Switch Mode Power Supply Circuit Diagram Pdf

Switch Mode Power Supply Circuit Diagram Pdf

A switch-mode power supply (SMPS) is a type of power supply that uses a switching regulator to convert AC or DC input voltage to a regulated DC output voltage. SMPSs are used in a wide variety of applications, including computers, telecommunications equipment, and consumer electronics. SMPSs are more efficient than linear power supplies, which use a transformer to step down the input voltage and a rectifier to convert the AC input to DC. This efficiency improvement is due to the fact that SMPSs do not waste energy as heat in the transformer and rectifier. The basic components of a switch-mode power supply are a switch, a diode, a transformer, and a capacitor. The switch is typically a transistor or a MOSFET, which is used to turn the input voltage on and off. The diode is used to rectify the output voltage from the transformer. The transformer steps down the input voltage and provides isolation between the input and output circuits. The capacitor is used to filter the output voltage and provide a smooth DC output. The following diagram shows a simplified circuit diagram of a switch-mode power supply:

Switch mode power supply circuit diagram

The switch is controlled by a pulse-width modulation (PWM) controller, which generates a square wave output signal. The duty cycle of the PWM signal determines the average output voltage of the power supply. The transformer is used to step down the input voltage and provide isolation between the input and output circuits. The transformer is typically a flyback transformer, which has a single primary winding and a secondary winding with multiple taps. The number of taps on the secondary winding determines the output voltage of the power supply. The diode is used to rectify the output voltage from the transformer. The diode is typically a Schottky diode, which has a low forward voltage drop. This low forward voltage drop helps to improve the efficiency of the power supply. The capacitor is used to filter the output voltage and provide a smooth DC output. The capacitor is typically a ceramic capacitor or an electrolytic capacitor. The value of the capacitor determines the ripple voltage on the output of the power supply. SMPSs are available in a wide variety of sizes and power ratings. They are used in a wide variety of applications, including computers, telecommunications equipment, and consumer electronics. ## Benefits of Switch-Mode Power Supplies There are a number of benefits to using a switch-mode power supply over a linear power supply. These benefits include: *

Higher efficiency:

SMPSs are more efficient than linear power supplies, which can waste up to 30% of the input power as heat. This efficiency improvement is due to the fact that SMPSs do not waste energy as heat in the transformer and rectifier. *

Smaller size:

SMPSs are typically smaller than linear power supplies, which can be a significant advantage in applications where space is limited. *

Lighter weight:

SMPSs are typically lighter than linear power supplies, which can be a significant advantage in applications where weight is a concern. *

Less noise:

SMPSs generate less noise than linear power supplies, which can be a significant advantage in applications where noise is a concern. ## Applications of Switch-Mode Power Supplies SMPSs are used in a wide variety of applications, including: *

Computers:

SMPSs are used to power the internal components of computers, such as the motherboard, CPU, and graphics card. *

Telecommunications equipment:

SMPSs are used to power telecommunications equipment, such as routers, switches, and modems. *

Consumer electronics:

SMPSs are used to power consumer electronics, such as televisions, DVD players, and Blu-ray players. *

Industrial equipment:

SMPSs are used to power industrial equipment, such as robots, manufacturing equipment, and medical devices. ## Conclusion Switch-mode power supplies are an essential component of many electronic devices. They offer a number of benefits over linear power supplies, including higher efficiency, smaller size, lighter weight, and less noise. SMPSs are used in a wide variety of applications, including computers, telecommunications equipment, and consumer electronics.


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