Abstract. To improve the energy quality, most of the renewable energy systems include an energy storage element charged by the bidirectional DC-DC converter. This paper proposes the bidirectional DC-DC converter which employs the two bridge configuration resonant class-E converters on the both sides of the isolating transformer. The low side converter is controlled as step up and the high side converter is controlled as step down. The proposed system is characterized by good dynamic properties and high efficiency because the converter transistors are switched in ZVS conditions. A theoretical analysis to provide relations for system design, and the laboratory model investigations to validate the system characteristic are given in the paper.
Absrruci I11 the paper a configuration of a soft-switched Quasi-Resonant Zero Voltage Switching Inverter (QRZVSI) is presented. The principle of its operation with methods of control is discussed, simulation voltage and current transients are given and an analysis of the operation of the proposed inverter is made. A detail analysis of the operation of resonant circuits with bi-directional current flow in the coupling circuit of a conventional inverter was made. The results of simulation calculations of losses anal the resulls of experimental studies of QRZVSI under soft switching are presented graphically. The advantages and disadvantages of tha QRzvS Inverter are discussed. I.. lNTRODUCTlQNRecently, in view of their advantages, interest in high frequency resonant converter systems has increased. High frequency operation, small dimensions, lower weight, hig;la efficiency and low switching losses are only a few of the features of the new topologies. In resonant inverters, semiconductor power devices are switched at zero voltages or currents thus theoretically eliminating switching losses. On the other hand, conduction losses rise in relation bo the peak value of the current wave and complexity of the inverter structure. Resonant inverters should be able 'to operate with PWM and should be so constructed that it is possible tis add simple commutation structures to the main circuits of the conventional voltage inverters.In the article a new inverter system is presented in which the quasi-resonant circuit is used as a system coupling the DC voltage source to a conventional voltage converter. The operation frequency of the quasi-resonant coupling circuit is several times higher than the PWM carrier frequency of' the inverter.In order to limit losses, the number of commutations during operation should be reduced. In the article a PWM control method suitable for a quasi-resonant inverter is presented. The PWM control strategy presented ensures soft-switching of all inverter valves during the flow o f load current in any direction.A detailed analysis of the resonant circuit operation with bi-directional current flow in the coupling circuit of the conventional inverter was made. The problem of the soft switching, of power valves with a return of energy to the supply source though omitted by many authors is a serious application problem. The analytical equations and simulation studies are in agreement with the results of the experimental investigations. An analysis comparing the total losses o f the resonant converter systems studied with the conventional hard switching converter was then made. QUASI-RESONANT ZVS PWM INVERTER.In Fig. 1 the Quasi-Resonant ZVS PWM Inverter analysed is presented. The circuit is simple in comparison with other Resonant Pole Inverters. The topology of the inverter is derived fiom the Auxiliary Resonant Commutated Pole Inverter 184. 1 Io Conventional W lnvertar Fig. 1. Quasi-Resonant ZVS PWM Inverter IJT. A. N ANALYSIS OF ZVS CIRCUIT OPERATIQNThe functioning of the circuit can be represented by t...
Abstract.A new concept of a DC-DC converter with galvanic isolation is proposed in this paper. The converter belongs to the class E resonant converters controlled by pulse width modulation via frequency regulation (PWM FM). Due to the possibility of operation in the boost and buck modes, the converter is characterized by a high range of voltage gain regulation. The principle of converter operation described by mathematical equations is presented. The theoretical investigations are confirmed by p-spice model simulations and the measurement of an experimental model of 1kW laboratory prototype.
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