DRIVE CIRCUIT FOR SEMICONDUCTOR ELEMENT AND SEMICONDUCTOR DEVICE

摘要

A primary circuit produces a first on-pulse and a first off-pulse synchronized with a rising edge and a falling edge of an input signal, respectively. A level shift circuit produces a second on-pulse and a second off-pulse formed by shifting the voltage level of the first on-pulse the first off-pulse, respectively. A secondary circuit outputs an output pulse rising and falling in synchronization with the second on-pulse and the second off-pulse, and holds the output when both of the pulses are high. When the reference potential rises, the pulse corresponding to the state of the input signal during the rise of the second potential in the first on-pulse and the first off-pulse is regenerated and one of the second on-pulse and the second off-pulse is thereby made high after the end of the rise of the second reference potential to retransmit the state of the input signal.

主权项

1. A drive circuit for a semiconductor element, comprising:
a primary circuit which receives an input signal and produces, on the basis of a first reference potential, a first on-pulse synchronized with a rising edge of the input signal and a first off-pulse synchronized with a falling edge of the input signal; a level shift circuit which produces, on the basis of a second reference potential different from the first reference potential, a second on-pulse formed by shifting the voltage level of the first on-pulse and a second off-pulse formed by shifting the voltage level of the first off-pulse; a secondary circuit which outputs, as a drive signal for the semiconductor element, an output pulse rising in synchronization with the second on-pulse and falling in synchronization with the second off-pulse, and which holds the output when both the second on-pulse and the second off-pulse are high; and a mask signal production circuit which produces a mask signal which is a pulse signal changing between a high and a low in synchronization with the beginning and the end of the rise of the second reference potential, wherein a re-operating signal according to the state of the input signal during the rise of the second reference potential is generated by the mask signal to generate the first on-pulse or the first off-pulse having a falling edge delayed relative to the mask signal, and one of the second on-pulse and the second off-pulse is thereby made high after the end of the rise of the second reference potential to retransmit the state of the input signal.