CN116707460A - Protection circuit of audio power amplifier - Google Patents
Protection circuit of audio power amplifier Download PDFInfo
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- CN116707460A CN116707460A CN202310281163.0A CN202310281163A CN116707460A CN 116707460 A CN116707460 A CN 116707460A CN 202310281163 A CN202310281163 A CN 202310281163A CN 116707460 A CN116707460 A CN 116707460A
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- 238000001514 detection method Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 239000000872 buffer Substances 0.000 claims description 4
- 210000005069 ears Anatomy 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 208000028659 discharge Diseases 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/041—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature additionally responsive to excess current
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The utility model discloses a protection circuit of an audio power amplifier, which is connected with an audio power amplifier circuit and comprises: input, output, first switch, bleeder circuit, fast comparator, current detection circuit, temperature detection circuit, remove shake circuit, charge pump high voltage generation circuit, inverter, second switch, first electric capacity and first zener diode, wherein: the first switch is connected between the input end and the output end and is an nmos tube; the input end is connected with a power supply, and the power supply is provided with an input voltage; the rapid comparator is connected between the voltage dividing circuit and the jitter removing circuit, and the jitter removing circuit detects the voltage output by the voltage dividing circuit and compares the voltage with a reference voltage; the current detection circuit detects the current magnitude of the input end and the output end and compares the current magnitude with a preset current range value; the temperature detection circuit detects the temperature inside the circuit and compares it with a preset temperature range.
Description
Technical Field
The utility model relates to the field of electronic circuits, in particular to a protection circuit of an audio power amplifier.
Background
The first technical scheme is as follows: the utility model CN102201791B discloses a power protection device integrated in a power amplifier chip. According to the scheme, the current flowing through the output pipe is detected by connecting resistors in series with the output pipe, and the CE voltage of the output pipe is detected by utilizing the parallel resistors between the output pipes CE, so that the power protection function of the output power pipe is completed.
The second technical scheme is as follows: the utility model CN205509988U discloses a power amplifier protection circuit, which adopts an overcurrent detection circuit to detect an abnormal large current signal, and realizes the protection of the power amplifier by compressing the signal output amplitude and muting the power amplifier through a mute control pin.
Both of the above schemes can only start the protection action when the output power of the power amplifier is too high, but for the power supply voltage being too high, especially when there is a surge of the power supply voltage that is greater than the withstand voltage range of the power tube, the power amplifier chip is easily broken down.
The third technical scheme is as follows: the utility model CN110829987A discloses a power amplifier protection circuit and electronic equipment. The utility model introduces a voltage detection unit to detect whether the power supply voltage exceeds the working range of the power amplifier chip, and when the power supply voltage exceeds the working range, a current discharge unit is used for carrying out current discharge treatment on the power supply voltage, thereby realizing the protection of the power amplifier chip.
The above scheme adopts the processing mode of reducing the power supply voltage through the current discharge unit, so that when higher surge voltage exists on the power supply, the power supply voltage cannot exceed the maximum withstand voltage value inside the chip only by requiring extremely large discharge current. In addition, when the discharge current is large, the excessive discharge current impact easily causes the overload of the front-end power supply to generate a protection action, so that the cascade fault reaction generated by the front-end power supply is caused.
The fourth technical scheme is as follows: the utility model CN101083392A discloses a direct-current power supply surge suppressor which comprises an induced surge voltage sampling circuit, a voltage clamping circuit, an overvoltage switching circuit, a solid-state relay and a shell. The direct current surge signal on the power supply is monitored through an amplifying and sampling circuit, and after the surge voltage is larger than a certain preset value, the solid state relay is controlled to be cut off, so that the subsequent circuit is protected.
The scheme is realized by adopting a plurality of discrete devices, so that the precision is lower, the cost is higher and the reliability is lower. In addition, since the start and end of the protection operation are controlled by one amplifying circuit, they have similar start and end periods. When applied to an audio control circuit, plosive sounds are produced which are intolerable to the human ear.
Disclosure of Invention
The present utility model provides a protection circuit for an audio power amplifier, which is used for solving at least one problem existing in the prior art.
In order to achieve the above object, the present utility model provides a protection circuit of an audio power amplifier, which is connected to an audio power amplifier circuit, and includes: input, output, first switch, bleeder circuit, fast comparator, current detection circuit, temperature detection circuit, remove shake circuit, charge pump high voltage generation circuit, inverter, second switch, first electric capacity and first zener diode, wherein:
the first switch is connected between the input end and the output end, and is an nmos tube;
the input end is connected with a power supply, and the power supply is provided with an input voltage;
the rapid comparator is connected between the voltage dividing circuit and the jitter removing circuit, and the jitter removing circuit detects the voltage output by the voltage dividing circuit and compares the voltage with a reference voltage;
the current detection circuit detects the current magnitude of the input end and the output end and compares the current magnitude with a preset current range value;
the temperature detection circuit detects the temperature inside the circuit and compares the temperature with a preset temperature range;
when at least one of the voltage detected by the voltage dividing circuit, the current detected by the current detecting circuit and the temperature detected by the temperature detecting circuit is abnormal, the voltage, the current and the temperature detected by the voltage dividing circuit pass through the jitter removing circuit to reduce possible false judgment, and then a starting protection action signal is output;
the inverter is connected between the debounce circuit and the second switch, when the starting protection action signal is received, the inverter buffers and amplifies the starting protection action signal and outputs the starting protection action signal to the second switch, the second switch is an nmos tube, the charge pump high-voltage generating circuit is connected with the output end of the debounce circuit, the grid electrode of the first switch and the drain electrode of the second switch, and the grid electrode voltage of the first switch is reduced to the ground level and is disconnected so as to cut off the voltage input by the input end;
the first capacitor is connected between the grid electrode of the first switch and the ground, and the first zener diode is connected between the grid electrode of the first switch and the output end;
when an action signal entering a normal working state is received, the charge pump high-voltage generating circuit generates an extremely small current signal, the current signal is slowly integrated on the first capacitor, so that the gate voltage of the first switch is slowly increased, a preset proportional relation exists between the output current value of the charge pump high-voltage generating circuit and the capacitance value of the first capacitor, and the voltage change frequency output by the output end is smaller than the minimum audio frequency of 20Hz visible by human ears, so that starting-up noise is eliminated.
In one embodiment of the present utility model, the protection circuit of the audio power amplifier further comprises an audio power amplifier reset control circuit,
the audio power amplifier reset control circuit is connected with the jitter removing circuit and the audio power amplifier circuit;
when receiving the start-up protection action signal, the audio power amplifier reset control circuit outputs an audio power amplifier reset signal to the audio power amplifier circuit so as to set the audio power amplifier circuit in a reset mode, so that the audio power amplifier circuit does not have audio output,
when the protection action signal is received, the charge pump high-voltage generation circuit controls the first switch to be closed, and after the output voltage of the output end reaches a normal range, the audio power amplifier reset control circuit stops outputting an audio power amplifier reset signal, and starting-up noise is eliminated by using the reset enable of the audio power amplifier circuit.
In one embodiment of the present utility model, the charge pump high voltage generation circuit is replaced by a high voltage power supply and a waveform generator connected to each other.
In an embodiment of the present utility model, a protection circuit of an audio power amplifier is connected to a plurality of audio power amplifier circuits, each audio power amplifier circuit corresponds to one of the channels, the protection circuit of the audio power amplifier includes a front-end circuit and a plurality of back-end circuits, the front-end circuit is formed by an input end, a voltage dividing circuit, a fast comparator, a current detecting circuit, a temperature detecting circuit and a jitter removing circuit, the back-end circuit is formed by an output end, a first switch, a charge pump high voltage generating circuit, an inverter, a second switch, a first capacitor and a first voltage stabilizing diode, and each back-end circuit is connected to one of the audio power amplifier circuits.
The protection circuit of the audio power amplifier provided by the utility model can monitor the input voltage and current of the audio power amplifier circuit in real time, and when the monitored voltage or current exceeds a preset value, the protection action is started to cut off the power supply of the audio power amplifier circuit, so that the audio power amplifier circuit is effectively protected.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a protection circuit of an audio power amplifier according to a first embodiment of the present utility model;
fig. 2 is a circuit diagram of a protection circuit of an audio power amplifier according to a second embodiment of the present utility model;
fig. 3 is a circuit diagram of a protection circuit of an audio power amplifier according to a third embodiment of the present utility model;
fig. 4 is a flowchart of the operation of the protection circuit of the audio power amplifier according to the present utility model.
Reference numerals illustrate: 1-an input terminal; 2-an output; 3-a first switch; a 4-voltage dividing circuit; 5-a fast comparator; 6-a current detection circuit; 7-a temperature detection circuit; 8-a de-jitter circuit; 9-a charge pump high voltage generation circuit; a 10-inverter; 11-a second switch; 12-a first capacitance; 13-a first zener diode; 14-an audio power amplifier reset control circuit; 15-a high voltage power supply; 16-waveform generator.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
Fig. 1 is a circuit diagram of a protection circuit of an audio power amplifier according to a first embodiment of the present utility model, and as shown in fig. 1, the protection circuit of the audio power amplifier provided by the present utility model is connected to an audio power amplifier circuit, and includes: input 1, output 2, first switch 3, bleeder circuit 4, fast comparator 5, current detection circuit 6, temperature detection circuit 7, debounce circuit 8, charge pump high voltage generation circuit 9, inverter 10, second switch 11, first electric capacity 12 and first zener diode 13, wherein:
the first switch 3 is connected between the input end 1 and the output end 2, and the first switch 3 is an nmos tube;
the input terminal 1 is connected to a power source (not shown) having an input voltage;
the fast comparator 5 is connected between the voltage dividing circuit 4 and the debounce circuit 8, and the debounce circuit 8 detects the voltage output by the voltage dividing circuit 4 and compares the voltage with a reference voltage Vref;
the current detection circuit 6 detects the current magnitude of the input end 1 and the output end 2 and compares the current magnitude with a preset current range value;
the temperature detection circuit 7 detects the temperature inside the circuit and compares the temperature with a preset temperature range;
when at least one of the voltage detected by the voltage dividing circuit 4, the current detected by the current detecting circuit 6 and the temperature detected by the temperature detecting circuit 7 is abnormal, the voltage, the current and the temperature detected by the voltage dividing circuit are subjected to a jitter removing circuit 8 to reduce possible false judgment, and then a starting protection action signal is output;
the inverter 10 is connected between the debounce circuit 8 and the second switch 11, when receiving the start-up protection action signal, the inverter 10 buffers and amplifies the start-up protection action signal and outputs the buffer amplified start-up protection action signal to the second switch 11, the second switch 11 is an nmos tube, the charge pump high voltage generating circuit 9 is connected with the output end of the debounce circuit 8, the grid electrode of the first switch 3 and the drain electrode of the second switch 11, the grid electrode voltage of the first switch 3 drops to the ground level and is disconnected, so that the voltage input by the input end 1 is cut off, the on-resistance of the second switch 11 is set to be a smaller value, and therefore the first switch 3 can be disconnected in a very short time;
the first capacitor 12 is connected between the gate of the first switch 3 and ground, and the first zener diode 13 is connected between the gate of the first switch 3 and the output terminal 2;
when the action signal entering the normal working state is received, the charge pump high-voltage generating circuit 9 generates a very small current signal, the current signal is slowly integrated on the first capacitor 12, so that the gate voltage of the first switch 3 is slowly increased, a preset proportional relation exists between the output current value of the charge pump high-voltage generating circuit 9 and the capacitance value of the first capacitor 12, and the voltage change frequency output by the output end 2 is smaller than the minimum audio frequency 20Hz visible by human ears, so that starting-up noise is eliminated.
It should be noted that, the charge pump high voltage generating circuit 9 and the first capacitor 12 cooperate to generate a slow control signal for the gate voltage of the first switch 3, but the specific implementation manner is not limited to the above-mentioned scheme, and any implementation manner can be considered as being within the protection scope of the present utility model as long as the implementation manner of the turn-on circuit of the first switch 3 gate control manner of the sub-audio is realized.
In order to realize the reset control, the protection circuit shown in fig. 1 may further include an audio power amplifier reset control circuit 14, where the audio power amplifier reset control circuit 14 is connected with the debounce circuit 8 and the audio power amplifier circuit;
when the start-up protection action signal is received, the audio power amplifier reset control circuit 14 outputs an audio power amplifier reset signal Rst to the audio power amplifier circuit to set the audio power amplifier circuit in the reset mode so that no audio output is provided,
when the end protection action signal is received, the charge pump high-voltage generating circuit 9 controls the first switch 3 to be closed, and after the output voltage of the output end 2 reaches the normal range, the audio power amplifier reset control circuit 14 stops outputting the audio power amplifier reset signal, and the reset enable of the audio power amplifier circuit is utilized to eliminate starting noise.
As shown in fig. 2, which is a circuit diagram of a protection circuit of an audio power amplifier according to a second embodiment of the present utility model, unlike fig. 1, the charge pump high voltage generation circuit 9 in fig. 1 is replaced by a high voltage power supply 15 and a waveform generator 16 which are connected to each other, and the waveform generator 16 may be formed of, for example, a timer and a digital-to-analog converter to generate a desired slow rising signal. Since Nmos switching tubes are used, their control voltage requires a high voltage power supply that is higher than the input power supply voltage.
As shown in fig. 3, which is a circuit diagram of a protection circuit of an audio power amplifier according to a third embodiment of the present utility model, unlike in fig. 1 and 2, the protection circuit of the audio power amplifier according to the present embodiment is connected to a plurality of audio power amplifier circuits, each corresponding to one of the channels, and the protection circuit of the audio power amplifier includes a front-end circuit and a plurality of back-end circuits, and it can be seen from comparison of fig. 1 to 3 that the input end, the voltage dividing circuit, the fast comparator, the current detecting circuit, the temperature detecting circuit, and the jitter removing circuit form the front-end circuit, and the output end, the first switch, the charge pump high-voltage generating circuit, the inverter, the second switch, the first capacitor, and the first zener diode form the back-end circuit, and each back-end circuit is connected to one of the audio power amplifier circuits.
Fig. 4 is a working flow chart of a protection circuit of an audio power amplifier, which is provided by the utility model, after an input end is electrified, the voltage detected by a voltage division circuit, the current detected by a current detection circuit and the temperature detected by a temperature detection circuit are continuously monitored, and whether various values are in a normal range is judged, so that a judgment result of whether protection is started or whether the protection is in a normal working state is obtained.
When the start protection action signal is received, a switch control circuit is used for controlling the first switch to be rapidly cut off, and the voltage input by the output end is closed. The switching delay, the output current and other parameter settings of the switching control circuit are matched with the power decoupling capacitance value in the audio power amplifier circuit, so that the maximum overvoltage generated at the output end is smaller than the maximum withstand voltage of the audio power amplifier, and the audio power amplifier is protected from being broken down by high voltage.
When the action signal entering the normal working state is received, the switch is slowly closed by the switch control circuit, and the rising speed of the output voltage is controlled, so that the equivalent maximum output frequency is smaller than the lowest frequency visible by human ears, and the power-on noise can not be generated at the output end of the audio power amplifier.
Alternatively, after receiving the action signal for entering the normal working state, the switch control circuit keeps resetting the audio power amplifier, closes the switch, and releases the reset of the audio power amplifier after waiting for the output power supply voltage to enter the normal working range, and starts the audio power amplifier, so that the power-on reset function of the audio power amplifier can be utilized to eliminate noise signals.
The protection circuit of the audio power amplifier provided by the utility model can monitor the input voltage and current of the audio power amplifier circuit in real time, and when the monitored voltage or current exceeds a preset value, the protection action is started to cut off the power supply of the audio power amplifier circuit, so that the audio power amplifier circuit is effectively protected.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the utility model.
Those of ordinary skill in the art will appreciate that: the modules in the apparatus of the embodiments may be distributed in the apparatus of the embodiments according to the description of the embodiments, or may be located in one or more apparatuses different from the present embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (4)
1. A protection circuit for an audio power amplifier connected to an audio power amplifier circuit, comprising: input, output, first switch, bleeder circuit, fast comparator, current detection circuit, temperature detection circuit, remove shake circuit, charge pump high voltage generation circuit, inverter, second switch, first electric capacity and first zener diode, wherein:
the first switch is connected between the input end and the output end, and is an nmos tube;
the input end is connected with a power supply, and the power supply is provided with an input voltage;
the rapid comparator is connected between the voltage dividing circuit and the jitter removing circuit, and the jitter removing circuit detects the voltage output by the voltage dividing circuit and compares the voltage with a reference voltage;
the current detection circuit detects the current magnitude of the input end and the output end and compares the current magnitude with a preset current range value;
the temperature detection circuit detects the temperature inside the circuit and compares the temperature with a preset temperature range;
when at least one of the voltage detected by the voltage dividing circuit, the current detected by the current detecting circuit and the temperature detected by the temperature detecting circuit is abnormal, the voltage, the current and the temperature detected by the voltage dividing circuit pass through the jitter removing circuit to reduce possible false judgment, and then a starting protection action signal is output;
the inverter is connected between the debounce circuit and the second switch, when the starting protection action signal is received, the inverter buffers and amplifies the starting protection action signal and outputs the starting protection action signal to the second switch, the second switch is an nmos tube, the charge pump high-voltage generating circuit is connected with the output end of the debounce circuit, the grid electrode of the first switch and the drain electrode of the second switch, and the grid electrode voltage of the first switch is reduced to the ground level and is disconnected so as to cut off the voltage input by the input end;
the first capacitor is connected between the grid electrode of the first switch and the ground, and the first zener diode is connected between the grid electrode of the first switch and the output end;
when an action signal entering a normal working state is received, the charge pump high-voltage generating circuit generates an extremely small current signal, the current signal is slowly integrated on the first capacitor, so that the gate voltage of the first switch is slowly increased, a preset proportional relation exists between the output current value of the charge pump high-voltage generating circuit and the capacitance value of the first capacitor, and the voltage change frequency output by the output end is smaller than the minimum audio frequency of 20Hz visible by human ears, so that starting-up noise is eliminated.
2. The protection circuit of an audio power amplifier according to claim 1, further comprising an audio power amplifier reset control circuit,
the audio power amplifier reset control circuit is connected with the jitter removing circuit and the audio power amplifier circuit;
when receiving the start-up protection action signal, the audio power amplifier reset control circuit outputs an audio power amplifier reset signal to the audio power amplifier circuit so as to set the audio power amplifier circuit in a reset mode, so that the audio power amplifier circuit does not have audio output,
when the protection action signal is received, the charge pump high-voltage generation circuit controls the first switch to be closed, and after the output voltage of the output end reaches a normal range, the audio power amplifier reset control circuit stops outputting an audio power amplifier reset signal, and starting-up noise is eliminated by using the reset enable of the audio power amplifier circuit.
3. The protection circuit of an audio power amplifier according to claim 1, wherein the charge pump high voltage generation circuit is replaced by a high voltage power supply and a waveform generator connected to each other.
4. The protection circuit of the audio power amplifier according to claim 1, wherein the protection circuit of the audio power amplifier is connected to a plurality of audio power amplifier circuits, each audio power amplifier circuit corresponds to one of the audio channels, the protection circuit of the audio power amplifier comprises a front-end circuit and a plurality of back-end circuits, the input terminal, the voltage dividing circuit, the fast comparator, the current detecting circuit, the temperature detecting circuit, and the debounce circuit form the front-end circuit, the output terminal, the first switch, the charge pump high voltage generating circuit, the inverter, the second switch, the first capacitor, and the first zener diode form the back-end circuit, and each back-end circuit is connected to one of the audio power amplifier circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310281163.0A CN116707460B (en) | 2023-03-14 | 2023-03-14 | Protection circuit of audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310281163.0A CN116707460B (en) | 2023-03-14 | 2023-03-14 | Protection circuit of audio power amplifier |
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| CN116707460A true CN116707460A (en) | 2023-09-05 |
| CN116707460B CN116707460B (en) | 2024-01-23 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN116707460B (en) | 2024-01-23 |
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