CN2517176Y - Load testing protection device for audio-frequency video-frequency amplifier - Google Patents
Load testing protection device for audio-frequency video-frequency amplifier Download PDFInfo
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- CN2517176Y CN2517176Y CN 02225352 CN02225352U CN2517176Y CN 2517176 Y CN2517176 Y CN 2517176Y CN 02225352 CN02225352 CN 02225352 CN 02225352 U CN02225352 U CN 02225352U CN 2517176 Y CN2517176 Y CN 2517176Y
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Abstract
The utility model relates to a load detection device of audio-video amplifier. The composition of the device is: the output of the relay 1 is divided into two roads, one road is connected with the load 2, the other road is connected the input terminal A or B of the relay 1, the input terminal A of the relay 1 is connected with the pitch point 3, the pitch point 3 is divided into two roads, one road is connected with the partial pressure resistance 4, the other road is connected with the input terminal of the sampling amplifier 5, the partial pressure resistance 6 and the limiting circuit 7 are separately connected on the wire splice of the pitch point 3 and the sampling amplifier 5, the output of the sampling amplifier 5 is connected with the input terminal of the DC-AC converter 8, the output of the DC-AC converter 8 is connected with the input terminal of the micro-processing controller 9, the output of the micro-processing controller 9 is divided into three roads, the first road is connected with the displays 0, the second road is connected with the control input terminal of the relay 1, the third road is connected with the input terminal of the power amplifier 11, the output of the power amplifier 11 is connected with the pitch point 17, the pitch point 17 is divided into two roads, and separately connected with the partial pressure resistance 4, the input terminal 2 of the relay B.
Description
Technical field:
The utility model relates to a kind of audio or video amplifier load detecting protective device.
Background technology:
By retrieval, do not find similar audio or video amplifier load detecting protective device.
The utility model content:
The purpose of this utility model is to utilize A/D Sampling techniques, sinusoidal wave generation technique, CPU control technology; whether the speaker system of automatically differentiating audio or video amplifier effectively and being connected is normal; can avoid not matching because of loudspeaker impedance; impedance is low excessively, too high, short circuit, and the undesired or pair amplifier of the bad various sound playing that cause of wiring causes the audio or video amplifier Weight detector of damage.
The purpose of this utility model can reach by following measure:
This audio or video amplifier load detecting protective device; comprise: relay 1; resistance 2; 4 and 6; amplifier 5 and 11; AC/DC changeover switch 8; microprocessor 9; display unit 10; its special character is: the output of relay 1 divides two the tunnel; one the tunnel connects load 2; another road connects relay 1 input A; or succeed electrical equipment input B; relay 1 input B connected node 3; node 3 minutes two tunnel; one the tunnel connects divider resistance 4; another road connects sampling amplifier 5 inputs, is connected divider resistance 6 and amplitude limiter circuit 7 respectively, the input of the output connection AC/DC changeover switch 8 of sampling amplifier 5 on the line of node 3 and sampling amplifier 5; the output of AC/DC changeover switch 8 connects the input of microprocessor controller 9; microprocessor controller output in 9 minutes three tunnel, the first via connect the control input end that display 10, the second tunnel connects relay 1; Third Road connects the input of power amplifier 11, and the output of power amplifier 11 connects divider resistance 4 respectively; the input A of relay 1.
The purpose of this utility model can also reach by following measure:
Connect successively on the Third Road of microprocessor controller 9 outputs and the line of power amplifier 11 inputs low pass filter 3, volume controller 14.
Microprocessor controller 9 is made up of the A/D converter 14 of its input series connection and processor 15 and the input sine-wave generator 16 that is connected power amplifier 11, or connects low pass filter 12, volume controller 13, power amplifier 11 successively.
11 in forcing function generator 16 outputs and the power amplifier of microprocessor controller 9 connect successively low pass filter 12 and volume controller 13.
The utility model has following advantage compared to existing technology:
1. automaticity height;
2. accuracy of detection height, good reliability;
3. according to actual needs, microprocessor controller can have the formation of different integrated packages.
4. can avoid exceeding the scope that machine can bear and influencing normal use or machine is caused damage because of load connects improper, load.
Description of drawings:
Fig. 1 is a theory diagram of the present utility model.
Embodiment:
The present invention is further detailed in conjunction with the accompanying drawings below:
The output of the relay 1 of this audio or video amplifier load detecting protective device divides two the tunnel; one the tunnel connects load 2; another road connects relay input A; relay input B connected node 3; node 3 minutes two tunnel; one the tunnel connects divider resistance 4; another road connects sampling amplifier 5 inputs; on the line of node 3 and sampling amplifier 5, be connected divider resistance 6 and amplitude limiter circuit 7 respectively; the output of sampling amplifier 5 connects the input of AC/DC changeover switch 8; the output of AC/DC changeover switch 8 connects the input of microprocessor controller 9; microprocessor controller output in 9 minutes three tunnel; the first via connects the control input end that display 10, the second tunnel connects relay 1, the low pass filter 12 of connecting successively on the line of Third Road and power amplifier 11 inputs; volume controller 13.The output connected node 17 of power amplifier 11 connects 17 fens two-way of node, connects the input A of divider resistance 4 and relay 1 respectively.Microprocessor controller 9 is made up of the A/D converter 14 of its input series connection and processor 15 and the sine-wave generator 16 that is connected merit amplifier 11 inputs.
Workflow is as follows:
Sine-wave generator 16 produces sine wave signal as testing source, testing source is delivered to volume controller 13 and is regulated control through volume controller 13 and makes it that suitable amplitude output be arranged after useless high frequency clutter of low pass filter 12 filterings and waveform modification, volume controller 13 output signals are carried out signal through amplifier 11 and are amplified and power amplification, two-way output is divided in the back, one the tunnel directly to the 1 selection output of relay 1 input A confession relay, one the tunnel is connected to another input B of relay 1 as test signal through divider resistance 4, select output for relay 1, the output termination load impedance 2 (or loud speaker) of relay 1, relay output selects control end to be subjected to microprocessor controller 9 controls, when selecting the output of relay A end, be normal output: when selecting the output of relay B end, then be test signal output, at this moment the sampled signal of node 3 is effective, sampled signal is delivered to amplifier 5 through amplitude limiter 7 and is amplified, after AC/DC changeover switch 8 output direct current signals send in the input port of the A/D converter 14 of microprocessor controller 9, A/D converter 14 is converted to digital signal with the direct current signal of sending here, processing through microprocessor controller 9 processors 15, simultaneously declare the present load situation, and show the present load situation by display unit according to result.
Claims (4)
1. audio or video amplifier Weight detector, comprise: relay 1, resistance 2,4 and 6, amplifier 5 and 11, AC/DC changeover switch 8, microprocessor 9, display unit 10, it is characterized in that: the output of relay 1 divides two the tunnel, one the tunnel connects load 2, another road connects relay 1 input A, or succeed electrical equipment input B, relay 1 input B connected node 3, node 3 minutes two tunnel, one the tunnel connects divider resistance 4, another road connects sampling amplifier 5 inputs, is connected divider resistance 6 and amplitude limiter circuit 7 respectively, the input of the output connection AC/DC changeover switch 8 of sampling amplifier 5 on the line of node 3 and sampling amplifier 5, the output of AC/DC changeover switch 8 connects the input of microprocessor controller 9, microprocessor controller output in 9 minutes three tunnel, the first via connect the control input end that display 10, the second tunnel connects relay 1, Third Road connects the input of power amplifier 11, and the output of power amplifier 11 connects the input A of divider resistance 4 and relay 1 respectively.
2. audio or video amplifier Weight detector according to claim 1 is characterized in that: connect successively on the Third Road of microprocessor controller 9 outputs and the line of power amplifier 11 inputs low pass filter 3, volume controller 14.
3. audio or video amplifier Weight detector according to claim 1 is characterized in that: microprocessor controller 9 is made up of the A/D converter 14 of its input series connection and CPU processor 15 and the sine-wave generator 16 that is connected power amplifier 11 inputs.
4. audio or video amplifier Weight detector according to claim 1 is characterized in that: 11 in sine-wave generator 16 outputs and the power amplifier of microprocessor controller 9 connect successively low pass filter 12 and volume controller 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02225352 CN2517176Y (en) | 2002-01-23 | 2002-01-23 | Load testing protection device for audio-frequency video-frequency amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02225352 CN2517176Y (en) | 2002-01-23 | 2002-01-23 | Load testing protection device for audio-frequency video-frequency amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2517176Y true CN2517176Y (en) | 2002-10-16 |
Family
ID=33702576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02225352 Expired - Fee Related CN2517176Y (en) | 2002-01-23 | 2002-01-23 | Load testing protection device for audio-frequency video-frequency amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2517176Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407538C (en) * | 2005-03-11 | 2008-07-30 | 广东中钰科技有限公司 | Lightning protection device for video frequency monitoring equipment |
| CN106093573A (en) * | 2016-05-30 | 2016-11-09 | 中国西电电气股份有限公司 | Super, extra-high voltage direct-current transmission TCU converter valve components IGCT level impedance test system |
-
2002
- 2002-01-23 CN CN 02225352 patent/CN2517176Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407538C (en) * | 2005-03-11 | 2008-07-30 | 广东中钰科技有限公司 | Lightning protection device for video frequency monitoring equipment |
| CN106093573A (en) * | 2016-05-30 | 2016-11-09 | 中国西电电气股份有限公司 | Super, extra-high voltage direct-current transmission TCU converter valve components IGCT level impedance test system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |