Short circuit detection method, short circuit detection circuit, and D-type audio amplifier

Abstract

The invention provides a short circuit detection method, a short circuit detection circuit, and a D-type audio amplifier. The method comprises the steps: changing a voltage of a terminal of a first type through changing the voltage of an energy storage circuit connected with a detected first terminal, setting a corresponding reference voltage according to the size relation between the voltage of the terminal of the first type and the voltage of a terminal of a second type; judging whether there is a short-circuit fault happening between the terminal of the first type and the terminal of the second type or not according to the size relation between the voltage of the terminal of the first type and the corresponding reference voltage. The short circuit detection circuit can detect whether there the short-circuit fault between the terminal of the first type of a detected circuit system and other terminals or not before the detected circuit system is in a normal working state, thereby protecting the detected circuit system from being damaged by an excessively large short-circuit current.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a short-circuit detection method, a short-circuit detection circuit and a class D audio amplifier. Background technique [0002] In various circuit systems, there may be a short circuit between one terminal and another terminal. However, such a short circuit may cause excessive current flowing through a device in the circuit system and damage the device. Therefore, in the circuit system, a short circuit detection circuit is usually provided to determine whether a short circuit occurs between two terminals in the circuit system. [0003] Most of the existing short-circuit detection methods are to detect the current flowing through the components of the circuit system during the working process of the circuit system. There is a short circuit phenomenon, so as to carry out the corresponding short circuit protection measures. For example, in a Class D audio amplifier, especially a hi...

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Problems solved by technology

[0004] However, the above-mentioned existing short-circuit detection methods all need to detect the current on the device during the normal operation of the circuit system. In the case of a very large short-circuit current, the existing short-circuit detection method may cause the device to flow It will be damaged by excessive current, and even cause the entire circuit system chip to burn out

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