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Noise interference-proof high-side gate drive circuit

A driving circuit and anti-noise technology, applied in the field of common mode noise elimination circuit design, to achieve the effects of low power consumption, filtering out common mode noise, and small overall delay

Active Publication Date: 2012-11-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the noise suppression problem of the high-voltage gate drive chip, the present invention provides a high-side gate drive circuit that can effectively avoid generating false trigger signals and can resist noise interference. The present invention can ensure reliable anti-interference of the overall circuit without affecting The normal working condition of the circuit, while improving the reliability of the system application

Method used

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  • Noise interference-proof high-side gate drive circuit
  • Noise interference-proof high-side gate drive circuit
  • Noise interference-proof high-side gate drive circuit

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Embodiment Construction

[0022] like figure 1 and figure 2 As shown, a high-side gate drive circuit that can resist noise interference includes a high-voltage level shift circuit 1 that can resist common-mode noise interference, a pulse filter circuit 2, an RS flip-flop 3, and an output driver stage circuit 4, which can be The input of the high-voltage level shift circuit 1 against common-mode noise interference is provided by the low-voltage side pulse generation circuit, and its output is used as the input of the pulse filter circuit 2, and the output signal of the pulse filter circuit 2 enters the output driver circuit through the RS flip-flop 3 4. The output drive stage circuit 4 outputs a drive signal to control the switch of the external power tube. The high-voltage level shift circuit 1 that can resist common mode noise interference is composed of LDMOS tube LDM1, LDMOS tube LDM2, and capacitor C 1 , capacitance C 2 , PMOS tube M1, PMOS tube M2, resistor R D1 , resistor R D2 , resistor R ...

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Abstract

The invention discloses a noise interference-proof high-side gate drive circuit. The circuit mainly comprises a common mode noise interference-proof high-voltage level displacement circuit, a pulse filtering circuit, an RS trigger and an output drive stage circuit, wherein the low-side low-voltage pulse generating signals are converted into high-side high-voltage pulse generating signals through the common mode noise interference-proof high-voltage level displacement circuit which can eliminate the common mode noise in the application at the same time; the pulse filtering circuit is used for filtering the residual differential mode noise component, the pulse signals for normal working are only maintained and returned to normal signals through the RS trigger; and then the normal signals are output as square signals through the output drive stage circuit to drive an external high-side power tube.

Description

technical field [0001] The invention relates to the technical field of high-gate drive capable of resisting noise interference, in particular to a design of a common-mode noise elimination circuit used in a half-bridge drive chip used in the field of motor drive to prevent drive tubes from being misoperated. Background technique [0002] The drive circuit plays a very important role in many fields such as motors, automation control, and lighting. It can reduce the size of the product, improve reliability, increase stability, and improve efficiency. [0003] In recent years, with the enhancement of people's awareness of energy saving and environmental protection, many power electronic devices have appeared, which has made the power integrated circuits driving these devices develop vigorously, and realized the real "weak current" control "strong current". Because of its small size, low cost, energy saving, high efficiency and intelligence, it has opened up a new way for the in...

Claims

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Application Information

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IPC IPC(8): H03K19/003
Inventor 祝靖卢云皓钱钦松孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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