An arithmetic device and a motor drive device including the arithmetic device capable of performing high accuracy motor current calculation, include a control unit performing an arithmetic processing including: acquire a duty ratio; calculate a waiting time according to the duty ratio and a waiting coefficient; detect a shunt current value at a detection timing after lapse of the waiting time; acquire, as a zero-cross current value, the shunt current value; calculate an average value using the shunt current values; and calculate an effective current value by correcting the average value using a correction coefficient.

An over-energy protection circuit, a residual current device, an electronic device, and a power distribution box. The protection circuit has relatively high operating reliability, and includes: a first over-energy absorption circuit, a second over-energy absorption circuit, and a residual current determining circuit. The first over-energy absorption circuit receives a first electrical signal output from a current transformer; and when a voltage value of the first electrical signal is greater than or equal to a first preset threshold, performs step-down processing on the first electrical signal to obtain a second electrical signal, and outputs the second electrical signal to the second over-energy absorption circuit; or when a voltage value of the first electrical signal is less than a first preset threshold, outputs the first electrical signal to the second over-energy absorption circuit.

An apparatus for a first current sensor for a switching converter is presented. The apparatus has an inductor and a first switch. The first switch is arranged to selectively couple the inductor to a first voltage. The first current sensor generates a first output current that is dependent on an inductor current flowing through the inductor The first current sensor compensates for an error arising due to the first switch in the generation of the first output current. The apparatus provides an improved current sensor for a switching converter that overcomes or mitigates the problem of errors in the measurement of a current.

An electronic device for controlling switching timing is described. The electronic device includes load voltage measuring circuitry configured to measure a load voltage to produce a load voltage measurement. The electronic device also includes a processor coupled to the load voltage measuring circuitry. The processor is configured to determine whether a load voltage spike is indicated by the load voltage measurement. The processor is configured to control switching timing based on whether a load voltage spike is indicated.

A power stage includes a power transistor controlled via a driver, the power transistor comprising three terminals, including a collector c, an emitter e and a gate g linked to the driver, the power stage comprising a detection device for detecting a short-circuit current cc between the collector c and the emitter e, the detection device comprising a voltage sensor capable of detecting a voltage Vge at the gate g of the power transistor outside of a predefined voltage range.

A voltage monitoring control system includes voltage control apparatuses controlling voltage on a power distribution line, a local voltage control device adjusting a voltage value controlled by the voltage control apparatuses such that it is maintained within a range between voltage upper-and-lower-limit values updated every first cycle, a voltage and power-flow measurement device calculating and transmitting fluctuation-band information indicating fluctuation band of the voltage every third cycle longer than a second cycle based on voltage on the power distribution line measured every second cycle shorter than the first cycle, and a centralized voltage control device. The centralized voltage control device includes a voltage-fluctuation-band calculation unit calculating fluctuation band within the first cycle, an optimal-voltage-distribution determination unit determining a threshold value for allowance for each of upper and lower limits of an appropriate voltage range and acquiring an optimal control amount, and a voltage upper-and-lower-limit-value determination unit.

A power monitoring circuit and method for detecting deviations in the output of a power supply. The power monitor is configured to detect and measure two different types of deviations: transient deviations short surges or spikes in the current drawn by the device being powered and prolonged deviations over a threshold current that may be intentional, temporary increases in the output of the power supply. The power monitor collects information such as the number of each type of deviation, the duration of each deviation and the peak current describing identified deviations. This collected information can then be used, especially during the development phase, to locate the root cause of the deviation. The components of the power monitor used to detect and measure these deviations may be disabled and enabled as needed.

A USB interface detection module includes a detection unit and an adapting device. The adapting device is electrically connected between a first electronic device and a second electronic device. According to the interface specification of the first electronic device, the voltage value of a configuration channel pin is changeable through the use of the GND_DRAIN pin and the switching action of a field-effect transistor switch. Consequently, the interface specification of the first electronic device is acquired by the second electronic device.

The objective of the present invention is to provide an electric power converting device with which can executes a ground fault detection in a short time with its inexpensive configuration. In one step, the electric power converting device performs level comparison of a difference between output values of low pass filters, with a threshold value −E. If a W-phase is shorted to ground at a time when the U-phase and V-phase lower arm IGBTs are ON and W-phase upper IGBT is ON, the difference between the output values of the low pass filters and becomes small. In another step, a level comparison is made between the absolute value of a difference between the U-phase current value iu and U-phase current command value iu′, and a threshold value F. If the absolute value is lower than the threshold value, the result is determined to be normal, and if the absolute value is greater than the threshold value, the result is determined to be abnormal, because the U-phase is shorted to ground. In another step, a level comparison is made between the absolute value of a difference between the V-phase current iv and the V-phase current command value iv′, and a threshold value F. If the absolute value is lower than the threshold value, the result is determined to be normal, and if the absolute value is greater than the threshold value, the result is determined to be abnormal, because the V-phase is shorted to ground.

The present disclosure describes an apparatus, system, and method of use for detecting electrical faults in a multiphase electric machine. Often in platforms which require redundant reliability or have no readily available electrical connection to earth use ungrounded electrical architectures. This allows the system to continue normal operation even if there is an unintended short circuit or current path (electrical fault) between a phase of an electric machine and its case or some other part of the platform. It is important to be able to readily identify any fault in the phase windings of machinery operating in an ungrounded electrical architecture. Since a single fault in an ungrounded system will not cause any additional current draw or otherwise affect the system, it can be difficult to detect that a fault has even occurred. This provides an advanced warning system.