For estimating motor torque and velocity, a method estimates a velocity profile for a motor based on line-to-line voltages and phase currents for the motor. The velocity profile is estimated without a position input and a velocity input. The method further estimates a torque profile for the motor based on the line-to-line voltages, the phase currents, and a time interval of the velocity profile of motor velocities greater than a velocity threshold, and wherein the motor is operating over the time interval.

The present disclosure provides an ultrasonic drive and driving method configured for driving an ultrasonic tool. The ultrasonic drive includes a switch module, a sensing element and a control element. The sensing element senses the voltage and current of the ultrasonic tool and generates a sensing signal accordingly. The control element receives the sensing signal and outputs a control signal. The switch module outputs an ultrasonic signal according to the control signal for controlling the vibration of the ultrasonic tool. When the ultrasonic drive operates a frequency sweep function, the control element determines an operating interval and an operating frequency of the ultrasonic signal. When the ultrasonic drive operates a frequency following function, the control element adjusts the operating frequency according to the sensing signal for keeping the impedance of the ultrasonic tool consistent.

A direct current (DC) power rail probe includes a single-ended probe tip, and a two-path circuit having an input coupled to the single-ended probe tip and an output configured for connection to measurement equipment such as an oscilloscope. The two-path circuit includes an alternating current (AC) path in parallel with a feed-forward (FF) path, the AC path including a capacitive element, and the FF path including a series connection of at least one resistive element and an amplifier. The probe tip and two-path circuit are selectively operable in a non-attenuating mode and an attenuating mode.

An electrical energy harvesting system includes at least one variable capacitor, preferably of electro-active polymer, two voltage sources, and a half-bridge network. The voltage sources are arranged in series with an interconnecting node between a first polarity terminal of the first voltage source and a second opposite polarity terminal of the second voltage source. For each variable capacitor the half-bridge network includes a pair of diodes in series with a common node therebetween, connected in parallel with the first voltage source, an inductor connected between the common node and a first terminal of the variable capacitor, a first switch in parallel with the first diode, and a second switch in parallel with the second diode. The second terminal of the variable capacitor is connected to the first polarity terminal of the second voltage source.

A sensor arrangement includes at least one sensor which is connected to a first control unit and a second control unit. The at least one sensor has two sensor connections, and each of the sensor connections of the at least one sensor is electrically connected to an assigned node. Each node is respectively connected downstream of a control unit input of the first control unit and respectively connected upstream of a control unit input of the second control unit.

The present invention discloses a hysteresis comparator comprising an input stage, a hysteresis current generating circuit and an output stage. In the operation of the hysteresis comparator, the input stage is configured to receive a pair of differential input signals to generate at least one differential current signal; the hysteresis current generating circuit is configured to generate at least one hysteresis current to adjust the differential current signal to generate an adjusted differential current signal, wherein the hysteresis current generating circuit includes a common mode voltage detecting circuit for detecting a common mode voltage of the differential input signal for generating the hysteresis current; and the output stage is configured to generate an output signal according to the adjusted differential current signal.

The present invention discloses a hysteresis comparator comprising an input stage, a hysteresis current generating circuit and an output stage. In the operation of the hysteresis comparator, the input stage is configured to receive a pair of differential input signals to generate at least one differential current signal; the hysteresis current generating circuit is configured to generate at least one hysteresis current to adjust the differential current signal to generate an adjusted differential current signal, wherein the hysteresis current generating circuit includes a common mode voltage detecting circuit for detecting a common mode voltage of the differential input signal for generating the hysteresis current; and the output stage is configured to generate an output signal according to the adjusted differential current signal.

A method for determining an estimated current flowing through a winding of a motor that is then controlled on two active phases. A measured voltage is measured for each of the two active phases at the input of the winding, the two measured voltages are corrected to produce a respective corrected voltage, a temperature-compensated resistance of the motor is determined, and at least one estimated current flowing through each of the two active phases, respectively, of the winding is determined on the basis of the temperature-compensated resistance of the motor and the measured voltages of the two active phases.

A high voltage sensing circuit included in a display driver integrated circuit includes a plurality of channels, a plurality of sampling capacitors, an amplifier and a feedback capacitor. The plurality of channels receives a plurality of input voltages. The plurality of sampling capacitors are connected to the plurality of channels, respectively, to simultaneously sample the plurality of input voltages. The amplifier is configured to sequentially receive each of a plurality of sampled input voltages to sequentially generate a respective plurality of sensing voltages. The feedback capacitor is connected between an input terminal and an output terminal of the amplifier, and is shared by the plurality of channels. The amplifier and the feedback capacitor are configured such that each of the plurality of sampled input voltages is sequentially scaled to the respective one of the plurality of sensing voltages by the amplifier and the feedback capacitor.

A power conversion device including an intermediate capacitor that carries out a charging and discharging operation and a voltage sensor that detects a voltage of the intermediate capacitor, and including a current sensor that detects a current flowing in a reactor, and an abnormality determining unit that determines that there is an abnormality of the voltage sensor using a current value calculated based on a detected value from the current sensor, wherein a gain error, an offset error, and a sticking error of the voltage sensor can be detected.