39results about How to "Eliminate spikes" patented technology

A harmonic frequency conversion module is disclosed including a polarization maintaining (PM) fiber optical link for providing an output stabilized from power fluctuation by the inclusion of one or more polarizers in the PM fiber optical link. Removing polarization distortions removes noise which has a significant negative effect on the output of harmonic frequency conversion elements. It has been found that the noise in frequency converted light has additional components, caused by mode interaction during conversion. In accordance with the present invention, we are able to remove the spikes in this noise, making it more stable and less dependent on external conditions. If the PM optical fiber route consists of multiple elements creating polarization distortions, a polarizer should be inserted between the most distorting element and the output of the fiber system. If many elements contribute to polarization distortions, several polarizers can be inserted into the system.

The invention discloses an informatization remote monitoring system based on big data. The informatization remote monitoring system comprises a smoothing input circuit, a rectified feedback circuit and a voltage stabilizing output circuit. According to the smoothing input circuit, an inductor L1, a capacitor C1 and a capacitor C2 are used for forming pi-type circuit smoothing, then signals are input into the rectified feedback circuit, according to the rectified feedback circuit, an amplifying circuit composed of a triode Q1 and a triode Q2 is used for conducting differential amplification onthe signals, meanwhile, a rectifying circuit composed of an operational amplifier AR1, an operational amplifier AR2, a variable resistor R15 and a capacitor C3 is used for rectifying the signals, meanwhile, a triode Q3 and a triode Q5 are used for feeding back and correcting the potential of output signals of the rectifying circuit, a triode Q4 is used for conducting positive feedback on an emitting electrode signal of the triode Q2, and finally the voltage stabilizing output circuit applies a voltage stabilizing circuit composed of a triode Q6, a triode Q7 and a voltage stabilizing tube D4 toconduct outputting after voltage stabilization, so that signals in a signal transmission channel are used for automatically and effectively correcting data signals received by the informatization remote monitoring system based on the big data, and signal turbulence is prevented.

The invention discloses a common-mode voltage suppression method of a voltage source inverter, which belongs to the technical field of power electronics. In each control cycle of the present invention, an alternative voltage vector is selected according to the voltage vector used in the previous cycle and the sector where the current vector is located in this cycle, and then the objective function is optimized according to the alternative voltage vector, so as to obtain the optimal voltage for this cycle vector and apply it to the inverter. Since the present invention fully considers the influence of the dead zone on the common mode voltage when selecting the alternative voltage vector, the influence of the dead zone can be completely overcome. Therefore, the present invention can be applied to photovoltaic grid-connected inverters or motor drive controllers to reduce the influence of common-mode voltages.

The invention relates to a method for measuring the public measure value of region, wherein said method comprises: obtaining the effective data sending amount and relative power in the measure period, via the data amount relative to the data confirm signal and relative transmission power in the measure period, then writing said value into formula to obtain the region public measure vale; based on the data that lost caused by in maximum retransmission times, using the data amount that sent at the start as effective data amount, and using the sum of N times of transmission powers as relative power; based on the condition that not receiving data confirm in the measure period, using the last effective value as measure value. The invention can obtain better region public measure value, to execute the load control better. And the invention also discloses a relative device.

The invention discloses a method and device for leveling a scattering path line of a distributed fiber-optic sensing system. The device comprises a synchronizing signal generating module, a photodetector and a clock signal generating module, wherein a signal output interface of the synchronizing signal generating module is connected with a control interface of a light source driving module and a control interface of a modulus converter, and a control interface of the synchronizing signal generating module is connected to a control interface of a discrete type digital delayer; the light source driving module is connected to a light source; an output interface of the photodetector is connected with a signal input interface of the modulus converter and a minuend input interface of a subtracter, and an output interface of the modulus converter is sequentially connected with the discrete type digital delayer, a digital-analog converter and the minuend input interface of the subtracter; the clock signal generating module provides a clock for the modulus converter, the discrete type digital delayer and the digital-analog converter; the output of the light source, the input of the photodetector and the output of the subtracter are respectively used as a light output interface, a light input interface and a signal output interface of the whole device.

The invention provides an adaptive filter which effectively eliminates noise and peaks with 2kHz-1MHz frequency in an industrial power distribution system. According to the adaptive filter, harmonic power frequency voltage is independently used as reference voltage, and a harmonic component is traced along the reference voltage. Noise consists of a series of random peaks and has no alternating current and direct current difference, so that the noise can be filtered in the traditional RC (Resistance-Capacitance) or RCL (Resistance-Capacitance-Inductance) circuit and an active filtering network. Voltage reduction can ensure that a used large-value capacitor can effectively extend a filtering frequency range to 2kH2. The method is high in cost and large in space occupation.

The invention relates to an ambient light compensation circuit for an infrared receiving device, comprising a potential detection unit, a voltage integration unit and a voltage-current conversion unit connected in sequence, wherein the potential detection unit is used to receive a first voltage signal (VSAM) , and compare the first voltage signal (VSAM) with the reference voltage; the voltage integration unit includes a first switch (SW1) for controlling the charging of the capacitor and a second switch (SW2) for controlling the discharging of the capacitor, according to the output of the potential detection unit The signal controls the first switch (SW1) and the second switch (SW2), so as to charge or discharge the capacitor to output a second voltage signal (VX), and the voltage-current conversion unit is used to convert the second voltage signal ( VX) is converted to output compensation current. The invention can realize ambient light current compensation and realize stable gain.

The invention discloses a method for controlling chip temperature during quick thermal treatment. The method comprises the following steps of: naturally heating a chip within a first time interval; and at the end of the first time interval, quickly heating the chip at a second time interval. The method is characterized in that: the change rate of the temperature rising speed of the chip at the second time interval is between -1.5 DEG C / s<2> and -1.2 DEG C / s<2>; and preferably, the change rate of the temperature raising speed of the chip at the second time interval is -1.2 DEG C / s<2>. According to the temperature rising control method, a peak phenomenon can be eliminated effectively and the chip yield is increased.

The invention discloses a method for sampling analog signals, comprising: responding to sampling requests for high-frequency analog signals and low-frequency analog signals, simultaneously starting a high-frequency timer and a low-frequency timer to perform timing work; wherein, the high-frequency timer The timing of the timer is cleared from the first timing initial value to the high-frequency timing period and reset from zero; the timing of the low-frequency timer is cleared from the second timing initial value to the low-frequency timing period and restarted from zero Timing; the low-frequency timing period is an integer multiple of the high-frequency timing period, the difference between the first timing initial value and the second timing initial value is greater than zero and is not in multiples of the high-frequency timing period ; When the timing value is detected to be zero, the sampling module is triggered to sample the analog signal. Correspondingly, the invention also discloses an analog signal sampling device. By adopting the embodiments of the present invention, the accuracy of analog signal sampling is improved, and low-frequency sampling is prevented from affecting high-frequency sampling.