482results about How to "Improve power supply capacity" patented technology

The invention belongs to the field of power distribution systems, and relates to a method for estimating the power supply capacity of a power distribution system, which takes the 'N-1' Principle into account. The method comprises the following steps: (1) the data of the power distribution system is collected; (2) the topology of the power distribution system is simplified, and the contact information is acquired; (3) the interconnection relation of the main transformer is analyzed to form a main transformer communication relational matrix; (4) the 'N-1' analysis of a communication unit is performed; (5) the analysis result of the step (4) is integrated to obtain the maximum allowable load factor of the main transformer; and (6) the maximum power supply capacity of the system is calculated based on the analysis result in the step (5). The invention overcomes the defects that the conventional power distribution system is based on flow and iterative optimization, takes the capacity constraint of the actual line and the in-station priority transfer factor of a transformer station into account, provides the maximum power supply capacity of the power distribution system based on the 'N-1' Principle and the one-time calculation of the interconnection relation, and finds out the network bottleneck when in calculation, thereby providing the reference basis for optimization and planning of the power distribution system.

An object is to provide an artificial vision system ensuring a wide field of view without damaging a retina. In the artificial vision system, a plurality of electrodes (23) are to be implanted so as to stick in an optic papilla of an eye of a patient. A signal for stimulation pulse is generated based on an image captured by an image pick up device (11) to be disposed outside a body of the patient. The electrical stimulation signals outputted from the electrodes (23) based on the signals for stimulation pulse stimulate an optic nerve of the eye, thereby enabling the patient to visually recognize the image from the image pickup device (11).

The storage device comprises a storage unit configured to store data in a non-volatile manner; a first connector configured to be connectable with a first interface having a first power supply capacity and receive a supply of electric power for operating the storage device from the first interface; a second connector configured to be connectable with a second interface having a second power supply capacity and receive a supply of electric power for operating the storage device from the second interface; an identification unit configured to identify a type of an interface connected via the first connector or the second connector; and a control unit configured to control power consumption of the storage unit according to the identified type of the interface.

The invention relates to a multi-mode switching coordination control method for a direct current micro-grid system. Specific models are built for each micro-grid unit in the micro-grid system, working modes of the operation of the system are divided, various disturbance influences in various modes are full considered, and stable operation of the system in grid-connected and off-grid operation stable state and various disturbances thereof such as mutual switching and load and generating fluctuation is realized. According to the method, according to the load bus voltage and specific condition, the control strategy is reasonably adjusted, and the system can operate in a stable manner in different working modes and conditions; the micro-grid units and the coordination control method between the micro-grid units are controlled regarding the voltage as the control main body, stable operation of the system is guaranteed, frequent power exchange between the micro-grid units is avoided, and the power consumption is reduced; and compared with the prior art, the power grade of a converter is reduced, the system security and the reliability of energy storage are improved, and the failure rate due to an energy storage system is reduced.

The invention belongs to the field of power distribution system optimization planning, relating to an optimization method for an electric distribution network contract structure for improving power supply capacity, the optimization method comprises the following steps of: (1), building a power supply capacity calculating module of an electric distribution system for calculating main transformer overload and contact capacity constraint; (2), compiling the power supply capacity calculating module; (3), using the power supply capacity, number of main transformer contact channels and total length of region contact channels as an objective function to build an optimization model based on a multi-objective main transformer contact structure; (4), adopting genetic algorithm to achieve the optimization for the electric distribution network contract structure. The optimization method can satisfy the load growth requirements on the condition of trying not to add sites and occupying fewer corridors, and can completely improve the utilization factor of the urban electric distribution network on the basis of ensuring the power supply to be safe and reliable.

The invention discloses a health service robot capable of achieving electroencephalogram detection. The health service robot comprises a robot body, a main control unit, a motion control unit, a binocular vision capture unit, a man-machine interaction unit, an environmental perception sensor unit, a power supplying unit and a medical treatment detection unit; the medical treatment detection unit comprises an electroencephalogram detection device independent of the robot body; the main control unit is connected with the motion control unit, the binocular vision capture unit, the man-machine interaction unit, the environmental perception sensor unit and the medical treatment detection unit through bus communication protocols and serial communication protocols; the power supplying unit is used for supplying power for the main control unit, the motion control unit, the binocular vision capture unit, the man-machine interaction unit and the environmental perception sensor unit. The health service robot is combined with the electroencephalogram detection device, a robot moving technology and a medical treatment detection technology, and therefore the movable and portable properties of the electroencephalogram detection device can be improved to a large extent.

The invention discloses a GIS space service based distribution network power supply capacity real-time analysis method. The method comprises the steps of real-time power failure data analysis, real-time extra low voltage circuit analysis and real-time heavy overload platform analysis; according to historical power failure data and real-time power failure data, frequent power failure analysis is conducted from regional distribution and time distribution, and pre-alarm is conducted on frequent power failure areas and time frames; power failure influence, breakdown repair, distribution network investment and consumer complaint information are associated, and the planned outage schedule rationality, distribution network fault repair efficiency, sensitivity of different areas on power failure and distribution network effectiveness are analyzed; by means of GIS space service, real-time states and analysis results of distribution transform and feeders are displayed on a map. Accordingly, locating and tracking of abnormal distribution transform information and image display of the regional abnormal degree are achieved, auxiliary correlation analysis is conducted on abnormal areas and all related factors, distribution network power supply capacity influence factors are deeply analyzed, and the decision basis is provided for distribution network transformation.

A power supply capability evaluation method considering difference reliability of an active power distribution network comprises the step of building a power supply capability evaluation model considering difference reliability of the active power distribution network, wherein a target function of the model is maximum power supply capability of the active power distribution network, the power supply capability of the system comprises a main transformer layer and a medium-voltage network layer, an optimization object of the model is a year load peak accessed to each feeder, and a reliability index is used as a constraint condition. A solution method for a power supply capability evaluation model considering difference reliability of the active power distribution network is given out. The solution method comprises reliability evaluation of the active power distribution network comprising a main transformer and a distributed photovoltaic storage battery and power supply capability optimization calculation by taking a reliability evaluation result as an important constraint. Different reliability demands of different regions can be combined, access of distribution photovoltaic energy storage can be combined, a network can be output, the maximum power supply capability of the whole and difference reliability constraint can be met, the optimization of whole power supply capability and local power supply capability can be achieved, and a support is provided for improving the power supply capability of an existing power distribution network structure.

The invention discloses a vehicle mounted generating system based on mixed power of wind energy and fuel, which comprises a wind generating device, a fuel generating device, an electrical storage device, an electric device and a controller. The power output ends of the wind generating device and a fuel generating device are in parallel connected so as to supply power to the electric device and simultaneously are electrically connected with the electrical storage device; and the wind generating device consists of a wind turbine, a coupling device, a high-speed flywheel and a wind generator which are sequentially in series connected and arranged in the carriage of a moving vehicle through a telescopic lifting tower. The invention also discloses a control method of the vehicle mounted generating system based on the mixed power of wind energy and fuel, which achieves the optimal generation and energy storage control based on the mixture of wind energy and fuel through the controller, reduces the diesel fuel consumption to the maximum extent, improves the generating capacity and supply time and offers better services in the fields of disaster relief, outdoor adventure and military war and the like.

The invention discloses a unified energy control system, and the system comprises a single-phase multi-winding isolation transformer which is connected to a power supply arm; an energy storage and conversion device which comprises at least one energy storage and conversion submodule, wherein the input side of the energy storage and conversion submodule is connected with an auxiliary side winding, and the energy storage and conversion submodule comprises an energy storage module and a bidirectional AC-DC converter; a measurement circuit which is connected with a power grid side and a traction side; a comprehensive optimization controller which is connected with the measurement circuit; and an energy storage and conversion controller which is connected with the comprehensive optimization controller and the bidirectional AC-DC converter. The invention also provides a comprehensive optimization control method for the unified energy control system. The beneficial effects of the invention are that the system achieves the real-time storage and release of regenerative braking energy of a traction engine, and efficiently uses the regenerative braking energy; the system carries out electricity storage when there is no traction load, preferably carries out charging for energy storage during valley and discharging for energy supply during peak, achieves the peak cutting and valley filling and demand-side response management, improves the power supply capability and reduces the operation cost; the system achieves the treatment of the fluctuation and deviation of negative sequence, reactive power, harmonic wave and voltage.

The invention discloses a uniform energy storage and conversion control system. The system comprises a single-phase multi-winding isolation transformer, an energy storage and conversion device, a measurement circuit, a comprehensive optimization controller and an energy storage and conversion controller, wherein the single-phase multi-winding isolation transformer is connected with a power supply arm; the input side of the energy storage and conversion device is connected with a secondary-line winding, the energy storage and conversion device comprises at least one energy storage and conversion submodule, and each submodule comprises at least one two-way AC-DC converter, a two-way DC-DC converter and an energy storage module; the measurement circuit is connected with the power grid side and the traction side; the comprehensive optimization controller is connected with the measurement circuit; the energy storage and conversion controller is connected with the comprehensive optimization controller, the two-way AC-DC converter and the two-way DC-DC converter. The invention further provides a comprehensive optimization control method for the uniform energy storage and conversion control system. The uniform energy storage and conversion control system has the advantages that regenerative brake energy of a traction engine is stored and used in real time, charging energy storage during the valley time period and discharging energy supply during the peak time period are carried out preferentially, peak clipping and valley filling and demand side response management are achieved, power supply capacity is improved, and cost is reduced; negative sequence, idle work, harmonic wave, voltage fluctuation and deviation management is achieved.

A power source system capable of temporarily increasing the power supply capacity of a power accumulator when an interruptible power source is stopped. Upon receiving stop information of the interruptible power source from an integrated control ECU, a controller reduces an operable voltage that is determined as an output voltage for ending discharge of the power accumulator, outputs the reduced operable voltage from a communication part to the integrated control ECU. The integrated control ECU controls a charge / discharge control device based on the reduced operable voltage, and increases the power supply capacity of the power accumulator.

The invention relates to a channel flow generator applied to a remote meter reading system, and belongs to the technical field of power generation. A fluid cavity and an energy harvesting cavity are arranged on a main body, the lateral wall of the fluid cavity is provided with an inlet / outlet and a lower end cover, the lateral wall of the energy harvesting cavity is provided with an axial pin hole and an upper end cover, and the upper end cover is provided with a circuit board; a main body separating plate is provided with a circular truncated cone, the circular truncated cone is provided with an axial guide groove, a bearing hole and a cavity, a main shaft is installed on the lower end cover and the circular truncated cone through a bearing and provided with a magnetic ring and an impeller, a pin shaft and a magnetic block are arranged at the two ends of each piezoelectric vibrator in a riveted mode, the magnetic blocks are arranged in circular truncated cone guide grooves, the pin shafts are arranged in the pin hole of the energy harvesting cavity and pressed through the upper end cover, and the magnetic blocks are installed near the opposite pole of the magnetic ring. The channel flow generator applied to the remote meter reading system has the advantages that pre-bending type piezoelectric vibrators are stimulated through non-contact magnetic coupling for stretching deformation power generation, a movable component is sealed in the fluid cavity and does not leak, the reliability of operation of a circuit system is high, piezoelectric patches only bear pressing stress, mechanical reliability is high, the magnetic ring stimulate the multiple piezoelectric vibrators at the same time, the power generation capacity is high, and noise is avoided.

The invention relates to a back plate system. The back plate system comprises one or more service plate cards, a power supply module, a signal back plate and a power supply back plate, wherein the service plate cards are arranged on one side of the signal back plate and used for processing services; the signal back plate is used for signal interconnection between the service plate cards or signal interconnection between the service plate cards and other modules; the power supply module is arranged on the other side of the signal back plate and used for connecting with the service plate cards through the power supply back plate and supplying power to the service plate cards through the power supply back plate; a ventilation area is formed between the power supply back plate and the signal back plate or ventilation holes are formed in the signal back plate; the ventilation area and the ventilation holes are used for forming an air channel from one side to the other side of the signal back plate so as to cool the system; the plane on which the power supply back plate is arranged is parallel to the ventilation direction of the air channel; and the signal back plate is vertical to the plane on which the power supply back plate is arranged, and is vertical to the ventilation direction of the air channel.

The invention provides a power-frequency online anti-icing de-icing method for an electrified railway contact network. The method comprises the steps as follows: A, the head end and the tail end of any power-supply arm of an electrified railway traction substation are respectively connected with a head-end dynamic reactive compensation device and a tail-end dynamic reactive compensation device; and a temperature sensor is arranged on a contact network and connected with a controller of the head-end dynamic reactive compensation device and the tail-end dynamic reactive compensation device; and B, the temperature sensor monitors the temperature of the contact network, and when the detected temperature is lower than 0 DEG C, the controller controls the head-end and the tail-end dynamic reactive compensation devices to enter into an anti-icing de-icing working state and specific current is generated on a contact net for anti-icing and de-icing. The method is used to carry out automatic online anti-icing and de-icing under the condition that the railway is in a continuous running state and the power supply is not influenced, so that the contact network is not frozen in freezing rain, ice and snow and extreme weathers, thereby ensuring the safety of train operation.

The invention discloses a wearable device based electroencephalograph detection device which comprises an electroencephalograph acquirer, an integrated analog front end, a mixed signal microcontroller, a Bluetooth module, a display device, a power supply management module, a solar cell, an input device and an indicating lamp. The electroencephalograph acquirer comprises a single conductor electroencephalograph electrode and a reference electrode, wherein the single conductor electroencephalograph electrode is arranged on the inner side of a hat to be in contact with the forehead, the reference electrode is clamped at the position of the earlobe, and the electroencephalograph acquirer is connected with a wearable device through an audio interface connector. The electroencephalograph acquirer is connected with the integrated analog front end, the integrated analog front end is connected with the mixed signal microcontroller, and the Bluetooth module is connected with the mixed signal microcontroller and an external network. The power supply management module and the solar cell are connected and used for detecting power supply of relevant parts in the device. The wearable device based electroencephalograph detection device is small in size and very low in power consumption, can utilize solar energy to achieve charging and facilitates anytime anywhere electroencephalograph monitoring of a brain cognition function, neural and mental diseases, sleeping and fatigue states and other occasions.

The invention discloses a method and device for performing redundant reassembling on storage batteries. The device comprises a storage battery pack, a performance monitoring processing module and a storage battery assembling output module, wherein a plurality of storage batteries are arranged in the storage battery pack; each storage battery is connected with the performance monitoring processing module; the storage battery assembling output module comprises a plurality of on-off selection modules; the storage batteries form a series-connection loop for supplying power to electricity utilization equipment through the on-off selection modules; the quantity of the on-off selection modules is equal to that of the storage batteries, and the on-off selection modules are in one-to-one correspondence with the storage batteries. The performance problem of the storage battery pack during running can be found immediately by the performance monitoring processing module or whether the storage battery pack is in an optimal assembling state can be judged; then the working storage battery with abnormal performance or in a non-optimal assembling state is replaced by the redundant storage battery so as to reassemble a new storage battery pack to keep the normal power supply capacity or improve the power supply capacity.

The invention relates to a piezoelectric pipe water flow electric generator, and belongs to the technical field of electric generation. A fluid cavity and an energy capturing cavity are formed in a body, an inlet and an outlet are formed in the side wall of the fluid cavity, and a lower cover is installed at the end of the side wall of the fluid cavity; an upper cover is installed at the end of the side wall of the energy capturing cavity, a circuit board and transducers with magnetic blocks installed at the ends are installed on two steps on the inner side of the side wall of the energy capturing cavity, and each transducer is formed by two bent piezoelectric vibrators; a boss is arranged on a partition plate of the body and provided with guide grooves, a bearing hole and a cavity, and the magnetic blocks are arranged in the guide grooves of the boss; a main shaft is installed on the lower cover and the boss through bearings and provided with a magnetic ring and an impeller, and the magnetic blocks and the magnetic ring are installed in the mode that polarity-opposite magnetic poles are close. The piezoelectric pipe water flow electric generator has the advantages that the pre-bent piezoelectric vibrators are stimulated through non-contact magnetic coupling to be deformed for electric generation, movement parts are sealed in the fluid cavity, leakage is avoided, and a circuit system is high in running stability; piezoelectric plates only bear pressure stress, so that the mechanical reliability is high; the multiple piezoelectric vibrators are stimulated by the magnetic ring at the same time, the electric generation capacity is high, and noise is avoided.

The invention relates to an unmanned rail electric vehicle and a sky-train system. Regarding the rail electric vehicle, a lane is laid by turnout-free light rails and an anti-impact vertical guide pavement closed and laminate lane, and the vehicle runs on the railway, thus being named as sky-train; the rail electric vehicle adopts unmanned driving, and a destination is found through addressing codes by a vehicular computer system and through road infrared remote control information; a rail electric vehicle monitor center, an automatic indoor parking lot, a high-rise high-capacity indoor parking lot, an indoor platform and a waiting room are arranged; a bus-type rail electric vehicle ticket can be booked by a method which sends a short message via an internet mobile phone, and a taxi-type rail electric vehicle or a household rail electric vehicle can be reserved for pickup on time at a right station; a steering mechanism does not have a steering wheel, the vehicle steering can be completed by a main steering wheel and an auxiliary steering wheel through guiding pavement; and the rail electric vehicle can be a bus type, a taxi type, a household type and an online goods delivery and receiving type.

The present invention provides a power source system that increases the power supply capacity of a power source device and continuously supplies the power necessary for a load device when a power source device stops. A control unit has a state quantity setting unit that sets a first target state quantity indicating a state of charge of the power storage device that is to be a target value when charge and discharge of the power storage device are controlled. When the power source device stops, the state quantity setting unit can change the first target state quantity to a second target state quantity that is to be a target value exceeding the first target state quantity and can increase the target state quantity of the power storage device. As a result, when the power source device stops, charge and discharge of the power storage device are controlled on the basis of the target state quantity exceeding that during the operation of the power source device. Therefore, the state of charge of the power storage device can be improved over that during the operation of the power source device. As a result, the power supply capacity of the power source device can be increased and the power necessary for the load device can be continuously supplied, in place of the power source device.

The invention discloses an expandable battery assembly of wearable equipment, and is used for solving the problem of insufficient power supplying ability of the existing wearable equipment. The expandable battery assembly comprises a fixing component for fixing the wearable equipment, wherein at least two groups of batteries are mounted at the fixing component; or the fixing component is formed by connecting at least two groups of the batteries through a connecting component. As the expandable battery assembly is used, the cruising ability of the wearable equipment is enhanced; and the wearable equipment is fixed by utilizing the batteries. Thus, the development and the popularization of the wearable equipment are accelerated.

The invention provides a three-phase traction electricity supplying system, and relates to the field of urban rail and trunk line railway traction electricity supplying. The secondary edge of a main substation feeds out a three-phase cable; the three-phase cable is parallel to a three-phase traction net; a traction transformer Ti adopts Y / d wiring, the original edge is connected with the three-phase cable, and the secondary edge is connected with the three-phase traction net; the three-phase traction net is composed of a first electricity supplying rail, a second electricity supplying rail anda steel rail which are insulated with one another; the traction transformer Ti adopts the Y / d wiring, the original edge Y wiring of the traction transformer is connected into ABC with the same phase,and three terminals of the secondary edge d wiring of the traction transformer are connected with the first electricity supplying rail, the second electricity supplying rail and the steel rail correspondingly; and a vehicle-mounted electricity supplying system is composed of a vehicle-mounted cable and a three-phase AC-DC-AC convertor, a first single core cable, a second single core cable and a ground wire of the vehicle-mounted cable make contact with the first electricity supplying rail for being energized through an electricity brush, the second single core cable makes contact with the second electricity supply rail for being energized through an electricity brush, the ground wire makes contact with the steel rail for being energized through an electricity brush, and electricity is supplied to the three-phase AC-DC-AC convertor and a three-phase motor.

The invention provides a triphenylamine-thiophene organic dyestuff. The structural general formula of the triphenylamine-thiophene organic dyestuff is as shown in a formula (I), wherein in the formula (I), R1 is C1-C6 alkoxy, the structural formula of Ar is as shown in a formula (II) or a formula (III), and R2 in the formulas (II) and (III) is C1-C6 alkyls. A preparation method of the triphenylamine-thiophene organic dyestuff comprises the following steps: sequentially carrying out Suzuki coupled reaction and Knoevenagel condensation reaction by using aryl bromal, tetrakis(triphenylphosphine)palladium(0), potassium carbonate and alkoxy substituted triphenylamine boron ester as raw materials, thus obtaining a target product. The triphenylamine-thiophene organic dyestuff can serve as a photosensitizer of a dye-sensitized solar cell. The triphenylamine-thiophene organic dyestuff has the advantages that the distortion spatial structure of alkyl triphenylamine is capable of effectively suppressing the electron recombination and increasing the open-circuit voltage; a thiophene derivative serving as a dyestuff molecule conjugated bridge is capable of ensuring the high molar absorption coefficient and has relatively strong power supply performance, so that the ideal photoelectric conversion efficiency is ensured.

The invention relates to a solar energy power supply apparatus formed by a portable case body, a solar energy photovoltaic cell panel arranged on the front and back surface of the case body, an automatic charge-discharge control circuit including a direct current- direct current (DC-DC) voltage transforming circuit and a direct current-alternating current (DC-AC) transforming circuit, a liquid crystal display (LCD) arranged on the surrounding frame of the case body, a voltage output interface for notebook computer, a USB output interface used for power supply or charging for digital electronic products, an AC 220V output socket, a DC emergency charging input interface, an automobile storage battery charging output interface, and a convenient setting combination hub specially used for lamp-post of high-efficient energy-saving light formed by a collapsible supporting rod which serves the purpose of a lamp-post and a LED lamp holder. The invention has advantages of high power supply capability, wide applicability, strong practicality, safety and reliability and can satisfy the normal power supply of basic electricity utilization in communication, business and daily life in no AC 220V power-supply environment, and the invention is especially suitable for high illumination needed for earthquake relief work in remote mountain area, travelling and dark environment.

The invention provides a power supply system in which power supply capacity of an electric power accumulator can be increased temporarily when normal power supply is stopped, a power supply control method of the power supply system, a power supply control program of the system, and a computer readable recording medium having power supply control program of the system recorded thereon. Upon receiving normal power supply stop information from an integral control ECU, a control section lowers an operatable voltage determined as an output voltage for ending discharge of the electric power accumulator and delivers the lowered operatable voltage from a communicating section to the integral control ECU. Based on the lowered operatable voltage, the integral control ECU controls a charge / discharge controller to increase power supply capacity of the electric power accumulator.

The invention discloses an island dividing method for a power distribution network comprising distribute generation (DG). The island dividing method relates to the field of power supply technologies. The island dividing method implements the optimal island system formation method under the condition of considering output of the DG and load demand uncertainty, can determining the maximum possible island according to real-time situation, and has higher reliability when compared with an island under the condition of certainty. The island dividing method comprises the steps of: establishing a probability model of the DG and loads while considering output of the DG and load demand uncertainty, adopting a Monte Carlo method to carry out sampling tests, and predicting power supply output and load demand; simplifying a topological structure of the power distribution network into an undirected weighted graph while considering importance of the loads; solving an island dividing model by adopting an improved firefly algorithm to obtain a preliminary island; and adjusting and verifying the preliminary island by adopting a probabilistic power flow and sensitivity verification algorithm.

The invention relates to a traction power supply network tail end voltage boosting device with a power fusing function and a method of the device. The device includes a multiple voltage reduction module and a power-fusing current-converting module; the multiple voltage reduction module is connected into two power supply arm power sources of the tail end of a traction power supply network and includes two single-phase multi-winding transformers of the same structure which are correspondingly connected into the two power supply arm power sources respectively through connection switches; the power-fusing current-converting module is used for performing energy conversion on the two power supply arm power sources and includes a plurality of current conversion sub modules; one set of voltage is connected into two input sides of each current conversion sub module through corresponding secondary windings of the two single-phase multi-winding transformers, so that energy conversion can be performed; and through controlling the switch-on of the current conversion sub modules, output voltage can be boosted, and power fusion of the two power supply arms can be performed. According to the method of the invention, the voltage of the tail end of the traction power supply network can be stabilized and boosted through controlling the power-fusing current-converting module. The device and the method of the invention have the advantages of simple structure, low cost, power fusion and train power network resonance suppression, and can boost the voltage of the tail end of the traction power supply network.

The invention discloses a power supply for a solar power supply wireless sensor network node and a power supply method. The power supply battery comprises a control module, a rechargeable battery controlled by the control module, a solar battery panel, an illumination sensor and a wireless communication module connected with the control module, a voltage / current detection circuit, and a terminal computer in bidirectional communication with the control module. The power supply method comprises the following steps of: inputting a preset value by the terminal computer, storing the preset value in an electrically erasable programmable read-only memory (EEPROM), reading Vflag in the EEPROM, and judging whether the Vflag is equal to 1; when the Vflag is equal to 1, entering a charging mode; and when the Vflag is equal to 0, correspondingly adjusting the sampling period according to the output voltage value of the rechargeable battery periodically detected by the voltage / current detection circuit. The power supply has reasonable design, low cost, low power consumption and reliable working performance, and ensures that the power supply battery can provide as long working time as possible for the wireless sensor node in different states.

The present invention provides a seawater battery, which comprises an electrolyte, a cathode and an anode. The electrolyte is seawater, the cathode and the anode are separated from each other and respectively contacted with the electrolyte to enable an electrochemical reaction of the electrolyte respectively with the cathode and with the anode, so as to generate a potential difference between the cathode and the anode. In which, the anode contains a first material, and at least one of the anode and the cathode is selected for comprising a plurality of carbon nanotubes. Thus, the present invention employs the carbon nanotubes to fabricate the electrodes of the seawater battery for increasing the current density of the current formed by the potential difference, so as to effectively enhance the power supply performance of the seawater battery.

The invention provides a coaxial cable power supply system of an electrified railway. The coaxial cable power supply system is composed of a center traction substation, coaxial cables, traction transformers, a contact system, a steel rail, circuit breakers and the like, wherein the center traction substation is connected with the coaxial cables; the coaxial cables are erected parallel with the contact system; the traction transformers are in single-phase connection, and are distributed along the coaxial cables and the contact system at certain intervals; a primary winding of each traction transformer is connected between an inner conductor and an outer conductor of the corresponding coaxial cable in parallel; a secondary winding of each traction transformer is connected between the contact system and the steel rail in parallel; the inner conductors of the coaxial cables are connected in parallel with the contact system by the adjacent traction transformers; the outer conductors of the coaxial cables are connected in parallel with the steel rail by the adjacent traction transformers. According to the coaxial cable power supply system, the power supply capacity and the voltage level are mainly determined by the coaxial cables; therefore the system is applicable for matching between the coaxial cables and various voltage grades of the contact system, and is beneficial to improving the light suspension and the overall quality of the contact system; the coaxial cables are erected along a railway or a subway tunnel without occupying additional corridors, so that interfaces between the railway and the public power grid can be reduced, the external power investment can be saved, and the management is facilitated.