Switching-Mode Power Supply (SMPS) Design

Upasana Dewan

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A majority of electronic DC loads like motors, LEDs and microprocessors need regulated source voltage levels which are not obtained from standard voltage sources. The Switched-Mode Power Supply (SMPS) is a power supply which has been widely used in computers, telecommunications and automobile systems to provide regulated power because of its high efficiency and versatility compared to linear regulators.
This article mentions some reference designs which can help you design SMPSs for wireless speakers, Power line modems and many more applications. Take a look!

500 Watt SMPS with Full Digital Control For IoT: 

smps nxp

This reference design explains a 500-watts SMPS fully digitally controlled by software. The control by a Digital Signal Controller (DSC) has many advantages for the design of power electronics systems like SMPS including programmability, reduced component count, design flexibility, excellent efficiency and better performance. This reference design uses a Freescale 56F8323 device to perform input power factor correction and full-bridge DC/DC power conversion. The system provides an output voltage of 48V DC, a power factor greater than 0.95, and a efficiency greater than 90 per cent. The design meets the requirements of an SMPS system by incorporating a high-level control of operating status in real-time and communication capability via RS-232. More on this Reference Design 

Double-output SMPS for Power Line Communications (PLC): 

This reference design introduces an innovative SMPS solution developed for power line communications that is capable of providing constant output voltage regulation. The design implements a wide-range double-output power supply, which provides a 13 V output voltage for power line modem (PLM) and the analog circuitry and a post-regulated 3.3V for digital circuitry and an external microcontroller. For constant output voltage regulation, the board uses the ALTAIR04-900, a quasi-resonant (QR) current-mode controller IC. The output power of the SMPS is 7.48 W. This design provides an extremely safe mode of operation during an output short-circuit in which case the output voltage is close to zero, while the output current is fixed to a constant value. More on this Reference Design 

300 Watts SMPS Reference Design based on dsPIC DSC: 

smps microchip

This SMPS Reference Design is well-suited for high power AC – DC conversion applications providing an output power rating of 300 Watts. To achieve this, the design utilises the features of dsPIC Digital Signal Controllers. The use of the dsPIC imparts digital control and makes the system more reactive to fault conditions. The digital control also reduces the BOM of the power supply compared to its analog 300W counterpart. The design works with universal input voltage range and produces three output voltages of 12V, 3.3V and 5V. The design is built in a modular structure having three major blocks: a front-end PFC Boost circuit, a Phase-Shift Zero Voltage Transition (ZVT) circuit that produces a 12 VDC output voltage and a Multi-Phase Synchronous Buck converter. More on this Reference Design

125 Watt SMPS for PC Speakers:

This reference design describes a small, low-cost SMPS for audio power amplifier applications such as wireless speakers and personal computer speakers. In addition to providing +28 Volts for audio power amplifiers, it also has +5.0 Volts and +12.0 Volts outputs for system functions. The SMPS is consistent with the noise and ripple requirements of audio amplifier systems. The SMPS incorporates a Power Supply Volume Control (PSVC) feature to improve the sound quality and system efficiency. This feature allows the control of amplifier volume by allowing the 28 Volt supply to vary from 7 Volts to 28 Volts by a PWM signal. Being an SMPS, the supply is light weight and generates less heat than a similar solution designed with a linear power supply. More on this Reference Design

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