WO2011092932A1 - Dc/dc電力変換装置 - Google Patents
Dc/dc電力変換装置 Download PDFInfo
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- WO2011092932A1 WO2011092932A1 PCT/JP2010/071238 JP2010071238W WO2011092932A1 WO 2011092932 A1 WO2011092932 A1 WO 2011092932A1 JP 2010071238 W JP2010071238 W JP 2010071238W WO 2011092932 A1 WO2011092932 A1 WO 2011092932A1
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4837—Flying capacitor converters
Definitions
- This invention relates to a DC / DC power converter for converting a DC voltage into a DC voltage obtained by stepping up or stepping down the DC voltage.
- the conventional DC / DC power converter performs the voltage conversion from direct current to direct current by controlling the amount of energy stored in and discharged from the reactor using the on / off operation of the semiconductor switch.
- this reactor since this reactor has a problem that it is large and heavy, the voltage applied to the reactor is reduced using charging and discharging of the capacitor, and the reactor is reduced in size by reducing the inductance value necessary for the reactor.
- a technique for reducing the weight is disclosed (for example, see Patent Document 1).
- the voltage between the terminals of the charge / discharge capacitor can be controlled to an arbitrary value during normal operation, so that the DC / DC power conversion device is applied to a switching element or a diode constituting the DC voltage conversion unit.
- the voltage can be made almost equal.
- the switching element when the switching element has stopped operating because the control power supply is not on standby, or in order to prevent a spillover failure due to some abnormality occurring in the DC / DC power converter, the switching element If the input voltage Vin is applied to the input terminal of the DC power source when the switching element is not controlled to be turned on / off (hereinafter referred to as a control stop state), such as when the operation is stopped, Problems occur. That is, in the above case, since the switching element is off, the output voltage Vout is almost the same as the input voltage Vin, but the voltage between the terminals of the charge / discharge capacitor is zero, so that the DC voltage conversion unit is configured. All voltages are applied to the switching elements and diodes. As a result, there is a risk that the switching element and the diode of the DC voltage converter are destroyed by overvoltage.
- the present invention has been made to solve the above-described problems, and a voltage is applied to the input terminal of the DC power supply when the switching elements constituting the DC voltage conversion unit are in the control stop state. Even in such a case, it is an object to always maintain a voltage between terminals of a charge / discharge capacitor at a desired value. Further, even if a switching element or a diode having a low withstand voltage is used as a switching element or a diode of the DC voltage conversion unit, it is possible to surely avoid the risk of element destruction, and thereby a low-cost and high-efficiency DC / DC power conversion device Can be provided.
- a DC / DC power converter includes a reactor connected to a DC power source, DC connected to the reactor and having a plurality of switching elements, a charging / discharging capacitor that is charged / discharged by turning on / off the switching element, and a plurality of diodes that provide a charging path and a discharging path of the charging / discharging capacitor A voltage converter; A smoothing capacitor on the output side having a plurality of voltage dividing capacitors connected to the DC voltage conversion unit and connected in series; A voltage equalizing switch element installed on a connecting line provided between the negative electrode side terminal of the charge / discharge capacitor and the connection point of the voltage dividing capacitors.
- the DC / DC power converter according to the present invention is a smoothing capacitor connected in parallel with a DC power source and smoothing a DC voltage, and is an input side composed of a plurality of voltage dividing capacitors connected in series to each other.
- a smoothing capacitor ;
- a reactor connected to the DC power source;
- DC connected to the reactor and having a plurality of switching elements, a charging / discharging capacitor that is charged / discharged by turning on / off the switching element, and a plurality of diodes that provide a charging path and a discharging path of the charging / discharging capacitor
- a voltage converter A smoothing capacitor on the output side connected to the DC voltage converter;
- a voltage equalizing switch element installed on a connection line provided between the negative electrode side terminal of the charge / discharge capacitor and the connection point of the voltage dividing capacitors of the smoothing capacitor on the input side.
- the DC / DC power converter when a voltage is applied to the input terminal of the DC power supply when the switching element constituting the DC voltage converter is in the control stop state, the voltage equalization is performed from the charge / discharge capacitor.
- the charging current flows through a part of the switching element and the voltage dividing capacitor, the voltage between the terminals of the charging / discharging capacitor is maintained at a voltage corresponding to the divided potential of each voltage dividing capacitor constituting the smoothing capacitor. Be drunk.
- the voltage applied to the semiconductor elements such as switching elements and diodes can be equalized.
- it is possible to use a low-breakdown-voltage semiconductor element or capacitor and as a result, it is possible to provide a low-cost and high-efficiency DC / DC power converter.
- FIG. 1 is a circuit configuration diagram of a DC / DC power conversion apparatus according to Embodiment 1 of the present invention.
- a DC input voltage Vin input between a VL terminal and a Vcom terminal from a DC power supply (not shown) is boosted to a voltage equal to or higher than the input voltage Vin
- the output voltage Vout is output between the VH terminal and the Vcom terminal.
- the DC / DC power converter includes an input-side smoothing capacitor Ci that smoothes the input voltage Vin, an energy storage reactor L, and a DC voltage converter A that boosts the input voltage Vin to the output voltage Vout.
- the output-side smoothing capacitor Co is provided for smoothing the output voltage Vout boosted by the DC voltage converter A.
- the DC voltage conversion unit A has two switching elements S1 and S2, two diodes D1 and D2, and a charge / discharge capacitor Cf.
- Each of the switching elements S1 and S2 is composed of, for example, a MOSFET, and is turned on when the gate signal is High here.
- the output-side smoothing capacitor Co is configured by connecting two voltage dividing capacitors Co1 and Co2 in series, and further includes a diode Df as a voltage equalizing switch element.
- the smoothing capacitor Ci on the input side has a high voltage side terminal connected to the input terminal VL and a low voltage side terminal connected to the reference voltage terminal Vcom.
- the low voltage side terminal of one voltage dividing capacitor Co1 is the reference voltage terminal Vcom
- the high voltage side terminal of the other voltage dividing capacitor Co2 is the output terminal. Connected to VH.
- the two switching elements S1 and S2 and the two diodes D1 and D2 constituting the DC voltage converter A are sequentially connected in series.
- the source terminal of the switching element S1 is connected to the reference voltage terminal Vcom
- the cathode terminal of the diode D2 is connected to the output terminal VH
- the connection point between the drain terminal of the switching element S2 and the anode terminal of the diode D1 is connected to the input terminal VL via the reactor L. It is connected to the.
- the charge / discharge capacitor Cf has a low-voltage side terminal connected to a connection point between the drain terminal of the switching element S1 and the source terminal of the switching element S2, and a high-voltage side terminal connected to the cathode terminal of the diode D1 and the anode terminal of the diode D2. And connected to the connection point.
- the voltage equalizing diode Df has its anode terminal connected to the low-voltage side terminal of the charge / discharge capacitor Cf and its cathode terminal connected to the connection point of the voltage dividing capacitors Co1 and Co2.
- the control circuit 10 is a circuit for controlling on / off of the switching elements S1 and S2 of the DC voltage converter A, and outputs gate signals Gs1 and Gs2 to the switching elements S1 and S2, respectively.
- the control circuit 10 includes an input voltage detection value Vins, an output voltage detection value Vouts, a voltage detection value Vcfs between terminals of the charge / discharge capacitor Cf, a voltage detection value Vco1s between terminals of the voltage dividing capacitor Co1, and a voltage between terminals of the voltage dividing capacitor Co2.
- the detection value Vco2s is input.
- the control circuit 10 receives an output voltage command value Vo * or an input voltage command value Vi * from a host controller (not shown), and further receives a voltage command value Vcf * of the charge / discharge capacitor Cf. Note that these command values Vo *, Vi *, and Vcf * may be generated in the control circuit 10.
- the control circuit 10 generates gate signals Gs1 and Gs2 based on, for example, the output voltage command value Vo *, the output voltage detection value Vouts, the voltage command value Vcf * of the charge / discharge capacitor Cf, and the voltage detection value Vcfs. Output. Further, the input voltage detection value Vins is necessary when controlling the input voltage Vin, and the voltage detection values Vco1s and Vco2s between the terminals of the voltage dividing capacitors Co1 and Co2 are necessary when overvoltage protection or the like is provided.
- the steady state refers to a state when the switching elements S1 and S2 are on / off controlled and the output voltage is stably obtained.
- mode 1 to mode 4 as the operation mode of the DC / DC power converter in the steady state.
- mode 1 the switching element S1 is turned on and the switching element S2 is turned off, and energy is stored in the charge / discharge capacitor Cf.
- mode 2 the switching element S1 is turned off and the switching element S2 is turned on, and the energy of the charge / discharge capacitor Cf is released.
- mode 3 the switching elements S1 and S2 are both turned off, and the reactor L energy is released.
- mode 4 the switching elements S1 and S2 are both turned on, and energy is stored in the reactor L.
- the above-described DC / DC power conversion device operates differently in a steady state when the step-up ratio N of the output voltage Vout with respect to the input voltage Vin is two times or less.
- FIG. 3 shows the gate signal voltage waveform of the switching elements S1 and S2, the current waveform IL of the reactor L, the current waveform Icf of the charge / discharge capacitor Cf, and the charge / discharge capacitor Cf when the boost ratio N is 2 times or less.
- the terminal voltage Vcf is shown.
- the voltage Vcf between the terminals of the charge / discharge capacitor Cf is controlled to be about a half of the output voltage Vout, and the input voltage Vin, the output voltage Vout, and the terminals of the charge / discharge capacitor Cf are controlled.
- the magnitude relationship of the inter-voltage Vcf is as follows. Vout>Vin> Vcf
- the input voltage Vin input between the VL terminal and the Vcom terminal is boosted to an arbitrary voltage of 1 to 2 times, and output as an output voltage Vout between the VH terminal and the Vcom terminal.
- FIG. 4 shows the gate signal voltage waveforms of the switching elements S1 and S2, the current waveform IL of the reactor L, the current waveform Icf of the charge / discharge capacitor Cf, and the charge / discharge capacitor Cf when the step-up ratio N is twice or more.
- the terminal voltage Vcf is shown.
- the voltage Vcf between the terminals of the charge / discharge capacitor Cf is controlled to be about a half of the output voltage Vout, and the input voltage Vin, the output voltage Vout, and the voltage between the terminals of the charge / discharge capacitor Cf are controlled.
- the magnitude relationship of Vcf is as follows. Vout>Vcf> Vin
- the input voltage Vin input between the VL terminal and the Vcom terminal is boosted to an arbitrary voltage more than twice, and is output as the output voltage Vout between the VH terminal and the Vcom terminal.
- the switching elements S1 and S2 stop operating, or some sort of abnormality occurs in the DC / DC power converter to prevent the ripple effect.
- the switching elements S1 and S2 are not controlled to be turned on / off (control stopped state), such as when the switching elements S1 and S2 are not operating, the input voltage between the VL terminal and the Vcom terminal.
- both the switching elements S1 and S2 are in the control stop state, both the switching elements S1 and S2 are in the off state, so that the current flows through the following three paths, so that each capacitor Cf, Co1 , Co2 are charged.
- VL ⁇ Ci ⁇ Vcom VL ⁇ L ⁇ D1 ⁇ D2 ⁇ Co2 ⁇ Co1 ⁇ Vcom
- the input voltage Vin is applied to the smoothing capacitor Ci, and at the same time, a connection body of the charge / discharge capacitor Cf and the voltage dividing capacitor Co2 connected in parallel to each other, and a voltage dividing capacitor connected in series to the connection body. It is applied to Co1.
- Cf, Co1, and Co2 indicate the capacitances of the charge / discharge capacitor Cf, the voltage dividing capacitor Co1, and the voltage dividing capacitor Co2, respectively.
- Vds2 applied between the drain and source of one switching element S2 is equal to the inter-terminal voltage Vcf of the charge / discharge capacitor Cf
- Vin / 2 is obtained from the above equation.
- the voltage Vds1 applied between the drain and source of the other switching element S1 is the difference between the voltage Vcf between the VH terminal and the Vcom terminal and the voltage Vcf between the terminals of the charge / discharge capacitor Cf.
- the voltage equalizing diode Df By providing this, it is possible to eliminate imbalance between the voltages Vco2 and Vco1 between the terminals of the voltage dividing capacitors Co2 and Co1.
- the voltages applied between the drains and the sources of the switching elements S1 and S2 are both equalized to Vin / 2. For this reason, it becomes possible to use a low-breakdown-voltage semiconductor element and capacitor, and it is possible to provide a low-cost and high-efficiency DC / DC power converter.
- the DC / DC power converter when the DC / DC power converter is in a steady state as shown in FIG. 2, the voltage Vcf between the terminals of the charge / discharge capacitor Cf is approximately half of the output voltage Vout as described above. It explained that it is controlling.
- the DC / DC power converter is operated more stably by controlling the inter-terminal voltage Vcf of the charge / discharge capacitor Cf to be slightly larger than a half of the output voltage Vout. It becomes possible. The reason for this will be described below.
- the voltage Vcf between the terminals of the charge / discharge capacitor Cf may be maintained at a value equal to or higher than the voltage Vco2 between the terminals of one voltage dividing capacitor Co2.
- the minimum value Vcf (min) of the voltage between the terminals of the charge / discharge capacitor Cf considering the ripple voltage is set to be equal to or greater than the maximum value Vco2 (max) of the voltage between the terminals of one voltage dividing capacitor Co2. It may be controlled to. That is, Vcf (min) ⁇ Vco2 (max) By setting so as to be, it becomes possible to eliminate the unstable operation such as causing the voltage imbalance of both the voltage dividing capacitors Co1 and Co2.
- the voltage equalizing diode Df is provided between the negative electrode side terminal of the charge / discharge capacitor Cf and the connection point between the two voltage dividing capacitors Co1 and Co2, as shown in FIG.
- the current limiting resistor Rf may be connected in series in addition to the diode Df.
- the diode Df is provided between the negative terminal of the charge / discharge capacitor Cf and the connection point between the voltage dividing capacitors Co1 and Co2.
- the diode Df instead of the diode Df, A similar effect can be obtained by providing a so-called normally-on type relay that turns on when the switching elements S1 and S2 are in the control stop state and turns off when the switching operation is in a steady state.
- both switching elements S1, S2 when both switching elements S1, S2 are in the control stop state, even when the input voltage Vin is applied between the VL terminal and the Vcom terminal, both switching elements S1, S2 Since the voltage applied between the drain and the source can be equalized, it is possible to use a low-breakdown-voltage semiconductor element or capacitor, and to provide a low-cost and high-efficiency DC / DC power converter.
- the voltage Vcf between the terminals of the charge / discharge capacitor Cf is controlled to be slightly larger than the voltage Vco2 between the terminals of the one voltage dividing capacitor Co2, so that the voltage dividing capacitors Co1, C1 connected in series with each other are connected.
- the voltage imbalance of Co2 can be more reliably prevented, and a highly reliable DC / DC power converter capable of stable operation can be provided.
- FIG. FIG. 7 is a circuit configuration diagram of a DC / DC power conversion apparatus according to Embodiment 2 of the present invention, and components corresponding to or corresponding to those of Embodiment 1 shown in FIG.
- the difference from the DC / DC power converter according to the first embodiment is that the voltage equalization diode Df is connected to the connection point between the voltage dividing capacitors Co1 and Co2 constituting the output-side smoothing capacitor Co.
- the Zener diode Dz is inserted. Since the other configuration and the basic operation of the DC / DC power converter are the same as those in the first embodiment, the significance of inserting the Zener diode Dz will be described in more detail here.
- the inter-terminal voltage Vcf of the charge / discharge capacitor Cf is set to be less than half of the output voltage Vout.
- the voltage was controlled to be slightly higher.
- the ripple current of the reactor L increases, causing problems such as an increase in reactor loss and an increase in reactor noise. Will occur.
- FIG. 8 shows, as an example, the gate signal voltage waveforms of both switching elements S1 and S2, the current waveform IL of the reactor L, the current waveform Icf of the charge / discharge capacitor Cf when the step-up ratio N is 2 times or less in a steady state, The relationship of the voltage Vcf between the terminals of the charging / discharging capacitor
- the one-dot chain line waveform of reactor current IL indicates a waveform when charge / discharge capacitor voltage Vcf is half of output voltage Vout, and the solid line waveform of reactor current IL is output by charge / discharge capacitor voltage Vcf. The waveform is shown when the voltage Vout is greater than one half.
- the ripple current of the reactor L contains a frequency component that is twice the switching frequency (1 / Ts) and a frequency component that is equal to the switching frequency.
- a Zener diode Dz is inserted between the diode Df and the connection point of the voltage dividing capacitors Co1 and Co2. This suppresses the occurrence of voltage imbalance in the voltage dividing capacitors Co1 and Co2 in the control stop state of the switching element to ensure the stable operation of the DC / DC power converter, and the low frequency flowing in the reactor L in the steady state. The ripple current component is reduced.
- the input voltage Vin is applied to the smoothing capacitor Ci on the input side, and at the same time, a connection body of the charge / discharge capacitor Cf and the voltage dividing capacitor Co2 connected in parallel with each other via the Zener diode Dz, and this connection body To the voltage dividing capacitor Co1 connected in series.
- Cf ⁇ Co1 Co2
- Vcf of the charge / discharge capacitor Cf is: Vcf ⁇ Vin / 2-Vzd It becomes.
- Vzd represents the voltage across the Zener diode Dz
- Cf, Co1, and Co2 represent the capacitances of the charge / discharge capacitor Cf, the voltage dividing capacitor Co1, and the voltage dividing capacitor Co2, respectively.
- both the switching elements S1 and S2 are in the control stop state, and both the switching elements S1 and S2 are both
- the Zener diode Dz is turned on so that the voltage applied between the drain and source of the switching elements S1 and S2 is substantially reduced. Can be equalized. For this reason, it becomes possible to use a low-breakdown-voltage semiconductor element and capacitor, and it is possible to provide a low-cost and high-efficiency DC / DC power converter.
- the Zener diode Dz may be turned off. That is, the sum of the inter-terminal voltage Vcf of the charge / discharge capacitor Cf and the breakdown voltage Vzd of the Zener diode Dz may be made larger than the inter-terminal voltage Vco2 of one voltage dividing capacitor Co2, that is, Vcf + Vzd ⁇ Vco2.
- the current path at this time is as follows. Ci ⁇ L ⁇ S2 ⁇ Cf ⁇ D2 ⁇ Co2 ⁇ Co1
- the Zener diode Dz may be turned off. That is, the sum of the inter-terminal voltage Vcf of the charge / discharge capacitor Cf and the breakdown voltage Vzd of the Zener diode Dz may be made larger than the inter-terminal voltage Vco2 of the voltage dividing capacitor Co2, that is, Vcf + Vzd ⁇ Vco2.
- the current path at this time is as follows. Ci ⁇ L ⁇ D1 ⁇ D2 ⁇ Co2 ⁇ Co1
- the breakdown voltage Vzd of the Zener diode Dz is Vzd ⁇ Vco2 (max) ⁇ Vcf (min) May be set to a value satisfying.
- Vcf (min) is the minimum value of the inter-terminal voltage of the charge / discharge capacitor Cf considering the ripple voltage
- Vco2 (max) is the maximum value of the inter-terminal voltage of the smoothing capacitor Co2.
- the Zener diode Dz is inserted between the diode Df and the connection point of the voltage dividing capacitors Co1 and Co2, and the VL terminal is used when both the switching elements S1 and S2 are in the control stop state.
- the Zener diode Dz is turned on to prevent the voltage imbalance of the voltage dividing capacitors Co1 and Co2 from occurring, and the drains of the switching elements S1 and S2 The voltage applied between the sources is almost equalized.
- the breakdown voltage Vzd of the Zener diode Dz is appropriately set so that the Zener diode Dz is turned off, thereby reducing the low-frequency ripple current component flowing through the reactor L.
- the second embodiment it is possible to achieve both the suppression of the voltage imbalance of the voltage dividing capacitors Co1 and Co2 and the reduction of the low-frequency ripple current component flowing through the reactor L. It is possible to provide a highly reliable DC / DC power conversion device that can perform stable operation with noise.
- the Zener diode Dz is inserted between the connection point of the diode Df and the voltage dividing capacitors Co1 and Co2.
- the Zener diode Dz is connected in series. Further, the same effect can be obtained by inserting a current limiting resistor.
- FIG. 9 is a circuit configuration diagram of a DC / DC power conversion apparatus according to Embodiment 3 of the present invention, and components corresponding to or corresponding to those of Embodiment 1 shown in FIG.
- the load connected to the DC / DC power converter may be connected not only to a load that consumes power unilaterally but also to a load that generates regenerative power.
- a load that generates regenerative power is connected to the output side of the DC / DC power converter
- the output voltage Vout increases due to the regenerative power
- the increased voltage of the output voltage Vout are all applied to the switching elements and diodes constituting the DC voltage converter A.
- the overvoltage breakdown may occur in the switching element and the diode of the DC voltage conversion unit A, and the element breakdown may occur.
- the step-up ratio N is 2 times or less
- the voltage between the terminals of the initial charge / discharge capacitor Cf is Vcf0
- both switching elements S1 , S2 are both off.
- Vout When the output voltage Vout gradually increases from time t0 due to regenerative power and Vout ⁇ Vin + Vcf0 at time t1, current flows in the following path in addition to the current path.
- Vcf Vout ⁇ Vin.
- the output voltage Vout is applied to the connection body of the charge / discharge capacitor Cf and the voltage dividing capacitor Co2 connected in parallel to each other and the voltage dividing capacitor Co1 connected in series to the connection body.
- the third embodiment can cope with a case where a load that generates regenerative power is connected to the output side of the DC / DC power converter and the output voltage Vout increases due to the regenerative power. . That is, in the third embodiment, by providing the current return diode Dh, the inter-terminal voltage Vcf of the charge / discharge capacitor Cf becomes a voltage corresponding to the divided potential of the voltage dividing capacitors Co1 and Co2, and therefore, both switching The voltages applied to the elements S1, S2 and the diodes D1, D2 can be substantially equalized. For this reason, it becomes possible to use a low-breakdown-voltage semiconductor element and capacitor, and it is possible to provide a low-cost and high-efficiency DC / DC power converter.
- the third embodiment has been described as a configuration in which the current return diode Dh is inserted between the positive terminal of the charge / discharge capacitor Cf and the cathode terminal of the current return diode Df, FIG. Similar to the above case, the same effect can be obtained by further inserting a current limiting resistor between the connection point of both diodes Df and Dh and the connection point of both voltage dividing capacitors Co1 and Co2.
- the switching elements S1 and S2 are in the switching operation stop state, Not only when the input voltage Vin is applied between the VL terminal and the Vcom terminal, but also when the output voltage Vout increases due to regenerative power from the load, the switching elements S1, S2 and the diodes D1, D2 There is an advantage that device breakdown can be prevented by substantially equalizing the voltage applied to.
- the output voltage Vout is increased by the regenerative power
- the diode Df may be omitted, and only the current return diode Dh may be inserted between the positive terminal of the charge / discharge capacitor Cf and the connection point of the voltage dividing capacitors Co1 and Co2.
- FIG. 11 is a circuit configuration diagram of a DC / DC power conversion apparatus according to Embodiment 4 of the present invention, and components corresponding to or corresponding to those of Embodiment 1 shown in FIG.
- the DC / DC power converter according to the fourth embodiment is characterized in that the output-side smoothing capacitor Co is a single one, while the input-side smoothing capacitor Ci connects two voltage dividing capacitors Ci1 and Ci2 in series. And a relay S4 as a voltage equalizing switch element.
- the voltage equalizing relay S4 is a normally-on type relay that is turned on when the switching elements S1 and S2 are in the control stop state and turned off when the switching operation is in a steady state.
- One terminal is connected to the low-voltage side terminal of the charge / discharge capacitor Cf constituting the DC voltage converter A, and the other terminal is connected to the connection point of the voltage dividing capacitors Ci1 and Ci2.
- the control circuit 10 includes an input voltage detection value Vins, an output voltage detection value Vouts, a voltage detection value Vcfs between terminals of the charge / discharge capacitor Cf, voltage detection values Vci1s and Vci2s between terminals of the voltage dividing capacitors Ci1 and Ci2, and smoothing.
- a terminal-terminal voltage detection value Vcos of the capacitor Co is input.
- the control circuit 10 receives an output voltage command value Vo * or an input voltage command value Vi * from a host controller (not shown), and further a voltage command value Vcf of the charge / discharge capacitor Cf. * Is entered.
- the control circuit 10 outputs gate signals Gs1 and Gs2 to the switching elements S1 and S2 of the DC voltage converter A, and outputs an on / off signal to the relay S4. Since the other configuration is the same as that of the first embodiment shown in FIG. 1, detailed description is omitted here.
- the OFF state of the relay S4 is maintained. A holding signal is input.
- the relay S4 is turned off, the basic boosting operation in the steady state is the same as in the first to third embodiments.
- the input voltage Vin is applied to the output-side smoothing capacitor Co.
- the input voltage Vin is connected in series with the connection body of the charge / discharge capacitor Cf and the voltage dividing capacitor Ci2 connected in parallel to each other.
- the voltage is applied to the connected voltage dividing capacitor Ci1.
- Vcf Vout / 2
- FIG. FIG. 12 is a circuit configuration diagram of a DC / DC power conversion device according to Embodiment 5 of the present invention, and components corresponding to or corresponding to those of Embodiment 1 shown in FIG.
- the input voltage Vin input between the VL terminal and the Vcom terminal is boosted to a voltage equal to or higher than Vin, and the boosted output voltage Vout is between the VH terminal and the Vcom terminal. Is output.
- the DC voltage conversion unit A according to the fifth embodiment includes three switching elements S1, S2, S3, three diodes D1, D2, D3, and two charge / discharge capacitors Cf1, Cf2.
- the output-side smoothing capacitor Co is configured by sequentially connecting three voltage dividing capacitors Co1, Co2, and Co3 in series, and further includes two diodes Df1 and Df2 as voltage equalizing switch elements.
- the three switching elements S1, S2, S3 and the three diodes D1, D2, D3 are sequentially connected in series.
- the source terminal of the switching element S1 is connected to the reference voltage terminal Vcom
- the cathode terminal of the diode D3 is connected to the output terminal VH
- the connection point between the drain terminal of the switching element S3 and the anode terminal of the diode D1 is connected to the input terminal VL via the reactor L. Has been.
- One charge / discharge capacitor Cf1 has a low-voltage side terminal at the connection point between the drain terminal of the switching element S1 and the source terminal of the switching element S2, and a high-voltage side terminal at the cathode terminal of the diode D2 and the anode terminal of the diode D3. Connected to the connection point.
- the other charge / discharge capacitor Cf2 has a low-voltage side terminal connected to the connection point between the drain terminal of the switching element S2 and the source terminal of the switching element S3, and a high-voltage side terminal connected to the cathode terminal of the diode D1 and the anode terminal of the diode D2. Connected to a point.
- the low voltage side terminal of the voltage dividing capacitor Co1 is connected to the reference voltage terminal Vcom, and the high voltage side terminal of the voltage dividing capacitor Co3 is connected to the output terminal VH.
- one diode Df1 for voltage equalization has its anode terminal connected to the low voltage side terminal of one charge / discharge capacitor Cf1, and its cathode terminal connected to the connection point of the voltage dividing capacitors Co1 and Co2.
- the other diode Df2 for voltage equalization has its anode terminal connected to the low voltage side terminal of the charge / discharge capacitor Cf2, and its cathode terminal connected to the connection point of the voltage dividing capacitors Co2 and Co3.
- the control circuit 10 includes an input voltage detection value Vins, an output voltage detection value Vouts, voltage detection values Vcfs1 and Vcfs2 between charge / discharge capacitors Cf1 and Cf2, voltage detection values Vco1s between terminals of voltage dividing capacitors Co1, Co2, and Co3, Vco2s and Vco3s are input.
- the control circuit 10 receives an output voltage command value Vo * or an input voltage command value Vi * from a host controller (not shown), and further a voltage command value Vcf of the charge / discharge capacitor Cf. * Is entered.
- the control circuit 10 outputs gate signals Gs1, Gs2, and Gs3 to the switching elements S1, S2, and S3 of the DC voltage conversion unit A, respectively.
- Other configurations are the same as those of the first embodiment shown in FIG.
- FIG. 13 shows the gate signal voltage waveforms of the switching elements S1, S2, S3, the current waveform IL of the reactor L, and the current waveforms Icf1, Icf2 of the charge / discharge capacitors Cf1, Cf2 when the step-up ratio is 3 times or more. Is shown.
- the inter-terminal voltage Vcf1 of one charging / discharging capacitor Cf1 is about two-thirds of the output voltage Vout
- the inter-terminal voltage Vcf2 of the other charging / discharging capacitor Cf2 is about one-third of the output voltage Vout.
- the input voltage Vin, the output voltage Vout, and the inter-terminal voltages Vcf1 and Vcf2 of the charge / discharge capacitor are as follows. Vout>Vcf1>Vcf2> Vin
- the input voltage Vin input between the VL terminal and the Vcom terminal is boosted to an arbitrary voltage three times or more, and is output as the output voltage Vout between the VH terminal and the Vcom terminal.
- the operation in which the step-up ratio N is 3 times or more has been described.
- the switching elements S1, S2, and S3 are in the respective periods t1, t3, and t5 in FIG. Since all are turned off, the operations are the same except that the energy accumulated in the reactor L through the following path is superimposed on the smoothing capacitor Ci and transferred to the voltage dividing capacitors Co1, Co2, Co3. It is possible to output N voltage. Ci->L->D1->D2->D3->Co3->Co2-> Co1
- the input voltage Vin is applied to the smoothing capacitor Ci on the input side, and at the same time, a series body of the charge / discharge capacitor Cf1 and the voltage dividing capacitor Co1 or a series body of the charge / discharge capacitor Cf2 and the voltage dividing capacitors Co2 and Co1. Will be applied.
- the value is one third of the input voltage Vin.
- the voltage Vds2 applied between the drain and source of the switching element S2 is a difference between the inter-terminal voltages Vcf1 and Vcf2 of both the charge / discharge capacitors Cf1 and Cf2, and thus is a value of one third of the input voltage Vin.
- the voltage Vds3 applied between the drain and source of the switching element S3 is a difference between the voltage between the VH terminal and the Vcom terminal and the voltage Vcf1 between the terminals of the charge / discharge capacitor Cf1, the value is one third of the input voltage Vin. It becomes.
- the voltage equalization is performed between the connection points of one of the diodes Df1 for voltage equalization and the two voltage dividing capacitors Co1 and Co2.
- Zener diodes can be inserted between the connection points of the other diode Df2 and the voltage dividing capacitors Co2 and Co3, respectively.
- a current limiting resistor as shown in FIG. As a result, it is possible to achieve both the reduction of the low-frequency ripple current component flowing through the reactor L and the stable operation of the DC / DC power converter.
- connection between the positive terminal of the charge / discharge capacitor Cf1 and the voltage dividing capacitors Co2 and Co3, and the charge / discharge capacitor Cf2 It is also possible to insert current return diodes between the connection points of the positive terminal and the voltage dividing capacitors Co1 and Co2.
- the voltages applied to the switching elements S1, S2, S3 and the diodes D1, D2, D3 constituting the DC voltage conversion unit A are substantially reduced. Since equalization can be achieved, it is possible to use a low-breakdown-voltage semiconductor element or capacitor, and it is possible to provide a low-cost and high-efficiency DC / DC power converter.
- the switching elements S1 to S3 and the diodes D1 to D3 are described as being connected in series of three. However, a configuration in which four or more series are connected may be used, and in this case, the same effect can be obtained. It is done.
- FIG. FIG. 14 is a circuit configuration diagram of a DC / DC power conversion apparatus according to Embodiment 6 of the present invention, in which components corresponding to or corresponding to those of Embodiment 1 shown in FIG.
- the feature of the DC / DC power converter according to the sixth embodiment is that in the configuration of the DC / DC power converter of the first embodiment (FIG. 1), the charge / discharge capacitor Cf and the output-side smoothing capacitor Co are provided. That is, discharging resistors Rd0, Rd1, and Rd2 are connected in parallel to the respective voltage dividing capacitors Co1 and Co2. Other configurations are the same as the circuit configuration shown in FIG.
- the basic operation in the steady state or when both switching elements S1 and S2 are in the control stop state is the same as that in the first embodiment.
- the operation and effect of adding the discharge resistors Rd0, Rd1, and Rd2 will be described.
- each semiconductor element such as the switching elements S1 and S2 and the diodes D1 and D2 has been treated as an ideal element.
- a minute leak current flows.
- the switching elements S1 and S2 when a voltage is applied between the drain and source even when the gate signal is low, a leak current of about several microamperes to several tens of microamperes flows between the drain and source. If this small leakage current cannot be ignored, when the input voltage Vin is applied between the VL terminal and the Vcom terminal when the switching elements S1 and S2 are in the control stop state, the leakage current of one switching element S1 is reduced by the following path. Corresponding minute current flows. VL ⁇ L ⁇ D1 ⁇ Cf ⁇ S1 ⁇ Vcom
- the discharge resistor Rd0 is connected between the terminals of the charge / discharge capacitor Cf.
- the discharging resistor Rd0 is set to a resistance value such that the current flowing through the resistor is larger than the leakage current flowing through one switching element S1.
- the discharge resistor Rd0 causes the discharge current to be larger than the charge current of the charge / discharge capacitor Cf, so that the rise of the voltage Vcf between the terminals of the charge / discharge capacitor Cf is suppressed, and an overvoltage is applied to the switching element S2 and the diode D1. Can be prevented.
- the resistance value is set such that the current flowing through each of the discharge resistors Rd1 and Rd2 is larger than the current flowing through the discharge resistor Rd0.
- the influence of the current flowing through the charge / discharge capacitor Cf to the voltage dividing capacitor Co1 on one side can be reduced, so that the voltage across the terminals of the voltage dividing capacitors Co1 and Co2 can be equalized. .
- the switching elements S1 and S2 By connecting the discharging resistor Rd0 between the terminals of the charge / discharge capacitor Cf, even when the leakage current of the switching element cannot be ignored, the switching elements S1 and S2 The voltage applied between the drain and source can be substantially equalized. For this reason, it becomes possible to use a low-breakdown-voltage semiconductor element and capacitor, and it is possible to provide a low-cost and high-efficiency DC / DC power converter.
- the discharge resistors Rd1 and Rd2 between the terminals of the voltage dividing capacitors Co1 and Co2
- the leakage current flowing through the switching element in the control stop state of the switching elements S1 and S2 Even when cannot be ignored, the voltages applied to the switching elements S1 and S2 and the voltage dividing capacitors Co1 and Co2 can be substantially equalized. Therefore, it becomes possible to use a low-breakdown-voltage semiconductor element and a capacitor, and it is possible to provide a low-cost and high-efficiency DC / DC power converter.
- the DC / DC power conversion device that converts a DC voltage into a boosted DC voltage has been described.
- the present invention is not limited to such a booster type, for example, The present invention can also be applied to a step-down DC / DC power conversion device that uses a switching element instead of the diodes D1, D2, and D3 to convert a direct-current voltage into a direct-current voltage that has been stepped down.
- each diode may be formed of a wide band gap semiconductor having a larger band gap than silicon.
- the wide band gap semiconductor include silicon carbide, a gallium nitride-based material, and diamond.
- each switching element may be formed of a wide band gap semiconductor having a larger band gap than silicon.
- the wide band gap semiconductor include silicon carbide, a gallium nitride-based material, and diamond.
- Switching elements made of wide bandgap semiconductors can be used in high voltage regions where unipolar operation is difficult with silicon semiconductors, greatly reducing the switching loss that occurs when switching the switching element, and greatly reducing power loss become.
- the heat dissipating fins of the heat sink can be downsized and the water cooling portion can be air cooled, so that the semiconductor module can be further downsized.
- a high frequency switching operation is possible, and a reactor, a capacitor, and the like connected to the DC / DC converter can be reduced in size by increasing the carrier frequency of the DC / DC converter operation.
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Abstract
Description
上記リアクトルに接続され、複数のスイッチング素子、当該スイッチング素子のオン/オフにより充放電される充放電コンデンサ、及び上記充放電コンデンサの充電経路と放電経路とを与える複数のダイオードを有している直流電圧変換部と、
上記直流電圧変換部に接続され、互いに直列接続された複数の分圧コンデンサを有する出力側の平滑コンデンサと、
上記充放電コンデンサの負極側端子と上記各分圧コンデンサの相互の接続点との間に設けられた接続線に設置された電圧均等化用のスイッチ素子とを備えている。
上記直流電源に接続されるリアクトルと、
上記リアクトルに接続され、複数のスイッチング素子、当該スイッチング素子のオン/オフにより充放電される充放電コンデンサ、及び上記充放電コンデンサの充電経路と放電経路とを与える複数のダイオードを有している直流電圧変換部と、
上記直流電圧変換部に接続された出力側の平滑コンデンサと、
上記充放電コンデンサの負極側端子と上記入力側の平滑コンデンサの各分圧コンデンサの相互の接続点との間に設けられた接続線に設置された電圧均等化用のスイッチ素子とを備えている。
図1はこの発明の実施の形態1によるDC/DC電力変換装置の回路構成図である。
図3は、昇圧比Nが2倍以下の場合の、スイッチング素子S1及びS2のゲート信号電圧波形と、リアクトルLの電流波形ILと、充放電コンデンサCfの電流波形Icfと、充放電コンデンサCfの端子間電圧Vcfを示している。また、定常状態では、充放電コンデンサCfの端子間電圧Vcfは出力電圧Voutの約2分の1の電圧になるように制御しており、入力電圧Vin、出力電圧Vout、充放電コンデンサCfの端子間電圧Vcfの大小関係は、以下のようになっている。
Vout>Vin>Vcf
Ci→L→D1→Cf→S1
Ci→L→D1→D2→Co2→Co1
Ci→L→S2→Cf→D2→Co2→Co1
Ci→L→D1→D2→Co2→Co1
図4は、昇圧比Nが2倍以上の場合の、スイッチング素子S1及びS2のゲート信号電圧波形と、リアクトルLの電流波形ILと、充放電コンデンサCfの電流波形Icfと、充放電コンデンサCfの端子間電圧Vcfを示している。定常状態では、充放電コンデンサCfの端子間電圧Vcfは出力電圧Voutの約2分の1の電圧になるように制御しており、入力電圧Vin、出力電圧Vout、充放電コンデンサCfの端子間電圧Vcfの大小関係は、以下のようになっている。
Vout>Vcf>Vin
Ci→L→S2→S1
Ci→L→D1→Cf→S1
Ci→L→S2→S1
Ci→L→S2→Cf→D2→Co2→Co1
VL→Ci→Vcom
VL→L→D1→D2→Co2→Co1→Vcom
VL→L→D1→Cf→Df→Co1→Vcom
Vcf={Co2/(Cf+Co1+Co2)}×Vin
となる。なお、上記式の中で、Cf、Co1、Co2は、それぞれ充放電コンデンサCf、分圧コンデンサCo1、分圧コンデンサCo2の静電容量を示す。
Vcf≒Vin/2
となる。
Vds1=Vout-Vcf=Vin-Vin/2=Vin/2
となる。
Ci→L→S2→Cf→D2→Co2→Co1
Ci→L→S2→Df→Co1
Ci→L→D1→Cf→Df→Co1
Vcf(min)≧Vco2(max)
となるように設定することで、上述した両分圧コンデンサCo1,Co2の電圧アンバランスを引き起こすなどの不安定動作を排除することが可能となる。
図7はこの発明の実施の形態2によるDC/DC電力変換装置の回路構成図であり、図1に示した実施の形態1と対応もしくは相当する構成部分には同一の符号を付す。
その他の構成、およびDC/DC電力変換装置の基本動作は、実施の形態1と同様であるから、ここではツェナーダイオードDzを挿入したことによる意義についてさらに詳しく説明する。
VL→Ci→Vcom
VL→L→D1→D2→Co2→Co1→Vcom
VL→L→D1→Cf→Df→Dz→Co1→Vcom
Vcf={Co1/(Cf+Co1+Co2)}×(Vin-2×Vzd)
となる。ここで、Cf<<Co1=Co2とすると、充放電コンデンサCfの端子間電圧Vcfは、
Vcf≒Vin/2-Vzd
となる。なお、VzdはツェナーダイオードDzの端子間電圧、Cf、Co1、Co2はそれぞれ充放電コンデンサCf、分圧コンデンサCo1、分圧コンデンサCo2の静電容量を示す。
Vds1=Vout-Vcf=Vin/2+Vzd
となる。
Ci→L→S2→Cf→D2→Co2→Co1
Ci→L→D1→D2→Co2→Co1
Vzd≧Vco2(max)-Vcf(min)
を満足する値に設定すればよい。ここに、Vcf(min)はリプル電圧を考慮した充放電コンデンサCfの端子間電圧の最小値、Vco2(max)は平滑コンデンサCo2の端子間電圧の最大値である。
図9は、この発明の実施の形態3によるDC/DC電力変換装置の回路構成図であり、図1に示した実施の形態1と対応もしくは相当する構成部分には同一の符号を付す。
VH→Co2→Co1→Vcom
VH→Co2→Dh→Cf→S2→L→Ci→Vcom
この時、充放電コンデンサCfの端子間電圧Vcfは、Vcf=Vout-Vinとなる。
VH→Co2→Co1→Vcom
VH→Co2→Dh→Cf→S1→Vcom
図11は、この発明の実施の形態4によるDC/DC電力変換装置の回路構成図であり、図1に示した実施の形態1と対応もしくは相当する構成部分には同一の符号を付す。
その他の構成は、図1に示した実施の形態1の場合と同様であるから、ここでは詳しい説明は省略する。
VL→Ci2→Ci1→Vcom
VL→L→D1→D2→Co→Vcom
VL→L→D1→Cf→S4→Ci1→Vcom
Vcf={Ci2/(Cf+Ci1+Ci2)}×Vin
となる。
Vcf≒Vin/2=Vout/2
となる。
図12は、この発明の実施の形態5によるDC/DC電力変換装置の回路構成図であり、図1に示した実施の形態1と対応もしくは相当する構成部分には同一の符号を付す。
その他の構成は図1に示した実施の形態1の場合と同様である。
Vout>Vcf1>Vcf2>Vin
Ci→L→S3→S2→S1
Ci→L→S3→Cf2→D2→Cf1→S1
Ci→L→D1→Cf2→S2→S1
Ci→L→S3→S2→Cf1→D3→Co3→Co2→Co1
Ci→L→D1→D2→D3→Co3→Co2→Co1
VL→Ci→Vcom
VL→L→D1→D2→D3→Co3→Co2→Co1→Vcom
VL→L→D1→D2→Cf1→Df1→Co1→Vcom
VL→L→D1→Cf2→Df2→Co2→Co1→Vcom
Vcf1≒2/3×Vin
Vcf2≒1/3×Vin
となる。
図14は、この発明の実施の形態6によるDC/DC電力変換装置の回路構成図であり、図1に示した実施の形態1と対応もしくは相当する構成部分には同一の符号を付す。
VL→L→D1→Cf→S1→Vcom
VL→L→D1→Cf→Df→Co1→Vcom
Claims (12)
- 直流電源に接続されるリアクトルと、
上記リアクトルに接続され、複数のスイッチング素子、当該スイッチング素子のオン/オフにより充放電される充放電コンデンサ、及び上記充放電コンデンサの充電経路と放電経路とを与える複数のダイオードを有している直流電圧変換部と、
上記直流電圧変換部に接続され、互いに直列接続された複数の分圧コンデンサを有する出力側の平滑コンデンサと、
上記充放電コンデンサの負極側端子と上記各分圧コンデンサの相互の接続点との間に設けられた接続線に設置された電圧均等化用のスイッチ素子と、
を備えたDC/DC電力変換装置。 - 上記電圧均等化用のスイッチ素子に対して直列に電流制限抵抗が接続されている請求項1に記載のDC/DC電力変換装置。
- 上記電圧均等化用のスイッチ素子に対して逆直列にツェナーダイオードが接続されている請求項1または請求項2に記載のDC/DC電力変換装置。
- 上記電圧均等化用のスイッチ素子は、ダイオード、または上記直流電圧変換部のスイッチング素子が全て制御停止状態の場合にオンされるノーマリーオンタイプのスイッチである請求項1ないし請求項3のいずれか1項に記載のDC/DC電力変換装置。
- 上記充放電コンデンサの端子間電圧は、上記出力側の平滑コンデンサを構成する分圧コンデンサの高圧側端子と次の分圧コンデンサとの接続点との間の電圧よりも大きな電圧になるように制御される請求項1ないし請求項4のいずれか1項に記載のDC/DC電力変換装置。
- 上記充放電コンデンサの正極側端子と、上記分圧コンデンサの互いの接続点との間に電流還流用のダイオードが接続されている請求項1ないし請求項5のいずれか1項に記載のDC/DC電力変換装置。
- 上記電流還流用のダイオードに対して直列に電流制限抵抗が接続されている請求項6に記載のDC/DC電力変換装置。
- 直流電源と並列に接続され、直流電圧を平滑化する平滑コンデンサであって、相互に直列接続された複数の分圧コンデンサからなる入力側の平滑コンデンサと、
上記直流電源に接続されるリアクトルと、
上記リアクトルに接続され、複数のスイッチング素子、当該スイッチング素子のオン/オフにより充放電される充放電コンデンサ、及び上記充放電コンデンサの充電経路と放電経路とを与える複数のダイオードを有している直流電圧変換部と、
上記直流電圧変換部に接続された出力側の平滑コンデンサと、
上記充放電コンデンサの負極側端子と上記入力側の平滑コンデンサの各分圧コンデンサの相互の接続点との間に設けられた接続線に設置された電圧均等化用のスイッチ素子と、
を備えたDC/DC電力変換装置。 - 上記電圧均等化用のスイッチ素子は、上記直流電圧変換部のスイッチング素子が全て制御停止状態の場合にオンされるノーマリーオンタイプのスイッチである請求項8に記載のDC/DC電力変換装置。
- 上記充放電コンデンサの正極側端子と負極端子との間に、上記充放電コンデンサの蓄積電荷を放電するための放電抵抗が設けられている請求項1から請求項9のいずれか1項に記載のDC/DC電力変換装置。
- 上記放電抵抗の抵抗値は、上記放電抵抗を流れる電流値が上記スイッチング素子の漏れ電流よりも大きくなるような抵抗値に設定されている請求項10に記載のDC/DC電力変換装置。
- 上記ダイオード又は上記スイッチング素子の少なくともいずれか一方は、ワイドバンドギャップ半導体によって形成されている請求項1から請求項11のいずれか1項に記載のDC/DC電力変換装置。
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JP2016063589A (ja) * | 2014-09-17 | 2016-04-25 | 富士電機株式会社 | 直流−直流変換装置 |
WO2019123716A1 (ja) * | 2017-12-18 | 2019-06-27 | 三菱電機株式会社 | 電力変換装置 |
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JP5379248B2 (ja) | 2013-12-25 |
DE112010005212B4 (de) | 2019-06-19 |
CN102771039B (zh) | 2015-07-29 |
US8604757B2 (en) | 2013-12-10 |
DE112010005212T5 (de) | 2012-11-15 |
US20130021011A1 (en) | 2013-01-24 |
JPWO2011092932A1 (ja) | 2013-05-30 |
CN102771039A (zh) | 2012-11-07 |
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