CN211406263U - Computer loudspeaker protection circuit - Google Patents
Computer loudspeaker protection circuit Download PDFInfo
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- CN211406263U CN211406263U CN201922245932.3U CN201922245932U CN211406263U CN 211406263 U CN211406263 U CN 211406263U CN 201922245932 U CN201922245932 U CN 201922245932U CN 211406263 U CN211406263 U CN 211406263U
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Abstract
The utility model discloses a computer loudspeaker protection circuit, including power amplifier circuit, signal hybrid circuit, direct current detection circuitry, drive circuit, transistor switch circuit, switch protection circuit and execution circuit, power amplifier circuit is used for being connected with the speaker electricity, signal hybrid circuit with power amplifier circuit's signal output part reaches direct current detection circuitry electricity is connected, direct current detection circuitry with signal hybrid circuit's output reaches the drive circuit electricity is connected, drive circuit with transistor switch circuit electricity is connected, transistor switch circuit is connected with the execution circuit electricity, switch protection circuit with transistor switch circuit electricity is connected, execution circuit with power amplifier circuit's signal output part electricity is connected. The utility model discloses the electric potential skew takes place in having reduced power amplifier output betterly, damages the probability of speaker easily when DC voltage appears.
Description
Technical Field
The utility model relates to a speaker protection technical field, in particular to computer speaker protection circuit.
Background
The loudspeaker is a transducer for converting an electric signal into an acoustic signal, and the quality of the loudspeaker has great influence on the sound quality. The loudspeaker is the weakest component in the audio equipment, and is the most important component for the audio effect. Loudspeakers are of a wide variety and vary widely in price. The audio frequency electric energy makes the cone or diaphragm vibrate and generate resonance with the surrounding air to make sound through electromagnetic, piezoelectric or electrostatic effect. However, when a potential shift occurs in the output of the power amplifier, the speaker is easily damaged when a direct-current voltage occurs.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be, provide a computer speaker protection circuit, reduced the power amplifier output better and taken place the current potential skew, damage the probability of speaker easily when DC voltage appears.
The utility model provides a computer loudspeaker protection circuit, including power amplification circuit, signal mixing circuit, direct current detection circuitry, drive circuit, transistor switch circuit, switch protection circuit and execution circuit, power amplification circuit is used for being connected with the speaker electricity to send to after amplifying the audio signal of input for the speaker; the signal mixing circuit is electrically connected with the signal output end of the power amplifying circuit and the direct current detection circuit and is used for mixing the signals output by the power amplifying circuit; the direct current detection circuit is electrically connected with the output end of the signal mixing circuit and the drive circuit and is used for detecting the signal output by the signal mixing circuit;
the driving circuit is electrically connected with the transistor switch circuit and is used for controlling the transistor switch circuit to be switched on or switched off according to the signal output by the direct current detection circuit; the transistor switch circuit is electrically connected with the execution circuit and is used for controlling the execution circuit to work; the switch protection circuit is electrically connected with the transistor switch circuit and used for protecting the transistor switch circuit; the execution circuit is electrically connected with the signal output end of the power amplification circuit and is used for controlling whether the loudspeaker works or not.
Preferably, the power amplifying circuit comprises a first power amplifier and a second power amplifier, and a signal output end of the first power amplifier and a signal output end of the second power amplifier are both electrically connected to the signal mixing circuit; the loudspeaker comprises a first loudspeaker and a second loudspeaker, and the first power amplifier is used for receiving a first audio signal, amplifying the first audio signal and then sending the amplified first audio signal to the first loudspeaker; the second power amplifier is used for receiving a second audio signal, amplifying the second audio signal and then sending the amplified second audio signal to the second loudspeaker.
Preferably, the signal mixing circuit includes a first resistor and a second resistor, a first end of the first resistor is electrically connected to the signal output end of the second power amplifier, and a second end of the first resistor is electrically connected to a second end of the second resistor; the first end of the second resistor is electrically connected with the signal output end of the first power amplifier, and the second end of the second resistor is electrically connected with the direct current detection circuit.
Preferably, the dc detection circuit includes a first capacitor, a second capacitor, a third resistor, a first triode, and a rectifier circuit unit, wherein a first end of the first capacitor is electrically connected to a second end of the second resistor, a second end of the first capacitor is electrically connected to a first end of the second capacitor, and a second end of the second capacitor is grounded; the first end of the rectifying circuit unit is electrically connected with the second end of the second resistor, the second end of the rectifying circuit unit is electrically connected with the first end of the third resistor, and the second end of the third resistor is grounded; the base electrode of the first triode is electrically connected with the third end of the rectifying circuit unit, the emitting electrode of the first triode is electrically connected with the fourth end of the rectifying circuit unit, and the collecting electrode of the first triode is electrically connected with the signal input end of the driving circuit.
Preferably, the driving circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a second triode, a first end of the fourth resistor is electrically connected to a first end of the sixth resistor, and a second end of the fourth resistor is electrically connected to a collector of the first triode; a first end of the fifth resistor is connected with a second end of the fourth resistor, and a second end of the fifth resistor is electrically connected with a base electrode of the second triode; the second end of the sixth resistor is electrically connected with the collector of the second triode; and the emitter of the second triode is grounded.
Preferably, the transistor switch circuit comprises a seventh resistor and a first diode, wherein a first end of the seventh resistor is electrically connected with a second end of the sixth resistor, and a second end of the seventh resistor is electrically connected with a third pin of the first diode; the first end of the first diode is electrically connected with the switch protection circuit and the execution circuit, and the second end of the first diode is grounded.
Preferably, the switch protection circuit includes a second diode, a first end of the second diode is electrically connected to the first end of the sixth resistor, the first end of the second diode is further used for being electrically connected to a power supply, and a second end of the second diode is electrically connected to the first end of the first diode.
Preferably, the execution circuit comprises a relay, a first end of the relay is used for being electrically connected with the power supply, and a second end of the relay is electrically connected with a first end of the first diode; the first switch of the relay is electrically connected with the output end of the first power amplifier and the first loudspeaker, and the second switch of the relay is electrically connected with the output end of the second power amplifier and the second loudspeaker.
The utility model discloses following beneficial effect has: the utility model discloses a cooperation between power amplifier circuit, signal hybrid circuit, direct current detection circuitry, drive circuit, transistor switch circuit, switch protection circuit and the execution circuit, when direct current voltage appearing, cut off power amplifier circuit with the signal connection of speaker to take place the current potential skew in having reduced power amplifier output betterly, damaged the probability of speaker easily when direct current voltage appears.
Drawings
Fig. 1 is a schematic structural diagram of the computer speaker protection circuit of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples. It should be noted that, if there is no conflict, the embodiments and various features in the embodiments of the present invention may be combined with each other, and all are within the scope of the present invention.
Referring to fig. 1, the present invention provides a computer speaker protection circuit, which includes a power amplifier circuit 1, a signal mixing circuit 2, a dc detection circuit 3, a driving circuit 4, a switch protection circuit 5, a switch protection circuit 6, and an execution circuit 7, wherein the power amplifier circuit 1 is electrically connected to a speaker to amplify an input audio signal and then transmit the amplified audio signal to the speaker. The signal mixing circuit 2 is electrically connected with the signal output end of the power amplifying circuit 1 and the direct current detection circuit 3, and is used for mixing the signals output by the power amplifying circuit 1.
The dc detection circuit 3 is electrically connected to the output terminal of the signal mixing circuit 2 and the driving circuit 4, and is configured to detect a signal output by the signal mixing circuit 2 to detect whether there is a dc voltage. The driving circuit 4 is electrically connected to the switch protection circuit 5, and is configured to control the switch protection circuit 5 to be turned on or off according to a signal output by the dc detection circuit 3. The switch protection circuit 5 is electrically connected with the execution circuit 7 and is used for controlling the execution circuit 7 to work. The switch protection circuit 6 is electrically connected to the switch protection circuit 5, and is configured to protect the switch protection circuit 5. The execution circuit 7 is electrically connected with the signal output end of the power amplification circuit 1 and is used for controlling whether the loudspeaker works or not.
The power amplifier circuit 1 comprises a first power amplifier U1 and a second power amplifier U2, and a signal output terminal of the first power amplifier U1 and a signal output terminal of the second power amplifier U2 are both electrically connected to the signal mixing circuit 2. The loudspeaker comprises a first loudspeaker BP1 and a second loudspeaker BP2, and the first power amplifier U1 is used for receiving a first audio signal, amplifying the first audio signal and then sending the amplified first audio signal to the first loudspeaker BP 1. The second power amplifier U2 is configured to receive a second audio signal, amplify the second audio signal, and send the amplified second audio signal to the second speaker BP 2. In practical applications, the first speaker BP1 and the second speaker BP2 are respectively used as different sound channels.
The signal mixing circuit 2 comprises a first resistor R1 and a second resistor R2, wherein a first end of the first resistor R1 is electrically connected with a signal output end of the second power amplifier U2, and a second end of the first resistor R1 is electrically connected with a second end of the second resistor R2. A first end of the second resistor R2 is electrically connected to the signal output end of the first power amplifier U1, and a second end of the second resistor R2 is electrically connected to the dc detection circuit 3. The signal mixing circuit 2 has the advantages of simple structure and low cost.
The dc detection circuit 3 includes a first capacitor C1, a second capacitor C2, a third resistor R3, a first transistor Q1 and a rectifier circuit unit 31, wherein a first end of the first capacitor C1 is electrically connected to a second end of the second resistor R2, a second end of the first capacitor C1 is electrically connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is grounded. A first end of the rectifier circuit unit 31 is electrically connected to a second end of the second resistor R2, a second end of the rectifier circuit unit 31 is electrically connected to a first end of the third resistor R3, and a second end of the third resistor R3 is grounded. The base electrode of the first triode Q1 is electrically connected with the third end of the rectifying circuit unit 31, the emitter electrode of the first triode Q1 is electrically connected with the fourth end of the rectifying circuit unit 31, and the collector electrode of the first triode Q1 is electrically connected with the signal input end of the driving circuit 4. After the present embodiment, the first capacitor C1 and the second capacitor C2 are connected in series and in reverse to form a non-polar capacitor, so as to better filter out the ac component.
The driving circuit 4 comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a second triode Q2, wherein a first end of the fourth resistor R4 is electrically connected with a first end of the sixth resistor R6, and a second end of the fourth resistor R4 is electrically connected with a collector of the first triode Q1. A first end of the fifth resistor R5 is connected to a second end of the fourth resistor R4, and a second end of the fifth resistor R5 is electrically connected to the base of the second transistor Q2. The second end of the sixth resistor R6 is electrically connected to the collector of the second transistor Q2. The emitter of the second transistor Q2 is grounded.
The switch protection circuit 5 comprises a seventh resistor R7 and a first diode D1, wherein a first end of the seventh resistor R7 is electrically connected with a second end of the sixth resistor R6, and a second end of the seventh resistor R7 is electrically connected with a third pin of the first diode D1. A first terminal of the first diode D1 is electrically connected to the switch protection circuit 6 and the execution circuit 7, and a second terminal of the first diode D1 is grounded. In this embodiment, the first diode D1 is a thyristor. Compare triode switch, the utility model discloses a switch protection circuit 5 has simple structure and advantage with low costs.
The switch protection circuit 6 includes a second diode D2, a first end of the second diode D2 is electrically connected to a first end of the sixth resistor R6, a first end of the second diode D2 is further used for being electrically connected to a power supply, and a second end of the second diode D2 is electrically connected to a first end of the first diode D1.
The execution circuit 7 comprises a relay K, a first end of the relay K is used for being electrically connected with the power supply, and a second end of the relay K is electrically connected with a first end of the first diode D1. The first switch of the relay K is electrically connected with the output end of the first power amplifier U1 and the first loudspeaker BP1, and the second switch of the relay K is electrically connected with the output end of the second power amplifier U2 and the second loudspeaker BP 2. By providing the second diode D2, the thyristor can be prevented from being broken down by the back electromotive force generated when the coil of the relay K is deenergized. In the working process, if the first power amplifier U1 or the second power amplifier U2 generates direct current voltage, the first triode Q1 is conducted, the second triode Q2 is cut off, the thyristor is conducted, the relay K is attracted, the first switch and the second switch of the relay K are disconnected, and therefore the loudspeaker is protected.
To sum up, the utility model discloses a cooperation between power amplifier circuit, signal mixing circuit, direct current detection circuitry, drive circuit, transistor switch circuit, switch protection circuit and the execution circuit, when direct current voltage appearing, cut off power amplifier circuit with the signal connection of speaker to the probability of damaging the speaker easily when direct current voltage appears has reduced the electric potential skew in the power amplifier output betterly.
The computer speaker protection circuit provided by the present invention is introduced in detail, and the principle and the implementation of the present invention are explained by applying specific examples, and the explanation of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. To sum up, this description content only does the embodiment of the utility model, not therefore the restriction the patent scope of the utility model, all utilize the equivalent structure or the equivalent flow transform that the content of the description and the attached drawing was done, or directly or indirectly use in other relevant technical field, all the same reason is included in the patent protection scope of the utility model, should not be understood as right the utility model discloses a restriction.
Claims (8)
1. A computer loudspeaker protection circuit is characterized by comprising a power amplification circuit, a signal mixing circuit, a direct current detection circuit, a driving circuit, a transistor switch circuit, a switch protection circuit and an execution circuit, wherein the power amplification circuit is electrically connected with a loudspeaker so as to amplify an input audio signal and then send the amplified audio signal to the loudspeaker; the signal mixing circuit is electrically connected with the signal output end of the power amplifying circuit and the direct current detection circuit and is used for mixing the signals output by the power amplifying circuit; the direct current detection circuit is electrically connected with the output end of the signal mixing circuit and the drive circuit and is used for detecting the signal output by the signal mixing circuit;
the driving circuit is electrically connected with the transistor switch circuit and is used for controlling the transistor switch circuit to be switched on or switched off according to the signal output by the direct current detection circuit; the transistor switch circuit is electrically connected with the execution circuit and is used for controlling the execution circuit to work; the switch protection circuit is electrically connected with the transistor switch circuit and used for protecting the transistor switch circuit; the execution circuit is electrically connected with the signal output end of the power amplification circuit and is used for controlling whether the loudspeaker works or not.
2. The computer loudspeaker protection circuit of claim 1, wherein the power amplifier circuit comprises a first power amplifier and a second power amplifier, and a signal output terminal of the first power amplifier and a signal output terminal of the second power amplifier are both electrically connected to the signal mixing circuit; the loudspeaker comprises a first loudspeaker and a second loudspeaker, and the first power amplifier is used for receiving a first audio signal, amplifying the first audio signal and then sending the amplified first audio signal to the first loudspeaker; the second power amplifier is used for receiving a second audio signal, amplifying the second audio signal and then sending the amplified second audio signal to the second loudspeaker.
3. The computer loudspeaker protection circuit of claim 2, wherein the signal mixing circuit comprises a first resistor, a second resistor, a first end of the first resistor being electrically connected to the signal output of the second power amplifier, a second end of the first resistor being electrically connected to a second end of the second resistor; the first end of the second resistor is electrically connected with the signal output end of the first power amplifier, and the second end of the second resistor is electrically connected with the direct current detection circuit.
4. The computer loudspeaker protection circuit according to claim 3, wherein the direct current detection circuit comprises a first capacitor, a second capacitor, a third resistor, a first triode and a rectification circuit unit, a first end of the first capacitor is electrically connected with a second end of the second resistor, a second end of the first capacitor is electrically connected with a first end of the second capacitor, and a second end of the second capacitor is grounded; the first end of the rectifying circuit unit is electrically connected with the second end of the second resistor, the second end of the rectifying circuit unit is electrically connected with the first end of the third resistor, and the second end of the third resistor is grounded; the base electrode of the first triode is electrically connected with the third end of the rectifying circuit unit, the emitting electrode of the first triode is electrically connected with the fourth end of the rectifying circuit unit, and the collecting electrode of the first triode is electrically connected with the signal input end of the driving circuit.
5. The computer speaker protection circuit as claimed in claim 4, wherein the driving circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, and a second transistor, a first end of the fourth resistor is electrically connected to a first end of the sixth resistor, and a second end of the fourth resistor is electrically connected to a collector of the first transistor; a first end of the fifth resistor is connected with a second end of the fourth resistor, and a second end of the fifth resistor is electrically connected with a base electrode of the second triode; the second end of the sixth resistor is electrically connected with the collector of the second triode; and the emitter of the second triode is grounded.
6. The computer loudspeaker protection circuit of claim 5, wherein the transistor switch circuit comprises a seventh resistor, a first diode, a first end of the seventh resistor being electrically connected to a second end of the sixth resistor, a second end of the seventh resistor being electrically connected to a third pin of the first diode; the first end of the first diode is electrically connected with the switch protection circuit and the execution circuit, and the second end of the first diode is grounded.
7. The computer speaker protection circuit of claim 6, wherein the switch protection circuit comprises a second diode, a first terminal of the second diode being electrically connected to a first terminal of the sixth resistor, the first terminal of the second diode further being adapted to be electrically connected to a power source, a second terminal of the second diode being electrically connected to the first terminal of the first diode.
8. The computer loudspeaker protection circuit of claim 7, wherein the execution circuit comprises a relay, a first terminal of the relay being adapted to be electrically connected to the power source, a second terminal of the relay being electrically connected to a first terminal of the first diode; the first switch of the relay is electrically connected with the output end of the first power amplifier and the first loudspeaker, and the second switch of the relay is electrically connected with the output end of the second power amplifier and the second loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922245932.3U CN211406263U (en) | 2019-12-16 | 2019-12-16 | Computer loudspeaker protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922245932.3U CN211406263U (en) | 2019-12-16 | 2019-12-16 | Computer loudspeaker protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211406263U true CN211406263U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922245932.3U Active CN211406263U (en) | 2019-12-16 | 2019-12-16 | Computer loudspeaker protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211406263U (en) |
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2019
- 2019-12-16 CN CN201922245932.3U patent/CN211406263U/en active Active
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