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CN-224205066-U - Clipping detection system and clipping detection device

CN224205066UCN 224205066 UCN224205066 UCN 224205066UCN-224205066-U

Abstract

The application provides a clipping detection system and a clipping detection device, wherein a driving system comprises an extraction circuit, a comparison circuit and a conditioning circuit, wherein a first input end of the comparison circuit is connected with a first output end of the extraction circuit, a second input end of the comparison circuit is connected with a second output end of the extraction circuit, and the conditioning circuit is connected with an output end of the comparison circuit and a controller of a power amplifier. The extraction circuit obtains a first output signal and a second output signal according to output waveforms of the power amplifiers and outputs the first output signal and the second output signal to the comparison circuit, the comparison circuit obtains a comparison signal according to the first output signal and the second output signal and outputs the comparison signal to the conditioning circuit, and the conditioning circuit generates an indication signal based on the comparison signal and outputs the indication signal to the controller so that the controller drives the power amplifiers based on the indication signal. The system can carry out clipping detection on a plurality of power amplifiers simultaneously, has fewer circuit devices, simplifies the circuit, reduces the cost and has higher detection reliability.

Inventors

  • HE ZHAOSHENG

Assignees

  • 苏州爱情之音科技有限公司

Dates

Publication Date
20260505
Application Date
20250528

Claims (10)

  1. 1. A clip detection system for a power amplifier, the clip detection system comprising: The plurality of input ends of the extraction circuit are connected with the output ends of the power amplifiers; A comparator circuit having a first input connected to the first output of the extraction circuit and a second input connected to the second output of the extraction circuit, and The conditioning circuit is connected with the output end of the comparison circuit and the controller of the power amplifier; the extraction circuit is used for obtaining a first output signal and a second output signal according to output waveforms of a plurality of power amplifiers and outputting the first output signal and the second output signal to the comparison circuit, the comparison circuit is used for obtaining a comparison signal according to the first output signal and the second output signal and outputting the comparison signal to the conditioning circuit, and the conditioning circuit is used for generating an indication signal based on the comparison signal and outputting the indication signal to the controller so that the controller drives the power amplifiers based on the indication signal.
  2. 2. The clip detection system of claim 1, wherein the extraction circuit comprises a plurality of extraction modules and a first resistor, each of the extraction modules comprising a second resistor, a third resistor, a first diode, a second diode, a third diode, and a fourth diode; One end of the second resistor and one end of the third resistor are used as input ends of the extraction circuit to be connected with output ends of the power amplifier, the other end of the second resistor is connected with a positive electrode of the first diode and a negative electrode of the second diode, the other end of the third resistor is connected with a positive electrode of the third diode and a negative electrode of the fourth diode, the negative electrode of the first diode is connected with one end of the first resistor and a negative electrode of the third diode, the positive electrode of the second diode and the positive electrode of the fourth diode are connected with the other end of the first resistor, one end of the first resistor is used as a first output end of the extraction circuit to be connected with a first input end of the comparison circuit, and the other end of the first resistor is used as a second output end of the extraction circuit to be connected with a second input end of the comparison circuit.
  3. 3. The clip detection system of claim 2, wherein the comparison circuit comprises a first switch, a first threshold module, a second switch, a second threshold module, a comparator, and a fourth resistor; The controlled end of the first switch is used as a first input end of the comparison circuit to be connected with one end of the first resistor, the first end of the first switch is connected with one end of the fourth resistor and is connected with a power voltage, the second end of the first switch is connected with the first end of the first threshold module, the second end of the first threshold module is grounded, the third end of the first threshold module is connected with the inverting input end of the comparator, the controlled end of the second switch is used as a second input end of the comparison circuit to be connected with the other end of the first resistor, the first end of the second switch is commonly connected with the other end of the fourth resistor, the second end of the second switch is connected with the first end of the second threshold module, the second end of the second threshold module is connected with the power voltage, the third end of the second threshold module is connected with the non-inverting input end of the comparator, and the output end of the comparator is used as an output end of the comparison circuit to be connected with the conditioning circuit; wherein the first switch and the second switch have opposite conduction characteristics.
  4. 4. The clip detection system of claim 3, wherein the first threshold module comprises a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the second end of the first switch as a first end of the first threshold module, a node of the other end of the fifth resistor connected to one end of the sixth resistor is connected to the inverting input of the comparator as a third end of the first threshold module, and the other end of the sixth resistor is grounded as a second end of the first threshold module; And/or the number of the groups of groups, The second threshold module comprises a seventh resistor and an eighth resistor, one end of the seventh resistor is used as a first end of the second threshold module to be connected with the second end of the second switch, a node, connected with one end of the eighth resistor, of the other end of the seventh resistor is used as a third end of the second threshold module to be connected with the non-inverting input end of the comparator, and the other end of the eighth resistor is used as a second end of the second threshold module to be connected with the power voltage.
  5. 5. The clip detection system of claim 1, wherein the conditioning circuit comprises a third switch, a fourth switch, a fifth switch, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor; The controlled end of the third switch is connected with the output end of the comparison circuit, the first end of the third switch is connected with one end of the ninth resistor and the first end of the fourth switch, the other end of the ninth resistor is connected with a power voltage, the controlled end of the fourth switch is connected with a threshold voltage, the second end of the third switch is connected with one end of the tenth resistor and one end of the eleventh resistor, the other end of the eleventh resistor is connected with the controlled end of the fifth switch, the first end of the fifth switch is commonly connected with the second end of the fourth switch and the other end of the tenth resistor, the second end of the fifth switch is connected with one end of the controller and the twelfth resistor, and the other end of the twelfth resistor is connected with a power voltage.
  6. 6. The clip detection system of claim 1, wherein the conditioning circuit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a sixth switch; One end of the thirteenth resistor is connected with the output end of the comparison circuit, the other end of the thirteenth resistor is connected with one end of the fourteenth resistor and the controlled end of the sixth switch, the first end of the sixth switch is commonly connected with the other end of the fourteenth resistor, the second end of the sixth switch is connected with one end of the fifteenth resistor and the controller, and the other end of the fifteenth resistor is connected with a power supply voltage.
  7. 7. The clip detection system of any of claims 1-6, wherein the clip detection system further comprises: The first end of the filter circuit is connected with the output end of the comparison circuit, the second end of the filter circuit is grounded, and the third end of the filter circuit is connected with the conditioning circuit.
  8. 8. The clip detection system of claim 7, wherein the filter circuit comprises a fifth diode, a first capacitor, and a sixteenth resistor; The positive pole of the fifth diode is connected with the output end of the comparison circuit, the negative pole of the fifth diode is connected with the first polar plate of the first capacitor, one end of the sixteenth resistor and the conditioning circuit, and the second polar plate of the first capacitor is commonly connected with the other end of the sixteenth resistor.
  9. 9. The clip detection system of claim 7, wherein the filter circuit comprises a sixth diode, a seventh diode, a seventeenth resistor, an eighteenth resistor, and a second capacitor; The negative electrode of the sixth diode is connected with the output end of the comparison circuit and the positive electrode of the seventh diode, the positive electrode of the sixth diode is connected with one end of the seventeenth resistor, the other end of the seventeenth resistor is connected with the conditioning circuit, one end of the eighteenth resistor and the first polar plate of the second capacitor, the other end of the eighteenth resistor is connected with the negative electrode of the seventh diode, and the second polar plate of the second capacitor is grounded.
  10. 10. A clip detection apparatus, comprising: A plurality of power amplifiers; a controller, and The clip detection system of any of claims 1-9, the clip detection system being coupled to the controller and to the outputs of a plurality of the power amplifiers.

Description

Clipping detection system and clipping detection device Technical Field The present application relates to the technical field of audio power amplifiers, and more particularly, to a clip detection system and a clip detection apparatus. Background At present, a power amplifier is generally arranged in an audio device to amplify and output an audio signal, however, the power amplifier may have a clipping problem during operation, and the clipping problem may affect sound quality, generate distortion, and may even damage devices such as a speaker connected with the power amplifier. For this reason, clipping detection of the power amplifier is required. In the related art, a clipping detection circuit is usually disposed corresponding to each output of the power amplifier, so that the circuit is complex, the circuit devices are more and the cost is higher. Disclosure of utility model In order to solve the above problems, the present application provides a clipping detection system and a clipping detection device, which aims to solve the problems of complex circuit, more circuit devices and higher cost when a clipping detection circuit is correspondingly arranged for the output of each power amplifier in the related art. In a first aspect, the application provides a clipping detection system, which comprises an extraction circuit, a comparison circuit and a conditioning circuit, wherein a plurality of input ends of the extraction circuit are connected with output ends of a plurality of power amplifiers, a first input end of the comparison circuit is connected with a first output end of the extraction circuit, a second input end of the comparison circuit is connected with a second output end of the extraction circuit, and the conditioning circuit is connected with the output end of the comparison circuit and a controller of the power amplifiers. The extraction circuit is used for obtaining a first output signal and a second output signal according to output waveforms of the power amplifiers and outputting the first output signal and the second output signal to the comparison circuit, the comparison circuit is used for obtaining a comparison signal according to the first output signal and the second output signal and outputting the comparison signal to the conditioning circuit, and the conditioning circuit is used for generating an indication signal based on the comparison signal and outputting the indication signal to the controller so that the controller drives the power amplifiers based on the indication signal. In the technical scheme, the extraction circuit in the clipping detection system provided by the application is connected with the output ends of the power amplifiers so as to simultaneously acquire and detect the output waveforms of the power amplifiers, and positive and negative peaks of all output channels are extracted based on the output waveforms of the power amplifiers so as to judge whether clipping phenomenon exists between positive peaks and negative peaks in the output waveforms, so that the detection reliability is higher. And then the comparison circuit and the conditioning circuit generate corresponding detection signals (namely indication signals) so that the controller drives the power amplifier based on the indication signals, thereby adjusting the output of the power amplifier, reducing the problem of clipping, and improving the service reliability and service life of the power amplifier. And moreover, a clipping detection system can be used for simultaneously carrying out clipping detection on a plurality of power amplifiers, so that circuit devices are fewer, a circuit is simplified, and the cost is reduced. With reference to the first aspect, in some possible implementations, the extraction circuit includes a plurality of extraction modules and a first resistor, each extraction module includes a second resistor, a third resistor, a first diode, a second diode, a third diode and a fourth diode, one end of the second resistor and one end of the third resistor are connected as input ends of the extraction circuit to the output end of the power amplifier, the other end of the second resistor is connected to the positive electrode of the first diode and the negative electrode of the second diode, the other end of the third resistor is connected to the positive electrode of the third diode and the negative electrode of the fourth diode, the negative electrode of the first diode is connected to one end of the first resistor and the negative electrode of the third diode, the positive electrode of the second diode and the positive electrode of the fourth diode are connected to the other end of the first resistor, one end of the first resistor is connected as a first output end of the extraction circuit to the first input end of the comparison circuit, and the other end of the first resistor is connected as a second output end of the extraction circuit to the second input end of the compariso