WO2019239469A1 - Convertisseur - Google Patents

Convertisseur Download PDF

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Publication number
WO2019239469A1
WO2019239469A1 PCT/JP2018/022280 JP2018022280W WO2019239469A1 WO 2019239469 A1 WO2019239469 A1 WO 2019239469A1 JP 2018022280 W JP2018022280 W JP 2018022280W WO 2019239469 A1 WO2019239469 A1 WO 2019239469A1
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WO
WIPO (PCT)
Prior art keywords
voltage
phase
terminal
signal
wiring
Prior art date
Application number
PCT/JP2018/022280
Other languages
English (en)
Japanese (ja)
Inventor
良知 林
聡 小塚
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/JP2018/022280 priority Critical patent/WO2019239469A1/fr
Priority to JP2019528930A priority patent/JP6608096B1/ja
Priority to PCT/JP2019/003034 priority patent/WO2019239628A1/fr
Priority to CN201980037731.4A priority patent/CN112219348A/zh
Priority to TW108119130A priority patent/TWI705647B/zh
Publication of WO2019239469A1 publication Critical patent/WO2019239469A1/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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc 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
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • 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 present invention relates to a converter that converts AC power into DC power.
  • converters using a power regeneration system that returns regenerative power to an AC power source as an input power source are often used for energy saving.
  • the converter using the power regeneration system operates as a DC / AC converter that converts DC power supplied from the motor drive device to AC power during motor regeneration, thereby converting the regenerative power generated by the motor into AC. Return to power.
  • the operation of the converter that returns the regenerative power to the AC power supply is referred to as a regenerative operation.
  • the regenerative operation if the timing at which the switching elements constituting the converter are turned on deviates from the voltage phase of the AC power supply, the voltage difference increases, and an excessive current may flow to stop the motor drive device.
  • the voltage phase of the AC power supply is detected, and a drive signal that controls the on / off operation of the switching element during the regenerative operation is generated based on the detected phase information.
  • the voltage phase of the AC power supply may be simply referred to as a voltage phase.
  • a voltage phase detection method a method of detecting a zero cross point of a line voltage of an AC power supply and detecting a voltage phase based on the detected zero cross point is common.
  • the zero cross point is a timing at which the voltage becomes zero when the line voltage of the AC power source changes from negative to positive or from positive to negative.
  • Patent Document 1 discloses a technique for detecting the voltage phase of the AC power supply by the zero crossing of the phase voltage.
  • a phase detection unit that detects the voltage phase of the AC power supply is connected to the AC terminal of the power regeneration converter, and the voltage phase of the AC power supply is detected by the phase detection unit.
  • the phase detector is mounted on a printed circuit board provided in the power regeneration converter. According to the technique disclosed in Patent Literature 1, since the voltage phase of the AC power supply is detected by the zero cross of the phase voltage, a phase detection signal that alternately changes between a high level and a low level between the zero cross points is generated. .
  • the timing at which the level of the phase detection signal changes can be made different from the timing at which the switching element is turned on or off. As a result, voltage phase detection can be performed without being affected by spike-like distortion of the power supply voltage caused by the on / off operation of the switching element.
  • the phase of the AC voltage applied between the AC power supply terminal of the power regeneration converter and the AC power supply terminal of the power module configured by a plurality of switching elements is detected by the phase detection unit. Detected.
  • This AC voltage is a voltage applied to the pattern (copper foil) on the printed circuit board.
  • the converter capacity increases depending on the pattern on the printed circuit board. It becomes difficult to supply power. Therefore, generally, in a large-capacity converter, power is supplied using a conductor such as a bus bar.
  • a harness is connected to the bus bar, for example, in order to detect the phase of the AC voltage in the phase detection unit provided on the printed circuit board.
  • the phase detector detects the AC voltage phase via the harness, there is a problem that the structure becomes complicated.
  • the present invention has been made in view of the above, and an object thereof is to obtain a converter capable of detecting the voltage phase of an AC power supply with a simple configuration.
  • a converter according to the present invention is disposed between an AC power source that is an input power source and a motor driving device that performs variable speed control of the motor, and supplies DC power to the motor driving device.
  • a converter having a power regeneration function for supplying regenerative power when the motor decelerates to the AC power supply an AC terminal connected to the AC power supply, a first terminal connected to a high potential side DC wiring, A power module having a plurality of switching elements, and a drive circuit for driving each of the plurality of switching elements.
  • the converter includes a control power supply unit that generates electric power supplied to the plurality of switching elements and electric power supplied to the drive circuit, a signal that flows to the emitters of the plurality of switching elements connected to the first terminal, or a control power supply
  • a voltage phase detection unit that detects a voltage phase of the AC voltage based on a signal flowing in the ground serving as a reference potential of the unit, generates a phase detection signal indicating the detected voltage phase, and outputs the phase detection signal.
  • the converter includes a drive signal generation unit that generates a drive signal for controlling the on / off operation of the plurality of switching elements based on the phase detection signal.
  • the converter according to the present invention has an effect that the voltage phase of the AC power supply can be detected with a simple configuration.
  • the figure which shows the structural example of the regeneration control part shown in FIG. 1 is a diagram illustrating a configuration example of a base drive circuit illustrated in FIG.
  • the figure which shows the structural example of the 1st voltage application part shown in FIG. The figure which shows the structural example of the 2nd voltage application part shown in FIG.
  • movement of the voltage phase detection part shown in FIG. The figure for demonstrating the operation
  • the figure which shows the structural example of the voltage phase detection part shown in FIG. The figure which shows the waveform of the R phase phase detection signal produced
  • FIG. 1 is a diagram showing a configuration of a converter according to Embodiment 1 of the present invention.
  • converter 1-1 according to the first embodiment is provided between an AC power supply 3 that is a three-phase AC power supply that generates a three-phase AC voltage and a motor drive device 4.
  • the converter 1-1 converts the AC voltage from the AC power source 3 that generates a three-phase AC voltage during powering of the motor into a DC voltage and outputs the DC voltage to the motor driving device 4.
  • the motor driving device 4 receives the DC voltage supplied from the converter 1-1 and controls the motor 5 at a variable speed.
  • the converter 1-1 includes a smoothing capacitor 21, a power module 22, a bus voltage detector 23, a voltage phase detector 24, a bus current detector 25, and a base drive signal generator 26 that is a drive signal generator.
  • a base drive circuit 27 that is a drive circuit, a regeneration control unit 28 that is a signal control unit, and a control power supply unit 29.
  • the power module 22 includes three AC terminals 11, 12, 13, a DC terminal 14 that is a first terminal to which a high potential side DC wiring is connected, and a second terminal to which a low potential side DC wiring is connected. A certain DC terminal 15 is provided.
  • the AC terminal 11 is connected to one end of the AC wiring 51.
  • the other end of the AC wiring 51 is connected to one end of the reactor 2-1.
  • the other end of the reactor 2-1 is connected to one end of an AC wiring 91.
  • the other end of the AC wiring 91 is connected to the terminal 3 ⁇ / b> R of the AC power supply 3.
  • the terminal 3R is a terminal from which an R-phase AC voltage is output.
  • the R-phase AC voltage is applied to the AC terminal 11 via the reactor 2-1.
  • AC terminal 12 is connected to one end of AC wiring 52.
  • the other end of the AC wiring 52 is connected to one end of the reactor 2-2.
  • the other end of the reactor 2-2 is connected to one end of the AC wiring 92.
  • the other end of the AC wiring 92 is connected to the terminal 3 ⁇ / b> S of the AC power supply 3.
  • the terminal 3S is a terminal from which an S-phase AC voltage is output. The S-phase AC voltage is applied to the AC terminal 12 via the reactor 2-2.
  • AC terminal 13 is connected to one end of AC wiring 53.
  • the other end of the AC wiring 53 is connected to one end of the reactor 2-3.
  • the other end of the reactor 2-3 is connected to one end of the AC wiring 93.
  • the other end of the AC wiring 93 is connected to the terminal 3T of the AC power source 3.
  • the terminal 3T is a terminal from which a T-phase AC voltage is output.
  • the T-phase AC voltage is applied to the AC terminal 13 via the reactor 2-3.
  • the reactors 2-1, 2-2, and 2-3 may be referred to as a reactor 2 when they are not distinguished.
  • the DC terminal 14 is connected to one end of a positive electrode bus 70P which is a DC wiring on the high potential side.
  • the other end of positive bus 70P is connected to output terminal 6-1 of converter 1-1.
  • the output terminal 6-1 is a high potential side DC terminal.
  • One end of the positive electrode bus 71P is connected to the output terminal 6-1.
  • the positive bus 71P is a high potential side DC wiring provided between the converter 1-1 and the motor driving device 4.
  • the other end of the positive electrode bus 71 ⁇ / b> P is connected to the DC terminal 17 of the motor driving device 4.
  • the DC terminal 17 is a high potential side DC terminal.
  • the DC terminal 14 of the power module 22 is electrically connected to the DC terminal 17 of the motor driving device 4 via the positive electrode bus 70P, the output terminal 6-1 and the positive electrode bus 71P.
  • the DC terminal 15 is connected to one end of a negative electrode bus 70N which is a DC wiring on the low potential side.
  • the other end of the negative electrode bus 70N is connected to the output terminal 6-2 of the converter 1-1.
  • the output terminal 6-2 is a DC terminal on the low potential side.
  • One end of the negative electrode bus 71N is connected to the output terminal 6-2.
  • the negative electrode bus 71N is a low potential side DC wiring provided between the converter 1-1 and the motor driving device 4.
  • the other end of the negative electrode bus 71N is connected to the DC terminal 18 of the motor driving device 4.
  • the DC terminal 18 is a DC terminal on the low potential side.
  • the DC terminal 15 of the power module 22 is electrically connected to the DC terminal 18 of the motor driving device 4 through the negative electrode bus 70N, the output terminal 6-2, and the negative electrode bus 71N.
  • the terminal 21a on the high potential side of the smoothing capacitor 21 is connected to the positive electrode bus 70P.
  • Reference numeral 80P represents a connection point between the high potential side terminal 21a of the smoothing capacitor 21 and the positive electrode bus 70P.
  • the low potential side terminal 21b of the smoothing capacitor 21 is connected to the negative electrode bus 70N.
  • reference numeral 80N represents a connection point between the low potential side terminal 21b of the smoothing capacitor 21 and the negative electrode bus 70N.
  • the power module 22 includes six rectifying elements D 1, D 2, D 3, D 4, D 5, D 6 and 6 switching elements S 1, S 2 for regeneration. , S3, S4, S5, and S6.
  • the six rectifying elements D1, D2, D3, D4, D5, and D6 may be referred to as rectifying elements D1 to D6, and the switching elements S1, S2, S3, S4, S5, and S6 may be referred to as switching elements S1 to S6. is there.
  • the rectifying element D1 is connected in antiparallel to the switching element S1. Specifically, the cathode that is the cathode of the rectifying element D1 is connected to the collector of the switching element S1, and the anode that is the anode of the rectifying element D1 is connected to the emitter of the switching element S1.
  • the rectifying element D1 and the switching element S1 constitute one power element.
  • the rectifier element D2 and the switching element S2 constitute a power element
  • the rectifier element D3 and the switching element S3 constitute a power element
  • the rectifier element D4 and the switching element S4 constitute a power element
  • the rectifier element D5 and the switching element The power element is configured by the element S5, and the power element is configured by the rectifying element D6 and the switching element S6.
  • each of the rectifier elements D1 to D6 for example, a diode, a Schottky barrier diode, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), or the like is used.
  • Each of the six rectifying elements D1, D2, D3, D4, D5, and D6 may be any element having a rectifying action, and is not limited to these elements.
  • Switching element S1 and switching element S2 are connected in series by wiring 8-1.
  • the switching element S1, the switching element S2, the rectifying element D1, the rectifying element D2, and the wiring 8-1 constitute a first arm.
  • One end of the wiring 8-1 is connected to the emitter of the switching element S1.
  • the other end of the wiring 8-1 is connected to the collector of the switching element S2.
  • One end of the wiring 9-1 is connected to the wiring 8-1.
  • Reference numeral 501 represents a connection point between the wiring 8-1 and the wiring 9-1.
  • the other end of the wiring 9-1 is connected to the AC terminal 11. Thereby, the emitter of the switching element S1 and the collector of the switching element S2 are electrically connected to the AC terminal 11.
  • the rectifying element D1 and the switching element S1 constitute a power element for an R-phase positive electrode
  • the rectifying element D2 and switching element S2 constitute a power element for an R-phase negative electrode.
  • the collector of the switching element S1 is connected to the DC terminal 14 via the wiring 9-4.
  • the emitter of the switching element S2 is connected to the DC terminal 15 via the wiring 9-5.
  • Switching element S3 and switching element S4 are connected in series by wiring 8-2.
  • Switching element S3, switching element S4, rectifying element D3, rectifying element D4, and wiring 8-2 constitute a second arm.
  • One end of the wiring 8-2 is connected to the emitter of the switching element S3.
  • the other end of the wiring 8-2 is connected to the collector of the switching element S4.
  • One end of the wiring 9-2 is connected to the wiring 8-2.
  • Reference numeral 502 represents a connection point between the wiring 8-2 and the wiring 9-2.
  • the other end of the wiring 9-2 is connected to the AC terminal 12.
  • the rectifying element D3 and the switching element S3 constitute a power element for the S-phase positive electrode, and the rectifying element D4 and switching element S4 constitute an S-phase negative power element.
  • the collector of the switching element S3 is connected to the DC terminal 14 via the wiring 9-4.
  • the emitter of the switching element S4 is connected to the DC terminal 15 through the wiring 9-5.
  • Switching element S5 and switching element S6 are connected in series by wiring 8-3.
  • Switching element S5, switching element S6, rectifying element D5, rectifying element D6 and wiring 8-3 constitute a third arm.
  • One end of the wiring 8-3 is connected to the emitter of the switching element S5.
  • the other end of the wiring 8-3 is connected to the collector of the switching element S6.
  • One end of the wiring 9-3 is connected to the wiring 8-3.
  • Reference numeral 503 represents a connection point between the wiring 8-3 and the wiring 9-2.
  • the other end of the wiring 9-3 is connected to the AC terminal 13. Thereby, the emitter of switching element S5 and the collector of switching element S6 are electrically connected to AC terminal 13.
  • the rectifying element D5 and the switching element S5 constitute a power element for a T-phase positive electrode, and the rectifying element D6 and switching element S6 constitute a T-phase negative power element.
  • the collector of the switching element S5 is connected to the DC terminal 14 via the wiring 9-4.
  • the emitter of the switching element S6 is connected to the DC terminal 15 via the wiring 9-5.
  • the DC terminal 14 is electrically connected to the collectors of the switching element S1, the switching element S3, and the switching element S5 that constitute the upper arm.
  • the DC terminal 15 is electrically connected to the emitters of the switching element S2, the switching element S4, and the switching element S6 constituting the lower arm.
  • the DC terminal 14 and the DC terminal 15 of the power module 22 are connected to a series circuit composed of a switching element S1 and a switching element S2, a series circuit composed of a switching element S3 and a switching element S4, a switching element S5 and a switching element.
  • the series circuit constituted by S6 is connected in parallel.
  • the converter 1-1 according to the first embodiment is connected to the three-phase AC power supply 3, but a single-phase AC power supply may be connected instead of the three-phase AC power supply 3. When a single-phase AC power supply is connected, the power module 22 has four power elements.
  • the bus voltage detector 23 detects the voltage applied to the terminals 21a and 21b of the smoothing capacitor 21, and outputs voltage information indicating the detected voltage as the bus voltage VPN .
  • the terminal 21a of the smoothing capacitor 21 is connected to the DC terminal 14 of the power module 22 via the positive electrode bus 70P, and the terminal 21b of the smoothing capacitor 21 is connected to the DC terminal 15 of the power module 22 via the negative electrode bus 70N. Therefore, the voltage applied to the terminals 21 a and 21 b of the smoothing capacitor 21 is equal to the voltage applied to the DC terminals 14 and 15 of the power module 22.
  • the bus bar current detection unit 25 is provided between the DC terminal 14 and the connection point 80P, for example, on the positive bus 70P.
  • the bus current detection unit 25 detects a current flowing through the positive bus 70P, and outputs current information indicating the detected current as a bus current IPN .
  • the bus current detection unit 25 may be a current sensor using an instrumental current transformer called CT (Current Transformer), or may be a current sensor using a shunt resistor.
  • CT Current Transformer
  • the bus current detector 25 may be a combination of these.
  • the bus current detection unit 25 may be provided between the DC terminal 15 and the connection point 80N on the negative electrode bus 70N to detect a current flowing through the negative electrode bus 70N.
  • the control power supply unit 29 generates power for driving the switching elements S1 to S6 of the power module 22 and power for driving the base drive circuit 27.
  • the emitter of the switching element S1 is connected to the R phase of the AC power supply 3 via the reactor 2-1
  • the emitter of the switching element S3 is connected to the S of the AC power supply 3 via the reactor 2-2
  • the emitter of the switching element S5 is connected to the T phase of the AC power supply 3 via the reactor 2-3. Therefore, in order to drive each of the switching elements S1, S3, and S5 arranged on the positive electrode side, the base drive circuit 27 sets the ground of the drive signal generation circuit that drives each of the switching elements S1, S3, and S5. It is necessary to divide.
  • the emitters of the switching elements S2, S4, S6 arranged on the negative electrode side are connected to the DC terminal 15 of the power module 22, they serve as reference potentials for the emitters of the switching elements S2, S4, S6.
  • the ground is the same. Therefore, in the base drive circuit 27, the ground of the drive signal generation circuit for driving the switching elements S2, S4, S6 arranged on the negative electrode side can be made the same. Therefore, in order to operate the base drive circuit 27, at least four insulated power supplies are required.
  • FIG. 2 is a diagram showing a configuration example of the control power supply unit shown in FIG.
  • the control power supply unit 29 includes a main power supply 31, a power supply control IC (Integrated Circuit) 32, a switching element 33, an insulating transformer 30, a plurality of rectifier elements D21, D22, D23, and D24. , Capacitors C21, C22, C23, C24, and a feedback unit 34.
  • IC Integrated Circuit
  • the insulating transformer 30 includes a primary winding N11 and a plurality of secondary windings N21, N22, N23, and N24. Each of the plurality of secondary windings N21, N22, N23, N24 is insulated between adjacent windings.
  • the power supply control IC 32 includes a power supply terminal VCC, a feedback terminal FB, a gate signal output terminal SW, and a ground terminal GND.
  • the positive terminal of the main power supply 31 is connected to the winding start side terminal of the primary winding N11 and the power supply terminal VCC of the power supply control IC 32.
  • the winding end side terminal of the primary winding N11 is connected to the drain terminal D of the switching element 33.
  • the source terminal S of the switching element 33 is connected to the negative terminal of the main power supply 31 and the GND terminal of the power supply control IC 32.
  • the gate G of the switching element 33 is connected to the SW terminal of the power supply control IC 32.
  • the anode of the rectifying element D21 is connected to the winding end side terminal of the secondary winding N21, and the cathode of the rectifying element D21 is connected to one end of the capacitor C21.
  • the other end of the capacitor C21 is connected to the winding start side terminal of the secondary winding N21 via the wiring 291.
  • One end of the wiring 291-1 is connected to a connection point between the cathode of the rectifying element D21 and one end of the capacitor C21.
  • One end of the wiring 291-2 is connected to a connection point between the other end of the capacitor C21 and the wiring 291.
  • a ground VRPGND serving as a reference potential of the voltage VRP generated in the wiring 291-1 is connected to the wiring 291-2.
  • the voltage VRP is equal to the voltage applied between one end and the other end of the capacitor C21.
  • the other ends of the wirings 291-1 and 291-2 are connected to the base drive circuit 27 shown in FIG.
  • the anode of the rectifying element D22 is connected to the winding end side terminal of the secondary winding N22, and the cathode of the rectifying element D22 is connected to one end of the capacitor C22.
  • the other end of the capacitor C22 is connected to the winding start side terminal of the secondary winding N22 via the wiring 292.
  • One end of the wiring 292-1 is connected to a connection point between the cathode of the rectifying element D22 and one end of the capacitor C22.
  • One end of the wiring 292-2 is connected to the connection point between the other end of the capacitor C22 and the wiring 292.
  • a ground VSPGND which is a reference potential of the voltage VSP generated in the wiring 292-1 is connected to the wiring 292-2.
  • the voltage VSP is equal to the voltage applied between one end and the other end of the capacitor C22.
  • the other ends of the wiring 292-1 and the wiring 292-2 are connected to the base drive circuit 27 shown in FIG.
  • the anode of the rectifying element D23 is connected to the winding end side terminal of the secondary winding N23, and the cathode of the rectifying element D23 is connected to one end of the capacitor C23.
  • the other end of the capacitor C23 is connected to the winding start side terminal of the secondary winding N23 via the wiring 293.
  • One end of the wiring 293-1 is connected to a connection point between the cathode of the rectifying element D23 and one end of the capacitor C23.
  • One end of the wiring 293-2 is connected to the connection point between the other end of the capacitor C23 and the wiring 293.
  • the wiring 293-2 is connected to a ground VTPGND that serves as a reference potential of the voltage VTP generated in the wiring 293-1.
  • the voltage VTP is equal to the voltage applied between one end and the other end of the capacitor C23.
  • the anode of the rectifying element D24 is connected to the winding end side terminal of the secondary winding N24, and the cathode of the rectifying element D24 is connected to one end of the capacitor C24.
  • the other end of the capacitor C24 is connected to the winding start side terminal of the secondary winding N24 via the wiring 294.
  • One end of the wiring 294-1 is connected to a connection point between the cathode of the rectifying element D24 and one end of the capacitor C24.
  • One end of the wiring 294-2 is connected to a connection point between the other end of the capacitor C24 and the wiring 294.
  • the wiring 294-2 is connected to the ground VNGGND that serves as a reference potential for the voltage VN generated in the wiring 294-1.
  • the voltage VN is equal to the voltage applied between one end and the other end of the capacitor C24.
  • the voltage VN is input to the feedback unit 34.
  • a photocoupler is used for the feedback unit 34.
  • the feedback unit 34 sets the voltage VN to a voltage value that can be handled by the power supply control IC 32 in a state where the FB terminal of the power supply control IC 32 and the secondary winding N24 are insulated.
  • the voltage value after conversion is input to the FB terminal of the power supply control IC 32.
  • the number of turns of each of the secondary windings N21, N22, and N23 is made equal to the number of turns of the secondary winding N24, so that the voltage generated in each of the capacitors C21, C22, and C23 is the capacitor C24. Is almost equal to the voltage generated in
  • the operation of the control power supply unit 29 will be described.
  • the power supply control IC 32 generates a control signal for controlling the on / off operation of the switching element 33 based on the voltage VN output from the feedback unit 34.
  • the power supply control IC 32 outputs the generated control signal from the SW terminal, and the output control signal is input to the gate G of the switching element 33.
  • the switching element 33 repeats the on / off operation, and the value of the voltage VN input to the feedback unit 34 is maintained at a specific value.
  • the voltage phase detector 24 shown in FIG. 1 detects the voltage phase of the AC power supply 3, and outputs phase information indicating the detected voltage phase to the base drive signal generator 26 as a phase detection signal.
  • the phase detection signal is a signal that takes a high level or low level potential. The voltage phase detection method by the voltage phase detector 24 and details of the phase detection signal will be described later.
  • the base drive signal generator 26 Based on the phase detection signal output from the voltage phase detector 24, the base drive signal generator 26 has six types of base drive signals SRP, SRN, SSP, SSN, STP, for driving the switching elements S1 to S6.
  • An STN is generated and output to the regeneration control unit 28.
  • Each of the six types of base drive signals SRP, SRN, SSP, SSN, STP, and STN is a signal that takes a High level or Low level potential.
  • the base drive signal SRP is a signal for driving the switching element S1 for the positive side of the R phase.
  • the base drive signal SRN is a signal for driving the switching element S2 for the negative side of the R phase.
  • the base drive signal SSP is a signal for driving the switching element S3 for the positive side of the S phase.
  • the base drive signal SSN is a signal for driving the switching element S4 for the negative side of the S phase.
  • the base drive signal STP is a signal for driving the switching element S5 for the positive side of the T phase.
  • the base drive signal STN is a signal for driving the switching element S6 for the negative side of the T phase.
  • the six types of base drive signals SRP, SRN, SSP, SSN, STP, and STN may be referred to as base drive signals SRP to STN.
  • the regeneration control unit 28 continues to transmit the base drive signal SRP output from the base drive signal generation unit 26 to the base drive circuit 27 of the STN or It is determined whether to stop the transmission of the STN from the base drive signal SRP output from the drive signal generator 26 to the base drive circuit 27. If the regeneration control unit 28 determines that the transmission of the STN from the base drive signal SRP to the base drive circuit 27 is continued, the STN is continuously input to the base drive circuit 27 from the base drive signal SRP. When the regeneration control unit 28 determines that the transmission of the STN from the base drive signal SRP to the base drive circuit 27 is stopped, the input of the STN from the base drive signal SRP to the base drive circuit 27 is stopped.
  • FIG. 3 is a diagram illustrating a configuration example of the regeneration control unit illustrated in FIG. 1.
  • the regeneration control unit 28 includes a regeneration start determination unit 60, a regeneration stop determination unit 61, an OR circuit 62, and an NPN transistor 63.
  • the bus voltage VPN is input to the regeneration start determination unit 60 in the regeneration start determination unit 60.
  • Regeneration start determination unit 60 based on the bus voltage V PN, provided with a function of determining whether to initiate a regeneration operation by the power module 22 shown in FIG.
  • the regeneration start determination unit 60 includes a subtracter 64 and a comparator 65.
  • the subtractor 64 receives the bus voltage VPN and the reference voltage Vref.
  • the reference voltage Vref is a voltage set in advance based on the voltage of the AC power supply 3.
  • the reference voltage Vref is generated by detecting the voltage of the AC power supply 3 to generate the reference voltage Vref, or generating the reference voltage Vref based on the bus voltage V PN output from the bus voltage detector 23.
  • any method is publicly known, and detailed description thereof is omitted here.
  • the subtractor 64 calculates a difference voltage ⁇ V that is a difference between the bus voltage VPN and the reference voltage Vref.
  • the difference voltage ⁇ V is input to the plus terminal of the comparator 65.
  • the threshold voltage Vo is input to the negative terminal of the comparator 65.
  • the comparator 65 compares the difference voltage ⁇ V and the threshold voltage Vo, and outputs a signal that takes a high level or low level potential. For example, when the difference voltage ⁇ V is larger than the threshold voltage Vo, a high level signal is output.
  • the high-level signal is a signal indicating that the regenerative operation by the power module 22 is started when the bus voltage VPN becomes higher than a certain value.
  • the difference voltage ⁇ V is less than the threshold voltage Vo, a low level signal is output.
  • a signal output from the comparator 65 is input to the OR circuit 62 as an output signal of the regeneration start determination unit 60.
  • the difference voltage ⁇ V and the threshold voltage Vo are such that the difference voltage ⁇ V ⁇ the threshold voltage Vo. Therefore, for example, a hysteresis function is provided in the comparator 65, a one-shot trigger circuit is provided in the output of the comparator 65, or a regeneration start determination is made so that the regeneration operation continues until a certain period elapses after the regeneration operation starts. It is desirable to constitute part 60.
  • the regenerative stop determination unit 61 receives the bus current IPN .
  • Regeneration stop judgment unit 61 based on the bus current I PN, provided with a function of determining whether to stop the regenerative operation in the power module 22.
  • the regeneration stop determination unit 61 includes a comparator 66.
  • the threshold current Iref is input to the plus terminal of the comparator 66.
  • the bus current IPN is input to the negative terminal of the comparator 66.
  • the comparator 66 compares the bus current I PN and threshold current Iref, and outputs a signal which takes the potential of the High level or the Low level. For example, when the bus current I PN is greater than the threshold current Iref is, Low-level signal is output.
  • High-level signal is output.
  • the high level signal is a signal indicating that the regenerative operation in the power module 22 is stopped.
  • a signal output from the comparator 66 is input to the OR circuit 62 as an output signal of the regeneration stop determination unit 61.
  • the output of the OR circuit 62 is connected to the base of the NPN transistor 63.
  • a regenerative on signal Ron that is an output signal of the OR circuit 62 is input to the base of the NPN transistor 63.
  • a base drive signal generator 26 shown in FIG. 1 is connected to the collector of the NPN transistor 63.
  • STN is input to the collector of the NPN transistor 63 from the base drive signal SRP that is the output of the base drive signal generator 26.
  • the emitter of the NPN transistor 63 is connected to the base drive circuit 27.
  • the output signals of the regeneration start determination unit 60 and the regeneration stop determination unit 61 are input to the OR circuit 62.
  • the OR circuit 62 When any output signal is at a high level, the OR circuit 62 outputs a high level signal.
  • the OR circuit 62 outputs a high level signal, the NPN transistor 63 is turned on, and the base drive signals SRP to STN are input to the base drive circuit 27 shown in FIG.
  • the base drive signal SRP is converted into a signal that can be handled by each power element of the power module 22, and the converted base drive signals SRP ′, SRN ′, SSP ′, SSN are converted signals. ', STP', STN 'are generated.
  • the generated base drive signals SRP ', SRN', SSP ', SSN', STP ', STN' are input to the bases of the switching elements S1 to S6. Thereby, the on / off operation of the switching elements S1 to S6, that is, the regenerative operation of the power module 22 is performed.
  • the base drive signals SRP ', SRN', SSP ', SSN', STP ', STN' may be referred to as base drive signals SRP 'to STN'. Details of the base drive circuit 27 will be described later.
  • the OR circuit 62 When the output signals of the regeneration start determination unit 60 and the regeneration stop determination unit 61 are at the Low level, the OR circuit 62 outputs a Low level signal.
  • the OR circuit 62 When the OR circuit 62 outputs a low level signal, the NPN transistor 63 is turned off, and the STN input from the base drive signal SRP to the base drive circuit 27 shown in FIG. 1 is cut off. As a result, all of the switching elements S1 to S6 are turned off, and the regenerative operation is stopped.
  • the base drive circuit 27 will be described. As described above, the base drive circuit 27 uses the base drive signals SRP ′, SRN ′, and SSP ′ that the power module 22 can handle the base drive signals SRP, SRN, SSP, SSN, STP, and SSN output from the regeneration control unit 28. , SSN ′, STP ′, STN ′, and has a function of inputting to the bases of the switching elements S1 to S6 of the power module 22.
  • FIG. 4 is a diagram showing a configuration example of the base drive circuit 27 shown in FIG. As shown in FIG. 4, the base drive circuit 27 includes a base control circuit 35 and a voltage application unit 36.
  • the base control circuit 35 electrically insulates the signal input to the base control circuit 35 and outputs an output signal having the same potential as that of the input signal, that is, when the input signal is at a high level, When the input signal is at a low level, a function of outputting an output signal at a low level to the voltage application unit 36 is provided.
  • a base drive signal SRP that takes a high-level potential
  • the base control circuit 35 is electrically insulated from the base drive signal SRP, and is at a high-level potential. Is output to the voltage application unit 36.
  • a photocoupler or an insulated pulse transformer is used for the base control circuit 35.
  • the components constituting the base control circuit 35 are not limited thereto, and the input signal and the output signal are electrically insulated. Therefore, any device that transmits an output signal having the same potential as the input signal may be used.
  • the base control circuit 35 electrically insulates the base drive signal SRP and converts it into a signal having the same potential as the base drive signal SRP, and electrically insulates the base drive signal SRN,
  • the control circuit 35B for converting to a signal having the same potential is electrically insulated from the base drive signal SSP, and the control circuit 35C for converting to a signal having the same potential as the base drive signal SSP is electrically insulated from the base drive signal SSN.
  • the output signal of the base control circuit 35 is input to the voltage application unit 36.
  • the plurality of outputs of the voltage application unit 36 are connected to the bases of the switching elements S1 to S6 of the power module 22.
  • the voltage application unit 36 generates a base drive signal SRP ′ based on the output signal of the control circuit 35A, and generates a base drive signal SRN ′ based on the output signal of the control circuit 35B.
  • a second voltage application unit 36B that generates and outputs a base drive signal SSP ′ based on the output signal of the control circuit 35C.
  • the voltage application unit 36 generates a base drive signal SSN ′ based on the output signal of the control circuit 35D, and generates a base drive signal STP ′ based on the output signal of the control circuit 35E. And a fifth voltage application unit 36F that generates and outputs a base drive signal STN ′ based on the output signal of the control circuit 35F.
  • FIG. 5 is a diagram showing a configuration example of the first voltage application unit shown in FIG.
  • the first voltage application unit 36 ⁇ / b> A includes an NPN transistor 37, a PNP transistor 38, and a base resistor 39.
  • the base of the NPN transistor 37 and the base of the PNP transistor 38 are connected to each other, and the output of the control circuit 35A is connected to each base.
  • the emitter of the NPN transistor 37 and the emitter of the PNP transistor 38 are connected to each other, and one end of the base resistor 39 is connected to each of them.
  • the other end of the base resistor 39 is connected to the base of the switching element S1.
  • the collector of the NPN transistor 37 is connected to the wiring 291-1 shown in FIG.
  • the voltage VRP generated by the control power supply unit 29 shown in FIG. 2 is applied to the collector of the NPN transistor 37.
  • the collector of the PNP transistor 38 and the emitter of the switching element S1 are connected to each other and further connected to the wiring 291-2 shown in FIG. Thereby, the collector of the PNP transistor 38 and the emitter of the switching element S1 are electrically connected to the ground VRPGND shown in FIG.
  • FIG. 6 is a diagram showing a configuration example of the second voltage application unit shown in FIG.
  • the second voltage application unit 36B includes an NPN transistor 37, a PNP transistor 38, and a base resistor 39, like the first voltage application unit 36A.
  • the output of the control circuit 35B is connected to the base of the NPN transistor 37 and the base of the PNP transistor 38.
  • the other end of the base resistor 39 is connected to the base of the switching element S2.
  • the collector of the NPN transistor 37 is connected to the wiring 294-1 shown in FIG. Thereby, the voltage VN generated by the control power supply unit 29 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S2 are connected to the wiring 294-2 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S2 are electrically connected to the ground VNGND shown in FIG.
  • FIG. 7 is a diagram showing a configuration example of the third voltage applying unit shown in FIG.
  • the third voltage applying unit 36C includes an NPN transistor 37, a PNP transistor 38, and a base resistor 39, like the first voltage applying unit 36A.
  • the output of the control circuit 35C is connected to the base of the NPN transistor 37 and the base of the PNP transistor 38.
  • the other end of the base resistor 39 is connected to the base of the switching element S3.
  • the collector of the NPN transistor 37 is connected to the wiring 292-1 shown in FIG. Thereby, the voltage VSP generated by the control power supply unit 29 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S3 are connected to the wiring 292-2 shown in FIG. Thereby, the collector of the PNP transistor 38 and the emitter of the switching element S3 are electrically connected to the ground VSPGND shown in FIG.
  • FIG. 8 is a diagram showing a configuration example of the fourth voltage application unit shown in FIG.
  • the fourth voltage application unit 36D includes an NPN transistor 37, a PNP transistor 38, and a base resistor 39, like the first voltage application unit 36A.
  • the output of the control circuit 35D is connected to the base of the NPN transistor 37 and the base of the PNP transistor 38.
  • the other end of the base resistor 39 is connected to the base of the switching element S4.
  • the collector of the NPN transistor 37 is connected to the wiring 294-1 shown in FIG. Thereby, the voltage VN generated by the control power supply unit 29 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S4 are connected to the wiring 294-2 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S4 are electrically connected to the ground VNGND shown in FIG.
  • FIG. 9 is a diagram showing a configuration example of the fifth voltage application unit shown in FIG.
  • the fifth voltage application unit 36E includes an NPN transistor 37, a PNP transistor 38, and a base resistor 39, like the first voltage application unit 36A.
  • the output of the control circuit 35E is connected to the base of the NPN transistor 37 and the base of the PNP transistor 38.
  • the other end of the base resistor 39 is connected to the base of the switching element S5.
  • the collector of the NPN transistor 37 is connected to the wiring 293-1 shown in FIG. Thereby, the voltage VTP generated by the control power supply unit 29 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S5 are connected to the wiring 293-2 shown in FIG. Thereby, the collector of the PNP transistor 38 and the emitter of the switching element S5 are electrically connected to the ground VTPGND shown in FIG.
  • FIG. 10 is a diagram showing a configuration example of the sixth voltage application unit shown in FIG.
  • the sixth voltage application unit 36F includes an NPN transistor 37, a PNP transistor 38, and a base resistor 39, like the first voltage application unit 36A.
  • the output of the control circuit 35F is connected to the base of the NPN transistor 37 and the base of the PNP transistor 38.
  • the other end of the base resistor 39 is connected to the base of the switching element S6.
  • the collector of the NPN transistor 37 is connected to the wiring 294-1 shown in FIG. Thereby, the voltage VN generated by the control power supply unit 29 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S6 are connected to the wiring 294-2 shown in FIG.
  • the collector of the PNP transistor 38 and the emitter of the switching element S6 are electrically connected to the ground VNGND shown in FIG.
  • the operation of the base drive circuit 27 will be described using the first voltage application unit 36A shown in FIG.
  • the control circuit 35A When the base drive signal SRP of the switching element S1 is output from the regeneration control unit 28, the control circuit 35A generates and outputs a signal insulated from the base drive signal SRP.
  • the PNP transistor 38 When a high level signal is input to the first voltage application unit 36A, the PNP transistor 38 is turned off and the NPN transistor 37 is turned on.
  • the wiring 291-1 and the base of the switching element S1 become conductive via the base resistor 39, and charges are charged between the base and emitter electrodes of the switching element S1.
  • a voltage applied between the base and emitter electrodes of the switching element S1 is referred to as a voltage VBE.
  • VBE a voltage applied between the base and emitter electrodes of the switching element S1
  • the NPN transistor 37 When a low level signal is input to the first voltage application unit 36A, the NPN transistor 37 is turned off and the PNP transistor 38 is turned on. As a result, the ground VRPGND and the base of the switching element S1 become conductive through the base resistor 39, and the charge charged between the base and emitter electrodes of the switching element S1 is discharged. When the electric charge is discharged and the voltage VBE applied between the base and emitter electrodes of the switching element S1 becomes less than a predetermined threshold voltage, the switching element S1 is turned off. When the voltage VBE decreases to the ground VRPGND, the discharge of the charge charged between the base and emitter electrodes of the switching element S1 is completed.
  • the base drive circuit 27 uses the power supplies generated by the control power supply unit 29 to generate the base drive signals SRP, SPN, SSP, SSN, STP, and STN output from the regeneration control unit 28. Are converted into base drive signals SRP ′, SRN ′, SSP ′, SSN ′, STP ′, and STN ′ that can be handled by the switching elements S1 to S6.
  • FIG. 11 is a diagram for explaining the operation of the voltage phase detector shown in FIG.
  • the emitters of the switching elements S1, S3, and S5 arranged on the positive electrode side of the power module 22 are connected to the R phase, S phase, and T phase of the AC power supply 3 via the reactor 2.
  • the emitters of the switching elements S1, S3, and S5 are connected to the ground VRPGND, VSPGND, and VTPGND of the control power supply unit 29.
  • the voltage phase detector 24 detects the input R-phase voltage VR1 based on a signal generated at the ground VRPGND connected to the wiring 291-2.
  • Input R-phase voltage VR1 is equivalent to a voltage applied between AC terminal 11 and AC terminal 12 shown in FIG.
  • the voltage phase detector 24 detects the input S-phase voltage VS1 based on a signal generated at the ground VSPGND connected to the wiring 292-2.
  • Input S-phase voltage VS1 is equivalent to a voltage applied between AC terminal 12 and AC terminal 13 shown in FIG.
  • the voltage phase detector 24 detects the input T-phase voltage VT1 based on a signal generated at the ground VTPGND connected to the wiring 293-2.
  • Input T-phase voltage VT1 is equivalent to a voltage applied between AC terminal 13 and AC terminal 11 shown in FIG. Since the emitters of the switching elements S1, S3, S5 are connected to the ground VRPGND, VSPGND, VTPGND of the control power supply unit 29, the voltage phase detection unit 24 has a signal flowing through the emitters of the switching elements S1, S3, S5, or The voltage phase of the AC voltage when the switching elements S1 to S6 are turned on / off so that AC power is regenerated from the power module 22 to the AC power source 3 based on a signal flowing to the ground serving as the reference potential of the control power supply unit 29. A phase detection signal indicating the detected voltage phase is generated and output.
  • FIG. 12 is a time chart for explaining the operation of the converter according to the first embodiment.
  • FIG. 12 shows, in order from the top, the waveforms of line voltages VR-S, VS-T, VT-R, VS-R, VT-S, and VR-T output from the AC power supply 3, and the line voltages.
  • Waveforms of six types of phase detection signals generated based on the waveforms, waveforms of base drive signals SRP to STN, and waveforms of regenerative currents (Irr, Isr, Itr) flowing in the R phase, T phase, and S phase are shown.
  • the line voltage VR-S and the line voltage VS-R correspond to the aforementioned input R-phase voltage VR1 and change complementarily.
  • the line voltage VS-T and the line voltage VT-S correspond to the input S-phase voltage VS1 and change complementarily.
  • the line voltage VR-T and the line voltage VT-R correspond to the above-described input T-phase voltage VT1 and change complementarily.
  • the regenerative current is a current that flows from the motor driving device 4 shown in FIG. 1 toward the AC power supply 3 via the switching elements S1 to S6 during the regenerative operation.
  • the line voltage VR-S is obtained by detecting a voltage difference from the R phase with reference to the S phase, whereas the line voltage VS-R is a voltage difference from the S phase with respect to the R phase. Is detected. The voltage phase between the line voltage VR-S and the line voltage VS-R is shifted by 180 degrees.
  • the line voltage VS-T is obtained by detecting a voltage difference from the S phase with respect to the T phase, whereas the line voltage VT-S is a voltage with respect to the T phase with respect to the S phase. The difference is detected, and the voltage phase between the line voltage VS-T and the line voltage VT-S is shifted by 180 degrees.
  • the line voltage is a voltage difference with the T phase detected with the R phase as a reference
  • the line voltage VR-T is a voltage difference with the R phase detected with the T phase as a reference.
  • the voltage phase between the line voltage and the line voltage VR-T is shifted by 180 degrees.
  • the voltage phase detector 24 is configured to detect the line voltage VR-S, the line voltage VS-R, the line voltage VS-T, The voltage VT-S, the line voltage VR-T, and the line voltage VT-R are estimated, and based on the estimated results, a zero cross point of each line voltage is extracted, and the extracted zero cross point is handled as a phase detection signal.
  • This phase detection signal is output to the base drive signal generator 26.
  • Each phase detection signal output from the voltage phase detector 24 is illustrated in FIG. In FIG.
  • phase detection signal between the RS lines, the phase detection signal between the SR lines, the phase detection signal between the ST lines, the phase detection signal between the TS lines, and the phase between the TR lines A detection signal and an RT line phase detection signal are shown.
  • an RS line phase detection signal takes a high level value in a section (phase section) where the difference between the line voltage VR-S and the line voltage VS-R is positive (phase section), and a negative section (phase section). ) Takes a low level value.
  • the voltage phase detector 24 generates a phase detection signal whose level changes in this way in association with each line voltage.
  • the base drive signal generator 26 generates an STN from the base drive signal SRP by the following method based on each phase detection signal shown in FIG.
  • the base drive signal generation unit 26 sets the base drive signals SRP and SSN to a high level and controls the switching elements S1 and S4 to be on.
  • the base drive signal generator 26 sets the base drive signals SSP and STN to High level, and controls the switching elements S3 and S6 to be on.
  • the base drive signal generation unit 26 sets the base drive signals STP and SRN to a high level, and controls the switching elements S5 and S2 to be on.
  • the base drive signal generation unit 26 sets the base drive signals SSP and SRN to a high level and controls the switching elements S3 and S2 to be on.
  • the base drive signal generation unit 26 sets the base drive signals STP and SSN to a high level and controls the switching elements S5 and S4 to be on.
  • the base drive signal generator 26 sets the base drive signals SRP and STN to the high level, and controls the switching elements S1 and S6 to be on.
  • FIG. 1 shows the R-phase current Ir, the S-phase current Is, and the T-phase current It indicated by arrows in the direction from the AC power supply 3 to the converter 1-1. Treated as a positive current, the waveforms of the three regenerative currents shown in FIG. 12 are represented accordingly.
  • the switching elements S1 to S6 perform the switching operation, the R-phase regenerative current Irr, the S-phase regenerative current Isr, and the T-phase regenerative current Itr as shown in FIG. From time t20 to t40, since the potential of the line voltage VR-S becomes maximum, the switching elements S1 and S4 are turned on, and the other switching elements are turned off. As a result, the smoothing capacitor 21 and the RS of the AC power supply 3 are connected via the impedance of the reactor 2. Therefore, a regenerative current flows in the R phase and the S phase via the switching elements S1 and S4 in the on state.
  • FIG. 13 is a diagram showing an inductance existing between the AC power source and the AC terminal of the power module, and an inductance existing between the emitter of the switching element arranged on the positive side of the power module and the AC terminal of the power module. It is.
  • the inductor LR is an inductor of the reactor 2-1 shown in FIG.
  • the inductor LS is the inductor of the reactor 2-2 shown in FIG.
  • the inductor LT is an inductor of the reactor 2-3 shown in FIG.
  • the inductor LR1 is an inductance caused by a wiring provided between the AC terminal 11 and the emitter of the switching element S1.
  • the inductor LS1 is an inductance caused by a wiring provided between the AC terminal 12 and the emitter of the switching element S3.
  • the inductor LT1 is an inductance caused by a wiring provided between the AC terminal 13 and the emitter of the switching element S5.
  • the input R-phase voltage VR1 is a voltage applied to the emitter of the switching element S1.
  • the R-phase voltage VR ⁇ b> 2 is a voltage applied between the inductor LR and the AC terminal 11.
  • the input S-phase voltage VS1 is a voltage applied to the emitter of the switching element S3.
  • the S-phase voltage VS2 is a voltage applied between the inductor LS and the AC terminal 12.
  • Input T-phase voltage VT1 is a voltage applied to the emitter of switching element S5.
  • the T-phase voltage VT2 is a voltage applied between the inductor LT and the AC terminal 13.
  • the input R-phase voltage VR1 is detected based on the signal generated in the ground VRPGND connected to the wiring 291-2, and the wiring 292- 2, the input S-phase voltage VS1 is detected based on the signal generated at the ground VSPGND connected to the second terminal, and the input T-phase voltage VT1 is further detected based on the signal generated at the ground VTPGND connected to the wiring 293-2. Detected. Therefore, when the power module 22 is viewed from the AC power supply 3, the inductor LR exists in the wiring connecting the terminal 3R of the AC power supply 3 and the AC terminal 11, and the wiring connecting the AC terminal 11 and the switching element S1 is present.
  • the inductor LR1 includes an inductor LR1 and an inductance caused by the wiring 291-2.
  • the inductor LS exists in the wiring connecting the terminal 3S of the AC power supply 3 and the AC terminal 12, and the wiring connecting the AC terminal 12 and the switching element S3 is caused by the inductor LS1 and the wiring 292-2.
  • the inductor LT exists in the wiring connecting the terminal 3T and the AC terminal 13 of the AC power supply 3, and the wiring connecting the AC terminal 13 and the switching element S5 is caused by the inductor LT1 and the wiring 293-2.
  • the inductance component from the AC power supply 3 to the switching elements S1, S3, S5 is increased.
  • converter 1-1 Although it is possible to take measures to suppress voltage fluctuation using a filter capacitor or the like, using a filter capacitor is not desirable because a voltage phase delay occurs.
  • fluctuations in input R-phase voltage VR1 and the like detected by voltage phase detection unit 24 are suppressed without using a filter capacitor. Even when the power of the converter 1-1 is turned on in the operating state, the fluctuation of the signal generated in the ground VRPGND connected to the wiring 291-2 is suppressed, and the input R-phase voltage VR1 in the voltage phase detection unit 24 is suppressed. Detection accuracy is improved.
  • the AC terminals 11, 12, 13 of the converter 1-1 increase in size.
  • the AC terminals 11, 12 and 13 are directly connected to the printed circuit board on which the voltage phase detection unit 24, the base drive signal generation unit 26, the regeneration control unit 28, the base drive circuit 27 and the control power supply unit 29 are mounted by screwing or the like. It becomes difficult to do. Therefore, it is necessary to connect the AC terminals 11, 12, 13 and the printed circuit board using a bus bar, a harness, or the like, and the configuration for detecting the voltage phase of the AC power source 3 is complicated.
  • the input R-phase voltage VR1 and the like are detected using a signal generated in the ground connected to the wiring 291-2 that is the pattern wiring on the printed circuit board, Since the voltage phase of the AC power source 3 can be detected, even when the AC terminals 11, 12, 13 are enlarged, a bus bar, a harness, and the like are not required, the manufacturing cost of the converter 1-1 is reduced, and the AC power source 3 is further reduced. It is possible to prevent the configuration for detecting the voltage phase from becoming complicated.
  • the converter 1-1 since a signal generated at the ground connected to the wiring 291-2 or the like can be used, it is possible to design a pattern that can be easily arranged on a printed circuit board, thereby saving space. Can be achieved.
  • FIG. 14 is a diagram showing a configuration of a converter according to Embodiment 2 of the present invention.
  • Converter 1-2 according to the second embodiment includes voltage phase detector 24A instead of voltage phase detector 24 shown in FIG.
  • the variation will be described, and then the configuration of the voltage phase detection unit 24A according to the second embodiment will be described.
  • FIG. 15 is a diagram illustrating waveforms such as a line voltage, a base drive signal, and a phase detection signal that are generated during the regenerative operation of the converter according to the first embodiment.
  • FIG. 15 shows, in order from the top, the waveforms of the base drive signals SRP to STN, the waveforms of the line voltages VR-S, VS-T, and VT-R during the regenerative operation, and the R phase generated during the regenerative operation.
  • the waveform of the phase detection signal RSD is shown.
  • FIG. 15 when the STN is switched between the high level and the low level from the base drive signal SRP, when the on / off operation of the switching elements S1 to S6 shown in FIG.
  • a spike-like voltage fluctuation occurs in the inter-voltages VR-S, VS-T, and VT-R.
  • the potential of the phase detection signal RSD changes in the order of High level, Low level, and High level in a short period of time.
  • FIG. 16 is a diagram illustrating waveforms of a phase voltage, a base drive signal, a phase detection signal, and the like generated during the regenerative operation of the converter according to the first embodiment.
  • the waveforms of the base drive signals SRP to STN during the regenerative operation the waveforms of the phase voltages VR2, VS2, and VT2 during the regenerative operation, and the phase detection signals RD and SD generated during the regenerative operation are shown.
  • TD waveforms As shown in FIG. 16, when the STN is switched between the high level and the low level from the base drive signal SRP, the switching elements S1 to S6 shown in FIG. Spike-like voltage fluctuations occur in the voltages VR2, VS2, and VT2.
  • the potential of the phase detection signal RD changes in the order of High level, Low level, and High level in a short period of time.
  • the potentials of the phase detection signals SD and TD change similarly.
  • the input R-phase voltage VR1 or the like is input to the voltage phase detection unit 24.
  • the wiring 291 is provided between the AC terminal 11 of the power module 22 and the switching element S1. Inductance due to -2 exists. Although this inductance can reduce the influence of voltage fluctuation caused by the regenerative operation of the external device connected to the AC power supply 3, the switching elements S1 to S6 are connected to the wiring 291-2 connected to the switching elements S1 to S6. Spike-like voltage fluctuations resulting from the on / off operation of the first and second signals are superimposed. The voltage fluctuation shown in FIG. 15 and FIG.
  • the 16 is caused by the fact that the phases of the switching elements S1 to S6 are switched from on to off or from off to on, and the phase is conducted through the rectifier elements D1 to D6.
  • the voltage is divided by the inductance and the inductance of the AC terminals 11, 12, and 13. That is, during the regenerative operation of the power module 22, the line voltage and the phase voltage generated based on the input R-phase voltage VR1, the input S-phase voltage VS1, and the input T-phase voltage VT1 are spike-like generated by the regenerative operation. It becomes more susceptible to voltage fluctuations.
  • the voltage phase detection unit 24 transmits signals such as a wiring 291-2 connected to the switching element S1, a wiring 292-2 connected to the switching element S3, a wiring 293-2 connected to the switching element S5, That is, since the input R-phase voltage VR1, the input S-phase voltage VS1, and the input T-phase voltage VT1 are detected, it is also affected by voltage fluctuations caused by ringing that occurs during the on / off operation of the switching elements S1, S3, and S5. Therefore, compared with the case where the phase detection signal is generated by detecting the values of the phase voltages VR2, VS2, VT2 applied between the reactor 2 and the AC terminals 11, 12, 13 of the power module 22, the voltage There are many factors of fluctuation.
  • the voltage phase detection unit 24 shown in the first embodiment can reduce the influence of voltage fluctuation caused by the regenerative operation of the external device connected to the AC power supply 3, but the converter 1 in which the voltage phase detection unit 24 is mounted. There is a problem that it is easily affected by voltage fluctuations caused by the regenerative operation 1.
  • a method of removing voltage fluctuations by filtering the detected line voltage or phase voltage waveform with a filter capacitor or the like, and suppressing the ringing by slowing the switching speed of the switching element. A method etc. can be considered.
  • filtering when filtering is performed, a delay occurs from the original voltage phase of the AC power supply 3, and correction to match the original voltage phase is required. Further, when the switching speed is slowed, there is a problem that the switching loss of the power module 22 increases.
  • the maximum or minimum value of the phase voltage generated based on the input R phase voltage VR1, the input S phase voltage VS1, and the input T phase voltage VT1 is detected, or the input R
  • the voltage phase of the AC power supply 3 is detected by detecting the maximum value or the minimum value of the line voltage generated based on the phase voltage VR1, the input S phase voltage VS1, and the input T phase voltage VT1.
  • FIG. 17 is a diagram showing a configuration example of the voltage phase detection unit shown in FIG.
  • the voltage phase detector 24A includes a neutral point 40, a resistor 41A, a resistor 41B, a resistor 41C, and a phase detector 42. One end of each of the resistor 41A, the resistor 41B, and the resistor 41C is connected to the neutral point 40. The neutral point 40 is connected to the phase detector 42.
  • the other end of the resistor 41A receives an input R-phase voltage VR1 that is the potential of the emitter of the switching element S1.
  • the input R-phase voltage VR1 is input to the resistor 41A and to the phase detector 42.
  • An input S-phase voltage VS1 which is the potential of the emitter of the switching element S3, is input to the other end of the resistor 41B.
  • the input S-phase voltage VS1 is input to the resistor 41B and to the phase detector 42.
  • An input T-phase voltage VT1, which is the potential of the emitter of the switching element S5, is input to the other end of the resistor 41C.
  • the input T-phase voltage VT1 is input to the resistor 41C and to the phase detector 42.
  • the phase detection unit 42 generates phase detection signals RD3, SD3, and TD3 based on the input signal.
  • the value of the phase detection signal RD3 corresponds to the value of the input R-phase voltage VR1 with reference to the potential NG at the neutral point 40.
  • the value of the phase detection signal SD3 corresponds to the value of the input S-phase voltage VS1 with reference to the potential NG at the neutral point 40.
  • the value of the phase detection signal TD3 corresponds to the value of the input T-phase voltage VT1 with reference to the potential NG at the neutral point 40.
  • FIG. 18 is a diagram illustrating a waveform of an R-phase phase detection signal generated by the voltage phase detection unit according to the second embodiment and a waveform of an R-phase phase voltage generated based on the phase detection signal.
  • FIG. 18 shows the phase detection threshold voltage, the waveform of the neutral phase reference phase voltage VR3 generated during the regeneration operation of the converter 1-2, and the voltage phase detection unit 24A during the regeneration operation of the converter 1-2.
  • the waveform of the generated phase detection signal RD3 is shown.
  • the value of the phase detection threshold voltage is set to such a value that the potential of the phase detection signal RD3 becomes High level when the phase of the neutral point reference phase voltage VR3 is between 60 ° and 120 °.
  • the threshold voltage for phase detection is set in the voltage phase detector 24A.
  • phase of the neutral point reference phase voltage VR3 When the phase of the neutral point reference phase voltage VR3 reaches 60 °, the potential of the phase detection signal RD3 changes from Low level to High level. When the phase of the neutral point reference phase voltage VR3 reaches 90 °, the potential of the phase detection signal RD3 changes in the order of High level, Low level, and High level in a short period of time. When the phase of the neutral point reference phase voltage VR3 reaches 120 °, the potential of the phase detection signal RD3 changes from the High level to the Low level. In the interval from the phase of the neutral point reference phase voltage VR3 to 120 ° to the phase 60 ° after one cycle, the potential of the phase detection signal RD3 is maintained at the low level. The phase 60 ° after one cycle is equivalent to the phase 420 °.
  • the potential of the phase detection signal RD3 changes from the Low level to the High level.
  • the center of the section from the phase 120 ° to 420 ° of the neutral point reference phase voltage VR3 corresponds to the phase 270 ° of the neutral point reference phase voltage VR3, and the phase of the neutral point reference phase voltage VR3 is 270 °. In this case, the potential of the neutral point reference phase voltage VR3 is minimum.
  • the waveform of the S-phase phase detection signal generated by the voltage phase detection unit 24A during the regeneration operation of the converter 1-2 and the S generated based on the S-phase detection signal changes with the same tendency as the waveform shown in FIG.
  • the waveform of the T-phase detection signal generated by the voltage phase detector 24A during the regeneration operation of the converter 1-2 and the waveform of the T-phase voltage generated based on the T-phase detection signal are shown in FIG. It changes with the same tendency as the waveform shown.
  • the phase of the neutral point reference phase voltage VR3 is changed from 60 ° by setting the value of the phase detection threshold voltage near the value at which the potential of the neutral point reference phase voltage VR3 becomes maximum. Up to 120 °, the potential of the phase detection signal RD3 changes once. That is, the number of times affected by the on / off operation of the switching element can be set only when the phase of the neutral reference phase voltage VR3 is 90 °.
  • the potential of the phase detection signal RD3 changes in the order of High level, Low level, and High level. In this manner, the potential of the phase detection signal RD3 varies.
  • the width is shorter than the width of the section where the phase of the neutral point reference phase voltage VR3 is 120 ° to 420 °, that is, the width of the section where the potential of the phase detection signal RD3 is maintained at the low level. Therefore, when the period during which the low-level phase detection signal RD3 continues to be output does not exceed the specific period, the low-level phase detection signal RD3 is determined to be noise, thereby reducing the influence of voltage fluctuation. be able to.
  • the potential of the phase detection signal RD3 changes from the High level to the Low level in the interval where the phase of the neutral point reference phase voltage VR3 is 120 ° to 420 °.
  • the minimum value of the neutral point reference phase voltage VR3 can be calculated by calculating the time from the time point to the time point when the level changes from the Low level to the High level. This time is assumed to be longer than the specific period used for the noise determination. By utilizing the minimum value of the neutral point reference phase voltage VR3, the voltage phase of the AC power supply 3 can be detected.
  • the phase detection signal is generated based on the signals generated at grounds VRPGND, VSPGND, and VTPGND provided in control power supply unit 29. Even in this case, the voltage phase of the AC power supply 3 can be detected without being affected by the on / off operation of the switching element.
  • the voltage phase is detected using the minimum value of the phase voltage.
  • the converter 1-2 according to the second embodiment has not only the minimum value of the phase voltage but also the maximum value.
  • voltage phase detection can be performed in a shorter time. For example, by adding a phase detection threshold voltage such that the phase detection signal RD3 is at a high level while the phase of the neutral point reference phase voltage VR3 is between 240 ° and 300 °, The maximum value of the phase voltage VR3 can be calculated.
  • the phase of the maximum value of the neutral point reference phase voltage VR3 corresponds to, for example, the phase 90 ° and the phase 270 ° of the neutral point reference phase voltage VR3 shown in FIG.
  • the phase of the neutral point reference phase voltage VR3 is between 60 ° and 120 °, and the phase of the neutral point reference phase voltage VR3 is between 240 ° and 300 °.
  • a phase detection threshold voltage is set such that the potential of the detection signal RD3 is at a high level.
  • the phase where the switching element is turned on and off as viewed from the neutral reference phase voltage VR3 is 30 °, 90 °. 150.degree., 210.degree., 270.degree., 330.degree., Etc., for example, the threshold voltage for phase detection is set between the phase of the neutral reference phase voltage VR3 from 45.degree.
  • a phase detection threshold voltage may be set so that the potential of the phase detection signal RD3 is at a high level until the angle.
  • the voltage phase is detected by calculating the phase voltage, but the converter 1-2 of the second embodiment calculates the voltage phase by calculating the line voltage. It is also possible to perform detection. For example, when the phase of the line voltage is between 45 ° and 135 °, a phase detection threshold voltage may be set such that the potential of the phase detection signal is at a high level. In this case, when the phase of the line voltage is between 135 ° and 405 °, the potential of the phase detection signal is at a low level, and the center point of the phase of the line voltage from 135 ° to 405 ° is the phase 270 °. The line voltage corresponding to is the minimum value.
  • the voltage phase detection unit 24 according to the first embodiment and the voltage phase detection unit 24A according to the second embodiment may be configured by hardware using a photocoupler, a logic IC, or the like.
  • a single circuit A composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof, or may be configured by software.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • a line voltage that is a line voltage is obtained by using a signal transmitted to the pattern wiring on the printed circuit board. Since VR-S, line voltage VS-T, line voltage VT-R, and input R phase voltage VR1, input S phase voltage VS1, and input T phase voltage VT1, which are phase voltages, can be calculated, these voltages are Can be used to detect a power failure, and can be used to set the reference voltage Vref of the regeneration control unit 28. The detection of a power failure is to detect a state where power from the AC power source 3 is not supplied to the converter.
  • 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.

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

Abstract

L'invention concerne un convertisseur (1-1) comprenant : un module de puissance (22) ayant des bornes de courant alternatif (11, 12, 13) qui sont connectées à une alimentation électrique en courant alternatif (3), une borne de courant continu (14), une borne de courant continu (15) et une pluralité d'éléments de commutation ; un circuit d'attaque de base (27) ; et une unité d'alimentation électrique de commande (29). Le convertisseur (1-1) comprend également une unité de détection de phase de tension (24) qui, sur la base des signaux circulant vers les émetteurs de la pluralité d'éléments de commutation connectés à la borne de courant continu (14) ou les signaux circulant vers une masse qui sert de potentiel de référence pour l'unité d'alimentation électrique de commande (29), détecte la phase de tension de la tension alternative et génère et délivre un signal de détection de phase qui indique la phase de tension détectée. Le convertisseur (1-1) comprend également une unité de génération de signal d'attaque de base (26) qui génère un signal d'attaque pour commander le fonctionnement marche-arrêt de la pluralité d'éléments de commutation sur la base du signal de détection de phase.
PCT/JP2018/022280 2018-06-11 2018-06-11 Convertisseur WO2019239469A1 (fr)

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PCT/JP2018/022280 WO2019239469A1 (fr) 2018-06-11 2018-06-11 Convertisseur
JP2019528930A JP6608096B1 (ja) 2018-06-11 2019-01-29 コンバータ及びモータ制御装置
PCT/JP2019/003034 WO2019239628A1 (fr) 2018-06-11 2019-01-29 Convertisseur et dispositif de commande de moteur
CN201980037731.4A CN112219348A (zh) 2018-06-11 2019-01-29 转换器及电动机控制装置
TW108119130A TWI705647B (zh) 2018-06-11 2019-06-03 變換器及馬達控制裝置

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