Provided is a power converter that is capable of ensuring a conduction current without expanding the configuration of a DC voltage conversion circuit such as a DC chopper. Power can be supplied from both a DC chopper and a voltage source rectifier converting AC power into DC power, to a voltage sour
Provided is a power converter that is capable of ensuring a conduction current without expanding the configuration of a DC voltage conversion circuit such as a DC chopper. Power can be supplied from both a DC chopper and a voltage source rectifier converting AC power into DC power, to a voltage source inverter. The voltage source rectifier has an upper arm part and a lower arm part having switching elements. The voltage source rectifier converts AC power obtained from an alternator into DC power, performs a DC chopper operation using the upper and lower arms thereof and a winding wire of the alternator, and supplies power of a DC power source to the voltage source inverter.
대표청구항▼
1. A power converter, comprising: a voltage source rectifier converting AC power obtained from an AC power source into a DC power output;a DC power source;a DC voltage conversion circuit converting a DC voltage obtained from the DC power source into a different DC voltage and outputting a correspond
1. A power converter, comprising: a voltage source rectifier converting AC power obtained from an AC power source into a DC power output;a DC power source;a DC voltage conversion circuit converting a DC voltage obtained from the DC power source into a different DC voltage and outputting a corresponding DC power; anda load driving circuit converting at least either the DC power output of the voltage source rectifier or the DC power output of the DC voltage conversion circuit into AC power to drive an AC load,wherein the DC power source is connected to the DC voltage conversion circuit to convert a voltage of the DC power source and supply a resultant voltage to the load driving circuit,and wherein the DC power source is connected to the voltage source rectifier via a DC power supply circuit and inductance elements, and the voltage source rectifier is controlled as a DC chopper, to convert the voltage of the DC power source and supply a resultant voltage to the load driving circuit. 2. The power converter according to claim 1, wherein the AC power source is configured by an alternator, and the inductance elements are each configured by a winding wire of the alternator. 3. The power converter according to claim 2, wherein the DC power supply circuit has a configuration in which the DC power source and a neutral point of the winding wire of the alternator are connected by a switch circuit. 4. The power converter according to claim 3, wherein the switch circuit is controlled to be turned on when the alternator is in a stopped state thereof and the voltage source rectifier is controlled as the DC chopper. 5. The power converter according to claim 4, wherein the DC power supply circuit has an auxiliary inductance element inserted thereto in series with the switch circuit. 6. The power converter according to claim 2, wherein the DC power supply circuit has a second DC power source that is different from the DC power source and is connected in series with the switch circuit. 7. The power converter according to claim 1, wherein a switch circuit is provided to connect each of phases of AC input parts of the voltage source rectifier to the AC power source,and wherein one end of the DC power supply circuit is connected between the switch circuit and each of the phases of the AC input parts of the voltage source rectifier, while another end of the DC power supply circuit is connected to the DC power source by the inductance elements. 8. The power converter according to claim 7, wherein the DC power supply circuit has another switch circuit that is connected to each of the phases of the AC input parts of the voltage source rectifier and connected in series with the inductance elements. 9. The power converter according to claim 8, wherein the switch circuit is turned off to disconnect the voltage source rectifier from the AC power source, and the other switch circuit is turned on to connect the DC power source between the switch circuit and each of the phases of the AC input parts of the voltage source rectifier by each inductance element,and wherein the voltage source rectifier is controlled as the DC chopper to convert the voltage of the DC power source and supply the resultant voltage to the load driving circuit. 10. The power converter according to claim 8, wherein the inductance elements are connected in series with the other switch circuit. 11. The power converter according to claim 8, wherein the inductance elements are connected individually in series with the other switch circuit. 12. The power converter according to claim 8, wherein the DC power supply circuit has a second DC power source that is different from the DC power source and is connected in series with the other switch circuit. 13. The power converter according to claim 1, wherein a switch circuit is provided to connect each of phases of AC input parts of the voltage source rectifier to the AC power source,and wherein the DC power supply circuit is connected between each of the phases of the AC input parts of the voltage source rectifier and a serial connection point between switching elements configuring the DC voltage conversion circuit. 14. The power converter according to claim 13, wherein the DC power supply circuit has a configuration in which each of the phases of the AC input parts of the voltage source rectifier is connected to the serial connection point between the switching elements configuring the DC voltage conversion circuit, by another switch circuit. 15. The power converter according to claim 1, wherein the load is an AC motor, and the load drive device is a voltage source inverter. 16. An apparatus comprising: a rectifying device configured to convert an AC power input into a first DC power output;a DC voltage conversion device configured to convert a DC voltage input into a second DC power output; anda load driving device configured to convert at least one of the first DC power output or the second DC power output into an AC power output;wherein the rectifying device is operable as a DC chopper. 17. The apparatus of claim 16, further comprising an AC power source configured to supply the AC power input and a DC power supply configured to supply the DC voltage input. 18. The apparatus of claim 17, further comprising a control device configured to output at least a first control signal to cause the rectifying device to operate as a rectifier that converts the AC power input into the first DC power output, and at least a second control signal to cause the rectifying device to operate as a step-up DC chopper. 19. The apparatus of claim 18, wherein the rectifying device is configured to, while operating as the step-up DC chopper, supplement a charging operation of the DC voltage conversion device to charge the DC power supply. 20. The apparatus of claim 19, further comprising a DC power supply path comprising a switch, controlled by the control device, connected between the AC power source and the DC power source, and an inductance element connected between the DC power source and the DC voltage conversion device.
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