14results about "Direction of current indication" patented technology

A flux switch system is disclosed. The system (50) includes an input stage (52) configured to provide an interrogation pulse. The system also includes a plurality of flux loops (62, 64) configured to receive an input current (IIN). Each of the flux loops includes a Josephson junction (J1, J2) configured to trigger to generate an output pulse in response to a first polarity of the input current and to not trigger to generate no output pulse in response to a second polarity of the input current opposite the first polarity. The system further includes an output stage (54) configured to propagate the output pulse to an output (INTout) of the flux switch system.

The application discloses a voltage acquisition circuit, a bipolar direct-current power supply and a voltage acquisition method. A voltage difference between a near-end voltage and a far-end voltage is calculated by a subtracter. First, second and third switch switching units combine the positive and negative states of a power supply output voltage to switch the connection relationship between the voltage difference output by a positive voltage compensation voltage unit, a negative voltage compensation voltage unit and the subtracter and two input ends of a comparator. When a positive voltage is output, the positive voltage compensation voltage unit is connected to the inverting input end of the comparator, and the output end of the subtracter is connected to the non-inverting input end of the comparator; when a negative voltage is output by the power supply, the negative voltage compensation voltage unit is connected to the non-inverting input end of the comparator, and the output end of the subtracter is connected to the inverting input end of the comparator. A control unit determines whether far-end sensing sampling is normal according to the high and low levels of an abnormal comparison voltage output by the comparator. The application can identify the situations of disconnection and reverse connection when the bipolar direct-current power supply outputs a negative voltage.

This application relates to the field of generator testing technology, and particularly to a method, apparatus, and equipment for determining the power direction of a generator's current transformer. The method includes: short-circuiting the target side of a transformer to construct a short-circuit closed loop, wherein the short-circuit closed loop includes a generator, a current transformer, and a transformer, and a waveform recorder is connected to the loop; injecting current into the short-circuit closed loop through a zero-start current from the generator until the generator terminal current rises to a first target current; using the waveform recorder to acquire the secondary voltage at the generator terminals and the secondary current of the current transformer, calculating the actual reactive power at the generator terminals based on the secondary voltage and secondary current; and determining the power direction of the generator's current transformer based on the reference reactive power and the actual reactive power at the generator terminals. This solves the problem that the power direction of the generator's current transformer secondary current and terminal secondary voltage, as well as the limitation of impedance components, can only be tested and verified after grid connection.

The application discloses a kind of open-winding photovoltaic energy storage converter system fault diagnosis method, device, equipment and storage medium, it is related to power electronic converter fault diagnosis technical field, the method comprises: obtaining the photovoltaic side DC bus current, energy storage side DC bus current and three-phase AC output current of open-winding photovoltaic energy storage converter system;According to three-phase AC output current, photovoltaic side DC bus current, energy storage side DC bus current obtains the current residual of photovoltaic side fault phase and the current residual of energy storage side fault phase;The current residual of photovoltaic side fault phase and the current residual of energy storage side fault phase are processed, and first diagnostic variable and second diagnostic variable are obtained;Detect the current flow direction of fault phase in open-winding photovoltaic energy storage converter system;According to the current flow direction of fault phase, first diagnostic variable and second diagnostic variable, determine fault location.The method can realize accurate fault positioning of open-winding photovoltaic energy storage converter system.

The present application relates to the technical field of power generation motor, and discloses a power generation motor insulation state prediction method and system. The method collects three-phase stator current signals and operation mode identification signals of the power generation motor, and constructs an insulation degradation characteristic vector. The power generation mode and the motor mode are distinguished based on window average active power, and an operation mode variable and a mode change indicator are constructed. The basic coupling coefficient between the degradation characteristics is calculated, the coupling weight is adjusted by introducing a mode sensitivity function, an adaptive adjacency matrix driven by the operation mode is constructed, and the event-driven update of the graph structure is realized. Based on the adaptive graph structure, spatial feature extraction and time dimension fusion are carried out, and a normalized insulation health index is output for state evaluation and trend analysis. The method can weaken the influence of the difference between the two working conditions on the coupling relationship of the characteristics, improve the stability and reliability of the insulation degradation evaluation, and is suitable for online monitoring and early warning of the power generation motor of the pumped storage unit.

An artificial nociceptor may include a sensor configured to convert a damaging force into electric energy, a conversion circuit configured to generate an input voltage having a form of a cycle signal having a frequency and amplitude changed, based on the electric energy, and a storage circuit including a plurality of memory cells and configured to provide the input voltage to first memory cells included in a selected area, among the plurality of memory cells.

An electrical apparatus forming part of an AC power supply network comprises a conductor, sensors for measuring current and voltage on the conductor and a control unit. The control unit receives, from the sensors, measurements of the current and the voltage at the conductor and calculates a phase angle between them. Whether a short circuit current is occurring in the conductor is determined and a set of predetermined phase angle ranges is selected depending on whether a fault is present. Which of the ranges contains the calculated phase angle is used to determine if the power flow is incoming or outgoing. First and second phase angle ranges are used when no short circuit fault is present; third and fourth ranges are used when a fault is present. The directions of power flow may be measured at different points in the network and the location of a fault determined as lying between two of these points.

An eco-friendly plasma cleaning system and method are disclosed. The plasma cleaning system comprises a remote plasma device. Here, a precursor having a global warming potential (GWP) of 10,000 or less and an oxygen-containing gas are introduced into the remote plasma device, plasma is generated using the precursor and the oxygen-containing gas in the remote plasma device, and the plasma or radicals corresponding thereto are supplied to a chamber connected to the remote plasma device, so as to clean the chamber.

The application discloses a current zero-crossing polarity determination device, a determination method and application thereof, and relates to the technical field of current polarity determination devices. The input end of the filter amplification module is connected with the phase line of a motor inverter, the output end of the filter amplification module is connected with the input end of a zero-crossing determination module, the output end of the zero-crossing determination module is connected with a single-chip microcomputer, the current sampling module comprises a reference voltage generating circuit and a current sampling circuit, the positive-phase input end of the current sampling circuit is connected with the phase current output end of an ADC current collector configured by the single-chip microcomputer, the output end of the reference voltage generating circuit is connected with the positive-phase input end of the current sampling circuit, the positive-phase input end and the inverting input end of the current polarity determination module are both connected with the output end of the current sampling circuit, and the output end of the current polarity determination module is connected with the single-chip microcomputer.

The application provides a kind of active bidirectional current detection circuit and detection method based on magnetic isolation, it is related to current detection technical field, circuit includes: power switch tube Q1, current transformer T1, reset resistance R1, active sampling switch tube Q2 and current sampling resistance R2;The primary winding of the current transformer T1 is connected in the power circuit to be measured, and one end of the current transformer T1 is connected with the source of the power switch tube Q1;The reset resistance R1 is connected in parallel to the two ends of the secondary winding of the current transformer T1;The active sampling switch tube Q2 is connected in parallel to the two ends of the secondary winding of the current transformer T1 after being connected with the current sampling resistance R2, to constitute the secondary low impedance sampling branch.The detection circuit of the application can avoid the reset abnormality and sampling waveform distortion caused by the blocking of unidirectional diode in synchronous rectification scene, and realize accurate and reliable detection of power MOS tube drain-source bidirectional current.

The utility model discloses a reverse flow detection circuit and a power supply device, which are used for meeting the reverse flow fault detection requirement of equipment in a high-power power supply scene and reducing the cost of the reverse flow detection device. The backward flow detection circuit comprises a mutual inductor, an impedance module and an amplifier. A primary winding of the mutual inductor is used for being connected with a to-be-tested branch, and a secondary winding of the mutual inductor is connected with the impedance module; the impedance module is connected with the processing device through the amplifier; and the amplifier is used for amplifying the electrical parameters output by the impedance module and then outputting the electrical parameters to the processing device, so that the processing device performs backward flow fault detection according to the electrical parameters output by the amplifier. As the impedance module used for limiting the current is additionally arranged on the secondary side of the mutual inductor, when the reverse irrigation detection circuit is applied to a high-power power supply scene, the amplitude of the secondary current output by the mutual inductor can also be limited within a small range, and safe operation of a rear-end connecting device is ensured.

Systems and methods for identifying wafer voltage from inflection points are described. One of the methods includes receiving a voltage waveform measured at an output of the nonsinusoidal bias power supply coupled to a plasma chamber in which a substrate is processed. The method includes determining a plurality of inflection points from the voltage waveform. At each of the plurality of inflection points, a change in plasma impedance occurs. The method includes identifying, from the plurality of inflection points, that a wafer voltage at the substrate becomes positive from negative and becomes negative from positive and controlling the nonsinusoidal bias supply based on the wafer voltage.

The present application discloses a pot detection circuit and method, a power control circuit and method, and a wireless heating apparatus. The pot detection circuit comprises a direction detection module, a voltage detection module, and a control module. The control module is connected to the direction detection module and the voltage detection module, and is used to determine a voltage amplitude of a first capacitor according to a direction signal corresponding to a current direction flowing through a first resistor inputted by the direction detection module and a voltage signal corresponding to a capacitance voltage of the first capacitor inputted by the voltage detection module, and determine, according to a comparison result between the voltage amplitude and a preset amplitude, whether the wireless heating apparatus carries a pot. By means of obtaining an actual voltage amplitude of the first capacitor connected in series with a coil and determining, on the basis of the comparison result between the voltage amplitude and the preset amplitude, whether the wireless heating apparatus carries a pot, interference from an external magnetic field on a circuit in the wireless heating apparatus can be avoided, thereby making a detection result of the pot more accurate.

The application belongs to the technical field of power electronic equipment state monitoring, and particularly discloses an MMC capacitor parameter estimation method and system based on an extended input window, which comprises the following steps: defining the time period when all sub-modules in a bridge arm are simultaneously put into operation as an input window, and detecting the input number of the sub-modules in each bridge arm of the MMC in real time; when the input number of the sub-modules is equal to the number of the continuous control periods of the total number of the sub-modules in the bridge arm and exceeds a preset delay factor threshold, determining the start and end times of the input window according to the start time and the end time when the input number of the sub-modules is equal to the total number of the sub-modules in the bridge arm; monitoring the bridge arm current direction in real time, and calculating the capacitor voltage increment of each sub-module according to whether effective current commutation occurs in the input window; and estimating the capacitor parameters of each sub-module based on the capacitor voltage increment. The application moves the start point of the input window to the first full input time, so that the voltage change information in the initial stage of the window can be fully utilized.