeling diode D1, a freewheeling diode D2, a freewheeling diode D3, a filter capacitor C1, a filter capacitor C2, a filter capacitor C3, a relay K1, a relay K2, a relay K3, a transistor Q1, a transistor Q2, a transistor Q3, a current limiting resistor R1, a current limiting resistor R2, a current limiting resistor R3, a bootstrap capacitor C4, a bootstrap capacitor C5, and a bootstrap capacitor C6, wherein the freewheeling diode is used to prevent the back electromotive force of the coil from being too high and damaging the relay when the relay coil is powered off. The current passing through the resistor RS4 is the bus current, which is used to protect the fan control circuit to prevent excessive current and burn out the components in the fan control circuit.

[0052] The MCU has an acquisition module, and the acquisition module includes an ADC module, a PWM module, and an op amp module. The power supply VDD is the power supply of the MCU, the power supply VCC provides a low-voltage power supply for the relay and the IPM module, and the power supply VDC provides a high-voltage power supply for the IPM module. The three-phase currents of U, V, and W form corresponding sampling voltages through sampling resistors RS1, RS2, and RS3, which are further amplified by the op amp module in the MCU, and then the corresponding numerical voltage is calculated through the ADC module, and then the corresponding current is inversely calculated. The PWM module outputs SVPWM through 6 control lines to control the output of the IPM module, and the output is a waveform for driving the PMSM fan through bootstrap capacitors C4, C5, and C6. When one of the three-phase lines where the sampling resistors RS1, RS2, and RS3 are located is broken, the lines corresponding to the S_IU pin, S_IV pin, and S_IW pin of the MCU are controlled to be short-circuited, and the sampling mode of the phase current is changed, thereby restarting the fan to ensure that the fan can continue to operate normally.

[0053] In one embodiment, Figure 2 is a flow chart of a fan control method in one embodiment, referring to Figure 2 , provides a fan control method. This embodiment mainly applies this method to the above Figure 1 Taking the fan control device in the example as an example, the fan control method specifically includes the following steps:

[0054] Step S210, when the fan control circuit is in working state, obtaining the sampled voltage of the three-phase sampling resistor in the fan control circuit within a preset operation cycle.

[0055] Specifically, the fan control circuit is in a working state including a fan start-up state and a fan operation state. The preset operation cycle is an operation cycle corresponding to the fan. The preset operation cycle is related to the selection of the fan. The sampling voltage of the sampling resistor in the three-phase sampling circuit of the fan within the preset operation cycle is obtained. The sampling resistor here is the aforementioned phase current sampling resistor, and each sampling resistor corresponds to a sampling voltage.

[0056] Step S220, determining the operating state of the sampling circuits where the sampling resistors are located according to the sampling voltages of the three-phase sampling resistors, wherein each of the sampling resistors is located in a different sampling circuit.

[0057] Specifically, the operating state of the sampling circuit where the sampling resistor is located is determined based on the sampling voltage of each phase sampling resistor. The operating state is normal or abnormal. The sampling voltage corresponding to the sampling resistor in normal or abnormal conditions is different. Therefore, the normal state of the sampling resistor can be judged by the sampling voltage, and then the operating state of the sampling circuit where the sampling resistor is located is determined. The normal state of the sampling resistor affects the operating state of the sampling circuit where the sampling resistor is located.

[0058] Step S230, when there are at least two sampling circuits in normal operation, determine the operating phase currents and target duty cycles respectively corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation.

[0059] Specifically, there are at least two sampling circuits with normal operation status, which means that one of the three-phase sampling circuits may have an abnormal operation status, or the operation status of the three-phase sampling circuits is normal. Even if one phase sampling circuit is abnormal, the operation phase currents corresponding to the three-phase sampling circuits can still be calculated based on the sampling voltage corresponding to the sampling circuit with normal operation status, and the target duty cycle for controlling the operation of the fan can be determined.

[0060] Step S240, controlling the normal operation of the fan based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits.

[0061] Specifically, the fan is restarted according to the calculated operating phase current and the target duty cycle, so that the fan can continue to operate normally even if one sampling resistor is abnormal. This solves the problem that the fan cannot operate normally if any sampling resistor in the existing air-conditioning fan control circuit is abnormal.

[0062] In one embodiment, the step of determining the operating state of the sampling circuits where the sampling resistors are located according to the sampling voltages of the three-phase sampling resistors includes:

[0063] When the sampling voltage of the target resistor is a non-preset voltage value, determining that the operation state of the sampling circuit where the target resistor is located is normal, wherein the target resistor is the sampling resistor of any phase; or,

[0064] When the sampling voltage of the target resistor is a preset voltage value, it is determined that the operation state of the sampling circuit where the target resistor is located is abnormal.

[0065] Specifically, the sampling voltage of the sampling resistor is compared with the preset voltage value to determine the operating state of the sampling circuit where the sampling resistor is located. The preset voltage value is used to indicate the voltage value of the sampling resistor in an abnormal situation. Therefore, when the sampling voltage is a non-preset voltage value, it indicates that the sampling resistor is in a normal state, and then the operating state of the sampling circuit where the sampling resistor is located is determined to be normal. If the sampling voltage is the preset voltage value, it means that the sampling voltage of the sampling resistor meets the voltage condition of the sampling resistor in an abnormal situation, and the sampling resistor is determined to be in an abnormal state, and then the operating state of the sampling circuit where the abnormal sampling resistor is located is determined to be abnormal. By comparing the voltage, the operating state of the three-phase sampling circuit can be quickly determined, so that the determination of the phase current sampling method can be accelerated in the future, and the time consumption of abnormal judgment can be shortened.

[0066] In one embodiment, when the sampled voltage of the target resistor is a preset voltage value, determining that the operation state of the sampling circuit where the target resistor is located is abnormal includes:

[0067] When the sampling voltage of the target resistor is a first voltage value, determining that the operation state of the sampling circuit where the target resistor is located is a circuit-breaking abnormality;

[0068] When the sampling voltage of the target resistor is a second voltage value, it is determined that the operating state of the sampling circuit where the target resistor is located is a short circuit abnormality, wherein the preset voltage value includes the first voltage value and the second voltage value, the first voltage value is half of the power supply, and the second voltage value is zero.

[0069] Specifically, the first voltage value is half of the power supply, and the power supply is VDD. Therefore, the first voltage value is VDD / 2. When the sampling voltage of the sampling resistor is VDD / 2, it indicates that a circuit breakage abnormality has occurred in the sampling circuit where the sampling resistor is located. The second voltage value is zero. When the sampling voltage of the sampling resistor is 0, it indicates that a short circuit abnormality has occurred in the sampling circuit where the sampling resistor is located. Based on the same judgment logic, the sampling voltage of each phase sampling resistor is abnormally diagnosed to determine the operating status of each phase sampling circuit in the three phases. In this way, the abnormality type of the sampling circuit can be further accurately determined, so that corresponding maintenance strategies can be adopted for specific abnormality types in the future.

[0070] In one embodiment, when there are at least two sampling circuits in normal operation, determining the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits respectively according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation includes:

[0071] When there are two sampling lines in normal operation, the sampling voltages corresponding to the sampling lines in normal operation of the two phases are converted into corresponding sampling currents;

[0072] Determine the operating phase currents corresponding to the three-phase sampling circuits respectively according to the two-phase sampling currents;

[0073] Determining a preset duty cycle that is less than the full-value duty cycle as a target duty cycle;

[0074] The controlling the normal operation of the fan based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits includes: controlling the normal operation of the fan after restarting based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits.

[0075] Specifically, when it is determined that the operating status of two-phase sampling circuits among the three-phase sampling circuits is normal, and there is an abnormal sampling circuit in one phase, the operating phase current of the three-phase sampling circuit can be calculated according to the sampling voltage corresponding to the normal two-phase sampling circuits. Specifically, the sampling voltage corresponding to the normal two-phase sampling circuit is first converted into the corresponding sampling current, and the sampling current of the normal sampling circuit is used as the operating phase current of the sampling circuit of the phase, and the operating phase current corresponding to the abnormal phase sampling circuit is calculated based on the principle that the sum of the three-phase sampling currents is 0. The sum of the three-phase sampling currents is 0, that is, Ia+Ib+Ic=0. Assuming that the a-phase sampling circuit is an abnormal circuit, the operating phase current corresponding to the a-phase sampling circuit can be calculated according to the sampling currents of the b-phase and c-phase sampling circuits.

[0076] When the three-phase sampling circuits are normal, the full duty cycle can be used to control the normal operation of the fan. Due to the existence of sampling circuits with abnormal operation status, the two-phase sampling circuits cannot meet the operation requirements of the full duty cycle. If the fan is controlled according to the full duty cycle, it will cause the fan to exceed the duty cycle and lose step. Therefore, it is necessary to limit the operation duty cycle of the fan, and determine the preset duty cycle less than the full duty cycle as the target duty cycle. The full duty cycle is 1, and the preset duty cycle can be 0.95, 0.9, 0.85, 0.8, etc., which is related to the ADC sampling time and conversion time. It can be customized in combination with the actual application to limit the operation duty cycle of the fan to avoid the fan from malfunctioning when the sampling resistor is abnormal and running at the full duty cycle. Based on the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits, the fan is controlled to operate normally after restarting.

[0077] In one embodiment, when there are two sampling circuits in normal operation, converting the sampling voltages corresponding to the sampling circuits in normal operation of two phases into corresponding sampling currents includes:

[0078] When there is a sampling line with a short circuit abnormal operation state, the sampling voltage corresponding to the sampling line with two-phase normal operation states is converted into the corresponding sampling current; or,

[0079] When there is a sampling line with an abnormal operating state of a circuit breaker, the sampling line with the abnormal operating state is determined as an abnormal line, and after controlling the relay in the abnormal line to close, the sampling voltage corresponding to the sampling line with a normal operating state of two phases is converted into a corresponding sampling current.

[0080] Specifically, when there is a sampling circuit with a phase short circuit abnormality in the three-phase sampling circuit, the sampling voltage corresponding to the two-phase sampling circuit that is operating normally can be directly converted into the corresponding sampling current. However, if there is a sampling circuit with a phase open circuit abnormality in the three-phase sampling circuit, it is necessary to first control the relay in the abnormal circuit to close to ensure that the winding current passes through the abnormal circuit. If the relay in the abnormal circuit is not closed, the condition that all three-phase circuits can output phase current cannot be achieved, and the fan cannot be controlled to operate normally after restarting. Therefore, when a circuit open abnormality occurs in the three-phase sampling circuit, it is necessary to close the relay of the abnormal circuit, and then convert the sampling voltage of the other normal two-phase sampling circuit into the corresponding sampling current, so as to ensure that the fan can operate normally after restarting for different abnormal types.

[0081] In one embodiment, when there are at least two sampling circuits in normal operation, determining the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits respectively according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation includes:

[0082] When there are three sampling lines in normal operation state, obtaining sampling windows corresponding to the three-phase sampling lines respectively;

[0083] Sorting the sampling windows corresponding to the three-phase sampling lines in descending order of the corresponding duration of the sampling windows to obtain a window sorting result;

[0084] Determine the operating phase currents corresponding to the sampling lines of the three phases respectively according to the sampling voltages corresponding to the first two sampling lines in the window sorting result;

[0085] The full value duty cycle is determined as the target duty cycle.

[0086] Specifically, when the operating states of the three-phase sampling circuits are all normal, it is necessary to obtain the sampling windows corresponding to each of the three-phase sampling circuits. The sampling windows are used to indicate the specific time intervals for each sampling circuit to sample the phase current, and are also used to indicate the time window for the lower bridge of each phase sampling circuit to be turned on. Different sampling circuits may correspond to different sampling windows. The sampling windows corresponding to the three-phase sampling circuits are sorted in descending order according to the corresponding duration of the sampling windows, so as to obtain the window sorting result. The sampling voltages corresponding to the first two sampling circuits are selected in the window sorting result to determine the operating phase currents corresponding to the three-phase sampling circuits. After determining the two-phase sampling circuits for calculating the operating phase current, the calculation process of calculating the operating phase current based on the sampling voltage is the same as the above-mentioned embodiment, that is, the sampling voltages corresponding to the two-phase sampling circuits are converted into the sampling currents corresponding to the two sampling circuits, and the converted sampling currents are used as the operating phase currents. Then, based on the principle that the sum of the three-phase currents is zero, the operating phase current corresponding to the last phase sampling circuit is calculated.

[0087] Since the operating status of the three-phase sampling circuits are all normal, the fan operation can be controlled according to the full duty cycle, so the full duty cycle is used as the target duty cycle.

[0088] In one embodiment, after determining the operating state of the sampling circuits where the sampling resistors are located according to the sampling voltages of the three-phase sampling resistors, the method further includes:

[0089] When there are at least two sampling lines with abnormal operation status, corresponding fault prompt information is output according to the abnormal type of the sampling line of each phase, wherein the abnormal type includes short circuit abnormality and open circuit abnormality.

[0090] Specifically, when there are at least two sampling lines with abnormal operating status, it means that there may be two sampling lines with abnormal operating status, or the operating status of the three-phase sampling lines are all abnormal. At this time, the operating phase current of the three-phase sampling lines cannot be calculated based on the sampling voltage of one normal sampling line or the sampling voltage of the three-phase sampling line with abnormal operation. Then, the corresponding fault prompt information is output according to the abnormal type of each phase sampling line, so that targeted maintenance can be quickly carried out on the sampling lines with abnormal operation of each phase, which can improve the maintenance efficiency.

[0091] In a specific embodiment, referring to Figure 3 , the MCU issues a command to start the fan. At the same time, the MCU collects the sampling voltage of the three-phase sampling resistor, converts the sampling voltage into the corresponding sampling current, selects the two-phase sampling line with a larger sampling window, and realizes the operation of the motor through the FOC algorithm.

[0092] After the MCU obtains the sampling voltage of the three-phase sampling resistor, if the obtained sampling voltage is not VDD / 2, 0 within the preset operation cycle, it means that the three-phase sampling circuit is operating normally, and the sampling voltage of the two-phase sampling resistor with a larger sampling window in the three-phase is converted into the corresponding sampling current and used as the operating phase current. According to Ia+Ib+Ic=0, the operating phase current of the last phase can be calculated. Restarting the fan according to the three-phase operating phase current and the full duty cycle can achieve normal operation of the fan.

[0093] If the sampled voltage is VDD / 2, the sampling circuit of the phase of VDD / 2 is judged to be open circuit abnormal, and then the number of sampling circuits of VDD / 2 is judged. If the number is greater than 1, more than two phases of the damaged sampling circuits cannot be reconstructed, and a fault is reported, indicating that the sampling circuit is damaged. If the number = 1, the corresponding relay is closed, and the sampling voltage corresponding to the two-phase normal circuit is converted into the corresponding operating phase current. According to Ia+Ib+Ic=0, the current of each phase can be calculated, and the maximum duty cycle is limited to restart the fan.

[0094] If the sampled voltage is 0, the resistance circuit of the phase that is 0 is judged to be short-circuited, and then the number of sampled circuits that are 0 is judged. If the number is greater than 1, more than two phases of the damaged sampled circuits cannot be reconstructed, and a fault is reported, indicating that the sampled circuit is damaged. If the number = 1, the sampled voltage corresponding to the two-phase normal circuit is converted into the corresponding operating phase current. According to Ia+Ib+Ic=0, the current of each phase can be calculated and the fan can be restarted.

[0095] Figure 2 and Figure 3 FIG. 1 is a flow chart of a fan control method in one embodiment. It should be understood that although Figure 2 and Figure 3 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2 and Figure 3 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0096] In one embodiment, Figure 4 As shown, a fan control device is provided, comprising:

[0097] The acquisition module 310 is used to obtain the sampling voltage of the three-phase sampling resistor in the fan control circuit within a preset operation cycle when the fan control circuit is in a working state; wherein the acquisition module 310 includes an ADC module, a PWM module, and an operational amplifier module, which are used to determine the corresponding value of the sampling voltage.

[0098] A state judgment module 320 is used to determine the operating state of the sampling circuit where each sampling resistor is located according to the sampling voltage of the three-phase sampling resistor, wherein each sampling resistor is located in a different sampling circuit;

[0099] A calculation module 330 is used to determine the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits respectively according to the sampling voltages corresponding to the two-phase sampling circuits in normal operating states when there are at least two sampling circuits in normal operating states;

[0100] The control module 340 is used to control the normal operation of the fan based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits.

[0101] In one embodiment, the state determination module 320 is further configured to:

[0102] When the sampling voltage of the target resistor is a non-preset voltage value, determining that the operation state of the sampling circuit where the target resistor is located is normal, wherein the target resistor is the sampling resistor of any phase; or,

[0103] When the sampling voltage of the target resistor is a preset voltage value, it is determined that the operation state of the sampling circuit where the target resistor is located is abnormal.

[0104] In one embodiment, the state determination module 320 is further configured to:

[0105] When the sampling voltage of the target resistor is a first voltage value, determining that the operation state of the sampling circuit where the target resistor is located is a circuit-breaking abnormality;

[0106] When the sampling voltage of the target resistor is a second voltage value, it is determined that the operating state of the sampling circuit where the target resistor is located is a short circuit abnormality, wherein the preset voltage value includes the first voltage value and the second voltage value, the first voltage value is half of the power supply, and the second voltage value is zero.

[0107] In one embodiment, the calculation module 330 is further configured to:

[0108] When there are two sampling lines in normal operation, the sampling voltages corresponding to the sampling lines in normal operation of the two phases are converted into corresponding sampling currents;

[0109] Determine the operating phase currents corresponding to the three-phase sampling circuits respectively according to the two-phase sampling currents;

[0110] A preset duty cycle that is less than the full-value duty cycle is determined as the target duty cycle; based on the operating phase currents corresponding to the three-phase sampling circuits and the target duty cycle, the normal operation of the fan is controlled, including: based on the operating phase currents corresponding to the three-phase sampling circuits and the target duty cycle, the fan is controlled to operate normally after restarting.

[0111] In one embodiment, the calculation module 330 is further configured to:

[0112] When there is a sampling line with a short circuit abnormal operation state, the sampling voltage corresponding to the sampling line with two-phase normal operation states is converted into the corresponding sampling current; or,

[0113] When there is a sampling line with an abnormal operating state of a circuit breaker, the sampling line with the abnormal operating state is determined as an abnormal line, and after controlling the relay in the abnormal line to close, the sampling voltage corresponding to the sampling line with a normal operating state of two phases is converted into a corresponding sampling current.

[0114] In one embodiment, the calculation module 330 is further configured to:

[0115] When there are three sampling lines in normal operation state, obtaining sampling windows corresponding to the three-phase sampling lines respectively;

[0116] Sorting the sampling windows corresponding to the three-phase sampling lines in descending order of the corresponding duration of the sampling windows to obtain a window sorting result;

[0117] Determine the operating phase currents corresponding to the sampling lines of the three phases respectively according to the sampling voltages corresponding to the first two sampling lines in the window sorting result;

[0118] The full value duty cycle is determined as the target duty cycle.

[0119] In one embodiment, the control module 340 is further configured to:

[0120] When there are at least two sampling lines with abnormal operation status, corresponding fault prompt information is output according to the abnormal type of the sampling line of each phase, wherein the abnormal type includes short circuit abnormality and open circuit abnormality.

[0121] like Figure 5 As shown, an embodiment of the present application provides an air conditioning device, including a processor 711, a communication interface 712, a memory 713 and a communication bus 714, wherein the processor 711, the communication interface 712, and the memory 713 communicate with each other through the communication bus 714;

[0122] Memory 713, used for storing computer programs;

[0123] The processor 711 is used to implement the fan control method provided by any one of the above method embodiments when executing the program stored in the memory 713.

[0124] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present application, and does not constitute a limitation on the air-conditioning equipment to which the scheme of the present application is applied. The specific air-conditioning equipment may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0125] In one embodiment, the fan control device provided by the present application can be implemented in the form of a computer program. The computer program can be Figure 5 The memory of the air conditioning device can store various program modules constituting the fan control device, for example, Figure 4 The acquisition module 310, state judgment module 320, calculation module 330 and control module 340 are shown. The computer program composed of various program modules enables the processor to execute the wind turbine control method of each embodiment of the present application described in this specification.

[0126] Figure 5 The air conditioning equipment shown can be Figure 4 The acquisition module 310 in the fan control device shown is executed when the fan control circuit is in the working state, and acquires the sampling voltage of the three-phase sampling resistor in the fan control circuit within the preset operation cycle. The air-conditioning device can determine the operating state of the sampling circuit where each sampling resistor is located according to the sampling voltage of the three-phase sampling resistor through the state judgment module 320, wherein each sampling resistor is located in a different sampling circuit. The air-conditioning device can determine the operating phase current and the target duty cycle corresponding to the three-phase sampling circuits according to the sampling voltage corresponding to the two-phase sampling circuits with normal operating states through the calculation module 330 when there are at least two sampling circuits with normal operating states. The air-conditioning device can control the normal operation of the fan based on the operating phase current and the target duty cycle corresponding to the three-phase sampling circuits through the control module 340.

[0127] An embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the fan control method provided by any of the aforementioned method embodiments is implemented.

[0128] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0129] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for enabling an air-conditioning device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0130] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative can be used.

[0131] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fan control method, characterized in that: The method comprises: When the fan control circuit is in working state, obtaining the sampling voltage of the three-phase sampling resistor in the fan control circuit within a preset operation cycle; Determine the operating state of the sampling circuits where each sampling resistor is located according to the sampling voltages of the three-phase sampling resistors, wherein each sampling resistor is located in a different sampling circuit; When there are at least two sampling circuits in normal operation, the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits are determined according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation; Based on the operating phase currents and target duty cycles respectively corresponding to the three-phase sampling circuits, the normal operation of the fan is controlled.

2. The method according to claim 1, characterized in that: The step of determining the operating state of the sampling circuits where the sampling resistors are located according to the sampling voltages of the three-phase sampling resistors includes: When the sampling voltage of the target resistor is a non-preset voltage value, determining that the operation state of the sampling circuit where the target resistor is located is normal, wherein the target resistor is the sampling resistor of any phase; or, When the sampling voltage of the target resistor is a preset voltage value, it is determined that the operation state of the sampling circuit where the target resistor is located is abnormal.

3. The method according to claim 2, characterized in that When the sampled voltage of the target resistor is a preset voltage value, determining that the operation state of the sampling circuit where the target resistor is located is abnormal includes: When the sampling voltage of the target resistor is a first voltage value, determining that the operation state of the sampling circuit where the target resistor is located is a circuit-breaking abnormality; When the sampling voltage of the target resistor is a second voltage value, it is determined that the operating state of the sampling circuit where the target resistor is located is a short circuit abnormality, wherein the preset voltage value includes the first voltage value and the second voltage value, the first voltage value is half of the power supply, and the second voltage value is zero.

4. The method according to claim 1, characterized in that: When there are at least two sampling circuits in normal operation, determining the operating phase currents and target duty cycles respectively corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation, includes: When there are two sampling lines in normal operation, the sampling voltages corresponding to the sampling lines in normal operation of the two phases are converted into corresponding sampling currents; Determine the operating phase currents corresponding to the three-phase sampling circuits respectively according to the two-phase sampling currents; Determining a preset duty cycle that is less than the full-value duty cycle as a target duty cycle; The controlling the normal operation of the fan based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits includes: controlling the normal operation of the fan after restarting based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits.

5. The method according to claim 4, characterized in that When there are two sampling lines in normal operation, the sampling voltages corresponding to the sampling lines in normal operation of the two phases are converted into corresponding sampling currents, including: When there is a sampling line with a short circuit abnormal operation state, the sampling voltage corresponding to the sampling line with two-phase normal operation states is converted into the corresponding sampling current; or, When there is a sampling line with an abnormal operating state of a circuit breaker, the sampling line with the abnormal operating state is determined as an abnormal line, and after controlling the relay in the abnormal line to close, the sampling voltage corresponding to the sampling line with a normal operating state of two phases is converted into a corresponding sampling current.

6. The method according to claim 1, characterized in that When there are at least two sampling circuits in normal operation, determining the operating phase currents and target duty cycles respectively corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation, includes: When there are three sampling lines in normal operation state, obtaining sampling windows corresponding to the three-phase sampling lines respectively; Sorting the sampling windows corresponding to the three-phase sampling lines in descending order of the corresponding duration of the sampling windows to obtain a window sorting result; Determine the operating phase currents corresponding to the sampling lines of the three phases respectively according to the sampling voltages corresponding to the first two sampling lines in the window sorting result; The full value duty cycle is determined as the target duty cycle.

7. The method according to claim 1, characterized in that After determining the operating status of the sampling circuits where the sampling resistors are located according to the sampling voltages of the three-phase sampling resistors, the method further includes: When there are at least two sampling lines with abnormal operation status, corresponding fault prompt information is output according to the abnormal type of the sampling line of each phase, wherein the abnormal type includes short circuit abnormality and open circuit abnormality.

8. A fan control device, characterized in that: The device comprises: An acquisition module, used for acquiring the sampling voltage of the three-phase sampling resistor in the fan control circuit within a preset operation cycle when the fan control circuit is in a working state; A state judgment module, used to determine the operating state of the sampling circuit where each sampling resistor is located according to the sampling voltage of the three-phase sampling resistor, wherein each sampling resistor is located in a different sampling circuit; A calculation module, used for determining the operating phase currents and target duty ratios respectively corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operating states when there are at least two sampling circuits in normal operating states; The control module is used to control the normal operation of the fan based on the operating phase currents and the target duty cycle respectively corresponding to the three-phase sampling circuits.

9. A fan control circuit, characterized in that: The fan control circuit includes an intelligent power module, a three-phase sampling circuit and a fan control device as described in right 8, which are electrically connected to each other. Each phase of the sampling circuit includes a sampling resistor, a current limiting resistor, a transistor, a relay, a freewheeling diode and a filter circuit. The sampling resistor is respectively connected to the fan control device, the intelligent power module and the relay. The relay is connected in parallel with the freewheeling diode and the filter capacitor and then connected to the emitter of the transistor. The base of the transistor is connected to the fan control device via the current limiting resistor, and the collector of the transistor is grounded.

10. An air conditioning device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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