hot key words：

Understand the development trend of industrial control equipment switching power supply, talent is very clear understanding of market demand, talent is more conducive to the company to make more accurate judgments to serve our customers. The ability to do what the customer wants, do what the customer does.

Let's take a closer look at the basic components of industrial switching equipment power supply, which is divided into four parts:

1) Main circuit: the primary circuit from the AC grid input to the DC output. It mainly includes input filter, rectification and filtering, inverter, output rectification and filtering.

(1) Input filter: Its function is to filter the clutter existing in the power grid, and also prevent the clutter generated by the machine from reacting to the public power grid.

(2) Rectification and filtering: The AC power supply of the power grid is directly rectified into a smoother DC power for the next level change.

(3) Inverter: The rectified DC power is changed into high frequency alternating current, which is the middle part of the high frequency switching power supply. The higher the frequency, the smaller the ratio of volume, weight and output power.

(4) Output rectification and filtering: According to the load demand, supply a stable and stable DC power supply.

2) Control circuit: on the one hand, sampling from the output, comparing with the setting specification, then operating the inverter, changing its frequency or pulse width, reaching the output stability, on the other hand, according to the data supplied by the test circuit, The maintenance circuit discriminates and supplies the control circuit to perform various maintenance measures on the whole machine. It includes an output sampling circuit, a reaction circuit, and a pulse width modulator.

3) Detection and maintenance circuit: The detection circuit has over current detection, over voltage detection, under voltage detection, over temperature detection, etc.; maintenance circuit can be divided into over current maintenance, over voltage maintenance, under voltage maintenance, clamp maintenance, overheat maintenance, Active restart, soft start, slow start and many other types.

4) Other circuits: such as sawtooth generator, bias circuit, optical coupler, etc.

Next, talk about the development trend of industrial control equipment switching power supply, the power of industrial control equipment switching power supply is much higher than linear power supply. This saves energy and is therefore loved by people. However, it also has shortcomings, that is, the circuit is complicated, the maintenance is difficult, and the pollution to the circuit is serious. The power supply is noisy and is not suitable for some low noise circuits. The skill pursuit and development trend of switching power supply can be summarized into the following five aspects:

1) Miniaturization, thinning, light weight, and high frequency. 2) High reliability.

3) Low noise. 4) Select computer-aided planning and manipulation. 5) Low output voltage skills.

The development of industrial control equipment switching power supply has always been related to the development of semiconductor equipment and magnetic components, high-frequency completion, high-speed semiconductor equipment and high-frequency electromagnetic components with excellent functions. Develop new high-speed equipment such as power MOSFETs and IGBTs, develop low-loss magnetic materials for high-frequency use, change the structure and planning methods of good magnetic components, improve the dielectric constant of filter capacitors, and reduce the equivalent series resistance. Regarding the miniaturization of industrial control equipment switching power supply, there has always been a huge advancement.

At present, the industrial control equipment switching power supply is widely used in electronic devices, such as various terminal equipments and communication equipments, which are dominated by electronic computers, which are small, lightweight and high-power. A power supply mode; small and lightweight requirements are imposed on the switching power supply, and the switching power supply is required to have higher power, better function, and higher reliability.

The continuous innovation of power electronics skills has made the industrial control equipment switching power supply industry have broad prospects for development. To speed up the development of China's switching power supply industry, we must take the road of technological innovation, and go out of the road of joint development of production, education and research with Chinese characteristics, and contribute to the rapid development of China's national economy.