Over-temperature protection circuit used for high-side power switch

Abstract

The invention discloses an over-temperature protection circuit used for a high-side power switch. The over-temperature protection circuit concretely comprises a reference voltage generation module, a temperature detection module, an output control and shaping module, a positive feedback retardation module and a protection module. The reference voltage generation module generates a stable voltage independent of a temperature and a power supply voltage. The temperature detection module converts a temperature signal into a voltage signal. The output control and shaping module outputs an over-temperature control signal according to change of the detection signal. The positive feedback retardation module adjusts a temperature detection signal according to the over-temperature control signal and achieves temperature retardation. The over-temperature protection circuit can be used for a power integrated circuit of a high-side power switch or the like, and a thermal turn-off threshold point cannot change along with power supply change. In addition, the over-temperature protection circuit can be well compatible with different power switch circuits inputting control levels and is suitable for high-side power switch circuits inputting control levels with various amplitudes.

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

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