The basic principle of pulse width modulation (PWM): The control method is to control the on and off of the switching device of the inverter circuit, so that the output end can get a series of pulses with equal amplitude, and use these pulses to replace the sine wave or the required waveform. That is to say, a plurality of pulses are generated in the half period of the output waveform, so that the equivalent voltage of each pulse is sinusoidal waveform, and the output is smooth and the low-order harmonics are few. By adjusting the width of each pulse according to certain rules, the output voltage and frequency of the inverter circuit can be changed.
For example, by dividing the sinusoidal half-wave waveform into N equal parts, the sinusoidal half-wave can be regarded as a waveform composed of N pulses connected to each other. The pulse widths are equal to ∏/n, but the amplitudes are different, and the top of the pulse is not a horizontal line, but a curve. The amplitudes of each pulse change according to the sinusoidal law. If the above pulse sequence is replaced by the same number of equal amplitude and unequal width rectangular pulse sequence, the midpoint of the rectangular pulse and the corresponding sinusoidal equivalence midpoint coincide, and the rectangular pulse and the corresponding sinusoidal part area (impulse) is equal, a set of pulse sequence is obtained, which is called PWM waveform. It can be seen that the pulse width varies according to the sine rule. According to the same impulse equivalent effect, the PWM waveform and the sine half wave are equivalent. For sine negative half cycle, PWM waveform can also be obtained in the same way.
In the PWM waveform, the amplitude of each pulse is equal. To change the amplitude of the equivalent output sine wave, only the width of each pulse can be changed according to the same proportion coefficient. Therefore, in the AC-DC-AC inverter, the output pulse voltage of the PWM inverter circuit is the amplitude of the DC voltage.
According to the above principle, the width and interval of each pulse in PWM waveform can be calculated accurately after the sine frequency, amplitude and the number of pulses in half period are given. According to the result of calculation, the PWM waveform can be obtained by controlling the on-off of all switching devices in the circuit.
Outdoor stainless steel cabinet technology is constantly improving, so that stainless steel cabinet has the best anti-vibration, anti-impact, anti-corrosion, anti-dust, waterproof, anti-radiation performance, in order to ensure that the equipment works stably and reliably. All designs are people-oriented, so that users can use more smoothly, SOROTEC focused on stainless steel outdoor cabinet technical design, and technical updates.
Stainless steel cabinet is the most commonly used toughened glass doors and mesh doors. And its quality plays a key role. Usually, the front and rear door panels are never allowed to have distortion, expansion, depression, burrs and other phenomena, its flatness is usually less than 2 mm. The difference in the same slot also needs less than 2 mm, and the installed door panels can not have obvious upward or downward adverse phenomenon, to ensure the flexibility of disassembly and assembly. When opening and closing the door, it must be flexible. The angle should be greater than or equal to 90 degrees. It is forbidden to damage spraying when the door rotates.
Only paying more attention to the small details of stainless steel cabinet doors will help attract more customers. Different types of doors will directly affect buyers’ decision to make purchases.
■.Highly integrated outdoor electrical enclosure with strong housing ability, can be used as equipment cabinet, battery cabinet or integrated cabinet ■.Well environmental adaptability with IP55 class protection and full ranges of temperature control system ■.Precise and separate temperature control reduces energy cost ■.Multi-layer panel structure makes less heat absorbance and saves energy ■.Anti-theft design and earthquake protection tests ensure outdoor electrical enclosure and equipments safety ■. Well environmental adaptability with IP55 class protection ■.Support delivery in whole or in parts with no limits to installation scenario
On the evening of September 19, the 60th anniversary celebration meeting of Ningxia Hui Autonomous Region was held in Helan Mountain Stadium. SOROTEC power frequency GP9335C series 500KVA UPS & 600KVA UPS were used in the meeting. The product design is highly integrated with digital technology, improving MTBF and reliability. The whole system is controlled by a main control board is independent, with high speed DSP control inverter, 6 unit with free frequency modulation PWM, IGBT integration, to provide clean and stable output voltage, to ensure stable and reliable operation of equipment.
During the celebration, SOROTEC dispatched technical engineers to the site throughout the day to ensure that the power supply system provides a 24-hour uninterrupted supply of stable, pure and reliable electricity.
SOROTEC GP9335C series 10-800KVA products have been successfully applied to the State Grid/Southern Power Grid, PetroChina System, Military, Medical, Rail Transit, Banking System, Chemical Industry, Politics and Mining, Manufacturing Plant and various large-scale events, etc., and have been praised by users.
Shenzhen Soro Electronic Co., Ltd is one of the top-leading Power Supply and solar inverter manufacturer, to deploy Qinghai China Tower solar-powered base transceiver stations.
SOROTEC installed the base stations, using a solar and diesel generator hybrid power solution to provide mobile connectivity in rural areas. The base stations will primarily be powered by harnessing solar energy without having to be linked to power grid.The diesel generator will be used as a backup. The new BTS Solar power system will improve GP’s network performance by preventing service interruption, a previously persistent challenge in Qinghai due to power instability. It will also lower fuel consumption and CO2 emissions, and reduce the cost of refuelling and site visits,thereby lowering GP’s total cost of ownership. These savings will offset GP’s capital investment in just two-to-three years. SOROTEC has developed a series of end-to-end green solutions for wireless broadband networks, using a combination of solar energy, wind power and diesel fuel. These innovative solutions aim to assist operators optimise energy efficiency, maximise their return on investment, fulfill their social responsibilities, significantly reduce the TCO in the product life cycle and enhance market competitiveness.
Shenzhen SORO Electronics Co., Ltd customize products to meet different international standards and specific client request. And our products have been widely used in different fields,including electric power, avaiation, traffic, post service, public security,customs, government and other entities domestically and abroad.
With the large-scale construction of data center, users pay more attention to energy cost and efficiency. The future development direction of power supply technology in data center must be direct power supply technology. While eliminating the traditional UPS equipment investment and site occupation and reducing the early cost, it also reduces the later operating cost by reducing conversion stages and improving power supply efficiency. And what is said here to improve efficiency, not only refers to the high efficiency of the grid side to the input side of IT equipment on the supply circuit path, but also the high efficiency and green of primary energy side to the CPU and other energy path. Although the PUE value of traditional concept is likely to increase, the energy consumption per unit calculation is reduced. The overall development trend of power supply technology in future data centers is that high voltage/centralized/AC large UPS will develop towards low voltage/distributed/DC small UPS, from centralized lead-acid batteries in computer rooms to distributed lithium batteries embedded in IT cabinets and even servers, from polluted fossil fuels to environmentally friendly green energy sources. .
The core of uninterruptible power supply technology in data center is uninterruptible power supply and its battery, so different battery connection positions also determine different power supply architecture. At present, the backup battery voltage of the industry mainstream from high to low has more than 400 volts of UPS, to 380V, 240V and 48V of DC power supply, and even 12V of batteries embedded in IT equipment. There are even small UPS with flywheels of medium voltage or lower voltage such as 5V. The closer the battery is to the terminal server motherboard or CPU, the more decentralized the power supply system, and the more distributed the corresponding IT system; the closer the battery is to the terminal, the higher the customization degree of the power supply system, the greater the difficulty for ordinary users to carry out the scale; the closer the battery is to the terminal, the higher the control and management level of IT power supply and battery required. Finally, the closer the battery is to the end, the smaller the transition stages from the grid to the CPU supply path, resulting in higher conversion efficiency, but the transmission loss may increase on the low-voltage side. Therefore, compared with centralized and distributed, high-voltage or low-voltage, AC or DC, the choice of different power supply structure will greatly affect the reliability of the power supply system, power supply efficiency, cost, and so on, as well as the maturity of technology, ecology and application flexibility.
In addition, with the development of battery technology and the introduction of green energy such as wind energy, solar energy and fuel cell into the data center, more opportunities and challenges are brought to the data center. In a sense, the technology of uninterrupted power supply in data centers will ultimately depend on the development of battery technology, and battery innovation will bring changes in the power supply architecture of data centers. For example, with the development of technology from traditional low-density lead-acid batteries to high-energy-density lithium batteries, backup batteries are likely to be replaced by IT cabinets or even placed inside IT devices. With the development of the same battery technology, it is possible to realize the energy storage of wind energy, solar energy and other volatile green energy. It will also change the traditional data center from a single grid power supply mode.
1.Superior energy saving and environment-friendly: Efficiency > 96% at 50%-75% rated load, and > 95% at 25% rated load; Input PF > 0.99,input THDi<3%. 2. Superior capability of powering load: Output PF is 0.9 or 1, no need of power deration with load of leading or lagging PF. 3. Easy-to-install: Top or bottom cabling, no need of input cabling cabinet. 4. Easy-to-maintain: Full front access, UPS, failed part can be replaced shortly. 5. Easy-to-modify: The number of battery cells can be configured flexibly, so the original batteries can be used when modifying the legacy system; moreover, the battery cell can be replaced in time when it fails without interrupting the normal operation of UPS. 6.6-inch extra large LCD that can display 12 language (Chinese ,English ,Russian, French ,Spanlish and so on). 7.Provide large LCD touch screen (optional). 8.Each UPS modules provide 4.5KW charge capacity. equivalent to 10 to 12A. 9.On-Line Double Conversion, fully isolating the influences of power grid pollution and power failure from utility power supply and diesel generator to load. 10. Advanced DSP full digital control technologies realize higher system stability, online capacity expansion and maintenance. 11.Advanced distributed active parallel technology realizes parallel operation of 4 UPS units and online capacity expansion without centralized bypass cabinet. 12.Digital load sharing technology features extra low cross current and extreme high system reliability in parallel operation. 13.Adaptive to severe power grid environment due to extra wide input voltage and frequency ranges. 14.Extra strong capability to withstand output overload and short circuit, ensuring the system stability and system safety at limit conditions. 15 Intelligent battery management maintains battery automatically to prolong the battery life. 16. Efficient heat dissipation and effective protection under severe environment due to its independent layer-sealed ventilation channel and redundant fan design, as well as the paint-protected circuit boards and built-in dust filter. 17.Applicable voltage south America.
