Battery voltage controller for DC motor

• US 5,703,447 A
• Filed: 04/20/1995
• Issued: 12/30/1997
• Est. Priority Date: 04/21/1994
• Status: Expired due to Term

• Current Assignee: Funai Electric Co., Ltd.
• Original Assignee: Funai Electric Co., Ltd.
• Inventors: Higuchi, Yoshio
• Primary Examiner(s): Wysocki, Jonathan
• Application Number:
  US08/425,789
• Time in Patent Office: 985 Days
• Field of Search: 318/139, 318/140, 318/375, 318/376, 318/141, 318/430, 318/431, 318/432, 322/13, 322/14, 322/25, 322/28, 323/259, 323/660, 363/19, 363/21, 363/23, 363/25, 363/26, 363/102, 363/164, 363/174, 363/175, 363/59, 363/79, 363/89
• US Class Current: 318/139
• CPC Class Codes: H02P 7/06 for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current

Abstract

A driver for driving a loading motor of a single-unit video camera-recorder. In the driver, a DC voltage supplied from a battery is boosted by a DC/DC converter, and the boosted DC voltage is supplied to the loading motor through a switch unit in which the polarity of the boosted DC voltage is switched.

Claims

1. A driver for driving a loading motor of a single-unit video camera-recorder, comprising:

a battery;

a DC/DC converter for boosting and outputting a DC voltage supplied from said battery;

a switch unit having a predetermined voltage loss for switching a polarity of the DC voltage received from and boosted by said DC/DC converter; and

a loading motor to which the boosted DC voltage from said DC/DC converter is supplied through said switch unit, said loading motor being provided with a reduction unit for reducing a rotational speed of said loading motor at a predetermined reduction ratio;

said DC/DC converter boosting said DC voltage by an amount corresponding substantially to said voltage loss.

2. The driver according to claim 1, wherein said battery is a nickel-cadmium cell.

3. The driver according to claim 1, wherein said switch unit includes four switches connected in a bridge circuit fashion, each of said switches being formed of a transistor.

4. The driver according to claim 1, wherein the number of turns of winding of said loading motor corresponds to the boosted DC voltage supplied from said DC/DC converter through said switch unit.

5. The driver according to claim 1, further comprising a control unit for supplying to said switch unit command signals to switch the polarity of the boosted DC voltage.