With the development of science and technology, modern intelligent equipment, such as computer, communication network and precision analytical instrument, is widely used. These modern electronic
devices are composed of a large number of integrated circuits. They are small in size, high in integration, powerful and expensive. They cause data loss or chip damage to the power grid. Therefore,
the power supply requirements of these devices are composed of microelectronic components must be configured more stringent, high reliability, fast reaction speed, instantaneous voltage range is very
wide, anti EMI ability and strong anti-interference band wide purifying regulated power supply in order to make it safe and reliable work, give full play to the performance and investment benefit
equipment.