Design and Detection Of The Main board’s Power Switch
Abstract:With the development of the electronic technology and the emerging of new power components, switching power supply has been widely used in computer, communications, electricity, home appliances and aerospace fields, achieving remarkable results. The purpose of this papers is to design and make a switching power supply based on control chip M51995AFP and PWM Control. This switching power supply could adjust the output voltage by using the duty cycle of PWM Control. Stable output purposes could be attained.
The objective of this graduation project's is to realizes the switch type power source plan and use into the alternating current supply stable situation. Elaborated a kind of mentality that using the pulse width modulation (PWM) the technical coordination high-speed electronic switch and the high frequency electronic transformer and the LC filter to realize the exchange switch type voltage-stabilized source. Compares the angle type exchange voltage-stabilized source with the traditional silicon-controlled rectifier. This type has high efficiency , small volume , low misalignment degree of distortion ,and it is very stable of output voltage and electric current and so on characteristics. This article Launches gradually from the mechanism of the exchange switch voltage-stabilized source, involves to the controllable sine wave producer, the triangular wave generator, the comparator, the pulse width modulation (PWM), the high-speed electronic switch, the voltage converter as well as the microprocessor and the peripheral Yuan part and so on. Then to debugs, the examination and so on also have a corresponding certain introduction, finally has given the conclusion which tests according to the design requirements.Key words: Switching Power Supply; Duty cycle; PWM