WO2023068030A1 - 電力変換装置およびその制御方法 - Google Patents
電力変換装置およびその制御方法 Download PDFInfo
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- WO2023068030A1 WO2023068030A1 PCT/JP2022/037053 JP2022037053W WO2023068030A1 WO 2023068030 A1 WO2023068030 A1 WO 2023068030A1 JP 2022037053 W JP2022037053 W JP 2022037053W WO 2023068030 A1 WO2023068030 A1 WO 2023068030A1
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- duty ratio
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims description 13
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 15
- 238000010586 diagram Methods 0.000 description 18
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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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
- 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
Definitions
- the present disclosure relates to a power converter used in various electric devices and a control method thereof, and more particularly to a power converter including a DCDC converter.
- a conventional power converter will be described below.
- a conventional power conversion device has a first controller that calculates a target value of current flowing through the power conversion device so that the output voltage is equal to the output command voltage, and a converter current value that is fed back to the target current value.
- the output voltage is stabilized by using a current controller that outputs a signal for driving the power converter so that the current follows.
- Patent Document 1 is known as prior art document information related to the disclosure of this application.
- the first controller and the second controller operate based on the output voltage, so when the input voltage suddenly changes, the output voltage may become unstable and fluctuate greatly. have issues.
- an object of the present disclosure is to provide a power converter or the like that can stabilize the output voltage even if the input voltage fluctuates greatly.
- a power conversion device includes an input terminal, an output terminal, a switching element connected to the input terminal and the output terminal, and a DC power conversion device. and information indicating a target output voltage and a predetermined voltage for detecting a first voltage at the output terminal, a first current flowing through the conversion circuit, and a second voltage at the input terminal.
- control circuit that transmits a PWM signal for driving the switching element by performing a plurality of operations, the control circuit for bringing the first voltage closer to the output target voltage a first calculation for calculating a target current; a second calculation for calculating a first duty ratio for bringing the first current closer to the target current; and a second duty ratio based on the predetermined voltage and the second voltage. and a fourth operation of calculating the drive ratio of the PWM signal by using the first duty ratio and the second duty ratio, and the PWM signal having the drive ratio A signal is emitted to control the first voltage.
- a control method for a power conversion device is a control method for a power conversion device, wherein the power conversion device includes an input terminal, an output terminal, and an input terminal and the output terminal.
- a DCDC converter having a switching element connected thereto and provided with a conversion circuit for performing DC power conversion; a first voltage at the output terminal; a first current flowing through the conversion circuit; and a second voltage at the input terminal.
- control circuit that detects, acquires information indicating the output target voltage and the predetermined voltage, and executes a plurality of calculations to generate a PWM signal for driving the switching element
- the control method includes: a step of a control circuit executing a first operation for calculating a target current for bringing the first voltage closer to the output target voltage; performing a second calculation for calculating a duty ratio; performing a third calculation for calculating a second duty ratio by the control circuit based on the predetermined voltage and the second voltage; and performing a fourth operation of calculating a drive duty ratio of the PWM signal by using the first duty ratio and the second duty ratio; and controlling the first voltage by emitting a signal.
- feedback control using the value of the output voltage for the value of the output target voltage, and feed using the value of the input voltage for the value of the predetermined voltage Forward control is executed.
- the output voltage can be brought close to the predetermined voltage in a short time by the feedforward control.
- the output voltage can be maintained at a stable value.
- FIG. 1 is a first circuit block diagram showing a configuration of a power conversion device according to an embodiment
- FIG. FIG. 2 is a second circuit block diagram showing the configuration of the power conversion device according to the embodiment
- 1 is a first computational block diagram showing a configuration of a power conversion device according to an embodiment
- FIG. FIG. 2 is a second computational block diagram showing the configuration of the power conversion device according to the embodiment
- Third circuit block diagram showing the configuration of the power conversion device in the embodiment 1 is a block diagram showing an example of an output range of each operation in a control circuit of a power conversion device according to an embodiment and a diagram showing an example of a waveform of an output voltage of the power conversion device;
- FIG. 4 is a block diagram showing another example of the output range of each operation in the control circuit of the power conversion device according to the embodiment, and a diagram showing an example of a waveform of the output voltage of the power conversion device; Input voltage in the operation example of FIG. 6A (the output range of the second calculation unit is -0.5 to 0.5) and the operation example of FIG. 6B (the output range of the second calculation unit is -0.3 to 0.3) and the theoretical value of the maximum output voltage and an example of actual measurement
- FIG. 1 is a first circuit block diagram showing the configuration of a power conversion device 1 according to an embodiment.
- the power conversion device 1 includes an input terminal 2 , an output terminal 3 , a DCDC converter 4 and a control circuit 5 .
- the DCDC converter 4 is provided with a conversion circuit 7 having a switching element 6 .
- the DCDC converter 4 is connected to the input terminal 2 and the output terminal 3.
- the DCDC converter 4 also has a conversion circuit 7 which is connected to the input terminal 2 and the output terminal 3 .
- the conversion circuit 7 has a switching element 6, and the switching element 6 repeats a connection state and a disconnection state at a predetermined duty ratio, thereby stepping up or stepping down the DC voltage input from the input terminal 2. Then, DC power conversion is performed to supply a DC voltage from the output terminal 3 to the outside.
- the conversion circuit 7 is provided with a reactor 13, a smoothing capacitor 14, and a rectifying element 17, the details of which will be described with reference to FIG.
- the control circuit 5 detects a first voltage V1 at the output terminal 3, a first current I1 flowing through the conversion circuit 7, and a second voltage V2 at the input terminal 2. Also, the control circuit 5 transmits a PWM signal for controlling and driving the switching element 6 . Furthermore, the control circuit 5 acquires information on the output target voltage V0 and a predetermined voltage (the output target voltage V0 in the present embodiment) that serves as a reference for the input voltage in feedforward control, and executes a plurality of operations described later. do.
- the control circuit 5 includes hardware such as an A/D converter that acquires the voltage from a current sensor that detects current and the voltage at a predetermined location, a drive circuit that transmits a PWM signal, and a plurality of operations. It consists of a memory that holds information indicating a program, the output target voltage V0 and the predetermined voltage, and a processor that executes the program.
- the control circuit 5 executes a first calculation, a second calculation, a third calculation, and a fourth calculation as the plurality of calculations described above in order to output the first voltage V1 at the output terminal 3 at the output target voltage V0. .
- a target current I0 for bringing the first voltage V1 closer to the output target voltage V0 is calculated based on the first voltage V1 and the output target voltage V0.
- a first duty ratio for bringing the first current I1 closer to the target current I0 is calculated.
- the second duty ratio is calculated based on the second voltage V2 and the predetermined voltage (output target voltage V0 in this embodiment).
- the drive duty ratio of the PWM signal is calculated by using the first duty ratio and the second duty ratio.
- the current value of the output voltage with respect to the value of the output target voltage is used to perform feedback control by the first calculation and the second calculation for controlling the current value, and the predetermined voltage (this embodiment In the form of (2), feedforward control is executed by the third calculation using the input voltage value at the present time with respect to the value of the output target voltage).
- the first duty ratio PWM signal based on feedback control using the current output voltage value for the output target voltage value and the current input voltage for the output target voltage value
- the output voltage is controlled using both the second duty ratio PWM signal based on feedforward control using the value of .
- the output voltage value can be brought closer to the output target voltage value in a short period of time through feedforward control without repeating feedback control as in the conventional technology. . As a result of this, the output voltage can be maintained at a stable value.
- a power conversion device 1 provided on a vehicle body 9 of a vehicle 8 is connected to a first battery 10 and a second battery 11 . Then, the power conversion device 1 uses the power of the second battery 11 to charge the first battery 10 to the output target voltage V0. Also, the voltage of the first battery 10 is lower than the voltage of the second battery 11 .
- the vehicle control unit 12 mounted on the vehicle body 9 transmits a start signal S1 to the control circuit 5.
- the control circuit 5 receives the activation signal S1 at the timing T0, the control circuit 5 converts the first voltage V1 at the output terminal 3, the second voltage V2 at the input terminal 2, and the first current I1 flowing through the conversion circuit 7 at the timing T0. To detect. In other words, the control circuit 5 detects the voltage of the first battery 10 connected to the output terminal 3 and the voltage of the second battery 11 connected to the input terminal 2 .
- a current sensor such as a shunt resistor and a voltage amplifier circuit transmits a signal corresponding to the current flowing through the switching element 6 and the reactor 13 connected in series to the control circuit 5.
- the conversion circuit 7 includes, as an example of a configuration for step-down operation, a smoothing capacitor 14 connected between a connection point 15 between the reactor 13 and the output terminal 3 and the ground, the switching element 6 and the reactor 13. and a rectifying element 17 connected between the connection point 16 and the ground.
- a current sensor (not shown) transmits a signal corresponding to the current between the connection point 16 and the output terminal 3 to the control circuit 5 by the current sensor (not shown).
- a detection circuit such as an A/D converter provided in the control circuit 5 may perform the above detection of current and voltage.
- the rectifying element 17 may be replaced with a switching element (not shown).
- a switching element (not shown) that replaces the rectifying element 17 may perform opening and closing operations that are the opposite of those of the switching element 6 .
- control circuit 5 transmits a PWM signal for controlling and driving the switching element 6 .
- the driving circuit 18 included in the control circuit 5 may transmit the PWM signal.
- the control circuit 5 does not have to transmit the control signal S2, which is a PWM signal for turning the switching element 6 on and off. In that case, the control circuit 5 may transmit the control signal S2, which is a PWM signal having an initial time ratio preset as a predetermined time ratio.
- the control circuit 5 acquires information on the output target voltage V0.
- the output target voltage V0 may be a value stored in advance in a storage circuit (not shown) such as a memory that the control circuit 5 has.
- the output target voltage V0 may be transmitted from the vehicle control unit 12 to the control circuit 5 when the vehicle 8 is started.
- the control circuit 5 has, as a functional configuration, a first calculation section 5A that performs a first calculation, a second calculation section 5B that performs a second calculation, and a third calculation section that performs a third calculation. It has a section 5C and a fourth calculation section 5D for executing the fourth calculation. Each calculation is performed by a digital calculation in this embodiment.
- the first calculation unit 5A of the control circuit 5 compares the detected first voltage V1 at the output terminal 3 with the output target voltage V0. Furthermore, based on the difference between the first voltage V1 and the output target voltage V0, the first calculation unit 5A determines the current value to be supplied by the conversion circuit 7 in order to bring the first voltage V1 closer to or match the output target voltage V0. is set by the first calculation. For example, the first computing unit 5A computes the difference between the first voltage V1 and the output target voltage V0 and the integral value of the difference in the most recent constant period in accordance with a function for making the target current I0 Calculate
- timing of T0 is the timing of starting an operation for executing control to set the first voltage V1 to an appropriate value.
- the control circuit 5 repeats the operation for controlling the first voltage V1 to an appropriate value at a predetermined cycle.
- the second calculation is performed in the second calculation unit 5B of the control circuit 5.
- the target current I0 set in the first calculation is used to calculate a first duty ratio for bringing the first current I1 detected by the conversion circuit 7 closer to or matching the target current I0.
- the second calculation unit 5B calculates the difference between the first current I1 and the target current I0, and the integral value of the difference in the most recent constant period, according to a function that brings the first duty ratio Calculate
- the first current I1 used to calculate the first duty ratio may be the value detected at the timing of T0, or may be the value of T1 at which the second calculation is performed after the first calculation. It may be a value detected at timing.
- the first current I1 may be detected at any point in the conversion circuit 7. FIG. In other words, it does not matter where the first current I1 is detected.
- the third calculation section 5C of the control circuit 5 performs the third calculation. be done.
- the second time ratio is calculated based on the ratio between the output target voltage V0 detected at timing T0 and the second voltage V2 at the input terminal 2.
- the second duty ratio may be a value obtained by dividing the output target voltage V0 by the second voltage V2.
- the third calculator 5C calculates a value (V0/V2) obtained by dividing the output target voltage V0 by the second voltage V2 as the second time ratio.
- the fourth calculation section 5D of the control circuit 5 executes the fourth calculation.
- the drive duty ratio of the PWM signal is calculated by using the first duty ratio calculated in the second calculation and the second duty ratio calculated in the third calculation.
- a PWM signal having a driving time ratio is transmitted from the control circuit 5 as the control signal S2 and used to control and drive the switching element 6.
- the second time ratio is calculated based on the ratio between the output target voltage V0 and the second voltage V2 at the input terminal 2 in the third calculation.
- the first voltage V1 can be output as a value that quickly follows the variation of the second voltage V2.
- the drive duty ratio calculated in the fourth calculation may be calculated as the sum of the first duty ratio and the second duty ratio.
- the first duty ratio is determined by feedback control in order to adjust the target current I0 output by the conversion circuit 7 corresponding to the first voltage V1 corresponding to the output voltage.
- the second duty ratio is determined by feedforward control in order to adjust the first voltage V1 corresponding to the second voltage V2 corresponding to the input voltage.
- the second duty ratio used for feedforward control may contain many error components
- the first duty ratio used for feedback control is applied to the correction calculation.
- the drive duty ratio is obtained by summing the first duty ratio and the second duty ratio.
- the drive duty ratio can be obtained by simple calculations, and the control is highly versatile and can be easily executed.
- the second time ratio may be calculated based on the ratio between the output constant voltage VX and the second voltage V2.
- the second duty ratio obtained by the third computing section 5C depends not on the value of the second voltage V2 at the input terminal 2 but on the output constant voltage VX.
- the first voltage V1 can be output as a stable value.
- the drive time ratio may be calculated by multiplying the first time ratio and the second time ratio.
- the first duty ratio is determined by feedback control in order to adjust the target current I0 that flows through the conversion circuit 7 corresponding to the first voltage V1 corresponding to the output voltage.
- the second duty ratio is determined by feedforward control in order to adjust the first voltage V1 corresponding to the second voltage V2 corresponding to the input voltage.
- the first duty ratio used for feedback control is applied to the correction calculation.
- the drive duty ratio is obtained as a value corrected by multiplying the first duty ratio and the second duty ratio.
- the DCDC converter 4 is stepped down while the second voltage V2 corresponding to the input voltage is higher than the first voltage V1 corresponding to the output voltage, and the gain of the feedback control is inversely proportional to the second voltage V2. It is preferable that the first duty ratio is determined after being set to a value that
- the DCDC converter 4 when the DCDC converter 4 performs the step-down operation, fluctuations in the first voltage V1 can be suppressed regardless of fluctuations in the second voltage V2, making it easier to adjust the gain in the driving ratio.
- the drive duty ratio can be obtained by simple calculations, and the control is highly versatile and can be easily executed.
- feedforward control in addition to feedback control without repeating control, the value of the output voltage can be brought close to the output target voltage in a short time. As a result, the output voltage can be maintained at a stable value.
- the current value of the output voltage with respect to the value of the output target voltage is used to perform feedback control by the first and second calculations for controlling the current value, and the value of the output target voltage.
- Both the feedforward control by the third calculation is executed using the value of the input voltage at the present time for , and the output voltage is controlled.
- the first duty ratio PWM signal based on feedback control using the current output voltage value for the output target voltage value and the current input voltage for the output target voltage value
- the output voltage is controlled using both the second duty ratio PWM signal based on feedforward control using the value of .
- the output voltage value can be brought closer to the output target voltage in a short time by feedforward control without repeating feedback control. As a result of this, the output voltage can be maintained at a stable value.
- the drive circuit 18 turns on and off the switching element 6 and turns off the switching element 6A in accordance with the driving ratio output from the fourth computing section 5D. Outputs a control signal to turn it off and on. Since the control signal for the switching element 6A is an inverted signal of the control signal for the switching element 6, it is preferable to obtain the control signal for the switching element 6 by inverting the control signal for the switching element 6 by the inverter 18A. In other words, as the control signal for the switching element 6, it is preferable to apply the PWM signal of the driving time ratio generated from the fourth calculation section 5D. Then, the control signal for the switching element 6A is preferably applied by inverting the PWM signal of the drive time ratio emitted from the fourth calculation section 5D.
- the plurality of conversion circuits 7A, 7B, 7C, and 7D have their input terminals connected to each other and their output terminals connected to each other.
- the conversion circuit 7 configured with four phases of conversion circuits 7A, 7B, 7C, and 7D is used as an example, but the conversion circuit 7 configured by connecting a plurality of N phases (N is an integer) in parallel. It may be circuit 7 .
- control circuit 5 individually calculates the driving time ratio for each of the conversion circuits 7A, 7B, 7C, and 7D. At this time, the first operation is performed in the same manner as described above.
- the value of I0/4 obtained by dividing the target current I0 set in the first calculation for the conversion circuits 7A, 7B, 7C, and 7D, which are the individual conversion circuits 7, by the number of phases is used to obtain the first
- a first duty ratio is calculated for the individual phases to approximate or match the currents I1A, I1B, I1C, I1D to I0/4.
- the operation described above is similarly executed to calculate the second duty ratio.
- the driving duty ratio of the PWM signal for each phase is calculated by using the first duty ratio calculated in the second calculation and the second duty ratio calculated in the third calculation.
- FIG. 6A is a block diagram ((a) in FIG. 6A) showing an example of the output range of each operation in the control circuit 5 of the power conversion device 1 according to the embodiment, and a waveform example of the output voltage of the power conversion device 1 ( It is a figure which shows (b)) of FIG. 6A.
- the block diagram shown in (a) of FIG. 6A shows an example of the output ranges of the second arithmetic unit 5B, the third arithmetic unit 5C, and the fourth arithmetic unit 5D in FIG.
- the second calculation unit 5B calculates a provisional time ratio by performing a predetermined calculation using the target current I0 output from the first calculation unit 5A and the first current I1 flowing through the conversion circuit 7, and calculates the calculated provisional time. If the ratio is smaller than the predetermined minimum value -0.5, -0.5 is output as the first time ratio, and if the provisional time ratio is -0.5 or more and 0.5 or less, the provisional time ratio is output. The time ratio is output as it is as the first time ratio, and if the provisional time ratio exceeds the predetermined maximum value of 0.5, 0.5 is output as the first time ratio. That is, the second calculation section 5B outputs the first duty ratio clamped within the output range of -0.5 to 0.5.
- the predetermined calculation is, for example, a function for bringing the difference between the first current I1 and the target current I0 and the integral value of the difference in the most recent constant period closer to zero. It is a function capable of outputting a value within a representable range (for example, a floating point represented by an exponent of 127 to -126 and a mantissa of 1023 to -1022).
- the third computing unit 5C divides a predetermined voltage (target output voltage V0 in this embodiment) by a second voltage V2 to clamp the output range of 0.0 to 1.0. Outputs the 2:00 ratio.
- the fourth calculation unit 5D adds the first time ratio output by the second calculation unit 5B and the second time ratio output by the third calculation unit 5C, and calculates the output range of 0.1 to 0.9. Outputs the driving ratio clamped to .
- FIG. 6A shows a waveform example of the output voltage of the power converter 1 when each calculation outputs in the output range shown in (a) of FIG. 6A.
- the horizontal axis is time and the vertical axis is output voltage.
- the waveform of the output voltage is shown when the input voltage (that is, the second voltage V2) is 48V in pulse form (“P1: 48V” in the figure).
- FIG. 6B is a block diagram ((a) in FIG. 6B) showing another example of the output range of each operation in the control circuit 5 of the power converter 1 according to the embodiment, and the waveform of the output voltage of the power converter 1 It is a figure which shows an example ((b) of FIG. 6B).
- the output range of the second calculation unit 5B is -0.3 to 0.3, which is narrower than the case shown in FIG. 6A.
- FIG. 7 shows an operation example of FIG. 6A (the output range of the second calculation unit 5B is ⁇ 0.5 to 0.5) and an operation example of FIG. 6B (the output range of the second calculation unit 5B is ⁇ 0.3 to 0 3) is a diagram showing theoretical values and actual measurement examples of the input voltage and the maximum output voltage in 3).
- the horizontal axis is the input voltage (that is, the second voltage V2), and the vertical axis is the maximum output voltage. Note that the output target voltage V0 is 15.68V.
- a curve 7b is a curve showing the theoretical value of the maximum output voltage when the second calculation unit 5B outputs the maximum value of 0.5.
- a curve 7c is a curve showing the measured value of the maximum output voltage when the second calculation section 5B outputs the maximum value of 0.5.
- a curve 7d is a curve showing the theoretical value of the maximum output voltage when the second calculation unit 5B outputs the maximum value of 0.3.
- a curve 7e is a curve showing the measured value of the maximum output voltage when the second calculation section 5B outputs the maximum value of 0.3.
- a curve 7f is a curve showing the theoretical value of the maximum output voltage in rated operation (that is, a state in which the input voltage is stable and the output voltage is the output target voltage V0 (15.68 V)).
- the measured value of the maximum output voltage is the theoretical Well worth the value.
- the fact that the measured value of the maximum output voltage is smaller than the theoretical value of the maximum output voltage is considered to be mainly due to the influence of dead time in the control and calculation in the control circuit 5.
- the input voltage is 54 V
- the maximum output voltage of the second calculation section 5B is about 43 V when the maximum value of the output of the second calculation section 5B is 0.5 (curves 7b and 7c).
- the maximum output voltage is suppressed to about 32V.
- the first voltage V1 does not rise to a level that poses a problem even in an abnormal state. Gone.
- the power conversion device 1 is connected to the input terminal 2, the output terminal 3, the input terminal 2 and the output terminal 3, has the switching element 6 and the like, and has a DC power conversion and a first voltage at the output terminal 3, a first current flowing through the conversion circuit 7, and a second voltage at the input terminal 2 are detected, and the output target voltage and the predetermined voltage are detected.
- control circuit 5 for generating a PWM signal for driving the switching element 6 or the like by acquiring the information indicating the a first calculation for calculating a target current for the current, a second calculation for calculating a first duty ratio for bringing the first current closer to the target current, and a second duty ratio for calculating a predetermined voltage and a second voltage and a fourth calculation of calculating the drive ratio of the PWM signal by using the first duty ratio and the second duty ratio, and transmitting the PWM signal having the drive ratio. 1 voltage control.
- the value of the output voltage is adjusted to the output target voltage in a short time by the feedforward control by the third calculation. Since control is performed to bring them closer together, the output voltage can be stabilized even if the input voltage fluctuates greatly.
- the control circuit 5 may calculate the drive duty ratio as the sum of the first duty ratio and the second duty ratio, or calculate the drive duty ratio as the sum of the first duty ratio and the second duty ratio. It may be calculated by multiplying it with the time ratio. As a result, the output voltage is stabilized using both feedback control by the first and second computations and feedforward control by the third computation.
- the DCDC converter 4 has a plurality of conversion circuits from first to Nth (N is an integer) connected in parallel (in FIG. 5, the first to fourth (7A to 7D) cases are ), the control circuit 5 calculates the driving time ratio individually for each of the plurality of conversion circuits 7A to 7D, and supplies the PWM signal having the individually calculated driving time ratio to the corresponding conversion circuit 7A to 7D.
- the first voltage may be controlled by transmitting.
- control circuit 5 when the control circuit 5 receives a start signal from the outside of the power conversion device 1, the control circuit 5 executes a first calculation, a second calculation, a third calculation, and a fourth calculation, and has a driving time ratio.
- the first voltage may be controlled by sending a PWM signal. This realizes a power conversion device that starts operating in conjunction with an external activation signal such as an ignition switch of a vehicle.
- the predetermined voltage may be the output target voltage.
- the control circuit 5 calculates a provisional time ratio by performing a predetermined calculation from the first current and the target current, and when the calculated provisional time ratio exceeds a predetermined maximum value, the predetermined maximum value is calculated. It may be calculated as the first time ratio. This makes it possible to keep the maximum output voltage within a desired value even when the input voltage fluctuates greatly.
- the control circuit 5 performs a first calculation for calculating a target current for bringing the first voltage closer to the output target voltage (first calculation unit 5A), the step of the control circuit 5 executing a second calculation for calculating the first duty ratio for bringing the first current closer to the target current (processing in the second calculation unit 5B), and the control circuit 5 performs a third calculation (processing in the third calculation unit 5C) for calculating the second duty ratio based on the predetermined voltage and the second voltage; A step of executing a fourth calculation (processing in the fourth calculation unit 5D) for calculating the driving time ratio of the PWM signal by using the 2:00 ratio and the control circuit 5 transmitting the PWM signal having the driving time ratio. and a step of controlling the first voltage by doing so (processing in the drive circuit 18).
- the value of the output voltage is adjusted to the output target voltage in a short time by the feedforward control by the third calculation. Since control is performed to bring them closer together, the output voltage can be stabilized even if the input voltage fluctuates greatly.
- the third computing unit 5C uses the target output voltage as the predetermined voltage
- the fourth computing unit 5D uses the first time ratio and the second time ratio.
- the third calculation unit 5C may use the output constant voltage VX independent of the target output voltage as the predetermined voltage. can be calculated. Regardless of the premise, clamping the output range of the second calculation unit 5B to a narrower range can suppress the maximum output voltage when the input voltage fluctuates.
- vehicle control unit 12 and the control circuit 5 are described as different elements for convenience, they may be arranged in the vehicle body 9 as the same element.
- the operation of stepping down the voltage in the power converter 1 is used for explanation, but the power converter 1 according to the present disclosure is not limited to the step-down operation.
- the conversion circuit 7 may be configured to switch the voltage level relationship between the first battery 10 and the second battery 11 and perform the boosting operation.
- control circuit 5 acquires the information indicating the output target voltage V0 and the predetermined voltage from the memory that internally retains it, but it may acquire it from the outside.
- the present disclosure may also aim to provide a non-temporary recording medium, such as a computer-readable DVD, on which a program for executing a control method for a power converter and the program is recorded.
- a non-temporary recording medium such as a computer-readable DVD
- the power conversion device of the present disclosure has the effect that the output voltage is maintained at a stable value, and is useful as a DCDC converter in various electric devices.
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Abstract
Description
図1は実施の形態における電力変換装置1の構成を示す第1回路ブロック図である。
2 入力端子
3 出力端子
4 DCDCコンバータ
5 制御回路
5A 第1演算部
5B 第2演算部
5C 第3演算部
5D 第4演算部
6 スイッチング素子
6A スイッチング素子
7 変換回路
7A、7B、7C、7D 変換回路
8 車両
9 車体
10 第1バッテリー
11 第2バッテリー
12 車両制御部
13 リアクトル
Claims (8)
- 入力端子と、
出力端子と、
前記入力端子と前記出力端子とに接続され、スイッチング素子を有し、直流電力変換を行う変換回路が設けられたDCDCコンバータと、
前記出力端子における第1電圧と前記変換回路を流れる第1電流と前記入力端子における第2電圧とを検出し、出力目標電圧および所定電圧を示す情報を取得し、複数の演算を実行することで、前記スイッチング素子を駆動させるためのPWM信号を発信する制御回路とを備え、
前記制御回路は、
前記出力目標電圧に前記第1電圧を近づけるための目標電流を算出する第1演算と、
前記第1電流を前記目標電流に近づけるための第1時比率を算出する第2演算と、
前記所定電圧と前記第2電圧とに基づいて第2時比率を算出する第3演算と、
前記第1時比率と前記第2時比率とを用いることによって前記PWM信号の駆動時比率を算出する第4演算とを実行し、
前記駆動時比率をもつ前記PWM信号を発信することで前記第1電圧を制御する、
電力変換装置。 - 前記制御回路は、前記第4演算において、前記駆動時比率を、前記第1時比率と前記第2時比率との和によって算出する、
請求項1に記載の電力変換装置。 - 前記制御回路は、前記第4演算において、前記駆動時比率を、前記第1時比率と前記第2時比率との積によって算出する、
請求項1に記載の電力変換装置。 - 前記DCDCコンバータは、並列に接続された第1から第N(Nは整数)までの複数の前記変換回路を有し、
前記制御回路は、
複数の前記変換回路のそれぞれに対して個別に前記駆動時比率を算出し、
個別に算出した前記駆動時比率をもつ前記PWM信号を対応する前記変換回路に発信することで前記第1電圧を制御する、
請求項1~3のいずれか1項に記載の電力変換装置。 - 前記制御回路は、前記電力変換装置の外部から起動信号を受信した時点で、前記第1演算と、前記第2演算と、前記第3演算と、前記第4演算とを実行し、前記駆動時比率をもつ前記PWM信号を発信することで前記第1電圧を制御する、
請求項1~4のいずれか1項に記載の電力変換装置。 - 前記所定電圧は、前記出力目標電圧である、
請求項1~5のいずれか1項に記載の電力変換装置。 - 前記制御回路は、前記第2演算において、前記第1電流と前記目標電流とから所定演算を行うことで暫定時比率を算出し、算出した前記暫定時比率が所定最大値を超える場合に前記所定最大値を前記第1時比率として算出する、
請求項1~6のいずれか1項に記載の電力変換装置。 - 電力変換装置の制御方法であって、
前記電力変換装置は、
入力端子と、
出力端子と、
前記入力端子と前記出力端子とに接続され、スイッチング素子を有し、直流電力変換を行う変換回路が設けられたDCDCコンバータと、
前記出力端子における第1電圧と前記変換回路を流れる第1電流と前記入力端子における第2電圧とを検出し、出力目標電圧および所定電圧を示す情報を取得し、複数の演算を実行することで、前記スイッチング素子を駆動させるためのPWM信号を発信する制御回路とを備え、
前記制御方法は、
前記制御回路が、前記出力目標電圧に前記第1電圧を近づけるための目標電流を算出する第1演算を実行するステップと、
前記制御回路が、前記第1電流を前記目標電流に近づけるための第1時比率を算出する第2演算を実行するステップと、
前記制御回路が、前記所定電圧と前記第2電圧とに基づいて第2時比率を算出する第3演算を実行するステップと、
前記制御回路が、前記第1時比率と前記第2時比率とを用いることによって前記PWM信号の駆動時比率を算出する第4演算を実行するステップと、
前記制御回路が、前記駆動時比率をもつ前記PWM信号を発信することで前記第1電圧を制御するステップとを含む、
電力変換装置の制御方法。
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JP2007068290A (ja) * | 2005-08-30 | 2007-03-15 | Toyota Motor Corp | 電圧変換システム |
JP2008109736A (ja) | 2006-10-23 | 2008-05-08 | Murata Mfg Co Ltd | 電源システム |
JP2014057521A (ja) * | 2013-12-26 | 2014-03-27 | Mitsubishi Electric Corp | 電力変換装置 |
JP2018007291A (ja) * | 2016-06-27 | 2018-01-11 | 三菱電機株式会社 | 直流電源装置 |
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JP2007068290A (ja) * | 2005-08-30 | 2007-03-15 | Toyota Motor Corp | 電圧変換システム |
JP2008109736A (ja) | 2006-10-23 | 2008-05-08 | Murata Mfg Co Ltd | 電源システム |
JP2014057521A (ja) * | 2013-12-26 | 2014-03-27 | Mitsubishi Electric Corp | 電力変換装置 |
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