How switching power works

The working process of the switch Power Supply is quite easy to understand, in the linear power supply, make power transistor in the linear model, and the linear power supply, PWM Switching Power Supply is to get the power transistor in the state of the conduction and shut off work, in the state of the two, and on top of the power transistor of v - product is small (in conduction, low voltage, large current; The product of voltammetry (high voltage, low current) on a power device is the loss on a power semiconductor device.

Compared with the linear power supply, the PWM switching power supply works more efficiently through the "chopper", that is, the input dc voltage into the amplitude of the pulse voltage equal to the input voltage amplitude to achieve.

adaptor

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 increased or decreased by the 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 the dc output voltage.
The main purpose of the controller is to keep the output voltage stable. That is, the controller's function block, voltage reference, and error amplifier can be designed to be the same as the linear regulator. They differ in that the output of the error amplifier (the error voltage) passes through a voltage/pulse width conversion unit before driving the power tube.Switching power supply has two main modes of operation: positive excitation transformation and boost transformation. Although the arrangement of their parts is very different, the working process is very different, and each has its advantages in specific applications.

Shenzhen Waweis Technology Co., Ltd. is a high-tech enterprise engaged in r&d, production and sales of notebook adapters. General business projects are intelligent product hardware and software development, sales; Domestic trade, import and export of goods and technologies. , the licensed business projects are: switch power supply, power adapter, linear power transformer, 3C digital products, security equipment, new energy products, power storage, backup power supply, charger research and development and production processing and purchase and marketing; Production and sales of electronic products, hardware products, molds, plastic products, air purifiers, instruments and meters, medical equipment, electrical appliances, communication products, LED lighting products.

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Una Yang