CN208043927U - The power consumption test device of D class power amplifiers - Google Patents
The power consumption test device of D class power amplifiers Download PDFInfo
- Publication number
- CN208043927U CN208043927U CN201820044766.3U CN201820044766U CN208043927U CN 208043927 U CN208043927 U CN 208043927U CN 201820044766 U CN201820044766 U CN 201820044766U CN 208043927 U CN208043927 U CN 208043927U
- Authority
- CN
- China
- Prior art keywords
- low
- pass filter
- inductance
- filter unit
- oscillograph
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides a kind of power consumption test device of D classes power amplifier, including the low pass conversion module and oscillograph being connected, wherein low pass conversion module includes the first low-pass filter unit and the second low-pass filter unit；In a state of use, the first end of the first low-pass filter unit is connect with the first sound channel of D class power amplifiers, and the first end of the second low-pass filter unit is connect with the second sound channel of D class power amplifiers；The second end of first low-pass filter unit is connect with the input terminal of the input terminal of the first passage of oscillograph, the first loudspeaker simultaneously, and the second end of the second low-pass filter unit is connect with the input terminal of the input terminal of the second channel of oscillograph, the second loudspeaker simultaneously.The power consumption test device can both reflect the waveform of actual test source of sound by the oscillograph being directly connected to, and directly read the actually active voltage value of loudspeaker work, and be used directly for plant layout test, improve testing efficiency.
Description
Technical field
The utility model is related to power consumption test technical field more particularly to a kind of power consumption test devices of D classes power amplifier.
Background technology
In field of audio, people stand fast at always the true essence of A class power amplifiers, it is believed that the sound of A class power amplifiers is the most pure and fresh
It is bright, there is very high fidelity.But the poor efficiency of A class power amplifiers and high loss are the congenital persistent ailment that it can not overcome.B class work(
Although putting, efficiency is opposite to be improved very much, its actual efficiency is only 50% or so, in small portable stereo set, such as vapour
Vehicle power amplifier, laptop audio system and professional super high power power amplifier occasion, it is relatively low still to feel efficiency, unsatisfactory.Institute
With the D classes power amplifier of, ultrahigh in efficiency because it meets the trend of the green revolution, just paid attention to by various aspects.
Due to the development of integrated circuit technique, originally with discrete component make very complicated modulation circuit, now no matter
It has not been a problem technically or in price.And the development of digital sound technology in recent years, it has been found that D classes power amplifier with
In place of digital sound has many communicate, the advantages for development of D class power amplifiers are further displayed out.
The operation principle of D class power amplifiers is that analog audio signal is modulated into digital signal through PWM equipment, then amplifies, is low
After frequency filtering, demodulated signal, highly efficient power drive the speaker.Its integrated circuit is made of two parts：Pulsewidth modulation part and work(
Rate amplify and filtering part, wherein pulsewidth modulation part be by modulates audio signals at the period constant but change in duty cycle
Pwm signal；Power amplification and filtering part are operated in the state of high voltage, high current, are the main energy consumption portions of electroacoustic equipment
Point.
D classes power amplifier is because having many advantages, such as efficient, small, light-weight, output power, increasingly by the weight of people
Depending on especially in a portable device, already having the tendency that as a kind of irreplaceable product.But due to D class power amplifier categories
In numeric type, output is square wave, and the test source of sound of loudspeaker is generally the sine wave of 1KHz/0db, if directly being tested
The power of loudspeaker can not be correctly tested out, and need to restore practical source of sound by low-pass filtering, but in this way to test
It is just highly difficult for loudspeaker power.
For the loudspeaker power consumption test of D class power amplifiers driving, a kind of very easily test method or device currently not yet,
Mostly it is that one low-pass filter of engineer's do-it-yourself is connected between loudspeaker and power amplifier, the digital signal of D class power amplifiers output is turned
It changes analog signal into, then reconnects oscillograph and measure.Cannot fast and easily test horn power, the life to product
Certain adverse effect can all be caused by producing and using.
In addition, the D class power amplifiers test of a small amount of existing making is mostly half wave apparatus of single-pass, it can not actually reflect entire sine
The actually active power in Boeing source.
Utility model content
In view of the above-mentioned problems, the utility model aims to solve the problem that problem as described above.One purpose of the utility model is
A kind of power consumption test device solving any one of problem above is provided.Specifically, the utility model offer can be direct
Test the test device of D class power amplifier loudspeaker power consumptions.
In order to solve the above technical problems, the utility model provides a kind of power consumption test device of D classes power amplifier, power consumption test
Device includes the low pass conversion module and oscillograph being connected, wherein low pass conversion module include the first low-pass filter unit and
Second low-pass filter unit；In a state of use, the first end of the first low-pass filter unit and the first sound channel of D class power amplifiers connect
It connects, the first end of the second low-pass filter unit is connect with the second sound channel of D class power amplifiers；The second end of first low-pass filter unit is same
When and the input terminal of the input terminal of first passage of oscillograph, the first loudspeaker connect, the second end of the second low-pass filter unit is same
When and the input terminal of the input terminal of second channel of oscillograph, the second loudspeaker connect.
Wherein, power consumption test device further includes pcb board, and the first low-pass filter unit and the second low-pass filter unit are respectively provided with
On pcb board.
Wherein, at least two-way power amplifier connecting terminal, at least two-way loudspeaker connecting terminal and at least two-way are provided on pcb board
Oscillograph connecting terminal.
Wherein, the first low-pass filter unit includes the first inductance, the second inductance and the first capacitance, wherein the first inductance
First input end of the first end as the first low-pass filter unit, the first end of the second inductance is as the first low-pass filter unit
Second input terminal, the second end of the first inductance are connect with the first end of the first capacitance, the second end of the first capacitance and the second inductance
Second end connection；Also, the first test point and first of the second end of the first inductance while the first passage as oscillograph
The second test point and the first loudspeaker of first terminals of loudspeaker, the second end of the second inductance while the first passage as oscillograph
The second terminals.
Wherein, the first low-pass filter unit includes multiple the first inductance being sequentially connected in series, multiple the second electricity being sequentially connected in series
Sense and multiple the first capacitances being sequentially connected in series.
Wherein, the second low-pass filter unit includes third inductance, the 4th inductance and the second capacitance, wherein third inductance
First input end of the first end as the second low-pass filter unit, the first end of the 4th inductance is as the second low-pass filter unit
Second input terminal, the second end of third inductance are connect with the first end of the second capacitance, the second end of the second inductance and the 4th inductance
Second end connection；Also, the first test point and second of the second end of third inductance while the second channel as oscillograph
The second test point and the second loudspeaker of first terminals of loudspeaker, the second end of the 4th inductance while the second channel as oscillograph
The second terminals.
Wherein, the second low-pass filter unit includes multiple third inductance being sequentially connected in series, multiple the 4th electricity being sequentially connected in series
Sense and multiple the second capacitances being sequentially connected in series.
Power consumption test device provided by the utility model both can reflect actual test sound by the oscillograph being directly connected to
The waveform in source directly reads the actually active voltage value of loudspeaker work；Also, this power consumption test device be two-way all-wave device,
And include connecting terminal for test point, it is used directly for plant layout test, improves testing efficiency.
It is read with reference to the drawings being described below for exemplary embodiment, other property features of the utility model and excellent
Point will become apparent.
Description of the drawings
It is incorporated into specification and the attached drawing of a part for constitution instruction shows the embodiments of the present invention, and
And it is used to explain the principles of the present invention together with the description.In the drawings, similar reference numeral is for indicating similar
Element.The accompanying drawings in the following description is some embodiments of the utility model, rather than whole embodiments.It is general for this field
It, without creative efforts, can be obtain other attached drawings according to these attached drawings for logical technical staff.
Fig. 1 schematically illustrates the structural schematic diagram of the power consumption test device of the D class power amplifiers of the utility model.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature mutually can arbitrarily combine.
The basic thought of the utility model is, by using the additional test point of two-way low-pass filter circuit and connecting terminal,
Loudspeaker and oscillograph can be directly connected to carry out power consumption test；All-wave power, but also the reality of oscillograph can not only be tested
Test waveform is complete sine wave, and the effective voltage value read is used directly for power consumption calculation.Using the utility model
Power consumption test device be used directly in factory produce in batches, test, testing efficiency can be greatlyd improve.
Below in conjunction with the accompanying drawings, to being retouched in detail according to the power consumption test device of D classes power amplifier provided by the utility model
It states.
Fig. 1 shows the structural schematic diagram of the power consumption test device of D classes power amplifier described in the utility model, referring to Fig.1 institute
Show, J1 is boundary cross-talk in figure, can connect the output of D class power amplifiers, and T1, T2, T3, T4 are test point, is used directly for tooling folder
Tool contact exports to connect D class power amplifiers；Low-pass filter circuit, L3, L4 and C2 form another kind of low pass filtered to L1, L2 and C1 composition all the way
Wave circuit；T5, T6, T7 and T8 are the test point of oscillograph, can be used for wiring；J2 be two-way loudspeaker connecting terminal, T9,
T10, T11 and T12 are the test point of loudspeaker, are used directly for frock clamp to connect loudspeaker.
Specifically, which includes the low pass conversion module and oscillograph being connected, wherein low pass modulus of conversion
Block includes the first low-pass filter unit 11 and the second low-pass filter unit 12.D class power amplifiers pass through pair of two low-pass filter units
The input terminal of road low-pass filtering, oscillograph is connect with the output end of low pass conversion module, and the input terminal of loudspeaker is also converted with low pass
The output end of module connects, and the sine waveform of complete test D class power amplifiers can be shown in oscillograph, and directly reads loudspeaker
The actually active voltage value of work, to which the power of loudspeaker be calculated by the impedance of this voltage value and loudspeaker.For example,
The effective voltage value read in oscillograph is U, and the impedance of loudspeaker is R, then power P=U of loudspeaker2/R。
In a state of use, the first end of the first low-pass filter unit 11 is connect with the first sound channel of D class power amplifiers, and second is low
The first end of pass filtering unit 12 is connect with the second sound channel of D class power amplifiers；The second end of first low-pass filter unit 11 simultaneously with
The input terminal connection of the input terminal of the first passage of oscillograph, the first loudspeaker, the second end of the second low-pass filter unit 12 is simultaneously
It is connect with the input terminal of the input terminal of the second channel of oscillograph, the second loudspeaker.For example, the first of the first low-pass filter unit 11
End is connect with the L channel of D class power amplifiers, then the loudspeaker of its output end and L channel connect；The first of second low-pass filter unit 12
End is connect with the right channel of D class power amplifiers, then the loudspeaker of its output end and right channel connect.
In addition, the power consumption test device of the D class power amplifiers of the utility model further includes pcb board, the first low-pass filter unit 11
It is arranged on pcb board with the second low-pass filter unit 12, and corresponding connecting terminal and test point is set on pcb board,
The power consumption test device is integrated on one piece of pcb board, is directly connected to by connecting terminal and corresponding test point, not only
Technique easy to use, saving human weld's low-pass filter, and can be adapted for batch testing in factory, it greatlys improve
Testing efficiency.
Specifically, at least two-way power amplifier connecting terminal, at least two-way loudspeaker terminals should be correspondingly set on pcb board
Son and at least two-way oscillograph connecting terminal, respectively with two sound channels of D class power amplifiers, the loudspeaker of left and right acoustic channels, oscillograph two
A channel is attached, accurate test results and test waveform.
In the embodiment shown in fig. 1, the first low-pass filter unit 11 includes the first inductance L1, the second inductance L2 and first
Capacitance C1.Wherein, first input end of the first end of the first inductance L1 as the first low-pass filter unit 11, the second inductance L2's
Second input terminal of the first end as the first low-pass filter unit 11；The second end of first inductance L1 and the first of the first capacitance C1
End connection, the second end of the first capacitance C1 are connect with the second end of the second inductance L2；Also, the second end of the first inductance L1 is simultaneously
First test point of the first passage as oscillograph and the first terminals of the first loudspeaker, the second end of the second inductance L2 is simultaneously
Second test point of the first passage as oscillograph and the second terminals of the first loudspeaker.
In another typical embodiment, the first low-pass filter unit may include multiple the first electricity being sequentially connected in series
Sense, multiple the second inductance being sequentially connected in series and multiple the first capacitances being sequentially connected in series, wherein the first inductance after multiple series connection
First input end of the first end as the first low-pass filter unit, the first end of second end and the first capacitance after multiple connect
Connection, the first test lead of the first passage as oscillograph and the first terminals of the first loudspeaker use；After multiple series connection
Second input terminal of the second end of second inductance as the first low-pass filter unit, second end and the first electricity after multiple connect
The second end of appearance connects, and the second test point of the first passage as oscillograph and the second terminals of the first loudspeaker use.
Adaptably, the second low-pass filter unit 12 includes third inductance L3, the 4th inductance L4 and the second capacitance C2,
In, the first end of the first input end of the first end of third inductance L3 as the second low-pass filter unit 12, the 4th inductance L4 is made
For the second input terminal of the second low-pass filter unit 12, the second end of third inductance L3 is connect with the first end of the second capacitance C2,
The second end of second capacitance C2 is connect with the second end of the 4th inductance L4；Also, the second end of third inductance L3 is used as simultaneously to be shown
First test point of the second channel of wave device and the first terminals of the second loudspeaker, the second end of the 4th inductance L4 is used as simultaneously to be shown
Second test point of the second channel of wave device and the second terminals of the second loudspeaker.
Specifically, the second low-pass filter unit may include multiple third inductance being sequentially connected in series, multiple be sequentially connected in series
4th inductance and multiple the second capacitances being sequentially connected in series, wherein the first end of the third inductance after multiple series connection is low as second
The first input end of pass filtering unit, second end is connect with the first end of the second capacitance after multiple series connection, as oscillograph
Second channel the first test lead and the second loudspeaker the first terminals use；The second end of the 4th inductance after multiple series connection
As the second input terminal of the second low-pass filter unit, second end is connect with the second end of the second capacitance after multiple series connection,
And the second test point of the second channel as oscillograph and the second terminals of the second loudspeaker use.
Descriptions above can combine implementation individually or in various ways, and these variants all exist
Within the scope of protection of the utility model.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion so that article or equipment including a series of elements include not only those elements, but also is wrapped
Other elements that are not explicitly listed are included, or further include for this article or the intrinsic element of equipment.Do not having more
In the case of more limitations, the element that is limited by sentence " including ... ", it is not excluded that including the element article or set
There is also other identical elements in standby.
Above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, reference only to preferred embodiment pair
The utility model is described in detail.It will be understood by those of ordinary skill in the art that can be to the technology of the utility model
Scheme is modified or replaced equivalently, and without departing from the spirit and scope of technical solutions of the utility model, should all be covered at this
In the right of utility model.
Claims (7)
1. a kind of power consumption test device of D classes power amplifier, which is characterized in that the power consumption test device includes that the low pass being connected turns
Change the mold block and oscillograph, wherein the low pass conversion module includes the first low-pass filter unit and the second low-pass filter unit；
In a state of use, the first end of first low-pass filter unit is connect with the first sound channel of the D classes power amplifier, described
The first end of second low-pass filter unit is connect with the second sound channel of the D classes power amplifier；The of first low-pass filter unit
Two ends are connect with the input terminal of the input terminal of the first passage of the oscillograph, the first loudspeaker simultaneously, second low-pass filtering
The second end of unit is connect with the input terminal of the input terminal of the second channel of the oscillograph, the second loudspeaker simultaneously.
2. power consumption test device as described in claim 1, which is characterized in that the power consumption test device further includes pcb board, institute
It states the first low-pass filter unit and second low-pass filter unit is arranged on the pcb board.
3. power consumption test device as claimed in claim 2, which is characterized in that be provided at least two-way power amplifier on the pcb board
Connecting terminal, at least two-way loudspeaker connecting terminal and at least two-way oscillograph connecting terminal.
4. power consumption test device as described in claim 1, which is characterized in that first low-pass filter unit includes the first electricity
Sense, the second inductance and the first capacitance, wherein the first end of first inductance as first low-pass filter unit first
Input terminal, the second input terminal of the first end of second inductance as first low-pass filter unit, first inductance
Second end connect with the first end of first capacitance, the second end of the second end of first capacitance and second inductance
Connection；Also, the first test point and first of the second end of first inductance while the first passage as the oscillograph
Second test point of the first terminals of loudspeaker, the second end of second inductance while the first passage as the oscillograph
With the second terminals of the first loudspeaker.
5. power consumption test device as described in claim 1, which is characterized in that first low-pass filter unit include it is multiple according to
Secondary concatenated first inductance, multiple the second inductance being sequentially connected in series and multiple the first capacitances being sequentially connected in series.
6. power consumption test device as described in claim 1, which is characterized in that second low-pass filter unit includes third electricity
Sense, the 4th inductance and the second capacitance, wherein the first end of the third inductance as second low-pass filter unit first
Input terminal, the second input terminal of the first end of the 4th inductance as second low-pass filter unit, the third inductance
Second end connect with the first end of second capacitance, the second end of the second end of second inductance and the 4th inductance
Connection；Also, the first test point and second of the second end of the third inductance while the second channel as the oscillograph
Second test point of the first terminals of loudspeaker, the second end of the 4th inductance while the second channel as the oscillograph
With the second terminals of the second loudspeaker.
7. power consumption test device as described in claim 1, which is characterized in that second low-pass filter unit include it is multiple according to
Secondary concatenated third inductance, multiple the 4th inductance being sequentially connected in series and multiple the second capacitances being sequentially connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820044766.3U CN208043927U (en) | 2018-01-11 | 2018-01-11 | The power consumption test device of D class power amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820044766.3U CN208043927U (en) | 2018-01-11 | 2018-01-11 | The power consumption test device of D class power amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208043927U true CN208043927U (en) | 2018-11-02 |
Family
ID=63956660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820044766.3U Active CN208043927U (en) | 2018-01-11 | 2018-01-11 | The power consumption test device of D class power amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208043927U (en) |
-
2018
- 2018-01-11 CN CN201820044766.3U patent/CN208043927U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101790122B (en) | Plosive eliminating circuit of audio system and mobile communication terminal | |
| CN1694356B (en) | Method and apparatus for self-oscillating differential feedback class-D amplifier | |
| CN102118668B (en) | Loudspeaker system and loudspeaker driving circuit | |
| CN208043927U (en) | The power consumption test device of D class power amplifiers | |
| CN106953608B (en) | Power amplifier device | |
| CN101378602A (en) | Display acoustics circuit | |
| CN204539441U (en) | LC loudspeaker enclosure divider | |
| CN206807738U (en) | The audio frequency phase switching circuit and sound equipment of power amplifier | |
| CN110972044A (en) | Loudspeaker control circuit and audio playing device | |
| CN215773545U (en) | Direct current servo circuit | |
| CN207070359U (en) | A kind of loudspeaker power amplifier test device | |
| CN101977347A (en) | Measuring method and measuring circuit for temperature rise of voice coil of dynamic speaker | |
| CN202261797U (en) | System for testing reliability of piezoelectric ceramic loudspeaker | |
| CN109495811A (en) | Speaker | |
| CN211321499U (en) | Loudspeaker control circuit and audio playing device | |
| CN202634678U (en) | Noise-reduction circuit | |
| CN203734825U (en) | Audio signal processing circuit and audio playing device | |
| CN209089214U (en) | Audio input circuit and power amplifier audio system | |
| CN205039780U (en) | Take dual power supply's dual track audio power amplifier circuit | |
| CN113630688B (en) | Direct current servo circuit | |
| CN201846466U (en) | USB loudspeaker box having function of eliminating low frequency noise | |
| CN204731328U (en) | A kind of acquiring electric energy information device | |
| CN201656921U (en) | Filter circuit | |
| CN203942638U (en) | A kind of audio input circuit | |
| CN218331739U (en) | Signal distortion degree measuring system of MCU based on TI company |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |