CN209390372U - A kind of coil temperature rise test macro - Google Patents
A kind of coil temperature rise test macro Download PDFInfo
- Publication number
- CN209390372U CN209390372U CN201822180793.6U CN201822180793U CN209390372U CN 209390372 U CN209390372 U CN 209390372U CN 201822180793 U CN201822180793 U CN 201822180793U CN 209390372 U CN209390372 U CN 209390372U
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- Prior art keywords
- circuit
- voltage
- voice coil
- temperature rise
- connect
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Abstract
The utility model relates to a kind of coil temperature rise test macros, the power amplifier being connect including output end with voice coil, it further include constant-current source circuit and DC amplification circuit, the output end of constant-current source circuit is connect with voice coil, the voice coil of loudspeaker is connect with DC amplification circuit, and DC amplification circuit can filter out the alternating voltage at voice coil both ends and amplify DC voltage therein.The coil temperature rise test macro of the utility model can accurately obtain coil temperature rise.
Description
Technical field
The utility model relates to a kind of device for testing temperature rise more particularly to a kind of coil temperature rise test macros.
Background technique
Currently, popularizing with intelligent power output amplification, in order to preferably control the performance of loudspeaker and motor, needs loudspeaker
It is input to inside intelligent power output amplification and goes with the parameters of motor.The most important index of one of them is exactly the temperature rise curve ginseng of coil
Number.Because needing to export different power in different situations according to temperature curve parameter when intelligent power output amplification works, with hair
Wave the maximum performance of load, at the same avoid the voice coil of loudspeaker be unlikely to temperature it is excessively high and damage load.
Currently, more commonly used measurement method is by real-time measurement resistance in the test method of voice coil temperature rise
And the temperature rise of voice coil is extrapolated according to the method for the difference of front and back resistance, specific test mode can refer to Patent No.
200620100958.9, the Chinese patent of entitled " Multi-channel loudspeaker service life and voice coil temperature monitor ".When practical application,
There are biggish defects for this measurement method, the reason is that D.C. resistance is difficult accurately to be surveyed when AC and DC mixing
Examination, so that the temperature rise of coil cannot be accurately obtained.
Utility model content
In order to solve the above technical problems, the purpose of the utility model is to provide the lines that one kind can accurately obtain coil temperature rise
Coil temperature rise test macro, the coil temperature rise test macro of the utility model by the exchange in removal voice coil output voltage at
Point, DC voltage therein is accurately tested out, so that the coil temperature speculated by DC voltage
It rises more acurrate.
The coil temperature rise test macro of the utility model, including the power amplifier that output end is connect with voice coil, also
Including constant-current source circuit and DC amplification circuit, the output end of the constant-current source circuit is connect with the voice coil, loudspeaker
Voice coil connect with the DC amplification circuit, the DC amplification circuit can filter out the alternating current at voice coil both ends
It presses and amplifies DC voltage therein.
Further, the coil temperature rise test macro of the utility model, between the DC amplification circuit and voice coil
It is additionally provided with partial pressure difference channel.
Further, the coil temperature rise test macro of the utility model, the partial pressure difference channel and DC amplification circuit
Between be additionally provided with voltage buck circuit, the voltage buck circuit is for offsetting voice coil when power amplifier output is 0
Initial DC voltage.
Further, the coil temperature rise test macro of the utility model, further includes adc circuit and embedded system, described
The input terminal of adc circuit and the output end of DC amplification circuit connect, and the output end of adc circuit is connect with embedded system, institute
Embedded system is stated also to connect with the power amplifier.
Further, the coil temperature rise test macro of the utility model, further includes capacitor array, and the one of the capacitor array
End is connect with the output end of power amplifier, and the other end of capacitor array is connect with voice coil.
According to the above aspect of the present invention, the utility model at least has the following advantages: the coil temperature rise test macro of the utility model,
The setting of DC amplification circuit, so that the alternating voltage at voice coil both ends is able to be filtered out, DC voltage is amplified, to make
The DC voltage and its changing value of voice coil can accurately be tested out by obtaining subsequent vdct device, and according to this
The changing value of DC voltage push away voice coil temperature change value.In conclusion the coil temperature rise of the utility model tests system
System can more accurately test temperature rise when coil working.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and can be implemented in accordance with the contents of the specification, below on the preferred embodiment of the present invention and the accompanying drawings in detail
It describes in detail bright as after.
Detailed description of the invention
Fig. 1 is the structural block diagram of the coil temperature rise test macro of the utility model；
Fig. 2 is the circuit diagram of constant-current source circuit；
Fig. 3 is the circuit diagram for dividing difference channel；
Fig. 4 is the circuit diagram of DC amplification circuit；
Fig. 5 is the circuit diagram of capacitor array.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
Referring to Fig. 1 to Fig. 5, the coil temperature rise test macro of one preferred embodiment of the utility model, including output end and sound
The power amplifier of frequency coil connection, further includes constant-current source circuit and DC amplification circuit, the output end of the constant-current source circuit
It is connect with the voice coil, the voice coil of loudspeaker is connect with the DC amplification circuit, the DC amplification circuit energy
It enough filters out the alternating voltage at voice coil both ends and amplifies DC voltage therein.
The setting of DC amplification circuit, so that the alternating voltage at voice coil both ends is able to be filtered out, DC voltage is put
Greatly, so that subsequent vdct device can accurately test out DC voltage and its variation of voice coil
Value, and according to the changing value of the DC voltage push away voice coil temperature change value.When concrete application, DC amplification circuit is such as
Shown in attached drawing 4, the positive input of difference amplifier U3 is connect by R8 with the alternating current-direct current signal source that voice coil exports, reversed
Input terminal passes sequentially through resistance R12 and bulky capacitor and connect with alternating current-direct current signal source, wherein bulky capacitor is by capacitor C2, C3, C5, C6
Parallel connection obtains, output end by R15, R16 partial pressure output to amplifier U8 positive input, the output end of amplifier U8 and its
Between reverse input end and it is connected with resistance and capacitor, resistance R22, capacitor C27, C28, reverse input end also passes through R21
It is connected to ground, specific work process is as follows:
Alternating current-direct current signal enters 3 feet of U3 by R8, it is assumed that alternating current-direct current signal S=Sac+Sdc, due to the input impedance of U3
It is the Europe G grade, input impedance is very big, so the voltage of U3 is equal to S3=Sac+Sdc；Simultaneously S signal by bulky capacitor and
2 feet of R12 to U3, since the blocking of bulky capacitor acts on, the signal S2=Sac of 2 feet of U3, due to being difference amplifier, U3's is defeated
Signal (6 foot) S6=(S3-S2) * Gain of outlet, wherein Gain is the amplification factor of difference amplifier itself, i.e. S6=Sdc*
Gain.The amplification to direct current signal, the removal to AC signal are just realized in this way.In addition, the setting of amplifier U8, is played to friendship
Stream signal further suppresses, to the methodological function of direct current signal.Specifically, C27, C28 are equivalent to for AC signal
Short circuit, U8 are equivalent to voltage follower for AC signal, i.e., it is 1 to the gain of alternating voltage, and direct current is believed
Number, C27, C28 are equivalent to open circuit, and amplifier handles positive amplification, gain 1+R22/R21；It is just equivalent in this way and inhibits friendship
Signal is flowed, is exaggerated direct current signal, amplified direct current signal is sampled by subsequent ADC, improves test accuracy.
From above description it is found that alternating voltage by the difference of difference amplifier U3 and amplifier U8 to DC voltage into one
Step amplification, so that the alternating voltage in voice coil is able to filter out, DC voltage is amplified, so that subsequent DC voltage is surveyed
Trial assembly, which is set, can accurately test out DC voltage value, and according to the DC voltage value tested out further push away coil temperature
It rises.
Wherein, power amplifier, constant-current source circuit are all the prior art, and power amplifier is used for voice coil output work
Rate, constant-current source circuit is for exporting constant current.
Further, the coil temperature rise test macro of the utility model, between the DC amplification circuit and voice coil
It is additionally provided with partial pressure difference channel.
The setting for dividing difference channel, for testing the voltage at coil both ends.The voltage includes flip-flop and exchange into
Point, due to voice coil output voltage value it is larger, and its subsequent conditioning circuit include DC amplification circuit, voltage buck circuit it is defeated
Enter to be limited in scope, therefore, the voltage at voice coil both ends can be down to DC amplification circuit, voltage offset by partial pressure difference channel
The input range of circuit, as shown in Fig. 3, the electricity that voice coil is exported by the resistor network that R13, R14, R19, R20 are formed
Pressure is divided, and the voltage after partial pressure carries out differential amplification by difference amplifier U7, to improve the accurate of its output voltage
Degree.
Further, the coil temperature rise test macro of the utility model, the partial pressure difference channel and DC amplification circuit
Between be additionally provided with voltage buck circuit, the voltage buck circuit is for offsetting voice coil when power amplifier output is 0
Initial DC voltage.
The initial DC voltage is generated by constant-current source.When power amplifier export to voice coil power be 0 when, constant current
The electric current of source circuit output generates an initial voltage V on voice coil0, when the output of power amplifier gradually rises from 0,
Since temperature raises, resistance becomes larger voice coil, and since DC current remains unchanged, DC voltage gradually becomes
Greatly, changing value is Δ V, due to V0Value be much larger than the value of Δ V, therefore in order to accurately measure the value of Δ V, it would be desirable to will be first
Beginning voltage V0It filters out, therefore voltage buck circuit is set herein to offset initial voltage V0, when actual implementation, the partial pressure difference
Circuit is direction and V0Opposite voltage source, to offset V0, it is preferred that partial pressure difference channel is variable voltage source, and it can be with
Controller connection, variable voltage source are adjusted to and initial voltage V under control of the controller0Voltage contrary, value is equal,
To realize negative function.Wherein, controller can be the embedded system using embedded chip as core, can pass through partial pressure
Difference channel obtains initial value V0。
Further, the coil temperature rise test macro of the utility model, further includes adc circuit and embedded system, described
The input terminal of adc circuit and the output end of DC amplification circuit connect, and the output end of adc circuit is connect with embedded system, institute
Embedded system is stated also to connect with the power amplifier.
ADC is used to receive the output signal of DC amplification circuit and is translated into the number letter being adapted to embedded system
Number, embedded system receive after the signal according to the data push away voice coil temperature rise data and realized by power amplifier
To the feedback control of voice coil, prevent it from damaging due to overheat.
Further, the coil temperature rise test macro of the utility model, further includes capacitor array, and the one of the capacitor array
End is connect with the output end of power amplifier, and the other end of capacitor array is connect with voice coil.
The setting of capacitor array, it is therefore prevented that influence of the direct current of constant-current source circuit output to power amplifier.
When it is implemented, the output power of power amplifier is first set as 0, the alternating current on voice coil is loaded at this time
Pressure is 0, and then according to the size of load, switching to suitable electric current by constant-current source circuit, (size of electric current is according to right
Voice coil does not generate subject to temperature influence), initial voltage V is just produced in this way on voice coil0, ARM embedded system
Voltage buck circuit can be utilized, so that the voltage of adc circuit is 0, the gain of power amplifier is then adjusted, so that voice coil
The alternating voltage at both ends is to setting value, and as the temperature gradually increases, the resistance of voice coil also can slowly become larger, due to direct current
The size of electric current is basically unchanged, and the voltage at voice coil both ends becomes larger therewith, by dividing difference channel, voltage buck circuit,
DC amplification circuit, so that the input voltage of adc circuit increases Δ V.According to general formula Δ T=(Rt-R0)/(ɑ*R0), wherein
ɑ is temperature coefficient, and material fixation is fixed value, RtIt is resistance of the voice coil in t moment, R0For the initial electricity of voice coil
Resistance.This formula is done into a transformation, Δ T=I* (Rt-R0)/I*(ɑ*R0), it is Δ T=I* (Rt--R0)/(ɑ*I*R0), molecule
Denominator colleague is as a result constant multiplied by a constant, then I* (Rt-R0) it is exactly Δ V, (I*R measured by the present embodiment0) be exactly
Initial voltage V0, thus obtained Δ T.Due to initial voltage V0Numerical value it is larger, and by temperature rise bring voltage change Δ V
Numerical value is compared with initial voltage V0Numerical value it is much smaller, therefore need that voltage buck circuit is arranged herein, to offset constant-current source generation
Initial voltage V0Influence to test result.Simultaneously on the one hand the setting of DC amplification circuit eliminates the interference of AC signal,
DC voltage is amplified simultaneously, from the precision for increasing temperature test.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, those skilled in the art can be with other specific shapes
Formula realizes the utility model.It therefore, in all respects, the embodiments should be taken as exemplary, and is non-limit
Property processed, the protection scope of the utility model is indicated by the appended claims rather than the foregoing description.
In addition, the above is only the preferred embodiment of the utility model, it is not intended to limit the utility model, it should
It points out, for those skilled in the art, without deviating from the technical principle of the utility model, may be used also
To make several improvements and modifications, these improvements and modifications also should be regarded as the protection scope of the utility model.Meanwhile it should manage
Solution, although this specification is described in terms of embodiments, but not each embodiment only includes an independent technical side
Case, this description of the specification is merely for the sake of clarity, and those skilled in the art should be whole using specification as one
Body, the technical solutions in the various embodiments may also be suitably combined, formed it will be appreciated by those skilled in the art that other implementation
Mode.
Claims (5)
1. a kind of coil temperature rise test macro, the power amplifier being connect including output end with voice coil, it is characterised in that: also
Including constant-current source circuit and DC amplification circuit, the output end of the constant-current source circuit is connect with the voice coil, loudspeaker
Voice coil connect with the DC amplification circuit, the DC amplification circuit can filter out the alternating current at voice coil both ends
It presses and amplifies DC voltage therein.
2. coil temperature rise test macro according to claim 1, it is characterised in that: the DC amplification circuit and tone frequency channel wire
Partial pressure difference channel is additionally provided between circle.
3. coil temperature rise test macro according to claim 2, it is characterised in that: the partial pressure difference channel is put with direct current
Voltage buck circuit is additionally provided between big circuit, the voltage buck circuit is for offsetting sound when power amplifier output is 0
The initial DC voltage of frequency coil.
4. coil temperature rise test macro according to claim 3, it is characterised in that: further include adc circuit and embedded system
System, the input terminal of the adc circuit and the output end of DC amplification circuit connect, the output end and embedded system of adc circuit
Connection, the embedded system are also connect with the power amplifier.
5. coil temperature rise test macro according to claim 4, it is characterised in that: it further include capacitor array, the capacitor
One end of array and the output end of power amplifier connect, and the other end of capacitor array is connect with voice coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822180793.6U CN209390372U (en) | 2018-12-25 | 2018-12-25 | A kind of coil temperature rise test macro |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822180793.6U CN209390372U (en) | 2018-12-25 | 2018-12-25 | A kind of coil temperature rise test macro |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209390372U true CN209390372U (en) | 2019-09-13 |
Family
ID=67873781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822180793.6U Expired - Fee Related CN209390372U (en) | 2018-12-25 | 2018-12-25 | A kind of coil temperature rise test macro |
Country Status (1)
| Country | Link |
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| CN (1) | CN209390372U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110913323A (en) * | 2019-11-30 | 2020-03-24 | 航天科技控股集团股份有限公司 | Method for detecting heat dissipation performance of vehicle-mounted power amplifier |
-
2018
- 2018-12-25 CN CN201822180793.6U patent/CN209390372U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110913323A (en) * | 2019-11-30 | 2020-03-24 | 航天科技控股集团股份有限公司 | Method for detecting heat dissipation performance of vehicle-mounted power amplifier |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190913 Termination date: 20211225 |
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| CF01 | Termination of patent right due to non-payment of annual fee |