The present application provides a power-down detection circuit and a control method. A low-voltage side power supply is connected to provide an output voltage of the low-voltage side power supply to a power-down detection sub-circuit and provide a standard supply voltage to the power-down detection sub-circuit, a controller and a memory via a voltage conversion circuit. The power-down detection sub-circuit is configured to obtain the output voltage of the low-voltage side power supply, and determine, according to the output voltage of the low-voltage side power supply, whether a power-down event occurs in the low-voltage side power supply. If it is determined that a power-down event occurs, a power-down signal is sent to the controller. The controller receives the power-down signal, and controls the memory to record current information of a high voltage bus sensed by a high-voltage side current sensor.

A staple cartridge for use with a surgical stapler and surgical stapling systems are disclosed. The staple cartridge comprises a cartridge body having a tissue-contacting surface. One or more light emitting diodes (LEDs) are positioned at the edges of the tissue-contacting surface. A plurality of staple drivers is located within the cartridge body each supporting a staple.

A circuit for actively performing short-circuit and a motor controller are provided. The circuit includes an undervoltage detecting circuit, an emergency power supply, a reverse-flow preventing circuit, and a gate level selecting switch. The undervoltage detecting circuit is configured to detect a driving power supply signal outputted from the driving power supply and output, in a case that an amplitude of the driving power supply signal is lower than a first threshold, an emergency active short-circuit enable signal. In response to the emergency active short-circuit enable signal, the emergency power supply is enabled and the gate level selecting switch is controlled to switch from a first conduction path to a second conduction path, to transmit an emergency power supply signal outputted from the emergency power supply to a bridge arm via the second conduction path.

A power distributor, in particular for an on-board network of a motor vehicle, has an intermediate tap, two power outputs, and one each switching unit for each power output. A switch is provided for a need-based blocking of the associated power output. Each of the switching units is designed in such a way that a blocking of the associated power output takes place, if, in the event a voltage drop at the associated power output and/or at the intermediate tap below a first setpoint value, an error case is determined. The greater the corresponding voltage drop, the faster the blocking of the associated power output takes place.

The present invention relates to a system and a method of protecting a battery, and particularly to a system and a method of protecting a battery, which compare current state information of a battery with reference state information and control an operation of a power supplying unit that supplies power supplied from the battery to a load based on a result of the comparison in order to block power supplied from the battery that is in a problem state, thereby protecting a load from the battery in the problem state.

A current monitor circuit includes a sense resistor coupled to a direct current (DC) power supply to sense a current signal, an operational amplifier (op-amp) coupled to the sense resistor to sense a voltage developed across the sense resistor, and a low-pass filter coupled to the op-amp and an analog-to-digital converter (ADC). The low-pass filter reduces aliasing due to out-of-band signal content. The current monitor circuit is coupled to the ADC to provide real-time measurements of power supply load current as input to an active power management (APM) firmware.

An input voltage control device including a first power line inputted with a voltage of 300V to 380V and a second power line inputted with a voltage of 0V. The potential difference between the first power line and the second power line is variable. A constant voltage generator outputs a constant potential voltage of (24V, for example) to a third power line. A reference potential generator outputs a reference potential of (10V, for example). A comparative potential generator outputs a comparative potential which is within the range of (0V to 24V, for example), based on the input voltage. A comparator outputs to an NMOS transistor a conducting potential voltage of (24V, for example) or an interrupting potential voltage of (0V, for example) depending on the comparison between the reference potential and the comparative potential. When the comparator outputs the conducting potential, the path between the source and drain of the NMOS transistor is made conductive. When the comparator outputs the interrupting potential, the path between the source and drain of the NMOS transistor is made non-conductive.

A method and a device provide protection for a multi-terminal HVDC grid against faults. The method includes measuring a DC displacement voltage having a polarity and a value, determining if a short circuit fault exists by comparing the DC displacement voltage with a threshold displacement voltage and identifying a fault type based on the polarity and the value of the DC displacement voltage. The disclosed device contains a converter having a positive pole and a negative pole, a DC-switch substation, a DC line connecting the converter and the DC-switch substation and a transient fault detector. The transient fault detector contains a positive voltage sensor sensing a positive transient voltage of the positive pole and a negative voltage sensor sensing a negative transient voltage of the negative pole and a control unit which is adapted to derive a DC displacement voltage from the positive and the negative transient voltages.

The invention relates to a device for detecting a voltage drop between an anode connection and a cathode connection, comprising: a control capacitor, of which the first electrode is connected to the anode connection and the second electrode is connected to the cathode connection; a measuring device, which is designed to output a discharge signal depending on a potential difference detected between the anode connection and the cathode connection and a first threshold value for the potential difference on a discharge control line; a discharge circuit which is connected to the discharge control line and is designed to discharge the control capacitor depending on the discharge signal; and a control device, which is designed to detect the voltage drop by evaluating the state of charge of the control capacitor.

An aircraft solid state power controller for controlling the supply of electric power from an aircraft electric power supply to an electric load comprises a power input node, which is electrically connectable to an output node of the aircraft electric power supply; a power output node, which is electrically connectable to an electric load and configured for selectively supplying electric power to the electric load; an electric load switch, which is configured for controlling the supply of electric power from the power input node to the power output node; a shunt resistor, which is arranged between the electric load switch and the power output node so that any electric current that is supplied from the aircraft solid state power controller via the power output node to the electric load passes through the shunt resistor; and a control device comprising a voltage sensor that is configured for detecting a voltage drop over the shunt resistor.