WO2022230005A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
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- WO2022230005A1 WO2022230005A1 PCT/JP2021/016582 JP2021016582W WO2022230005A1 WO 2022230005 A1 WO2022230005 A1 WO 2022230005A1 JP 2021016582 W JP2021016582 W JP 2021016582W WO 2022230005 A1 WO2022230005 A1 WO 2022230005A1
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- phase difference
- bridge circuit
- semiconductor switching
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- current
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/38—Means for preventing simultaneous conduction of switches
-
- 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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" 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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
Definitions
- This application relates to a power converter.
- This power conversion device is an isolated DC/DC converter, and is particularly intended for a DC/DC converter that bi-directionally transmits power between two DC terminals.
- a bi-directional isolated DC/DC converter in which two full-bridge circuits with multiple semiconductor switching elements are connected to the primary and secondary sides of an isolation transformer. Wide voltage with a simple circuit configuration.
- There is a demand for highly reliable output control in which power can be transmitted within a range and controllability does not deteriorate in the boost operation region due to the short-circuit prevention period.
- the duty ratio is calculated based on the transmission power and the command value to drive and control each semiconductor switching element, and one semiconductor switching element in one bridge circuit is set as the first reference element.
- the amount of phase shift of the drive signal between the semiconductor switching element of the first diagonal element in the diagonal relationship is defined as the first phase shift amount
- one semiconductor switching element in the other bridge circuit is defined as the second reference element.
- the amount of phase shift between the drive signal for the semiconductor switching element of the second diagonal element diagonally related to the second reference element and the drive signal for the first reference element is defined as the second phase shift amount, and the step-up operation is performed.
- the DC/DC converter proposed in Patent Document 1 performs power transmission in a state where the relationship between the DC voltage at one DC terminal and the DC voltage at the other DC terminal is different from the turns ratio of the transformer. It is assumed that it will be applied to the system. However, no step-up operation or step-down operation is assumed, and there is no mention of power transmission when the relationship between the DC voltage of one DC terminal and the DC voltage of the other DC terminal is equal to the turns ratio of the transformer. .
- the transmission power is small, the first phase shift amount and the second phase shift amount are decreased to match the transmission power and the command value, but the lower limit of the phase shift amount is limited to the short-circuit prevention period in each bridge circuit. Therefore, there is a limit to reducing the first phase shift amount and the second phase shift amount, and as a result, large power different from the command value may be transmitted. In such a case, an uncontrollable operating region occurs in the DC/DC converter, which causes deterioration of control performance.
- An object of the present invention is to provide a power converter in which the amount of phase shift for controlling transmission power is not affected by the short-circuit prevention period.
- a power converter disclosed in the present application includes a transformer, a first bridge circuit having a first semiconductor switching element and connected to a primary winding of the transformer and having a short-circuit prevention period set, a second semiconductor a second bridge circuit having a switching element and connected to the secondary winding of the transformer and having a short-circuit prevention period set; a first voltage detection means for detecting a voltage input to the first bridge circuit; a second voltage detection means for detecting a voltage input to the second bridge circuit; and a control device for controlling the first semiconductor switching element and the second semiconductor switching element, wherein the control device Based on the first voltage value detected by the first voltage detecting means, the second voltage value detected by the second voltage detecting means, and the power command value, the output of the first bridge circuit and the second A phase difference calculator for calculating a phase difference with the output of the bridge circuit, and an error caused in the phase difference is compensated by the calculation result of the phase difference calculator, the first voltage value, and the second voltage value.
- a compensation amount calculation unit for calculating a compensation amount
- a PWM signal generator for generating
- power can be transmitted according to the power command value without being affected by the short-circuit prevention period.
- FIG. 1 is a configuration diagram of a power conversion device according to Embodiment 1;
- FIG. 4 is a waveform diagram showing voltage and alternating current applied to the transformer windings of the first embodiment;
- FIG. 4 is an explanatory diagram of the charging operation of the power conversion device of Embodiment 1;
- FIG. 4 is an explanatory diagram of the charging operation of the power conversion device of Embodiment 1;
- 4 is a waveform diagram showing voltage and alternating current applied to the transformer windings of the first embodiment;
- FIG. FIG. 4 is a diagram for explaining the charging operation of the power conversion device of Embodiment 1;
- 2 is a characteristic diagram of the power conversion device of Embodiment 1.
- FIG. 7 is a waveform diagram showing voltage and alternating current applied to the transformer windings of the second embodiment;
- FIG. 10 is a diagram for explaining the charging operation of the power conversion device of Embodiment 2;
- FIG. 10 is a characteristic diagram of the power conversion device of Embodiment 2;
- FIG. 10 is a waveform diagram showing voltage and alternating current applied to the transformer windings of the third embodiment;
- FIG. 11 is a characteristic diagram of the power conversion device of Embodiment 3;
- FIG. 13 is a diagram showing the configuration of a control device according to Embodiment 4;
- FIG. 14 is a flowchart for explaining the operation of the control device of Embodiment 4;
- FIG. 11 is a configuration diagram of a power conversion device according to Embodiment 5;
- FIG. 12 is a configuration diagram of a control device in Embodiment 5; It is a hardware block diagram of a control apparatus.
- Embodiment 1 In the first embodiment, a DC/DC converter having two bridge circuits and a transformer with two windings, which transmits power from one DC terminal to the other DC terminal, is described. explain.
- FIG. 1 is a circuit diagram showing the configuration of a power converter according to Embodiment 1 of the present application.
- the power conversion device 1 includes a first bridge circuit 12 connected to a first DC terminal 11 that receives DC power from a DC power supply 10, and a second DC terminal 21 of a second DC terminal 21. It has a connected second bridge circuit 22 and a transformer 30 .
- the first bridge circuit 12 includes a DC capacitor Cdc1 connected in parallel to a first DC terminal 11, and two switching legs formed by connecting in series semiconductor switching elements Q11 to Q14 as semiconductor elements on the positive electrode side and the negative electrode side, respectively.
- the second bridge circuit 22 includes a DC capacitor Cdc2 connected in parallel to the second DC terminal 21, and two switching legs formed by connecting in series semiconductor switching elements Q21 to Q24 as semiconductor elements on the positive electrode side and the negative electrode side, respectively.
- the intermediate connection point of each switching leg in the first bridge circuit 12 and the primary winding 31 of the transformer 30 are connected, and the intermediate connection point of each switching leg in the second bridge circuit 22 and the secondary winding 32 of the transformer 30 are connected. is connected.
- the power converter 1 is a circuit that converts the voltage V1 of the first DC terminal 11 into the voltage V2 applied to the second DC terminal 21 via the first bridge circuit 12, the transformer 30 and the second bridge circuit 22. , bi-directional power conversion is freely controllable.
- a voltage V ⁇ b>1 at the first DC terminal 11 is detected by the first voltage detection means 33 .
- the voltage V2 of the second DC terminal 21 is detected by the second voltage detection means 34 .
- the direct-current power supply is connected to a solar panel (PV) or a storage battery whose output voltage fluctuates.
- PV solar panel
- the load 20 is connected to a storage battery whose voltage fluctuates.
- an AC load such as a motor connected via a DC/AC converter, an LED connected via a DC/DC converter, or the like is assumed.
- a semiconductor switching element having a self-extinguishing function such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) in which a diode is connected in anti-parallel is used.
- IGBT Insulated Gate Bipolar Transistor
- MOSFET Metal Oxide Semiconductor Field Effect Transistor
- Each semiconductor switching element Q11 to Q24 may be used by combining a plurality of semiconductor switching elements in parallel according to the current capacity.
- the control device 40 generates gate signals 41 and 42 to the semiconductor switching elements Q11 to Q24 of the first bridge circuit 12 on the power supply side and the second bridge circuit 22 on the load side to switch the semiconductor switching elements Q11 to Q24. to control.
- the first bridge circuit 12 outputs an AC voltage VT1 to the primary winding 31 of the transformer 30, and the second bridge circuit 22 outputs an AC voltage VT1 to the secondary winding of the transformer 30. Outputs AC voltage VT2 on line 32 .
- each of the semiconductor switching elements Q11 to Q24 can perform zero voltage switching (ZVS) operation, which is soft switching. becomes.
- ZVS zero voltage switching
- each of the semiconductor switching elements Q11 to Q24 performs soft switching, so that the switching loss can be reduced, the operating frequency can be increased, and the size of the transformer 30 can be reduced.
- soft switching is a technique for reducing the voltage or current applied to the semiconductor switching elements Q11 to Q24 during switching transient periods, thereby reducing switching loss and electromagnetic noise.
- the inductance element may utilize the leakage inductance of the transformer 30 .
- Electrolytic capacitors, film capacitors, or the like are used for the DC capacitors Cdc1 and Cdc2.
- a high-frequency current flows through the DC capacitors Cdc1 and Cdc2, but when film capacitors are used, deterioration due to the high-frequency current can be suppressed and the life of the capacitors can be extended.
- the direction of the arrow is assumed to be positive.
- the control device 40 according to Embodiment 1 includes a phase difference calculator 401 , a compensation amount calculator 402 and a PWM signal generator 403 .
- the phase difference calculator 401 calculates the AC voltage output by the first bridge circuit 12 to the primary winding 31 of the transformer 30 based on the DC voltage V1 detected by the first voltage detector 33 and the power command value Pref. A phase difference ⁇ cal between VT1 and the AC voltage VT2 that the second bridge circuit 22 outputs to the secondary winding 32 of the transformer 30 is calculated.
- Compensation amount calculation unit 402 is necessary to compensate for an error caused by a phase difference between AC voltages VT1 and VT2 applied to primary winding 31 and secondary winding 32 of transformer 30 during the short-circuit prevention period. Calculate the amount of compensation.
- the DC voltage V1 detected by the first voltage detection means 33 and the DC voltage V2 detected by the second voltage detection means 34 and the phase difference ⁇ cal calculated by the phase difference calculation section 401 are used. Compensation amount ⁇ comp is calculated from .
- the compensation amount calculation unit 402 combines the DC voltage V1 detected by the first voltage detection unit 33 and the DC voltage V2 detected by the second voltage detection unit 34 with the phase difference calculation unit 401. From the phase difference, the current immediately before the semiconductor switching elements Q11 to Q24 in each of the first bridge circuit 12 and the second bridge circuit 22 turn on is calculated. It is determined whether the ZVS operation has been achieved.
- the compensation amount calculation unit 402 calculates the phase amount corresponding to the short-circuit prevention period as a phase difference.
- the phase difference calculated by the unit 401 is output with the opposite polarity.
- the phase amount corresponding to the short-circuit prevention period is calculated by the phase difference calculation unit 401. Output with the same polarity with respect to the phase difference.
- the PWM signal generation unit 403 sets the phase difference obtained by adding the phase difference ⁇ cal calculated by the phase difference calculation unit 401 and the compensation amount ⁇ comp calculated by the compensation amount calculation unit 402 as a phase difference command value ⁇ ref. , gate signals 41 and 42 for the semiconductor switching elements Q11 to Q24 are generated.
- the gate signals of the semiconductor switching elements Q11 to Q24 in the first embodiment are indicated by a1 and a2.
- the waveforms of the AC voltages VT1 and VT2 output to the line 32 are shown at b1 and b2, and the waveform of the AC current IL is shown at c.
- ⁇ td is the short-circuit prevention period
- ⁇ ref is the phase difference command value generated within the control device 40
- ⁇ is the phase difference between the actual AC voltages VT1 and VT2.
- each of the semiconductor switching elements Q11 to Q24 is increased (for example, 61 Hz or more) in order to downsize the transformer 30, the loss of the transformer 30 increases.
- a silicon steel sheet with a silicon content of 6.5% or a silicon steel sheet with a thickness of about 0.1 mm as the iron core material it is possible to suppress an increase in loss due to high frequency.
- phase difference ⁇ between the AC voltage VT1 output by the first bridge circuit 12 and the AC voltage VT2 output by the second bridge circuit 22 .
- the power to be transmitted is controlled by controlling the phase difference ⁇ , and power is transmitted from the side with the advanced phase difference to the side with the delayed phase difference.
- the phase of the AC voltage VT1 leads the AC voltage Vt2
- power is transmitted from the first bridge circuit 12 on the power supply side to the second bridge circuit 22 on the load side.
- the power P transmitted from the DC power supply 10 to the load 20 can be obtained by the following formula (1).
- fSW is the switching frequency of the semiconductor switching elements Q11 to Q24
- L is the current through which the AC current passes, including the leakage inductance between the primary winding 31 and the secondary winding 32. It is the total value of all inductance elements included in the path. In general, in this inductance element, wiring inductance and parasitic inductance included in semiconductor switching elements are ignored. It mainly refers to an inductance connected in series with the transformer 30 . Also, V2 is a voltage value converted into a value seen from the primary winding 31 of the transformer 30 .
- the alternating currents IL0, IL1, and IL2 at each change point are expressed by the following equation (2): , (3) and (4).
- phase difference ⁇ for controlling the electric power can be obtained by the following equation (6) by modifying the equation (1) in the phase difference calculation unit 401 in the control device 40 .
- phase difference ⁇ can be approximately obtained from the equation (1) as shown in the following equation (7).
- the control device 40 can be configured at a lower cost.
- the verification result ⁇ cal of the phase difference calculation unit 401 is input to the PWM signal generation unit 403 as the phase difference command value ⁇ ref, and the gate signals 41 and 42 are generated as PWM Each is generated by the signal generator 403 .
- FIG. 3 shows the states of the semiconductor switching elements Q11 to Q24 and the alternating current IL immediately before the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 are turned on.
- the semiconductor switching elements Q11, Q12, Q13, Q14, Q21, and Q24 indicated by dashed lines indicate that they are in an OFF state or are not conducting current, and the semiconductor switching elements indicated by solid lines.
- Q22 and Q23 indicate that they are on or current-conducting elements.
- FIG. 3 shows the state immediately before the semiconductor switching elements Q11 and Q14 are turned on, in the first bridge circuit 12, all the semiconductor switching elements Q11 to Q14 are turned off during the short-circuit prevention period. is.
- the diodes connected in antiparallel to the semiconductor switching elements Q11 and Q14 are conducting during the short-circuit prevention period.
- the applied voltage is zero.
- the semiconductor switching elements Q11 and Q14 are turned on, the ZVS operation is performed.
- the current immediately before each of the semiconductor switching elements Q11 to Q14 turns on must be a negative value. It is a condition that In the first bridge circuit 12, the semiconductor switching elements Q12 and Q13 are turned off immediately before the short-circuit prevention period starts, and the diodes connected in anti-parallel to the semiconductor switching elements Q11 and Q14 become conductive when the short-circuit prevention period starts. The polarity of the AC voltage VT1 at the first AC terminal 13 is switched from negative to positive.
- FIG. 4 shows the states of the semiconductor switching elements Q11 to Q24 and the alternating current IL immediately before the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 are turned on.
- the semiconductor switching elements Q12, Q13, Q21, Q22, Q23, and Q24 indicated by dashed lines indicate that they are in an OFF state or are not conducting current, and the semiconductor switching elements indicated by solid lines.
- Q11 and Q14 indicate that they are on or conducting current. Since FIG. 4 shows the state immediately before the semiconductor switching elements Q21 and Q24 turn on, in the second bridge circuit 22, during the short-circuit prevention period in which all the semiconductor switching elements Q21 to Q24 are in the off state, is.
- the diodes connected in anti-parallel to the semiconductor switching elements Q21 and Q24 are conducting during the short-circuit prevention period.
- the applied voltage is zero.
- the semiconductor switching elements Q21 and Q24 are turned on, the ZVS operation is performed.
- the current immediately before each of the semiconductor switching elements Q21 to Q24 turns off must be a positive value. It is a condition that there is In the second bridge circuit 22, the semiconductor switching elements Q22 and Q23 are turned off immediately before the short-circuit prevention period starts, and the diodes connected in anti-parallel to the semiconductor switching elements Q21 and Q24 become conductive when the short-circuit prevention period starts. Since the voltage VT2 of the second AC terminal 23 is in the state of being in a state where the polarity is changed from negative to positive.
- the gate signals of the semiconductor switching elements Q11 to Q24 when the voltage V1 of the first DC terminal 11 is higher than the voltage V2 of the second DC terminal 21 are indicated by a1 and a2.
- Waveforms of the AC voltages VT1 and VT2 output from the first bridge circuit 12 and the second bridge circuit 22 to the primary winding 31 and the secondary winding 32 of the transformer 30 are indicated by b1 and b2, and the waveform of the AC current IL is is shown in c.
- the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 since the alternating current IL0 at the instant when the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 turn on is a negative value, the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 is turned on is the same as in FIG. 3, the first bridge circuit 12 achieves ZVS operation.
- the alternating current IL1 at the moment when the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 turn on is a negative value, and the state immediately before the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 turn on is , is different from FIG.
- FIG. 6 shows the semiconductor switching element Q11 immediately before the semiconductor switching elements Q21 and Q24 of the second bridge circuit 22 turn on when the voltage V1 of the first DC terminal 11 is higher than the voltage V2 of the second DC terminal 21. ⁇ Q24 state and alternating current IL.
- semiconductor switching elements indicated by dashed lines are in an off state or elements not conducting current
- semiconductor switching elements indicated by solid lines are in an on state or elements conducting current. It shows that
- the alternating current IL is a negative value
- the alternating current passes through the diodes connected in anti-parallel to the semiconductor switching elements Q22 and Q23. ing.
- the polarity of the AC voltage VT2 remains negative, and when the short-circuit prevention period ends, the semiconductor switching elements Q21 and Q24 are turned on, so the polarity of the AC voltage VT2 switches to positive.
- the semiconductor switching elements Q21 and Q24 are turned on while the diodes connected in antiparallel to the semiconductor switching elements Q22 and Q23 are conducting. recovery occurs. Furthermore, since the polarity of the voltage is not switched until the short-circuit prevention period ends, the phase difference ⁇ between the AC voltages VT1 and VT2 is equal to the phase difference ⁇ cal calculated by the phase difference calculator 401, and the short-circuit prevention period ⁇ td An error will occur in the transmitted power.
- the compensation amount calculation unit 402 calculates the compensation phase difference ⁇ comp that compensates for the error ⁇ td occurring in the phase difference ⁇ , and adds it to the phase difference ⁇ cal calculated by the phase difference calculation unit 401 .
- the phase difference command value ⁇ ref to which the compensating phase difference ⁇ comp is added is calculated and input to the PWM signal generation unit to obtain the gate signals 41 and 42, thereby transmitting the power P that matches the command value to the load 20. do.
- the phase difference calculation unit 401 uses the detected voltage V1 of the first DC terminal 11 and the detected voltage V2 of the second DC terminal 21 to calculate the phase difference.
- the switching frequency fsw and the inductance element L are used in the calculation of the equation (6) or (7). is pre-filled with design values.
- the phase difference ⁇ cal which is the output of the phase difference calculation unit 401, the detected voltage V1 of the first DC terminal 11, and the detected voltage V2 of the second DC terminal 21 are expressed by the equation (2) and Substitute into the equation (5) to calculate the alternating current IL0. Furthermore, by substituting the calculated alternating current IL0 and the phase difference ⁇ cal, the detected voltage V1 of the first DC terminal 11, and the detected voltage V2 of the second DC terminal 21 into the equations (3) and (5), the alternating current A current IL1 is calculated.
- FIG. 7 shows a comparison between the presence and absence of the compensation amount ⁇ comp by the compensation amount calculation unit 402, which was performed by simulation. As shown in FIG. 7, it can be confirmed that the power output from the power converter 1 well matches the power command value due to the effect of the compensation amount ⁇ comp by the compensation amount calculation unit 402 . With such a configuration, even if the output voltage of the DC power supply 10 fluctuates and the voltage of the load 20 fluctuates, the power transmitted to the load 20 does not have an error and control is performed without complicating the power control. A highly accurate power converter 1 can be realized.
- Embodiment 1 describes the case where the voltage V1 at the first DC terminal 11 is greater than the voltage V2 at the second DC terminal 21 .
- Embodiment 2 describes a case where the voltage V1 at the first DC terminal 11 is lower than the voltage V2 at the second DC terminal 21 .
- the gate signals of the semiconductor switching elements Q11 to Q24 when the voltage V1 of the first DC terminal 11 is larger than the voltage V2 of the second DC terminal 21 are indicated by a1 and a2, and the first bridge Waveforms of AC voltages VT1 and VT2 output from circuit 12 and second bridge circuit 22 to primary winding 31 and secondary winding 32 of transformer 30 are shown at b1 and b2, and waveforms of AC current IL are shown at c. show.
- the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 since the alternating current IL1 at the instant when the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 turn on has a positive value, the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 is turned on is the same as in FIG. 4, the second bridge circuit 22 achieves ZVS operation.
- the current IL0 at the moment when the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 turn on has a positive value, and the state immediately before the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 turn on is It is different from FIG.
- FIG. 9 shows the semiconductor switching element Q11 immediately before the semiconductor switching elements Q11 and Q14 of the first bridge circuit 12 turn on when the voltage V1 of the first DC terminal 11 is lower than the voltage V2 of the second DC terminal 21. ⁇ Q24 state and alternating current IL.
- semiconductor switching elements indicated by dashed lines are in an off state or elements not conducting current
- semiconductor switching elements indicated by solid lines are in an on state or elements conducting current. It shows that
- the alternating current IL has a positive value, even immediately before the semiconductor switching elements Q11 and Q14 turn on, the current passes through the diodes connected in anti-parallel to the semiconductor switching elements Q12 and Q13.
- the polarity of the AC voltage VT1 remains negative, and when the short-circuit prevention period ends, the semiconductor switching elements Q11 and Q14 are turned on, so the polarity of the AC voltage VT1 switches to positive.
- the semiconductor switching elements Q11 and Q14 are turned on while the diodes connected in antiparallel to the semiconductor switching elements Q12 and Q13 are conducting. recovery occurs.
- the phase difference ⁇ between the AC voltages VT1 and VT2 is equal to the phase difference ⁇ cal calculated by the phase difference calculator 401, and the short-circuit prevention period ⁇ td , resulting in an error in the power to be transmitted.
- the phase difference ⁇ between the AC voltages VT1 and VT2 will include an error corresponding to the short-circuit prevention period ⁇ td.
- the compensation amount calculation unit 402 calculates the phase difference ⁇ comp that compensates for the error ⁇ td occurring in the phase difference ⁇ , and adds it to the phase difference ⁇ cal calculated by the phase difference calculation unit 401. After that, the phase difference command value ⁇ ref to which the phase difference ⁇ comp is added is calculated and input to the PWM signal generation unit to obtain the gate signals 41 and 42, thereby transmitting the power P that matches the command value to the load 20. .
- the phase difference calculation unit 401 uses the detected voltage V1 of the first DC terminal 11 and the detected voltage V2 of the second DC terminal 21 to calculate the phase difference.
- the switching frequency fsw and the inductance element L are used in the calculation of the equation (6) or (7), and these values are determined when the power conversion device 1 is designed. A design value is entered in advance.
- the phase difference ⁇ cal which is the output of the phase difference calculation unit 401, the detected voltage V1 of the first DC terminal 11, and the detected voltage V2 of the second DC terminal 21 are expressed by Equation (2). and into equation (5) to calculate the alternating current IL0.
- the phase difference command value ⁇ ref is calculated by adding the compensation phase difference ⁇ comp of the output of the compensation amount calculation unit 402 to the output ⁇ cal of the phase difference calculation unit 401.
- FIG. 10 shows a comparison between the presence and absence of the compensation amount ⁇ comp by the compensation amount calculation unit 402 performed by simulation. As shown in FIG. 11, it can be confirmed that the power output from the power converter 1 well matches the power command value due to the effect of the compensation amount ⁇ comp by the compensation amount calculation unit 402 . With such a configuration, even if the output voltage of the DC power supply 10 fluctuates and the voltage of the load 20 fluctuates, the power transmitted to the load 20 does not have an error and control is performed without complicating the power control. A highly accurate power converter 1 can be realized.
- Embodiment 3 In the second embodiment, the case where voltage V1 at first DC terminal 11 is lower than voltage V2 at second DC terminal 21 has been described. Embodiment 3 describes a case where the power that the power conversion device 1 transmits to the load 20 is small.
- the gate signals of the semiconductor switching elements to Q24 when the power transmitted from the first DC terminal 11 to the second DC terminal 21 is small are indicated by a1 and a2, and the first bridge circuit 12 and the second bridge circuit Waveforms of AC voltages VT1 and VT2 output from transformer 22 to primary winding 31 and secondary winding 32 of transformer 30 are indicated by b1 and b2, and waveform of AC current IL is indicated by c.
- the alternating current IL has a period ⁇ Z during which the polarity is switched to zero, and this period does not contribute to power transmission. It becomes smaller than ⁇ ref by the period ⁇ Z, and as a result, an error occurs in the power transmitted to the load 20 . Also, since this period occurs during the short-circuit prevention period of the first bridge circuit 12 and the AC IL is zero, the polarity of the AC voltage VT1 matches that of the AC voltage VT2.
- This period ⁇ Z occurs from the moment when the alternating current IL becomes IL0 to the moment when it becomes IL1. Therefore, if the phase at the moment when the alternating current IL becomes IL1 in the period from the moment when the alternating current IL becomes IL1 to the moment when the alternating current IL becomes IL1, the relationship of the expression (8) is obtained from the expressions (2) and (5). will be established.
- the control device 40 in the phase difference calculation unit 401, the voltage V1 of the first DC terminal 11, the voltage V2 of the second DC terminal 21, and the command value P of the power transmitted by the power conversion device 1 are expressed by the equation (6) or
- the phase difference ⁇ cal is calculated and output by substituting it into the equation (7), and the compensation amount calculation unit 402 calculates and outputs the compensation phase difference ⁇ comp according to the equation (10), and then adds it to the phase difference ⁇ cal.
- a phase difference command value ⁇ ref that does not cause an error in the power transmitted to the load 20 can be obtained.
- FIG. 12 shows a comparison between the presence and absence of the compensation amount ⁇ comp by the compensation amount calculation unit 402, which was performed by simulation. As shown in FIG. 12, when the power command value is small, it is confirmed that the power output from the power conversion device 1 well matches the power command value due to the effect of the compensation amount ⁇ comp by the compensation amount calculation unit 402. can. By adopting such a configuration, it is possible to realize the power conversion device 1 with high control accuracy without generating an error in the power transmitted to the load 20 .
- Embodiment 4 In the third embodiment, the case where the power transmitted from the power converter 1 to the load 20 is small has been described. However, in reality, the state of the load 20 is always changing, and the state of the DC power supply 10 is also always changing. Therefore, the compensation amount calculator 402 needs to output the phase difference compensation amount ⁇ comp according to the state. In the fourth embodiment, a configuration of control device 40 that calculates phase difference compensation amount ⁇ comp in compensation amount calculation section 402 in accordance with the states of load 20 and DC power supply 10 will be described.
- FIG. 13 shows the configuration of the control device 40 according to the fourth embodiment.
- the control device 40 according to the fourth embodiment differs from the control devices 40 according to the first to third embodiments by detecting the detected value of the voltage V1 at the first DC terminal 11, the detected value of the voltage V2 at the second DC terminal 21, and the phase difference. From the output of the calculation unit 401, the switching time current and zero current phase calculation unit 404 that calculates the currents IL0 and IL1 and the phase ⁇ 0, and the calculation result of this switching time current and zero current phase calculation unit 404, the first bridge circuit 12 and the second bridge circuit 22;
- the current zero period determination unit 406 receives the phase ⁇ 0, compares it with the short-circuit prevention period ⁇ td, and determines that a period ⁇ Z in which the alternating current IL becomes zero occurs if ⁇ 0 ⁇ td. If ⁇ td, it is determined that the period ⁇ Z in which the alternating current IL becomes zero does not occur. This determination result is transmitted to the compensation amount calculation unit 402 .
- the compensation amount calculation section 402 Upon receiving the determination results of the ZVS operation determination section 405 and the zero current period determination section 406, the compensation amount calculation section 402 calculates the phase difference compensation amount ⁇ comp based on the determination results. For example, when IL0>0 and IL1>0 in the ZVS operation determination unit 405, it is determined that the ZVS operation has not been achieved in the first bridge circuit 12 and the ZVS operation has been achieved in the second bridge circuit 22. The result is sent to the compensation amount calculator 402 .
- FIG. 14 shows a flowchart of the control device 40.
- the switching current and zero current phase calculation unit 404 calculates the detected value of the voltage V1 at the first DC terminal 11, the detected value of the voltage V2 at the second DC terminal 21, the power command Pref, and the switching frequency fsw.
- the currents IL0 and IL1 are calculated from the inductance L of the inductance element, and the phase difference ⁇ cal is calculated by the phase difference calculator 401 (step S1).
- the ZVS operation determination unit 405 determines whether the ZVS operation is achieved in the first bridge circuit 12 from the polarity of IL0 (step S2). At this time, when the ZVS operation is achieved in the first bridge circuit 12 (IL0 ⁇ 0) (YES), the process proceeds to step S3A, and when the ZVS operation is not achieved in the first bridge circuit 12 (IL0> 0) (NO), the process proceeds to step S3B.
- step S6 the phase difference command value ⁇ ref is calculated by adding the compensation amount ⁇ comp calculated by the compensation amount calculator 402 to the phase difference ⁇ cal.
- step S7 the phase difference command value ⁇ ref is input to the PWM signal generator 403 to generate the gate signals 41 and 42 (step S7). After that, steps S1 to S7 are repeated as long as the power conversion device 1 is in operation.
- Embodiment 5 So far, the method of calculating the alternating current IL from the operating conditions in the control device 40 and determining the presence or absence of the influence of the short-circuit prevention period has been described.
- the AC current IL is detected, and it is determined whether or not the ZVS operation is achieved in the first bridge circuit 12 and the second bridge circuit 22, thereby compensating for the influence of the short-circuit prevention period. I will explain about.
- FIG. 15 shows the power conversion device 1 having the current detection means 43 .
- the current detection means 43 is arranged in the first bridge circuit 12 in FIG. 15, it is not limited to this.
- the current detection means may be arranged in the second bridge circuit 22 or may be arranged in both the first bridge circuit 12 and the second bridge circuit 22 .
- FIG. 16 shows the configuration of the control device 40 when the power conversion device 1 is equipped with the current detection means 43 .
- the control device 40 includes a switching current detection unit 407 that detects switching currents in the first bridge circuit 12 and the second bridge circuit 22 from the alternating current IL detected by the current detection means 43 .
- the switching current detection unit 407 detects the current IL0 when the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 are turned on, and transmits this to the ZVS operation determination unit 405. Also, in the switching current detection unit 407, the current IL2 when the semiconductor switching elements Q11 and Q14 in the first bridge circuit 12 are turned off is detected, and the ZVS operation in the first bridge circuit 12 is detected by transmitting the current IL2 to the ZVS operation determination unit 405. can be determined whether is achieved. This is because the integrated value of one cycle of the AC current IL is zero, and IL2 has the same absolute value as IL0, although the polarity is opposite to that of IL0.
- the switching current detection unit 407 detects the current IL1 when the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 are turned on, and transmits this to the ZVS operation determination unit 405. Also, in the switching current detection unit 407, the current at the turn-off of the semiconductor switching elements Q21 and Q24 in the second bridge circuit 22 is detected and transmitted to the ZVS operation determination unit 405. It is possible to determine whether or not it has been achieved.
- FIG. It is composed of a processor 100 and a storage device 200.
- the storage device 200 includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory.
- a non-volatile auxiliary storage device such as a flash memory.
- an auxiliary storage device such as a hard disk may be provided instead of the flash memory.
- the processor 100 By executing the program input from the storage device 200, the processor 100 performs communication between the communication terminal 81 and the local server 5 and the local network base station 6, for example.
- the program is input from the auxiliary storage device to the processor 100 via the volatile storage device.
- the processor 100 may output data such as calculation results to the volatile storage device of the storage device 200, or may store the data in the auxiliary storage device via the volatile storage device.
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Abstract
Description
複数の半導体スイッチング素子を備えたブリッジ回路による2台のフルブリッジ回路を、絶縁トランスの一次側と二次側とに接続された双方向絶縁型DC/DCコンバータにおいて、簡易な回路構成で広い電圧範囲で電力伝送ができ、短絡防止期間に起因して昇圧動作領域にて制御性が劣化することなく、信頼性の高い出力制御が望まれている。
このような場合、DC/DCコンバータは制御不能な動作領域が発生することになるため、制御性能の悪化の原因となる。
実施の形態1
実施の形態1では、2台のブリッジ回路と2つの巻線を備えたトランスとを有するDC/DCコンバータであって、一方の直流端子からもう一方の直流端子に電力を送電する電力変換装置について説明する。
図1に示すように、電力変換装置1は、直流電源10からの直流電力を受け付ける第1直流端子11に接続された第1ブリッジ回路12と、第2直流端子21の第2直流端子21に接続された第2ブリッジ回路22と、トランス30とを備えている。
第2ブリッジ回路22は、第2直流端子21に並列に接続された直流コンデンサCdc2と、それぞれ正極側と負極側の半導体素子としての半導体スイッチング素子Q21~Q24を直列接続してなる2つのスイッチングレグとを有している。
電力変換装置1は、第1直流端子11の電圧V1を第1ブリッジ回路12、トランス30および第2ブリッジ回路22を介して、第2直流端子21に印加される電圧V2に変換する回路であり、双方向の電力変換が自由に制御可能である。
直流電源には、太陽光パネル(PV)あるいは蓄電池のように出力電圧が変動するものが接続されることが想定される。さらに、交流電力をAC/DC変換器によって直流に変換する場合も考えられる。また、負荷20は、蓄電池のように電圧が変動するものが接続されることが想定される。さらに、DC/AC変換器を介して接続されるモータ等の交流負荷あるいは、DC/DC変換器を介して接続されるLEDなどが想定される。
この場合、各半導体スイッチング素子Q11~Q24がソフトスイッチングすることで、スイッチング損失が低減可能となり、動作周波数を高め、トランス30の小型化が可能となる。
なお、図1において、矢印の向きを正としている。
図1に示すように、実施の形態1における制御装置40は、位相差演算部401、補償量演算部402、およびPWM信号生成部403を備えている。
また、V2はトランス30の一次側巻線31から見た値に換算されている電圧値である。
さらに、短絡防止期間が終了するまで、電圧の極性が切替わらないため、交流電圧VT1,VT2の間の位相差φは位相差演算部401で演算した位相差φcalに対して、短絡防止期間φtd分だけ大きくなることになるため、伝送する電力に誤差が生じることになる。
そこで、制御装置40では、補償量演算部402で位相差φに生じる誤差φtdを補償する補償位相差φcompを算出し、それを位相差演算部401で演算した位相差φcalに加算する。その後、補償位相差φcompが加算された位相差指令値φrefを演算し、PWM信号生成部に入力して、ゲート信号41,42を得ることで、指令値と一致した電力Pを負荷20に伝送する。
このような構成とすることで、電力制御を複雑化させることなく直流電源10の出力電圧が変動した場合および負荷20の電圧が変動した場合でも、負荷20に伝送する電力に誤差が
生じなくなり制御精度の高い電力変換装置1を実現することができる。
実施の形態1では、第1直流端子11の電圧V1が第2直流端子21の電圧V2に対して大きくなった場合について説明を行った。実施の形態2では、第1直流端子11の電圧V1が第2直流端子21の電圧V2に対して小さくなった場合について説明する。
つまり、第1ブリッジ回路12側でZVS動作が達成できなければ、交流電圧VT1,VT2の間の位相差φで短絡防止期間φtd分だけ誤差を含むことになる。
なお、式(6)または式(7)の演算にはスイッチング周波数fswとインダクタンス要素Lが使用されるが、この値は電力変換装置1の設計時に決定される値であり、制御装置40には設計値があらかじめ入力されている。
このような構成とすることで、電力制御を複雑化させることなく直流電源10の出力電圧が変動した場合および負荷20の電圧が変動した場合でも、負荷20に伝送する電力に誤差が生じなくなり制御精度の高い電力変換装置1を実現することができる。
この場合、影響を打ち消し合うことから、短絡防止期間φtdの影響はなくなるため、補償量演算部402の出力φcompの出力はφcomp=0となる。
実施の形態2では、第1直流端子11の電圧V1が第2直流端子21の電圧V2に対して小さくなった場合について説明した。実施の形態3では、電力変換装置1が負荷20に伝送する電力が小さい場合について説明を行う。
図11に、第1直流端子11から第2直流端子21に送電される電力が小さい場合の各半導体スイッチング素子~Q24のゲート信号をa1、a2に示し、第1ブリッジ回路12および第2ブリッジ回路22からトランス30の一次側巻線31および二次側巻線32に出力される交流電圧VT1,VT2の波形をb1、b2に示し、交流電流ILの波形をcに示す。
したがって、この場合は第1ブリッジ回路12および第2ブリッジ回路22においてZVS動作が達成されていることになり、交流電圧VT1,VT2の間の位相差には誤差が生じないことになる。
その後、第1ブリッジ回路12の短絡防止期間φtdが終了すると交流電圧VT1の極性が期間φZ開始前の極性に戻ることを踏まえると、電力の伝送に寄与しない期間φZは、次の式(10)で求めることができる。
このような構成とすることで、負荷20に伝送する電力に誤差が生じなくなり制御精度の高い電力変換装置1を実現することができる。
実施の形態3では、電力変換装置1が負荷20に伝送する電力が小さい場合について説明を行った。しかし実際には、負荷20の状態は常に変化しており、また直流電源10の状態も常に変化している。したがって、状態に合わせて補償量演算部402は位相差の補償量φcompを出力する必要がある。実施の形態4では、負荷20および直流電源10の状態に合わせて補償量演算部402にて位相差の補償量φcompを演算する制御装置40の構成について説明する。
これらの結果を受けて補償量演算部402では、補償位相差φcomp=+φtdを出力する。
制御装置40では、まず、スイッチング時電流および電流ゼロ時位相演算部404で第1直流端子11の電圧V1の検出値と第2直流端子21の電圧V2検出値と電力指令Prefとスイッチング周波数fswとインダクタンス要素のインダクタンスLから電流IL0とIL1を算出するとともに、位相差演算部401にて位相差φcalを算出する(ステップS1)。
次に、位相差指令値φrefをPWM信号生成部403に入力し、ゲート信号41,42を生成する(ステップS7)。
以降、電力変換装置1が動作している限りステップS1~S7が繰り返される。
これまでは、交流電流ILを制御装置40にて動作条件から演算し、短絡防止期間の影響の有無を判定する方法について説明をした。実施の形態5では、交流電流ILを検出し、第1ブリッジ回路12および第2ブリッジ回路22にてZVS動作が達成されているか否かを判定することで、短絡防止期間の影響を補償する構成について説明を行う。
従って、例示されていない無数の変形例が、本願明細書に開示される技術の範囲内において想定される。例えば、少なくとも1つの構成要素を変形する場合、追加する場合または省略する場合、さらには、少なくとも1つの構成要素を抽出し、他の実施の形態の構成要素と組み合わせる場合が含まれるものとする。
Claims (10)
- トランスと、第1の半導体スイッチング素子を有し前記トランスの一次側巻線に接続され短絡防止期間が設定されている第1ブリッジ回路と、第2の半導体スイッチング素子を有し前記トランスの二次側巻線に接続され短絡防止期間が設定されている第2ブリッジ回路と、前記第1ブリッジ回路に入力される電圧を検出する第1電圧検出手段と、前記第2ブリッジ回路に入力される電圧を検出する第2電圧検出手段と、前記第1の半導体スイッチング素子および前記第2の半導体スイッチング素子の制御を行なう制御装置とを備え、前記制御装置が、前記第1電圧検出手段によって検出された第1の電圧値と前記第2電圧検出手段によって検出された第2の電圧値と電力指令値とに基づいて前記第1ブリッジ回路の出力と前記第2ブリッジ回路の出力との位相差を演算する位相差演算部と、前記位相差演算部による演算結果と前記第1の電圧値と前記第2の電圧値とによって前記位相差に生じる誤差を補償する補償量を演算する補償量演算部と、前記位相差演算部の演算結果と前記補償量演算部の演算結果から前記第1の半導体スイッチング素子のゲート信号および前記第2の半導体スイッチング素子のゲート信号を生成するPWM信号生成部とを備えたことを特徴とする電力変換装置。
- 前記補償量演算部は、前記位相差演算部で演算された前記位相差と前記第1の電圧値と前記第2の電圧値とに基づいて前記補償量を演算することを特徴とする請求項1に記載の電力変換装置。
- 前記補償量演算部は、前記位相差演算部で演算された前記位相差と前記第1の電圧値と前記第2の電圧値とに基づいて前記第1の半導体スイッチング素子および前記第2の半導体スイッチング素子がターンオンする直前の電流を演算し、前記演算した電流から前記第1ブリッジ回路および前記第2ブリッジ回路において、ZVS動作が達成できているか否かを判定することを特徴とする請求項1に記載の電力変換装置。
- 前記補償量演算部は、前記第1ブリッジ回路および前記第2ブリッジ回路の内、負荷側のブリッジ回路でZVS動作が達成できていない場合に、前記短絡防止期間に相当する位相量を前記位相差演算部で演算した前記位相差と逆極性で出力することを特徴とする請求項3に記載の電力変換装置。
- 前記補償量演算部は、前記第1ブリッジ回路および前記第2ブリッジ回路の内、電源側のブリッジ回路でZVS動作が達成できていない場合に、前記短絡防止期間に相当する位相量を前記位相差演算部で演算した前記位相差と同極性で出力することを特徴とする請求項3に記載の電力変換装置。
- 前記補償量演算部は、前記位相差演算部で演算された前記位相差と前記第1の電圧値と前記第2の電圧値とに基づいて前記第1の半導体スイッチング素子および前記第2の半導体スイッチング素子がターンオンする直前の電流を演算し、前記トランスに入力される交流電流がゼロになる期間の有無を判定することを特徴とする請求項1に記載の電力変換装置。
- 前記補償量演算部は、前記交流電流がゼロになる期間が発生する場合に、前記交流電流がゼロになる期間に相当する位相量を演算し、前記位相差演算部で演算された前記位相差と同極性で出力することを特徴とする請求項6に記載の電力変換装置。
- 前記制御装置は、前記位相差演算部で演算された前記位相差と前記第1の電圧値と前記第2の電圧値に基づいて前記第1の半導体スイッチング素子および前記第2の半導体スイッチング素子がターンオンする直前の電流と前記トランスに入力される交流電流がゼロになる期間とを演算するスイッチング時電流および電流ゼロ時位相演算部と、前記第1の半導体スイッチング素子および前記第2の半導体スイッチング素子がターンオンする直前の電流に基づいて前記第1ブリッジ回路および前記第2ブリッジ回路においてZVS動作が達成できているか否かを判定するZVS動作判定部と、前記交流電流がゼロになる期間の有無を判定する電流ゼロ期間判定部とを、前記補償量演算部の前に備えたことを特徴とする請求項1に記載の電力変換装置。
- 前記電流ゼロ期間判定部は、前記交流電流がゼロになる期間が発生するか否かの判定を、前記スイッチング時電流および電流ゼロ時位相演算部にて演算された前記交流電流がゼロになる位相に基づいて行うことを特徴とする請求項8に記載の電力変換装置。
- 前記トランスに入力される交流電流を検出する電流検出手段を備え、前記スイッチング時電流および電流ゼロ時位相演算部が、前記電流検出手段で検出した電流に基づいて前記第1の半導体スイッチング素子および前記第2の半導体スイッチング素子がターンオンする直前の電流を検出するスイッチング時電流検出手段と、電流ゼロ時位相演算部とを備えていることを特徴とする請求項8に記載の電力変換装置。
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| JP2023516862A JP7638369B2 (ja) | 2021-04-26 | 2021-04-26 | 電力変換装置 |
| DE112021007583.7T DE112021007583T5 (de) | 2021-04-26 | 2021-04-26 | Elektrische Leistungswandlungsvorrichtung |
| PCT/JP2021/016582 WO2022230005A1 (ja) | 2021-04-26 | 2021-04-26 | 電力変換装置 |
| US18/548,255 US20240235404A9 (en) | 2021-04-26 | 2021-04-26 | Electric power conversion apparatus |
| CN202180095911.5A CN117099294A (zh) | 2021-04-26 | 2021-04-26 | 功率转换装置 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013027201A (ja) * | 2011-07-22 | 2013-02-04 | Ihi Corp | 直流電力変換装置 |
| JP2013251998A (ja) * | 2012-06-01 | 2013-12-12 | Meidensha Corp | 双方向絶縁型dc−dcコンバータの制御装置 |
| WO2015056503A1 (ja) * | 2013-10-18 | 2015-04-23 | 東芝三菱電機産業システム株式会社 | 双方向絶縁型dc/dcコンバータおよびそれを用いたスマートネットワーク |
| JP2018170845A (ja) * | 2017-03-29 | 2018-11-01 | パナソニックIpマネジメント株式会社 | 電力変換装置 |
| US20190372471A1 (en) * | 2018-06-04 | 2019-12-05 | Zhejiang University | Control method of constant-voltage-gain isolation type bidirectional full-bridge dc/dc converter |
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| WO2016125374A1 (ja) | 2015-02-02 | 2016-08-11 | 三菱電機株式会社 | Dc/dcコンバータ |
| EP3651331A4 (en) * | 2017-07-04 | 2021-04-07 | Mitsubishi Electric Corporation | Power conversion device |
| JP7099356B2 (ja) * | 2019-02-19 | 2022-07-12 | オムロン株式会社 | 電力変換装置 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013027201A (ja) * | 2011-07-22 | 2013-02-04 | Ihi Corp | 直流電力変換装置 |
| JP2013251998A (ja) * | 2012-06-01 | 2013-12-12 | Meidensha Corp | 双方向絶縁型dc−dcコンバータの制御装置 |
| WO2015056503A1 (ja) * | 2013-10-18 | 2015-04-23 | 東芝三菱電機産業システム株式会社 | 双方向絶縁型dc/dcコンバータおよびそれを用いたスマートネットワーク |
| JP2018170845A (ja) * | 2017-03-29 | 2018-11-01 | パナソニックIpマネジメント株式会社 | 電力変換装置 |
| US20190372471A1 (en) * | 2018-06-04 | 2019-12-05 | Zhejiang University | Control method of constant-voltage-gain isolation type bidirectional full-bridge dc/dc converter |
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| DE112021007583T5 (de) | 2024-02-29 |
| US20240235404A9 (en) | 2024-07-11 |
| CN117099294A (zh) | 2023-11-21 |
| US20240136935A1 (en) | 2024-04-25 |
| JPWO2022230005A1 (ja) | 2022-11-03 |
| JP7638369B2 (ja) | 2025-03-03 |
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