New and Original Zxd3000 V5.6 V5.0 Communication Power Module for Zxdu68

ZXD3000 V5.0 V5.1 V5.6 Communication Power Rectifier Module

The internal switching rectifier generally adopts two-stage conversion form: first, the AC input is changed into direct current through the AC-DC rectification and filter circuit, and then into the corresponding direct current through the DC-DC link. Since the front-end rectifier and filter circuit is a combination of non-linear components and energy storage components, from the perspective of the power grid, the switching rectifier is equivalent to a capacitive load, which causes serious distortion of the grid power supply and is no longer a single The sine wave of the fundamental frequency causes harmonic pollution. This leads to accidents such as noise, malfunction, vibration, overheating, and even burnout. At the same time, it increases the loss of the power distribution system and transformers, increases the neutral current (harmonics), and seriously interferes with the normal operation of various radio communications. In addition, the grid-side power factor is generally 0.5-0.7, which brings an additional burden to the grid, causes a lot of energy waste, and reduces the operating efficiency of power generation and transmission and transformation equipment.

ZXD3000 V5.0 V5.1 V5.6 Communication Power Rectifier Module

In order to reduce the noise caused by the harmonic current at the input end of the AC-DC converter circuit and the harmonic "pollution" to the power grid, to ensure the power supply quality of the power grid, improve the reliability of the power grid, and to improve the power factor of the input terminal. To achieve the effect of energy saving and advocate "green power", power electronics research institutions in various countries have been studying methods to improve the power factor of AC-DC circuit input terminals and reduce input current harmonics since the 1960s. There are two main types of solutions proposed: none Source filter and active power factor corrector (APFC). Passive filter is a power frequency filter inductor connected in series between the rectifier circuit and the filter capacitor, or a resonant filter is connected to the AC side. Its main advantages are simplicity, low cost, and low EMI. The main disadvantages are size, weight, and difficulty. Obtain high power factor (generally not more than 0.9), work performance is related to frequency, load change and input voltage, etc. Active power factor corrector is a new technology developed in the past one to twenty years. It connects a DC-DC closed-loop switching converter between the rectifier circuit and the load. Its main advantage is that it can obtain a higher power factor. , Such as 0.97-0.99, even close to 1; THD is small; it can work in a wide input voltage range and a wide frequency band; the volume and weight are small; the output voltage can also be kept constant.