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Power amplifier with overcurrent protection

A power amplifier, overcurrent protection technology, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifier protection circuit layout, etc. The power amplifier output is large and other problems, to achieve the effect of high-efficiency over-current protection and power consumption reduction

Inactive Publication Date: 2009-10-14
SHENZHEN INNOSYST TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0031] In view of this, the technical problem to be solved by the present invention is to provide an audio power amplifier to solve the problems of low precision of the overcurrent protection of the audio power amplifier, excessive power consumption of the overcurrent protection circuit, and the inability to maximize the output of the audio power amplifier

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Embodiment Construction

[0066] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0067] figure 2 It is a circuit schematic diagram of an audio power amplifier with overcurrent protection in a specific embodiment of the present invention, figure 2 Including: pulse width modulation clock circuit 201, pulse width modulator 202, inverter 2031, first drive circuit 2041, second drive circuit 2042, third drive circuit 2043, fourth drive circuit 2044, field effect transistor M2051, Field effect transistor M2052, field effect transistor M2053, field effect transistor M2054, field effect transistor M2061, field effect transistor M2062, field effect transistor M2063, field effect transistor M2064, sampling resistor R21, sampling resistor R22, sampling resistor R23, sampling resistor R24 , sampling resistor R25, sampling resistor R26, sampling resistor R27, sampling resistor R28, the first LC low-pass filter 2071, the second LC low...

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Abstract

The invention discloses a power amplifier with overcurrent protection, which is used for protecting a field effect transistor in the output stage of the power amplifier. The power amplifier with overcurrent protection works as the following steps: sampling current is obtained by sampling the current of the drain electrode of the field effect transistor by a sampling circuit which consists of a current mirror circuit; the sampling current is converted into sampling voltage and then is input into an offset comparator; the offset comparator compares the sampling voltage with a reference voltage, generates a [1.1] overcurrent signal and sends the overcurrent signal to the offset comparator; an adjusting circuit generates an adjusting signal according to the overcurrent signal and sends the adjusting signal to a pulse width modulator; the pulse width modulator adjusts the PWM signal according to the adjusting signal so as to adjust the duty cycle of the field effect transistor signal, thus lowering the current of the drain electrode thereof, and realizing the real time, highly efficient and precise protection for the field effect transistor. Simultaneously, the power amplifier with overcurrent protection decreases the power consumption of the sampling circuit by the micro-sampling for the current mirror circuit, thereby reducing static power consumption of the power amplifier and improving work efficiency of the power amplifier.

Description

technical field [0001] The invention mainly relates to the technical field of electronic circuits, in particular to a power amplifier with overcurrent protection. Background technique [0002] Class D audio power amplifiers have been widely used in various consumer electronics products such as DVD, LCD TV, MP4, and mobile phones. Compared with traditional A and B audio power amplifiers, the biggest advantage of D class audio power amplifiers is that they have Extremely high conversion efficiency, for example, the actual conversion efficiency of Class D audio power amplifier can reach more than 80%, and the theoretical conversion efficiency can even reach 100%. [0003] The basic working principle of the Class D audio power amplifier is specifically that the pulse width modulator converts the received input audio signal into a high-frequency square wave signal, and the average value of the high-frequency square wave signal tracks the amplitude of the input signal, thereby con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217H03F1/52
Inventor 许乐平石立勇朱樟明郑浩
Owner SHENZHEN INNOSYST TECH
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