Power conversion device

Patent metadata

Field	Value
Publication number	US-2016204707-A1
Application number	US-201414917082-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Oct 23, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

A power conversion device that distributes input power to multiple outputs in accordance with power requirement of a load, using a plurality of magnetically coupled windings. In the case of supplying power from an AC power supply, at least one of an AC/DC converter and first to fourth switching circuits controls voltage on an output side of the AC/DC converter, based on a deviation between a detected value and a target value of the voltage. In the case of supplying power from a first DC voltage source or a second DC voltage source, the second switching circuit or the fourth switching circuit provided between the first DC voltage source or the second DC voltage source and the transformer supplies power based on an arbitrary time ratio.

First claim

1 . A power conversion device comprising:
a transformer composed of three or more windings magnetically coupled with each other, the windings including a first winding; a first switching circuit connected to the first winding; an AC/DC converter having a DC side connected to an input part of the first switching circuit, and converting input power from an AC power supply to DC; a voltage detector for detecting DC side voltage of the AC/DC converter; and a switching circuit and a load which are connected to the other one or more of the windings besides the first winding, wherein the first switching circuit supplies AC power to the first winding at a predetermined time ratio, and at least one of the switching circuit on a load side connected via the transformer controls voltage on an output side of the AC/DC converter, based on both a detected voltage value detected by the voltage detector and a target voltage value.

2 . The power conversion device according to claim 1 , wherein
the transformer is composed of the first winding, a second winding, a third winding, and a fourth winding magnetically coupled with each other, the first switching circuit is connected to the first winding, a second switching circuit is connected between the second winding and a first DC voltage source, a third switching circuit is connected between the third winding and an inverter, a fourth switching circuit is connected between the fourth winding and a second DC voltage source, the first switching circuit is connected to a DC output end of the AC/DC converter connected to the AC power supply, a first detector for detecting DC side voltage of the AC/DC converter, a second detector for detecting a voltage or current value of the first DC voltage source, a third detector for detecting DC side voltage of the third switching circuit, a fourth detector for detecting a voltage or current value of the second DC voltage source, and in the case where the first DC voltage source, the second DC voltage source, and a device connected to the inverter are considered to be the load, the first switching circuit supplies AC power to the first winding at a predetermined time ratio, and at least one of the second to fourth switching circuits controls the voltage on the output side of the AC/DC converter, based on both a detected voltage value detected by the first detector and a target voltage value, and other switching circuits of the second to fourth switching circuits respectively control the voltage or current on the load side, based on both an each detected value detected by the second to fourth detectors that are connected to the other switching circuits and an each target value.

3 . The power conversion device according to claim 1 , wherein
the transformer is composed of the first winding, a second winding, and a fourth winding magnetically coupled with each other, the first switching circuit is connected to the first winding, a second switching circuit is connected between the second winding and a first DC voltage source, a fourth switching circuit is connected between the fourth winding and a second DC voltage source, the first switching circuit and an inverter are connected in parallel to an output end of the AC/DC converter connected to the AC power supply, a first detector for detecting DC side voltage of the AC/DC converter, a second detector for detecting a voltage or current value of the first DC voltage source, a fourth detector for detecting a voltage or current value of the second DC voltage source, and in the case where the first DC voltage source, the second DC voltage source, and a device connected to the inverter are considered to be the load, the first switching circuit supplies AC power to the first winding at a predetermined time ratio, one of the second and the fourth switching circuits controls the voltage on the output side of the AC/DC converter, based on both a detected voltage value detected by the first detector and a target voltage value, and the other of the second and the fourth switching circuits controls the voltage or current on the load side, based on both a detected value detected by the second or the fourth detector that is connected to the other of the second and the fourth switching circuits and an each target value.

4 . The power conversion device according to claim 1 , wherein
the transformer is composed of the first winding, a second winding, and a third winding magnetically coupled with each other, the first switching circuit is connected to the first winding, a second switching circuit is connected between the second winding and a first DC voltage source, a third switching circuit is connected between the third winding and an inverter, the first switching circuit is connected to an output end of the AC/DC converter connected to the AC power supply, a first detector for detecting DC side voltage of the AC/DC converter, a second detector for detecting a voltage or current value of the first DC voltage source, a third detector for detecting DC side voltage of the third switching circuit, and in the case where the first DC voltage source and a device connected to the inverter are considered to be the load, the first switching circuit supplies AC power to the first winding at a predetermined time ratio, one of the second and the third switching circuits controls the voltage on the output side of the AC/DC converter, based on both a detected voltage value detected by the first detector and a target voltage value, and the other of the second and the third switching circuits controls the voltage or current on the load side, based on both a detected value detected by the second or the third detectors that is connected to the other of the second and the third switching circuits and an each target value.

5 . The power conversion device according to claim 1 , wherein
the transformer is composed of the first winding, a second winding, and a fourth winding magnetically coupled with each other, the first switching circuit is connected to the first winding, a second switching circuit is connected between the second winding and a first DC voltage source, a fourth switching circuit is connected between the fourth winding and a second DC voltage source, the first switching circuit is connected to an output end of the AC/DC converter connected to the AC power supply, a first detector for detecting DC side voltage of the AC/DC converter, a second detector for detecting a voltage or current value of the first DC voltage source, a fourth detector for detecting a voltage or current value of the second DC voltage source, and in the case where the first DC voltage source and the second DC voltage source are considered to be the load, the first switching circuit supplies AC power to the first winding at a predetermined time ratio, one of the second and the fourth switching circuits controls the voltage on the output side of the AC/DC converter, based on both a detected voltage value detected by the first detector and a target voltage value, and the other of the second and the fourth switching circuits controls the voltage or current on the load side, based on both a detected value detected by the second or the fourth detector that is connected to the other of the second and the fourth switching circuits and a target value.

6 . (canceled)

7 . The power conversion device according to claim 1 , wherein, in a state in which the AC/DC converter rectifies the input power from the AC power supply and the first switching circuit supplies power to the transformer,
the AC/DC converter performs control based on a constant target value for an AC current effective value so as to receive constant power from the AC power supply, one of the switching circuits

Assignees

• Mitsubishi Electric Corp

Inventors

• Takahara Takaaki
• Murakami Satoshi
• Kondo Ryota
• Yamada Masaki

Classifications

• H02M2001/0009

  Electricity · mapped topic

• H02M3/33546 Primary

  with automatic control of the output voltage or current (H02M3/33561 takes precedence) · CPC title

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M7/04

  by static converters · CPC title

• H02M3/33573

  Full-bridge at primary side of an isolation transformer · CPC title