Sectional temperature compensation circuit

Abstract

The invention belongs to electronic circuit technologies, and particularly relates to a sectional temperature compensation circuit which comprises a constant-current module, an over-temperature trigger module and a current source module with positive temperature coefficients. Constant currents can flow through load under the effect of the constant-current module; the over-temperature trigger module is connected with the current source module with the positive temperature coefficients, the current source module with the positive temperature coefficients can be switched on under the control of the over-temperature trigger module, and currents of the current source module with the positive temperature coefficients are controlled by the over-temperature trigger module; an output end of the current source module is connected with an inverted input end of the constant-current module, and compensation currents can be outputted from the output end of the current source module. The sectional temperature compensation circuit has the advantages that voltages of input power sources of chips can rise, the temperatures of the chips can be increased, the chips cannot be immediately switched off, voltages on a resistor Rs are linearly reduced, current values are decreased, and accordingly power consumption and the temperatures of the chips can be further reduced; the different temperature coefficients are adopted in different temperature ranges, accordingly, the temperature application ranges of the chips can be expanded, and the load and devices can be effectively protected.

Description

technical field [0001] The invention belongs to the electronic circuit technology, and in particular relates to a segmented temperature compensation circuit. Background technique [0002] Usually, in order to prevent the chip from failing due to heat and burning, most of them have a temperature compensation function. Once the set temperature is exceeded, the operating current will be linearly reduced to maintain its continued operation and reduce the temperature. Most of the existing temperature compensation is full temperature compensation, that is, the same compensation coefficient is used in the entire temperature range, which limits the application environment and cannot meet the requirements of some special applications. [0003] Therefore, for a circuit driven by a constant current, a segmented temperature compensation circuit can well adjust the power consumption of the circuit and protect the driving circuit, and can be applied in various environments. Contents of ...

AI Technical Summary

Problems solved by technology

Most of the existing temperature compensation is full temperature compensation, that is, the same compensation coefficient is used in the entire temperature range, which limits the application environment and cannot meet the requirements of some special applications

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