IPAC2012 - List of Authors (Huang, J.C.)

Paper	Title	Page
MOPPP077	Heat Load Budget on TPS Undulator in Vacuum	741
	J.C. Huang, J. Chen, C.-S. Hwang, F.-Y. Lin, Y.T. Yu NSRRC, Hsinchu, Taiwan
	The performance of an insertion device is limited by the magnet gap because a small gap affects the dynamic aperture and results in a short life time of the beam. An in-vacuum undulator is designed to have no vacuum chamber between the magnet arrays so to allow the entire magnet gap to be fully used for the dynamic aperture. An in-vacuum undulator can optimally minimize the gap to achieve continuous energy spectra. One problem of an undulator with a small gap is resistive wall heating by the image current. The heat load depends strongly on the injected mode in the storage ring; injection of multiple bunches might deteriorate the thermal performance for the magnet array. In this paper, we present a calculation of the heat load budget for a magnet array of an in-vacuum undulator of Taiwan Photon Source (TPS).

THPPD061	Optimal Design for Resonant Power Transformer	3650
	C.-Y. Liu, D.-G. Huang, J.C. Huang NSRRC, Hsinchu, Taiwan
	The energy and dc to dc conversion of the resonant transformer are required to achieve optimal design and working condition of the resonant region frequency. To meet this requirement, the core loss will be checked first by data book for calculation. Using a reliable precise instrument is needed to scan the resonant cure of the resonant transformer as we designed the resonant cure. We calculated the conduction loss in second design step. We design a resonant transformer which the conduction loss equal core loss does not meet optima design, because the core loss is very high when the transformer works in resonant frequency. Thus, we only reduce the conduction loss is optima design aspect.

THPPD062	Development of Digital-controlled Corrector Magnet Power Converter with Shunt as a Current Sensing Component	3653
	B.S. Wang, J.C. Huang, K.-B. Liu NSRRC, Hsinchu, Taiwan
	In Taiwan light source (TLS), Bira MCOR power converter modules are adopted as the corrector magnet power converters, the output is regulated by analog PWM IC that caused nonlinear behavior at zero cross and the adjustment of compensator for difference kind of magnet load is inconvenient. In the thesis the analog regulation IC is replaced by a fully digital regulation control circuit to realize digital regulation control converter. With plugging the home-made fully DSP regulation control cards into MCOR30 that the current sensing component is a shunt, the switching losses of MOSFET was reduced and the cost that the component of current sense. With the fully digital regulation control circuit, the parameter of the compensator for different magnet load is very easy to adjustment. In addition, the feasibility and validity of MOSFET switching theorem is simulated with Matlab simulink and the performance of this power converter is verified, the output current ripple of this power converter could be lower than 10ppm, which is beyond the requirement of current TLS corrector power converter and qualified to be used in the future TPS facility.

THPPD063	Zero Voltage Switching of Two-switch Flyback-Forward Converter	3656
	J.C. Huang, K.-B. Liu, Y.S. Wong NSRRC, Hsinchu, Taiwan
	The traditional pulse-width-modulated flyback converter power switch has serious electromagnetic interference (EMI) and lower conversion efficiencies problems due to the hard-switching operations. This paper produces a zero voltage switching of flyback-forward converter with an active-clamp circuit, the traditional pulse-width-modulated flyback converter with a active clamp circuit to achieve zero-voltage-switching (ZVS) at both main and auxiliary switches, the active-clamp circuit can reduce most of switching loss and voltage spikes across the switches and improve the overall efficiency of the converter. The theoretical analysis of soft switching flyback-forward converter with an active-clamp circuit is verified exactly by a prototype of 50W with 100V input voltage, 5V output voltage and 30kHz operated frequency.

THPPD064	The Compensator Design of the Fully Digital Controlled Corrector Magnet Power Converter by Using LabView as the Development Tools	3659
	B.S. Wang, J.C. Huang, K.-B. Lin NSRRC, Hsinchu, Taiwan
	The auto-tuning of PI-compensator for power converter is fulfilled by using the LabVIEW. The current error signals of the power converter with different PI compensating parameters are transferred by RS-232 or Ethernet communication interface from DSP card into LabVIEW and FFT analysis are calculated. The FFT analysis are stored in the batch file for further numerical analysis and the parameters with the best response is recognized which will be set as the default PI parameters. In addition, the feasibility and validity of auto-tuning theorem was verified by measuring the long-term stability of output current and during the long-term measuring period the stability and ripple current of the power converter are observed. In this thesis, the fully digital regulation controlled corrector magnet power converter with a shunt as the current sensing component was used as the developing platform. The auto-tuning theorem was realized and applied to the compensator of the power converter, and the best output current response of the power converter was fulfilled.

THPPD066	High Precision Programmable of TPS Quadrupole Magnet Power Supply	3662
	Y.S. Wong, J.C. Huang, K.-B. Liu, W.S. Wen NSRRC, Hsinchu, Taiwan
	In 1993, the first of Taiwan light source was held on October 16. First beam stored in the storage ring and facility at synchrotron radiation research centre (SRRC) was opened to users and the full energy injection to 1.5Gev after seven years. In 2007, the president of Executive Yuan Taiwan had been announcement to set up a third-generation synchrotron radiation. Taiwan Photon Source (TPS) project total budget of NT6, 885 million from 2007~ 2013. TPS project will improve technical capability to build to3.3Gev electron energy. Totally had been installed 1032sets of magnet power supplies for the storage ring and 152 sets for the injector. In the future, Taiwan photon source set up complete and operation, it will offer one of the world's brightest synchrotron x-ray sources.

THPPD067	Performance of Kicker Pulsers for TPS Project	3665
	C.-S. Fann, C.-T. Chen, K.T. Hsu, S.Y. Hsu, J.C. Huang, K.-K. Lin, K.-B. Liu, H.M. Shih, K.L. Tsai NSRRC, Hsinchu, Taiwan
	A set of kicker power suppliers has been designed and fabricated for storage ring beam injection of the Taiwan Photon Source (TPS) project. In order to fulfill the requirements, the performance of the designed units has been bench tested and the results are examined. The matching in four pulsers, the pulse-to-pulse stability and the time jitter are specified according to the beam injection requirements. The engineering evaluation and the measurement results are briefly discussed.

Paper

Title

Page

Heat Load Budget on TPS Undulator in Vacuum

741

J.C. Huang, J. Chen, C.-S. Hwang, F.-Y. Lin, Y.T. Yu
NSRRC, Hsinchu, Taiwan

The performance of an insertion device is limited by the magnet gap because a small gap affects the dynamic aperture and results in a short life time of the beam. An in-vacuum undulator is designed to have no vacuum chamber between the magnet arrays so to allow the entire magnet gap to be fully used for the dynamic aperture. An in-vacuum undulator can optimally minimize the gap to achieve continuous energy spectra. One problem of an undulator with a small gap is resistive wall heating by the image current. The heat load depends strongly on the injected mode in the storage ring; injection of multiple bunches might deteriorate the thermal performance for the magnet array. In this paper, we present a calculation of the heat load budget for a magnet array of an in-vacuum undulator of Taiwan Photon Source (TPS).

THPPD061

Optimal Design for Resonant Power Transformer

3650

C.-Y. Liu, D.-G. Huang, J.C. Huang
NSRRC, Hsinchu, Taiwan

The energy and dc to dc conversion of the resonant transformer are required to achieve optimal design and working condition of the resonant region frequency. To meet this requirement, the core loss will be checked first by data book for calculation. Using a reliable precise instrument is needed to scan the resonant cure of the resonant transformer as we designed the resonant cure. We calculated the conduction loss in second design step. We design a resonant transformer which the conduction loss equal core loss does not meet optima design, because the core loss is very high when the transformer works in resonant frequency. Thus, we only reduce the conduction loss is optima design aspect.

THPPD062

Development of Digital-controlled Corrector Magnet Power Converter with Shunt as a Current Sensing Component

3653

B.S. Wang, J.C. Huang, K.-B. Liu
NSRRC, Hsinchu, Taiwan

In Taiwan light source (TLS), Bira MCOR power converter modules are adopted as the corrector magnet power converters, the output is regulated by analog PWM IC that caused nonlinear behavior at zero cross and the adjustment of compensator for difference kind of magnet load is inconvenient. In the thesis the analog regulation IC is replaced by a fully digital regulation control circuit to realize digital regulation control converter. With plugging the home-made fully DSP regulation control cards into MCOR30 that the current sensing component is a shunt, the switching losses of MOSFET was reduced and the cost that the component of current sense. With the fully digital regulation control circuit, the parameter of the compensator for different magnet load is very easy to adjustment. In addition, the feasibility and validity of MOSFET switching theorem is simulated with Matlab simulink and the performance of this power converter is verified, the output current ripple of this power converter could be lower than 10ppm, which is beyond the requirement of current TLS corrector power converter and qualified to be used in the future TPS facility.

THPPD063

Zero Voltage Switching of Two-switch Flyback-Forward Converter

3656

J.C. Huang, K.-B. Liu, Y.S. Wong
NSRRC, Hsinchu, Taiwan

The traditional pulse-width-modulated flyback converter power switch has serious electromagnetic interference (EMI) and lower conversion efficiencies problems due to the hard-switching operations. This paper produces a zero voltage switching of flyback-forward converter with an active-clamp circuit, the traditional pulse-width-modulated flyback converter with a active clamp circuit to achieve zero-voltage-switching (ZVS) at both main and auxiliary switches, the active-clamp circuit can reduce most of switching loss and voltage spikes across the switches and improve the overall efficiency of the converter. The theoretical analysis of soft switching flyback-forward converter with an active-clamp circuit is verified exactly by a prototype of 50W with 100V input voltage, 5V output voltage and 30kHz operated frequency.

THPPD064

The Compensator Design of the Fully Digital Controlled Corrector Magnet Power Converter by Using LabView as the Development Tools

3659

B.S. Wang, J.C. Huang, K.-B. Lin
NSRRC, Hsinchu, Taiwan

The auto-tuning of PI-compensator for power converter is fulfilled by using the LabVIEW. The current error signals of the power converter with different PI compensating parameters are transferred by RS-232 or Ethernet communication interface from DSP card into LabVIEW and FFT analysis are calculated. The FFT analysis are stored in the batch file for further numerical analysis and the parameters with the best response is recognized which will be set as the default PI parameters. In addition, the feasibility and validity of auto-tuning theorem was verified by measuring the long-term stability of output current and during the long-term measuring period the stability and ripple current of the power converter are observed. In this thesis, the fully digital regulation controlled corrector magnet power converter with a shunt as the current sensing component was used as the developing platform. The auto-tuning theorem was realized and applied to the compensator of the power converter, and the best output current response of the power converter was fulfilled.

THPPD066

High Precision Programmable of TPS Quadrupole Magnet Power Supply

3662

Y.S. Wong, J.C. Huang, K.-B. Liu, W.S. Wen
NSRRC, Hsinchu, Taiwan

In 1993, the first of Taiwan light source was held on October 16. First beam stored in the storage ring and facility at synchrotron radiation research centre (SRRC) was opened to users and the full energy injection to 1.5Gev after seven years. In 2007, the president of Executive Yuan Taiwan had been announcement to set up a third-generation synchrotron radiation. Taiwan Photon Source (TPS) project total budget of NT6, 885 million from 2007~ 2013. TPS project will improve technical capability to build to3.3Gev electron energy. Totally had been installed 1032sets of magnet power supplies for the storage ring and 152 sets for the injector. In the future, Taiwan photon source set up complete and operation, it will offer one of the world's brightest synchrotron x-ray sources.

THPPD067

Performance of Kicker Pulsers for TPS Project

3665

C.-S. Fann, C.-T. Chen, K.T. Hsu, S.Y. Hsu, J.C. Huang, K.-K. Lin, K.-B. Liu, H.M. Shih, K.L. Tsai
NSRRC, Hsinchu, Taiwan

A set of kicker power suppliers has been designed and fabricated for storage ring beam injection of the Taiwan Photon Source (TPS) project. In order to fulfill the requirements, the performance of the designed units has been bench tested and the results are examined. The matching in four pulsers, the pulse-to-pulse stability and the time jitter are specified according to the beam injection requirements. The engineering evaluation and the measurement results are briefly discussed.