CN207369299U - A kind of Phantom Power circuit with diagnostic function - Google Patents
A kind of Phantom Power circuit with diagnostic function Download PDFInfo
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- CN207369299U CN207369299U CN201720725615.XU CN201720725615U CN207369299U CN 207369299 U CN207369299 U CN 207369299U CN 201720725615 U CN201720725615 U CN 201720725615U CN 207369299 U CN207369299 U CN 207369299U
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- sampling
- power circuit
- diagnostic function
- operational amplifier
- resistance
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Abstract
It the utility model is related to microphone techniques field, specifically disclose a kind of Phantom Power circuit with diagnostic function, equivalent sampling resistance is in series between the voltage output end and microphone of power supply source, the noninverting input of operational amplifier connects the both ends of the equivalent sampling resistance, the output terminal connection MCU of the operational amplifier with reverse input end.A kind of Phantom Power circuit with diagnostic function provided by the utility model, use high precision operating amplifier, the resistance of smaller resistance value such as 0.1 Ω is amplified and the operating current of MIC is further obtained by the accurate sampling and computing of MCU, and the electric current is contrasted and is diagnosed to be the working status of MIC, its sampling precision can reach 35uV, in the case of using the sampling resistor of 0.1 Ω, it can tell the error outside 350uA, the sampled voltage amplified by high precision operating amplifier after 1000 times can also meet ADC precision (0 3.3V) requirement of MCU, generally sampling precision is high, temperature coefficient is good, power-efficient is high.
Description
Technical field
It the utility model is related to microphone techniques field, more particularly to a kind of Phantom Power circuit with diagnostic function.
Background technology
With the popularization of the vehicle-mounted interacted system such as Car play, vehicle entertainment system wants vehicle body active noise reduction (ANC)
Ask higher and higher, cause the usage quantity of vehicle body MIC (microphone) to greatly increase, in complicated vehicle entertainment system and automobile
In cage structure, the requirement to the reliability and its installation accuracy of MIC is also higher and higher.How the reliability of MIC installation, essence are ensured
True diagnosis is necessary.Realize that supplying power for outside is realized again on Phantom Power circuit to diagnose external circuit, become
The challenge of vehicle entertainment system.
Current vehicle-mounted MIC is to use low power dissipation design, only several milliamperes of its running current consumption.General MCU's
The precision of ADC module is 10bit (i.e. 1/ (2^10)), its voltage range is 0-3.3V, its minimum sampling precision is 3.3mV.Such as
Fruit, which needs to carry out accurately sampling, needs to concatenate several ohm of resistance between power supply source and ADC module, and on the one hand this will significantly
The efficiency of power supply is influenced, the sampling precision of another aspect ADC module is low, temperature coefficient difference.
The content of the invention
The utility model provides a kind of Phantom Power circuit with diagnostic function, solves and is amplified using high-accuracy arithmetic
Device, is amplified the resistance of smaller resistance value such as 0.1 Ω and further obtains the work of MIC by the accurate sampling and computing of MCU
Make electric current, and the electric current is contrasted and is diagnosed to be the technical problem of the working status of MIC.
To solve above technical problem, the utility model provides a kind of Phantom Power circuit with diagnostic function, is powering
Equivalent sampling resistance, the reversely noninverting input of operational amplifier and input are in series between the voltage output end and microphone in source
End connects the both ends of the equivalent sampling resistance, the output terminal connection MCU of the operational amplifier.
Specifically, the equivalent sampling resistance includes the first sampling resistor, the second sampling resistor and the 3rd sampling resistor.
Further, one end and described second of voltage output end connection first sampling resistor of the power supply source is adopted
One end of sample resistance, the other end of first sampling resistor connect one end of the microphone and the 3rd sampling resistor,
The other end of the other end of second sampling resistor and the 3rd sampling resistor connects the same of the operational amplifier respectively
To input terminal and reverse input end.
Further, one end of reverse input end the first feedback resistance of connection of the operational amplifier, described first
The other end of feedback resistance connects the output terminal of the operational amplifier.
Further, the ADC module of the MCU connects the output terminal of the operational amplifier or first feedback resistance
The other end.
Further, it is connected with second between the ground terminal of the noninverting input of the operational amplifier and the power supply source
Feedback resistance.
Preferably, the operational amplifier selects INA214BID.
Specifically, the voltage sample scope of the ADC module is 0-3.3V.
A kind of Phantom Power circuit with diagnostic function provided by the utility model, it is right using high precision operating amplifier
The resistance of smaller resistance value such as 0.1 Ω is amplified and further obtains the work electricity of MIC by the accurate sampling and computing of MCU
Stream, and the electric current is contrasted and is diagnosed to be the working status of MIC, its sampling precision can reach 35uV, use 0.1 Ω
Sampling resistor in the case of, it can tell the error outside 350uA, by high precision operating amplifier amplify 1000 times after
Sampled voltage can also meet ADC precision (0-3.3V) requirement of MCU, and generally sampling precision is high, temperature coefficient is good, power supply effect
Rate is high, can preferably meet the diagnosis requirement of depot.
Brief description of the drawings
Fig. 1 is that a kind of circuit theory for Phantom Power circuit with diagnostic function that the utility model embodiment provides is general
Figure；
Fig. 2 is a kind of physical circuit figure for Phantom Power circuit with diagnostic function that the utility model embodiment provides.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe.The type selecting and value size of following component are only preferred embodiment, do not form and the utility model is protected
Protect the limitation of scope.
It is that a kind of circuit for Phantom Power circuit with diagnostic function that the utility model embodiment provides is former referring to Fig. 1
Manage sketch plan.In the present embodiment, a kind of Phantom Power circuit with diagnostic function, it is defeated in the voltage of power supply source POWER
Be in series between outlet and microphone MIR equivalent sampling resistance R, operational amplifier OP noninverting input OP_PIN1 and reversely
The both ends of the input terminal OP_PIN2 connections equivalent sampling resistance R, the output terminal OP_PIN3 connections of the operational amplifier OP
MCU。
It is to be built on the basis of Fig. 1 referring to Fig. 2.Wherein, the equivalent sampling resistance R in Fig. 1 is
First sampling resistor RAD, the second sampling resistor RIN+With the 3rd sampling resistor RIN-Formed by the way that series-parallel connection mode is equivalent,
Its specific connection relation is：The voltage output end of the power supply source POWER connects the first sampling resistor RADOne end and
The second sampling resistor RIN+One end, the first sampling resistor RADThe other end connect the microphone MIR and described the
Three sampling resistor RIN-One end, the second sampling resistor RIN+The other end and the 3rd sampling resistor RIN-The other end
The noninverting input OP_PIN1 and reverse input end OP_PIN2 of the operational amplifier OP is connected respectively.
Also, one end of reverse input end OP_PIN2 the first feedback resistances of connection RF1 of the operational amplifier OP, institute
State the first feedback resistance RF1The other end connect the output terminal OP_PIN3 of the operational amplifier OP.The ADC module of the MCU
Connect first feedback resistances of the output terminal OP_PIN3 or described R of the operational amplifier OPF1The other end.The operation amplifier
The second feedback resistance R is connected between the ground terminal of the noninverting input OP_PIN1 of device OP and the power supply source POWERF2.Cause
Power supply for MCU is 3.3V, therefore the voltage sample scope of the ADC module is 0-3.3V.
In Fig. 2, the operational amplifier OP selects INA214BID, the first sampling resistor RADResistance value be 0.1 Ω,
The second sampling resistor RIN+With the 3rd sampling resistor RIN-Resistance value be 1K Ω, i.e. RAD=0.1 Ω, RIN+=RIN-=
1K Ω=RIN, the first feedback resistance RF1With the second feedback resistance RF2Resistance value be the first sampling resistor RAD
Or the second sampling resistor RIN+1000 times of resistance value, i.e. RF1=RF2=RIN* 1000=RF, according to VADC=RAD*IMIC*
(RF/RIN), in conjunction with the state criterion in following table, the diagnosis process to the utility model carries out as described below：
| MIR states judge | MIR current drains | |
| 1 | OPEN | IMIC≤5mA |
| 2 | NORMAL | 7mA<IMIC<10mA |
| 3 | SHORT | IMIC＞ 12mA |
If the microphone MIR is OPEN states, IMIC≤ 5mA, VADC=RAD*IMIC*1000≤ 500mV；
If the microphone MIR is NORMAL states, 7mA<IMIC<10mA, VADC=RAD*IMIC* 1000, i.e. 700mV<
VADC<1000mV；
If the microphone MIR is SHORT states, IMIC>12mA, VADC=RAD*IMIC*1000>1200mV。
That is, when the ADC module, which samples voltage, to be 500mV and is following, MCU is diagnosed to be at microphone MIR at this time
In open-circuit condition；When the ADC module samples voltage between 700mV to 1000mV, MCU is diagnosed to be Mike at this time
Wind MIR is in normal operating conditions；When it is 1200mV and the above that the ADC module, which samples voltage, MCU is diagnosed to be at this time
Microphone MIR is in short-circuit condition.
A kind of Phantom Power circuit with diagnostic function provided by the utility model, using high precision operating amplifier OP,
To the resistance R of smaller resistance value such as 0.1 ΩADIt is amplified and the work of MIC is further obtained by the accurate sampling and computing of MCU
Electric current, and the electric current is contrasted and is diagnosed to be the working status of MIC, its sampling precision can reach 35uV, use 0.1
In the case of the sampling resistor of Ω, it can tell the error outside 350uA, amplify 1000 by high precision operating amplifier OP
Sampled voltage after times can also meet ADC precision (0-3.3V) requirement of MCU.
The above is the preferred embodiment of the utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the scope of protection of the utility model.
Claims (8)
- A kind of 1. Phantom Power circuit with diagnostic function, it is characterised in that power supply source voltage output end and microphone it Between be in series with equivalent sampling resistance, the noninverting input of operational amplifier connects the equivalent sampling resistance with reverse input end Both ends, the output terminal connection MCU of the operational amplifier.
- A kind of 2. Phantom Power circuit with diagnostic function as claimed in claim 1, it is characterised in that：The equivalent sampling electricity Resistance includes the first sampling resistor, the second sampling resistor and the 3rd sampling resistor.
- A kind of 3. Phantom Power circuit with diagnostic function as claimed in claim 2, it is characterised in that：The electricity of the power supply source Output terminal is pressed to connect one end of first sampling resistor and one end of second sampling resistor, first sampling resistor The other end connects one end of the microphone and the 3rd sampling resistor, the other end of second sampling resistor and described the The other end of three sampling resistors connects the noninverting input and reverse input end of the operational amplifier respectively.
- A kind of 4. Phantom Power circuit with diagnostic function as claimed in claim 3, it is characterised in that：The operational amplifier Reverse input end connect one end of the first feedback resistance, the other end of first feedback resistance connects the operational amplifier Output terminal.
- A kind of 5. Phantom Power circuit with diagnostic function as claimed in claim 4, it is characterised in that：The ADC moulds of the MCU Block connects the output terminal of the operational amplifier or the other end of first feedback resistance.
- A kind of 6. Phantom Power circuit with diagnostic function as described in claim 1 or 5, it is characterised in that：The computing is put Greatly the second feedback resistance is connected between the noninverting input of device and the ground terminal of the power supply source.
- A kind of 7. Phantom Power circuit with diagnostic function as described in claim 1 or 5, it is characterised in that：The computing is put Big device selects INA214BID.
- A kind of 8. Phantom Power circuit with diagnostic function as claimed in claim 5, it is characterised in that：The ADC module Voltage sample scope is 0-3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720725615.XU CN207369299U (en) | 2017-06-21 | 2017-06-21 | A kind of Phantom Power circuit with diagnostic function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720725615.XU CN207369299U (en) | 2017-06-21 | 2017-06-21 | A kind of Phantom Power circuit with diagnostic function |
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| CN207369299U true CN207369299U (en) | 2018-05-15 |
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ID=62424146
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720725615.XU Active CN207369299U (en) | 2017-06-21 | 2017-06-21 | A kind of Phantom Power circuit with diagnostic function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149525A (en) * | 2018-11-05 | 2019-01-04 | 浙江禾川科技股份有限公司 | A kind of shorted to earth protective device and inverter system |
| CN113573227A (en) * | 2021-08-03 | 2021-10-29 | Tcl通讯（宁波）有限公司 | Microphone fault detection system, microphone fault detection method, electronic device and storage medium |
| CN114786112A (en) * | 2022-06-22 | 2022-07-22 | 广州市保伦电子有限公司 | Equipment detection device of external phantom power supply simulation microphone |
-
2017
- 2017-06-21 CN CN201720725615.XU patent/CN207369299U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149525A (en) * | 2018-11-05 | 2019-01-04 | 浙江禾川科技股份有限公司 | A kind of shorted to earth protective device and inverter system |
| CN113573227A (en) * | 2021-08-03 | 2021-10-29 | Tcl通讯（宁波）有限公司 | Microphone fault detection system, microphone fault detection method, electronic device and storage medium |
| CN113573227B (en) * | 2021-08-03 | 2023-12-12 | Tcl通讯（宁波）有限公司 | Microphone fault detection system, detection method thereof, electronic device and storage medium |
| CN114786112A (en) * | 2022-06-22 | 2022-07-22 | 广州市保伦电子有限公司 | Equipment detection device of external phantom power supply simulation microphone |
| CN114786112B (en) * | 2022-06-22 | 2022-10-11 | 广州市保伦电子有限公司 | Equipment detection device of external phantom power supply simulation microphone |
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