CN204168245U - High bass power amplifier zero passage protection lock-in circuit - Google Patents
High bass power amplifier zero passage protection lock-in circuit Download PDFInfo
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- CN204168245U CN204168245U CN201420530740.1U CN201420530740U CN204168245U CN 204168245 U CN204168245 U CN 204168245U CN 201420530740 U CN201420530740 U CN 201420530740U CN 204168245 U CN204168245 U CN 204168245U
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Abstract
A kind of high bass power amplifier zero passage protection lock-in circuit, comprise electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29, the output of high pitch power amplifier and the output of bass amplifier are connected with the base stage of electric capacity C72 and triode Q12 respectively, the emitter of triode Q12 is connected with the base stage of triode Q13, the collector electrode of triode Q12 is connected with the base stage of triode Q14, the emitter of triode Q13 is connected with the base stage of triode Q12, the collector electrode of triode Q13 is connected with the base stage of triode Q14, the emitter of triode Q14 is connected with 12V direct voltage, the collector electrode of triode Q14 is by SCR control power protecting circuit, described power protecting circuit is connected with power supply, described power supply is given high, bass amplifier is powered.Can protect high bass power amplifier in real time with silicon controlled protective circuit.
Description
Technical field
The utility model relates to power amplifier protective circuit, especially high bass power amplifier zero passage protection lock-in circuit.
Background technology
Audio frequency amplifier is widely used in home theater, sound system, stereo record-player, servo amplifier isoelectronic series system.People, while pursuit hi-fi audio power amplifier, also wish that power amplifier has large power output and high efficiency.Powerful audio frequency power amplifier output current is all greater than 1A, and power is larger, and output current is also larger.When there being big current to flow through power output pipe for a long time, when especially there is output short-circuit, power output pipe can be made to burn out.Therefore current foldback circuit must be had, restriction maximum output current, protection efferent duct.Secondly under different voltage condition, the maximum output current ability of efferent duct is also different, if only limiting efferent duct electric current is a specific electric current, then when mains voltage variations, even if there is current-limiting protection circuit, power output pipe also likely burns out.Therefore power amplifier efferent duct not only needs overcurrent protection also to need under different voltage, and the electric current of this protection also will change.Therefore we are power defencive function at the protecting circuit designed of efferent duct, and namely when supply voltage height, protective current reduces; When power electric is forced down, protective current increases, and ensures that power output pipe is not burned with this.Current high bass power amplifier lacks effective circuit protection circuit, causes power amplifier to be easily burned.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of high bass power amplifier zero passage protection lock-in circuit, has protective effect to high pitch power amplifier and bass power amplifier.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of high bass power amplifier zero passage protection lock-in circuit, comprise electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29, the output of high pitch power amplifier and the output of bass amplifier are connected with the base stage of electric capacity C72 and triode Q12 respectively, the emitter of triode Q12 is connected with the base stage of triode Q13, the collector electrode of triode Q12 is connected with the base stage of triode Q14, the emitter of triode Q13 is connected with the base stage of triode Q12, the collector electrode of triode Q13 is connected with the base stage of triode Q14, the emitter of triode Q14 is connected with 12V direct voltage, the collector electrode of triode Q14 is by SCR control power protecting circuit, described power protecting circuit is connected with power supply, described power supply is given high, bass amplifier is powered.Electric capacity C72 can elimination input alternating current; when the direct current being input to triode Q12 base stage is high potential; triode Q12 conducting; the base stage of triode Q14 is pulled to electronegative potential; because the emitter of triode Q14 is connected with high potential; the current collection very high potential of triode Q14, thus control silicon controlled conducting, finally complete the control to power protecting circuit.
The beneficial effect that the utility model is compared with prior art brought is:
Can protect high bass power amplifier in real time with silicon controlled protective circuit.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.
As shown in Figure 1, a kind of high bass power amplifier zero passage protection lock-in circuit, comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29.The output of high pitch power amplifier is connected with the base stage of electric capacity C72 and triode Q12 respectively by resistance R106 with R78 with the output of bass amplifier, electric capacity C72 ground connection, and resistance R79 is connected with triode Q12 base stage with electric capacity C72 one end, and the other end altogether; The emitter of triode Q12 is connected with the base stage of triode Q13, and the collector electrode of triode Q12 is connected with the base stage of triode Q14, and the emitter of triode Q13 is connected with the base stage of triode Q12, the base earth of triode Q13; The collector electrode of triode Q13 is connected with the base stage of triode Q14 by resistance R81, and the emitter of triode Q14 is connected with 12V direct voltage, is connected with resistance R80 parallel with one another and electric capacity C69 between the emitter of triode Q14 and base stage; The collector electrode of triode Q14 controls power protecting circuit by controllable silicon D29, and silicon controlled positive pole is connected with power protecting circuit, is connected with resistance R83 parallel with one another and electric capacity C74 between negative pole and control pole.Described power protecting circuit is connected with power supply, and described power supply powers to high and low sound power amplifier.Electric capacity C72 can elimination input alternating current; when the direct current being input to triode Q12 base stage is high potential; triode Q12 conducting; the base stage of triode Q14 is pulled to electronegative potential; because the emitter of triode Q14 is connected with high potential; the current collection very high potential of triode Q14, thus control silicon controlled conducting, finally complete the control to power protecting circuit.
Claims (1)
1. one kind high bass power amplifier zero passage protection lock-in circuit, it is characterized in that, comprise electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29, the output of high pitch power amplifier and the output of bass amplifier are connected with the base stage of electric capacity C72 and triode Q12 respectively, the emitter of triode Q12 is connected with the base stage of triode Q13, the collector electrode of triode Q12 is connected with the base stage of triode Q14, the emitter of triode Q13 is connected with the base stage of triode Q12, the collector electrode of triode Q13 is connected with the base stage of triode Q14, the emitter of triode Q14 is connected with 12V direct voltage, the collector electrode of triode Q14 is by SCR control power protecting circuit, described power protecting circuit is connected with power supply, described power supply is given high, bass amplifier is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420530740.1U CN204168245U (en) | 2014-09-16 | 2014-09-16 | High bass power amplifier zero passage protection lock-in circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420530740.1U CN204168245U (en) | 2014-09-16 | 2014-09-16 | High bass power amplifier zero passage protection lock-in circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204168245U true CN204168245U (en) | 2015-02-18 |
Family
ID=52541893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420530740.1U Active CN204168245U (en) | 2014-09-16 | 2014-09-16 | High bass power amplifier zero passage protection lock-in circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204168245U (en) |
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2014
- 2014-09-16 CN CN201420530740.1U patent/CN204168245U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |