Portable Soalr Poower Generator Applications in Energy Harvesting
Author: Source: Datetime: 2016-10-18 18:08:15
Such solar power portable generator systems typically most of his career in the service are in standby sleep mode, only a very low level μW power. When awakened, the sensor will measure parameters such as pressure, temperature or the like mechanical deflection and wirelessly sends the data to a remote control system. The entire measurement, processing and delivery time is usually only a few dozen ms, but within this short period may require a few hundred mW of power.
Due to very low duty cycle of these applications, it is necessary to collect the average power will be relatively low. Power may be a battery only. However, the battery will have to be some way to recharge, and ultimately had to be replaced. In many of these applications, the actual cost of replacing the battery so that the lack of high feasibility like solar power portable generator. This makes the energy source environment has become a more attractive alternative.
Emerging Nano-power Wireless Sensor Applications
On building automation, such as possession of sensors, thermostats and light switches and other control portable solar power generator systems can eliminate the normally required power or control lines, and replace it with a mechanical or energy harvesting system. In addition to the exemption can be the first line installation (or periodic replacement of lifepo4 batteries like lifepo4 battery in wireless applications) requires, this alternative method can reduce the cost of routine maintenance of cable systems often exist.
A typical configuration or energy harvesting wireless sensor node consists of four modules (see Figure 1). They are: 1, an environmental energy sources, such as solar power portable generator; 2, and one for the rest of the supply to the power conversion assembly node; 3, a node will link to the real world sensing assembly and a computing component (by the a microprocessor or microcontroller, is responsible for processing the measured data and stores the data into a memory); 4, a unit consisting of the short range wireless communication module for enabling wireless communication with the outside world and the neighboring nodes.
Examples of ambient energy sources include connection to a heat source (such as: HVAC duct) thermoelectric portable solar power generator (TEG) or thermopile, or is connected to a source of mechanical vibration (eg: window glass) and solar cell piezoelectric transducer. In the presence of a heat source, a compact thermoelectric device (often referred to as "transducer"), a small temperature difference can be converted to electrical energy. And when there is a mechanical vibration or strain, the piezoelectric device can be used to very small vibrations or strain difference is converted to electrical energy. Finally, in the case of the presence of light, the photovoltaic cell at peak sunlight conditions per square centimeter can produce more than 50W of electrical power, and in the indoor lighting conditions can produce up 100μW electric power.
Once the electrical energy generated of portable solar generator, it can collect energy from one circuit to convert and adjusted to a suitable form for supply to the downstream electronics. Thus, a microprocessor can wake up a sensor to take a reading or measured value, and then reading or measurement may be processed using one analog to digital converter, through an ultra low power radio transceiver for transmission.
The link in each circuit module so far have been some special restrictions that affect their use in commerce. Low cost and low power sensors and microcontrollers to market for some time, while the ultra-low-power transceiver is available only recently realized with a microcontroller integrated (to provide a very low-power wireless connectivity). However, this link has been lacking in energy harvesting IC.
Existing energy collector / manager module implementations tend to use relatively low performance discrete type structure typically includes 30 or more components. Such designs have low conversion efficiency and high quiescent current. Both defects are resulting in the need to use larger and more expensive batteries and solar cells, thereby undermining the performance of the final portable solar power generator system.
If you do not use these larger energy storage element, low conversion efficiency will increase the time required for system power, which in turn will extend from obtaining a sensor reading to the data transmission time interval. High power conversion circuit quiescent current will portable solar power generator limit can be collected and delivered to the application load the "available" energy. Moreover, while achieving low quiescent current operation and high power conversion efficiency must also have advanced analog switch-mode power supply expertise - which is rarely readily available.
"Missing link" has been able to capture and manage surplus energy from extremely low power supply of highly integrated DC / DC converter.
Case Study of Energy Harvesting
Buried in the remote wilderness of underground pipeline, solar powered portable generator requires continuous monitoring of flow rate, temperature and pressure (every 50 meters along the pipeline section). Each node has a built-in conduit wall temperature, pressure and flow sensors. It must be carried out every five seconds to measure and report the measurement results. Since the pipeline up to hundreds of miles, thus laying the power supply and information lines will be very expensive, and must provide ongoing maintenance, it may require costly repairs. In addition, the regular replacement of the battery will also be a very money work, this is because the number of cells is very large and remote areas often rugged roads. What we need is a way to continue to produce sufficient power supply - solar power portable generator is readily available and can be self-sustaining. The most common and easy to use one energy source may be a small solar cell such as a battery or super capacitor and other energy storage element coordinated operation for providing a continuous supply of power at night and adverse weather conditions.
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