AC-DC power supply and motor

Patent metadata

Field	Value
Publication number	US-11271489-B2
Application number	US-201716344370-A
Country	US
Kind code	B2
Filing date	Nov 9, 2017
Priority date	Nov 14, 2016
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

An alternating-current (AC)—direct-current (DC) power supply includes a circuit board including an alternating-current input terminal to which an alternating current is input and a direct-current output terminal from which a direct current is output. The AC-DC power supply includes a diode bridge that rectifies the alternating current input via the alternating-current input terminal, an alternating-current input line that electrically connects the alternating-current input terminal and the diode bridge, a coil connected to the diode bridge, a diode connected to the direct-current output terminal, a switching line that electrically connects the coil and the diode, and a switching element connected to the switching line. A portion of the switching line is disposed at right angles to a portion of the alternating-current input line.

First claim

The invention claimed is:

1. An alternating-current (AC)—direct-current (DC) power supply comprising:
a circuit board including:
an alternating-current input terminal to which an alternating current is input; and
a direct-current output terminal from which a direct current is output;

a diode bridge that rectifies the alternating current input via the alternating-current input terminal;
an alternating-current input line that electrically connects the alternating-current input terminal and the diode bridge;
a coil connected to the diode bridge;
a diode connected to the direct-current output terminal;
a switching line that electrically connects the coil and the diode; and
a switching element connected to the switching line; wherein
a portion of the switching line is disposed at right angles to a portion of the alternating-current input line;
the switching line includes a coil adjacent portion adjacent to the coil;
the alternating-current input line includes an alternating-current-input-terminal adjacent portion adjacent to the alternating-current input terminal;
the coil adjacent portion is disposed at right angles to the alternating-current-input-terminal adjacent portion;
the alternating-current input line includes a diode-bridge adjacent portion adjacent to the diode bridge;
the diode-bridge adjacent portion is parallel to the coil adjacent portion; and
the diode-bridge adjacent portion is shorter than the alternating-current-input-terminal adjacent portion.

2. The AC-DC power supply according to claim 1 , wherein the diode bridge is disposed between the alternating-current-input-terminal adjacent portion and the switching element.

3. The AC-DC power supply according to claim 1 , further comprising:
an electromagnetic-compatibility (EMC) countermeasure member; wherein
the EMC countermeasure member is disposed in the alternating-current input line; and
the alternating-current-input-terminal adjacent portion connects the alternating-current input terminal and the EMC countermeasure member.

4. The AC-DC power supply according to claim 1 , wherein the coil is disposed between the alternating-current-input-terminal adjacent portion and the switching element.

5. The AC-DC power supply according to claim 4 , wherein
a first direction in which the coil adjacent portion extends is perpendicular to a second direction in which the alternating-current-input-terminal adjacent portion extends; and
a distance between the coil and the switching element in the first direction is larger than a distance between the switching element and the diode in the second direction.

6. The AC-DC power supply according to claim 1 , further comprising:
a direct-current output line that electrically connects the direct-current output terminal and the diode; wherein
the direct-current output line is disposed at right angles to the alternating-current-input-terminal adjacent portion.

7. The AC-DC power supply according to claim 1 , wherein
the circuit board is rectangular;
the alternating-current input terminal is disposed on a first side of the circuit board; and
the direct-current output terminal is disposed on a second side that is opposite the first side.

8. The AC-DC power supply according to claim 1 , wherein the switching element is a gallium nitride field-effect transistor.

9. The AC-DC power supply according to claim 1 , further comprising:
a gate driver that drives the switching element; and
a DC-DC converter that supplies power to the gate driver; wherein
the DC-DC converter is disposed at right angles to the circuit board.

10. A motor comprising the AC-DC power supply according to claim 1 .

Assignees

• Nidec Corp

Inventors

• Sun Xiaoxia
• Kitakawa Haruki
• Togawa Takashi

Classifications

• H02M1/4225

  using a non-isolated boost converter · CPC title

• H02M7/003 Primary

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title

• H02M1/4208

  Arrangements for improving power factor of AC input · CPC title

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• Y02B70/10

  Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes · CPC title