WO-2026094545-A1 - POWER CONVERSION DEVICE AND PROGRAM FOR POWER CONVERSION DEVICE

WO2026094545A1WO 2026094545 A1WO2026094545 A1WO 2026094545A1WO-2026094545-A1

Abstract

A switch circuit (85) has a bidirectional switch. The switch circuit (85) is connected between a third output terminal (82A) of a second power conversion circuit (80) and a first end of a primary-side winding (41A). During execution of second control in which the second power conversion circuit (80) outputs power, a control unit (90) controls the switch circuit (85) so as to allow the flow of current from the second power conversion circuit (80) to the primary-side winding (41A). During execution of first control in which a first power conversion circuit (30) outputs power, the control unit (90) controls the switch circuit (85) so as to block the flow of current from the first power conversion circuit (30) to the second power conversion circuit (80).

Inventors

BHAGAT Chinmay
ISHIKURA YUKI

Assignees

株式会社村田製作所

Dates

Publication Date: 20260507
Application Date: 20251003
Priority Date: 20241031

Claims (5)

A power conversion circuit having multiple input terminals, a first output terminal and a second output terminal, which can convert three-phase AC power input to the input terminals and output it from the first output terminal and the second output terminal, A transformer having a primary winding and a secondary winding, wherein the first end of the primary winding is connected to the first output terminal and the second end of the primary winding is connected to the second output terminal, An output circuit having a switch element, a third output terminal connected between the first output terminal and the first end of the primary winding, and a fourth output terminal connected between the second output terminal and the second end of the primary winding, and capable of outputting power from the third output terminal and the fourth output terminal, A switch circuit having a bidirectional switch, connected between the third output terminal and the first end of the primary winding, or between the fourth output terminal and the second end of the primary winding, A control unit that controls the power conversion circuit, the output circuit, and the switch circuit, Equipped with, The control unit, While the power conversion circuit is performing the first control, which outputs power from the first output terminal and the second output terminal, the switch circuit is controlled to interrupt the flow of current from the power conversion circuit to the output circuit. A power converter that controls the switch circuit to allow current to flow from the output circuit to the primary winding while the output circuit is performing a second control in which it outputs power from the third output terminal and the fourth output terminal.
The control unit, The power conversion device according to claim 1, wherein when switching from the second control to the first control, the switch circuit is controlled to interrupt the flow of current from the power conversion circuit to the output circuit before switching to the first control.
When the aforementioned power conversion circuit is designated as the first power conversion circuit, The power conversion device according to claim 1 or 2, wherein the output circuit is a second power conversion circuit having a plurality of the switch elements and a capacitor, and capable of outputting the energy stored in the capacitor to the third output terminal and the fourth output terminal.
The system includes a boost circuit that increases the input DC voltage and outputs it to the second power conversion circuit. The power conversion device according to claim 3, wherein the output voltage of the boost circuit is greater than the maximum value of the input voltage input to the input terminal.
A power conversion circuit having multiple input terminals, a first output terminal and a second output terminal, which can convert three-phase AC power input to the input terminals and output it from the first output terminal and the second output terminal, A transformer having a primary winding and a secondary winding, wherein the first end of the primary winding is connected to the first output terminal and the second end of the primary winding is connected to the second output terminal, An output circuit having a switch element, a third output terminal connected between the first output terminal and the first end of the primary winding, and a fourth output terminal connected between the second output terminal and the second end of the primary winding, and capable of outputting power from the third output terminal and the fourth output terminal, A switch circuit having a bidirectional switch, connected between the third output terminal and the first end of the primary winding, or between the fourth output terminal and the second end of the primary winding, A control unit that controls the power conversion circuit, the output circuit, and the switch circuit, Applicable to power converters equipped with, The control unit, During the execution of the first control in which the power conversion circuit outputs power from the first output terminal and the second output terminal, the process of controlling the switch circuit to interrupt the flow of current from the power conversion circuit to the output circuit, During the execution of the second control in which the output circuit outputs power from the third output terminal and the fourth output terminal, the process of controlling the switch circuit to allow current to flow from the output circuit to the primary winding, A program for a power converter that executes the following.

Description

Power converter and program for power converter This disclosure relates to a power converter and a program for a power converter. The power conversion device disclosed in Patent Document 1 comprises a matrix converter having six bidirectional switches, a transformer having two coils, and a control device that controls the on/off state of each bidirectional switch. The control device switches the on/off state of each bidirectional switch according to a predetermined sequence, thereby converting the input three-phase AC power into DC power and outputting it to the primary coil of the transformer. Furthermore, the power conversion device disclosed in Patent Document 1 includes a protection circuit. The protection circuit is connected between the matrix converter and the transformer. The protection circuit and the matrix converter are connected in parallel to the transformer. Figure 1 is a circuit diagram of a power converter.Figure 2 is a circuit diagram of the first power conversion circuit.Figure 3 is a circuit diagram of the second power conversion circuit and the switch circuit.Figure 4 is a circuit diagram showing an example of the on/off states of the switch element in the first power conversion circuit.Figure 5 is an equivalent circuit diagram of the parasitic capacitance of a power converter assuming there is no switch circuit.Figure 6 is an equivalent circuit diagram for the parasitic capacitance of a power converter. <Embodiments of a power converter and a program for a power converter> Embodiments of a power converter and a program for a power converter are described below. The drawings are merely illustrative of the embodiments of this disclosure and should not be considered limiting. Furthermore, the drawings are schematic diagrams for ease of understanding and may enlarge or omit components. Terms such as "first,""second," and "third" in this disclosure are used solely to distinguish objects and do not imply any ranking or ranking. (Regarding the configuration of the power converter) As shown in Figure 1, the power converter 10 includes an input-side low-pass filter 20, a first power conversion circuit 30, a transformer circuit 40, and a rectifier circuit 50. The power converter 10 also includes a first external input terminal 11A, a second external input terminal 11B, and a third external input terminal 11C, as well as a first external output terminal 12A and a second external output terminal 12B. The power converter 10 is, as a whole, a so-called three-phase isolated AC-DC converter. That is, the power converter 10 converts the three-phase AC power input to each external input terminal into DC power, which can then be output from a pair of external output terminals. Furthermore, a transformer circuit 40 is interposed in the power path from each external input terminal to each external output terminal, thereby electrically isolating the external input terminal side from the external output terminal side. For example, each external input terminal receives the three phases of three-phase AC power input from the three-phase AC power supply 100. The three-phase AC power supply 100 is a three-phase, three-wire commercial power system with three AC power supplies connected in a Y-connection. The voltages of the three phases are the first voltage VA, the second voltage VB, and the third voltage VC. Each voltage is an AC voltage with a different phase from the others. The first voltage VA is input to the first external input terminal 11A. The second voltage VB is input to the second external input terminal 11B. The third voltage VC is input to the third external input terminal 11C. The second voltage VB has a phase difference of 120° from the first voltage VA. The third voltage VC has a phase difference of 120° from the second voltage VB. Note that this "120° phase difference" allows for an error of approximately ±1°. The pair of external output terminals are a first external output terminal 12A and a second external output terminal 12B. Any load 110 can be connected between the first external output terminal 12A and the second external output terminal 12B. The load 110 is, for example, an electronic device such as a server driven by DC power. The input-side low-pass filter 20 comprises a first inductor L1, a second inductor L2, and a third inductor L3. Furthermore, the input-side low-pass filter 20 also comprises a first capacitor C1, a second capacitor C2, and a third capacitor C3. The first terminal of the first inductor L1 is connected to the first external input terminal 11A. The first terminal of the first capacitor C1 is connected to the second terminal of the first inductor L1. The first end of the second inductor L2 is connected to the second external input terminal 11B. The first end of the second capacitor C2 is connected to the second end of the second inductor L2. The second end of the second capacitor C2 is connected to the second end of the first capacitor C1. The first terminal of the th