78 results about "Extra-low voltage" patented technology

An electron source include a first cathode electrode disposed over a substrate and terminated to provide electrons; an emitter layer disposed over the cathode electrode and formed from one or plurality vertically aligned and mono-dispersed nano-structures that are truncated to the same length, embedded in a solid matrix and protruding above the surface for emitting electrons; an insulator disposed over the emitter layer and having one or plurality of apertures, each is self-aligned with and exposes one nano-structure in the emitter layer; and a second gate electrode disposed over the insulator, having one or plurality of apertures self-aligned with the apertures in the insulator and terminated to extract electrons from the exposed nano-structures through the apertures. The gate aperture is substantially less than one micrometer and the gated nano-structures can have a density on the order of 108 / cm2. Such an electron source can be modulated with an extra low voltage, emits electrons with high current density and high uniformity, and operates with high energy-efficiency and long lifetime.

This invention relates to a photoelectromagnetic integrated advanced oxidation method and its device for waste water, which first of all acidizes the waste water, then strongly magnetizes it to generate energy of physical change and chemical change then enters into a photo-catalyzing box to be oxidated mostly to CO2 and water under the actioin of photo-catalyst, ultraviolet light, ozone and oxydol, in which, molecular chains of some hard-degradated substances are broken, then the waste water is micro-electrolysed to adsorb and recover the hard degraded substances under the action of extra low voltage, weak current and air, ozone and oxydol to get rid of COD, color degree, deodorizatin and disinfectant finall to filter it by diatomite and filter out suspending substances to reach the standard or recover it.

A ceiling fan comprising: a fan motor and blade assembly, a mounting tube for suspending the fan motor and blade assembly from a ceiling, and a power supply mounted within the mounting tube configured to power the fan motor. Also a ceiling fan comprising a moulded stator frame, a raised turret integrally moulded within the frame configured to enclose and mount a motor controller, and an external user changeable auxiliary module. Also ceiling fan comprising: a totally enclosed safety extra low voltage fan motor assembly configured to be suspended from an upper side, and a sealing arrangement within the assembly providing a substantial degree of ingress protection against dust and water incident from at least an under side. Also a method comprising providing a ceiling fan comprising moulded stator frame, and mounting an external user changeable auxiliary module to a raised turret integrally moulded within the frame.

A display device (500) is described with a plurality of pixels (555), each having a pixel state (P) that is driven by a driving voltage differential (VEP) between a pixel voltage (Vpx) applied to a pixel terminal (101) of the pixel and a common voltage (VCE) applied to a common terminal (102) of the pixel. In a first pixel driving state, wherein pixels are driven to a first colour, a common voltage is provided to the common terminals (102) with a first polarity. In a second pixel driving state, wherein pixels are driven to a second colour, a common voltage is provided to the common terminals (102) with a second polarity opposite to the first polarity. An absolute value of the common voltage (VCE) in the first and second pixel driving state is higher than a maximum absolute value of the column voltage (Vcol) in the corresponding pixel driving state.

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

A ceiling fan comprising: a fan motor and blade assembly, a mounting tube for suspending the fan motor and blade assembly from a ceiling, and a power supply mounted within the mounting tube configured to power the fan motor. Also a ceiling fan comprising a moulded stator frame, a raised turret integrally moulded within the frame configured to enclose and mount a motor controller, and an external user changeable auxiliary module. Also ceiling fan comprising: a totally enclosed safety extra low voltage fan motor assembly configured to be suspended from an upper side, and a sealing arrangement within the assembly providing a substantial degree of ingress protection against dust and water incident from at least an under side. Also a method comprising providing a ceiling fan comprising moulded stator frame, and mounting an external user changeable auxiliary module to a raised turret integrally moulded within the frame.

The invention discloses a charge pump circuit used for reducing current mismatch at an extra-low voltage in a phase-locked loop. The charge pump comprises a gate current mirror, a pull-up circuit, a pull-down circuit and an operational amplifier, wherein the gate current mirror consists of a first p-metal oxide semiconductor (PMOS) device, a second PMOS device and a first n-metal oxide semiconductor (NMOS) device; the pull-up circuit consists of a third PMOS device, a fourth PMOS device, a first switch and a second switch; the pull-down circuit consists of a second NMOS device, a third NMOS device, a third switch and a fourth switch; the fourth PMOS device realizes the functions of both a pull-up current tube and a pull-up switching tube; and the third NMOS device realizes the functions of both a pull-down current tube and a pull-down switching tube, so that the charge pump circuit realizes the parallel connection of the switching tubes and the current tubes and is suitable to work in an environment of low power supply voltage. A feedback loop formed by the operation amplifier increases the output impedance and reduces the mismatch of charging and discharging current.

A low-voltage sub-bandgap reference circuit is disclosed. In one embodiment, the low-voltage sub-bandgap voltage reference circuit includes a differential amplifier and a first bipolar transistor with its base and collector coupled to an electrical ground. The reference circuit further includes a second bipolar transistor with base and collector coupled to the electrical ground. The reference circuit further includes a DC bias circuit supplying a predetermined voltage output between a high and low voltage terminal, the high voltage terminal being coupled to both collectors of the first and second bipolar transistors and the low voltage terminal being coupled to both bases of the first and second bipolar transistors.

The invention provides a protection device of a power supply line disconnection fault, comprising a voltage-stabilizing circuit, a three-phase voltage sampling circuit, a three-phase voltage comparison circuit, a signal superimposed circuit and a split-phase pulse output circuit, wherein the output end of the three-phase voltage sampling circuit is connected with the three-phase voltage comparisoncircuit; and the output end of the three-phase voltage comparison circuit is connected with the split-phase pulse output circuit through the signal superimposed circuit. The protection device of thepower supply line disconnection fault is characterized in that a three-phase voltage-stabilizing circuit is used as the voltage-stabilizing circuit and is additionally provided with a grounding current control circuit, a blanking pulse circuit and a protection circuit, wherein the input end of the grounding current control circuit is connected with the split-phase pulse output circuit, and the output end of the same sequentially generates three-phase grounding current on the ground; and the blanking pulse circuit and the protection circuit are both connected with the grounding current controlcircuit. The invention utilizes the residual current of the front end of the grounding current control circuit to detect the tripping operation protection of the protection device after the power supply line disconnection fault is detected, and enables a system to have very simple structure and reliable property and provide protection for faults, i.e. zero line disconnection, phase line disconnection, extra-high voltage, extra-low voltage, and the like.

The invention discloses an illuminating device and a process for producing the same, in particular a high-power LED lamp and a production process thereof. The high-power LED lamp comprises a packaging optical system, a radiating system and a drive system, and is characterized in that the radiating system adopts a lamp body surface cross-ventilation natural heat dissipation mode; the drive system is an extra-low voltage constant pressure power supply system; and a lamp is separated from a power adapter; the production process of the high-power LED lamp comprises a packaging process of the lamp, production processes of the lamp and a light source, and a technological process of producing the lamp, and is characterized in that the packaging process comprises the following steps of cleaning, press welding and packaging; and the technological process of production comprises the following steps of plate setting, welding and closing up, hydraulic straightening system, galvanization, spraying, lifter installing, moulding bracket mounting and assembling. The high-power LED lamp and the production process thereof have the advantages of energy conservation, consumption reduction, high efficiency and safety.

The invention relates to an air-cooled frequency converter, especially for construction site equipment, such as internal and external vibrators which are operated at a higher frequency than the existing electricity supply, said frequency converter comprising a housing and preferably being connected to a separation transformer for producing a protective extra-low voltage. Said housing is divided into two sections, that is into a converter receiving element surrounding a plate chamber, and a housing section connected to said receiving element and used as a cooling region, inside which cooling air channels and a fan for conveying the cooling air through the cooling air channels are arranged. The configuration of the housing in the cooling region and optionally the embodiment of a transformer chamber are created by annular profiled elements which are cross-cut as desired, surround each other in an interspaced manner, and are coaxially arranged in relation to each other.

A multi-services access platform is presented for supporting metallic test access in switching or multiplexing devices such as digital subscriber line access multiplexers (DSLAMs). The multi-services access platform includes a chassis within which a predetermined number of card slots are included. Each of the card slots includes a number of input / output ports. A backplane runs along the chassis and includes a metallic test access bus. The metallic test access bus is operable to selectively couple to one or more input / output ports within the line card slots of the chassis to establish one or more metallic test paths. A relay matrix may be used to provide the selective coupling for the metallic test access bus, and the flexibility provided by the configuration of the relay matrix supporting the metallic test access bus allows for a variety of different test access ports (TAPs) to be supported. Specific TAP configurations may be configured that support both a Safety Extra Low Voltage (SELV) rated stimulus and a Telecom Network Voltage (TNV) rated stimulus such that local loops that support a variety of different signaling protocols can be tested using the metallic test access bus either individually or concurrently.

The high voltage inverter device receives, as an input voltage, a DC voltage or a voltage within Safety Extra Low Voltage composed of a DC component with a pulsating flow superposed thereon. The input voltage is switched by a switching element to pass an exciting current to excitation windings on a primary side of a plurality of separate transformers having same characteristics to simultaneously excite the excitation windings. Output windings of the plurality of transformers are connected in parallel or in series with one another, and time axes of waveforms of output voltages of the output windings are synchronized. Thereby, a high-power high voltage is outputted continuously, stably, and safely from both ends of the output windings connected in parallel or in series.

The embodiment of the invention relates to a transformer, a product and a driving device of the product, wherein the product comprises the transformer and has (safety extra-low voltage) SELV requirements. The transformer comprises a magnetic core, a framework, at least one winding and an insulation isolation unit, wherein the winding is wound on the framework, the insulation isolation unit is coupled with the framework and is configured into the state that the winding and other conducting components outside the transformer at least meet the preset electric isolation standard. The compactness of the whole circuit comprising the transformer is realized, the equipment size is reduced, and in addition, the production cost is reduced. The embodiment of the invention also relates to a method for manufacturing the transformer.

The invention discloses a charge pump circuit working at extra low voltage, comprising a common-source common-body body drive current mirror, a first operational amplifier and a second operational amplifier, wherein the common-source common-body body drive current mirror consists of a first N-type MOS tube, a second N-type MOS tube, a third N-type MOS tube, a fourth N-type MOS tube, a first P-type MOS tube, a second P-type MOS tube, a third P-type MOS tube and a fourth P-type MOS tube, the second N-type MOS tube and the fourth N-type MOS tube not only realize the function of pulling down current tubes, but also realizes the function of pulling down the MOS tubes; the second P-type MOS tube and the fourth P-type MOS tube not only realize the function of pulling up the current tubes, but also realizes the function of pulling up the MOS tubes, thereby realizing the parallel connection relation of an MOS switch function and a current mirror function. The goal of increasing gains is achieved through the two operational amplifiers, i.e. the output resistance of the common-source common-body current mirror can be increased under low supply voltage.

The invention discloses a preparation method of a rubber material for preparing a temperature-resisting and ozone-resisting automobile oil tank gasket. The preparation method comprises the following steps of: (1) supplying water to cool an internal mixer, putting a rubber raw material, a reinforcing filler, a plasticizer, an activating agent, an anti-aging agent and an accelerating agent into the internal mixer, internally mixing, controlling the temperature of rubber to be lower than 130 DEG C for rubber discharging, discharging sheets on an open type rubber mixing machine, and cooling to obtain master batch; and (2) putting the master batch into the internal mixer, uniformly adding a vulcanizing agent, mixing, controlling the temperature of the rubber to be lower than 100 DEG C for rubber discharging, discharging the sheets on the open type rubber mixing machine, cooling, standing, and curing to obtain a temperature-resisting and ozone-resisting rubber material which is used for manufacturing the automobile oil tank gasket and other rubber products. Compared with the prior art, the preparation method has the advantages that the prepared automobile oil tank gasket and other rubber products meet the standards of American Society for Testing Material (ASTM) D2240, ASTM D412, ASTM D573 and ASTM D1171, meet the requirement of an extra low voltage (ELV) instruction and achieve the effects of temperature resistance and ozone resistance through the detection of various mechanical strength indexes and physical and chemical indexes by using the prepared temperature-resisting and ozone-resisting rubber material.

The line has a low voltage power supply unit (10) supplying average power to a power supply (80) which supplies a storage unit (60) that stores energy. The power supply uses the energy for supplying a traction chain (70) during starting phase or during ascending grade. One of two supply rails is electrically joined with one of two running rails, while the other supply rail is electrically distinct from the running rails. - The power supply uses the electrical energy stored during one of running phase, braking phase where electrical energy is recovered from the traction chain, or stop phase of the storing unit, for supplying the traction chain.

The invention provides a preparation method of rubber material for preparing a high temperature-resistant automobile cooling hose, which comprises the following steps of: (1) cooling an internal mixer with water, putting rubber raw material, reinforcing filler, plasticizer, active agent, anti-aging agent and accelerator into the internal mixer for banburying, discharging rubber when the temperature of the rubber is controlled to be less than 160 DEG C, and discharging sheets and cooling on an open type rubber mixing machine, to obtain master batch; and (2) putting the master batch into the internal mixer, evenly adding vulcanizer for mixing, discharging the rubber when the temperature of the rubber is controlled to be less than 100 DEG C, and discharging sheets, cooling and curing in a sewing way on the open type rubber mixing machine, to obtain the high temperature-resistant rubber material for manufacturing the rubber products such as the automobile cooling liquid system tube; and compared with the prior art, the preparation method can prepare the high temperature-resistant rubber material, due to the detection of various mechanical strength and physical and chemical indexes, the manufactured rubber products such as the automatable cooling liquid system tube can accord with the standards of the ASTM (American society for testing material) D2240, the ASTM D412 and the ASTM D573, and meet the ELV (extra low voltage) instruction requirement; and therefore, the high temperature resistance can be improved.

A system and method for providing a protective extra low voltage power supply in an elevator system (2) is disclosed. The power supply system (10) may include a switch mode power supply (12) configured to provide an output voltage, a first voltage monitor (18) and a second voltage monitor (20). Each of the first voltage monitor (18) and the second voltage monitor (20) may be configured to receive the output voltage and determine an over-voltage condition at the switch mode power supply (12).

A ceiling fan comprising: a fan motor and blade assembly, a mounting tube for suspending the fan motor and blade assembly from a ceiling, and a power supply mounted within the mounting tube configured to power the fan motor. Also a ceiling fan comprising a moulded stator frame, a raised turret integrally moulded within the frame configured to enclose and mount a motor controller, and an external user changeable auxiliary module. Also ceiling fan comprising: a totally enclosed safety extra low voltage fan motor assembly configured to be suspended from an upper side, and a scaling arrangement within the assembly providing a substantial degree of ingress protection against dust and water incident from at least an under side. Also a method comprising providing a ceiling fan comprising moulded stator frame, and mounting an external user changeable auxiliary module to a raised turret integrally moulded within the frame.

The invention provides a current collecting device on a power transmission line, and belongs to the technical field of power equipment. The current collecting device solves the technical problem that in the prior art, an extra power supply is needed for power supply. The current collecting device comprises a power taking mutual inductance coil, a sampling mutual inductance coil, an analog-digital conversion circuit, an internal memory, a single chip microcomputer, a wireless signal transmitting module and a power supply arranging unit, wherein the power taking mutual inductance coil and the sampling mutual inductance coil are mutually independent, a secondary output winding on the power taking mutual inductance coil is in electric connection with the power supply arranging unit, and the power supply arranging unit can carry out rectification, voltage stabilization and over-voltage protection on currents output by the secondary output winding. The current collecting device has the function of directly obtaining induction currents from the power transmission line and an extra low-voltage direct-current power supply is omitted; the magnitude of voltage on the power transmission line cannot influence operation of the collecting device, and the function of being free of being influenced by the magnitude of the voltage is achieved.

The invention discloses a module energy store converter system (10) comprising the following: at least one converter arm (12) comprising a plurality of standard modules (14) connected in series, and at least one extra-low voltage module (ELV module) (40), wherein the standard modules (14) and the ELV module can be connected such that inputs (48) of a transducer (46) of the ELV module can be optionally connected to the storage element (26) of an adjacent standard module (14) serially and / or anti-serially, or the transducer (46) can be decoupled from the storage element (26), and / or the inputs (48) of the transducer (46) can be optionally connected to the storage element of an adjacent standard module (14) in parallel, or the transducer (46) can be decoupled from the storage element (26).

An integrated circuit die includes a plurality of transistors formed in a semiconductor substrate, the body regions of the transistors on a doped well region of the semiconductor substrate. A threshold detector selectively applies either a first voltage or second voltage to the doped well region based on whether the temperature of the semiconductor substrate is above or below a threshold temperature.

The invention discloses a rectifier which at least comprises a single-stage rectification circuit, wherein the single-stage rectification circuit comprises a first flying capacitor, a second flying capacitor, a first NMOS transistor, a second NMOS transistor, a first PMOS transistor, a second PMOS transistor and an output capacitor, wherein a substrate and a source electrode of the first NMOS transistor are electrically connected to a second output end of a pre-stage circuit and are insulated from a first output end of the pre-stage circuit, a substrate and a source electrode of the second NMOS transistor are electrically connected to a first output end of a pre-stage circuit and are insulated from a second output end of the pre-stage circuit, a second end of the first flying capacitor is electrically connected with a positive end of a signal source, and a second end of the second flying capacitor is electrically connected to a negative end of the signal source; a substrate and a source electrode of the first PMOS transistor and a substrate and a source electrode of the second PMOS transistor are electrically connected and serve as an output end of the single-stage rectification circuit. According to the rectifier, minimum input voltage is lowered, and power conversion efficiency of the rectifier is improved when ultra-low voltage is input.

The present invention provides a method for testing parameter of super-low voltage three-phase alternating-current induction motor and a device thereof. A DC-AC inversing system is adopted for driving the electric motor. An ECU controller adopts a VVVF control algorithm and realizes the speed modulation to the motor with a mode of constant pressure-frequency ratio. A data processing module executes storing and display procession to the motor-end voltage and phase current obtained through real-time sampling. The input power of motor is calculated through FFT. An accumulator provides a power source. The parameter measuring is executed through executing experiments of empty loading, rotation-clogging, voltage-frequency characteristic, etc. to the three-phase alternating-current induction motor. The invention also provides a method for measuring the motor parameter, testing the electric property and identifying the quality of magnetic material. The device according to the invention comprises a hardware platform which is composed of a DC-AC inverter, an inversion driver, an ECU controller, a measuring module, a data processing module and a touch screen. The device according to the invention has the advantages of simple structure and reliable performance.

The invention discloses an extra-low voltage continuous time auto-zero nava power consumption transconductance amplifier. The extra-low voltage continuous time auto-zero nava power consumption transconductance amplifier comprises a main amplifier which comprises the main amplifier comprises an input differential pair, a feedback differential pair, a cross coupling transconductance enhancement structure and a Cascode resistance level; an auxiliary amplifier which comprises an input differential pair, a feedback differential pair and a Cascode resistance level and is used for suppressing the imbalance of the main amplifier after eliminating the self imbalance; and a sampling capacitor and a low voltage switch, wherein the sampling capacitor and the low voltage switch are used for sampling and compensating the imbalance of the auxiliary amplifier. The amplifier solves the problems of the imbalance of the extra-low voltage nava power consumption amplifier and l / f noise; the work voltage of the amplifier can be as low as 0.5V, and the power consumption can be as low as below 100 nW. According to the invention, the amplifier has broad application foregrounds in the fields of biological chips, medical electronics and internet of things, etc.

The invention relates to a photovoltaic (pv) grid-connection inverter low-voltage ride-through auxiliary power supply device and a method, and the device includes an alternative current electricity-taking circuit, a direct current electricity-taking circuit and a delay deenergizing circuit. Aiming at the defect that the electricity-taking time of the direct current bus is very short, the part of the circuit is in a way of simulating power supply, the circuit structure is simple, and the cost is reduced. Meanwhile, the active close of an auxiliary source is in a way of delay closing, and a comparator and a digital controller are unnecessary to participate in the process, so that no extra low-voltage auxiliary power supply is necessary; the photovoltaic (pv) grid-connection inverter low-voltage ride-through auxiliary power supply device is simple in structure, precision in timing and high in reliability, guarantees reliable work of the ride-through function of the low-voltage inverter, and further reduces the product cost.

The invention discloses an ultra-low voltage self-starting control circuit for a DC-DC converter. The ultra-low voltage self-starting control circuit comprises a first signal input end, a second signal input end, a self-starting circuit, a mode control circuit, a reference circuit, a PFM control loop and a main power switch, wherein the first signal input end is connected with an input end of theself-starting circuit and one end of the main power switch; the other end of the main power switch is connected with an input end of the PFM control loop, an output end of the PFM control loop is connected with a control end of the main power switch, the self-starting circuit is connected with the mode control circuit, an output end of the mode control circuit is connected with a control end of the PFM control loop, and an output end of the self-starting circuit is connected with an input end of the PFM control loop and the reference circuit. The ultra-low voltage self-starting control circuitcan achieve stable output and is low in cost.

An earthing of an electronic circuit is disclosed in a device belonging to a low-voltage system with, for example, a maximum AC voltage of 1000 V or a maximum DC voltage of 1500 V in which the device is at the main voltage potential or is connected to the main voltage through a high-impedance coupling. An overvoltage protection of the interface between such an electronic circuit and a SELV (Safety Extra Low Voltage) circuit is also disclosed. The neutral point (COM) of the electronic device is coupled to protective earth (PE) through at least one breakdown-based overvoltage protector. The rated breakdown voltage of the overvoltage protector is higher than the voltage present across it in normal operating conditions but lower than the minimum dielectric strength of the component forming the interface between the electronic device and the SELV circuit.