MOST(Ministry of Science and Technology) established a 200 million yuan special fund for power and electronics project, while the NDRC(National Development and Reform Commission) started recently special project in recent dispatch to promote the development of the power and electronic technology and the industry, including the application of device of industrialization, focusing on the demand of energy, traffic, electric power, metallurgy and other fields, supporting the application of power electronic devices with chips and technology of independent intellectual property rights, energy-saving uninterrupted power supply and the new type of power optimization device is apparently a typical object. More than 70% of the energy application rely on the device of power and electronics converter before loading. Electric power is the powerful means of saving energy and reducing emissions and is central to the information security and industrial automation. .For example, the converter will make the motor load save much more energy; UPS uninterruptible power supply will effectively guarantee the sound operation of the information equipment and the improvement of the industrial manufacturing level; switching rectifier module is the most important parts in network and communication system. The development of Information & industrial automation is closely connected with that of the electronic & electric power technology.

UPS power system and product classification

UPS power system equipment technology is a synthetic technology which based on a series of advanced technology of power conversion, digital control, high frequency switching, pulse width modulation, electromagnetic compatibility, and redundant, intelligent charging and discharging, network, drive and new techniques and the like.

UPS power develops from rotary generator in the 1960s to stationary and smart electronic circuit,and is still advancing. At present, UPS power generally refers to the static UPS power. It can be classified to three types of backup, online interactive and online according to the working mode. And,in terms of the size and field of application UPS power is classified as following:

1.Based on the size of power, UPS power system can be divided into large, medium, and small type. Specifically, the small UPS is defined as power products less than 3kVA; the UPS power system of medium size as: greater than or equal to 3kVA and less than 10kVA; the large size power as: greater than or equal to 10kVA.

2. UPS power system has two applications of both information equipment and industrial power.The first type of information equipment with UPS power system equipment is mainly applied to: information industry, IT industry, traffic, finance industry, aerospace industry and other computer information systems, communication systems, data center, network security protection. The UPS power system of the second type of industrial power is mainly used in: electric power, steel, nonferrous metal, coal, petrochemical, construction, pharmaceutical, automotive, food, military and other fields in industrial and power equipment industry. It serves as uninterruptible power supply equipment of AC and DC in electrical industrial automation system equipment, remote execution system equipment, high voltage circuit breaker switch, relay protection, automatic device, signal device to ensure the reliability of industrial automation and supply of power.

The development trend of UPS power

The market demand promotes the improvement of UPS performance, while the progress of science and technology facilitates the development of UPS technology, leaving UPS on the track of developing towards a redundant parallel, reliable, smart, green, and economic manner with high frequency and digitization.,.

Market demand

(1) Large-capacity UPS satisfies the market need of 9000 units/year, and is likely to increase at the rate of over 10 per cent. And the UPS with small capacity enjoys a pretty promising market share.

(2) Cost performance will remain the key factor in adding to the market shares..
(3) If an enterprise intends to go overseas and operate globally, it needs not only to build international brand, but also to make the brand "localization"in the transnational business. In addition to improve the cost-effectiveness, the local manufacturer producing UPS power has to invest more on the technology and R & D and to enhance its overall strength with a view to developing long enough on global market, Also they should improve the quality of service in order to adapt to the merger integration status of the market products and to participate in deep competition.
Technology
(1) High frequency: the power switch of the first generation UPS is controllable silicon, the second generation is large-power transistor or a field effect transistor(FET), and the third generation is IGBT (insulated gate bipolar transistor).

The speed of the high-power transistor or FET switch is higher than that of the controlled silicon by an order of magnitude, while the capacity and speed of the IGBT power device current is larger and faster than that of the large-power transistor or FET,leaving the working frequency of the converter circuit up to 50kHz.

New technology devices,and soft switching technique is applied to solve the high frequency limit by switching loss and to greatly improve the frequency of UPS power The improvement of converter circuit frequency greatly reduced the filtering inductance, capacitance, noise and the volume while drastically promoting the UPS efficiency, dynamic response and control precision.

(2) Redundant parallel

We can put the control circuit together as an independent pluggable module in an electronic device, and also we can have the power conversion units concentrated in one structure as a hot pluggable module.Similarly, in a power supply system furnished with species (units) of equipment, we can deem each (unit) equipment as a module, and do hot plug repair in the case of redundancy backup configurations. These days advanced UPS have direct machine function. If two of this UPS get redundancy together in parallel, and the two output capacity are made to be greater than or equal to twice of that of the load, when a failure occurs in one UPS, the other can bear all the load capacity and maintain the normal operation of the entire system and the first one may get the off-line repair. That means the repairing time is reduced to near zero and only when two UPS break down at the same time, will the system stop running, which is fairly uncommon.

(3) Digitalization

Digital control has become the mainstream in the development of the new UPS control technology. The highly precise and resistant digital controller can easily,detect, diagnose and isolate the fault, fulfill the remote control and telemetry, realize a couple of UPS parallel and hot swap, and monitor and manage the accumulator. Batteries built on the technology of digital control, data acquisition, signal processing, power management, network communication, computer hardware and software combine users and machine very well.

(4) Reliable

UPS is expected of a sufficient output capacity and reliability in the eyes of users, or otherwise it will affect the load operation, or even turn to a new fault source. Both the advanced technology of package and highly integrated technology and the high-quality components and raw materials make the UPS power supply more reliable and available. And availability of A is aimed to be 0.9999999, that is to say, the allowed downtime should be no more than 3s in one year. The data are right what users really need.

(5) Intelligent

Microprocessor was only used in the big and medium-sized UPS before, but in recent years it has been applied to the small, miniature UPS leaving the UPS more smart, including control, detection and communications. UPS is gradually controlled by the computer, and computer and its peripherals can cope with, manage and adjust some predictable problems on its own and automatically, such as to automatically shut off the host computer's operating system and its power, to regularly switch off the UPS itself, and to transfer the signal through the Internet to the operating system or network administrator, facilitating remote management. Thus, the centralized computer control take the place of human surveillance, and the intelligent computer helps people with "fool operation".

(6) Green

The harmonic current produced by a variety of electrical equipment and power supply devices caused serious pollution to power grid. But there is much call for the pollution-free green power supply device with the release of various policies and regulations. Except for the installation of the efficient input filter, the power factor correction technology should be used in the input side of the grid , which can eliminate the harmonic currents produced by rectifying and filtering circuit, and compensate for the input power factor. Rectifier uses IGBT technology, making the input power factor increase to close to one and the pollution to the power grid reduce to approximate the resistive load level. In addition, high-frequency pulse width modulation technology, multi-pulse rectifier technology, electromagnetic shielding and filtering techniques, the generalized soft switching technology, series parallel compensation technology are all effective way to make the UPS green.

The high-frequency machine of low cost and high performance will also become the market mainstream models in a certain period of time.

Analysis on the UPS power prospect in the industrial and power equipment market

Industrial power equipment UPS power system is mainly used in the industrial power equipment industry of electric power, steel, nonferrous metal, coal, petrochemical, construction, pharmaceutical, automotive, food, military and other fields, and serves as all electrical industrial automation system equipment, remote execution system equipment, high voltage circuit breaker, relay protection, automatic opening and closing device signal device, uninterruptible power supply equipment of AC and DC, and ensures the industrial automation and power supply is reliable. The constant power used in the industrial power is the high-end product among its similar products. It involves electric and electronic technology, digital control technology, AC power supply parallel redundancy technology, active harmonic suppression technology, and high-power products manufacturing technology, all of which have a large power (probably reached megawatt) energy conversion.Obviously, the ordinary power supply enterprises couldn’t enter this field. Yet enterprises with large power electronic technology and the ability to develop, produce and serve for serial products, could design, manufacture, and serve the constant power system of industrial power based on their rich industrial experience of applications.The UPS power used by the traditional UPS manufacturers in these areas is often product fitting into the industrial environment rather than the constant power of industry suitable for the industrial electrical environmental and the perceptual power load characteristic.

In telecommunications and financial industry in spite of the steady growth in the purchasing size than before, a specialist agency finds, that the market demand for the UPS power supply and its market share, in the near future, will be likely to shrink given the less hardware investment and the high retention rate of UPS power. By contrast, some industries of pretty small market share such as the manufacturing sector, the traffic and the energy sectors have seen a rapid increase in its demand for the UPS power, especially the emerging of medium and small enterprises of manufacturing in a large scale that have become the new drive for the growth of the UPS power market.