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Switched-Capacitor Regulators面積效率高和準確性高的開關電容穩壓器

Summary

Switched-capacitor (SC) regulators are important components in many portable electronic applications such as mobile phones and PDAs to provide stable voltage supply for other different processing systems. Conventionally, extra power transistor or auxiliary circuits were used in the regulators for monitoring the output voltage. However, area efficiency, accuracy and manufacturing cost were not optimized.

This invention provides a control method for output regulation of a switched-capacitor regulator where chip area is reduced and small output ripple voltage at low switching frequency can be achieved. A power transistor can be omitted compared to the conventional design.

In addition, it also proposes a multi-stage switchable operational amplifier to implement the controller. Accuracy of the regulator is enhanced because of improved line and load regulations by alternate switching of gain stages in different clock phases. A compensation technique is proposed in the operational amplifier to ensure stability and fasten the load transient responses.

Moreover, the invention shows significant improvement on prior regulated charge pumps. It is widely applicable to be used as supplies of high-performance analog systems.

Technology Benefits

1. Smaller chip area and better area efficiency
2. Lower manufacturing cost
3. Higher accuracy output voltage
4. Higher light-load power efficiency
5. Long standby time of the switched-capacitor regulator
6. Faster transient responses
7. Possible extension to other SC dc-dc converter

Technology Application

- Portable electronic devices such as mobile phones and PDAs to provide stable supply voltage

Supplementary Information

Patent Number: US7633778B2
Application Number: US200859975A
Inventor: Mok, Kwok Tai Philip | Lee, Hoi
Priority Date: 24 Jan 2005
Priority Number: US7633778B2
Publication Date: 15 Dec 2009
IPC Current: H02M000318
US Class: 363060 | 323266
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Switched-capacitor regulators
Usefulness: Switched-capacitor regulators
Summary: Method for controlling an output voltage of a switched-capacitor regulator (claimed) e.g. boost switched-capacitor regulator, in a portable electronic device such as personal digital assistant, notebook computer and mobile phone.
Novelty: Switched-capacitor regulator's output voltage controlling method for use in e.g. notebook computer, involves controlling resistances within switched capacitor regulator to regulate output voltage

Industry

Biomedical

Sub Group

Medical Composition

Application Date

31 Mar 2008

Application No.

US 12/059975

Patent Information

US 7633778

ID No.

TTC.PA.247S

Country/Region

Hong Kong

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