Heat dissipation circuit and regulator control circuit including the same

Patent metadata

Field	Value
Publication number	US-10437276-B2
Application number	US-201815866672-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Jan 16, 2017
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A regulator control circuit includes a regulator configured to provide an output voltage by regulation using one of an input voltage and a dropped input voltage, to a load; and a heat dissipation circuit configured to sense a change in the input voltage, and provide the dropped input voltage to the regulator when the input voltage is sensed to be equal to or higher than a preset level.

First claim

What is claimed is:

1. A regulator control circuit comprising:
a heat dissipation circuit configured to sense a change in an input voltage, and provide a dropped input voltage when the input voltage is sensed to be equal to or higher than a preset level; and
a regulator configured to provide an output voltage by regulation using one of the input voltage and the dropped input voltage, to a load,
wherein the heat dissipation circuit comprises:
a switch configured to transfer the input voltage to the regulator and turn off when the input voltage rises to be equal to or higher than the preset level;
a resistor configured to drop the input voltage and transfer the dropped input voltage to the regulator when the switch is turned off; and
a controller configured to sense a change in the input voltage being input to the regulator by the switch by comparing the input voltage with the preset level, and control the switch to be turned off when the input voltage rises to be equal to or higher than the preset level such that the dropped input voltage is transferred to the regulator by the resistor,
wherein the controller, the switch and the regulator are integrated into a chip, and the resistor is disposed outside the chip.

2. The regulator control circuit of claim 1 , wherein the heat dissipation circuit is configured to provide the input voltage to the regulator when the input voltage is sensed to be lower than the preset level.

3. The regulator control circuit of claim 1 , wherein the resistor is configured to transfer the dropped input voltage to the regulator such that heat is dissipated outside the regulator.

4. The regulator control circuit of claim 1 , wherein the controller is configured to turn off the switch when the input voltage is sensed to be equal to or higher than the preset level, and turn on the switch when the input voltage is sensed to be lower than the preset level.

5. The regulator control circuit of claim 1 ,
wherein the chip comprises:
a first input terminal configured to receive the input voltage;
a second input terminal configured to receive the dropped input voltage; and
an output terminal configured to output the output voltage to the load.

6. A heat dissipation circuit comprising:
a switch configured to transfer an input voltage to a regulator and turn off when the input voltage rises to be equal to or higher than a preset level;
a resistor configured to drop the input voltage and transfer a dropped input voltage to the regulator when the switch is turned off; and
a controller configured to sense a change in the input voltage being input to the regulator by the switch by comparing the input voltage with the preset level, and control the switch to be turned off when the input voltage rises to be equal to or higher than the preset level such that the dropped input voltage is transferred to the regulator by the resistor,
wherein the controller, the switch and the regulator are integrated into a chip, and the resistor is disposed outside the chip.

7. The heat dissipation circuit of claim 6 , wherein the controller is configured to turn off the switch when the input voltage is sensed to be equal to or higher than the preset level such that the dropped input voltage is transferred to the regulator by the resistor.

8. The heat dissipation circuit of claim 7 , wherein the controller is configured to turn on the switch when the input voltage is sensed to be lower than the preset level such that the input voltage is transferred to the regulator by the switch.

9. The heat dissipation circuit of claim 6 , wherein the regulator is configured to regulate an output current in correspondence to the input voltage or the dropped input voltage provided according to switch control of the controller, and provide an output voltage of a target level to a load.

10. The heat dissipation circuit of claim 9 ,
wherein the chip comprises:
a first input terminal configured to receive the input voltage;
a second input terminal configured to receive the dropped input voltage; and
an output terminal configured to output the output voltage to the load.

11. A regulator control circuit comprising:
a first input terminal configured to receive an input voltage;
a second input terminal configured to receive a dropped input voltage;
a regulator configured to provide an output voltage by regulation using one of the input voltage and the dropped input voltage, to a load;
a switch configured to transfer the input voltage being received through the first input terminal to the regulator and turn off when the input voltage rises to be equal to or higher than a preset level;
a resistor configured to drop the input voltage and transfer the dropped input voltage through the second input terminal to the regulator when the switch is turned off;
a controller configured to sense a level of the input voltage being input to the regulator by the switch by comparing the input voltage with the preset level, and control the switch to be turned off when the input voltage rises to be equal to or higher than the preset level such that the dropped input voltage is transferred to the regulator through the second input terminal by the resistor.

Assignees

• Silicon Works Co Ltd

Inventors

• Lee Ju Hyun
• Kim Kyu Ho
• Jung Chun Sik
• Kim Sung Gon

Classifications

• G05F5/00 Primary

  Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output · CPC title

• G05F1/10

  Regulating voltage or current  (G05F1/02 takes precedence) · CPC title

• H02H3/20

  responsive to excess voltage · CPC title

• H02P9/305

  controlling voltage (H02P9/302 takes precedence) · CPC title

• H02H9/045

  adapted to a particular application and not provided for elsewhere · CPC title