CN216122357U - Radio frequency amplifier protection alarm circuit and radio frequency amplifier thereof - Google Patents
Radio frequency amplifier protection alarm circuit and radio frequency amplifier thereof Download PDFInfo
- Publication number
- CN216122357U CN216122357U CN202122280524.9U CN202122280524U CN216122357U CN 216122357 U CN216122357 U CN 216122357U CN 202122280524 U CN202122280524 U CN 202122280524U CN 216122357 U CN216122357 U CN 216122357U
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- frequency amplifier
- output
- input
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to a radio frequency amplifier protection alarm circuit and a radio frequency amplifier thereof, comprising: the device comprises an input signal detection module, a first switch module, a logic control module and an output signal detection module; wherein the logic control module comprises: a first comparator, a second comparator and an OR gate sub-circuit; the radio frequency amplifier protection alarm circuit provided by the utility model can simultaneously detect the voltage of input and output radio frequency signals through the input signal detection module and the output detection module, and can prevent the radio frequency input signals from being transmitted to the radio frequency amplifier when the input voltage and/or the output voltage exceed the corresponding threshold value so as to protect the radio frequency amplifier.
Description
Technical Field
The utility model relates to the technical field of radio frequency power amplifiers, in particular to a radio frequency amplifier protection alarm circuit and a radio frequency amplifier thereof.
Background
The radio frequency power amplifier is widely applied to the fields of communication, medical treatment and military industry, and belongs to a core component unit in a system. Due to complex external environment factors, electromagnetic interference is easy to generate, instantaneous fluctuation of a power grid and other comprehensive factors, the radio frequency amplifier is damaged by the phenomena of over-power, self-excitation, overlarge reflected power and the like. In order to prevent the damage of the rf power amplifier, hardware protection is required to be provided for the rf power amplifier.
The existing radio frequency protection circuit technology is only limited to the over-power amplitude limiting protection of an input port or the attenuation protection of an output port reflected power sampling control input signal. In practical applications, the protection mechanisms of the two circuits still have certain limitations, and cannot be effectively protected against the following situations:
1. the radio frequency amplifier circuit attenuates the power of an input signal to be self-excited after the radio frequency amplifier is self-excited by the interference of an external environment;
2. after the external environment of the radio frequency amplifier disturbs self-excitation, the radio frequency amplifying circuit of the input signal which can freely self-excite is disconnected;
3. typically, the product gain is fixed. In the case of a constant input power, the output power is theoretically constant. Under the influence of working temperature, power supply interference and the like, when the input power is unchanged, if the output power is abnormally increased or abnormally reduced, the gain of the radio frequency amplification circuit is changed, the circuit is in an abnormal working state, and the traditional protection technology cannot realize the protection function.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: the circuit simultaneously detects the voltage of input/output radio frequency signals through an input signal detection module and an output detection module, and has the functions of input overpower protection, output reflected power overpower protection, amplification circuit gain abnormity protection and the like.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a radio frequency amplifier protection alarm circuit comprising: the device comprises an input signal detection module, a first switch module, a logic control module and an output signal detection module; wherein the logic control module comprises: a first comparator, a second comparator and an OR gate sub-circuit; the first input end of the first switch module is used for receiving a radio frequency input signal, and the first output end of the first switch module is connected with the input end of the radio frequency amplifier;
the input signal detection module is used for receiving a radio frequency input signal and collecting the voltage of the radio frequency input signal of the radio frequency amplifier, and the output end of the input signal detection module is connected with the first input end of the first comparator; the output end of the first comparator is connected with the first input end of the OR gate circuit; the first comparator is used for outputting a first signal to the OR gate sub-circuit when the radio frequency input signal exceeds a first voltage threshold;
the output signal detection module is used for receiving a radio frequency output signal and collecting the voltage of the radio frequency output signal of the radio frequency amplifier, the output end of the output signal detection module is connected with the first input end of the second comparator, and the output end of the second comparator is connected with the second input end of the OR gate circuit; the first comparator is used for outputting a second signal to the OR gate sub-circuit when the radio frequency output signal exceeds a second voltage threshold;
the output end of the OR gate sub-circuit is connected with the second input end of the first switch module, and the OR gate sub-circuit is used for outputting a control signal to the first switch module according to the first signal and/or the second signal and controlling the first output end of the first switch module to be disconnected.
According to a specific implementation manner, in the above radio frequency amplifier protection alarm circuit, the circuit further includes: a matched load, an input end of the matched load is connected with the second output end of the first switch module,
the first switch module is used for conducting a third port according to the control signal and transmitting the radio frequency input signal to the matched load.
According to a specific implementation manner, in the above radio frequency amplifier protection alarm circuit, the input signal detection module includes: a splitter, a first detector;
the input end of the multiplexer/demultiplexer is used for receiving a radio frequency input signal, and the first output end of the multiplexer/demultiplexer is connected with the first input end of the first switch module;
the second output end of the divider is connected with the input end of the first detector; and the output end of the detector is connected with the first input end of the first comparator.
According to a specific implementation manner, in the above radio frequency amplifier protection alarm circuit, the output signal detection module includes: a directional coupler, a second detector;
the input end of the directional coupler is coupled with the output port of the radio frequency amplifier; the output end of the directional coupler is connected with the input end of the second detector, and the output end of the second detector is connected with the first input end of the second comparator.
According to a specific implementation manner, in the above radio frequency amplifier protection alarm circuit, the circuit further includes: a microcontroller;
the microcontroller comprises: a first sampling port, a second sampling port; the first sampling port of the microcontroller is connected with the output end of the first detector, and the second sampling port of the microcontroller is connected with the output end of the second detector;
the microcontroller is used for receiving the input power of the radio frequency input signal collected by the first detector and the output power of the radio frequency output signal collected by the second detector; and monitoring the working state of the radio frequency amplifier according to the acquired output power and input power, and when the radio frequency amplifier is in an abnormal state, alarming the abnormal state of the radio frequency amplifier and storing the current output power value.
According to a specific implementation manner, in the above radio frequency amplifier protection alarm circuit, the circuit further includes: a second switch module for controlling the operation of the switch,
the first input end of the second switch module is connected with a direct current power supply, and the output end of the second switch module is connected with the direct current power supply input port of the radio frequency amplifier; a second input end of the second switch module is connected with a control signal output port of the microcontroller;
when the microcontroller monitors that the radio frequency amplifier is in an abnormal state, the microcontroller can output a control signal to the second switch module through the control signal output port to control the second switch module to be disconnected and block the direct current power supply from being transmitted to the radio frequency amplifier.
According to a specific implementation manner, in the above radio frequency amplifier protection alarm circuit, the microcontroller further includes an I/O port, and the I/O port is configured to receive an external pulse signal;
and when the microcontroller receives an external pulse signal, the first sampling port and the second sampling port are synchronously triggered to sample, so that the monitoring alarm of the working state of the radio frequency amplifier is synchronously triggered according to the external pulse signal.
According to a specific implementation manner, the radio frequency amplifier protection alarm circuit further includes: the microcontroller is connected with the second input end of the first comparator and the second input end of the second comparator respectively through the digital-to-analog converter, and the microcontroller can adjust a first voltage threshold preset in the first comparator and a first voltage threshold preset in the second comparator through the digital-to-analog converter according to a set threshold of a user.
In a further embodiment of the present invention, there is also provided a radio frequency amplifier, including the above radio frequency amplifier protection alarm circuit.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1. the radio frequency amplifier protection alarm circuit provided by the utility model can simultaneously detect the voltage of input and output radio frequency signals through the input signal detection module and the output detection module, and can prevent the radio frequency input signals from being transmitted to the radio frequency amplifier when the input voltage and/or the output voltage exceed the corresponding threshold value so as to protect the radio frequency amplifier.
2. The radio frequency amplifier protection alarm circuit provided by the utility model also designs a second alarm mechanism for sampling and monitoring the input power and the output power by the MCU, determines the working state of the radio frequency amplifier by monitoring the input power and the output power in real time, and carries out secondary protection on the radio frequency amplifier by turning off a direct current power supply of the radio frequency amplifier when the radio frequency amplifier is in an abnormal state, thereby further perfecting the protection mechanism of the radio frequency amplifier. And setting alarm log management in the corresponding MCU, recording the alarm information of the circuit (the abnormal state alarm information of the radio frequency amplifier) for later inquiry, tracing, analysis and calling.
3. The radio frequency amplifier protection alarm circuit provided by the utility model is characterized in that a trigger synchronous interface (I/O interface) is additionally arranged in the MCU, so that the circuit can be compatible with the protection and monitoring alarm of the radio frequency pulse amplifier, the application range of the circuit is expanded, the sampling mechanism of the MCU is synchronous with the pulse working period of the pulse radio frequency amplifier, the invalid data acquisition and processing can be effectively prevented, and the wrong alarm protection is generated.
Drawings
Fig. 1 is a schematic block diagram of a radio frequency amplifier protection alarm circuit of the present invention.
Fig. 2 is a schematic diagram of the structure of the rf amplifier protection alarm circuit of the present invention.
Fig. 3 is a schematic diagram of the pulse duty cycle of the pulsed rf amplifier of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Example 1
Fig. 1 shows a radio frequency amplifier protection alarm circuit according to an exemplary embodiment of the present invention, including: the device comprises an input signal detection module, a first switch module, a logic control module and an output signal detection module; the first input end of the first switch module is used for receiving a radio frequency input signal, and the first output end of the first switch module is connected with the input end of the radio frequency amplifier;
wherein the logic control module comprises: a first comparator, a second comparator and an OR gate sub-circuit; the input signal detection module is used for collecting the voltage of a radio frequency input signal of a radio frequency amplifier, and the output end of the input signal detection module is connected with the first input end of the first comparator; the output end of the first comparator is connected with the first input end of the OR gate circuit; the first comparator is used for outputting a first signal to the OR gate sub-circuit when the radio frequency input signal exceeds a first voltage threshold (input voltage threshold);
the output signal detection module is used for collecting the voltage of a radio frequency output signal of the radio frequency amplifier, the output end of the output signal detection module is connected with the first input end of the second comparator, and the output end of the second comparator is connected with the second input end of the OR gate circuit; the first comparator is used for outputting a second signal to the OR gate sub-circuit when the radio frequency output signal exceeds a second voltage threshold (output voltage threshold);
the output end of the OR gate sub-circuit is connected with the second input end of the first switch module, and the OR gate sub-circuit is used for outputting a control signal to the first switch module according to the first signal and/or the second signal and controlling the first output end of the first switch module to be disconnected.
Specifically, as shown in fig. 2, the input signal detection module includes a splitter, a first detector (the input rf detector in fig. 2); the output signal detection module includes: directional coupler, second detector (output rf detector in fig. 2). The input end of the multiplexer/demultiplexer is used for receiving a radio frequency input signal, and the first output end of the multiplexer/demultiplexer is connected with the first input end of the first switch module; the second output end of the divider is connected with the input end of the first detector; and the output end of the detector is connected with the first input end of the first comparator. And, the circuit further comprises: the input end of the matched load is connected with the second output end of the first switch module, the first switch module is further used for conducting a third port according to a control signal of the OR gate circuit so as to transmit a radio frequency input signal to the matched load, and the radio frequency amplifier is subjected to self-excitation protection through a protection loop formed by the matched load.
In a further embodiment of the present invention, the operational state of the amplifier is monitored and protected according to the relationship Pout (output power) -Pin (input power) -G (amplifier gain), i.e., V _ Pout (output power detection voltage) -V _ Pin (input power detection voltage) -V _ G (gain equivalent voltage). When the input power is not changed, the theoretical gain is not changed, namely V _ G is not changed, and when the V _ G of the radio frequency amplifier is monitored to be changed, namely the gain is also changed, the radio frequency amplifier works abnormally. The utility model calculates the difference value V _ G of the sampled output power and the sampled input power detection voltage through the microprocessor. Taking a fixed input power as an example, when V _ G changes, it can be determined that the amplifier is in a normal operating state, and a second alarm mechanism is implemented by controlling a dc operating power supply of the amplifier through a second switch module (in the embodiment, a small measurement error is allowed due to the influence of detection accuracy, so that a deviation of 5% between the obtained difference V _ G and a protection threshold can be set). Further improving the application range of the protection circuit. In order to be compatible with protection and monitoring alarm of the pulse power amplifier and expand the application range, a trigger synchronous interface, sampling of synchronous software and an internal data processing instruction are additionally arranged, and invalid data acquisition and processing are prevented to generate wrong alarm protection. And simultaneously, newly adding alarm log management, recording and applying the latest alarm parameter information, and providing the latest alarm parameter information for later-stage query, tracing, analysis and calling. The function protection circuit has the characteristics of wide application range, more comprehensive protection, simple circuit and the like, and can be widely applied to wired and wireless communication electronic products in the market; and the device can also be used as an external protection and monitoring device for a long-term reliability test project.
In a further embodiment of the present invention, the functions and functions of the various components in the rf amplifier protection alarm circuit provided by the present invention are described with reference to fig. 2. The multiplexer is used for mainly providing two paths of signals of one path and two paths, one path is connected with the input of the radio frequency power amplifier, and the other path is used for detecting the input radio frequency signals. The first switch module K1 is used for providing the turn-off of the input abnormal signal, when the radio frequency input voltage signal and/or the radio frequency output voltage signal exceeding the threshold value are detected, the input port of the radio frequency power amplifier is connected to the matched load through the switch control, and the input signal is disconnected. Second switch module K2: and the working power supply of the radio frequency power amplifier is turned off under the second alarm condition. Radio frequency input detector (first detector): the magnitude of the input power is detected and then converted into a voltage signal, which is compared with a first alarm threshold. The MCU is also linked to provide input power samples. Output detector (second detector): and detecting the output power, converting the output power into a voltage signal, and respectively connecting the second comparator and the MCU for sampling. The directional coupler: the second detector is used for coupling with the output port of the radio frequency amplifier, sampling the power of the radio frequency output signal of the radio frequency amplifier, outputting the power to the second detector and transmitting the linear sampling power of the radio frequency output signal to the second detector. An OR gate circuit: receiving two detection sampling voltages from input and output to realize logic control. In normal operation, the output state of the or gate is low level because no alarm signal exists. When any one alarm signal (input signal alarm or output signal alarm) is collected, the output state of the OR gate is reversed, and the control K1 disconnects the input signal. Further, the circuit further comprises: triggering a synchronous device: and the synchronous signal of the pulse power amplifier is connected through an I/O port of the MCU. When a valid working pulse level is received, data sampling is started, and otherwise, sampling and counting calculation are stopped. And the DAC is connected with the first comparator and the second comparator, and the configuration of the alarm reference threshold value, namely the setting configuration of the first threshold value and the second threshold value, is realized through the DAC.
Therefore, the alarm circuit acquires corresponding detection voltage by detecting the sampling power of the input and output radio frequency signals. This voltage is compared with a first alarm threshold, namely the reference voltage of the two comparators, and the K1 switch is controlled to turn off the input signal. Meanwhile, if the first alarm protection condition is effective, the detected output radio frequency power voltage reaches a second alarm condition, the MCU controls the conduction of the MOS tube, drives the working state of a K2 (relay), and cuts off the working voltage of the radio frequency power amplifier, so that the secondary protection function is realized.
As shown in fig. 2, the first alarm protection principle of the input over-power of the present invention includes: the input signal passes through the multiplexer and outputs two paths of signals. One path is directly connected with the input port of the radio frequency amplifier, and the other path is used for sampling the power of the input signal and is converted into direct current sampling voltage Vout1 through the input detector. This voltage port is connected to the comparator 1 as the comparison voltage for the first alarm. Assuming that the maximum applied rf input power is 0dBm, the corresponding detection voltage is 2.5V, i.e. the reference voltage of the comparator 1 is preset to 2.5V by the DAC (it can also be realized by converting the VC voltage to LDO through resistance voltage division). Once the Vout1 voltage is greater than the reference voltage 2.5V of the comparator 1 when the input power is greater than 0dBm in use, the output level of the comparator is inverted to high level, and a rear port or an NOT-gate circuit is connected. According to the characteristics of the NOR gate circuit, the '1' goes out of the '0', namely the output level of the NOR gate is correspondingly inverted, the state of the K1 switch is controlled, and the original RF1-RFC conduction mode is changed into RF2-RFC conduction. The input signal is disconnected, the input port of the radio frequency amplifier is connected with a 50 omega matching load, and the input of an external abnormal signal and an input overpower signal is effectively blocked to realize a protection function.
As shown in fig. 2, the first alarm protection operating mechanism for outputting over-power of the present invention includes: the output signal passes through the directional coupler to obtain the output sampling power, and is converted into a direct current sampling voltage Vout2 through the input detector. This voltage port is connected to the comparator 2 as the comparison voltage for the first alarm. Assuming that the maximum applied RF output power is 40dBm, the coupling degree of the corresponding directional coupler is 35dB, i.e. the detection RF power of the output detector is +5 dBm. Further, assume that +5dBm corresponds to a detection voltage of 3V, that is, the reference voltage of the comparator 2 is preset to 3V by the DAC (it can be realized by converting the VC voltage to LDO voltage by resistance voltage division). Once the voltage of Vout2 is greater than the reference voltage 3V of comparator 2 when the output power is greater than 40dBm during use, the output level of the comparator is inverted to high level, and the rear port or the NOR gate is connected. According to the characteristics of the NOR gate circuit, the '1' goes out of the '0', namely the output level of the NOR gate is correspondingly inverted, the state of the K1 switch is controlled, and the original RF1-RFC conduction mode is changed into RF2-RFC conduction. And the input signal is disconnected, and the input port of the radio frequency amplifier is connected with a 50 omega matched load, so that the input of an external abnormal signal and an input overpower signal is effectively blocked. And output over-power protection is realized.
As shown in fig. 2, the second alarm protection operating mechanism of the present invention includes: assuming that the detection voltage of Vout2 is 3.5V, corresponding to a detection sampling power of +8dBm, and the coupler coupling degree is 35dB, the output power of the RF amplifier has theoretically reached 43dBm, which is much larger than twice that of the practical application. In this case, the rf amplifier is more likely to fail, and secondary protection of the rf amplifier is necessary to turn off the DC supply voltage. The voltage of the specific implementation mode Vout2 is connected to the MCU for sampling while being connected to the first output alarm protection. The sampled voltage is compared with a second alarm voltage arranged in software through the software, if the voltage exceeds a second alarm reference threshold, the current voltage of Vout2 or a reverse-thrust output power value is recorded and stored into the MCU as an alarm point, and meanwhile, the MCU controls the conduction state of U1(MOS) and drives the switch K2 to be switched off, so that the DC switching-off of the radio frequency amplifier is realized. Secondly, based on the relationship of POUT (PIN + G), after the voltages of Vout1 and Vout2 are sampled each time, the MCU calculates the voltage difference value, and then the voltage difference value is compared with the next sampling value. If the difference value of the two times exceeds the preset value, the working state of the amplifier is unstable, the MCU is required to control the conduction state of U1(MOS), the switch K2 is driven to be turned off, and the DC turn-off of the radio frequency amplifier is realized. And simultaneously recording the current voltage or the reverse-deducing output power value of the Vout1 and the Vout2 as a report point to be stored in the MCU.
In the preferred embodiment of the utility model, the sampling precision calibration correction and the detection sampling voltage correction of the detector can be realized by writing a program in the MCU, and because of the individual difference of detection sampling chips, voltage calibration needs to be carried out on detection dynamic ranges of different detectors by using a standard power source, and the writing program is called, so that the sampling accuracy is improved.
Further, the sampling and abnormal alarm log management of the non-pulse radio frequency amplifier, that is, the MCU sampling management working mechanism of the non-pulse synchronous trigger sampling provided by the present invention includes: and (3) assuming that the sampling frequency of the MCU software is preset to be 0.1ms, and performing real-time sampling according to the sampling frequency. When detecting that the voltage of Vout1 exceeds the reference voltage of the comparator 1 or the voltage of Vout2 exceeds the reference voltage of the comparator 2, recording current sampling abnormal data as a reported power point, and storing the reported power point to the MCU. When the voltage of Vout2 is detected to exceed the second alarm threshold in the software, the MCU controls the on state of U1(MOS) to drive the switch K2 to be turned off. And simultaneously, recording current sampling data, storing the current sampling data into the MCU, analogizing to store the sampling value during each alarm, automatically performing iterative refreshing until the sampling value exceeds the storage capacity, and discarding the recording data with the earliest abnormality. The second alarm threshold setting is divided into two, wherein one high threshold voltage setting is larger than the rated output power by one time and corresponds to the detection voltage, and protection of ultrahigh output power is provided. Another alarm threshold requires comparing the difference Δ V between the Vout1 and Vout2 voltages sampled at each time. Theoretically, when the amplifier normally operates, the input power, the amplifier gain, and the output power are fixed, and therefore Δ V — Δ V is 0. The alarm threshold can be set to be not between 0 theoretically, and alarm protection is started. In a further embodiment of the present invention, there is also provided a sampling and abnormal alarm log management operation mechanism for a radio frequency amplifier based on pulse triggering, including: referring to the pulse operation diagram shown in fig. 3, the pulse rf amplifier operates in a period of time, which is defined as "TU", and in an idle or non-operating state, which is defined as "Tblank". One full duty cycle time, TU + Tblank, is defined as TR. For such power amplifiers, the power sampling value in the non-operating state cannot be used for comparative protection control. The solution is that an external trigger synchronous interface receives trigger signals from the pulse amplifier in the same period to carry out software sampling synchronization.
The software sampling mechanism starts voltage data acquisition of Vout1 and Vout2 after receiving an external trigger high level. When the trigger signal is low, the sampling is stopped. In practical application, the software sampling frequency and the time of the TU cannot be exactly equally divided, and in order to ensure the correctness of the sampled data, the sampled data after receiving the low-level trigger signal cannot be used for software processing. The first alarm and the second alarm of the pulse power amplifier are consistent with those of the non-pulse power amplifier, and are not separately explained here.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A radio frequency amplifier protection alarm circuit, comprising: the device comprises an input signal detection module, a first switch module, a logic control module and an output signal detection module; wherein the logic control module comprises: a first comparator, a second comparator and an OR gate sub-circuit; the first input end of the first switch module is used for receiving a radio frequency input signal, and the first output end of the first switch module is connected with the input end of the radio frequency amplifier;
the input signal detection module is used for receiving a radio frequency input signal and collecting the voltage of the radio frequency input signal of the radio frequency amplifier, and the output end of the input signal detection module is connected with the first input end of the first comparator; the output end of the first comparator is connected with the first input end of the OR gate sub-circuit; the first comparator is used for outputting a first signal to the OR gate sub-circuit when the radio frequency input signal exceeds a first voltage threshold;
the output signal detection module is used for receiving a radio frequency output signal and collecting the voltage of the radio frequency output signal of the radio frequency amplifier, the output end of the output signal detection module is connected with the first input end of the second comparator, and the output end of the second comparator is connected with the second input end of the OR gate sub-circuit; the first comparator is used for outputting a second signal to the OR gate sub-circuit when the radio frequency output signal exceeds a second voltage threshold;
the output end of the OR gate sub-circuit is connected with the second input end of the first switch module, and the OR gate sub-circuit is used for outputting a control signal to the first switch module according to the first signal and/or the second signal and controlling the first output end of the first switch module to be disconnected.
2. The radio frequency amplifier protection alarm circuit of claim 1, wherein the circuit further comprises: a matched load, an input end of the matched load is connected with the second output end of the first switch module,
the first switch module is used for conducting a third port according to the control signal and transmitting the radio frequency input signal to the matched load.
3. The radio frequency amplifier protection alarm circuit of claim 1, wherein the input signal detection module comprises: a splitter, a first detector;
the input end of the multiplexer/demultiplexer is used for receiving a radio frequency input signal, and the first output end of the multiplexer/demultiplexer is connected with the first input end of the first switch module;
the second output end of the divider is connected with the input end of the first detector; and the output end of the detector is connected with the first input end of the first comparator.
4. The radio frequency amplifier protection alarm circuit according to claim 2 or 3, wherein the output signal detection module comprises: a directional coupler, a second detector;
the input end of the directional coupler is coupled with the output port of the radio frequency amplifier; the output end of the directional coupler is connected with the input end of the second detector, and the output end of the second detector is connected with the first input end of the second comparator.
5. The radio frequency amplifier protection alarm circuit of claim 4, wherein the circuit further comprises: a microcontroller;
the microcontroller comprises: a first sampling port, a second sampling port; the first sampling port of the microcontroller is connected with the output end of the first detector, and the second sampling port of the microcontroller is connected with the output end of the second detector;
the microcontroller is used for receiving the input power of the radio frequency input signal collected by the first detector and the output power of the radio frequency output signal collected by the second detector; and monitoring the working state of the radio frequency amplifier according to the acquired output power and input power, and when the radio frequency amplifier is in an abnormal state, alarming the abnormal state of the radio frequency amplifier and storing the current output power value.
6. The radio frequency amplifier protection alarm circuit of claim 5, wherein the circuit further comprises: a second switch module for controlling the operation of the switch,
the first input end of the second switch module is connected with a direct current power supply, and the output end of the second switch module is connected with the direct current power supply input port of the radio frequency amplifier; a second input end of the second switch module is connected with a control signal output port of the microcontroller;
when the microcontroller monitors that the radio frequency amplifier is in an abnormal state, the microcontroller can output a control signal to the second switch module through the control signal output port to control the second switch module to be disconnected and block the direct current power supply from being transmitted to the radio frequency amplifier.
7. The radio frequency amplifier protection alarm circuit of claim 5 or 6, wherein the microcontroller further comprises an I/O port for receiving an external pulse signal;
and when the microcontroller receives an external pulse signal, the first sampling port and the second sampling port are synchronously triggered to sample, so that the monitoring alarm of the working state of the radio frequency amplifier is synchronously triggered according to the external pulse signal.
8. The radio frequency amplifier protection alarm circuit of claim 5, further comprising: the microcontroller is connected with the second input end of the first comparator and the second input end of the second comparator respectively through the digital-to-analog converter, and the microcontroller can adjust a first voltage threshold preset in the first comparator and a first voltage threshold preset in the second comparator through the digital-to-analog converter according to a set threshold of a user.
9. A radio frequency amplifier, characterized in that the radio frequency amplifier comprises a radio frequency amplifier protection alarm circuit according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122280524.9U CN216122357U (en) | 2021-09-18 | 2021-09-18 | Radio frequency amplifier protection alarm circuit and radio frequency amplifier thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122280524.9U CN216122357U (en) | 2021-09-18 | 2021-09-18 | Radio frequency amplifier protection alarm circuit and radio frequency amplifier thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216122357U true CN216122357U (en) | 2022-03-22 |
Family
ID=80734925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122280524.9U Active CN216122357U (en) | 2021-09-18 | 2021-09-18 | Radio frequency amplifier protection alarm circuit and radio frequency amplifier thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216122357U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825529A (en) * | 2022-12-25 | 2023-03-21 | 北京屹唐半导体科技股份有限公司 | Radio frequency probe, radio frequency matcher, radio frequency power supply and radio frequency measuring instrument |
-
2021
- 2021-09-18 CN CN202122280524.9U patent/CN216122357U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825529A (en) * | 2022-12-25 | 2023-03-21 | 北京屹唐半导体科技股份有限公司 | Radio frequency probe, radio frequency matcher, radio frequency power supply and radio frequency measuring instrument |
| CN115825529B (en) * | 2022-12-25 | 2023-11-17 | 北京屹唐半导体科技股份有限公司 | Radio frequency probe, radio frequency matcher, radio frequency power supply and radio frequency measuring instrument |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN216122357U (en) | Radio frequency amplifier protection alarm circuit and radio frequency amplifier thereof | |
| CN201766557U (en) | Radio frequency (RF) power amplitude limiting circuit | |
| CN112531632A (en) | Low-cost burn-proof board protection method and device in server | |
| CN214506538U (en) | Overcurrent protection circuit and overcurrent protection device | |
| WO2021129794A1 (en) | Auxiliary control circuit for power amplification module, power amplification module, and communication device | |
| CN111756393A (en) | Building construction information management system based on Internet of things | |
| CN204374227U (en) | For the signal acquisition circuit of motor speed test | |
| CN203551125U (en) | Over-temperature alarm circuit | |
| CN102565745A (en) | Ultra high-frequency partial discharge sensor | |
| CN204177863U (en) | A kind of high-precision pulse power detection module | |
| US10447266B2 (en) | Low power energy detector | |
| CN113541643A (en) | Power control device and method for signal generator and signal generator | |
| CN113300205A (en) | Fiber laser protection system and device | |
| CN104330617A (en) | High-accuracy pulse power detection module | |
| CN210295386U (en) | Safety early warning device of electronic information measurement experiment table | |
| CN106451065B (en) | Semiconductor laser constant current driving system | |
| CN218765695U (en) | Temperature detection circuit for controller power switch device | |
| CN210345991U (en) | Power regulating device of air source heat pump machine | |
| CN210007675U (en) | protection circuit based on radio frequency power amplifier system | |
| CN204758686U (en) | Offset -type voltage detector | |
| CN218550159U (en) | Audio squelch circuit | |
| EP4218453B1 (en) | Battery rod, atomizer, and electronic atomization device | |
| CN215419578U (en) | Full-hardware protection circuit applied to high-power converter | |
| CN219657867U (en) | Laser signal receiver | |
| CN214154331U (en) | Ultrasonic power frequency tracking circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |