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.

This invention pertains to electrochemical cells, typically to air depolarized cells of the button-type. Non-reactive elements of cells of the invention are thinner than corresponding non-reactive elements of prior art cells. Such elements can be made thinner because of improved structures of such elements. The anode can is made from a metal strip structure having a higher steel content. The cathode can preferably has improved stiffness and rigidity while retaining sufficient ductility to tolerate forming the cathode can. By so reducing the thicknesses of non-reactive elements of the cell, and thus the volume occupied by such non-reactive elements, the fraction of the cell devoted to holding electrochemically reactive anode material therein is increased, with corresponding increase in the milliampere hour capacity of the cell.

The present invention provides an esthetic device, useful for increasing skin beautification at a region of a patient's skin, comprising: a. electrical output device for repeatedly generating at least two electrical waveform simultaneously, each of said electrical waveform is comprised of a combination of multiple types of waveforms; and b. two electrodes electrically coupled to said electrical output device, placed on said skin region and apply said at least two electrical waveform on said skin portion. The two electrical signal applied to said region are essentially dissimilar, ultra-strong, at a frequency range of 0 Hz to 20 Hz, having an amplitude of about 4 to about 20 Volts, electrical current higher that 500 and lower than 2.5 milliampere and power output of about 24 milli-Watts.

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).

A system includes a power source, a power converter, a leakage current cancelation circuit, a load, and a ground node. The power converter is coupled to the power source and supplies the load. During operation of the power converter, a common mode current flows from the load to the ground node via a leakage capacitance. The leakage current cancelation circuit receives at least one signal indicative of the common mode current and generates a leakage cancelation current that is injected into at least one node of the system. The leakage cancelation current has a magnitude opposite a magnitude of the common mode current. For example, the leakage current cancelation circuit receives supply voltage signals output by the power converter, and generates and supplies the leakage cancelation current onto input nodes of the power converter such that a current level on the ground node is between −3.0 milliamperes and +3.0 milliamperes.

The invention discloses a cooperative detection ion mobility spectrometer of the positive ion and negative ion of a plasma source; the plasma source has a positive metal electrode and a negative metal electrode, and voltage is imposed between the two electrodes so as to generate the plasma; the electrode is of the shape of a needle, rod, plate, cylinder or net, the discharging voltage is hundreds to thousands and the current is microampere to milliampere; the signal intensity of the ion source is large, the positive ion works cooperatively with the negative ion, therefore, the detection sensitivity is good, the resolution is high, the measurement speed is fast, the meter has small volume and simple operation and is applicable to fast online detection and alarming of trace amount of explosive, drugs and organic matters; compared with the radioactive source of the traditional ion mobility spectrometer, the plasma source has the advantage of no radioactivity, the spectrometer is convenient in use, maintenance and management and has high detection sensitivity and detection accuracy.

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.

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.

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 liquid level apparatus ultra-low power consumption processing circuit and an energy saving detection method thereof. The liquid level apparatus ultra-low power consumption processing circuit comprises a microprocessor, a single chip microcomputer, a communication module, a liquid level sensor module, a storage module, a 12V battery, a first power-switching module, a SIM card seat, a 3V lithium battery and a second power-switching module, wherein the single chip microcomputer is used for timekeeping, regularly opening and closing a power supply; and the communication module is used for communicating with the superior management center and transmitting information; the liquid level sensor module is used for measuring the depth of the liquid level and quantifying; the storage module is used for storing the liquid level information, IP address and other key information; and the power-switching modules high-efficiently produce two different voltages. According to the energy saving detection method, compared with the traditional liquid level apparatus, the working electric current consumption is at the level of microampere, compared with several milliamperes consumption of the traditional liquid level apparatus, the consumption reduces by above two orders of magnitudes, and the energy saving detection method has the advantage of low cost.

A system includes a power source, a power converter, a leakage current cancelation circuit, a load, and a ground node. The power converter is coupled to the power source and supplies the load. During operation of the power converter, a common mode current flows from the load to the ground node via a leakage capacitance. The leakage current cancelation circuit receives at least one signal indicative of the common mode current and generates a leakage cancelation current that is injected into at least one node of the system. The leakage cancelation current has a magnitude opposite a magnitude of the common mode current. For example, the leakage current cancelation circuit receives supply voltage signals output by the power converter, and generates and supplies the leakage cancelation current onto input nodes of the power converter such that a current level on the ground node is between −3.0 milliamperes and +3.0 milliamperes.

The invention discloses a sensor fault detection device and relates to the technical field of sensor fault diagnosis. The sensor fault detection device comprises a power supply module, wherein one end of the power supply module is connected with 220V alternating current, and the alternating current is converted into direct current through the power supply module to be respectively supplied for a frequency display module, a milliampere current display module and a working voltage / working current display module; the frequency display module is connected with a frequency signal input module; the milliampere current display module is connected with a current signal input module; the working voltage / working current display module is connected with a power supply output module and an alarm. The sensor fault detection device has the advantage that on the premise of not changing a traditional mine sensor fault maintenance mode, and various commonly-used instruments, tools and tooling are integrated, so that convenience in maintaining a portable instrument is realized.

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.

The invention discloses a current-limiting protection circuit of a power transistor. The current-limiting protection circuit comprises a current sampling module, a threshold adjusting module and a clamping module. The threshold value adjusting module is used for providing a reference current representing a current limiting threshold value, and the clamping module is used for feeding back and controlling the grid voltage of the power transistor under the condition that the sampling current is greater than the reference current so as to clamp the load current of the power transistor to the current limiting threshold value, the threshold value adjusting module is further used for controlling the reference current to increase progressively along with time when the power transistor is in an intermediate state between a turn-off state and a turn-on state, so that normal starting of the circuit is prevented from being affected by misoperation of the current-limiting protection circuit in the starting process of the circuit, and normal starting of the circuit can be guaranteed in the starting stage of the power transistor. Therefore, the load current is gradually changed from dozens of milliamperes to several amperes, the soft start of the power transistor is realized, and the power transistor and a post-stage load are protected.

The invention discloses a test bench for X-ray detection apparatuses. The test bench is characterized in that a start-up circuit with a DC voltage is connected to earthing pins and milliampere (mA) output pins of a controller output port and a handpiece output port, a high-voltage packet test circuit with an adjustable output voltage is connected with two high-voltage packet voltage output pins of the handpiece output port, two high-voltage packet voltage supply output pins of the controller output port are connected with a waveform display instrument, the two high-voltage packet voltage output pins and pseudo loads of the handpiece output port are respectively connected in series with a normally open contact of an AC relay and then connected in parallel with the waveform display instrument, a control circuit for switching the mutually-exclusive access of the two high-voltage packet voltage output pins and the pseudo loads as well as adjustable alternating voltage loads is composed ofthree AC relays and three sets of button switches; and a X-ray machine technical parameter and waveform display device is composed of a voltmeter, an ammeter and a waveform display instrument. By using the test bench for X-ray detection apparatuses disclosed by the invention, the performance parameters, working conditions and failure positions of a controller of an X-ray machine, a handpiece and a handpiece high-voltage packet can be diagnosed through onekey operation, therefore, the test bench disclosed by the invention can be widely used in the performance test and fault diagnosis and maintenance of the X-ray machine.

The invention discloses an electromagnetic-friction nano water flow power generation device which comprises a casing, a rotor, a stator, a permanent magnet, a coil, a rotating shaft, a turbine and anexternal circuit. An electromagnetic power generator is formed by the casing, the coil, the permanent magnet and the rotating shaft. Two ends of the casing are equipped with two friction nanogenerators which comprise stators, rotors, Teflon films and copper electrode films, and the surfaces of the copper electrode films and the Teflon films are in contact with each other. Since the friction nano power generation technology is employed in the invention, a voltage of about 200V can be generated at a rotation speed of 10r / min, the output voltage of electromagnetic power generation is gained, andthe current outputted after the combination of the two can reach a milliampere level, which is sufficient for powering most sensor components. Since the friction nanogenerators and the electromagneticpower generator of the invention are connected through the same rotating shaft, the same angular velocity is ensured, and therefore, the output currents of the two power generation modes are in the same phase.

The invention discloses a current loop isolation, transmission and integration module. A digital power supply, an analog power supply, a micro-programmed control unit (MCU) and an external printed circuit board (PBC) are connected on the outer side of the current loop isolation, transmission and integration module which is used for outputting current analog signals of 0 to 20 milliamperes and 4 to 20 milliamperes after two channels of digital signals are transformed. The current loop isolation, transmission and integration module comprises a digital to analog converter (DAC), a double channel signal conditioning circuit, a double channel voltage-current conversion circuit, a digital isolator, a digital power interface, an analog power interface, two current loop output interfaces and a serial peripheral interface (SPI) bus interface. According to the current loop isolation, transmission and integration module, the digital to analog converter (DAC), the double channel signal conditioning circuit, the double channel voltage-current switching circuit and the digital isolator are packed in a mini-type package module, so that influences caused by whole circuit layout and wiring on the current loop isolation, transmission and integration module are effectively avoided, and the area of the PBC are effectively saved.