CN209250889U - Power amplifier test circuit and equipment - Google Patents
Power amplifier test circuit and equipment Download PDFInfo
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- CN209250889U CN209250889U CN201920216700.2U CN201920216700U CN209250889U CN 209250889 U CN209250889 U CN 209250889U CN 201920216700 U CN201920216700 U CN 201920216700U CN 209250889 U CN209250889 U CN 209250889U
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Abstract
The utility model discloses a power amplifier test circuit and equipment relates to electronic circuit technical field. This power amplifier test circuit includes: the power amplifier, the load module and the change-over switch module; the first end of the load module is electrically connected with the first output end of the power amplifier, and the second end of the load module is electrically connected with the second output end of the power amplifier through the change-over switch module; the switch module is used for switching a load resistor of the load module so as to detect the power amplifier. The utility model provides an examine time measuring to power amplifier among the prior art, need the artifical resistance that switches different resistances, lead to test circuit complicated, problem that efficiency of software testing is low, the utility model discloses a power amplifier test circuit is simple, and load resistance switches portably, and efficiency of software testing is high, and is with low costs.
Description
Technical field
The utility model embodiment is related to electronic circuit technology field more particularly to a kind of power amplifier test circuit and equipment.
Background technique
Power amplifier is the abbreviation of power amplifier, is commonly called as sound amplifier, is equipment most basic in sound system, main function
It is that the ultra-weak electronic signal from signal source is amplified to make a sound with drive the speaker.Power amplifier rises in entire sound system
The pivotal role for having arrived tissue, having coordinated is the key that can entire sound system provide good sound quality output.
The performance of power amplifier directly affects the output sound quality of sound system, therefore before power amplifier comes into operation, to power amplifier performance
It tests most important.Power amplifier has to connection load when testing, and since the effect of power amplifier is that drive the speaker makes a sound, function
The load put is usually loudspeaker.Noise pollution is formed compared with loud noise in order to avoid issuing, is generallyd use comparable with loudspeaker impedances
Resistance serves as the load of power amplifier.Loudspeaker needed for power amplifier test are all kinds of, and the impedance of each loudspeaker has difference.It is surveyed in power amplifier
When examination, the loudspeaker of the resistance substitution respective impedance using different resistance values are needed to be linked into test circuit, and by opening accordingly
The resistance for going to be switched to required resistance value is closed, is tested with the performance to power amplifier.
But in power amplifier test, the loudspeaker of multiple and different impedances correspond to the resistance of multiple and different resistance values, and the volume of resistance
It is larger with quality, it thus will increase the complexity of the volume and power amplifier test circuit of test equipment, cause testing efficiency low
Utility model content
In view of this, the utility model embodiment provides a kind of power amplifier test circuit and equipment, it is able to solve existing skill
Power amplifier test equipment volume is big in art, tests the low technical problem of testing efficiency caused by circuit complexity.
In a first aspect, the utility model embodiment provides a kind of power amplifier test circuit, comprising: power amplifier, load
Module and switching switch module；
Wherein, the first end of the load blocks is electrically connected with the first output end of the power amplifier, the load
The second end of module is electrically connected by the switching switch module with the second output terminal of the power amplifier；
The switching switch module is used to switch the load resistance of the load blocks, to carry out to the power amplifier
Detection.
Optionally, the load blocks include: first resistor, second resistance and 3rd resistor；
The first end of the first resistor is electrically connected with the first output end of the power amplifier, the first resistor
Second end is electrically connected by the switching switch module with the second output terminal of the power amplifier；
The first end of the second resistance is electrically connected with the second end of the first resistor, the second end of the second resistance
It is electrically connected by the switching switch module with the second output terminal of the power amplifier；
The first end of the 3rd resistor is electrically connected with the first output end of the power amplifier, the 3rd resistor
Second end is electrically connected by the switching switch module with the second output terminal of the power amplifier.
Optionally, the resistance value phase of the resistance value of the first resistor, the resistance value of the second resistance and the 3rd resistor
Deng.
Optionally, the switching switch module includes: first switch and the second switch；
The first resistor passes through the first switch and the second switch and the second output terminal of power amplifier electricity
Connection；The second end of the second resistance is electrically connected by the second switch with the second output terminal of the power amplifier；
The second end of the 3rd resistor is electrically connected by the second switch with the second output terminal of the power amplifier；
The first switch is in parallel with the 3rd resistor for controlling the first resistor；
The second switch is used to control the second of the second resistance and the 3rd resistor and the power amplifier
The electrical connection of output end.
Optionally, the first switch includes: first end and second end；The second switch includes: first contact point,
Two contact points and third contact point；
The first end of the first switch connects the second end of the first resistor and the first end of the second resistance, institute
The second end for stating first switch connects the second end of the 3rd resistor and the second contact point of the second switch；
The first contact point of the second switch connects the second end of the second resistance, and, the second switch
Third contact point connects the second output terminal of the power amplifier.
Optionally, the first switch is single-pole single-throw switch (SPST)；The second switch is single-pole double-throw switch (SPDT).
Optionally, the first switch is single-pole single-throw switch (SPST)；The second switch is relay.
Optionally, the power amplifier tests circuit further include: prime amplification module；
The input terminal of the prime amplification module is electrically connected with audio input end, the first output of the prime amplification module
End is electrically connected with the first input end of the power amplifier, and second output terminal and the power of the prime amplification module are put
The second input terminal electrical connection of big device；
The prime amplification module is used to the audio signal that the audio input end inputs being converted to electric signal, and carries out
The power amplifier is input to after prime amplification.
Optionally, the power amplifier tests circuit further include: test module；
The first input end of the test module is electrically connected with the first output end of the power amplifier, the test mould
Second input terminal of block is electrically connected with the second output terminal of the power amplifier；The test module is for testing the power
The electric signal of amplifier output.
Optionally, the test module includes: multimeter；
The first input end of the multimeter connects the first output end of the power amplifier, and the second of the multimeter
Input terminal connects the second output terminal of the power amplifier.
Optionally, the test module includes: oscillograph；
The first input end of the oscillograph connects the first output end of the power amplifier, and the second of the oscillograph
Input terminal connects the second output terminal of the power amplifier.
Second aspect, the utility model embodiment additionally provide a kind of power amplifier test equipment, which includes:
Power amplifier as described in relation to the first aspect tests circuit.
The first end of load blocks is electrically connected by the utility model with the first output end of power amplifier, load blocks
Second end is electrically connected by switching switch module with the second output terminal of power amplifier, so as to pass through switching switch module
The load resistance for switching load blocks, is detected with the performance to power amplifier, that is, solved in the prior art to power
When amplifier is detected, the resistance of manual switching difference resistance value is needed, causes to test circuit complexity, testing efficiency is low to ask
The power amplifier test circuit of topic, the utility model is simple, and load resistance switching is easy, and testing efficiency is high, at low cost.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of power amplifier test circuit provided by the embodiment of the utility model；
Fig. 2 is a kind of particular circuit configurations schematic diagram of load blocks provided by the embodiment of the utility model；
Fig. 3 is a kind of particular circuit configurations schematic diagram for switching switch module provided by the embodiment of the utility model；
Fig. 4 is a kind of structural schematic diagram of load resistance circuit provided by the embodiment of the utility model；
Fig. 5 is the structural schematic diagram of another load resistance circuit provided by the embodiment of the utility model；
Fig. 6 is the structural schematic diagram of another load resistance circuit provided by the embodiment of the utility model；
Fig. 7 is the structural schematic diagram of another load resistance circuit provided by the embodiment of the utility model；
Fig. 8 is the particular circuit configurations schematic diagram of another switching switch module provided by the embodiment of the utility model；
Fig. 9 is the structural schematic diagram of another power amplifier test circuit provided by the embodiment of the utility model；
Figure 10 is the structural schematic diagram of another power amplifier test circuit provided by the embodiment of the utility model；
Figure 11 is a kind of structural schematic diagram of power amplifier test equipment provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.Do not conflicting
In the case where, the feature in the utility model embodiment and embodiment can be combined with each other.
Referring to Fig.1, a kind of structural schematic diagram of power amplifier test circuit of the utility model embodiment is shown.The power amplifier is surveyed
Examination circuit 100 may include: power amplifier 10, load blocks 20 and switching switch module 30.Wherein, the of load blocks 20
One end Vi20 is electrically connected with the first output end sig+ of power amplifier 10, and the second end Vo20 of load blocks 20 is opened by switching
Module 30 is closed to be electrically connected with the second output terminal sig- of power amplifier 10；Switching switch module 30 is for switching load blocks 20
Load resistance, to be detected to power amplifier 10.
In the present embodiment, power amplifier is the abbreviation of power amplifier 10, which includes at least two output ends,
That is the first output end sig+ and second output terminal sig-.Wherein, the first output end sig+ is the positive output of power amplifier 10
End, second output terminal sig- is the inverse output terminal of power amplifier 10, and the first output end can be in other embodiments
The inverse output terminal of power amplifier 10, second output terminal can be the positive output end of power amplifier 10.Power amplifier
10 output power, frequency response, the distortion factor, signal-to-noise ratio, output impedance and damped coefficient can measure power amplifier 10
Performance.Wherein, by testing and calculating the output power of power amplifier 10, to measure the performance of power amplifier 10.Function
The output power of rate amplifier 10 refers to that power amplifier 10 can be exported to the power of load, and the load of power amplifier 10
Usually loudspeaker, to eliminate the noise generated when test by sound horn, using resistance identical as the load of power amplifier 10
Anti- load resistance is substituted.
Since the output power of different capacity amplifier 10 has the different operating of difference or same power amplifier 10
Mode has difference in output power, this just needs to choose different loads and surveys to the output power of power amplifier 10
Examination.The load resistance of load blocks 20 is switched to corresponding resistance value by switching switch module 30, is put with detecting different capacity
Output power under 10 different working modes of output power or same power amplifier of big device 10.
To sum up, power amplifier provided in an embodiment of the present invention tests circuit, can be by switching in the switching switch module 30
Switch is opened and is turned off, come control load blocks 20 load resistor value switching, and then can be in different loads resistance value
Situation detection meets the testing requirement of power amplifier to power amplifier, and improves testing efficiency.
In the concrete realization, switching switch module 30 can switch during detecting to power amplifier 10
The load resistance of load blocks 20, such as can by switch one or more switches in the switching switch module 30 open with
Shutdown, to switch the circuit connection state of the load resistance in load blocks 20, changes load blocks 20 so as to switch out
Different loads resistance value.
Specifically, the load resistance of load blocks 20 can switch under the control of switching switch module 30, so that
Load blocks 20 show different resistance values, adapt to the power under different power amplifier 10 or adaptation different working modes
Amplifier 10.Switched the resistance value R of the load resistance for the load blocks 20 that switch module 30 is switched it is known that and power amplifier
There is pressure difference U between the electric signal of 10 the first output end sig+ and second output terminal sig- output, thus, it is possible to calculate function
The output power P of rate amplifier 10, such as following formula:
In above formula, the output power P of power amplifier 10 calculated can be used for measuring the performance of power amplifier 10.
Thereby, it is possible to by simple circuit, as a result, the performance of measured power amplifier 10, and the load resistance of load blocks 20 is logical
It crosses switching switch module 30 to switch over, can adapt to the power amplifier 10 of different requirements, and then improve power amplifier
Testing efficiency reduces the testing cost of power amplifier.
It should be noted that the load resistance of load blocks 20 can show different resistance values, it is not load blocks
20 resistance with multiple and different resistance values, but load blocks 20 can be negative by switching the switching effect realization of switch module 30
Carry the switching of resistance difference resistance value.
In the utility model an optional embodiment, optionally, as shown in Fig. 2, load blocks 20 include: the first electricity
Hinder R1, second resistance R2 and 3rd resistor R3.Wherein, the first output end of the first end of first resistor R1 and power amplifier 10
Sig+ electrical connection, the second output terminal sig- that the second end of first resistor R1 passes through switching switch module 30 and power amplifier 10
Electrical connection；The first end of second resistance R2 is electrically connected with the second end of first resistor R1, and the second end of second resistance R2 is by cutting
Switch module 30 is changed to be electrically connected with the second output terminal sig- of power amplifier 10；The first end and power amplification of 3rd resistor R3
First output end sig- of device 10 is electrically connected, and the second end of 3rd resistor R3 passes through switching switch module 30 and power amplifier 10
Second output terminal sig- electrical connection.
In the present embodiment, switching switch module 30 switches the load resistance of load blocks 20, so that first resistor R1, second
Resistance R2 and 3rd resistor R3 series connection and/or in parallel, cause load blocks 20 first resistor R1, second resistance R2 and
3rd resistor R3 can be combined into the resistance value of different loads resistance, to test power amplifier 10.
In the concrete realization, when the impedance of the load of power amplifier 10 electricity of the resistance value r1 equal to first resistor R1 and second
When hindering the sum of the resistance value r2 of R2, switching switch module 30 switches the load resistance of load blocks 20, so that first resistor R1 and the
Two resistance R2 are accessed in the form of concatenated in power amplifier test circuit 100, and 3rd resistor R3 does not access power amplifier test circuit 100.
At this point, the resistance value R11 of the load resistance of load blocks 20 are as follows:
R11=r1+r2
When the impedance of the load of power amplifier 10 be equal to first resistor R1 it is in parallel with 3rd resistor R3 when resistance value when, cut
The load resistance that switch module 30 switches load blocks 20 is changed, so that first resistor R1 connects with 3rd resistor R3 in form in parallel
Enter in power amplifier test circuit 100, and second resistance R2 does not access power amplifier test circuit 100.At this point, the load electricity of load blocks 20
The resistance value R12 of resistance are as follows:
Wherein, r3 is the resistance value of 3rd resistor R3.
When the impedance of the load of power amplifier 10 is equal in first resistor R1, second resistance R2 and 3rd resistor R3
When the resistance value of any one resistance, switching switch module 30 switches the load resistance of load blocks 20, so that first resistor R1, second
In resistance R2 or 3rd resistor R3 access power amplifier test circuit 100, and other resistance do not access power amplifier test circuit 100.This
When, the resistance value R13 of the load resistance of load blocks 20 are as follows:
R13=r1；Alternatively,
R13=r2；Alternatively,
R13=r3.
It should be noted that under the premise of meeting the load impedance of power amplifier 10, first resistor R1, second resistance
The combination of R2 and 3rd resistor R3 are not limited to above-mentioned form, can also be that 3rd resistor R3 such as connects at the shapes with second resistance R2
Formula, it is not limited here.
In the utility model an optional embodiment, with continued reference to Fig. 2, in the load resistance for meeting power amplifier 10
Under the premise of anti-, to be further simplified circuit structure, testing efficiency is improved, optionally, the resistance value r1 of first resistor R1, the second electricity
The resistance value r3 for hindering the resistance value r2 and 3rd resistor R3 of R2 is equal, i.e., as in following formula:
R=r1=r2=r3
Wherein, the resistance value r3 of the resistance value r1 of first resistor R1, the resistance value r2 of second resistance R2 and 3rd resistor R3 is for example
4 Ω are chosen as, to adapt to the load impedance of current power amplifier 10.
In the utility model an optional embodiment, optionally, as shown in figure 3, switching switch module 30 includes: the
One switch K1 and second switch K2.Wherein, first resistor R1 passes through first switch K1 and second switch K2 and power amplifier 10
Second output terminal electrical connection；The second end of second resistance R2 passes through the second output terminal of second switch K2 and power amplifier 10
Sig- electrical connection；The second end of 3rd resistor R3 is electrically connected by second switch K2 and the second output terminal sig+ of power amplifier 10
It connects；First switch K1 is in parallel with 3rd resistor R3 for controlling first resistor R1；Second switch K2 is for controlling second resistance
R2 and 3rd resistor R3 is electrically connected with the second output terminal sig-'s of power amplifier 10.Thereby, it is possible to pass through switching switching molding
The first switch K1 and second switch K2 of block 30 realize the switching of the different resistance value load resistances of load blocks 20.
In the utility model an optional embodiment, optionally, with continued reference to Fig. 3, first switch K1 includes: first
Hold m and second end n；Second switch K2 includes: first contact point A, the second contact point B and third contact point C；First switch K1's
The second end of first end m connection first resistor R1 and the first end of second resistance R2, the second end n connection third of first switch K1
The second end of resistance R3 and the second contact point B of second switch K2；The first contact point A connection second resistance R2 of second switch K2
Second end, and, the second output terminal of the third contact point C connection power amplifier 10 of second switch K2.
In a specific embodiment, as shown in figure 3, first switch K1 is single-pole single-throw switch (SPST)；Second switch K2 is
Single-pole double-throw switch (SPDT).
In the concrete realization, the resistance value phase of the resistance value of first resistor R1, the resistance value of second resistance R2 and 3rd resistor R3
Deng resistance value size is indicated with R.When switching switch module 30 first switch K1 disconnect, the third contact point C of second switch K2 with
When first contact point A connection, first resistor R1 and second resistance R2 are connected in series to first in power amplifier 10
Output end sig+ and second output terminal sig-, as shown in Fig. 4 thick lines.At this point, the resistance value of the load resistance of load blocks 20 is
R21:
R21=r1+r2=2R
Wherein, r1 is the resistance value of first resistor R1, and r2 is the resistance value of second resistance R2.If the electricity of power amplifier output
Pressure is U, then the output power P21 of power amplifier 10 are as follows:
When the first switch K1 disconnection of switching switch module 30, the third contact point C of second switch K2 and the second contact point B
When connection, only 3rd resistor R3 is connected to the first output end sig+ and second output terminal sig- of power amplifier 10, as Fig. 5 is thick
Shown in lines.At this point, the resistance value of the load resistance of load blocks 20 is R22:
R22=r3=R
Wherein, r3 is the resistance value of 3rd resistor R3.If the voltage of power amplifier output is U, power amplifier 10
Output power P22 are as follows:
As the first switch K1 closure of switching switch module 30, the third contact point C and first contact point A of second switch K2
When connection, first resistor R1 is in parallel with 3rd resistor R3, then the of power amplifier 10 is connected to after connecting with second resistance R2
One output end sig+ and second output terminal sig-, as shown in Fig. 6 thick lines.At this point, the resistance value of the load resistance of load blocks 20
For R23:
If the voltage of power amplifier output is U, the output power P23 of power amplifier 10 are as follows:
When the first switch K1 closure of switching switch module 30, the third contact point C of second switch K2 and the second contact point B
When connection, first resistor R1 and 3rd resistor R3 is connected in parallel in the output of the first output end sig+ and second of power amplifier 10
Sig- is held, as shown in Fig. 7 thick lines.At this point, the resistance value of the load resistance of load blocks 20 is R24:
If the voltage of power amplifier output is U, the output power P24 of power amplifier 10 are as follows:
Load blocks 20 can realize that the resistance value of 4 load resistances switches by 3 identical or different resistance as a result,
To reduce the volume of power amplifier test circuit, simplifies circuit structure and test mode, improve testing efficiency.
In a specific embodiment, optionally, as shown in figure 8, first switch K1 is single-pole single-throw switch (SPST)；Second opens
Closing K2 can also be relay.Its technical principle is similar with above content, and details are not described herein.
On the basis of the above embodiments, optionally, as shown in figure 9, power amplifier tests circuit 100 further include: prime amplification
Module 40.The input terminal Vi40 of prime amplification module 40 is electrically connected with audio input end In, and the first of prime amplification module 40 is defeated
Outlet Vo41 is electrically connected with the first input end Vi11 of power amplifier 10, the second output terminal Vo4 of prime amplification module 40 with
Second input terminal Vi12 of power amplifier 10 is electrically connected；Prime amplification module 40 is used for the audio for inputting audio input end In
Signal is converted to electric signal, and is input to power amplifier 10 after carrying out prime amplification.
In the present embodiment, since audio input end In input is lesser audio voltage signal, usually audio file
Signal after broadcasting, voltage magnitude and power are very small, need to be by prime amplification module 40 to the amplitude of audio voltage signal
It amplifies, so that amplified audio voltage signal meets the needs of power amplifier input.Wherein, prime amplification module
40 are chosen as voltage amplifier circuit.
On the basis of the above embodiments, optionally, as shown in Figure 10, power amplifier tests circuit 100 further include: test module
50.The first input end Vi51 of test module 50 is electrically connected with the first output end sig+ of power amplifier 10, test module 50
The second input terminal Vi52 be electrically connected with the second output terminal sig- of power amplifier 10；Test module 50 is put for measured power
The electric signal that big device 10 exports.
In the concrete realization, test module 50 passes through the output of the first output end sig+ of measured power amplifier 10 and second
The electric signal difference between sig- is held, and the defeated first output end sig+ of power amplifier 10 and the are obtained according to the electric signal difference
Pressure difference between two output end sig-, the as output voltage of power amplifier 10.Using the resulting power amplifier 10 of test
Output voltage and the corresponding load resistance of load blocks 20 resistance value, calculate the output power of power amplifier 10, from
And the performance of power amplifier 10 can be judged according to the size of the output power.
In a specific embodiment, 0 is continued to refer to figure 1, optionally, test module 50 includes: multimeter.The general-purpose
First output end sig+ of the first input end connection power amplifier 10 of table, the second input terminal of multimeter connect power amplification
The second output terminal sig- of device 10.
In the concrete realization, since multimeter can be directly used for measurement voltage, electric current and resistance etc..The ten thousand of test module 50
The output voltage of power amplifier 10 can be directly measured with table, while being possible to verify that 10 first output end of power amplifier
The resistance value of the load resistance accessed between sig+ and second output terminal sig-.Thereby, it is possible to the outputs using power amplifier 10
The resistance value of the load resistance accessed between voltage and power amplifier 10 first output end sig+ and second output terminal sig-,
The output power of power amplifier 10 is calculated, the property of power amplifier 10 is judged so as to the size according to the output power
Energy.
In a specific embodiment, 0 is continued to refer to figure 1, optionally, test module 50 includes: oscillograph.Oscillograph
First input end connection power amplifier 10 the first output end sig+, the second input terminal of oscillograph connects power amplifier
10 second output terminal sig-.
In the concrete realization, oscillograph can observe wavy curve that various unlike signal amplitudes change over time and right
The electric signals such as voltage, electric current, frequency, phase difference, modulation are tested.Therefore, the oscillograph of test module 50 can be direct
The output voltage for measuring power amplifier 10 calculates power and puts in conjunction with the resistance value of the corresponding load resistance of load blocks 20
The output power of big device 10, the performance of power amplifier 10 is judged so as to the size according to the output power.
Referring to Fig.1 1, show the structural block diagram of one of the utility model embodiment power amplifier test equipment.The power amplifier
Test equipment 200 may include: the test circuit 100 of power amplifier described in above-described embodiment.
Power amplifier test equipment 200 may include the test circuit 100 of power amplifier provided by the utility model any embodiment, have
The power amplifier test corresponding functional module of circuit 100 and beneficial effect provided by the utility model.
It should be noted that for 200 embodiment of power amplifier test equipment, since it is real with power amplifier test circuit 100
It is substantially similar to apply example, so being described relatively simple, related place is referring to the part explanation of power amplifier test 100 embodiment of circuit
It can.
It is worth noting that, in above-mentioned power amplifier test circuit 100, included modules only according to function logic into
What row divided, but be not limited to the above division, as long as corresponding functions can be realized；In addition, each functional unit
Specific name is also only for convenience of distinguishing each other, the protection scope being not intended to limit the utility model.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (12)
1. a kind of power amplifier tests circuit characterized by comprising power amplifier, load blocks and switching switch module；
Wherein, the first end of the load blocks is electrically connected with the first output end of the power amplifier, the load blocks
Second end be electrically connected by the switching switch module with the second output terminal of the power amplifier；
The switching switch module is used to switch the load resistance of the load blocks, to examine to the power amplifier
It surveys.
2. power amplifier according to claim 1 tests circuit, which is characterized in that the load blocks include: first resistor, the
Two resistance and 3rd resistor；
The first end of the first resistor is electrically connected with the first output end of the power amplifier, and the second of the first resistor
End is electrically connected by the switching switch module with the second output terminal of the power amplifier；
The first end of the second resistance is electrically connected with the second end of the first resistor, and the second end of the second resistance passes through
The switching switch module is electrically connected with the second output terminal of the power amplifier；
The first end of the 3rd resistor is electrically connected with the first output end of the power amplifier, and the second of the 3rd resistor
End is electrically connected by the switching switch module with the second output terminal of the power amplifier.
3. power amplifier according to claim 2 tests circuit, which is characterized in that the resistance value of the first resistor, described second
The resistance value of the resistance value of resistance and the 3rd resistor is equal.
4. power amplifier according to claim 2 tests circuit, which is characterized in that the switching switch module includes: first to open
Pass and second switch；
The first resistor is electrically connected by the first switch and the second switch with the second output terminal of the power amplifier；
The second end of the second resistance is electrically connected by the second switch with the second output terminal of the power amplifier；Described
The second end of three resistance is electrically connected by the second switch with the second output terminal of the power amplifier；
The first switch is in parallel with the 3rd resistor for controlling the first resistor；
The second switch is used to control the second output of the second resistance and the 3rd resistor and the power amplifier
The electrical connection at end.
5. power amplifier according to claim 4 tests circuit, which is characterized in that the first switch includes: first end and the
Two ends；The second switch includes: first contact point, the second contact point and third contact point；
The first end of the first switch connects the second end of the first resistor and the first end of the second resistance, and described
The second end of one switch connects the second end of the 3rd resistor and the second contact point of the second switch；
The first contact point of the second switch connects the second end of the second resistance, and, the third of the second switch
Contact point connects the second output terminal of the power amplifier.
6. power amplifier according to claim 4 tests circuit, which is characterized in that the first switch is single-pole single-throw switch (SPST)；
The second switch is single-pole double-throw switch (SPDT).
7. power amplifier according to claim 4 tests circuit, which is characterized in that the first switch is single-pole single-throw switch (SPST)；
The second switch is relay.
8. power amplifier according to claim 1 tests circuit, which is characterized in that further include: prime amplification module；
The input terminal of the prime amplification module is electrically connected with audio input end, the first output end of the prime amplification module with
The first input end of the power amplifier is electrically connected, the second output terminal of the prime amplification module and the power amplifier
The second input terminal electrical connection；
The prime amplification module is used to the audio signal that the audio input end inputs being converted to electric signal, and carries out prime
The power amplifier is input to after amplification.
9. power amplifier according to claim 1 tests circuit, which is characterized in that further include: test module；
The first input end of the test module is electrically connected with the first output end of the power amplifier, the test module
Second input terminal is electrically connected with the second output terminal of the power amplifier；The test module is for testing the power amplification
The electric signal of device output.
10. power amplifier according to claim 9 tests circuit, which is characterized in that the test module includes: multimeter；
The first input end of the multimeter connects the first output end of the power amplifier, the second input of the multimeter
End connects the second output terminal of the power amplifier.
11. power amplifier according to claim 9 tests circuit, which is characterized in that the test module includes: oscillograph；
The first input end of the oscillograph connects the first output end of the power amplifier, the second input of the oscillograph
End connects the second output terminal of the power amplifier.
12. a kind of power amplifier test equipment, which is characterized in that test circuit including the described in any item power amplifiers of claim 1~11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216700.2U CN209250889U (en) | 2019-02-20 | 2019-02-20 | Power amplifier test circuit and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216700.2U CN209250889U (en) | 2019-02-20 | 2019-02-20 | Power amplifier test circuit and equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209250889U true CN209250889U (en) | 2019-08-13 |
Family
ID=67537253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920216700.2U Active CN209250889U (en) | 2019-02-20 | 2019-02-20 | Power amplifier test circuit and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209250889U (en) |
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2019
- 2019-02-20 CN CN201920216700.2U patent/CN209250889U/en active Active
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