CN202918247U - Digital short-circuit protection device of audio power amplifier - Google Patents
Digital short-circuit protection device of audio power amplifier Download PDFInfo
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- CN202918247U CN202918247U CN 201220564198 CN201220564198U CN202918247U CN 202918247 U CN202918247 U CN 202918247U CN 201220564198 CN201220564198 CN 201220564198 CN 201220564198 U CN201220564198 U CN 201220564198U CN 202918247 U CN202918247 U CN 202918247U
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Abstract
The utility model discloses a digital short-circuit protection device of an audio power amplifier. The digital short-circuit protection device of the audio power amplifier comprises a power amplifier output circuit module and further comprises a relay circuit module, an amplifying buffer circuit module, a computer module with an analog-to-digital (A/D) single chip and a relay controlling circuit module, wherein the relay circuit module is used for controlling power amplifier output, the amplifying buffer circuit module is used for amplifying and buffering power, the computer module with the A/D single chip is used for identifying current values and outputting control signals, and the relay controlling circuit module is used for controlling the starting control of the relay. The digital short-circuit protection device of the audio power amplifier is convenient to sample, free of the limit of circuit topologies, an optimum value can be preset for a short-circuit starting-control current, and a time value can be preset according to requirements for short-circuit time.
Description
Technical field
The utility model relates to a kind of short-circuit protection, is specifically related to the digital short-circuit protection of a kind of audio power amplifier.
Background technology
As audio power amplifier, because environment for use varies, easily cause when mounted short circuit.Particularly flow and use, often the easier output short-circuit that makes is used in dismounting.Even correct the installation is because the audio amplifier fault also can form short circuit.In such cases, it is important that short-circuit protection just seems.
The tradition short-circuit protection; because sampling current is not complete audio power amplifier output current; directly drive triode and form protection behind the RC circuit, the protective current value can only obtain by experiment, and experiment burns to determine that with power tube surplus finally forms protection usually.Time also regularly drives triode with RC and determines.During use, it is relevant with the multiplication factor of triode that circuit function has determined to start to control protective current, and the time flows in the time difference of starting to control the influence degree to RC and determines to cross.Because triode multiplication factor discreteness is very large, to cross and flow to the time difference of starting to control and contradict with the time of starting to control, every batch of change parameter usually during actual the use is used also not bery ideal.
The utility model content
The utility model has overcome the deficiencies in the prior art, and a kind of simple, reliable digital short-circuit protection of audio power amplifier is provided.
For solving above-mentioned technical problem, the utility model by the following technical solutions:
The digital short-circuit protection of a kind of audio power amplifier comprises power amplifier output circuit module; The digital short-circuit protection of described audio power amplifier also comprises: be used for the output of control power amplifier the relay circuit module, be used for the power amplification buffering amplification buffer circuit module, be used for the identification current value, the band A/D(digital to analog converter of output control signal) the monolithic computer module, be used for the control relay circuit module that control relay starts to control; The output of described power amplifier output circuit module is electrically connected with the relay circuit module, the relay circuit module is connected with amplification buffer circuit module input, amplifying buffer circuit module output is electrically connected with input with A/D monolithic computer module, output with A/D monolithic computer module is electrically connected with the control relay circuit module input, and the output of control relay circuit module is electrically connected with the relay circuit module.
Further technical scheme is that described relay circuit module comprises: relay J D1; Described relay J D1 normally opened contact switch one end and power amplifier output link, and the other end and load link.
Further technical scheme is that the output series connection of described power amplifier output circuit module is for the sampler of the current value that obtains power amplifier output, described sampler comprises sample resistance R1, and sample resistance R1 is electrically connected with amplification buffer circuit module input.
Further technical scheme is that described amplification buffer circuit module comprises: resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1, capacitor C 2, diode D1, diode D2, integrated operational amplifier IC3; Described capacitor C 1 anode accesses sample resistance R 1, negative terminal and resistance R 2, R3 link, resistance R 2 another terminations are with reference to ground, resistance R 3 other ends and IC3 operational amplifier end of oppisite phase 2 pin, capacitor C 2, resistance R 4 link, IC3 operational amplifier positive terminal 3 pin connect with reference to ground, resistance R 4, capacitor C 2 other ends link and link with IC3 operational amplifier output terminal 1 pin, resistance R 5, resistance R 6, and resistance R 5 another terminations are with reference to ground.Resistance R 6 another terminating diode D1 anodes, diode D1 negative terminal and resistance R 7, voltage-stabiliser tube D2 negative terminal link.
Further technical scheme is that described band A/D monolithic computer module comprises: write the band A/D monolithic computer IC2 of control program, described band A/D monolithic computer comprises: P1.0 port, output port P1.1 port with A/D function; Described P1.0 port and diode D1 negative terminal, resistance R 7, voltage-stabiliser tube D2 negative terminal with A/D monolithic computer IC2 links, and P1.1 port and resistance R 8 link.
Further technical scheme is that described control relay circuit module comprises: resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, capacitor C 3, triode Q2, triode Q3, triode Q1, diode D3, diode D4, diode D5; Described resistance R 8 links with single-chip microcomputer P1.1 port, triode Q3 emitter links with+5V voltage, triode Q3 base stage and resistance R 8 other ends link, collector electrode and resistance R 9 and resistance R 10 link, link to resistance R 9 other ends and reference, resistance R 10 links with triode Q2 base stage and R11, resistance R 11 other ends and triode Q2 collector electrode, diode D3 anode, resistance R 12, voltage stabilizing didoe D4 negative terminal, capacitor C 3 anodes link, link to triode Q2 emitter and reference, resistance R 12 other ends and diode D3 anode, the relay supply power voltage links, link to capacitor C 3 negative terminals and reference, voltage stabilizing didoe D4 anode and triode Q1 base stage link, triode Q1 collector electrode and relay J D1 line bag diode D5 anode link diode D5 negative terminal and the relay J D1 line bag other end, the relay power supply links.
Compared with prior art, the beneficial effects of the utility model are: sampling is convenient, and not limit by circuit topology; Electric current is started to control in short circuit can accurately preset optimum value; Duration of short circuit is the setting-up time value as required.
Description of drawings
Fig. 1 is the schematic block diagram of an embodiment of the utility model.
Fig. 2 is the circuit theory diagrams of an embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further elaborated.
As shown in Figure 1, Fig. 1 shows the schematic block diagram of an embodiment of the utility model.The digital short-circuit protection of present embodiment audio power amplifier comprises power amplifier output circuit module; Also comprise: be used for the output of control power amplifier the relay circuit module, be used for the power amplification buffering amplification buffer circuit module, be used for the identification current value, the output control signal with A/D monolithic computer module, be used for the control relay circuit module that control relay starts to control; The output of described power amplifier output circuit module is electrically connected with the relay circuit module, the relay circuit module is connected with amplification buffer circuit module input, amplifying buffer circuit module output is electrically connected with input with A/D monolithic computer module, output with A/D monolithic computer module is electrically connected with the control relay circuit module input, and the output of control relay circuit module is electrically connected with the relay circuit module.
As shown in Figure 2, Fig. 2 shows the circuit theory diagrams of an embodiment of the utility model.As shown in Figure 2, the output of present embodiment intermediate power amplifier A is connected with relay J D1 normally opened contact one end, the accurate current value that relay J D1 normally opened contact other end series connection accurate sampler, accurate sampler obtain power amplifier output amplifies buffering by amplifying buffer circuit.Accurate sampler comprises return loss RL, sample resistance R1, and sample resistance R1 one end is electrically connected simultaneously access and amplifies buffer circuit with return loss RL, and another termination is with reference to ground.The sample circuit sampling is convenient, and not limit by circuit topology.Amplifying buffer circuit comprises: resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1, capacitor C 2, diode D1, diode D2, integrated operational amplifier IC3; Capacitor C 1 anode accesses sample resistance R 1, negative terminal and resistance R 2, R3 link, resistance R 2 another terminations are with reference to ground, resistance R 3 other ends and IC3 operational amplifier end of oppisite phase 2 pin, capacitor C 2, resistance R 4 link, IC3 operational amplifier positive terminal 3 pin connect with reference to ground, resistance R 4, capacitor C 2 other ends link and link with IC3 operational amplifier output terminal 1 pin, resistance R 5, resistance R 6, and resistance R 5 another terminations are with reference to ground.Resistance R 6 another terminating diode D1 anodes, diode D1 negative terminal and resistance R 7, voltage-stabiliser tube D2 negative terminal link.After the amplification buffer circuit amplifies buffering with the signal of telecommunication, by the monolithic computer identification with A/D, started to control according to the required accurate control relay of electric current that starts to control by pre-set programs behind the software correction through writing, the control time, mode etc. is precisely set with software.Pre-set programs described in this enforcement is prior art, and pre-set programs is revisable program when using in the present embodiment, specifically, can revise according to actual needs required control program.Band A/D monolithic computer comprises: write the band A/D monolithic computer IC2 of control program, band A/D monolithic computer comprises: P1.0 port, output port P1.1 port with A/D function; Band is that P1.0 port and diode D1 negative terminal, resistance R 7, voltage-stabiliser tube D2 negative terminal with A/D monolithic computer IC2 links with the circuit connecting relation of A/D monolithic computer IC2, and P1.1 port and resistance R 8 link.Band A/D monolithic computer IC2 exports to control relay circuit with control signal, the work of control relay circuit control relay.According to the control program that writes in the A/D monolithic computer IC2, electric current is started to control in short circuit can accurately preset optimum value; Duration of short circuit is the setting-up time value as required.Control relay circuit comprises: resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, capacitor C 3, triode Q2, triode Q3, triode Q1, diode D3, diode D4, diode D5; The components and parts annexation of control relay circuit is that resistance R 8 links with single-chip microcomputer P1.1 port, triode Q3 emitter links with+5V voltage, wherein+5 voltage is preferred voltage, and the voltage source in voltage is other zone of reasonableness is all in protection range of the present utility model; Triode Q3 base stage and resistance R 8 other ends link, collector electrode and resistance R 9 and resistance R 10 link, link to resistance R 9 other ends and reference, resistance R 10 links with triode Q2 base stage and R11, resistance R 11 other ends and triode Q2 collector electrode, diode D3 anode, resistance R 12, voltage stabilizing didoe D4 negative terminal, capacitor C 3 anodes link, link to triode Q2 emitter and reference, resistance R 12 other ends and diode D3 anode, the relay supply power voltage links, link to capacitor C 3 negative terminals and reference, voltage stabilizing didoe D4 anode and triode Q1 base stage link, triode Q1 collector electrode and relay J D1 line bag diode D5 anode link diode D5 negative terminal and the relay J D1 line bag other end, the relay power supply links.After the control signal of control relay circuit receiving belt A/D monolithic computer circuit, carry out control work, the work of control relay JD1, thus play the short-circuit protection effect.The digital short-circuit protection of present embodiment audio power amplifier is not subjected to the impact of power amplifier circuit type.
" embodiment " who speaks of in this manual, " another embodiment ", " embodiment ", etc., refer to specific features, structure or the characteristics described in conjunction with this embodiment and be included among at least one embodiment that the application's generality describes.A plurality of local appearance statement of the same race is not necessarily to refer to same embodiment in specification.Furthermore, when describing a specific features, structure or characteristics in conjunction with any embodiment, what advocate is to realize that in conjunction with other embodiment this feature, structure or characteristics also drop in the scope of the present utility model.
Although a plurality of explanatory embodiment with reference to utility model is described the utility model here, but, should be appreciated that, those skilled in the art can design a lot of other modification and execution modes, and these are revised and execution mode will drop within the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to building block and/or the layout of subject combination layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes also will be obvious.
Claims (6)
1. the digital short-circuit protection of audio power amplifier comprises power amplifier output circuit module; It is characterized in that: the digital short-circuit protection of described audio power amplifier also comprises: be used for the output of control power amplifier the relay circuit module, be used for the power amplification buffering amplification buffer circuit module, be used for the identification current value, the output control signal with A/D monolithic computer module, be used for the control relay circuit module that control relay starts to control; The output of described power amplifier output circuit module is electrically connected with the relay circuit module, the relay circuit module is connected with amplification buffer circuit module input, amplifying buffer circuit module output is electrically connected with input with A/D monolithic computer module, output with A/D monolithic computer module is electrically connected with the control relay circuit module input, and the output of control relay circuit module is electrically connected with the relay circuit module.
2. the digital short-circuit protection of audio power amplifier according to claim 1 is characterized in that described relay circuit module comprises: relay J D1; Described relay J D1 normally opened contact switch one end and power amplifier output link, and the other end and load link.
3. the digital short-circuit protection of audio power amplifier according to claim 1; it is characterized in that the output series connection of described power amplifier output circuit module is used for the sampler of the current value of acquisition power amplifier output; described sampler comprises sample resistance R1, and sample resistance R1 is electrically connected with amplification buffer circuit module input.
4. the digital short-circuit protection of audio power amplifier according to claim 1, it is characterized in that described amplification buffer circuit module comprises: resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1, capacitor C 2, diode D1, diode D2, integrated operational amplifier IC3; Described capacitor C 1 anode accesses sample resistance R 1, negative terminal and resistance R 2, resistance R 3 link, resistance R 2 another terminations are with reference to ground, resistance R 3 other ends and integrated operational amplifier IC3 operational amplifier end of oppisite phase 2 pin, capacitor C 2, resistance R 4 link, integrated operational amplifier IC3 operational amplifier positive terminal 3 pin connect with reference to ground, resistance R 4, capacitor C 2 other ends link and link with integrated operational amplifier IC3 operational amplifier output terminal 1 pin, resistance R 5, resistance R 6, and resistance R 5 another terminations are with reference to ground; Resistance R 6 another terminating diode D1 anodes, diode D1 negative terminal and resistance R 7, voltage-stabiliser tube D2 negative terminal link.
5. the digital short-circuit protection of audio power amplifier according to claim 1, it is characterized in that described band A/D monolithic computer module comprises: write the band A/D monolithic computer IC2 of control program, described band A/D monolithic computer comprises: P1.0 port, output port P1.1 port with A/D function; Described P1.0 port and diode D1 negative terminal, resistance R 7, voltage-stabiliser tube D2 negative terminal with A/D monolithic computer IC2 links, and P1.1 port and resistance R 8 link.
6. the digital short-circuit protection of audio power amplifier according to claim 1, it is characterized in that described control relay circuit module comprises: resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12, capacitor C 3, triode Q2, triode Q3, triode Q1, diode D3, diode D4, diode D5; Described resistance R 8 links with single-chip microcomputer P1.1 port, triode Q3 emitter links with+5V voltage, triode Q3 base stage and resistance R 8 other ends link, collector electrode and resistance R 9 and resistance R 10 link, link to resistance R 9 other ends and reference, resistance R 10 links with triode Q2 base stage and R11, resistance R 11 other ends and triode Q2 collector electrode, diode D3 anode, resistance R 12, voltage stabilizing didoe D4 negative terminal, capacitor C 3 anodes link, link to triode Q2 emitter and reference, resistance R 12 other ends and diode D3 anode, the relay supply power voltage links, link to capacitor C 3 negative terminals and reference, voltage stabilizing didoe D4 anode and triode Q1 base stage link, triode Q1 collector electrode and relay J D1 line bag diode D5 anode link diode D5 negative terminal and the relay J D1 line bag other end, the relay power supply links.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220564198 CN202918247U (en) | 2012-10-31 | 2012-10-31 | Digital short-circuit protection device of audio power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220564198 CN202918247U (en) | 2012-10-31 | 2012-10-31 | Digital short-circuit protection device of audio power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202918247U true CN202918247U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220564198 Expired - Lifetime CN202918247U (en) | 2012-10-31 | 2012-10-31 | Digital short-circuit protection device of audio power amplifier |
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| Country | Link |
|---|---|
| CN (1) | CN202918247U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413548A (en) * | 2018-12-04 | 2019-03-01 | 叶年福 | Prime power amplification circuit |
-
2012
- 2012-10-31 CN CN 201220564198 patent/CN202918247U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413548A (en) * | 2018-12-04 | 2019-03-01 | 叶年福 | Prime power amplification circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 621000 Mianyang city of Sichuan province Youxian Economic Experimental Zone in the road No. 36 Patentee after: SICHUAN HUSHAN ELECTRICAL APPLIANCE CO.,LTD. Address before: 621000 Mianyang city of Sichuan province Youxian Economic Experimental Zone in the road No. 36 Patentee before: SICHUAN HUSHAN ELECTRIC APPLIANCE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |
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| CX01 | Expiry of patent term |