Modulation decision device and modulation decision method of power supply circuit, and power supply circuit

Abstract

Disclosed are a modulation decision device and a modulation decision method of a power supply circuit, and the power supply circuit. The modulation decision device is coupled to a to-be-detected circuit and comprises a driving circuit and a comparison circuit. The driving circuit supplies a pulse signal to a first endpoint of the to-be-detected circuit. The comparison circuit is coupled to the first endpoint of the to-be-detected circuit to acquire a first electrical measurement value of the first endpoint, calculates a difference value between the first electrical measurement value and a second electrical measurement value, compares the difference value with a threshold value and outputs a comparison result, wherein the comparison result indicates whether the to-be-detected circuit is provided with a passive element so as to determine whether the power supply circuit is modulated in a first modulation mode or a second modulation mode to supply an output power supply.

Description

technical field [0001] The present invention relates to a modulation determining device, a modulation determining method and the power circuit, in particular to a power supply circuit with multiple modulation modes, its modulation determining device and modulation determining method. Background technique [0002] In various electronic circuits, a stable power supply is one of the important conditions to ensure the normal operation of electronic circuits. A general electronic circuit is equipped with a voltage regulator circuit to provide a stable and reliable voltage level. However, different electronic circuits require different power supplies. In order to meet the different voltage requirements of various electronic circuits, power IC factories will design various types of voltage stabilizing circuits. For example, switching regulators (switching regulators) and linear regulators (linear regulators) are common voltage regulators, and linear regulators are low dropout line...

AI Technical Summary

Problems solved by technology

If no passive components are added to the circuit of the switching regulator, or the passive components fail due to factors such as dust, moisture, etc., it will cause a short circuit, and the output terminal will directly present a square wave signal modulated by the switching circuit. , not only cannot be used in the back-end circuit, but will even damage the back-end circuit components

For another example, when using a low-dropout linear regulator, in order to ensure voltage quality, it is not necessary to add additional passive components and connect them in a direct short circuit. However, if passive components are added, the low-dropout linear regulator will won't be able to operate efficiently

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