Switch is very important, many people like to design some of their favorite things according to their own style, such as clothes, ah, talk about clothes, nowadays, in order to be a trend, deliberately cut out a few holes in their own clothes. Clothes can be this weird design, then switching power supply design works how you design. There is no more trendy design? Think don't hear switching power supply design you should naturally think of its working principle. In that case, let's learn about it!
Switching power supply is the use of modern power electronics technology, control the switching tube turn on and off time ratio, to maintain a stable output voltage of a power supply, switching power supply is generally by the pulse width modulation (PWM) control IC and MOSFET composition. With the development and innovation of power electronics technology, it makes the switching power supply technology is also in constant innovation. At present, switching power supply with small, lightweight and high efficiency is widely used in almost all electronic equipment, is today's electronic information industry rapid development of an indispensable power supply method.
Main application
Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, led lighting, industrial control equipment, communication equipment, electric power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, LCD monitors, LED lamps and lanterns, communication equipment, audio-visual products, security monitoring, LED light bags, computer cases, digital products and instruments. Computer chassis, digital products and instruments and other fields.
Principle of operation
The working process of switching power supply is quite easy to understand, in the linear power supply, so that the power transistor works in the linear mode, and linear power supply is different from the PWM switching power supply is to let the power transistor work in the state of conduction and shutdown, in the two states, the power transistor is added on the volts-ampere product is very small (in the conduction, the voltage is low, the current is large); shutdown, the voltage is low, the current is large. ; off, high voltage, low current) / power device on the volt-ampere product is the power semiconductor device on the losses incurred.
Compared with linear power supply, PWM switching power supply more efficient work process is through the "chopper", that is, the input DC voltage chopped into amplitude equal to the input voltage amplitude of the pulse voltage to realize.
Switching power supply Burt's diagram of the duty cycle of the pulse is regulated by the controller of the switching power supply. Once the input voltage is chopped into an AC square wave, its amplitude can be raised or lowered by a transformer. The output voltage value can be increased by increasing the number of secondary windings of the transformer. Finally these AC waveforms are rectified and filtered to obtain a DC output voltage.
The main purpose of the controller is to keep the output voltage stable, and its working process is very similar to that of a linear form of controller. This means that the controller's function blocks, voltage reference and error amplifier, can be designed to be the same as a linear regulator. Where they differ is that the output of the error amplifier (the error voltage) passes through a voltage/pulse width conversion unit before driving the power tubes.
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