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This paper describes influence real semiconductor devices, commutation strategies, modulation period selection and switch on resp. switch off times on output voltage of matrix converter. Methods for decreasing of the influence are mentioned in the paper too.
It has been observed that adoption of different possible switching patterns/schemes affects the transient behaviours such as phase current and torque of a PMBLDC motor. Four possible switching patterns are achieved by modulating only upper/lower switches and incoming/outgoing phase switches. For the purpose of control of PMBLDC motor low cost ATMEGA 32 micro-controller is used to generate all the...
This paper presents the SPMC topology which offers many advantages with unrestricted switch control or with minimal reactive device use, as an all silicon solution. It elucidates the implementation of SPMC as an inverter and as a Controlled Rectifier. Also, with proper switching control algorithm, a type of converter that can buck and boost with step-changed frequency called a Single-Phase Z-Source...
This paper deals with a new circuit prototype of two active edge resonant cells-assisted soft-switching symmetrical PWM half-bridge inverter type DC-DC high power converter employing a high frequency planar transformer with center-tapped secondary windings and rectifier with choke-input. Its operating principle is described in detail by using switching mode transition equivalent circuits which is...
The paper deals with the operation of a brushless DC drive during the phase commutation. At first, the various switching patterns that can be used to command the inverter are identified. It is demonstrated that the switching patterns are a combination of two basic commutation modes. For each mode, the current transients during the phase commutation are determined as well as two significant commutation-related...
A negative-bus auxiliary resonant circuit (NBARC) and control for soft-commutation at small residual terminal voltages of the IPMs / inverters is presented for benign DV/DT output waves and better electromagnetic compatibility. For a practical circuit design, the NBARC is proposed to control the main circuit commutation at low residual voltages, rather than a perfectly zero voltage, resulting in a...
This paper presents soft switching zero voltage switching high frequency inverter with reverse blocking single switch for dielectric barrier discharge lamp. The simple high-frequency inverter can completely achieve stable zero voltage soft switching (ZVS) commutation for wide its output power regulation ranges and load variations under its constant high frequency pulse density modulation (PDM) scheme...
From industrial experience, it is known that three-phase line commutated thyristor inverters encounter commutation failure during voltage dips. Following commutation failure, both upper&lower thyristors belonging to the same leg of the inverter conduct and a surge current results. This paper gives an analysis of this phenomenon in the event of a single-phase dip. A novel and simple solution for...
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