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Variable switching frequency is an unsolved problem in controlled-type soft-switching inverter. This paper presents two controlled-type soft-switching current modulations capable to achieve fixed switching frequency, one is by the combination of hysteresis control and triangular carrier control, the other is by variable hysteresis bandwidth. Meanwhile, a prototype of a single-phase full-bridge inverter...
Series‐connected lithium batteries can be charged in the pack‐charging mode, which is most widely used in the lithium battery application field. But the pack‐charging mode will lead to cell imbalance because of the difference in the electrochemical characteristics of the cells of series‐connected batteries. On the other hand, the cell‐charging mode can avoid the imbalance problem by charging each...
A digital zero-voltage switching(ZVS) current control method which is suitable for full-bridge or half-bridge inverter is proposed in this paper to achieve high power density, low cost and high conversion efficiency. The digital current control scheme is realized by DSP TMS320F28035 and does not demand complex algorithm, or extra analog circuits. Furthermore, ZVS is achieved by inductor current operating...
As off-board battery charger for electric vehicles (EVs) has little limitations of weight, volume and power capacity, this paper introduces a new architecture for off-board battery charger. It is based on multi-pulse flexible-topology thyristor rectifier, which operates in series or parallel mode via flexible-topology switching, according to battery voltage. By flexible-topology operation, the proposed...
A high performance inverter requires high power density, high reliability, and low cost. An adaptive controlled-type soft-switching technique achieves high efficiency and requires no additional power devices or magnetic components but with inherent frequency variation. Based on the general full-bridge inverter topology, the change in frequency under various modulation modes and load properties are...
Series-connected lithium batteries can be charged in pack mode that is most widely used in lithium battery application field. But pack charging mode will lead to cell unbalanced charging because of cell differences among series-connected batteries in electrochemical characteristic. On the other hand, the cell charging mode can avoid the imbalance problem by charging each cell independently as a result...
Vienna rectifier is one of the most popular topologies for three-phase PFC converter. DC voltage, grid current double loop controller and three-level SVPWM are normally used to control the Vienna rectifier. Accurately detecting the current zero-crossing point is required to achieve the correct SVPWM signals since the output level of Vienna rectifier is also decided by the direction of the phase current...
The state of charge online estimation of EV/HEV lithium battery with high accuracy is very important, Since it can be used to prolong the battery lifetime and improve its performances. Traditional SOC estimation algorithms have show their drawbacks apparently, so the Adaptive Wavelet Neural Network(AWNN) based SOC estimation model is presented. By using adaptive algorithm to train the model, the accurate...
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