A method for protecting a system including a driver integrated circuit includes receiving a driver input signal. The method includes driving an output signal externally to the driver integrated circuit. The output signal is driven based on the driver input signal and an indication of a delay between receipt of an edge of the driver input signal and arrival of a corresponding edge of the output signal at an output node coupled to a terminal of the driver integrated circuit.

The objective is to provide a function of detecting loss of a current detection function, at a time when a switching device has an open failure, in an arm that has the current detection function and a temperature detection function and in which two or more switching devices are connected in parallel with one another. A switching apparatus includes a current detector and a temperature detector provided in at least one of the two or more switching devices that are connected in parallel with one another and a controller that determines an overcurrent in the switching device in which the current detector is provided, that determines an overheating state and a temperature-rising failure in the switching device in which the temperature detector is provided, based on an output of the temperature detector, and that controls the switching devices.

The objective is to provide a function of detecting loss of a current detection function, at a time when a switching device has an open failure, in an arm that has the current detection function and a temperature detection function and in which two or more switching devices are connected in parallel with one another. A switching apparatus includes a current detector and a temperature detector provided in at least one of the two or more switching devices that are connected in parallel with one another and a controller that determines an overcurrent in the switching device in which the current detector is provided, that determines an overheating state and a temperature-rising failure in the switching device in which the temperature detector is provided, based on an output of the temperature detector, and that controls the switching devices.

An uninterruptible power supply and a control method therefor. The uninterruptible power supply includes: an alternating current input end (20) and an alternating current output end (30); a rectification voltage regulating circuit (10), including a first diode (D1) and a first switching tube (Q1) that are connected in series, a second diode (D2) and a second switching tube (Q2) that are connected in series, and a third diode (D5) and a fourth diode (D6); an inverter voltage regulating circuit (40) including a third switching tube (Q3) and a fifth diode (D1′) that are connected in series, a fourth switching tube (Q4) and a sixth diode (D2′) that are connected in series, and a fifth switching tube (Q5) and a sixth switching tube (Q6); an inductor (L); a capacitor (C); a chargeable/dischargeable device for providing a direct current; a seventh switching tube (Q7) connected in series to an output end of the chargeable/dischargeable device; a safety diode (D7) connected in series to the seventh transistor (Q7); a charger (14); and a switch (S). The uninterruptible power supply can provide a stable alternating current, and does not have an automatic voltage regulator.

An uninterruptible power supply and a control method therefor. The uninterruptible power supply includes: an alternating current input end (20) and an alternating current output end (30); a rectification voltage regulating circuit (10), including a first diode (D1) and a first switching tube (Q1) that are connected in series, a second diode (D2) and a second switching tube (Q2) that are connected in series, and a third diode (D5) and a fourth diode (D6); an inverter voltage regulating circuit (40) including a third switching tube (Q3) and a fifth diode (D1′) that are connected in series, a fourth switching tube (Q4) and a sixth diode (D2′) that are connected in series, and a fifth switching tube (Q5) and a sixth switching tube (Q6); an inductor (L); a capacitor (C); a chargeable/dischargeable device for providing a direct current; a seventh switching tube (Q7) connected in series to an output end of the chargeable/dischargeable device; a safety diode (D7) connected in series to the seventh transistor (Q7); a charger (14); and a switch (S). The uninterruptible power supply can provide a stable alternating current, and does not have an automatic voltage regulator.

A power supply control apparatus controls power supply from a DC power source to a load by switching on or off a power supply FET. The current adjustment circuit adjusts the current flowing through the resistor circuit to a value obtained by dividing the voltage between the drain and the source of the power supply FET by the resistance value of the resistor circuit. A drive circuit switches off the power supply FET when a voltage across the detection resistor exceeds a predetermined voltage. The on-resistance value of the power supply FET fluctuates according on the ambient temperature of the power supply FET. The resistance value of the resistor circuit fluctuates in the same direction as the on-resistance value according to the ambient temperature of the power supply FET.

A direct current (DC) power system includes a plurality of energy sources supplying power to a plurality of loads via a DC bus having at least one positive rail. The DC bus includes two DC bus subsections and a DC bus separator coupled between the two DC bus subsections. The DC bus separator includes a controllable switch with at least one of its terminals coupled with a terminal of an inductor to provide a current path between the two DC bus subsections during normal operation via the inductor. The controllable switch is switched off to break the current path when a fault on the positive rail is detected. Furthermore, the DC bus separator includes a diode connected in parallel to the inductor and arranged to provide a circulating current path to dissipate an inductor current in the inductor when the controllable switch is switched off.

A direct current (DC) power system includes a plurality of energy sources supplying power to a plurality of loads via a DC bus having at least one positive rail. The DC bus includes two DC bus subsections and a DC bus separator coupled between the two DC bus subsections. The DC bus separator includes a controllable switch with at least one of its terminals coupled with a terminal of an inductor to provide a current path between the two DC bus subsections during normal operation via the inductor. The controllable switch is switched off to break the current path when a fault on the positive rail is detected. Furthermore, the DC bus separator includes a diode connected in parallel to the inductor and arranged to provide a circulating current path to dissipate an inductor current in the inductor when the controllable switch is switched off.

An overcurrent protection circuit includes an amplifier configured to amplify an inter-terminal voltage of a shunt resistor, an offset application circuit configured to allow the amplifier to provide an output with a predetermined offset voltage additionally applied thereto, a first comparator that compares an output voltage from the amplifier with a predetermined first reference voltage higher than the offset voltage to output a through-current sensing signal when the output voltage from the amplifier is higher than a first reference voltage, and an amplifier failure determination circuit that compares the output voltage from the amplifier with a predetermined second reference voltage that is higher than zero and lower than the offset voltage to output an amplification circuit failure determination signal corresponding to a result of the comparison.

An overcurrent protection circuit includes an amplifier configured to amplify an inter-terminal voltage of a shunt resistor, an offset application circuit configured to allow the amplifier to provide an output with a predetermined offset voltage additionally applied thereto, a first comparator that compares an output voltage from the amplifier with a predetermined first reference voltage higher than the offset voltage to output a through-current sensing signal when the output voltage from the amplifier is higher than a first reference voltage, and an amplifier failure determination circuit that compares the output voltage from the amplifier with a predetermined second reference voltage that is higher than zero and lower than the offset voltage to output an amplification circuit failure determination signal corresponding to a result of the comparison.