And9408 basic principles of llc resonant half bridge converter. A potential transformer is a conventional transformer having primary and secondary windings. The piezoelectric transformer to measure high voltage the research activity about piezoelectric voltage transformers started at the end of 1994. Apr 15, 2018 since the transformer core is operated under saturation, small change in input voltage do not cause any significant change in the output voltage.
This specific transformer is named after nikola tesla, a serbianamerican pioneer of electrical apparatus, methods. Analytic design method for integrated transformers of. Pdf a resonant transformer for high voltage testing of. Resonant transformer whenever the requirement of the test voltage is too much high, a single unit transformer can not produce such high voltage very. Dn1158 200w resonant power supply reference design.
Transformer designer for isolated high voltage power design. High performance resonant mode controller with integrated high voltage drivers the ncp97 is a high performance controller that can be utilized in half bridge resonant topologies such as series resonant, parallel resonant and llc resonant converters. Oct 02, 2015 resonant transformers parallel resonant a. It is a high voltage transformer that consists of two high q coils primary and secondary that are wounded on either same ferrite or air core with capacitors are connected across the windings. An insulation based industry uses often the resonant based test sources. A laboratory test showed that the required high voltage of 23kv could. Pdf analysis and design of a high voltage flyback converter.
Anderson the classic tesla coil a dualtuned resonant circuit november 24, 2000 1 preface the tesla coil is a high voltage twocoil resonant transformer. Resonant selftracking currentfed converter rstcfc is investigated as a proofofconcept of a high voltage power supply particularly for an xray system. The classic tesla coil a dualtuned resonant transformer by barton b. This resonant tank functions to position zero voltage across the switching device prior to turnon, eliminating any power loss due to the simultaneous overlap of switch current and voltage at each transition. Since the transformer core is operated under saturation, small change in input voltage do not cause any significant change in the output voltage. However, this type of system radiates most of its energy into empty space, unlike modern wireless power systems which waste very little energy. Pdf a partial core transformer has been designed such that its magnetising reactance has been matched to a generator stator insulation. By analysis, design and simulation of src, prc and sprc, the conclusion is that these three converters all cannot be optimized at high input voltage.
The equivalent circuit of a high voltage testing resonant transformers consists of the leakage reactance of the windings, the winding resistances, the magnetizing reactance, and the shunt capacitance across the output terminal due to the bushing of the high voltage terminal and also that of the test object. Pdf equivalent circuit for highvoltage partialcore. When the current in the resonant 1 for this ac analysis, only the fundamental component of the squarewave voltage input to the resonant network contributes to the power transfer to output. As known, tesla transformer presents a phenomenon of high voltage obtained through resonance of lc circuit, where the inductor l is a secondary of transformer with primary excited by a pulsed voltage square wave above. Pmp20289 400v 12v500w high frequency resonant converter reference design using high voltage gan devices top of board image. Fully assembled board shown above developed for testing and performance validation only, not available for sale. For a single transformer noncascaded transformer design, the tank is normally grounded to. This thesis focuses on the dcdc converter for high voltage battery charger and is divided into four chapters.
Equivalent circuit for high voltage partialcore resonant transformers article pdf available in iet electric power applications 23. These systems require fast voltage rise times and low ripple to yield a clear. A high voltage inductor was designed and used in the testing of a generator at a new zealand power station. Index termshighvoltage transformer, inductor model, parasitic capacitance, resonant converter, transformer model. By arranging particular magnetic properties of a transformer core, and installing a ferroresonant tank circuit a capacitor and an additional winding, a transformer can be arranged to automatically keep the secondary winding voltage relatively constant for varying primary supply without additional circuitry or manual adjustment. Snubber circuits suppress voltage transient spikes in.
The transformer core is connected to the same potential as the tank body. The input voltage is split between this impedance and the load. In this design, the oil insulated high voltage transformer is contained within a conducting vessel, typically a welded steel tank. High voltage and insulation engineering virtual lab iitkgp. Pdf a resonant transformer for high voltage testing of generator. It integrates 600 v gate drivers, simplifying layout and reducing external component count. Resonant transformers are also used in electronic ballasts for gas discharge lamps, and high voltage power supplies. High voltage partialcore resonant transformers simon colin bell a thesis presented for the degree of doctor of philosophy in electrical and computer engineering at the university of canterbury, christchurch, new zealand. Thus, high transformer external overvoltages are likely to occur if the following conditions are met as follows. One of teslas dreams was to employ his coil technology to distribute electric power without the need for wires, simply broadcasting it in the form of radio waves which could be received and conducted to loads by means of antennas. Pdf design and testing of a high frequency aircored resonance. Ultimately, an llc resonant converter with an output power of 1 kw, switching frequency of 500 khz, input voltage of 400 v, and output voltage of 300 v was achieved in this study.
All phenix ac resonant test systems consist of two main components. Highfrequency llc resonant converter with gan devices. Resonant transformer the equivalent circuit of a highvoltage testing transformer consist of the leakage reactances of the windings, the winding resistances, the magnetizing reactance and the shunt capacitance across the output terminals due to the bushing of the high voltage terminal and also that of the test object. Resonant hybrid flyback, a new topology for high density. This combination of an inductor with capacitor makes two coupled lc circuits. Applied power electronics conference and exposition, ieee xplore, 2009, 10341038. The tesla coil is a resonant, highfrequency stepup transformer used to produce extremely high voltages. The resonant controller part of the ic includes a highvoltage level shift circuit and several protection features such as overcurrent prot ection, openloop protection, capacitive mode protection and a general purpose latched protection input. Design guidelines for quasiresonant flyback converters. This is the only capacitor value which results in no voltage rise at the supply frequency, and is used for this reason to examine inductive kick in a separate section below. Introduction there has been a long desire for converter miniaturization to increase its power density and efficiency.
A resonant transformer for high voltage testing of. High efficiency dcdc converter for ev battery charger. A regular llc resonant half bridge converter works a combination mode of a voltage divider and amplifier of resonant inductor voltage of the resonant tank. The flyback dcdc converter topology results in significant cost and space savings for multiple output power supplies with high output voltage for power levels up to 100w. Ac resonant test systems, as the voltage is only present when the resonant condition exists. Digital controller for highefficiency resonant power supply rev.
High efficiency resonant dcdc converter for solar power applications by wardah inam b. This thesis presents the analysis, design, simulation and experimental results of threephase highfrequency transformer isolated resonant converters. The component design depends on customer requirements and may include options necessary to perform at very high voltage levels. Special transformers and applications transformers. Resonant converters are capable to achieve soft switching and operate at high frequency. Resonant converter is characterized as a twoport element, considering the input impedance, and the forward transfer characteristic. Resonant transformer is able to produce high voltage and high current and for extremely high voltage requirement, the cascading of resonant transformer is also possible. They are also used in some types of switching power supplies. High frequency llc resonant converter with magnetic shunt.
Ncp97 high performance resonant mode controller with. Improved highvoltage resonant controller datasheet production data features 50% duty cycle, variable frequency control of resonant half bridge highaccuracy oscillator up to 500 khz operating frequency twolevel ocp. Designing an llc resonant halfbridge power converter article. If the resonant tank circuit is not present, the output voltage will be a square wave with high harmonic voltage distortion. In high voltage low power applications, the effect of a transformers stray capacitance might be the most important factor that influences the overall performance of the circuit. Operation and design 4 application note an 201209 v1.
The systems controls may be contained within the regulator cabinet or in a separate console. Abstract in this paper, a highefficiency high power density llc resonant converter with a matrix transformer is proposed. A detailed mode analysis and the design procedure are presented in designing the high. Using transformer parasitics for resonant converters a. Hence an offtheshelf transformer lies at the heart of the llc converter. Conclusion highvoltage and transformer design transformer design is critical for flyback isolated designs webench tools can help you design your customized transformer using the tool you can prototype and manufacture your transformer rapidly 51. Index termsmagnetic shunt, llc resonant converter, planar transformer, high frequency, wide input voltage. High performance resonant mode controller with integrated highvoltage drivers the ncp97 is a high performance controller that can be utilized in half bridge resonant topologies such as series resonant, parallel resonant and llc resonant converters. Battery charger using hybrid resonant and pwm technique hongmei wan abstract the battery charger plays an important role in the development of electric vehicles evs and plugin hybrid electric vehicles phevs. Highfrequency llc resonant converter with gan devices and. Resonant transformer the equivalent circuit of a high voltage testing transformer consist of the leakage reactances of the windings, the winding resistances, the magnetizing reactance and the shunt capacitance across the output terminals due to the bushing of the high voltage terminal and also that of the test object. High conduction loss and switching loss will be resulted from wide input range. Using transformer parasitics for resonant converters 225 fig.
For voltages higher than 400 kv, it is desired to cascade two or more. Hfc0100 is a peak current mode controller that integrated with a high voltage current source. The switching loss is similar to that of pwm converter at high input voltage. Pdf analysis of high voltage high power resonant converters. High efficiency resonant dcdc converter for solar power. Both of these converters regulate their output voltage by changing the frequency of the driving voltage such that the impedance of the resonant circuit changes. An10881 tea17 resonant power supply control ic with pfc. Design guidelines for quasiresonant flyback converters using hfc0100 application note prepared by lei miao jan. Optimal design and comparison of highfrequency resonant and. The 2x matched capacitor value causes no resonant rise at 50hz and the final voltage is equal to what the open circuit voltage of the transformer would normally be. In lowvoltage systems resonant techniques might be undesirable, since high voltages. Improved high voltage resonant controller datasheet production data features 50% duty cycle, variable frequency control of resonant half bridge high accuracy oscillator up to 500 khz operating frequency twolevel ocp.
Piezoelectric nonresonant transformer to measure high. High frequency converters operating from high voltage input sources stand to gain significant improvements in efficiency with this technique. Snubber circuits suppress voltage transient spikes in multiple output dcdc flyback converter power supplies nov 12, 2001 abstract. The resonant transformer consists of air cored primary and secondary coils housed in a.
Although these features may make the parallel resonant converter illsuited to some conventional power supply applications, they can be used to advantage in others. The resonant condition is immediately disrupted when a. A finite element model of the partialcore resonant transformer is developed by adopting the model for fullcore shelltype transformers. Phaseshiftedfullbridge,zerovoltage transition design. And9408 basic principles of llc resonant half bridge. This paper presents the operational characteristics of a high voltage flyback converter with resonant elements. It supplied 115kvar of reactive power compensation at 23kv.
A resonant transformer for high voltage testing of generator stators article pdf available in australian journal of electrical and electronics engineering january 2003 with 2,326 reads. Resonant transformers series resonant ac test system. Together with the tea19162t pfc controller and the tea1995t dual sr controller, a. Threephase highfrequency transformer isolated soft. Especially, the seriesparallel resonant converter, fig. The dgd2110dgd21 high voltage gate driver ic provides the drive to the highside and low side gate of the mosfets. Once both stages have been activated, the controllers are supplied also by the auxiliary winding of the resonant transformer, assuring correct. Together with the tea19162t pfc controller and the tea1995t dual sr. The secondary diode d 1 is biased inversely hence no energy is transferred to the secondary side. By resonance, the decrease in the weight of transformer.
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