摘要:
A semiconductor device includes: a cell region; a terminal region; a lower semiconductor layer; a intermediate semiconductor layer on the lower semiconductor layer including a super junction structure; a terminal upper semiconductor layer on the intermediate semiconductor layer; a terminal contact semiconductor region on a surface portion of the terminal upper semiconductor layer adjacent to the cell region; an insulation layer on the terminal upper semiconductor layer having a first part adjacent to the cell region with a small thickness and a second part adjacent to the first part with a large thickness; and a conductive layer in the cell region and a part of the terminal region, the conductive layer extending from the cell region to the part of the terminal region beyond the first part of the insulation layer.
摘要:
A semiconductor switching element driving circuit comprises an overcurrent limiting circuit which instantaneously drops a voltage of a gate terminal of an IGBT when a main IGBT current becomes larger than a predetermined level i1. An overcurrent protection circuit which first decreases the main IGBT current at a first inclination when the main IGBT current becomes larger than the other level i2 lower than the i1 and then reduces the main IGBT current at a steep second inclination when it becomes smaller than another level i3.
摘要:
An improved ignition system for internal combustion engines including a constant current control circuit for effecting constant current control of an ignition coil primary current, further includes a compensating circuit for controlling a reference voltage, which is to be compared with a detection value of the ignition coil primary current, at a constant value irrespective of a decrease of a power supply voltage, thereby controlling the ignition coil primary current at a given value over a wide range of variations of the power supply voltage including a considerable decrease thereof.
摘要:
A supply-voltage-compensated contactless ignition system for internal combustion engines, which includes input transistor operable in response to an engine ignition signal so as to control the operation of a power transistor to control the energization of an ignition coil with the operating level of the input transistors being varied with variation in the supply voltage, further includes a current mirror circuit having first and second current shunt paths including first and second transistors which are connected in parallel with a voltage clamping device such that the each current path substantially the same amount of current when the supply voltage is normal and that one of the current paths shunts a current increased over that of the other in response to a rise of the supply voltage beyond a predetermined value, and includes a shunt device for shunting the increased current to the input transistors.
摘要:
A method for manufacturing a semiconductor device includes the steps of: forming a trench in a semiconductor substrate; and forming an epitaxial film on the substrate including a sidewall and a bottom of the trench so that the epitaxial film is filled in the trench. The step of forming the epitaxial film includes a final step before the trench is filled with the epitaxial film. The final step has a forming condition of the epitaxial film in such a manner that the epitaxial film to be formed on the sidewall of the trench has a growth rate at an opening of the trench smaller than a growth rate at a position of the trench, which is deeper than the opening of the trench.
摘要:
A semiconductor device includes: a center region; a periphery region; and a semiconductor layer including pairs of a first region having a first impurity amount and a second region having a second impurity amount. The first and the second regions are alternately aligned in a plane. The periphery region includes an utmost outer and an utmost inner periphery pairs. The utmost outer periphery pair has a difference between the second and the first impurity amounts, which is smaller than a maximum difference in the periphery region. The utmost inner periphery pair has a difference between the second and the first impurity amounts, which is larger than a difference in the center region.
摘要:
A load drive circuit, disposed to drive an inductive load, includes a reflux closed circuit connected to the load. A flywheel diode is placed in the reflux closed circuit. A MOS transistor, disposed to turn on/off current to drive the load, is connected in parallel to the flywheel diode. A capacitor is disposed to connect its both ends to a gate and a drain of the MOS transistor, while a resistor is disposed to connect its both ends to the gate and a source of the MOS transistor. During a recovery operation of the flywheel diode, with the help of the capacitor and resistor, a gate-to-source voltage of the MOS transistor is pulled up to a value over a threshold for a predetermined period of time. Pulling up the gate-to-source voltage results in a softened recovery characteristic of the flywheel diode, suppressing recovery surges.
摘要:
A semiconductor device includes a first conductive member, a second conductive member, a semiconductor chip, which is located between the conductive members, a bonding member, which is located between the first conductive member and the semiconductor chip, another bonding member, which is located between the second conductive member and the semiconductor chip, a molding resin, which is located between the first and second conductive members to seal the semiconductor chip, and a bonding member anti-sticking means, which is located between the molding resin and a surface of one member selected from the group consisting of the semiconductor chip and the conductive members. The bonding member anti-sticking means prevents the bonding members from sticking to the surface in the manufacturing process. As a result, the otherwise insufficient connection due to the sticking between the molding resin and the surface is improved, and the semiconductor device becomes durable in electric performance.
摘要:
An ignition system for an internal combustion engine is disclosed. The ignition system includes a timing signal detector responsive to the rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to the ignition timing and having a predetermined duty cycle, a triangular wave generator for generating a triangular wave voltage synchronized with the trailing edge of the pulse signal, a voltage storing circuit for storing the voltage level of the triangular wave voltage in synchronism with the leading edge of the pulse signal, a voltage divider for dividing the stored voltage in the voltage storing circuit to generate a reference voltage, a comparator for comparing the reference voltage and the triangular wave voltage to detect a difference therebetween, a charging and discharging controller for correcting the stored voltage in the voltage storing circuit so as to reduce to zero the difference at the leading edge of the pulse signal, a threshold voltage generator for generating a threshold voltage which is offset from the stored voltage by an amount corresponding to the desired dwell time of an ignition coil, and an energization controller for controlling the dwell time of the ignition coil in accordance with the result of a comparison between the threshold voltage and the triangular wave voltage.
摘要:
A semiconductor device includes: a center region; a periphery region; and a semiconductor layer including pairs of a first region having a first impurity amount and a second region having a second impurity amount. The first and the second regions are alternately aligned in a plane. The periphery region includes an utmost outer and an utmost inner periphery pairs. The utmost outer periphery pair has a difference between the second and the first impurity amounts, which is smaller than a maximum difference in the periphery region. The utmost inner periphery pair has a difference between the second and the first impurity amounts, which is larger than a difference in the center region.