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

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.

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.

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 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.

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 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.

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 is provided an energy consumption meter device comprising including a processor arranged to receive input data from the sampling unit. The processor calculates at a calculation step [n] an energy contribution value using ΔE using a sampled voltage value and a sampled current value. The processor will calculate an energy value E[n] using a reminder value which was calculated at a previous calculation step [n−1]. The processor will then calculate a relative delay Td′ using the threshold value, the reminder value and the energy value, and generate an output pulse at an output time tpulse which is delayed for the relative delay Td′ with respect to the calculation time step[n]. By delaying the output pulse with a value which is a closest proximity of Td, the cycle-by-cycle jitter is less or equal to the clock frequency of the timer tclk.

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.