When the load connected increases, more output current is drawn from the supply, causing an increase in power dissipation. The power dissipation is the linear regulator is given by the following equation: Foldback current limiting technique reduces the output voltage and output current linearly during overload and overcurrent conditions, bringing the power dissipation under limits.Ĭonsider a linear power supply with input voltage Vi, output voltage Vo and output current Io. Foldback current limiting method is one such overcurrent protection scheme. Several current limiting techniques are commonly employed to protect the linear power supplies from such faults. The occurrence of overcurrent, overload, and short circuit conditions can damage the linear power supplies and affect the total useful life of the power source. Foldback Current Limiting Technique in Linear Power Supplies It also protects the linear supplies from faults and overload conditions.
The foldback current limiting technique in linear power supplies is a technique used to keep power dissipation under safe limits. When discussing linear power supply, we can't ignore the linear voltage regulators and the associated power dissipation. A linear power supply is highly reliable and immune to electromagnetic interference, especially RF interference, making it an excellent choice for RF and microwave circuits. While the lightweight and highly efficient features of SMPS make it a constant element in consumer electronics, its counterpart, linear power supply, is more often found in radio frequency (RF) circuits. The major share of our voltage requirements are fulfilled by Switch-Mode Power Supplies (SMPS).
The foldback current limiting method trips down the power supply and the voltage output will be equal to zero under this condition. Under constant current limiting mode, the power supply never gets tripped down to zero.
The folding back of the output current in power supplies potentially reduces the thermal, electrical, and mechanical stresses in circuit components, extending the life of these components. The foldback current limiting technique in linear power supplies is a technique used to keep the power dissipation under safe limits.
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