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A novel electronic ballast using dual buck half-bridge inverter is proposed in this paper. The inverter not only eliminates the output waveform distortion problems, but also easily achieves all switches of ZVS state. It is controlled at constant switching frequency by the duty cycle parameter. The IC UCC3305 supplies the high-intensity-discharge (HID) lamp with low-frequency square-wave sources to...
Aiming at the single-phase current five-level inverter, the thesis analyzes the reasons for unbalanced inductor current, introduces some types of present strategies for balancing the inductor current through current sharing, and points out separately the current sharing principles for these strategies, comparing their advantages and shortcomings and then puts forward a new strategy for hysteresis...
Based on a kind of hybrid control photovoltaic grid-connected cascaded inverter proposed by the author, this paper proposes a simple method by which we can confirm the triggering angles of the unit inverter with the step wave overlap control mode, computes the output power of each unit inverter, proposes the operation mode exchange solution to solve the unbalanced output power problem of the cell...
This paper proposes a hybrid control method for cascaded inverter with step waveform and instantaneous current control. With this method, one part of the cascaded unit uses step waveform control, and the other part of the cascaded unit uses instantaneous control. The output voltage comes from the two parts in series. This method can decrease the switching time, reduce the switching loss. The structure...
A novel method (AC-DC-AC) to produce symmetrical four-phase voltage is presented in this paper, The main circuit is the four-bridge topology and the control method is the three-dimensional voltage space vector control. This method has the merits of novel design, high conversion efficiency, good waveform quality and the method is easily to be realized.The power circuit topology of realizing four- phase...
The multiple overlap mode of the overlap carrier wave phase shift PWM (SVPWM) inverter is one of the development directions of the super-high capacity inverter, this paper reasons the relation between carrier wave phase shift SVPWM circuit output voltage and phase shift angle, put forward the best phase shift angle formula, proposed two kinds of control schemes and compares them. Through the experiment...
This paper analyzed the neutral-point balancing problem of the neutral-point-clamped (NPC) three-level space voltage vector pulse-width modulation (SVPWM) inverter and the influence of each vector to the neutral-point voltage. Based on the normal control strategies to solve the neutral-point balancing problem, including the open-circuit passive control strategy, the hysteresis-band control strategy,...
A novel method (AC-DC-AC)to produce symmetrical four-phase voltage is presented in this paper, The main circuit is the four-bridge topology and the control method is the three-dimensional voltage space vector control. This method has the merits of novel design, high conversion efficiency, good waveform quality and the method is easily to be realized.The power circuit topology of realizing four- phase...
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