WO2016051487A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
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- WO2016051487A1 WO2016051487A1 PCT/JP2014/076016 JP2014076016W WO2016051487A1 WO 2016051487 A1 WO2016051487 A1 WO 2016051487A1 JP 2014076016 W JP2014076016 W JP 2014076016W WO 2016051487 A1 WO2016051487 A1 WO 2016051487A1
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4283—Arrangements for improving power factor of AC input by adding a controlled rectifier in parallel to a first rectifier feeding a smoothing capacitor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a power conversion device that converts AC power into DC power.
- the DC power supply device disclosed in Patent Document 1 includes a rectifying unit that rectifies an AC voltage, a voltage doubler rectifier circuit, a switching unit that short-circuits the AC power source via a reactor, a control unit that short-circuits or opens the switching unit, a load Storage means for storing the drive pattern of the switching means corresponding to the above, and the switching means is operated with the drive pattern stored in advance.
- the DC power supply device of Patent Document 2 below includes a rectifier circuit, a reactor connected to the rectifier circuit, a switching unit that short-circuits the AC power supply via the reactor, a short-circuit timing storage unit that stores a short-circuit timing of the switching unit, An inductance storage unit that stores the inductance value of the reactor, a switching control unit that performs control to short-circuit or open the switching unit, and an inductance estimation unit are provided.
- a short circuit is performed based on the short circuit timing stored in the short circuit timing storage unit, the inductance value of the reactor estimated by the inductance estimation unit, and the voltage and current information detected by the detection means.
- the switching unit is controlled or the short circuit timing stored in the short circuit timing storage unit, the inductance value stored in the inductance storage unit, and the voltage and current information detected by the detection means are determined. Based on this, the duration of the short circuit is determined and the switching unit is controlled.
- Patent Document 2 requires a complicated calculation that takes into account fluctuations in the inductance of the reactor. For this reason, there is a problem that a design load for obtaining a desired waveform shape, power factor, harmonics, and boosting performance is increased, and it takes a long time to calculate the duration of the short circuit.
- This invention is made in view of the above, Comprising: Obtaining the power converter device which can aim at the improvement of a power factor, suppression of a harmonic component, or suppression of a circuit loss, reducing a design load. Objective.
- a power converter includes a rectifier that converts AC power from an AC power source into DC power, and a short-circuit unit that short-circuits the AC power source via a reactor. And a control unit that controls the short-circuit unit during a half cycle of the AC power source, and a correction amount using the inductance of the reactor is set in the control unit, and the control unit includes at least a power source The on-time and off-time of a plurality of switching pulses are changed using the detected current value and the correction amount, and the on / off operation of the short-circuit portion is controlled using the changed plurality of switching pulses.
- the power conversion device has an effect that power factor can be improved, harmonic components can be suppressed, or circuit loss can be suppressed while reducing the design load.
- FIG. 1 is a diagram illustrating a configuration example of a power conversion device 100 according to an embodiment of the present invention.
- a rectifier 3 that converts AC power from an AC power source 1 that is a power source into DC power
- a reactor 2 that is connected between the AC power source 1 and the rectifier 3, and a power source voltage that detects a power source voltage Vs of the AC power source 1
- the control unit 20 can handle the detection unit 7, a current detection element 9 connected between the reactor 2 and the rectifier 3 to detect the current value at the connection position, and a voltage proportional to the current detected by the current detection element 9.
- the control unit 20 generates the drive signal Sa2 and controls the opening / closing operation of the short-circuit unit 30 with the generated drive signal Sa2.
- the reactor 2 is connected to the AC power supply 1 side from the short-circuit portion 30 and is inserted between one input end of the rectifier 3 and the AC power supply 1.
- a current transformer or a shunt resistor is used for the current detection element 9.
- the current detection unit 8 is realized by an amplifier or a level shift circuit.
- FIG. 2 is a diagram showing a configuration example of the rectifier 3 and the short-circuit unit 30 shown in FIG.
- the rectifier 3 is a smoothing circuit that smoothes the voltage of a full-wave rectified waveform output from the rectifier circuit 4 that is connected between the output terminals of the rectifier circuit 4 and the rectifier circuit 4 that is configured by a diode bridge 31 that is a combination of four diodes. And a capacitor 5.
- a current detection unit 10 including a current detection element 9 and a current detection unit 8 is shown, and the current detection unit 10 detects the power supply current Is of the AC power supply 1.
- the DC voltage detection unit 6 is realized by an amplifier or a level shift circuit, detects the voltage across the smoothing capacitor 5, and detects the detected voltage as a DC output voltage Vdc that is a voltage detection value within a low voltage range that can be handled by the control unit 20. Convert to and output.
- the configuration of the rectifier circuit 4 is not limited to this, and a metal oxide semiconductor field effect transistor which is a diode-connected unidirectional conducting element may be combined.
- the short-circuit unit 30 which is a bidirectional switch is configured by a diode bridge 31 connected in parallel to the AC power source 1 via the reactor 2 and a short-circuit element 32 connected to both output terminals of the diode bridge 31.
- the short-circuit element 32 is a metal oxide semiconductor field effect transistor
- the gate of the short-circuit element 32 is connected to the pulse transmission unit 24, and the short-circuit element 32 is turned on / off by the drive signal Sa2 from the pulse transmission unit 24.
- the short-circuit element 32 is turned on, the AC power supply 1 is short-circuited via the reactor 2 and the diode bridge 31.
- the control unit 20 is constituted by a microcomputer, and generates a drive signal Sa that is a switching pulse for controlling the short-circuit element 32 based on the DC output voltage Vdc and the power supply voltage Vs, and a pulse pattern generation This is a pulse pattern composed of a plurality of pulses based on the data storage unit 22 for storing data necessary for calculation in the unit 23, the data read from the data storage unit 22, and the drive signal Sa from the drive signal generation unit 21.
- a pulse pattern generation unit 23 that generates the drive signal Sa1 and a pulse transmission unit 24 that converts the drive signal Sa1 from the pulse pattern generation unit 23 into a drive signal Sa2 and transmits the drive signal Sa2 to the short circuit unit 30 are included.
- the data stored in the data storage unit 22 includes data related to an approximate expression of a function that associates the on-duty of each drive signal Sa1 and the pulse number, and a function that associates the off-duty of each drive signal Sa1 and the inter-pulse number.
- the on-duty is the ratio of the on-time of each drive signal Sa1 to the on-time of the drive signal Sa
- the off-duty is the ratio of the off-time of each drive signal Sa1 to the on-time of the drive signal Sa. Details of these data will be described later.
- the pulse pattern generation unit 23 is changed to an on / off time changing unit 23a that changes the on time and the off time of a plurality of switching pulses that control the short circuit unit 30 based on at least the detection value and the correction amount of the power supply current Is. And a pulse dividing unit 23b that divides the drive signal Sa according to the ON time and the OFF time and generates the drive signal Sa1. Details of the correction amount will be described later.
- the pulse transmission unit 24 includes a level shift circuit, performs voltage level shift so that gate driving can be performed, converts the drive signal Sa1 from the pulse pattern generation unit 23 into a drive signal Sa2 that is a gate drive signal, and converts the drive signal Sa1 to the short circuit unit 30. Output.
- FIG. 3 is a diagram showing a simple circuit composed of the reactor 2, the short circuit unit 30, the rectifier circuit 4, and the smoothing capacitor 5.
- FIG. 3 shows a current path when the short circuit unit 30 is turned on and off.
- FIG. 4 is a diagram showing a waveform of the power supply current Is when the short-circuit element 32 is switched once in the positive electrode side half cycle of the AC power supply 1.
- FIG. 4 shows a drive signal Sa1 that is a single pulse when the short-circuit portion 30 is switched once during a half cycle of the power source.
- the stored energy is released to the load 11 side at the same time when the short-circuit unit 30 is turned off, rectified by the rectifier circuit 4, and transferred to the smoothing capacitor 5.
- the power source current Is flows through the current path of FIG.
- the energization angle of the power supply current Is can be expanded as compared with the passive mode without power factor improvement, and the power factor can be improved.
- FIG. 5 is a diagram showing a waveform of the power supply current Is when the drive signal Sa is not divided into a plurality of pulses.
- the drive signal Sa1 is turned on at the timing when the drive signal Sa is turned on, and during the on period t of the drive signal Sa, the drive signal Sa1 is also turned on only for the same period as the on period t of the drive signal Sa.
- the on period t is a period from when the drive signal Sa is turned on to when it is turned off. Accordingly, the short-circuit time of the short-circuit element 32 becomes longer in direct proportion to the ON period t of the drive signal Sa when the power supply voltage Vs is boosted, and the power supply current Is increases.
- the drive signal Sa When the power supply current Is reaches the set value, the drive signal Sa is turned off, and the drive signal Sa1 is turned off at the timing when the drive signal Sa is turned off.
- the short-circuiting time of the short-circuiting element 32 When the short-circuiting time of the short-circuiting element 32 is increased, more energy can be stored in the reactor 2, but the peak of the power supply current Is increases, so that the power factor deteriorates, the harmonic component increases, and the circuit loss.
- FIG. 6 is a diagram showing a waveform of the power supply current Is when the drive signal Sa is divided into a plurality of pulses.
- the upper threshold shown in FIG. 6 is a threshold that regulates the upper limit of the short-circuit current that flows when the short-circuit unit 30 is turned on, and the lower threshold is a threshold that is set to a value smaller than the upper threshold.
- the current control range w represents the width from the upper threshold value to the lower threshold value.
- FIG. 6 shows a plurality of drive signals Sa1 generated in a half cycle of the power supply so that the peak value of the power supply current Is falls within the current control range w.
- the drive signal Sa1 is turned on to increase the power supply current Is, and as the power supply current Is increases, the current detection voltage Vis, that is, the current detection value detected by the current detection unit 8 increases. .
- the drive signal Sa1 is turned off. As a result, the power supply current Is decreases and the current detection value decreases.
- the drive signal Sa1 is turned on again, the power supply current Is increases again, and the current detection value detected by the current detection unit 8 is detected. Rises.
- the peak value of the current detection voltage Vis within the on-period t of the drive signal Sa that is, the peak value of the power supply current Is becomes the current control range w. Controlled within. Therefore, even when the DC output voltage Vdc is boosted to a relatively high value, the peak value of the power supply current Is during the on-period t of the drive signal Sa is suppressed.
- FIG. 7 is a diagram showing a waveform of the power supply current Is when the drive signal Sa is divided into a plurality of pulses in the positive electrode half cycle and the negative electrode half cycle.
- the ON duty of each drive signal Sa1 is associated with the pulse number.
- the data obtained by associating the off-duty of each drive signal Sa1 with the number between pulses is obtained.
- the obtained data is stored in the data storage unit 22.
- the drive signal Sa ⁇ b> 1 having a pulse pattern as shown in FIG.
- the pulse pattern generation unit 23 generates the drive signal Sa1 so that the peak value of the power supply current Is falls within the current control range w even when the load changes by moving the on / off duty by a correction amount corresponding to the load. To do.
- FIG. 8 is a diagram showing the relationship between the data stored in the data storage unit 22 and the drive signal Sa1 generated by the pulse pattern generation unit 23.
- FIG. 8 shows six drive signals Sa1 in which the drive signal Sa is generated in the on period t in the positive half cycle, and six drive signals Sa in which the drive signal Sa is generated in the on period t in the negative half cycle. Sa1 is shown.
- the first drive signal Sa1 is turned on when a certain time Tdl has elapsed from the zero cross point T0 when the power supply voltage Vs rises.
- Ton (1) represents the on time of the first drive signal Sa1 generated in the positive electrode half cycle, that is, the time from when the first drive signal Sa1 rises to when it falls.
- Ton (2) is the on time of the second drive signal Sa1
- Ton (3) is the on time of the third drive signal Sa1
- Ton (4) is the on time of the fourth drive signal Sa1
- Ton (5 ) Represents the on time of the fifth drive signal Sa1
- Ton (6) represents the on time of the sixth drive signal Sa1.
- On_duty (1) to on_duty (6) indicated by reference symbol A is one of the data stored in the data storage unit 22, and associates the on-duty and pulse number of each drive signal Sa1.
- the number indicated by symbol B is the pulse number.
- the first drive signal Sa is turned on when a certain time has elapsed from the zero cross point when the power supply voltage Vs drops.
- Toff (1) is the time from when the first drive signal Sa1 generated within the negative half cycle falls to the time when the second drive signal Sa1 rises, that is, the first drive signal Sa1 and the second drive signal Sa1. It represents the off time with respect to the drive signal Sa1.
- Toff (2) is an off time between the second drive signal Sa1 and the third drive signal Sa1
- Toff (3) is an off time between the third drive signal Sa1 and the fourth drive signal Sa1.
- Time, Toff4 represents an off time between the fourth drive signal Sa1 and the fifth drive signal Sa1
- Toff (5) represents an off time between the fifth drive signal Sa1 and the sixth drive signal Sa1. .
- Off_duty (1) to off_duty (5) indicated by reference symbol C is one of the data stored in the data storage unit 22, and associates the off-duty of each drive signal Sa1 with the number between pulses. .
- the number indicated by the symbol D is the interpulse number.
- (1) is the on-duty of the on-time Ton (x) of the x-th drive signal Sa1 within the half cycle of the power supply with respect to the on-time Ton of the drive signal Sa.
- N is the total number of drive signals Sa1 generated in the half cycle of the power supply.
- Equation (2) is the off duty of the off time Toff (y) between the xth drive signal Sa1 and the x ⁇ 1th drive signal Sa1 within the half cycle of the power supply with respect to the on time Ton of the drive signal Sa. .
- N is the total number of drive signals Sa1 generated in the half cycle of the power supply.
- FIG. 9 is a diagram showing the change over time of the on-duty during the half cycle of the power supply calculated using the equation (1).
- the horizontal axis represents the pulse number x of the second to Nth drive signals Sa1 among the N drive signals Sa1 generated within the half cycle of the power supply, and the vertical axis represents 2 obtained by the equation (1). It represents the on-duty with respect to the Nth to Nth drive signals Sa1.
- the curve connecting the triangular points is the on-duty before the movement, and the curve connecting the circular points is the on-duty after the movement.
- FIG. 9 it can be seen that the on-duty when the peak value of the power supply current Is falls within the current control range w draws a downward parabola.
- FIG. 10 is a diagram showing the change over time of the off-duty during the half cycle of the power supply calculated using the equation (2).
- the horizontal axis represents the inter-pulse number y of each drive signal Sa1 generated within the half cycle of the power supply, and the vertical axis represents the off-duty value for the first to Nth drive signals Sa1 obtained by equation (2). It is.
- a curve connecting triangular points is an off-duty before movement, and a curve connecting circles is an off-duty after movement. As shown in FIG. 10, it can be seen that the off-duty when the peak value of the power supply current Is falls within the current control range draws a parabola that protrudes upward.
- the on-duty and off-duty of the plurality of drive signals Sa1 generated in the half cycle of the power supply change with time, and the tendency of each change is different. Focusing on this point, among the plurality of drive signals Sa1 generated in the power supply half cycle, the on-duty of the drive signal Sa1 in the specific region and the off-duty of the plurality of drive signals Sa1 generated in the power supply half cycle are: It can be expressed by the following approximate expression.
- equation (1) can be approximated by a quadratic equation shown in equation (3).
- A1, B1, C1 shows each constant of an approximate expression.
- Equation (2) can be approximated by a quadratic equation shown in equation (4).
- A1, B1, C1 shows each constant of an approximate expression.
- on-duty and off-duty may be defined by approximate equations of second order or higher.
- the on-duty of the first drive signal Sa1 which is a pulse outside the specific region, can be expressed by equation (5).
- N is the total number of drive signals Sa1 generated in the half cycle of the power supply.
- the error of the approximate expression can be absorbed by using the equation (5) without setting the ON duty.
- an approximate expression of a function that associates the on-duty of each drive signal Sa1 with the pulse number and an approximate expression of a function that associates the off-duty of each drive signal Sa1 with the inter-pulse number can be obtained.
- Data regarding the functioned data and the constants of the approximate expression are stored in the data storage unit 22, and are used when the pulse pattern generation unit 23 generates the drive signal Sa1.
- FIG. 11 is a diagram showing the relationship between the load Po and the correction coefficient Cf.
- the load Po on the horizontal axis represents, for example, the power value supplied to the load 11 shown in FIG. 3, and the correction coefficient Cf on the vertical axis represents the correction coefficient Cf corresponding to the value of the load Po.
- the correction coefficient Cf is a value obtained by analysis or actual machine test. For example, as shown in FIG. 11, the correction coefficient Cf is a value adjusted to show a constant value in a region where the load Po is low and to increase as the load Po increases in a region where the load Po is high.
- FIG. 12 is a diagram showing the relationship between the power supply current Is flowing through the reactor 2 and the inductance L of the reactor 2.
- the horizontal axis represents the power supply current Is flowing through the reactor 2, and the vertical axis represents the inductance L of the reactor 2.
- the inductance L shows a constant value.
- the inductance L tends to decrease as the power supply current Is increases.
- the on / off duty correction amount Cq shown in FIGS. 9 and 10 can be expressed by equation (9).
- Cf is a correction coefficient shown in FIG. 11
- L is an inductance obtained by the equation (8)
- La is a change amount of the inductance L.
- the absolute value of the correction amount Cq increases as the correction coefficient Cf increases.
- the correction coefficient Cf is derived from the amount of change in the inductance L with respect to the increase in the power supply current Is as shown in FIG. Therefore, if the value of the power supply current Is or the load Po is known, the correction amount Cq can be derived.
- the on / off time changing unit 23a the approximate expression of the on / off duty stored in the data storage unit 22, the value of the load Po, which is the power value calculated based on the power supply voltage Vs and the current detection voltage Vis, , (9), the correction amount Cq is obtained, the on-duty corresponding to the pulse number x is moved by the correction amount Cq as shown in FIG. 9, and the inter-pulse number y as shown in FIG. The off-duty is moved by the correction amount Cq.
- the on / off time changing unit 23a determines the amount of movement of the on / off duty corresponding to the correction amount Cq on the x and y coordinates.
- the movement amount is a movement amount in the x-axis direction and a movement amount in the y-axis direction.
- the off-off time of the drive signal Sa1 can be obtained by multiplying the on-off duty after movement by the on-time of the drive signal Sa that is the original signal.
- FIG. 13 is a diagram illustrating a waveform of the power supply current Is that flows when the short-circuit unit 30 is controlled by the drive signal Sa1 before moving the on / off duty.
- FIG. 14 is a diagram illustrating a waveform of the power supply current Is that flows when the short-circuit unit 30 is controlled by the drive signal Sa1 after the on / off duty is shifted.
- the waveform of the power supply current Is before the correction is applied has a tendency that the peak value decreases to the right as shown in FIG.
- the peak value of the power supply current Is on the positive electrode side gradually decreases after rising to the positive electrode side in an overshooting manner with respect to the positive electrode upper limit threshold V THH (H) obtained in the previous analysis, It falls within the current control range from the threshold value V THH (H) to the positive electrode side lower limit threshold value V THH (L).
- the peak value of the supply current Is of the negative electrode side and gradually decreases after rising to the negative in a manner that overshoot the negative electrode side upper threshold V THL (H) obtained in advance analysis, the negative electrode side upper threshold V THL ( H) falls within the current control range from the negative side lower limit threshold V THL (L).
- the waveform of the power supply current Is after correction is applied, as shown in FIG. 14, the peak value of the power supply current Is is constant and within the current control ranges of the positive electrode side and the negative electrode side. It will fit. Note that the peak value of the power supply current Is after correction does not have to be constant. For example, it is only necessary that the degree of downward trend is smaller than that before correction.
- Patent Document 2 requires a complicated calculation in consideration of inductance variation, which causes an increase in design load and a long time required for calculation processing of a duration related to a short circuit.
- the fluctuation of the inductance of the reactor 2 due to the change of the instantaneous current can be offset. Therefore, it is possible to improve the power factor, suppress harmonic components, suppress an increase in circuit loss, or obtain a desired boosting capability without performing a complicated calculation as shown in Patent Document 2 above. is there.
- the on / off time changing unit 23a reads the approximate expression of the on / off duty stored in the data storage unit 22, and calculates the inductance L of the reactor 2 from the power value calculated based on the power supply voltage Vs and the current detection voltage Vis and the equation (8). Then, the correction amount Cq is obtained from the inductance L and the equation (9).
- the on / off time changing unit 23a the on duty corresponding to the pulse number x is moved by the correction amount Cq, the off duty is moved by the correction amount Cq, and the on / off time changing unit 23a Is multiplied by the ON time of the drive signal Sa, which is the original signal, to obtain the OFF / OFF time of the drive signal Sa1.
- the pulse dividing unit 23b generates the drive signal Sa1 by dividing the drive signal Sa with the changed on / off time.
- the control unit 20 simply generates the drive signal Sa1 corresponding to the change in the inductance L.
- the configuration example in which the correction amount Cq is obtained from the calculated load Po and the equations (8) and (9) has been described.
- the correction amount Cq may be obtained from the detected value of the power supply current Is and the equations (7) and (9).
- the configuration example in which the on / off duty is moved by the correction amount Cq shown in Equation (9) is shown, but instead of the correction amount Cq in Equation (9), Equation (7) or Equation (8) is used.
- the value of the inductance L obtained in the above may be used as the amount of movement of the on / off duty, and the design load of data set in the control unit 20 can be further reduced.
- the functions shown in the expressions (7) and (8) are not limited to the quadratic approximate expression but may be a quadratic or higher approximate expression.
- the configuration example in which both the on time and the off time are changed has been described.
- the driving signal Sa1 is divided by dividing the driving signal Sa by the on time or the off time, with the on time or the off time being a constant value. It may be generated.
- the reactor 2 is inserted between the AC power source 1 and the rectifier 3, and the rectifier 3 is connected to the AC power source 1 via the reactor 2. Therefore, the positional relationship among the rectifier 3, the reactor 2, and the short-circuit unit 30 is not limited to the configuration shown in the drawing. That is, the power conversion device 100 may have a configuration in which the power source current Is flows in the order of the AC power source 1, the reactor 2, the short-circuit unit 30, and the AC power source 1 at the time of a short circuit. 3 may be inserted, and the reactor 2 may be connected to the AC power source 1 via the rectifier 3.
- the present invention is not limited to this, and may be configured as follows.
- data obtained by functionalizing the on-time and off-time, or data representing the on-time and off-time by an approximate expression of second order or more is set in the on-off time changing unit 23a, and the on / off time changing unit 23a sets the correction amount Cq.
- the on-time and the off-time are changed by moving the on-time corresponding to the pulse number and the off-time corresponding to the inter-pulse number, and the pulse dividing unit 23b drives the drive signal with the changed on-time and off-time. Sa1 is generated.
- the on / off time changing unit 23a is set with a map table in which the on time and off time of each switching pulse, the pulse number of each switching pulse, and the inter-pulse number of each switching pulse are associated with each other.
- 23a may be configured to move the ON time corresponding to the pulse number and the OFF time corresponding to the inter-pulse number by the correction amount. This configuration can also reduce the slope of the change over time of the peak value of the power supply current Is.
- the power conversion device 100 includes the rectifier 3 that converts AC power from the AC power source 1 into DC power, and the short-circuit unit 30 that short-circuits the AC power source 1 via the reactor 2.
- a control unit 20 that controls the short-circuit unit 30 during a half cycle of the AC power source 1, and the control unit 20 is set with a correction amount Cq using the inductance of the reactor 2.
- the ON time and OFF time of the plurality of switching pulses are changed using the detected value of the power supply current Is and the correction amount Cq, and the ON / OFF operation of the short-circuit unit 30 is controlled using the changed plurality of switching pulses.
- control unit 20 calculates a correction amount Cq corresponding to the detected value of the power supply current Is using an approximate expression of a function in which the inductance value and the power supply current Is are associated, and the on-time is calculated by the calculated correction amount Cq. And change off time.
- the on / off time can be changed only by the correction amount Cq derived from the equations (7) and (9), and the design load for obtaining a desired waveform shape, power factor, harmonics, and boosting performance can be reduced. There will be no increase.
- control unit 20 uses an approximate expression of a function in which the inductance value and the power value are associated, and a correction amount Cq corresponding to the power value calculated from the detected value of the power source current Is and the detected voltage value of the AC power source 1. And the ON time and OFF time are changed by the calculated correction amount Cq.
- the on / off time can be changed only by the correction amount Cq derived from the equations (8) and (9), and the design load for obtaining a desired waveform shape, power factor, harmonics, and boosting performance can be reduced. There will be no increase.
- control unit 20 is set with a map table in which the on time, the off time, the pulse numbers of the plurality of switching pulses, and the inter-pulse numbers of the plurality of switching pulses are associated with each other.
- the ON time corresponding to the pulse number and the OFF time corresponding to the inter-pulse number are changed by Cq.
- the control unit 20 is set with data representing on-time and off-time as a function based on a plurality of switching pulse numbers, and the control unit 20 corresponds to a plurality of switching pulse numbers by the correction amount Cq. Change the on time and off time.
- the data expressed as a function is data that represents the on-time and off-time with approximate equations of second order or higher.
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
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Abstract
Description
図1は本発明の実施の形態に係る電力変換装置100の構成例を示す図である。電源部である交流電源1からの交流電力を直流電力に変換する整流器3と、交流電源1と整流器3との間に接続されたリアクタ2と、交流電源1の電源電圧Vsを検出する電源電圧検出部7と、リアクタ2と整流器3の間に接続され接続位置における電流値を検出する電流検出素子9と、電流検出素子9で検出された電流に比例した電圧を制御部20が取り扱い可能な低圧範囲内の電流検出電圧Visに変換して出力する電流検出部8と、リアクタ2を介して交流電源1を短絡する短絡部30と、交流電源1の半周期中に複数のスイッチングパルスである駆動信号Sa2を生成し、生成した駆動信号Sa2で短絡部30の開閉動作を制御する制御部20とを有する。
Claims (7)
- 交流電源からの交流電力を直流電力に変換する整流器と、
リアクタを介して前記交流電源を短絡する短絡部と、
前記交流電源の半周期中に、前記短絡部を制御する制御部と、
を備え、
前記制御部には、前記リアクタのインダクタンスを用いた補正量が設定され、
前記制御部は、少なくとも電源電流の検出値と前記補正量とを用いて、複数のスイッチングパルスのオン時間およびオフ時間を変更し、変更された複数のスイッチングパルスを用いて前記短絡部のオンオフ動作を制御する電力変換装置。 - 前記制御部は、前記インダクタンスと前記電源電流とを関連付けた関数の近似式を用いて、前記電源電流の検出値に対応した前記補正量を演算し、演算した前記補正量の分だけ前記オン時間および前記オフ時間を変更する請求項1に記載の電力変換装置。
- 前記制御部は、前記インダクタンスと電力値とを関連付けた関数の近似式を用いて、前記電源電流の検出値と前記交流電源の電圧検出値とにより算出される電力値に対応した前記補正量を演算し、演算した前記補正量の分だけ前記オン時間および前記オフ時間を変更する請求項1に記載の電力変換装置。
- 前記制御部には、前記オン時間と、前記オフ時間と、前記複数のスイッチングパルスのパルス番号と、前記複数のスイッチングパルスのパルス間番号とを対応付けたマップテーブルが設定され、
前記制御部は、前記補正量の分だけ、前記パルス番号に対応した前記オン時間と前記パルス間番号に対応した前記オフ時間とを変更する請求項1に記載の電力変換装置。 - 前記制御部には、前記オン時間および前記オフ時間を前記複数のスイッチングパルスの番号に基づく関数で表したデータが設定され、
前記制御部は、前記補正量の分だけ、前記番号に対応した前記オン時間および前記オフ時間を変更する請求項1に記載の電力変換装置。 - 前記関数で表した前記データは、前記オン時間および前記オフ時間を2次以上の近似式で表したデータである請求項5に記載の電力変換装置。
- 前記制御部はマイクロコンピュータで構成されている請求項1から請求項6の何れか1項に記載の電力変換装置。
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