Power supply control device for controlling power supply connected to motor

• US 8,288,974 B2
• Filed: 04/29/2010
• Issued: 10/16/2012
• Est. Priority Date: 05/08/2009
• Status: Active Grant

• Current Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Inventors: Aoki, Mikiyuki, Furukawa, Kunio
• Primary Examiner(s): Leykin, Rita
• Application Number:
  US12/770,219
• Publication Number:
  US 20100284673A1
• Time in Patent Office: 901 Days
• Field of Search: 318/376, 318/375, 363/63, 363/55, 323/282, 388/821, 388/816
• US Class Current: 318/376
• CPC Class Codes: H02P 7/281 the DC motor being operated in four quadrants

Abstract

A power supply control device controls a power supply connected to a motor and includes: an AC/DC converter that makes a first DC power supply; a DC/DC converter that makes a second DC power supply out of the first DC power supply; a first rectifying element that allows current to flow from the first DC power supply toward the motor; a second rectifying element that allows current to flow from the first DC power supply toward the DC/DC converter; and a third rectifying element that allows current to flow from the motor toward the DC/DC converter. In this way, a power supply connected to a motor can be suitably controlled.

Claims

1. A power supply control device for controlling a power supply connected to a motor, comprising:

a DC/DC converter making, out of a first DC power supply, a second DC power supply;

a first element for allowing current to flow from the first DC power supply toward the motor;

a second element for allowing current to flow from the first DC power supply toward the DC/DC converter; and

a third element for allowing current to flow from the motor toward the DC/DC converter.

2. The power supply control device according to claim 1, wherein

the motor is connected to a bidirectional driver;

the first element allows current to flow from the first DC power supply toward the bidirectional driver; and

the third element allows current to flow from the bidirectional driver toward the DC/DC converter.

3. The power supply control device according to claim 1, wherein at least one of the first to third elements is a diode that allows current to flow from its anode toward its cathode.

4. The power supply control device according to claim 1, wherein at least one of the first to third elements is a transistor.

5. The power supply control device according to claim 1, wherein the first element is a field-effect transistor that is turned off when regeneration occurs at the motor or when the motor is stopped.

6. The power supply control device according to claim 1, wherein the second element is a field-effect transistor that is turned off when regeneration occurs at the motor or when the motor is stopped.

7. The power supply control device according to claim 1, wherein the third element is a field-effect transistor that is turned on when regeneration occurs at the motor or when the motor is stopped.

8. The power supply control device according to claim 1, wherein the DC/DC converter is any of step-down, step-up, and step-up/down chopper circuits.

9. The power supply control device according to claim 1, wherein the second DC power supply output from the DC/DC converter is a control power supply.

10. The power supply control device according to claim 1, wherein the motor is a motor for an image forming device.

11. An image forming device comprising a power supply control device for controlling a power supply connected to a motor, the power supply control device including:

a DC/DC converter making, out of a first DC power supply, a second DC power supply;

a first element for allowing current to flow from the first DC power supply toward the motor;

a second element for allowing current to flow from the first DC power supply toward the DC/DC converter; and

a third element for allowing current to flow from the motor toward the DC/DC converter.

12. The image forming device according to claim 11, wherein

the motor is connected to a bidirectional driver;

the first element allows current to flow from the first DC power supply toward the bidirectional driver; and

the third element allows current to flow from the bidirectional driver toward the DC/DC converter.

13. The image forming device according to claim 11, wherein at least one of the first to third elements is a diode that allows current to flow from its anode toward its cathode.

14. The image forming device according to claim 11, wherein at least one of the first to third elements is a transistor.

15. The image forming device according to claim 11, wherein the first element is a field-effect transistor that is turned off when regeneration occurs at the motor or when the motor is stopped.

16. The image forming device according to claim 11, wherein the second element is a field-effect transistor that is turned off when regeneration occurs at the motor or when the motor is stopped.

17. The image forming device according to claim 11, wherein the third element is a field-effect transistor that is turned on when regeneration occurs at the motor or when the motor is stopped.

18. The image forming device according to claim 11, wherein the DC/DC converter is any of step-down, step-up, and step-up/down chopper circuits.

19. The image forming device according to claim 11, wherein the second DC power supply output from the DC/DC converter is a control power supply.