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24 Threads found on Phase Shift Full Bridge
Hello, Do you believe that this ?Modified full bridge? SMPS (as in attached pdf schem and LTspice sim) is a good idea for when power is >500W? This full bridge has an extra added external ?leakage inductor?, -the reason for this is so that? 1?The secondary diodes have a much softer recovery (it?s as soft as if a (...)
Your fets not good for phase shift full bridge (PSFB). They have much Cds capacitance, and also, the internal diode is relatively slow?and you make this worse by paralleling there are two to reverse recover?.and also? use two, so there is even less I(FET)*Rdson voltage to reverse recover the intrinsic diodes with. For (...)
Hello, Please can you confirm that the use of a Unidirectional Current Sense Transformer (CST) as shown on the first page of the UCC28950 (phase shift full bridge converter) datasheet is totally wrong? (It is a phase shift full bridge converter and the (...)
Hello, Do you know how to avoid reverse recovery in intrinsic diode of the primary FETs of a phase shift full bridge converter during light load? The attached are the LTspice simulations (and schematics) of a phase shift full bridge (PSFB) converter, and (...)
Hello, This document (below) about phase shift full bridge (PSFB) converters, on page 21, states that a plain full bridge SMPS has a hard-switched turn off of the primary FETs. ?Which is true, but so too does the phase shift full (...)
Hi all I am investigating the response of a circuit in which two synchronous clocks with 180 phase shift are connected by two 10 kohm resistors and the output is the common signal between the two resistors. May anybody help please?
yes I worked in one place where they were doing a bidirectional "Dual Active bridge" converter.....its bidirectional. It operates like a "phase shift full bridge" SMPS but without the output inductor.....just uses the leakage........they thought it was the bees knees because it was bidirectional.....I (...)
Yes, as Velkarn says the phase shift full bridge converter sounds good, eg, as in this post spoken of by Easy Peasy And yes the LLC , good app notes are AN-4151 by fairchildsemi, and also the Infineon app notes on LLC converters. For your high current, if you are using circular section enamelled copp
Hello, The phase shift full bridge (PSFB) converter is a hoax. ?The LTspice simulation attached of a ?plain? full bridge SMPS bears this out. PSFB claims to be able to reduce switching losses compared to the ?plain? full bridge SMPS. However the PSFB (...)
full bridge SMPS. (I take it you couldn't find a 250v rated, 90uF capacitor to handle your 27 Amps of ripple current in your previous sepic attempt?...any suggestions here from readers may Help Maloth?) Your duty cycle at worst case is too high for a phase shift full bridge smps, and (...)
(ZVS phase shift full bridge CFD2 optimized design) The above app note, on phase shift full bridge converters, at the bottom of page 18, says?????. ?For safet
Hello, Here are simulations ( in the free LTspice) of a full bridge SMPS, and a phase shift full bridge SMPS. Why is it that the phase shift full bridge smps has a dc bias level in its magnetising current? (you can see (...)
Hello, Why aren?t all full bridge converters implemented as phase shift full bridge converters instead? I mean, control IC?s to manage the phase shift full bridge switching are very commonplace and cheap now. And the (...)
I think you are mixing several two without clearly specifying what you want to do. phase shifted bridge may be combined with resonant switching principles, but it's not directly related to it.
Hi, I would like to simulate fullbridge DC DC converter with the following parameters in LT spice with 95% efficiency. Here Iam doing synchronous rectification on the secondary side the delay between SA,SB and SC,SD is 50ns and overlap between M5&M6 is 100ns with dutycycle of 45%. but Iam getting efficiency around 85% (Pi=1887&Po=1608) but Iam ai
The phase shifted full bridge will give much lower CM-conducted RFI when done properly than a hard switched H bridge.
Hi, In the TI application note - 'Designing a phase shifted ZVT Power Converter' page3-6, it is mentioned that 'During the left leg transition, this situation reverses and the winding initially conducting full current decays to zero. The secondary which initially had zero current will conduct the full output current at (...)
You can achieve your goal by using phase shift full bridge or Resonant LLC topology rather than flyback topology . Most of the app notes are for buck converters to convert 400V to some 3.3 or 12V , it is very rare to find appnotes for your particular type of application. you need to design a transformer which can handle this (...)
the mains psu appears to be using a phase shift bridge 3525 won't be able to drive it, I think. @grizedale: As you apparently have the device at your fingertips - why don't you extract the full schematic?
Thanks to all. I propose to use ZVS phase shift converter. Sorry to say, is it UCC 3895? or UC3875? since I don't know UC3895 is it really difficult to obtain the good result by using 100khz ? Can anyone help me to design the high frequency transformer? any website is good? What is the difference between mosfet and power mosfet? What should
Hi... Has anyone has worked on TAB full bridge DC DC converter where power can be transferred from one port to another port by changing the phase shift of the square wave pulse to the switches of the bridge. I did a simulation but I obtained that power is transferred even when gate pulse sent to all the (...)
Hi The UCC3895 from TI implements a phase-shift controller for full bridge applications. The model includes various effects such as the adjustable dead-time but also the adaptative control. But ICAP8.1.6 can not open this model file.Please help to convert this higher version to ver8.1.6. thanks ynhe
two: 1.series resonant half bridge 2.and phase shift full bridge
it is like to full bridge phase shift soft switchmode power supply. Pls ref to this type smps topology.