WO2017126154A1 - Dispositif de conversion de puissance électrique et son procédé de commande - Google Patents

Dispositif de conversion de puissance électrique et son procédé de commande Download PDF

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Publication number
WO2017126154A1
WO2017126154A1 PCT/JP2016/075989 JP2016075989W WO2017126154A1 WO 2017126154 A1 WO2017126154 A1 WO 2017126154A1 JP 2016075989 W JP2016075989 W JP 2016075989W WO 2017126154 A1 WO2017126154 A1 WO 2017126154A1
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Prior art keywords
current
input voltage
control
reactor
output voltage
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PCT/JP2016/075989
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English (en)
Japanese (ja)
Inventor
友一 坂下
義章 石黒
前田　貴史
福田　秀樹
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三菱電機株式会社
三菱電機照明株式会社
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Application filed by 三菱電機株式会社, 三菱電機照明株式会社 filed Critical 三菱電機株式会社
Priority to JP2017562427A priority Critical patent/JP6309182B2/ja
Publication of WO2017126154A1 publication Critical patent/WO2017126154A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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 using semiconductor devices only
    • 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

Definitions

  • the present invention relates to a power conversion device having a power factor improvement function and a control method thereof while performing step-up / step-down conversion from AC power to DC power.
  • the PFC (Power Factor Correction) circuit used to improve the power factor suppresses harmonics and effectively uses power when stepping up and down converting AC power to DC power. It is widely used as a technique for reducing power consumption and realizing energy saving. Therefore, various types of PFC circuits have been proposed.
  • an H-type bridge buck-boost converter is used to individually perform power factor correction control corresponding to boost control, buck control, or buck-boost control.
  • a high power factor improvement effect is achieved. I try to get it. Further, since a desired output can be obtained with a single-stage converter, high efficiency can be realized at low cost.
  • the microcomputer stores the voltage near the peak of the rectified voltage in the current half cycle, and the voltage near the peak of the rectified voltage in the half cycle before the current half cycle
  • the MOSFET is controlled so that the magnitude of the current to the load is maintained when it is determined that there is an instantaneous drop when the difference between the two voltages is greater than a predetermined value.
  • control is not performed, and as a result, the output waveform changes.
  • the present invention has been made to solve the above-described problems, and is capable of performing a step-up / step-down operation stably so that the output voltage does not fluctuate even when the input voltage fluctuates. It aims at providing the power converter device which has.
  • a power converter detects a full-wave rectification circuit that full-wave rectifies an AC voltage of an AC power supply, and an input voltage that has been full-wave rectified by the full-wave rectification circuit.
  • An input voltage detection circuit, a switching element, and a reactor, and a converter that converts the input voltage into a target output voltage, an output voltage detection circuit that detects an output voltage after voltage conversion by the converter, and the reactor A power supply main circuit unit having a current detection circuit for detecting a flowing reactor current; and controlling the output voltage by controlling on / off of the switching element based on the input voltage, the output voltage, and the reactor current, and the reactor A power supply control unit that performs power factor correction control to control the current and bring the input current waveform closer to the input voltage waveform
  • the power supply control unit controls the reactor current to be set larger than the normal time so that the input voltage is normal.
  • the reactor current is set to be smaller than that in the normal state, and control is performed.
  • the method for controlling the power converter according to the present invention includes a full-wave rectifier circuit that full-wave rectifies an AC voltage of an AC power supply, and an input voltage detection that detects an input voltage after full-wave rectification by the full-wave rectifier circuit.
  • a converter having a circuit, a switching element, and a reactor, which converts the input voltage into a target output voltage, an output voltage detection circuit that detects an output voltage after voltage conversion by the converter, and a reactor current that flows through the reactor
  • a power supply main circuit unit having a current detection circuit for detecting the output voltage, and controlling the output voltage by controlling on / off of the switching element based on the input voltage, the output voltage, and the reactor current, and controlling the reactor current
  • a power control unit that performs power factor correction control to bring the input current waveform closer to the input voltage waveform.
  • An apparatus control method wherein the input voltage detection circuit detects the input voltage, an input voltage detection step, the output voltage detection circuit detects the output voltage, and the power control unit.
  • the reactor current is set to be larger than that in the normal time, and the fluctuation in which the input voltage increases from the normal time is controlled.
  • a current control step for controlling the reactor current by setting the reactor current to be smaller than normal when detected.
  • the power supply control unit of the converter that performs the power factor improvement control by controlling the reactor current has the fluctuation of the input voltage when the fluctuation occurs in the input voltage.
  • the power factor improvement control can be performed by appropriate correction according to the input voltage fluctuation.
  • FIG. 1 is a circuit block diagram illustrating an overall configuration of a power conversion device according to a first embodiment.
  • FIG. 3 is a circuit block diagram illustrating a configuration of a power supply control unit of the power conversion device according to the first embodiment. It is a figure explaining the operation mode of the buck-boost control with respect to the input-output voltage in the power converter device which concerns on Embodiment 1.
  • FIG. 4 is a flowchart illustrating a calculation control processing procedure of a power supply control unit in the power conversion device according to the first embodiment. It is a wave form diagram at the time of controlling by the peak current in the conventional power converter device.
  • FIG. 3 is a diagram illustrating a method for generating an ideal value of an input voltage in the power conversion device according to Embodiment 1.
  • FIG. It is a figure explaining the hysteresis comparator control system in the power converter device which concerns on Embodiment 1.
  • FIG. It is a figure explaining the window comparator control system in the power converter device which concerns on Embodiment 1.
  • FIG. It is a circuit block diagram which shows the whole structure of the other embodiment of the power converter device which concerns on Embodiment 1.
  • FIG. FIG. 3 is a circuit block diagram illustrating an overall configuration of a power conversion device according to a second embodiment.
  • FIG. 6 is a circuit block diagram showing a configuration of a power supply control unit of a power conversion device according to a second embodiment.
  • FIG. 1 is a circuit block diagram illustrating an overall configuration of the power conversion device according to the first embodiment
  • FIG. 2 is a circuit block diagram illustrating a configuration of a power supply control unit of the power conversion device.
  • the power conversion apparatus includes a power supply main circuit unit 1 and a power supply control unit 2 that controls the first switching element Q1 and the second switching element Q2 of the converter 5 of the power supply main circuit unit 1.
  • the power supply main circuit unit 1 includes a full-wave rectifier circuit 4 including a diode bridge circuit that full-wave rectifies the AC input voltage Vac supplied from the AC power supply 3, and an input voltage after full-wave rectification
  • An input voltage detection circuit 7 comprising voltage resistors R1 and R2, an H-type bridge step-up / down converter 5 (hereinafter referred to as a converter) that adjusts a pulsating voltage
  • the converter 5 adjusts the pulsating voltage
  • the converter 5 includes a first switching element Q1 and a diode D1.
  • a step-down arm composed of the second switching element Q2 and the diode D2, a connection point between the first switching element Q1 and the diode D1, and the second switching element Q2 and the diode D2.
  • a reactor L connected between the connection points.
  • Each of the first and second switching elements Q1 and Q2 includes an FET (Field Effect Transistor) element or an IGBT (Insulated Gate Bipolar Transistor) element, which is used for on / off control generated by the power control unit 2. It is driven by a switch signal.
  • the converter 5 has a circuit configuration including a component as a step-up converter and a component as a step-down converter.
  • the power supply control unit 2 when the output voltage detection value Vo is less than the input voltage detection value Vin, the power supply control unit 2 always turns on the first switching element Q1 and switches the second switching element Q2. Therefore, when the output voltage detection value Vo is equal to or higher than the input voltage detection value Vin, the second switching element Q2 is always turned off and the first switching element Q1 is switched. It works as a step-down converter.
  • the power supply control unit 2 always turns on the first switching element Q1 to perform the switching operation of the second switching element Q2. Therefore, the reactor current IL flowing through the reactor L corresponds to the input current Iin. It will be a thing. Further, during the step-down control operation, the power supply control unit 2 always turns off the second switching element Q2 and performs the switching operation of the first switching element Q1, so that the reactor current IL flowing through the reactor L becomes the output current Io. It will be compatible. Therefore, the current detection circuit 6 detects the current from which the switching frequency component of the input current Iin after full-wave rectification has been removed during the boost control operation, and before the current ripple of the output current Io is removed during the buck control operation. Current is detected.
  • the power supply control unit 2 controls the output control amount I for controlling the output voltage Vdc to a desired value from the deviation between the voltage Vo detected by the output voltage detection circuit 8 and the target output voltage Vo *.
  • the output control amount calculation unit 21 for calculating **, the voltage Vin detected by the input voltage detection circuit 7 and the voltage Vo detected by the output voltage detection circuit 8 are compared, and the converter 5 is operated for boost control.
  • the comparison / determination unit 22 for determining whether to perform the step-down control operation, the selector 23 for selecting the operation of the next stage, and the selector 23 selects the step-up control operation for the converter 5 based on the determination result of the comparison / determination unit 22.
  • the step-down control operation of the converter 5 is selected by the step-up control peak current calculation unit 24a for setting the peak current Iref * of the converter 5 from the output control amount I ** and the selector 23.
  • the step-down control peak current calculation unit 24b for setting the peak current Iref * during the step-down control operation of the converter 5 from the output control amount I **, the reactor current IL and the peak current Iref * of the step-up control operation or step-down control.
  • the peak current control unit 25a or the peak current control unit 25b that performs peak current control from the peak current Iref * of the operation and the output of the peak current control unit 25a or the peak current control unit 25b according to the determination result of the comparison determination unit 22 respectively.
  • an on / off signal generator 26 for selecting a signal and outputting a control signal to the switching elements Q1 and Q2.
  • the on / off signal generator 26 determines whether the switch control unit 26a and the switch control unit 26b correspond to the peak current control unit 25a and the peak current control unit 25b, and the determination result of the comparison determination unit 22, respectively.
  • a selector 26c that selects an output signal of the switch control unit 26b and switches a control signal output to the switching elements Q1 and Q2.
  • the power supply control unit 2 is obtained based on the value obtained corresponding to the input current Iin after full-wave rectification during the step-up control operation, and corresponding to the output current Io during the step-down control operation.
  • the target reactor current IL * which is the control target for the reactor current IL, is set based on each value.
  • the power supply controller 2 can optimally control the phase and waveform of the input current Iin by controlling the reactor current IL to be the target reactor current IL *. Details of how to obtain the target reactor current IL * will be described later.
  • the power supply control unit 2 resistance-divides the input voltage detection value Vin detected by dividing the pulsating voltage
  • converter 5 functions as a step-up converter
  • converter 5 functions as a step-down converter.
  • the power supply control unit 2 performs on / off control of the switching elements Q1 and Q2 of the converter 5 by using the detection signals Vin, Vo, and IL described above, so that the power supply control unit 2 can perform both the step-up control operation and the step-down control operation.
  • the PFC control function for controlling the input current Iin after full-wave rectification by the full-wave rectifier 4 is provided so that the alternating-current input current Iac has substantially the same phase and waveform as the alternating-current input voltage Vac.
  • the target input current Iin * which is a control target value when controlling the input current Iin, has the same pulsating waveform with the same phase as the pulsating voltage
  • power supply control unit 2 controls switching elements Q1 and Q2 of converter 5 such that the average of reactor current IL per unit time matches target reactor current IL *.
  • the target reactor current IL * is set to a value proportional to the target input current Iin *. Further, during the step-down control operation, a current having a value corresponding to the output current Io flows through the reactor L. Therefore, the target reactor current IL * has a value proportional to the value obtained by converting the target input current Iin * into the output current. Set.
  • the target reactor current IL * needs to be controlled so that the average of the reactor current IL per unit time becomes the target reactor current IL *.
  • the power supply control unit 2 starts the control process, first, the input voltage detection value Vin detected by dividing the pulsating voltage
  • Each of the detected output voltage values Vo detected by resistance-dividing the output voltage Vdc by the detection circuit 8 is fetched, and the target output voltage Vo * indicating the control target value of the output voltage Vo is received from the host system (step 1 (S01)).
  • the target output voltage Vo * is received from the outside such as the host system, but is not limited to this and may be a predetermined constant.
  • the output control amount calculation unit 21 outputs the output control amount I ** for controlling the output voltage Vdc to a desired value by calculation such as PI control from the deviation between the output voltage detection value Vo and the target output voltage Vo *. Is calculated (step 2 (S02)).
  • the comparison / determination unit 22 calculates the input voltage detection value Vin (instantaneous value) and the output voltage detection value Vo in order to obtain the peak current iref * corresponding to the circuit operation status in the power supply main circuit unit 1.
  • Vin instantaneous value
  • Vo output voltage detection value
  • the comparison determination unit 22 connects the common contact c of the upstream selector 23 connected to the output side of the output control amount calculation unit 21 to the individual contact a on the boost control operation side.
  • a signal for connecting the individual contact a on the boost control operation side of the selector 26c to the common contact c is sent.
  • the input voltage detection value Vin is equal to or higher than the output voltage detection value Vo (Vin ⁇ Vo)
  • it is determined that the operation is a step-down control operation, and the process proceeds to step 9 (S09).
  • the comparison / determination unit 22 connects the common contact c of the selector 23 in the previous stage connected to the output side of the output control amount calculation unit 21 to the individual contact b on the step-down control operation side. Then, a signal for connecting the individual contact b on the step-down control operation side of the selector 26c in the subsequent stage to the common contact c is sent.
  • step 4 step-up control is performed in order to perform PFC control for controlling the input current Iin after full-wave rectification so that the AC input current Iac has substantially the same phase and waveform as the AC input voltage Vac.
  • the target reactor current IL * is calculated, and in step 9 (S09), the step-down control target reactor current IL * is calculated.
  • a value twice the target reactor current iL * is set as the peak current Iref *.
  • the current corresponding to the input current Iin flows through the reactor L during the step-up control operation, and the current corresponding to the output current Io flows during the step-down control operation.
  • the method for calculating the target reactor current IL * is changed depending on whether the step-up control operation is performed or the step-down control operation is performed.
  • a boost control operation is performed (step 3 (S03)).
  • a current corresponding to the input current Iin after full-wave rectification flows through the reactor L, so that the boost control target reactor current IL * controls a current corresponding to the input current Iin.
  • the boost control peak current calculation unit 24a first uses the target input current Iin *, which is the target value of the input current Iin, and the output control amount I ** described above, and the boost control target according to the following equation (2). Reactor current IL * is calculated.
  • IL * Iin * ⁇ I ** (2)
  • the input voltage is replaced with the target input current Iin *.
  • the detected value Vin may be used, and therefore the boost control target reactor current IL * during the boost control operation can be set by the following equation (3) (step 4 (S04)).
  • IL ** Vin ⁇ I ** (3) Therefore, the peak current Iref * can be expressed by the following equation (4) by substituting equation (3) into equation (1).
  • the boost control peak current calculation unit 24a further adds the ideal value Vin_ref of the input voltage generated by the power supply control unit 2 and the input voltage detection value to the peak current Iref * of the equation (4) in the peak current control.
  • the boost control peak current Iref * in the peak current control expressed by the following equation (5) is calculated (step 5 (S05)).
  • the correction coefficient (Vin_ref / Vin) 2 of the above formula (5) will be described later.
  • the reactor current IL detected by the current detection circuit 6 of the power supply main circuit unit 1 is fetched (step 6 (S06)), and the reactor current IL and Peak current control is performed using the peak current Iref * obtained by the boost control peak current calculation unit 24a (step 7 (S07)).
  • the peak current control unit 25a is configured so that the reactor current IL is equal to the above-described equation (4) in the state where the first switching element Q1 is always turned on in the on / off signal generation unit 26.
  • the second switching element Q2 is controlled to be turned on at the moment when the boost control peak current Iref * obtained in step S3 is reached, and the reactor current IL is reduced. At the moment when the reactor current IL reaches zero, the second switching element Q2 is turned on.
  • a signal for controlling the operation of the switch control unit 26a is output so as to increase the reactor current IL by controlling the second switching element Q2 to be off (step 7 (S07)).
  • the switch control unit 26a supplies a switch signal for turning on / off to the second switching element Q2 constituting the step-up arm and a switch signal for always turning on the first switching element Q1. Generate and output (step 8 (S08)).
  • step 3 (S03) when the comparison determination unit 22 determines that the input voltage detection value Vin is equal to or higher than the output voltage detection value Vo (Vin ⁇ Vo), a step-down control operation is performed (step 3 (S03)).
  • a current corresponding to the output current Io flows through the reactor L, so the step-down control target reactor current IL * controls the current corresponding to the output current Io. Therefore, the step-down control peak current calculation unit 24b first calculates the step-down control target reactor current IL * by the following equation (6) using the output current Io and the output control amount I ** described above (step 10 ( S10)).
  • IL ** Io ⁇ I ** (6)
  • the output current Io is the target input current Iin *, the input voltage detection value Vin, and the output It can convert by following Formula (7) using the voltage detection value Vo.
  • Io (Vin ⁇ Iin *) / Vo (7) Therefore, step-down control target reactor current IL * can be expressed by equation (8) using equations (5) and (6).
  • IL * (Vin ⁇ Iin *) / Vo ⁇ I ** (8)
  • the target input current Iin * is replaced with the target input current Iin *.
  • the input voltage detection value Vin may be used, and therefore the step-down control target reactor current IL * during the step-down control operation can be set by the following equation (9) (step 9 (S09)).
  • IL * Vin 2 / Vo ⁇ i ** (9) Therefore, the peak current Iref * can be expressed by the following equation (10) by substituting equation (9) into equation (1).
  • Iref * (2 ⁇ Vin 2 / Vo) ⁇ I ** (10)
  • the step-down control peak current calculation unit 24b adds the ideal value Vin_ref of the input voltage generated by the power supply control unit 2 and the input voltage detection value to the peak current Iref * of the equation (9).
  • the step-down control peak current Iref * in the peak current control represented by the following equation (11) is calculated by multiplying the correction coefficient obtained by squaring the ratio with Vin (step 10 (S10)).
  • the correction coefficient (Vin_ref / Vin) 2 of the above equation (11) will be described later.
  • the reactor current IL detected by the current detection circuit 6 of the power supply main circuit unit 1 is fetched (step 11 (S11)), and the reactor current IL and Peak current control is performed using the peak current Iref * obtained by the step-down control peak current calculation unit 24b (step 12 (S12)).
  • the peak current control unit 25b is configured so that the reactor current IL is equal to the above equation (9) in the state where the second switching element Q2 is always turned off in the on / off signal generation unit 26.
  • the first switching element Q1 is controlled to be turned off, the reactor current IL is decreased, and at the moment when the reactor current IL reaches zero, The switching element Q1 is controlled to be turned on, and a signal for controlling the operation of the switch control unit 26b is output so as to increase the reactor current IL (step 12 (S12)).
  • the switch control unit 26b In response to this, the switch control unit 26b generates an on / off switch signal for the first switching element Q1 constituting the step-down arm and a switch signal for always turning off the second switching element Q2. (Step 13 (S13)).
  • the reactor current is controlled during the step-up and step-down control operations of the converter 5, the input current waveform can be brought close to the input voltage waveform, and power factor improvement control is executed.
  • the correction coefficient (Vin_ref / Vin) 2 used in the equations (5) and (11) will be described below.
  • the peak current Iref * in the conventional peak current control is set by the above-described equation (4).
  • control is performed using the peak current Iref * of Equation (4), when a voltage dip or the like that decreases the input voltage occurs when another device connected to the same AC line is activated, the input voltage Since the detection value Vin also decreases, the peak current Iref * also decreases.
  • FIG. 6 is a waveform diagram showing fluctuations in the output voltage detection value Vo when the input voltage fluctuates when control is performed using the conventional peak current iref * represented by Expression (4).
  • the horizontal axis indicates time
  • the upper waveform indicates the peak current Iref *
  • the lower waveform indicates the output voltage detection value Vo.
  • the input voltage detection value Vin is the gain of the power supply main circuit unit 1 regardless of the step-up control operation and the step-down control operation, and the gain of the power supply control unit 2 as shown in the equation (4). This is due to the fact that That is, when considering a round-trip transfer function of the power supply, when the input voltage fluctuates, the influence is given by the square of Vin.
  • control may be performed so that the gain of the round trip transfer function of the power supply does not change. That is, when the input voltage can be controlled in an ideal sine wave form, the gain Gr of the power supply round trip function is expressed by the following equation (12) using the ideal value Vin_ref of the input voltage.
  • Gr Vin_ref ⁇ 2 ⁇ Vin_ref ⁇ I ** (12)
  • the gain G of the circuit transfer function of the power supply when the input voltage fluctuates due to a voltage dip or the like is expressed by the following equation (13) using the input voltage detection value Vin.
  • G Vin ⁇ 2 ⁇ Vin ⁇ i ** (13)
  • FIG. 7 shows fluctuations in the detected output voltage Vo when the input voltage fluctuates when controlled using the peak current iref * shown in the equation (5) or the equation (11) corrected with the correction coefficient (Vin_ref / Vin) 2.
  • FIG. 7 the horizontal axis indicates time, the upper waveform indicates the peak current iref *, and the lower waveform indicates the output voltage detection value Vo.
  • the peak current iref * in FIG. 7 in the case where the correction is performed is larger than that in FIG. 6 in the case where the correction is not performed.
  • fluctuations in the output voltage detection value Vo are suppressed.
  • the waveform shape of the peak current iref * is one of the major features.
  • the peak current iref * is controlled by formula (5) or formula (11)
  • the peak current iref * waveform is set larger than the normal level and controlled.
  • the waveform of the peak current iref * is controlled to be set smaller than the normal level.
  • the correction coefficient (Vin_ref / Vin) 2 in the equations (5) and (11) is characterized in that the control is always performed regardless of the presence or absence of the input voltage fluctuation.
  • This coefficient is 1, which is the conventional peak current iref * expression (4). If there is a fluctuation in the input voltage, it is corrected according to this coefficient regardless of the magnitude of the fluctuation, and the fluctuation control is detected by detecting the fluctuation range. There is no need to switch.
  • the ideal control method is performed by multiplying the correction coefficient (Vin_ref / Vin) 2 of the equation (5) or the equation (11) of the peak current iref *.
  • the peak current iref * is increased by a predetermined value or a correction coefficient corresponding to a predetermined value depending on a value that decreases.
  • the control may be such that the peak current iref * is reduced by a constant value or a predetermined correction coefficient corresponding to the increased value. Any control is possible as long as the value of the peak current iref * is controlled to be opposite to the change in the input voltage fluctuation.
  • the power supply control unit 2 always captures the input voltage detection value Vin (instantaneous value). Since the input voltage detection value Vin has a signal shape obtained by full-wave rectification of the AC input voltage Vac, as shown in FIG. 8 illustrated as an example at 50 Hz, the input voltage detection value Vin has a waveform shape folded at 0V.
  • the input voltage detection value Vin (instantaneous value) is the smallest value near 0 V, and the frequency of the AC input voltage Vac can be determined by the time interval between this minimum value and the minimum value at the next timing.
  • a count is made from the minimum value of the input voltage detection value Vin for each sampling period of input voltage detection inside a control IC such as a microcomputer, and a count value (cnt) prepared in advance in a table inside the microcomputer. ) And the ideal value (Vin_ref) of a sine wave that has a one-to-one correspondence.
  • a method of generating an ideal value of a sine wave (Vin_ref) using a table stored in a control IC such as a microcomputer is shown, but the present invention is not limited to this.
  • a method of calculating a wave to obtain an ideal value (Vin_ref) of the sine wave may be used.
  • control units 25a and 25b and the on / off signal generation unit 26 are divided into blocks for each function, such control of each function can be realized by a control IC such as a microcomputer using a control program.
  • the present invention can also be applied to a simple boost converter in which the output voltage is always controlled to be larger than the input voltage. Needless to say, the present invention can be applied to all converters that control the peak current of the reactor.
  • the power conversion device including the H-type bridge buck-boost converter 5 that converts AC input into DC output includes the power supply control unit 2 that controls the reactor current IL.
  • AC is controlled by controlling the switching elements Q ⁇ b> 1 and Q ⁇ b> 2 of the converter 5 while switching between step-up control and step-down control based on a comparison of the magnitude of the input voltage detection value Vin and the output voltage detection value Vo.
  • Power factor correction control PFC
  • the calculation method is switched between the step-up control operation and the step-down control operation so that the target input current Iin * in the PFC control has the same phase as the pulsating voltage
  • the boost control target reactor current IL * is controlled based on the equation (6), and during the step-down control operation, Since a current corresponding to the output current Io flows through the reactor L, the step-down control target reactor current IL * is adjusted to be controlled based on the equation (9), thereby adjusting the reactor current IL flowing through the reactor L, Since the AC input current Iac has the same phase and waveform as the AC input voltage Vac, the power factor can be improved.
  • the boost control and step-down control peak current Iref * is multiplied by the square of the ratio of the ideal value (Vin_ref) of the input voltage and the detected input voltage detection value Vin, the output waveform even when the input voltage fluctuates. Fluctuations can be suppressed. Furthermore, since this power converter is composed of a single-stage converter 5 and uses peak current control, the number of components is small, low cost, and high efficiency can be realized.
  • the control method of the reactor current IL is the peak current control method.
  • the present invention is not limited to such a peak current control method.
  • the target reactor current iL * As shown in FIG. 9, the target reactor current iL *
  • the peak current Iref * is determined so that the target reactor current IL * is located at the center position between the upper limit peak current Iref1 * and the lower limit peak current Iref2 * of the divided voltage value. It is also possible to apply a window comparator control system that increases or decreases the reactor current IL between the peak currents Iref1 * and Iref2 *.
  • the power supply control unit of the converter that performs the power factor improvement control by controlling the reactor current is supplied with the input voltage generated by the power supply control unit.
  • the control is performed by setting the peak current multiplied by the correction coefficient obtained by squaring the ratio between the ideal value and the detected value of the input voltage, the square of this ratio is 1 when there is no input voltage fluctuation.
  • the power factor improvement control is performed as usual and the input voltage fluctuates, the ratio between the ideal input voltage value and the detected input voltage value changes, and the power factor corresponding to the amount of change in this ratio Since the improvement control is executed, there is an effect that an appropriate correction according to the input voltage fluctuation is possible.
  • the converter 5 includes the diodes D1 and D2 and the switching elements Q1 and Q2 has been described.
  • the circuit block diagram of the power conversion device according to another embodiment of FIG. the converter 51 may be configured to change the diodes D1 and D2 to switching elements Q3 and Q4 such as FET elements and IGBT elements.
  • switching elements Q3 and Q4 such as FET elements and IGBT elements.
  • FIG. FIG. 12 is a circuit block diagram illustrating an overall configuration of the power conversion device according to the second embodiment
  • FIG. 13 is a circuit block diagram illustrating a configuration of a power supply control unit of the power conversion device.
  • an LED lighting apparatus in which a plurality of LEDs (Light Emitting Diodes) 90 are connected in series is connected to the power supply main circuit unit 1 as a load. Yes.
  • the LED current detection circuit 91 is added as a detection circuit for detecting LED current ILED which flows into LED with respect to the circuit structure of FIG. 1 (FIG. 1).
  • the output control amount calculation unit 21 uses the LED current ILED detected by the LED current detection circuit 91 instead of the output voltage detection value Vo and the target output voltage Vo *, The target output current ILED * is input. Since other components are the same as those in the first embodiment, the description thereof is omitted.
  • the LED current ILED flowing through the LED 90 can be controlled by controlling the reactor current IL as in the first embodiment.
  • the dimming function for adjusting the amount of light is mounted on the LED illumination, the dimming function is also realized by making the target output current ILED * variable from an external device. be able to.
  • connection method of the LED serving as the load 90 is not limited to simply connecting in series, and may be parallel connection or series-parallel connection.
  • the load 90 may be another light source such as an organic EL or a laser diode.
  • the LED current ILED detected by the LED current detection circuit is fed back to the power supply control unit, and the output control amount
  • the calculation unit controls the LED current ILED to be the target output current ILED *, and the switching elements Q1 and Q2 are turned on / off by the peak current calculation unit, the peak current control unit, and the on / off signal generation unit, as in the first embodiment. By controlling, it is possible to suppress flickering of the LED light amount even when the input voltage fluctuates.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Une unité de commande d'alimentation électrique (2) du dispositif de conversion de puissance électrique commande une tension de sortie (Vo) en effectuant une commande de marche/arrêt de composants de commutation (Q1, Q2) sur la base d'une valeur de détection de tension d'entrée (Vin), de la valeur de détection de tension de sortie (Vo) et d'un courant de réacteur (IL), et commande le courant de réacteur (IL) de telle sorte qu'une forme d'onde de courant d'entrée s'approche d'une forme d'onde de tension d'entrée, de manière à exécuter une commande d'amélioration de facteur de puissance. L'unité de commande d'alimentation électrique effectue la commande d'amélioration de facteur de puissance en effectuant une correction appropriée en réponse à une variation de la tension d'entrée de sorte que l'amplitude d'une variation du courant de réacteur (IL) s'oppose à celle de la variation de la tension d'entrée (Vin). Par conséquent, même dans le cas d'une variation de la tension d'entrée (Vin), une opération d'élévation/abaissement de tension stable peut être effectuée sans variation de la tension de sortie (Vo).
PCT/JP2016/075989 2016-01-22 2016-09-05 Dispositif de conversion de puissance électrique et son procédé de commande WO2017126154A1 (fr)

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JP2020120472A (ja) * 2019-01-22 2020-08-06 株式会社Ｓｏｋｅｎ Ｄｃｄｃコンバータの制御装置
CN111989854A (zh) * 2018-04-17 2020-11-24 株式会社电装 电力转换装置的控制装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI753801B (zh) * 2021-03-18 2022-01-21 通嘉科技股份有限公司 可改變同步整流開關之最小開啟時間的控制方法、以及相關之同步整流控制器

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JP2004120940A (ja) * 2002-09-27 2004-04-15 Texas Instr Japan Ltd Ｄｃ−ｄｃコンバータ
JP2012085397A (ja) * 2010-10-07 2012-04-26 Nippon Soken Inc 電力変換装置
JP2015154692A (ja) * 2014-02-19 2015-08-24 三菱電機株式会社 電力変換装置

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Publication number Priority date Publication date Assignee Title
JP2004120940A (ja) * 2002-09-27 2004-04-15 Texas Instr Japan Ltd Ｄｃ−ｄｃコンバータ
JP2012085397A (ja) * 2010-10-07 2012-04-26 Nippon Soken Inc 電力変換装置
JP2015154692A (ja) * 2014-02-19 2015-08-24 三菱電機株式会社 電力変換装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111989854A (zh) * 2018-04-17 2020-11-24 株式会社电装 电力转换装置的控制装置
CN111989854B (zh) * 2018-04-17 2023-10-20 株式会社电装 电力转换装置的控制装置
JP2020120472A (ja) * 2019-01-22 2020-08-06 株式会社Ｓｏｋｅｎ Ｄｃｄｃコンバータの制御装置
JP7235517B2 (ja) 2019-01-22 2023-03-08 株式会社Soken Ｄｃｄｃコンバータの制御装置

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