Band-gap reference module, over-temperature protection module, LDO circuit and ultrasonic flowmeter

Abstract

The invention relates to a band-gap reference module, an over-temperature protection module, an LDO (Low Dropout Regulator) circuit and an ultrasonic flowmeter. The band-gap reference module, the over-temperature protection module, an error amplification module and a steady-state compensation module which are connected with an input voltage are included; the band-gap reference module is used for outputting reference voltage, and the band-gap reference module is connected with the over-temperature protection module and the error amplification module and inputs the reference voltage to the over-temperature protection module and the error amplification module; the over-temperature protection module is connected with the steady-state compensation module, the error amplification module is connected with the steady-state compensation module, and the steady-state compensation module is used for outputting voltage. The band-gap reference module and the over-temperature protection module are introduced, so that the power consumption of the LDO circuit is reduced, the situation that the temperature of the circuit is too high due to long-term work is avoided, and the LDO circuit is higher in performance, higher in practicability and capable of being better suitable for an ultrasonic flowmeter power management module.

Description

technical field [0001] The invention relates to the technical field of LDO chips, in particular to a bandgap reference module, an over-temperature protection module, an LDO circuit and an ultrasonic flowmeter. Background technique [0002] With the advancement of microcomputer and electronic information technology, various new flowmeters are emerging, developing in the direction of intelligence, and gradually replacing the application of traditional flowmeters in various fields. Ultrasonic flowmeter has the advantages of no moving parts, no intrusion, low loss, high accuracy, easy digital integrated management, and it can measure corrosive liquids and gases. [0003] Ultrasonic flow meter power management module requires low power consumption and high precision in the design process. The core design of the power management module is the design of the LDO chip. Since most of the ultrasonic flowmeters are powered by internal batteries, designing a high-precision, low-power L...

AI Technical Summary

Problems solved by technology

[0004]At present, the common LDO chips used in ultrasonic flowmeters are easy to burn out under high temperature and long-term work, and the output voltage stability of the LDO chips is poor, and the power consumption is high. As a result, the overall stability of the LDO is poor, which limits the scope of application

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