Abstract: A power semiconductor device of the present disclosure includes: a first switching element; a second switching element connected in parallel to the first switching element, and having a higher short circuit capability than the first switching element; drive circuits to drive the first switching element and the second switching element; and determination circuits to compare a target current as a sum of a current flowing through the first switching element and a current flowing through the second switching element to a first threshold and a second threshold greater than the first threshold. The drive circuits switch off the first switching element when the determination circuits determine that the target current is equal to or greater than the first threshold, and switch off the second switching element when the determination circuits determine that the target current is equal to or greater than the second threshold.

Abstract: A power semiconductor device of the present disclosure includes: a first switching element; a second switching element connected in parallel to the first switching element, and having a higher short circuit capability than the first switching element; drive circuits to drive the first switching element and the second switching element; and determination circuits to compare a target current as a sum of a current flowing through the first switching element and a current flowing through the second switching element to a first threshold and a second threshold greater than the first threshold. The drive circuits switch off the first switching element when the determination circuits determine that the target current is equal to or greater than the first threshold, and switch off the second switching element when the determination circuits determine that the target current is equal to or greater than the second threshold.

Abstract: The present technique relates to a protection circuit for a MOSFET and a protection circuit system including the protection circuit all of which can reduce losses in the main current and increase in the manufacturing costs for ensuring a sense area. The protection circuit includes: a first MOSFET for power through which a main current flows; an IGBT which is connected in parallel to the first MOSFET and through which a current diverted from the main current flows; a sense resistor connected in series with the IGBT; and a first control circuit that controls a gate voltage of the first MOSFET based on a value of a voltage to be applied to the sense resistor, wherein a ratio of the diverted current flowing through the IGBT to the main current flowing through the first MOSFET in current value ranges from 0.018% to 0.022%.

Abstract: An inverter driver includes: a switching device; a drive circuit driving the switching device; a current detection device generating a voltage signal corresponding to a current flowing through the switching device; a noise filter removing noise superposed on the voltage signal; an excess current detection circuit outputting an excess current detection signal when the voltage signal input via the noise filter exceeds a first threshold value; and a short circuit detection circuit outputting an error signal when the excess current detection signal is input or the voltage signal input by bypassing the noise filter exceeds a second threshold value.

Abstract: A power module includes one control IC and a plurality of reverse conducting insulated gate bipolar transistors (RC-IGBTs). The control IC has the functions of a high-voltage IC and a low-voltage IC. The plurality of RC-IGBTs are disposed on three of four sides of the control IC and connected to the control IC through only wires.

Abstract: A high-side gate drive circuit includes pulse generating circuits that generate a first pulse synchronized with an input signal, and level shift circuits that shift a level of a reference voltage for the first pulse to a power supply voltage of a high-side switching element. The level shift circuits include MOSFETs to be driven by the first pulse. The high-side gate drive circuit includes a mask signal generating circuit that generates a mask signal that becomes a high level in a period in which source potential of the MOSFETs becomes a high level, and reshot circuits that input, when the first pulse is input into the level shift circuits during a mask period that is a period in which the mask signal is a high level, a second pulse into the level shift circuits after the mask period.

Abstract: A control circuit includes an inverter circuit including a high-side MOSFET and a low-side MOSFET connected to form a totem-pole, a first gate driver configured to switch the low-side MOSFET, a second gate driver configured to switch the high-side MOSFET, a bootstrap circuit configured to supply a voltage to the second gate driver, and a detection section configured to issue an anomaly signal when a current larger than a predetermined value flows in the inverter circuit. In response to the issuing of the anomaly signal, the low-side MOSFET is turned off, and the high-side MOSFET is turned off. After that, in a state in which a freewheeling current is flowing through the low-side MOSFET, the low-side MOSFET is turned on to prevent a bootstrap capacitor of the bootstrap circuit from being overcharged.

Abstract: A high-side gate drive circuit includes pulse generating circuits that generate a first pulse synchronized with an input signal, and level shift circuits that shift a level of a reference voltage for the first pulse to a power supply voltage of a high-side switching element. The level shift circuits include MOSFETs to be driven by the first pulse. The high-side gate drive circuit includes a mask signal generating circuit that generates a mask signal that becomes a high level in a period in which source potential of the MOSFETs becomes a high level, and reshot circuits that input, when the first pulse is input into the level shift circuits during a mask period that is a period in which the mask signal is a high level, a second pulse into the level shift circuits after the mask period.

Abstract: A control circuit includes an inverter circuit including a high-side MOSFET and a low-side MOSFET connected to form a totem-pole, a first gate driver configured to switch the low-side MOSFET, a second gate driver configured to switch the high-side MOSFET, a bootstrap circuit configured to supply a voltage to the second gate driver, and a detection section configured to issue an anomaly signal when a current larger than a predetermined value flows in the inverter circuit. In response to the issuing of the anomaly signal, the low-side MOSFET is turned off, and the high-side MOSFET is turned off. After that, in a state in which a freewheeling current is flowing through the low-side MOSFET, the low-side MOSFET is turned on to prevent a bootstrap capacitor of the bootstrap circuit from being overcharged.

Abstract: The present technique relates to a protection circuit for a MOSFET and a protection circuit system including the protection circuit all of which can reduce losses in the main current and increase in the manufacturing costs for ensuring a sense area. The protection circuit includes: a first MOSFET for power through which a main current flows; an IGBT which is connected in parallel to the first MOSFET and through which a current diverted from the main current flows; a sense resistor connected in series with the IGBT; and a first control circuit that controls a gate voltage of the first MOSFET based on a value of a voltage to be applied to the sense resistor, wherein a ratio of the diverted current flowing through the IGBT to the main current flowing through the first MOSFET in current value ranges from 0.018% to 0.022%.

Abstract: A power module includes one control IC and a plurality of reverse conducting insulated gate bipolar transistors (RC-IGBTs). The control IC has the functions of a high-voltage IC and a low-voltage IC. The plurality of RC-IGBTs are disposed on three of four sides of the control IC and connected to the control IC through only wires.

Abstract: A power module includes one control IC and a plurality of reverse conducting insulated gate bipolar transistors (RC-IGBTs). The control IC has the functions of a high-voltage IC and a low-voltage IC. The plurality of RC-IGBTs are disposed on three of four sides of the control IC and connected to the control IC through only wires.

Abstract: A power module includes one control IC and a plurality of reverse conducting insulated gate bipolar transistors (RC-IGBTs). The control IC has the functions of a high-voltage IC and a low-voltage IC. The plurality of RC-IGBTs are disposed on three of four sides of the control IC and connected to the control IC through only wires.

Abstract: An impact tool for simultaneously providing a rotational force and an impact force to an object has an output shaft rotated by a motor, hammer for intermittently providing an impact force to the output shaft, hammer holder for movably holding the hammer, and an impact force generator for generating the impact force from an output of the motor. An air chamber is formed between the hammer and the hammer holder such that a volume of the air chamber is variable in response to a position of the hammer relative to the hammer holder. In addition, the hammer receives a bias force generated in a direction toward the output shaft by a biasing device. This bias force effectively increases the impact force in cooperation with an air pressure caused by a volume change of the air chamber.

Abstract: A hammer drill includes a motor; a spindle rotatingly driven by the motor and holding an output bit; a motion conversion member for converting rotational movement of the motor to reciprocating movement; a striker reciprocatingly driven by the motion conversion member for applying an axial striking force to the output bit; a striking-motion-releasing mechanism for releasing the striking force applying action exercised by the striker; and a tightening-torque adjusting clutch for interrupting the transfer of the rotational force to the output bit by increasing a load torque.

Abstract: A hammer drill includes a motor; a spindle rotatingly driven by the motor and holding an output bit; a motion conversion member for converting rotational movement of the motor to reciprocating movement; a striker reciprocatingly driven by the motion conversion member for applying an axial striking force to the output bit; a striking-motion-releasing mechanism for releasing the striking force applying action exercised by the striker; and a tightening-torque adjusting clutch for interrupting the transfer of the rotational force to the output bit by increasing a load torque.

Abstract: An impact tool for simultaneously providing a rotational force and an impact force to an object has an output shaft rotated by a motor, hammer for intermittently providing an impact force to the output shaft, hammer holder for movably holding the hammer, and an impact force generator for generating the impact force from an output of the motor. An air chamber is formed between the hammer and the hammer holder such that a volume of the air chamber is variable in response to a position of the hammer relative to the hammer holder. In addition, the hammer receives a bias force generated in a direction toward the output shaft by a biasing device. This bias force effectively increases the impact force in cooperation with an air pressure caused by a volume change of the air chamber.

Abstract: A hammer drill includes a motor; a spindle rotatingly driven by the motor and holding an output bit; a motion conversion member for converting rotational movement of the motor to reciprocating movement; a striker reciprocatingly driven by the motion conversion member for applying an axial striking force to the output bit; a striking-motion-releasing mechanism for releasing the striking force applying action exercised by the striker; and a tightening-torque adjusting clutch for interrupting the transfer of the rotational force to the output bit by increasing a load torque.

Abstract: An exposure apparatus of the invention has a dot array head of a fluorescent type having light-emitting units UR, UG, UB of three primary colors. A controller E is provided with an area dividing unit that divides the dot array head into an image area, in which control of light emission based on image data is performed, and the other non-image areas. In addition, a dot array head control unit in the controller E comprises a light emission control unit that controls the dot array head such that light is emitted based on the image data in the image area and dummy light emission takes place in the non-image area when exposing photographic paper. The dummy light emission data is created by the dummy light emission data creating unit, based on image data corresponding to a single dot D1 adjacent to a boundary of the image area and the non-image area.

Abstract: A hammer drill includes a motor; a spindle rotatingly driven by the motor and holding an output bit; a motion conversion member for converting rotational movement of the motor to reciprocating movement; a striker reciprocatingly driven by the motion conversion member for applying an axial striking force to the output bit; a striking-motion-releasing mechanism for releasing the striking force applying action exercised by the striker; and a tightening-torque adjusting clutch for interrupting the transfer of the rotational force to the output bit by increasing a load torque.