64 results about "Pulse rise time" patented technology

Methods and systems for providing emission of incoherent radiation and uses therefor are disclosed. A system for providing emission of high peak power (in watts) incoherent radiation, comprises an electrically impeded discharge lamp linked to an electrical energy supply. The lamp comprises a discharge chamber which is at least partially transparent to the incoherent radiation, a discharge gas in the chamber, two electrodes disposed with respect to the chamber for discharging electrical energy therebetween, at least one dielectric barrier disposed between the two electrodes to electrically impede electrical energy passing between the two electrodes, an electrical energy supply capable of providing fast risetime, high peak power unipolar linking the electrodes with the supply, the energy supply being capable of providing a sequence of high peak power unipolar voltage pulses from the energy supply to the electrodes and means to control (i interpulse period, and (ii) pulse risetime, whereby, in use, a substantially homogeneous discharge occurs between the two electrodes which causes emission of incoherent radiation pulses of high peak power from the lamp.

The invention relates to the technical field of electrical equipment and in particular relates to an ultrafast edge step pulse generating method and a generator thereof. In the invention, a high-precision clock reference source is used for generating a clock excitation signal exciting a high-speed comparator to generate a pulse signal of a faster edge, and a pulse amplitude adjustment circuit is used for amplifying and pre-shaping the amplitude of the pulse signal of the faster edge; then the pulse signal enters a pulse rising edge accelerating circuit, and the rising edge of the pulse signal after amplitude adjustment is further accelerated by utilizing the step recovery effect of a step recovery diode; meanwhile, the waveform of the output pulse signal is subjected to shaping and amplitude control so as to meet the requirements on the rising time, the amplitude and the overshoot pulse of a characteristic impedance tester; and finally, the pulse signal is output by using a pulse output interface. The output pulse rising time is 150ps, the amplitude is larger than 500mV, the overshoot pulse is smaller than 10 percent, and the prepulse can be ignored. The invention can discover or sense smaller impedance discontinuous distances.

The invention discloses a multi-pulse high-voltage triggering device of a rotary switch, and relates to the field of high-voltage pulse power sources. The problems that a rotary switch is triggered through a single high-voltage pulse in the prior art, the triggering voltage pulse rise time is long, and triggering is not reliable are solved. The multi-pulse high-voltage triggering device is composed of a grid electricity rectifying filtering circuit, a pulse signal source, a pulse control circuit, a semiconductor switch drive circuit, a high-power semiconductor switch, a semiconductor switch protection circuit, an energy storing capacitor, a high-voltage pulse transformer, an output detection feedback circuit and a PID regulation control circuit, wherein the grid electricity rectifying filtering circuit is electrically connected with a power supply, the pulse control circuit is electrically connected with the pulse signal source, the semiconductor switch drive circuit is electrically connected with the pulse control circuit, the high-power semiconductor switch is electrically connected with semiconductor switch drive circuit, the semiconductor switch protection circuit is electrically connected with the high-power semiconductor switch, the energy storing capacitor is respectively and electrically connected with the grid electricity rectifying filtering circuit and the high-power semiconductor switch, the high-voltage pulse transformer is electrically connected with the energy storing capacitor, the output detection feedback circuit is electrically connected with the high-voltage pulse transformer, and the PID regulation control circuit is electrically connected with the output detection feedback circuit. According to the multi-pulse high-voltage triggering device, the triggering pulse rise time is smaller than 10 microseconds, and triggering is reliable and stable.

The invention discloses an ultra-high voltage pulse transformer, which comprises a transformer component and an oil cylinder, wherein the transformer component is connected with the oil cylinder in a rapid connecting manner of a socket and a plug; the transformer component comprises a main transformer, a bias inductor, a capacitive voltage divider, a current transformer and an equipotential capacitor, which all are arranged on a semicircular bottom plate to be conveniently and quickly installed and maintained; the main transformer is formed by combining multiple groups of iron cores which are rectangular cutting iron cores in parallel; and corners of all iron cores are rounded. According to the ultra-high voltage pulse transformer, multiple problems that a traditional ultra-high voltage pulse transformer is huge in volume, heavy, not beautiful in appearance, complicated in structure, difficult to produce, assemble and maintain, too long in pulse rising time and the like, and the problem that surroundings and operators are harmed due to the fact that the radiation dose of dangerous rays exceeds the standard in online charging work are solved; the production cost is reduced; and the production efficiency is improved.

The invention provides a method for reducing damage of a substrate material by high-energy particle bombardment, wherein the method belongs to the field of plasma etching. The method comprises the steps of presetting a pulse modulation signal, wherein a pulse rising time t is shorter than D*T(D is the duty cycle of the pulse, and T is the period of the pulse); and then performing pulse modulation on a substrate bias RF power source through utilizing the pulse modulation signal as a modulation signal, thereby obtaining an RF modulation power with a rising edge t. Compared with the prior art, the method has advantages of reducing damage of a pulse modulation substrate material caused by high-energy particle bombardment at the early period of an offset voltage, ensuring high safety of the substrate material in an etching process, and realizing better performance of the etching device. Furthermore, according to different bias parameters required in etching, an appropriate t value can be selected so that the t value satisfies a requirement for etching various substrate materials. Furthermore the method can be combined with the discharging mode of different coil RF power sources, so that the method is adapted to different plasma discharging conditions.

Disclosed herein is a functional electrical stimulation (FES) device and system. In one embodiment, sequential bipolar pulse stimulation may be provided to an area of a living body via one or more electrode leads applied to the area via a FES device comprising a current pulse generating circuit comprising output nodes for operative coupling to the one or more electrode leads, and configured for operative coupling to a voltage supply. The current pulse generating circuit generally comprises positive and negative stimulation paths drawing from the voltage supply to respectively apply positive and negative currents through the area via the one or more electrode leads. In one example, the stimulation paths comprise respective capacitive elements, a capacitance ratio of which dictating, at least in part, an amplitude ratio of the positive and negative currents, wherein periodic alternative activation of the stimulation paths provides the sequential bipolar pulse stimulation. In another example, each path comprises a respective charging element and a respective activation switch, wherein each respective charging element is charged by the voltage supply and discharged upon activation of the respective activation switch to generate positive and negative current pulses respectively, such that a pulse rise time of the positive and negative current pulses is predominantly dictated by a switching speed of each respective switch. Systems and uses for these devices, and FES in general, are also described.

The invention provides a pulse generation device used for flue gas purification. According to the device, on the one hand, the technical scheme that a pulse power supply insulator and a discharge electrode insulator are arranged on a traditional pulse generation device respectively is improved, one insulator is directly used for making a pulse power supply and a discharge electrode connected, so that the cable length and the loop inductance are reduced, the pulse rising time is shortened, and the plasma generation efficiency in each unit of electric energy is improved; on the other hand, by using a series high-voltage switch set, the voltage of primary pulses is increased, so that the ratio of transformation of a pulse transformer is reduced, and the efficiency of the pulse transformer is improved. When the device is used for the flue gas purification, the flue gas purification efficiency can be improved on the basis of reducing energy consumption, and environmental requirements are met. The experimental results show that when the pulse generation device is used for the flue gas purification, the emission concentrations of flue gas pollutants can be reduced, that is the emission concentration of SO2 is reduced to 35 mg / m<3>, the emission concentration of NOx is reduced to 50 mg / m<3>, and the emission concentration of dust is reduced to 5 mg / m<3>. Besides, compared with the traditional pulse generation device, the power consumption is reduced to 38 KV from 50 KW, and the energy is saved by 24%.

The invention relates to a method for operating a light-emitting device, wherein in the method a pulse current having a pulse frequency is generated by a driver circuit (4), which has a clock generator providing clock signals for the current pulsing. The invention also relates to a light-emitting device that is coupled functionally to the driver circuit (4) and is formed with one of more organic light-emitting diodes (3), and upon which the pulsed current acts at a pulse frequency of approximately 10 kHz to approximately 100 kHz, where T_PWM < (T_rise + T_fall) and where T_PWM is the pulse length for the clock signals generated by the clock generator of the driver circuit (4) and T_rise and T_fall indicate the pulse rise and the pulse fall time for the current pulses present at the one or more organic light-emitting diodes (3). The invention further relates to a corresponding arrangement.