Method for adjusting negative temperature coefficients of constant current source and constant current source

A technology of negative temperature coefficient and constant current source, applied in the field of constant current source, can solve the problems of increasing circuit volume, inability to integrate, expensive thermistor, etc., achieving the effect of small size, easy integration, and improvement of low temperature startup difficulty
CN103135647BActive Publication Date: 2015-06-17MORNSUN GUANGZHOU SCI & TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
MORNSUN GUANGZHOU SCI & TECH
Publication Date
2015-06-17

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Abstract

The invention discloses a method for adjusting negative temperature coefficients of constant current source. The method for adjusting the negative temperature coefficients of the constant current source includes that input voltage V = alpha V BE - V ref is set; the input voltage is added to a resistor to convert to output current I out of the constant current source to obtain a temperature coefficient of the constant current source, wherein V BE is PN junction forward conduction voltage drop of a triode, 1 / V BE * alpha V BE / alpha T is a negative temperature coefficient of the PN junction voltage drop VBE, alpha is a constant, V ref is reference voltage, and T is a temperature; and values of the constant alpha and or values of the reference voltage V ref are selected and set to enable the constant current source to obtain k times negative temperature coefficient of PN junction of the triode to achieve adjustment of the negative temperature coefficients of the constant current source. The invention discloses the constant current source utilizing the method for adjusting the negative temperature coefficients of the constant current source as well. The method for adjusting the negative temperature coefficients of the constant current source and the constant current source utilizing the same have the advantage of being capable of conveniently and greatly adjusting to obtain the negative temperature coefficients of the constant current source.
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Description

technical field

[0001] The invention relates to a constant current source, in particular to a method for adjusting the negative temperature coefficient of the constant current source, and also relates to a constant current source using the method. Background technique

[0002] The ideal constant current source is independent of voltage and temperature, that is, the internal resistance of the constant current source is infinite, and the current value does not change with temperature. Such as figure 1 The general traditional self-excited push-pull converter circuit shown, this kind of self-excited push-pull converter circuit has the disadvantages of being difficult to start at low temperature and easy to burn out in high temperature short circuit, because the self-excited push-pull converter circuit at low temperature The magnification of the circuit is small and requires a large starting current, but at high temperatures the magnification of the circuit is large and only req...

Claims

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