30 results about "Digital signal conditioning" patented technology

Circuitry for monitoring the operation of an optoelectronic transceiver includes a sequence of interconnected signal processing circuits for processing an analog input signal and producing a digital result signal, where the analog signal represents one or more operating conditions of the optoelectronic transceiver. The sequence of signal processing circuits include gain circuitry for amplifying or attenuating the analog input signal by a gain value to produce a scaled analog signal, an analog to digital converter for converting the scaled analog signal into a first digital signal, and digital adjustment circuitry for digitally adjusting the first digital signal to produce the digital result signal. The digital adjustment circuitry includes shifting circuitry configured to shift an input digital signal in accordance with a shift value so as to produce a digital shifted signal. The digital result signal is stored in memory in predefined locations accessible by a host.

The invention discloses a signal conditioning circuit, a conditioning method thereof and a double sampling retaining circuit. The signal conditioning circuit comprises a first chopping switch, a programmable gain amplifier, a second chopping switch, a double sampling retaining circuit, an analog-to-digital converter, and a digital reduction sampling filter which are connected in sequence. The double sampling retaining circuit samples outputs of the programmable gain amplifier in two-phase positions of a chopping clock, and the results of two samplings are added. and an added output voltage is transmitted to and processed by the analog-to-digital converter, and the digital reduction sampling filter. Since the double sampling retaining circuit is added, the invention avoids the residual and off-tune problem in a chopping amplifier. Meanwhile, the invention facilitates the integration of a single chip, without the need of external filtering capacitor. Furthermore, a novel sequential control reduces the consumption of a digital signal conditioning circuit based on a chopping amplifier.

The invention relates to a micro-current signal extraction system. A signal is sampled by adopting a high-precision resistor, a current signal is transformed into a voltage signal; the voltage signal is transmitted to an analog signal preconditioning circuit, and sequentially passes through a primary amplification circuit, an analog filter circuit and a secondary amplification circuit to complete analog signal preconditioning; the signal which is subjected to analog signal preconditioning is output to a digital signal preconditioning circuit, and sequentially passes through an A/D (analog to digital) conversion circuit and a range switching and digital filter circuit; and a required micro-current signal is output after the digital signal conditioning is completed. According to the micro-current signal extraction system, the analog signal and digital signal conditionings are combined, a chopper-stabilizer integrated operational amplifier with high gain, high input impedance and high common mode rejection ratio is selected for preposed amplification of the system, 50Hz power line interference is inhibited by a dual-integral AD analog-to-digital conversion chip, and the I/O (input/output) interfaces can be greatly saved by virtue of 4-line serial communication, and high-efficiency and reliable data transmission can be realized. The micro-current signal extraction system can realize accurate measurement on micro-current, and can be used for insulation monitoring of electrical equipment.

The invention discloses an automatic control system for a high-frequency high voltage static dust-collecting power supply based on DSP+FPGA. The automatic control system comprises a power supply plate, an analog digital signal conditioning plate, a DSP+FPGA main control panel, an IGBT (Insulated Gate Bipolar Transistor) driving plate and an upper computer, wherein the power supply plate is connected with the analog digital signal conditioning plate, the DSP+FPGA main control panel and the IGBT driving plate; the analog digital signal conditioning plate is used for collecting and conditioning the analog quantity and digital quantity in a main circuit of the dust-collecting power supply and transmitting the voltage analog quantity after being conditioned to the DSP+FPGA main control panel; the DSP+FPGA main control panel combines the collected information for sending a PWM (Pulse Width Modulation) signal and a relay control signal; after being conditioned through the signal conditioning plate, the relay control signal is used for controlling a relay; the PWM signal is used for controlling a full bridge inversion circuit in the main circuit of the dust-collecting power supply through an IGBT driving circuit; and the DSP+FPGA main control panel and the upper computer have data exchange through a CAN (Controller Area Network) bus. The automatic control system provided by the invention has the advantages that the data running is more stable, the system safety is high, the monitoring efficiency is increased and the response speed for output voltage adjustment is quickened.

Methods, systems and other embodiments associated with pre-processing a signal for spectral analysis are presented. A system for pre-processing a digital input signal includes a digital down converter (DDC), an interpolator, and a series of down samplers. The DDC modulates the digital input signal to create a down converted signal. The interpolator re-samples the down converted signal to produce a re-sampled signal. The series of down samplers produces down sampled signals. The multiplexer selects one of the digital input signal, the down converted signal, and the down sampled signals and routes the selected signal to an output line.

The invention discloses a subharmonic detection method based on cascade delay signal elimination method, comprising steps of obtaining a,b,c three-phase voltage signals of a power grid load terminal through a voltage sensor and a digital regulation circuit, utilizing a Clark transform to obtain a voltage signal under two-phase static coordinate system vabc=[va,vb,vc]<T>, (2) performing filtering process based on the delay signal elimination on the V alpha Beta which is obtained through transformation to obtain voltage signals which only contains odd- number harmonic component and voltage signal which only contains the even-number harmonic component, (3) performing filtering processing based on the cascade delay signal elimination on the voltage signals which only contain the odd-number harmonic wave component and the voltage signals which only contain the even-number harmonic component to obtain the components of positive sequence and negative sequence of any subharnonic, and (4) performing superposition on the harmonic components to obtain a total harmonic signal. The invention is high in detection accuracy and high a practicability.

This invention discloses a conditioning method for digital signals (DS).It includes the following aspects: adopt isolation MOS relay to condition export signal; adopt jumper clot to condition multi-voltage signal; adopt large current channel to condition single spot signal; adopt two-point difference export to condition difference signal; adopt serial light coupling and fabric method to condition export signal; adopt diode, light coupling and fabric method to condition two spot input signal. The advantages are low cost, small volume, easy to operate.

The invention discloses an analog and digital signal conditioning circuit for an electrostatic precipitating power supply control system, which includes an analog circuit part and a digital circuit part. The analog circuit part is used to collect and receive analog signals such as voltage, current, and temperature of the main circuit of the power supply, and perform conditioning, filtering, buffering, and photoelectric isolation on related signals; It is used to collect and receive switching signals such as the working state and fault state of the main circuit of the high-frequency power supply, and transmit control quantities such as control logic quantities and PWM waves. The two parts of the circuit are physically isolated, and each has an independent ground wire and power supply. The invention integrates the analog and digital circuits, completes the acquisition, conditioning and isolation of analog and digital signals, reduces the interference of power lines and ground wires, reduces the interference of high-frequency digital circuits to analog circuits, and improves the working stability. Reduced costs.

The invention discloses a multi-parameter high-precision water quality detection device, which comprises a sensor water tank, an overflow plate, a sediment buffer area, a sensor detection area, a water inlet, a water outlet, a water quality analysis sensor set, a lead, a detector, a display screen, a digital signal conditioning module, a temperature sensor, a pH sensor, a conductivity sensor, a dissolved oxygen sensor, a turbidity sensor, an AD acquisition unit, a display device, a power module, a controller unit, a signal conditioning unit and a data communication unit. Each sensor generatesa millivolt-level feedback signal under the action of 12V excitation voltage, multiple characteristic parameters such as water temperature and conductivity can be measured at the same time, and the measured characteristic parameters are conveniently transmitted to the AD acquisition unit for analysis.

The invention relates to a general test interface platform for master control of a wind generating set. The system is characterized in that the system comprises a signal conditioning circuit, the signal conditioning circuit is connected with an I/O interface of a master control system and a real-time simulation machine interface through a D-type data interface connector, and the signal conditioning circuit comprises a digital signal conditioning unit so as to convert 24V high and low level signals into 5V TTL signals; the signal conditioning circuit further comprises an analog signal conditioning unit so as to convert a 4-20 mA current signal into a 0-10 V voltage signal. The invention provides a plug-and-play signal universal interface platform for the detection and maintenance of the main control system, which can realize the detection and maintenance of different types of main control systems, obviously improve the maintenance efficiency, reduce the cost and save the space of a test site.

The invention relates to a detection electronic box failure diagnosis adapter. The detection electronic box failure diagnosis adapter adopts the following technical scheme that the detection electronic box failure diagnosis adapter comprises an analog signal conditioning circuit board, a digital signal conditioning circuit board, a voltage signal switching control module and a panel, the panel is provided with a VPC-9025 interface module connection block, an insertion module and a tested printed circuit board support, and a detection system is formed through the butt joint between the adapter and a test platform through the VPC-9025 interface module. According to the invention, detection, failure judgment and failure locating can be performed on a detected signal outputted by a printed circuit board of 16 circuit assembly part single board cards of a detection electronic box according to the detection time sequence and process of the detection electronic box, and electronic devices leading to printed circuit board failures are reported in the report printing manner, so advantages of easy operation and good reliability can be realized.

The invention discloses a digital signal conditioning device. The device comprises a test mainboard connected with a real-time system and a tested controller, wherein the test mainboard is provided with a real-time system docking circuit, a control circuit, a microcontroller, an interface circuit, a plurality of sampling circuits and a plurality of driving circuits separately; each sampling circuit is connected with the real-time system docking circuit and the interface circuit separately; each driving circuit is electrically connected with the control circuit and the interface circuit separately; and the control circuit is connected with the real-time system docking circuit, the microcontroller and the interface circuit separately. According to the invention, the control circuit receivesa control instruction sent by the microcontroller and controls the real-time system docking circuit, the driving circuit and the interface circuit to realize working mode conversion, driving circuit output mode conversion and the input and output modes of the interface circuit separately so as to cope with different circuit forms and improve system flexibility.