WO2013140874A1 - Dispositif de conversion de puissance - Google Patents

Dispositif de conversion de puissance Download PDF

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Publication number
WO2013140874A1
WO2013140874A1 PCT/JP2013/052658 JP2013052658W WO2013140874A1 WO 2013140874 A1 WO2013140874 A1 WO 2013140874A1 JP 2013052658 W JP2013052658 W JP 2013052658W WO 2013140874 A1 WO2013140874 A1 WO 2013140874A1
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WO
WIPO (PCT)
Prior art keywords
voltage
current
circuit
relays
power
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Application number
PCT/JP2013/052658
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English (en)
Japanese (ja)
Inventor
敏 井堀
正宏 平賀
雅之 広田
祐介 荒尾
良 田中
Original Assignee
株式会社日立産機システム
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Application filed by 株式会社日立産機システム filed Critical 株式会社日立産機システム
Priority to CN201380006797.XA priority Critical patent/CN104081612A/zh
Publication of WO2013140874A1 publication Critical patent/WO2013140874A1/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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions

Definitions

  • the present invention relates to a power conversion device in which a plurality of relays of the same capacity are connected in parallel to an inrush prevention suppression circuit.
  • Power converters are widely used as speed control devices for motors in industry and home appliances.
  • the voltage-type inverter which is currently the mainstream power converter, converts AC voltage to DC with a forward converter, smoothes it with a large capacity electrolytic capacitor in the DC intermediate circuit, and then AC voltage with an arbitrary frequency again with an inverter. Convert to
  • An inrush prevention circuit is provided for the purpose of protecting the rectifier diode constituting the forward converter from the charging current from the large charging current to the electrolytic capacitor in the DC intermediate circuit.
  • the inrush prevention circuit includes a resistor for suppressing current and a relay connected in parallel to the resistor.
  • the charging current to the electrolytic capacitor is suppressed by resistance, and the relay is turned on when the charging voltage of the electrolytic capacitor is fully charged. After the relay is turned on, no current flows through the resistor that suppresses the current, and all current flows through the relay. Therefore, the resistor that suppresses the current has a resistance loss until the relay is turned on. Become.
  • Patent Document 1 as a parallel contact abnormality detection device, solenoid coils that are depolarized from each other are connected in series with parallel connection points, and a contact detection signal that detects a voltage generated between each connection point is output. It is disclosed that the system can be safely stopped by detecting an abnormality in the parallel contact portion using an inrush current limiting relay.
  • Patent Document 2 detects the effective value of the voltage of the three-phase AC power input to the power converter and the DC voltage rectified by the rectifier circuit, and the DC voltage is calculated based on the effective value.
  • a power conversion device is disclosed in which a switch is closed by a control circuit when a threshold value is exceeded.
  • Patent Document 3 discloses an inverter device characterized in that a plurality of semiconductor switching elements of an inrush prevention circuit are connected in parallel.
  • an object is to provide a power conversion device that can perform the operation, and detects the abnormality of a parallel contact, and the change rate of the voltage detection value of the DC intermediate circuit is set in advance for the ON timing of the relay. There is no disclosure of what to do when it falls below the stated value.
  • paragraph [0024] describes that the set value of ⁇ V is determined based on the allowable power of the rectifier circuit 2 in the power converter, the capacity of the smoothing capacitor 6, and the like. However, there is no disclosure about the point at which the switch is turned on when the rate of change in the voltage detection value of the DC intermediate circuit composed of the smoothing capacitor becomes equal to or less than a preset value.
  • a transformer is required to detect the effective value of the voltage of the three-phase AC power input to the power converter, which again becomes a major bottleneck for downsizing the inverter device.
  • paragraph [0028] includes a load for reliably operating the thyristors 4a and 4b when the gate trigger current and the gate trigger voltage of the thyristors 4a and 4b with respect to the lower limit value of the operating temperature of the inverter device are IGT2 and VGT2, respectively.
  • the line must pass through the shaded area in FIG. 3 without interruption. In other words, it is necessary for the semiconductor switching elements 4a and 4b to ignite within a predetermined ambient temperature range of the inverter device. If the power supply voltage of the DC power supply 5 dedicated to the inrush prevention circuit is Vs, the hatched portion is interrupted. It is disclosed that the load line passing through is within the range of the load line e and the load line f, the minimum value of the gate resistance 13 is obtained from the load line e, and the maximum value of the gate resistance is obtained from the load line f. Has been.
  • the power supply voltage value and the gate resistance value are determined in consideration of the fluctuation range of the power supply voltage and the variation in resistance value.
  • the inrush prevention circuit DC power source 5 is a DC power source based on the cathode potentials of the thyristors 4a and 4b.
  • this DC power supply 5 for the inrush prevention circuit is described as using a switching power supply or using a secondary battery such as a battery like other DC power supplies used inside the inverter device, it is described.
  • An independent separate power supply must be prepared as the DC power supply 5 for the inrush prevention circuit, and this is also a bottleneck for downsizing the inverter device.
  • paragraph [0009] clearly states that the semiconductor switching element can be applied to the inrush prevention circuit of the large-capacity inverter device, and the purpose is to obtain an inexpensive and highly reliable inverter device and motor drive device. However, it does not assume a small inverter device with a small capacity.
  • Patent Document 3 does not disclose that the thyristors 4a and 4b connected in parallel are turned on when the rate of change in the voltage detection value of the DC intermediate circuit is equal to or lower than a preset value.
  • Patent Document 1 Patent Document 2 and Patent Document 3, a plurality of relays of the same capacity are connected in parallel to the resistors constituting the inrush prevention circuit, and the plurality of relays connected in parallel are used to detect the voltage of the DC intermediate circuit. There is no disclosure of a point that turns on when the rate of change of the value is equal to or lower than a preset value.
  • Patent Document 1 Regarding the parallel driving of relays or thyristors described in Patent Document 1, Patent Document 2, and Patent Document 3, none of the elements can be turned on simultaneously in terms of timing.
  • the current concentrates on the element that is turned on first in time, and ideally, the current is shared about half each when the other element is turned on with a time delay. Even in this case, if the impedances of the elements connected in parallel are not equal, the current concentrates on the element having the smaller impedance, and there is a risk of contact welding of the relay or destruction of the thyristor element, for example. For this reason, in Patent Document 1, it is possible to connect the solenoid coil in series with the parallel connection point of the relay, and to use the depolarization to make the shared current substantially uniform, but a coil that is a scroll is required. .
  • the effective value of the voltage of the three-phase AC power source input to the power converter and the DC voltage rectified by the rectifier circuit are detected, and the DC voltage is calculated based on the effective value.
  • the switch is closed by the control circuit when the threshold ⁇ V or more is reached
  • the capacitance value of the electrolytic capacitor for smoothing has a variation in the initial capacitance value with respect to the stated capacity of the component. Since the specification is ⁇ 20%, even if the capacitance is 1000 ⁇ F, the capacitance value will be a barack from 800 ⁇ F to 1200 ⁇ F. In other words, the actual capacitance value is unknown even when looking at the capacitance value described in the actual product of the smoothing electrolytic capacitor.
  • the electrolytic capacitor for smoothing has a chemical reaction inside, and its lifetime is generally called the 10 ° C half law (Arrhenius's law). Has a characteristic that the life is doubled when the temperature drops by 10 °C.
  • a smoothing electrolytic capacitor is defined as a life component, and it is difficult to accurately predict a capacity decrease due to aging.
  • the set value of ⁇ V is determined based on the allowable power of the rectifier circuit 2 in the power converter, the capacity of the smoothing capacitor 6, and the like.
  • the method of determining is not particularly specified, but it is described that it may be determined experimentally at the time of product design, for example, but the threshold voltage is considered in consideration of the initial variation of the capacitance value of the electrolytic capacitor and the capacitance decrease due to secular change. It is practically difficult to calculate ⁇ V in advance.
  • An object of the present invention is to provide a power conversion device that is miniaturized as a whole device by connecting a plurality of relays having the same capacity in parallel with a resistor constituting an inrush prevention circuit.
  • a forward converter that rectifies an alternating voltage of an alternating current power source and converts it into a direct current voltage, a direct current intermediate circuit having a smoothing capacitor that smoothes the direct current voltage of the forward converter, and the direct current intermediate circuit
  • a variable current circuit comprising: a current limiting circuit that suppresses a charging current to the smoothing capacitor; a voltage detection circuit that detects a voltage of the DC intermediate circuit; and an inverse converter that converts the DC voltage of the forward converter to an AC voltage.
  • a power converter that outputs AC power having a voltage variable frequency, wherein a plurality of relays are connected in parallel to the resistance of the source circuit, and a rate of change of a voltage detection value of the DC intermediate circuit is preset. The configuration is such that the plurality of relays are turned on when the value becomes lower than the value.
  • a plurality of relays connected in parallel to the resistance of the current-limiting circuit are turned on when the rate of change of the voltage detection value of the DC intermediate circuit is equal to or less than a preset value, Since the current flowing through each relay can be suppressed, and the current sharing ratio can be made substantially the same, a power conversion device that is downsized as a whole device can be provided.
  • FIG. 1 shows a main circuit configuration diagram of the power converter 12 according to the present embodiment.
  • 1 is a forward converter that converts AC power into DC power
  • 2 is a smoothing capacitor
  • 3 is an inverse converter that converts DC power into AC power of an arbitrary frequency
  • 4 is an AC motor.
  • Reference numeral 6 denotes a cooling fan for cooling the power semiconductor module 11 including the forward converter 1 and the reverse converter 3.
  • the digital operation panel 7 is a digital operation panel that can set, change and display various control data of the power converter 12.
  • the MCU which is a microcomputer mounted on the control circuit 5, performs calculations based on information from the storage data of the storage unit in which various control data is stored, and generates various control data input from the digital operation panel 7. It is configured to perform necessary control processing accordingly.
  • the digital operation panel 7 is configured to display an abnormality when an abnormality occurs.
  • a driver circuit 8 drives the switching element of the inverse converter.
  • an inrush prevention circuit which is composed of a resistor RB for suppressing the initial charging current to the smoothing capacitor 2 and relays RY1 and RY2 connected in parallel to the resistor.
  • RYS is the signal that turns on relays RY1 and RY2. Although the case where two relays are arranged in parallel is described, the number of relays arranged in parallel is not limited. Since the inverter which is the power converter 12 is a known technique, a detailed description thereof is omitted.
  • Figure 2 is an example of the main circuit component layout. Relays RY1 and RY2 having the same capacity with lead terminals are mounted in a soldered state on a substrate 8 on which a drive circuit is mounted.
  • a cooling fan 6 for cooling the cooling fin 6 (a dotted line portion in the figure) is mounted on the cooling fin 13 with the composite module 11 which is a collective power semiconductor in which the forward converter 1 and the reverse converter 3 are mounted in one module. ) Is a structure attached to the upper surface of the cooling fin. Since the composite module 11 configured as a collective power semiconductor generates a large loss, heat generated by this loss is conducted to the cooling fin 13 and the cooling fan 6 is used to cool the cooling fin 13.
  • a resin module case 14 on which the control circuit 5 is mounted is attached to the cooling fin 13 so as to cover the drive circuit 8 and the power semiconductor 11.
  • FIG. 3 is an example of a dimensional diagram of the relay.
  • (a) is a dimensional diagram of a relay with a rated current of 8A
  • (b) is a dimensional diagram of a relay with a rated current of 16A.
  • the volume of the relay in (a) is 10 * 20 * 15.6, and the volume of the relay in (b) is 15.7 * 30.1 * 23.3.
  • FIG. 4 is an example of a DC voltage detection circuit configuration diagram of the DC intermediate circuit.
  • the DC voltage Vpn of the DC intermediate circuit is divided by the resistors R1 and R2, the divided voltage is insulated by the insulated linear amplifier AMP, the insulated voltage is taken into the A / D converter of the microcomputer, and the rate of change of the DC voltage is calculated To do.
  • the DC voltage change rate ⁇ Vpn can be calculated by the following formula.
  • Vpn (tn) Detected DC voltage after elapse of time (tn)
  • Vpn Time (tn) to time t (n + 1) Rate of change of DC voltage until the lapse of time
  • the rate of change of DC voltage at each time from time tn to time t (n + 1) is calculated, and when this rate of change falls below a preset value,
  • the relay excitation drive circuit 15 operates, and the RYS output signal causes a current to flow through an excitation circuit (not shown) of the relays RY1 and RY2 to turn on the relays RY1 and RY2.
  • Vpn ⁇ 2 * V * [1-exp ⁇ -t / (C * R) ⁇ ] ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  • the charging voltage Vpn is determined uniquely by the effective value of the input power supply voltage Vrs by V, the capacitance value C of the smoothing capacitor 2, and the resistance value R of the current limiting resistor RB.
  • the change rate ⁇ Vpn of the charging voltage Vpn to the smoothing capacitor 2 expressed by the equation (2) is calculated and detected, and when this change rate becomes a predetermined value or less, the excitation drive circuit 15 of the relay If the is operated, current flowing through the plurality of relays can be suppressed, and welding of the contact points of the relay due to charging overcurrent to the smoothing capacitor 2 when the relay is on can be prevented.
  • FIG. 5 is an example of a transient characteristic diagram of the charging voltage Vpn to the smoothing capacitor 2.
  • the three-phase AC power input to the power converter at time to is turned on, and the charging voltage of the smoothing capacitor 2 rises according to the equation (2).
  • the charging voltage of the electrolytic capacitor according to the equation (2) is detected, it can be detected as information including the initial variation in the capacitance value of the electrolytic capacitor and the capacitance drop due to aging.
  • the set value of ⁇ V disclosed in paragraph [0024] of Patent Document 2 is the rectifier circuit in the power converter. 2 is determined based on the allowable power of 2 and the capacity of the smoothing capacitor 6, for example, it may be determined experimentally during product design, but the voltage detection value of the DC intermediate circuit that is the voltage across the electrolytic capacitor By detecting the rate of change, it is possible to consider all initial variations in the capacitance value of the electrolytic capacitor and capacitance reduction due to aging, and it is not necessary to determine experimentally at the time of product design.
  • the voltage of the DC intermediate circuit is detected every predetermined detection time ⁇ t, the change rate ⁇ Vpn of the DC intermediate circuit at time tn and time t (n + 1) is calculated, and this change rate is a preset value ⁇ Vd At time t (n + 1) when the following occurs, the excitation drive circuit 15 of the relay operates, and the RYS output signal causes a current to flow through the excitation circuit (not shown) of the relays RY1 and RY2 to turn on the relays RY1 and RY2. It is a configuration.
  • FIG. 6 is an example of a copper foil pattern diagram on the substrate.
  • the current I flowing into the relays RY1 and RY2 is inversely proportional to the impedance from the inflow point to the outflow point, that is, the wiring length of the copper foil pattern. If the cross-sectional areas of the copper foil patterns are the same, the longer the wiring length, the higher the impedance and the smaller the current, and the shorter the wiring length, the smaller the impedance and the larger the current.
  • a large amount of current flows through the relay RY1 with a short copper foil pattern (0.7I: 70%), and a small current (0.3I: 30%) through the relay RY2 with a long copper foil pattern.
  • current sharing between relays RY1 and RY2 becomes unbalanced. In this case, the inflowing current concentrates on the relay RY1, resulting in exceeding the rated current specification, which causes destruction such as contact welding of the relay RY1.
  • the total impedance of the current inflow side copper foil pattern and the current outflow side copper foil pattern from the current inflow and outflow points to the lead electrode terminals of the relays RY1 and RY2 is approximately the same for each relay RY1 and RY2. If the mounting is performed in consideration of the copper foil pattern and the lead terminal arrangement of the relay, the sharing of the current flowing through the relays RY1 and RY2 connected in parallel can be made uniform.
  • relays RY1 and RY2 connected in parallel can be fully utilized.
  • the case where there are two relays in parallel is described, but the number of relays in parallel is not limited.
  • FIG. 7 is another example of a copper foil pattern diagram on the substrate.
  • (A) and (b) are examples of copper foil patterns in which the sharing of the current flowing through the relays RY1 and RY2 connected in parallel is balanced.
  • (a) shows the pattern wiring length from the branch point of the current inflow side wiring to RY1 and RY2 connected in parallel to the current outflow connection point to RY2 and the branch point of the current inflow side of RY1 to RY1. This is the case of the copper foil pattern where the pattern wiring length to the current flow connection point is approximately the same.
  • (B) is from the branch point of the current inflow side wiring to RY1 and RY2 connected in parallel to RY2.
  • the ratio of the wiring length and cross-sectional area of the pattern up to the current outflow connection point and the ratio of the wiring length and cross-sectional area of the pattern from the branch point of the wiring on the current inflow side of RY1 to the current flow connection point to RY1 are substantially the same It is an example at the time of setting it as the copper foil pattern which becomes.
  • This resistivity ⁇ is a constant uniquely determined by the material, for example, for copper: 1.72 ⁇ 10 ⁇ -6 ohm ⁇ cm, for silver: 1.62 ⁇ 10 ⁇ -6 ohm ⁇ cm. Therefore, once the material is determined, the impedance Z of the wiring pattern is determined by the ratio of the wiring length L and the cross-sectional area S (product of the pattern width and the pattern thickness), that is, Z ⁇ L / S. That is, if the cross-sectional area S is doubled, the impedance Z becomes the same even if the wiring length is doubled.
  • the impedance Z of the copper foil pattern can be made equal.
  • An example is (a).
  • the impedance Z of the copper foil pattern can be made equal if the wiring length L of the copper foil pattern and the ratio of the cross-sectional area S are designed to be substantially the same.
  • An example in this case is (b). Even in this case, the sharing of the current flowing through the relays RY1 and RY2 connected in parallel can be made uniform.
  • the copper foil pattern on the substrate can be provided on both the front surface and the back surface of the substrate.
  • the ratio of the wiring length and cross-sectional area of the pattern provided on the front surface and the wiring length of the pattern provided on the back surface It may be considered that the ratio of the cross-sectional areas is parallel, and the same applies to the case where a pattern is provided on the inner layer of the substrate.
  • (a) and (b) are one example and do not limit the copper foil pattern on the substrate.
  • This embodiment describes the case where there are two relays in parallel, but the number of relays in parallel is not limited.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Rectifiers (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

L'invention concerne un dispositif de conversion de puissance pour produire une puissance CA ayant une tension variable et une fréquence variable, le dispositif de conversion de puissance comprenant : un convertisseur direct servant à redresser et convertir une tension CA d'une source de puissance CA en une tension CC ; un circuit intermédiaire CC possédant un condensateur de lissage servant à lisser la tension CC du convertisseur direct ; un circuit de limitation de courant servant à réduire le courant de charge entrant dans le condensateur de lissage du circuit intermédiaire CC ; un circuit de détection de tension servant à détecter la tension du circuit intermédiaire CC ; et un convertisseur inverse servant à convertir la tension CC du convertisseur direct en tension CA. Les relais d'une pluralité de relais sont connectés en parallèle à une résistance du circuit de limitation de courant, et les relais de la pluralité de relais sont activés lorsque la vitesse de variation de la valeur de détection de tension du circuit intermédiaire CC est égale ou inférieure à une valeur prédéfinie.
PCT/JP2013/052658 2012-03-23 2013-02-06 Dispositif de conversion de puissance WO2013140874A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380006797.XA CN104081612A (zh) 2012-03-23 2013-02-06 电力转换装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012066534A JP5814841B2 (ja) 2012-03-23 2012-03-23 電力変換装置
JP2012-066534 2012-03-23

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WO2013140874A1 true WO2013140874A1 (fr) 2013-09-26

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JP (1) JP5814841B2 (fr)
CN (1) CN104081612A (fr)
WO (1) WO2013140874A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109286326A (zh) * 2018-10-18 2019-01-29 珠海格力电器股份有限公司 大功率变频扩展电路、控制方法、装置和变频驱动板

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3379712B1 (fr) * 2015-11-18 2020-07-29 Hitachi Industrial Equipment Systems Co., Ltd. Dispositif de conversion de puissance
FR3061812B1 (fr) * 2017-01-11 2022-06-10 Caly Tech Dispositif de protection d'un equipement electrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02246778A (ja) * 1989-03-17 1990-10-02 Mitsubishi Electric Corp インバータ装置の突入電流防止回路
JP2000059988A (ja) * 1998-08-10 2000-02-25 Sanken Electric Co Ltd 突入電流防止回路
JP2001112265A (ja) * 1999-10-06 2001-04-20 Hitachi Ltd インバータ装置及び電動機駆動装置
JP2008210944A (ja) * 2007-02-26 2008-09-11 Toshiba Tec Corp 大電流を通電可能な等長配線を備える配線基板
JP2010110085A (ja) * 2008-10-29 2010-05-13 Daikin Ind Ltd インバータ装置及びそれを用いた空調機

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5317188B2 (ja) * 2009-02-20 2013-10-16 株式会社安川電機 電動車両のインバータ装置及びその保護方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02246778A (ja) * 1989-03-17 1990-10-02 Mitsubishi Electric Corp インバータ装置の突入電流防止回路
JP2000059988A (ja) * 1998-08-10 2000-02-25 Sanken Electric Co Ltd 突入電流防止回路
JP2001112265A (ja) * 1999-10-06 2001-04-20 Hitachi Ltd インバータ装置及び電動機駆動装置
JP2008210944A (ja) * 2007-02-26 2008-09-11 Toshiba Tec Corp 大電流を通電可能な等長配線を備える配線基板
JP2010110085A (ja) * 2008-10-29 2010-05-13 Daikin Ind Ltd インバータ装置及びそれを用いた空調機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109286326A (zh) * 2018-10-18 2019-01-29 珠海格力电器股份有限公司 大功率变频扩展电路、控制方法、装置和变频驱动板

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CN104081612A (zh) 2014-10-01
JP2013198383A (ja) 2013-09-30

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