93results about How to "Eliminate power loss" patented technology

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 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 λ_C, and λ₁<λ_C and λ₂>λ_C.

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 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.

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.

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.

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.

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.

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 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.

The present invention provides a vibration power generator, a vibration power generating apparatus, and a communication apparatus having vibration power generating apparatus mounted thereon, wherein the vibration power generating apparatus is provided with a vibration power generator (200), a rectifying circuit bridge (205), an output power control circuit (201), a load circuit (202), and a frequency detecting circuit (204). Power generated by means of the vibration power generator (200) can be efficiently extracted by detecting the frequency of the vibration power generator (200) and controlling the impedance of the output control circuit (101) in accordance with the frequency.