CN220915260U - Power amplifier output protection circuit - Google Patents
Power amplifier output protection circuit Download PDFInfo
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- CN220915260U CN220915260U CN202322574088.5U CN202322574088U CN220915260U CN 220915260 U CN220915260 U CN 220915260U CN 202322574088 U CN202322574088 U CN 202322574088U CN 220915260 U CN220915260 U CN 220915260U
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- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000005669 field effect Effects 0.000 claims description 81
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000002265 prevention Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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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Abstract
The utility model provides a power amplifier output protection circuit which comprises a control module, a detection module and a switch module, wherein the switch module is connected between an input end of a sound box and an output end of an audio amplifier, the detection module is connected between the output end of the audio amplifier and the control module, and the control module is connected with a control end of the switch module. The utility model can effectively improve the circuit safety.
Description
Technical Field
The utility model relates to the technical field of sound boxes, in particular to an output protection circuit of a power amplifier.
Background
The loudspeaker box connected with the audio power amplifier is generally expensive, and when the audio power amplifier circuit fails, the output end direct current voltage of the audio power amplifier circuit often deviates from zero level, and higher positive or negative direct current voltage appears. If the power amplifier and the sound box are not cut off in time, direct current voltage flows into the sound box to burn the loudspeaker, and the working points of all stages of amplifying circuits of the amplifier are not established at the moment of power on, so that the circuit can output an impact POP sound, and the POP sound can burn the sound box.
Disclosure of utility model
In order to solve the problems in the prior art, the utility model aims to provide a power amplifier output protection circuit so as to solve the problem that the sound equipment in the prior art is easy to burn.
The utility model provides the following technical scheme:
the power amplifier output protection circuit comprises a control module, a detection module and a switch module, wherein the switch module is connected between an input end of a sound box and an output end of an audio amplifier, the detection module is connected between the output end of the audio amplifier and the control module, and the control module is connected with a control end of the switch module.
Preferably, the control module comprises a control chip U1, and a control input module and a control output module which are connected with the control chip U1, wherein the control input module is also connected with the detection module, and the control output module is also connected with the switch module.
Preferably, the control input module comprises a triode Q5 and a triode Q6, wherein a base electrode of the triode Q5 is connected with the detection module, a collector electrode of the triode is connected with the base electrode of the triode Q6, the collector electrode of the triode Q6 is connected between a pin 4 of the control chip U1 and a power supply end, and an emitting electrode of the triode Q6 is grounded.
Preferably, the control output module comprises a triode Q9, an optocoupler U2 and an optocoupler U3, wherein a base electrode of the triode Q9 is connected with a pin 3 of the control chip U1, an emitter electrode of the triode Q9 is grounded, a collector electrode of the triode Q9 is connected with a cathode of a light emitting diode of the optocoupler U3, an anode of the light emitting diode of the optocoupler U2 is connected with circuit voltage, a cathode of the light emitting diode of the optocoupler U2 is connected with an anode of the light emitting diode of the optocoupler U3, a cathode of the light emitting diode of the optocoupler U3 is connected with the collector electrode of the triode Q9, and collector electrodes and an emitter electrode of the optocoupler U2 and the optocoupler U3 are both connected with the switch module.
Preferably, the switch module comprises a left channel switch control module, the left channel switch control module comprises a field effect tube Q1 and a field effect tube Q2, a source electrode of the field effect tube Q1 is connected with an output end of the audio amplifier, a grid electrode of the field effect tube Q1 is connected with a collector electrode of the optocoupler U2, a drain electrode of the field effect tube Q1 is connected with a drain electrode of the field effect tube Q2, a source electrode of the field effect tube Q2 is connected with an input end of the loudspeaker box, a grid electrode of the field effect tube Q2 is connected with a collector electrode of the optocoupler U2, and an emitter electrode of the optocoupler U2 is connected between the drain electrode of the field effect tube Q1 and a drain electrode of the field effect tube Q2.
Preferably, the switch module comprises a right channel switch control module, the right channel switch control module comprises a field effect tube Q7 and a field effect tube Q8, a source electrode of the field effect tube Q7 is connected with an output end of the audio amplifier, a grid electrode of the field effect tube Q7 is connected with a collector electrode of the optocoupler U3, a drain electrode of the field effect tube Q7 is connected with a drain electrode of the field effect tube Q3, a source electrode of the field effect tube Q8 is connected with an input end of the loudspeaker box, a grid electrode of the field effect tube Q8 is connected with a collector electrode of the optocoupler U3, and an emitter electrode of the optocoupler U3 is connected between the drain electrode of the field effect tube Q7 and a drain electrode of the field effect tube Q8.
Preferably, the detection module comprises a left channel detection control module, the left channel detection control module comprises a triode Q13, a base electrode of the triode Q13 is connected with an output end of the audio amplifier, a collector electrode of the triode Q13 is connected with a base electrode of the triode Q5, an emitter electrode of the triode Q13 is connected with an anode of a diode D6, and a cathode of the diode D6 is grounded.
Preferably, the detection module comprises a right channel detection control module, the right channel detection control module comprises a triode Q3, a base electrode of the triode Q3 is connected with an output end of the audio amplifier, a collector electrode of the triode Q3 is connected with a base electrode of the triode Q5, an emitter electrode of the triode Q3 is connected with an anode of a diode D8, and a cathode of the diode D8 is grounded.
Preferably, the control module further comprises a delay starting module, the delay starting module comprises a capacitor C1 and a resistor R17, one end of the capacitor C1 is connected with a power supply end, the other end of the capacitor C1 is connected with a pin 6, a pin 2 and the resistor R17 of the control chip U1, and the other end of the resistor R17 is grounded.
Preferably, the audio amplifier further comprises a self-excitation prevention module, and the self-excitation prevention module is connected between the output end of the audio amplifier and the switch module.
The embodiment of the utility model has the following beneficial effects:
The power amplifier output protection circuit comprises a control module, a detection module and a switch module, wherein the switch module is connected between the input end of the sound box and the output end of the audio amplifier, the detection module is connected between the output end of the audio amplifier and the control module, and the control module is connected with the control end of the switch module. According to the utility model, the power amplifier output protection circuit is arranged between the audio amplifier and the sound box, the current and the voltage between the audio amplifier and the sound box are detected by the detection module and then fed back to the control module to control the on/off of the switch module, so that the on/off of a loop between the audio amplifier and the sound box is controlled, the purpose of protecting the sound box from being burnt easily is achieved, and the safety is improved.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic diagram of a principle structure of an output protection circuit of a power amplifier according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a control module of an output protection circuit of a power amplifier according to an embodiment of the present utility model.
Fig. 3 is a schematic diagram of a detection module of an output protection circuit of a power amplifier according to an embodiment of the present utility model.
Fig. 4 is a schematic structural diagram of a switch module of a power amplifier output protection circuit according to an embodiment of the present utility model.
Fig. 5 shows a schematic diagram of a self-excitation preventing module of an output protection circuit of a power amplifier according to an embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
Referring to fig. 1 to 5, the present utility model provides a power amplifier output protection circuit, which includes a control module 10, a detection module 20 and a switch module 30, wherein the switch module 30 is connected between an input end of a sound box and an output end of an audio amplifier, the detection module 20 is connected between the output end of the audio amplifier and the control module, and the control module 10 is connected with a control end of the switch module 30.
According to the utility model, the power amplifier output protection circuit is arranged between the audio amplifier and the sound box, the current and the voltage between the audio amplifier and the sound box are detected by the detection module and then fed back to the control module to control the on/off of the switch module, so that the on/off of a loop between the audio amplifier and the sound box is controlled, the purpose of protecting the sound box from being burnt easily is achieved, and the safety is improved.
As a further alternative scheme of the power amplifier output protection circuit, the control module comprises a control chip U1, and a control input module and a control output module which are connected with the control chip U1, wherein the control input module is also connected with the detection module, and the control output module is also connected with the switch module.
Specifically, the model of the control chip U1 is NE555, which is an 8-pin time base integrated circuit chip.
As a further alternative scheme of the power amplifier output protection circuit, the control input module comprises a triode Q5 and a triode Q6, the base electrode of the triode Q5 is connected with the detection module, the collector electrode of the triode is connected with the base electrode of the triode Q6, the collector electrode of the triode Q6 is connected between the pin 4 of the control chip U1 and the power supply end, and the emitter electrode of the triode Q6 is grounded.
As a further alternative scheme of the power amplifier output protection circuit, the control output module comprises a triode Q9, an optical coupler U2 and an optical coupler U3, wherein a base electrode of the triode Q9 is connected with a pin 3 of the control chip U1, an emitter electrode of the triode Q9 is grounded, a collector electrode of the triode Q9 is connected with a cathode of a light emitting diode of the optical coupler U3, an anode of the light emitting diode of the optical coupler U2 is connected with circuit voltage, a cathode of the light emitting diode of the optical coupler U2 is connected with an anode of the light emitting diode of the optical coupler U3, a cathode of the light emitting diode of the optical coupler U3 is connected with a collector electrode of the triode Q9, and a collector electrode and an emitter electrode of the optical coupler U2 and the optical coupler U3 are both connected with the switch module.
Specifically, triode Q5 is PNP triode, triode Q6 is NPN triode, triode Q5's base still is connected with resistance R6, still be connected with resistance R7 between triode Q5's projecting pole and the base, electric capacity C1 and resistance R1 and control chip U1's pin 8 are still connected to triode Q5's collecting electrode, resistance R8's the other end is connected with resistance R9, triode Q6's base is connected between resistance R8 and resistance R9, resistance R9's the other end ground connection, be connected with resistance R12 between triode Q6's collecting electrode and the 5V power supply end, control chip U1's pin 4 is connected between triode Q6's collecting electrode and resistance R9, light-emitting diode's of opto-coupler U2 positive pole is connected with resistance R1, control chip U1's pin 8 is connected to resistance R1's the other end, still be connected with resistance R18 between control chip U1's pin 3 and triode Q9's the base.
As a further alternative scheme of the power amplifier output protection circuit, the switch module comprises a left channel switch control module, the left channel switch control module comprises a field effect transistor Q1 and a field effect transistor Q2, a source electrode of the field effect transistor Q1 is connected with an output end of the audio amplifier, a gate electrode of the field effect transistor Q1 is connected with a collector electrode of the optocoupler U2, a drain electrode of the field effect transistor Q1 is connected with a drain electrode of the field effect transistor Q2, a source electrode of the field effect transistor Q2 is connected with an input end of the loudspeaker box, a gate electrode of the field effect transistor Q2 is connected with a collector electrode of the optocoupler U2, and an emitter electrode of the optocoupler U2 is connected between the drain electrode of the field effect transistor Q1 and the drain electrode of the field effect transistor Q2.
As a further alternative scheme of the power amplifier output protection circuit, the switch module comprises a right channel switch control module, the right channel switch control module comprises a field effect transistor Q7 and a field effect transistor Q8, a source electrode of the field effect transistor Q7 is connected with an output end of the audio amplifier, a gate electrode of the field effect transistor Q7 is connected with a collector electrode of the optocoupler U3, a drain electrode of the field effect transistor Q7 is connected with a drain electrode of the field effect transistor Q3, a source electrode of the field effect transistor Q8 is connected with an input end of the loudspeaker box, a gate electrode of the field effect transistor Q8 is connected with a collector electrode of the optocoupler U3, and an emitter electrode of the optocoupler U3 is connected between the drain electrode of the field effect transistor Q7 and a drain electrode of the field effect transistor Q8.
As a further alternative scheme of the power amplifier output protection circuit, the detection module comprises a left channel detection control module, the left channel detection control module comprises a triode Q13, a base electrode of the triode Q13 is connected with an output end of the audio amplifier, a collector electrode of the triode Q13 is connected with a base electrode of a triode Q5, an emitter electrode of the triode Q13 is connected with an anode of a diode D6, and a cathode of the diode D6 is grounded.
Specifically, the left channel detection control module further includes a resistor R2, a resistor R10, a resistor R11, a triode Q14, a diode D4, and a diode D1. The left channel detection control module further comprises a left channel filtering module, wherein the left channel filtering module comprises a capacitor C2 and a capacitor C3, and can filter alternating current. One end of the resistor R2 is connected between the output end of the audio amplifier and the field effect transistor Q1, the other end of the resistor R2 is connected with the resistor R10, the negative electrode of the diode D4 and the capacitor C2, the other end of the capacitor C2 is connected with the capacitor C3, the other end of the capacitor C3 is grounded, the other end of the resistor R10 is connected with the base electrode of the triode Q13, the positive electrode of the diode D4 is connected with the emitter electrode of the triode Q14, the base electrode of the triode Q14 is connected with the resistor R11, the other end of the resistor R11 is connected with the negative electrode of the capacitor C3 and the negative electrode of the diode D6 and grounded, the collector electrode of the triode Q14 is connected with the collector electrode of the triode Q13 and the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the resistor R6.
As a further alternative scheme of the power amplifier output protection circuit, the detection module comprises a right channel detection control module, the right channel detection control module comprises a triode Q3, a base electrode of the triode Q3 is connected with an output end of the audio amplifier, a collector electrode of the triode Q3 is connected with a base electrode of the triode Q5, an emitter electrode of the triode Q3 is connected with an anode of a diode D8, and a cathode of the diode D8 is grounded.
Specifically, the right channel detection control module further includes a resistor R3, a resistor R4, a resistor R5, a triode Q4, a diode D9, and a diode D2. The left sound channel detection control module further comprises a right sound channel filtering module, and the right sound channel filtering module comprises a capacitor C5 and a capacitor C6 and can filter alternating current. One end of the resistor R3 is connected between the output end of the audio amplifier and the field effect transistor Q7, the other end of the resistor R3 is connected with the resistor R4, the negative electrode of the diode D9 and the capacitor C5, the other end of the capacitor C5 is connected with the capacitor C6, the other end of the capacitor C6 is grounded, the other end of the resistor R5 is connected with the base electrode of the triode Q3, the positive electrode of the diode D9 is connected with the emitter electrode of the triode Q4, the base electrode of the triode Q4 is connected with the resistor R5, the other end of the resistor R5 is connected with the capacitor C6, the negative electrode of the diode D9 and grounded, the collector electrode of the triode Q4 is connected with the collector electrode of the triode Q3 and the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected with the resistor R6.
As a further alternative scheme of the power amplifier output protection circuit, the control module further comprises a delay starting module, the delay starting module comprises a capacitor C1 and a resistor R17, one end of the capacitor C1 is connected with a power supply end, the other end of the capacitor C1 is connected with a pin 6, a pin 2 and the resistor R17 of the control chip U1, and the other end of the resistor R17 is grounded.
As a further alternative to the power amplifier output protection circuit, the power amplifier output protection circuit further comprises a self-excitation prevention module 40, and the self-excitation prevention module 40 is connected between the output end of the audio amplifier and the switch module.
Specifically, the anti-self-excitation module comprises a left sound channel safety module and a right sound channel safety module, the left sound channel safety module comprises an inductor L2, a resistor R14, a resistor R13 and a capacitor C7, one end of the resistor R14 is connected with the output end of the audio amplifier, the other end of the resistor R14 is connected with the source electrode of the field effect transistor Q1, the inductor L2 is connected in parallel with the two ends of the resistor R14, the resistor R13 is connected between the resistor R14 and the output end of the audio amplifier, and the other end of the resistor R13 is connected with the capacitor C7. The right sound channel safety module comprises an inductor L1, a resistor R16, a resistor R15 and a capacitor C8, wherein the resistor R16 is connected between the output end of the audio amplifier and the source electrode of the field effect transistor Q7, the inductor L1 is connected in parallel with the two ends of the resistor R16, one end of the resistor R15 is connected between the resistor R16 and the output end of the audio amplifier, and the other end of the resistor R15 is connected with the capacitor C8. The self-excitation of the circuit can be effectively prevented from damaging the field effect transistor and other circuit components.
It should be noted that the utility model has the function of starting-up delay protection, and the general delay is about 5-8 seconds. Specifically, the delay starting module is composed of a control chip U1, a resistor R17 and a capacitor C1, the delay time is determined by the time constants of the resistor R17 and the capacitor C1, and the time of the 3-pin output of the control chip U1 can be changed by changing the values of the two elements. At the moment of power-on, as the voltage at the two ends of the capacitor C1 cannot be suddenly changed, the 3-pin output end of the control chip U1 outputs a low level, the triode Q9 is not conducted, the two optocouplers U2 and the light-emitting diodes of the optocoupler U3 do not output voltage, the two optocouplers do not output voltage, the field effect tube Q1, the field effect tube Q2, the field effect tube Q7 and the field effect tube Q8 of the switch module are not conducted, and the loop from the audio amplifier to the loudspeaker box is cut off, so that the starting-up impact sound is prevented. When the capacitor C1 is fully charged, the 3-pin output end of the control chip U1 outputs high level at the moment, and the driving triode Q9 is conducted, so that the two optocouplers U2 and the optocoupler U3 output voltage are driven to conduct the field effect tube Q1, the field effect tube Q2, the field effect tube Q7 and the field effect tube Q8 of the switch module, and the loop from the audio amplifier to the sound box is conducted at the moment.
When the circuit of the utility model fails and the DC voltage at the output end of the audio amplifier exceeds the set value, the voltage becomes a control signal which is fed back to the control chip U1, so that the control chip U1 selectively controls the cut-off/on of the switch module to cut off/on the loop of the power amplifier and the sound box, thereby protecting the sound box. The threshold voltage set by the utility model is +/-1.2V, and the threshold voltage can be adjusted to +/-0.6V by removing the diode D4, the diode D6, the diode D8 and the diode D9.
Specifically, for the left channel: when the output L_AMP_IN of the power amplifier outputs positive voltage, when the set voltage value is exceeded, the triode Q13 is conducted, the triode Q5 is conducted, and the triode Q6 is conducted, so that the pin 4 of the control chip U1 is pulled down, the control chip U1 controls the pin 3 of the control chip U1 to output low level according to the received signal, so that the triode Q9 is cut off, the circuits of the optocoupler U2 and the optocoupler U3 are cut off, the optocoupler U2 and the optocoupler U3 have no output voltage, the field effect transistor Q1, the field effect transistor Q2, the field effect transistor Q7 and the field effect transistor Q8 are not cut off, and the circuit from the output end of the audio amplifier to the sound box is cut off. When the output L_AMP_IN of the power amplifier is output with negative voltage, when the set voltage value is exceeded, the triode Q14 is conducted, the triode Q5 is conducted, and the triode Q6 is conducted, so that the pin 4 of the control chip U1 is pulled down, the pin 3 of the control chip U1 outputs low level, the triode Q9 is cut off, the optocoupler U2 and the optocoupler U3 have no output voltage, the field effect transistor Q1, the field effect transistor Q2, the field effect transistor Q7 and the field effect transistor Q8 are not cut off, and a loop from the output end of the audio amplifier to the sound box is cut off. Similarly, the right channel operates on the same principle as the left channel.
The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (10)
1. The power amplifier output protection circuit is characterized by comprising a control module, a detection module and a switch module, wherein the switch module is connected between an input end of a sound box and an output end of an audio amplifier, the detection module is connected between the output end of the audio amplifier and the control module, and the control module is connected with a control end of the switch module.
2. The power amplifier output protection circuit according to claim 1, wherein the control module comprises a control chip U1, and a control input module and a control output module connected with the control chip U1, the control input module is further connected with the detection module, and the control output module is further connected with the switch module.
3. The power amplifier output protection circuit according to claim 2, wherein the control input module comprises a triode Q5 and a triode Q6, a base electrode of the triode Q5 is connected with the detection module, a collector electrode of the triode is connected with the base electrode of the triode Q6, a collector electrode of the triode Q6 is connected between a pin 4 of the control chip U1 and a power supply end, and an emitter electrode of the triode Q6 is grounded.
4. The power amplifier output protection circuit according to claim 2, wherein the control output module comprises a triode Q9, an optocoupler U2 and an optocoupler U3, a base electrode of the triode Q9 is connected with a pin 3 of the control chip U1, an emitter electrode of the triode Q9 is grounded, a collector electrode of the triode Q9 is connected with a cathode electrode of a light emitting diode of the optocoupler U3, an anode electrode of the light emitting diode of the optocoupler U2 is connected with a circuit voltage, a cathode electrode of the light emitting diode of the optocoupler U2 is connected with an anode electrode of the light emitting diode of the optocoupler U3, a cathode electrode of the light emitting diode of the optocoupler U3 is connected with a collector electrode of the triode Q9, and collector electrodes and an emitter electrode of the optocoupler U2 and the optocoupler U3 are both connected with the switch module.
5. The power amplifier output protection circuit according to claim 4, wherein the switch module comprises a left channel switch control module, the left channel switch control module comprises a field effect transistor Q1 and a field effect transistor Q2, a source electrode of the field effect transistor Q1 is connected with an output end of the audio amplifier, a gate electrode of the field effect transistor Q1 is connected with a collector electrode of the optocoupler U2, a drain electrode of the field effect transistor Q1 is connected with a drain electrode of the field effect transistor Q2, a source electrode of the field effect transistor Q2 is connected with an input end of the sound box, a gate electrode of the field effect transistor Q2 is connected with a collector electrode of the optocoupler U2, and an emitter electrode of the optocoupler U2 is connected between the drain electrode of the field effect transistor Q1 and the drain electrode of the field effect transistor Q2.
6. The power amplifier output protection circuit according to claim 4, wherein the switch module comprises a right channel switch control module, the right channel switch control module comprises a field effect transistor Q7 and a field effect transistor Q8, a source electrode of the field effect transistor Q7 is connected with an output end of the audio amplifier, a gate electrode of the field effect transistor Q7 is connected with a collector electrode of the optocoupler U3, a drain electrode of the field effect transistor Q7 is connected with a drain electrode of the field effect transistor Q3, a source electrode of the field effect transistor Q8 is connected with an input end of the sound box, a gate electrode of the field effect transistor Q8 is connected with a collector electrode of the optocoupler U3, and an emitter electrode of the optocoupler U3 is connected between the drain electrode of the field effect transistor Q7 and a drain electrode of the field effect transistor Q8.
7. The power amplifier output protection circuit according to claim 3, wherein the detection module comprises a left channel detection control module, the left channel detection control module comprises a triode Q13, a base electrode of the triode Q13 is connected with an output end of the audio amplifier, a collector electrode of the triode Q13 is connected with a base electrode of the triode Q5, an emitter electrode of the triode Q13 is connected with an anode of a diode D6, and a cathode of the diode D6 is grounded.
8. The power amplifier output protection circuit according to claim 3, wherein the detection module comprises a right channel detection control module, the right channel detection control module comprises a triode Q3, a base electrode of the triode Q3 is connected with an output end of the audio amplifier, a collector electrode of the triode Q3 is connected with a base electrode of the triode Q5, an emitter electrode of the triode Q3 is connected with an anode of a diode D8, and a cathode of the diode D8 is grounded.
9. The power amplifier output protection circuit according to claim 2, wherein the control module further comprises a delay starting module, the delay starting module comprises a capacitor C1 and a resistor R17, one end of the capacitor C1 is connected with a power supply end, the other end of the capacitor C1 is connected with a pin 6, a pin 2 and the resistor R17 of the control chip U1, and the other end of the resistor R17 is grounded.
10. The power amplifier output protection circuit of claim 1, further comprising a self-excitation prevention module connected between the audio amplifier output and the switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322574088.5U CN220915260U (en) | 2023-09-21 | 2023-09-21 | Power amplifier output protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322574088.5U CN220915260U (en) | 2023-09-21 | 2023-09-21 | Power amplifier output protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220915260U true CN220915260U (en) | 2024-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322574088.5U Active CN220915260U (en) | 2023-09-21 | 2023-09-21 | Power amplifier output protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220915260U (en) |
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2023
- 2023-09-21 CN CN202322574088.5U patent/CN220915260U/en active Active
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