Analysis and design of llc resonant converter with integrated transformer hangseok choi fairchild semiconductor 823, dodangdong, wonmigu bucheonsi, gyeonggido, korea abstract llc resonant converter has a lot of advantages over the conventional series resonant converter and parallel resonant converter. The dc power bus has a relaxation oscillator that generates a symmetric triangular waveform, to which. Avec son interface simple, vous propose des conversions en pdf instantanees, illimitees et securisees. Abstract a capacitor charging power supply has to perform under wide range of load variations.
Ferroresonance is usually associated with potential transformers, which are instrument transformers that are used to develop voltages used by relays. A highvoltage transformer in which the secondary circuit is tuned to the frequency of the power supply. A 60hz transformer that puts out 12kv neon or pole transformer types with 240v in will easily approach 50100kv or more near resonance, and fry itself in the process. Wireless power transfer using resonant inductive coupling for. The series and parallel resonant converters, and zerovoltage switching 4. A spark gap in this position will improve the performance dramatically and amplify the power gain. This transformer steps up the 240 or 120vac voltage from the mains, to about 1800 to 2200vac for use in the magnetron to generate microwaves. Understanding piezoelectric transformers in ccfl backlight. This tool enables you to convert any type of pdf into editable formats with the original layout and formatting retained. When the switching network is combined with resonant tank it forms a resonant inverter.
Resonance transformer article about resonance transformer. The output voltage of the resonant converter is very small due to the short circuit made with full resonance. In the resonant charging system energy sloshes back and forth between the ballast inductance and the tank capacitor building on every cycle as power is supplied by the transformer. Tech data on non resonant and resonant loads this plasma driver system can drive both non resonant resistive and complex resonant loads.
The tertiary winding excitation winding of first stage has the same number of turns as. The iris40xx series of integrated switchers are designed primarily to be used in the quasiresonant mode which means that the transformer will be operating in a discontinuous mode the magnetic field is not continu. Resonant converter with fullycompensated isolation. Thakurta power supply division, centre for advanced technology, p. Click the upload files button and select up to 20 pdf files you wish to convert. Study of transformer resonant overvoltages 771 fig. Multielement resonant topology based on lclc circuit.
Greek god of lightning, and as a play on words referencing the sousaphone. The position of the capacitor in this device has to be the position of a spark gap. Up to 800w output power in a compact and thermalwise design. The inductor lr, capacitor cr forms a resonant converter. A new design of partialcore resonant transformer is arrived at, having an alternative. This intuitive, versatile, multilingual tool enables you to easily convert pdf file of any type into editable formats with the original layout and formatting retained. This example is an actual laboratory measurement of a small 1. By combining the basic resonant circuits rise modified multielements resonant circuits. Resistive non resonant loads the advantage of a straight resistive load is that the amount of voltage the load sees is dictated by the turns ratio of the transformer. To do so, a switch network typically produces a squarewave voltage that is applied to a resonant tank tuned to the fundamental component of the square. As a result, the circuit and complex transformer are driven with a halfbridge. Pdf a resonant transformer for high voltage testing of. Efficiency optimization of llc resonant converters. En quelques secondes, transformez gratuitement vos documents et obtenez des pdf dune haute qualite.
Analysis and design of resonant charging system dtic. Power transformer testing relay microsoft excel an excel spreadsheet is available on the website to simplify the process. In this paper, we focus on a special phenomenon where excessiveovervoltagesarise due to resonance. Resistive nonresonant loads the advantage of a straight resistive load is that the amount of voltage the load sees is. You can also create pdf directly from microsoft office applications with just one clock, combine. Furthermore, the converter is naturally short circuit proof. Experimental results obtained for a resonant converter with resonant frequency fg 35. Aeries resonant converter and b its ideal equivalent circuit. A capacitor charging power supply using series resonant topology. We designed the complex resonant transformer and describe in this paper a simulation model that is highly important, thus to exploit its frequencydependent transfer characteristics. Its useful to contrast the behavior of an unloaded transformer energized at rated voltage figure 2, with that of the same transformer with a capacitor placed in series with the source figure 3. How to determine resonant frequency of a transformer. Simple frequencydomain modeling of resonant converters with the fundamental approximation 3. Analysis and design of llc resonant converter with.
The primary of the first stage transformer is connected to a low voltage supply. The microwave oven transformer is a normal, large, laminated iron core transformer found in microwave ovens. Cranmer compiled the first book of common prayer, writing some of the most resonant phrases in the english tongue allen d. The group of resonant and quasi resonant topologies consists of serial, parallel and serialparallel resonant circuit.
Mar 25, 20 to push high efficiency and high power density for high output current applicaiton, matrix transformer and flux cancellation are utilized in llc resonant converter. A seriesparallel resonant converter for electrochemical wastewater treatment kathryn m. Resonant converters use two kinds of the switching technique. The characteristics of the dc power bus are variable frequency at both heavy and medium or light loads. Tech data on nonresonant and resonant loads this plasma driver system can drive both non resonant resistive and complex resonant loads. Huge arcs from a single resonant microwave oven transformer. Mehdi mohammadjafaria et al contactless energy transmission system cet via magnetic resonant indian j. 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. We designed and implemented a power converter to provide a dc power bus for the mcor 12 correction supply.
Special transformers and applications transformers. Study of transformer resonant overvoltages caused by cabletransformer highfrequency interaction bjorn gustavsen, senior member, ieee abstractpower transformers can fail from dielectric stresses caused by electromagnetic transients. To push high efficiency and high power density for high output current applicaiton, matrix transformer and flux cancellation are utilized in llc resonant converter. Wireless power transfer using resonant inductive coupling.
Pdf in this paper, a highefficiency high power density llc resonant converter with a matrix transformer is proposed. By arranging the ferro resonant tank circuit in the secondary and by choosing proper magnetic properties of the core, transformer can produce the constant voltage in secondary for a varying input voltage across the primary. And9408 basic principles of llc resonant half bridge converter. Several topologies exist for the resonant power stage shown in figure 8. They are also used in some types of switching power supplies. These characteristics match the working requirement of the correction supply.
This free online pdf to doc converter allows you to save a pdf file as an editable document in microsoft word doc format, ensuring better quality than many other converters. 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 10kv. 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. Llc resonant converter with matrix transformer youtube. Subintervals and modes the series resonant converter, fig. Input voltage range, lamp characteristics, and pzt characteristics determine the correct resonant power stage topology. This paper presents the dcdc converter with resonant commutation. Resonant inductive coupling or magnetic phase synchronous coupling is a phenomenon with inductive coupling where the coupling becomes stronger when the secondary loadbearing side of the loosely coupled coil resonates.
We obtained a power bus with small ripple to provide the correction power. The resonance energy device works with radio speeds above 20 khz. Converters using extended fundamental frequency analysis jurgen biela johann w. Resonant transformers are also used in electronic ballasts for gas discharge lamps, and high voltage power supplies. It is to be noted that the individual stages except the upper most must have threewinding transformers. 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. An ipos llc resonant converters contains multiple dcdc modules, and each module requires a transformer, and these transformers can account for a large part of the whole converter loss, thus the. The proposed method allows an easy design of the integrated transformer and the calculation of the losses of all. 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. The described converter employs a low profile high frequency transformer, a lcl resonant tank and two full bridge converters.
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. Some of the more popular choices are the pushpull, half bridge, and full bridge. Design of a power transformer for a llc resonant power. The energy is transferred to the load with the help of transformers when the resonant converter allows the current to circulate. Here the shortcircuit inductance value is an important parameter that determines the resonance frequency of the resonant transformer. Analytic design method for integrated transformers of. The device has no moving parts and is small in size. A capacitor charging power supply using series resonant. Resonant converter with fullycompensated isolation transformer. The resonance energy device explained preface this presentation is the result of more than two years of deep thinking about the resonance energy device invented by donald lee smith. Ferroresonance occurrence in power transformer photo by snc manufacturing co. A capacitor charging power supply using series resonant topology y. Llc resonant converter for battery charging application.
A tesla coil is an electrical resonant transformer circuit designed by inventor nikola tesla in. The group of resonant and quasiresonant topologies consists of serial, parallel and serialparallel resonant circuit. The new power converter systems contain a number of high power dcdc converters as main components. How to build a tesla resonant transformer by eric dollard. Kolar abstract the seriesparallel resonant converter and its magnetic components are analysed by fundamental frequency techniques. Jun 01, 2015 another form of resonant transformers is a constant voltage transformer.
A resonant transformer of this type is often used in analog circuitry as a bandpass filter. Efficiency optimization of llc resonant converters operating. Resonant inductive coupling is also being used in wireless power systems for. In fact, the llc converter exhibits an unmatched efficiency when implemented as a dcdc transformer, i. It can be seen that the instantaneous voltage vtt applied across the tank circuit is equal to the difference between the switch voltage vst and the rectifier voltage vrt. A voltage is available across the secondary of this transformer. The firing point of the rotary gap needs to be set so that a significant amount of energy is removed from the charging system whilst it is in the tank capacitor. The peak resonant inductor current is the sum of the reflected load current from 5 and the resonant current. I was interested in this device due to the huge amount of power which it is able to provide. Another form of resonant transformers is a constant voltage transformer.
A potential transformer is a conventional transformer having primary and secondary windings. A general design methodology for partialcore resonant transformers with. The circuit formed by and is excited by a unit step voltage, giving rise to an oscillating voltage at with. The upper most, however, will be a two winding transformer. Equivalent schematic of a real transformer left, tapped secondary.