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CN-117203885-B - Power conversion device and power conversion system

CN117203885BCN 117203885 BCN117203885 BCN 117203885BCN-117203885-B

Abstract

The power conversion device of the present invention includes a first power terminal, a first rod, a second rod, a first inductor, a second inductor, a first capacitor, a first transformer, a rectifier circuit, a second power terminal, and a control circuit. The first rod member has a first switching element between the first connection terminal and the first node, a second switching element between the first node and the second node, and a third switching element between the second node and the second connection terminal. The second rod has a fourth switching element between the first connection terminal and the third node, a fifth switching element between the third node and the fourth node, and a sixth switching element between the fourth node and the second connection terminal. The first inductor is between the second node and the fifth node, and the second inductor is between the fourth node and the fifth node. The first capacitor is between the fifth node and the second connection terminal. The first transformer has a first winding and a second winding disposed on a path connecting the first node and the third node.

Inventors

  • Ishizuki Naoyuki

Assignees

  • TDK株式会社

Dates

Publication Date
20260512
Application Date
20210330

Claims (12)

  1. 1. A power conversion device is provided with: A first power terminal having a first connection terminal and a second connection terminal; a first lever provided on a first path connecting the first connection terminal and the second connection terminal, and having a first switching element provided between the first connection terminal and a first node, a second switching element provided between the first node and a second node, and a third switching element provided between the second node and the second connection terminal; a second lever disposed on a second path connecting the first and second connection terminals and having a fourth switching element disposed between the first connection terminal and a third node, a fifth switching element disposed between the third node and a fourth node, and a sixth switching element disposed between the fourth node and the second connection terminal; a first inductor disposed between the second node and a fifth node; A second inductor disposed between the fourth node and the fifth node; a first capacitor disposed between the fifth node and the second connection terminal; a first transformer having a first winding and a second winding, the first winding being disposed on a path connecting the first node and the third node; A rectifier circuit having a plurality of rectifier elements connected to the second winding; a second power terminal connected to the rectifying circuit and having a third connection terminal and a fourth connection terminal, and And the control circuit is used for controlling the switching action of the first rod piece and the second rod piece according to the voltage of the second power terminal.
  2. 2. The power conversion device according to claim 1, wherein, Further provided with a resonant inductor and a resonant capacitor, The resonant inductor and the resonant capacitor are disposed on the path connecting the first node and the third node.
  3. 3. The power conversion apparatus according to claim 1 or claim 2, wherein, A second transformer is provided, which is provided with a second transformer, The second transformer has a first winding and a second winding, The first winding of the second transformer comprises the first inductor, The second winding of the second transformer includes the second inductor.
  4. 4. The power conversion apparatus according to any one of claim 1 to claim 3, wherein, The control circuit controls the switching action according to the voltage of the second power terminal to change the first on-duty ratio of the first switching element, the second switching element, the fourth switching element and the fifth switching element, and maintain the second on-duty ratio of the third switching element and the sixth switching element.
  5. 5. The power conversion device according to claim 4, wherein, The control circuit turns on the third switching element in a first period, turns on the sixth switching element in a second period other than the first period, and changes the first on duty by changing switching timings of the first switching element and the second switching element in the first period and switching timings of the fourth switching element and the fifth switching element in the second period.
  6. 6. The power conversion apparatus according to any one of claim 1 to claim 5, wherein, The control circuit sets the third switching element to an on state at a time when a predetermined time elapses from a time when the first switching element is set to an off state during the period when the second switching element is set to the on state, sets the first switching element to the on state at a time when a predetermined time elapses from a time when the second switching element is set to the off state during the period when the third switching element is set to the on state, and sets the second switching element to the on state at a time when a predetermined time elapses from a time when the third switching element is set to the off state during the period when the first switching element is set to the on state.
  7. 7. A power conversion device is provided with: A first power terminal having a first connection terminal and a second connection terminal; A lever provided on a path connecting the first connection terminal and the second connection terminal, and having a first switching element provided between the first connection terminal and a first node, a second switching element provided between the first node and a second node, and a third switching element provided between the second node and the second connection terminal; an inductor disposed between the second node and a third node; a first capacitor disposed between the third node and the second connection terminal; a second capacitor disposed between the first connection terminal and a fourth node; a third capacitor disposed between the fourth node and the second connection terminal; A transformer having a first winding and a second winding, the first winding being disposed on a path connecting the first node and the fourth node; A rectifier circuit having a plurality of rectifier elements connected to the second winding; a second power terminal connected to the rectifying circuit and having a third connection terminal and a fourth connection terminal, and And the control circuit is used for controlling the switching action of the rod piece according to the voltage of the second power terminal.
  8. 8. The power conversion device according to claim 7, wherein, Further provided with a resonant inductor and a resonant capacitor, The resonant inductor and the resonant capacitor are disposed on the path connecting the first node and the fourth node.
  9. 9. The power conversion apparatus according to claim 7 or claim 8, wherein, The control circuit controls the switching action according to the voltage of the second power terminal to change the first on-duty ratio of the first switching element and the second switching element and maintain the second on-duty ratio of the third switching element.
  10. 10. The power conversion device according to claim 9, wherein, The control circuit turns on the third switching element during a first period, and changes the first on-duty by changing switching timings of the first switching element and the second switching element during the first period.
  11. 11. The power conversion apparatus according to any one of claim 7 to claim 10, wherein, The control circuit sets the second switching element to an on state at a time when a predetermined time elapses from a time when the third switching element is set to an off state during the first switching element is in the on state, sets the third switching element to an on state at a time when a predetermined time elapses from a time when the first switching element is set to an off state during the second switching element is in the on state, and sets the first switching element to an on state at a time when a predetermined time elapses from a time when the second switching element is set to an off state during the third switching element is in the on state.
  12. 12. A power conversion system is provided with: The power conversion apparatus according to any one of claims 1 to 11, and And a dc power supply device connected to the first power terminal of the power conversion device.

Description

Power conversion device and power conversion system Technical Field The present invention relates to a power conversion device and a power conversion system that convert electric power. Background The power conversion device converts electric power by stepping up or stepping down an input voltage. In patent document 1, there is disclosed a power conversion device having a transformer and a bar (arm) including 3 transistors provided on a primary side of the transformer, boosting an input voltage, and transforming the boosted voltage. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2019-187021 Disclosure of Invention In a power conversion device, it is desirable to be able to operate according to various input voltages, and to realize a wide input voltage range. It is desirable to provide a power conversion device and a power conversion system capable of widening the input voltage range. The first power conversion device according to one embodiment of the present invention includes a first power terminal, a first rod, a second rod, a first inductor, a second inductor, a first capacitor, a first transformer, a rectifier circuit, a second power terminal, and a control circuit. The first power terminal is configured to have a first connection terminal and a second connection terminal. The first rod is arranged on a first path connecting the first wiring terminal and the second wiring terminal and is provided with a first switching element, a second switching element and a third switching element, wherein the first switching element is arranged between the first wiring terminal and the first node, the second switching element is arranged between the first node and the second node, and the third switching element is arranged between the second node and the second wiring terminal. The second rod is arranged on a second path connecting the first connecting terminal and the second connecting terminal and is provided with a fourth switching element, a fifth switching element and a sixth switching element, wherein the fourth switching element is arranged between the first connecting terminal and the third node, the fifth switching element is arranged between the third node and the fourth node, and the sixth switching element is arranged between the fourth node and the second connecting terminal. The first inductor is disposed between the second node and the fifth node. The second inductor is disposed between the fourth node and the fifth node. The first capacitor is disposed between the fifth node and the second connection terminal. The first transformer has a first winding and a second winding, the first winding being disposed on a path connecting the first node and the third node. The rectifying circuit has a plurality of rectifying elements connected to the second winding. The second power terminal is connected to the rectifying circuit and has a third connection terminal and a fourth connection terminal. The control circuit is configured to control switching operation of the first lever and the second lever according to the voltage of the second power terminal. The second power conversion device according to one embodiment of the present invention includes a first power terminal, a rod, an inductor, a first capacitor, a second capacitor, a third capacitor, a transformer, a rectifier circuit, a second power terminal, and a control circuit. The first power terminal is configured to have a first connection terminal and a second connection terminal. The lever is disposed on a path connecting the first connection terminal and the second connection terminal, and has a first switching element disposed between the first connection terminal and the first node, a second switching element disposed between the first node and the second node, and a third switching element disposed between the second node and the second connection terminal. The inductor is disposed between the second node and the third node. The first capacitor is disposed between the third node and the second connection terminal. The second capacitor is disposed between the first connection terminal and the fourth node. The third capacitor is disposed between the fourth node and the second connection terminal. The transformer has a first winding and a second winding, the first winding being disposed on a path connecting the first node and the fourth node. The rectifying circuit has a plurality of rectifying elements connected to the second winding. The second power terminal is connected to the rectifying circuit and has a third connection terminal and a fourth connection terminal. The control circuit is configured to control the switching operation of the lever according to the voltage of the second power terminal. The power conversion system according to one embodiment of the present invention includes a power conversion device and a dc power supply device. The power conversion device is the first power conver