38results about "Measurement using ac-dc conversion" patented technology

A display device according to an embodiment of the present disclosure may comprise a stand and a head supported by the stand, including a display and a battery, wherein the head is electrically connected through a pogo pin provided in a connector of the stand, wherein the head further comprises a main board configured to obtain an operating state of the head and an input voltage input to the head through the pogo pin, and determine whether an error has occurred in the pogo pin based on the operating state of the head and the input voltage.

A signal processing system may include a sensor readout channel configured to convert an electronic signal into a digital quantity. The sensor readout channel may include a sigma-delta modulator having a modulator input and a modulator output, first system-level chopping switches located at the modulator input, an auxiliary path comprising an analog-to-digital converter (ADC) having an auxiliary path input and an auxiliary path output, the auxiliary path input configured to receive as its input signal a signal output by a memory element of the sigma-delta modulator, second system-level chopping switches located downstream of the sigma-delta modulator and the auxiliary path, and a signal combiner configured to combine a modulator output signal generated by the sigma-delta modulator with an auxiliary path output signal generated by the auxiliary path to generate a combined output signal.

(Figure 3) A signal processing system 100A includes a sensor readout channel that converts an electronic signal into a digital quantity. The system includes: a sigma-delta modulator 114; first sy

A system includes a rectifier configured to rectify a line power having a line energy, a buck converter configured to generate a desired voltage output based on the rectified line power, and a bypass capacitor disposed between the rectifier and the buck converter, wherein the bypass capacitor is configured to bypass a switching energy of the buck converter to attenuate a plurality of pulses of the rectified line power that are not attenuated by the buck converter, and wherein the plurality of pulses correspond to harmonics of the rectified line power.

An electricity meter (2) for measuring one or more characteristics (4) of an electrical input (6) associated with a power source comprises a first analog-to-digital converter (ADC) (10a), a second ADC (10b) and a processing resource (12). The first ADC (10a) is configured to receive an ADC input signal (18) representing an electrical input and to generate a first ADC output data sequence (20a) representing the electrical input during a time period from the ADC input signal (18). The second ADC (10b) is configured to receive an ADC input signal (18) representative of the electrical input and to generate a second ADC output data sequence (20b) representative of the electrical input during the time period from the ADC input signal (18). The processing resource (12) is configured to determine a cross-correlation average data sequence (40) corresponding to a time period based on the first and second ADC output data sequences (20a, 20b), and to determine one or more characteristics (4) of the electrical input (6) during the time period based on the cross-correlation average data sequence (40) corresponding to the time period.

Provided is a circuit capable of accurately testing the number of coil turns even with a transformer having a high turns ratio. A transformer turns number testing circuit is able to connect primary-side coils and secondary-side coils of a reference transformer and a to-be-tested transformer in phase and in series, and includes: a reference-side resistance element included in a reference-side loop circuit formed between both ends of the secondary-side coil of the reference transformer; a to-be-tested-side resistance element included in a to-be-tested-side loop circuit formed between both ends of the secondary-side coil of the to-be-tested transformer; and a voltage detector provided in a common line of the reference-side loop circuit and the to-be-tested-side loop circuit, the common line connecting a midpoint between the secondary-side coils of the reference transformer and the to-be-tested transformer and a midpoint between the reference-side resistance element and the to-be-tested-side resistance element.

Circuit arrangement for measuring conductor current, wherein a current transformer generates an input voltage from the current, and a first output of a diode bridge circuit is located at the connection of two identical first electrodes of diodes, where a measuring resistor is inserted between two identical second electrodes of the diodes of the diode bridge circuit, a second output of the diode bridge circuit is located at the connection one diode to the second electrodes and the measuring resistor, and an extended bridge node is located at the connection of the other diodes, the second electrodes and measuring resistor, and diodes are formed by source-drain diodes of a first and second field-effect transistors, and a control apparatus actuates gates of the first and second field-effect transistors via a control voltage, and a measuring apparatus measures a measuring voltage at the measuring resistor that is proportional to the current.

Disclosed herein is a contactless DC electric-field sensor having improved sensitivity. The contactless DC electric-field sensor has a circuit composed of a variable capacitor and an RF generator and improves sensitivity through resonance of the circuit by connecting an inductor to the sensor.

The invention provides a passive direct-current voltage sensor which is powered by a tested direct-current high voltage and comprises a voltage division circuit, an input end of which is coupled with the tested direct-current high voltage and is used for converting the direct-current high voltage into a low-voltage signal in proportion; the equivalent resistance value of the non-linear correction circuit is reduced along with the reduction of the voltage at the two ends, and the non-linear correction circuit is used for compensating the overall equivalent input impedance of the voltage division circuit and the modulation circuit during small voltage input; the load compensation circuit is used for compensating the subsequent modulation circuit when the load changes and stabilizing the output voltage; the modulation circuit is used for linearly converting a signal of the load compensation circuit into an alternating current signal and is internally provided with a high-frequency transformer for realizing electrical isolation; the demodulation filter circuit is used for rectifying and filtering the alternating-current signal into a direct-current low-voltage output signal which is in fixed proportion to the detected direct-current high voltage; and heat-conducting insulating glue is filled between the radiator and the divider resistor and is used for enhancing heat dissipation and insulation. The technical problems that accurate monitoring of weak voltage changes is not enough, and the space occupation amount of the voltage division circuit is large are solved.

Circuit arrangement for current measurement in a conductor (L) carrying a current (I), wherein a current transformer (CT) is configured to generate an input voltage (U) from the current (I) in the conductor (L), which is supplied to the input (B1, B2) of a diode bridge circuit (B), and a first output (B3) of the diode bridge circuit (B) is located at the junction of two identical first electrodes (E1, E2) of the diodes (D1, D2) of the diode bridge circuit (B), wherein a measuring resistor (R) for current measurement is inserted between the two identical second electrodes (E3, E4) of the diodes (D3, D4) of the diode bridge circuit (B), a second output (B4) of the diode bridge circuit (B) is located at the junction of one of the diodes (D3, D4) with the second electrodes (E3, E4) and the measuring resistor (R), and a extended bridge junction (B5) at the connection of the other diodes (D3, D4) with the second electrodes (E3,E4) and the measuring resistor (R), and that diode (D4) of the diode bridge circuit (B), which is located at the second output (B4), is formed by the source-drain diode of a first self-blocking field-effect transistor (T1), and that diode (D3) of the diode bridge circuit (B), which is located at the extended bridge node (B5), is formed by the source-drain diode of a second self-blocking field-effect transistor (T2), and a control device (CU) is provided to drive the gate (G1) of the first field-effect transistor (T1) and the gate (G2) of the second field-effect transistor (T2) by means of the same control voltage, and a measuring device (MU) is provided to measure a measuring voltage across the measuring resistor (R), which is proportional to the current (I) in the conductor (L).

An electricity meter (2) for measuring one or more properties (4) of an electrical input (6) associated with a power supply, comprises a first analogue-to-digital converter (ADC) (10a), a second ADC (10b) and a processing resource (12). The first ADC (10a) is configured to receive an ADC input signal (18) which is representative of the electrical input and to generate, from the ADC input signal (18), a first ADC output data sequence (20a) which is representative of the electrical input during a time period. The second ADC (10b) is configured to receive the ADC input signal (18) which is representative of the electrical input and to generate, from the ADC input signal (18), a second ADC output data sequence (20b) which is representative of the electrical input during the time period. The processing resource (12) is configured to determine a cross-correlated average data sequence (40) corresponding to the time period based on the first and second ADC output data sequences (20a, 20b) and to determine the one or more properties (4) of the electrical input (6) during the time period based on the cross-correlated average data sequence (40) corresponding to the time period.

A control system for controlling a heater includes a controller configured to select a state model control, as an operation state of the heater, from among a plurality of state model controls, wherein each of the plurality of state model controls comprises one or more operation settings for controlling the heater for the respective state model control, the one or more operation settings comprises a transition condition that causes a transition from the operational state to one other state model control. The controller is configured to control a power supplied to the heater based on the operation state of the heater and a measured electrical characteristic of the heater, wherein the measured electrical characteristic includes at least one of an electric current and a voltage.

An apparatus including a first AC-to-DC converter, a first DC-to-AC converter and a second AC-to-DC converter, the first AC-to-DC converter connected with a low voltage arm of a high voltage divider to obtain a voltage measurement signal, the first DC-to-AC converter configured to output a modulated signal of the voltage measurement signal, the second AC-to-DC converter configured to output a demodulated signal of the voltage measurement signal; a high-frequency transformer including a primary coil connected with an output terminal end of the first DC-to-AC converter and a secondary coil connected with an input terminal of the second AC-to-DC converter; and a controller configured to control switching devices of the first DC-to-AC converter to control a turn-on sequence of each switching device, to calculate signal parameters, and to output the calculated signal parameters.

The present disclosure generally describes a method and system for converting power to operate a load being supplied by line power having a line energy. The method includes rectifying the line power, bucking the rectified line power to generate a desired voltage output such that current is drawn from the line power in phase with the desired voltage output, and bypassing switching energy created during the bucking of the rectified line power.

The present invention relates to a measured waveform phase control device and method of a merging unit (MU) which obtains an accurate value at a sampling command time, corrects characteristics of a change in temperature of an oscillator element, and also corrects delay characteristics of an analog sensing element at the sampling command time. A measured waveform phase control device of an MU of the present invention includes a temperature sensor which provides ambient temperature information, an oscillator element which provides an oscillation signal, an analog-digital converter (ADC) which samples an analog current sensing signal or voltage sensing signal as a digital signal, and a sampling clock providing part which provides a sampling clock to the ADC on the basis of the ambient temperature information and the oscillation signal under control of a sampling request part.

The application relates to a direct current measurement algorithm in a rectifier inverter device, and belongs to the field of power electronic converters. The method for measuring direct current in a rectifier inverter device provided by the application collects an alternating current waveform through an alternating current transformer, performs fitting calculation on the direct current by using the current waveform, and obtains the waveform of the direct current. The method does not need to use an additional direct current measurement device, only needs to measure alternating current through a commonly used alternating current transformer, processes and calculates the real-time measured alternating current through an algorithm in software, and the direct current can be calculated, at this time, the calculated direct current is a real-time value and is consistent with the actual direct current in real time.

We provide vehicle charging equipment. [Solution] The vehicle charging device includes an amplitude detection unit that detects the amplitude of the input grid voltage, a frequency detection unit that detects the frequency of the grid voltage, a PLL (Phase Locked Loop) unit that monitors the phase of the grid voltage, and a gain selection unit that inputs a coefficient calculated using the amplitude and frequency of the grid voltage to the PLL unit, wherein the amplitude detection unit and the frequency detection unit detect multiple points where the state of the grid voltage changes.

A biological sensor according to an embodiment of the present technology includes a first antenna conductor, a second antenna conductor, and a power detection unit. The second antenna conductor is a conductor different from the first antenna conductor, and is electrically coupled to an organism connected to an earth ground directly or by capacitive coupling. The power detection unit detects AC power to be generated between the first antenna conductor and the second antenna conductor in accordance with a resistance component of the organism relative to the earth ground.

A method for determining output currents of a rectifier stage and / or mains-side currents (iu, iv, iw) of a frequency converter (1) with a passive rectifier stage (3), an inverter (4), a DC link with an DC link inductor (Ldc) and an DC link capacitor (Cdc) between the rectifier stage (3) and the inverter stage (4) is described. In a frequency converter, the current information for the mains-side currents (iu, iv, iw) should be obtained without a current sensor on the mains side (2). For this purpose, the method includes the step of calculating a current in the DC link (5) using at least one voltage value (Urec) and characteristics of the rectifier (3) in the DC link (5) and / or mains-side currents to form a corrected current using the calculated current and a measured current or currents or a fraction of a measured current or currents.

Circuit arrangement for current measurement, wherein a current transformer is arranged to generate an input voltage from a current in a conductor, which is delivered to an input, and a first output is located at the connection of two identical first electrodes of a diode, a measuring resistor is inserted between two identical second electrodes of the diode, a second output is located at the connection of one of the diodes with the second electrodes and the measuring resistor, an extension bridge node is located at the connection of the other of the diodes and the measuring resistor, the diode at the second output is formed by the source-drain diode of a first self-blocking field effect transistor, the diode at the extension bridge node is formed by the source-drain diode of a second self-blocking field effect transistor, a control device drives the gate of the first field effect transistor and the gate of the second field effect transistor by identical control voltages, respectively, and a measuring device measures a measuring voltage across the measuring resistor, which is proportional to the current in the conductor.

A rectifier includes a first transistor of a drain / source common field effect type and a second transistor of a drain / source common field effect type in which the second transistor is diode-connected to the first transistor so as to allow the first transistor to perform a diode operation, and configures a rectifier stage with the first transistor.

A method includes selecting a state model control, as an operational state of the heater, from among a plurality of state model controls, measuring an electrical characteristic of the heater, where the electrical characteristic includes at least one of an electric current and a voltage, and controlling power to the heater based on the selected operational state and based on the measured electrical characteristic.

A cell management module for a power supply module including a plurality of power cells includes at least one cell-sensing circuit and a current measurement circuit connected to the at least one cell-sensing circuit. The at least one cell-sensing circuit includes a transformer having a first winding and a second winding inductively coupled to the first winding. A first sub-circuit of the cell-sensing circuit includes the first winding of the transformer and is operable to selectively pulse a first signal through the first winding. A second sub-circuit of the cell-sensing circuit includes the second winding of the transformer and one of the power cells of the power supply module. The current measurement circuit is connected to the first sub-circuit of the at least one cell-sensing circuit and infers a voltage of the power cell based on a measured current of the first signal.

A biosensor according to an embodiment of the present technology includes a first antenna conductor, a second antenna conductor, and a power detection unit. The second antenna conductor is a different conductor than the first antenna conductor and is electrically coupled to an organism connected to earth ground directly or by capacitive coupling. The power detection unit detects AC power generated between the first antenna conductor and the second antenna conductor in accordance with a resistance component of the living body with respect to earth ground.

To provide a display device for detecting damage of a pogo pin for electrical connection between a head and a stand, and to provide an operation method thereof.SOLUTION: According to an aspect of an exemplary embodiment, there is provided a display apparatus including a stand and a head, wherein the head is electrically connected through a pogo pin provided in a connector of the stand, and the head further includes a main board configured to acquire an operation state of the head and an input voltage input to the head through the pogo pin and determine whether an error occurs in the pogo pin based on the operation state of the head and the input voltage.SELECTED DRAWING: Figure 7

The invention provides a display device and an operation method thereof. The display device may include: a bracket; the head part is supported by the bracket and is provided with a display and a battery; the head part is electrically fastened with the bracket through a spring needle arranged on a connector of the bracket; the head portion can further comprise a main board, the main board obtains the action state of the head portion and input voltage input to the head portion through the spring needle, and whether the spring needle breaks down or not is judged based on the action state of the head portion and the input voltage.

The disclosure relates to accurately determining a DC energy signal, such as a DC current or DC voltage, which may be particularly useful when controlling a formation / testing current of a battery cell during formation and / or testing. In the battery formation / testing context, a current sensor is used to measure the current of the battery cell, which is used as a feedback signal for controlling the current to achieve a target current. The transfer function of the current sensor is used to improve the accuracy of the current measurement. Because the transfer function can be regularly determined during formation / testing, a lower-cost current sensor with relatively poor temperature coefficient may be used. Any change in the gain of the current sensor may be detected by the transfer function determination and corrected for. Therefore, high current control accuracy may be achieved at lower cost.

A device (20) for measuring a high voltage on a high voltage node, the power electronic converter comprising a first AC-DC converter (21), a first DC-AC converter (22) and a second AC-DC converter (23), the first AC-DC converter being connected to a low voltage arm of a high voltage divider coupled between the high voltage node and the device to obtain a voltage measurement signal, the first DC-AC converter being configured to output a modulated signal of the voltage measurement signal and the second AC-DC converter being configured to output a demodulated signal of the voltage measurement signal; an apparatus comprising: a high frequency transformer (24) having a primary coil connected to an output terminal of the DC-AC converter to receive the modulated signal, and a secondary coil connected to an input terminal of the second AC-DC converter; and a controller (25) configured to provide control signals to control switching elements of the first DC-AC converter to control a turn-on sequence of each switching element such that the first DC-AC converter outputs the modulated signal, calculate signal parameters including phase information and amplitude information of a high voltage on the high voltage node, and output the calculated signal parameters.

To provide a display device for detecting damage of a pogo pin for electrical connection between a head and a stand, and to provide an operation method thereof.SOLUTION: According to an aspect of an exemplary embodiment, there is provided a display apparatus including a stand and a head, wherein the head is electrically connected through a pogo pin provided in a connector of the stand, and the head further includes a main board configured to acquire an operation state of the head and an input voltage input to the head through the pogo pin and determine whether an error occurs in the pogo pin based on the operation state of the head and the input voltage.SELECTED DRAWING: Figure 7