Magnetic component, power converter and power supply system

Patent metadata

Field	Value
Publication number	US-9647544-B2
Application number	US-201314382397-A
Country	US
Kind code	B2
Filing date	Mar 18, 2013
Priority date	Mar 19, 2012
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A magnetic component has a core on which windings are wound. The windings are electrically connected in series to constitute a coil of a first reactor. The winding constitutes a coil of a second reactor. The core has a leg portion on which the winding is wound, a leg portion on which the winding is wound, and a leg portion on which the winding is wound. When a current flows through the windings, magnetic fluxes produced from the windings, respectively, and flowing through the winding counteract each other. Furthermore, when a current flows through the winding, induced voltages produced from the windings, respectively, by the magnetic flux produced by the winding counteract each other.

First claim

The invention claimed is:

1. A power converter comprising:
first and second reactors configured by a magnetic component electrically connected between a DC power source and a load;
a plurality of switching elements arranged between said DC power source and said load such that a first current flowing through said first reactor and a second current flowing through said second reactor are controlled independently; and
a control device configured to control on/off of said plurality of switching elements so as to control an output voltage on a power line connected to said load,
said magnetic component including:
first and second windings connected in series and forming said first reactor; and
a third winding forming second reactor; and
a core configured to include a first section on which said first winding is wound, a second section on which said second winding is wound, and a third section on which said third winding is wound,

said first to third windings being wound on said first to third sections, respectively, such that, in a state where magnetic saturation does not occur in said core, a magnetic flux produced from said first winding and flowing through said third winding and a magnetic flux produced from said second winding and flowing through said third winding counteract each other, when said first current flows through said first and second windings, and induced voltages produced in said first and second windings, respectively, by a magnetic flux produced from said third winding counteract each other, when said second current flows through said third winding, and
said control device controlling a phase difference between a first carrier signal used for first pulse width modulation control for controlling power conversion in a first power conversion path through which said first current flows and a second carrier signal used for second pulse width modulation control for controlling power conversion in a second power conversion path through which said second current flows such that any critical point of one of said first and second currents coincides with any critical point of the other one of said first and second currents in phase, and then generates signals for controlling on/off of said plurality of switching elements in accordance with said first and second pulse width modulation control.

2. The power converter according to claim 1 , wherein
in said core on which said first to third windings are wound, in a state where magnetic saturation does not occur in said core, a magnetic resistance of a first magnetic circuit passing through said first section and a magnetic resistance of a second magnetic circuit passing through said second section are equivalent, when said second current flows through said third winding, and
said first and second windings have winding directions opposite to each other.

3. The power converter according to claim 1 , wherein
said control device controls said phase difference between said first carrier signal and said second carrier signal, when both said first and second currents flow in positive or negative direction, such that a relative maximum point of one of said first and second currents and a relative minimum point of the other of said first and second currents agree in phase.

4. A power supply system comprising:
a first DC power source;
a second DC power source; and
the power converter as defined in claim 1 ,
said power converter being configured to execute DC power conversion between a power line electrically connected to the load and said first and second DC power sources,
said plurality of switching elements including:
a first switching element electrically connected between a first node and said power line;
a second switching element electrically connected between a second node and said first node;
a third switching element electrically connected between a third node electrically connected to a negative terminal of said second DC power source and said second node; and
a fourth switching element electrically connected between a negative terminal of said first DC power source and said third node,

said first reactor being electrically connected between a positive terminal of said first DC power source and said second node, and
said second reactor being electrically connected between the positive terminal of said second DC power source and said first node.

5. The power supply system according to claim 4 , wherein
in said core on which said first to third windings are wound, in the state where magnetic saturation does not occur in said core, a magnetic resistance of a first magnetic circuit passing through said first section and a magnetic resistance of a second magnetic circuit passing through said second section are equivalent, when said second current flows through said third winding, and
said first and second windings have winding directions opposite to each other.

6. The power supply system according to claim 4 , wherein said power converter is configured to be switchable, by controlling said plurality of switching elements, between a first operation mode in which said DC power conversion is executed with said first and second DC power sources electrically connected in series with said power line and a second operation mode in which said first and second DC power sources execute said DC power conversion to said power line in parallel.

7. The power supply system according to claim 4 , wherein
said control device controls said phase difference between said first carrier signal and said second carrier signal, when both said first and second DC power sources are in a power running or regenerating state, such that a relative maximum point of one of said first and second currents and a relative minimum point of the other of said first and second currents agree in phases.

8. The power supply system according to claim 4 , wherein said phase difference is controlled such that one of a rising edge and a falling edge of a first control pulse signal obtained by said first pulse width modulation control coincides with the other one of a rising edge and a falling edge of a second control pulse signal obtained by said second pulse width modulation control.

Assignees

• Toyota Chuo Kenkyusho Kk
• Toyota Motor Co Ltd

Inventors

• Ishigaki Masanori
• Tomura Shuji
• Umeno Takaji
• Okamura Masaki
• Nobe Daigo

Classifications

• H01F27/38 Primary

  Auxiliary core members; Auxiliary coils or windings · CPC title

• H01F2038/026

  non-linear inductive arrangements for converters, e.g. with additional windings · CPC title

• H01F38/023

  of inductances · CPC title

• H01F37/00

  Fixed inductances not covered by group H01F17/00 · CPC title

• Y10T307/50

  Cross-Sectional Technologies · mapped topic