A novel application of zerocurrentswitching quasiresonant. When the switch is turned on, an approximately halfsinusoidal waveform of current flows through the switch, transferring a quantized energy packet from the input source to the lc circuit. Apr 23, 2012 optimal digital power control using llc resonant converters april 23, 2012 embedded staff the authors describe a digital power control implementation using line level control llc resonant converters based on a flexible, 32bit, lowcost, highperformance microcontroller. Interleaved zcs boost dcdc converters using quasiresonant. Operation and design 4 application note an 201209 v1. The technique of resonant converters is described below giving the zcspushpull resonant converter as an example. The main switch and auxiliary switch operate at zcs turnon and turnoff conditions, and all uncontrolled devices in the converter operate at zerovoltageswitching zvs turnon and turnoff. It truly is a typical converter that sticks out from the other demand briskness and comfort amid information change. The resonantreset forward converter is most suitable for this design because it lets us maximize the duty cycle.
The second part consists of an auxiliary circuit to provide zcs on the switch sm. In voltagemode resonant switching, the resonant capacitor is connected directly in parallel with the switch, ensuring zerovoltage switching. This is known as zerocurrent switching zcs, which minimizes the. Optimal digital power control using llc resonant converters april 23, 2012 embedded staff the authors describe a digital power control implementation using line level control llc resonant converters based on a flexible, 32. To compute the optimal values of resonant converter by applying the characteristic curve and mathematical calculation from the circuit configuration. Llc resonant converter reference design using the dspic dsc duration. This paper proposes a structure based on the association of two twoswitch forward converters connected to a single highfrequency transformer, whose operation is analogous to the conventional fullbridge topology. Several items common to most designs will not be highlighted, for example, primary to secondary isolation and. Assume an initial condition of the voltage vc across c equal to zero. For the zero current switching technique, the objective is to use. Designing singleswitch, resonantreset, forward converters. To propose soft switching buck converter with zcs for its switch using as simple circuit as possible. At this mode, switch s2 is turned on and the capacitor cc is charged through the resonant circuit.
The technique of resonant converters is described below giving the zcs pushpull resonant converter as an example. However, one can achieve better operating efficiency of the overall system by using a lowcost microcontroller to adjust the frequency, duty cycle and deadband. In this case, both transformer and output filter inductor are designed for twice the switching frequency. Optimal digital power control using llc resonant converters. A new zvzcs isolated dual series resonant dcdc converter. The main difference is that a resonant lc circuit has been added as a resonant tank around the switch in order to create a soft switching situation. Jun, 2017 this paper proposes a structure based on the association of two two switch forward converters connected to a single highfrequency transformer, whose operation is analogous to the conventional fullbridge topology. Do you think that converting the format of an audio file is difficult. The main purpose of this paper is to develop a novel application of a resonant switch converter for battery chargers. Resonant converter drivers are designed to adjust the switching frequency of the halfbridge to regulate the output. In this project a detailed study of zero current switching buck converters is. Zcspwm flyback converter for low voltage high current.
In order to reduce the switching losses in associated with conventional converters. The proposed converter considered as a zerocurrentswitched quasiresonant converter zcsqrc. By using a resonant pulse, the switching element will naturally go into a zero current state, at which point the fet is turned off zcs avoiding switching loss. Convert and encode audio files between over 40 different audio file formats with switch audio converter. Quasiresonant control with xmc infineon technologies.
In theory, the onoff transitions occur at a time in the resonant cycle where the switch current is zero, facilitat3329 ing zero current, hence zero power switching. The converter consists of a fullbridge mosfet bridge, a resonant tank represented by the lr inductor and cr capacitor block, a fullbridge rectifier and an output filter co. Feb 04, 2014 in order to reduce the switching losses in associated with conventional converters. By using resonant converter it can be able to get wide load range. The dual resonant tanks are composed by the leakage inductors and resonant capacitors to achieve zerocurrentswitching zcs turnoff mechanism for diodes at the secondary side of transformer. Apr 24, 2012 resonant converter drivers are designed to adjust the switching frequency of the halfbridge to regulate the output. Resonantreset forward converter with an input range of ground to 48vout 36v to 56v and output range 4v to 18v. Resonant and softswitching techniques in power electronics. Seriesconnected forwardflyback converter 9 and frequencycontrolled resonant flyback converter 10 achieve zcs turn on of switch, but the switch is hard switched at turn off instant. It truly is a typical converter that sticks out from the other demand briskness and. In most of these converters some form of lc resonance is used, that is why these are known as resonant converters. In current mode, the resonant action is initiated by the closing of the switch, and it ensures zero current zcs at the time the switch turns on.
Digitally controlled zvs quasiresonant boost converter with. Abstract a softswitching converter with dual resonant structures is presented in this paper. Llc converter is also an isolated dcdc converter but it has problem to achieve wide range application ref 2. The proposed converter considered as a zerocurrentswitched quasi resonant converter zcs qrc. Switch audio file converter is an audio file format converter for windows. Study and design of a zero voltage switched boost converter. Resonant switched capacitor dcdc converter with stackable conversion ratios by jikang chen research project submitted to the department of electrical engineering and computer sciences, university of california at berkeley, in partial satisfaction of the requirements for the degree of master of science, plan ii. Constant frequency zerovoltageswitching multiresonant. The buck resonant converter replacing the switch by the resonanttype switch, to obtain a quasiresonant pwm buck converter it can be shown that there are four modes of operation under the steadystate condition fig 6. Analysis of zvszcs softswitching dualresonant converter. The converter circuits which employ zero voltage and or zero current switching are known as resonant converters. The peak resonant voltage appears across the switch but the peak switch current remains the same as in its switch mode counterparts. Convert audio files tofrom all audio formats with switch.
Using the resonance phenomenon, the voltage or current on the device in the switching converter is changed in a sinusoidal manner, thereby creating a condition of zvs or zcs, called a resonant converter. Each forward converter employs a soft switching cell that allows the. The resonant converter broadly classified into eight types. Analysis, design and implementation of zerocurrentswitching. This consists of auxiliary diodes d 2, d 3, the resonant inductor lr, the resonant capacitor cr and the auxiliary switch sa. That capability is necessary if the output voltage is to be properly controlled from high levels down to 4v. Zvs topology where the switch turns on and turns off at zero voltage. At this mode, switch s3 is turned off and the current is flowed to the load.
Single switch zcs resonant converter with high stepup ratio. The dcdc buck converter receives the energy from the input source, when the switch is turnedon. The zcspushpull resonant converter the converter works as follows. A resonant converter will be measured and will be compared to the hardswitched converter to see if the common belief that softswitched converter have reduce power switching losses.
The zcs pushpull resonant converter the converter works as follows. Download it once and read it on your kindle device, pc, phones or tablets. Apr, 20 the resonant converter broadly classified into eight types. A zerocurrentswitching zcs converter with a quasiresonant converter qrc was used as the main structure. In theory, the resonant converter should yield a more compact design with the capability of power switching losses. Ecen 5817 resonant and softswitching techniques in power electronics spring 2014 schedule. Zvs depends on tank current zero crossings with respect to transistor switching times tank voltage zero crossings operation below resonance. Change your point of view with switch, just add the files. A resonant switch represents a sub circuit consisting of semiconductor switch s1 and resonant elements l r1, and c r1. In most of these converters some form of lc resonance is used, that is. Design and development of push pull dcdc converter by. It can convert audio files from many different file formats into mp3 or wav files, including wav to mp3, au to mp3, aiff to mp3 and much more. Resonant switched capacitor dcdc converter with stackable.
Dc link inverter are different resonant converter and in this zcs and zvs topologies should be used and it have their own limitations that peak switch current is higher min of two times its square wave counterpart to the zcs zero current switching which is having significant power loss at high frequencies and high voltage. However, one can achieve better operating efficiency of the overall system by using a lowcost microcontroller to. A soft switching zcszvs double twoswitch forward converter. To simulate the zcs resonant buck converter using orcad capture. Soft switching techniques are used in pwm dcdc converters to reduce switching losses and electromagnetic interference emi. Principle of operation the operation for the converter system is explained as follows. Moreover, the voltage stresses of power switches are clamped. In this paper is to design a push pull converter, which can. Quasiresonant, zerocurrent switching dcdc converters 2 of 3 the converter consists of the following primary elements. Crm operation reduces switching losses of main switches at turnon of them and zerocurrent switching zcs of the output diodes reduces also switching losses and alleviates reverse recovery problem of output diodes. Seriesconnected forwardflyback converter 9 and frequencycontrolled resonant flyback converter 10 achieve zcs turn on of switch, but the switch is. An offline 150 watt, single output design has been selected as a typical application for the purposes of this paper. Convert a single audio file, a playlist or a large batch of files.
26 777 1426 209 76 1520 508 478 97 887 1170 1355 1438 545 523 148 224 32 714 427 536 5 934 565 1163 788 1131 618 160 422 381 1287 764 330 617 1207 713 680