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

Abstract

The application relates to a fan control circuit, a method, a 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 by acquiring the sampling voltage of the three-phase sampling resistor in the fan control circuit; when at least two sampling lines with normal operation states exist, the corresponding operation phase current and target duty ratio of the three-phase sampling lines can be determined according to the sampling voltage corresponding to the at least two sampling lines with normal operation states; the fan is controlled to normally operate according to the calculated operation phase current and target duty ratio corresponding to the three-phase sampling lines, so that the normal operation of the fan can be ensured even if the sampling line where a certain sampling resistor is located is abnormal due to the abnormality of the sampling resistor, 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] Current air conditioner fan drive controllers with abnormal current sampling resistors can cause the mainboard to fail, stalling the fan and preventing normal operation. The fan drive relies on sampling the fan phase current and then using the Field-of-Center Control (FOC) algorithm to operate the fan. However, if any of the sampling resistors used to sample the fan phase current in the fan control circuit fails, the circuit will fail, causing the fan to stall and failing to maintain normal operation. 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 wind turbine control method, the method comprising:

[0005] When the fan control circuit is in an operating state, obtaining the sampled voltages of the three-phase sampling resistors in the fan control circuit within a preset operating cycle;

[0006] Determining 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 status of the sampling circuits where the sampling resistors are located according to the sampling voltages of the three-phase sampling resistors includes:

[0010] When the sampling voltage of the target resistor is a non-preset voltage value, determining that the operating 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 operating 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 operating 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 breaker 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 operating states, determining the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits respectively according to the sampled voltages corresponding to the two-phase sampling circuits in normal operating states includes:

[0016] When there are two sampling lines in normal operation, the sampling voltages corresponding to the two sampling lines in normal operation 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] Controlling the normal operation of the fan based on the operating phase currents and target duty cycles 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 target duty cycles respectively corresponding to the three-phase sampling circuits.

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

[0021] When there is a sampling line with a short circuit abnormality, the sampling voltages corresponding to the sampling lines with two phases in normal operation are converted into corresponding sampling currents; 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 voltages corresponding to the sampling lines with two-phase normal operating states are converted into corresponding sampling currents.

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

[0029] When there are at least two sampling lines with abnormal operating 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, configured to acquire the sampled voltages of the three-phase sampling resistors in the fan control circuit within a preset operation cycle when the fan control circuit is in an operating state;

[0032] A state judgment module 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;

[0033] a calculation module for determining, 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 according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation;

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

[0035] In the 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. The sampling circuit of each phase includes a sampling resistor, a current limiting resistor, a transistor, a relay, a freewheeling diode and a filter capacitor. 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-mentioned 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 obtains the sampled voltages of the three-phase sampling resistors in the fan control circuit within a preset operating cycle when the fan control circuit is in an operating state; determines the operating state of the sampling circuits where each of the sampling resistors is located based on the sampled voltages of the three-phase sampling resistors, wherein each of the sampling resistors is located in a different sampling circuit; when there are at least two sampling circuits with normal operating states, determines the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits based on the sampled 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 currents and target duty cycles 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 respective sampling resistors are located is abnormal. When there are at least two sampling circuits with normal operating status, it is possible that one sampling resistor is abnormal, causing the sampling circuit where the sampling resistor is located to be abnormal, or all sampling resistors are normal, causing all sampling circuits to be normal. Even in the case where one sampling resistor is abnormal, causing 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 based on 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 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, thereby solving the problem that the normal operation of the fan cannot be guaranteed when 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

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

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

[0045] Figure 3 A 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] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] The disclosure below provides many different embodiments or examples for implementing different configurations of the present invention. To simplify the disclosure of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0050] Figure 1 FIG. 1 is a schematic diagram of the structure of a fan control circuit in one 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 capacitor. 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.

[0051] Specifically, the intelligent power module is denoted as the IPM module, and the fan control device is denoted as the MCU. Since the structure of each phase sampling circuit is identical, only the connection structure of one phase sampling circuit is recorded. The three-phase sampling circuit includes phase current sampling resistors RS1, RS2, and RS3, bus current sampling resistor RS4, freewheeling diodes D1, D2, and D3, filter capacitors C1, C2, and C3, relays K1, K2, and K3, transistors Q1, Q2, and Q3, current limiting resistors R1, R2, and R3, and bootstrap capacitors C4, C5, and C6. The freewheeling diode is used to prevent the coil's back electromotive force from being too high and damaging the relay when the relay coil is de-energized. The current passing through resistor RS4 is the bus current, which is used to protect the fan control circuit and prevent excessive current from burning out components within the fan control circuit.

[0052] The MCU has an acquisition module, which includes an ADC module, a PWM module, and an op amp module. Power supply VDD provides the MCU with power, power supply VCC provides low-voltage power to the relay and IPM module, and power supply VDC provides high-voltage power to the IPM module. The three-phase currents U, V, and W pass through sampling resistors RS1, RS2, and RS3 to form corresponding sampled voltages. These are further amplified by the op amp module within the MCU, then passed through the ADC module to calculate the corresponding numerical voltage, and then the corresponding current is inversely calculated. The PWM module outputs SVPWM via six control lines, controlling the output of the IPM module. The waveform that drives the PMSM fan is output through bootstrap capacitors C4, C5, and C6. If one of the three-phase lines containing sampling resistors RS1, RS2, and RS3 is broken, the lines corresponding to the MCU's S_IU, S_IV, and S_IW pins are shorted, changing the phase current sampling method and restarting the fan to ensure continued normal operation.

[0053] In one embodiment, Figure 2 A flow chart of a fan control method in one embodiment is shown in FIG. 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 an operating state, the sampling voltages of the three-phase sampling resistors in the fan control circuit are obtained 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 circuit where each sampling resistor is located according to the sampled voltages of the three-phase sampling resistors, wherein each sampling resistor 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 normal and abnormal conditions of the sampling resistor 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 corresponding to the three-phase sampling circuits according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation.

[0059] Specifically, the presence of at least two sampling circuits in normal operating states indicates that one of the three-phase sampling circuits may be operating abnormally, or that all three-phase sampling circuits may be operating normally. Even if one phase sampling circuit is abnormal, the operating phase currents corresponding to the three-phase sampling circuits can still be calculated based on the sampled voltages corresponding to the sampling circuits in normal operating states, thereby determining the target duty cycle for controlling wind turbine operation.

[0060] Step S240 , controlling the normal operation of the wind turbine based on the operating phase currents and target duty cycles 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. Even if one sampling resistor has an abnormality, the fan can continue to operate normally, which solves the problem that the fan cannot operate normally if any sampling resistor in the existing air-conditioning fan control circuit has an abnormality.

[0062] In one embodiment, determining the operating status of the sampling circuits where the three-phase sampling resistors are located according to the sampled 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 operating 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 operating state of the sampling circuit where the target resistor is located is abnormal.

[0065] Specifically, the sampled voltage of the sampling resistor is compared with a preset voltage value to determine the operating status 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 under abnormal conditions. Therefore, when the sampled voltage is not a preset voltage value, it indicates that the sampling resistor is in a normal state, and the operating status of the sampling circuit where the sampling resistor is located is determined to be normal. If the sampled voltage is the preset voltage value, it indicates that the sampled voltage of the sampling resistor meets the voltage condition of the sampling resistor under abnormal conditions, and the sampling resistor is determined to be in an abnormal state. The operating status of the sampling circuit where the abnormal sampling resistor is located is determined to be abnormal. By comparing the voltages, the operating status of the three-phase sampling circuit can be quickly determined, so that the determination of the phase current sampling method can be accelerated later, shortening the time required for abnormality judgment.

[0066] In one embodiment, when the sampled voltage of the target resistor is a preset voltage value, determining that the operating 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 breaker 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, which 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 short circuit anomaly 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 anomaly 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 diagnosed for anomalies, thereby determining 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 sampled 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 two sampling lines in normal operation 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] Controlling the normal operation of the fan based on the operating phase currents and target duty cycles 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 target duty cycles respectively corresponding to the three-phase sampling circuits.

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

[0076] When all three-phase sampling circuits are normal, the full duty cycle can be used to control the normal operation of the fan. Due to the presence of sampling circuits with abnormal operating status, the two-phase sampling circuits cannot meet the operating requirements of the full duty cycle. If the fan is continued to be 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 operating duty cycle of the fan, and determine the preset duty cycle that is 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 according to the actual application to limit the operating duty cycle of the fan to avoid the fan from malfunctioning due to running at the full duty cycle when the sampling resistor is abnormal. Based on the operating phase current and target duty cycle 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 lines with normal operating states, the sampling voltage corresponding to the two-phase sampling line with a normal operating state is converted into the corresponding sampling current, including:

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

[0079] When there is one sampling line with an open-circuit abnormal operating state, the sampling line with an abnormal operating state is determined as an abnormal line, and after the relay in the abnormal line is controlled to be closed, the sampling voltage corresponding to the two-phase sampling line with a normal operating state is converted into the corresponding sampling current.

[0080] Specifically, when there is one sampling line with a short-circuit abnormal operating state in the three-phase sampling line, the sampling voltage corresponding to the two-phase sampling line with a normal operating state can be directly converted into the corresponding sampling current. However, when there is one sampling line with an open-circuit abnormal operating state in the three-phase sampling line, the relay in the abnormal line needs to be closed first to ensure that there is a winding current in the abnormal line. If the relay in the abnormal line is not closed, the three-phase line cannot output a phase current, and the fan cannot be restarted and run normally. Therefore, when there is an open-circuit abnormal operating state in the three-phase sampling line, the relay in the abnormal line needs to be closed, and then the sampling voltage of the other two-phase sampling line with a normal operating state is converted into the corresponding sampling current, so that the fan can be restarted and run normally for different types of abnormalities.

[0081] In one embodiment, when there are at least two sampling lines with normal operating states, the operating phase currents and the target duty cycle corresponding to the three-phase sampling lines are determined according to the sampling voltage corresponding to the two-phase sampling line with a normal operating state, including:

[0082] When there are three sampling lines with normal operating states, the sampling windows corresponding to the three-phase sampling lines are obtained;

[0083] The sampling windows corresponding to the three-phase sampling lines are sorted in descending order of the corresponding sampling window lengths, and a window sorting result is obtained;

[0084] The operating phase currents corresponding to the three-phase sampling lines are determined according to the sampling voltage 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 status of the three-phase sampling circuits is 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 interval 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 each of the three-phase sampling circuits are sorted in descending order according to the corresponding duration of the sampling windows to obtain a window sorting result. The sampling voltages corresponding to the first two sampling circuits are selected from 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 for calculating the operating phase current based on the sampling voltages is the same as in the above 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 status of the sampling circuits where the three-phase sampling resistors are located according to the sampled voltages of the three-phase sampling resistors, the method further includes:

[0089] When there are at least two sampling lines with abnormal operating 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 the normal sampling line of one phase or the sampling voltage of the sampling line with three-phase operation abnormalities. 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 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 acquires the sampling voltage of the three-phase sampling resistor, if the acquired sampling voltage is not VDD / 2, 0 within the preset running period, it means that the three-phase sampling circuit is running normally, then the sampling voltage of the two phases with larger sampling window among the three phases is converted into the corresponding sampling current and used as the running phase current, and according to Ia + Ib + Ic = 0, the running phase current of the last phase can be calculated. According to the three-phase running phase current and the full value duty cycle, the fan can be restarted to realize normal operation of the fan.

[0093] If the acquired sampling voltage is VDD / 2, it is judged that the sampling circuit of the phase with VDD / 2 has an open circuit abnormality, then the number of sampling circuits with VDD / 2 is judged, if the number > 1, the damaged sampling circuits exceed two phases, and the three-phase current cannot be reconstructed, then a fault is reported and it is prompted that the sampling circuit is damaged. If the number = 1, the corresponding relay is closed, and the sampling voltage corresponding to the two normal circuits is converted into the corresponding running phase current, according to Ia + Ib + Ic = 0, the current of each phase can be calculated, and the maximum duty cycle is limited, and the fan is restarted.

[0094] If the acquired sampling voltage is 0, it is judged that the resistor circuit of the phase with 0 has a short circuit abnormality, then the number of sampling circuits with 0 is judged, if the number > 1, the damaged sampling circuits exceed two phases, and the three-phase current cannot be reconstructed, then a fault is reported and it is prompted that the sampling circuit is damaged. If the number = 1, the sampling voltage corresponding to the two normal circuits is converted into the corresponding running phase current, according to Ia + Ib + Ic = 0, the current of each phase can be calculated, and the fan is restarted.

[0095] Figure 2 and Figure 3 is a flowchart of the fan control method in an embodiment. It should be understood that although the steps in the flowchart of Figure 2 and Figure 3 are shown in a sequence following the arrows, these steps are not necessarily executed in the order shown by the arrows. Unless otherwise explicitly stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, Figure 2 and Figure 3 at least part of the steps can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or sub-steps or stages of other steps.

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

[0097] The acquisition module 310 is used to obtain the sampled voltage of the three-phase sampling resistor in the fan control circuit within a preset operating cycle when the fan control circuit is in an operating 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 numerical value of the sampled voltage.

[0098] A state judgment module 320 is configured to determine the operating state of the sampling circuit 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;

[0099] A calculation module 330 is configured to determine the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits according to the sampled 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 configured to control the normal operation of the fan based on the operating phase currents and target duty cycles 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 operating 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 operating 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 breaker 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 two sampling lines in normal operation are converted into corresponding sampling currents;

[0109] determining, according to the sampling currents of the two phases, operating phase currents respectively corresponding to the sampling lines of the three phases;

[0110] determining, as a target duty ratio, a preset duty ratio less than a full value duty ratio; and

[0111] In an embodiment, the computing module 330 is further configured to:

[0112] when there is one sampling line with an abnormal operating state of short circuit, converting the sampling voltages respectively corresponding to the two sampling lines with normal operating states into corresponding sampling currents; or

[0113] when there is one sampling line with an abnormal operating state of open circuit, determining the sampling line with an abnormal operating state as an abnormal line, and after closing a relay in the abnormal line, converting the sampling voltages respectively corresponding to the two sampling lines with normal operating states into corresponding sampling currents.

[0114] In an embodiment, the computing module 330 is further configured to:

[0115] when there are three sampling lines with normal operating states, obtaining sampling windows respectively corresponding to the sampling lines of the three phases;

[0116] sorting the sampling windows respectively corresponding to the sampling lines of the three phases in descending order of corresponding time lengths of the sampling windows to obtain a window sorting result;

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

[0118] determining, as a target duty ratio, a full value duty ratio.

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

[0120] when there are at least two sampling lines with abnormal operating states, outputting corresponding fault prompt information according to abnormal types of the sampling lines of the phases, wherein the abnormal types include short circuit abnormality and open circuit abnormality.

[0121] As Figure 5As 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, for storing computer programs;

[0123] The processor 711 is configured to implement the wind turbine control method provided by any one of the aforementioned 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 solution of the present application, and does not constitute a limitation on the air-conditioning equipment to which the solution of the present application is applied. The specific air-conditioning equipment may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[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 used in Figure 5 The memory of the air conditioning device can store various program modules that constitute the fan control device, such as Figure 4 The acquisition module 310, state determination 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 an operating state, and obtains the sampled voltages of the three-phase sampling resistors in the fan control circuit within a preset operating cycle. The air conditioning device can use the state judgment module 320 to determine the operating state of the sampling circuits where each sampling resistor is located based on the sampled voltages of the three-phase sampling resistors, wherein each sampling resistor is located in a different sampling circuit. The air conditioning device can use the calculation module 330 to determine the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits based on the sampled voltages corresponding to the two-phase sampling circuits with normal operating states when at least two sampling circuits are in a normal operating state. The air conditioning device can use the control module 340 to control the normal operation of the fan based on the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits.

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

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

[0129] Through the description of the above embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software and a general hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the relevant technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing an air conditioning device (which can be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or certain portions of the embodiments.

[0130] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only 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 "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence 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 to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative methods may be used.

[0131] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily 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 is not intended to be limited to the embodiments shown herein, but is intended to be accorded 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 an operating state, obtaining the sampled voltages of the three-phase sampling resistors in the fan control circuit within a preset operating cycle; 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; 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; Controlling the normal operation of the fan based on the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits; 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: When there are two sampling lines in normal operation, the sampling voltages corresponding to the two sampling lines in normal operation 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; When there are two sampling lines in normal operation, converting the sampling voltages corresponding to the two sampling lines in normal operation into corresponding sampling currents includes: When there is a sampling line with a short circuit abnormality, the sampling voltages corresponding to the sampling lines with two phases in normal operation are converted into corresponding sampling currents; 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 voltages corresponding to the sampling lines with two-phase normal operating states are converted into corresponding sampling currents.

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 operating 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 operating 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 operating 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 breaker 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, wherein 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 operating status, corresponding fault prompt information is output according to the abnormality type of the sampling line of each phase, wherein the abnormality type includes short circuit abnormality and open circuit abnormality.

5. A fan control device, characterized in that: The device comprises: An acquisition module, configured to acquire the sampled voltages of the three-phase sampling resistors in the fan control circuit within a preset operation cycle when the fan control circuit is in an operating state; A state judgment module, configured 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 for determining, 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 according to the sampling voltages corresponding to the two-phase sampling circuits in normal operation; A control module, configured to control the normal operation of the fan based on the operating phase currents and target duty cycles corresponding to the three-phase sampling circuits; The calculation module is also used for: When there are two sampling lines in normal operation, the sampling voltages corresponding to the two sampling lines in normal operation 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; When there are two sampling lines in normal operation, converting the sampling voltages corresponding to the two sampling lines in normal operation into corresponding sampling currents includes: When there is a sampling line with a short circuit abnormality, the sampling voltages corresponding to the sampling lines with two phases in normal operation are converted into corresponding sampling currents; 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 voltages corresponding to the sampling lines with two-phase normal operating states are converted into corresponding sampling currents.

6. A fan control circuit, characterized in that: The fan control circuit includes an intelligent power module, a three-phase sampling circuit and the fan control device according to claim 5 that are electrically connected to each other. The sampling circuit of each phase includes a sampling resistor, a current limiting resistor, a transistor, a relay, a freewheeling diode and a filter capacitor. 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.

7. An air conditioning device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 4 is implemented.

8. 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 4 is implemented.

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