Reference design enables a secondary side MCU to control primary power

January 06, 2021 //By Jean-Pierre Joosting
Reference design enables a secondary side MCU to control primary power
AC-DC controller plus Inde-Flux™ transformer technology simplifies design, reducing size and cost with up to 60% savings of the bias supply area.

In modern offline AC-DC power systems, programmability and adaptive control offer the flexibility and intelligence needed by smart home devices to better interface with their power systems. In these systems, a secondary side microcontroller (MCU) is typically not capable of starting a system without the use of a separate bias power supply. A reference design from Microchip Technology solves this problem using the MCP1012 high voltage auxiliary AC-DC controller, demonstrating the ability to remove the independent bias power supply in many applications. The MCP1012 offline auxiliary device enables the system to transfer control of the power and duty cycle to a secondary MCU. The control between the system and the load can be more precise and purposefully coupled, through a design that can be simplified, reducing size and cost.

The reference design uses a patented isolation technique for isolated feedback. This patented isolation technique called Inde-Flux transformer technology is being licensed to Würth Elektronik eiSos. Inde-Flux technology is used in the Inde-Flux Transformer (Part Number 750318659), the first transformer made by Würth Elektronik eiSos using this IP and sold as part of Microchip’s 15-W MCP1012 offline reference design. This transformer combines the signal power and signal communication into one device, eliminating the need for optical feedback or an independent signal transformer. The option is also available to use more traditional approaches with a planar pulse transformer on the reference design, as well as the ability of the design to work with more traditional optocouplers and signal transformers. The secondary-side control is then enabled through a combination of the transformer and Microchip’s newly released MCP1012 AC-DC controller along with the SAM D20 series 32-bit MCU.


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