Wednesday, January 18, 2012
Switching Voltage Regulator. Principle of OperationSwitching regulator is a voltage regulator which operates in the switching mode. Most of the time a regulating element is either in a cutoff state at maximum resistance, or saturation state at minimum resistance, hence it can be viewed as a switch. In a switching regulator, the current from an unstabilized external source is fed to a storing element in short pulses, a storing element is usually an inductor; energy is accumulated in the process, and then it is released to a load in the form of electrical power but with a different voltage. The regulation is achieved through the control of pulses and intervals between them, ie pulse-width modulation. Switching regulators have higher efficiency than linear regulators. According to the relation between input and output voltages, switching regulators are divided into: DC-DC converters, DC-AC converters, AC-AC converters, DC-AC converters. According to the switch type: field-effect transistor, thyristor, bipolar transistor. And as a storage element, an inductor, a battery or a capacitor is used. Below there is an example of how a switching regulator can be used as a DC-AC converter, with an inductor as a storage element. In this converter, the switch is placed after the inductor. When the switch is closed, the source current flows through the inductor L increasing the current and accumulating the power. When the switch is open, the source current flows through the inductor L ...
http://www.youtube.com/watch?v=5sCFlfz-QAE&hl=en
