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The economic mode of UPS has great advantages, but the latest development of silicon carbide technology could offset the economic advantages of the mode, the transistor is the traditional silicon controlled device for UPS, insulated gate bipolar transistor (IGBT) function more and more powerful and reliable.

The UPS with IGBT device has an obvious disadvantage, the faster the switching speed is (to obtain higher accuracy), the higher the power loss. This is mainly because the upper limit of the module efficiency is 96.8%, and the efficiency of the dual conversion UPS can be increased to 98%~99% theoretically by using SiC devices.

The synthesis of silicon carbide powder has been mass production since 1893, the initial cost of manufacturing IGBT by using silicon carbide is very high, but the energy-saving effect is very significant, and all these are not the key to the power grid load transfer, will not increase the risk of power conversion.

At the module level, silicon carbide has two advantages: Smaller chip size and lower dynamic loss. At the system level, these advantages can be exploited in many ways. Low dynamic losses lead to a significant increase in output power, providing an opportunity to reduce weight and volume. It is worth mentioning that power increase can be achieved without additional cooling capacity, because compared with SCR, reduce the loss brought silicon carbide practical, can get higher output power under the same cooling condition. Low power loss can improve energy efficiency, allowing the design of more efficient inverters, so the UPS will be more efficient energy saving.

Therefore, if silicon carbide is used, UPS can no longer be operated in an economy mode, you can even eliminate online interactive UPS, as the user is able to less than 1% of the energy loss, it can get the comprehensive protection of voltage and frequency protection, who will need UPS to run in the economic model?

SOROTEC MPS9335C 10-1200KVA With Switch Cabinet Modular UPS Systems

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 modular UPS.
6.6-inch extra large LCD that can display 13 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.

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There have been customers bought a low-cost medical grade UPS, the power supply is 5V 200mA, hundreds of batches of the unit price is $5.
The device sells tens of thousands of dollars. The surprisingly low price of power seems pretty good. After opening this power supply, it is found that it has only one single-sided printed circuit board. In order to save the cost, the circuit board has no metallized through-hole. The circuit board adopts the surface mounting structure, and the component density is very large. The component spacing does not meet the requirements and design criteria of creepage distance specified by medical power supply and related safety management institutions. Leakage current up to 900mA, far beyond the specification limit. The creepage distance and the gap voltage can not reach the voltage used in the general power supply. The spacing between the high pressure regions is only 0.5mm, and the flux resistance is used to improve the dielectric resistance. The pin spacing of the MOSFET should have increased to increase creepage distance, but this power supply does not deal with this, probably because of the cost of manufacturing and this will take up more space. The aluminum fin is inserted into the circuit board by some claws, and then welded and fixed. Once the treatment is not correct, the radiator is easy to loose. MOSFET in flyback circuit is fullpak package with unkown manufacturer, there is a silicone jacket, and with insulating tape on the heat sink, which hinders the contact between device and radiator, which will have thermal stability may produce serious problems, that is heat sink is still cold when MOSFET has been hot. This power supply meets the commercial EMI-RFI requirements, but does not meet the medical power requirements.

This power has some other problems, such as the rosin joint in power supply everywhere. When using, even if the assembly is correct, also cause failure at any time. Although this power supply is sold as a medical UPS, it is not designed in accordance with the medical requirements. In addition to the input voltage and output voltage and current, there is no relevant documents and technical indicators. In addition to the surprisingly low price of this power supply, other performance are far from the requirements of medical power supply.

In the selection and purchase of hospital UPS, we must consider the risks, must be purchased from reputable manufacturers that provide quality and reliability standards and requirements.

SOROTEC GP9335C 10-800KVA Low Frequency Online UPS

■Use advanced 6th generation DSP and full digital control technologies to realize higher system stability.
■Output power factor is 0.9, carrying capacity than conventional 120 kva UPS with 10% above, as users reduce investment cost.
■Advanced distributed active parallel technology can realize parallel operation of 6PCS 120 kva UPS units without the need of centralized bypass cabinet.
■6-inch extra large LCD that can display 12 language ( Chinese ,English,Russian,Spanish,French and so on).
■Extra wide input voltage and frequency range make it adapt to severe power grid environment.
■Intelligent battery management maintains battery automatically to prolong the battery life.
■Standard input/output filter improves the system EMC performance.
■Extra strong capability to withstand output overload and short circuit, ensuring the system stability and system safety under extreme conditions.
■Layered independently-sealed ventilation channel and re-dundant fan, circuit boards with protective paints and a dust filter embedded make it highly efficient to dissipate heat and protect the product effectively under severeenvironment.

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Solar energy is no longer an emerging technology, but a technology that is undergoing major technological changes. As we move toward grid parity (The cost of solar energy is equivalent to that of traditional power generation) and improving traditional energy generation types, because the process of converting direct current into usable alternating current in the panel becomes more efficient and affordable.

However, although the solar panel prices have decreased significantly in recent years, the next development of solar energy development will be driven by the new technology of power converter system. The rise of multistage power switch topology sophisticated will be based on silicon carbide (SiC) and gallium nitride (GaN) materials, coupled with higher operating voltages (up to 1600 VDC), the power switch more quickly, compared with the traditional system, the performance will be greatly improved. Higher switching frequency means that the passive components of the power converter, that is, the size of the induction coil and capacitor can be greatly reduced, thereby reducing the weight and reducing the cost. These two points are the key advantages of solar energy market further expansion.

As a result, these new power switching topologies are driving changes in devices that provide relevant control and support. Smaller and faster systems require improvements in the whole power conversion signal chain, faster processing, and better device integration. However, as modern solar inverters become smaller and smaller, these innovations exacerbate the challenge of addressing the important security issues inherent in power conversion. That is, the physical isolation of dangerous voltages becomes more complex as these systems shrink in size.

Although the solar panels or solar modules are the core of the solar power system, but in the whole signal chain, the more complex part is the solar power inverter – the brain of the control system. Solar inverters need to be carefully designed to protect the current measurement and calculation circuit, so that it is not affected by the power processing circuit and the transient signal caused by the switch. However, this protection is costly: multiple redundant isolation devices can increase cost and system complexity. And it is clear that the increasingly complex algorithms required to run these systems through programmable processors need to consider code integrity to ensure the security of the system itself.

In addition, official security certification is a requirement for all developers. A lot of regulations about safety disconnection (and reconnection) must be followed. How fast the system must respond, how to deal with power outages and power outages, fast disconnect and arc detection, must be resolved – in many cases, each country / region has different solutions. Since certification increases the development time (cost), the proven devices and methods are attractive, and need to be flexible enough to accommodate multiple evolving regional safety regulations.

Fortunately, these problems can be easily solved by using a power inverter platform that can be integrated with advanced mixed signal control processors, and is isolated by complementary isolation of current detection and gate driver technology.

REVO Series Wall Mounted Integrated Solar Hybrid Grid Tie Inverter With Built-in MPPT Solar Controller

1.Touch screen display.
2.Output power factor PF=1.0
3.On grid with energy storage.
4.Energy generated record, load record, history information and fault record.
5.Language and time setting.
6.Structure with dust filter.
7.AC charging and AC output time setting.
8.Charging voltage and charging current timing.
9.External wi-fi device optional.
10.Parallel operation with up to only available for.
11.Smart battery charger design.

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48V DC power supply is composed of power transformer, rectifier circuit, filter and voltage stabilizing circuit.

1.Power transformer
The alternating current supplied by the power grid is generally 220V (or 380V). However, the magnitude of the DC voltage required by various electronic devices varies. Therefore, it is often necessary to approach the grid voltage first through the power transformer, and then convert the secondary voltage to the rectifier, filter and voltage regulator. Finally, the required DC voltage amplitude is obtained.

2.Rectifier circuit
The rectifier circuit is used to rectify the alternating sine and negative alternating voltage into a single direction pulsating voltage by using a rectifying element with unidirectional conductive property. However, this one-way pulsating voltage often contains a large pulsating component, which is far from ideal DC voltage.

3.Filter
The filter consists of capacitor, inductance and other energy storage components. Its function is to filter the pulsating component in the one-way pulsating voltage as much as possible, so that the output voltage becomes a relatively smooth DC voltage. However, when the grid voltage or load current changes, the amplitude of the filter DC voltage will also change, while in the relatively high demand of electronic equipment, this situation is not met the requirements.

4.Voltage stabilizing circuit
The function of the voltage stabilizing circuit is to take some measures to keep the output DC voltage stable when the grid voltage or load current changes.

SOROTEC SP6U-48200 48V Switching Power Supply Embedded System

1.Constructed with standard 19 inch screen, which has the advantage of wide use.
2.The data center area and the installation cost can be saved due to its small size and the embedded installation.
3.Wide input voltage range (85-290Vac), the power grid is adaptable.
4.Perfect lightning protection.
5.Rectifiers are hot-pluggable. Easy and quick on line maintenance.
6.The rectifier uses DSP (Digital Signaling Processor) ology, makes the power density ran up to 14W/In3.
7.Battery management, prolongs the life of the battery well.
8.Have passed CE, UL, TLC, and other related certifications.
9.Excellent energy conservation and environmental protection.

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Photovoltaic technology can provide clean, safe and reliable renewable energy, low operating cost, minimum maintenance requirements, zero fuel cost and long service life (more than 20 years). These advantages makes the off grid photovoltaic applications technically feasible and economically competitive. Solar power generation has been proved to be able to meet the social needs of future energy sources, and is a non polluting power generation mode. 450000 off grid solar systems (typical 35-100Wp capacity) have been installed in India; In developing countries, such as Nepal (61%) the majority of the population without electricity, the government has to give priority to rural areas, suburban electrification, and solar power generation network technology is one of the most widely used power generation technology.

One of the typical examples of off grid PV applications is the 1kW PV array of the VanGeet off grid photovoltaic base in Colorado, USA.
In this case, extending 1.5 miles to the building of power network at an estimated cost of $100000, of which, including amorphous silicon PV array with MPPT solar charge controller, 42.7kWh inverter battery combination 4kW, those with high efficiency building design combined, proved in economy and environmental protection are very successful.

Photovoltaic application in 2010 global shipping has been more than 16GWp, the market accounted for 87% of crystalline silicon material. Although the efficiency of world class polycrystalline silicon batteries has been reported to be as high as 20.3%, the efficiency of the typical commodity silicon module is only 13.4%, but it is still selected as the basis for this research. Because of the PV array power requirements provided by solar photons, the photovoltaic array does not power at night, electric power in cloudy or overcast local climate below the peak, the PV array with discontinuity. In order to ensure the continuity of off grid PV applications, these factors require battery energy storage.

The DC output from the PV array is firstly converted into AC (DC-AC) through the inverter, and the published inverter efficiency range is 85.8%-92.4% (maximum efficiency). However, when the polysilicon PV array is used, the total system efficiency of the inverter is about 10%. Under such a low conversion efficiency, the loss associated with the inverter should be minimized.

SOROTEC Solar MPPT Charge Controller 60A 3200W 12V 24V 48V

1. Intelligent maximum power point tracking technology increases efficiency 25%~30%
2. Compatible for PV systems in 12v, 24v or 48v
3. Three-stage charging optimizes battery performance
4. Maximum charging current up to 60a
5. Maximum efficiency up to 98%
6. Battery temperature sensor (BTS) automatically provides temperature compensation
7. Support wide range of lead-acid batteries including wet, AGM, and gel batteries
8. Multi-function LCD displays detailed information

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