CN-122026834-A - Control circuit and chip of power amplifier

Abstract

The application discloses a control circuit and a chip of a power amplifier, wherein the control circuit comprises a digital control module, an analog control module, a first mode and a second mode, wherein the digital control module is used for generating a first switching signal when an accessed audio signal is monitored to meet a first switching condition, and generating a second switching signal when the audio signal is monitored to meet a second switching condition, the analog control module is used for responding to the first switching signal to switch from the first mode to the second mode and responding to the second switching signal to switch from the second mode to the first mode, the first mode is a high-power working mode, and the second mode is a low-power working mode. According to the application, the digital control module is used for monitoring the audio signal in real time, a corresponding switching signal is generated for the analog control module, and then the analog control module is used for switching between a high-power working mode and a low-power working mode, so that the real-time dynamic adjustment of the working mode is realized, the continuity of audio output is ensured, the stability of a circuit is improved, and the hearing feeling is optimized.

Inventors

• BA AO
• ZHANG HANWEN
• Wang Qiyangshuo
• LI SHILIANG

Assignees

• 武汉聚芯微电子股份有限公司

Dates

Publication Date

20260512

Application Date

20251226

Claims (17)

1. 1. A control circuit for a power amplifier, comprising: the digital control module is used for generating a first switching signal when the accessed audio signal is monitored to meet a first switching condition, and generating a second switching signal when the audio signal is monitored to meet a second switching condition; The analog control module is connected with the digital control module and is used for responding to the first switching signal to switch from a first mode to a second mode and responding to the second switching signal to switch from the second mode to the first mode, wherein the first mode is a high-power working mode, and the second mode is a low-power working mode.
2. 2. The control circuit of claim 1, wherein the digital control module comprises a switching control unit and a modulation unit; The switching control unit is used for generating the first switching signal when the audio signal is monitored to meet the first switching condition; The first switching condition comprises at least one of a first accumulated time length reaching a preset first time length, wherein the amplitude of the audio signal is smaller than or equal to a preset first threshold value, the output of the modulation unit is smaller than or equal to a preset second threshold value and the output of a first-stage integrator of the modulation unit is smaller than or equal to a preset third threshold value, and the first accumulated time length is an accumulated time length that the amplitude of the audio signal is continuously smaller than the preset first signal threshold value.
3. 3. The control circuit of claim 2, wherein the switching control unit is further configured to: generating the second switching signal when the audio signal is monitored to meet the second switching condition; The second switching condition comprises at least one of an amplitude of the audio signal being greater than the first signal threshold and an amplitude of the audio signal being less than or equal to the first threshold, an output of the modulation unit being less than or equal to the second threshold, and an output of a first stage integrator of the modulation unit being less than or equal to the third threshold.
4. 4. The control circuit of claim 1, wherein the first switching condition comprises a first sub-condition and a second sub-condition, and the digital control module comprises a switching control unit and a modulation unit, the switching control unit configured to: When the audio signal is monitored to meet the first sub-condition, entering a mode to be entered, wherein the first sub-condition comprises a first accumulated time length reaching a preset first time length, and the first accumulated time length is an accumulated time length that the amplitude of the audio signal is continuously smaller than a preset first signal threshold value; Generating the first switching signal if the audio signal and the modulation unit are monitored to meet the second sub-condition in the mode to be entered, wherein the second sub-condition comprises at least one of an amplitude of the audio signal being smaller than or equal to a preset first threshold value, an output of the modulation unit being smaller than or equal to a preset second threshold value, and an output of a first-stage integrator of the modulation unit being smaller than or equal to a preset third threshold value; And if the amplitude of the audio signal is monitored to be larger than the first signal threshold value in the mode to be entered, exiting the mode to be entered.
5. 5. The control circuit of claim 4, wherein the second switching condition includes a third sub-condition and a fourth sub-condition, the switching control unit further configured to: Entering a mode to be exited when the audio signal is monitored to meet the third sub-condition, wherein the third sub-condition comprises that the amplitude of the audio signal is larger than the first signal threshold; Generating the second switching signal if the modulation unit is monitored to meet the fourth sub-condition in the to-be-exited mode, wherein the fourth sub-condition comprises at least one of the amplitude of the audio signal being smaller than or equal to the first threshold value, the output of the modulation unit being smaller than or equal to the second threshold value, and the output of a first-stage integrator of the modulation unit being smaller than or equal to the third threshold value; and if the first accumulated time length is monitored to reach the first time length in the mode to be exited, exiting the mode to be exited.
6. 6. The control circuit of claim 1, wherein the digital control module is further configured to: And generating the second switching signal when the audio signal is monitored to meet a third switching condition, wherein the third switching condition comprises that the amplitude of the audio signal is larger than a preset signal limit value.
7. 7. The control circuit of claim 1, wherein the digital control module includes a delay compensation unit, and the delay compensation unit is connected to the analog control module and configured to delay the first switching signal or the second switching signal, so that the first switching signal or the second switching signal after delay processing and the audio signal are transmitted to the analog control module at the same time.
8. 8. The control circuit of claim 3 or 5, wherein the second mode comprises a low noise mode, the digital control module further comprises a digital gain unit, the analog control module comprises an analog gain unit, and the first switching signal comprises a first analog gain adjustment signal; The switching control unit is respectively connected with the digital gain unit and the analog gain unit and is used for generating a first digital gain adjustment signal to be output to the digital gain unit and generating the first analog gain adjustment signal to be output to the analog gain unit when the audio signal is monitored to meet the first switching condition; The digital gain unit is used for adjusting the current digital gain according to the first digital gain adjusting signal; The analog gain unit is used for adjusting the current analog gain according to the first analog gain adjusting signal so as to switch to the low noise mode, wherein the adjusting parameter of the current analog gain is the same as the adjusting parameter of the current digital gain.
9. 9. The control circuit of claim 8, wherein the second switching signal comprises a second analog gain adjustment signal; The switching control unit is used for generating a second digital gain adjustment signal to be output to the digital gain unit and generating the second analog gain adjustment signal to be output to the analog gain unit when the audio signal is monitored to meet the second switching condition; The digital gain unit is used for adjusting the current digital gain according to the second digital gain adjusting signal; the analog gain unit is used for adjusting the current analog gain according to the second analog gain adjusting signal so as to switch to the first mode.
10. 10. The control circuit of claim 9, wherein the analog control module further comprises a synchronization unit connected to the switching control unit and the analog gain unit, respectively, the synchronization unit configured to: when the two driving down pipes of the H bridge are monitored to meet a first condition or a second condition, outputting the first analog gain adjusting signal or the second analog gain adjusting signal to the analog gain unit so that the analog gain unit responds to the first analog gain adjusting signal or the second analog gain adjusting signal to adjust the current analog gain, wherein the first condition comprises that the two driving down pipes are simultaneously turned on, the second condition comprises that the two driving down pipes are simultaneously turned off, and the turn-off time is longer than a preset second time period.
11. 11. The control circuit of claim 3 or 5, wherein the second mode comprises a Y-bridge low power mode, the analog control module comprises a Y-bridge drive unit, and the first switching signal comprises a low voltage source enable signal; The switching control unit is connected with the Y-bridge driving unit and is used for generating the low-voltage source enabling signal to be output to the Y-bridge driving unit when the fact that the audio signal meets the first switching condition is monitored; and the Y-bridge driving unit is used for controlling the conduction of a low-voltage driving branch circuit powered by a low-voltage source according to the low-voltage source enabling signal so as to switch to the Y-bridge low-power mode.
12. 12. The control circuit of claim 11, wherein the first mode comprises a Y-bridge high power mode and the second switching signal comprises a high voltage source enable signal; the switching control unit is used for generating the high-voltage source enabling signal to be output to the Y-bridge driving unit when the audio signal is monitored to meet the second switching condition; And the Y-bridge driving unit is used for controlling the high-voltage driving branch circuit powered by the high-voltage source to be conducted according to the high-voltage source enabling signal so as to switch to the Y-bridge high-power mode.
13. 13. The control circuit of claim 12, wherein the analog control module further comprises a synchronization unit connected to the switching control unit and the Y-bridge drive unit, respectively, the synchronization unit configured to: When the two driving down pipes of the H bridge are monitored to meet a first condition or a second condition, outputting the low-voltage source enabling signal or the high-voltage source enabling signal to the Y bridge driving unit so that the Y bridge driving unit responds to the low-voltage source enabling signal or the high-voltage source enabling signal to conduct branch switching, wherein the first condition comprises that the two driving down pipes are simultaneously conducted, the second condition comprises that the two driving down pipes are simultaneously turned off, and the turn-off time is longer than a preset second time period.
14. 14. The control circuit of claim 3 or 5, wherein the second mode comprises a low noise mode and a Y-bridge low power mode, the digital control module further comprises a digital gain unit, the analog control module comprises an analog gain unit and a Y-bridge drive unit, and the first switching signal comprises a first analog gain adjustment signal and a low voltage source enable signal; The switching control unit is respectively connected with the digital gain unit, the analog gain unit and the Y-bridge driving unit and is used for generating a first digital gain adjustment signal to be output to the digital gain unit, generating a first analog gain adjustment signal to be output to the analog gain unit and generating the low-voltage source enabling signal to be output to the Y-bridge driving unit when the audio signal is monitored to meet the first switching condition; The digital gain unit is used for adjusting the current digital gain according to the first digital gain adjusting signal; the analog gain unit is used for adjusting the current analog gain according to the first analog gain adjusting signal so as to switch to the low noise mode, wherein the adjusting parameter of the current analog gain is the same as the adjusting parameter of the current digital gain; and the Y-bridge driving unit is used for controlling the conduction of a low-voltage driving branch circuit powered by a low-voltage source according to the low-voltage source enabling signal so as to switch to the Y-bridge low-power mode.
15. 15. The control circuit of claim 14, wherein the first mode comprises a preset high power mode and a Y-bridge high power mode, and the second switching signal comprises a second analog gain adjustment signal and a high voltage source enable signal; the switching control unit is used for generating a second digital gain adjustment signal to be output to the digital gain unit, generating the second analog gain adjustment signal to be output to the analog gain unit and generating the high-voltage source enabling signal to be output to the Y-bridge driving unit when the audio signal is monitored to meet the second switching condition; The digital gain unit is used for adjusting the current digital gain according to the second digital gain adjusting signal; the analog gain unit is used for adjusting the current analog gain according to the second analog gain adjusting signal so as to switch to the preset high-power mode; And the Y-bridge driving unit is used for controlling the high-voltage driving branch circuit powered by the high-voltage source to be conducted according to the high-voltage source enabling signal so as to switch to the Y-bridge high-power mode.
16. 16. The control circuit of claim 15, wherein the analog control module further comprises a synchronization unit connected to the switching control unit, the analog gain unit, and the Y-bridge drive unit, respectively, the synchronization unit configured to: When the two driving down pipes of the H bridge are monitored to meet a first condition or a second condition, the first analog gain adjusting signal or the second analog gain adjusting signal is output to the analog gain unit, the low-voltage source enabling signal or the high-voltage source enabling signal is output to the Y bridge driving unit, so that the analog gain unit responds to the first analog gain adjusting signal or the second analog gain adjusting signal to adjust the current analog gain, the Y bridge driving unit responds to the low-voltage source enabling signal or the high-voltage source enabling signal to conduct branch switching, wherein the first condition comprises that the two driving down pipes are simultaneously conducted, the second condition comprises that the two driving down pipes are simultaneously turned off, and the turn-off time is longer than a preset second time period.
17. 17. A chip comprising a chip body and the control circuit of any one of claims 1 to 16 disposed on the chip body.

Description

Control circuit and chip of power amplifier Technical Field The present application relates to the field of power amplifiers, and in particular, to a control circuit and a chip for a power amplifier. Background An audio power amplifier (audio power amplifier for short) may amplify an audio signal to drive a speaker, thereby causing the speaker to play sound. At present, the intelligent audio power amplifier generally needs to consider performance indexes under different power scenes, such as efficiency and noise under a low power scene and maximum output power and efficiency under a high power scene. Therefore, in the related art, performance indexes under different power scenes are considered by designing automatic switching of multiple working modes for the intelligent audio power amplifier. However, in the related art, when the modes are switched, the input audio signal needs to be stopped, that is, the audio power amplifier needs to be turned off to perform static switching, so that the continuity of audio output is affected, and the listening feeling is poor. Disclosure of Invention In view of the above, the present application provides a control circuit and a chip for a power amplifier to solve the above technical problems. In a first aspect, the present application provides a control circuit for a power amplifier, the control circuit comprising: The digital control module is used for generating a first switching signal when the accessed audio signal is monitored to meet the first switching condition, and generating a second switching signal when the accessed audio signal is monitored to meet the second switching condition; The analog control module is connected with the digital control module and is used for responding to a first switching signal to switch from a first mode to a second mode and responding to a second switching signal to switch from the second mode to the first mode, wherein the first mode is a high-power working mode, and the second mode is a low-power working mode. In one possible implementation of the present application, the digital control module includes a switching control unit and a modulation unit; The switching control unit is used for generating a first switching signal when the audio signal is monitored to meet the first switching condition; The first switching condition comprises at least one of a first accumulation duration reaching a preset first duration, an amplitude of the audio signal being smaller than or equal to a preset first threshold value, an output of the modulation unit being smaller than or equal to a preset second threshold value and an output of the first-stage integrator of the modulation unit being smaller than or equal to a preset third threshold value, wherein the first accumulation duration is an accumulation duration in which the amplitude of the audio signal is continuously smaller than the preset first signal threshold value. In a possible implementation of the present application, the handover control unit is further configured to: Generating a second switching signal when the audio signal is monitored to meet the second switching condition; The second switching condition includes at least one of an amplitude of the audio signal being greater than a first signal threshold and an amplitude of the audio signal being less than or equal to the first threshold, an output of the modulation unit being less than or equal to a second threshold, and an output of a first stage integrator of the modulation unit being less than or equal to a third threshold. In one possible implementation manner of the present application, the first switching condition includes a first sub-condition and a second sub-condition, and the digital control module includes a switching control unit and a modulation unit, where the switching control unit is configured to: When the audio signal is monitored to meet a first sub-condition, entering a mode to be entered, wherein the first sub-condition comprises that a first accumulated time length reaches a preset first time length, and the first accumulated time length is an accumulated time length that the amplitude of the audio signal is continuously smaller than a preset first signal threshold value; If the audio signal and the modulation unit are monitored to meet the second condition in the mode to be entered, generating a first switching signal, wherein the second condition comprises at least one of that the amplitude of the audio signal is smaller than or equal to a preset first threshold value, the output of the modulation unit is smaller than or equal to a preset second threshold value and the output of a first-stage integrator of the modulation unit is smaller than or equal to a preset third threshold value; and if the amplitude of the audio signal is monitored to be larger than the first signal threshold value in the mode to be entered, exiting the mode to be entered. In a possible implementation of the present application,