Over-temperature protection circuit for high-side power switch

Abstract

The invention discloses an over-temperature protection circuit for a high-side power switch, which specifically includes: a reference voltage generation module, a temperature detection module, an output control and shaping module, a positive feedback hysteresis module, and a protection module; Stable voltage independent of temperature and power supply voltage; temperature detection module converts temperature signal into voltage signal; output control and shaping module outputs over-temperature control signal according to the change of detection signal; positive feedback hysteresis module adjusts temperature detection signal according to over-temperature output control signal , to achieve temperature hysteresis; the over-temperature protection circuit proposed by the present invention can be used in power integrated circuits such as high-side power switches, and the thermal shutdown threshold point will not change with the change of the power supply voltage; at the same time, the present invention can be used with different input control circuits The flat power switch circuit is well compatible, and is suitable for high-side power switch circuits with various amplitude input control levels.

Description

technical field [0001] The invention relates to an over-temperature protection circuit suitable for high-side power switches, which is suitable for the field of power integrated circuits. Background technique [0002] The high-side power switch circuit is a hybrid integrated circuit that integrates power devices, gate drive circuits and protection circuits. It is widely used in various fields. Temperature will cause thermal breakdown of the power switch tube, resulting in permanent damage to the power device. Therefore, the chip generally integrates an over-temperature protection circuit near the power tube to realize real-time monitoring of the chip temperature. When the temperature exceeds the threshold value, the power The switch tube is turned off. [0003] The traditional over-temperature protection circuit utilizes the PTAT current and the temperature-sensitive characteristics of the PN junction of the longitudinal PNP. Since the forward voltage drop of the PN junctio...

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to solve the problems of inconsistent forming dimension width and the change of the distance from the nozzle to the upper surface of the cladding layer in the existing GMA additive manufacturing, and to provide a GMA additive manufacturing double passive Visual sensing device and detection method thereof

[0006] In order to solve the defects that the traditional over-temperature protection scheme cannot be used in high-voltage environments such as high-side power switches and the thermal shutdown threshold point is easily affected by power supply voltage fluctuations, the present invention proposes an over-temperature protection for high-side power switch circuits protect the circuit

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