CN105024657A - Power amplifier protection method and system - Google Patents
Power amplifier protection method and system Download PDFInfo
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- CN105024657A CN105024657A CN201410183068.8A CN201410183068A CN105024657A CN 105024657 A CN105024657 A CN 105024657A CN 201410183068 A CN201410183068 A CN 201410183068A CN 105024657 A CN105024657 A CN 105024657A
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Abstract
The invention discloses a power amplifier protection method and system. The system comprises a delay circuit, a detection circuit, a comparison circuit and a power amplifier protection circuit. The delay circuit is connected with a signal input end of the power amplifier protection circuit. A first input end of the comparison circuit is connected with an output end of the detection circuit. A second input end of the comparison circuit is used for receiving a reference voltage. An output end of the comparison circuit is connected with a control end of the power amplifier protection circuit. The delay circuit receives a radio frequency input signal and sends the delayed radio frequency input signal to the power amplifier protection circuit. The detection circuit receives the radio frequency input signal and converts the peak power of the radio frequency input signal into a detection voltage. The power amplifier protection circuit receives a control level through the control end of the power amplifier protection circuit and correspondingly controls the radio frequency input signal under the control of the control level. Through adoption of the method and system, an instantaneous high power pulse abnormal signal can be prevented from damaging a power amplifier device.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of power amplification protecting method and system.
Background technology
RF power amplifying device is commonly used to increase signal transmission power in mobile communications industry, spread signal coverage.Along with the development of mobile communication standard, the bandwidth of application signal becomes wider, peak-to-average force ratio also becomes higher, and operational environment is more complicated and be difficult to prediction.Therefore, power amplification device occurs that the record damaged also more comes also large.
Usually the reason causing power amplification device to damage is containing high-power abnormal signal in the input signal of power amplifier input, such as: the pulse signal of lasting high-power signal, transient high power or band stray etc.
Conventional power amplification protecting method is that these guard methods all can be realized by hardware detecting circuit and software controlled circuitry usually by carrying out current limliting, input power detection, power output detection to power amplifier, automatically controlling the peak power output (ALC) of power amplifier, automatically adjusting the gain (AGC) of power amplifier.
But above-mentioned power amplification protecting method lacks protection to the highpowerpulse abnormal input signal of moment, power amplification device is easily caused to occur damaging.
Summary of the invention
Based on this, be necessary to lack protection for above-mentioned power amplification protecting method to the highpowerpulse abnormal input signal of moment, easily cause power amplification device to occur the problem damaged, a kind of power amplification protecting method and system are provided.
A kind of power amplifier protection system, comprise delay circuit, testing circuit, comparison circuit and power amplifier protective circuit, described delay circuit is connected with the signal input part of described power amplifier protective circuit, the first input end of described comparison circuit is connected with the output of described testing circuit, second input is for receiving reference voltage, output is connected with the control end of described power amplifier protective circuit, described delay circuit received RF input signal, and the described radio-frequency input signals after time delay is sent to described power amplifier protective circuit, described testing circuit receives described radio-frequency input signals, and the peak power of described radio-frequency input signals is converted to detection voltage, described power amplifier protective circuit receives control level by its control end, and under the control of described control level, corresponding control is carried out to described radio-frequency input signals.
Based on a power amplification protecting method for above-mentioned power amplifier protection system, comprise the following steps:
By described delay circuit, time delay is carried out to described radio-frequency input signals, and the described radio-frequency input signals after time delay is sent to described power amplifier protective circuit;
Detected the peak power of described radio-frequency input signals by described testing circuit, and the peak power of detection is converted to detection voltage;
By described comparison circuit more described detection voltage and described reference voltage, when described detection voltage is greater than described reference voltage, send low level to described power amplifier protective circuit;
Under described low level control, by described power amplifier protective circuit, shutoff is carried out to described radio-frequency input signals and control.
Above-mentioned power amplifier protection system and method; by delay circuit, testing circuit, comparison circuit and power amplifier protective circuit; by detecting the peak power of input signal; and according to the size of peak power; transmit control signal in time; carry out correspondence in time to the input signal of time delay to control; can when input signal be the highpowerpulse abnormal signal of moment; carry out shutoff according to its peak power to it in time to control; prevent highpowerpulse abnormal signal instantaneously from, to the damage of power amplifying device, ensureing the reliability of power amplifying device.
Accompanying drawing explanation
Fig. 1 and Fig. 2 is the structural representation of power amplifier protection system first execution mode of the present invention;
Fig. 3 is the structural representation of power amplifier protection system second execution mode of the present invention;
Fig. 4 is the schematic flow sheet of power amplification protecting method first execution mode of the present invention;
Fig. 5 is the schematic flow sheet of power amplification protecting method second execution mode of the present invention.
Embodiment
Refer to Fig. 1 and Fig. 2, Fig. 1 and Fig. 2 is the structural representation of power amplifier protection system first execution mode of the present invention.
The described power amplifier protection system of present embodiment comprises delay circuit 100, testing circuit 200, comparison circuit 300 and power amplifier protective circuit 400, delay circuit 100 is connected with the signal input part of power amplifier protective circuit 400, the first input end of comparison circuit 300 is connected with the output of testing circuit 200, second input is for receiving reference voltage, output is connected with the control end of power amplifier protective circuit 400, delay circuit 100 received RF input signal, and the described radio-frequency input signals after time delay is sent to power amplifier protective circuit 400, testing circuit 200 received RF input signal, and the peak power of described radio-frequency input signals is converted to detection voltage, power amplifier protective circuit 400 receives control level by its control end, and under the control of described control level, corresponding control is carried out to described radio-frequency input signals.
Power amplifier protection system described in present embodiment; by delay circuit, testing circuit, comparison circuit and power amplifier protective circuit; by detecting the peak power of input signal; and according to the size of peak power; transmit control signal in time; carry out correspondence in time to the input signal of time delay to control; can when input signal be the highpowerpulse abnormal signal of moment; carry out shutoff according to its peak power to it in time to control; prevent highpowerpulse abnormal signal instantaneously from, to the damage of power amplifying device, ensureing the reliability of power amplifying device.
Wherein, for delay circuit 100; preferably; the described radio-frequency input signals time delay Preset Time backward that delay circuit 100 will receive according to delay threshold, the setting of described delay threshold arrives the time of described power amplifier protective circuit for making the time of starting to control of described power amplifier protective circuit early than described radio-frequency input signals.
Preferably, the input signal of power amplifying device to be entered can be carried out two signals of RF-coupled rear generation, one is the first RF-coupled signal, can input time delay circuit 100, and another is the second RF-coupled signal, can input detecting circuit 200.
Preferably, delay circuit 100 can comprise delayer, the input of described delayer for receiving described radio-frequency input signals, output is connected with the input of power amplifier protective circuit 400.
In one embodiment; delay circuit 100 can comprise filtering wave by prolonging time device; the input of described filtering delay-time device for receiving described radio-frequency input signals, output is connected with the input of power amplifier protective circuit 400, described filtering wave by prolonging time device receives described radio-frequency input signals, described radio-frequency input signals is carried out to bandpass filtering, carries out time delay and the described radio-frequency input signals after time delay is sent to power amplifier protective circuit 400 to filtered described radio-frequency input signals.
Wherein, can by the interference signal filtering outside the working frequency range band of power amplifying device by bandpass filtering.
In another embodiment; delay circuit 100 can comprise filter and delayer; the input of described filter for receiving described radio-frequency input signals, output is connected with the input of described delayer; the output of described delayer is connected with the input of power amplifier protective circuit 400; described filter carries out bandpass filtering to described radio-frequency input signals, and described delay circuit carries out time delay to filtered described radio-frequency input signals.
For testing circuit 200, preferably, peak detection pipe can be comprised, the peak power of signal is obtained by detecting described radio-frequency input signals, and peak power is converted to detection voltage, peak power is directly proportional to detection voltage, can judge described radio-frequency input signals whether as abnormal signal by detecting the size of voltage.
Preferably; power amplifier protection system of the present invention also can comprise radio-frequency (RF) coupler, the input of described radio-frequency (RF) coupler for receiving described input signal, the first output is connected with the input of delay circuit 100, the second output is connected with the input of testing circuit 200.
For comparison circuit 300; preferably; the detection voltage of reception and the reference voltage preset are compared; when described detection voltage is greater than default reference voltage; a low level is sent to power amplifier protective circuit 400; control power amplifier protective circuit 400 with maximum power attenuation amount (as 40dB) to as described in radio-frequency input signals decay, in case described radio-frequency input signals destroys power amplifying device.When described detection voltage is not more than default reference voltage; a high level is sent to power amplifier protective circuit 400; control power amplifier protective circuit 400 to decay to described radio-frequency input signals with less power attenuation amount (3dB), decaying almost does not affect described radio-frequency input signals.
Preferably, comparison circuit 300 can comprise comparator, the first input end of described comparator is connected with the output of described testing circuit, the second input for receiving reference voltage, output is connected with power amplifier protective circuit 400.
For power amplifier protective circuit 400; preferably; under the control of control level, carry out shutoff to described radio-frequency input signals in real time control or path control; described shutoff controls to comprise the path cut off between power amplifier protective circuit 400 and power amplifying device; make described radio-frequency input signals cannot input described power amplifying device, or by described first RF-coupled power attenuation to safe range.
In one embodiment; power amplifier protective circuit 400 can comprise the power amplifier switch for blocking described radio-frequency input signals or open, and the input of described power amplifier switch is connected with the output of described delay circuit, control end is connected with the output of described comparison circuit, output is used for being connected with the signal input part of described power amplifying device.
In another embodiment; power amplifier protective circuit 400 comprises ATT attenuator circuit, and the input of described ATT attenuator circuit is connected with the output of described delay circuit, control end is connected with the output of described comparison circuit, output is used for being connected with the signal input part of described power amplifying device.
As shown in Figure 2, power amplifier protective circuit 400 can comprise the ATT attenuator circuit be made up of attenuation diode Z1, decay diode Z2, electric capacity C1-C4, resistance R1-R5, can carry out rapid decay to described radio-frequency input signals.
Referring to Fig. 3, is the structural representation of power amplifier protection system second execution mode of the present invention shown in Fig. 3.
Power amplifier protection system described in present embodiment and the difference of the first execution mode are: comparison circuit 300 comprises hysteresis comparator 310, the first input end of hysteresis comparator 310 is connected with the output of testing circuit 200, the second input for receiving reference voltage, output is connected with power amplifier protective circuit 400.
Present embodiment, by the more described detection voltage of hysteresis comparator and reference voltage, can export control level fast, reduces the response speed of comparison circuit, and that shortens power amplifier protective circuit starts to control the time.
Wherein, hysteresis comparator 310 compares detecting voltage with the reference voltage Vref preset, two threshold value UH and UL of hysteresis comparator can be determined by Vcc and R1, R2 and Vref, as shown in Figure 2, in conjunction with actual service condition, the comparison threshold of a suitable hysteresis comparator is set by the value arranging above-mentioned parameter.
By the setting of Vcc, Vref and R1, R2, choose suitable UH and HL value, detect voltage ratio UL large and lower than UH time, hysteresis comparator exports a high level.When detecting voltage and being low unlike UH, hysteresis comparator exports a low level.
Refer to Fig. 4, Fig. 4 is the schematic flow sheet of power amplification protecting method first execution mode of the present invention.
The described power amplification protecting method of present embodiment comprises the following steps:
Step 401, carries out time delay by described delay circuit to described radio-frequency input signals, and the described radio-frequency input signals after time delay is sent to described power amplifier protective circuit.
Step 402, detects the peak power of described radio-frequency input signals by described testing circuit, and the peak power of detection is converted to detection voltage.
Step 403, by described comparison circuit more described detection voltage and described reference voltage, when described detection voltage is greater than described reference voltage, sends described low level to described power amplifier protective circuit.
Step 404, under described low level control, carries out shutoff by described power amplifier protective circuit to described radio-frequency input signals and controls.
Power amplification protecting method described in present embodiment; by delay circuit, testing circuit, comparison circuit and power amplifier protective circuit; by detecting the peak power of input signal; and according to the size of peak power; transmit control signal in time; carry out correspondence in time to the input signal of time delay to control; can when input signal be the highpowerpulse abnormal signal of moment; carry out shutoff according to its peak power to it in time to control; prevent highpowerpulse abnormal signal instantaneously from, to the damage of power amplifying device, ensureing the reliability of power amplifying device.
Wherein, the power amplification protecting method of present embodiment is protected power amplifying device based on the power amplifier protection system shown in Fig. 1-3.
In one embodiment, described under the control of described high level, by described power amplifier protective circuit, described radio-frequency input signals is carried out turning off the step controlled and comprise the following steps:
Under the control of described high level, with the maximum power attenuation amount of described ATT attenuator circuit, power attenuation is carried out to described radio-frequency input signals.
Referring to Fig. 5, is the schematic flow sheet of power amplification protecting method second execution mode of the present invention shown in Fig. 5.
Power amplification protecting method described in present embodiment is with the difference of the first execution mode: described by described comparison circuit more described detection voltage and described reference voltage; when described detection voltage is greater than described reference voltage, send described low level step to described power amplifier protective circuit further comprising the steps of:
Step 501, when described detection voltage is greater than the first threshold voltage of described hysteresis comparator and is less than the second threshold voltage of described hysteresis comparator, sends high level by described comparison circuit to described power amplifier protective circuit.
Step 502, when described detection voltage is not less than described second threshold voltage, sends described low level by described comparison circuit to described power amplifier protective circuit.
The described power amplification protecting method of present embodiment, by the more described detection voltage of hysteresis comparator and reference voltage, can export control level fast, reduces the response speed of comparison circuit, and that shortens power amplifier protective circuit starts to control the time.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (13)
1. a power amplifier protection system, it is characterized in that, comprise delay circuit, testing circuit, comparison circuit and power amplifier protective circuit, described delay circuit is connected with the signal input part of described power amplifier protective circuit, the first input end of described comparison circuit is connected with the output of described testing circuit, second input is for receiving reference voltage, output is connected with the control end of described power amplifier protective circuit, described delay circuit received RF input signal, and the described radio-frequency input signals after time delay is sent to described power amplifier protective circuit, described testing circuit receives and penetrates described radio-frequency input signals, and the peak power of described radio-frequency input signals is converted to detection voltage, described power amplifier protective circuit receives control level by its control end, and under the control of described control level, corresponding control is carried out to described radio-frequency input signals.
2. power amplifier protection system according to claim 1, is characterized in that, described delay circuit comprises delayer, and the input of described delayer is for receiving described radio-frequency input signals, and output is connected with the input of described power amplifier protective circuit.
3. according to the power amplifier protection system that claim 1 is stated; it is characterized in that; described delay circuit comprises filtering wave by prolonging time device; the input of described filtering delay-time device is for receiving described radio-frequency input signals; output is connected with the input of described power amplifier protective circuit; described filtering wave by prolonging time device receives described radio-frequency input signals; bandpass filtering is carried out to described radio-frequency input signals; time delay is carried out to filtered described radio-frequency input signals, and the described radio-frequency input signals after time delay is sent to described power amplifier protective circuit.
4. power amplifier protection system according to claim 1; it is characterized in that; described delay circuit comprises filter and delayer; the input of described filter is for receiving described radio-frequency input signals; output is connected with the input of described delayer; the output of described delayer is connected with the input of described power amplifier protective circuit, and described filter carries out bandpass filtering to described radio-frequency input signals, and described delay circuit carries out time delay to filtered described radio-frequency input signals.
5. power amplifier protection system according to claim 1; it is characterized in that; described power amplifier protective circuit comprises carries out for described radio-frequency input signals the power amplifier switch that blocks or open; the input of described power amplifier switch is connected with the output of described delay circuit, and control end is connected with the output of described comparison circuit, output is used for being connected with the signal input part of described power amplifying device.
6. power amplifier protection system according to claim 1; it is characterized in that; described power amplifier protective circuit comprises ATT attenuator circuit, and the input of described ATT attenuator circuit is connected with the output of described delay circuit, control end is connected with the output of described comparison circuit, output is used for being connected with the signal input part of described power amplifying device.
7. power amplifier protection system according to claim 1, is characterized in that, described testing circuit comprises peak detection pipe.
8. power amplifier protection system according to claim 1; it is characterized in that; also comprise radio-frequency (RF) coupler; the input of described radio-frequency (RF) coupler is for receiving described input signal; first output is connected with the input of described delay circuit, and the second output is connected with the input of described testing circuit.
9. power amplifier protection system as claimed in any of claims 1 to 8; it is characterized in that; described comparison circuit comprises hysteresis comparator; the first input end of described hysteresis comparator is connected with the output of described testing circuit; second input is for receiving reference voltage, and output is connected with described power amplifier protective circuit.
10. power amplifier protection system as claimed in any of claims 1 to 8; it is characterized in that; described comparison circuit comprises comparator; the first input end of described comparator is connected with the output of described testing circuit; second input is for receiving reference voltage, and output is connected with described power amplifier protective circuit.
11. 1 kinds, based on the power amplification protecting method of the power amplifier protection system in claim 1 to 10 described in any one, is characterized in that, comprise the following steps:
By described delay circuit, time delay is carried out to described radio-frequency input signals, and the described radio-frequency input signals after time delay is sent to described power amplifier protective circuit;
Detected the peak power of described radio-frequency input signals by described testing circuit, and the peak power of detection is converted to detection voltage;
By described comparison circuit more described detection voltage and described reference voltage, when described detection voltage is greater than described reference voltage, send low level to described power amplifier protective circuit;
Under described low level control, by described power amplifier protective circuit, shutoff is carried out to described radio-frequency input signals and control.
12. power amplification protecting methods according to claim 11, is characterized in that, described under the control of described high level, carry out turning off the step controlled comprise the following steps by described power amplifier protective circuit to described radio-frequency input signals:
Under the control of described high level, with the maximum power attenuation amount of described ATT attenuator circuit, power attenuation is carried out to described radio-frequency input signals.
13. power amplification protecting methods according to claim 11 or 12; it is characterized in that; described by described comparison circuit more described detection voltage and described reference voltage; when described detection voltage is greater than described reference voltage, send low level step to described power amplifier protective circuit further comprising the steps of:
When described detection voltage is greater than the first threshold voltage of described hysteresis comparator and is less than the second threshold voltage of described hysteresis comparator, send high level by described comparison circuit to described power amplifier protective circuit;
When described detection voltage is not less than described second threshold voltage, send described low level by described comparison circuit to described power amplifier protective circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410183068.8A CN105024657A (en) | 2014-04-30 | 2014-04-30 | Power amplifier protection method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410183068.8A CN105024657A (en) | 2014-04-30 | 2014-04-30 | Power amplifier protection method and system |
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| CN105024657A true CN105024657A (en) | 2015-11-04 |
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| CN201410183068.8A Pending CN105024657A (en) | 2014-04-30 | 2014-04-30 | Power amplifier protection method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111934697A (en) * | 2020-08-04 | 2020-11-13 | 三维通信股份有限公司 | LTE (Long term evolution) system distributed relay system, uplink noise suppression method and computer equipment |
| CN117092441A (en) * | 2023-10-17 | 2023-11-21 | 南京纳特通信电子有限公司 | Abnormal impact signal detection method and system and electromagnetic compatibility test method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111934697A (en) * | 2020-08-04 | 2020-11-13 | 三维通信股份有限公司 | LTE (Long term evolution) system distributed relay system, uplink noise suppression method and computer equipment |
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Application publication date: 20151104 |