The core of smart home is the interoperability between devices. However, several mainstream wireless RF connection methods (such as WiFi, Zigbee, and BLE) always have technical bottlenecks such as poor penetration, which may result in the network not covering the entire family. The core problem has not been solved, and naturally it will not be able to form a real commercial scale.
When we are still entangled in this issue about which wireless technology is more suitable for smart homes, there are already people who have taken a different approach and explored a way to build a home network through wired control. This technology is actually no stranger to us. It is intelligent. The power grid field has been used for many years and is now very mature power line communication (PLC, Power Line CommunicaTIons).
The power line communication transmits control signals on the power transmission line with a power frequency of 50 Hz, and centrally controls each control node with an open network structure. The biggest feature is that there is no need to re-erect the network, as long as there is a wire, it can be carried out. Data transfer. Conventional PLCs cannot be applied to long-distance network data transmission because the power line causes a certain degree of reduction in the carrier signal. However, if it is used only in the home range, many problems of binding PLC applications will no longer exist. With the rise of the concept of smart home, the development of PLC will undoubtedly usher in a new opportunity.
At the 2015 Smart Home Expo, the reporter was fortunate to have contacted a well-known domestic manufacturer of PLC smart home solutions, Shenzhen Lihe Microelectronics Co., Ltd., and had an in-depth discussion with his general manager, Mr. Liu Wei.
Liu Wei, General Manager of Shenzhen Lihe Microelectronics Co., Ltd.
Mr. Liu believes that in fact, the three major wireless technologies we are talking about now: WiFi, Bluetooth, and Zigbee are not applied to the smart home scene since the day of birth. This is because smart homes have only emerged in recent years. Fresh things, and these technologies have been developed for decades. At the beginning of the rise of WiFi, due to the demand for mobile office, the signal coverage requirements are not particularly demanding, people can bring a notebook to find a stronger signal position; Bluetooth is designed for short-range wireless, mouse, keyboard The headset can be connected without a data line; Zigbee's cellular transmission mode has data forwarding function, mainly for visual distance transmission, and is more suitable for users outside the space. These three wireless technologies are now equated with being "caught on the shelves". The fact is that the industry has been unable to find better technology to replace them.
"PLC is also a long-established communication technology, but it seems that it is more suitable for smart home than the wireless network." Liu Wei pointed out that PLC relies on the power line to transmit data, there is no poor ability to penetrate the wall. This kind of defect has a coverage that is unmatched by any other network. Compared with WiFi, PLC itself can achieve certain self-organizing network capabilities, up to 1024 nodes, and the cost is equivalent to wireless modules such as WiFi. At present, related products such as home gateways, smart sockets, LED lights, smart meters, water meters, street lights control, etc. based on this technology have been available.
Finally, in response to the development of Lihe Microelectronics and the current domestic PLC technology, Liu Wei introduced that Lihe Microelectronics started the development of the second generation power line carrier technology in 2008, and officially released the second generation power line carrier in 2009. The technology chip is currently the only company in China that sells a large number of second-generation power line carrier technology products.
“In addition to the domestic market, our products have always been sold well in foreign markets. Why are foreigners so keen on our products? This is because the domestic grid environment is quite complex, such as heavy load, noise and interference. China's independently developed gPLAN PLC technology has solved these problems well, and has been successfully applied for many years, making China's PLCs in the forefront of the world both in terms of technology and practical application. Naturally, Very popular with the international market." Liu Wei added.
Product Description
SPD Surge Protective Device,Lightning Surge Protector
Surge Protection Device (SPD)
It is a device used to limiting instant surge voltage and discharge surge current, it at least including a non-linear component.
Surge protective Device Model Selection
With the impact of international information flow, the rapid development of microelectronic science and technology, communication, computer and automatic control technology, make the building start to go for high quality, high functional area, formed a new building style-intelligent building. As inside the intelligent building there are lot of information system, <<Building lightning protection design norm>> GB50057-94(2002 vision)(hereafter brief as <<lightning protection norm>>) put forward the relative requirement to install the surge protective device, to ensure the information system safely and stable running.
SPD essentially is a equipotential connection material, its model selection is according to the different lightning protection area, different lightning electromagnetic pulse critical and different equipotential connection position, decide which kind of SPD used in the area, to achieve the equipotential connection with the common earth electrode. Our statement will based on SPD's maximum discharge current Imax, continuous operating voltage Uc, protection voltage Up, alarm mode etc.
As per << Lightning Protection Norm>> item 6.4.4 stipulation "SPD must can withstand the expected lightning current flow and should confirm to the additional two requirements: the maximum clamp voltage during surge across, capable to extinguish the power frequency follow-on current after lightning current across." That is the value of SPD's max. clamp voltage add its induction voltage of two ends should be same with the system's basic insulation level and the equipment allowed max. surge voltage.
SPD for Power Supply System Series Selection Guide
The installation of SPD at each lightning protection zone, according to the standard of Low Voltage Electrical appearance, make classification of electrical equipment in accordance with the over voltage category, its insulation withstand impulse voltage level can determine the selection of SPD. According to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the over voltage category as signal level, loading level, distribution and control level, power supply level. Its insulation withstand impulse voltage level are:1500V,2500V,4000V,6000V. As per to the protected equipment installation position different and the different lightning current of different lightning protection zone, to determine the installation position of SPD for power supply and the break-over capacity.
The installation distance between each level SPD should not more than 10m, the distance between SPD and protected equipment should as short as possible, not more than 10m. If due to limitation of installation position, can't guarantee the installation distance, then need to install decoupling component between each level SPD, make the after class SPD can be protected by the prior class SPD. In the low voltage power supply system, connecting an inductor can achieve the decoupling purpose.
SPD for power supply system specification selection principle
Max. continuous operating voltage: bigger than protected equipment, the system's max. continuous operating voltage.
TT System: Uc≥1.55Uo (Uo is low voltage system to null line voltage)
TN System: Uc≥1.15Uo
IT System: Uc≥1.15Uo(Uo is low voltage system to line voltage)
Voltage Protection Level: less than the insulation withstand impulse voltage of protected equipment
Rated discharge current: determined as per to the lightning situation of the position installed and lightning protection zone.
SP1 Series
Normal Working Conditions
-Altitude not exceed 2000m
-Ambient air temperature:
Normal range: -5ºC~+40ºC
Extend range: -40ºC~+80ºC
-Relative Humidity: 30% - 90% under indoor temperature condition
- At the place without obviously shaking and shock vibration
- Non-explosion danger medium, non-corrosion gas and dust ( including conductive dust)
Classification
-As per Nominal Discharge Current:
5,10,20,30,40,60KA(8/20µs)
- As per Maximum continuous operating voltage:
275V,320V,385V,420V,440V,460V
- As per to poles
1P,1P+N,2P,3P,3P+N,4P
- As per auxiliary functions:
a. With remote signal output ( remote alarm function)
b. Without remote signal output
Selection Principle
- The continuous applied voltage on the two terminals of SPD should not more than the maximum continuous operating voltage Uc value;
- The voltage protection level Up of SPD should less than the maximum impulse withstand voltage of the protected equipment;
- As per to the different earthing system and protection mode to select the specification accordingly;
Product Features
1, built-in over-current overheating, temperature control circuit technology.
2, the module design, easy installation, online replacement.
3, low leakage current, fast response time, low residual voltage.
4, alarm indication device, green (normal) v red (fault).
| Model/Technical Parameters | WR-B60 | WR-B80 | WR-B100 | WR-B120 | WR-B150 |
| Rated Operating Voltage Un (V ~) | 220V 380V | 220V 380V | 220V 380V | 220V 380V | 220V 380V |
| Maximum Continuous Operating Voltage Uc (V ~) kV | 385V 420V | 385V 420V | 385V 420V | 385V 420V | 385V 420V |
| Voltage Protection Level Up (V ~) kV | ≤1.8≤2.2 | ≤2.4≤2.5 | ≤2.5≤3.2 | ≤3.4≤3.7 | ≤4.0≤4.5 |
|
Maximum Discharge Current Imax(8/μ20μs)kA |
60 | 80 | 100 | 120 | 150 |
|
Nominal Discharge Current In(8/μ20μs)kA |
30 | 40 | 60 | 80 | 100 |
| Response Time | <25 | <100 | |||
| L/N(mm²)The Cross Section Of L/N Line | 16,25 | 16,25 | 16,25 | 16,25 | 25,35 |
| PE (mm²)The Cross Section Of PE Line | 16,25 | 25,35 | 25,35 | 25,35 | 35 |
| Fuse or Switch (A) | 63A | 63A | 63A,100A | 63A,100A | 63A,125A |
| The Line Section of Communication and Alarm (mm²) | ≥ 1.5 | ||||
|
Operating Environment-C |
(-40ºC~-+85ºC) | ||||
| Relative humidity 25 ºC | ≤95% | ||||
| installation | Standard Rail35mm | ||||
| Material of Outer Covering | Fiber Glass Reinforced Plastic | ||||
Surge Protector SPD,Surge Protection Device SPD,SPD
Wenzhou Korlen Electric Appliances Co., Ltd. , https://www.korlenelectric.com