SEO Blog

076月 2016

Temperature and humidity are the two main reasons for the failure of outdoor rated UPS. The electronic systems may does not contain the design of against harsh environmental conditions, in order to meet the protection of electronic equipment in the indoor and the outdoor environment, the industry invested a lot of time in dealing with the problem of cooling treatment. The cooling treatment of outdoor UPS systems has become a very important issue. In fact, it is only necessary to eliminate the problem of internal heat which is caused by the size limitation and the light radiation in the face, so it can solve the heat dissipation problem of outdoor electronic equipment.

HW9110E Routine 1-10KVA High Frequency Online Outdoor UPS (outdoor rated UPS,outdoor AC UPS)

The heat management of the outdoor AC UPS must make a choice for the environmental conditions of the equipment. The equipment is usually divided into indoor equipment and outdoor equipment. Indoor equipment including installation in the central office (CO) or client switching equipment (for different application circuit board), server, router, modem and batteries, depending on end use and decide. Outdoor equipment includes all the equipment that can be seen in the central computer room, but they are installed in a controlled environment.

In addition to ensuring that the device is in the best temperature and humidity conditions, and the telecom engineers must ensure that the equipment to maintain proper heating conditions in a short period of time to the power supply interruption or cooling device failure, until the outdoor UPS cooling device recovery work. Therefore, in the design of appropriate heat dissipation systems, designers must consider the heat dissipation problems may be encountered while in the normal state (steady state) and emergency state.

The above guidelines apply to the central computer room and client equipment as well as outdoor equipment. In addition to the general exchange and processing equipment, the battery device for providing power supply during power outages is also very important. Battery equipment also need to heat dissipation, but also put in a proper ventilation conditions in the house.

HW9110E 1-10KVA High Frequency Outdoor Online Hanging UPS (outdoor ups systems,ups outdoor)

026月 2016

In the process of using IGBT UPS, often by the impact of capacitive or inductive load, overload and even short circuit, etc., as well as the wrong operation of UPS, may cause IGBT damage. IGBT in the use of the main reasons for the failure of the following conditions:

HP9330C 20-80KVA High Frequency Online UPS (IGBT UPS,IGBT online UPS,IGBT based UPS)

1.Over current damage

IGBT has a certain anti over current capacity, but must pay attention to prevent the current damage. IGBT composite device has a parasitic thyristor, so has the latching effect. After the latching effect occur, the drain current cause excessive high power consumption, and finally lead to the damage of the device.

In order to avoid the IGBT happens latching effect and damage, the circuit design should ensure the IGBT maximum working current should not exceeding the IDM value of the IGBT. Also note that may be appropriate to increase the driving resistance Rg to extend the shutdown time, reduce the di / dt of IGBT. Driving voltage size will also affect IGBT latching effect, low driving voltage, under over current in long time and IGBT must be applied with negative bias voltage, IGBT manufacturers generally recommend with about 5V reverse bias voltage. In a negative bias voltage, the driving voltage is between 10 and 15V, and the drain current is 4 to 10 times higher than the rated current in the 5~10μs, so the driver IGBT must be designed with a negative bias voltage. Due to each IGBT based UPS load impact characteristic is not identical, and powered devices may occur short circuit fault, so take measures to limit the flow of IGBT current in the UPS design is necessary, consider using driving thick film circuit provided by IGBT manufacturers.

2.Over voltage damage
Due to the inductive components in the inverter circuit, IGBT will generate spike voltage in the moment of turn off, if the peak voltage is too high, may cause damage to the IGBT even breakdown. Prevent voltage damage methods: optimization of process structure of main circuit, by narrowing the large loop current path to reduce the circuit parasitic inductance; appropriately increase the IGBT driving resistance Rg to slow down the speed of the switch (but switching losses also increased); buffer circuit design, suppression of spike voltage. The diode used in the buffer circuit must be a fast recovery diode, the capacitor must be the film capacitor which is high frequency, low loss, good frequency characteristics. So as to achieve a good absorption effect. The common circuit divide into energy dissipation type and feedback buffer type. Feedback buffer type divide into passive type and active type.

3.Bridge arm damage
In IGBT online UPS, the two drivers of the same arm branch of the inverter bridge must be locked, and the dead time (i.e. common non conducting time) should be set. If common conduction happens, IGBT will soon be damaged. In the control circuit, the control timing of the driving problem should be considered in various operating conditions.

4.Overheat damage and electrostatic damage
Can be used to increase the amount of heat sink, heat conductive adhesive coating, forced fan cooling, set over temperature protection and other methods to solve the problem of overheating damage. In addition to pay attention to the electrostatic damage in installation process, the operator and tools must be protected against static electricity.

315月 2016

1.After the intention to purchase an EV, check the installation conditions
Before the installation of EV charging piles, the first thing you need to do is to survey whether you have matched the installation conditions, such as whether there is a fixed parking spaces, how far from the power grid lines, etc.. The simplest method is to ask residential property for the situation. Property mustknow some simple relevant installation issues, such as the installation of the program, the use of electricity, installation area and so on. In fact, you don’t have to worry about that, because themanufacturers will send personnel to solve the professional problems later.

2.Go to 4S shop to apply for the survey of installation field, select the type of charging piles
When the staff survey the site, it is best to ask the property together to deal with the installation issues, thus can not only have the professionals to answer questions about the property, but also improve the installation efficiency. And the property will also give some suggestions to the installation staff, such as parking spaces are in line with the installation conditions, whether meet the requirements of the line and so on.
As for charging pile types, at present home charging pile can be divided into vertical type and wall mount type electric vehicle charger. The advantage of wall mount type is saving space, low price, but must be installed in the wall which can be wired. The price of vertical type is higher, and it will occupy a larger space, but can be installed in the open parking lot.

SOROTEC wall mount type electric vehicle charger.

EV AC Charging Post---- Wall Mount Type (electric vehicle charger,electrical car charger,EV car chargers)

3.Find out what type of residential power supply is
After the investigation and consultation of the construction site, the problem you need to solve is the power supply. In fact, the most common power supply of charging pile is ordinary residents electricity, we need to apply box power supply wire from the state power grid, after the approval of qualified, the state power grid will send corresponding staff to wire. In addition, there are both advantages and disadvantages if use small commercial electric pressure. Its shortage is more electricity cost, the advantage is to avoid the cumbersome process of dealing with the state power grid, you can directly ask property to solve the problems.

4.Confirm the installation scheme of charging pile, start construction
A few days after the survey and installation site, the construction side will give the corresponding installation program, generally is the installation costs and details, as well as the construction effect chart. After property confirm the price and the material is correct, you can let the workers to install charging pile. If the wiring has been completed at this time, then you can connect to the charging pile and use normally. Due to the charging pile can be considered as the necessary supporting equipment for the electric vehicle, so now many electric vehicle manufacturers with different charging pile installation policy, some manufacturers responsible for free installation, the other may require customers pay a few cost.

5.If charging pile is not completed, can use a portable charger in emergency
Because it involves multi-party negotiation, so the speed of construction will be a little slower, the cycle is generally 1 months. So within a period of no private charging pile, in addition to charge in the public charging stations and 4S shop, the by portable ev charger is also possible under the premise of ensuring the safety, but do not recommend use for a long time.

EV DC Portable Charging Posts (portable electric car charger,portable electric vehicle charger,portable ev charger)

245月 2016

Test the main circuit DC voltage and output current, calculate the output power of the solar array, and achieve the maximum power point tracking. Disturbance resistance R and MOSFET series together, under the conditions of the output voltage is basically stable, by changing the duty cycle of MOSFET, to change the average current through the resistance, and the current disturbance is generated. At the same time, the output current and voltage of the photovoltaic cell will be changed. By measuring the change of the output power and voltage of the photovoltaic cell before and
after the disturbance, the disturbance direction of the next cycle will be determined. When the disturbance direction is correct, the output power of the solar energy board is increased, and the next cycle continues to move in the same direction. In this case, the disturbance and observation of the solar photovoltaic panels output up to the maximum power point.

12V 24V 48V MPPT Solar charge controller

MPPT Solar charge controller (12v mppt solar charge controller,24v mppt solar charge controller,48v mppt solar charge controller)

245月 2016

1.Off line UPS in the normal power supply directly supply power to the load from the city power, when the city power beyond its work range or power is off, switch to the inverter power supply through the switch. Simple structure, small size, low cost, but the input voltage range is narrow, the output voltage stability accuracy is poor, there is a switching time, and the output waveform is generally square wave.

2.Online UPS when the normal city power is normal, city power supply DC voltage to the inverter, through the inverter supply alternating current to the load, when the commercial power is abnormal, the inverter battery provides energy to keep inverter always in working state. The characteristic is that it has a very wide input voltage range, no switching time and high output voltage stability, which is especially suitable for occasions with higher power requirements. At present, the power greater than 3KVA is almost 3KVA online UPS.

3.When the city power is normal, the city power supply electricity directly to the load. When the city power is low or high, through the online interactive UPS internal zener voltage regulator circuit output, when the city power failure or abnormal, via switch turn to inverter battery power supply. There is a wide range of input voltage, low noise, small size and other characteristics, but also exist switching time.

HP5110E Line Interactive UPS (Online Interactive UPS)