What is the basic information about switching power supply?

For switching power supplyis not unfamiliar to everyone, it is very widely used, and has the advantages of stable and reliable voltage, low power consumption, high conversion efficiency, so it is mostly used in television equipment. For example, optical amplifiers, digital satellite receivers, modulators, and other equipment are used in switching power supply. Next, we will introduce the basic information about it.

Here is the content:

1.Working Principle

2.The operating modes

3.Composition

Working Principle

The switching power supply allows the power transistor to work in two operating states, on and off, which is achieved by chopping the input DC voltage amplitude into a pulse voltage equal to the input voltage amplitude. Its working principle is that the voltammetry product on the power transistor is very small (on state, low current, large current, off state, high voltage, low current), that is, the loss generated on the power transistor is very small.

The operating modes

Switching power supply generally has three modes of operation: frequency, pulse width fixed mode, frequency fixed, pulse width variable mode, frequency, pulse width variable mode. Frequency, pulse width fixed mode: This mode is mainly used for DC/AC inverter power supply or DC/DC voltage conversion. Frequency fixed, pulse width variable mode: This mode is mainly used for switching voltage regulator power supply. And frequency, pulse width variable mode, mainly used for switching voltage regulator power supply.

Composition

Switching power supply consists of main circuit, control circuit, detection circuit and auxiliary power supply. The main circuit has the following functions. Surge current limiting: limits the surge current at the input side when the power is switched on. Input filter: it is used to filter the clutter existing in the power grid and prevent the clutter generated by the machine from being fed back to the power grid. Rectification and filtering: direct rectification of ac power supply to smooth DC. Inverter: the direct current after rectification into high frequency ALTERNATING current, which is the core of high frequency switching power supply. Output rectifier and filter: provide stable and reliable DC power supply according to load requirements.

The role of the control circuit is to sample from the output, compare with the set value, and then control the inverter and change its pulse width or pulse frequency to make the output stable. According to the data provided by the test circuit, identified by the protection circuit, provide the control circuit for various protection measures for the power supply. The test circuit is responsible for providing various parameters and various instrumentation data for the protection circuit being operated. The auxiliary power supply is responsible for realizing the power supply software (remote) start, protection circuit and control circuit, and other work power supply.

The function of the switching power supply is to convert a bit of voltage, through different forms of architecture, into the current or voltage demanded by the user side. It is more energy-efficient and generates less waste heat. Zhejiang Ximeng Electronic Technology Co., Ltd. is a professional engaged in design, research and development, production, sales as one of the high-tech enterprises. It believes that our switching power supply can meet your requirements.