POWER CONTROL DEVICE

• US 20110241643A1
• Filed: 03/28/2011
• Published: 10/06/2011
• Est. Priority Date: 03/31/2010
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: IINO, Yasuhiro
• Application Number:
  US13/073,281
• Publication Number:
  US 20110241643A1
• Time in Patent Office: Days
• US Class Current: 323/293
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C

Abstract

A power control device for the load element includes a variable capacitance element connected in parallel with the load element, and a control unit controlling a capacitance of the variable capacitance element and maintaining a degree of a voltage fluctuation due to a parasitic inductance of the line such that the degree of the voltage fluctuation is not more than a certain degree.

Claims

1. A power control device that is connected to a line supplying power from a power supply device to a load element and that stabilizes the power supply performed through the line, the power control device comprising:

a variable capacitance element connected in parallel with the load element; and

a control unit controlling a capacitance of the variable capacitance element, the control unit maintaining a degree of a voltage fluctuation due to a parasitic inductance of the line such that the degree of the voltage fluctuation is not more than a certain degree.

2. The power control device according to claim 1, wherein the variable capacitance element includes a capacitance element and a variable resistance element connected in series with the capacitance element, and the control unit changes a resistance value of the variable resistance element so that the capacitance of the variable capacitance element is controlled.

3. The power control device according to claim 2, wherein the variable resistance element includes two or more resistance elements that are connected in parallel with each other, and a switch unit configured to switch between supply and interruption of a current provided for each of the resistance elements, and wherein the control unit switches the switching unit, so that the resistance value of the variable resistance element is changed.

4. The power control device according to claim 2, wherein the variable resistance element includes a semiconductor element having a current input terminal, a current output terminal, and a current control terminal, and a resistance element connected in parallel between the current input terminal and the current output terminal, and wherein a current input to the current control terminal is controlled by the control unit and a value of a resistance provided between the current input terminal and the current output terminal is changed, so that the resistance value of the variable resistance element is changed.

5. An information communication apparatus comprising:

a load element;

a power supply device configured to supply power to the load element;

a variable capacitance element connected in parallel with the load element; and

a control unit configured to control a capacitance of the variable capacitance element, the control unit maintaining a degree of a voltage fluctuation due to a parasitic inductance of the line such that the degree of the voltage fluctuation is not more than a certain degree.