A control circuit for the average inductor current of a dc-dc converter

Abstract

The invention discloses a control circuit used for sharing average inductance and current of a DC-DC converter. The circuit comprises a current detection resistor R1, a signal detection amplifier, a data acquisition and storage device, a clock, an adder, a divider, a comparator, a pulse modulation controller PWM (Pulse-width Modulation), a switching tube V1, an inductor L1, a diode D1 and a capacitor C1. The control circuit used for sharing inductance and current of a DC-DC converter disclosed by the invention can overcome the defects of slow detection speed during current sharing, low accuracy and reliability of constant-current control and current-limiting protection and the like in the prior art, and has the advantages of quick current detection speed, and high accuracy and reliabilityof constant-current control and current-limiting protection.

Description

technical field [0001] The present invention relates to a switch-type DC-DC converter, in particular to a control circuit for the average inductor current of the DC-DC converter. Background technique [0002] With the rapid development of electronic technology, the application fields of electronic systems are becoming more and more extensive, and there are more and more types of electronic equipment. The relationship between electronic equipment and people's work and life is becoming increasingly close. Any electronic equipment is inseparable from a reliable power supply, and their requirements for power supply are getting higher and higher. The miniaturization and cost reduction of electronic equipment make the power supply light, thin, small and high-efficiency the development direction. [0003] At present, switching DC-DC converters (that is, voltage converters that effectively output a fixed voltage after changing the input voltage) are widely used in various terminal ...

AI Technical Summary

Problems solved by technology

Compared with the average current control mode, the peak current control mode has the following disadvantages: susceptible to noise interference, slope compensation, and peak / average error

[0013] To sum up, in the process of realizing the present invention, the inventor found that there are at least defects in the prior art, such as slow detection speed when the average current is detected, and low accuracy and reliability of constant current control and current limiting protection.

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