Semiconductor equipment
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHiroshi Nakatake, Akihiko Iwata, Toshiyuki Kikunaga
Life of this patent
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Abstract
In semiconductor equipment, a switching timing adjuster is provided between insulated gate bipolar transistors and a control signal generator. The switching timing adjuster includes an input decision circuit that decides whether a signal output from the overvoltage protector is a signal that has been output due to a deviation in the switching timing at a turn-off or turn-on time, a signal holding circuit that holds a signal that is output from the input decision circuit, and a pulse formation circuit that forms a corrected switching control signal based on a signal held in the signal holding circuit and a switching control signal from the control signal generator.
Claims8
A semiconductor equipment including:
- a plurality of self-extinction semiconductors connected in series;
- an overvoltage protector connected to each self-extinction semiconductor, protecting said self-extinction semiconductor when an overvoltage occurs in said self-extinction semiconductor;
- a control signal generator that generates a switching control signal for controlling said self-extinction semiconductor;
- and
- a switching timing adjuster connected between a control terminal of each self-extinction semiconductor and said control signal generator, said switching timing adjuster comprising
- an input decision circuit that decides whether a signal output from said overvoltage protector has been output based on an overvoltage applied to said self-extinction semiconductor due to a deviation in the switching timing at a turn-on or turn-off time,
- a signal holding circuit that holds a signal corresponding to the overvoltage that is output from said input decision circuit, and
- a pulse formation circuit that forms a corrected switching control signal based on a signal held in said signal holding circuit and a switching control signal from said control signal generator.
A semiconductor equipment including:
- a plurality of self-extinction semiconductors connected in series;
- an overvoltage protector connected to each self-extinction semiconductor;
- and
- a switch that electrically disconnects said self-extinction semiconductor and said overvoltage protector before said self-extinction semiconductor is turned on.
A semiconductor equipment comprising:
- a plurality of self-extinction semiconductors connected in series, each of said self-extinction semiconductors having a control terminal;
- and
- a control signal generator that generates a switching control signal for controlling said self-extinction semiconductors, wherein, corresponding to each of said self-extinction semiconductors there are provided
- an overvoltage protector that protects said self-extinction semiconductor when an overvoltage occurs in said self-extinction semiconductor;
- and
- a switching timing adjuster provided between said control terminal of said self-extinction semiconductor and said control signal generator, said switching timing adjuster having
- an input decision circuit that decides whether a signal output from said overvoltage protector is a signal that has been output based on occurrence of an overvoltage in said self-extinction semiconductor due to a deviation in the switching timing at a turn-on or turn-off time;
- a signal holding circuit that holds a signal corresponding to the overvoltage that is output from said input decision circuit;
- and
- a pulse formation circuit that forms a corrected switching control signal based on a signal held in said signal holding circuit and a switching control signal from said control signal generator.
Dependencies are inferred from the claim text.