374results about How to "Meet power requirements" patented technology

The invention discloses a clean alcohol ether-base gasoline, prepared of alcohol-base fuel mixed solution, naphtana etherified liquid, C-5 and cleaning agent; and its components in weight percent (wt%): alcohol-base fuel mixed solution 40-50, C-5 10-20, naphtana etherified liquid 30-45, cleaning agent 0.1. The alcohol-base fuel mixed solution is composed of methanol, acetone, hydrogen peroxide, ferrocene-benzene solution and camphor powder. The naphtana etherified liquid is prepared by etherifying naphtana, methyl-tert-butyl ether and isopropyl ether. The finished oil has rich HO molecular groups, high oxygen content and can fully burn. After it is used, the indexes of various harmful matters in the discharged tail gas from engines are obviously lower than those of ordinary gasoline and environmental protection.

An electric torque converter has a torque converter input member connected to the first node of a differential gear set representable by a lever diagram having first, second, and third nodes. A motor / generator is connected to the second node. The third node is connected to an input member of a transmission gearing arrangement. A brake is selectively engagable to ground the first node to a stationary member. Engagement of the brake provides a regenerative braking mode and an electric-only driving mode, with the motor / generator connected to the transmission gearing arrangement through the differential gear set. Various clutches may be provided for lock-up or selective connection of the engine, including arrangements which reduce motor / generator torque required for engine starting while in electric-only driving. A method of operating a vehicle maintains the engine speed at an optimum level to the extent possible given battery charge levels and operator commands.

The invention discloses a remote-sensing wild automatic monitoring system and method for shallow lakes. The system comprises a supporting platform, a power supplying system, a data acquisition system, a data transmission system and a data center, wherein the supporting platform comprises a platform supported by a plurality of piles and an instrument room established on the platform; the power supplying system is used for supplying power to the data acquisition system and the data transmission system; the data acquisition system comprises a weather sensor, a hydrological sensor, a water quality sensor, a water surface imaging spectrum acquisition system, an underwater optical field simultaneous monitoring system and a camera; the data transmission system is connected with the data acquisition system and is used for transmitting various types of lake water color remote sensing information acquired by the data acquisition system to the data center. The system and the method disclosed by the invention are suitable for carrying out remote-sensing wild monitoring and researches of lake water color and algae bloom in regions in which the sites of algae bloom in an eutrophicated lake are relatively fixed and frequency of algae bloom is high.

The invention discloses a double-temperature control system for a passenger compartment and a power battery of a fuel cell vehicle. An output end of an electric compressor is connected to a port A ofa four-way reversing valve; a port B, a forecabin heat exchange module, a one-way valve parallel connection section, a refrigerant parallel connection section and a port C of the four-way reversing valve are sequentially connected in series; a port D of the four-way reversing valve, a gas-liquid separator and an input end of the electric compressor are sequentially connected in series; the refrigerant parallel connection section comprises a first refrigerant branch and a second refrigerant branch which are arranged in parallel, a cooling liquid outlet of a battery heat exchanger is connected to a cooling liquid inlet of a power battery system, and a cooling liquid outlet of the power battery system, an expansion water tank, a water pump and a cooling liquid inlet of the battery heat exchanger are sequentially connected in series. On the premise that the system is simplified, independent control over the passenger compartment temperature and the power battery temperature is achieved, abattery pack temperature and the battery cooling inlet temperature are adopted as power battery temperature adjusting parameters, the influence of thermal delay is avoided, and the temperature controlprecision of the power battery is improved.

The invention discloses a lithium ion battery capable of being subjected to high-rate charge and discharge and a preparation method thereof. The lithium ion battery capable of being subjected to high-rate charge and discharge comprises a positive pole, a negative pole and a diaphragm, wherein the positive pole comprises the following components in percentage by weight: 80-98% of positive active material, 1-19% of conductive agent and 1-19% of binder; the negative pole comprises the following components in percentage by weight: 80-98% of negative active material, 1-19% of conductive agent and 1-19% of binder; the positive active material includes one or two of Li(NiCoMn)O2 and lithium manganate; the negative active material includes one or two of hard carbon and soft carbon; the conductive agent is one of superconducting carbon black, carbon fiber, crystalline flake graphite and a carbon nanotube; and the binder is one of kynar, butadiene styrene rubber, sodium carboxymethylcellulose and hydroxypropyl / carboxymethyl cellulose. According to the lithium ion battery capable of being subjected to high-rate charge and discharge and the preparation method thereof disclosed by the invention, the lithium ion battery has high-rate charge and discharge characteristics, and is good in charge and discharge characteristics, wide in temperature application range, excellent in low-temperature charge performance, long in cycle life and high in safety.

The invention discloses a split type flat-plate solar photothermal and photovoltaic system, and belongs to the technical field of water heating equipment. The system comprises a solar photovoltaic generation component, a flat-plate solar thermal collector, an adjustment controller, a storage battery, an inverter, a power supply control cabinet, a controller, a water tank and a circulating pump, wherein the solar photovoltaic generation component is connected with one end of the flat-plate solar thermal collector; the flat-plate solar thermal collector is provided with a pipe type heat absorber; a water inlet and a water outlet of the pipe type heat absorber are connected with the water tank; the adjustment controller is connected with the inverter; the inverter is connected with the power supply control cabinet; the power supply control cabinet is connected with the controller; the storage battery is connected with the adjustment controller; an electric heater is arranged in the water tank and is in electrical connection with the controller; the water tank is provided with a tank upper water level sensor and a lower water level sensor; and the circulating pump is arranged on a pipeline and is in electrical connection with the controller through a circuit. The invention has the advantages that the system avoids light influence, and meets requirements of the water tank for continuous water supply.

The invention discloses a high-performance clean methanol gasoline which has the advantages of low cost and high efficiency. The methanol gasoline comprises the following components in percentage by weight: 15 to 48 percent of methanol, 50 to 84 percent of crude gasoline and 1 to 2 percent of composite additive, wherein the composite additive comprises the following components in percentage by weight: 15 to 20 percent of multi-effect energizer, 30 to 41 percent of benzene compound, 0.5 to 24 percent of complexing agent, 8 to 24 percent of ether compound, 0.7 to 1.2 percent of detergent additive and 16 to 19 percent of multi-carbon alcohol. The product of the invention has the advantages of readily available raw materials, wide source and low cost, can meet the requirements of No.93 unleaded petrochemical gasoline and above when used as a vehicle fuel, can be used independently or mixed with gasoline and is not limited by the proportion and the engine does not need to be retrofitted inuse.

The invention discloses a high-voltage capacitor bank branch current monitoring device, comprising a self-excitation energy obtaining and power converting circuit, a current detection and acquisition circuit, a CPU data acquisition and controlling circuit and a wireless transceiving circuit, the self-excitation energy obtaining and power converting circuit obtains energy from the high-voltage line and converts and outputs direct voltage; and the current detection and acquisition circuit collects current instantaneous value, and outputs to the CPU data acquisition and controlling device, which is used for finishing branch unbalanced current AD alternating current sampling, current harmonic calculation and finishing bidirectional wireless digital transmission via the wireless transceiving circuit. The monitoring device solves the problem of monitoring protection of a capacitor bank under high potential, discloses the damage mechanism of the capacitor bank by taking the branch unbalanced current and harmonic distribution in the fault process of the capacitor bank as the analysis basis, thus reducing fault rate of the capacitor bank and having significant meanings in improving power grid safe operation level and economic efficiency.

The invention provides a solar optothermal coupled high-temperature water electrolysis hydrogen production system. The system comprises a heat energy supply module, a hydrogen production and separation module and a storage module which are sequentially connected; the heat energy supply module comprises a condensation device, a heat collection device, a heat storage high-temperature heat pipe heat exchanger and a heat exchanger unit which are sequentially connected, and hydrogen and hydrogen are separated through electrolysis after a water and hydrogen mixture in the hydrogen production and separation module is heated into a steam and hydrogen mixture above 800 DEG C. Compared with the prior art, the hydrogen production system has the advantages that fossil energy does not need to be consumed, the productive process is more green and environmentally friendly, and the power consumption is greatly reduced; a stable heat source is provided through the system, the problem that a photo-thermal system is not stable due to changes in the weather is solved, the availability of the system is improved, and meanwhile the electrolytic efficiency of the system is improved.

The invention relates to an Al-Ga-In-Sn-Zn alloy as well as a preparation method and an application thereof. The alloy is prepared from the following components by weight percent according to a mechanical alloying technique: 45-97wt% of metal Al, 1-20wt% of metal Ga, 0.5-15wt% of metal In, 1-10wt% of metal Sn and 0.5-10wt% of metal Zn. The alloy of the invention can directly react with water at the temperature of larger than or equal to zero DEG C so as to realize the effect of rapidly producing hydrogen; and hydrogen-producing rate reaches more than 90% of a theoretical value, and the reaction rate reaches 200ml / min.s, thereby meeting the dynamic powder requirement of hybrid electric vehicle travelling and greatly improving the utilization rate of gasoline.

The invention relates to a medium-sized pure electric bus chassis which comprises a chassis body, a first front wheel, a second front wheel, a first rear wheel, a second rear wheel, a front axle and a rear axle, wherein the first front wheel, the second front wheel, the first rear wheel, the second rear wheel, the front axle and the rear axle are arranged on the chassis body, the front axle is arranged between the first front wheel and the second front wheel, and the rear axle is arranged between the first rear wheel and the second rear wheel. An electric steering system, a power source system, a driving system, a control system and a brake system are arranged on the chassis body. The electric steering system is positioned in the front section of the chassis body, the power source system is positioned in the middle section of the chassis body, the driving system and the control system are positioned in the rear section of the chassis body, and the brake system is distributed on the whole chassis body in a penetrating manner. Electric energy serves as a power source, the power performance and safety of a power system can be ensured when a bus runs, and zero emission, energy conservation and environmental protection can be realized.

The invention discloses an unattended house management system based on a narrow-band internet of things. The system comprises an intelligent door lock with a password unlocking function, a rental system server and a mobile phone APP. The server stores rental status of a house, and stores and sends room number, the state of the intelligent door lock corresponding to the room number and a control command for the intelligent door lock, and stores the room number and passwords of the intelligent door lock corresponding to the room number to one database. The mobile phone APP obtains the room number, the state of the intelligent door lock corresponding to the room number and the passwords of the intelligent door lock, controls the state of the intelligent door lock and the passwords of the intelligent door lock, and realizes renting and not renting in the rental system server. The rental system server resets the passwords of the intelligent door lock when the mobile phone APP transmits a not-renting signal, the passwords being random passwords. The intelligent door lock adopts a narrow-band internet-of-thing communication module to communicate with the rental system server.

The invention discloses an automatic classification system. The automatic classification system is designed based on a YOLOV3 technical framework, so that garbage is classified and recycled, garbage pollution is reduced, and meanwhile waste is recycled to the maximum cost. A box body of a structure with an upper layer and a lower layer is designed in the system, a garbage throwing-in opening is formed in the upper layer of the box body, a camera is mounted, an isolation layer is arranged at the upper top of the upper layer of the box body and used for mounting of a solar panel and a storage battery, and therefore the power supply requirement of the system is met. The camera captures thrown-in garbage, and garbage types are recognized and classified through a recognition algorithm. The lower layer of the box body is designed into dual boxes or multiple boxes according to the garbage classes. A mechanical-electric control part is mounted at the joint of the two layers of the box body, two steering engines control rotation of a classification baffle and a control baffle so as to automatically drive garbage to fall into classification boxes corresponding to the types of the garbage. The automatic classification system can achieve garbage automatic classification.

The embodiment of the invention discloses a wireless power supply method and device for high-voltage on-line monitoring equipment. With the method and device, a problem of low power supply reliability of the wireless power supply method of the existing high-voltage on-line monitoring equipment and problems of a power supply distance, power and efficiency, power supply stability and reliability, and power supply cost can be solved. The method comprises: step one, an energy-taking coil takes energy out from a high-voltage bus in an electro-magnetic induction manner and AC / DC and DC / AC voltage conversion is carried out to convert 50-Hz alternating currents into high-frequency alternating currents; step two, a transmitting coil disperses the energy of the high-frequency alternating currents to the surrounding space and thus a high-frequency electromagnetic field is formed in the space, targeted transmission of the energy is carried out by using a domino relay coil, and a receiving terminal receives the energy; and step three, after the receiving terminal receives the energy, power conversion processing is carried out and then the converted power is provided for a storage battery and a load.

The invention discloses an energy storage system of a power battery for an echelon utilization vehicle. The energy storage system comprises an echelon utilization battery management system, a bidirectional energy storage converter, a power control system, an intelligent power distribution system and a monitoring dispatching system, wherein the echelon utilization battery management system is accessed to the intelligent power distribution system and is respectively in communication connection with the power control system and the monitoring dispatching system, and the power control system is respectively in communication connection with the bidirectional energy storage converter and the monitoring dispatching system. With the energy storage system of the power battery for the echelon utilization vehicle, the echelon utilization battery energy storage system is built by means of the power battery and is mainly used for storing energy of a valley load and supplying power to an important load during a load peak stage; and the energy storage converter in the echelon utilization battery energy storage system is used for stably switching between a voltage power off-line mode and a current source grid-connected mode, and the safe power supply of the load and the stable running of the echelon utilization battery energy storage system shall be ensured during the switching process.

A converter ECU (2) obtains allowable power total value including at least one of discharge allowable power total value ΣWout of discharge allowable power Wout1, Wout2 and charge allowable power total value ΣWin of charge allowable power Win1, Win2. Then, the converter ECU (2) determines which of the allowable power total value and an actual power value is greater, If the actual power value is smaller than the allowable power total value, the converter ECU (2) controls a converter (8-1) such that an input / output voltage value Vh attains a prescribed target voltage value, and at the same time controls a converter (8-2) such that a battery current value Ib2 attains a prescribed target current value.

A hybrid power supply includes a first battery array, a second battery array, and a controller. The first battery array includes a plurality of first battery packs. The second battery array includes a plurality of second battery packs. The controller controls charging and discharging of the first battery array and the second battery array. The second battery array is connected in parallel with the first battery array by at least a bidirectional converter. The first battery array and the second battery array are connected to a power bus for outputting power. The first battery array has a high-rate charging / discharging performance higher than the second battery array. The second battery array has a capacity greater than the first battery array.

The invention relates to a layered and partitioned power distribution network frame programming method, which is characterized by comprising the steps of partitioning the whole urban power distribution network gird structure; calculating the power supply capacity of a power grid of a programmed area according to a linear programming method; establishing a two-level multi-objective joint programming model for joint optimization by the aid of an idea of layered programming; transforming and analyzing a two-level multi-objective programming problem; carrying out joint coding on the grid structure and the partitioning mode by adopting a joint coding mode; and processing codes by adopting a two-level multi-objective genetic algorithm according to joint coding so as to acquire a programming operation result. Provided by the invention is a joint programming optimization method based on combination of the two-level multi-objective optimization generic algorithm based grid structure and the partitioning mode, thereby being capable of improving the rationality of power grid programming optimization to a certain degree. Meanwhile, the existing grid frame is sufficiently utilized, thereby saving the construction cost, and enabling the new grid frame to not only meet power supply requirements but also have high economy.

The method includes steps: comparing sum of transmission power of all channels in time slot of forwarding link with maximal transmission power in base station; if the result is larger, next, seeking out the user with maximal transmission power in users in current time slots; then, reducing power with one step length, and repeating the procedure till the said sum is less or equal to maximal transmission power in base station. Then, the method carries out following steps further: comparing the difference between transmission powers of any two channels in current time slot with allowable dynamic range; if the result is larger, seeking out the user with minimal transmission power in users in current time slots; then increasing power with one step length; and repeating the procedure till the said difference is smaller than or equal to allowable dynamic range. Comprehensive considering power control commands of each UE in a time slot, the invention meets power requirement for each UE.

The invention relates to a voltage transform device of fuel battery group used in electric automobile. It consists of a DC / DC module or multi DC / DC modules and an even current control module. The voltages output from each DC / DC module being connected in parallel and then connected to adjusting end of voltage in the even current control module. The current sense signal output from each DC / DC module is connected to the collected end of current signal of the even current control module. The even current control signal output from the even current control module connects to the input end of the even control signal in each DC / DC module. The DC / DC modules make output power supply of the fuel battery raised to stable power with enough high voltage and high stability, in order to meet the requirement for driving electric automobile. The output voltage of the fuel battery can be adapted to the lower but with large range of variation and its pwoer can be more than 160 KW.

The invention discloses a high-power light emitting diode (LED) driving circuit, which is characterized by comprising a rectification module, a driving module, a voltage transformation module and a light source module, wherein the rectification module is used for rectifying input alternating current; one end of the driving module is connected with the rectification module; and the voltage transformation module and the light source module are connected with the other two ends of the driving module. The high-power LED driving circuit is simple in structure, low in power consumption, low in cost and high in stability and provides stable current. The high-power LED driving circuit is provided with an optocoupler feedback loop; the change of output current is small, namely 0.41 to 0.44A within a wide input voltage range from 150 to 250V and a wide LED load changing range (the output voltage range is from 11.4 to 31.5V when 1-3 LED(s) is / are connected in series), the constant current precision reaches + / -5 percent, and the requirement of an LED for power supply can be completely met.

The invention relates to a serial-parallel structure stroke increasing distributed hybrid power system. The system comprises a drive unit, an energy unit and a control unit, wherein the energy unit and the control unit are connected with each other; the control unit is connected with the drive unit; the energy unit comprises a power battery pack and an engine; the drive unit comprises a first electric motor, a speed reducer, a first clutch and a second clutch; the engine and the first electric motor are connected through the first clutch; the first electric motor and the speed reducer are connected through the second clutch; the first electric motor is connected with the control unit; and the drive unit further comprises a left hub motor and a right hub motor which are connected with the control unit. Compared with the prior art, the serial-parallel structure stroke increasing distributed hybrid power system has the advantages that the speed reducer is arranged and replaces a gearbox, so that space is reduced; by the adoption of the hub motors, the transmission efficiency is improved, electronic active differential control of left and right rear wheels and cooperative control of the double clutches are achieved, and requirements for power of different running conditions are met.

A multi-unit linear driving three-range-of-motion loading robot comprises a multi-unit linear driving mechanism, a movable arm lifting mechanism, a fork bucket control mechanism and the like. Full-rod design is adopted for an executing mechanism of the loading robot, controllable motors drive an electric transmission system to provide power, a hydraulic transmission system of an existing hydraulic loading machine is canceled, and thus transmission efficiency is high, energy consumption is low, and reliability performance is good. Under the control of a computer, the multi-unit linear driving mechanism of the robot achieves driving with the multiple low-power motors and high-capacity and high-torque power output, and the heavy-load operation power requirement of the loading robot is met. The loading robot not only has the same characteristics of high transmission efficiency, a high response speed, high motion accuracy, good controllability and the like as a previous controllable loading mechanism but also has better load bearing performance due to the introduction of the multi-unit linear driving mechanism. Large-sized and middle-sized loading robots can be manufactured in this way.

The invention relates to the flow detection field, and refers to a high temperature resistance digital two-wire system HART intelligent vortex flowmeter comprising a high temperature resistance vortex flow sensor, a first stage charge amplifier, a second stage charge amplifier, a first stage low pass filter, a second stage low pass filter, a voltage follower, a voltage-stabiliser tube, a digit power supply management circuit, a simulation power supply management circuit, an electric current loop and HART circuit, a digital isolation circuit, a one-chip microcomputer, a clock manager, a reset circuit, a power supply monitor, a keyboard, an LCD, and a temperature and pressure compensation unit. A signal conditioning circuit employs two-stage charge amplifiers and two-stage low pass filters to solve the problems that the high temperature resistance vortex flow sensor is low in sensitivity; two-path parallel power supplies respectively power up the simulation circuit and the digit circuit, thus solving the problems that the one-chip microcomputer is large in power consumption when doing FFT operation, yet the two-wire system HART intelligent vortex flowmeter requires the system consumed current is lower than 3.5mA. The high temperature resistance digital two-wire system HART intelligent vortex flowmeter can greatly improve measuring range ratio, measuring precision, and anti-interference capability.

The invention discloses an intelligent self-protection power supply for a computer. The intelligent self-protection power supply comprises a main power supply circuit, a super-capacitor battery set, a DC / DC (Direct Current / Direct Current) conversion module and a control circuit, wherein one end of the main power supply circuit is connected with commercial power; the other end of the main power supply circuit is connected with the super-capacitor battery set and the DC / DC conversion module through diodes respectively; one end of the control circuit is connected with the DC / DC conversion module; and the other end of the control circuit is connected with the super-capacitor battery set. When the two-phase commercial power is normally input, the main power supply circuit charges the super-capacitor module on one hand and outputs multiple sets of direct-current voltages through the DC / DC module to supply power to the computer on the other hand; and when the commercial power is abnormal or suddenly interrupted, the control circuit performs a switching action, the super-capacitor module starts to discharge electricity, and the voltage required by the computer is output through the DC / DC module so as to achieve off-delay protection.

The invention discloses austenite heat-resistant valve steel and a manufacturing method thereof. The steel comprises the following components, by mass percentage, 0.45-0.55% of C, 0.08-0.45% of Si, 8.00-10.00% of Mn, 20.00-22.00% of Cr, 3.50-5.00% of Ni, no more than 0.30% of Cu, 0.80-1.50% of W, 0.45-0.55% of N, 1.80-2.50% of Nb, no more than 0.02% of Al, no more than 0.010% of Mg, 0.001-0.01% of Ca, 0.001-0.006% of B, and 0.005-0.020% of RE, with the balance being Fe and inevitable impurities, wherein C+N>=0.09, Nb / C is in a range of 2-5, and (Mn+Si)>=200. The manufacturing method mainly comprises smelting, casting, blooming, rolling, complete solution and aging treatment.

The invention relates to an airborne combined cooling and heating system used for combining a mixed auxiliary power generation device on a multi-electric aircraft and an ammonia absorption-type refrigeration device. The airborne combined cooling and heating system comprises the mixed auxiliary power generation device and the ammonia absorption-type refrigeration device; the mixed auxiliary power generation device mainly comprises a minitype gas turbine, a high-temperature oxide fuel cell, a compressor and the like; the high-temperature oxide fuel cell is used for generating electric energy; the minitype gas turbine utilizes the residual heat waste gas generated by the high-temperature oxide fuel cell to not only be capable of providing the power for the compressor, but also be capable of generating the electric energy; the ammonia absorption-type refrigeration device mainly comprises a generator, a condensation generation device, a condenser, an evaporator and the like; the ammonia absorption-type refrigeration device utilizes the waste heat exhausted by the minitype gas turbine to carry out refrigeration, thus achieving the object of cooling avionic devices; and the refrigeration device sufficiently utilizes the residual heat waste gas for a series of treatment and cools a part of the electronic equipment. The airborne combined cooling and heating system saves both the electric and the energy.

The invention provides a starting circuit for a direct-current switch power supply, which comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a PNP triode Q3, a first NPN triode Q1, a second NPN triode Q2 and a diode D1. The starting circuit for the direct-current switch power supply not only meets the requirement that a switch power supply module supplies the start working voltage to the power supply under the condition of low input voltage, but also overcomes the defect that the conventional starting circuit has large static power consumption under the condition of high input voltage. The starting circuit has the advantages of simple circuit structure, small volume, reliable performance and the like, and has practical application value for the switch power supply working under the condition of wide input working voltage and low voltage start.

The invention aims to provide a double-shaft double-motor ship ammonia-electricity hybrid power system with a fuel cell. The system comprises an ammonia fuel engine, a first reversible motor, a secondreversible motor, a third reversible motor, a diesel generator set, a storage battery, a super capacitor, a fuel cell, a propeller, a liquid ammonia storage and supply device, a power transformationdevice, a ship power grid, a ship load, a whole ship cooling system and an exhaust gas recirculation system. Hybrid propulsion of the ammonia fuel engine and the motor and coordinated power supply ofthe diesel generator set and the energy storage unit can be achieved. Meanwhile, multi-stage utilization of cold energy of the energy storage unit and the engine is achieved, waste gas of the fuel cell supplements gas for the waste gas turbine, the gas inlet efficiency is improved, ship energy consumption is reduced, the whole ship efficiency is improved, and the application range of the system iswidened.

The invention relates to a single-phase electronic type electric energy meter electric source which comprises an industrial frequency transformer T1, a rectification circuit D1, a filter circuit C1, a sampling control circuit, a switch circuit SW1, a voltage reduction DC / DC circuit and a voltage booster DC / DC circuit, wherein industrial frequency AC Vin reduces voltage through the industrial frequency transformer T1 and then obtains an DC voltage end V1 through the rectification circuit D1 and the filter circuit C1; the V1 end is directly connected with an input end of the voltage reduction DC / DC circuit; the voltage reduction DC / DC circuit outputs DC V2 to the voltage booster DC / DC circuit; an output end V3 of the voltage booster DC / DC circuit supplies a stable working electric source for a CPU and a metering chip of an electric energy meter; one end of the sampling control circuit is connected with the V1, and the other end is connected with a control end of the switch circuit SW1; and the input end and the output end of the switch circuit SW1 are respectively connected with the input end and the output end of the voltage reduction DC / DC circuit. The working performance of the electric source with the structure is stable, the production cost is low, and the working scope of an electric source meter can reach AC40 to 400V.