Difference Between Linear Power Supply And Smps Pdf

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With the advancement of switching power supply technology, linear power supplies are less popular today but still find themselves indispensable in applications that require very low ripple and noise.

A switched-mode power supply switching-mode power supply , switch-mode power supply , switched power supply , SMPS , or switcher is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Unlike a linear power supply , the pass transistor of a switching-mode supply continually switches between low- dissipation , full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. A hypothetical ideal switched-mode power supply dissipates no power.

Linear Regulated vs. Switch Mode Power Supply

Linear power supplies are designed for low noise and are often considered quiet since there is no high-frequency switching. A linear power supply typically uses a large transformer to drop voltage from an AC line to a much lower AC voltage, and then uses a series of rectifier circuitry and filtering process to produce a very clean DC voltage. The disadvantages are weight, size, and low efficiency. Switching power supplies are designed for high efficiency and small size. They incorporate a switching regulator to convert electrical power efficiently. Switching DC power supplies regulate the output voltage through a process called pulse width modulation PWM. Using a PWM allows various topologies to be used such as buck, boost, forward converter, half bridge rectifier, or flyback depending on the output power requirements.

The topics discussed till now represent different sections of power supply unit. All these sections together make the Linear Power Supply. This is the conventional method of obtaining DC out of the input AC supply. The Linear Power Supply LPS is the regulated power supply which dissipates much heat in the series resistor to regulate the output voltage which has low ripple and low noise. This LPS has many applications. A linear power supply requires larger semiconductor devices to regulate the output voltage and generates more heat resulting in lower energy efficiency. Linear power supplies have transient response times up to times faster than the others, which is very important in certain specialized areas.

AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies

This article explains the basic concepts of linear regulators and switching mode power supplies SMPS. It is aimed at system engineers who may not be very familiar with power supply designs and selection. The basic operating principles of linear regulators and SMPS are explained and the advantages and disadvantages of each solution are discussed. The buck step-down converter is used as an example to further explain the design considerations of a switching regulator. It is important to choose the appropriate solution for the targeted application and to meet specified performance requirements, such as high efficiency, tight printed circuit board PCB space, accurate output regulation, fast transient response, low solution cost, etc.

The linear power supply and Switch mode power supply, both supplies DC power to electrical and electronic circuits but the similarities end here. The crucial factor which differentiates linear power supply and SMPS is the working procedure. The Linear power supply converts high voltage AC into the low voltage using a transformer and then converts it into DC voltage while the switched mode supply converts AC into DC first then transform that DC voltage into desired voltage. On the contrary, the linear power supply is used in high-frequency application such as Radio Frequency application etc. Another significant factor which creates the difference between these linear power supply and SMPS is size. The linear power supply is bulky while the SMPS is light in weight. This makes the SMPS portable and can be easily used anywhere while linear power supply can be used only for laboratory or big electrical and electronic circuit.


Comparative analysis between the switch mode power supply (SMPS) using IC Tlcn transformer based on power supply linear. To cite this article: A Azis H et al difference being its mechanism of action. For more details, can be seen.


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Switch mode power supplies differ from linear power supplies in how the primary AC voltage is converted into the output DC voltage. Switch mode power supplies use a power transistor to produce a high frequency voltage that is passed through a small transformer and then filtered to remove both the AC component and noise. Linear power supplies deliver DC by passing the primary AC voltage through a transformer and then filtering it to remove the AC component.

Everyday electronic devices, especially those with integrated circuits, require a reliable DC voltage source that can supply powers at all times without any hiccups. The power supply that you choose ultimately comes down to your requirements for efficiency, space, output regulation, transient response time, and cost. Linear regulators were the power supplies of choice until the s for converting alternating current AC into a steady direct current DC for electronic devices.

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Electronic Circuits - SMPS

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5 Response
  1. Roland B.

    The main difference between the switching power supply and the linear power supply is that the switching supply does not operate at normal power line.

  2. Rainero A.

    Power is the backbone of any electronic system and the power supply is what feeds the system.

  3. Preciosa P.

    Resume and curriculum vitae pdf excellence in business communication 9th edition pdf download

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