Method and device for detecting abnormal power-on of fan

Abstract

Provided are a method and device for detecting power-on anomalies in a fan, belonging to the field of air conditioning technology. The device comprises a main chip, a DC bus capacitor, a power source, and a fan; the power source charges the DC bus capacitor; the DC bus capacitor supplies power to the fan via a DC line, and the DC bus capacitor is electrically connected to the main chip; the main chip provides a drive signal to the fan and receives a speed feedback pulse signal from the fan. The method and device for detecting power-on anomalies in a fan solve the problem of an air conditioner indoor unit automatically being powered on again abnormally after a power outage. This ensures that the air conditioner does not start abnormally when it is powered on normally, thereby improving the quality and safety of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a method and device for detecting power-on anomalies of a fan. Background Art

[0002] In an air conditioner indoor unit, when the crossflow blades are driven by an electric motor and the crossflow speed is high and the blades are large, after a power outage, the fan continues to run at high speed due to inertia, causing the motor to become a generator and charge the indoor unit's main board. This causes the indoor unit to be powered and enter an uncertain control state, which not only affects the user experience but also increases the cost and difficulty of after-sales repairs. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and device for detecting abnormal power-on of a fan. The present invention mainly solves the problem that the indoor unit of an air conditioner automatically regains power abnormally after power failure.

[0004] A method for detecting power-on anomalies, applied to a controller for controlling a fan, comprises:

[0005] Detecting that the controller is powered on, and obtaining a pulse signal fed back by the fan;

[0006] If the pulse signal fed back by the fan is not obtained, or the pulse width of the pulse signal is less than a preset width, sending a driving signal to the fan;

[0007] If the pulse width of the pulse signal is greater than or equal to a preset width, it is determined that a power-on abnormality occurs and sending a drive signal to the fan is prohibited.

[0008] Preferably, the method further comprises:

[0009] When it is detected that the controller is powered on, the first timing is started, and the pulse width of the pulse signal is obtained at a set time interval, and the state of the pulse valid flag is determined according to the pulse width, until the first timing duration reaches a first preset duration;

[0010] The state of the pulse valid flag is used to indicate the relationship between the pulse width and the preset width.

[0011] Preferably, determining the state of the pulse valid flag according to the pulse width includes:

[0012] If the pulse width is less than the preset width, it is determined that the state of the pulse valid flag is the first state; optionally, the first state can be identified by 0.

[0013] If the pulse width is greater than or equal to the preset width, the state of the pulse valid flag is determined to be the second state. Optionally, the second state can be identified by 1.

[0014] Preferably, if the pulse width of the pulse signal is greater than or equal to a preset width, determining that a power-on abnormality exists and prohibiting sending a drive signal to the fan includes:

[0015] If it is detected that the pulse width of the pulse signal is greater than or equal to the preset width, the second timing is started;

[0016] If the second timing duration reaches the second preset duration and the pulse width of the pulse signal is still greater than or equal to the preset width, sending the driving signal to the fan is prohibited;

[0017] If the second timing duration reaches the second preset duration and the pulse width of the pulse signal is less than the preset width, a driving signal is sent to the fan.

[0018] A method for detecting power-on anomalies of a fan comprises the following steps:

[0019] S1. The main chip is powered on and initialized. The main chip has a timer T1, which sets the pulse valid flag to the first state; optionally, the first state can be marked with 0;

[0020] S2, timer T1 starts timing;

[0021] S21. If the timing time of timer T1 has not expired, the main chip judges or detects the width time of the fan feedback pulse signal every preset interruption time T2. If it is detected that the fan feedback pulse width time is greater than the pulse width time T4, the pulse valid flag is set to the second state, otherwise the timer T1 continues to time; optionally, the second state can be identified by 1.

[0022] S22: If the timer T1 is up, the main chip determines whether the pulse valid flag is equal to the second state;

[0023] S3. If the pulse valid flag is equal to the second state, it is determined that the fan power-on is abnormal.

[0024] A method for controlling an air conditioner fan comprises the following steps:

[0025] S1. Power on and initialize the main chip. The main chip has a timer T1 and a timer T3. The pulse valid flag is set to the first state. Optionally, the first state can be marked as 0.

[0026] S2, timer T1 starts timing;

[0027] S21. If the timing time of timer T1 has not expired, the main chip judges or detects the width time of the fan feedback pulse signal every preset interruption time T2. If it is detected that the fan feedback pulse width time is greater than the pulse width time T4, the pulse valid flag is set to the second state, otherwise the timer T1 continues to time; optionally, the second state can be identified by 1.

[0028] S22: If the timer T1 is up, the main chip determines whether the pulse valid flag is equal to the second state;

[0029] S3, if the pulse valid flag is equal to the second state, then start timer T3, if the timer T3 has not expired, then timer T3 continues to time, if the timer T3 expires, then the main chip starts the air conditioning program to run;

[0030] S4. If the pulse valid flag is equal to the first state, the main chip starts the air conditioning program.

[0031] A power-on anomaly detection device includes a main chip, a DC bus capacitor, a power source, and a fan;

[0032] The power source charges the DC bus capacitor;

[0033] The DC bus capacitor supplies power to the fan through a DC line, and the DC bus capacitor is electrically connected to the main chip;

[0034] The main chip provides a driving signal to the fan and receives a speed feedback pulse signal of the fan;

[0035] When the power source supplies power to the main chip, the main chip is in working mode;

[0036] When the fan is stationary and the power source stops supplying power to the main chip, the main chip is in stop mode;

[0037] When the fan rotates by inertia and the power source stops supplying power to the main chip, the fan charges the DC bus capacitor, the main chip is in working mode for a short time, and the main chip detects the fan feedback pulse width to perform power-on abnormality detection.

[0038] Preferably, it also includes a VSP drive circuit, the main chip sends a drive signal to the VSP drive circuit, and the VSP drive circuit uses the PWM drive signal to control the fan speed; it also includes a rectifier module and a power supply module, the power source charges the DC bus capacitor through the rectifier module; the DC bus capacitor is electrically connected to the power supply module through the DC bus, and the power supply module is electrically connected to the main chip.

[0039] An air conditioner includes a fan power-on anomaly detection device, a power-on anomaly detection method, a fan power-on anomaly detection method, or an air conditioner fan control method, wherein the air conditioner fan blade is a cross-flow fan blade.

[0040] Beneficial technical effects:

[0041] Ensure that the air conditioner does not start abnormally when it receives power normally, improve the quality and safety of the air conditioner, and ensure user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0043] Figure 1 This is the system diagram of the air conditioner fan power-on abnormality detection device.

[0044] Figure 2 This is a flow chart of the power-on and power-off process.

[0045] Figure 3 The figure is a flow chart of the method for detecting abnormal power-on of a fan. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0048] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] Example 1

[0050] A method and device for detecting power-on anomalies in a fan. This embodiment is applied to an air conditioner containing an electric motor composed of a fan, and the electric motor has large inertia (large mass, high operating speed) or other electrical appliances with similar characteristics, so that abnormal power generation during inertial operation after the motor of the air conditioner loses power will not cause abnormal operation of the equipment.

[0051] like Figure 1 The power source is charged by the rectifier module through the neutral line and the live line of the power line to the DC bus capacitor. The DC bus capacitor is electrically connected to the power module through the DC bus. When the DC bus voltage VDC is higher than the preset voltage, the power module starts working and outputs the drive voltage VCC to power the main chip. In addition, the DC bus provides DC power to the fan through the cable. The rated speed of the fan is W revolutions per minute. W can be a value of 800-3000, for example. The fan converts its speed into a speed feedback pulse (nW / minute) through a Hall sensor, an encoder or a photoelectric converter and feeds it back to the main chip, where n is an integer.

[0052] The DC bus capacitor supplies power to the fan and the main chip through different circuits. The port for the main chip to receive speed feedback is different from the port for driving the fan.

[0053] The main chip is electrically connected to the display, buzzer, air deflector and other loads. In addition, the main chip sends a PWM drive signal to a VSP (voltage speed control) drive circuit, and the VSP drive circuit uses the PWM drive signal to control the speed of the fan.

[0054] like Figure 2 As shown in the figure, when the user cuts off the power supply or the power is tripped or the power is lost, the neutral and live wires lose power. At this time, the following two situations will occur:

[0055] Case 1: Under normal circumstances, the DC bus capacitor loses power, the DC bus voltage VDC drops, the power module stops working, the drive voltage VCC loses power, and the main chip stops working.

[0056] Case 2: Under abnormal circumstances, if the inertia of the fan blades driven by the motor or fan is large or the mass of the cross-flow fan blades is large, and the running speed is high, then the running speed is high during the process of the fan blades stopping, and it takes a long time for the speed to drop to zero and stop. During the power-off and speed-down process of the fan, it changes from the motor state to the generator state, and can charge the DC bus capacitor with the power generated in the generator state through the power supply cable. When the DC bus voltage VDC is higher than the preset voltage, the working conditions of the power module are met, so that the power module works and outputs the driving voltage VCC to enable the main chip to be powered and run; however, in case 2, after the fan speed drops to zero, the fan exits the generator state, and the main chip loses power and stops working. That is, in case 2, the main chip is only abnormally energized for a short time, and does not meet the continuous operation conditions. The main chip also does not meet the requirements of driving the air conditioner to run according to the preset program.

[0057] Furthermore, the above-mentioned situation 2 is an abnormal power supply, which does not meet the user's wishes, and the abnormal startup and operation state is uncertain. In situation 2, the air conditioner may be driven for a short time by the main chip, and the device may be driven to an unset position for a short time, which may pose a safety hazard or damage the device. Therefore, a method and program are needed to distinguish whether the air conditioner program is in situation 1 or situation 2 when it is started. Because in situation 1, the main chip loses power; while in situation 2, the fan slows down to generate electricity to drive the main chip to be powered, and the program can detect that the duration of the fan rotation is not long. Since the fan inertia slows down the running time itself is not long, the duration of the electric energy generated by the fan slowing down to reach the working level of the power module is not long. Therefore, whether it is abnormal power-on can be determined by whether a valid fan pulse can be detected during power-on.

[0058] like Figure 3 As shown, Figure 3 The timer parameters in the flowchart are explained as follows: Timer T1: Detects the duration of the fan pulse. The T1 time value can be set to a first preset time, specifically 100ms, 200ms, or 100-300ms, and can be increased or decreased based on actual application. If timer T1 is too long, the air conditioning system's response time will increase, thus affecting normal function execution and user experience and satisfaction. If timer T1 is too short, valid pulses may not be detected. Therefore, the timer T1 value should be adjusted based on the actual circuit and load conditions.

[0059] Interrupt Time T2: The interrupt time for detecting pulse width. Interrupt Time T2 can be set to a second preset time and can be specifically set to 0.1ms, 0.2ms, or 0.1-0.3ms. It can also be increased or decreased based on actual application. If Interrupt Time T2 is too large, the pulse width detection accuracy will be insufficient, resulting in inaccurate counting. If Interrupt Time T2 is too small, program execution efficiency will be affected.

[0060] Timer T3: After detecting the pulse signal of a predetermined pulse width fed back by the fan, it is determined that the method or program delays the start time when the fan is abnormal. The time value of timer T3 can be set to the third preset time and specifically taken as 1S or 1-3S. It can also be increased or decreased according to actual application to avoid the time when the fan speed decays to zero. If the timer T3 time is too long, the response time of the air-conditioning system will be increased, thereby increasing the normal function execution and affecting the user experience and satisfaction; if the timer T3 time is too short, the fan may not have stopped yet and thus failed to avoid the time when the fan speed decays to zero.

[0061] Pulse width time T4: Speed ​​feedback effective pulse width threshold preset time, pulse width time T4 time constant value can be set to the fourth preset time and specifically taken as 1.2ms or 1.2-1.8ms, and can also be increased or decreased according to actual application.

[0062] Timers T1 and T3 are both timers in the main chip.

[0063] A method for detecting abnormal power-on of a fan, applied to an air conditioner, comprises the following steps:

[0064] S1. The main chip of the air conditioner is powered on and initialized. The main chip sets the fan PWM drive signal to invalid and the pulse valid flag to 0 to ensure that the fan is in a static state when the main chip is normally powered. Thus, the fan state is cleared to zero by setting the fan PWM drive signal to invalid;

[0065] S2, timer T1 starts timing;

[0066] S21. If timer T1 has not expired, the main chip determines or detects the width of the fan feedback pulse signal every preset interruption time T2. If it is detected that the fan feedback pulse width is greater than the pulse width time T4, the pulse valid flag is set to 1. Otherwise, timer T1 continues to count. At this time, it is considered that a valid fan feedback pulse is detected, that is, the fan is in the running state. At this time, the main chip has just been powered on and has not sent a drive signal to the fan. Therefore, the fan is in the abnormal state under situation 2. Therefore, it is judged that the air conditioner may be short-term power supply to the device due to the inertia of the fan.

[0067] S22: If the timer T1 reaches the end of the time, the main chip determines whether the pulse valid flag is equal to 1;

[0068] S3, if the pulse valid flag is equal to 1, then start timer T3, if the timer T3 timing time has not expired, then timer T3 continues to timing, if the timer T3 timing time expires, then the main chip of the air conditioner starts the program to run;

[0069] If the pulse valid flag is equal to 1, it means that the fan is running abnormally, and timer T3 is started. When timer T3 is set to expire, if the capacitor is charged by the inertia of the fan deceleration, the timer T1 plus timer T3 cannot be run for such a long time. Therefore, the fact that timer T3 is set to expire proves that the mainboard is powered normally at this time, and the main chip startup program logic is normal.

[0070] S4. If the pulse valid flag is equal to 0, the main chip startup program of the air conditioner runs normally;

[0071] If the pulse valid flag is equal to 0, it is considered that the fan status is normal and in a stationary state, and the pulse valid flag is not changed. This is a normal power-on. The air conditioner main chip can start the air conditioner immediately without further eliminating the abnormality through the timer T3 delay. The normal logic processing of the air conditioner program starts directly.

[0072] Example 2

[0073] Based on the first embodiment of the present invention, the following improvements are made:

[0074] The present application does not limit the setting time of timer T1 and timer T3. The present application utilizes the sum of the timing times of timer T1 and timer T3 to avoid the time value from the air-conditioning fan being powered off to the speed being reduced to zero. Therefore, the timer T1 and timer T3 of the present application can be adjusted according to the product models of different fans. For example, if the time value from the air-conditioning fan being powered off to the speed being reduced to zero is 1S, then the sum of the timing times of timer T1 and timer T3 can be greater than 1S and specifically be 1.1S or 1.2S; if the time value from the air-conditioning fan being powered off to the speed being reduced to zero is 2S, then the sum of the timing times of timer T1 and timer T3 can be greater than 2S and specifically be 2.1S. or 2.2S; if the time value from power off to zero speed of the air conditioner fan is 3S, the sum of the timing times of timer T1 and timer T3 can be greater than 3S and specifically 3.1S or 3.2S; if the time value from power off to zero speed of the air conditioner fan is m seconds, where m is a number greater than 0, the sum of the timing times of timer T1 and timer T3 can be greater than m seconds and specifically 1.05m seconds, 1.1m seconds, 1.15m seconds, 1.2m seconds, 1.25m seconds, 1.3m seconds, 1.35m seconds, 1.4m seconds, 1.45m seconds, 1.5m seconds, 1.55m seconds, 1.6m seconds, 1.65m seconds, 1.7m seconds, or 1.75m seconds;

[0075] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0076] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0077] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0078] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0079] It should be noted that the serial numbers of the embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for detecting abnormalities in fan power-on, comprising the following steps: S1, the main chip is powered on and initialized. The main chip has a timer T1, which sets the pulse valid flag to the first state; S2, timer T1 starts timing; S21, if the timer T1 has not expired, the main chip determines or detects the width of the fan feedback pulse signal every preset interruption time T2. If it is detected that the fan feedback pulse width time is greater than the pulse width time T4, the pulse valid flag is set to the second state. Otherwise, the timer T1 continues to count. S22: If the timer T1 is up, the main chip determines whether the pulse valid flag is equal to the second state; S3. If the pulse valid flag is equal to the second state, it is determined that the fan power-on is abnormal.

2. A method for controlling an air conditioner fan, comprising the following steps: S1, the main chip is powered on and initialized. The main chip has timers T1 and T3, and sets the pulse valid flag to the first state; S2, timer T1 starts timing; S21, if the timer T1 has not expired, the main chip determines or detects the width of the fan feedback pulse signal every preset interruption time T2. If it is detected that the fan feedback pulse width time is greater than the pulse width time T4, the pulse valid flag is set to the second state. Otherwise, the timer T1 continues to count. S22: If the timer T1 is up, the main chip determines whether the pulse valid flag is equal to the second state; S3, if the pulse valid flag is equal to the second state, then start timer T3, if the timer T3 has not expired, then timer T3 continues to time, if the timer T3 expires, then the main chip starts the air conditioning program to run; S4. If the pulse valid flag is equal to the first state, the main chip starts the air conditioning program.

3. A power-on anomaly detection device, characterized in that: Including main chip, DC bus capacitor, power source and fan; The power source charges the DC bus capacitor; The DC bus capacitor supplies power to the fan through a DC line, and the DC bus capacitor is electrically connected to the main chip; The main chip provides a driving signal to the fan and receives a speed feedback pulse signal of the fan; When the power source supplies power to the main chip, the main chip is in working mode; When the fan is stationary and the power source stops supplying power to the main chip, the main chip is in stop mode; When the fan rotates by inertia and the power source stops supplying power to the main chip, the fan charges the DC bus capacitor, the main chip is in working mode for a short time, and the main chip detects the fan feedback pulse width to perform power-on abnormality detection; The main chip performs the power-on abnormality detection using the method according to claim 1 or 2.

4. The power-on anomaly detection device according to claim 3, characterized in that: It also includes a VSP drive circuit, the main chip sends a drive signal to the VSP drive circuit, and the VSP drive circuit uses the PWM drive signal to control the fan speed; it also includes a rectifier module and a power supply module, the power source charges the DC bus capacitor through the rectifier module; the DC bus capacitor is electrically connected to the power supply module through the DC bus, and the power supply module is electrically connected to the main chip.

5. An air conditioner comprising the power-on anomaly detection device according to any one of claims 3 to 4 or employing the method according to any one of claims 1 to 2.

6. An air conditioner as claimed in claim 5, wherein the fan blades are cross-flow fan blades.

Images