Linearly regulated power supply

• US 20060108990A1
• Filed: 11/21/2005
• Published: 05/25/2006
• Est. Priority Date: 11/20/2004
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Zhou, Tong, Tu, Jia-Hui, Le, Kun, Chang, Chun-Hao
• Application Number:
  US11/285,261
• Publication Number:
  US 20060108990A1
• Time in Patent Office: Days
• US Class Current: 323/273
• CPC Class Codes: G05F 1/565 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor G05F1/563 takes precedence

Abstract

A linearly regulated power supply is provided for providing a load voltage to a load. In a preferred embodiment, the linearly regulated power supply includes: a voltage divider module for receiving a backup voltage and then providing a voltage reference; a controlling module for receiving the voltage reference and then providing a controlling voltage; and a regulating module receiving the controlling voltage and then regulating a core voltage down to a load voltage, the regulating module providing the load voltage to a load. The linearly regulated power supply is capable of reducing the power of the transistor, and has a higher efficiency.

Claims

1. A linearly regulated power supply comprising:

a voltage divider module capable of accepting a backup voltage and providing a voltage reference;

a controlling module capable of accepting the voltage reference and providing a controlling voltage; and

a regulating module capable of receiving the controlling voltage and regulating a core voltage down to a load voltage according to the controlling voltage so as to provide the load voltage to a load.

2. The linearly regulated power supply as claimed in claim 1, wherein the voltage divider module comprises two resistors connected to each other in series, and a node between the resistors for providing the voltage reference to the controlling module.

3. The linearly regulated power supply as claimed in claim 1, wherein the controlling module comprises an operational amplifier, the operational amplifier includes a non-inverting input terminal connected to the voltage divider module for receiving the voltage reference, an inverting input terminal connected to the regulating module for receiving a feedback voltage, and an output terminal connected to the regulating module for controlling the regulating module.

4. The linearly regulated power supply as claimed in claim 1, wherein the regulating module includes a MOSFET (metal-oxide-semiconductor field-effect transistor), a gate of the MOSFET is controlled by the controlling module, a drain of the MOSFET receives the backup voltage, and a source of the MOSFET provides the load voltage to the load.

5. The linearly regulated power supply as claimed in claim 1, wherein the backup voltage is 3.3V.

6. The linearly regulated power supply as claimed in claim 1, wherein the core voltage is 1.5V.

7. The linearly regulated power supply as claimed in claim 1, wherein the load voltage is 1.2V.

8. A linearly regulated power supply comprising:

a plurality of resistors connected to each other in series, the resistors receiving a backup voltage and then providing a voltage reference;

an operational amplifier for receiving the voltage reference and then providing a controlling voltage; and

a MOSFET (metal-oxide-semiconductor field-effect transistor) receiving the controlling voltage and then regulating a core voltage down to a load voltage, the regulating module providing the load voltage to a load.

9. The linearly regulated power supply as claimed in claim 8, wherein the operational amplifier includes a non-inverting input terminal connected to the resistors for receiving the voltage reference, an inverting input terminal connected to the MOSFET for receiving a feedback voltage, and an output terminal connected to the MOSFET for controlling the MOSFET.

10. The linearly regulated power supply as claimed in claim 8, wherein a gate of the MOSFET is controlled by the operational amplifier, a drain of the MOSFET receives the backup voltage, and a source of the MOSFET provides the load voltage to the load.

11. The linearly regulated power supply as claimed in claim 8, wherein the backup voltage is 3.3V.

12. The linearly regulated power supply as claimed in claim 8, wherein the core voltage is 1.5V.

13. The linearly regulated power supply as claimed in claim 8, wherein the load voltage is 1.2V.