DocumentCode :
2543054
Title :
Design of a Transient Voltage Clamp (TVC) Based On Output Impedance Analysis
Author :
Lim, Sungkeun ; Li, Ding ; Huang, Alex Q. ; Xu, Xiaojun
Author_Institution :
Semiconductor Power Electronics Center (SPEC), North Carolina State University, Raleigh, NC 27606 USA
fYear :
2007
fDate :
Feb. 25 2007-March 1 2007
Firstpage :
1636
Lastpage :
1638
Abstract :
This paper presents a new design of methodology of the transient voltage clamp (TVC) based on the output impedance. TVC works in parallel with a voltage regulator (VR)´s ceramic cap to achieve a faster voltage regulation without huge bulk capacitor. Hence it acts as a replacement of the bulk cap. Due to the limited control bandwidth, traditional VR could not respond rapidly to the load transient. As a result, a large output voltage spike can occur during load transient hence requiring large amount of bulk cap to decouple the VR from the load. The specific function of TVC is to replace the bulk cap and sink or source large currents similar to the bulk cap. This will allow fast transient response without large bulk capacitor. The main challenge in applying the TVC is how to design the TVC that will not interfere with VR operation. In this paper, the total system output impedance, the TVC impedance concept, system control bandwidth and transient response are discussed. The theoretical analysis will be confirmed by the cadence simulation results.
Keywords :
Bandwidth; Capacitors; Clamps; Design methodology; Impedance; Regulators; Transient analysis; Transient response; Virtual reality; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Power Electronics Conference, APEC 2007 - Twenty Second Annual IEEE
Conference_Location :
Anaheim, CA, USA
ISSN :
1048-2334
Print_ISBN :
1-4244-0713-3
Type :
conf
DOI :
10.1109/APEX.2007.357737
Filename :
4195940
Link To Document :
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