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Heat regulating device and method for D-type audio amplifier and D-type audio amplifier with heat regulation

An amplifier and thermal regulation technology, applied in the layout of amplifier protection circuits, amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., to reduce discomfort and avoid excessive operating temperature.

Inactive Publication Date: 2013-09-11
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, there are above-mentioned inconveniences and problems in the overheat protection device of the known D class audio amplifier.

Method used

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  • Heat regulating device and method for D-type audio amplifier and D-type audio amplifier with heat regulation
  • Heat regulating device and method for D-type audio amplifier and D-type audio amplifier with heat regulation
  • Heat regulating device and method for D-type audio amplifier and D-type audio amplifier with heat regulation

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Embodiment Construction

[0068] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0069] see now figure 2 , figure 2It is a system block diagram of an embodiment of the present invention. The thermal adjustment device 14 includes a thermal sensing circuit 15 and an automatic gain control circuit 16. The audio signal Vin is amplified by the automatic gain control circuit 16 to kVin input pulse width modulation (Pulse Width Modulation; PWM ) circuit 18 to generate a PWM signal to the gate driver 10 . The thermal sensing circuit 15 monitors the operating temperature of the class-D audio amplifier, and when the operating temperature exceeds a default value, such as 100°C, the overheating signal TS is triggered to make the automatic gain circuit 16 reduce the gain k of the amplifier, thereby reducing the output of the PWM circuit 18. input, causing the output of the amplifier to attenuate as shown in waveform 19. With this mechanism of red...

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Abstract

The invention relates to a heat regulation device for a D-type audio amplifier, which comprises a heat sensing circuit and an automatic gain control circuit. The heat regulation device is characterized in that the heat sensing circuit monitors the working temperature of the D-type audio amplifier and triggers a overtemperature signal when the working temperature is higher than a default, and the automatic gain control circuit reduces the gain of the D-type audio amplifier according to the overtemperature signal . The heat regulation device and method for a D-type audio amplifier have the advantages of avoiding the overhigh working temperature of the D-type audio amplifier and reducing the uncomfortableness of listeners when music is played.

Description

technical field [0001] The present invention relates to a class D amplifier, in particular, an over temperature protection (Over Temperature Protection; OTP) for a class D audio amplifier. Background technique [0002] Generally, Class D audio amplifiers are equipped with an overheating protection circuit to prevent them from being damaged or burned due to overheating. Such as figure 1 As shown, when the overheat protection circuit 12 detects that the operating temperature of the amplifier exceeds a default value (usually 150° C.), it sends a shutdown signal to shut down the gate driver 10 . Although this mechanism can protect the amplifier from burning out, it also causes the current supply to the load 11 to be cut off instantaneously, thus generating a pop, which makes the user feel uncomfortable in hearing. [0003] To reduce plosives, known class D audio amplifiers are provided with filters to filter out plosives. But even with the crackle removed, the momentary inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/52H03F3/217
Inventor 陈俊聪郭俊彦王忠富
Owner RICHTEK TECH
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