222results about "Voltage dividers" patented technology

Method for estimating the voltage value relating to a live element uses five capacitors, wherein a first capacitor has its first pole connected to said live element; a second capacitor has its first pole connected to said live element; a third capacitor has its first pole connected to the second pole of the first capacitor and its second pole connected to ground; a fourth capacitor has its first pole connected to the second pole of the second capacitor and its second pole connected to the first pole of a fifth capacitor. The voltage value is estimated using: 1) a voltage value relating to a first node positioned along the conducting wire that connects the first capacitor to the third capacitor 2) a voltage value relating to a second node positioned along the conducting wire that connects the fourth capacitor to the fifth capacitor; 3) a capacitance value of the third capacitor; 4) a capacitance value of the fourth capacitor; 5) a capacitance value of the fifth capacitor.

The invention discloses a voltage and current synchronous measurement method for a high-voltage power supply of a fusion device, which is suitable for accurately sampling and monitoring voltage and current signals of each key node of the high-voltage power supply of the fusion device. According to the method, firstly, a resistance-capacitance voltage division technology is adopted, a front-end high-voltage attenuation network is constructed by utilizing high-precision resistors and capacitors, and stable voltage division and linear attenuation of high-voltage signals are achieved; then, electrical isolation is realized through a small-signal voltage and current transformer, and multi-channel synchronous acquisition of voltage and current signals is completed respectively. Then, the ADC module adopts two multi-channel AC sampling special electric energy metering chips to realize ten-channel synchronous acquisition of high voltage and current signals. And finally, the FPGA receives, processes and analyzes the acquired data in real time, and transmits a result to an upper computer monitoring platform. According to the method, the synchronism, the precision and the anti-interference performance of a fusion power supply high-voltage measurement system are remarkably improved, and reliable data support is provided for safe and stable operation of a fusion device.

The embodiment of the utility model provides a range switching circuit and a formation and capacity grading system, and belongs to the technical field of electronic circuits. The range switching circuit comprises: a reactor circuit comprising a plurality of reactors; a sampling circuit coupled to the reactor circuit to detect a current flowing through the reactor circuit; the range switching module comprises a switch control circuit and at least one bypass switch module, the bypass switch module is connected with the at least one electric reactor in parallel, a switch control pin of the bypass switch module is connected with the switch control circuit, and the rate of a switch signal output by the switch control circuit is larger than the sampling rate of the sampling circuit; and the current compensation module is connected with the sampling loop of the sampling circuit and is used for performing current compensation under the condition that the current of the sampling loop changes suddenly. According to the embodiment of the invention, the current measurement precision of the battery in the formation and capacity grading process is improved.

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 invention discloses a self-adaptive high-precision voltage detection device and method for a high-voltage bushing end screen, the device comprises a high-voltage arm unit, a low-voltage arm unit, a signal acquisition unit, a control unit and a power supply unit, and the high-voltage arm unit takes the capacitance characteristic of a high-voltage bushing as a high-voltage arm; the high-voltage arm unit is connected with the low-voltage arm in parallel, the low-voltage arm is connected with the signal acquisition unit, and the signal acquisition unit is connected with the control unit; the power supply unit is connected with the low-voltage arm unit and the control unit. Wherein the signal acquisition unit is used for monitoring partial voltage and current signals of the low-voltage arm unit, the partial voltage and current signals are fed back to the control unit for processing, parameters of the low-voltage arm unit are dynamically adjusted to maintain a stable partial voltage ratio, and the capacitance value of the high-voltage bushing is measured and monitored. By means of the device, the influence of high-frequency parameter changes on the high-voltage bushing can be quantified, and more accurate and stable online monitoring is achieved.

The utility model provides a voltage sampling circuit based on electric field coupling and a radio frequency matcher. The voltage sampling circuit based on electric field coupling comprises a voltage sampling probe and an adjustable voltage dividing unit. The voltage sampling probe is used for acquiring a high-frequency high-voltage signal output by the radio frequency matcher through electric field coupling based on a distributed capacitor formed by the voltage sampling probe and sampling points of the radio frequency matcher, and outputting the acquired high-frequency high-voltage signal to the adjustable voltage dividing unit; and the adjustable voltage division unit is used for performing voltage division on the high-frequency and high-voltage signal by using the adjusted voltage division multiple after being triggered and adjusted, and outputting the high-frequency and high-voltage signal after voltage division to the processing module. According to the utility model, based on a distributed capacitor formed by the voltage sampling probe and the sampling points of the radio frequency matcher, an output voltage signal is obtained through electric field coupling, voltage sampling with electrical isolation is realized, and the problem of long installation and debugging time of the voltage sampling probe and the radio frequency matcher is solved by adjusting the voltage division multiple of the adjustable voltage division unit.

The semiconductor device includes: an insulating layer provided on a semiconductor substrate; a first resistor embedded in the insulating layer and electrically connected to a node on a first potential side; a second resistor embedded in the insulating layer; a third resistor embedded in the insulating layer; and a reference electrode electrically connected to a node on a second potential side of the third resistor. An absolute value of the first potential is greater than an absolute value of the second potential. The first resistor, the second resistor, and the third resistor are connected in series. The first resistor is formed by connecting N resistors in parallel, the second resistor is formed by connecting M resistors in parallel, and the third resistor is formed by connecting L resistors in parallel, with N<L and M<L satisfied.

A system and method for compensating for drift in a switch gear voltage sensor. The system includes a circuit, and an electronic processor. The circuit is configured to receive a first signal from a first capacitor of the voltage sensor and receive a second signal from a second capacitor of the voltage sensor. The circuit is further configured to generate a third signal and a fourth signal based on the first signal and the second signal. The electronic processor is configured to receive the third signal and the fourth signal and determine an angular frequency, a phase difference, a resistance value, a voltage across a compensation capacitor, an initial gain, a capacitance of the second capacitor, a capacitance and a voltage of the compensation capacitor, and a final gain.

The utility model relates to measuring alternating current parameter technical field discloses alternating current parameter tester, include: the signal acquisition module for carrying out the collection to the product parameter signal of measurement, prevent the short circuit protection module of instrument appearance short circuit or reverse connection and influence test process, signal acquisition module includes the voltage division unit, filter unit, AD conversion unit that connect gradually, short circuit protection module includes signal amplification unit, signal isolation unit, on-off control unit that connect gradually. The utility model has the advantages of high collection precision, fast speed, good stability by precision resistance voltage division, then filtering processing, and the analog signal is converted into digital signal and handles, can use in high temperature and normal temperature environment, newly added short circuit protection module that can test the protection of product, no matter what kind of circuit problem appears in the process of testing the product, can realize automatic protection, will not influence the alternating current parameter measurement of test instrument to product.

A circuit and method for measuring an average current of a solenoid valve, relating to the technical field of automotive electronics. The circuit comprises a solenoid valve (110), a first power supply (120), a sampling resistor, a field effect transistor drive circuit (130), a current acquisition circuit (140), an integrator circuit (150), and an integration reset circuit (160); the field effect transistor drive circuit (130) is used for controlling an on-off state of a first field effect transistor on the basis of a pulse width modulation gating signal; the first power supply (120) is used for providing a drive current for the solenoid valve (110) when the first field effect transistor is in an on state, and the drive current flows through the sampling resistor; the current acquisition circuit (140) is used for sampling voltage signals on two sides of the sampling resistor, and outputting the voltage signals to the integrator circuit (150); the integrator circuit (150) is used for performing integration processing on the voltage signals, and determining an average current of the solenoid valve (110) on the basis of an integration result; and the integration reset circuit (160) is used for performing periodic reset processing on the integrator circuit (150) on the basis of the pulse width modulation gating signal.

The utility model discloses an insulation detection circuit and device based on unbalanced bridge mode, insulation detection circuit includes power, upper bridge arm, lower bridge arm and the first switch of connecting between upper bridge arm and lower bridge arm, one end of upper bridge arm is connected with the positive pole of power, one end of lower bridge arm is connected with the negative pole of power, and upper bridge arm includes first resistance to be measured, second switch and first voltage dividing resistance, and lower bridge arm includes second resistance to be measured, third switch and third voltage dividing resistance. The efficient, stable, sensitive insulation detection scheme based on unbalanced electric bridge mode of the application can monitor the insulation state of electrical equipment under complex environment in real time, and through effective signal processing, the safety and reliability of equipment are improved.

The invention relates to a measuring transducer arrangement (1) with an annular carrier element (7), which is made of an electrically conductive material, and a voltage sensor (3), which comprises a conductor film (15) arranged on the carrier element (7) and having a first layer (23) and a second layer (24). The first layer (23) has at least one strip-like measuring electrode (27), which is connected to an electrical measurement potential. The second layer (24) has at least one strip-like earth electrode (28), which is connected to an electrical earth potential. The carrier element (7) is connected either to the measurement potential or to the earth potential.

To provide a means for more easily determining the internal voltage of an insulated connection used in extra-high voltage lines or high-voltage lines. [Solution] A system for measuring the internal voltage of an insulating connection 10 used in extra-high voltage lines or high voltage lines, which is provided with at least an insulator 11, a shielding electrode 12, an internal electrode 13, an open port 14, and an insulating plug 15, comprising at least a unit to be measured 20 consisting of one or more dielectrics connected in series with the insulating plug 15, a voltmeter 30 capable of measuring the voltage value of any one of the one or more dielectrics, and a calculation unit 40 that calculates the internal voltage of the insulating connection 10 by multiplying the voltage value of the dielectric to be measured by a coefficient assigned to at least each component of the unit to be measured 20.

The application discloses a standard capacitance voltage divider for measuring wide-range voltage and a measuring method. The standard capacitance voltage divider for measuring wide-range voltage comprises an insulating outer cylinder, an electrode module arranged at the upper end inside the insulating outer cylinder and a low-voltage arm module arranged at the bottom outside of the insulating outer cylinder. The electrode module comprises a high-voltage electrode, a low-voltage electrode and a shielding electrode. The high-voltage electrode, the low-voltage electrode and the shielding electrode are coaxially combined. The lower end of the shielding electrode is connected with a lower flange arranged at the bottom of the insulating outer cylinder through a supporting rod. The low-voltage arm module comprises a low-voltage arm external box and a low-voltage arm. The low-voltage arm external box is fixed at the lower end of the lower flange. The low-voltage arm is arranged in the low-voltage arm external box. The wide dynamic voltage can be reliably and accurately measured.

To provide an abnormality detection device which can eliminate a pull-up resistor for voltage monitoring.SOLUTION: A pull-down resistor Rdu is composed of two voltage dividing resistors Rdu1 and Rdu2 which divide voltage between an inter-arm connection point Nu being a connection point between an upper arm element 61 and a lower arm element 64 and the ground, and connects the inter-arm connection point Nu and the ground. A determination unit 25 detects abnormality of at least the upper arm element 61 and the lower arm element 64 based on voltage of a voltage dividing point Du being the connection point of the two voltage dividing resistors Rdu1 and Rdu2. A power supply line Lp and the inter-arm connection point are not connected through a pull-up resistor. The determination unit 25 detects ON fastening abnormality and OFF fastening abnormality of the upper arm element 61 and the lower arm element 64 based on voltage of the voltage dividing point Du when leak current IL flows to the ground from an upper arm element drive circuit 31 through the pull-down resistor Rdu during operation of the upper arm element drive circuit 31.SELECTED DRAWING: Figure 2

The invention relates to a line sensor (200) for being mounted to a power line (1a, 1b, 1c). The line sensor (200) comprises: i) a housing (202) for containing line sensor electronics (210); and ii) a voltage-sensing capacitor (240) in connection with the housing (202). The line sensor (200) is characterized by an electric circuit (600) being connected in parallel with the first capacitance (C1) for receiving a harvested voltage (VH) standing over the two capacitor plates (242, 244), the electric circuit (600) being configured for operating in an energy harvesting mode and / or a voltage-sensing mode. The line sensor (200) is further characterized by a slot antenna (250) being integrated in the first, upper, one (242) of the capacitor plates, wherein in the second, lower, one (242) of the capacitor plates an opening (255) is provided for allowing radio-frequency waves generated by the slot antenna to be transmitted through the opening (255). Thereby a single component multi-purpose structure is formed enabling both the energy harvesting mode and the voltage sensing mode as well as wireless communication with other units.

Sensored insulation plug for a medium voltage or high-voltage separable connector in a national grid, and operable to insulate a connection element of the separable connector on an elevated voltage and to simultaneously detect and sense the elevated voltage. The sensored insulation plug comprises a) a plug body formed by a solidified insulating material, b) an externally accessible detection contact, c) a primary capacitor, operable as a high-voltage capacitor in a sensing voltage divider for sensing the elevated voltage, the primary capacitor having i) a high-voltage electrode; ii) a sensing electrode embedded in the plug body; iii) a dielectric formed by a first portion of the insulating material, and d) a testpoint capacitor, operable as a high-voltage capacitor in a detection voltage divider for detecting the elevated voltage and comprising i) the high-voltage electrode, ii) a testpoint electrode, embedded in the plug body and electrically connected to the detection contact, and iii) a dielectric formed by a second portion of the insulating material.

A topical nerve activation patch includes a flexible substrate, a dermal adherent bottom surface of the substrate including an adhesive and adapted to contact a user's dermis, a flexible top outer surface of the substrate, a plurality of electrodes positioned on the patch proximate the bottom surface and beneath the top outer surface and coupled to the flexible substrate, a power source, and electronic circuitry generating an output voltage applied to the electrodes. The electronic circuitry includes a controller, a voltage monitoring circuit coupled to the controller, a current monitoring circuit coupled to the controller, a switch coupled to the controller, and a two-stage boost circuit coupled to the switch and the power source configured to increase a switch voltage level to approximately half of a final output voltage before increasing to the final output voltage.

To provide an overcurrent detection circuit which can detect overcurrent without efficiency deterioration of a switched capacitor converter.SOLUTION: An overcurrent detection circuit (2) is configured to detect overcurrent of current outputted from a switched capacitor converter (SCC2) having a plurality of capacitors (C1 to C3) and a plurality of switching elements (M1 to M8). The overcurrent detection circuit includes: a first application end (T1) configured so that input voltage of the switched capacitor converter is applied; a second application end (T2) configured so that output voltage of the switched capacitor is applied; and detection parts (R1 to R2, R4 to R7, OP1, IS1, Q1 to Q5, COMP1) configured to detect the overcurrent based on a difference between the output voltage and an integer multiple or reciprocal integer multiple of the input voltage.SELECTED DRAWING: Figure 4

The invention provides a method and a device for testing resistivity temperature characteristics of a solid insulation sample wafer and a medium. The method comprises the following steps of: connecting solid insulation sample wafers in series; connecting a gap breakdown assembly on the solid insulation sample wafer in parallel; each solid insulation sample wafer is heated; determining the breakdown voltage of the gap breakdown assembly, and determining the partial voltage ratio of the solid insulation sample wafer; and determining the resistivity ratio of the solid insulation sample wafer to obtain a resistivity temperature characteristic curve of the solid insulation sample wafer. According to the invention, the breakdown voltage of the gap breakdown assembly is determined through the gap breakdown assembly connected in parallel with each solid insulation sample, and the partial voltage ratio of the solid insulation sample is determined; and determining the resistivity ratio of the solid insulation sample wafer at n different temperatures based on the partial pressure ratio of the solid insulation sample wafer, and further determining the resistivity ratio of the solid insulation sample wafer at different temperatures so as to obtain the resistivity temperature characteristic curve of the solid insulation sample wafer.

The application relates to a series resonance experiment device and relates to the technical field of electric load detection instruments.The device comprises a variable-frequency power supply, an excitation transformer, a reactor and a voltage divider.The variable-frequency power supply is connected with the reactor through the excitation transformer.The reactor is connected in series with a product to be tested, and the voltage divider is arranged between the reactor and the product to be tested for test control.The reactor comprises a vertically arranged shell, an axially arranged coil winding, an axially movable magnetic core assembly and a driving mechanism.The magnetic core assembly is composed of multiple detachable sub-magnetic cores.The driving mechanism is used for adjusting the axial position of the magnetic core assembly, so that part of the sub-magnetic cores enter the inside of the coil winding, and the equivalent inductance of the coil is adjusted.The structure is beneficial to continuously adjusting the inductance value, adapting to the experimental requirements under different resonance conditions, and improving the debugging efficiency and the parameter control accuracy.

A leakage detection device that applies a leakage detection method, is applied to a vehicle, and includes a detection unit, a sampling unit, and a signal processing unit. The detection unit is separately connected to two-phase discharge paths of a power supply and is used to separately establish detection loops of the two-phase discharge paths when the power supply discharges. The sampling unit is electrically connected to the detection unit and is used to collect a first detection voltage of a first-phase discharge path and / or a second detection voltage of a second-phase discharge path from the detection loop. The signal processing unit is connected to the sampling unit, asynchronously receives the first detection voltage and the second detection voltage from the sampling unit, and is used to determine the leakage characteristics of the power supply according to the first detection voltage and the second detection voltage.

The invention discloses a detection circuit and a detection method for ground insulation resistance of a photovoltaic panel. The detection circuit for the ground insulation impedance of the photovoltaic panel comprises a first switch, a second switch and a third switch, wherein the first end of the first switch is connected to a connection point of a first insulation impedance and a second insulation impedance; the second end of the first switch is connected to a second grounding point; the first end of the voltage dividing module is connected with the first output end of the photovoltaic panel, the second end of the voltage dividing module is connected with the second output end of the photovoltaic panel, and the third end of the voltage dividing module is connected with the second end of the first switch; the voltage division module at least comprises a resistance voltage division unit which performs voltage division on the first end and the second end of the voltage division module and outputs the voltage through the third end of the voltage division module; the voltage sampling module is used for detecting the output voltage of the photovoltaic panel and detecting the voltage between the second end and the third end of the voltage division module; and judging whether the first grounding point and the second grounding point are in common ground according to the detected voltage change.

A circuit device and an electronic apparatus. The circuit device includes: a voltage division circuit that divides a voltage to be measured and outputs the divided voltage to a voltage division node; a comparison circuit that compares the voltage of the voltage division node with a reference voltage; and a control circuit. The voltage division circuit includes first to n-th resistors provided in series between a voltage node to be measured and a voltage division node, and first to n-th transistors in which an i-th transistor and an i-th resistor are connected in parallel. The control circuit sets the j-th transistor to one of ON and OFF, sets the first to (j-1)-th transistors to the other of ON and OFF, and outputs measurement data by determining the ON or OFF of the j-th transistor on the basis of the comparison result of the comparison circuit.

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.

A battery pack voltage measurement circuit including a relay unit controlling battery pack voltage measurement, first and second branching units provided between a battery pack voltage input terminal and the relay unit, and branching a battery pack voltage into different paths according to the battery pack voltage and then supplying the branched voltage to the relay unit, and a voltage distribution unit dividing the battery pack voltage supplied through the first or second branching unit and the relay unit and outputting the divided battery pack voltage to an output terminal.

The invention discloses a capacitive inductive voltage sensor ultra-wideband response performance expansion circuit and a test method. According to the circuit, the ultra-wideband response capability is improved by cascading a hybrid integrating circuit, a high-pass filtering module and a voltage follower; the hybrid integrating circuit is formed by connecting a passive integrator (self-integrating to process low frequency and suppress high-frequency noise) and an active integrator (reducing high frequency in a differential mode) in series to cooperatively broaden the frequency band; the high-pass filter filters DC bias, and the voltage follower realizes impedance matching and signal isolation. Experiments prove that the hybrid voltage sensor can realize good waveform reduction on sinusoidal signals as low as 5Hz and steep waves as high as 10MHz, and the voltage division ratio is stable; for a 1kHz signal, after the circuit is inserted, the output phase is consistent with the input, the amplitude is accurately restored according to the designed voltage division ratio, the phase lead and the amplitude attenuation are effectively inhibited, the traditional frequency band limitation is broken through, and the circuit is suitable for an ultra-wideband voltage measurement scene.

Disclosed in the present invention are a chip port state detection circuit, a chip, and a communication terminal. The chip port state detection circuit, by means of a port detection conversion circuit, converts the state of a port to be detected into a corresponding voltage and respectively outputs same to a first comparator and a second comparator, which, after comparing same with a corresponding input reference voltage, output a logic signal to a chip ID determination circuit to obtain a chip ID corresponding to the state of the chip port to be detected, in order to distinguish multiple identical chips. In another aspect, by means of a dynamic bias current production circuit, from the start of the establishment of a power source voltage to before the establishment of the power source voltage is completed and after the establishment of the power source voltage is completed, respectively providing a bias current and a static operating point to the first comparator and the second comparator; thus, detection of the state of the chip port to be detected is completed before the communication terminal recognizes the chip, satisfying the demands for quick detection of the chip port to be detected, and satisfying the demands for static low power consumption and real-time detection by the chip port state detection circuit.

The embodiment of the utility model provides a current sampling circuit, a battery management system, a battery device and electric equipment, and the current sampling circuit comprises a diverter which is connected with a detected battery cell group in series; the sampling chip is connected with the diverter in parallel and is used for collecting the voltage at the two ends of the diverter and determining the current flowing through the detected battery cell group based on the collected voltage; the first bidirectional protection assembly is connected in parallel between the diverter and the first sampling pin and is used for performing overvoltage protection on the first sampling pin in positive and negative directions; the second bidirectional protection assembly is connected in parallel between the diverter and the second sampling pin and is used for performing overvoltage protection on the second sampling pin in positive and negative directions; the first filtering assembly is connected between the bidirectional protection assembly and the flow divider in series and used for filtering common-mode noise at the two ends of the flow divider. Therefore, the safety and reliability of the current sampling circuit can be improved, faults caused by transient overvoltage and common-mode interference are reduced, and the precision of current sampling is improved.

A system for measuring characteristics of a current transformer according to an embodiment of the present invention comprises: a power source having a constant voltage; a current transformer to be tested to measure characteristics; a first current transformer including a core on which a primary winding and a secondary winding are wound, respectively; a voltage regulator which varies the voltage applied from the power source and applies the varied voltage to the primary winding; a power cable which is formed to pass through the core of the current transformer to be tested and through which a current corresponding to the voltage of the secondary winding induced according to the voltage applied to the primary winding flows; a shunt resistor which connects both ends of the power cable to form a circuit composed of the power cable; a detection unit for detecting the voltage of the shunt resistor and the output current of the current transformer to be tested; and a measurement unit which receives the voltage value of the shunt resistor and the output current value of the current transformer to be tested from the detection unit and compares the current value calculated from the voltage value of the shunt resistor with the output current value of the current transformer to be tested so as to measure the characteristics of the current transformer to be tested.