L. BALOGH, "SLUA122 - The New UC3879 Phase Shifted PWM Controller Simplifies the Design of Zero Voltage Transition Full-Bridge Converters", Texas Instruments, Application Report, 1999, 9 pages.
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Titre : L. BALOGH, SLUA122 - The New UC3879 Phase Shifted PWM Controller Simplifies the Design of Zero Voltage Transition Full-Bridge Converters, Texas Instruments, Application Report, 1999, 9 pages.

Cité dans : [DIV095]  Librairie TEXAS INSTRUMENTS - UNITRODE et Notes d'applications diverses, octobre 2013.
Cité dans : [DIV302]  M. DENNIS, SLUA246 - A Comparison Between the BiCMOS UCC3895 Phase Shift Controller and the UC3975, Unitrode Products from Texas Instruments, Application Report, September 2000, 3 pages.

Date : 1999
Pages : 1 - 9
Lien : SLUA122.pdf - 275 Ko, 9 pages.

This Application Note will introduce the UC3879
integrated circuit and compare its performance to
its predecessors, the UC3875/6/7/8 controller fami-ly.
These integrated circuits provide all necessary
control, decoding, protection and drive functions to
successfully manage the operation of the full-bridge
converter with phase-shifted control. This
integrated solution greatly simplifies the design
procedure and offers significant savings in develop-ment
time and printed circuit board real-estate for
the designer.
Using the conventional full-bridge topology with
phase-shifted control technique has already
demonstrated its superiority in medium to high
power, DC-to-DC power conversion. This control
method provides well controlled dv/dt values and
zero-voltage switching of all primary side semicon-ductors
in the power stage over nearly all operating
conditions. Several publications [1-8] discussed the
details of operation including equivalent circuits for
the resonant transitions for both legs of the bridge
converter, conditions for zero-voltage switching and
describing further improvement possibilities. The
major benefits offered by this approach are a sim-pler
power stage than its hard switched counter-part,
utilizing circuit parasitics instead of being
penalized by them, improved efficiency and lower
EMI level. These significant advantages are realized
with a slightly more complex control algorithm.



[1] : R.A. Fisher, K.D.T. Ngo, and M.H. Kuo, "A 500 kHz, 250 W dc-dc converter with multiple out-puts controlled by phase-shifted PWM and magnetic amplifiers", Proc. High Frequency Power Conversion Conference, pp. 100-110.
[2] : L.H. Mweene, C.A. Wright and M.S. Schlecht, "A 1 kW, 500 kHz front-end converter for dis-tributed power supply system", Proc. APEC ’89, pp 423-432.
[3] : D.B. Dalal, "A 500 kHz multi-output converter with zero voltage switching", Proc. APEC ’90, pp. 265-274.
[4] : J.A. Sabate, V. Vlatkovic, R.B. Ridley, F.C. Lee and B.H. Cho, "Design considerations for high-voltage high-power full-bridge zero-volt-age- switching PWM converter", Proc. APEC ’90, pp. 275-284.
[5] : R. Redl, L. Balogh and N.O. Sokal, "A novel soft-switching full-bridge dc/dc converter: analysis, design considerations, and experi-mental results at 1.5 kW, 100 kHz", Proc. PESC ’90, pp. 162-172.
[6] : W.M. Andreycak, "Phase-shifted, zero volt-age- transition design considerations and the UC3875 PWM controller", Application Note U-136, Unitrode Product & Applications Handbook 1993-94, pp. 9.393-9.406.
[7] : W.M. Andreycak, "Designing a phase shifted zero voltage transition (ZVT) power convert-er", Topic 3, Unitrode Power Supply Design Seminar SEM-900.
[8] : R. Redl, L. Balogh and D.W. Edwards, "Optimum ZVS full-bridge dc/dc converter with PWM phase-shift control: analysis, design considerations, and experimental results", Proc. APEC ’94, pp. 159-165.
[9] : R. Redl, L. Balogh and D.W. Edwards, "Switch transitions in the soft-switching full-bridge PWM phase-shift dc/dc converter: analysis and improvements", Proc. INTELEC’93, pp. 350-357.

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