Abstract:
A light emitting device includes a plurality of micro diodes, which are electrically connected to constitute a bridge rectifier circuit. Each branch of the bridge rectifier circuit includes a single micro diode or a plurality of micro diodes. The light emitting device is electrically connected to an AC power source, which alternately drives the light emitting device in two current loops. Therefore, the micro diodes in two current loops of the bridge rectifier circuit emit light by turns.
Abstract:
A circuit for measuring the DC resistance of an inductor includes an input unit, a microprocessor module, a current source and a voltage detecting unit. The microprocessor module receives signals from the input unit and generates different signals to command constant currents through the inductor by the current source. The voltage detecting unit reads voltages of the inductor and outputs the voltages obtained to the microprocessor module. According to the currents and the voltages read, the microprocessor module may calculate the DC resistance(s) of the inductor.
Abstract:
A digital phase-locked loop having a phase frequency detector (PFD), a 3-state phase frequency detection converter (3-state PFD converter), a loop filter and a digital voltage-controlled oscillator is provided. The PFD receives an input frequency and a reference frequency and outputs a first signal and a second signal based on the phase difference between the input frequency and the reference frequency. The 3-state PFD converter outputs a 3-state signal according to the first and second signals, wherein the 3-state signal is presented in 1, 0 and −1. The loop filter outputs at least one control bit based on only the 3-state signal. The DCO adjusts the outputted oscillation frequency according to the control bit.
Abstract:
The present invention provides a phase shifter with reversely configured electric regulation units. The phase shifter has a chamber with a holding space, a first feeder unit and a second feeder unit at the sides of the holding space, and at least one reversely configured electric regulation unit. The regulation unit contains a first coupling set with a movable and a fixed coupling, and a second coupling set with a movable and a fixed coupling. A sync linkage mechanism is used to link the respective movable couplings. A push-pull unit is linked to a driven connection of the sync linkage mechanism. A cover plate seals the holding space. The phase shifter configuration makes it possible to reduce markedly the volume and space of the phase shifter, cut down the manufacturing cost and improve the mating accuracy with higher applicability.
Abstract:
The invention relates to a method of modifying electrical properties of carbon nanotubes by subjecting a composition of carbon nanotubes to one or more radical initiator(s). The invention also relates to an electronic component such as field-effect transistor comprising a carbon nanotube obtained using the method of the invention. The invention also relates to the use of the modified carbon nanotubes in conductive and high-strength nanotube/polymer composites, transparent electrodes, sensors and nanoelectromechanical devices, additives for batteries, radiation sources, semiconductor devices (e.g. transistors) or interconnects.
Abstract:
A buck converter includes a first MOSFET and a second MOSFET connected in series, a PWM module coupled to gates of the first MOSFET and the second MOSFET, and a control unit being coupled to the input current acquired unit, the input voltage acquired unit, the output current acquired unit, the output voltage acquired unit and the PWM module respectively, wherein the control unit controls a switch frequency of the PWM module and acquires the input current, the input voltage, the output current and the output voltage from the input current acquired unit, the input voltage acquired unit, the output current acquired unit and the output voltage acquired unit respectively.
Abstract:
A measurement circuit includes a switch unit with a number of keys selectively pressed to output different resistance regulating signals. A resistance setting circuit receives the resistance regulating signals and connects different resistances to a voltage circuit and a current circuit. The voltage circuit outputs different voltages. The current voltage receives a voltage from the voltage circuit and outputs a current to a capacitor. A detecting circuit measures a temperature of the capacitor and outputs the temperature to the resistance setting circuit. The resistance setting circuit compares the received temperature with a preset temperature. If the received temperature is equal to or greater than the preset temperature, the resistance setting circuit outputs short-circuit information of the capacitor. If the received temperature is less than the preset temperature, the resistance setting circuit outputs normal information of the capacitor. A display unit displays the information of the capacitor.
Abstract:
A motherboard detection device for a motherboard having a plurality of power input terminals. The power detection device includes a current sampling module, a voltage sampling module, a processor, and a display unit. The current sampling module is connected to the power input terminals for obtaining the current of each power input terminal. The voltage sampling module is connected to the power input terminals for obtaining the voltage of each power input terminal. The processor is connected to the current sampling module and the voltage sampling module for acquiring the current and the voltage of each power input terminal and calculating the input power of each power input terminal based on the current and the voltage of each power input terminal to obtain input power data. The display unit is connected to the processor for receiving the input power data from the processor and displaying the input power data.
Abstract:
Methods for preparing improved Panax Notoginseng saponin fraction from a Sanchi extract and its use in pharmaceutical compositions for treating or preventing a blood circulation disorder.