摘要:
A power semiconductor device includes a first semiconductor layer, a second semiconductor layer of a first conductivity type, first and second main electrodes, a control electrode and a third semiconductor layer. The second semiconductor layer is formed on the first semiconductor layer. The first and second main electrodes are formed on the second semiconductor layer separately from each other. The control electrode is formed on the second semiconductor layer between the first and second main electrodes. The third semiconductor layer is formed on the second semiconductor layer between the control electrode and the second main electrode.
摘要:
A power semiconductor device is disclosed, which comprises a semiconductor layer including a first semiconductor layer of a first conductivity type and a second semiconductor layer of a second conductivity type, which are periodically formed in the lateral direction, and a power semiconductor element including the semiconductor layers that are formed periodically, wherein a distribution of an amount of an impurity in a vertical direction of the first semiconductor layer differs from a distribution of an amount of an impurity in the vertical direction of the second semiconductor layer.
摘要:
There is provided a delay time calculating method for use in a hierarchical design, capable of accurately calculating the delay amount at a boundary between different level layers in a hierarchical structure. A whole chain (T$01 to T$13) is divided into a first partial chain (T$04 to T$10) and a second partial chain (T$01 to T$03, T$11 to T$13). A first delay amount (TD(4-10)) of the first partial chain (T$04 to T$10) is calculated. A third partial chain (T$01 to T$05, T$09 to T$13) consisting of the second partial chain (T$01 to T$03, T$11 to T$13) and a plurality of chain elements (T$04 to T$05, T$09 to T$10) included in an end region of the first partial chain (T$04 to T$10), is generated, and a second delay amount (TD(1-5), TD(9-13)) of the third partial chain (T$01 to T$05, T$09 to T$13) is calculated. An end chain element (T$05, T$09) of the above mentioned plurality of chain elements (T$04 to T$05, T$09 to T$10) is separated from the third partial chain (T$01 to T$05, T$09 to T$13), and a third delay amount (D(5), D(9)) of the end chain element (T$05, T$09) is calculated. The third delay amount (D(5), D(9)) is subtracted from the second delay amount (TD(1-5), TD(9-13)) to obtain a fourth delay amount (TD(1-4), TD(10-13)). The fourth delay amount (TD(1-4), TD(10-13)) is overwritten to the first delay amount (TD(4-10)) in units of chain elements to calculate the delay amount (TD(1-13)) of the whole chain. Thus, an inaccurate value is canceled, so that an accurate relation between the delay amount of a partial chain and the delay amount of the whole chain can be obtained.
摘要:
A record display medium is provided which can offer a high display contrast and is less likely to cause a lowering of contrast or disappearance of display even in low temperature and high temperature regions. A polymeric material for a liquid crystal/polymer composite film comprising a liquid crystal present in a polymer matrix, a liquid crystal/polymer composite film using the material, and use of the record display medium are also provided. The polymeric material for a liquid crystal/polymer composite film comprising a liquid crystal present in a polymer matrix has a glass transition temperature of 150.degree. C. or above and is insoluble in water.
摘要:
A brake system for a vehicle includes a liquid pressure generating device for generating a liquid pressure dependent upon a manual operation, actuators having output ports for outputting a liquid pressure dependent upon an electrical command signal from a controller, and which are adapted to be connected to a reservoir when the actuators are non-operative, and switchover valves switchable between a state in which wheel brakes are connected to the liquid pressure generating device, and a state in which the wheel brakes are connected to the actuators. In the brake system, on-off valves are connected between the output ports of the actuators and the switchover valves, and are opened when the liquid pressures output from the actuators is equal to or higher than a predetermined value.
摘要:
A traction control device for a vehicle includes a control unit for operating wheel brakes for left and right driven wheels connected to a power source through a differential, when an excessively slipping tendency is produced in one or both of the driven wheels. In the traction control, an input torque supplied from the power source to the differential is detected by an input torque detecting device. A limit driving torque is determined based on a detection value detected by the input torque detecting device at the time when it is detected by a slip detecting device that only one of the driven wheels is fallen into the excessively slipping tendency. A braking torque to be applied to the one driven wheel is determined based on a value resulting from the subtraction of the limit driving torque from a current detection value detected by the input torque detecting device. Consequently, it is possible to reduce the control system into a relatively small size and to improve the control responsiveness and the hysteresis characteristic.
摘要:
A braking force control system of a vehicle includes a deviation reference control quantity determining device for determining an operation control quantity for the actuator on the basis of a deviation between a target deceleration determined on the basis of a quantity of operation of a brake operating member and a detected deceleration of the vehicle. In this control system, the level of operation speed is judged in accordance with whether or not the variation per unit time in quantity of operation of the brake operating member exceeds a preset value. Following two states are switched over from one to another by a switch device: a state 1) in which the operation of the actuator is controlled with an operation control quantity determined in the deviation reference control quantity determining device, when it is decided that the operation speed is slow or low, and a state 2) in which the operation of the actuator is controlled with an operation control quantity determined in an operation quantity reference quantity determining device for determining the operation control quantity on the basis of the quantity of operation of the brake operating member, when the operation speed is fast or high. Thus, the generation of an overshooting can be avoided to improve the responsiveness.
摘要:
According to an embodiment, a trench structure and a second semiconductor layer are provided in a semiconductor device. In the trench structure, a trench is provided in a surface of a device termination portion with a first semiconductor layer of a first conductive type including a device portion and the device termination portion, and an insulator is buried in the trench in such a manner to cover the trench. The second semiconductor layer, which is of a second conductive type, is provided on the surface of the first semiconductor layer, is in contact with at least a side on the device portion of the trench, and has a smaller depth than the trench. The insulator and a top passivation film for the semiconductor device are made of the same material.
摘要:
A semiconductor device includes first, second, third, and fourth semiconductor layers of alternating first and second conductivity types, an embedded electrode in a first trench that penetrates through the second semiconductor layer, a control electrode above the embedded electrode in the first trench, and first and second main electrodes. The fourth semiconductor layer is selectively provided in the first semiconductor layer and is connected to a lower end of a second trench, which penetrates through the second semiconductor layer. The first main electrode is electrically connected to the first semiconductor layer, and the second main electrode is in the second trench and electrically connected to the second, third, and fourth semiconductor layers. The embedded electrode is electrically connected to the second main electrode or the control electrode. A Shottky junction formed of the second main electrode and the first semiconductor layer is formed at a sidewall of the second trench.
摘要:
According to an embodiment, a semiconductor device includes a second semiconductor layer provided on a first semiconductor layer and including first pillars and second pillars. A first control electrode is provided in a trench of the second semiconductor layer and a second control electrode is provided on the second semiconductor layer and connected to the first control electrode. A first semiconductor region is provided on a surface of the second semiconductor layer except for a portion under the second control electrode. A second semiconductor region is provided on a surface of the first semiconductor region, the second semiconductor region being apart from the portion under the second control electrode and a third semiconductor region is provided on the first semiconductor region. A first major electrode is connected electrically to the first semiconductor layer and a second major electrode is connected electrically to the second and the third semiconductor region.