A measurement device configured to measure a state of a target device that is capable of switching at least one transmission direction of a channel among transmission directions of electric power transmitted through a plurality of channels. The measurement device retains information indicating whether a reference transmission direction of the electric power transmitted to each of the channels is an input direction in which the electric power is input to the target device or an output direction in which the electric power is output from the target device, acquires a signal indicating a direction and intensity of the electric power, and computes at least one of an input electric power and an output electric power of the target device on the basis of the sign indicating the direction of the above-described signal with respect to the reference transmission direction of the electric power of each of the channels.

The invention discloses a commutation failure protection method, and apparatus, computer device and storage medium thereof. The method comprises: collecting three-phase AC currents on a valve-side of a converter, a DC current on a high-voltage side and a DC current on a neutral terminal; selecting a minimum value of an absolute value of the three-phase AC currents on the valve side as an AC characteristic quantity, and selecting a maximum value of the DC current on the high-voltage side and the DC current on the neutral terminal as a DC characteristic quantity; according to the AC characteristic quantity and the DC characteristic quantity, constructing a minimum characteristic quantity; comparing the minimum characteristic quantity with a first preset threshold, and outputting a commutation judgment result; according to the commutation judgment result, constructing a commutation time interval; comparing the commutation time interval with a second preset threshold and a third preset threshold, and outputting a commutation failure protection judgment result to determine whether a commutation failure occurs. The invention uses minimum current sequence characteristics to track a commutation process of a converter valve, and when a commutation failure occurs, it may make timely, accurate and reliable judgment, thereby ensuring safe operation of valve equipment.

A device includes FETs with control terminals. A gate driver circuit causes the FETs to turn on and to enter a high-impedance state in response to an OCP signal. A current sense circuit senses an FET current through the FETs and sends the OCP signal to the gate driver circuit when the FET current exceeds an OCP current for longer than an OCP deglitch period. A test sequencer, in response to receiving an external test mode signal, sets the OCP current to a preset OCP test current, sets the OCP deglitch period to a preset OCP deglitch test period, and causes the gate driver circuit to turn on the plurality of FETs.

A method for phase-voltage based motor period measurement includes generating a commanded phase voltage and applying the commanded phase voltage to a first phase voltage input of an electric motor, a second phase voltage input of the electric motor, and a third phase voltage input of the electric motor, measuring a first period of a phase voltage associated with the first phase voltage input and the second phase voltage input and comparing the measured first period to a frequency of the commanded phase voltage, and, in response to a determination that the measured first period of the phase voltage associated with the first phase voltage input and the second phase voltage input is outside of a range of the frequency associated with the commanded phase voltage, identifying a fault associated with the first integrated circuit or signal path.

A ripple voltage detector circuit comprises a pulse generator, a direct current-to-direct current (DC-DC) converter coupled to the pulse generator, and a first control loop coupled to the pulse generator and the DC-DC converter. The first control loop is configured to measure an output voltage of the DC-DC converter, determine an output ripple voltage of the output voltage, determine a ripple coefficient based on the output ripple voltage, determine a reference peak inductor current based on the ripple coefficient, and determine a peak value of an inductor current during a switching cycle, and transition a switching state of the DC-DC converter based on the reference peak inductor current and the peak value of the inductor current.

A power supply device includes a power conversion circuit configured to convert an input voltage into an output voltage, a controller, and an output switch. The controller is coupled to the power conversion circuit and configured to control the power conversion circuit to generate the output voltage for causing electrical coalescence of a multi-phase liquid mixture when the output voltage is applied to the multi-phase liquid mixture. The output switch is coupled between an output of the power conversion circuit and a terminal of the power supply device. The output switch is switchable among a first position at which the output of the power conversion circuit is coupled to the terminal, a second position at which the output of the power conversion circuit is grounded, and a third position at which the output of the power conversion circuit is electrically isolated from the terminal and the ground.

A power electronics unit (1) for an electric drive unit, having an electrically conductive carrier element (2) and a power semiconductor module (3) arranged on the carrier element (2). The power semiconductor module (3) is designed to convert a direct current into a three-phase alternating current, and a current sensor (4) used to determine the alternating current is integrated such that it forms a main module (5) with the carrier element (2) and the power semiconductor module (3). A drive train for a motor vehicle having such a power electronics unit (1) is also provided.

The present disclosure relates to a wireless neutral current sensor (WNCS) for monitoring a neutral cable of a capacitor bank. The WNCS may include a power storage device that provides power to allow the WNCS to send a test signal to a capacitor bank controller (CBC) of the capacitor bank to confirm operation of the WNCS during commissioning. The WNCS may include processing and communication circuitry that, during operation, detects an electrical characteristic on the neutral cable. The processing and communication circuitry may provide a message indicating the electrical characteristic to the CBC.

A device includes FETs with control terminals. A gate driver circuit causes the FETs to turn on and to enter a high-impedance state in response to an OCP signal. A current sense circuit senses an FET current through the FETs and sends the OCP signal to the gate driver circuit when the FET current exceeds an OCP current for longer than an OCP deglitch period. A test sequencer, in response to receiving an external test mode signal, sets the OCP current to a preset OCP test current, sets the OCP deglitch period to a preset OCP deglitch test period, and causes the gate driver circuit to turn on the plurality of FETs.

A power supply on-off detection circuit includes: a signal acquisition circuit, a signal conversion circuit, and a signal processing circuit. The signal acquisition circuit is coupled to a power supply through a switch, and is configured to collect an alternating current signal output by the power supply, and to output the alternating current signal to the signal conversion circuit. The signal conversion circuit is configured to convert the alternating current signal into a voltage signal, and to output the voltage signal to the signal processing circuit. The signal processing circuit is coupled to the signal conversion circuit, and is configured to convert the voltage signal into a level signal. The level signal is used to determine whether the power supply is on or off by determining whether the switch is switched on or off.