Fast downlink level shift circuit with low working voltage

Abstract

The invention discloses a fast downlink level shift circuit with low working voltage. An MOS tube is used as a linear resistor to replace a simple resistor in the 20181084311 application, and two paths of feedback loops composed of PMOS tubes are adopted. When a PMOS tube needs to output a low level, a branch for outputting a low-side low level VSS is conducted; the transmission process of reducing the output level to the low level is accelerated, the transmission delay caused by increasing the resistance is reduced, the delay of the level shift circuit is effectively reduced, the problem thatthe signal is too lagged is solved, and the downlink level shift circuit can work quickly. The HVIC protection module can be applied to the signal conversion process from a high side level to a low side level in an HVIC, more complete transmission of various protection signals can be ensured in a larger working voltage range, and the HVIC protection module can better adapt to different working environments at a higher working speed, so that an HVIC circuit is better protected, and the protection efficiency of the protection module is improved.

Description

technical field [0001] The present invention relates to a level shifting circuit, in particular to a fast downlink level shifting circuit with low working voltage capable of rapidly transforming an input signal of a high voltage level into an output signal of a low voltage level. Background technique [0002] With the rapid development of electronic power technology, especially the increasingly wide application of high-frequency self-turn-off components such as IGBT and MOSFET, the design of the drive circuit is very important, especially the high-voltage integrated circuit HVIC drive. A good driving circuit can ensure the high-performance operation of the HVIC chip, such as excellent system reliability and efficiency. In current consumer and industrial applications, HVICs are widely used in many fields, such as variable frequency motor drives, switching power supplies, and electronic ballasts. [0003] The present invention is a follow-up application filed by the applicant...

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Problems solved by technology

[0008] In order to solve the shortcomings of the applicant's 2018108431121 and 2018212144290 that the response speed of the circuit is too slow and the downlink level shift circuit cannot work quickly, the present invention provides a fast downlink level shift circuit with low operating voltage, which is suitable for 2018108431121 and 2018212144290 The low-side latch circuit in the downlink level shift circuit including the high-side input network, the common gate withstand voltage circuit and the low-side latch circuit has been improved to effectively reduce the delay of the level shift circuit and solve the signal overshoot. The problem of hysteresis, so that the downstream level shift circuit can work quickly

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