WO2018058956A1 - Procédé et dispositif de commande de moteur électrique à courant alternatif, et climatiseur - Google Patents

Procédé et dispositif de commande de moteur électrique à courant alternatif, et climatiseur Download PDF

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Publication number
WO2018058956A1
WO2018058956A1 PCT/CN2017/082516 CN2017082516W WO2018058956A1 WO 2018058956 A1 WO2018058956 A1 WO 2018058956A1 CN 2017082516 W CN2017082516 W CN 2017082516W WO 2018058956 A1 WO2018058956 A1 WO 2018058956A1
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WIPO (PCT)
Prior art keywords
current
pulse signal
driving pulse
point
motor
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PCT/CN2017/082516
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English (en)
Chinese (zh)
Inventor
李洪涛
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广东美的制冷设备有限公司
美的集团股份有限公司
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Publication of WO2018058956A1 publication Critical patent/WO2018058956A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting

Definitions

  • the invention relates to the field of motor control, and in particular to a control method and device for an AC motor and an air conditioner.
  • the speed regulation of the AC asynchronous motor currently used can be realized by adjusting the conduction angle of the motor driving power device such as the thyristor, such as the PG speed motor control in the air conditioner field, as shown in Fig. 1, the AC mains signal
  • the zero-crossing detection circuit is input to the MCU, and the MCU output driving pulse drives the operation of the PG motor through the thyristor-based driving circuit, and the PG motor outputs the rotational speed feedback signal to the MCU, and the MCU controls the pulse width of the driving signal relative to the zero-crossing signal. Control the conduction angle of silicon, and then control the AC voltage value of the AC mains loaded on the PG motor to realize the speed regulation of the PG motor.
  • the thyristor Since the thyristor requires a certain current when the thyristor is turned on when the voltage is applied to the G-electrode, and the current-limiting resistor R6 of the 12V terminal that supplies the voltage to the G-pole also has a heat loss, the thyristor G-pole is turned on.
  • the voltage should not be too long. Due to the inductance characteristics of the winding coil inside the motor, the phase of the AC voltage and the AC current signal loaded on the motor are inconsistent. As shown in Figure 2, when the AC voltage is applied to the motor, the phase of the current passing through the motor will lag.
  • the corresponding AC current signal has zero crossing at C1, that is, the two moments are not simultaneous, when the speed of the PG motor is relatively high or the motor
  • the start-up process when the starting point of the pulse width of the driving pulse output by the MCU is close to the voltage zero-crossing signal, the end point of the pulse appears before the corresponding current zero-crossing point, which starts from the starting point of the driving pulse.
  • the thyristor is turned on, but the thyristor is turned off at the current zero crossing point C1. Thereafter, the thyristor is turned off during the entire AC voltage zero-crossing period, while the thyristor is turned on during the normal state.
  • the thyristor begins to conduct when there is a drive pulse, as shown in Figure 2, the first pulse of the motor drive signal
  • the thyristor is turned on, and the voltage is applied to the PG motor corresponding to the effective voltage C2 of the motor input end, and the PG motor
  • the motor starts to run.
  • the current zero-crossing signal reaches the point C1
  • the current can be turned off because the current crosses zero.
  • the thyristor Since the driving pulse is turned off before the time C1, the current zero-crossing signal At the beginning of the entire AC voltage zero-crossing period, the thyristor is in the off state. As shown in the figure, the effective voltage of the effective voltage of the motor input terminal from the C2 to C3 line is zero. Normally, the effective voltage value should always exist. This causes an unexpected shutdown of the thyristor, causing frequent jitters in the motor at start-up or high-speed operation, and does not reach normal speed.
  • the main object of the present invention is to provide a control method, device and air conditioner based on an AC motor control circuit, and aim to solve the problem that the triggering start point of the driving pulse signal in the prior art is earlier than the AC current corresponding to the current AC input voltage period.
  • the motor drive power device is turned off due to the alternating current signal, which causes the AC motor to frequently jitter during startup or high-speed operation and the operation is unstable.
  • the present invention provides a control method based on an AC motor control circuit, and the control method based on the AC motor control circuit includes the following steps:
  • the step of adjusting a trigger starting point of the current driving pulse signal according to the target rotational speed and the real-time rotational speed feedback signal, and controlling an end point of the current driving pulse signal after the alternating current zero-crossing time comprises:
  • Adjusting a trigger starting point of the current driving pulse signal according to the target rotating speed and the real-time speed feedback signal, and the pulse width of the current driving pulse signal is a preset first pulse width value, so that the end point of the current driving pulse signal is The alternating current is after the zero crossing time.
  • the step of adjusting a trigger starting point of the current driving pulse signal according to the target rotational speed and the real-time rotational speed feedback signal, and controlling an end point of the current driving pulse signal after the alternating current zero-crossing time comprises:
  • the pulse width of the current drive pulse signal is controlled as the time difference between the trigger start point and the time of the next voltage zero crossing.
  • the step of adjusting a trigger starting point of the current driving pulse signal according to the target rotational speed and the real-time rotational speed feedback signal, and controlling an end point of the current driving pulse signal after the alternating current zero-crossing time comprises:
  • the triggering start point of the driving pulse signal is earlier than the current zero crossing point corresponding to the current AC input voltage period, and the end point of the driving pulse signal is controlled at the moment of the alternating current zero crossing point.
  • the following steps include:
  • the pulse width of the current drive pulse signal is adjusted such that the end point of the drive pulse signal is after the moment of the AC current zero crossing.
  • the step of adjusting a trigger starting point of the current driving pulse signal according to the target rotational speed and the real-time rotational speed feedback signal, and controlling the end point of the current driving pulse signal after the alternating current zero-crossing time includes:
  • the pulse width of the current driving pulse signal is controlled to be a preset second pulse width when it is determined that the triggering start point of the driving pulse signal is later than the current zero crossing point corresponding to the current AC input voltage period.
  • the triggering start point of the driving pulse signal is earlier than the current zero crossing point corresponding to the current AC input voltage period, and the end point of the driving pulse signal is controlled at the moment of the alternating current zero crossing point.
  • the following steps include:
  • the triggering start point of the driving pulse signal is earlier than the current zero crossing point corresponding to the current AC input voltage period, and the ending point of the driving pulse signal is controlled at the alternating current zero crossing point.
  • the steps after the moment include:
  • the pulse width of the current drive pulse signal is controlled as the time difference between the trigger start point and the time of the next voltage zero crossing.
  • the step of adjusting a trigger starting point of the current driving pulse signal according to the target rotational speed and the real-time rotational speed feedback signal, and controlling the end point of the current driving pulse signal after the alternating current zero-crossing time includes:
  • the present invention further provides a control device based on an AC motor control circuit, and the control device based on the AC motor control circuit includes:
  • a detecting module configured to detect a zero-crossing signal of an input voltage of the AC motor control circuit and a real-time speed feedback signal of the AC motor;
  • control module configured to adjust a trigger starting point of the current driving pulse signal according to the target rotating speed and the real-time speed feedback signal, and control an ending point of the current driving pulse signal after the moment of the alternating current zero-crossing point; wherein the driving The pulse signal drives the AC motor to reach the target speed.
  • control module is further configured to:
  • Adjusting a trigger starting point of the current driving pulse signal according to the target rotating speed and the real-time speed feedback signal, and the pulse width of the current driving pulse signal is a preset first pulse width value, so that the end point of the current driving pulse signal is The alternating current is after the zero crossing time.
  • control module is further configured to:
  • the pulse width of the current drive pulse signal is controlled as the time difference between the trigger start point and the time of the next voltage zero crossing.
  • control module is further configured to:
  • control module is further configured to:
  • the pulse width of the current drive pulse signal is adjusted such that the end point of the drive pulse signal is after the moment of the AC current zero crossing.
  • control module is further configured to:
  • the pulse width of the current driving pulse signal is controlled to be a preset second pulse width when it is determined that the triggering start point of the driving pulse signal is later than the current zero crossing point corresponding to the current AC input voltage period.
  • control module is further configured to:
  • control module is further configured to:
  • the pulse width of the current drive pulse signal is controlled as the time difference between the trigger start point and the time of the next voltage zero crossing.
  • control module is further configured to:
  • the present invention also provides an air conditioner comprising the above-described control device based on an AC motor control circuit.
  • the AC motor control circuit of the invention obtains the target rotational speed of the device, detects the zero-crossing signal of the input voltage of the AC motor control circuit and the rotational speed feedback signal of the AC motor through the relevant circuit, and the MCU in the AC drive circuit is based on the zero-crossing signal and the rotational speed.
  • the feedback signal outputs a driving pulse signal, and adjusts a trigger starting point of the current driving pulse signal according to the target rotating speed and the real-time speed feedback signal output, and controls an end point of the driving pulse signal to be resolved after the alternating current zero-crossing point
  • the motor is driven by the thyristor or the like in the driving circuit when the current zero crossing point occurs.
  • the power device is turned off and causes abnormal speed and jitter of the AC motor to ensure stable and reliable operation of the AC motor.
  • FIG. 1 is a structural diagram of an AC motor control circuit according to the prior art
  • FIG. 2 is a waveform diagram of a control circuit of an alternating current motor according to the prior art
  • FIG. 3 is a schematic flow chart of a first embodiment of a control method based on an AC motor control circuit according to the present invention
  • FIG. 4 is a waveform diagram of an AC motor control circuit according to first and third embodiments of a control method of an AC motor control circuit according to the present invention
  • FIG. 5 is a waveform diagram of an AC motor control circuit according to second and seventh embodiments of a control method of an AC motor control circuit according to the present invention
  • FIG. 6 is a waveform diagram of another AC motor control circuit according to a fourth embodiment of the control method of the AC motor control circuit of the present invention.
  • FIG. 7 is a waveform diagram of an AC motor control circuit according to fifth and sixth embodiments of a control method of an AC motor control circuit according to the present invention.
  • FIG. 8 is a waveform diagram of an AC motor control circuit according to an eighth embodiment of a control method of an AC motor control circuit according to the present invention.
  • FIG. 9 is a schematic diagram of functional modules of a control device based on an AC motor control circuit of the present invention.
  • FIG. 3 is a flow chart of a control method based on an AC motor control circuit in accordance with a first embodiment of the present invention. As shown in FIG. 3, the control method based on the AC motor control circuit of the embodiment of the present invention includes the following steps:
  • step S10 the target rotational speed of the AC motor is obtained.
  • the target speed is generally obtained by the AC motor control circuit from the device in which it is located.
  • the AC motor control circuit is used for driving the motor of the air conditioner, and the air conditioner obtains the current wind speed gear or wind speed level set by the user, and the MCU passes again.
  • the memory retrieves the target speed value corresponding to the wind speed gear position or the wind speed level, so that the current target speed is obtained.
  • Step S20 detecting a zero-crossing signal of an input voltage of the AC motor control circuit and a real-time speed feedback signal of the AC motor;
  • the AC motor control circuit realizes the zero-crossing signal detection of the AC input voltage through the A-part circuit in the figure.
  • the zero-crossing detection is mainly implemented based on the optocoupler IC1, and is input to the P1 port of the MCU after being shaped by the transistor Q1.
  • the AC voltage zero-crossing signal waveform as shown in FIG. 2 is obtained at the P1 port, and the B portion of FIG. 1 detects the AC motor speed feedback signal and is input to the P3 port of the MCU for detection.
  • Step S30 outputting a trigger start point of the current driving pulse signal according to the target rotation speed and the real-time rotation speed feedback signal output, and controlling an end point of the current driving pulse signal after the time of the alternating current zero-crossing point; wherein the driving pulse The signal drives the AC motor to reach a target speed.
  • the MCU obtains the target speed value. If the user sets the air conditioner to the low wind position, the MCU obtains the low wind position of 800 rpm by taking the memory data table, and further according to the time of the zero-crossing signal, the zero-crossing signal.
  • the initial relative time point gives the initial motor drive pulse signal, as shown in Figure 4 at C3, the motor drive pulse signal is combined with the current motor speed feedback signal to adjust the trigger pulse position of the drive pulse signal after the zero-crossing signal. To adjust the speed of the motor to reach the target speed value.
  • the real-time rotational speed feedback signal of the motor drive circuit obtains the current real-time rotational speed, and adjusts the trigger starting point of the current driving pulse signal according to the target rotational speed value, and the trigger starting point of adjusting the current driving pulse signal as shown in the figure is C3.
  • the first zero-crossing signal of the current at the full voltage of the motor is C1, which is later than the first zero-crossing signal 0 of the AC input voltage.
  • the MCU outputs the pulse signal
  • the end point of the output pulse signal is controlled.
  • the end point of the control drive pulse signal in the figure is C4, which is located after C1.
  • the end point C4 of the driving pulse signal is located after the current zero-crossing point C1, it is ensured that when the current of the alternating current motor crosses the zero time C1, there is still a driving pulse signal, which ensures that the thyristor can still be continuously turned on and does not turn off, so that The effective voltage is still loaded on the AC motor, that is, the effective voltage is still loaded at the time of C1 to C5 in the figure, which ensures that the AC motor can be continuously loaded from the trigger starting point C3 of the pulse signal until the end of the AC voltage zero-crossing period.
  • the voltage avoids the prior art in which the AC motor is turned off due to the current zero-crossing point, and the motor drive power device such as the thyristor is turned off, so that the subsequent AC voltage zero-crossing period cannot load the effective voltage, causing the motor speed to be unstable. An anomaly of jitter has occurred.
  • the current signal of the AC motor in the figure is the current signal when the full voltage is loaded thereon, that is, the AC motor is always loaded continuously during the entire period of the AC voltage, usually When the motor speed is maximum, the current signal of the motor also exists in all cycles.
  • the phase difference between the two can be clearly displayed through multiple zero-crossing points. Of course, it can also be displayed by the current signal of the current motor speed. If the motor is not fully loaded, the current signal must be discontinuous. If you want to show the comparison between its zero-crossing point and the zero-crossing of the AC input voltage, it is not convenient to compare.
  • the phase difference between the voltage and current phases is usually different.
  • the voltage and current of the specific type of motor used are different.
  • the time difference parameter of zero point can be easily obtained in the test, generally a range value, and the maximum value of the range value can be taken as the time difference parameter.
  • the MCU drives the pulse signal to drive the AC motor to reach the target speed through the above control, specifically: the MCU outputs the driving pulse signal to the AC motor driving circuit, and the driving circuit converts according to the driving pulse according to the AC input voltage, and is loaded in the AC motor.
  • the power input terminal realizes the normal operation of the motor.
  • the MCU outputs the driving pulse signal through the P2 port.
  • the motor driving circuit is mainly composed of the motor driving power device. As shown in the figure, the thyristor TR1 and the MCU output the driving pulse signal pass through the triode.
  • the Q2 controls the optocoupler IC3, and the optocoupler IC3 triggers the G-stage of the thyristor according to the pulse signal, so that the thyristor is turned on, when the starting point of the control drive pulse signal is at different times in the AC voltage zero-crossing period
  • the conduction angle of the thyristor is different, which results in different AC currents passing through the thyristor from this week. Therefore, the RMS value of the AC voltage applied to the AC motor is different, thereby changing the rotation speed of the motor and further combining the AC motor.
  • the real-time speed feedback signal determines whether the current speed is the same as the target speed. When the speed is different, the target speed is finally reached by changing the conduction angle of the thyristor.
  • the AC motor control circuit detects the zero-speed signal of the input voltage of the AC motor control circuit and the speed feedback signal of the AC motor through the relevant circuit by acquiring the target rotational speed of the device, and the MCU in the AC drive circuit is based on the zero-crossing signal.
  • the speed feedback signal outputs a driving pulse signal, and adjusts a trigger starting point of the current driving pulse signal according to the target speed and the real-time speed feedback signal output, and controls an end point of the driving pulse signal after the alternating current zero-crossing point
  • the driving pulse signal of the AC motor control circuit when the driving pulse signal of the AC motor control circuit is in the above situation, the power device driven by the motor such as the thyristor in the driving circuit occurs when the current zero crossing point occurs.
  • the abnormal problem of unstable speed and jitter caused by the operation of the AC motor is closed, which ensures the smooth and reliable normal operation of the AC motor.
  • the current adjustment is performed according to the target rotation speed and the real-time rotation speed feedback signal.
  • Driving a triggering start point of the pulse signal, and the pulse width of the current driving pulse signal is a preset first pulse width value, so that the end point of the driving pulse signal is after the moment of the alternating current zero crossing point, that is, controlling the current
  • the pulse width of the drive pulse signal is a preset fixed pulse width value.
  • the pulse width of the motor drive pulse signal is a fixed value, as shown in the figure, the trigger start point C3 of the first motor drive pulse signal, and the end point is C4, which is located after the zero crossing point C1 of the AC motor, and its pulse width.
  • the first pulse width value T1 between C3 and C4, the pulse width of the other driving pulse signals is the first pulse width value, and the MCU controls the output pulse width because the pulse width of the driving pulse signal is a fixed first pulse width value.
  • the time is relatively simple, and can further reliably ensure that the motor drive power device of the AC motor control circuit, such as the thyristor, can be continuously turned on after the AC current zero crossing point, thereby ensuring the normal operation of the motor.
  • the first pulse width is The value range is 1 ⁇ T1 ⁇ 8ms.
  • the end point of controlling the driving pulse signal may further subdivide the control.
  • the next voltage zero-crossing point is further acquired, and the pulse width of the current driving pulse signal is controlled to be the trigger starting point. The time difference between the moments of the next voltage zero crossing.
  • the trigger starting point C3 of the first motor driving pulse signal of the specific drawing is located in the current alternating voltage period.
  • the end point of the MCU control motor drive pulse signal is the next voltage zero-crossing point, that is, C5 time, that is, the motor drive pulse signal starts from the trigger start point until the current AC voltage zero-crossing period.
  • the triggering of the driving pulse signal is determined.
  • the end point of the driving pulse signal is controlled after the AC current zero-crossing time; the AC motor is driven to reach the target according to the driving pulse signal Rotating speed.
  • the first zero-crossing signal of the current at the full voltage of the motor is C1, which is later than the first zero-crossing signal 0 of the AC input voltage.
  • the MCU outputs the pulse signal according to the above S30 step, It is judged whether the trigger starting point of the pulse signal is before the time C1, and if it is before, the end point of the control output pulse signal is after the time C1, that is, the trigger starting point of the motor driving pulse signal in the figure is C3, before the time C1, Then, the end point of the control drive pulse signal is C4, which is located after C1.
  • the end point C4 of the driving pulse signal is located after the current zero-crossing point C1, it is ensured that when the current of the alternating current motor crosses the zero time C1, there is still a driving pulse signal, which ensures that the thyristor can still be continuously turned on and does not turn off, so that The effective voltage is still loaded on the AC motor, that is, the effective voltage is still loaded at the time of C1 to C5 in the figure, which ensures that the AC motor can be continuously loaded from the trigger starting point C3 of the pulse signal until the end of the AC voltage zero-crossing period.
  • the voltage avoids the prior art in which the AC motor is turned off due to the current zero-crossing point, and the motor drive power device such as the thyristor is turned off, so that the subsequent AC voltage zero-crossing period cannot load the effective voltage, causing the motor speed to be unstable. An anomaly of jitter has occurred.
  • the triggering of the driving pulse signal is determined.
  • the starting point is earlier than the AC current zero-crossing point corresponding to the AC input voltage period, the AC current zero-crossing point corresponding to the AC input voltage period is obtained;
  • the pulse width of the current drive pulse signal is adjusted such that the end point of the drive pulse signal is after the moment of the AC current zero crossing.
  • the MCU determines that the triggering start time of the driving pulse signal is earlier than the current zero crossing point of the current AC motor, the AC current zero crossing point corresponding to the current AC input voltage period is acquired, and the current adjustment is adjusted.
  • the pulse width of the drive pulse signal that is, the pulse width of its drive pulse signal, can be varied. Since the target speed of the AC motor is different, the triggering start point of the pulse signal will be different when the MCU outputs the driving pulse signal according to the target speed and the real-time speed feedback signal, and the triggering start point time of the driving pulse signal is earlier than the current AC motor.
  • the motor drive power device When the current crosses the zero point, in order to ensure that the motor drive power device can be continuously turned on and not turned off at the time of the zero crossing of the AC motor, it is necessary to control the end point of the driving pulse signal after the moment of the AC current zero crossing. Specifically, as long as the end point is at a fixed time of a small preset time difference after the zero-crossing point of the alternating current, that is, as long as the motor-driven power device can be continuously turned on at the zero-crossing point of the alternating current, The triggering start point of the drive pulse signal is variable, and the end time is fixed, so the pulse width of the drive pulse is variable. Specifically, as shown in FIG.
  • the start point of the trigger of the first drive pulse to the third drive pulse of the motor drive signal is different, and the end point of the pulse is a fixed time, after each current zero-crossing time, therefore
  • the pulse width is different.
  • the triggering starting point of the driving pulse gradually approaches the voltage zero-crossing point in the current week, such as
  • the trigger starting point of the first to third pulses in the figure is gradually closer to the first zero-crossing point of the AC input voltage, so that the pulse width of the driving pulse is gradually longer, and each pulse width is different, that is, the pulse in the figure
  • the processing scheme can ensure that the pulse width of the driving pulse is as narrow as possible when the current driving device of the AC motor is continuously turned on, and the loss current of the power device is further reduced.
  • the driving pulse signal is determined.
  • the pulse width of the current driving pulse signal is controlled to be a preset second pulse width.
  • the MCU determines that the triggering start point of the driving pulse signal is later than the AC current zero-crossing point corresponding to the current AC input voltage period
  • the MCU controls the pulse width of the driving pulse signal to change to the second pulse width, that is,
  • the fixed time value is as shown in FIG. 7 based on the third embodiment.
  • the pulse pulse width is adjusted to a fixed time value, and the pulse is adjusted.
  • the width is a fixed time value T5, or as shown in FIG.
  • the fourth pulse width is also a fixed time value T5, since the triggering start point of the pulse signal is later than the current corresponding to the AC input voltage period.
  • T5 the pulse width of the driving pulse signal
  • the pulse width of the driving pulse signal can be reduced as long as the driving pulse signal can normally trigger the motor driving power device such as the thyristor to be turned on. Pulse width of the pulse signal is reduced, current consumption can be further reduced power device.
  • the first pulse width value ranges from 100 ⁇ T5 ⁇ 800us.
  • the triggering of the driving pulse signal is determined.
  • the pulse width of the current driving pulse signal is controlled to be a preset third pulse width, so that the end point of the driving pulse signal is in the alternating current After the current zero crossing time.
  • the pulse width of the motor driving pulse signal is a preset third pulse width, that is, a preset fixed value, as shown in the figure, the trigger starting point C3 of the first motor driving pulse signal, and the ending point is C4, after the AC motor zero-crossing point C1, its pulse width is the first pulse width value between C3 and C4, and the pulse widths of other driving pulse signals are the third pulse width value T1, because the pulse width of the driving pulse signal is
  • the fixed third pulse width value the MCU controls the output pulse width is relatively simple, and can further reliably ensure that after the AC current zero crossing point, the motor drive power device of the AC motor control circuit such as the thyristor can be continuously turned on, ensuring the motor Normal operation.
  • the first pulse width value ranges from 1 ⁇ T1 ⁇ 8ms.
  • the seventh embodiment of the control method of the AC motor control circuit based on the third embodiment of the control method based on the AC motor control circuit of the present invention, it is determined that the triggering start point of the driving pulse signal is earlier than the current communication.
  • the AC current corresponding to the voltage period corresponds to the zero-crossing point
  • the next voltage zero-crossing point is obtained; the pulse width of the current driving pulse signal is controlled as the time difference between the trigger starting point and the next voltage zero-crossing point.
  • the MCU determines that the trigger starting point of the current driving pulse signal is earlier than the AC current zero-crossing point corresponding to the current AC input voltage period
  • the MCU controls the current driving pulse signal by detecting the next voltage zero-crossing point.
  • the trigger starting point C3 of the first motor drive pulse signal of the specific drawing is located before the AC current zero-crossing point C1 corresponding to the current AC voltage cycle.
  • the end point of the MCU control motor drive pulse signal is A voltage zero-crossing point, that is, C5 moment, that is, the motor driving pulse signal ends from the triggering starting point until the current AC voltage zero-crossing period ends, because the AC current zero-crossing point corresponding to the current AC voltage period is in its voltage zero-crossing period.
  • the motor drive power device of the AC motor control circuit such as the thyristor
  • the effective voltage of the motor input is always loaded during this time.
  • the effective voltage of the motor input terminal always has a waveform between C3 and C5, which ensures the normal operation of the motor.
  • the pulse width of the current driving pulse signal is controlled to be a preset fourth pulse width, and the fourth pulse width is greater than the pulse width of the current pulse signal.
  • the MCU when the MCU determines that the triggering start point of the driving pulse signal is later than the AC current zero-crossing point corresponding to the current AC input voltage period, the MCU controls the pulse width of the driving pulse signal to change to the second pulse width, that is, is fixed.
  • the time value is as shown in FIG. 7 based on the sixth embodiment.
  • the pulse pulse width is adjusted to a fixed time value, and the pulse width thereof. For a fixed time value T5, or as shown in FIG.
  • the fourth pulse width is also a fixed time value T5, since the trigger starting point of the pulse signal is later than the AC current corresponding to the current input voltage period.
  • T5 the pulse width of the driving pulse signal can be reduced, as long as the driving pulse signal can normally trigger the motor driving power device such as the thyristor to be turned on, The pulse width of the pulse signal is reduced, which further reduces the loss current of the power device.
  • the first pulse width value ranges from 100 ⁇ T5 ⁇ 800us.
  • the MCU determines that the triggering start point of the driving pulse signal is earlier than the current zero crossing point corresponding to the current AC input voltage period, corresponding to the first to third driving pulses, and the pulse signal is preset.
  • the third pulse width value T3 when the MCU determines that the triggering start point of the driving pulse signal is later than the alternating current zero crossing point corresponding to the current AC input voltage period, in order to reliably ensure the motor drive of the AC motor control circuit after the AC current zero crossing point If the power device such as the thyristor can be continuously turned on, the preset third pulse width value T3 is greater than T5.
  • the value range of T3 is 1 ⁇ T3 ⁇ 8ms, and the value range of T5 is 100 ⁇ T5 ⁇ 800us. .
  • the pulse width of the current driving pulse signal of the MCU is from the triggering starting point to the next voltage zero-crossing point.
  • the time difference between the current drive pulses is also greater than T5.
  • the present invention also provides a control device based on an AC motor control circuit.
  • FIG. 9 is a schematic diagram of functional modules of a first embodiment of an air conditioner control device based on a wearable device according to the present invention.
  • the wearable device-based air conditioner control device includes:
  • the detecting module 2 is configured to detect a zero-crossing signal of an input voltage of the AC motor control circuit and a real-time speed feedback signal of the AC motor;
  • the control module 3 is configured to adjust a trigger starting point of the current driving pulse signal according to the target rotational speed and the real-time rotational speed feedback signal, and control an end point of the current driving pulse signal after the alternating current zero-crossing point; wherein the driving pulse signal is driven The AC motor runs to the target speed.
  • the target rotational speed is generally obtained by the AC motor control circuit from the device in which it is located.
  • the AC motor control circuit is used for driving the motor of the air conditioner, and the air conditioner obtains the current wind speed gear set by the user, and the MCU then retrieves the storage.
  • the corresponding target speed value is such that the acquisition module 1 acquires the current target speed.
  • the AC motor control circuit realizes the zero-crossing signal detection of the AC input voltage through the A-part circuit in the figure.
  • the zero-crossing detection is mainly implemented based on the optocoupler IC1, and is input to the P1 port of the MCU after being shaped by the transistor Q1.
  • the AC voltage zero-crossing signal waveform as shown in FIG. 2 is obtained at the P1 port, and the B portion of FIG. 1 detects the AC motor speed feedback signal and is input to the P3 port of the MCU for detection.
  • the MCU obtains the target speed value. If the user sets the air conditioner to the low wind position, the MCU obtains the low wind position of 800 rpm by taking the memory data table, and further according to the time of the zero-crossing signal, and then the zero-crossing signal.
  • the initial relative time point gives the initial motor drive pulse signal, as shown in Figure 4 at C3, the motor drive pulse signal is combined with the current motor speed feedback signal to adjust the trigger pulse position of the drive pulse signal after the zero-crossing signal. To adjust the speed of the motor to reach the target speed value.
  • the real-time rotational speed feedback signal of the motor drive circuit obtains the current real-time rotational speed, and adjusts the trigger starting point of the current driving pulse signal according to the target rotational speed value, and the trigger starting point of adjusting the current driving pulse signal as shown in the figure is C3.
  • the first zero-crossing signal of the current at the full voltage of the motor is C1, which is later than the first zero-crossing signal 0 of the AC input voltage.
  • the MCU outputs the pulse signal
  • the end point of the output pulse signal is controlled.
  • the end point of the control drive pulse signal in the figure is C4, which is located after C1.
  • the end point C4 of the driving pulse signal is located after the current zero-crossing point C1, it is ensured that when the current of the alternating current motor crosses the zero time C1, there is still a driving pulse signal, which ensures that the thyristor can still be continuously turned on and does not turn off, so that The effective voltage is still loaded on the AC motor, that is, the effective voltage is still loaded at the time of C1 to C5 in the figure, which ensures that the AC motor can be continuously loaded from the trigger starting point C3 of the pulse signal until the end of the AC voltage zero-crossing period.
  • the voltage avoids the prior art in which the AC motor is turned off due to the current zero-crossing point, and the motor drive power device such as the thyristor is turned off, so that the subsequent AC voltage zero-crossing period cannot load the effective voltage, causing the motor speed to be unstable. An anomaly of jitter has occurred.
  • the current signal of the AC motor in the figure is the current signal when the full voltage is applied thereto, that is, the AC motor is always loaded continuously during the entire period of the voltage, usually the motor. At the maximum speed, the current signal of the motor is also present in all cycles. The phase difference between the two can be clearly displayed through multiple zero-crossing points. Of course, it can also be displayed by the current signal of the current motor speed. If the motor is not fully loaded, the current signal must be discontinuous. If you want to show the comparison between its zero-crossing point and the zero-crossing of the AC input voltage, it is not convenient to compare.
  • the phase difference between the voltage and current phases is usually different.
  • the voltage and current of the specific type of motor used are different.
  • the time difference parameter of zero point can be easily obtained in the test, generally a range value, and the maximum value of the range value can be taken as the time difference parameter.
  • the MCU drives the pulse signal to drive the AC motor to reach the target speed through the above control, specifically: the MCU outputs the driving pulse signal to the AC motor driving circuit, and the driving circuit converts according to the driving pulse according to the AC input voltage, and is loaded in the AC motor.
  • the power input terminal realizes the normal operation of the motor.
  • the MCU outputs the driving pulse signal through the P2 port.
  • the motor driving circuit is mainly composed of the motor driving power device. As shown in the figure, the thyristor TR1 and the MCU output the driving pulse signal pass through the triode.
  • the Q2 controls the optocoupler IC3, and the optocoupler IC3 triggers the G-stage of the thyristor according to the pulse signal, so that the thyristor is turned on, when the starting point of the control drive pulse signal is at different times in the AC voltage zero-crossing period
  • the conduction angle of the thyristor is different, which results in different AC currents passing through the thyristor from this week. Therefore, the RMS value of the AC voltage applied to the AC motor is different, thereby changing the rotation speed of the motor and further combining the AC motor.
  • the real-time speed feedback signal determines whether the current speed is the same as the target speed. When the speed is different, the target speed is finally reached by changing the conduction angle of the thyristor.
  • the AC motor control circuit detects the zero-speed signal of the input voltage of the AC motor control circuit and the speed feedback signal of the AC motor through the relevant circuit by acquiring the target rotational speed of the device, and the MCU in the AC drive circuit is based on the zero-crossing signal.
  • the speed feedback signal outputs a driving pulse signal, and adjusts a trigger starting point of the current driving pulse signal according to the target speed and the real-time speed feedback signal output, and controls an end point of the driving pulse signal after the alternating current zero-crossing point
  • the driving pulse signal of the AC motor control circuit when the driving pulse signal of the AC motor control circuit is in the above situation, the power device driven by the motor such as the thyristor in the driving circuit occurs when the current zero crossing point occurs.
  • the abnormal problem of unstable speed and jitter caused by the operation of the AC motor is closed, which ensures the smooth and reliable normal operation of the AC motor.
  • the current adjustment is performed according to the target rotational speed and the real-time rotational speed feedback signal.
  • Driving a triggering start point of the pulse signal, and the pulse width of the current driving pulse signal is a preset first pulse width value, so that the end point of the driving pulse signal is after the moment of the alternating current zero crossing point, that is, controlling the current
  • the pulse width of the drive pulse signal is a preset fixed pulse width value.
  • the pulse width of the motor drive pulse signal is a fixed value, as shown in the figure, the trigger start point C3 of the first motor drive pulse signal, and the end point is C4, which is located after the zero crossing point C1 of the AC motor, and its pulse width.
  • the first pulse width value T1 between C3 and C4, the pulse width of the other driving pulse signals is the first pulse width value, and the MCU controls the output pulse width because the pulse width of the driving pulse signal is a fixed first pulse width value.
  • the time is relatively simple, and can further reliably ensure that the motor drive power device of the AC motor control circuit, such as the thyristor, can be continuously turned on after the AC current zero crossing point, thereby ensuring the normal operation of the motor.
  • the first pulse width is The value range is 1 ⁇ T1 ⁇ 8ms.
  • the end point of controlling the driving pulse signal may further subdivide the control.
  • the next voltage zero-crossing point is further acquired, and the pulse width of the current driving pulse signal is controlled to be the trigger starting point. The time difference between the moments of the next voltage zero crossing.
  • the trigger starting point C3 of the first motor driving pulse signal of the specific drawing is located in the current alternating voltage period.
  • the end point of the MCU control motor drive pulse signal is the next voltage zero-crossing point, that is, C5 time, that is, the motor drive pulse signal starts from the trigger start point until the current AC voltage zero-crossing period.
  • the triggering of the driving pulse signal is determined.
  • the end point of the driving pulse signal is controlled after the AC current zero-crossing time; the AC motor is driven to reach the target according to the driving pulse signal Rotating speed.
  • the first zero-crossing signal of the current at the full voltage of the motor is C1, which is later than the first zero-crossing signal 0 of the AC input voltage.
  • the MCU outputs the pulse signal according to the above S30 step, It is judged whether the trigger starting point of the pulse signal is before the time C1, and if it is before, the end point of the control output pulse signal is after the time C1, that is, the trigger starting point of the motor driving pulse signal in the figure is C3, before the time C1, Then, the end point of the control drive pulse signal is C4, which is located after C1.
  • the end point C4 of the driving pulse signal is located after the current zero-crossing point C1, it is ensured that when the current of the alternating current motor crosses the zero time C1, there is still a driving pulse signal, which ensures that the thyristor can still be continuously turned on and does not turn off, so that The effective voltage is still loaded on the AC motor, that is, the effective voltage is still loaded at the time of C1 to C5 in the figure, which ensures that the AC motor can be continuously loaded from the trigger starting point C3 of the pulse signal until the end of the AC voltage zero-crossing period.
  • the voltage avoids the prior art in which the AC motor is turned off due to the current zero-crossing point, and the motor drive power device such as the thyristor is turned off, so that the subsequent AC voltage zero-crossing period cannot load the effective voltage, causing the motor speed to be unstable. An anomaly of jitter has occurred.
  • the triggering of the driving pulse signal is determined.
  • the starting point is earlier than the AC current zero-crossing point corresponding to the AC input voltage period, the AC current zero-crossing point corresponding to the AC input voltage period is obtained;
  • the pulse width of the current drive pulse signal is adjusted such that the end point of the drive pulse signal is after the moment of the AC current zero crossing.
  • the MCU determines that the triggering start time of the driving pulse signal is earlier than the current zero crossing point of the current AC motor, the AC current zero crossing point corresponding to the current AC input voltage period is acquired, and the current adjustment is adjusted.
  • the pulse width of the drive pulse signal that is, the pulse width of its drive pulse signal, can be varied. Since the target speed of the AC motor is different, the triggering start point of the pulse signal will be different when the MCU outputs the driving pulse signal according to the target speed and the real-time speed feedback signal, and the triggering start point time of the driving pulse signal is earlier than the current AC motor.
  • the motor drive power device When the current crosses the zero point, in order to ensure that the motor drive power device can be continuously turned on and not turned off at the time of the zero crossing of the AC motor, it is necessary to control the end point of the driving pulse signal after the moment of the AC current zero crossing. Specifically, as long as the end point is at a fixed time of a small preset time difference after the zero-crossing point of the alternating current, that is, as long as the motor-driven power device can be continuously turned on at the zero-crossing point of the alternating current, The triggering start point of the drive pulse signal is variable, and the end time is fixed, so the pulse width of the drive pulse is variable. Specifically, as shown in FIG.
  • the start point of the trigger of the first drive pulse to the third drive pulse of the motor drive signal is different, and the end point of the pulse is a fixed time, after each current zero-crossing time, therefore
  • the pulse width is different.
  • the triggering starting point of the driving pulse gradually approaches the voltage zero-crossing point in the current week, such as
  • the trigger starting point of the first to third pulses in the figure is gradually closer to the first zero-crossing point of the AC input voltage, so that the pulse width of the driving pulse is gradually longer, and each pulse width is different, that is, the pulse in the figure
  • the processing scheme can ensure that the pulse width of the driving pulse is as narrow as possible when the current driving device of the AC motor is continuously turned on, and the loss current of the power device is further reduced.
  • the drive pulse signal is determined.
  • the pulse width of the current driving pulse signal is controlled to be a preset second pulse width.
  • the MCU determines that the triggering start point of the driving pulse signal is later than the AC current zero-crossing point corresponding to the current AC input voltage period
  • the MCU controls the pulse width of the driving pulse signal to change to the second pulse width, that is,
  • the fixed time value is as shown in FIG. 7 based on the third embodiment.
  • the pulse pulse width is adjusted to a fixed time value, and the pulse is adjusted.
  • the width is a fixed time value T5, or as shown in FIG.
  • the fourth pulse width is also a fixed time value T5, since the triggering start point of the pulse signal is later than the current corresponding to the AC input voltage period.
  • T5 the pulse width of the driving pulse signal
  • the pulse width of the driving pulse signal can be reduced as long as the driving pulse signal can normally trigger the motor driving power device such as the thyristor to be turned on. Pulse width of the pulse signal is reduced, current consumption can be further reduced power device.
  • the first pulse width value ranges from 100 ⁇ T5 ⁇ 800us.
  • the triggering of the drive pulse signal is determined.
  • the pulse width of the current driving pulse signal is controlled to be a preset third pulse width, so that the end point of the driving pulse signal is in the alternating current After the current zero crossing time.
  • the pulse width of the motor driving pulse signal is a preset third pulse width, that is, a preset fixed value, as shown in the figure, the trigger starting point C3 of the first motor driving pulse signal, and the ending point is C4, after the AC motor zero-crossing point C1, its pulse width is the first pulse width value between C3 and C4, and the pulse widths of other driving pulse signals are the third pulse width value T1, because the pulse width of the driving pulse signal is
  • the fixed third pulse width value the MCU controls the output pulse width is relatively simple, and can further reliably ensure that after the AC current zero crossing point, the motor drive power device of the AC motor control circuit such as the thyristor can be continuously turned on, ensuring the motor Normal operation.
  • the first pulse width value ranges from 1 ⁇ T1 ⁇ 8ms.
  • the seventh embodiment of the control device for the AC motor control circuit based on the third embodiment of the control device based on the AC motor control circuit of the present invention, it is determined that the triggering start point of the driving pulse signal is earlier than the current communication.
  • the AC current corresponding to the voltage period corresponds to the zero-crossing point
  • the next voltage zero-crossing point is obtained; the pulse width of the current driving pulse signal is controlled as the time difference between the trigger starting point and the next voltage zero-crossing point.
  • the MCU determines that the trigger starting point of the current driving pulse signal is earlier than the AC current zero-crossing point corresponding to the current AC input voltage period
  • the MCU controls the current driving pulse signal by detecting the next voltage zero-crossing point.
  • the trigger starting point C3 of the first motor drive pulse signal of the specific drawing is located before the AC current zero-crossing point C1 corresponding to the current AC voltage cycle.
  • the end point of the MCU control motor drive pulse signal is A voltage zero-crossing point, that is, C5 moment, that is, the motor driving pulse signal ends from the triggering starting point until the current AC voltage zero-crossing period ends, because the AC current zero-crossing point corresponding to the current AC voltage period is in its voltage zero-crossing period.
  • the motor drive power device of the AC motor control circuit such as the thyristor
  • the effective voltage of the motor input is always loaded during this time.
  • the effective voltage of the motor input terminal always has a waveform between C3 and C5, which ensures the normal operation of the motor.
  • the pulse width of the current driving pulse signal is controlled to be a preset fourth pulse width, and the fourth pulse width is greater than the pulse width of the current pulse signal.
  • the MCU when the MCU determines that the triggering start point of the driving pulse signal is later than the AC current zero-crossing point corresponding to the current AC input voltage period, the MCU controls the pulse width of the driving pulse signal to change to the second pulse width, that is, is fixed.
  • the time value is as shown in FIG. 7 based on the sixth embodiment.
  • the pulse pulse width is adjusted to a fixed time value, and the pulse width thereof. For a fixed time value T5, or as shown in FIG.
  • the fourth pulse width is also a fixed time value T5, since the trigger starting point of the pulse signal is later than the AC current corresponding to the current input voltage period.
  • T5 the pulse width of the driving pulse signal can be reduced, as long as the driving pulse signal can normally trigger the motor driving power device such as the thyristor to be turned on, The pulse width of the pulse signal is reduced, which further reduces the loss current of the power device.
  • the first pulse width value ranges from 100 ⁇ T5 ⁇ 800us.
  • the MCU determines that the triggering start point of the driving pulse signal is earlier than the current zero crossing point corresponding to the current AC input voltage period, corresponding to the first to third driving pulses, and the pulse signal is preset.
  • the third pulse width value T3 when the MCU determines that the triggering start point of the driving pulse signal is later than the alternating current zero crossing point corresponding to the current AC input voltage period, in order to reliably ensure the motor drive of the AC motor control circuit after the AC current zero crossing point If the power device such as the thyristor can be continuously turned on, the preset third pulse width value T3 is greater than T5.
  • the value range of T3 is 1 ⁇ T3 ⁇ 8ms, and the value range of T5 is 100 ⁇ T5 ⁇ 800us. .
  • the pulse width of the current driving pulse signal of the MCU is from the triggering starting point to the next voltage zero-crossing point.
  • the time difference between the current drive pulses is also greater than T5.
  • the invention also provides an air conditioner.
  • the air conditioner includes, in addition to the various components and control circuits mentioned in the prior art, the above-mentioned control device based on the AC motor control circuit for controlling the indoor or outdoor fan of the air conditioner. run.
  • the AC motor control circuit of the air conditioner detects the zero-crossing signal of the input voltage of the AC motor control circuit and the speed feedback signal of the AC motor through the relevant circuit by acquiring the target rotational speed of the device, and the AC drive circuit
  • the MCU outputs a driving pulse signal according to the zero-crossing signal and the speed feedback signal, and adjusts a trigger starting point of the current driving pulse signal according to the target speed and the real-time speed feedback signal output, and adjusts the current according to the target speed and the real-time speed feedback signal output.
  • the triggering starting point of the driving pulse signal avoids the controllable driving circuit in the driving circuit when the AC motor control circuit is in the above situation when the AC motor control circuit is in the above situation.
  • the power device driven by a motor such as silicon is turned off, causing an abnormal problem of unstable speed and jitter during operation of the AC motor, ensuring stable and reliable normal operation of the AC motor.

Abstract

L'invention concerne un procédé et un dispositif de commande basés sur un circuit de commande de moteur électrique à courant alternatif, et un climatiseur. Le procédé de commande consiste à : acquérir une vitesse de rotation cible d'un moteur électrique à courant alternatif (S10) ; détecter un signal de passage par zéro d'une tension d'entrée d'un circuit de commande de moteur électrique à courant alternatif et un signal de rétroaction de vitesse de rotation en temps réel du moteur électrique à courant alternatif (S20) ; et émettre un signal d'impulsion de commande en fonction de la vitesse de rotation cible et du signal de rétroaction de vitesse de rotation en temps réel, et émettre et ajuster un point de début de déclenchement du signal d'impulsion de commande de courant en fonction de la vitesse de rotation cible et du signal de rétroaction de vitesse de rotation en temps réel, et commander le point de fin du signal d'impulsion de commande de telle sorte qu'il soit ultérieur à un moment de passage par zéro du courant alternatif, et enfin commander, en fonction du signal d'impulsion de commande, le fonctionnement du moteur électrique à courant alternatif de sorte que celui-ci atteigne la vitesse de rotation cible (S30). Ainsi, il est garanti qu'un moteur électrique à courant alternatif n'a pas de problème anormal de vitesse de rotation instable, et un fonctionnement stable et fiable du moteur électrique à courant alternatif est garanti.
PCT/CN2017/082516 2016-09-29 2017-04-28 Procédé et dispositif de commande de moteur électrique à courant alternatif, et climatiseur WO2018058956A1 (fr)

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