61results about "Altering measuring range circuits" patented technology

A current measurement system, comprising a plurality of parallel sensing circuits, each sensing circuit configured to measure a respective range of voltage corresponding to a current through a load, wherein each sensing circuit is triggered to initiate measurement of a voltage across the load in response to a buffer current through a common buffer reaching a respective threshold, a buffer circuit for inputting a virtual ground voltage or a virtual ground current to the load and to the plurality of parallel sensing circuits, the virtual ground voltage corresponding to the voltage across the load or the current through the load, and a processor coupled to the plurality of parallel sensing circuits, wherein the processor is configured to combine data representing voltage measurements from the plurality of parallel sensing circuits to determine the current through the load.

The utility model discloses a multi-range current acquisition circuit, which comprises a load current acquisition circuit and a current bypass circuit, the load current acquisition circuit is connected in series between a power supply and a load resistor RX, and the current bypass circuit is connected in parallel with one side of the load current acquisition circuit. According to the utility model, the current bypass circuit is designed to be connected in parallel with one side of the load current acquisition circuit, so that current acquisition is not influenced after normal switching of the load current acquisition circuit, and a new current path can be provided when the acquisition circuit is not switched so as to ensure that the load at the output end can work normally.

The invention discloses a seamless range switching system and a seamless range switching method for instrument current measurement. The seamless range switching system comprises a digital-to-analog converter, an error amplifier, a first driving circuit, a first current measurement circuit, a clamping circuit, a second driving circuit, a second current measurement circuit, two analog-to-digital converters and a field programmable gate array. The first current measuring circuit converts 10 [mu] A to 30 mA low current into a first voltage signal to form a negative feedback closed loop. When the first voltage signal reaches a Zener breakdown threshold value, the clamping circuit outputs a trigger signal to start the second driving circuit, so that the two driving circuits jointly provide a total current of 30mA to 500mA for the load; the two analog-to-digital converters perform synchronous sampling, and the field programmable gate array selects digital signal output which is in a linear measurement range and has an error not exceeding + / -0.05% of a full scale. No mechanical switch exists in the switching process, the current is uninterrupted, and wide-range high-precision continuous measurement is achieved.

A measuring system comprises a voltage converter circuit that converts and outputs a voltage between a first terminal and a second terminal, and a computing device that detects anomalies in the voltage converter circuit. The voltage converter circuit comprises: a first output circuit that outputs a first output voltage obtained by multiplying a potential of the first terminal with respect to a predetermined reference potential by a conversion gain; a second output circuit that outputs a second output voltage obtained by multiplying a potential of the second terminal with respect to the reference potential by a conversion gain; and a third output circuit that outputs a third output voltage obtained by multiplying a voltage between the first terminal and the second terminal by a conversion gain.The conversion gains of the first output circuit, the second output circuit, and the third output circuit can be set to values ​​of at least one first group and one second group, and the ratio between a first group conversion gain and a second group conversion gain set in the third output circuit differs from the ratio between a first group conversion gain and a second group conversion gain set in the first output circuit or the second output circuit.The computing device comprises the following: a voltmeter which measures the first output voltage, the second output voltage and the third output voltage, and a diagnostic unit which, using conversion gains of a selected group, which is one of the first group and the second group, calculates a first conversion value, a second conversion value and a third conversion value corresponding to input voltages of the first output circuit, the second output circuit and the third output circuit, based on the first output voltage, the second output voltage and the third output voltage, and determines that an anomaly exists if the sum of the first conversion value and the second conversion value deviates from the third conversion value by at least one predetermined value.

The utility model provides a kind of photoelectric sensor particle detection device and equipment based on double channel detection, it is related to optical particle detection technical field.The device sensor sampling circuit output end is connected with sampling signal distribution circuit input end;Sampling signal distribution circuit first output end is connected with first signal gain circuit input end, and second output end is connected with second signal gain circuit input end;First signal gain circuit output end is connected with first analog-digital conversion circuit input end;Second signal gain circuit output end is connected with second analog-digital conversion circuit input end;The gain coefficient of first signal gain circuit is greater than second signal gain circuit;The output end of first analog-digital conversion circuit and second analog-digital conversion circuit is connected with digital signal processing circuit.The utility model can make signal pass through different gain amplifier, double ADC sampling, make one way channel satisfy small particle measurement, another way satisfies large particle measurement, and the electrical signal of larger particle and smaller particle can be considered.

The current sensor may include a current detection unit that outputs a detection signal corresponding to the magnetic field generated in a conductor when a measurement current flows, and a signal processing unit that outputs an output signal by processing the detection signal. The signal processing unit may include a storage unit that stores a plurality of current sensitivity parameters corresponding to each of a plurality of current sensitivities that can be set for the current sensor, and a sensitivity setting unit that sets the current sensitivity of the current sensor based on one of the plurality of current sensitivity parameters stored in the storage unit.

The invention relates to a multi-range voltage sensor and a voltage measuring method thereof, and belongs to the technical field of sensors. Wherein the power supply unit comprises two isolated voltage-stabilizing power supply sub-units, and the active noise reduction unit is connected between the high-voltage side voltage-stabilizing power supply sub-unit and the processing unit for noise reduction; the voltage dividing unit is used for accessing to-be-measured high voltage and dividing the high voltage to output a voltage sampling signal; the processing unit is used for processing the voltage sampling signal; the V / I conversion unit is used for converting the voltage sampling signal into a current sampling signal according to a specified proportion; the fluxgate detection unit is used for detecting the current value of the current sampling signal so as to output a current detection signal, and the current value reflected by the current detection signal and the current value reflected by the current sampling signal are in a first fixed proportion; the sampling unit is used for converting the current detection signal into a voltage detection signal according to a second fixed proportion and outputting the voltage detection signal. The high voltage to be measured is measured based on the working principle of the fluxgate, and the voltage measurement precision can be remarkably improved.

The invention discloses an alternating current detection circuit, an LED driving power supply and a lighting device, and relates to the technical field of LED power supply control, the circuit is connected between an alternating current power supply and a microcontroller, and the circuit comprises a signal rectification module used for converting an alternating current input voltage into a full-wave rectification signal; the signal conversion module is used for processing the full-wave rectification signal and outputting a pulse filtering signal and a direct-current voltage signal of which the amplitude tracks the peak value of the full-wave rectification signal; the reference generation module is used for generating a reference voltage signal in a preset proportion with the peak value of the full-wave rectification signal according to the direct-current voltage signal; and the signal comparison module is used for comparing the pulse filtering signal with a reference voltage signal and outputting a pulse signal of which the frequency is the same as that of the full-wave rectification signal to the microcontroller.

A method is provided for examining the cathodic protection of a metallic and in particular ferromagnetic pipeline. An inspection device is also provided for examining the cathodic protection of a pipeline, in particular of a ferromagnetic pipeline. The inspection device is formed to be able to pass through the pipeline and in particular be driven by the medium, and includes a magnetizing device serving to create an alternating magnetic field. A magnet unit and a measuring device are provided, and includes at least one magnetic field sensor serving to measure a magnetic field formed on the inner side of the wall of the pipeline.

This application provides a current acquisition circuit and a current acquisition device, belonging to the field of current measurement technology. The current acquisition circuit includes a controller and a first current acquisition module and a second current acquisition module connected in series. The first current acquisition module includes a first current acquisition element and a first processing circuit connected in parallel. The second current acquisition module includes a second current acquisition element, a second processing circuit, and a first control circuit connected in parallel. The first processing circuit is used to acquire and process a first voltage signal from the first current acquisition element and output the first voltage signal to the first control circuit and the controller. The second processing circuit is used to acquire and process a second voltage signal from the second current acquisition element and output the second voltage signal to the controller. The first control circuit is used to turn on when the current corresponding to the first voltage signal exceeds a second current range and to turn off when the current corresponding to the first voltage signal is within the second current range. This current acquisition circuit can solve the interference of switching current ranges on current measurement.

This suppresses the decrease in current measurement accuracy caused by the skin effect. [Solution] The current sensor comprises a shield having an opening for taking in a magnetic field generated by a current flowing through a conductor, a magnetic field sensor disposed inside the shield and outputting a sensor voltage corresponding to the magnetic field at that location, and a detection circuit disposed outside the shield and detecting a current based on the sensor voltage of the magnetic field sensor, wherein the magnetic field sensor includes a first magnetic field sensor for detecting low-frequency magnetic fields and a second magnetic field sensor for detecting high-frequency magnetic fields, the first magnetic field sensor being disposed closer to the opening than the second magnetic field sensor, and the second magnetic field sensor being disposed further from the opening than the first magnetic field sensor.

The invention discloses a multi-range current measurement circuit and method, and the circuit comprises a wide-range measurement branch, a medium-range measurement branch, a medium-range current bypass, a small-range measurement branch, a small-range current bypass, and an amplification circuit. The current of a to-be-measured object is divided into two branches after passing through a wide-range measurement resistor; the current of one branch is grounded through the middle-range current bypass, the current of the other branch flows into the middle-range measuring branch and then flows into the amplifying circuit through the small-range measuring branch, and the small-range current bypass is connected with the small-range measuring branch in parallel; the neutral small-range current bypass is configured to be switched on when the current flowing into the corresponding range measurement branch exceeds the full current of the range, and the amplification circuit is configured to adjust the gain, so that the voltage to ground of the branch node of the wide-range measurement resistor approaches to zero potential. Multi-range current synchronous measurement is realized, range switching is realized through the medium-range current bypass and the small-range current bypass, the measurement precision is ensured, and stable output of a power supply is facilitated through the amplification circuit.

The application belongs to the technical field of current measuring equipment, and particularly relates to an invasive current measuring device, which comprises an input sampling measuring module, a front-stage protection and sampling switch module and a rear-stage protection and sampling switch module. The input sampling measuring module comprises an input port, a sampling circuit, a signal output circuit, a first node and a second node. The front-stage protection and sampling switch module comprises a first-stage switch circuit, an input current monitoring circuit and a third node. The rear-stage protection and sampling switch module comprises a second-stage switch circuit. The application adopts single gear measurement and common input ports through the input sampling measuring module, the front-stage protection and sampling switch module and the rear-stage protection and sampling switch module, so as to effectively simplify the mechanical structure and the circuit structure of the multimeter. In addition, through the cooperation of the plurality of second-stage switch circuits and the sampling circuit, a plurality of ranges are flexibly realized, and a larger measurement range and higher resolution are further realized.

The utility model relates to the technical field of sensors, in particular to a high-precision double-range current sensor, a closed-loop circuit comprises a self-checking coil SC and a sampling resistor Rm, the self-checking coil SC is used for generating an excitation signal, the excitation signal is converted into an output signal through the closed-loop circuit, and the sampling resistor Rm is connected with the self-checking coil SC. The sampling resistor Rm is used for providing sampling current for the large-current range circuit and the small-current range circuit, and the large-current range circuit is connected to the two ends of the sampling resistor Rm in series; compared with a conventional sensor, according to the scheme, double-path output is adopted, a measured current wire penetrates through the sensor, the functions of amplification and signal conditioning of currents of different ranges are achieved through two paths of operational amplifiers, an external auxiliary circuit is matched, and therefore the function of high-precision double-range current measurement is flexibly achieved; according to the scheme, the current sensor adopts a closed-loop scheme to improve the signal-to-noise ratio and the detection precision, and is very suitable for occasions of high-precision current detection in a power electronic system.

The invention discloses a single-channel wide-range high-precision direct current detection circuit, and relates to the technical field of current detection, and the circuit comprises a current sensor module which employs a closed-loop Hall current sensor and is used for the non-contact induction of a detected current; the resistance sampling unit is electrically connected with the current sensor module and is used for converting the compensation current into a voltage signal; the resistance sampling unit is composed of a sampling resistor R1 and a sampling resistor R2. The control module is used for controlling the multi-range switching module to perform range switching on the measuring circuit according to the range of the measured current and based on a set access mode; the multi-range switching module is composed of a relay; and the bypass current suppression module is connected in series with a circuit between the current sensor module and the resistance sampling unit and is used for eliminating a shunting error caused by the sampling resistor R1 when the relay bypasses. According to the invention, high measurement precision, low noise and high stability of current measurement can be realized.

A battery management device according to one embodiment includes a first comparator that compares a voltage of a battery cell with a first reference voltage, a switching circuit that sets a path electrically connecting the battery cell to a first path or a second path based on a comparison result by the first comparator, and an impedance calculation unit that calculates an impedance of the battery cell based on a first voltage applied via the first path or a second voltage applied via the second path.

An electronic indicator (3) is provided with: an NFC communication antenna (17) that communicates with a mobile terminal (20) having a short-range wireless communication function and receives power from electromagnetic waves emitted by the mobile terminal (20) by electromagnetic induction; a setting value storage unit (12) that stores setting values including a phase line form, a VT ratio, and a CT ratio; an NFC communication control unit (16) that operates by the power received by the NFC communication antenna (17) and receives a setting value from the mobile terminal (20); and a control device (8) that stores the setting value received by the NFC communication control unit (16) in a setting value storage unit (12).

A measurement instrument for measuring a radio frequency signal is described. The measurement instrument includes a radio frequency input for receiving the radio frequency signal and at least one electronic component for processing the radio frequency signal. The at least one electronic component is configured to process the radio frequency signal based on a setting. The measurement instrument includes at least one interface that is configured to obtain resource information of at least one resource unit of the radio frequency signal received. The measurement instrument includes at least one circuit that is configured to adapt a setting of the at least one electronic component for level setting of the measurement instrument based on the resource information obtained.

The invention provides a circuit breaker device and a metering method, and relates to the technical field of low-voltage electric appliances. The device comprises a signal acquisition unit, a metering unit, an external power supply and a power supply circuit, the signal acquisition unit comprises a first mutual inductor and a second mutual inductor; the output ends of the first mutual inductor and the second mutual inductor are connected with the input end of the metering unit; and the output end of the metering unit is connected with external equipment through a bus. The output end of the first mutual inductor is also connected with the power supply circuit; the external power supply is connected with the power circuit. And the metering unit is used for switching on the first mutual inductor or the second mutual inductor according to the second output signal of the second mutual inductor and a preset threshold range, and outputting the first output signal of the first mutual inductor or the second output signal of the second mutual inductor to external equipment through the bus. By designing the metering unit and the threshold value judgment strategy, decision can be made based on the metering unit, and accurate metering of large current and accurate metering of small current signals are achieved.

The application discloses a high-precision wide-range current detection circuit, which comprises an auxiliary operational amplifier A1, a power tube MP, a sampling tube MS, a PMOS tube PM0, a resistor RS, an operational amplifier OP, a charge pump, a driving module and a high-voltage domain floating ground module. The load current IL is proportionally sampled, and the current signal is converted into a voltage signal VSENS by using the sampling resistor RS. The source potential of the sampling tube MS and the power tube MP is forced to be balanced by using the auxiliary operational amplifier A1. The source voltage of the power tube MP is sampled and fed back to the operational amplifier OP. The output signal of the operational amplifier OP is transmitted to the driving module. The power supply of the driving module is provided by the charge pump and the high-voltage domain floating ground module. The driving module dynamically adjusts the gate voltage of the power tube MP. The application reduces the input end mismatch of the operational amplifier and keeps the current detection proportional accuracy accurate in the highest to lowest range of the load current.

The invention provides a current sampling circuit and a radio frequency power supply. The current sampling circuit comprises a first sampling resistor, a second sampling resistor, a sampling power supply and a current sampling control unit, the first sampling resistor is connected with a power supply and a load; the second sampling resistor is connected with the voltage output end of the sampling power supply and a load; the current sampling control unit is connected with the first sampling resistor, the second sampling resistor and the sampling power supply. And the current sampling control unit is used for controlling the sampling power supply to boost the output voltage under the first working condition until the current direction of the first sampling current flowing through the first sampling resistor is detected to be overturned, and acquiring the second sampling current flowing through the second sampling resistor as the load current to be output when the current direction is overturned. And the current sampling control unit is also used for acquiring the first sampling current as load current output under the second working condition. According to the invention, wide-range and high-precision current detection can be realized.

The present application belongs to the technical field of current test, and particularly relates to a current test method, which comprises building a current test loop, a plurality of current meters with different ranges are arranged in parallel in the test loop, and each current meter is connected with an independent switch in series, a plurality of groups of parallel current meters and corresponding switches are arranged, the problem of insufficient precision when a single large-range current meter is used to test a small current is avoided, accurate values can be read by matching the current meters with corresponding ranges, accurate test of the whole stage of current change is realized, the test loop is not interrupted throughout the whole process by the operation of initially reading with a maximum-range current meter and then switching to a matching-range meter, the small-range current meters are protected from damage by excessive current, the continuity of the test process is ensured, test loss and process interruption risk are reduced, the current of each stage can be more accurately tested, complex debugging is not needed, and the efficiency of current test is improved.

The utility model discloses a portable current detection device, relates to the technical field of current detection, the portable current detection device comprises a housing, a power supply unit, a sampling resistor, a control unit and a display unit are arranged in the housing, the power supply unit is respectively connected with the control unit and the display unit and supplies power to the control unit and the display unit, and the sampling resistor is connected with the sampling resistor. The sampling resistor is used for being connected with current to be measured, the control unit is connected with the sampling resistor and used for obtaining voltage values at the two ends of the sampling resistor, and the display unit is connected with the control unit and used for displaying the current value of the current to be measured. The control unit calculates the current value of the current to be measured by obtaining the voltage values at the two ends of the sampling resistor, the small current can be measured without using a table-type multimeter and a handheld multimeter, and the measuring device is small in size and convenient to carry, improves the convenience of current measurement, and reduces the measurement cost.

Systems and methods described herein provide a current sensor based on magnetic field detection having multiple sensor arrangements with multiple, different sensitivity ranges. The outputs of the multiple sensor arrangements can be combined to generate a single output signal. The current sensor can include two or more sensor arrangements, each having one or more magnetic field sensing elements, and configured to sense a magnetic field in different first measurement ranges corresponding to different ranges of currents through the conductor and further configured to generate different magnetic field signals indicative of the sensed magnetic field in the respective measurement range. The current sensor can include a circuit configured to generate an output signal indicative of a combination of the different magnetic field signals that corresponds to the current through the conductor.

The invention discloses a driving voltage adjustable test circuit and equipment, and is applied to the field of integrated circuits. In the driving voltage adjustable test circuit, an isolation power supply circuit, an adjustable voltage circuit and a test drive circuit are connected in sequence and are connected with a circuit to be tested. The isolation power supply circuit establishes electrical isolation for the first voltage source and the adjustable voltage circuit, the electromagnetic compatibility is improved, and the safety of personnel and equipment is guaranteed. An adjustable resistor in the adjustable voltage circuit can be adjusted according to the driving voltage required by the circuit to be tested so as to ensure that the adjustable voltage circuit outputs the required driving voltage to the circuit to be tested, so that the requirements of different circuits to be tested are met, the flexibility of circuit adjustment is improved, and the application range is expanded; and meanwhile, the design cost of the circuit is reduced. And the test driving circuit provides a test signal of which the turn-on / turn-off speed can be independently controlled for the circuit to be tested, so that the test process can be repeated, and the data repeatability and the dynamic parameter characterization precision are remarkably improved.

Electrical circuit (22) for generating an analog signal for a vehicle (10), in particular a railway vehicle, the electrical circuit (22) comprising two input terminals (30, 32) configured to receive a predetermined electrical voltage defined between said input terminals (30, 32), the electrical circuit (22) further comprising a main branch (34) connecting said input terminals (30, 32), in which the main branch (34) comprises a plurality of sensing resistors (R1, R2), connected in series between said input terminals (30, 32), each sensing resistor (R1, R2) having a different value with respect to each value of the other sensing resistors (R1, R2), and the main branch comprising for each sensing resistor (R1, R2), two short-circuiting terminals (40) configured to short-circuit the respective sensing resistor (R1, R2).

The invention relates to the field of charging piles, in particular to a real-time testing system and method for a super charging pile and a medium. The system comprises a composite current sensing module, a signal conditioning and acquisition module and a central processing unit. The composite current sensing module is connected in parallel with the shunt and the magnetic sensor and is respectively matched with the first and second current ranges, and the upper limit of the first range is lower than the lower limit of the second range. The signal conditioning and acquisition module carries out conditioning and analog-to-digital conversion on current analog signals of the selected sensors, and the central processing unit judges the measuring range according to the current digital signals, generates switching control signals, switches the corresponding sensors, carries out data fusion on different path signals and outputs continuous current measurement values. Through the combined type current sensing design and the intelligent measuring range judgment and data fusion functions, the core problem that an existing single sensor is difficult to consider high precision, low power consumption and safe isolation within the wide measuring range of 1A-1000A is effectively solved, and full-measuring-range stable measurement is achieved.

The invention relates to a method for determining a measured value of a current sensor pair (11, 11U, 11V) comprising a first current sensor (11a) and a second current sensor (11b), each configured to measure the intensity of a current, wherein the first current sensor (11a) has a first measuring range and the second current sensor (11b) has a second measuring range, the first measuring range being larger than the second measuring range. The method comprises the acquisition of a first measured value of the first current sensor (11a) and a second measured value of the second current sensor (11b) (S100), and a first weighting factor and a second weighting factor are determined depending on the magnitude of the acquired first measured value of the first current sensor (11a) and / or the magnitude of the acquired second measured value of the second current sensor (11b) (S110).Depending on the first measured value of the first current sensor (11a), the second measured value of the second current sensor (11b), the first weighting factor, and the second weighting factor, the measured value of the current sensor pair (11, 11U, 11V) is then determined (S120). The invention further relates to a drive unit (100) and a current sensor pair (11).

The invention relates to the technical field of lightning current monitoring, and discloses a dual-channel multiple lightning current waveform monitoring system, which comprises two acquisition coils, two groups of signal amplification circuits, an FPGA sampling module and an MCU master control module, the two acquisition coils are respectively connected to the FPGA sampling module through two groups of signal amplification circuits; and the two groups of amplifying circuits have different amplification factors to configure large and small range channels. And the FPGA performs parallel high-frequency A / D sampling on the two paths of amplified signals and transmits data to the MCU. And the MCU compares and analyzes the two paths of data: if the waveform data of the channel with the smaller measuring range is not subjected to saturation distortion, the waveform data of the channel with the smaller measuring range is selected as a monitoring result, and otherwise, the waveform data of the channel with the larger measuring range is selected as a monitoring result. According to the invention, accurate identification of multiple lightning stroke current pulses possibly generated in the same lightning stroke event can be realized, and high-efficiency and high-precision acquisition of currents with different intensities can be realized.