CN220858407U - Power amplifier equipment - Google Patents
Power amplifier equipment Download PDFInfo
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- CN220858407U CN220858407U CN202321495847.2U CN202321495847U CN220858407U CN 220858407 U CN220858407 U CN 220858407U CN 202321495847 U CN202321495847 U CN 202321495847U CN 220858407 U CN220858407 U CN 220858407U
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 11
- 230000005855 radiation Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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Abstract
The utility model provides a power amplifier circuit, comprising: the temperature sensor comprises a power amplifier circuit, a temperature collector, a follower, a control module and a feedback control circuit; the input end of the power amplification circuit is connected with a signal source, and the output end of the power amplification circuit is connected with the playing device; the temperature collector collects temperature signals of the power amplifier circuit, the positive end of the follower is connected with the temperature collector, and the output end of the follower is connected with the control module and is used for transmitting the temperature signals to the control module; the control module sends a control signal to the feedback control circuit according to the temperature signal; the feedback control circuit controls a signal source input to the power amplifier circuit according to the control signal. According to the utility model, the current temperature state of the power amplifier circuit is accurately obtained through the temperature collector and the follower, the feedback control circuit adjusts the signal source state input into the power amplifier circuit according to the control signal, and finally, the adjustment of the power amplifier circuit is realized, and the safe and stable operation of the power amplifier equipment is accurately ensured.
Description
Technical Field
The utility model relates to the field of sound amplifying equipment, in particular to power amplifying equipment.
Background
The power amplifier device can amplify the signal source and then play the signal source through the playing device, the power amplifier device can generate heating phenomena in the continuous use process, especially in some professional audio amplifying scenes such as singing, meeting, broadcasting and the like, the power amplifier device used by the power amplifier device is high in power and large in quantity, heat is rapidly accumulated, and if the heat cannot be well radiated due to environmental factors in the use process, the damage of the power amplifier device can be caused.
In this regard, the utility model provides a power amplifier device which can stably and safely operate.
Disclosure of utility model
The utility model provides power amplifier equipment which is used for solving the defect that the power amplifier equipment in the prior art is easy to accumulate heat and damage.
The utility model provides a power amplifier device, comprising: the temperature sensor comprises a power amplifier circuit, a temperature collector, a follower, a control module and a feedback control circuit;
The input end of the power amplification circuit is connected with a signal source, and the output end of the power amplification circuit is connected with a playing device;
The temperature collector collects temperature signals of the power amplifier circuit; the positive end of the follower is connected with the temperature collector, and the output end of the follower is connected with the control module and is used for transmitting the temperature signal to the control module;
The control module sends a control signal to the feedback control circuit according to the temperature signal;
and the feedback control circuit controls the signal source input into the power amplifier circuit according to the control signal.
According to the power amplifier equipment provided by the utility model, the feedback control circuit comprises a controlled resistor, wherein the first end of the controlled resistor is connected with the input end of the power amplifier circuit, and the second end of the controlled resistor is grounded; and the feedback control circuit controls the resistance value of the controlled resistor according to the control signal.
According to the power amplifier device provided by the utility model, the control module is configured to;
Transmitting a first level signal to the feedback control circuit under the condition that the temperature signal is larger than a set threshold value, so that the feedback control circuit controls the controlled resistor to be in a low-resistance state;
And under the condition that the temperature signal is smaller than or equal to the set threshold value, sending a second level signal to the feedback control circuit so that the feedback control circuit controls the controlled resistor to be in a high-resistance state.
According to the power amplifier device provided by the utility model, the feedback control circuit comprises a switching transistor, a light emitting diode and the controlled resistor;
The control end of the switching transistor is connected with the control module and is used for receiving a control signal of the control module; the two controlled ends of the switching transistor and the light emitting diode are connected in series on a first power supply branch;
the controlled resistor is a photoresistor and is used for receiving the light rays of the light-emitting diode.
According to the power amplifier device provided by the utility model, the side, close to the positive electrode of the power supply, of the first power supply branch is also connected with a second resistor in series.
According to the power amplifier equipment provided by the utility model, the equipment further comprises a heat radiation body for radiating the power amplifier circuit; the temperature collector comprises a thermistor and is used for collecting temperature signals of the heat radiation body.
According to the power amplifier equipment provided by the utility model, the temperature collector comprises a thermistor and a third resistor;
the thermistor and the third circuit are connected in series on a second power supply branch; and a detection point between the thermistor and the third resistor is connected with the positive end of the follower.
According to the power amplifier equipment provided by the utility model, the control module determines the temperature of the power amplifier circuit according to the following formula:
Vt＝VcRc/(Rc+Rt)；
Wherein V t is the voltage at the detection point, V c is the supply voltage of the second power supply branch, R c is the third resistor, R t is a function of the temperature of the thermistor, R t.
According to the power amplifier device provided by the utility model, the power amplifier device further comprises a first resistor, wherein the first end of the first resistor is connected with the signal source, and the second end of the first resistor is connected with the input end of the power amplifier circuit and the first end of the controlled resistor.
The power amplifier device provided by the utility model further comprises a display module, wherein the display module is connected with the control module and is used for displaying the temperature of the power amplifier circuit.
According to the utility model, the current temperature state of the power amplifier circuit is accurately obtained through the temperature collector and the follower, the interference of the control module on the temperature signal is avoided through the follower, the accuracy of temperature collection is improved, the control module outputs a control signal according to the temperature signal and a control strategy, and the feedback control circuit adjusts the state of a signal source input into the power amplifier circuit according to the control signal, so that the adjustment of the power amplifier circuit is finally realized, and the safe and stable operation of the power amplifier equipment is accurately ensured.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a power amplifier device provided by the present utility model;
Fig. 2 is a circuit diagram example of a power amplifier device provided by the present utility model;
Fig. 3 is a table illustrating a correspondence between a thermistor and temperature in the power amplifier device according to the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
A power amplifier device according to the present utility model is described below with reference to fig. 1 to 3.
Fig. 1 is a schematic structural diagram of a power amplifier device provided by the present utility model, where, as shown in fig. 1, the power amplifier device includes: the temperature sensor comprises a power amplifier circuit, a temperature collector, a follower, a control module and a feedback control circuit;
The input end of the power amplification circuit is connected with a signal source, and the output end of the power amplification circuit is connected with the playing device. The power amplification device can amplify the signal source to output an amplified signal, and the playing device converts the amplified signal into acoustic energy to realize sound amplification, and the playing device is such as a sound box, a handheld loudspeaker, a fixed loudspeaker and the like.
The temperature collector collects temperature signals of the power amplifier circuit and transmits the temperature signals to the control module. The temperature collector generates an electric signal (namely the object concentration signal) according to the temperature state of the power amplifier circuit, the temperature collector comprises a signal detection point, the detection point is connected with the positive end of the follower, the output end of the follower is connected with a temperature signal pin of the control module, and the temperature signal is transmitted to the control module. It can be understood that the output end of the follower can output the same voltage as the positive end, and the temperature collector cannot be interfered, so that the accuracy of temperature collection is improved.
The control module comprises a temperature signal pin and a control signal pin, wherein the temperature signal pin is connected with the follower and used for receiving a temperature signal, and the control signal pin is connected with the feedback control circuit and used for outputting a control signal to the feedback control circuit. The control module can generate a corresponding control signal according to the temperature signal, specifically, a program is burnt in the control module, and the control module processes the temperature signal according to the program to generate the control signal.
The feedback control circuit adjusts the signal source input into the power amplification circuit according to the control signal, for example, when the temperature is too high, the signal source input into the power amplification circuit is cut off according to the received first level signal, and when the temperature is normal, the signal source input into the power amplification circuit is recovered according to the received second level signal.
In the embodiment, the temperature signal of the power amplifier circuit is collected through the temperature collector so as to be convenient for knowing the current temperature state of the power amplifier circuit, the temperature signal is prevented from being interfered by the control module through the follower, the accuracy of temperature collection is improved, the control module outputs a control signal according to the temperature signal and a control strategy, the feedback control circuit adjusts the state of a signal source input into the power amplifier circuit according to the control signal, and finally, the power amplifier circuit is adjusted, so that the safe and stable operation of the power amplifier equipment is accurately ensured.
Based on the above embodiments, in one embodiment, the feedback control circuit includes a controlled resistor, and the feedback control circuit controls the resistance value of the controlled resistor according to the control signal. The first end of the controlled resistor is connected with the input end of the power amplifier circuit, and the second end of the controlled resistor is grounded (power supply cathode and reference ground). It can be understood that, since the first end of the controlled resistor is connected to the input end of the power amplifier circuit, and the input end of the power amplifier circuit is also connected to the signal source, the controlled resistor can shunt the signal source. When the controlled resistor is in a high-resistance state, the shunt effect is weaker, the signal source input into the power amplifier circuit is basically not influenced, and the power amplifier circuit can work normally at the moment; when the controlled resistance is in a low resistance state, the signal source basically passes through the controlled resistance, namely, a short circuit effect is achieved on the power amplifier circuit, the power of the power amplifier circuit is reduced, and heat accumulation is reduced.
In the embodiment, the temperature control switch is not used for controlling the signal source input of the power amplification circuit, and because the temperature control switch has large error and the metal sheet of the temperature control switch is easy to break down when the trip machinery is in strain, the service life is not long, and the power amplification equipment can control the working state of the power amplification equipment more accurately and stably. In this embodiment, the switching transistor is not used to directly control the signal source input, and because the nonlinear voltage drop of the switching transistor can interfere the signal source when the switching transistor is used to directly control the signal source input, the utility model can better protect the tone quality of the played sound.
Based on the above embodiments, in one embodiment, the control module is configured to;
under the condition that the temperature signal is larger than a set threshold value, a first level signal is sent to the feedback control circuit, so that the feedback control circuit controls the controlled resistor to be in a low-resistance state;
And under the condition that the temperature signal is smaller than or equal to the set threshold value, sending a second level signal to the feedback control circuit so that the feedback control circuit controls the controlled resistor to be in a high-resistance state.
Specifically, the above configuration content may be implemented by a program burned into the control module. The set threshold can be flexibly set and adjusted according to the requirements, so that the signal source is cut off when the temperature exceeds a certain temperature, the power of the power amplifier circuit is reduced, the signal source is introduced when the temperature is lower than a certain temperature, and the power of the power amplifier equipment is improved. The first level signal and the second level signal are different level signals, for example, the first level signal is high level, the second level signal is low level, for example, the first level signal is low level, and the second level signal is high level.
Further, the feedback control circuit also comprises a D/A conversion module, and the D/A conversion module converts the control signal output by the control module into an analog control signal to adjust the power of the power amplifier circuit. For example, the switching transistor Q1 in fig. 2 is replaced by a D/a conversion module, and the power of the light emitting diode is adjusted by the D/a conversion module, so that the resistance value of the controlled resistor is adjusted, the shunting effect on the signal source is realized, and the power of the power amplifier circuit can be smoothly adjusted.
Referring to fig. 2, in one embodiment, the feedback control circuit includes a switching transistor Q 1, a light emitting diode, and a controlled resistor;
The control end of the switching transistor Q 1 is connected with the control module and is used for receiving a control signal of the control module; the two controlled ends of the switching transistor and the light emitting diode are connected in series on the first power branch; the controlled resistor is a photoresistor and is used for receiving light rays of the light-emitting diode.
Specifically, fig. 2 illustrates only one possible scheme: the switching transistor Q1 adopts an NPN triode, the emitter of the triode is connected with GND (grounding, power supply cathode), the base electrode of the triode is connected with the control module, the collector electrode of the triode is connected with the cathode of the light-emitting diode, and the anode of the light-emitting diode is connected with the anode Vs of the first power supply. When the base electrode of the triode receives the high-level signal, the triode is conducted, and the light emitting diode emits electricity, so that the controlled resistor is in a low-resistance state; when the base electrode of the triode receives the low-level signal, the triode is cut off, and the light emitting diode is powered off, so that the controlled resistor is in a high-resistance state.
It will be appreciated that based on the same concept, other types of switching transistors (thyristors, field effect transistors) may be used and the first power supply branch may be adjusted accordingly, for example, a PNP transistor, an emitter of the transistor being connected to the power supply positive electrode Vs, a base of the transistor being connected to the control module, a collector of the transistor being connected to the positive electrode of the light emitting diode, and a negative electrode GND (ground, power supply negative electrode) of the light emitting diode. When the base electrode of the triode receives the high-level signal, the triode is cut off, and the light emitting diode is powered off, so that the controlled resistor is in a high-resistance state; when the base electrode of the triode receives the low-level signal, the triode is conducted, and the light-emitting diode emits electricity, so that the controlled resistor is in a low-resistance state.
The light-emitting diode and the controlled resistor form a photoelectric coupler (LCR photoelectric coupler is shown in fig. 2), electromagnetic interference can be prevented by the circuit, the control process of the power amplification equipment is quick in response speed, high in stability and long in service life, the quality of a signal source input into the power amplification circuit is not influenced, and sound quality is prevented from being polluted.
Still referring to fig. 2, in one embodiment, a second resistor R2 is further connected in series to a side of the first power branch near the positive electrode of the power supply, where the second resistor R2 is used to protect the first switching transistor and the light emitting diode from overload damage.
Based on any one of the above embodiments, in one embodiment, the device further includes a heat radiator for radiating heat for the power amplifier circuit, where a shape and a position of the heat radiator can be flexibly set according to requirements; the temperature collector comprises a thermistor and is used for collecting temperature signals of the heat radiation body.
Based on any of the above embodiments, in one embodiment, the temperature collector includes a thermistor and a third resistor. The thermistor and the third circuit are connected in series with the second power branch, and it is understood that the "second power branch" is used herein to distinguish from the aforementioned "first power branch", and the power supply voltage of the second power branch may be different from the power supply voltage of the first power branch or the same as the power supply voltage of the first power branch. A detection point (i.e. a signal detection point in the foregoing embodiment) is provided on the connection line between the thermistor and the third resistor, and is connected to the positive end of the follower, and a temperature signal is input to the control module through the follower.
In the embodiment, the thermistor and the third circuit are connected in series on the second power branch, and the temperature measurement is performed by detecting the partial pressure signal, so that the power consumption of the temperature collector can be reduced, and the accuracy of the temperature measurement is improved.
Still referring to fig. 2, in one embodiment, the temperature collector further includes a follower U1, the aforementioned detection point is connected to a positive terminal of the follower U1 (i.e., pin No. 3 of U1 in fig. 2), an output terminal of the follower U1 (i.e., pin No. 1 of U1 in fig. 2) is connected to a temperature signal pin of the control module, and an output terminal of the follower U1 is also connected to a negative terminal of the follower (i.e., pin No. 2 of U1 in fig. 2).
In the embodiment, the follower plays an isolating role on the second power supply branch and the control module, so that the control module cannot interfere with the voltage signal of the detection point, and the accuracy of detecting the temperature signal is improved.
Still referring to FIG. 2, in one embodiment, the control module determines the temperature of the power amplifier circuit according to the following formula:
Vt＝VcRc/(Rc+Rt)；
Wherein V t is the voltage at the detection point, V c is the supply voltage of the second power supply branch, R c is the third resistor, R t is the thermistor, and R t is a function of temperature.
Specifically, the third resistor R c and the thermistor R t play a role in dividing the supply voltage of the second power supply branch, and the above formula can be obtained according to the dividing relationship. In addition, the resistance of the thermistor R t is a function of temperature, for example, fig. 3 illustrates a table of the correspondence between the resistance of the thermistor and the temperature. According to the formula and the corresponding relation between the resistance value of the thermistor R t and the temperature, the corresponding relation between V t and the temperature can be determined, and then the temperature of the power amplifier circuit can be determined according to the actually measured V t in the temperature measuring process.
Still referring to fig. 2, in one embodiment, the power amplifying device further includes a first resistor R 1, a first end of the first resistor R 1 is connected to the signal source, and a second end of the first resistor R 1 is connected to the input end of the power amplifying circuit and the first end of the controlled resistor. Specifically, the first resistor R 1 can play a role in current limiting, and prevent the power amplifier equipment from being damaged by current overload.
Based on any one of the above embodiments, in one embodiment, the power amplification device further includes a display module, where the display module is connected to the control module and is configured to display a temperature of the power amplification circuit, so that a user knows a current temperature state of the power amplification device and reasonably uses the power amplification device. A display module such as a nixie tube, a display screen such as that of fig. 2, and the like.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (8)
1. A power amplifier apparatus, comprising: the temperature sensor comprises a power amplifier circuit, a temperature collector, a follower, a control module and a feedback control circuit;
The input end of the power amplification circuit is connected with a signal source, and the output end of the power amplification circuit is connected with a playing device;
The temperature collector collects temperature signals of the power amplifier circuit; the positive end of the follower is connected with the temperature collector, and the output end of the follower is connected with the control module and is used for transmitting the temperature signal to the control module;
The control module sends a control signal to the feedback control circuit according to the temperature signal;
the feedback control circuit controls the signal source input into the power amplifier circuit according to the control signal;
The feedback control circuit comprises a controlled resistor, a first end of the controlled resistor is connected with the input end of the power amplifier circuit, and a second end of the controlled resistor is grounded; the feedback control circuit controls the resistance value of the controlled resistor according to the control signal;
the control module is configured to;
Transmitting a first level signal to the feedback control circuit under the condition that the temperature signal is larger than a set threshold value, so that the feedback control circuit controls the controlled resistor to be in a low-resistance state;
And under the condition that the temperature signal is smaller than or equal to the set threshold value, sending a second level signal to the feedback control circuit so that the feedback control circuit controls the controlled resistor to be in a high-resistance state.
2. The power amplifier device of claim 1, wherein the feedback control circuit comprises a switching transistor, a light emitting diode, and the controlled resistor;
The control end of the switching transistor is connected with the control module and is used for receiving a control signal of the control module; the two controlled ends of the switching transistor and the light emitting diode are connected in series on a first power supply branch;
the controlled resistor is a photoresistor and is used for receiving the light rays of the light-emitting diode.
3. The power amplifier device of claim 2, wherein a second resistor is further connected in series to a side of the first power branch near the positive electrode of the power supply.
4. The power amplifier device of claim 1, further comprising a heat sink for dissipating heat from the power amplifier circuit; the temperature collector comprises a thermistor and is used for collecting temperature signals of the heat radiation body.
5. The power amplifier apparatus of claim 1, wherein the temperature collector comprises a thermistor and a third resistor;
The thermistor and the third resistor are connected in series on a second power supply branch; and a detection point between the thermistor and the third resistor is connected with the positive end of the follower.
6. The power amplifier apparatus of claim 5, wherein the control module determines the temperature of the power amplifier circuit according to the formula:
Vt＝VcRc/(Rc+Rt)；
Wherein V t is the voltage at the detection point, V c is the supply voltage of the second power supply branch, R c is the third resistor, R t is a function of the temperature of the thermistor, R t.
7. The power amplifier device of claim 1, further comprising a first resistor, a first end of the first resistor terminating the signal source, a second end of the first resistor connecting the input of the power amplifier circuit and the first end of the controlled resistor.
8. The power amplifier device of claim 1, further comprising a display module connected to the control module for displaying a temperature of the power amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321495847.2U CN220858407U (en) | 2023-06-13 | 2023-06-13 | Power amplifier equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321495847.2U CN220858407U (en) | 2023-06-13 | 2023-06-13 | Power amplifier equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220858407U true CN220858407U (en) | 2024-04-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321495847.2U Active CN220858407U (en) | 2023-06-13 | 2023-06-13 | Power amplifier equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220858407U (en) |
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2023
- 2023-06-13 CN CN202321495847.2U patent/CN220858407U/en active Active
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