CN110351630B - Power amplifier control system and method based on automatic level control - Google Patents
Power amplifier control system and method based on automatic level control Download PDFInfo
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Abstract
The invention discloses a power amplifier control system and method based on automatic level control, mainly comprising a controllable attenuation circuit and the like, wherein the first input end of the controllable attenuation circuit is connected with a signal input, the second input end of the controllable attenuation circuit is connected with an output control signal Vp of a differential integration circuit, the output end of the controllable attenuation circuit is connected with the input end of a signal transmission circuit, the output end of the signal transmission circuit is connected with the input end of a final-stage power amplifier tube, and the output end of the final-stage power amplifier tube is used for outputting signals; the temperature detection circuit is used for detecting the temperature of the power amplifier. The invention can also increase a voltage control circuit to reduce the static power consumption of the power amplifier tube. The invention has the beneficial effects that: besides the method of reducing power, the method of reducing the static power consumption of the power amplifier tube is also adopted to reduce the power consumption, and finally the minimum output power and the power amplifier power consumption under the minimum static state of the invention are very small, so that the power amplifier can keep certain power output under the extreme high-temperature condition, and the system keeps partial communication function.
Description
Technical Field
The invention relates to the field of power amplifier systems, in particular to a power amplifier control system and method based on automatic level control.
Background
The power amplifier is widely applied to electronic products such as communication, household appliances and the like, and is mainly used for amplifying high power of signals, increasing the signal strength and improving the signal coverage range; along with market demands and technological progress, various electronic products are smaller in size, the heat dissipation environment of a power amplifier is more and more complex, and the phenomenon that the performance of the equipment is seriously reduced or even damaged due to overhigh temperature of the equipment is more and more caused.
The protection measures of the existing product for the power amplifier are generally that when the temperature of a power amplifier module is detected to be larger than a preset threshold temperature, the power amplifier is operated to reduce the power according to a preset proportion so as to reduce the power consumption, and therefore, the temperature of the power amplifier is reduced, and if the frequency of reducing the power by operating the power amplifier at present is larger than the preset frequency, the power amplifier is closed; for example, the application publication No. CN109348310A, the core measures of the scheme for protecting the temperature of the power amplifier are as follows: presetting a first over-temperature threshold value and a second over-temperature threshold value, when the power amplifier temperature is greater than the first over-temperature threshold value and less than the second over-temperature threshold value, obtaining the times of reducing the transmission power of the baseband, if the times of reducing the transmission power is less than a certain preset value, reducing the transmission power of the baseband according to a preset proportion, otherwise, closing the power amplifier power supply. This method has the following disadvantages:
1. the power reduction operation has step limitation, if the preset power reduction proportion is overlarge, the power amplifier temperature is far lower than the threshold temperature, but the power is overlarge, and the performance of the power amplifier is greatly wasted; if the preset power reduction proportion is too small, the power reduction is possibly too slow, and the power amplifier cannot be protected in time;
2. a proper time interval must be set in the power reduction operation, because a certain time process exists from the reduction of the power amplifier to the detection of the temperature reduction of the power amplifier, if the time interval is not set or is too short, the effect of the previous power reduction operation is not reflected, the next power reduction operation is carried out, so that the output power of the power amplifier is reduced quickly, and even the power amplifier is turned off; but once this time interval is set, the power amplifier must be operated above a threshold temperature;
3. the method for cooling is single, only the power reduction and the power consumption reduction are considered for cooling, in fact, when the output power of the power amplifier is reduced to a certain degree, the power consumption reduction value caused by the power reduction is very small, even if the power amplifier does not have the output power, the power amplifier still has very large power consumption due to the existence of the static working current of the power amplifier, and therefore, the power amplifier can only be completely closed when the power reduction operation frequency reaches the preset value;
4. for the purpose of protecting the power amplifier, if the temperature of the power amplifier exceeds the threshold temperature after the power reduction operation frequency exceeds the preset frequency, the operation of closing the power amplifier is generally adopted, and the power amplifier is generally not opened after being closed; this operation protects the power amplifier from damage, but also results in complete failure of the power amplifier function and complete interruption of communication.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a power amplifier control system and method based on automatic level control.
The purpose of the invention is achieved by the following technical scheme: a power amplifier control system based on automatic level control mainly comprises a controllable attenuation circuit, a signal transmission circuit, a final-stage power amplifier tube, a differential integration circuit and a temperature detection circuit, wherein a first input end of the controllable attenuation circuit is connected with a signal input, a second input end of the controllable attenuation circuit is connected with an output control signal Vp of the differential integration circuit, an output end of the controllable attenuation circuit is connected with an input end of the signal transmission circuit, an output end of the signal transmission circuit is connected with an input end of the final-stage power amplifier tube, and an output end of the final-stage power amplifier tube is used for outputting a signal; the temperature detection circuit is used for detecting the temperature of the power amplifier, the first input end of the differential integration circuit is connected with an output signal Vt1 of the temperature detection circuit, and the second input end of the differential integration circuit is connected with a temperature threshold reference value Vt 2; the differential integration circuit compares the input temperature detection value Vt1 with the temperature threshold reference value Vt2, and outputs a control signal Vp according to the comparison result to control the attenuation of the controllable attenuator.
Furthermore, the differential integration circuit mainly comprises a comparator, wherein the input end of the comparator is respectively connected with a temperature threshold reference value Vt2 and a temperature detection value Vt1 at the output end of the temperature detection circuit; when the temperature detection value Vt1 is smaller than the temperature threshold reference value Vt2 (Vt1 < Vt2), the comparator outputs the control signal Vp without increasing the attenuation of the controllable attenuation circuit, and the signal output power is unchanged; when the temperature detection value Vt1 is larger than or equal to the temperature threshold reference value Vt2 (Vt1 is larger than or equal to Vt2), the comparator outputs a control signal Vp jump, the attenuation of the controllable attenuation circuit is increased, the signal output power begins to be reduced, and finally the temperature detection value Vt1 is equal to the temperature threshold reference value Vt 2.
Furthermore, the jump of the output signal Vp of the differential integration circuit includes a voltage rise or a voltage drop, if the attenuation of the control voltage drop of the controllable attenuation circuit is increased, the control signal Vp jumps to a voltage drop, and otherwise, if the attenuation of the control voltage rise of the controllable attenuation circuit is increased, the control signal Vp jumps to a voltage rise.
Further, the controllable attenuation circuit includes a voltage controlled attenuator.
Further, the temperature detection circuit includes an analog temperature detection device or a thermistor.
As another technical solution, the present invention further includes a voltage control circuit, a first input end of the voltage control circuit is connected to the standard voltage Vg1, a second input end is connected to the output control signal Vp of the differential integrator circuit, and a power supply end of the final power amplifier tube is connected to the output signal Vg2 of the voltage control circuit; when the power amplifier temperature is smaller than the temperature threshold reference value Vt2, the control signal Vp is unchanged, the output signal Vg2 of the voltage control circuit is also unchanged, and the final-stage power amplifier tube works normally; when the power amplifier temperature is not less than the temperature threshold reference value, the control signal Vp jumps, the output signal Vg2 of the voltage control circuit is reduced according to the preset proportion, the quiescent current of the final-stage power amplifier tube is reduced, and the power consumption of the whole power amplifier is also reduced.
Furthermore, the voltage control circuit adopts a digital circuit and mainly comprises an ADC, a DAC and a singlechip, the differential integration circuit outputs a control signal Vp which is input into the ADC and then converted into a digital signal, the conversion among the signal Vp, the signal Vg1 and the voltage control circuit output signal Vg2 is completed in a digital domain, and finally the DAC outputs a signal Vg2 and controls the static change of the final-stage power amplifier tube.
Furthermore, the voltage control circuit adopts an analog circuit and mainly comprises an adder and a voltage division circuit, wherein the input end of the voltage division circuit is connected with an output control signal Vp, and the output end of the voltage division circuit is connected with a first input port of the adder; the second input port of the adder is connected with a standard voltage Vg 1; the output signal Vg2 of the adder is connected with the final power amplifier tube; when the power amplifier temperature is not less than the temperature threshold reference value, Vp jumps, the voltage drops, Vg2 passing through the voltage division circuit and the adder is reduced, and the static current of the final-stage power amplifier tube is reduced.
Furthermore, the voltage control circuit adopts an analog circuit and mainly comprises a subtracter and a voltage division circuit, wherein the input end of the voltage division circuit is connected with an output control signal Vp, and the output end of the voltage division circuit is connected with a first input port of the subtracter; the second input port of the subtracter is connected with a standard voltage Vg 1; the output signal Vg2 of the subtracter is connected with a final-stage power amplifier tube; when the power amplifier temperature is not less than the temperature threshold reference value, Vp jumps, the voltage rises, Vg2 passing through the voltage division circuit and the subtracter is reduced, and the static current of the final-stage power amplifier tube is reduced.
The invention also provides a power amplifier control method based on automatic level control, which comprises the following steps:
(101) acquiring the current temperature of the power amplifier;
(102) calculating the current value of the power amplifier input power control signal according to the reference temperature and the current temperature;
the reference temperature is a limit temperature reference value which can be born by a preset power amplifier, the current value of the power amplifier input power control signal is adaptively adjusted according to the initial value of the power amplifier input power control signal and the difference value between the reference temperature and the current temperature, when the power amplifier temperature is lower than the preset limit temperature, the power amplifier output power is ensured to be constant in normal output, and when the power amplifier temperature exceeds the preset limit temperature, the power amplifier power is reduced, so that the power amplifier temperature is reduced;
the calculation mode is that the current value is equal to the initial value + (reference temperature value-current temperature value) formula (1)
Or the current value is the initial value- (reference temperature value-current temperature value) formula (2)
(103) Adjusting the input power of the power amplifier by acquiring the current value of the power amplifier input power control signal, thereby adjusting the power consumption and the temperature of the power amplifier;
(105) and detecting the temperature of the power amplifier, and performing new calculation on the current value of the power amplifier input power control signal until the reference temperature value is equal to the current temperature value.
As a further preferable scheme, a step (104) is added between the steps (103) and (105): the static power consumption of the final power amplifier tube is adjusted, the change of the output power of the power amplifier is determined through the current value of the power amplifier input power control signal, and the static current or the power supply voltage of the power amplifier tube is controlled to effectively improve the power consumption of the power amplifier, so that the temperature of the power amplifier is improved.
Further, in step (102), the initial value is the current value of the previous time point or the previous temperature sampling point.
Furthermore, in step (102), the reference temperature value and the current temperature value are multiplied by the same coefficient, so that the difference between the reference temperature and the current temperature is matched with the initial value or the magnitude of the power amplifier input power control signal value.
Furthermore, in step (102), the calculation mode selects a control mode depending on the input power control signal of the power amplifier, and if the value of the input power control signal of the power amplifier is decreased, the input power of the power amplifier is decreased, then formula (1) is selected, and if the value of the input power control signal of the power amplifier is increased, the input power of the power amplifier is decreased, then formula (2) is selected.
Furthermore, the mode of controlling the static power consumption of the power amplifier adopts the control of the grid voltage of the power amplifier tube, and when the current value of the input power control signal of the power amplifier reduces the output power of the power amplifier, the grid voltage of the power amplifier tube is controlled to be reduced according to the preset proportion.
Furthermore, the mode of controlling the static power consumption of the power amplifier tube adopts the mode of controlling the power supply voltage of the power amplifier tube, and when the current value of the power amplifier input power control signal reduces the power amplifier output power, the drain voltage of the power amplifier tube is controlled to be reduced according to the preset proportion.
Furthermore, the mode of controlling the static power consumption of the power amplifier tube can adopt a mode of combining a control gate voltage and a drain voltage, and when the current value of the power amplifier input power control signal reduces the output power of the power amplifier, the control gate voltage and the drain voltage are reasonably adjusted, so that the static power consumption of the power amplifier tube is reduced.
Correspondingly, the invention also provides a computing device, comprising:
a memory for storing program instructions;
and the processor is used for calling the program instruction stored in the memory and executing the power amplifier control method according to the obtained program.
Correspondingly, the invention also provides a computer-readable nonvolatile storage medium, which comprises a computer-readable instruction, and when the computer reads and executes the computer-readable instruction, the computer is enabled to execute the power amplifier control method.
The invention has the beneficial effects that:
1. the invention utilizes the characteristics of the differential integral circuit and the control scheme of the closed loop, the power reduction does not need to be preset in proportion and has no step limitation, the differential integral circuit controls the attenuation of the attenuator and the quiescent current of the power amplifier, so that the power consumption and the temperature of the power amplifier are kept in a balanced state, the temperature detection value of the power amplifier is equal to the reference value of the temperature threshold, and the maximum power is output in the allowable temperature range;
2. the invention does not need to set the preset proportion of the power reduction, the operation interval time, the power reduction times and the like, the circuit delay is as small as millisecond level, and the output power and the quiescent current of the power amplifier are controlled to be reduced in the current state as long as the temperature detection value of the power amplifier is not less than the temperature threshold reference value.
3. The method reduces the power consumption by adopting a method for reducing the static power consumption of the power amplifier tube besides a method for reducing the power, considers the factors that the influence of the continuous power reduction on the power consumption reduction of the traditional scheme after the output power of the power amplifier is reduced to a certain degree and the high static power consumption of the power amplifier tube after the power reduction is unfavorable to the linearity of the power amplifier, creatively applies a mode of linkage of the output power and the static power consumption of the power amplifier, so that the power amplifier can adjust the static power consumption of the power amplifier through a preset proportion under a high-temperature condition so as to reduce the working power consumption of the power amplifier, and a power amplifier module can reduce more power consumption under the condition of the same output power or output more power under the condition of reducing the same power consumption;
4. the invention reduces the work power consumption of the power amplifier by reducing the static power consumption of the power amplifier tube, the power amplifier power consumption under the minimum output power and the minimum static state is very small, the temperature of the power amplifier is close to the state that the power amplifier is completely closed, and the power amplifier can be protected without adopting the measure of closing the power amplifier, thereby ensuring that the power amplifier keeps certain power output under the extreme high temperature condition and ensuring that the system keeps partial communication function.
Drawings
Fig. 1 is a block diagram schematically illustrating embodiment 1 of the present invention.
Fig. 2 is a block diagram of embodiment 2 of the present invention.
FIG. 3 is a schematic diagram of a differential integration circuit according to the present invention.
FIG. 4 is a schematic diagram of a voltage control circuit according to the present invention.
FIG. 5 is a block diagram of the method 1 of the present invention.
FIG. 6 is a block diagram of method 2 of the present invention.
Detailed Description
The invention will be described in detail below with reference to the following drawings:
example 1: as shown in fig. 1 and 3, a power amplifier control system based on automatic level control includes a controllable attenuation circuit U1, a signal transmission circuit U2, a final stage power amplifier U3, a temperature detection circuit U6, and a differential integration circuit U5, wherein a first input terminal of the controllable attenuation circuit U1 is connected to a signal input, and a second input terminal thereof is connected to an output signal Vp of the differential integration circuit U5; the output end is connected with the signal transmission circuit U2; the input end of the signal transmission circuit U2 is connected with a controllable attenuation circuit U1, and the output end is connected with a final-stage power amplification tube U3; the input end of the final-stage power amplifier tube U3 is connected with the output end of the signal transmission circuit U2, and the output end is used for signal output; the temperature detection circuit U6 detects the ambient temperature, and the output end of the temperature detection circuit U6 is connected with the differential integration circuit U5; the first input end of the differential integration circuit U5 is connected with the output signal Vt1 of the temperature detection circuit U6, the second input end is connected with the temperature threshold reference value Vt2, and the output end is connected with the second input end of the controllable attenuator.
In this embodiment, the controllable attenuation circuit U1 employs a voltage-controlled attenuator, and the temperature detection circuit U6 employs an analog temperature detection device, a thermistor, and the like. The differential integration circuit U5 includes a comparator Q1, a capacitor Q2 and a resistor Q3, as shown in fig. 3, wherein the input terminals of the comparator are respectively connected to a temperature detection value Vt1 and a temperature threshold reference value Vt 2; the comparator Q1 compares the temperature detection value Vt1 with the temperature threshold reference value Vt2, and when the temperature detection value Vt1 is smaller than the temperature threshold reference value Vt2, the comparator outputs the control signal Vp without increasing the attenuation of the controllable attenuation circuit U1, and the signal output power is unchanged; when the temperature detection value Vt1 is greater than or equal to the temperature threshold reference value Vt2, the comparator outputs a control signal Vp jump, the Q2 and the Q3 complete the function of an integrating circuit, the output voltage of the comparator can be integrated, the attenuation of the controllable attenuation circuit U1 is increased, and the signal output power begins to be reduced; when the temperature detection value Vt1 is greater than the temperature threshold reference value Vt2, the control signal output by the comparator maximizes the attenuation of the attenuation circuit U1. In fact, when the temperature of the power amplifier is not less than the temperature threshold reference value Vt2 and continues to increase, the differential integrator circuit U5 may continue to control the attenuation increase at the current attenuation of the controllable attenuator U1, and control the power consumption and the temperature decrease, which in turn may cause the differential integrator circuit U5 to control the attenuation of the controllable attenuator U1 to decrease, and due to the function of the output integrator circuit of the differential integrator circuit U5, this process may reach a balance in an extremely fast practical (millisecond level), that is, when the temperature detection value Vt1 of the power amplifier at the current attenuation is equal to the temperature threshold reference value Vt 2. The control signal Vp jumps to include a voltage rise or a voltage drop, and depends on the controlled manner of the controllable attenuation circuit U1, if the attenuation of the control voltage drop of the controllable attenuation circuit U1 increases, the control signal Vp jumps to a voltage drop, and otherwise, if the attenuation of the control voltage rise of the controllable attenuation circuit U1 increases, the control signal Vp jumps to a voltage rise.
The working principle of the embodiment is as follows: in this embodiment, the power of the input signal is controlled by the controllable attenuation circuit U1, the signal transmission circuit U2, the last-stage power amplifier tube U3, the temperature detection circuit U6 and the differential integration circuit U5, so as to reduce the output power of the last-stage power amplifier tube and reduce the power consumption of the last-stage power amplifier tube, thereby achieving the purpose of reducing the temperature of the power amplifier and protecting the power amplifier from operating in an over-temperature environment; the temperature detection circuit U6 detects the temperature of the power amplifier and converts the temperature into a first input signal of the differential integration circuit; the differential integration circuit U5 compares the temperature detection value Vt1 and the temperature threshold reference value Vt2, and outputs the control signal Vp to control the attenuation of the controllable attenuator U1 according to the two values. The controllable attenuation circuit U1 can receive the control signal Vp and adjust the attenuation according to the control signal Vp. Specifically, the method comprises the following steps: the temperature detection circuit U6 detects the temperature of the power amplifier and converts the temperature into a first input signal Vt1 of the differential integration circuit U5, the differential integration circuit U5 receives a temperature detection value Vt1 and a temperature threshold reference value Vt2 of a temperature detection chip and compares the two values to output a control signal Vp, when the temperature detection value Vt1 is small, namely the temperature of the power amplifier is low, the value of the control signal Vp is kept unchanged, at the moment, the attenuation of the controllable attenuator U1 is not changed, and the output power of the power amplifier is kept constant; when the temperature detection value Vt1 is not less than the temperature threshold reference value Vt2, namely the power amplifier temperature is equal to the threshold temperature, the control signal Vp value jumps, and the controllable attenuator U1 is controlled by Vp; if the temperature detection value Vt1 continues to rise, the controllable attenuator U1 is controlled by Vp to increase the attenuation, at this time, the output power of the final power amplifier tube becomes small, the power consumption of the power amplifier tube is reduced, the temperature of the power amplifier is reduced, the temperature detection value Vt1 becomes small, and finally the temperature of the power amplifier is stabilized at the threshold temperature; the worse the heat dissipation environment of the power amplifier is, the larger the heat dissipation environment is controlled by Vp, the larger the attenuation is, and the smaller the output power of the final-stage power amplifier tube is; under the condition that the power amplifier temperature is increased due to the increase of the environment temperature and the deterioration of the heat dissipation condition under the general condition, the attenuation of the controllable attenuator U1 is adjusted according to the actual condition, the attenuation is larger when the environment temperature is higher and the heat dissipation condition is worse, but the temperature detection value Vt1 is always equal to the temperature threshold reference value Vt2 and is neither low nor high. Only one case results in the temperature detection value Vt1 of the power amplifier being greater than the temperature threshold reference value Vt 2: the temperature of the module is sharply increased, and the power amplifier reduces power consumption by a measure that the temperature reduction needs a process and cannot rapidly reduce the temperature, but the attenuation of the controllable attenuator is directly increased to the maximum value under the condition so that the power amplifier realizes the maximum speed temperature reduction. In addition, the circuit of the embodiment is reversible, when the temperature is reduced and the temperature detection value Vt1 is smaller than the temperature threshold reference value Vt2, the smaller the control of the controllable attenuator U1 by the Vp control signal Vp value, the smaller the attenuation amount is, and the larger the output power of the power amplifier tube is.
The attenuation control circuit of the embodiment has small time delay, so the attenuation control circuit has fast response speed to temperature change, can well protect the power amplifier at high temperature and can quickly recover the power amplifier when the temperature is reduced; the attenuation of the attenuator is directly controlled through the differential integration circuit 5, the delay is small, the power consumption of the power amplifier can be adjusted in real time, the temperature of the module is equal to the preset threshold temperature, and the power of the power amplifier cannot be excessively reduced for cooling; the power amplifier can also be directly output with the minimum power to rapidly reduce the temperature of the module in the environment with the rapidly increased temperature, and compared with a control mechanism that the preset power value is firstly reduced, then the temperature is detected, and the attenuation is increased after a plurality of cycles in the traditional scheme, the power amplifier can be better protected by the embodiment.
Correspondingly, the invention also provides a power amplifier control method based on automatic level control, as shown in fig. 5, the method comprises the following steps:
The temperature value of the power amplifier can be subjected to reasonable digital-to-analog conversion or analog-to-digital conversion according to the temperature detection value in the step 104 and the required temperature value in the step 102;
102, calculating the current value of the power amplifier input power control signal according to the reference temperature and the current temperature
The reference temperature is a preset limit temperature reference value which can be born by the power amplifier; the power amplifier input power control signal is used for controlling the voltage, the digital signal and the like of the power amplifier input power, and can control the magnitude of the power amplifier input power; the current value of the power amplifier input power control signal can be adjusted in a self-adaptive mode according to the initial value of the power amplifier input power control signal and the difference value between the reference temperature and the current temperature, and the purpose of the invention is to ensure that the normal output of the power amplifier is not changed when the power amplifier temperature is lower than the preset limit temperature, reduce the power of the power amplifier when the power amplifier temperature exceeds the preset limit temperature and reduce the power amplifier temperature.
The calculation mode is that the current value is equal to the initial value + (reference temperature value-current temperature value) formula (1)
Or the current value is the initial value- (reference temperature value-current temperature value) formula (2)
Furthermore, the calculation mode selects a control mode depending on the input power control signal of the power amplifier, if the value of the input power control signal of the power amplifier is reduced, the input power of the power amplifier is reduced, the formula (1) is selected, and if the value of the input power control signal of the power amplifier is increased, the input power of the power amplifier is reduced, the formula (2) is selected;
furthermore, the invention is a closed loop system, and the initial value is the current value of the previous time point or the previous temperature sampling point;
furthermore, according to practical application, the reference temperature value and the current temperature value can be multiplied by the same coefficient, so as to ensure that the difference value of the reference temperature and the current temperature is matched with an initial value or the magnitude of the control signal value of the input power of the power amplifier, and ensure the validity and the stability of the current value of the control signal of the input power of the power amplifier;
furthermore, in order to achieve the effectiveness and stability of the calculation and ensure that the voltage of the power amplifier input power control signal also has the maximum and minimum range in practical application, the current value in the formula needs to be limited by adding the range, and the maximum value Vmax and the minimum value Vmin of the power amplifier input power control signal value are set.
For example, in formula (1), the current value of the power amplifier input power control signal has 3 states:
when the reference temperature value is larger than the current temperature, according to the formula (1), the current value of the power amplifier input power control signal is always in a rising state, and the attenuation value controls the signal value to reach the maximum value Vmax; at the moment, the control signal value of the input power of the power amplifier reaches the maximum, the attenuation of the attenuator is the minimum, and the output power of the power amplifier is kept unchanged at normal output; the power amplifier is normal in temperature at the moment, and the power amplifier works in a normal environment.
When the reference temperature value is equal to the current temperature, according to the formula (1), the current value of the power amplifier input power control signal is in a stable state, and the current value of the power amplifier input power control signal is between the maximum value Vmax and the minimum value Vmin; at the moment, the attenuator has a certain attenuation amount, and the output power of the power amplifier is reduced to a certain extent; the working environment of the power amplifier is deteriorated at the moment, but the power amplifier can work normally under the condition of sacrificing the output power of the power amplifier.
When the reference temperature value is lower than the current temperature, according to the formula (1), the current value of the power amplifier input power control signal is always in a descending state, and the descending speed is higher when the current temperature value is higher, so that the power amplifier can be better protected when the temperature is sharply and rapidly worsened; when the current value of the power amplifier input power control signal reaches the minimum value Vmin, the output power of the power amplifier is minimum, and the power amplifier works with the minimum power consumption;
and 103, adjusting the input power of the power amplifier, and optimizing the power consumption and the temperature of the power amplifier.
Adjusting the input power of the power amplifier by obtaining the current value of the power amplifier input power control signal, thereby adjusting the power consumption and the temperature of the power amplifier;
and step 104, detecting the temperature of the power amplifier.
Detecting the current power amplifier temperature by using a temperature detection device; optionally, the temperature detection device may include a temperature sensor and a thermistor;
the method for realizing the system by selecting the formula (1) is specifically described under the condition that the input power of the power amplifier can be reduced by reducing the value of the control signal of the input power of the power amplifier:
firstly, the system works normally, the power amplifier temperature is detected, when the reference temperature value is larger than the current temperature, the current value of the power amplifier input power control signal is always in an ascending state according to the formula (1), and quickly reaches the set maximum value Vmax and keeps unchanged, the attenuation of the attenuator is minimum at the moment, and the power amplifier output power is kept at the maximum output power (normal output). When the temperature gradually rises and the reference temperature value is equal to the current temperature, according to the formula (1), the current value of the power amplifier input power control signal is in a critical state of the maximum value Vmax, if the temperature continues to rise, the current value of the power amplifier input power control signal is in a falling state, the larger the current temperature value is, the higher the falling speed is, at the moment, the current value of the power amplifier input power control signal is reduced, and the power amplifier output power falls to cause the falling of the power amplifier temperature; because the system is a closed loop system, the current value of the power amplifier input power control signal enters new calculation until the reference temperature value is equal to the current temperature value; at the moment, the current value of the power amplifier input power control signal is between the maximum value Vmax and the minimum value Vmin, the output power of the power amplifier is reduced to a certain extent, but the temperature of the power amplifier is stabilized at the limit temperature and is not deteriorated continuously, so that the system can work continuously under the condition of sacrificing a certain output power.
The system of the invention is reversible, when the temperature of the power amplifier is reduced to be less than the reference temperature, according to the formula (1), the current value of the power amplifier input power control signal is in the rising state, the current value of the power amplifier input power control signal is gradually increased, the output power and the temperature of the power amplifier are also gradually increased until the current value of the power amplifier input power control signal enters the stable state again and even returns to the normal working state (the power amplifier outputs normal power, and the current temperature of the power amplifier is less than the limit temperature).
Compared with the traditional temperature detection and protection scheme, the closed-loop adaptive detection system and the calculation mode of the current value of the power amplifier input power control signal can quickly reduce the temperature of the module to the preset limit temperature in a high-temperature environment, and the power of the power amplifier cannot be excessively reduced for cooling; meanwhile, in an environment with sharply-increased temperature, the power amplifier can directly output the minimum power to quickly reduce the temperature of the module, and the purpose of protecting the power amplifier is better achieved.
Example 2: as shown in fig. 2, the differential integrator circuit of the embodiment 1 further includes a voltage control circuit U4, a first input port of the voltage control circuit U4 is connected to a standard voltage Vg1, and a second input port is connected to an output port of the differential integrator circuit U5, and receives a control signal Vp; an output port of the voltage control circuit U4 is connected with a power supply input port of the final power amplifier tube U3; the power supply port of the final power amplifier tube is connected with an output signal Vg2 of a voltage control circuit U4.
In this embodiment, the voltage control circuit U4 has interchangeability between a digital circuit and an analog circuit, and as shown in fig. 4, the voltage control circuit in the form of a digital circuit includes an ADC, a DAC, and a single chip microcomputer Q5, and 2 input signals Vp and Vg 1; wherein Vp is the output control signal of the differential integration circuit; vg1 is a digital value of the control voltage of the final power amplifier tube at normal temperature; vg2 is the control voltage of the final power amplifier tube; q4 is an analog-to-digital converter, completes the analog-to-digital conversion function, converts Vp into a digital signal and inputs the digital signal to the singlechip Q5; the Q5 is a singlechip, and outputs a digital value Vg3 of the final-stage power amplifier control voltage according to a preset rule or algorithm according to two input signals Vp and Vg 1; q6 is a digital-to-analog converter, and converts the output signal Vg3 of the singlechip into an analog signal Vg 2; the differential integration circuit outputs a control signal Vp, then the control signal Vp is input into the ADC and converted into a digital signal, the conversion between Vp, Vg1 and the voltage control circuit output Vg2 is completed in a digital domain, and finally the DAC outputs Vg2 and controls the static change of the final stage power amplifier tube U3.
As another alternative, the voltage control circuit U4 may also be an analog circuit, one of which includes an adder, a voltage divider circuit, etc., where the input of the voltage divider circuit is connected to the output control signal Vp and the output is connected to the first input port of the adder; the second input port of the adder is connected with a standard voltage Vg 1; the output signal Vg2 of the adder is connected with the final power amplifier tube. When the power amplifier temperature is not less than the temperature threshold reference value, Vp jumps, the voltage drops, Vg2 passing through the voltage division circuit and the adder is reduced, and the static current of the final-stage power amplifier tube is reduced. The other mode comprises a subtracter, a voltage division circuit and the like, wherein the input end of the voltage division circuit is connected with an output control signal Vp, and the output end of the voltage division circuit is connected with a first input port of the subtracter; the second input port of the subtracter is connected with a standard voltage Vg 1; the output signal Vg2 of the subtracter is connected with the final power amplifier tube. When the power amplifier temperature is not less than the temperature threshold reference value, Vp jumps, the voltage rises, Vg2 passing through the voltage division circuit and the subtracter is reduced, and the static current of the final-stage power amplifier tube is reduced.
The working principle of the embodiment is as follows: in this embodiment, the voltage control circuit U4 receives the control signal Vp, and when the power amplifier temperature is smaller than the temperature threshold reference value, the control signal Vp is unchanged, the output signal Vg2 of the voltage control circuit U4 is also unchanged, and the final stage power amplifier tube normally operates. When the power amplifier temperature is not less than the temperature threshold reference value, the control signal Vp jumps, the output signal Vg2 of the voltage control circuit U4 can be set to a preset proportion to be smaller, the static current of the final-stage power amplifier tube is smaller, the power consumption of the whole power amplifier is also smaller, and the power consumption index of the power amplifier can be further improved; at this time, Vp jumps, the attenuation of the controllable attenuation current U1 is large, which causes the output power of the final power amplifier tube U3 to decrease, so that the quiescent current of the final power amplifier tube U3 is reasonably reduced without causing the linearity deterioration of the output signal, and meanwhile, the final power amplifier tube U3 has an active effect on reducing the power consumption, under the condition of reducing the same power consumption, the attenuation of the controllable attenuation circuit in the embodiment can be significantly reduced compared with the first embodiment, and the power of the output signal of the power amplifier can be significantly increased. Specifically, the method comprises the following steps: the temperature detection circuit U6 detects the temperature of the power amplifier and converts the temperature into a first input signal Vt1 of the differential integration circuit U5, the differential integration circuit U5 receives a temperature detection value Vt1 and a temperature threshold reference value Vt2 of a temperature detection chip and compares the two values to output a control signal Vp, when the temperature detection value Vt1 is small, namely the temperature of the power amplifier is low, the value of the control signal Vp is kept unchanged, the attenuation of the controllable attenuator U1 is not changed at the moment, the static current of the power amplifier tube is also kept unchanged, and finally the output power of the power amplifier is kept constant; when the temperature detection value Vt1 is equal to the temperature threshold reference value Vt2, namely the power amplifier temperature is equal to the threshold temperature, the value of the control signal Vp jumps, and the controllable attenuator U1 and the voltage control circuit start to be controlled by Vp; if the temperature detection value Vt1 continues to rise, the controllable attenuator U1 is controlled by Vp to increase the attenuation, at this time, the output power of the final power amplifier tube becomes small, the power consumption of the power amplifier tube is reduced, the temperature of the power amplifier is reduced, the temperature detection value Vt1 becomes small, and finally the temperature of the power amplifier is stabilized at the threshold temperature; the worse the heat dissipation environment of the power amplifier is, the larger the heat dissipation environment is controlled by Vp, the larger the attenuation is, and the smaller the output power of the final-stage power amplifier tube is; meanwhile, the output voltage Vg2 of the voltage control circuit U4 controlled by Vp is reduced according to a preset proportion, so that the grid voltage of the final-stage power amplification tube is reduced, and the power consumption of the final-stage power amplification tube is also reduced; the two operations reduce the power consumption of the final power amplifier tube, so that the temperature of the power amplifier is reduced, the temperature detection value Vt1 is reduced, and finally the temperature of the power amplifier is stabilized at the threshold temperature; compared with the first embodiment, the control of the controllable attenuation circuit is unchanged, but because the voltage control circuit U4 is added to perform static optimization on the final-stage power amplifier tube, the power consumption of the power amplifier module is greatly reduced, the temperature of the power amplifier can be obviously reduced, and therefore the attenuation of the controllable attenuation module is reduced, and the output power of the power amplifier under the same power consumption can be obviously improved; meanwhile, when the output power of the final power amplifier tube U3 is reduced, the static current of the final power amplifier tube U3 is reasonably reduced, and the linearity of the output signal is not deteriorated.
Compared with the traditional scheme, the scheme considers that the reasonable reduction of the quiescent current does not cause the linear deterioration of the power amplifier but can greatly reduce the power consumption of the power amplifier when the power amplifier power is reduced, thereby increasing the static adjusting function of the power amplifier tube, reducing more power amplifier power consumption under the condition of the same output power or reserving more output power under the condition of reducing the same power amplifier power consumption. Under extreme conditions, the attenuation of the controllable attenuator reaches the maximum, the quiescent current of the power amplifier tube is greatly reduced, the power consumption of the power amplifier is reduced to the minimum, the temperature of the power amplifier is close to the power amplifier temperature in a completely closed state, but certain output power can be reserved, the whole communication system can reserve partial communication capacity, and the scheme is greatly improved compared with the scheme that the power amplifier can be completely closed after the output power of the traditional power amplifier is reduced to a certain degree.
Correspondingly, the present invention further provides a second power amplifier control method based on automatic level control, as shown in fig. 6, the difference between the method and the first method is: step 103, adjusting the input power of the power amplifier in the original step, and adding the added static power consumption for adjusting the final power amplifier tube after optimizing the power consumption and the temperature of the power amplifier, and deeply optimizing the power consumption and the temperature of the power amplifier;
The temperature value of the power amplifier can be subjected to reasonable digital-to-analog conversion or analog-to-digital conversion according to the temperature detection value in the step 104 and the required temperature value in the step 102;
and 102, calculating the current value of the power amplifier input power control signal according to the reference temperature and the current temperature.
The reference temperature is a preset limit temperature reference value which can be born by the power amplifier; the power amplifier input power control signal is used for controlling the voltage, the digital signal and the like of the power amplifier input power, and can control the magnitude of the power amplifier input power; the current value of the power amplifier input power control signal can be adjusted in a self-adaptive mode according to the initial value of the power amplifier input power control signal and the difference value between the reference temperature and the current temperature, and the purpose of the invention is to ensure that the normal output of the power amplifier is not changed when the power amplifier temperature is lower than the preset limit temperature, reduce the power of the power amplifier when the power amplifier temperature exceeds the preset limit temperature and reduce the power amplifier temperature.
The calculation mode is that the current value is equal to the initial value + (reference temperature value-current temperature value) formula (3)
Or the current value is the initial value- (reference temperature value-current temperature value) formula (4)
Further, the calculation mode selects a control mode depending on the input power control signal of the power amplifier, if the value of the input power control signal of the power amplifier is reduced, the input power of the power amplifier is reduced, the formula (3) is selected, and if the value of the input power control signal of the power amplifier is increased, the input power of the power amplifier is reduced, the formula (4) is selected;
furthermore, the invention is a closed loop system, and the initial value is the current value of the previous time point or the previous temperature sampling point;
furthermore, according to practical application, the reference temperature value and the current temperature value can be multiplied by the same coefficient, so as to ensure that the difference value of the reference temperature and the current temperature is matched with an initial value or the magnitude of the control signal value of the input power of the power amplifier, and ensure the validity and the stability of the current value of the control signal of the input power of the power amplifier;
furthermore, in order to achieve the effectiveness and stability of the calculation and ensure that the voltage of the power amplifier input power control signal also has the maximum and minimum range in practical application, the current value in the formula needs to be limited by adding the range, and the maximum value Vmax and the minimum value Vmin of the power amplifier input power control signal value are set.
For example, in equation (3), the current value of the power amplifier input power control signal has 3 states:
when the reference temperature value is larger than the current temperature, according to the formula (3), the current value of the power amplifier input power control signal is always in a rising state, and the attenuation value controls the signal value to reach the maximum value Vmax; at the moment, the control signal value of the input power of the power amplifier reaches the maximum, the attenuation of the attenuator is the minimum, and the output power of the power amplifier is kept unchanged at normal output; the power amplifier is normal in temperature at the moment, and the power amplifier works in a normal environment.
When the reference temperature value is equal to the current temperature, according to the formula (3), the current value of the power amplifier input power control signal is in a stable state, and the current value of the power amplifier input power control signal is between the maximum value Vmax and the minimum value Vmin; at the moment, the attenuator has a certain attenuation amount, and the output power of the power amplifier is reduced to a certain extent; the working environment of the power amplifier is deteriorated at the moment, but the power amplifier can work normally under the condition of sacrificing the output power of the power amplifier.
When the reference temperature value is lower than the current temperature, according to the formula (3), the current value of the power amplifier input power control signal is always in a descending state, and the descending speed is higher when the current temperature value is higher, so that the power amplifier can be better protected when the temperature is sharply and rapidly worsened; when the current value of the power amplifier input power control signal reaches the minimum value Vmin, the output power of the power amplifier is minimum, and the power amplifier works with the minimum power consumption;
and 103, adjusting the input power of the power amplifier, and optimizing the power consumption and the temperature of the power amplifier.
Adjusting the input power of the power amplifier by obtaining the current value of the power amplifier input power control signal, thereby adjusting the power consumption and the temperature of the power amplifier;
and step 104, adjusting the static power consumption of the power amplifier tube, and deeply optimizing the power consumption and the temperature of the power amplifier.
Static power consumption of the power amplifier tube is static current and power voltage; the quiescent current and the supply voltage of the power amplifier tube in the power amplifier are generally fixed, and the power consumption generated by the quiescent current and the supply voltage is larger, so that the normal work of the power amplifier tube is ensured by the large quiescent current and the large supply voltage when the power amplifier tube outputs high power, but the proper reduction of the quiescent current and the supply voltage of the power amplifier tube does not influence the normal work of the power amplifier tube when the power amplifier tube outputs low power, and the power consumption of the power amplifier tube can be effectively reduced. Therefore, the change of the output power of the power amplifier is determined through the current value of the control signal of the input power of the power amplifier, and the power consumption of the power amplifier can be effectively improved by controlling the reasonable setting of the quiescent current or the power supply voltage of the power amplifier tube, so that the temperature of the power amplifier is improved;
further, the static power consumption of the power amplifier may be controlled by controlling the gate voltage of the power amplifier tube, and when the current value of the power amplifier input power control signal reduces the output power of the power amplifier, the gate voltage of the power amplifier tube may be controlled to be reduced according to a preset proportion, so as to optimize the static power consumption of the power amplifier tube, where the proportion needs to be determined according to the characteristics of the actual power amplifier tube.
Furthermore, the mode of controlling the static power consumption of the power amplifier tube may be to control the power supply voltage of the power amplifier tube, and when the current value of the power amplifier input power control signal reduces the power amplifier output power, the drain voltage of the power amplifier tube may be controlled to be reduced according to a preset proportion, so as to optimize the static power consumption of the power amplifier tube, where the proportion needs to be determined according to the characteristics of the actual power amplifier tube.
Furthermore, the mode of controlling the static power consumption of the power amplifier tube can be a mode of combining a control gate voltage and a drain voltage, when the current value of the power amplifier input power control signal reduces the power amplifier output power, the control gate voltage and the drain voltage are reasonably adjusted, and the static power consumption of the power amplifier tube is reduced; the method can reduce the power consumption of the power amplifier tube to the minimum.
And 105, detecting the temperature of the power amplifier.
Detecting the current power amplifier temperature by using a temperature detection device; optionally, the temperature detection device may include a temperature sensor and a thermistor;
the method for realizing the system is specifically explained by selecting an equation (3) under the condition that the input power of the power amplifier can be reduced by reducing the value of the control signal of the input power of the power amplifier:
firstly, the system works normally, the power amplifier temperature is detected, when the reference temperature value is larger than the current temperature, the current value of the power amplifier input power control signal is always in an ascending state according to the formula (3), and quickly reaches the set maximum value Vmax and keeps unchanged, the attenuation of the attenuator is minimum at the moment, and the power amplifier output power is kept at the maximum output power (normal output). When the temperature gradually rises and the reference temperature value is equal to the current temperature, according to the formula (1), the current value of the power amplifier input power control signal is in a critical state of the maximum value Vmax, if the temperature continues to rise, the current value of the power amplifier input power control signal is in a falling state, the larger the current temperature value is, the higher the falling speed is, at the moment, the current value of the power amplifier input power control signal is reduced, and the power amplifier output power falls to cause the falling of the power amplifier temperature; meanwhile, the static power consumption of the power amplifier tube is reduced by reducing the current value of the power amplifier input power control signal, and the power consumption of the whole power amplifier can be further reduced; because the system is a closed loop system, the current value of the power amplifier input power control signal enters new calculation until the reference temperature value is equal to the current temperature value; at the moment, the current value of the power amplifier input power control signal is between the maximum value Vmax and the minimum value Vmin, the output power of the power amplifier is reduced to a certain extent, but the temperature of the power amplifier is stabilized at the limit temperature and is not deteriorated continuously, so that the system can work continuously under the condition of sacrificing a certain output power.
The system of the invention is reversible, when the temperature of the power amplifier is reduced to be less than the reference temperature, according to the formula (1), the current value of the power amplifier input power control signal is in the rising state, the current value of the power amplifier input power control signal is gradually increased, the output power and the temperature of the power amplifier are also gradually increased until the current value of the power amplifier input power control signal enters the stable state again and even returns to the normal working state (the power amplifier outputs normal power, and the current temperature of the power amplifier is less than the limit temperature).
Compared with the first method, the method considers that the efficiency of the power amplifier is inversely proportional to the output power of the power amplifier, namely the efficiency of the power amplifier is worse when the output power of the power amplifier is smaller, and the reduction of the output power of the power amplifier cannot obviously reduce the power consumption when the output power of the power amplifier is reduced to a certain degree; meanwhile, the power consumption of the power amplifier is reduced in consideration that the reasonable reduction of static power consumption of the power amplifier tube during derating output does not cause the deterioration of the linearity of the power amplifier; the static power consumption adjusting function of the power amplifier tube is creatively added, and more power amplifier power consumption is reduced under the condition of the same output power or more output power is reserved under the condition of reducing the same power amplifier power consumption. Under extreme conditions, the method reduces the input power of the power amplifier, reduces the static power consumption of the power amplifier tube, can reduce the power consumption of the power amplifier to the minimum (close to the power amplifier closing state), but can also keep a certain output power, so that the whole communication system can also keep partial communication capacity.
It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.
Claims (7)
1. The utility model provides a power amplifier control system based on automatic level control which characterized in that: the device mainly comprises a controllable attenuation circuit, a signal transmission circuit, a final-stage power amplifier tube, a differential integration circuit and a temperature detection circuit; wherein,
the first input end of the controllable attenuation circuit is connected with the signal input, the second input end of the controllable attenuation circuit is connected with the output control signal Vp of the differential integration circuit, and the output end of the controllable attenuation circuit is connected with the input end of the signal transmission circuit;
the output end of the signal transmission circuit is connected with the input end of the final-stage power amplifier tube;
the output end of the final-stage power amplifier tube is used for outputting signals;
the temperature detection circuit is used for detecting the temperature of the final-stage power amplifier tube;
the first input end of the differential integration circuit is connected with a temperature detection value Vt1 at the output end of the temperature detection circuit, and the second input end of the differential integration circuit is connected with a temperature threshold reference value Vt 2;
the differential integration circuit compares the input Vt1 and Vt2, and controls the attenuation of the controllable attenuator according to the comparison result output Vp;
the differential integration circuit mainly comprises a comparator, wherein the input end of the comparator is respectively connected with Vt2 and Vt1 of the output end of the temperature detection circuit; when Vt1 is smaller than Vt2, the attenuation of the controllable attenuation circuit is not increased by the output Vp of the comparator, and the signal output power is not changed; when Vt1 is larger than or equal to Vt2, the output Vp of the comparator jumps, the attenuation of the controllable attenuation circuit is increased, the signal output power starts to be reduced, and finally Vt1 is equal to Vt 2;
the power amplifier control system based on automatic level control further comprises a voltage control circuit, wherein the first input end of the voltage control circuit is connected with a standard voltage Vg1, the second input end of the voltage control circuit is connected with Vp of the differential integration circuit, and the power supply end of the final power amplifier tube is connected with an output signal Vg2 of the voltage control circuit; when Vt1 is smaller than Vt2, Vp is unchanged, Vg2 is also unchanged, and the final-stage power amplifier tube works normally; when Vt1 is not less than Vt2, Vp jumps, Vg2 decreases according to a preset ratio, the quiescent current of the final stage power amplifier decreases, and the power consumption of the entire final stage power amplifier also decreases.
2. The automatic level control based power amplifier control system according to claim 1, wherein: the Vp jump of the differential integration circuit comprises voltage rise or voltage drop, if the attenuation of the control voltage drop of the controllable attenuation circuit is increased, the Vp jump is voltage drop, otherwise, if the attenuation of the control voltage rise of the controllable attenuation circuit is increased, the Vp jump is voltage rise.
3. The automatic level control based power amplifier control system according to claim 1, wherein: the controllable attenuation circuit comprises a voltage-controlled attenuator.
4. The automatic level control based power amplifier control system according to claim 1, wherein: the temperature detection circuit comprises an analog temperature detection device or a thermistor.
5. The automatic level control based power amplifier control system according to claim 1, wherein: the voltage control circuit adopts a digital circuit and mainly comprises an ADC, a DAC and a singlechip, wherein Vp output by the differential integration circuit is converted into a digital signal after being input into the ADC, conversion among Vp, Vg1 and Vg2 is completed in a digital domain, and finally Vg2 is output by the DAC and static current change of a final-stage power amplifier tube is controlled.
6. The automatic level control based power amplifier control system according to claim 1, wherein: the voltage control circuit adopts an analog circuit and mainly comprises an adder and a voltage division circuit, wherein the input end of the voltage division circuit is connected with Vp, and the output end of the voltage division circuit is connected with a first input port of the adder; the second input port of the adder is connected with Vg 1; an output signal Vg2 of the adder is connected with a final-stage power amplifier tube; when the temperature of the final power amplifier tube is not less than Vt2, Vp jumps and the voltage drops, then Vg2 obtained after the voltage divider circuit and the adder is reduced, and the quiescent current of the final power amplifier tube becomes small.
7. The automatic level control based power amplifier control system according to claim 1, wherein: the voltage control circuit adopts an analog circuit and mainly comprises a subtracter and a voltage division circuit, wherein the input end of the voltage division circuit is connected with Vp, and the output end of the voltage division circuit is connected with a first input port of the subtracter; the second input port of the subtracter is connected with Vg 1; an output signal Vg2 of the subtracter is connected with a final-stage power amplifier tube; when the temperature of the final power amplifier tube is not less than Vt2, Vp jumps and the voltage rises, Vg2 obtained by the voltage division circuit and the subtracter is reduced, and the static current of the final power amplifier tube is reduced.
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| CN112019250B (en) * | 2020-10-29 | 2021-05-11 | 三维通信股份有限公司 | Method and device for automatically adjusting over-temperature power and storage medium |
| CN114265450B (en) * | 2021-12-22 | 2023-01-20 | 杭州长川科技股份有限公司 | Output control method and device of high-power amplifier and electronic equipment |
| CN114506243B (en) * | 2022-01-26 | 2024-01-23 | 北京海博思创科技股份有限公司 | Power control method for vehicle-mounted battery system and vehicle-mounted battery management device |
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| CN107734427A (en) * | 2017-09-13 | 2018-02-23 | 广州市迪士普信息科技有限公司 | A kind of guard method and device according to voice coil loudspeaker voice coil temperature rise adjust automatically speaker volume |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110351630A (en) | 2019-10-18 |
| WO2020253202A1 (en) | 2020-12-24 |
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