144 results about "Milliampere" patented technology

A device is for the electrotherapeutic treatment of headaches such as tension headaches and migraines. An electrode support (10) has a shape and is size selected so as to allow, independently from the subject, the excitation of the afferent paths of the supratrochlear (2) and supraorbital (3) nerves of the ophthalmic branch (1) of the trigeminal nerve. An electrical circuit includes a programmable signal generator suitable for creating pulses of a duration of between 150 and 450 microseconds with a maximum increase in intensity of 0 to 20 milliamperes at a rate of less than or equal to 40 microamperes per second and with a step up in intensity not exceeding 50 microamperes.

The invention discloses an efficient multi-mode DC-DC converter in a wide voltage conversion range. The multi-mode DC-DC converter comprises a Buck-Boost power conversion module, a driving module, a band gap reference module, an IC internal power supply module, a waveform generator module, a working mode selection module, a protection module, a voltage detection module, a current detection module, a soft starting module, a PWM controller module and an LDO controller module. The multi-mode DC-DC converter can realize total integration of a switching tube and a synchronous rectifying tube, and is externally connected with an inductor and an output filter capacitor; the input voltage range is 2.5 to 5.5 volts, the output voltage range of 2.5 to 5.5 volts is adjustable, the maximum output current is 1,000 milliamperes, the maximum working frequency is 1MHz, the precision of the output voltage is less than 5 percent, and a system enters an intermittent working mode during light load to realize the integral system efficiency of more than 80 percent; a control loop adopts double-loop control of voltage and current, realizes the control of a PWM mode and a PFM mode, and can realize LDO control in a specific voltage conversion range; and the over-temperature, over-voltage and over-current protection functions are realized.

An Electro-Mechanical Energy Conversion (EMEC) device and a method of electro-magnetically converting electrical energy to mechanical energy and electrical energy. The EMEC device comprises a stator; a rotor; a direct current power source; a commutator, and flourescent lamps acting as a non-linear, capacitive, voltage-limiting load. Four armature coils of a first magnetic polarity are concentrically mounted on a first side of the outer surface of a non-magnetic cylindrical stator casing, and four armature coils of an opposite polarity are concentrically mounted on an opposite side of the stator casing. Each coil is wound with an average of 6,650 turns of 34 AWG gauge teflon-coated wire. The rotor is constructed of non-magnetic material, and is rotationally mounted in the stator casing. A plurality of neodymium iron-boron permanent magnets are circumferentially mounted on the rotor. The magnets on a first side of the rotor are mounted with a first outward polarity, and the magnets on an opposite side of the rotor are mounted with an opposite outward polarity. The power source is connected to the coils and produces an output of 0-5,000 volts at 30 to 40 milliamperes maximum. The flourescent lamps are connected to the coils for rapidly dumping magnetic energy from the coils when the polarity is reversed. The commutator reverses the polarity of the first and second coils every 180 DEG of rotor rotation, and guides the magnetic energy from the coils to the load.

A system and device for using the power provided to street and area lights or other outdoor installations to power auxiliary devices which require a power supply which is different from line voltage for their power requirements. A device adapted to be connected to the NEMA three pole receptacle on a street or area light which converts the line voltage provided to the outdoor installation into a power form required by one or more auxiliary devices which cannot directly use the line current or voltage. The appropriate electrical connector for the auxiliary device may be included. Among the conversions: line voltage up to 480 volts alternating current converted to a user's specified voltage for WiFi, radios, surveillance cameras, traffic monitoring, other monitoring, security cameras, other communications, and UPS systems; DC voltage for the above applications and others; and power over ethernet conversion (for example, 48 volt direct current, 420 milliamperes).

The invention discloses a numerical-control direct-current power source. Reference voltage is provided by a D/A (digital to analog) module, and is outputted by a power operational amplifying module, the output is sampled and fed back to the input end of the power operational amplifying module for closed loop control, the outputted voltage can range from several millivolts to several dozens of volts, the current can range from several milliamperes to several amperes, the accuracy can reach 1 per mill, and the bidirectional voltage output and the bidirectional current output can be realized without an output polar reversing circuit. In addition, the numerical-control direct-current power source also has an overvoltage/overcurrent protection function and an outputted voltage and current measuring and displaying function.

The invention discloses a lithium iron phosphate precursor and a method for preparing a rechargeable battery electrode thereof. The method comprises the following steps: using a prepared active substance LiFePO4 precursor as a basic raw material, attaching the active substance to a conductive skeleton firmly by using intermolecular forces of the active substance precursor, and then pressing and sintering the active substance precursor to obtain the electrode. The method does not need adhesive to attach the active substance to the skeleton so as to simplify production technology; the electrode prepared by the method has the advantages of little internal resistance, high reaction speed and quick electrolyte absorption; and the method has the advantages of simple process, low energy consumption, low cost and better electric conductivity of the electrode. After the electrode prepared by the method is assembled into an actual battery with a cathode which is prepared by graphite, the internal resistance of the battery is less than or equal to 20 milliohms, the primary discharge capacity can reach 582 milliamperes, and the specific capacity can reach 102.1 milliamperes; and the discharge capacity still can reach 560 milliamperes after 50 times of cycle.

The invention discloses a device for welding an aluminum alloy plate. The device for welding the aluminum alloy plate comprises a left electromagnet core, a left electromagnet coil, a frame, a supporting plate, a right electromagnet core and a right electromagnet coil. A groove used for clamping a left aluminum plate is formed in the side face of the left electromagnet core and a groove used for clamping a right aluminum plate is formed in the side face of the right electromagnet core. The welding technology of the aluminum alloy plate welding device is characterized in that the manual argon tungsten-arc welding technology is adopted, after the left aluminum plate to be welded and the right aluminum plate to be welded are placed on the supporting plate and the two aluminum plates are clamped by the groove formed in the side face of the left electromagnet core and the groove formed in the side face of the right electromagnet core, energization is conducted and the aluminum plates are tightly pressed; before welding, chemical cleaning is conducted, and after the aluminum plates are washed through clean water, air drying is conducted; before welding, the aluminum plates are preheated, a formed groove is a Y-shaped groove, an HS311 welding stick is adopted, the welding current is 260 milliamperes-300 milliamperes, the argon flow is 10L/min-15L/min, and the hole diameter of a nozzle is 10mm-12mm. The device and technology for welding the aluminum alloy plate have the advantages that the device is simple in structure, the controllability is good, the welding effect is good, and the structural strength of the weldment is high.

Constant voltage or current is applied to high-voltage leads to determine impedance across medical device leads. Thyristors are used for upper switching components in an H-bridge. Current is sourced into a thyristor's gate from a ground-referenced source. This current then passes from the gate to the cathode and out to the patient. By keeping the current sufficiently low, the thyristors will not conduct from the anode to the cathode. Current passes through the thyristor, lead and patient and is sensed as it returns from the other lead. The sensed current is used to regulate the injected current. Pulses of constant current on the order of tens of milliamperes can be injected and the resulting voltage can be measured. Alternatively, a constant voltage can be applied and the resulting current can be measured to determine lead impedance.

The invention relates to a plasma generating device which can generate oxidant containing hydroxyl radicals and carry out oxidation treatment on gas liquid. The plasma generating device comprises a first electrode and a second electrode, wherein at least the first electrode is a metal sheet or a metal bar, the first electrode and the second electrode are connected by an insulation layer and isolated, and the wall thickness of the insulation layer is not more than 0.5mm; the first electrode is accessed into an alternating-current voltage, the second electrode is grounded, the alternating-current voltage applied between the first electrode and the second electrode is not less than 1KV, and the frequency is not less than 500Hz; and the plasma generating device works under the milliampere-class current consumption state. The plasma generating device can decompose and treat organic matters, treat toxic and harmful gases, eliminate peculiar smells of gases, decompose the organic matters in the air and treat to reach the emission standards, and has the advantages of low operation cost, relatively small device, low energy consumption and remarkable energy saving and environmental protection without adding any chemical medicines or other auxiliary treatment means during the use.

An automated shim power supply system and associated methods for calibrating the magnetic field in magnetic resonance imaging devices by precisely adjusting the currents in shim coils. An automated shim power supply system sets, monitors, and corrects programmable power supply outputs to ensure stable output currents to shim coils with milliampere precision. Accompanying methods include iteratively measuring primary field flux and setting shim coil currents to correct inhomogeneities to within OEM specifications.

A method and device are disclosed for using electrochemistry to rejuvenate skin and underlying tissue and to build and strengthen muscles by applying pulses of DC electrical charge, at a duration in the range of about 0.2 to about 1 millisecond and a variable frequency in the range of about 400 to about 1200 Hertz, to the skin immersed into an container of an electrolyte by means of an anode immersed in or connected to the container to cause the muscle to twitch or only slightly contract with each pulse. The DC is applied at variable current amplitude of from about 1 to about 50 milliamperes, and a voltage in the range of about 50 to about 120 volts.

The invention provides a highly dielectric material, comprising the following components in parts by weight: (a) 0.6-1 part of composite powder, (b) 58-79 parts of highly dielectric ceramic powder and (c) 20-41 parts of organic resin, wherein the composite powder is conductive-insulating composite powder, conductive-semiconductive composite powder or a combination of the conductive-insulating composite powder and the conductive-semiconductive composite powder. The dielectric constant of the highly dielectric material is greater than 100. At a proper operating voltage, the insulation resistance of the highly dielectric material is greater than 1 megohm, and the leakage current of the highly dielectric material is less than 50 milliampere. The highly dielectric material is quite suitable for being used as the dielectric material of an embedded type capacitive circuit board.

The invention relates to a combined type sensor, which belongs to the field of electric power measurements. The combined type sensor comprises a shell, and is characterized in that a V/I/v voltage sampling loop and an I/i current sampling loop are arranged on a measured high-voltage load conducting wire in the shell, and an output end of the V/I/v voltage sampling loop and an output end of the I/icurrent sampling loop are connected with a current interface and a voltage interface of an output interface of the shell respectively. The combined type sensor can acquire supplied weak current signals, supplies the signals to a measuring instrument of milliampere or microampere standard current signals and millivolts or microvolt standard voltage signals to perform measurement, can acquire the signals accurately, reduce the consumption, save the cost and prevent electric larceny, is save and stable, and is suitable for measuring the electric quantity of a high-voltage side.

The invention discloses a practical carbon dioxide reduction film electrolyzer and a preparation method thereof, and belongs to the field of electrocatalytic carbon dioxide reduction. The film electrolyzer comprises a cathode flow field plate, a cathode gasket, a cathode diffusion layer, a membrane electrode, an anode diffusion layer, an anode gasket and an anode flow field plate which are assembled in sequence, wherein the membrane electrode comprises an SPE membrane, a cathode catalyst and an anode catalyst, the cathode catalyst and the anode catalyst are located on the two sides of the SPEmembrane respectively, the cathode flow field plate is smooth in a snake shape, and the anode flow field plate is a net-shaped flow field. The method is simple and safe to operate, the electrolyzer works efficiently and stably, the performance of the electrolyzer reaches a high level in the same field, for example, hundreds of milliamperes of current density can be achieved through a low cell voltage, the selectivity exceeds 90%, and the like, and the electrolyzer has novelty, practicability and wide prospects.

An auto body CAN bus control system. The CAN bus technology substitute the digital serial communication protocol for traditional parallel wire control and possesses function of point-to-point, one point-to-multipoint and universal broadcasting transmission and achieves data resource sharing; The CAN reduces input demand for combined switch and other switch; current passing combined switch in traditional power supply system is supplied current for electricity consumer itself and amounts to several amp. to dozens of amp., while current is only several milliampere when changing to multi-path bus transmission system and accounts for one part per thousand of original current, thus reliability of parts is promoted; the electric appliances are generally connected by following strictly the SAEJ1939 communication protocol; the modularized, integrative and miniaturized structure facilitates batch production and spatial disposition; the new node can be directly hanged to bus when the CAN bus needed to be enlarged. It is subject to few cabling, enlarging and remodeling without developing and changing wiring harnesses, thereby simplifying production process and reducing production cost.

The invention discloses a method for preparing crystal TiO2 film with metal sputtering low temperature in the coating technical field, which comprises following steps: firstly, separately supplying argon gas and oxygen, respectively forming a local rich argon gas zone on the target material surface or a local rich oxygen zone near a substrate, secondly, sputtering titanium atoms of a metal titanium target in a metal sputtering mode, thirdly, folding induced type coupling radio frequency plasmas whose concentration grade is more than 10<11>cm-3 near the substrate, fourthly, ionizing or decomposing oxygen modules which are in the rich oxygen zone near the substrate in the induced type coupling radio frequency plasmas, generating oxygen ions and oxygen atoms, fifthly, enabling the oxygen ions and the oxygen atoms which are ionized or decomposed in the induced type coupling radio frequency plasmas to reach the substrate when in coating, taking part in reaction, and sixthly irradiating ion beams whose concentration is number milliampere/ square centimetre to the substrate when in coating. The method of the invention can prepare rutile type TiO2 film or ore titanium TiO2 film on a glass substrate with high speed and low temperature.