CN204167864U - Power amplifier mainboard circuit - Google Patents
Power amplifier mainboard circuit Download PDFInfo
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- CN204167864U CN204167864U CN201420531046.1U CN201420531046U CN204167864U CN 204167864 U CN204167864 U CN 204167864U CN 201420531046 U CN201420531046 U CN 201420531046U CN 204167864 U CN204167864 U CN 204167864U
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Abstract
A kind of power amplifier mainboard circuit, comprises voltage amplifier circuit, current drives circuit, presses and ration the power supply road, power amplifier, current foldback circuit, DC protection circuit, thermal-shutdown circuit and fall power circuit; Described voltage amplifier circuit drives loudspeaker by current drives circuit, power amplifier successively; described pressure road of rationing the power supply is connected with current drives circuit, described current foldback circuit, DC protection circuit, thermal-shutdown circuit with fall power circuit and be connected with power amplifier respectively.The utility model have employed the multinomial circuit with defencive function and rations the power supply road, current foldback circuit, DC protection circuit, thermal-shutdown circuit as pressed and fall power circuit, effectively protects, prevent power amplifier mainboard generation burning machine phenomenon to power amplifier mainboard.
Description
Technical field
The utility model relates to power amplifier, especially a kind of power amplifier mainboard 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 power board lacks effective protective circuit.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of power amplifier mainboard circuit, can available protecting mainboard, prevents power amplifier mainboard generation burning machine phenomenon.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of power amplifier mainboard circuit, comprises voltage amplifier circuit, current drives circuit, presses and ration the power supply road, power amplifier, current foldback circuit, DC protection circuit, thermal-shutdown circuit and fall power circuit; Described voltage amplifier circuit drives loudspeaker by current drives circuit, power amplifier successively; described pressure road of rationing the power supply is connected with current drives circuit, described current foldback circuit, DC protection circuit, thermal-shutdown circuit with fall power circuit and be connected with power amplifier respectively.The utility model have employed the multinomial circuit with defencive function and rations the power supply road, current foldback circuit, DC protection circuit, thermal-shutdown circuit as pressed and fall power circuit, effectively protects, prevent power amplifier mainboard generation burning machine phenomenon to power amplifier mainboard.
As improvement, described DC protection circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon, the input of DC protection circuit is 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 supply.
As improvement, the feedback signal line of voltage amplifier circuit is connected with tablet, and described tablet and pressure road of rationing the power supply is connected.
The beneficial effect that the utility model is compared with prior art brought is:
The utility model have employed the multinomial circuit with defencive function and rations the power supply road, current foldback circuit, DC protection circuit, thermal-shutdown circuit as pressed and fall power circuit, effectively protects, prevent power amplifier mainboard generation burning machine phenomenon to power amplifier mainboard.
Accompanying drawing explanation
Fig. 1 is the utility model electrical diagram.
Fig. 2 is DC protection circuit 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 power amplifier mainboard circuit, comprises voltage amplifier circuit, current drives circuit, presses and ration the power supply road, power amplifier, current foldback circuit, DC protection circuit, thermal-shutdown circuit and fall power circuit; Described voltage amplifier circuit drives loudspeaker by current drives circuit, power amplifier successively; described pressure road of rationing the power supply is connected with current drives circuit, described current foldback circuit, DC protection circuit, thermal-shutdown circuit with fall power circuit and be connected with power amplifier respectively.The feedback signal line of voltage amplifier circuit is connected with tablet, and described tablet and pressure road of rationing the power supply is connected.
As shown in Figure 2, described DC protection circuit comprises described direct current protecting testing circuit and comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon D29, the input of DC protection circuit is 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 controls power protecting circuit by controllable silicon D29.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 supply.
The utility model have employed the multinomial circuit with defencive function and rations the power supply road, current foldback circuit, DC protection circuit, thermal-shutdown circuit as pressed and fall power circuit, effectively protects, prevent power amplifier mainboard generation burning machine phenomenon to power amplifier mainboard.
Claims (3)
1. a power amplifier mainboard circuit, is characterized in that: comprise voltage amplifier circuit, current drives circuit, press and ration the power supply road, power amplifier, current foldback circuit, DC protection circuit, thermal-shutdown circuit and fall power circuit; Described voltage amplifier circuit drives loudspeaker by current drives circuit, power amplifier successively; described pressure road of rationing the power supply is connected with current drives circuit, described current foldback circuit, DC protection circuit, thermal-shutdown circuit with fall power circuit and be connected with power amplifier respectively.
2. power amplifier mainboard circuit according to claim 1, it is characterized in that: described DC protection circuit comprises electric capacity C72, triode Q12, triode Q13, triode Q14 and controllable silicon, the input of DC protection circuit is 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 supply.
3. power amplifier mainboard circuit according to claim 1, is characterized in that: the feedback signal line of voltage amplifier circuit is connected with tablet, and described tablet and pressure road of rationing the power supply is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420531046.1U CN204167864U (en) | 2014-09-16 | 2014-09-16 | Power amplifier mainboard circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420531046.1U CN204167864U (en) | 2014-09-16 | 2014-09-16 | Power amplifier mainboard circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204167864U true CN204167864U (en) | 2015-02-18 |
Family
ID=52541515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420531046.1U Active CN204167864U (en) | 2014-09-16 | 2014-09-16 | Power amplifier mainboard circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204167864U (en) |
-
2014
- 2014-09-16 CN CN201420531046.1U patent/CN204167864U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |