Switching power supply circuit, and method for control of switching power supply circuit

Patent metadata

Field	Value
Publication number	US-8994343-B2
Application number	US-201113579955-A
Country	US
Kind code	B2
Filing date	Mar 24, 2011
Priority date	Mar 26, 2010
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

A circuit includes a reactor, a diode, and a switching element. The reactor and the diode are connected in series with each other on a power supply line. The switching element is provided between a power supply line and a point between the reactor and the diode. A circuit includes a reactor, a diode, and a switching element. The reactor and the diode are connected in series with each other on a power supply line. The switching element is provided between the power supply line and a point between the reactor and the diode. Characteristics of at least any of the reactors, the switching elements, and the diodes are different from each other.

First claim

The invention claimed is:

1. A switching power supply circuit comprising:
first and second input terminals;
first and second output terminals;
a second power supply line connecting said second input terminal and said second output terminal to each other; and
a plurality of circuits, each of said plurality of circuits including:
a first power supply line connecting said first input terminal and said first output terminal to each other;
a reactor provided on said first power supply line;
a diode connected in series with said reactor on said first power supply line and arranged with an anode thereof directed toward said reactor; and
a switching element provided between said second power supply line and a point between said reactor and said diode; and

a controller adapted to perform a method for control of the switching power supply circuit when a DC voltage is applied between the first and second input terminals thereby causing a non-zero input current to flow in said first and second input terminals, the method comprising:
when the input current flowing in said first and second input terminals is less than a first predetermined value and more than zero, keeping said switching element belonging to each of said plurality of circuits non-conducting; and
when the input current flowing in said first and second input terminals exceeds the first predetermined value, repeatedly switching conducting/non-conducting of said switching element belonging to said one of said plurality of circuits,

wherein characteristics of said reactor of one of said plurality of circuits and said reactor of another of said plurality of circuits are different from each other, or characteristics of said switching element of said one of said plurality of circuits and said switching element of said another of said plurality of circuits are different from each other, or characteristics of said diode of said one of said plurality of circuits and said diode of said another of said plurality of circuits are different from each other.

2. The switching power supply circuit according to claim 1 , wherein
said switching element belonging to said one of said plurality of circuits is an insulated gate bipolar transistor, and said switching element belonging to said another of said plurality of circuits is a MOS field effect transistor.

3. The switching power supply circuit according to claim 2 , wherein
an impedance of said reactor belonging to said one of said plurality of circuits is lower than an impedance of said reactor belonging to said another of said plurality of circuits.

4. The switching power supply circuit according to claim 1 , wherein
said switching element belonging to said one of said plurality of circuits is formed of a silicon carbide semiconductor or a gallium nitride semiconductor, and said switching element belonging to said another of said plurality of circuits is formed of a silicon semiconductor.

5. The switching power supply circuit according to claim 3 , wherein
an impedance of said reactor belonging to said one of said plurality of circuits is lower than an impedance of said reactor belonging to said another of said plurality of circuits.

6. The switching power supply circuit according to claim 1 , wherein
an impedance of said reactor belonging to said one of said plurality of circuits is lower than an impedance of said reactor belonging to said another of said plurality of circuits.

7. A method for control of a switching power supply which comprises:
first and second input terminals;
first and second output terminals;
a second power supply line connecting said second input terminal and said second output terminal to each other; and
a plurality of circuits,
wherein
each of said plurality of circuits includes:
a first power supply line connecting said first input terminal and said first output terminal to each other;
a reactor provided on said first power supply line;
a diode connected in series with said reactor on said first power supply line and arranged with an anode thereof directed toward said reactor; and
a switching element provided between said second power supply line and a point between said reactor and said diode,

wherein characteristics of said reactor of one of said plurality of circuits and said reactor of another of said plurality of circuits are different from each other, or characteristics of said switching element of said one of said plurality of circuits and said switching element of said another of said plurality of circuits are different from each other, or characteristics of said diode of said one of said plurality of circuits and said diode of said another of said plurality of circuits are different from each other,
said method comprising performing:
a first step of, when the input current flowing in said first and second terminals is less than a first predetermined value and more than zero, keeping said switching element belonging to each of said plurality of circuits non-conducting; and
a second step of, when a current flowing in said first and second input terminals exceeds the first predetermined value, repeatedly switching conducting/non-conducting of said switching element belonging to said one of said plurality of circuits.

8. A method for control of a switching power supply circuit which comprises:
first and second input terminals;
first and second output terminals;
a second power supply line connecting said second input terminal and said second output terminal to each other; and
a plurality of circuits, each including:
a first power supply line connecting said first input terminal and said first output terminal to each other;
a reactor provided on said first power supply line;
a diode connected in series with said reactor on said first power supply line and arranged with an anode thereof directed toward said reactor; and
a switching element provided between said second power supply line and a point between said reactor and said diode,

wherein characteristics of said reactor of one of said plurality of circuits and said reactor of another of said plurality of circuits are different from each other, or characteristics of said switching element of said one of said plurality of circuits and said switching element of said another of said plurality of circuits are different from each other, or characteristics of said diode of said one of said plurality of circuits and said diode of said another of said plurality of circuits are different from each other,
said method comprising performing:
a first step of keeping said switching element belonging to each of said plurality of circuits non-conducting; and
a second step of, when a current flowing in said first and second input terminals exceeds a first predetermined value, repeatedly switching conducting/non-conducting of said switching element belonging to said one of said plurality of circuits,
wherein
in said second step, the conducting/non-conducting of said switching element belonging to said one of said plurality of circuits is repeatedly switched based on a first DC voltage command value that is higher than a voltage between said first and second output terminals in said first step.

9. The method for control of the switching power supply circuit according to claim 8 , further comprising performing
a third step of, when the current flowing in said first and second input terminals exceeds a second predetermined value that is higher than said first predetermined value, repeatedly switching conducting/non-conducting of said switching element of said one of said plurality of circuits and said switching element of said another of said plurality of circuits.

10. The method for control of the switc

Assignees

• Ohshita Kazuhiro
• Sakae Norio
• Yabuki Toshio
• Daikin Ind Ltd

Inventors

• Ohshita Kazuhiro
• Sakae Norio
• Yabuki Toshio

Classifications

• H02M3/155 Primary

  using semiconductor devices only · CPC title

• H02M3/1584 Primary

  with a plurality of power processing stages connected in parallel · CPC title

• Y02B70/16

  Cross-Sectional Technologies · mapped topic

• H02M2001/0032

  Electricity · mapped topic

• H02M1/42

  Circuits or arrangements for compensating for or adjusting power factor in converters or inverters · CPC title