A new current regulator for the APS storage ring correction magnet bipolar switching mode converters.
The correction magnets in the Advanced Photon Source's storage ring are powered by PWM-controlled bipolar switching-mode converters. These converters are designed to operate at up to {+-}150 A. The original control circuit used a polarity detection circuit with a hysteresis to determine which IGBT was needed to regulate the current with a given polarity. Only the required IGBT was switched with PWM pulses while others were held on or off continuously. The overall IGBT switching losses were minimized by the design. The shortcoming of the design was that the converter's output was unstable near zero current because of the hysteresis. To improve the stability, a new current regulator using a different PWM method has been developed to eliminate the requirement of the polarity detection. With the new design, converters can operate smoothly in the full range of {+-}150 A. The new design also meets tighter specs in terms of the ripple current and dynamic response. This paper describes the design of the new regulator and the test results.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 992037
- Report Number(s):
- ANL/ASD/CP-112605; TRN: US1007597
- Resource Relation:
- Conference: 9th European Particle Accelerator Conference (EPAC '04); Jul. 5, 2004 - Jul. 9, 2004; Lucerne, Switzerland
- Country of Publication:
- United States
- Language:
- ENGLISH
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