Step-down direct current switch voltage-stabilized source and voltage stability control method

Abstract

The invention provides a step-down direct current switch voltage-stabilized source and a voltage stability control method. The step-down direct current switch voltage-stabilized source comprises an input filter circuit, a Bosst step-down circuit and an output filter circuit which are connected in sequence, and also comprises a control module connected with the Bosst step-down circuit and a load and a constantan wire which are serially connected with the output filter circuit, wherein an AD sampling port is arranged between the load and the constantan wire; the input filter circuit is used for filtering input voltage DC, the output filter circuit is used for filtering output voltage, and the control module is used for controlling the step-down output of the Bosst step-down circuit. According to the direct current voltage-stabilized source circuit and the voltage stability control method provided by the invention, voltage stability output is realized, and the step-down direct current switch voltage-stabilized source has the advantages of reliable closed-loop control, small output voltage deviation, small voltage regulation factor and high power supply conversion efficiency, so that input voltage, output voltage and output current can be displayed.

Description

technical field [0001] The invention belongs to the field of DC power supplies, and in particular relates to a DC stabilized voltage power supply circuit and a voltage stabilized control method. Background technique [0002] The DC stabilized power supply is one of the commonly used instruments and equipment in the field of electronic technology. Its function is to provide a stable DC output voltage when the grid voltage fluctuates or the load changes. Therefore, the DC stabilized power supply is widely used and important. At present, the existing DC stabilized power supply has a large error in the working process, which affects the accuracy of the entire system. The traditional solution is to adjust the output of the DC stabilized power supply through coarse adjustment and fine adjustment. Due to the resistance of the potentiometer The value change is non-linear, and its adjustment range is narrow, which makes it difficult for ordinary DC regulated power supplies to achieve...

AI Technical Summary

Problems solved by technology

[0002] The DC stabilized power supply is one of the commonly used instruments and equipment in the field of electronic technology. Its function is to provide a stable DC output voltage when the grid voltage fluctuates or the load changes. Therefore, the DC stabilized power supply is widely used and important. At present, the existing DC stabilized power supply has a large error in the working process, which affects the accuracy of the entire system. The traditional solution is to adjust the output of the DC stabilized power supply through coarse adjustment and fine adjustment. Due to the resistance of the potentiometer The value change is non-linear, and its adjustment range is narrow, which makes it difficult for ordinary DC regulated power supplies to achieve accurate adjustment of the output voltage; another example figure 1 The PWM current mode DC-DC step-down control circuit used in the existing regulated power supply is shown. The pulse width modulation of the control circuit is realized by the feedback regulation of the control circuit. When it drops, the sampling voltage entering TL494 drops proportionally. At this time, the internal Uo output of TL494 decreases. By comparing with the sawtooth wave, the output pulse of comparator 2 becomes wider, so as to achieve the purpose of pulse width modulation to stabilize the output voltage, but the circuit The design is relatively complex, the feedback efficiency is low, the loss is large, and the efficiency is relatively low

[0003] As the use time increases, the poor contact of the band switch for coarse adjustment and the potentiometer for fine adjustment will also have a greater impact on the output voltage, and the adjustment is more cumbersome

When the accuracy of the output voltage and current values ​​is high, it is difficult to adjust, and the wear of the band switch and potentiometer will also cause output inaccuracy

This kind of DC stabilized power supply has unintuitive readings, easy wear of the potentiometer, and low precision of voltage stabilization.

Images