The reference design demonstrates peak present management in a ZVS Full-Bridge topology with digital slope compensation for effectivity and decreased software program overhead.
The facility electronics trade more and more calls for greater effectivity, reliability, and energy density. This demand has spurred the fast growth of digital energy options, notably within the telecommunications and server energy sectors. Digital management of energy provides has been a broadly mentioned and debated subject for years. The combination of refined peripherals for energy provide administration into microcontrollers and the appearance of superior high-speed units within the semiconductor trade has facilitated larger adoption of digital energy applied sciences. Methods beforehand dominated by analogue options are actually achievable with digital strategies. In gentle of those developments, the reference design from Microchip demonstrates the appliance of peak present management inside a ZVS Full-Bridge topology, using a totally digital slope compensation method that minimizes software program overhead.
The 750W AC-DC Reference Design encompasses a semi-bridgeless PFC topology adopted by a peak present managed zero-voltage switching full-bridge (ZVS FB) converter with digital slope compensation for very excessive conversion efficiencies. This energy provide helps firmware updates, together with the compensator algorithm, with zero downtime to the system it powers whereas operational. It makes use of two dsPIC33EP “GS” digital-power DSCs for full digital management of the ability conversion and all system administration features.
The ZVS FB Converter is engineered to cut back an enter DC voltage of 400V to an output DC voltage of 12V. A particular facet of the reference design is its implementation of peak present management by way of a totally software-based slope compensation algorithm, which prevents the necessity for exterior analogue parts for slope compensation. The design is obtainable royalty-free below the phrases of the licensing settlement.
The design boasts full digital management and a standardized 1U type issue, that includes a 20 ms minimal hold-up time to compensate for drop-outs throughout UPS step-in. It consists of each below/overvoltage lock-out and adaptive management. A peak current-controlled ZVS Full-Bridge Converter makes use of distinctive adaptive digital slope compensation software program. Moreover, the system demonstrates the potential for on-line firmware updates (Reside Replace) on each the PFC and DC-DC converter levels, enhancing performance and efficiency with out downtime.
The ZVS FB Converter is also used in server and telecom energy provides, battery chargers, and renewable vitality functions, primarily attributable to its high-efficiency operation and easy management mechanisms. Usually, this topology employs both Common Present mode management or Voltage mode management, necessitating a capacitor in collection with the transformer to avert flux strolling.
Nonetheless, the implementation of peak present management eliminates the necessity for the collection capacitor by way of dynamic flux balancing. This method addresses subharmonic oscillations, frequent in obligation cycles over 50%, by integrating a slope compensation ramp that’s both added to the inductor present or subtracted from the height present reference produced by the voltage loop compensator. Peak present management, primarily an analogue method, is applied utilizing parts similar to linear amplifiers, transistors, RC networks, analogue comparators, or by way of devoted Utility-Particular Built-in Circuits (ASICs).
Microchip has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has further knowledge in regards to the reference design. To learn extra about this reference design, click on right here.
