Abstract
In some high-performance applications, an LC filter must be added to the auxiliary resonant snubber inverter (ARSI) to reduce the output current ripple. However, resonance occurs due to the additional LC filter, which makes the traditional closed-loop control not suitable to be used directly. Therefore, this paper presents a double-loop digital control based on the active damping method of capacitor current feedback to stabilize the system. Most of the studies on active damping methods are focused on the grid in consideration of zero resistance. However, the load resistance should not be neglected in the drive system. Therefore, the load resistance and digital control delays are considered in this paper. Moreover, an improved loading method is proposed to improve the duty ratio range. In order to verify the effectiveness of the controller, a prototype was developed. The simulation and experimental results demonstrate that soft-switching can be realized for the entire load range. The maximum duty ratio is improved by 0.01 by using the proposed loading method. The resonance can be eliminated by using the proposed control method.
Highlights
In power electronic converters, high switching frequency is a highly desirable feature, which can reduce the volume and power density of converters, and increase the dynamic response.high switching frequency brings about the problems of high switching loss and severe electromagnetic interference (EMI) [1,2]
High switching frequency brings about the problems of high switching loss and severe electromagnetic interference (EMI) [1,2]
An auxiliary circuit connected parallel to the main power path is employed in the ZVT PWM inverter, which only operates for a short interval before and after the commutation period of the main switches
Summary
High switching frequency is a highly desirable feature, which can reduce the volume and power density of converters, and increase the dynamic response. Compared with other soft-switching inverters, the voltage and current stresses and conduction losses are much lower [3,4] Contributing to these advantages, the ZVT PWM inverter is well accepted. The ZVT inverter coupled auxiliary switches and fit to the conventional the ZVTusing inverter usingmagnetics coupled has been proposed to eliminate the split capacitors [9,10,11]. These topologies need coupled magnetics has been proposed to eliminate the split capacitors [9,10,11].
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