DC/DC converter with output voltage and regulating voltage meeting equation y=kx+b

Abstract

The invention provides a DC / DC converter with output voltage and regulating voltage meeting the equation y=kx+b. By means of the stability of a power reference of an output circuit in the DC / DC converter, the voltage between an output voltage hot end and the anode of a reference circuit is a fixed value, the anode potential of the reference circuit is changed by enabling external adjustable voltage to pass through a buffer isolator, so that the output voltage is equal to the value obtained after the external adjustable voltage is added to the fixed value in a certain proportion, and then the purpose that adjustable output is the sum of a fixed value and a certain proportion of regulating voltage is realized. According to the DC / DC converter, a special relationship requirement for automatic adjustment of the output voltage of the DC / DC converter in the current stage of industrial automation is met though an analog circuit, and the requirement is mainly about changing the output voltage of the DC / DC converter automatically through a single-chip microcomputer and the adjustable voltage output by the DC / DC converter and making the output voltage and the adjustable voltage meet the equation y=kx+b, so that the load capacity of the external adjustable voltage is improved on the premise that the stability of a system is not changed.

Description

technical field [0001] The present invention relates to analog electronics DC / DC converter technology. Background technique [0002] As the application range of the DC / DC converter becomes wider and wider, the application mode in which the output voltage is continuously adjustable by external control is becoming more and more popular. At present, in industrial applications, there are mainly two external control methods: one is to achieve continuous adjustment of the output voltage by manually changing the external resistance; The output voltage of the DC / DC converter. [0003] There are mainly two ways to achieve continuous adjustment of the output voltage by changing the external resistance. One is to change the internal reference voltage by changing the external resistance to change the output voltage. See figure 1 ; The other is to change the output voltage by changing the external resistance to change the internal voltage divider resistance, see figure 2 and image ...

AI Technical Summary

Problems solved by technology

[0009] Disadvantage 1: When changing the output voltage, since the three components at the output high potential end and low potential end are connected in series, the maximum current limited by the current limiting resistor will change

[0010] Disadvantage 2: Since the main working principle of this scheme is to change the input current of the reference terminal, the adjustment method is performed at the reference terminal, and in the DC / DC power supply, the reference terminal will set the feedback loop of the entire circuit. For the forward type, it is generally a type 2 compensation network

[0011] In addition, due to the limitation of the output current of the microcontroller and the D / A converter, it will make R DAC The value selection of the adjustment resistor is limited, and the adjustment range will also be limited

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