WO2016192160A1 - Dispositif et procédé de protection de surtension de circuit pec dans un appareil ménager électrique à fréquence variable - Google Patents

Dispositif et procédé de protection de surtension de circuit pec dans un appareil ménager électrique à fréquence variable Download PDF

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Publication number
WO2016192160A1
WO2016192160A1 PCT/CN2015/082870 CN2015082870W WO2016192160A1 WO 2016192160 A1 WO2016192160 A1 WO 2016192160A1 CN 2015082870 W CN2015082870 W CN 2015082870W WO 2016192160 A1 WO2016192160 A1 WO 2016192160A1
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Prior art keywords
voltage
pfc circuit
pfc
motor
frequency
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PCT/CN2015/082870
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English (en)
Chinese (zh)
Inventor
盛爽
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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 WO2016192160A1 publication Critical patent/WO2016192160A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the invention relates to the technical field of air conditioning systems, in particular to a voltage surge protection device for a PFC (Power Factor Correction) circuit in a frequency conversion household electrical appliance and a voltage swell of a PFC circuit used in a frequency conversion household electrical appliance Protection method.
  • a voltage surge protection device for a PFC (Power Factor Correction) circuit in a frequency conversion household electrical appliance and a voltage swell of a PFC circuit used in a frequency conversion household electrical appliance Protection method.
  • Frequency conversion is gradually becoming the trend of household appliances, especially air conditioners, refrigerators and washing machines.
  • the frequency conversion technology can greatly save the electricity consumption of household appliances, and has the advantages of low noise and high performance.
  • a PFC circuit is generally used to satisfy the boost function and the power factor correction function.
  • the PFC circuit is usually a Boost type PFC circuit, and the circuit mainly includes an inductor, a fast recovery diode and a power switching device.
  • the power switching device is an important device for realizing the boost function and the power factor correction function.
  • the power switching device is easily damaged, and therefore, it needs to be protected.
  • the quality of the power supply used is one of the important aspects.
  • the power supply used such as the mains voltage
  • the power supply voltage drops instantaneously or suddenly rises
  • the software control algorithm is unreasonable or the processing is not timely (slow response)
  • the power switching device may over-current or over-voltage, resulting in power switching. The device is damaged.
  • the load power supply is disconnected by directly turning on the protection function to protect the power switching device.
  • this method is suitable for terminal power grids or distributed power grids, such as township and rural power grids, because the grid voltage is unstable and the disturbance is frequent, and the household electrical appliances are difficult to work normally, especially the frequency conversion household appliances, and it is easy to frequently start and stop. It does not play a role in saving electricity, but also greatly affects the user's comfort and experience.
  • the present invention aims to solve at least one of the technical problems in the related art to some extent.
  • an object of the present invention is to provide a voltage surge protection device for a PFC circuit in a frequency conversion household appliance, which can ensure that the PFC circuit is not damaged when the voltage is suddenly increased, and at the same time ensure that the frequency conversion household appliance does not stop running.
  • Another object of the present invention is to provide a voltage swell protection method for a PFC circuit in a frequency conversion household electrical appliance. law.
  • an embodiment of the present invention provides a voltage surge protection device for a PFC circuit in a frequency conversion home appliance, the frequency conversion home appliance including the PFC circuit, and controlling the PFC circuit to be turned on and off.
  • a PFC control module, a motor, and a motor controller the voltage swell protection device includes: a first voltage detecting module, the first voltage detecting module is configured to detect an input voltage of the PFC circuit; and a current detecting module, the current a detection module is configured to detect an input current of the PFC circuit; a second voltage detection module, the second voltage detection module is configured to detect an output voltage of the PFC circuit; and a protection module, wherein the protection module respectively a voltage detecting module, the current detecting module, the second voltage detecting module, the PFC control module and the motor controller are connected, wherein the protection module is configured to compare the input voltage and the output voltage Generating a first comparison result, and comparing the input current with a preset maximum allowable current to generate a second comparison result
  • a voltage swell protection device for a PFC circuit in a frequency conversion household electrical appliance detects an input voltage of a PFC circuit through a first voltage detecting module, and detects an input current of the PFC circuit through the current detecting module, and passes the second
  • the voltage detecting module detects an output voltage of the PFC circuit
  • the protection module compares the input voltage and the output voltage to generate a first comparison result, and compares the input current with a preset maximum allowable current to generate a second comparison result, and according to the A comparison result and a second comparison result respectively control the PFC circuit through the PFC control module and control the motor through the motor controller, thereby effectively preventing the PFC circuit from being damaged when the voltage is swelled, and ensuring that the motor does not stop working and improves The reliability and user experience of frequency conversion home appliances.
  • the protection module when the input voltage is greater than or equal to the output voltage and the input current is greater than or equal to the preset maximum allowable current, the protection module outputs a first protection signal to the
  • the PFC control module is configured to cause the PFC control module to control the PFC circuit to be turned off, and output a second protection signal to the motor controller to cause the motor controller to control the motor to operate in a down frequency.
  • the protection module outputs a first protection signal to the PFC control when the input voltage is greater than or equal to the output voltage and the input current is less than the preset maximum allowable current a module, wherein the PFC control module turns off the PFC circuit, and when the inductance L in the PFC circuit is less than a first preset inductance or the switching frequency of the PFC circuit is greater than a first preset frequency
  • the motor controller controls the motor to run down in advance.
  • the protection module when the input voltage is greater than or equal to the output voltage and the input current is less than the preset maximum allowable current, the protection module outputs a first protection signal to the PFC control module, so that the PFC control mode Blocking the PFC circuit, and controlling, by the motor controller, when the inductance L in the PFC circuit is greater than or equal to a first predetermined inductance and the switching frequency of the PFC circuit is less than or equal to a first preset frequency
  • the motor operates normally at the preset frequency.
  • the first preset inductance may be 0.5-1 mH, and the first preset frequency may be 15-25 KHz.
  • the protection module outputs a first protection signal to the PFC control when the input voltage is less than the output voltage and the input current is greater than or equal to the preset maximum allowable current
  • a module wherein the PFC control module controls the PFC circuit to be turned off, and outputs a second protection signal to the motor controller to cause the motor controller to control the motor to operate in a down frequency.
  • the PFC control module controls the PFC circuit to be turned on, the motor control The motor controls the motor to operate normally at a preset frequency.
  • another embodiment of the present invention provides a voltage swell protection method for a PFC circuit in a frequency conversion home appliance, the frequency conversion home appliance including the PFC circuit, and controlling the PFC circuit to be turned on and off.
  • the PFC control module, the motor, the motor controller, the voltage swell protection method includes the steps of: detecting an input voltage of the PFC circuit, and detecting an input current of the PFC circuit; detecting an output voltage of the PFC circuit; And comparing the input voltage and the output voltage to generate a first comparison result, and comparing the input current with a preset maximum allowable current to generate a second comparison result, and according to the first comparison result And the second comparison result respectively controlling the PFC circuit by the PFC control module and controlling the motor by the motor controller.
  • a voltage swell protection method for a PFC circuit in a frequency conversion household appliance first detects an input voltage of a PFC circuit, detects an input current of the PFC circuit, and detects an output voltage of the PFC circuit, and then inputs the voltage and output The voltages are compared to generate a first comparison result, and the input current is compared with a preset maximum allowable current to generate a second comparison result, and the PFC circuit is respectively performed by the PFC control module according to the first comparison result and the second comparison result respectively Control and control the motor through the motor controller, which can effectively avoid the damage of the PFC circuit when the voltage rises, and ensure that the motor does not stop working, improving the reliability and user experience of the frequency conversion household appliances.
  • the PFC control module when the input voltage is greater than or equal to the output voltage and the input current is greater than or equal to the preset maximum allowable current, outputting a first protection signal to the PFC control module,
  • the PFC control module is configured to control the PFC circuit to be turned off, and output a second protection signal to the motor controller to cause the motor controller to control the motor to operate in a down frequency.
  • the first protection signal is output to the PFC control module, so that the PFC control module turns off the PFC circuit, and the inductance L in the PFC circuit is smaller than the first pre-
  • the motor controller controls the motor to perform an early frequency down operation when the inductance or the switching frequency of the PFC circuit is greater than the first preset frequency.
  • the motor controller controls the motor to follow Set the frequency to operate normally.
  • the first preset inductance may be 0.5-1 mH, and the first preset frequency may be 15-25 KHz.
  • the PFC control module when the input voltage is less than the output voltage and the input current is greater than or equal to the preset maximum allowable current, outputting a first protection signal to the PFC control module, so that The PFC control module controls the PFC circuit to be turned off, and outputs a second protection signal to the motor controller to cause the motor controller to control the motor to run down.
  • the PFC control module controls the PFC circuit to be turned on, the motor control The motor controls the motor to operate normally at a preset frequency.
  • FIG. 1 is a block diagram showing a voltage surge protection device for a PFC circuit in a frequency conversion household appliance according to an embodiment of the present invention
  • IGBT Insulated Gate Bipolar Transistor
  • FIG. 3 is an equivalent circuit diagram of a power switching device IGBT when turned off according to an embodiment of the present invention
  • FIG. 4 is a waveform diagram of an input current in one switching cycle when an input voltage is less than an output voltage according to an embodiment of the present invention
  • FIG. 5 is a waveform diagram of voltage and current of a PFC circuit under normal conditions, in accordance with an embodiment of the present invention.
  • FIG. 6 is a waveform diagram of an input current in one switching period when an input voltage is greater than or equal to an output voltage, according to an embodiment of the present invention
  • FIG. 7 is a waveform diagram of voltage and current of a PFC circuit when a voltage of a FPC circuit is swelled according to an embodiment of the present invention
  • FIG. 8 is a waveform diagram of voltage and current of a PFC circuit protected by a voltage swell protection device when a voltage of a FPC circuit is swelled according to an embodiment of the present invention
  • FIG. 9 is a flow chart of a voltage swell protection method for a PFC circuit in a frequency conversion household appliance according to an embodiment of the present invention.
  • a voltage swell protection device for a PFC circuit in a frequency conversion home appliance and a voltage swell protection method for a PFC circuit in a frequency conversion home appliance according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
  • FIG. 1 is a block schematic diagram of a voltage swell protection device for a PFC circuit in a frequency conversion household appliance according to an embodiment of the present invention, wherein the frequency conversion household appliance includes a PFC circuit, a PFC control module 10 that controls opening and closing of the PFC circuit, and a motor M, motor controller 20.
  • the voltage swell protection device for the PFC circuit in the inverter household electrical appliance includes a first voltage detecting module 30, a current detecting module 40, a second voltage detecting module 50, and a protection module 60.
  • the first voltage detecting module 30 is configured to detect an input voltage of the PFC circuit.
  • the current detecting module 40 is configured to detect an input current of the PFC circuit.
  • the second voltage detecting module 50 is configured to detect an output voltage of the PFC circuit.
  • the protection module 60 is respectively connected to the first voltage detecting module 30, the current detecting module 40, the second voltage detecting module 50, the PFC control module 10 and the motor controller 20.
  • the protection module 60 is configured to compare the input voltage and the output voltage to generate a first comparison result, and comparing the input current with the preset maximum allowable current to generate a second comparison result, and controlling the PFC circuit and passing the motor through the PFC control module 10 according to the first comparison result and the second comparison result, respectively
  • the controller 20 controls the motor M.
  • the motor M is a compressor.
  • the preset maximum allowable current can be calibrated according to actual conditions.
  • the protection module 60 when the input voltage is greater than or equal to the output voltage and the input current is greater than or equal to the preset maximum allowable current, the protection module 60 outputs the first protection signal to the PFC control module 10 to cause the PFC control module 10 to control.
  • the PFC circuit is turned off and a second protection signal is output to the motor controller 20 to cause the motor controller 20 to control the motor M to operate down.
  • the protection module 60 when the input voltage is greater than or equal to the output voltage and the input current is less than the preset maximum allowable current, the protection module 60 outputs the first protection signal to the PFC control module 10 to cause the PFC control module 10 to turn off the PFC circuit. And when the inductance L in the PFC circuit is less than the first preset inductance or the switching frequency of the PFC circuit is greater than the first preset frequency, the motor M is controlled by the motor controller 20 to perform the frequency reduction operation in advance.
  • the protection module 60 when the input voltage is greater than or equal to the output voltage and the input current is less than the preset maximum allowable current, the protection module 60 outputs a first protection signal to the PFC control module 10 to cause the PFC control module 10 to turn off the PFC circuit, and
  • the motor M is controlled by the motor controller 20 to operate normally according to the preset frequency.
  • the preset frequency can be calibrated according to the actual situation.
  • the first preset inductance may be 0.5-1 mH, and the first preset frequency may be 15-25 KHz.
  • the first preset inductance may be 1 mH, and the first preset frequency may be 20 kHz.
  • the protection module 60 when the input voltage is less than the output voltage and the input current is greater than or equal to the preset maximum allowable current, the protection module 60 outputs the first protection signal to the PFC control module 10 to cause the PFC control module 10 to control the PFC circuit.
  • the second protection signal is turned off and output to the motor controller 20 to cause the motor controller 20 to control the motor M to operate down.
  • the PFC control module 10 controls the PFC circuit to be turned on, and the motor controller 20 controls the motor M to operate normally according to the preset frequency.
  • the opening and closing of the PFC circuit refers to the opening and closing of a power switching device such as an IGBT in the PFC circuit.
  • the Boost type PFC circuit shown in FIG. 1 mainly includes an inductor L, a fast recovery diode D1, a power switching device IGBT, and an electrolytic capacitor EC.
  • the protection module 60 determines the switching state of the power switching device IGBT according to the input voltage V in detected by the first voltage detecting module 30, the input current I in detected by the current detecting module 40, and the output voltage V out detected by the second voltage detecting module 50. The operating state of the motor M.
  • the equivalent circuit is shown in FIG. 2, and the voltage on the inductor L is the voltage output by the AC power source after being rectified by the diode rectifier bridge, that is, the input voltage detected by the first voltage detecting module 30. V in . Since the input voltage V in is always greater than zero, the current flowing through the inductor L gradually rises, that is, the input current I in detected by the current detecting module 40 gradually increases; when the power switching device IGBT is in the off state, the equivalent circuit thereof 3, the voltage on the inductance L of the difference between the input voltage V in the PFC circuit and the output voltage V out.
  • the Boost type PFC circuit only has a boost function, under normal operating conditions, the input voltage V in of the PFC circuit is smaller than the output voltage V out , and the voltage on the inductor L is reversed. At this time, the current flowing through the inductor L will gradually The falling, that is, the input current I in detected by the current detecting module 40 gradually decreases. Therefore, in one switching cycle of the power switching device IGBT, the waveform of the input current I in is as shown in FIG.
  • the input voltage V in may exceed the output voltage V out .
  • the control power switching device IGBT is turned off, since the voltage on the inductor L (V in -V out ) is greater than zero, the flow The current through inductor L will continue to rise, as shown in Figure 6.
  • the current flowing through the inductor L rises rapidly until the over-current, as shown in FIG.
  • the time interval t 1 -t 2 shown in FIG. 7 is a time interval in which the input voltage V in is greater than the output voltage V out , and in this time interval, if the power switching device IGBT is in an on state, the input current is input. I in will rise faster.
  • the input voltage V in the Boost-type PFC circuit is greater than the output voltage V out
  • the protection module 60 is The input voltage V in which the voltage detecting module 30 detects in real time, the input current I in detected by the current detecting module 40 in real time, and the output voltage V out detected by the second voltage detecting module 50 in real time perform protection control on the PFC circuit and the motor M.
  • the protection module 60 compares the detected input voltage V in with the output voltage V out to output a first protection signal PFC_PRT_FLAG to the PFC control module 10, and the PFC control module 10 pairs the power switching device IGBT according to the first protection signal PFC_PRT_FLAG. Take control. Wherein, when the input voltage V in is greater than or equal to the output voltage V out , the protection of the power switching device IGBT is turned on, and the first protection signal PFC_PRT_FLAG is set to 1, and the duty signal of the driving signal of the power switching device IGBT output by the PFC control module 10 is occupied.
  • the PFC circuit When the ratio D is 0, the PFC circuit is turned off; when the input voltage V in is smaller than the output voltage V out , the protection of the power switching device IGBT is turned off, and the first protection signal PFC_PRT_FLAG is cleared, and the driving signal of the power switching device IGBT is controlled by the PFC control module. 10 controls. Meanwhile, in order to prevent an overcurrent phenomenon from occurring due to an excessive input current I in , the protection module 60 also determines the input current I in and outputs a second protection signal MTR_PRT_FLAG to the motor controller 20, and the motor controller 20 according to the second The protection signal MTR_PRT_FLAG controls the motor M.
  • the speed of the motor M is reduced to reduce the load, thereby reducing the input current I in to ensure that the motor M does not stop running; when the input current When I in is less than the preset maximum allowable current I max , the motor M returns to the normal speed and operates at the original load.
  • the input current I in is greater than or equal to the preset maximum allowable current I max , in order to prevent damage when the power switching device IGBT is turned on, whether the input voltage V in is greater than the output voltage V out is required to be ensured.
  • the power switching device IGBT is in an off state.
  • the protective module 60 according to the control logic shown in Table 1, and the motor M for controlling a PFC circuit to ensure PFC circuit can effectively reduce the input current I in at AC power source voltage suddenly rises, so as to ensure The PFC circuit does not flow, and at the same time ensures that the motor M does not stop running.
  • This state is the normal operating state of the Boost type PFC circuit.
  • Boost function of Boost PFC circuit so that the output voltage V out is greater than the input voltage V in, and, input current I in normal operating conditions is less than the predetermined maximum permissible current I max The maximum allowed current of the power switching devices of IGBT, the When the PFC circuit is normally turned on, the motor M operates normally according to the preset frequency.
  • f is the switching frequency and D is the IGBT turn-on duty.
  • the motor M when the inductance of the inductor L is less than 1 mH, for example, L0 is 1 uH-1 mH (ie, L0 is small, the overcurrent phenomenon is more likely to occur), the motor M is required to be controlled by the motor controller 20 to be down-converted in advance, or when the PFC circuit is When the switching frequency of the IGBT is greater than 20KHz, for example, 20-100KHz (ie, the switching frequency is higher, L0 is smaller, and the overcurrent phenomenon is more likely to occur), the motor M is required to be controlled by the motor controller 20 to reduce the frequency in advance; and when the inductance of the inductor L is When the amount is greater than or equal to 1 mH and the switching frequency of the PFC circuit, ie, the IGBT, is less than or equal to 20 KHz, the motor M is controlled by the motor controller 20 to operate normally according to the preset frequency.
  • the inductance value of the inductor L is relatively small (for example, when the switching frequency of the PFC circuit is greater than 20 kHz when the high frequency PFC circuit is used), even if the power switching device IGBT is always turned off, the rising speed of the input current I in is also Will be very fast. Further, when a relatively large electrolytic capacitor EC, the rising speed of the output voltage V out is relatively slow, it is possible to output voltage V out will be less than the input voltage V in a long period of time, when required by the motor controller 20 controls the motor M Run down in advance to avoid overcurrent.
  • the machine controller 20 can control the normal operation of the motor M according to a preset frequency.
  • the PFC control module 10 is required to control the PFC circuit to be turned off, and the motor controller 20 is controlled to reduce the frequency of the motor M, thereby ensuring that the power switching device IGBT is not damaged, and on the other hand, the diode rectifier bridge and the fast recovery diode D1 and the like.
  • the overcurrent capability is much larger than that of the power switching device IGBT. Therefore, the motor M can be operated for a further period of time by down-conversion operation. If the input current I in continues to rise, the power supply needs to be disconnected to protect the variable frequency home appliance.
  • the motor controller 20 is required to control the motor M to operate down.
  • the waveforms of the input voltage V in , the input current I in , and the output voltage V out of the protected PFC circuit are as shown in FIG. Comparison with FIG. 7, when the AC power supply voltage rises abruptly, can effectively reduce the input current I in current and power switching devices of IGBT, and to ensure non-stop operation.
  • a first current threshold I max2 may be added, which is set according to the maximum allowable current of the diode rectifier bridge and the fast recovery diode D1. set. Since the overcurrent capability of the diode rectifier bridge and the fast recovery diode D1 is much larger than that of the power switching device IGBT, the first current threshold I max2 is greater than the maximum allowable current of the power switching device IGBT, that is, the preset maximum allowable current I max .
  • the control logic of the protection module 60 is as shown in Table 2.
  • the PFC circuit protection module 10 controls the PFC circuit to be turned off, and the motor controller 20 controls the motor M to operate normally according to a preset frequency or to perform a frequency reduction operation in advance.
  • the motor M is controlled to be down-converted by the motor controller 20, otherwise, the motor M is controlled by the motor controller 20 to operate normally according to the preset frequency. .
  • the power switching device IGBT When V out >V in and I max ⁇ I in ⁇ I max2 , the power switching device IGBT is first turned off to protect it from damage. In addition, since the output voltage V out is greater than the input voltage V in such that the voltage on the inductor L is reversed, the input current I in will gradually drop to a normal value, and the motor M can be down-converted by reducing the rotational speed command ⁇ * to The input current I in can be quickly restored to a normal value.
  • the control mode of the motor down- conversion operation is further determined by the preset intermediate current threshold I max21 .
  • the power switching device IGBT When V out ⁇ V in and I max ⁇ I in ⁇ I max21 , the power switching device IGBT is turned off to protect it from damage, and the motor M is down- converted by reducing the rotational speed command ⁇ * ;
  • V out ⁇ V In and I max21 ⁇ I in ⁇ I max2 the power switching device IGBT is first turned off to protect it from damage, and in addition, although the input current I in has not reached the first current threshold I max2 , it is already close to the first current threshold I max2 , and the response speed of the current regulation loop is much faster than the response speed of the speed regulation loop. Therefore, the electromagnetic torque generated by the motor M can be quickly reduced by changing the current command I q * to achieve fast frequency reduction. purpose.
  • the voltage swell protection device for the PFC circuit in the frequency conversion household appliance detects the input voltage of the PFC circuit through the first voltage detection module, and detects the input current of the PFC circuit through the current detection module. And detecting, by the second voltage detecting module, an output voltage of the PFC circuit, the protection module comparing the input voltage and the output voltage to generate a first comparison result, and comparing the input current with a preset maximum allowable current to generate a second comparison
  • the PFC circuit and the motor are respectively controlled by the PFC control module and the motor controller, thereby effectively preventing the current from being excessively damaged and damaging the power switching device IGBT and the like when the voltage is swelled.
  • the device and in the case of ensuring that the device is not damaged, ensures that the PFC circuit works normally, avoids stopping the motor due to excessive protection, and improves the reliability and user experience of the frequency conversion home appliance.
  • FIG. 9 is a flow chart of a voltage swell protection method for a PFC circuit in a frequency conversion household appliance according to an embodiment of the present invention, wherein the frequency conversion household appliance includes a PFC circuit, a PFC control module that controls opening and closing of the PFC circuit, a motor, and a motor. Controller.
  • the voltage swell protection method for the PFC circuit in the frequency conversion household appliance includes the following steps:
  • the PFC control module controls the PFC circuit and controls the motor through the motor controller.
  • the motor is a compressor
  • the first protection signal is output to the PFC control module, so that the PFC control module controls the PFC circuit to be turned off. And outputting a second protection signal to the motor controller to cause the motor controller to control the motor to run down.
  • the first protection signal is output to the PFC control module, so that the PFC control module turns off the PFC circuit, and
  • the motor controller controls the motor to perform the frequency reduction operation in advance.
  • the motor controller controls the motor to operate normally according to a preset frequency when the inductance L is greater than or equal to the first preset inductance and the switching frequency of the PFC circuit is less than or equal to the first preset frequency.
  • the first preset inductance may be 0.5-1 mH, and the first preset frequency may be 15-25 KHz.
  • the first preset inductance may be 1 mH, and the first preset frequency may be 20 kHz.
  • the first protection signal when the input voltage is less than the output voltage and the input current is greater than or equal to the preset maximum allowable current, the first protection signal is output to the PFC control module, so that the PFC control module controls the PFC circuit to be turned off, and outputs The second protection signal is sent to the motor controller to cause the motor controller to control the motor to run down.
  • the PFC control module controls the PFC circuit to be turned on, and the motor controller controls the motor to operate normally according to the preset frequency.
  • the opening and closing of the PFC circuit refers to the opening and closing of a power switching device such as an IGBT in the PFC circuit.
  • the Boost type PFC circuit mainly includes an inductor L, a fast recovery diode D1, a power switching device IGBT, and an electrolytic capacitor EC.
  • the input voltage V in and the output voltage V out of the PFC circuit can be respectively obtained by a resistor voltage division method, and the input current I in of the PFC circuit is obtained by the resistance sampling method, and according to the input voltage V in the obtained PFC circuit
  • the input current I in and the output voltage V out are used to determine the switching state of the power switching device IGBT and the operating state of the motor.
  • the equivalent circuit is shown in Figure 2.
  • the voltage on the inductor L is the voltage output by the AC power source after being rectified by the diode rectifier bridge, that is, the input voltage V in . Since the input voltage V in is always greater than zero, the current flowing through the inductor L gradually rises, that is, the input current I in gradually increases; when the power switching device IGBT is in the off state, the equivalent circuit thereof is as shown in FIG. 3 .
  • voltage across the inductor L is the difference between the input voltage of the PFC circuit and the V in the output voltage V out.
  • the Boost type PFC circuit only has a boost function, under normal operating conditions, the input voltage V in of the PFC circuit is smaller than the output voltage V out , and the voltage on the inductor L is reversed. At this time, the current flowing through the inductor L will gradually The drop, that is, the input current I in gradually decreases. Therefore, in one switching cycle of the power switching device IGBT, the waveform of the input current I in is as shown in FIG.
  • the input voltage V in may exceed the output voltage V out .
  • the control power switching device IGBT is turned off, since the voltage on the inductor L (V in -V out ) is greater than zero, the flow The current through inductor L will continue to rise, as shown in Figure 6.
  • the current flowing through the inductor L rises rapidly until the over-current, as shown in FIG.
  • the time interval t 1 -t 2 shown in FIG. 7 is a time interval in which the input voltage V in is greater than the output voltage V out , and in this time interval, if the power switching device IGBT is in an on state, the input current is input. I in will rise faster.
  • the input voltage V in of the Boost-type PFC circuit is greater than the output voltage V out , in the embodiment of the present invention, the input according to the real-time detection
  • the voltage V in , the input current I in , and the output voltage V out provide protection control for the PFC circuit and the motor.
  • the detected input voltage V in is compared with the output voltage V out to output a first protection signal PFC_PRT_FLAG to the PFC control module, and the PFC control module controls the power switching device IGBT according to the first protection signal PFC_PRT_FLAG.
  • the protection of the power switching device IGBT when the input voltage V in is greater than or equal to the output voltage V out , the protection of the power switching device IGBT is turned on, the first protection signal PFC_PRT_FLAG is set to 1, and the duty ratio of the driving signal of the power switching device IGBT output by the PFC control module at this time D is 0, the PFC circuit is turned off; when the input voltage V in is smaller than the output voltage V out , the protection of the power switching device IGBT is turned off, and the first protection signal PFC_PRT_FLAG is cleared, and the driving signal of the power switching device IGBT is controlled by the PFC control module.
  • the input current I in is also judged, and outputs the second MTR_PRT_FLAG protection signal to the motor controller, the motor controller according to a second motor protection signal MTR_PRT_FLAG Take control.
  • the input current I in is greater than or equal to the preset maximum allowable current I max
  • the input speed I in is reduced by reducing the rotational speed of the motor, thereby ensuring that the motor does not stop running
  • the motor returns to the normal speed and runs at the original load.
  • the PFC circuit controls the motor according to the control logic shown in Table 1, to ensure that the PFC circuit can effectively reduce the input current I in flowing through the power switching device when the AC power supply voltage rises abruptly
  • the current of the IGBT ensures that the PFC circuit does not flow, and the motor is not stopped. Table 1 will be described in detail below with reference to specific examples.
  • This state is the normal operating state of the Boost type PFC circuit.
  • Boost function of Boost PFC circuit so that the output voltage V out is greater than the input voltage V in, and, input current I in normal operating conditions is less than the predetermined maximum permissible current I max The maximum allowed current of the power switching devices of IGBT, the When the PFC circuit is normally turned on, the motor operates normally according to the preset frequency.
  • the power switching device IGBT Assuming that the power switching device IGBT is in an on state, the amount of current rise in one switching cycle of the power switching device IGBT satisfies the above formula (1). Since the AC power source voltage suddenly rises, the input voltage V in magnitude
  • the motor controller can be used to control the motor to run down in advance or according to The preset frequency is operating normally.
  • the motor controller is required to control the motor to perform early frequency down operation, or when the PFC circuit is an IGBT.
  • the motor controller needs to control the motor to reduce the frequency in advance; and when the inductance of the inductor L is greater than or equal to 1mH
  • the motor controller controls the motor to operate normally according to the preset frequency.
  • the inductance value of the inductor L is relatively small (for example, when the switching frequency of the PFC circuit is greater than 20 kHz when the high frequency PFC circuit is used), even if the power switching device IGBT is always turned off, the rising speed of the input current I in is also Will be very fast. Further, when a relatively large electrolytic capacitor EC, the rising speed of the output voltage V out is relatively slow, it is possible to output voltage V out will be less than the input voltage V in a long period of time, this time is necessary to control the motor in advance by lowering the motor controller Frequency operation to avoid overcurrent phenomena.
  • the motor controller can control the normal operation of the motor according to the preset frequency.
  • the PFC control module is required to control the PFC circuit to be turned off, and the motor controller is controlled to reduce the frequency of the motor.
  • the power switching device IGBT is not damaged, and on the other hand, the device is overcurrent due to the diode rectifier bridge and the fast recovery diode D1.
  • the capability is much larger than the power switching device IGBT, so the motor can be operated for a further period of time by down-conversion operation. If the input current I in continues to rise, the power supply needs to be disconnected to protect the variable frequency home appliance.
  • the waveforms of the input voltage V in , the input current I in , and the output voltage V out of the protected PFC circuit are as shown in FIG. Comparison with FIG. 7, when the AC power supply voltage rises abruptly, can effectively reduce the input current I in current and power switching devices of IGBT, and to ensure non-stop operation.
  • a first current threshold I max2 may be added, which is set according to the maximum allowable current of the diode rectifier bridge and the fast recovery diode D1. set. Since the overcurrent capability of the diode rectifier bridge and the fast recovery diode D1 is much larger than that of the power switching device IGBT, the first current threshold I max2 is greater than the maximum allowable current of the power switching device IGBT, that is, the preset maximum allowable current I max . Its control logic is shown in Table 2 above.
  • the PFC circuit protection module controls the PFC circuit to be turned off, and the motor controller controls the motor to operate normally according to the preset frequency or to perform the frequency reduction operation in advance.
  • the motor controller controls the motor to perform the frequency reduction operation in advance, otherwise, the motor controller controls the motor to operate normally according to the preset frequency.
  • the power switching device IGBT When V out >V in and I max ⁇ I in ⁇ I max2 , the power switching device IGBT is first turned off to protect it from damage. In addition, since the output voltage V out is greater than the input voltage V in such that the voltage on the inductor L is reversed, the input current I in will gradually drop to a normal value, and the motor can be down-converted by reducing the rotational speed command ⁇ * so that The input current I in can quickly return to normal.
  • the control mode of the motor down- conversion operation is further determined by the preset intermediate current threshold I max21 .
  • the power switching device IGBT When V out ⁇ V in and I max ⁇ I in ⁇ I max21 , the power switching device IGBT is turned off to protect it from damage, and the motor is down- converted by reducing the rotational speed command ⁇ * ;
  • V out ⁇ V in And when I max21 ⁇ I in ⁇ I max2 the power switching device IGBT is first turned off to protect it from damage, and in addition, although the input current I in has not reached the first current threshold I max2 , it is already close to the first current threshold I Max2 , and the response speed of the current regulation loop is much faster than the response speed of the speed regulation loop. Therefore, the electromagnetic torque generated by the motor can be quickly reduced by changing the current command I q * to achieve fast frequency reduction.
  • a voltage swell protection method for a PFC circuit in a frequency conversion household appliance first detects an input voltage of a PFC circuit, detects an input current of the PFC circuit, and detects an output voltage of the PFC circuit, and then inputs the input The voltage and the output voltage are compared to generate a first comparison result, and the input current is compared with a preset maximum allowable current to generate a second comparison result, and the PFC control module pair is respectively passed according to the first comparison result and the second comparison result respectively
  • the PFC circuit controls and controls the motor through the motor controller, thereby effectively preventing the current switching device from IGBT and other devices when the voltage is suddenly increased, and ensuring the PFC while ensuring that the device is not damaged.
  • the circuit works normally to avoid the motor from being stopped due to excessive protection, which improves the reliability and user experience of the frequency conversion household appliances.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

Dispositif et procédé pour protéger une surtension d'un circuit PEC dans un appareil ménager électrique à fréquence variable, le dispositif comprenant : un premier module de détection de tension (30) utilisé pour détecter une tension d'entrée du circuit PEC ; un module de détection de courant (40) utilisé pour détecter un courant d'entrée du circuit PEC ; un second module de détection de tension (50) utilisé pour détecter une tension de sortie du circuit PEC ; un module de protection (60) utilisé pour comparer la tension d'entrée et la tension de sortie et produire un premier résultat de comparaison et comparer le courant d'entrée et un courant admissible maximal prédéfini pour produire un deuxième résultat de comparaison et commander respectivement, selon le premier résultat de comparaison et le second résultat de comparaison, le circuit PEC par l'intermédiaire d'un module de commande PEC (10) et un moteur par l'intermédiaire d'un dispositif de commande (20) de moteur. Le dispositif de protection peut empêcher le circuit PEC d'être endommagé et la machine de s'arrêter lorsqu'une surtension se produit.
PCT/CN2015/082870 2015-05-29 2015-06-30 Dispositif et procédé de protection de surtension de circuit pec dans un appareil ménager électrique à fréquence variable WO2016192160A1 (fr)

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CN111262419A (zh) * 2020-03-14 2020-06-09 广州市龙玥电气科技有限公司 一种变频器过流保护装置及变频器

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CN108199576B (zh) * 2018-01-29 2023-11-28 广东美的制冷设备有限公司 Pfc电路、电机控制系统及变频空调器
CN112600160B (zh) * 2020-12-04 2023-01-17 海信空调有限公司 Pfc电路保护装置及空调器

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