39results about How to "Eliminate spikes" patented technology

The novel single-stage power processing DC-AC inverter topology with high frequency isolation transformer eliminates the four-transistor unfolding full-bridge stage and provides the output AC voltage at high power conversion efficiency. The new inverter topology has only three switches, two resonant capacitors, a resonant inductor, an output inductor and a small size high-frequency isolation transformer, which does not store the DC energy. The output AC voltage is obtained by the PWM sinusoidal modulation of the duty ratio control of the three switches and can be regulated against the input voltage changes.

A spiking neural network in which communication and computation is performed on data represented as points in actual time. Such neural networks provide new ways of performing computation in human-engineered computing systems that employ the same basic paradigm as the mammalian neocortex. Information is encoded based on the relative timing of individual voltage spikes produced, consumed, and computed upon by groups of neurons. Component and interconnection delays are an integral part of the computation process. Multi-connection paths between pairs of neurons are modeled as a single compound path. Multi-layer networks are trained from the input layer proceeding one layer at a time to the output layer. Training involves a computation that is local to each synapse, and synaptic weights are determined by an averaging method. The action of inhibitory neurons is modeled as a bulk process, rather than with individual neurons.

The invention relates to a bandwidth optimized multimode fiber and a manufacturing method thereof. The multimode fiber comprises three parts, including a fiber core, a quartz glass cladding and a coating with graded index profile. By adopting the method of optimizing the impurity gas flow curve, the refractive index profile parameter of a fiber core is controlled to optimize the optimal bandwidth of the fiber at the communication window of 850nm.The largest change of the differential mode time delay of the fiber is less than 0.22ps/m, the over-filled launch bandwidth is larger than 3,500MHz.km and 500MHz.km respectively at 850nm and 1,300nm and the valid mode bandwidth is larger than 4,700MHz.km and 500MHz.km respectively at 850nm and 1,300nm.The multimode fiber of the invention decreases the chromatic dispersion between modes and the time delay and increases transmission bandwidth, thereby not only meeting the application requirement of a low speed network, but also meeting the application requirement of a gigabit high speed broadband network.

A method and an apparatus for monitoring an operating state of at least one tire of a vehicle are provided. The monitored operating state may be, for example, the air pressure of the tire. One tire state variable that represents the current operating state of the tire, and one calibration variable that represents the target tire state of the tire, are taken into consideration in the monitoring. The monitoring is accomplished in different monitoring modes, i.e., the particular monitoring mode employed is determined as a function of at least one driving state variable representing the driving state. In an example embodiment, for a given driving state variable, the vehicle speed is selected as the differentiation criterion for the different monitoring modes.

The invention discloses an automatic switching system of a power supply. The system is used for automatically switching an external power supply to an emergency power supply to realize uninterrupted power supply. The automatic switching system is characterized by comprising a power supply switching circuit; the power supply switching circuit comprises an emergency power supply bt1, a fuse f200, a fuse f201, a fuse f203, a mem2313 chip, a resistor r1, a resistor r2, a resistor r3, a resistor r4, a resistor r5, a resistor r6, a resistor r7, a resistor r8, a diode d1, a diode d2, a diode d3, a diode d4, a diode d6, a diode d5, a diode d200, a diode d201, a diode d210, a diode d211, an audion q1, a capacitor c10, a capacitor c200, a capacitor c211, a capacitor c201, a capacitor c222, an inductor l200, a switch s1 and an AT89S51 single-chip microcomputer. The power supply switching system is designed, and the external power supply can be automatically switched onto the emergency power supply under the condition that the external power supply is abnormal, so that uninterrupted power supply of the system is guaranteed.

The invention discloses an analog signal sampling method. The method comprises steps as follows: responding sampling requests for high-frequency analog signals and low-frequency analog signals, and starting a high-frequency timer and a low-frequency timer for timed work, wherein the high-frequency timer starts timing from a first timing initial value, resets at the low-frequency timing cycle and starts timing from zero again; the low-frequency timer starts timing from a second timing initial value, resets at the low-frequency timing cycle and starts timing from zero again; the low-frequency timing cycle is an integral multiple of the high-frequency timing cycle, and the difference between the first timing initial value and the second timing initial value is larger than zero and is not in a multiple relation with the high-frequency timing cycle; a sampling module is triggered to sample analog signals when the timing value is detected to be zero. Correspondingly, the invention further discloses an analog signal sampling device. With the adoption of the embodiment, the sampling accuracy of the analog signals is improved, and the condition that high-frequency sampling is affected by low-frequency sampling is avoided.

The present invention provides an analog-to-digital conversion method based on Gray coding and absolute value algorithm. Gray coding is used to eliminate possible peak pulses in coding. By introducing absolute value algorithm, the sudden change phenomenon of each pipeline output is effectively eliminated, so that The output of each pipeline is represented by a continuous analog conversion process using a unified analytical algorithm without using sub-A/D and sub-D/A to effectively reduce the noise introduced in the encoding process. Since the conversion adopts the gray coding method, it can effectively improve the reliability of the coding, and the conversion process does not need sub-A/D and sub-D/A, which can reduce calculation errors and improve conversion accuracy. The encoding unit and the computing unit are independent, which avoids the feedback link of the sub-D/A and helps to improve the conversion speed.

The invention provides a binary analog-to-digital (AD) conversion method based on a cosine algorithm and a Gray code, which is characterized by comprising the following steps: sampling an analog input signal Ui; based on the cosine algorithm, calculating the n-bit data value Yn of the analog input signal Ui, wherein n is a natural number; comparing the data value Yn with zero to obtain an n-bit Gray code value Gn; and using the sequence of the Gray code Gn as an AD conversion output signal of the analog input signal. By using the Gray code mode, spike pulse possibly existing in the code can be eliminated; and due to the introduction of the cosine function algorithm, a full parallel coding method is realized. By using the concatenated pipeline type coding method based on the cosine algorithm, the jumping of the pipeline output of each stage can be effectively eliminated.

The invention relates to an ambient light compensation circuit for an infrared receiving device. The circuit comprises a potential detection unit, a voltage integration unit and a voltage-current conversion unit which are connected in sequence, wherein the potential detection unit is used for receiving a first voltage signal (VSAM) and comparing the first voltage signal (VSAM) with a reference voltage; the voltage integration unit comprises a first switch (SW1) for controlling the charging of a capacitor and a second switch (SW2) for controlling the discharging of the capacitor, and the first switch (SW1) and the second switch (SW2) are controlled according to an output signal of the potential detection unit, so that the capacitor is charged or discharged to output a second voltage signal (VX); and the voltage-current conversion unit is used for converting the second voltage signal (VX) to output a compensation current. According to the invention, the ambient light current compensation can be realized, and the stable gain is realized.

An amplifying circuit based on a current feedback operational amplifier to realize common-mode rejection of high-frequency signals, which is composed of cascaded n-level instrumentation amplifier circuits, wherein, n≥1, and the instrumentation amplifier circuits of each level are composed of two current-feedback The non-inverting input terminal of the current feedback operational amplifier B1 is connected to the spike signal source, and the same input terminal of the current feedback operational amplifier A1 is connected to the avalanche signal source (the avalanche signal will be superimposed on the spike signal), and the current The output terminal of the feedback operational amplifier An and the output terminal of the current feedback operational amplifier Bn are respectively connected to two input terminals of a radio frequency transformer T. The present invention solves the technical defect that high differential mode gain cannot be achieved by using radio frequency amplifiers, and has the characteristics of high common mode rejection ratio; its high bandwidth characteristics meet the requirements of high frequency signal processing, and at the same time, the method of cascaded gain solves the problem caused by The problem of limited gain of the current feedback method also achieves the purpose of realizing high-precision identification of avalanche signals.

The invention discloses a filtering method used for a three-phase unbalanced load compensation device. The method comprises the following steps of a charging direct voltage signal integration acquisition step: integration is performed on a direct voltage signal generated when the three-phase unbalanced load compensation device is charged from zero, wherein the direct voltage signal is a Ch1 signal, at an assigned moment, the Ch1 signal is started to be sampled, simultaneously a direct voltage signal generated when the three-phase unbalanced load compensation device discharges maintains a zero voltage till that the sampling of the Ch1 signal is completed and the signal returns to zero, wherein the direct voltage signal is a Ch2 signal; a discharge direct voltage signal integration acquisition step: integration is performed on the direct voltage signal generated when the three-phase unbalanced load compensation device discharges from zero, wherein the direct voltage signal is the Ch2 signal, at an assigned moment, the Ch2 signal is started to be sampled, simultaneously the direct voltage signal generated when the three-phase unbalanced load compensation device is charged maintains a zero voltage till that the sampling of the Ch2 signal is completed and the signal returns to zero, wherein the direct voltage signal is the Ch1 signal; and a returning step: the charging direct voltage signal integration acquisition step is returned to.

The invention provided an iron tower stress and vibration detection device, which comprises a shell body, wherein holes are formed in the two sides of the shell body, and a steel wire penetrates through the shell from the holes in the two sides and then is fixed to an iron tower; an upper polar plate and a lower polar plate are arranged in the shell body, the upper polar plate and the lower polarplate are respectively fixed in the shell body through a first spring and a second spring, a middle polar plate is arranged between the upper polar plate and the lower polar plate, the middle polar plate is fixed on the steel wire, and the three polar plates are connected with a detection circuit; an exciting coil is arranged in the shell body, is close to the steel wire, is fixed under the steelwire and is connected with the driving circuit; and the detection circuit and the driving circuit are connected with a processor module. The iron tower stress and vibration detection device integratesiron tower stress detection and vibration detection, and has the advantages of being convenient to install, high in detection precision and low in cost.

The invention discloses a communication base station safety monitoring device, which comprises a power supply module, an electric energy acquisition module, a controller and a wireless module. The power supply module is used for providing a stable +5V power supply; the electric energy acquisition module adopts a voltage sensor to detect a voltage signal on a power supply line of a power supply ofthe communication base station in real time; a signal amplification conditioning circuit effectively filters interference of magnetic devices in the communication base station and external electromagnetic clutter signals by applying a band-pass filter principle, and effectively eliminates bias voltage, so that the accuracy of a detection signal amplification value is ensured; an anti-interferencestabilizing circuit effectively eliminates interference when harmonic waves or voltage surges exist in the power supply line of the communication base station power supply, so that the anti-interference performance of the monitoring device is improved; and the controller sends the electric energy detection data to a background monitoring server through the wireless module for monitoring and management, so that accurate remote monitoring of the power supply performance of the communication base station is achieved. Good reliability and maintainability are achieved.