Flyback SMPS Calculator

Flyback SMPS Calculator

Flyback SMPS Calculator is a tool for the design and analysis of flyback switching power supply (Flyback SMPS) circuits.

Flyback SMPS Calculator is a tool for the design and analysis of flyback switching power supply (Flyback SMPS) circuits. This online calculator helps engineers and designers by calculating the component values and performance of a Flyback SMPS circuit based on specific input parameters and output requirements. The Flyback SMPS Calculator supports the effective utilization of this switching power supply technology, which provides advantages such as high efficiency, low cost and compact design.

The Flyback SMPS or Flyback converter is a device that utilizes the principle of galvanic isolation between inputs and outputs to convert AC to DC or DC to DC.



Transformer VT Product
Voltage Primary
Voltage Out
Turns Ratio
Transformer Primary Inductance
Transformer Leakage Inductance
Diode Voltage Drop
Transistor Voltage Drop
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    How to Calculate a Flyback SMPS?

    The calculation of a Flyback SMPS (Flyback Switching Power Supply) is a highly complex process and usually requires the following steps to be followed:

    1. Determining System Requirements: The first step is to determine what type of application the Flyback SMPS will be used in and the expectations from the system. These requirements include factors such as input voltage, output voltage and current, efficiency, power factor, power density, etc.
    2. Determining the Turn Ratio: The slew rate of the flyback SMPS determines the ratio of the input and output voltages. This ratio is expressed as the ratio of the output voltage to the input voltage and forms the basis of the design process.
    3. Transformer Design Suitable for Slew Ratio: A transformer must be designed to match the specified turns ratio. This involves determining factors such as the number of turns, winding ratio and current density of the transformer.
    4. Switching Circuit Design: The switching circuit of the flyback SMPS manages a relationship between the transformer and the switching element (usually a MOSFET). The switching circuit controls and regulates the input and output voltages.
    5. Output and Input Filters: Input and output filters must be designed to reduce unwanted ripple, interference and noise. These filters usually consist of inductors, capacitors and resistors.
    6. Safety and EMC Compliance: During the design process, it is important to ensure that the Flyback SMPS complies with safety standards and electromagnetic compatibility (EMC) requirements.
    7. Component Selection and Simulations: In the final stage of design, the selection of appropriate components and simulations should be performed. This is important to evaluate the performance of the system under real-world conditions.

    These steps represent the basic processes generally followed in the calculation of a Flyback SMPS. However, Flyback SMPS design can be quite complex and require expertise. Therefore, it is usually performed by experienced engineers or specialists.

    What is a Flyback SMPS?

    Flyback SMPS (Flyback Switching Power Supply) is a type of switching power supply that converts electrical energy from one form to another. This type of SMPS is widely used in various applications such as industrial, commercial and consumer electronics.

    A flyback SMPS basically consists of a transformer and a switching element. The switching element (usually a MOSFET) controls the process of storing and discharging energy. The transformer provides the conversion of energy and converts the input voltage into output voltage according to a specific turns ratio.

    The advantages of such switching power supplies include high efficiency, compact size, light weight, wide input voltage range and low heat generation. These features make Flyback SMPSs preferred in many applications.

    Flyback SMPS are commonly used in areas such as electronic devices, power adapters, LED drivers, telecommunications equipment and industrial automation.

    How Does a Flyback SMPS Work?

    A Flyback SMPS (Flyback Switching Power Supply) provides the output voltage by converting the input voltage through a high frequency switching process. Here is a basic explanation of how a Flyback SMPS works:

    • Switching Circuit: The switching circuit of a Flyback SMPS usually uses a MOSFET transistor. This transistor performs the switching process by turning on and off with a specific frequency.
    • Input Voltage: An input voltage, either AC or DC, is applied to the switching circuit. This input voltage is usually pre-processed by a rectifier and filter circuit.
    • Transformer: The switching converter of the flyback SMPS contains a transformer. This transformer converts the input voltage into a high frequency AC signal.
    • Energy Storage: When energy is applied to the primary winding of the transformer, a magnetic field is generated and energy is stored. When the switching element (MOSFET) is removed from the circuit, the voltage induced in the primary winding increases due to the increase in the magnetic field.
    • Push Back: When the switching element is switched off, the magnetic field dissolves in the primary winding. In this process, the magnetic energy is transferred to the secondary winding and the output voltage is induced in the secondary winding. This process is called reverse repulsion.
    • Voltage Regulation: The output voltage is induced in the secondary winding of the transformer during the flyback process. This voltage is adjusted to the desired value by voltage regulation circuits and a stable output voltage is provided.

    These basic operating principles of flyback SMPS are used to obtain the desired output voltage by effectively converting electrical energy. This method provides advantages such as high efficiency, compact design and wide input voltage range.