WO2020012802A1 - Dispositif de commande, procédé de spécification de signal de commande et programme - Google Patents

Dispositif de commande, procédé de spécification de signal de commande et programme Download PDF

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Publication number
WO2020012802A1
WO2020012802A1 PCT/JP2019/021030 JP2019021030W WO2020012802A1 WO 2020012802 A1 WO2020012802 A1 WO 2020012802A1 JP 2019021030 W JP2019021030 W JP 2019021030W WO 2020012802 A1 WO2020012802 A1 WO 2020012802A1
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Prior art keywords
input current
period
current
current value
control signal
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PCT/JP2019/021030
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English (en)
Japanese (ja)
Inventor
貴政 渡辺
真一 小宮
清水　健志
角藤　清隆
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三菱重工サーマルシステムズ株式会社
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Publication of WO2020012802A1 publication Critical patent/WO2020012802A1/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
    • 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
    • H02M7/21—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 using devices of a triode or transistor type requiring continuous application of a control signal

Definitions

  • the present invention relates to a converter device, a control signal specifying method, and a program.
  • the converter device is a device that converts AC power into DC power.
  • the converter device is required to improve conversion efficiency when converting AC power to DC power.
  • Patent Literature 1 discloses, as a related technique, a technique relating to synchronous rectification control for improving efficiency by turning on a MOS transistor even during a part of a period during which an input current of a converter device flows.
  • the object of the present invention is to provide a converter device, a control signal specifying method, and a program that can solve the above-mentioned problems.
  • the converter device has an input current acquisition unit that acquires a current value of an input current input from an AC power supply, and whether the current value of the input current is equal to or less than a predetermined current value
  • An input current determination unit that determines whether or not, when the input current determination unit determines that the current value of the input current is equal to or less than a predetermined current value, for a half cycle of the AC voltage output from the AC power supply,
  • a first period specifying unit that specifies a first period that is a certain period in which the input current of the current value is expected to flow, and a control that specifies a control signal that turns on the switching element based on the first period
  • a signal specifying unit specifies a control signal that turns on the switching element based on the first period
  • the control signal specifying unit may specify a control signal for turning on a switching element based on the first period or the third period.
  • the third period may be within the half cycle.
  • the converter device according to any one of the first to third aspects has two switching elements, and rectifies the power output from the AC power supply. And a control signal output unit that outputs the control signal to one of the two switching elements in the half cycle in which the control signal is applied.
  • the current value of the input current is less than a half cycle before the control signal is applied.
  • the current value of the input current in a half cycle may be used.
  • the current value of the input current is a current value of the input current in a half cycle immediately before a half cycle to which the control signal is applied. You may.
  • the current value of the input current is the current value of the input current in a plurality of past half cycles. May be the average value.
  • the converter device includes a zero-crossing detector that detects a zero-crossing point of the AC voltage, and a converter based on the zero-crossing point.
  • a reference specifying unit that specifies a reference timing of the half cycle.
  • the converter device according to any one of the first to eighth aspects further comprises an input current that specifies a current value of the input current based on a physical quantity related to the input current.
  • An input current obtaining unit configured to obtain the current value specified by the input current specifying unit.
  • a control signal specifying method includes obtaining a current value of an input current input from an AC power supply, and determining whether the current value of the input current is equal to or less than a predetermined current value. And determining that the current value of the input current is equal to or less than a predetermined current value, it is expected that the input current of the current value flows for a half cycle of the AC voltage output from the AC power supply. Specifying a first period, which is a predetermined period, and specifying a control signal for turning on the switching element based on the first period.
  • the program obtains a current value of an input current input from an AC power supply, and determines whether the current value of the input current is equal to or less than a predetermined current value. And determining that the current value of the input current is equal to or less than a predetermined current value, it is expected that the input current of the current value flows for a half cycle of the AC voltage output from the AC power supply. Specifying a first period, which is a predetermined period, and specifying a control signal for turning on the switching element based on the first period.
  • the control signal specifying method, and the program according to the embodiment of the present invention when performing synchronous rectification control in the converter device, efficiency can be improved regardless of the magnitude of the input current of the converter device.
  • FIG. 1 is a diagram illustrating a configuration of a motor drive device according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a power supply voltage, an input current, and a control signal according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating a configuration of a converter control unit according to an embodiment of the present invention.
  • FIG. 4 is a diagram for explaining a period during which a switching element is turned on in one embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a configuration of a control signal generation unit according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a processing flow of a converter control unit according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating an example of a power supply voltage, an input current, and a control signal according to another embodiment of the present invention.
  • FIG. 2 is a schematic block diagram illustrating a configuration of a computer according to at least one embodiment.
  • FIG. 1 is a diagram showing a configuration of a motor drive device 1 according to one embodiment of the present invention.
  • the motor drive device 1 includes a converter device 2 and an inverter device 3, as shown in FIG.
  • a first terminal of converter device 2 is connected to a first terminal of AC power supply 4.
  • a second terminal of converter device 2 is connected to a second terminal of AC power supply 4.
  • the third terminal of converter device 2 is connected to the first terminal of inverter device 3.
  • the fourth terminal of converter device 2 is connected to the second terminal of inverter device 3.
  • the third terminal of the inverter device 3 is connected to the first terminal of the motor 5.
  • the fourth terminal of the inverter device 3 is connected to the second terminal of the motor 5.
  • the fifth terminal of the inverter device 3 is connected to the third terminal of the motor 5.
  • the motor driving device 1 is a device that converts AC power from an AC power supply 4 into DC power by a converter device 2, converts the DC power into three-phase AC power by an inverter device 3, and outputs the three-phase AC power to a motor 5.
  • the AC power supply 4 supplies single-phase AC power to the converter device 2.
  • the AC power supply 4 supplies, for example, a voltage described as a power supply voltage in FIG. 2 and a current described as an input current in FIG.
  • the motor 5 rotates according to the three-phase AC power supplied from the inverter device 3.
  • the motor 5 is, for example, a compressor motor used in an air conditioner.
  • the converter device 2 includes a rectifier circuit 21, an input current identification unit 22, a zero-cross detection unit 23, and a converter control unit 24, as shown in FIG.
  • the rectifier circuit 21 includes a bridge circuit 200, a reactor 211, and a capacitor 216, as shown in FIG.
  • the bridge circuit 200 includes diodes 212a and 213a, capacitors 212b and 213b, resistors 212c and 213c, and switching elements 214 and 215.
  • Converter device 2 performs switching element 214 or 215 during a certain first period including at least a part of a period in which the input current is expected to flow when the input current supplied from AC power supply 4 is equal to or less than a predetermined current value.
  • Converter device 2 outputs the DC power to inverter device 3.
  • the first terminal of the reactor 211 is connected to the anode of the diode 212a, the first terminal of the resistor 212c, and the first terminal of the switching element 214, respectively.
  • the cathode of the diode 212a is connected to the first terminal of the capacitor 212b, the cathode of the diode 213a, the first terminal of the capacitor 213b, and the first terminal of the capacitor 216, respectively.
  • a second terminal of the capacitor 212b is connected to a second terminal of the resistor 213c.
  • the anode of the diode 213a is connected to the first terminal of the resistor 213c and the first terminal of the switching element 215, respectively.
  • the second terminal of the switching element 214 is connected to the second terminal of the switching element 215 and the second terminal of the capacitor 216, respectively.
  • the second terminal of the reactor 211 is connected to the first terminal of the rectifier circuit 21.
  • the anode of the diode 213a is connected to the second terminal of the rectifier circuit 21.
  • the cathode of the diode 212a is connected to the third terminal of the rectifier circuit 21.
  • the second terminal of the switching element 214 is connected to the fourth terminal of the rectifier circuit 21.
  • the third terminal of the switching element 214 is connected to the fifth terminal of the rectifier circuit 21.
  • the third terminal of the switching element 215 is connected to the sixth terminal of the rectifier circuit 21.
  • a circuit including the diode 212a, the capacitor 212b, and the resistor 212c is referred to as a first circuit 212.
  • a circuit including the diode 213a, the capacitor 213b, and the resistor 213c is referred to as a second circuit 213.
  • the first terminal of the rectifier circuit 21 is connected to the first terminal of the input current specifying unit 22 and the first terminal of the zero-cross detecting unit 23, respectively.
  • a second terminal of the rectifier circuit 21 is connected to a second terminal of the zero-cross detector 23.
  • the fifth terminal of the rectifier circuit 21 is connected to the first terminal of the converter control unit 24.
  • a sixth terminal of the rectifier circuit 21 is connected to a second terminal of the converter control unit 24.
  • a second terminal of the input current specifying unit 22 is connected to a third terminal of the converter control unit 24.
  • a third terminal of the zero-crossing detector 23 is connected to a fourth terminal of the converter controller 24.
  • the first terminal of the rectifier circuit 21 is connected to the first terminal of the converter device 2.
  • the second terminal of the rectifier circuit 21 is connected to the second terminal of the converter device 2.
  • the third terminal of the rectifier circuit 21 is connected to the third terminal of the converter device 2.
  • the fourth terminal of the rectifier circuit 21 is connected to the fourth terminal of the converter device 2.
  • Reactor 211 is a reactor provided to realize a boost operation.
  • the bridge circuit 200 rectifies AC power to DC power based on the control of the converter control unit 24.
  • Each of the switching elements 214 and 215 is, for example, a super-junction MOSFET (Metal-Oxide Semiconductor Field-Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), or the like.
  • FIG. 1 shows an example in which each of the switching elements 214 and 215 is a super junction MOSFET.
  • the first terminal is a drain
  • the second terminal is a source
  • the third terminal is a gate. As shown in FIG.
  • the switching element 214 has a transistor part 214a and a parasitic diode 214b between the source and the drain. Further, as shown in FIG. 1, the switching element 215 has a transistor portion 215a and a parasitic diode 215b between the source and the drain.
  • the capacitor 216 is a capacitor for smoothing the DC power output from the bridge circuit 200. By the capacitor 216, a DC voltage with a small fluctuation in the voltage value is supplied from the converter device 2 to the inverter device 3.
  • the capacitor 216 is, for example, an electrolytic capacitor.
  • the input current specifying unit 22 specifies the current value of the input current supplied from the AC power supply 4 to the converter device 2 for each cycle sufficiently shorter than the cycle of the AC voltage output from the AC power supply 4.
  • the input current specifying unit 22 includes a current sensor provided between the AC power supply 4 and the converter device 2, and specifies a current value (an example of a physical quantity related to the input current) of the input current read by the current sensor. I do.
  • the input current specifying unit 22 includes a shunt resistor provided between the AC power supply 4 and the converter device 2, and the potential difference between both ends of the shunt resistor (an example of a physical quantity related to the input current) is represented by a resistance value.
  • the current value may be specified by division.
  • the input current specifying unit 22 gives the current value of the detected input current to the converter control unit 24.
  • the zero-crossing detector 23 detects the zero-crossing point of the voltage output from the AC power supply 4.
  • the zero-cross point indicates a timing at which the voltage output from the AC power supply 4 crosses zero volts, and the timing becomes a reference timing in the processing of the motor driving device 1.
  • the zero-cross detection unit 23 generates a zero-cross signal including information on a zero-cross point.
  • the zero-cross detector 23 outputs a zero-cross signal to the converter controller 24.
  • Converter control unit 24 receives input current information from input current specifying unit 22.
  • the converter control unit 24 controls a period during which each of the switching elements 214 and 215 is turned on and a period during which the switching elements 214 and 215 are turned off.
  • the converter control unit 24 does not turn on both the switching elements 214 and 215 at the same time, turns off both the switching elements 214 and 215, or turns off the switching element 214 and turns on the switching element 215.
  • the converter control unit 24 does not turn on both of the switching elements 214 and 215 at the same time. Are turned off, or the switching element 214 is turned on and the switching element 215 is turned off.
  • each of the switching elements 214 and 215 is a super junction MOSFET, the potential of the first terminal of the AC power supply 4 is higher than the potential of the second terminal, and the converter control unit 24 turns off both the switching elements 214 and 215.
  • condition 1 current flows from the first terminal of the AC power supply 4 to the reactor 211, the first circuit 212, the capacitor 216, the parasitic diode 215b, and the second terminal of the AC power supply 4, and the capacitor 216 is charged. Is done.
  • each of the switching elements 214 and 215 is a super junction MOSFET, the potential of the first terminal of the AC power supply 4 is higher than the potential of the second terminal, and the switching element 214 is off and the switching element 215 is on.
  • condition 2 current flows from the first terminal of the AC power supply 4 to the reactor 211, the first circuit 212, the capacitor 216, the transistor unit 215a, and the second terminal of the AC power supply 4, and the capacitor 216 is charged. Is done.
  • condition 2 the voltage between the source and the drain of the transistor portion 215a is almost zero, whereas in the case of the condition 1, a voltage drop of a forward voltage occurs in the parasitic diode 215b. Therefore, when supplying current to converter device 2 from the first terminal of AC power supply 4, converter control unit 24 sets switching element 215 to a lower state than switching switching element 215 to an off state and flowing current to parasitic diode 215 b.
  • the efficiency can be improved by the amount of the forward voltage generated by the parasitic diode 215b.
  • each of the switching elements 214 and 215 is a super junction MOSFET, the potential of the first terminal of the AC power supply 4 is lower than the potential of the second terminal, and the converter control unit 24 turns off both the switching elements 214 and 215.
  • condition 3 current flows from the second terminal of the AC power supply 4 to the second circuit 213, the capacitor 216, the parasitic diode 214b, the reactor 211, and the first terminal of the AC power supply 4, and the capacitor 216 is charged. Is done.
  • the switching elements 214 and 215 are each a super junction MOSFET, the potential of the first terminal of the AC power supply 4 is lower than the potential of the second terminal, and the switching element 214 is on and the switching element 215 is off.
  • the converter control unit 24 turns off the switching element 215 to flow the current to the parasitic diode 215b when supplying the current from the first terminal of the AC power supply 4 to the converter device 2. Rather, it is a control unit that improves the efficiency by turning on the switching element 215 and causing a current to flow through the transistor unit 215a. Further, the converter control unit 24 according to the embodiment of the present invention turns off the switching element 214 to flow the current to the parasitic diode 214b when supplying the current to the converter device 2 from the second terminal of the AC power supply 4. Rather, it is a control unit that improves efficiency by turning on the switching element 214 and flowing current to the transistor unit 214a.
  • the converter control unit 24 includes a reference specifying unit 241, an input current acquisition unit 242, a control signal generation unit 243, and a storage unit 244, as shown in FIG.
  • the reference specifying unit 241 specifies a reference timing.
  • the reference specifying unit 241 acquires a zero cross signal from the zero cross detection unit 23.
  • the reference specifying unit 241 specifies a reference timing indicated by the acquired zero-cross signal.
  • the reference specifying unit 241 outputs the specified reference timing to the control signal generation unit 243.
  • the input current obtaining unit 242 detects the current value of the input current from the input current specifying unit 22 (that is, the current value of the input current input from the AC power supply 4 to the converter device 2) and detects the input current of the input current specifying unit 22. Acquire at each timing.
  • the input current acquisition unit 242 outputs the acquired current value to the control signal generation unit 243.
  • the control signal generation unit 243 acquires the reference timing from the reference identification unit 241. Further, the control signal generation unit 243 acquires the current value of the input current from the input current acquisition unit 242. The control signal generation unit 243 sets the phase at the reference timing acquired from the reference identification unit 241 as the reference 0 degree of the phase ⁇ . Then, the control signal generator 243 calculates the effective value of the input current based on the reference of the phase ⁇ . For example, the control signal generation unit 243 calculates the effective value of the input current by averaging the integrated value of the current values of the input current acquired from the input current acquisition unit 242 according to the phase of the phase ⁇ from the reference. .
  • the input current specifying unit 22 includes a current sensor (for example, a current transformer)
  • the input current is full-wave rectified by the bridge circuit 200 via the current transformer, and charges the capacitor 216.
  • the control signal generator 243 reads the voltage level in a state smoothed by the capacitor 216. Then, the control signal generator 243 may calculate the effective value of the input current by converting the read voltage value into a current value that is associated with the voltage value on a one-to-one basis.
  • a conversion table indicating the correspondence between the voltage value and the current value is created in advance and stored in the storage unit 244, and the control signal generation unit 243 reads the conversion table. Then, the read voltage value may be converted into the effective value of the current.
  • the control signal generator 243 compares the calculated effective value of the input current with the effective value of the input current in the data table TBL1.
  • the control signal generation unit 243 specifies the effective value of the input current closest to the calculated effective value of the input current in the data table TBL1 based on the comparison result.
  • the control signal generation unit 243 specifies the adjustment amount of the phase associated with the specified input current in the data table TBL1.
  • the control signal generation unit 243 adjusts the phase by the amount of phase adjustment specified based on the phase of the power supply voltage (that is, based on the zero-cross point). Then, the control signal generation unit 243 outputs the control signal whose phase has been adjusted to each of the switching elements 214 and 215.
  • the control signal generation unit 243 switches the switching element during a certain first period including at least a part of a period in which the input current is expected to flow. A signal for turning on the switch is specified.
  • the control signal generation unit 243 causes the switching element (the switching element 214 or 215) that is controlled to be in the off state from the phase 0 degree to 180 degrees to the phase 0 level. (The timing when the input current starts to flow in the second period is an example of the first timing, and the input current flows in the second period).
  • the signal to be turned on is specified in a third period which is the sum of a period in which the period disappears is an example of a second timing) and a period extended to at least one of immediately before and after the period.
  • the control signal generation unit 243 may set a current threshold value larger than the noise (for example, the current threshold value shown in FIG. 4) so that the noise when the current value of the input current is zero is not erroneously detected as the input current. (Threshold value 3 amps) is set in advance. Each time the control signal generation unit 243 obtains the current value of the input current from the input current identification unit 22, it compares the obtained current value of the input current with the current threshold value.
  • the control signal generation unit 243 specifies a period in which the current value of the input current exceeds the current threshold (for example, a period ⁇ 1 shown in FIG. 4) based on the comparison result. For each value of the period ⁇ 1 during which the current value of the input current exceeds the current threshold value (the phase difference between the start phase and the end phase of the period ⁇ 1), the period from when the input current starts flowing until when the input current ends (for example, the storage unit 244 stores in advance a period ⁇ 2 shown in FIG. 4), that is, ⁇ 1 and ⁇ 2, which are phase correction values for specifying the second period, in association with each other.
  • the correction value ⁇ 1 is a correction value for extending the period immediately before.
  • the correction value ⁇ 2 is a correction value for extending the period immediately after.
  • the control signal generation unit 243 determines that there is a period ⁇ 1 in which the current value of the input current exceeds the current threshold based on the comparison result, the control unit 243 extends the period ⁇ 1 by ⁇ 1 immediately before and ⁇ 2 by immediately after.
  • the period ⁇ 2 is a period in which ⁇ is extended both immediately before and immediately after the period ⁇ 2 by at least one of ⁇ and the period ⁇ 2.
  • the three periods are specified as periods during which the switching elements are turned on.
  • control signal generation unit 243 determines that there is no period ⁇ 1 in which the current value of the input current exceeds the current threshold based on the comparison result, the control signal generation unit 243 performs a certain first period (see, for example, FIG. The period ⁇ 3) is specified as a period during which the switching element is turned on. Then, the control signal generation unit 243 specifies a signal for turning on the switching element during the specified period. The control signal generation unit 243 delays the phase of the specified signal by 180 degrees, and uses the switching element (switching element 214) as a first control signal that is a control signal of the next half cycle (an example of a half cycle in which the control signal is applied). Or 215).
  • control signal generation unit 243 outputs a second control signal for turning the switching element, which has been controlled to the on state during the phase of 0 to 180 degrees, to the off state for the next half cycle from the phase of 0 to 180 degrees. Identify between degrees. Then, the control signal generation unit 243 outputs the second control signal specified in the next half cycle to a switching element (switching element 215 or 214) different from the switching element that outputs the first control signal. Note that the extension to the third period including the second period in which the input current is detected is limited at the beginning of the half period. Further, the extension to the third period including the second period in which the input current is detected is limited at the end of the half period.
  • control signal generation unit 243 performs control to turn on the switching element 215 during the phase from 0 degrees to 180 degrees, and the input current identification unit 22 detects the input current shown in FIG.
  • the unit 243 specifies a signal whose period has been extended by the phase ⁇ before and after the period in which the input current shown in FIG. 2 has a positive current value.
  • the control signal generator 243 adds a phase of 180 degrees to the phase of the generated signal. That is, the control signal generation unit 243 sets the specified signal as a control signal for the switching element 214 in the next half cycle (a period from a phase of 180 degrees to a phase of 360 degrees).
  • the control signal generator 243 outputs the control signal to the switching element 214 during a period from 180 degrees to 360 degrees in phase.
  • the control signal generation unit 243 specifies a control signal that turns off the switching element 215 during a period from 180 degrees to 360 degrees in phase.
  • the control signal generation unit 243 outputs the specified control signal to the switching element 215 during a period from 180 degrees to 360 degrees in phase. Thereafter, the control signal generation unit 243 performs the same process as the above process also during the period in which the input current shown in FIG. 2 is a negative current value, so that the next half cycle is performed based on the third period every half cycle.
  • the control signal of the cycle is specified, and the specified control signal is output to each of the switching elements 214 and 215.
  • the control signal generation unit 243 includes an example of an input current determination unit, an example of a first period identification unit, an example of a second period identification unit, an example of a third period identification unit, an example of a control signal identification unit, and an example of a control signal output unit. This is an example. That is, as shown in FIG. 5, the control signal generation unit 243 includes an input current determination unit, a first period identification unit, a second period identification unit, a third period identification unit, a control signal identification unit, and a control signal output unit. .
  • the input current determination unit determines whether the current value of the input current is equal to or less than a predetermined current value.
  • the first period identification unit determines the input current of the current value for a half cycle of the AC voltage output from the AC power supply 4 Is specified as a first period, which is a certain period in which is expected to flow.
  • the control signal specifying unit specifies a control signal for turning on the switching element based on the first period.
  • the second period identification unit determines a half cycle of the AC voltage output from the AC power supply 4 based on the current value of the input current.
  • the third period specifying unit specifies a third period that is a sum of the extended period when extending to at least one of immediately before the first timing or immediately after the second timing and the second period.
  • the control signal output unit outputs the control signal to one of the two switching elements in a half cycle of the AC voltage to which the control signal is applied.
  • the control signal specifying section may specify a control signal for turning on the switching element based on the first period or the third period.
  • the storage unit 244 stores various information necessary for the processing performed by the converter control unit 24.
  • the storage unit 244 stores, for each value of the period ⁇ 1 in which the current value of the input current exceeds the current threshold, a period from the start of the input current to the end of the flow (for example, a period ⁇ 2 illustrated in FIG. 4), That is, ⁇ 1 and ⁇ 2, which are the phase correction values for specifying the second period, are stored in advance in association with each other.
  • the inverter device 3 includes an IPM (Intelligent Power Module) 31 and an inverter control unit 32.
  • the IPM 31 generates three-phase AC power from DC power based on control by the inverter control unit 32.
  • the IPM 31 supplies the generated three-phase AC power to the motor.
  • the IPM 31 is, for example, a bridge circuit including six switching elements.
  • the inverter control unit 32 controls the IPM 31. Specifically, inverter control unit 32 causes IPM 31 to generate three-phase AC power from DC power. For example, when the IPM 31 is a bridge circuit including six switching elements, the inverter control unit 32 switches between a period in which each of the six switching elements is turned on and a period in which the six switching elements are turned off. , The IPM 31 generates three-phase AC power from DC power.
  • the input current specifying unit 22 detects an input current supplied from the AC power supply 4 to the converter device 2 at every cycle that is sufficiently shorter than the cycle of the AC voltage output from the AC power supply 4.
  • the input current specifying unit 22 gives the current value of the detected input current to the converter control unit 24.
  • the zero-crossing detector 23 detects the zero-crossing point of the voltage output from the AC power supply 4.
  • the zero-cross detection unit 23 generates a zero-cross signal including information on a zero-cross point.
  • the zero-cross detector 23 outputs a zero-cross signal to the converter controller 24.
  • the reference specifying unit 241 acquires a zero-cross signal from the zero-cross detection unit 23 (Step S1).
  • the reference specifying unit 241 specifies a reference timing indicated by the acquired zero-cross signal (Step S2).
  • the reference specifying unit 241 outputs the specified reference timing to the control signal generation unit 243.
  • the input current acquisition unit 242 acquires the current value of the input current from the input current identification unit 22 for each input current detection timing of the input current identification unit 22 (step S3).
  • the input current acquisition unit 242 outputs the acquired current value to the control signal generation unit 243.
  • the control signal generation unit 243 acquires the reference timing from the reference identification unit 241. Further, the control signal generation unit 243 acquires the current value of the input current from the input current acquisition unit 242. The control signal generation unit 243 sets the phase at the reference timing acquired from the reference identification unit 241 as the reference 0 degree of the phase ⁇ (Step S4). The control signal generation unit 243 turns on the switching element (the switching element 214 or 215) that is controlled to be in the off state from the phase 0 to 180 degrees in the third period from the phase 0 to 180 degrees. The first control signal to be set is specified (Step S5).
  • the control signal generation unit 243 sets a current threshold value larger than the noise (for example, as shown in FIG. 4) so that the noise when the current value of the input current is zero is not erroneously detected as the input current.
  • the current threshold value shown is 3 amps).
  • the control signal generation unit 243 sets the current value of the acquired input current every time the current value of the input current is acquired from the input current identification unit 22 in each half cycle, with the half cycle as one period based on the phase 0 degree. And its current threshold value (Step S5a).
  • the control signal generator 243 determines whether the current value of the input current exceeds the current threshold (Step S5b).
  • step S5c determines whether the target half cycle has ended.
  • the control signal generation unit 243 returns to the process of step S5a.
  • the control signal generation unit 243 sets the switching element to the ON state for a certain first period (for example, period ⁇ 3 shown in FIG. 4). The first control signal for turning on the switching element during the first period is specified (step S5d).
  • control signal generating section 243 When determining that the current value of the input current has exceeded the current threshold value (YES in step S5b), control signal generating section 243 specifies the phase at that time as the phase indicating the start of period ⁇ 1 (step S5e). ). The control signal generator 243 compares the current value of the next input current with the current threshold (step S5f). The control signal generation unit 243 determines whether or not the current value of the input current is equal to or smaller than the current threshold in the comparison result (Step S5g). When the control signal generation unit 243 determines that the current value of the input current is not equal to or smaller than the first current threshold value (NO in step S5g), the process returns to step S5f.
  • control signal generation section 243 specifies the phase at that time as the phase indicating the end of period ⁇ 1 (step S5g). S5h). That is, the control signal generation unit 243 specifies the value of the period ⁇ 1.
  • the control signal generation unit 243 specifies the correction values ⁇ 1 and ⁇ 2 of the phase associated with the value of the specified period ⁇ 1 in the storage unit 244 (Step S5i).
  • the control signal generation unit 243 extends the period ⁇ 1 by the phase ⁇ 1 immediately before and by the phase ⁇ 2 immediately after. That is, the control signal generation unit 243 specifies the period ⁇ 2 (Step S5j).
  • the control signal generator 243 extends the period ⁇ 2 by the phase ⁇ immediately before and immediately after (step S5k), sets the extended period as a third period in which the switching element is turned on, and sets the switching element in the third period.
  • the first control signal to be turned on is specified (step S51).
  • the control signal generation unit 243 delays the phase of the first control signal specified by the processing of step S5d or step S51 by 180 degrees, and switches the first control signal to the switching element (switching element 214 or 215) in the next half cycle. (Step S6). Further, the control signal generation unit 243 converts the second control signal that turns the switching element, which has been controlled to the on state during the phase of 0 to 180 degrees, to the off state for the next half cycle, from the phase of 0 to 180 degrees (Step S7). The control signal generator 243 delays the phase of the specified second control signal by 180 degrees, and outputs the second control signal to the switching element (switching element 215 or 214) during the next half cycle (step S8). ). The control signal generator 243 returns the process to step S1.
  • input current obtaining section 242 obtains a current value of an input current input from AC power supply 4.
  • the control signal generation unit 243 determines whether the current value of the input current is equal to or less than a predetermined current value.
  • the control signal generation unit 243 determines the current value for a half cycle of the AC voltage output from the AC power supply 4. A first period, which is a fixed period in which the input current having a value is expected to flow, is specified.
  • the control signal generating unit 243 (an example of a control signal specifying unit) specifies a control signal for turning on the switching element based on the first period. By doing so, the converter device 2 of the motor drive device 1 can perform synchronous rectification even during a period in which the input current is a relatively small current value equal to or less than the predetermined current value.
  • the predetermined current value can be set to an arbitrary current value as long as noise is not erroneously detected.
  • the converter device 2 reliably improves the efficiency by the voltage drop due to the forward voltage of the diode as compared with a rectifier circuit that does not perform synchronous rectification. Can be. Therefore, when synchronous rectification control is performed in converter device 2, regardless of the magnitude of the input current of converter device 2, efficiency can be improved even when the magnitude of the input current is relatively small.
  • the control signal generator 243 controls the switching element 214 or 215 to be turned off every half cycle from the reference timing.
  • the control signal generation unit 243 instead of controlling the switching element 214 or 215 to be in the OFF state every half cycle from the reference timing, the control signal generation unit 243 outputs the input current from the AC power supply 4.
  • a PAM (Pulse Amplitude Modulation) control signal as shown in FIG. 7 is used so as to approach the cycle of the AC voltage and approximate a sine wave (that is, to reduce the harmonic distortion to a desired distortion rate or less).
  • the PAM control may be performed.
  • the control signal generation unit 243 may use a PWM (Pulse Width Modulation) generation technique of generating a PAM control signal according to the input current.
  • PWM Pulse Width Modulation
  • the input current changes from the waveform shown by the solid line in FIG. 7 to, for example, the waveform shown by the broken line in FIG.
  • the distortion rate is improved. Note that the extension of the input current to the third period immediately before the detected second period is limited to the beginning of the half period. The extension of the input current to the third period immediately after the detected second period is limited to the end of the half cycle.
  • the control signal generation unit 243 switches from the second period in which the input current is detected to the third cycle. Do not extend the period.
  • the bridge circuit 200 has been described as including the first circuit 212 including the diode 212a and the second circuit 213 including the diode 213a.
  • the first circuit 212 and the second circuit 213 may be switching elements.
  • the bridge circuit 200 according to the embodiment of the present invention includes the first circuit 212 and the second circuit 213 which are switching elements because diodes, resistors, and capacitors are generally cheaper than switching elements. An effect that it can be realized at lower cost than in another embodiment can be expected.
  • control signal generation unit 243 has been described as specifying the control signal of the next half cycle based on the input current in the immediately preceding half cycle.
  • the control signal generation unit 243 replaces the immediately preceding half cycle with a half cycle before the immediately preceding half cycle (however, there is no sharp change in the input current, that is, the control signal
  • the control signal may be specified based on the input current in an arbitrary half cycle in the past period that was the same as the input current when applying the signal.
  • control signal generator 243 may specify the control signal based on the average current value of the input current in a plurality of past half cycles.
  • the storage unit and other storage devices in each embodiment of the present invention may be provided anywhere as long as appropriate information is transmitted and received.
  • a plurality of storage units and other storage devices may exist in a range where appropriate information is transmitted and received, and may store data in a distributed manner.
  • the order of the processes may be changed within a range where an appropriate process is performed.
  • FIG. 8 is a schematic block diagram illustrating a configuration of a computer according to at least one embodiment.
  • the computer 50 includes a CPU 60, a main memory 70, a storage 80, and an interface 90.
  • each of the above-described converter control unit 24, inverter control unit 32, and other control devices is implemented in a computer 50.
  • each processing unit described above is stored in the storage 80 in the form of a program.
  • the CPU 60 reads the program from the storage 80, expands the program in the main memory 70, and executes the above-described processing according to the program. Further, the CPU 60 secures a storage area corresponding to each of the above-described storage units in the main memory 70 according to a program.
  • Examples of the storage 80 include a hard disk drive (HDD), a solid state drive (SSD), a magnetic disk, a magneto-optical disk, a CD-ROM (Compact Disc Read Only Memory), and a DVD-ROM (Digital Documentary Discrete Memory). And a semiconductor memory.
  • the storage 80 may be an internal medium directly connected to the bus of the computer 50, or may be an external medium connected to the computer 50 via the interface 90 or a communication line. When the program is distributed to the computer 50 via a communication line, the computer 50 that has received the program may load the program into the main memory 70 and execute the above-described processing.
  • storage 80 is a non-transitory tangible storage medium.
  • the program may implement a part of the functions described above. Further, the program may be a file that can realize the above-described functions in combination with a program already recorded in the computer system, that is, a so-called difference file (difference program).
  • difference file difference program
  • the control signal specifying method, and the program according to the embodiment of the present invention when performing synchronous rectification control in the converter device, efficiency can be improved regardless of the magnitude of the input current of the converter device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

Cette invention concerne un dispositif convertisseur, comprenant : une unité d'acquisition de courant d'entrée qui acquiert une valeur de courant d'un courant d'entrée délivré à partir d'une source d'alimentation en CA ; une unité de détermination de courant d'entrée qui détermine si la valeur de courant du courant d'entrée est égale ou inférieure à une valeur de courant prédéfinie ; une unité de spécification de première période qui, lorsque l'unité de détermination de courant d'entrée détermine que la valeur de courant du courant d'entrée est égale ou inférieure à une valeur de courant prédéfinie, spécifie une première période, qui est une période constante pendant laquelle le courant d'entrée de ladite valeur de courant doit circuler, par rapport à un demi-cycle d'une sortie de tension alternative en provenance de la source d'alimentation en CA ; et une unité de spécification de signal de commande qui spécifie un signal de commande pour mettre à l'état passant un élément de commutation sur la base de la première période.
PCT/JP2019/021030 2018-07-13 2019-05-28 Dispositif de commande, procédé de spécification de signal de commande et programme WO2020012802A1 (fr)

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JP2018133125A JP7080121B2 (ja) 2018-07-13 2018-07-13 コンバータ装置、制御信号特定方法及びプログラム
JP2018-133125 2018-07-13

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010074950A (ja) * 2008-09-18 2010-04-02 Seiko Epson Corp 整流制御装置、全波整流回路、受電装置、電子機器および無接点電力伝送システム
JP2011103717A (ja) * 2009-11-10 2011-05-26 Shindengen Electric Mfg Co Ltd 共振型コンバータ
JP2014090544A (ja) * 2012-10-29 2014-05-15 Mitsubishi Electric Corp 直流電源装置、冷凍サイクル装置、空気調和機および冷蔵庫
JP2017055581A (ja) * 2015-09-10 2017-03-16 ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド 直流電源装置および空気調和機
WO2018074274A1 (fr) * 2016-10-19 2018-04-26 日立ジョンソンコントロールズ空調株式会社 Dispositif de conversion de puissance et climatiseur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010074950A (ja) * 2008-09-18 2010-04-02 Seiko Epson Corp 整流制御装置、全波整流回路、受電装置、電子機器および無接点電力伝送システム
JP2011103717A (ja) * 2009-11-10 2011-05-26 Shindengen Electric Mfg Co Ltd 共振型コンバータ
JP2014090544A (ja) * 2012-10-29 2014-05-15 Mitsubishi Electric Corp 直流電源装置、冷凍サイクル装置、空気調和機および冷蔵庫
JP2017055581A (ja) * 2015-09-10 2017-03-16 ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド 直流電源装置および空気調和機
WO2018074274A1 (fr) * 2016-10-19 2018-04-26 日立ジョンソンコントロールズ空調株式会社 Dispositif de conversion de puissance et climatiseur

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