Class D amplifier with load current sensing and operation method thereof

By introducing output driver stage and current sensing circuits into Class D amplifiers, using operational amplifiers and composite transistors to sense load current, the problems of low efficiency and high cost in the prior art are solved, and efficient and accurate load current monitoring is achieved, suitable for audio systems.

CN120377843APending Publication Date: 2025-07-25NUVOTON
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Patent Information

Application Number
CN202411208963.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-01-24
Filing Date
2024-08-30
Publication Date
2025-07-25

AI Technical Summary

Technical Problem

Existing Class D amplifiers have problems such as low efficiency, high cost and large heat dissipation requirements in load current sensing, especially in audio systems that are difficult to effectively monitor load current.

Method used

The Class D amplifier design with load current sensing includes an output driver stage and current sensing circuit. The load current is sensed using an operational amplifier and composite transistors, and efficient current monitoring is achieved through sense resistors and feedback capacitors, avoiding power dissipation of traditional sense resistors.

Benefits of technology

It improves the power efficiency of Class D amplifiers, reduces system costs and heat dissipation requirements, and realizes accurate monitoring of load current, which is suitable for efficient load current sensing in audio systems.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a class D amplifier with load current sensing and an operation method thereof. The class D amplifier includes an output driver stage and a current sensing circuit. The current sensing circuit includes: an operational amplifier having a positive input terminal and a negative input terminal; the source electrode of the positive input composite transistor is connected to the positive input terminal, and the drain electrode and the grid electrode of the positive input composite transistor are respectively connected to the drain electrode and the grid electrode of a first n-type output transistor; the source electrode of the negative input composite transistor is connected to the negative input terminal, and the drain electrode and the grid electrode of the negative input composite transistor are respectively connected to the drain electrode and the grid electrode of the second n-type output transistor.
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