95results about How to "Eliminate power loss" patented technology

A portable computer having a biometric authentication device is disclosed. The portable computer also includes a processor, a power supply unit having a first power system and a second power system, a power control circuit for controlling the power supply unit, and a start-up button for generating a startup signal for starting the portable computer. The biometric authentication device sends a power request signal to the power control circuit to activate the second power system upon a detection of a human user in a state where the second power system is deactivated and electric power is being supplied by the first power system. The biometric authentication device can perform an authentication operation while receiving electric power from the second power system, and the power control circuit causes the portable computer to transition to a power-on state in response to an authentication success by the biometric authentication device.

A switching-mode power supply capable of causing conduction through a synchronous rectifier switch exactly when required. Included is a transformer having a primary winding connected to a pair of DC input terminals via an active switch, and a secondary winding connected to a pair of DC output terminals via a synchronous rectifier and a smoothing capacitor. The synchronous rectifier is a parallel connection of a synchronous rectifier switch and a diode. In order to cause conduction through the synchronous rectifier switch while the diode is conducting, there is provided a synchronous rectifier control circuit comprising two current sources, a conduction period determination circuit, and a synchronous rectifier switch control pulse forming circuit.

The invention belongs to the technical field of power sources and relates to a self-adaptation voltage regulator circuit. The self-adaptation voltage regulator circuit comprises a power tube MP, a power tube MN, an inductor L, a capacitor C, a first resistor RF1, a second resistor RF2, a simulation phase lead compensation module, a delay phase lag compensation module, a critical path duplication module, a sawtooth wave generating module, a comparator and a power tube driver. The output voltage Vout is partitioned by the first resistor RF1 and the second resistor RF2. Simulation phase lead compensation is achieved through an operational amplifier, the resistor R1, the resistor R2 and the capacitor C. A load of an operational transconductance amplifier GM is RGM1 and provides the loop gain of APD compensation. The delay of the duplication of the critical path is compared with a system clock CLK through phase detection. Then, delay error signals are integrated through a charge pump. The output voltage VPD of the charge pump is connected to the positive going input end of the operational transconductance amplifier GM. PWM waveforms can be obtained by comparing the sawtooth wave current generated by an oscillator OSC and the output current of the GM. By means of the self-adaptation voltage regulator circuit, the power loss of a digital circuit is greatly reduced.

The main cable and the drive cable each incorporates a positive power line, a negative power line, a positive signal line and a negative signal line. The main cable is connected to the USB ort of the host apparatus with the connector, and the drive cable is connected to the USB ort of the USB drive device with the connector. In the connector module, the diode is inserted into the positive power line of the auxiliary cable, and the cathode side thereof is connected to the positive power line side of the mutually connected main cable and drive cable.

A switching-mode power supply capable of causing conduction through a synchronous rectifier switch exactly when required. Included is a transformer having a primary winding connected to a pair of DC input terminals via an active switch, and a secondary winding connected to a pair of DC output terminals via a synchronous rectifier and a smoothing capacitor. The synchronous rectifier is a parallel connection of a synchronous rectifier switch and a diode. In order to cause conduction through the synchronous rectifier switch while the diode is conducting, there is provided a synchronous rectifier control circuit comprising two current sources, a conduction period determination circuit, and a synchronous rectifier switch control pulse forming circuit.

A fuel-impermeable membrane for a fuel cell including a nano-film proton exchange membrane (PEM) having an energy loss of less than about 100 mA cm−2 of active surface area, and the energy efficient fuel cell formed therewith, and methods of making same.

An optical system comprises an optical fiber with gain producing core with an index of refraction n1, surrounded by at least one cladding with an index of refraction n2, said cladding including at least one index reduced area with an index of refraction n2, such that n1>n2>n2, the core propagating signal at a spatial fundamental mode at a signal wavelength λ1 and at a power level sufficient to generate optical power at a wavelength λ2, where λ2>λ1, and the optical fiber has at least one cut-off fundamental spatial mode wavelength λC, and λ1<λC and λ2>λC.

The present invention discloses a transmit-receive (TR) front end. The TR front end includes a low-noise amplifier (LNA); a power amplifier (PA); a transformer, coupled to the PA, for increasing a voltage swing and a power transmission of the PA; and a TR switch, coupled between the transformer and the LNA. The LNA is single ended and there is no transformer between the LNA and the TR switch.

The invention discloses a current sampling circuit of a metal oxide semiconductor field effect transistor (MOSFET) switch element. A first end of the switch element is connected with a first input end of a sampling module and serves as a current input signal end, a second end of the switch element is connected with a second input end of the sampling module and serves as a current output signal end of the MOSFET switch element, and an output end of the sampling module serves as a sampling current output signal end. The sampling module directly samples voltage difference of the first end and the second end of the MOSFET switch element. Maximum voltage difference value allowed between the first input end and the second input end of the sampling module is a withstand voltage value between two input ends of the sampling module. A clamping module included in the sampling module increases the withstand voltage value of the sampling module so that a current path formed between the first input end and the second input end of the sampling module is blocked, and working voltage range of the current sampling circuit of the MOSFET switch element is improved.

Methods and circuits for providing a minimum driving voltage to a current-driven load (such as a laser diode) are disclosed. The circuit and methods may be useful for efficiently providing a bias and / or driving current to the current-driven load with minimal energy loss. The circuit generally comprises (1) a driver or voltage source configured to provide the bias and / or driving current to the current-driven load, (2) a sense circuit configured to (i) sense the bias and / or driving current and (ii) convert the bias and / or driving current to a first voltage, and (3) a comparator configured to (i) receive the first voltage and first and second reference voltages and (ii) provide a feedback / error signal to the driver or voltage source, the feedback / error signal configured to maintain or adjust the bias and / or driving current at or towards a target value.

The invention belongs to the technical field of wind power generation system control, and discloses a twisting vibration control method and device of a wind generating set transmission chain. The twisting vibration control method comprises the following steps that step1, a rotation speed omega G of a high-speed shaft of the wind generating set transmission chain and a rotation speed omega W of a low-speed shaft of the wind generating set transmission chain are detected and obtained at the same time; step2, difference calculation is carried out to get a result that omega e=( omega G -Nomega W), wherein N is the transmission ratio of a gear box; step3, the difference omega e is subjected to lowpass filtering to filter detected high-order noises, so that omega e' is obtained, delta 1 is made to be equal to p omega e', and p is an error feedback gain; step4, a generator electromagnetic torque instruction value TG1 is calculated to be equal to TG+ delta 1 omega G, and a torque controller controls the generator to output the electromagnetic torque instruction value TG1. According to the twisting vibration control method and device, damping self-adapting adjustment control is achieved, and moreover power loss caused by changes of damping is eliminated when the wind generating set is in a stable state.

The invention discloses a maximum power point tracking system and a method for a photovoltaic power generation system. The system comprises an internal resistance sensor, wherein the internal resistance sensor provides alternating current signals into a direct current main loop of the photovoltaic power generation system and can simultaneously obtain and compare the alternating current response signals with the same frequency as the alternating current on the equivalent output impedance of a solar panel and the equivalent input impedance of a maximum power point tracking (MPPT) controller, a comparison result is obtained, and the output pulse duty ratio of the MPPT controller is regulated until the comparison result is zero. Through the full circuit ohm law, when the impedance value of the equivalent load is the same as the internal resistance of a power supply, the power supply output power obtained by an equivalent load is maximum, and the maximum power point is reached. The method can be used for detecting the maximum power point of the system in real time, in addition, the change of the maximum power point is accurately and fast tracked, so the power consumption caused by oscillation regulation of the output voltage value and the current value of the solar panel and the searching of the changed maximum power point is eliminated, and the output efficiency of the photovoltaic power generation system is improved.

A method of eliminating vampire energy loss in battery charges is provided. Vampire energy loss occurs when an electronic or mechanical machine consumes energy while not being utilized for the purpose of its existence, for example, energy loss in re-charging consumer electronic devices. By employing the use of an electromechanical switching method that creates a conductive short circuit to the charger after disconnecting the charged target device, the vampire or no load energy loss can be eliminated with or without disconnecting the charger.

An optical system comprises an optical fiber with gain producing core with an index of refraction n1, surrounded by at least one cladding with an index of refraction n2, said cladding including at least one index reduced area with an index of refraction n2, such that n1>n2>n2, the core propagating a signal at a spatial fundamental mode at a signal wavelength λ1 and at a power level sufficient to generate optical power at a wavelength λ2, where λ2>λ1, and the at least one index reduced area in combination with the core provide has at least one cut-off fundamental spatial mode wavelength λC, and λ1<λC and λ2>λC.

The present invention discloses methods and apparatus for constructing optical switch systems, in which any input optical signals can be routed to any output ports. The methods and apparatus provide advantages of configuration flexibility, modular construction, constant signal loss, and minimal numbers of switch units required. The switch systems comprise M×N switch modules. The switch module in turn comprises a two-dimensional waveguide array and a number of waveguide grating-based wavelength selective switches. With the capability of wavelength-selective routing provided by the switch modules, the optical switch systems requires a relatively small amount of switch units to extend into a very-large-scale switch system.

The invention discloses a double-period conversion circuit for energy acquisition. The double-period conversion circuit comprises two stages, wherein the first stage is a negative pressure converter, the second stage is an active diode, the negative pressure converter is used for converting negative amplitude of an AC signal of a sensor to positive amplitude, a P-channel metal oxide semiconductor (PMOS) adopts a substrate bias design and is used for reducing the conduction resistance, and the active diode adopts a common-gate comparator structure and is used for reducing a power supply voltage of a system on the basis of ensuring the gain and bandwidth. The double-period conversion circuit aims to reduce the number of comparators, reduce the working voltage and the power consumption of the overall circuit and improve the voltage conversion efficiency and the energy conversion efficiency, and the requirements of a micro energy acquisition system for low voltage and low power consumption are met. By reducing the working voltages of the comparators, the overall working voltage is reduced, so that the circuit is applicable to the energy acquisition system; by the adoption of the two-stage rectification structure, the number of the comparators is reduced, the overall power consumption is reduced, and the energy conversion efficiency is improved; and the energy loss in open-circuit time is reduced through double-period control.

This invention pertains to a motor vehicle having a standard drive train including an engine, a torque converter and a transmission, in which the hydraulic fluid required for proper operation of the torque converter and transmission is supplied by an externally mounted, electrically operated pump, with associated fluid storage tank and heat exchanger and requisite fluid circuitry. The torque converter may be offset from the central axis of the engine and transmission, and driven in the offset position by mechanical means, such as a chain or gearing.

The present invention relates to a synchronous reluctance motor for an underwater pump having a stator and a rotor which comprises a fluid barrier section for forming one or more magnetic pole pairs, wherein the airgap between the rotor (12) and the stator (11) is at least partially filled with a ferrofluid (20). A further partial aspect of the invention relates to an underwater pump with such a synchronous reluctance motor for driving the pump.

A differential for a model car includes a housing having a chamber, four notches recessed in a periphery of the chamber and each having a trapezoid section, four blocks received in the notches respectively, a spider having four ends connected with the blocks respectively, four first bevel gears respectively sleeved on the ends of the spider, two second bevel gears received in the chamber and engaged with the first bevel gears respectively, a main gear sleeved on the housing, and two output shafts respectively passing through the main gear and the housing to be connected with the second bevel gears. Thus, the first bevel gears and the second bevel gears can be tightly engaged with each other by means of the arrangement of the spider and the blocks to eliminate the power loss of the model car.

The embodiment of the invention discloses a light-emitting diode (LED) display control circuit and a display screen, which are used for reducing power consumption and decreasing heat. According to the embodiment of the invention, the LED display control circuit comprises a constant-current circuit, a row scanning control circuit, and an LED group, wherein the LED group is connected between the row scanning control circuit and the constant-current circuit, and the LED display control circuit further comprises a voltage regulating circuit which is connected with the constant-current circuit; the row scanning control circuit is used for controlling LEDs in the LED group to switch on or off; the constant-current circuit is used for controlling working current of the LEDs in the LED group to be constant; and the voltage regulating circuit is used for regulating voltages at two ends of the constant-current circuit, so as to enable the voltages to meet the preset voltage range.

A wheel bearing unit (1) is embodied in a four-rowed angular contact ball bearing form.

The present invention discloses an electromagnetic driving wave soldering pot, includes an electromagnetic pump, a tin bath and a nozzle, and the electromagnetic pump includes an iron core, a coil group provided in the two iron core and a pump slot, the pump slot communicates with the nozzle, and the coils group includes three coils, which are supplied with three-phase alternating current excitation power supply having a phase difference of 120°. Because of the absence of any moving components and thus abrasion, the present invention not only overcomes the defects of being abrased badly and eroded easily, as well as solder being oxidized seriously in the conventional wave soldering pot, but also completely eliminates the power loss caused by the negative magnetic field in the alternating magnetic field, and effectively uses the power of the alternating magnetic field. Furthermore, because the energy consumption is decreased to 50% while the thrust and flow rate are Is increased over 2 times, this electromagnetic driving wave soldering pot can totally replace the conventional mechanical pump and meet the requirement of the practical production.

The invention belongs to the technical field of power transmission, in particular to a stepless transmission device. According to the technical scheme, a four-segment hydraulic mechanical composite transmission device comprises an input shaft, an output shaft, a planetary transmission component, a fixed shaft gear transmission component, a hydraulic speed regulating component, a segment-change operating component and an idler. One Lavina planetary mechanism is adopted as foundation, a multi-shaft fixed shaft gear and a synchronizer are utilized completely, three shunt modes of different-speed integrated torque, different-speed integrated speed and different-torque integrated speed are engaged reasonably, a four-segment continuous stepless speed change transmission structure, and the four-segment hydraulic mechanical composite transmission device has the advantages of simple structure, small size and the like; furthermore, by the aid of the four-segment hydraulic mechanical composite transmission device, purely mechanical transmission conditions of reverse gear and six fixed gears can be realized.

A vehicular air conditioning system may include a cam plate rotatably coupled to an air conditioning case via a cam shaft, wherein a portion of the cam plate may be connected to a regulating knob via a cable for selecting an air conditioning mode and wherein a portion of the cam plate may be integrally formed with a cam pivot projecting toward the air conditioning case, and an arm rotatably coupled to the air conditioning case via a door shaft and formed with a guide slot into which the cam pivot may be inserted, wherein the arm may be configured to rotate about the door shaft while the cam pivot pushes a portion of the guide slot as the cam plate rotates.

The invention discloses a method, a system and a device of adjusting sensitivity of a vibration switch and belongs to the technical field of electronics. The method includes the following steps: when a microprogrammed control unit (MCU) receives interrupt signals of the vibration switch, counting vibration times of the vibration switch within a preset time, if vibration times of the vibration switch within the preset time period reach the preset time, enabling a MCU module to withdraw from a sleeping mode, and entering a main program; if the vibration times of the vibration switch within the preset time period are smaller than the preset time, and enabling the MCU module to keep the sleeping mode. The method of adjusting sensitivity of the vibration switch can adjust sensitivity of the vibration switch flexibly, and solve the problems that the sensitivity of the vibration switch is not adjustable and misoperation is caused due to interrupted instantaneity in the MCU module.

The invention provides a starting circuit for an integrated circuit of a power factor correction control chip, which comprises a rectification circuit and a charge pump circuit, wherein the output ofthe rectification circuit is connected to a power supply pin of the chip by a starting resistor; and the output end of the charge pump circuit is connected with the power supply pin of the chip. The starting circuit comprises a first current path and a second current path, wherein the input end of the first current path is connected with the starting resistor, and the output end of the first current path is connected with the power supply pin of the chip; the input end of the second current path is connected with the starting resistor, and the output end of the second current path is connectedwith the earth potential; when the power is switched on, the first current path is switched on, and the second current path is switched off; and when the power factor correction control chip operatesnormally, the first current path is switched off, and the second current path is switched on.

The invention provides an impeller surface equivalent wind speed prediction method of an impeller surface of a large-scale wind turbine generator. The method comprises the following steps: step 1, measuring wind speed of each height of a virtual impeller surface in front of the wind turbine generator through a laser radar; step 2, calculating the equivalent wind speed of the virtual impeller surface according to the measured wind speed data of each height of the virtual impeller surface; step 3, acquiring an actual impeller surface equivalent wind speed by utilizing the wind turbine generatormodel and sensor measurement data; and step 4, inputting the calculated equivalent wind speed of the virtual impeller surface into a BP neural network after passing through a time shifting model. Themethod adopts the laser radar for wind measurement, the accuracy is high, power loss caused by wind measurement lag is eliminated, the equivalent wind speed of the impeller surface can be accurately predicted, and therefore the design of an advanced prediction control strategy of the wind turbine generator set is more effectively served, and reliable input is provided for advanced prediction control of the large-scale wind turbine generator set.

This invention aims at preventing a thunderbolt attack detecting circuit from determining that no thunderbolt is approaching because the thunderbolt attack detecting circuit turns to its initial condition due to power interruption caused by an approaching thunderbolt and is changed over into a normal condition in the thunderbolt approaching status maintained. This thunderbolt disaster protecting apparatus comprises a thunderbolt attack detecting circuit for determining whether or not any thunderbolt is approaching by detecting a thunderbolt signal and a switching mechanism for changing over to the normal condition in which a protection object device is connected to an electric path or to thunderbolt resisting condition in which the protection object device is separated from the electric path. And this apparatus obtains a control power supply from the electric path and is changed over to the normal condition at the normal time when no thunderbolt is approaching and to the thunderbolt resisting condition when any thunderbolt is approaching according to a signal from the thunderbolt attack detecting circuit. And when the control power is interrupted, after the control power is restored, this apparatus determines whether or not any thunderbolt is approaching in a predetermined time interval and changes over the status to thunderbolt resisting condition when any thunderbolt is approaching and to the normal condition when the condition is normal.