High-frequency switch power supply for Competence
Abstract:This paper has analyzed the development of the domestic and international high-frequency switch power and current situation, have studied the basic principle of the high-frequency switch power and high-frequency application in the communication system of switch power, it is practical in the high-frequency switch power of the programmer-controlled system of telecommunications to design one, in order to substitute traditional accusing of the power. System this regard IGBT as power switch device, is it move the whole bridge is it to go against, adopt pulse width modulate (PWM) technology to form, its switch frequency is 100KHz. PWM control signal produce by integrated controller UC3895, sample the feedback signal of the voltage in real time outputting, in order to is it output change of voltage to control, control circuit and main circuit is it isolate through the voltage transformer or the photoelectrical coupler to ask, design soft to start and is it is it protect the circuit to shed to pass. The experimental results show that the System can work safely and reliably.
Keyword:High-frequency switch power; Phase Shifting Control Full Bridge;PWM; MOSFET