lucysrausch / entropia-cc-smps

Switch Mode Power Supplies

This project aims to produce a number of SMPS circuits that use only a single inductor. As such they cannot be isolating, and are oriented to simple dc-dc conversions with a single output voltage or current. Low power circuits do not require current boost. Circuits of slightly higher powers use MOSFET current boost circuits. Switching frequencies are kept low to simplify PCB design, at the expense of high EMI. Input voltages are constrained to less than 30V for use in low voltage solar powered installations.

The circuits are intended to demonstrate basic SMPS operations and to investigate a range of issues such as management of EMI. In time it is hoped to provide useful working circuits.

• Buck Asynchronous MC34063. This is a very basic circuit taken mainly from the MC34063 datasheet.
• Buck Asynchronous MC34063 boosted with P-MOSFET. This extends the current range of the above circuit using a simple driver circuit.
• Buck Asynchronous MC34063 constant current circuit for driving LEDs.
• Buck Synchronous with digital ATMEL 8-bit microcontroller.
• Buck-Boost Synchronous full H with digital microcontroller control. This provides a template for building a range of experimental circuits up to moderately high currents.

More information is provided at Jiggerjuice.

(c) K. Sarkies 24/10/2014