CN212935852U - Automatic protection device for radio frequency power amplifier - Google Patents
Automatic protection device for radio frequency power amplifier Download PDFInfo
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- CN212935852U CN212935852U CN202021452114.7U CN202021452114U CN212935852U CN 212935852 U CN212935852 U CN 212935852U CN 202021452114 U CN202021452114 U CN 202021452114U CN 212935852 U CN212935852 U CN 212935852U
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Abstract
The utility model discloses an automatic protection device of a radio frequency power amplifier, which comprises a power amplifier, a current detection circuit, a temperature detection circuit and a comparison and judgment circuit; the power amplifier is respectively connected with the current detection circuit and the temperature detection circuit, the current detection circuit and the temperature detection circuit are connected with the comparison and judgment circuit, and the comparison and judgment circuit is connected with the power amplifier. The current detection circuit is connected with the power amplifier in parallel and is used for monitoring the real-time working current of the power amplifier. The temperature detection circuit is arranged near the power amplifier and used for monitoring the real-time working temperature of the power amplifier. The utility model discloses the device is compared the mode of digital processing data, and the data processing mode of whole hardware circuit can be accurate quick detects radio frequency power amplifier's real-time current value and operating temperature, can in time cut off power supply in order to reach the purpose of automatic protection power amplifier when abnormal condition appears in power amplifier.
Description
Technical Field
The utility model relates to a power amplifier technical field, especially a radio frequency power amplifier automatic safety device.
Background
Power amplifiers are widely used in electronic countermeasure, satellite communication, and mobile communication systems, and have a significant position. Power amplifiers are expensive and fragile compared to other devices in the system and need to be protected to ensure overall system stability. When the radio frequency is overloaded, the instantaneous large current may cause the power amplifier to be burnt, the power amplifier is continuously heated by long-time work, the performance of the power amplifier is reduced when the temperature is too high, and meanwhile, the aging of the device is accelerated, so that the power amplifier is protected from the conditions of overcurrent and overtemperature.
The shortcomings of the prior art and the technical problems to be solved by the proposal of the application are as follows:
most of the existing protection technologies for radio frequency power amplifiers adopt a digital mode for data processing, but factors causing the abnormality of the power amplifier are often instantaneous, especially instantaneous large current generated by radio frequency overload. The digital processing process is related to the working frequency, and the corresponding speed to the abnormal state is slow, so that the radio frequency power amplifier cannot be protected in time.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model discloses adopt digital mode to handle data to prior art and lead to catching unusual state in the twinkling of an eye rapidly inadequately, can not in time protect radio frequency power amplifier's defect, according to radio frequency power amplifier characteristics and cause the reason of inefficacy and design out and carry out real-time supervision to two state information of power amplifier electric current, temperature in order to reach the purpose of automatic protection radio frequency power amplifier.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an automatic protection device of a radio frequency power amplifier comprises a power amplifier, a current detection circuit, a temperature detection circuit and a comparison judgment circuit;
the power amplifier is respectively connected with the current detection circuit and the temperature detection circuit, the current detection circuit and the temperature detection circuit are connected with the comparison and judgment circuit, and the comparison and judgment circuit is connected with the power amplifier. The current detection circuit is connected with the power amplifier in parallel and is used for monitoring the real-time working current of the power amplifier. The temperature detection circuit is arranged near the power amplifier and used for monitoring the real-time working temperature of the power amplifier. The current detection circuit is connected with the comparison and judgment circuit, the current value acquired by the current detection circuit in real time is compared with a preset threshold value in the comparison and judgment circuit, if the current value exceeds the threshold value, the comparison and judgment circuit outputs a high level, and the setting of the threshold value is determined by a resistor connected with a second input end of the operational amplifier chip. The temperature detection circuit is connected with the comparison and judgment circuit, the current value acquired by the temperature detection circuit in real time is compared with a preset threshold value in the comparison and judgment circuit, if the current value exceeds the threshold value, the comparison and judgment circuit outputs a high level, and the setting of the threshold value is determined by a resistor connected with a first input end of the operational amplifier chip. The comparison and judgment circuit is connected with the power amplifier to provide grid voltage for the power amplifier. The comparison and judgment circuit carries out logic OR operation on the judgment results of the current and the temperature threshold, as long as one path of the judgment results outputs a high level, the input of the MOS tube is the high level, the MOS tube is switched off to output a low level, the grid voltage of the power amplifier is low, and the power amplifier stops working.
Specifically, the power amplifier is a radio frequency signal power amplifier, the power amplifier is connected in parallel with an input end VIN of the current detection circuit, and the power amplifier is arranged near a temperature sensing chip a of the temperature detection circuit.
Specifically, the current detection circuit comprises an input end VIN, an output end V-OUT, a current detection chip C, an operational amplifier chip D, a zener diode D1, a capacitor C1, a capacitor C2, a resistor R5, a resistor R6, a resistor R7, and a variable resistor VR 2; the input end VIN is connected with the upper end of a voltage stabilizing diode D1; the upper end of the voltage-stabilizing diode D1 is connected with the upper end of the capacitor C1, and the lower end of the voltage-stabilizing diode D1 is connected with the upper end of the resistor R5; the upper end of the resistor R5 is connected with the TEST end of the current detection chip C, and the lower end of the resistor R5 is connected with GND; the upper end of the capacitor C1 is connected with the SENSE + end of the current detection chip C, and the lower end of the capacitor C1 is connected with the GND end and the TEST end of the current detection chip C; the upper end of the capacitor C2 is connected with the FLTR + end of the current detection chip C, and the lower end of the capacitor C2 is connected with the FLTR-end; the upper end of the resistor R6 is connected with GND, and the lower end of the resistor R6 is connected with the SENSE-end of the current detection chip C; the IN + end of the operational amplifier chip is connected with the PWM end of the current detection chip, the IN-end is connected with the upper end of a resistor R7, the V end is connected with VCC, the G end is connected with GND, and the OUT end is connected with the middle end, the upper end and the output end V-OUT of a variable resistor VR 2; the lower end of the variable resistor VR2 is connected with the upper end of the resistor R7; the lower end of the resistor R7 is connected with GND; and the output end V-OUT is connected with the input end V-IN of the comparison and judgment circuit.
Specifically, the temperature detection circuit comprises a temperature sensing chip A, an operational amplifier chip B, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a variable resistor VR 1; the VCC end of the temperature sensing chip A is connected with VCC, the GND end is connected with GND, and the OUT end is connected with the lower end of a resistor R1; the upper end of the resistor R1 is connected with VCC; the left end of the resistor R2 is connected with the lower end of the resistor R1, and the right end of the resistor R2 is connected with the IN-end of the operational amplifier chip B; the left end of the resistor R3 is connected with GND, and the right end of the resistor R3 is connected with the IN + end of the operational amplifier chip B; the upper end of the resistor R4 is connected with the OUT end of the operational amplifier chip and the lower end is connected with the IN-end of the operational amplifier chip; the adjusting end of the variable resistor VR1 is connected with the V + end of the operational amplifier chip B, the left end of the variable resistor VR1 is connected with the OS end of the operational amplifier chip B, and the TAB end of the operational amplifier chip B is connected with the right end of the variable resistor VR 1; the V + end of the operational amplifier chip B is connected with VCC, the V-end is connected with GND, and the OUT end is connected with the output end T-OUT end; and the output end T-OUT is connected with the input end T-IN of the comparison and judgment circuit.
Specifically, the comparison and judgment circuit comprises an input end V-IN, an input end T-IN, an operational amplifier chip E, an MOS transistor Q1, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode D2 and a diode D3; the left end of the resistor R12 is connected with the left end of the resistor R14, and the right end of the resistor R12 is connected with the IN2+ end of the operational amplifier chip E; the left end of the resistor R13 is connected with GND, and the right end of the resistor R13 is connected with the IN 2-end of the operational amplifier chip E; the left end of the resistor R14 is connected with VCC, and the right end of the resistor R14 is connected with the IN 2-end of the operational amplifier chip E; the left end of the resistor R15 is connected with VCC, and the right end of the resistor R15 is connected with the OUT2 end of the operational amplifier chip E; the left end of the resistor R8 is connected with the IN1+ end of the operational amplifier chip E, and the right end of the resistor R10 is connected with the right end of the operational amplifier chip E; the left end of the resistor R9 is connected with the IN 1-end of the operational amplifier chip E, and the right end of the resistor R9 is connected with GND; the left end of the resistor R10 is connected with the IN 1-end of the operational amplifier chip E, and the right end of the resistor R10 is connected with VCC; the left end of the resistor R11 is connected with the OUT1 end of the operational amplifier chip E, and the right end of the resistor R11 is connected with VCC; the positive end of the diode D2 is connected with the OUT1 end of the operational amplifier chip E, and the negative end of the diode D2 is connected with the negative end of the diode D3; the positive terminal of the diode D3 is connected with the OUT2 terminal of the operational amplifier chip E; the upper end of the resistor R16 is connected with the negative electrode end of the diode D3, and the lower end of the resistor R16 is connected with GND; the G end of the MOS transistor Q1 is connected with the positive end of the triode D3, the S end is connected with VCC, and the D end is connected with the power amplifier to provide grid voltage for the power amplifier.
Has the advantages that:
the utility model discloses the device provides effective, feasible method for the problem of radio frequency power amplifier automatic protection, and whole device adopts whole hardware circuit design, and its is small, and the control principle is simple and reliable. Compared with a digital data processing mode, the data processing mode of the whole hardware circuit can accurately and quickly detect the real-time current value and the working temperature of the radio frequency power amplifier, and the power supply can be timely cut off when the power amplifier is in an abnormal state so as to achieve the purpose of automatically protecting the power amplifier.
Drawings
These and/or other advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings and the following detailed description.
Fig. 1 is a functional circuit connection block diagram of the automatic protection device for the rf power amplifier.
Fig. 2 is a circuit diagram of the current detection circuit of the automatic protection device for the rf power amplifier.
Fig. 3 is a circuit diagram of the temperature detection of the automatic protection device for the rf power amplifier.
Fig. 4 is a comparison and determination circuit diagram of the automatic protection device for rf power amplifier.
Fig. 5 is a schematic diagram of a power amplifier of the automatic protection apparatus for an rf power amplifier.
Detailed Description
The invention will be better understood from the following examples.
The drawings in the specification show the structure, ratio, size, etc. only for the purpose of matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and not for the purpose of limiting the present invention, so the present invention does not have the essential meaning in the art, and any structure modification, ratio relationship change or size adjustment should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and achievable purpose of the present invention. Meanwhile, the terms "upper", "lower", "front", "rear", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
As shown in fig. 1, in the present embodiment, the automatic protection device for a radio frequency power amplifier mainly includes a power amplifier 1, a current detection circuit 2, a temperature detection circuit 3, and a comparison and determination circuit 4. The current detection circuit 2 is connected with the power amplifier 1 in parallel and is used for monitoring the real-time working current of the power amplifier; the temperature detection circuit 3 is arranged near the power amplifier 1 and used for monitoring the real-time working temperature of the power amplifier; the current detection circuit 2 is connected with the comparison and judgment circuit 4, the current value acquired by the current detection circuit 2 in real time is compared with a preset threshold value in the comparison and judgment circuit 4, if the current value exceeds the threshold value, the comparison and judgment circuit 4 outputs a high level, and the setting of the threshold value is determined by a resistor connected with a second input end of the operational amplifier chip; the temperature detection circuit 3 is connected with the comparison and judgment circuit 4, the current value acquired by the temperature detection circuit 3 in real time is compared with a preset threshold value in the comparison and judgment circuit 4, if the current value exceeds the threshold value, the comparison and judgment circuit 4 outputs a high level, and the setting of the threshold value is determined by a resistor connected with a first input end of an operational amplifier chip; the comparing and determining circuit 4 is connected to the power amplifier 1 to provide the gate voltage for the power amplifier 1. The comparison and judgment circuit carries out logic OR operation on the judgment results of the current and the temperature threshold, as long as one path of the judgment results outputs a high level, the input of the MOS tube is the high level, the MOS tube is switched off to output a low level, the grid voltage of the power amplifier is low, and the power amplifier stops working.
As shown in fig. 2, in the present embodiment, the current detection circuit 2 includes an input terminal VIN, an output terminal V-OUT, a current detection chip C with a model LM3824, an operational amplifier chip D with a model AD8639, a zener diode D1, a capacitor C1, a capacitor C2, a resistor R5, a resistor R6, a resistor R7, and a variable resistor VR 2; the input end VIN is connected with the upper end of a voltage stabilizing diode D1; the upper end of the voltage-stabilizing diode D1 is connected with the upper end of the capacitor C1, and the lower end of the voltage-stabilizing diode D1 is connected with the upper end of the resistor R5; the upper end of the resistor R5 is connected with the TEST end of the current detection chip C, and the lower end of the resistor R5 is connected with GND; the upper end of the capacitor C1 is connected with the SENSE + end of the current detection chip C, and the lower end of the capacitor C1 is connected with the GND end and the TEST end of the current detection chip C; the upper end of the capacitor C2 is connected with the FLTR + end of the current detection chip C, and the lower end of the capacitor C2 is connected with the FLTR-end; the upper end of the resistor R6 is connected with GND, and the lower end of the resistor R6 is connected with the SENSE-end of the current detection chip C; the IN + end of the operational amplifier chip is connected with the PWM end of the current detection chip, the IN-end is connected with the upper end of a resistor R7, the V end is connected with VCC, the G end is connected with GND, and the OUT end is connected with the middle end, the upper end and the output end V-OUT of a variable resistor VR 2; the lower end of the variable resistor VR2 is connected with the upper end of the resistor R7; the lower end of the resistor R7 is connected with GND; and the output end V-OUT is connected with the input end V-IN of the comparison and judgment circuit 4.
As shown in fig. 3, in the present embodiment, the temperature detection circuit 3 includes a temperature sensing chip a with a model LM35, an operational amplifier chip B with a model 0P07, a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a variable resistor VR 1; the VCC end of the temperature sensing chip A is connected with VCC, the GND end is connected with GND, and the OUT end is connected with the lower end of a resistor R1; the upper end of the resistor R1 is connected with VCC; the left end of the resistor R2 is connected with the lower end of the resistor R1, and the right end of the resistor R2 is connected with the IN-end of the operational amplifier chip B; the left end of the resistor R3 is connected with GND, and the right end of the resistor R3 is connected with the IN + end of the operational amplifier chip B; the upper end of the resistor R4 is connected with the OUT end of the operational amplifier chip and the lower end is connected with the IN-end of the operational amplifier chip; the adjusting end of the variable resistor VR1 is connected with the V + end of the operational amplifier chip B, the left end of the variable resistor VR1 is connected with the OS end of the operational amplifier chip B, and the TAB end of the operational amplifier chip B is connected with the right end of the variable resistor VR 1; the V + end of the operational amplifier chip B is connected with VCC, the V-end is connected with GND, and the OUT end is connected with the output end T-OUT end; and the output end T-OUT is connected with the input end T-IN of the comparison and judgment circuit 4.
As shown IN fig. 4, IN the present embodiment, the comparing and determining circuit 4 includes an input terminal V-IN, an input terminal T-IN, an operational amplifier chip E with a model LM358, a MOS transistor Q1 with a model SSM3J332R-P, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode D2, and a diode D3; the left end of the resistor R12 is connected with the left end of the resistor R14, and the right end of the resistor R12 is connected with the IN2+ end of the operational amplifier chip E; the left end of the resistor R13 is connected with GND, and the right end of the resistor R13 is connected with the IN 2-end of the operational amplifier chip E; the left end of the resistor R14 is connected with VCC, and the right end of the resistor R14 is connected with the IN 2-end of the operational amplifier chip E; the left end of the resistor R15 is connected with VCC, and the right end of the resistor R15 is connected with the OUT2 end of the operational amplifier chip E; the left end of the resistor R8 is connected with the IN1+ end of the operational amplifier chip E, and the right end of the resistor R10 is connected with the right end of the operational amplifier chip E; the left end of the resistor R9 is connected with the IN 1-end of the operational amplifier chip E, and the right end of the resistor R9 is connected with GND; the left end of the resistor R10 is connected with the IN 1-end of the operational amplifier chip E, and the right end of the resistor R10 is connected with VCC; the left end of the resistor R11 is connected with the OUT1 end of the operational amplifier chip E, and the right end of the resistor R11 is connected with VCC; the positive end of the diode D2 is connected with the OUT1 end of the operational amplifier chip E, and the negative end of the diode D2 is connected with the negative end of the diode D3; the positive terminal of the diode D3 is connected with the OUT2 terminal of the operational amplifier chip E; the upper end of the resistor R16 is connected with the negative electrode end of the diode D3, and the lower end of the resistor R16 is connected with GND; the G end of the MOS transistor Q1 is connected with the positive end of the triode D3, the S end is connected with VCC, and the D end is connected with the power amplifier 1 to provide grid voltage for the power amplifier.
As shown in fig. 5, in the present embodiment, the power amplifier 1 is a radio frequency signal power amplifier, and the gate voltage input terminal of the power amplifier 1 is connected to the drain of the MOS transistor of the comparison and determination circuit 4.
The utility model discloses the theory of operation of device: the radio frequency power amplifier is connected with the current detection circuit in parallel, the core part of the current detection circuit adopts a current detection chip LM3824, when the current to be detected flows to a load through an internal resistor, a voltage drop with proportional current is generated on the resistor, the voltage drop is output after being sampled and converted by a modulator, then an operational amplifier circuit is adopted to properly amplify the output voltage value of the current detection circuit, and the amplified voltage value is compared and judged with a preset threshold value of a comparison and judgment circuit; the radio frequency amplifier is arranged near the temperature detection circuit, the temperature constant sensor is of an LM35 type, LM35 monitors the working temperature of the power amplifier in real time, the output voltage is increased by 10mV when the temperature rises by 1 ℃, and similarly, the output voltage of the temperature detection circuit is properly amplified by the operational amplifier circuit to the output voltage value of the current detection circuit and is compared and judged with a preset threshold value of the comparison and judgment circuit; the comparison and judgment circuit consists of a comparator LM358, a logic OR gate formed by diodes and a threshold setting resistor, the working current and the temperature of the power amplifier are compared and judged with the preset threshold of the comparator, and the comparison and judgment result is subjected to logic OR operation.
The utility model provides a thought and method of radio frequency power amplifier automatic safety device, the method and the way that specifically realize this technical scheme are many, above only the utility model discloses a preferred embodiment should point out, to the ordinary technical personnel in this technical field, is not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improvements should also be regarded as with moist decorations the utility model discloses a protection scope. All the components not specified in the present embodiment can be realized by the prior art.
Claims (5)
1. An automatic protection device of a radio frequency power amplifier is characterized by comprising a power amplifier (1), a current detection circuit (2), a temperature detection circuit (3) and a comparison judgment circuit (4);
the power amplifier (1) is respectively connected with the current detection circuit (2) and the temperature detection circuit (3), the current detection circuit (2) and the temperature detection circuit (3) are connected with the comparison and judgment circuit (4), and the comparison and judgment circuit (4) is connected with the power amplifier (1).
2. The automatic protection device for radio frequency power amplifier according to claim 1, wherein the power amplifier (1) is a radio frequency signal power amplifier, the power amplifier is connected in parallel with the input end VIN of the current detection circuit (2), and the power amplifier is disposed near the temperature sensing chip a of the temperature detection circuit (3).
3. The automatic protection device of the radio frequency power amplifier according to claim 2, characterized in that the current detection circuit (2) comprises an input terminal VIN, an output terminal V-OUT, a current detection chip C, an operational amplifier chip D, a zener diode D1, a capacitor C1, a capacitor C2, a resistor R5, a resistor R6, a resistor R7, and a variable resistor VR 2; the input end VIN is connected with the upper end of a voltage stabilizing diode D1; the upper end of the voltage-stabilizing diode D1 is connected with the upper end of the capacitor C1, and the lower end of the voltage-stabilizing diode D1 is connected with the upper end of the resistor R5; the upper end of the resistor R5 is connected with the TEST end of the current detection chip C, and the lower end of the resistor R5 is connected with GND; the upper end of the capacitor C1 is connected with the SENSE + end of the current detection chip C, and the lower end of the capacitor C1 is connected with the GND end and the TEST end of the current detection chip C; the upper end of the capacitor C2 is connected with the FLTR + end of the current detection chip C, and the lower end of the capacitor C2 is connected with the FLTR-end; the upper end of the resistor R6 is connected with GND, and the lower end of the resistor R6 is connected with the SENSE-end of the current detection chip C; the IN + end of the operational amplifier chip is connected with the PWM end of the current detection chip, the IN-end is connected with the upper end of a resistor R7, the V end is connected with VCC, the G end is connected with GND, and the OUT end is connected with the middle end, the upper end and the output end V-OUT of a variable resistor VR 2; the lower end of the variable resistor VR2 is connected with the upper end of the resistor R7; the lower end of the resistor R7 is connected with GND; and the output end V-OUT is connected with the input end V-IN of the comparison and judgment circuit (4).
4. The automatic protection device of radio frequency power amplifier according to claim 3, characterized in that the temperature detection circuit (3) comprises a temperature sensing chip A, an operational amplifier chip B, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a variable resistor VR 1; the VCC end of the temperature sensing chip A is connected with VCC, the GND end is connected with GND, and the OUT end is connected with the lower end of a resistor R1; the upper end of the resistor R1 is connected with VCC; the left end of the resistor R2 is connected with the lower end of the resistor R1, and the right end of the resistor R2 is connected with the IN-end of the operational amplifier chip B; the left end of the resistor R3 is connected with GND, and the right end of the resistor R3 is connected with the IN + end of the operational amplifier chip B; the upper end of the resistor R4 is connected with the OUT end of the operational amplifier chip and the lower end is connected with the IN-end of the operational amplifier chip; the adjusting end of the variable resistor VR1 is connected with the V + end of the operational amplifier chip B, the left end of the variable resistor VR1 is connected with the OS end of the operational amplifier chip B, and the TAB end of the operational amplifier chip B is connected with the right end of the variable resistor VR 1; the V + end of the operational amplifier chip B is connected with VCC, the V-end is connected with GND, and the OUT end is connected with the output end T-OUT end; and the output end T-OUT is connected with the input end T-IN of the comparison and judgment circuit (4).
5. The automatic protection device of the radio frequency power amplifier according to claim 4, wherein the comparing and determining circuit (4) comprises an input terminal V-IN, an input terminal T-IN, an operational amplifier chip E, a MOS transistor Q1, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a diode D2, a diode D3; the left end of the resistor R12 is connected with the left end of the resistor R14, and the right end of the resistor R12 is connected with the IN2+ end of the operational amplifier chip E; the left end of the resistor R13 is connected with GND, and the right end of the resistor R13 is connected with the IN 2-end of the operational amplifier chip E; the left end of the resistor R14 is connected with VCC, and the right end of the resistor R14 is connected with the IN 2-end of the operational amplifier chip E; the left end of the resistor R15 is connected with VCC, and the right end of the resistor R15 is connected with the OUT2 end of the operational amplifier chip E; the left end of the resistor R8 is connected with the IN1+ end of the operational amplifier chip E, and the right end of the resistor R10 is connected with the right end of the operational amplifier chip E; the left end of the resistor R9 is connected with the IN 1-end of the operational amplifier chip E, and the right end of the resistor R9 is connected with GND; the left end of the resistor R10 is connected with the IN 1-end of the operational amplifier chip E, and the right end of the resistor R10 is connected with VCC; the left end of the resistor R11 is connected with the OUT1 end of the operational amplifier chip E, and the right end of the resistor R11 is connected with VCC; the positive end of the diode D2 is connected with the OUT1 end of the operational amplifier chip E, and the negative end of the diode D2 is connected with the negative end of the diode D3; the positive terminal of the diode D3 is connected with the OUT2 terminal of the operational amplifier chip E; the upper end of the resistor R16 is connected with the negative electrode end of the diode D3, and the lower end of the resistor R16 is connected with GND; the G end of the MOS transistor Q1 is connected with the positive end of the triode D3, the S end is connected with VCC, and the D end is connected with the power amplifier (1) to provide grid voltage for the power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021452114.7U CN212935852U (en) | 2020-07-22 | 2020-07-22 | Automatic protection device for radio frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021452114.7U CN212935852U (en) | 2020-07-22 | 2020-07-22 | Automatic protection device for radio frequency power amplifier |
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| Publication Number | Publication Date |
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| CN212935852U true CN212935852U (en) | 2021-04-09 |
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| CN202021452114.7U Active CN212935852U (en) | 2020-07-22 | 2020-07-22 | Automatic protection device for radio frequency power amplifier |
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