N-Stage Exponential Charge Pumps, Charging Stages Therefor and Methods of Operation ThereofN - 級冪階電壓泵
A switch capacitor power converter, also known as a charge pump, is a component in the circuit that generates a high voltage using a low input voltage supply that provides power to a load using switches and capacitors. However, existing charge pumps involve too many capacitors and transistors and the conversion ratio (ratio of output voltage to supply voltage) is not high enough.
The present invention discloses a new type of charge pumps that has a high conversion ratio which is two to the power of N times the supply voltage. As it bears an exponential increase in the output voltage, it is also called an exponential charge pump. This N-stage exponential charge pump also contains fewer switches or fewer capacitors or both than a linear charge pump implementation. The production cost is therefore reduced.
This invention is particularly advantageous if applied in an electronic appliance, such as, but no limited to, an integrated circuit that uses a low voltage for part of the circuit but a much higher voltage for another part of the circuit.
1. Much higher conversion ratio using 2N only a 2-phase clock
2. Less switches and capacitors required
3. Higher efficiency
- Electrical appliances that use a low voltage for part of the circuit but a much higher voltage for another
part of the circuit
Patent Number: US7605640B2
Application Number: US2008143580A
Inventor: Ki, Wing Hung | Su, Feng | Lam, Yat Hei | Tsui, Chi Ying
Priority Date: 28 Dec 2004
Priority Number: US7605640B2
Application Date: 20 Jun 2008
Publication Date: 20 Oct 2009
IPC Current: G05F000110
US Class: 327536
Assignee Applicant: The Hong Kong University of Science & Technology
Title: N-stage exponential charge pumps, charging stages therefor and methods of operation thereof
Usefulness: N-stage exponential charge pumps, charging stages therefor and methods of operation thereof
Novelty: Charge pump e.g. N-stage exponential charge pump has charging stages each having set-up switches, charging switches, and grounding switches which are configured to operate in response to different edges of clock pulse of clock signal
Electronics
Circuit Design
20 Jun 2008
US 12/143580
US 7605640
TTC.PA.243S
Hong Kong
