58results about "Measurement using ac-dc conversion" patented technology

The utility model discloses an expansion power supply to adapt to a multipath BDU voltage sampling circuit, comprising a flyback unit used for obtaining an alternating current, converting the alternating current into a direct current power supply and outputting the direct current power supply; the voltage adjusting unit is used for filtering and stabilizing the output direct-current voltage and then outputting a direct-current power supply; and the DCDC power supply unit is used for obtaining an output DC power supply for power supply. According to the expansion power supply, the area of a single PCB (Printed Circuit Board) and the volume of a transformer are effectively reduced by adapting to a multi-path BDU voltage sampling circuit, meanwhile, the use amount of devices is reduced, and the problem that multi-path negative sampling needs a plurality of non-common-ground power supplies is solved in a low-cost manner.

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.

The invention provides an air conditioner which comprises an alternating current input circuit used for outputting a power supply signal; the photoelectric coupling circuit is used for transmitting or isolating a power supply signal; the zero-cross detection circuit is used for receiving the power source signal and the preset power source signal and determining a plurality of corrected zero-cross signals according to the power source signal and the preset power source signal, errors of original zero-cross signals can be made up, the accurate zero-cross detection function of the zero-cross detection circuit is achieved, more accurate zero-cross reference is provided for the air conditioner, and the air conditioner is more accurate in zero-cross detection. It is ensured that follow-up control over loads such as a fan of the air conditioner is highly synchronous with the power cycle, and the control precision and the equipment operation stability are improved.

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.

The embodiment of the utility model provides an isolation detection circuit and a vehicle-mounted charger. The isolation detection circuit comprises a first voltage sampling module, a second voltage sampling module, a first isolation conversion module, a second isolation conversion module, a first signal conditioning module and a second signal conditioning module. The first sampling end of the first voltage sampling module is connected with the first end of the charging port connector, the second sampling end of the first voltage sampling module is connected with the second end of the charging port connector, and the output end of the first voltage sampling module is connected with the input end of the first isolation conversion module. The output end of the first isolation conversion module is connected with the input end of the first signal conditioning module, and the output end of the first signal conditioning module is connected with the first control module. And the voltage at the two ends of the charging port connector can be accurately and reliably detected.

(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 are a power level acquisition circuit and apparatus, used for solving the problem in the prior art, when conducting reinforced insulation testing, of work hour wastage and safety hazards. A power acquisition circuit comprises an AC-DC conversion unit (20), an acquisition unit (21), a processing unit (22), a power supply isolation unit (23), and a communication isolation unit (24); the power supply isolation unit (23) isolates the current between the power supply side of the acquisition unit (21) and the power supply side of the processing unit (22), and the communication isolation unit (24) isolates the current when the communication end of the acquisition unit (21) and the communication end of the processing unit (22) are in communication; because of the presence of the power isolation unit (23) and the communication isolation unit (24), no large current occurs on the sampling unit (21) side, eliminating the need to disconnect the sampling terminal for enhanced insulation testing, saving work hours, and reducing safety hazards.

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.

A control system includes a power converter being a step-down voltage converter and including a power switch. The power converter is operable to generate an adjustable output voltage and includes a sensor circuit configured to measure at least one of a voltage and an electric current of the heater. The control system includes a controller connected to the power converter and the sensor circuit. The controller is configured to determine an input parameter based on the at least one of the voltage and the electric current. The input parameter is indicative of a temperature of the heater. The controller is configured to set the output voltage applied for the heater based on the input parameter and a desired setpoint. The desired setpoint is based on an operational state of the heater. The controller is configured to operate the power switch of the power converter to generate the output voltage.

Provided is 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 present invention relates to a system including a multifunctional DC power quality (PQ) meter, and an operation method thereof, the system comprising: the PQ meter; and a manager terminal, in particular, wherein the PQ meter includes: a first signal generation circuit that includes a current transformer and a voltage transformer, which are connected to both ends of an alternate current (AC) wire disposed at one end of AC / DC power converter, and applies first signals in connection with AC current and AC voltage, respectively, from the current transformer and voltage transformer; a second signal generation circuit that is connected to a DC wire disposed at the other end of the AC / DC power converter and applies second signals in connection with DC voltage and DC current, respectively, from the DC wire; a communication circuit; and a control circuit that generates PQ data based on applied signal, when at least one among the first and second signals is applied, and then transports the PQ data to the manager terminal at a constant cycle.

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).

A cordless vacuum cleaner includes a cleaner main body and a station. The cleaner main body includes a battery and a first processor controlling performing a cleaning function using power of the battery. The station includes a power conversion device to generate a voltage to charge the battery of the cleaner main body, a second charge terminal to charge the battery of the cleaner main body with the voltage generated by the power conversion device, a temperature sensor installed within a distance from the second charge terminal and to detect a temperature of the second charge terminal, a divider resistor to provide a voltage by dividing of an input voltage with the temperature sensor, and a second processor controlling performing an overheating prevention operation based on a voltage level of the voltage provided by the divider resistor and the temperature sensor being greater than a threshold voltage level.

A control system for controlling an adjustable output voltage provided to a heater includes a controller configured to determine an input parameter based on an electrical characteristic of the heater, where the heater includes a resistive heating element that is operable to emit heat and as a sensor. The controller is further configured to determine an output voltage for the heater based on the input parameter and a desired setpoint, and to transmit a signal to a power converter to generate the output voltage. The desired setpoint is based on an operational state of the heater, and the input parameter includes data indicative of a temperature of the resistive heating element that is determined based on the electrical characteristic.

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.

The invention belongs to the technical field of electrical equipment performance detection, and particularly relates to a multi-switching-value signal synchronous acquisition and linear conditioning method and system. Comprising a switching value detection circuit, a controller and a digital-to-analog conversion circuit. The controller adopts a single chip microcomputer to detect the switching value state output by the multi-path switching value detection circuit, the controller outputs a control signal to control an output voltage signal of the digital-to-analog conversion circuit according to the detected switching value signal state, and the output voltage signal of the digital-to-analog conversion circuit corresponds to the signal state of the input switching value group; the controller also outputs a PWM pulse signal to drive the switching value detection circuit to work; and the switching value loop collects a switching value signal of the tested equipment. The system has the advantages that multiple paths of switching value signals can be synchronously acquired, and the logic relation between the real-time state of multiple paths of switching values and the switching values is mastered; collected switching value signals can be compatible with dry nodes and wet nodes, the wet nodes can be compatible with alternating-current and direct-current voltages, and off-line and on-line detection requirements are met.

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 utility model discloses a pressure equalizing test device for a high-pressure valve group. The pressure equalizing test device comprises a low-pressure test unit and a high-pressure suspension high-pressure test unit, wherein the low-voltage test unit comprises a computer terminal and a controller connected with the computer terminal; the high-voltage test unit comprises a valve group, a probe and an oscilloscope which are connected in sequence; the computer terminal is connected with the oscilloscope, and the controller is connected with the valve group. According to the utility model, the high-voltage breakdown phenomenon can be avoided, so that the safety risk of voltage-sharing testing in a high-voltage environment is reduced, and the convenience and safety of testing are improved.

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.

A system and method for determining current and efficiency are provided. A current measurement circuit includes a plurality of precision current measurement devices. Each of the precision current measurement devices has a respective operating range and is configured to be coupled to a voltage converter via a second input power. A switch circuit includes a plurality of switches. One end of each of the plurality of switches is connected to a respective one of the plurality of precision current measurement devices and an other end of each of the plurality of switches is connected to a first input power. A controller is electrically coupled to the current measurement circuit and the switch circuit. The controller is configured to selectively close the plurality of switches to place a subset of the plurality of precision current measurement devices in an active mode such that each of the subset of the plurality of precision current measurement devices is within the respective operating range and to determine a total current at the second input power.

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.

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.