The present invention discloses a comparison circuit having adaptive comparison mechanism is provided. A comparator is enabled by an enabling signal having an enabling state during a comparison stage to compare a first voltage and a second voltage to generate a comparison result. A comparison determining circuit sets a stage indication signal at an unfinished state and a finished state before and after the comparison result is generated. A time accumulating circuit starts to accumulate an accumulated time when the enabling signal is at the enabling state and stops accumulating when the stage indication signal is at the finished state to generate a comparison time. A determining circuit performs statistics on the comparison time to generate a predetermined threshold time and sets a predetermined comparison result as the comparison result under the condition that the comparison result is not generated and the accumulated time exceeds the predetermined threshold time.

The present disclosure is a system and method for measuring AC residual current and DC residual current using a singular type-B residual current monitoring device. The system includes a sensor comprising two or more cores that measure residual AC current and residual DC current from two or more current carrying conductors through the cores that carry AC current and DC current. The system includes a controller that sends both an AC excitation current to the cores, as well as a DC nulling current that cancels out the DC residual current, allowing the system to then accurately measure the AC residual current. The system also includes a self-test feature that injects known quantities of both AC current and DC current through the sensor to determine if the sensor is functioning properly.

A test and measurement instrument includes a current measurement device having an input to accept an electrical current for measurement, an output to pass an output current output from the current measurement device, a sense path through which the electrical current is measured, and an active bypass device to pass an amount of current from the input of the current measurement device to the output of the current measurement device without passing through the sense path. The active bypass device may be tuned to allow the current sense device to operate without bypass within a specific range of target current values. Some current measurement devices may include more than one active bypass circuits, each tuned for a different range of input current values.

One or more embodiments are directed to laser circuits, methods and devices that include a current sensing circuit for sensing a lasing current provided to a laser diode or device. One embodiment is directed to a circuit that includes a laser device, a switching device, a current sensing circuit and a current comparator. The switching device has a first conduction terminal coupled to the laser device and a second conduction terminal coupled to a supply voltage. The switching device is configured to operatively supply a lasing current to the laser device. The current sensing circuit is coupled to the switching device and is configured to generate a sense current representative of the lasing current. The current comparator is configured to receive the sense current from the current sensing circuit, to receive a reference current, and to compare the sense current with the reference current. If the sense current exceeds the reference current, the current comparator is configured to output an overcurrent detection signal.

The present disclosure is applicable to electronic fields, and provides a voltage comparator. The voltage comparator includes a first branch, a second branch and a third branch. The first branch and the second branch both have self-biasing capabilities, and require no dedicated bias circuit. Under the same power voltage, the static power consumption of the voltage comparator is relatively low; fewer the power consuming branches exist in the circuit, and the reliability is high under low power consumption.

A battery sensor for sensing at least one battery parameter including at least two measuring units. The measuring units each include at least one sensing device for sensing at least one measured value and at least one evaluation circuit for determining at least one battery parameter from the respectively sensed at least one measured value. An evaluation unit is provided, which compares the battery parameters determined by the evaluation circuits and outputs an error signal in the event that a defined difference between the battery parameters is exceeded.

Two sets of the DC voltages are determined from among sets of DC voltages. At a first temperature, a first voltage of one of the two sets and a first voltage of the other one of the two sets surround a detection voltage that varies substantially proportionally to temperature. The detection voltage is compared with a second voltage of one of the two sets.

Generally, this disclosure provides circuitry and methods for determining the output capacitance of an output load capacitor of a power supply. The output capacitance is generally determined by beginning a calibration period and charging an output capacitor with a current source to generate an output voltage. The output voltage may be compared to a reference voltage, and a time period is determined during which the output voltage is less than the reference voltage. The capacitance value, C, of the output capacitor may be determined based on, at least in part, the determined time period. This disclosure also provides circuitry and methods to adjust certain parameters of the power supply based on the determined C value. For example, in a ramp compensation portion of the power supply, the value of a ramp capacitor and/or reset resistor may be adjusted once the value of C is determined. This may enable, for example, increased efficiency, greater stability and increased bandwidth operation of the power supply when the output load capacitor is changed for different applications.

Approaches are provided for an apparatus having an interface with an input. The input is configured to receive a plurality of current alerts. The apparatus further includes a display device configured to display the current alerts, and a memory configured to store a prior case data structure comprising prior evidence alerts. The apparatus further includes a processor configured to access the prior case data structure from the memory. The processor is further configured to determine whether the prior evidence alerts include a first prior evidence alert related to the first current alert and a second prior evidence alert related to the second current alert. In response to determining the prior evidence alerts include the first and second prior evidence alerts, the processor is further configured to display at the display device an indication of a prior relationship between the first current alert and the second current alert.

A power switching circuit includes a current mirror circuit to generate mirror currents, by transferring, at different mirror ratios, monitored currents that are obtained by monitoring power supply voltages, a selector to select the mirror currents with a combination having the different mirror ratios for the monitored currents, according to a switching state of the power supply voltages, a comparator to compare the mirror currents selected by the selector and output a comparison result, and a switching circuit to switch a supply voltage to be supplied to a load to one of the power supply voltages, based on the comparison result.