An apparatus includes a plurality of switches connected in parallel between an input terminal and an output terminal of a power bus, a plurality of current sensing circuits coupled to the plurality of switches, wherein each current sensing circuit is coupled to a corresponding switch, and a plurality of current sharing circuits configured to receive current sensing signals from the plurality of current sensing circuits and generate a plurality of gate drive signals to control the plurality of switches so as to achieve a predetermined current distribution among the plurality of switches.

In a meter for performing a measurement of an electrical parameter, an output from a sensor is sampled to produce at least one sample, and an iterative method is performed comprising: producing further samples; holding in memory a stored array of samples comprising the at least one sample and each of the further samples from each iteration; determining a measure of statistical variability of a mean for the respective iteration from a measure of statistical variability and from the number of samples used to generate the measure of statistical variability; comparing the measure of statistical variability of the mean with a pre-determined threshold; and generating an electrical signal indicating a state of the measurement if the measure of statistical variability of the mean of the samples taken during the measurement is less than or equal to the pre-determined threshold.

A controller circuit is configured to receive, from a first device, a first node voltage measured at a first node by the first device at a first time when a first current flows between the first node and a second node and receive, from a second device, a second node voltage measured at a second node by the second device at a second time when a second current flows between the first node and the second node, wherein the first time is different from the second time. The controller circuit is further configured to, responsive to a determination that the first current corresponds to the second current, calculate, using the first node voltage and the second node voltage, a resistance value for one or more electrical components electrically connecting the first node and the second node.

The present disclosure provides an alternating current (AC)/direct current (DC) voltage detection circuit, which includes a rising edge trigger circuit and a detection and output circuit connected to an output terminal of the rising edge trigger circuit. When the detection and output circuit detects that the output signal of the rising edge trigger circuit undergoes preset m target flips in M consecutive clock periods, the detection and output circuit generates an AC determination signal, where m is a natural number.

Methods and apparatus for current sensing and error correction in a switched-mode power supply composed of a high-side transistor coupled to a low-side transistor are described. One example method generally includes capturing a current associated with the low-side transistor at a first time corresponding to the low-side transistor turning off; capturing a current associated with the high-side transistor at a second time corresponding to a first delay after the high-side transistor turns on; capturing the current associated with the high-side transistor at a third time corresponding to the high-side transistor turning off; and applying a first correction current to a current-summing node of the current-sensing circuit for a first interval based on the first delay, wherein the first correction current is based on the captured current associated with the low-side transistor at the first time and on the captured current associated with the high-side transistor at the second time.

System for determining periodic values of phase angle of waveform power input including voltage detector for detecting periodic values of average voltage of waveform power input and detecting corresponding periodic values of peak voltage of waveform power input. System also includes phase angle detector in signal communication for receiving periodic values of average voltage and peak voltage from voltage detector. Phase angle detector also detects periodic values each being ratio of one of periodic values of average voltage divided by corresponding periodic value of peak voltage, or being ratio of peak voltage divided by average voltage; and determines periodic values of phase angle of waveform power input corresponding to periodic values of ratio. Lighting systems.

A method for estimating battery capacity of a battery, includes: sampling a series of voltages across a sensor resistor coupled to the battery when a current flows through the sensor resistor under conditions of default time and default temperature, and recording the voltages as sample voltages; calculating average filtering voltages by filtering white noise in the sample voltages; calculating median filtering voltages by removing impulse noise in the average filtering voltages; detecting data scope of the median filtering voltages in the data characteristic filed; calculating low-pass filtering voltages by using a low-pass filter formula according to the median filtering voltages domain in the data characteristic filed; and estimating the battery capacity of the battery according to the low-pass filtering voltages.

Embodiments are presented herein of an open-loop test system for testing vertical-cavity surface-emitting lasers (VCSELs). A high-speed pulse generator may be used to produce nanoseconds pulses provided to the VCSEL device. A high-speed oscilloscope may be used to measure the resultant nanoseconds pulses across the VCSEL device. The VCSEL device voltage and VCSEL device current may be obtained from the measured nanosecond pulses according to compensation data derived from the system. A pre-test compensation procedure may be used to obtain the compensation data, which may include representative characteristics of each system component. The compensation procedure may also include capturing specified pulse trains under different load conditions of the pulse generator to obtain a scaling relationship between the VCSEL device current and an input voltage used for the pulse generation, and also for obtaining various parameters later used to derive an accurate VCSEL device voltage and an accurate VCSEL device current.

A method is described for determining the state of a vehicle equipped with an electric charge accumulator assembly adapted to power at least one starter device of a thermal engine and/or accessory devices of the vehicle and rechargeable by means of the kinetic energy of said engine, including the detection of the voltage available across the electric charge accumulator assembly of the vehicle in a predetermined succession of moments in time; at least one binary classification of the voltage value available across the accumulator assembly by comparison with a reference voltage value; and the determination of the operating state of the vehicle as a function of the outcome of the binary classification of the value of the voltage available across the accumulator assembly.

An electronic power connector including a contact and a contact core. The contact is configured to electrically connect a power supply to a load. The contact core is configured to receive the contact. The contact core includes a transformer winding configured to sense a current and a sensor slot configured to receive a sensor. In some embodiments, the sensor is configured to sense a temperature. In some embodiments, the sensor is configured to sense a voltage.