CN117579008B - Overload signal prevention automatic adjusting device and adjusting method for power amplifier system - Google Patents
Overload signal prevention automatic adjusting device and adjusting method for power amplifier system Download PDFInfo
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- CN117579008B CN117579008B CN202410063688.1A CN202410063688A CN117579008B CN 117579008 B CN117579008 B CN 117579008B CN 202410063688 A CN202410063688 A CN 202410063688A CN 117579008 B CN117579008 B CN 117579008B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
- H03F1/12—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of attenuating means
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses an overload signal prevention automatic regulating device and a regulating method thereof for a power amplification system, and belongs to the technical field of power amplification. The radio frequency input port is connected with the input end of the voltage-controlled attenuation adjusting unit, the signal output end of the voltage-controlled attenuation adjusting unit is connected with the signal input end of the power divider, the signal output end of the power divider is connected with the input end of the first detection chip and the signal input end of the power amplifier, the signal output end of the power amplifier is connected with the signal input end of the coupler, the signal output end of the coupler is connected with the input end of the second detection chip and the radio frequency output port, the first detection chip outputs an overdriving detection signal, the second detection chip outputs a forward detection signal, the signal input end of the control and protection adjusting unit is connected with the output ends of the first detection chip and the second detection chip, and the signal output end of the control and protection adjusting unit is connected with the voltage-controlled attenuation adjusting unit. According to the differential operation result of the overdrive detection signal and the forward detection signal, the attenuation of the voltage-controlled attenuation adjusting unit is adjusted in real time.
Description
Technical Field
The invention belongs to the technical field of power amplification, and particularly relates to an overload signal prevention automatic adjusting device and an adjusting method for a power amplification system.
Background
The protection commonly used in the current power amplification system in China is input overdrive protection and output standing wave protection. The over-standing wave protection is the protection capability of the system output mismatch condition, the over-excitation protection is that the radio frequency signal input by the power amplifier is firstly detected, the radio frequency signal is converted into an electric signal of analog quantity, the analog signal is then sent to the control protection system, the control protection system analyzes the signal, and when the signal is larger than a set threshold value, the control protection system gives an alarm signal and cuts off the power supply of the power amplifier module, thereby achieving the purpose of protecting the power amplifier.
Because the input signals of different frequency points of the broadband power amplification system are inconsistent in size, the detected analog signals have huge differences, even if the input signals of the system are consistent in size, the detection system is different in detection size of different frequency points, the huge differences of the two differences are combined, the signals sent to the control and protection system by the power amplification system at different frequency points are caused, the threshold value set by the control and protection system is a fixed value and cannot be changed along with the change of the frequency points, so that overdrive protection can only protect one frequency point with the maximum detection of the system or a plurality of similar frequency points, and cannot protect all frequency points in the frequency band of the power amplification system.
Disclosure of Invention
The invention aims to: the overload signal prevention automatic regulating device and the regulating method thereof for the power amplifier system solve the problems in the prior art.
The technical scheme is as follows: an overload signal prevention automatic regulating apparatus for a power amplifier system, comprising:
the voltage-controlled attenuation adjusting unit is used for adjusting an input signal; the signal output end of the voltage-controlled attenuation adjusting unit is connected with the signal input end of the power divider, the signal output end of the power divider is simultaneously connected with the input end of the first detection chip and the signal input end of the power amplifier, the signal output end of the power amplifier is connected with the signal input end of the coupler, and the signal output end of the coupler is simultaneously connected with the input end of the second detection chip and the radio frequency output port; the power divider is connected with the first detection chip to output an overdriving detection signal, and the coupler is connected with the second detection chip to output a forward detection signal;
the signal input end of the control protection adjusting unit is connected with the output ends of the first detection chip and the second detection chip, the signal output end of the control protection adjusting unit is in control connection with the voltage-controlled attenuation adjusting unit, and the control protection adjusting unit is used for receiving the overdrive detection signal output by the first detection chip and the forward detection signal output by the second detection chip, and performing differential operation on the overdrive detection signal and the forward detection signal to obtain corresponding differential quantity;
and the signal input end of the alarm power-off unit is connected with the signal output end of the control and protection adjusting unit, and the alarm power-off unit is controlled and connected with a power supply of the power amplifier.
Preferably, the differential operation mode is as follows:
when the signal is in the linear region of the power amplifier, the input signal is increased by 1dB, the output signal is also increased by 1dB, and at the moment, the signal input and the signal output are synchronously changed, namely the differential quantity is not changed, and the control and protection adjusting unit does not have protection action;
when the signal is in the saturation region of the power amplifier, the input signal is increased by 1dB, the variation of the output signal is less than 1dB until the input signal is increased again, the output signal is unchanged, the power amplifier enters deep saturation, and the numerical value of the difference quantity of the signal input and the signal output is gradually increased at the moment;
the differential component threshold value is preset, the calculated differential component is compared with the preset differential component threshold value, and according to the comparison result, the control and protection regulating unit sends corresponding signals to the voltage-controlled attenuation regulating unit or the alarm power-off unit, and the attenuation regulating unit is controlled to regulate the attenuation of the voltage-controlled attenuation regulating unit or the alarm power-off unit is matched to control the power on and off of the power amplifier.
Preferably, the voltage-controlled attenuation adjusting unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a variable resistor VR1, a capacitor C2, a capacitor C3, an amplifier U1, an amplifier U2 and a chip U3, wherein the resistor R1 is connected with the capacitor C1 in parallel, one end of the resistor R1 is connected with a signal input end, the other end of the resistor R1 is connected with a pin 5 of the amplifier U2, a pin 8 of the amplifier U2 is connected with an external power supply, a pin 4 of the amplifier U2 is grounded, a pin 7 of the amplifier U2 is simultaneously connected with the resistor R2 and a pin 6 of the amplifier U2, the other end of the resistor R2 is simultaneously electrically connected with the resistor R4 and the pin 3 of the amplifier U1, a pin 2 of the amplifier U1 is connected with the resistor R5, the pin 1 of the amplifier U1 is electrically connected with the resistor R6, the resistor R3 and the capacitor C2 at the same time, the other end of the resistor R5 is electrically connected with the other end of the resistor R6 and the pin 3 of the variable resistor VR1 at the same time, the other end of the resistor R4 is connected with the pin 1 of the variable resistor VR1 and grounded, the pin 2 of the variable resistor VR1 is connected with the resistor R7, the other end of the resistor R7 is connected with an external power supply, the other end of the resistor R3 is electrically connected with the capacitor C3 and the pin 15 of the chip U3 at the same time, the other end of the capacitor C2 is connected with the other end of the capacitor C3 and grounded, the pin 14 of the chip U3 is connected with the external power supply, the pin 1 of the chip U3 is connected with the pin 2 of the chip U3, the pin 16 of the chip U3 is grounded, the pin 4 of the chip U3 is connected with the pin 5 of the chip U3, the pin 6, the pin 7 and the pin 8 of the chip U3 is grounded, and the pin 11 of the chip U3 is grounded.
Preferably, the amplifier U1 and the amplifier U2 are both ADA4891-2 type amplifiers, and the chip U3 is an RFSA2113 type chip.
Preferably, the alarm power-off unit comprises a resistor R8, a resistor R9, a field effect transistor Q1 and a triode Q2, wherein one end of the resistor R9 is connected with the control end, the other end of the resistor R9 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is simultaneously connected with the resistor R8 and the grid electrode of the field effect transistor Q1, the other end of the resistor R8 is connected with the drain electrode of the field effect transistor Q1 and is connected with the voltage input end, and the source electrode of the field effect transistor Q1 is connected with the voltage output end.
Preferably, the field effect transistor Q1 is a MOSFET-P type field effect transistor.
Preferably, the triode Q2 is a BC847x type triode.
An overload-prevention automatic adjusting method for a power amplifier system comprises the following steps:
step S1, a signal input end of the voltage-controlled attenuation adjusting unit is connected with a radio frequency input port, a signal output end of the voltage-controlled attenuation adjusting unit is connected with a signal input end of a power divider, a signal output end of the power divider is respectively connected with a signal input end of a power amplifier and a signal input end of a detection chip I, a signal output end of the power amplifier is connected with a signal input end of a coupler, a signal output end of the coupler is respectively connected with a signal input end of a detection chip II and a radio frequency output port, a signal output end of the control and protection adjusting unit is connected with a signal input end of the voltage-controlled attenuation adjusting unit and a signal input end of an alarm power-off unit, and the alarm power-off control is connected with a power supply of the power amplifier;
s2, dividing a signal output by the voltage-controlled attenuation adjusting unit into two paths of signals after passing through the power divider, wherein one path of signal enters the first detection chip and then outputs an overdriving detection signal, and the other path of signal enters the second detection chip through the power amplifier and the coupler and then outputs a forward detection signal, and when the overdriving detection signal and the forward detection signal are in an unsaturated zone, the overdriving detection signal and the forward detection signal are both in a linear growth zone;
step S3, the control and protection adjusting unit receives the overdrive detection signal output by the first detection chip and the forward detection signal output by the second detection chip in the step S2, and performs differential operation on the overdrive detection signal and the forward detection signal to obtain differential values of the overdrive detection signal and the forward detection signal;
and S4, presetting a differential component threshold, wherein the differential component threshold is a fixed value, comparing the differential component in the step S3 with the differential component threshold, and adjusting the attenuation of the voltage-controlled attenuation adjusting unit in real time or sending a signal to the alarm power-off unit according to the comparison result, and controlling the power amplifier to power off through the alarm power-off unit to finish the protection of the output power of the frequency point in the frequency band.
Preferably, the overdrive detection signal in step S2 is denoted as a, the forward detection signal in step S2 is denoted as B, and the difference in step S3 is denoted as C;
when the overdrive detection signal A and the forward detection signal B are in a linear amplification region, the value of the differential quantity C is set to 0, when the overdrive detection signal A and the forward detection signal B are in a saturation region, the overdrive detection signal A and the forward detection signal B are continuously increased, and the value of the differential quantity C is also increased;
when the value of the difference C is smaller than or equal to a preset difference threshold, the control and protection adjusting unit adjusts the attenuation of the voltage-controlled attenuation adjusting unit according to the value of the difference C, and adjusts the input signal, so that the value of the difference C is reduced;
when the difference value C is larger than a preset difference value threshold, the alarm power-off unit gives an alarm and cuts off the power supply of the power amplifier, and the protection of the output power of the frequency point in the frequency band is completed.
The beneficial effects are that: the invention relates to a signal automatic regulating device for overload prevention of a power amplification system and a regulating method thereof, wherein a signal is transmitted to a power divider through a voltage-controlled attenuation regulating unit, the signal is divided into two paths through the power divider, one path of the signal is input into a first detection chip, the input signal is processed through the first detection chip and then output an overdrive detection signal, the other path of the signal is input into a second detection chip through a power amplifier and a coupler, the input signal is processed through the second detection chip and then output a forward detection signal, the overdrive detection signal and the forward detection signal are received by a control and protection regulating unit, the control and protection regulating unit is used for carrying out integral and differential operation on the overdrive detection signal and the forward detection signal to obtain differential value, the calculated differential value is compared with a preset threshold value, and the attenuation value of the voltage-controlled attenuation regulating unit is regulated by a control and regulation unit according to the comparison result, so that the damage of the power amplification system caused by overlarge input is protected;
secondly, the overdrive detection signal and the forward detection signal are measured at the same frequency point, and all the frequency points can be protected, so that the problem of incomplete protection of the frequency points caused by frequency point switching of the power amplification system is avoided, and the safety of the power amplification system is improved.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a circuit diagram of an alarm power-off unit according to the present invention;
fig. 3 is a circuit diagram of a voltage controlled attenuation adjustment unit according to the present invention.
Detailed Description
As shown in fig. 1 to 3, an overload signal prevention automatic regulating device of a power amplification system comprises a voltage-controlled attenuation regulating unit, a power divider, a first detection chip, a power amplifier, a coupler, a second detection chip, a control and protection regulating unit and an alarm power-off unit, wherein the input end of the voltage-controlled attenuation regulating unit is connected with the output end of a radio frequency input, the voltage-controlled attenuation regulating unit is used for regulating an input signal, the signal output end of the voltage-controlled attenuation regulating unit is connected with the signal input end of the power divider, the signal output end of the power divider is simultaneously connected with the signal input end of the first detection chip and the signal input end of the power amplifier, the signal output end of the power amplifier is connected with the signal input end of the coupler, and the signal output end of the coupler is connected with the input end of the second detection chip and the radio frequency output port; the power divider is connected with the first detection chip to output an overdrive detection signal, the coupler is connected with the second detection chip to output a forward detection signal, the signal input end of the control and protection regulating unit is connected with the output ends of the first detection chip and the second detection chip, the signal output end of the control and protection regulating unit is connected with the voltage-controlled attenuation regulating unit in a control manner, the control and protection regulating unit is used for receiving the overdrive detection signal output by the first detection chip and the forward detection signal output by the second detection chip, performing differential operation on the overdrive detection signal and the forward detection signal to obtain corresponding differential quantity, regulating the attenuation quantity of the voltage-controlled attenuation regulating unit based on the differential quantity, the signal input end of the alarm power-off unit is connected with the signal output end of the control and protection regulating unit, the alarm power-off unit is connected with the power supply end of the power amplifier in a control manner, the signal is transmitted to the power divider through the voltage-controlled attenuation adjusting unit, the signal is divided into two paths through the power divider, one path is input into the detection chip, after the input signal is processed through the detection chip, the sine wave of the radio frequency is filtered into a smooth direct current signal, the smooth direct current signal is output, the other path is input into the detection chip through the power amplifier and the coupler, after the input signal is processed through the detection chip, the coupling signal is obtained through the detection chip, the smooth direct current signal is output, the forward detection signal is output, in the embodiment, the overdrive detection signal and the forward detection signal are in a linear growth state in an unsaturated zone, the overdrive detection signal and the forward detection signal are received by the control and protection adjusting unit, the overdrive detection signal and the forward detection signal are converted into digital signals through the AD7173 analog-digital conversion chip in the control and protection adjusting unit, the overdrive detection signal and the forward detection signal are continuously increased along with the input digital signal, the overdrive detection signal and the forward detection signal synchronously become larger, the control and protection adjusting unit synchronously records the integral quantity of the overdrive detection signal and the forward detection signal, calculates the differential quantity between the integral quantity of the overdrive detection signal and the integral quantity of the forward detection signal, compares the calculated differential quantity with a preset threshold value, and controls the attenuation quantity of the voltage-controlled attenuation adjusting unit to adjust according to the comparison result, or transmits the control and protection adjusting unit signal to the alarm power-off unit, and under the control of the alarm power-off unit, the power amplifier is controlled to be on-off, so that the damage caused by the overlarge input signal of the power amplifier is effectively avoided, and secondly, the overdrive detection signal and the forward detection signal are measured at the same frequency point, so that all the frequency points can be protected, the power amplifier system can not cause the problem of incomplete protection of the frequency points due to the switching of the frequency points, and the safety of the power amplifier system is improved.
In a further embodiment, the differential operation is as follows:
when the signal is in the linear region of the power amplifier, the input signal is increased by 1dB, the output signal is also increased by 1dB, and at the moment, the signal input and the signal output are synchronously changed, namely the differential quantity is not changed, and the control and protection adjusting unit does not have protection action;
when the signal is in the saturation region of the power amplifier, the input signal is increased by 1dB, the variation of the output signal is less than 1dB until the input signal is increased again, the output signal is unchanged, the power amplifier enters deep saturation, and the numerical value of the difference quantity of the signal input and the signal output is gradually increased at the moment;
the differential component threshold value is preset, the calculated differential component is compared with the preset differential component threshold value, and according to the comparison result, the control and protection regulating unit sends corresponding signals to the voltage-controlled attenuation regulating unit or the alarm power-off unit, and the attenuation regulating unit is controlled to regulate the attenuation of the voltage-controlled attenuation regulating unit or the alarm power-off unit is matched to control the power on and off of the power amplifier.
In a further embodiment, as shown in fig. 3, the voltage-controlled attenuation adjustment unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a variable resistor VR1, a capacitor C2, a capacitor C3, an amplifier U1, an amplifier U2, and a chip U3, where the amplifier U1 and the amplifier U2 are all ADA4891-2 type amplifiers, the chip U3 is RFSA2113 type chips, the resistor R1 is connected in parallel with the capacitor C1, one end of the resistor R1 is connected with a signal input terminal, the other end of the resistor R1 is connected with a pin 5 of the amplifier U2, a pin 8 of the amplifier U2 is connected with an external power supply, a pin 4 of the amplifier U2 is grounded, a pin 7 of the amplifier U2 is simultaneously connected with the resistor R2 and a pin 6 of the amplifier U2, the other end of the resistor R2 is simultaneously electrically connected with the pin 3 of the amplifier U1, pin 2 of the amplifier U1 is connected with a resistor R5, pin 1 of the amplifier U1 is electrically connected with a resistor R6, a resistor R3 and a capacitor C2 at the same time, the other end of the resistor R5 is electrically connected with the other end of the resistor R6 and the pin 3 of the variable resistor VR1 at the same time, the other end of the resistor R4 is connected with the pin 1 of the variable resistor VR1 and grounded, pin 2 of the variable resistor VR1 is connected with a resistor R7, the other end of the resistor R7 is connected with an external power supply, the other end of the resistor R3 is electrically connected with the capacitor C3 and the pin 15 of the chip U3 at the same time, the other end of the capacitor C2 is connected with the other end of the capacitor C3 and grounded, the pin 1 of the chip U3 and the pin 2 and the pin 16 of the chip U3 are connected with the pin 4 of the chip U3 and the pin 5, the pin 6, the pin 7 and the pin 8 of the chip U3 are grounded, the pin 12 of the chip U3 is connected with the pin 11 of the chip U3 and the ground, the AD7173 analog-to-digital conversion chip in the control and protection adjusting unit converts the overdrive detection signal and the forward detection signal into digital signals, the converted digital signals continuously change along with the continuous change of the overdrive detection signal and the forward detection signal, the control and protection adjusting unit synchronously excites the integral quantity of the overdrive detection signal and the forward detection signal, calculates the differential quantity between the integral quantities, compares the calculated differential quantity with a preset threshold value, and controls the circuit to adjust the attenuation quantity by using the control and adjustment unit according to the comparison result so as to achieve signal input balance and realize the protection of the power amplifier.
In a further embodiment, as shown in fig. 2, the alarm power-off unit includes a resistor R8, a resistor R9, a field-effect transistor Q1 and a triode Q2, the field-effect transistor Q1 is a MOSFET-P type field-effect transistor, the triode Q2 is a BC847x type triode, one end of the resistor R9 is connected to the control end, the other end of the resistor R9 is connected to the base of the triode Q2, the emitter of the triode Q2 is grounded, the collector of the triode Q2 is simultaneously connected to the resistor R8 and the gate of the field-effect transistor Q1, the other end of the resistor R8 is connected to the drain of the field-effect transistor Q1 and to the voltage input end, and the source of the field-effect transistor Q1 is connected to the voltage output end.
An overload-prevention automatic adjusting method for a power amplifier system comprises the following steps:
the method comprises the steps that firstly, an overdriving detection signal and a forward detection signal which are output by a detection chip I are both in a linear increasing area, a signal input end of a voltage-controlled attenuation adjusting unit is connected with a radio frequency input port, a signal output end of the voltage-controlled attenuation adjusting unit is connected with a signal input end of a power divider, a signal output end of the power divider is simultaneously connected with an input end of the detection chip I and a signal input end of a power amplifier, a signal output end of the power amplifier is connected with a signal input end of a coupler, the signal output end of the coupler is connected with an input end of a detection chip II and a radio frequency output port, the power divider is connected with the detection chip I to output an overdriving detection signal, the coupler is connected with the detection chip II to output a forward detection signal, a signal input end of the voltage-controlled attenuation adjusting unit is connected with the output end of the detection chip I and the detection chip II, the signal output end of the voltage-controlled attenuation adjusting unit is controlled to be connected with the voltage-controlled attenuation adjusting unit, and when the overdriving signal and the forward detection signal are in an unsaturated zone, the overdriving signal and the forward detection signal are connected with the voltage-controlled difference adjusting unit to perform an operation, and the forward signal attenuation adjusting unit is correspondingly connected with the overdriving signal output end of the detection unit;
the differential component threshold is preset, the differential component threshold is a fixed value, the differential component obtained by differential operation is compared with the differential component threshold, the attenuation of the voltage-controlled attenuation adjusting unit is adjusted in real time according to the comparison result or a signal is sent to the alarm power-off unit, the power amplifier is controlled to be powered off through the alarm power-off unit, and the protection of the output power of the frequency point in the frequency band is completed.
In a further embodiment, the overdrive detection signal obtained by the control and protection adjusting unit is denoted as a, the obtained forward detection signal is denoted as B, and the differential value obtained by integrating and differentiating the overdrive detection signal and the forward detection signal is denoted as C;
when the overdrive detection signal A and the forward detection signal B are in a linear amplification region, the value of the differential quantity C is set to 0 (the theoretical differential quantity C is 0), when the overdrive detection signal A and the forward detection signal B are in a saturation region, the overdrive detection signal A and the forward detection signal B are continuously increased, and the differential quantity C is also increased;
when the value of the difference C is smaller than or equal to a preset difference threshold, the control and protection adjusting unit adjusts the attenuation of the voltage-controlled attenuation adjusting unit according to the value of the difference C, and adjusts the input signal, so that the value of the difference C is reduced;
when the difference value C is larger than a preset difference value threshold, the alarm power-off unit gives an alarm and cuts off the power supply of the power amplifier, and the protection of the output power of the frequency point in the frequency band is completed.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (8)
1. An overload signal prevention automatic regulating apparatus for a power amplifier system, comprising:
the voltage-controlled attenuation adjusting unit is used for adjusting an input signal; the signal output end of the voltage-controlled attenuation adjusting unit is connected with the signal input end of the power divider, the signal output end of the power divider is simultaneously connected with the input end of the first detection chip and the signal input end of the power amplifier, the signal output end of the power amplifier is connected with the signal input end of the coupler, and the signal output end of the coupler is connected with the input end of the second detection chip and the radio frequency output port; the power divider is connected with the first detection chip to output an overdriving detection signal, and the coupler is connected with the second detection chip to output a forward detection signal;
the signal input end of the control protection adjusting unit is connected with the output ends of the first detection chip and the second detection chip, the signal output end of the control protection adjusting unit is in control connection with the voltage-controlled attenuation adjusting unit, and the control protection adjusting unit is used for receiving the overdrive detection signal output by the first detection chip and the forward detection signal output by the second detection chip, and performing differential operation on the overdrive detection signal and the forward detection signal to obtain corresponding differential quantity;
the signal input end of the alarm power-off unit is connected with the signal output end of the control and protection adjusting unit, and the alarm power-off unit is controlled and connected with a power supply of the power amplifier;
wherein the voltage-controlled attenuation adjusting unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a variable resistor VR1, a capacitor C2, a capacitor C3, an amplifier U1, an amplifier U2 and a chip U3, wherein the resistor R1 is connected with the capacitor C1 in parallel, one end of the resistor R1 is connected with a signal input end, the other end of the resistor R1 is connected with a pin 5 of the amplifier U2, a pin 8 of the amplifier U2 is connected with an external power supply, a pin 4 of the amplifier U2 is grounded, a pin 7 of the amplifier U2 is simultaneously connected with the resistor R2 and a pin 6 of the amplifier U2, the other end of the resistor R2 is simultaneously electrically connected with the resistor R4 and the pin 3 of the amplifier U1, a pin 2 of the amplifier U1 is connected with the resistor R5, the pin 1 of the amplifier U1 is electrically connected with the resistor R6, the resistor R3 and the capacitor C2 at the same time, the other end of the resistor R5 is electrically connected with the other end of the resistor R6 and the pin 3 of the variable resistor VR1 at the same time, the other end of the resistor R4 is connected with the pin 1 of the variable resistor VR1 and grounded, the pin 2 of the variable resistor VR1 is connected with the resistor R7, the other end of the resistor R7 is connected with an external power supply, the other end of the resistor R3 is electrically connected with the capacitor C3 and the pin 15 of the chip U3 at the same time, the other end of the capacitor C2 is connected with the other end of the capacitor C3 and grounded, the pin 14 of the chip U3 is connected with the external power supply, the pin 1 of the chip U3 is connected with the pin 2 of the chip U3, the pin 16 of the chip U3 is grounded, the pin 4 of the chip U3 is connected with the pin 5 of the chip U3, the pin 6, the pin 7 and the pin 8 of the chip U3 is grounded, and the pin 11 of the chip U3 is grounded.
2. The automatic overload signal adjusting device for a power amplifier system according to claim 1, wherein the differential operation mode is as follows:
when the signal is in the linear region of the power amplifier, the input signal is increased by 1dB, the output signal is also increased by 1dB, and at the moment, the signal input and the signal output are synchronously changed, namely the differential quantity is not changed, and the control and protection adjusting unit does not have protection action;
when the signal is in the saturation region of the power amplifier, the input signal is increased by 1dB, the variation of the output signal is less than 1dB until the input signal is increased again, the output signal is unchanged, the power amplifier enters deep saturation, and the numerical value of the difference quantity of the signal input and the signal output is gradually increased at the moment;
the differential component threshold value is preset, the calculated differential component is compared with the preset differential component threshold value, and according to the comparison result, the control and protection regulating unit sends corresponding signals to the voltage-controlled attenuation regulating unit or the alarm power-off unit, and the attenuation regulating unit is controlled to regulate the attenuation of the voltage-controlled attenuation regulating unit or the alarm power-off unit is matched to control the power on and off of the power amplifier.
3. The automatic overload signal adjusting device for the power amplification system according to claim 1, wherein the amplifier U1 and the amplifier U2 are respectively an ADA4891-2 type amplifier, and the chip U3 is an RFSA2113 type chip.
4. The automatic overload signal adjusting device for the power amplification system according to claim 1, wherein the alarm power-off unit comprises a resistor R8, a resistor R9, a field effect transistor Q1 and a triode Q2, one end of the resistor R9 is connected to the control end, the other end of the resistor R9 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is grounded, the collector electrode of the triode Q2 is simultaneously connected with the resistor R8 and the grid electrode of the field effect transistor Q1, the other end of the resistor R8 is connected with the drain electrode of the field effect transistor Q1 and is connected with the voltage input end, and the source electrode of the field effect transistor Q1 is connected with the voltage output end.
5. The device for automatically adjusting overload prevention signals of a power amplifier system according to claim 4, wherein the field effect transistor Q1 is a MOSFET-P type field effect transistor.
6. The device for automatically adjusting overload prevention signals of a power amplifier system according to claim 4, wherein said transistor Q2 is a BC847x type transistor.
7. An automatic adjusting method for overload prevention of a power amplifier system, which is realized by the automatic adjusting device for overload prevention signals of the power amplifier system according to claim 1, is characterized by comprising the following steps:
step S1, a signal input end of the voltage-controlled attenuation adjusting unit is connected with a radio frequency input port, a signal output end of the voltage-controlled attenuation adjusting unit is connected with a signal input end of a power divider, a signal output end of the power divider is respectively connected with a signal input end of a power amplifier and a signal input end of a detection chip I, a signal output end of the power amplifier is connected with a signal input end of a coupler, a signal output end of the coupler is respectively connected with a signal input end of a detection chip II and a radio frequency output port, a signal output end of the control and protection adjusting unit is connected with a signal input end of the voltage-controlled attenuation adjusting unit and a signal input end of an alarm power-off unit, and the alarm power-off control is connected with a power supply of the power amplifier;
s2, dividing a signal output by the voltage-controlled attenuation adjusting unit into two paths of signals after passing through the power divider, wherein one path of signal enters the first detection chip and then outputs an overdriving detection signal, and the other path of signal enters the second detection chip through the power amplifier and the coupler and then outputs a forward detection signal, and when the overdriving detection signal and the forward detection signal are in an unsaturated zone, the overdriving detection signal and the forward detection signal are both in a linear growth zone;
step S3, the control and protection adjusting unit receives the overdrive detection signal output by the first detection chip and the forward detection signal output by the second detection chip in the step S2, and performs differential operation on the overdrive detection signal and the forward detection signal to obtain differential values of the overdrive detection signal and the forward detection signal;
and S4, presetting a differential component threshold, wherein the differential component threshold is a fixed value, comparing the differential component in the step S3 with the differential component threshold, and adjusting the attenuation of the voltage-controlled attenuation adjusting unit in real time or sending a signal to the alarm power-off unit according to the comparison result, and controlling the power amplifier to power off through the alarm power-off unit to finish the protection of the output power of the frequency point in the frequency band.
8. The automatic overload prevention adjustment method of the power amplifier system according to claim 7, wherein the overdrive detection signal in the step S2 is denoted as a, the forward detection signal in the step S2 is denoted as B, and the differential component in the step S3 is denoted as C;
when the overdrive detection signal A and the forward detection signal B are in a linear amplification region, the value of the differential quantity C is set to 0, when the overdrive detection signal A and the forward detection signal B are in a saturation region, the overdrive detection signal A and the forward detection signal B are continuously increased, and the value of the differential quantity C is also increased;
when the value of the difference C is smaller than or equal to a preset difference threshold, the control and protection adjusting unit adjusts the attenuation of the voltage-controlled attenuation adjusting unit according to the value of the difference C, and adjusts the input signal, so that the value of the difference C is reduced;
when the difference value C is larger than a preset difference value threshold, the alarm power-off unit gives an alarm and cuts off the power supply of the power amplifier, and the protection of the output power of the frequency point in the frequency band is completed.
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