38results about "Power measurement by pulse modulation" patented technology

An apparatus for and a method of measuring, in real-time, and indicating power consumption of a product powered by a switching mode power supply (SMPS). Power is supplied to the product through a transformer having a predetermined primary coil inductance, wherein a current of a primary coil of the transformer is turned ON and OFF by pulse-width modulation to supply the power to the electronic device. A drive voltage across the primary coil is monitored and a pulse waveform having a first level corresponding to an ON time of the current in the primary coil and a second level corresponding to an OFF time of the current in the primary coil is developed. Power consumption is calculated based on the drive voltage, the ON time of the current in the primary coil, the predetermined primary coil inductance, and a switching frequency of a pulse width modulator of the SMPS.

A control device and control method of power conversion unit applied to a three-phase AC grid. The control device includes detection unit, current detection unit, and signal processing unit. The detection unit detects three-phase voltage signal of the three-phase AC grid and calculates and generates negative sequence reactive current given signal. The current detection unit detects current of the power conversion unit to output feedback current signal. The signal processing unit receives the negative sequence reactive current given signal, positive sequence current given signal, and the feedback current signal to output modulation signal. The power conversion unit is electrically coupled to the signal processing unit and the three-phase AC grid. The power conversion unit absorbs negative sequence reactive currents from the three-phase AC grid according to the modulation signal when the three-phase voltage signal is unbalanced to reduce negative sequence voltage at output terminal of the power conversion unit.

An electronic energy meter includes a first sigma delta modulator having an electrically isolated digital data output. A power supply stage coupled to a first electrical line provides a supply voltage to the first sigma delta modulator. A shunt device is also coupled to the first electrical line. The first sigma delta modulator is coupled via an input to the shunt device for measuring a current through the first electrical line. The electrically isolated digital output is isolated by a capacitive isolation barrier.

An apparatus for and a method of measuring, in real-time, and indicating power consumption of a product powered by a switching mode power supply (SMPS). Power is supplied to the product through a transformer having a predetermined primary coil inductance, wherein a current of a primary coil of the transformer is turned ON and OFF by pulse-width modulation to supply the power to the electronic device. A drive voltage across the primary coil is monitored and a pulse waveform having a first level corresponding to an ON time of the current in the primary coil and a second level corresponding to an OFF time of the current in the primary coil is developed. Power consumption is calculated based on the drive voltage, the ON time of the current in the primary coil, the predetermined primary coil inductance, and a switching frequency of a pulse width modulator of the SMPS.

The invention discloses an electric power detection system. An integration circuit (35) charges a capacitor C1 by a charge current corresponding to a current flowing in a detection resistor R1 provided in an electric power supply path extending to a DCM (20). A comparison circuit (50) outputs a comparison signal Vo2, which changes to one of a high level and a low level in accordance with an integration value corresponding to a charge voltage of the capacitor C1. A discharge switch SW1 discharges the capacitor C1 and stops discharge of the capacitor C1, when the comparison signal is at the high level and the low level, respectively. A control circuit (70) determines an estimation value of electric power supplied from a battery (BAT1) to a DCM (20) based on a count of edges, at which the signal level of the detection signal changes.

The invention provides a 67GHz coaxial broadband peak power probe. The 67GHz coaxial broadband peak power probe comprises a detecting circuit and a post-detection video processing circuit, wherein the detecting circuit is composed of a 1.85mm coaxial connector, a round gold foil, a corrugated pipe, a 3dB attenuator, a 50 ohm matching network, at least two resonance controlling resistors, at least two low barrier schottky diodes, at least two video filter capacitors and at least one positive coefficient thermistor, and the detecting circuit is used for filtering out carrier waves of pulse modulation signals to obtain envelope signals of the pulse modulation signals. By means of the scheme, achieved typical indexes include that carrier signal frequency range is 500MHz to 67GHz; the peak power dynamic range is (-20) dBm to 20dBm; the pulse rise time is <= 5ns; the input port standing-wave ratio is smaller than 1.6: 1, the post-detection video bandwidth is large, <= 5ns pulse rise / fall time can be measured, and the measurement of <= 5ns pulse rise / fall time is better than that of < 15ns pulse rise / fall time.

Each of connection data 11, . . . , or 15, of the downstream side of a socket 1, . . . , or 5 or a panel board 6, 7, or 8 in a power supply direction, is generated in a tap 16, a UPS 25 and 35, or a terminal 24 or 34, and each of the connection data is transmitted to a electrical system wiring diagram generating terminal 36. Then, a wiring diagram is generated, based on connecting information 91 of the upstream side, which is registered in the generating terminal 36, and the plural connection data of the downstream sides.

The invention provides a power unit test system, which tests a power unit under test by setting an electronic load device. Compared with the related art in which multiple power units need to be assembled into a frequency converter for testing, the power unit test system is simple in test operation and can test a single power unit by the electronic load device without assembling multiple power units into a frequency converter, even if the test result of the power unit is not qualified, the frequency converter can be simply assembled without using the power unit, the defect that the entire frequency converter cannot be used if one power unit fails the test is avoided, and the test cost is greatly reduced.

An electronic energy meter includes a first sigma delta modulator having an electrically isolated digital data output. A power supply stage coupled to a first electrical line provides a supply voltage to the first sigma delta modulator. A shunt device is also coupled to the first electrical line. The first sigma delta modulator is coupled via an input to the shunt device for measuring a current through the first electrical line. The electrically isolated digital output is isolated by a capacitive isolation barrier.

The invention provides a method for testing the impulsive load for a diesel engine, which comprises: regulating the rotation speed of the diesel engine to an acquired target rotation speed; acquiring the impulse width of an impulse modulation signal according to the acquired target output power of the diesel engine; controlling the exciting current of the diesel engine by using the impulse modulation signal with the impulse width; and measuring the output power of the diesel engine. The invention also provides a device for testing the impulsive load of the diesel engine. When the method and the device for testing the impulsive load of the diesel engine, which are provided by the invention, are used, the corresponding impulse width is determined according to the target output power, the impulse modulation signal with the impulse width is used to control the exciting current of the diesel engine, and thus, the step control over the exciting current is realized through stepwise regulating impulse width and consequently the step control over the output power of the diesel engine is realized.

An electrical activity sensor device for monitoring the electrical status of an electrical device, the device comprising: a power cable for supplying power to an electrical device from a power supply network, the power cable being fitted with an in-line switch enabling the electrical device to be switched between electrical power states; wherein: the antenna element is operable to transfer the identification data to the power cable; and the power cable is operable to operate as an antenna when the electrical device is switched on to transmit identification data wirelessly from a sensor device attached to the cable to a reader device.

An energy consumption monitor for use in an electronic system comprising an integrated circuit such as a microcontroller. The monitor comprises a counter adapted to accumulate pulses developed by a charge source, each pulse indicative of the delivery of one unit of charge to a load circuit. A monitoring facility monitors the counter to develop an energy consumption record over time.

The invention discloses a power frequency electrical parameter extraction method and system and a computer readable storage medium. The power frequency electrical parameter extraction method comprisesthe following steps of acquiring phase information of a three-phase voltage signal, a three-phase current signal and a three-phase voltage on a natural coordinate system of an ultrahigh-voltage DC inversion end AC line at commutation failure moment; converting the three-phase voltage signal and the three-phase current signal on the natural coordinate system to a dq0 coordinate system by a synchronous rotation coordination change method so as to obtain a voltage component and a current component corresponding to each phase on a d axis and a q axis; and obtaining a DC component corresponding toeach phase on the d axis and the q axis, and calculating an apparent power, an active power and a reactive power corresponding to each phase according to the DC component corresponding to each phaseon the d axis and the q axis. By the method, a power frequency component is conveniently and rapidly extracted when commutation is in failure.

A control device and control method of power conversion unit applied to a three-phase AC grid. The control device includes detection unit, current detection unit, and signal processing unit. The detection unit detects three-phase voltage signal of the three-phase AC grid and calculates and generates negative sequence reactive current given signal. The current detection unit detects current of the power conversion unit to output feedback current signal. The signal processing unit receives the negative sequence reactive current given signal, positive sequence current given signal, and the feedback current signal to output modulation signal. The power conversion unit is electrically coupled to the signal processing unit and the three-phase AC grid. The power conversion unit absorbs negative sequence reactive currents from the three-phase AC grid according to the modulation signal when the three-phase voltage signal is unbalanced to reduce negative sequence voltage at output terminal of the power conversion unit.

A power measurement device for sampling current or voltage signals of a power system to produce a 1-bit delta-sigma bitstream. The power measurement device includes a frequency locked loop for determining the power system frequency directly from the -bit delta-sigma bitstream. The frequency locked loop includes a 1-bit rotate CORDIC that is configured to produce difference signals having a multi-bit word for each bit of the 1-bit delta-sigma bitstream, and a phase error calculator that determines the difference between the phase of the power system frequency and a phase ramp generated from a frequency measurement value in a frequency register. The phase error calculator feeds back a phase correction signal to the frequency register to lock the frequency measurement value to the power system frequency.

The invention belongs to the technical field of electricity, and particularly relates to an integrated low-voltage line intelligent monitoring device. The integrated low-voltage line intelligent monitoring device comprises an opening measurement current sensor, an opening protection current sensor, a voltage sensor, a temperature sensor, a power supply unit, an intelligent monitoring unit and a communication unit. A measurement current signal acquired by the opening measurement current sensor is transmitted to the intelligent monitoring unit, a protection current signal acquired by the openingprotection current sensor is transmitted to the intelligent monitoring unit, a voltage signal acquired by the voltage sensor is transmitted to the intelligent monitoring unit, and a line temperaturesignal acquired by the temperature sensor is transmitted to the intelligent monitoring unit. The communication unit is connected with the intelligent monitoring unit. The power supply unit provides aworking power supply for the intelligent monitoring unit and the communication unit. According to the technical scheme, the problem on how to realize miniaturization and flexible monitoring of a low-voltage line is solved.

A signal generation device and a signal generation method may measure leakage currents, such as an input current value I and phase-shifted current values I cos θ and I sin θ in a short period of time and automatically output the detected values without calculating a vector of a phase difference. The signal generation device generates logical signals from a voltage waveform and a current waveform of a measured power line through first and second comparators, sets parameters, full-wave rectifies the current waveform, and performs quantization transform on the full-wave rectified current waveform using a successive ΔΣADC.

A multiplier circuit, a corresponding device and a method are provided. A voltage-to-time converter circuit receives a first voltage signal and produces a PWM-modulated signal having a duty-cycle proportional to the first voltage signal. A current integrator circuit receives the PWM-modulated signal from the voltage-to-time converter circuit block and produces an output signal by integrating a current signal from a current source over integration time intervals having a duration which is a function of the duty-cycle of the PWM-modulated signal. The current signal is proportional to a second voltage signal. The output signal is accordingly proportional to a product of the first voltage signal and the current signal, which is furthermore proportional to a product of the first voltage signaland the second voltage signal.

A power detection and transmission circuit is provided. The power detection and transmission circuit includes a first conversion circuit, a second conversion circuit and a signal coupling circuit. The first conversion circuit is electrically connected to a power supply module to receive an analog input signal, and is arranged for converting the analog input signal to a first pulse width modulation (PWM) signal. The second conversion circuit is arranged for converting a second PWM signal to an analog regenerated signal, and transmitting the analog regenerated signal to a microcontroller, wherein the microcontroller calculates power information of the power supply module according to the analog regenerated signal. The signal coupling circuit is coupled between the first conversion circuit and the second conversion circuit, and is arranged for coupling the first PWM signal to the second conversion circuit and accordingly generating the second PWM signal.

The invention discloses a calculation method used for calculating the load power and the power consumption of a washing machine. The method comprises: step1, measuring motor input power and recordingas W0; step2, determining the load interval parameter of a washing machine load amount and recording as F; step3, determining a water level height interval parameter in the washing machine and recording as S; step4, setting the washing power coefficient of the washing machine to be C, a dehydration power coefficient to be K, the washing power of the washing machine to be Wt, and the dehydration power of the washing machine to be Wx so that the washing power of the motor is Wt=(F+S)*C+W0, and the dehydration power is Wx=K*Wth, wherein the Wth is the washing power at the end of the washing machine; and step5, calculating the power consumption of the washing machine to be sigma(Wt*ta)+ sigma(WX*tb). Through monitoring the power of the washing machine motor and the load of the washing machine,the load power and the power consumption are calculated, the different stages of washing machine operation are separately calculated, accumulation and displaying are performed according to time, andthe consumed power of the washing machine can be displayed in real time.

An integration circuit charges a capacitor by a charge current corresponding to a current flowing in a detection resistor provided in an electric power supply path extending to a DCM. A comparison circuit outputs a comparison signal, which changes to one of a high level and a low level in accordance with an integration value corresponding to a charge voltage of the capacitor. A discharge switch discharges the capacitor and stops discharge of the capacitor, when the comparison signal is at the high level and the low level, respectively. A control circuit determines an estimation value of electric power supplied from a battery to a DCM based on a count of edges, at which the signal level of the detection signal changes.

A signal adjustment device includes a frequency adjustment circuit, a filter circuit, and a power estimation circuit. The frequency adjustment circuit is configured to receive a two-tone signal from a signal generator and to generate a first signal according to the two-tone signal, wherein the signal generator generates the two-tone signal according to a first coefficient and a second coefficient. The filter circuit is configured to filter the first signal, in order to generate a second signal. The power estimation circuit is configured to detect a power of an intermodulation distortion from the third order signal component, which is associated with the two-tone signal, in the second signal, and to adjust at least one of the first coefficient and the second coefficient according to the power, in order to reduce the power.

An electronic monitoring circuit for detecting a variation in the power or current absorbed by an electronic circuit under test is disclosed. The circuit includes an input terminal adapted to receive a pulse-width modulation control signal, a resistor having a first terminal connected to the input terminal, and a capacitor having a first terminal connected to a second terminal of the resistor. The output terminal is adapted to generate an output signal as a function of the value of the voltage drop at the ends of the capacitor, said output signal being representative of a variation of the pulse width of the pulse-width modulation control signal. The variation of the pulse width is a function of the power or current absorbed by the electronic circuit under test.

The invention discloses a calculation method used for calculating the load power and the power consumption of a washing machine. The method comprises: step1, measuring motor input power and recordingas W0; step2, determining the load interval parameter of a washing machine load amount and recording as F; step3, determining a water level height interval parameter in the washing machine and recording as S; step4, setting the washing power coefficient of the washing machine to be C, a dehydration power coefficient to be K, the washing power of the washing machine to be Wt, and the dehydration power of the washing machine to be Wx so that the washing power of the motor is Wt=(F+S)*C+W0, and the dehydration power is Wx=K*Wth, wherein the Wth is the washing power at the end of the washing machine; and step5, calculating the power consumption of the washing machine to be sigma(Wt*ta)+ sigma(WX*tb). Through monitoring the power of the washing machine motor and the load of the washing machine,the load power and the power consumption are calculated, the different stages of washing machine operation are separately calculated, accumulation and displaying are performed according to time, andthe consumed power of the washing machine can be displayed in real time.

An electronic device includes an input power detection unit, a transmission control unit and a converter. The input power detection unit is configured to determine an input voltage value and an input current value of an input power. In response to the input power, the transmission control unit is configured to determine a first voltage value and a first current value associated with another electronic device via a handshake process. The voltage converter is configured to convert the input power, the first voltage value and the first current. A first power supply is provided and has the first voltage value and the first current value. The device is used for deal with the necessity of taking various voltage convertor or transformer in different specificities due to different charging requirement of different electronic apparatus in the prior art, and achieves power supply of determining a first maximum current as a first current value on the basis of the preset first voltage specficity, thus effectively completing power supply.

The invention discloses a method, system and computer-readable storage medium for extracting power frequency electrical parameters. The current signal and the phase information of the three-phase voltage; the three-phase voltage signal and three-phase current signal on the natural coordinate system are converted to the dq0 coordinate system based on the method of synchronous rotation coordinate change to obtain the voltage components corresponding to the d-axis and the q-axis of each phase, The current component; then obtain the DC component corresponding to the d-axis and the q-axis of each phase, and use the DC component corresponding to the d-axis and the q-axis of each phase to calculate the apparent power, active power, and reactive power of each corresponding phase. This method is convenient to quickly extract the power frequency component when the commutation fails.

There are provided an apparatus and a method for detecting a frequency, the apparatus including a signal converting unit removing a high frequency component from an input signal and then converting the input signal into a digital signal, an edge detecting unit detecting an edge of the digital to thereby generate an edge detection signal having a predetermined magnitude, and a frequency estimating unit generating a pulse signal based on the edge detection signal and averaging the pulse signal at a predetermined interval to thereby estimate a frequency of the input signal.

The invention provides a power signal detection circuit and method. The power signal detection circuit comprises a first conversion module configured to generate a pulse width modulation signal based on a first signal in an input voltage signal and an input current signal, the duty ratio of the pulse width modulation signal being linearly correlated with the size of the first signal; a second conversion module configured to generate a representation voltage signal based on a second signal in the input voltage signal and the input current signal, the size of the representation voltage signal being linearly related to the size of the second signal; and a low-pass filtering module configured to generate a voltage signal which is linearly related to an input power signal and is used for representing power based on the pulse width modulation signal and the representation voltage signal, the input power signal referring to a power signal generated by multiplying the input voltage signal and the input current signal.