WO2017183209A1 - Dispositif de conversion de puissance - Google Patents

Dispositif de conversion de puissance Download PDF

Info

Publication number
WO2017183209A1
WO2017183209A1 PCT/JP2016/062852 JP2016062852W WO2017183209A1 WO 2017183209 A1 WO2017183209 A1 WO 2017183209A1 JP 2016062852 W JP2016062852 W JP 2016062852W WO 2017183209 A1 WO2017183209 A1 WO 2017183209A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching element
capacitor
drive circuit
circuit
power source
Prior art date
Application number
PCT/JP2016/062852
Other languages
English (en)
Japanese (ja)
Inventor
覚 寺島
清 江口
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2016/062852 priority Critical patent/WO2017183209A1/fr
Publication of WO2017183209A1 publication Critical patent/WO2017183209A1/fr

Links

Images

Classifications

    • 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

Definitions

  • the present invention relates to a power conversion device capable of detecting the state of a capacitor provided.
  • the upper arm switching element and the lower arm switching element are connected in series on both sides of the first DC power supply, and the capacitor used as the drive power supply for the upper arm switching element is connected to the second through the diode.
  • the capacitor is charged when the lower arm switching element is turned on, and the capacitor charge is consumed when the upper arm switching element is turned on.
  • Such a circuit is called a bootstrap circuit.
  • Patent Document 1 which is an example of the prior art, a technique is disclosed in which the voltage of the capacitor of the bootstrap circuit is monitored by a voltage monitoring circuit and switching is stopped when the voltage drops.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain a power conversion device that can detect the state of a capacitor in a bootstrap circuit during charging without providing a voltage monitoring circuit.
  • the present invention has one end connected to the positive electrode of the first DC power supply and the other end connected to the negative electrode of the first DC power supply.
  • a series circuit in which an element, a second switching element, and a shunt resistor are connected in series in this order; an output unit connected between the first switching element and the second switching element;
  • a second DC power source that is a power source of the first drive circuit, a capacitor that is a power source of the first drive circuit that is charged by the second DC power source when the second switching element is turned on, and the shunt resistor
  • a power converter and a control unit for detecting a state of the capacitor using a current flowing through the.
  • the power converter according to the present invention has an effect that the state of the capacitor in the bootstrap circuit can be detected during charging without providing a voltage monitoring circuit.
  • FIG. 1 is a circuit diagram showing a configuration of a power conversion device according to a first embodiment; The figure which shows the on-off pattern of the upper arm switching element and the lower arm switching element at the time of charge of the power converter device shown in FIG. The figure which shows the current pathway at the time of charge of the power converter device shown in FIG. The circuit diagram which shows the structure of the power converter device concerning Embodiment 2. FIG. The figure which shows the on-off pattern of the upper arm switching element and the lower arm switching element at the time of charge of the power converter device shown in FIG. The circuit diagram which shows the structure of the power converter device concerning Embodiment 3. FIG.
  • FIG. 1 is a circuit diagram showing a configuration of the power conversion apparatus according to the first embodiment of the present invention.
  • 1 includes a DC power source 1 that is a first DC power source, an upper arm switching element 2 that is a first switching element, a lower arm switching element 3 that is a second switching element, An upper arm side driving circuit 4 that is a first driving circuit, a lower arm side driving circuit 5 that is a second driving circuit, a DC power source 6 that is a second DC power source, a capacitor 7, and a diode 8, A shunt resistor 9. Further, the upper arm switching element 2, the lower arm switching element 3, and the shunt resistor 9 are connected in series in this order to form a series circuit 10.
  • the power converter 12 includes a control unit (not shown) that controls the first drive circuit and the second drive circuit.
  • This control unit is realized by, for example, a CPU (Central Processing Unit).
  • the upper arm side drive circuit 4 outputs a control signal to the gate of the upper arm switching element 2 to drive the upper arm switching element 2 on and off.
  • the lower arm side drive circuit 5 outputs a control signal to the gate of the lower arm switching element 3 to drive the lower arm switching element 3 on and off in a complementary manner to the upper arm switching element 2.
  • the DC power supply 6 is a power supply for the lower arm drive circuit 5, and the positive electrode of the DC power supply 6 is connected to the anode of the diode 8 and the lower arm drive circuit 5.
  • the capacitor 7 is a power source for the upper arm side drive circuit 4, one end is connected to the upper arm side drive circuit 4 and the cathode of the diode 8, and the other end is connected to the upper arm side drive circuit 4, the upper arm switching element 2, and the lower arm. It is connected between the switching element 3.
  • the diode 8 is connected in series with the DC power supply 6 and the capacitor 7.
  • the shunt resistor 9 is connected in series to the upper arm switching element 2 and the lower arm switching element 3 to detect an output current.
  • the series circuit 10 has one end connected to the positive electrode of the DC power supply 1 and the other end connected to the negative electrode of the DC power supply 1.
  • the output unit 11 is connected between the upper arm switching element 2 and the lower arm switching element 3.
  • the upper arm side drive circuit 4 turns on and off the upper arm switching element 2 by a PWM (Pulse Width Modulation) signal comparing the carrier wave and the phase voltage command.
  • the lower arm side drive circuit 5 turns on and off the lower arm switching element 3 by a PWM signal that compares the carrier wave and the phase voltage command.
  • the upper arm switching element 2 When the upper arm switching element 2 is turned on, the electric charge of the capacitor 7 is consumed as a gate power source, and the voltage of the capacitor 7 drops. Further, when the lower arm switching element 3 is turned on, the capacitor 7 is charged and the voltage of the capacitor 7 rises.
  • the upper arm switching element 2 and the lower arm switching element 3 are repeatedly turned on and off in a complementary manner, that is, alternately, and the same voltage fluctuation is repeated every one output frequency cycle. When the output is restarted after the output is stopped, that is, when the power conversion device 12 is started, the capacitor 7 is charged.
  • FIG. 2 is a diagram showing an on / off pattern of the upper arm switching element 2 and the lower arm switching element 3 when the power conversion device 12 shown in FIG. 1 is charged.
  • all of the upper arm switching element 2 and the lower arm switching element 3 are turned on all at once.
  • the present invention is not limited to this, and the upper arm switching element 2 and the lower arm switching element are switched on.
  • the timing for turning on the element 3 may be shifted for each phase.
  • it is possible to shorten the start-up time by matching the timing of turning on the upper arm switching element 2 of each phase and matching the timing of turning on the lower arm switching element 3 of each phase. Is preferable.
  • FIG. 3 is a diagram showing a current path when the capacitor 7 is charged in the power conversion device 12 shown in FIG.
  • the upper arm switching element 2 is turned on for a time T1 that is a discharge completion time, and the capacitor 7 is discharged so that the voltage of the capacitor 7 approaches 0V.
  • the lower arm switching element 3 is turned on for a time T2 that is a charging completion time to charge the capacitor 7.
  • T1 time that is a discharge completion time
  • the current i is the current value of the current flowing through the shunt resistor 9
  • the voltage Vr is the voltage value applied across the shunt resistor 9
  • the resistor R is the resistance value of the shunt resistor 9.
  • the charge Q at the time of product shipment is stored as the charge Q1 at the time of shipment.
  • the current and time at the time of charging decrease and the charge Q of the capacitor 7 decreases, so that the charge Q2 accumulated at the time of charging after the deterioration becomes smaller than the shipping charge Q1.
  • K the life coefficient
  • the voltage Vc applied across the capacitor 7 during charging is measured.
  • the voltage Vc is expressed by the following equations (4) and (5).
  • the voltage Vc is the voltage of the capacitor 7
  • the voltage Vm is the voltage of the DC power supply 6
  • the capacitance C is the capacitance of the capacitor 7
  • the resistor R is a shunt.
  • the resistance value of the resistor 9 is the total voltage value of the forward voltage of the diode 8 and the ON voltage of the lower arm switching element 3, and the current i is the current in the current path indicated by the dotted line in FIG. Value.
  • the current at the time of product shipment is stored as the current i1 (t) at the time of shipment.
  • the current and time during charging decrease, and the current i2 (t) that flows during charging after deterioration becomes smaller than the current i1 (t) at the time of shipment.
  • the controller detects the state of the capacitor represented by the estimation of the lifetime of the capacitor from the current flowing through the shunt resistor 9.
  • the life of a capacitor in a bootstrap circuit is detected using a voltage monitoring circuit that requires an operational amplifier and an isolated power supply, and such a voltage monitoring circuit must be newly provided in each phase.
  • the manufacturing cost of the power conversion device has increased.
  • the current value of the current flowing through the shunt resistor 9, the voltage value applied across the shunt resistor 9, and the resistance value of the shunt resistor 9 are measured, or the current flowing through the capacitor 7 and the supply source.
  • the lifetime of the capacitor 7 in the bootstrap circuit can be detected. Therefore, a conventional voltage monitoring circuit that requires an operational amplifier and an insulated power supply is not required, so that the power conversion device can be reduced in size and manufacturing cost can be reduced.
  • the state of the capacitor in the bootstrap circuit for example, the lifetime can be detected during charging without providing a voltage monitoring circuit.
  • the capacity of the capacitor 7 is less than the allowable value, for example, when the configuration is such that an alarm is output when the capacity is 80% or less of the capacity value at the time of shipment, the upper arm is not operated when the capacity is not detected. It is possible to prevent the loss of the switching element 2 from increasing and generating heat and failure.
  • FIG. FIG. 4 is a circuit diagram showing a configuration of the power conversion apparatus according to the second embodiment of the present invention.
  • the power converter 12a shown in FIG. 4 differs from the power converter 12 shown in FIG. 1 in that a shunt resistor 20 is provided instead of the shunt resistor 9.
  • the shunt resistor 20 is connected between the lower connection point of the series circuits 21, 21 a, 21 b that are inverter circuits and the DC power supply 1, and the output current during normal operation is derived from the bus current flowing through the shunt resistor 20. It is possible to ask.
  • the series circuit 21 includes a U-phase upper arm switching element 2 and a U-phase lower arm switching element 3, and the upper arm switching element 2 and the lower arm switching element 3 are connected to the output unit 11.
  • the series circuit 21a includes a V-phase upper arm switching element 2a and a V-phase lower arm switching element 3a, and the upper arm switching element 2a and the lower arm switching element 3a are connected to the output unit 11a.
  • the series circuit 21b includes a W-phase upper arm switching element 2b and a W-phase lower arm switching element 3b, and the upper arm switching element 2b and the lower arm switching element 3b are connected to the output unit 11b. Note that the voltage applied to the shunt resistor 20 is the voltage Vr.
  • FIG. 5 is a diagram showing an on / off pattern of the upper arm switching elements 2, 2a, 2b and the lower arm switching elements 3, 3a, 3b when the power conversion device 12a shown in FIG. 4 is charged.
  • the charging current flows at the same time, so that it is difficult to detect the life. Therefore, as shown in FIG. 5, by providing a U-phase charging period, a V-phase charging period, and a W-phase charging period, and by shifting the timing at which the lower arm switching elements 3, 3a, 3b of each phase are turned on, The charging current can be passed through the shunt resistor 20 in order.
  • the upper arm switching elements 2, 2a, 2b are turned on all at once.
  • the present invention is not limited to this, and the timing at which the upper arm switching elements 2, 2a, 2b are turned on is also included. It may be shifted. However, as shown in FIG. 5, it is preferable to match the timings at which the upper arm switching elements 2, 2a, 2b are turned on because the startup time can be shortened.
  • the lifetime is detected by using the equations (3) and (7) in the first embodiment based on the current flowing for each phase.
  • the state of the capacitor in the bootstrap circuit for example, the lifetime can be detected during charging without providing a voltage monitoring circuit.
  • the capacity of the capacitor 7 is less than the allowable value, for example, when the configuration is such that an alarm is output when the capacity is 80% or less of the capacity value at the time of shipment, the upper arm is not operated when the capacity is not detected. It is possible to prevent the loss of the switching element 2 from increasing and generating heat and failure.
  • FIG. 6 is a circuit diagram showing a configuration of the power conversion device according to the third embodiment of the present invention.
  • the power converter 12b shown in FIG. 6 includes a current limiting resistor 30 between the branch point to the lower arm side drive circuit 5 of the DC power source 6 and the diode 8, and the shunt resistor 9 is not provided in FIG. Different from the power converter 12 shown.
  • the output current during normal operation is detected by using a current detector insulated from the inverter output to the motor output.
  • the voltage Vs is a voltage value from the negative electrode of the DC power supply 6 to the anode side of the diode 8 of the current limiting resistor 30, and the voltage Vm is a power supply voltage value of the DC power supply 6. Since the voltages Vs and Vm have a common common, they can be simultaneously measured by an AD (Analog to Digital) converter.
  • AD Analog to Digital
  • the life of the capacitor which is an example of the state of the capacitor, using the equations (3) and (7) in the first embodiment by the current flowing in each phase. Perform detection.
  • the state of the capacitor in the bootstrap circuit for example, the lifetime can be detected during charging without providing a voltage monitoring circuit and a shunt resistor.
  • the capacity of the capacitor 7 is less than the allowable value, for example, when the configuration is such that an alarm is output when the capacity is 80% or less of the capacity value at the time of shipment, the upper arm is not operated when the capacity is not detected. It is possible to prevent the loss of the switching element 2 from increasing and generating heat and failure.
  • the capacity of the capacitor 7 when the capacity of the capacitor 7 is equal to or less than the allowable value, as an example, a configuration that outputs an alarm when the capacity is 80% or less of the capacity value at the time of shipment is exemplified.
  • Other configurations may alert the user.
  • it may be configured to output a warning signal to the controller and stop the activation, or a power converter may be provided with a display unit and a warning message displayed on the display unit.
  • the user can recognize that the capacitor 7 should be replaced, and can prevent a failure of the power conversion apparatus due to the deterioration of the capacitor 7.
  • the capacitor state is detected by a CPU (Central Processing Unit) (not shown) that realizes a control unit of the power conversion device.
  • a CPU Central Processing Unit
  • the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
  • 1,6 DC power supply 2, 2a, 2b upper arm switching element, 3, 3a, 3b lower arm switching element, 4 upper arm side drive circuit, 5 lower arm side drive circuit, 7 capacitor, 8 diode, 9, 20 shunt Resistance, 10, 21, 21a, 21b series circuit, 11, 11a, 11b output unit, 12, 12a, 12b power converter, 30 current limiting resistor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention a pour but d'obtenir un dispositif de conversion de puissance pouvant détecter l'état d'un condensateur sans fournir de circuit de surveillance de tension. Le dispositif de conversion de puissance est pourvu : d'un circuit en série (10) dont une extrémité est connectée à une électrode positive d'une première alimentation en courant continu (1), l'autre extrémité étant connectée à une électrode négative de la première alimentation en courant continu (1), et dont un premier élément de commutation, un second élément de commutation et une résistance shunt (9) sont connectés en série dans cet ordre ; d'une unité de sortie (11) connectée entre le premier élément de commutation et le second élément de commutation ; d'un premier circuit de commande qui commande la marche/l'arrêt du premier élément de commutation ; d'un second circuit de commande qui, de manière complémentaire, relativement au premier élément de commutation, commande la marche/l'arrêt du second élément de commutation ; d'une seconde alimentation en courant continu (6), c'est-à-dire une alimentation électrique destinée au second circuit de commande (5) ; d'un condensateur (7) destiné à être chargé au moyen de la seconde alimentation en courant continu (6) lorsque le second élément de commutation est activé. L'état du condensateur (7) est détecté à l'aide d'un courant de la résistance shunt (9).
PCT/JP2016/062852 2016-04-22 2016-04-22 Dispositif de conversion de puissance WO2017183209A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/062852 WO2017183209A1 (fr) 2016-04-22 2016-04-22 Dispositif de conversion de puissance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/062852 WO2017183209A1 (fr) 2016-04-22 2016-04-22 Dispositif de conversion de puissance

Publications (1)

Publication Number Publication Date
WO2017183209A1 true WO2017183209A1 (fr) 2017-10-26

Family

ID=60116738

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/062852 WO2017183209A1 (fr) 2016-04-22 2016-04-22 Dispositif de conversion de puissance

Country Status (1)

Country Link
WO (1) WO2017183209A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03150075A (ja) * 1989-11-07 1991-06-26 Mitsubishi Electric Corp インバータ装置の駆動回路
WO2015129043A1 (fr) * 2014-02-28 2015-09-03 三菱電機株式会社 Dispositif d'usinage par décharge électrique à fil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03150075A (ja) * 1989-11-07 1991-06-26 Mitsubishi Electric Corp インバータ装置の駆動回路
WO2015129043A1 (fr) * 2014-02-28 2015-09-03 三菱電機株式会社 Dispositif d'usinage par décharge électrique à fil

Similar Documents

Publication Publication Date Title
JP4151651B2 (ja) インバータ装置
JP6141546B1 (ja) 電力変換装置
EP2682769B1 (fr) Appareil de diagnostic de condensateur de liaison CC d'un onduleur
JP6201296B2 (ja) 電力変換装置の制御装置
JP5728914B2 (ja) インバータ装置
US20090072839A1 (en) Apparatus and method to detect failure of smoothing electrolytic capacitor
TWI467203B (zh) 蓄電器件的壽命診斷方法
JP2015208143A (ja) 電動機駆動装置
US9698712B2 (en) Inverter apparatus
JP5095530B2 (ja) 充放電システムの異常判定方法及び異常判定装置
US9608534B2 (en) Power conversion system, and voltage detection device thereof
JP2010252536A (ja) インバータ装置及びその故障診断方法
JP5223367B2 (ja) 駆動装置
CN105785136B (zh) 用于电动车辆传动系统的直流链路电容值测量
JP6869343B2 (ja) Ｄｃ／ｄｃコンバータの制御装置
JP5673114B2 (ja) インバータ装置および電動機ドライブシステム
JP6544141B2 (ja) モータ駆動装置
WO2017183209A1 (fr) Dispositif de conversion de puissance
JP2009115634A (ja) 電源システム、及び電源システムの電流計測方法
JP5282064B2 (ja) 突入電流抑制回路の故障検出機能を持つモータ駆動回路、モータ制御装置
JP2018098836A (ja) 電気回路およびその制御装置
JP6858834B1 (ja) 電力変換装置の制御装置
JP5873287B2 (ja) インバータ装置
JP6083391B2 (ja) 電動車両の電力変換装置
JP5712773B2 (ja) 電動機駆動装置

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16899481

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 16899481

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP