Integration and miniaturization of AC Power Supply
AC Power Supply with a small size, high efficiency and a series of advantages, in all kinds of electronic products have been widely used. However, because AC Power Supply control circuit is more complex, the output ripple voltage is high, so the application of AC Power Supply is also subject to certain restrictions.
The key to miniaturization of electronic devices is the miniaturization of the power supply, so it is necessary to reduce the losses in the power supply circuit as much as possible. AC Power Supply in the adjustment tube work in the switch state, there must be switching losses, and the loss of the size of the switching frequency increases with the increase. On the other hand, AC power supply in the transformer, reactor and other magnetic components and capacitance components of the loss, but also with the frequency increase.
Currently on the market AC power supply in the power tube using bipolar transistors, switching frequency up to several tens of kHz; using AC power Supply MOSFET frequency of up to several hundred kHz. To improve the switching frequency must use high-speed switching devices. For the megahertz switching frequency of the power supply can be used resonant circuit, this work is called resonant switch mode. It can greatly improve the switching speed, the principle of switching loss is zero, the noise is very small, which is to improve the AC Power Supply operating frequency of a way. The megahertz converter with resonant switch mode has been put into practical use.
The integration and miniaturization of AC Power Supply has become a reality. However, the power switch and control circuit are integrated in the same chip, must solve the problem of electrical isolation and thermal insulation.
AC Power Supply has the advantages of small volume, light weight, safe and reliable, high degree of automation and high efficiency and low noise. At present, the power system has gradually adopted this power system.
In the power system, AC Power Supply as relay protection, automatic devices, control operating circuit, lighting and audio signals and accident lighting and other power supply, power plants and substations are more important equipment. Since the AC Power Supply fault caused by the accident occurred, so the AC Power Supply reliability, stability, high demand. Most of the traditional AC Power Supply uses SCR rectifier. In recent years, many AC Power Supply manufacturers have introduced intelligent AC Power Supply, which has many advantages: safe, reliable, high degree of automation, with smaller size and weight, high overall efficiency and low noise, Power grid development needs, it is worth promoting the use.
At present, China's power system AC Power Supply is also used by the traditional phase control power to the modular AC Power Supply. AC Power Supply rectifier works: AC power access rectifier module, the filter and three-phase full-wave rectifier into DC, and then access the high-frequency inverter circuit, the DC conversion to high-frequency AC, and finally by the high-frequency transformer , Rectifier bridge, filter output after the smooth DC. This AC Power Supply is mainly composed of high-frequency switch charging module, centralized monitor and battery pack, etc., which charge module and centralized monitor with built-in microprocessor, a high degree of intelligence. When the AC Power Supply system is operating normally, the output of the charger runs in parallel with the battery pack and supplies power to the recurrent load.
AC Power Supply uses imported components and the international advanced full-bridge inverter flow technology from precision machining, so that the performance of the machine stable, more reliable quality. The machine has overvoltage, overcurrent, over temperature, short circuit, lack of automatic protection alarm function and soft start function. And can install time control and computer interface. DC output waveform for the high-frequency square wave, ripple factor "1%, pulse output frequency, duty cycle, opening time, pipe time can be set individually to speed up the coating deposition rate, increase the number of plating, refused to passivation, The glossiness of the surface and the core of the corners of the plating. And can reduce the loss of raw materials, electroplating industry to meet the various special requirements. AC Power Supply is water-cooled and easy to install. And equipped with remote control device, simple operation. Can take the load switch machine, reduce the cumbersome adjustment procedures.