104 results about "Power flow" patented technology

The invention provides a control method of a flyback converter. The control method is a control method in a mixed control mode; in other words, the flyback converter works in a non-complementation state under light loads, the clamp switch pipe on time is shortened through down conversion, and light load losses are effectively reduced through down conversion; flyback converter works in a fixed-frequency drive complementation state under heavy loads, and the clamp switch pipe on time is prolonged. Compared with the prior art, the control method has the advantages that the voltage stress of a main switch pipe and a clamp capacitor can be effectively reduced, the main switch pipe off losses can be reduced, the clamp circuit current change slope is decreased, the EMI interference is reduced, the secondary current change slope is decreased, and the longer detection reaction time is provided for synchronous rectification. Meanwhile, the working area of a magnetic core in the third quadrant is enlarged, the maximum flux density is reduced, and the size of the magnetic core is reduced.

A stent delivery and apposition detecting system includes at least one electrode pair of dissimilar metals mounted on a balloon of a balloon catheter. The electrode pair forms part of an electrochemical cell, and voltage and current generated from the electrochemical cell enables the system to detect when a stent mounted on the balloon achieves proper wall apposition. As the balloon is exposed to different environments, i.e., blood or tissue having different resistances, the electric potential of the electrochemical cell changes and an alert is generated by a feedback circuit to notify a user that the electrodes are in contact with tissue of the vessel wall. In one embodiment, the feedback circuit may be powered by the electrochemical cell. Multiple sets of electrode pairs may be mounted along the circumference and length of the balloon to detect differential contact between the deployed stent and the vessel wall.

A circuit configuration for an electric machine, e.g., a starter motor for starting an internal combustion engine in a motor vehicle, includes a current limiting device for limiting a starting current of the electric machine. The circuit configuration includes a bridging device for bridging the current limiting device.

The present disclosure suggests methods of selecting a stimulation site for stimulating a patient's brain or methods of effectuating a neural-function of a patient associated with an impaired body function. In one exemplary implementation, such a neural function may be effectuated by selecting a stimulation site, positioning at least a first electrode at the stimulation site, and applying an electrical potential to pass a current through the first electrode. If one aspect, this stimulation site may be selected by a) identifying a second body function that is a corollary to the impaired body function, and b) determining a corollary location of the patient's brain that is associated with the second body function and is ipsilateral to the impaired body function.

The invention relates to an inverter electric welding machine device with adjustable electric arc, which comprises a welding host machine, a welding torch, a liquid cooling system, a compressed air supply device, a protective gas supply device and an electric arc adjusting device, wherein the welding torch comprises a handle, a main cylinder body, a nozzle, an outer bushing, an inner bushing, a compression screw, a tungsten stick, a ceramic sleeve and a fixed sleeve. An electric arc adjusting device comprises an electric adjusting mechanism, and a control circuit of the electric arc adjusting device mainly consists of a push-and-pull coil and a reversing switch; the direction of current can be changed by switching the reversing switch, namely, the magnetic induction polarity of the push-and-pull coil can be changed, so that the moving direction of an induction magnet coil is forced to be changed, and the inner and the outer bushings of the welding torch are driven to change the moving direction of the tungsten stick; and a manual adjusting mechanism consists of an adjusting disc and a rotating sleeve, wherein the adjusting disc is manually rotated to drive the rotating sleeve to rotate, and the inner and the outer bushings moves up and down to drive the tungsten stick to move by mechanical transmission. The inverter electric welding machine device has the advantages that one welding machine can realize two electric arc types; free electric arc continuous compression can be converted into plasma electric arc; and the structure is simple, and the use is convenient.

The invention discloses a light emitting diode epitaxial wafer and a preparation method thereof, and belongs to the technical field of semiconductors. The epitaxial wafer comprises a substrate, and a buffering layer, an N-type layer, a stress release layer, a multi-quantum-well layer and a P-type layer which are stacked on the substrate in sequence, further comprises a first current extending layer stacked between the stress release layer and the multi-quantum-well layer, and a second current extending layer stacked between the multi-quantum-well layer and the P-type layer, wherein each of the first current extending layer and the second current extending layer comprises a plurality of AlxGa(1-x)N layers and InyGa(1-y)N layers which grow alternately, wherein x is greater than 0 and smaller than 1, and y is greater than or equal to 0 and smaller than 1; the AlxGa(1-x)N layers and the InyGa(1-y)N layers in the first current extending layer are doped with N types, and the AlxGa(1-x)N layers and the InyGa(1-y)N layers in the second current extending layer are not doped. The light emitting diode epitaxial wafer can prevent a light emitting diode from failing.

This invention provides an initiating device 10 for an electronic detonator, which includes two spaced electrical conductors 12 located on an insulating substrate 14; and two separate resistive means in the form of thick film resistive bridges 16 extending between the electrical conductors 12, for releasing energy upon application of an electrical current to the resistive bridges 16. An explosives or pyrotechnic composition, generally designated by reference numeral 18, covers the resistive bridges 16. It will be appreciated that should one of the bridges 16 fail, the other bridge 16 would still initiate the device 10. The size of the contact interface between the bridge 16 and the explosives composition 18 is also doubled, making the initiating device 10 even more reliable. As a result the initiating device 10 is suitable for a wide range of different applications.

Systems and methods for dynamic AC line voltage regulation are provided. A simple and cost-effective method for achieving AC line voltage regulation in AC systems including split-phase systems, of which the voltage for each voltage line may be regulated over a specified range, is provided. Buck and boost regulation is achieved for lowering or increasing the line voltage, respectively, with reference to the incoming grid voltage. Systems for dynamic AC line voltage regulation may comprise an AC/AC converter which uses fractionally rated switches and magnetics that handle only a fraction of the load current, resulting in lower costs. The use of an AC snubber further provides safe and robust switching of the main switching devices by eliminating failure prone switching sequences that are dependent on accurate assessment of voltage and/or current polarity for AC or bi-directional switches.

A control device for a DC-DC converter includes a PWM controller for generating a PWM signal to a switch module of the DC-DC converter according to a feedback signal of the DC-DC converter, a logic circuit for generating a selection signal according to a magnitude of an output current of the DC-DC converter, and a multiplexer coupled to a plurality of voltages for selecting one of the plurality of voltages to be a supply voltage according to the selection signal.

The invention relates to the technical field of photovoltaic modules, in particular to a novel interconnection strip for a photovoltaic solar module and battery plates for matched use. The interconnection strip is provided with a strip body, one end of the body is a thin part, the other end of the body is a wide part, the thin part is welded with main grid lines on the fronts of the battery plates, and the wide part is welded on a back electrode at the backs of the battery plates so as to increase the area of the interconnection strip, decrease the series resistance between the battery plates, lessen the line loss of the current on a welding strip of the interconnection strip and increase the output power of the module.

The present invention relates to a phacoemulsification handpiece, comprising a needle and a microelectromechanical system (MEMS) device, wherein the needle is coupled with the MEMS device. The phacoemulsification handpiece may further comprise a horn, wherein the horn is coupled with the needle and the MEMS device. The MEMS device is capable of generating movement of the needle in at least one direction, wherein at least one direction is selected from the group consisting of transversal, torsional, and longitudinal. The present invention also relates to a method of generating movement, comprising providing a phacoemulsification handpiece, wherein the handpiece comprises a needle and one or more MEMS devices; applying a voltage or current to the one or more MEMS devices, wherein the MEMS devices are coupled with the needle; and moving the needle in at least one direction. The present invention also relates to a vitrectomy cutter comprising one or more MEMS devices.

The invention relates to a reactance relay and a re-closing method, the reactance relay is based on the current of a fault point of a mixed circuit of a high-voltage cable and a trolley wire, the reactance relay based on the current of the fault point is the reactance relay based on information of momentary current on two sides of the circuit, the momentary current on two sides of the circuit is utilized, capacitance current of a trolley wire circuit and a cable circuit and the current of a shunt reactor of the trolley wire are compensated, and the precise current of the fault point can be obtained by calculation. As for the mixed circuit of the high-voltage cable and the trolley wire without the shunt reactor, a protector on the trolley wire side is used for judging whether the re-closing is started or not, the protector on the trolley wire side always adopts the synchronous check way for superposition, the action range of the reactance relay is set to the junction of the trolley wire and the cable, if the reactance relay acts, a fault occurs in the trolley wire circuit, the re-closing is started, otherwise, the re-closing is locked. The re-closing is started when the fault occurs in the trolley wire of the mixed circuit, and the re-closing is locked when the fault occurs in the cable.

The invention discloses an electrostatic type lampblack purifier lampblack monitoring cleaning system and a monitoring cleaning method. The electrostatic type lampblack purifier lampblack monitoring cleaning system comprises a purifier data collector arranged on a power supply circuit of an electrostatic type lampblack purifier and a fan data collector arranged on a fan, an analog-digital conversion unit, an industrial personal computer and a background server, wherein the analog-digital conversion unit is used for changing a current signal collected by the purifier data collector and the fan data collector into a digital signal so as to be sent to the industrial personal computer; the industrial personal computer is provided with a GPRS (general packet radio service) data transmitter module, the background server is provided with a GPRS data sending-receiving module, so that the data of the industrial personal computer is transferred to the background server so as to carry out real-time monitoring. The invention also discloses a lampblack monitoring cleaning method of the electrostatic type lampblack purifier. The purifier data collector collets an I practical peak value and an I practical valley value in each interval setting time, and the industrial personal computer executes a sweeping task according to a setting algorithm.

The invention provides a manufacturing method of a winding type lithium ion battery and the winding type lithium ion battery, and relates to the technical field of lithium ion batteries. The method comprises the following steps: punching a foil on one side of a positive pole piece and a foil on one side of a negative pole piece to be saw-toothed to form a saw-toothed positive pole piece and a saw-toothed negative pole piece; arranging an isolating film between the saw-toothed positive pole piece and the saw-toothed negative pole piece in a laminating mode for winding to form multiple layers of positive tabs and multiple layers of negative tabs. The battery comprises an outer composite aluminum plastic film and a multi-tab lithium ion cell, wherein the multi-tab lithium ion cell comprises the positive pole piece, the isolating film and the negative pole piece which are laminated and then wound; one side of the positive pole piece and one side of the negative pole piece adopt saw-toothed structures, and the positive pole piece and the negative pole piece are wound to form the multiple layers of positive tabs and the multiple layers of negative tabs. The production efficiency of a Z-shaped lamination battery is improved, the potential safety hazard of a Z-shaped lamination process in assembly is reduced, the internal resistance of the battery is reduced, and large current discharge is achieved.

The present invention introduces method and device for automatically collecting bee venom. The biological characteristic of worker bee, which is low voltage and small current stimulated to stick and expel venom, is utilized in automatically collecting bee venom. The device for automatically collecting bee venom consists of AC or DC power source, automatic AC or DC controller, and bee venom collector. The device has simple control circuit structure, easy making, low cost and small size, and is especially suitable for collecting bee venom.

A rearview head hoop mainly comprises a casquette hoop, a main control unit and a hand-waved charger, the casquette hoop is provided with a display screen, a camera, a lamp, a flexible headset, a tightening band and a sucking socket, the main control unit is connected with the casquette loop through a control bus, the current output wire of the hand-waved charger is movably connected with the main control unit, and a tightener is mounted on the tightening band. The embodiment can ensure that the scene near the heels can be conveniently and clearly seen, radio or other music programs can be listened during exercise, the lamp can be utilized for backward walking even in the dark environment, other video programs can be watched during rest halfway, and in the process of exercise, the power supply can be charged. Consequently, the rearview head hoop has the advantages of reasonable structure, convenient operation and safe use.

The invention discloses a boosted circuit and a signal output method. The boosted circuit comprises a boosted module, a boosted control module, a ripple signal generation module and a voltage given signal generation module. The boosted control module carries out sampling on an inductance current signal of the boosted module and an output voltage signal. According to a ripple signal, a voltage given signal, the voltage signal and the inductance current signal, wherein the voltage signal and the inductance current signal are acquired through sampling, a driving pulse signal is generated. The boosted module completes a boost change to an input voltage signal under the control of the driving pulse signal and provides direct voltage signal output possessing a ripple component. Because the ripple signal generation module is newly added, the boosted module outputs a voltage signal possessing the ripple component. A backward-stage direct current/direct current link directly generates a jitter frequency effect because the input voltage signal possessing the ripple component so that an electromagnetic interference problem of a power supply system is alleviated.

The invention discloses a method for optimizing fuel cell performance based on frequency and a secant angle. The method comprises the steps that in the working condition of the optimal temperature and humidity at which the total internal resistance Rstack of a PEMFC is minimal, the internal resistance of each galvanic pile segment at the moment is measured, and the ideal high-frequency corner frequency f<optimal> and ideal secant angle alpha<optimal> of different electric current densities are acquired correspondingly; with the f<optimal> and the alpha<optimal> as optimization indexes, focusing on the galvanic piles in any working condition, it is only necessary to emit two frequency signals of the highest frequency (20 KHz) and the ideal corner frequency f<optimal> to monitor the current alpha angle, and through uninterrupted adjustment of relevant control variables, the current alpha angle is changed and tends toward the optimal angle alpha<optimal>, so that the galvanic piles are adjusted to the optimal working state. According to the method, improvement is conducted on traditional EIS methods, and the total internal resistance Rstack is quickly calculated by means of a simultaneous equation solution method; not only is optimization of the galvanic pile output performance of the PEMFC achieved from the internal resistance angle, but also the defects that by means of the traditional EIS methods, the hysteresis is large and real-time detection cannot be conducted are overcome, and operation is simpler and the optimization performance is better compared with traditional methods.

The invention discloses a leakage protection device which can prevent electric shock accidents caused by faults of electric equipment and also can prevent the electric shock accidents caused by the fact that an earth wire is electrified accidently. The leakage protection device is also provided with a weak current detection sensor, a voltage comparator circuit and a one-way output circuit; an iron core of the weak current detection sensor is wound by a primary winding and a secondary winding; a detection circuit which is formed by serially connecting the primary winding with a current-limiting capacitance resistance element is connected between the earth wire and a neutral wire; a standard voltage obtained from a stable-voltage power supply is input into an input end of the voltage comparator circuit; an output end of the secondary winding of the weak current detection sensor and the other output end thereof are respectively connected with the other input end of the voltage comparatorcircuit and a cathode of the output end of a rectifying circuit; and the output end of the voltage comparator circuit is connected with a driving circuit of an electromagnetic coil through the one-way output circuit.