CN203747758U - Power amplifier standing wave protection circuit - Google Patents
Power amplifier standing wave protection circuit Download PDFInfo
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- CN203747758U CN203747758U CN201420130270.XU CN201420130270U CN203747758U CN 203747758 U CN203747758 U CN 203747758U CN 201420130270 U CN201420130270 U CN 201420130270U CN 203747758 U CN203747758 U CN 203747758U
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- 238000001514 detection method Methods 0.000 claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 230000009897 systematic effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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Abstract
The utility model discloses a power amplifier standing wave protection circuit. The power amplifier standing wave protection circuit comprises a signal comparison module, a protection unit and a temperature detection unit, wherein the signal comparison module comprises a first comparison unit and a second comparison unit, an input end of the first comparison unit is connected with a forward direction detection signal, two input ends of the second comparison unit are connected with a reverse direction detection signal and the forward direction detection signal respectively, and an output end of the first comparison unit and an output end of the second comparison unit are connected with two input ends of a first conjunction gate respectively. An output end of the first conjunction gate is connected with an input end of the protection unit, and signals output by the protection unit are systematic output signals. According to the power amplifier standing wave protection circuit, the method of diode wave detection is abandoned, a plurality of logic devices are adopted for standing wave detection, so that abnormal state can be responded to in time and normal operation of equipment is guaranteed.
Description
Technical field
The utility model relates to a kind of power amplifier standing-wave protecting circuit.
Background technology
Standing-wave ratio VSWR is the index for measuring radio circuit middle impedance mismatch.Standing-wave ratio is excessive will affect communication distance, reduces information transmission quality, and can cause radio circuit to occur a series of problem.The power amplifier that is positioned at antenna front end is that standing wave is worsened to the most responsive parts; reflection power turns back in power amplifier; the serious moment of situation causes high power amplifier permanent damage; conventionally being referred to as standing wave lost efficacy; in the time that this situation occurs, it is very important that high power amplifier is carried out to effectively protection.
Voltage and current along transmission line connects by certain certain ratio, and this certain ratio is referred to as characteristic impedance.In the time that power amplifier output is connected to the load equating with transmission characteristic impedance; radio-frequency (RF) energy will all be sent in load; and when impedance mismatching; incident wave voltage and the stack of reflected wave voltage; on transmission path, will produce voltage max and minimum value; in view of this, the problem of the measuring and protection of power amplifier standing-wave ratio finally can be summed up as the forward and reverse power detection of power amplifier output, and uses suitable circuit arrangement to realize the problem of power amplifier unit being implemented to protection.
Traditional detecting circuit utilizes diode halfwave rectifier characteristic to realize, diode detector with temperature-compensating can possess good performance in larger building under ripple input power condition, and in the time that input power reduces, its performance can sharply worsen, in addition, diode detection circuit working frequency band relative narrower can cause the deterioration of detection flatness in the time of the applications of broadband, causes the consistency of detection value within the scope of Whole frequency band to meet the demands.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art; a kind of power amplifier standing-wave protecting circuit is provided, has abandoned the method for diode detection, adopt multiple logical devices to detect standing wave; can react to abnormality in time, the normal operation of protection equipment.
The purpose of this utility model is achieved through the following technical solutions: a kind of power amplifier standing-wave protecting circuit; it comprises signal comparison module, protected location and temperature detecting unit; described signal comparison module comprises the first comparing unit and the second comparing unit; the input of the first comparing unit is connected with forward detection signal; two inputs of the second comparing unit are connected with inverse detection signal and forward detection signal respectively, and the output of the output of the first comparing unit and the second comparing unit is connected with two inputs of door with first respectively.First is connected with the output of door and the input of protected location, the output signal that the signal that protected location is exported is system.
Described a kind of power amplifier standing-wave protecting circuit also comprises temperature detecting unit, and the output of temperature detecting unit is connected with the input of door with second respectively with the output of protected location, second with the output of the door output that is system.
The first described comparing unit comprises the first comparator U1, the inverting input of the first comparator U1 is by resistance R 1 ground connection, in-phase input end is connected with forward detection signal by resistance R 2, positive power source terminal is connected with+5V level, negative power end ground connection, inverting input is connected to form feedback by resistance R 3 and resistance R 4 with output, and the output that is also parallel with capacitor C 1, the first comparator U1 between resistance R 3 and resistance R 4 is connected with an input of door U3 with first.
The second described comparing unit comprises the second comparator U2, the inverting input of the second comparator U2 is by resistance R 5 ground connection, inverting input is also connected with forward detection signal by resistance R 6, in-phase input end is connected with inverse detection signal by resistance R 7, positive power source terminal is connected with+5V level, and the output of the second comparator U2 is connected with another input of door U3 with first.
Described protected location comprise first or door U4, trigger U5, the 3rd with door a U6, second with door a U7, first or door U4 two inputs connect respectively first with door U3 output, high-power guard signal OP signal, output is connected with the CLK end of trigger, output is also by resistance R 9 ground connection, the V+ end of trigger and CLR end of oppisite phase are connected with+5V level, D holds ground connection, Q end is connected with an input of door U6 with the 3rd, the end of oppisite phase of PR is connected with another input of U6, the end of oppisite phase of PR is also by resistance R 10 ground connection, the 3rd is connected with an input of door U7 with second by resistance R 11 with the output of door U6, the output of temperature detecting unit is connected with another input of door U7 with second.
Described temperature detecting unit comprises hygrosensor U8, and+5V level is connected with output with hygrosensor U8 by resistance R 12 in turn, and output is by resistance R 13 ground connection, also by resistance C2 ground connection.
The beneficial effects of the utility model are:
(1) adopt pure hardware designs, dependable performance, powerful, to being swift in response of abnormality, reduce the damage probability of equipment.
(2) add temperature detecting function, can not only open-circuit and standing wave is excessive detects, can also detect temperature, further strengthen the defencive function of circuit.
Brief description of the drawings
Fig. 1 is the utility model structured flowchart;
Fig. 2 is signal comparison module circuit diagram;
Fig. 3 is protected location circuit diagram;
Fig. 4 is temperature detecting unit circuit diagram.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
As shown in Figure 1; a kind of power amplifier standing-wave protecting circuit; a kind of power amplifier standing-wave protecting circuit; it comprises signal comparison module, protected location and temperature detecting unit; described signal comparison module comprises the first comparing unit and the second comparing unit; the input of the first comparing unit is connected with forward detection signal; two inputs of the second comparing unit are connected with inverse detection signal and forward detection signal respectively, and the output of the output of the first comparing unit and the second comparing unit is connected with two inputs of door with first respectively.First is connected with the output of door and the input of protected location, the output signal that the signal that protected location is exported is system.
Described a kind of power amplifier standing-wave protecting circuit also comprises temperature detecting unit, and the output of temperature detecting unit is connected with the input of door with second respectively with the output of protected location, second with the output of the door output that is system.
As shown in Figure 2, the first described comparing unit comprises the first comparator U1, the inverting input of the first comparator U1 is by resistance R 1 ground connection, in-phase input end is connected with forward detection signal by resistance R 2, positive power source terminal is connected with+5V level, negative power end ground connection, and inverting input is connected to form feedback by resistance R 3 and resistance R 4 with output, the output that is also parallel with capacitor C 1, the first comparator U1 between resistance R 3 and resistance R 4 is connected with an input of door U3 with first.
The second described comparing unit comprises the second comparator U2, the inverting input of the second comparator U2 is by resistance R 5 ground connection, inverting input is also connected with forward detection signal by resistance R 6, in-phase input end is connected with inverse detection signal by resistance R 7, positive power source terminal is connected with+5V level, and the output of the second comparator U2 is connected with another input of door U3 with first.
As shown in Figure 3, described protected location comprise first or door U4, trigger U5, the 3rd with door a U6, second with door a U7, first or door U4 two inputs connect respectively first with door U3 output, high-power guard signal OP signal, output is connected with the CLK end of trigger, output is also by resistance R 9 ground connection, the V+ end of trigger and CLR end of oppisite phase are connected with+5V level, D holds ground connection, Q end is connected with an input of door U6 with the 3rd, the end of oppisite phase of PR is connected with another input of U6, the end of oppisite phase of PR is also by resistance R 10 ground connection, the 3rd is connected with an input of door U7 with second by resistance R 11 with the output of door U6, the output of temperature detecting unit is connected with another input of door U7 with second.
As shown in Figure 4, described temperature detecting unit comprises hygrosensor U8, and+5V level is connected with output with hygrosensor U8 by resistance R 12 in turn, and output is by resistance R 13 ground connection, also by resistance C2 ground connection.
The utility model course of work: in the time that power amplifier is normally worked, forward detection signal can be higher than the inverting input signal voltage of the first comparator, the first comparator output high level, but anti-phase detection signal can be higher than forward detection signal, so the second comparator output low level, finally synthetic signal OL is low level.
When power amplifier open circuit or standing wave are when excessive; anti-phase detection signal increases to the voltage that exceedes forward detection signal; the second comparator output high level; so synthetic OL signal is high level; this signal can move trigger protection unit; because OL signal is high level; want first or door defeated certainly for high level; institute so that trigger be triggered; Q holds output low level; thereby make the 3rd to be output as low level with a door U6, the output of this low level and temperature detecting unit enters second and behind the door, and the signal of output is final output signal PA.
The above is only preferred implementation of the present utility model, be to be understood that the utility model is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, amendment and environment, and can, in contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not depart from spirit and scope of the present utility model, all should be in the protection range of the utility model claims.
Claims (6)
1. a power amplifier standing-wave protecting circuit, it is characterized in that: it comprises signal comparison module, protected location and temperature detecting unit, described signal comparison module comprises the first comparing unit and the second comparing unit, the input of the first comparing unit is connected with forward detection signal, two inputs of the second comparing unit are connected with inverse detection signal and forward detection signal respectively, the output of the output of the first comparing unit and the second comparing unit is connected with two inputs of door with first respectively, first is connected with the output of door and the input of protected location, the signal that protected location is exported is the output signal of system.
2. a kind of power amplifier standing-wave protecting circuit according to claim 1; it is characterized in that: described a kind of power amplifier standing-wave protecting circuit also comprises temperature detecting unit; the output of temperature detecting unit is connected with the input of door with second respectively with the output of protected location, second with the output of the door output that is system.
3. a kind of power amplifier standing-wave protecting circuit according to claim 1; it is characterized in that: the first described comparing unit comprises the first comparator U1; the inverting input of the first comparator U1 is by resistance R 1 ground connection; in-phase input end is connected with forward detection signal by resistance R 2; positive power source terminal is connected with+5V level; negative power end ground connection; inverting input is connected to form feedback by resistance R 3 and resistance R 4 with output; the output that is also parallel with capacitor C 1, the first comparator U1 between resistance R 3 and resistance R 4 is connected with an input of door U3 with first.
4. a kind of power amplifier standing-wave protecting circuit according to claim 1; it is characterized in that: the second described comparing unit comprises the second comparator U2; the inverting input of the second comparator U2 is by resistance R 5 ground connection; inverting input is also connected with forward detection signal by resistance R 6; in-phase input end is connected with inverse detection signal by resistance R 7; positive power source terminal is connected with+5V level, and the output of the second comparator U2 is connected with another input of door U3 with first.
5. a kind of power amplifier standing-wave protecting circuit according to claim 1, it is characterized in that: described protected location comprise first or door U4, trigger U5, the 3rd with door a U6, second with door a U7, first or door U4 two inputs connect respectively first with door U3 output, high-power guard signal OP signal, output is connected with the CLK end of trigger, output is also by resistance R 9 ground connection, the V+ end of trigger and CLR end of oppisite phase are connected with+5V level, D holds ground connection, Q end is connected with an input of door U6 with the 3rd, the end of oppisite phase of PR is connected with another input of U6, the end of oppisite phase of PR is also by resistance R 10 ground connection, the 3rd is connected with an input of door U7 with second by resistance R 11 with the output of door U6, the output of temperature detecting unit is connected with another input of door U7 with second.
6. a kind of power amplifier standing-wave protecting circuit according to claim 1; it is characterized in that: described temperature detecting unit comprises hygrosensor U8; + 5V level is connected with output with hygrosensor U8 by resistance R 12 in turn; output is by resistance R 13 ground connection, also by resistance C2 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130270.XU CN203747758U (en) | 2014-03-21 | 2014-03-21 | Power amplifier standing wave protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130270.XU CN203747758U (en) | 2014-03-21 | 2014-03-21 | Power amplifier standing wave protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203747758U true CN203747758U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420130270.XU Expired - Lifetime CN203747758U (en) | 2014-03-21 | 2014-03-21 | Power amplifier standing wave protection circuit |
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| CN (1) | CN203747758U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320094A (en) * | 2014-09-09 | 2015-01-28 | 成都四威航空电源有限公司 | Pulse signal standing-wave protecting circuit |
| US11277211B2 (en) | 2018-09-24 | 2022-03-15 | Andrew Wireless Systems Gmbh | Methods and apparatuses for power control |
-
2014
- 2014-03-21 CN CN201420130270.XU patent/CN203747758U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320094A (en) * | 2014-09-09 | 2015-01-28 | 成都四威航空电源有限公司 | Pulse signal standing-wave protecting circuit |
| CN104320094B (en) * | 2014-09-09 | 2017-06-16 | 成都四威功率电子科技有限公司 | Pulse signal standing-wave protecting circuit |
| US11277211B2 (en) | 2018-09-24 | 2022-03-15 | Andrew Wireless Systems Gmbh | Methods and apparatuses for power control |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140730 |