Abstract
This paper reports the occurrence of some abnormal operational modes in soft-switching converters. By constructing a Boolean matrix based on the states of the switching components, some unexpected topological states are identified. Consequently, these states excite the abnormal or sneaking operational modes as referred. A three-stage step-up zero- current switching converter is used as an illustrative example and detailed analysis has been carried out. The phenomenon has also been confirmed in experiences, where performance degradation is noticed.
Highlights
Pulse-width modulation has been widely employed for the design of switching power supply and motor drives for decades
It is found that unexpected dynamics may be excited in these converters due to the existence of abnormal topological states [8,9,10,11]. This is referred as sneaking operational modes (SOMs), which are similar to the sneaking circuits found in electrical and electronic circuits [12]
As compared with the normal operational modes given in Fig. (3), which can be represented by the following matrix B0:
Summary
Pulse-width modulation has been widely employed for the design of switching power supply and motor drives for decades. Capacitors and diode, zero-voltage or zerocurrent switching is achieved so that switching loss can be greatly reduced. It is found that unexpected dynamics may be excited in these converters due to the existence of abnormal topological states [8,9,10,11] This is referred as sneaking operational modes (SOMs), which are similar to the sneaking circuits found in electrical and electronic circuits [12]. It is considered as a typical example of zero-current switching.
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