Comparison between phaseshift fullbridge converters with. For highcurrent applications the currentdoubler topology. High efficiency currentdoubler rectifier with low output current. For high output current and low output voltage applications, half bridge in primary and current doublers in secondary are proved to be a very good solution. The greinacher voltage doubler is a significant improvement over the villard circuit for a small cost in additional components. An alternative rectification technique for pushpull and bridge converters by laszlo balogh this design note describes an alternative rectification method which offers simpler structure and better utilization of the isolation transformers in. State of the art topologies and improvements vtechworks. In particular, the transformersecondary copper losses are evaluated. If you correctly design the current doubler topology to preserve the same currents in the primary side, you end up with a much higher output inductor compared with the center tap. Efficiency and voltage characteristics of the bidirectional current.
This chapter introduces the principle of operation by describing the different phases of the current flow through the circuit on a simplified schematic. Research and modeling of the bidirectional halfbridge. It requires power supply with higher power density, lower profile and higher efficiency. Current doubler is a topology for secondary rectifier. The bidirectional halfbridge currentdoubler circuit is widely used in the lithium batteries formation for it can achievelowvoltageandhighcurrenttwowayflowofenergy. Application note 2222 lm5045 based 720w power converter. The common property of the pushpull, halfbridge and bridge topologies which makes the fullwave rectification necessary is that they utilize bipolar voltage. The mathematical focus of topology and its applications is suggested by the title. Current doubler rectifier for high power and low voltage dcdc converter applications. Guoying xu, haisheng yu, huachang zou, hao yang, and ming cheng. An active snubber circuit has been proposed for a currentdoubler topology in 17.
The current doubler rectifier cdr converter topology was invented and described in the early 1950s which can offer the unique characteristic of halving the. It is widely used for low voltage, high current applications because of reduced transformer winding loss. Forwardflyback converter with currentdoubler rectifier. The secondary inductor of the first coupled inductor is coupled in series with one of the first and second rectifiers and the secondary inductor of the second coupled. Based on this topology, four different integrated magnetics structures are analyzed and compared with each other. The measurement results are available in the last section of the application note. The primary current is flowing through qa, t1, and qd as shown in figure 4. Current doubler for nonisolated smps all about circuits.
Lm5045 based 720w power converter utilizing currentdoubler topology on the secondary texas instruments application note 2222 ajay hari january 27, 2012 introduction the lm5045 based 720w reference board is designed to evaluate the performance of the current doubler topology the secondary side. A wide range of isolated topologies are available for the dcdc stage, but the. The design of the dcdc converter has many degrees of freedom, which complicate the selection of the best topology and the determination of the component values, resulting in the. Current doubler rectifier offers ripple current cancellation. Sichuan institute of solid state circuits, china electronics technology group corp. It has been shown that the current doubler is more e cient than the full wave topology. Voltage multiplier circuits explained homemade circuit. Current sharing of cdr in half bridge dcdc converter. The advantage of this rectification topology is to use an additional inductor to share the load currents other than two inductors in the current doubler structure. Uc2525 based 400w half bridge topology with current doubler in secondary heating issues. These are the notes prepared for the course mth 304 to be o ered to undergraduate students at iit kanpur.
Design of phase shifted fullbridge converter with current doubler rectifier 4 design note dn 201 v1. Zvs phase shift full bridge principle of operation phase 1 4 1 power transfer phase. Llc resonant current doubler converter semantic scholar. A wide range of isolated topologies are available for the dcdc stage, but the choice. This paper presents a currentdoubler rectifier with low output current. Pdf forward converter with currentdoubler rectifier.
This paper presents comparison between phaseshift fullbridge converters with noncoupled and coupled currentdoubler rectifier. Design of phase shifted fullbridge converter with current doubler. Topology investigation for front end dcdc power conversion for distributed power system by bo yang fred c. Advantages and disadvantages of this topology compared to the conventional forward converter are discussed. The power transfers from the vi source tank to the vt of the secondary pwm pulse source by way of transformer t1. Analysis of new bidirectional dcdc converter based on. The advantages of the proposed topology include higher voltage stepdown ratio suitable for lower output voltages, better current ripple cancellation resulting in lower output current ripple. The isl6752 daughter card features pulse by pulse curre nt limiting, and the isl6754 daughter card features a patented method for average current limiting that results in a brickwall current limit profile. An alternative rectification technique for pushpull and bridge converters by laszlo balogh this design note describes an alternative rectification method which offers simpler structure and better utilization of the isolation transformers in pushpull, halfbridge and bridge power stages.
When the secondary voltage is positive, the first diode d is forwardbiased and the primary capacitor c charges to approximately vp. A new coupledinductors currentdoubler topology is proposed in this paper. It is felt that it is inadvisable to attempt a definitive description of topology as understood for this journal. Us7149096b2 power converter with interleaved topology. Pdf inductor current sharing of current doubler rectifier in isolated. Since the output is 12v and 50a, current double rectifier with synchronous.
A full wave voltage doubler is a voltage multiplier with a multiplication factor of two. A nonisolated zvs selfdriven current tripler topology. The unique characteristics of the llccdr topology can offer significant improvements by transformation of a 48v converter into a. Certainly the subject includes the algebraic, general, geometric, and settheoretic facets. Design of phase shifted fullbridge converter with current. Complete steadystate analysis of a forward power converter with a currentdoubler rectifier is provided. There are many advantages that can be gained by using a current. Magnetics design for high current low voltage dcdc converter.
Lee, chairman electrical engineering abstract with the fast advance in vlsi technology, smaller, more powerful digital system is available. Current doubler resonant llc basic form of fullbridge, where primary fets are controlled by pwm at a fixed frequency. Isolated power topology derivatives 8 mainstream converter topologies nonisolated 1. New coupledinductors currentdoubler topology request pdf. The clamping capacitor clamps the voltage across sr1 and sr2, eliminating oscillations and absorbing the leakage energy when the srs are off. In high current capability and high stepdown voltage conversion, a phaseshift fullbridge converter with a conventional currentdoubler rectifier has the common limitations of extremely low duty ratio and high component stresses. Zhu et al lossless active clamping circuit for current doubler topologies 93 fig. Complete steadystate analysis of a forward power converter with a current doubler rectifier is provided. In one use of the term the energy is transferred to the load when the switching device is off, and i dont see it likely that the current doubler rectifier can be adapted to. Finer control over turns ratio is possible, because the secondary voltage of the transformer is higher and the current is doubled outside of the transformer.
Pdf research and modeling of the bidirectional half. Download pdf technical specification for dc power plant. Each coupled inductor has a main inductor inductively coupled with a secondary inductor. Design and performance evaluation of lowvoltagehigh. An2222 lm5045 based 720w power converter utilizing currentdoubler topology on the secondary. To emphasize the differences of power losses of the. Hence, considering 8 a 162 8 as the rms current, the cma ratings are now. Due to its high stepup voltage ratio, high utilization rate, and good stability, the bidirectional halfbridge currentdoubler topology is widely used in lithium battery system.
In the voltage doubler, the average input current is approximately twice the average output current. Whether it can be adapted to a buckboost topology, depends on which definition of buckboost you are using. The hybridge topology 3, also known as the current doubler topology, is well suited for lowvoltage highcurrent applications because the amplitude of the secondary and inductor current is approximately half the load current and the voltage lost by rectification is only one diode drop. The voltage doubler works similarly to the inverter. Optimization of a 5kw telecom phaseshift dcdc converter with. This paper presents a detailed analysis of the bidirectional current doubler rectifier cdr that is a candidate topology for use in power electronic transformer. The simplest form of the voltage doubler circuit are a type of rectifier which takes the input in the form of alternate current ac voltage and produces a double magnitude of dc voltage as the output simple diodes are used as switching elements and an input in the form of mere alternating voltage is used to drive these diodes in a switching state. Power topologies within this class would include the push pull, half bridge and full bridge. In addition to the current doubler topology, any other secondary side topology can be used for the secondary sides, such as the forward and centertapped topologies.
Typical topologies with a current doubler rectifier. Having a current doubler at the secondary leads to half the rms current in the secondary winding. Uc2525 based 400w half bridge topology with current. The isl675254eval1z printed circuit board pcb layout has also been greatly improved over the isl6752eval1z. Current doubler rectifier offers ripple current cancellation steve mappus system power abstract the current doubler rectifier is a popular alternate choice for the output stage of a buck derived power converter, which would otherwise use a conventional centertapped transformer with secondaryside, fullwave rectification. The proposed fullwave rectifier structure employs two cfoas and three enhancementmode nmos transistors. This paper will further analyze the bidirectional halfbridge currentdoubler topology.
New coupledinductors currentdoubler topology conference paper in pesc record ieee annual power electronics specialists conference 2. The characteristics of inductance will keep the current ip in the same direction. The ripple is much reduced, nominally zero under opencircuit load conditions, but when current is being drawn depends on the resistance of. However, the required output capacitance for the same output voltage ripple will be significantly lower. Current doublers have been widely adopted in highcurrent dcdc converters for their reduced conduction losses. It is proved that by the equations above that the total current ripple waveforms and load step response are identical in both the center trapped rectifier and the current doubler rectifier which are shown in fig. It is widely used for low voltage, high current applications because of reduced transformer winding loss and easy to implement magnetic integration concept. A novel halfbridge llc resonant current doubler converter llccdr is proposed in this thesis which can offer several performance benefits compared to conventional llcstandard rectifier design. Good transformer utilization lower primary current than. A novel topology for realizing voltagemode vm fullwave rectifiersinusoidal frequency doubler based on current feedback operational amplifiers cfoas and nchannel metaloxide semiconductor nmos transistors is proposed in this study. Phaseshifted fullbridge converter and current doubler application note document number. Advantages and disadvantages of this topology compared to the conventional.
Taking into account the fact that the current is not equal to the two times current inductance may lead to a greater transformer. In this thesis, the current doubler converter topology with its unique characteristic is evaluated as a complementary solution to improve the llc resonant converter performance, especially for the low output voltage and high output current telecommunication applications. A coupledinductor currentdoubler topology for a power converter has first and second rectifiers and first and second coupled inductors. A novel fullwave rectifiersinusoidal frequency doubler. Design of phase shifted fullbridge converter with current doubler rectifier. Figure 7 shows the topological stages of the proposed power supply during a. Energy e ciency investigation of a 3kw dcdc converter for.
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