Detection and alarm circuit for frequency band wrong selection of radio frequency power amplifier

Abstract

The utility model provides a detection alarm circuit used for frequency band wrong selection of a radio frequency power amplifier, comprising a consumption detection module used for detecting consumption current of the radio frequency power amplifier and converting the consumption current into a voltage value IV; the fixed coupling detection module is used for carrying out fixed coupling detection on the output end of the radio frequency power amplifier; the primary comparison module is used for comparing the voltage value IV output by the consumption detection module with a preset threshold voltage; the secondary comparison module is used for comparing the output voltage of the primary comparison module with the power detection V + of the fixed coupling detection module; the consumption detection module and the threshold voltage are respectively connected with the input end of the primary comparison module; and the output end of the primary comparison module and the output end of the fixed coupling detection module are respectively connected with the input end of the secondary comparison module. The detection alarm circuit can detect the frequency band wrong selection condition of the radio frequency power amplifier, and is beneficial for realizing the protection of the radio frequency power amplifier and preventing the radio frequency power amplifier from being damaged.

Description

Technical Field

[0001] The utility model relates to the field of radio frequency technology, and more specifically to a detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier. Background Art

[0002] The RF power amplifier is an important part of the RF communication system. Through a series of amplification processes, it amplifies the low-power RF signal generated by the modulated oscillation circuit to sufficient power so that it can be radiated through the antenna.

[0003] RF power amplifiers need to select different working frequency bands in different application scenarios. When working, when the RF power amplifier is already in the transmitting state, it consumes a lot of current. However, if the RF power amplifier selects the wrong working frequency band, then there is no power output at the output end of the RF power amplifier. At this time, all the output power is reflected inside the RF power amplifier, which can easily cause damage to the RF power amplifier. In view of this situation, a detection alarm solution needs to be designed. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and to provide a detection alarm circuit for misselection of a frequency band of a radio frequency power amplifier; the detection alarm circuit can detect the misselection of a frequency band of a radio frequency power amplifier, which is beneficial to protecting the radio frequency power amplifier and preventing damage to the radio frequency power amplifier.

[0005] In order to achieve the above object, the utility model is implemented by the following technical scheme: a detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier, comprising:

[0006] A consumption detection module for detecting the current consumed by the radio frequency power amplifier and converting the consumed current into a voltage value IV;

[0007] A fixed coupling detection module for performing fixed coupling detection on the output end of the radio frequency power amplifier;

[0008] A primary comparison module for comparing the voltage value IV output by the consumption detection module with a preset threshold voltage;

[0009] and a secondary comparison module for comparing the output voltage of the primary comparison module with the power detection V+ of the fixed coupling detection module;

[0010] The consumption detection module and the threshold voltage are respectively connected to the input end of the primary comparison module; the output end of the primary comparison module and the output end of the fixed coupling detection module are respectively connected to the input end of the secondary comparison module; the output end of the secondary comparison module is connected to the alarm signal output end.

[0011] Preferably, the primary comparison module includes an operational amplifier U1; the secondary comparison module includes an operational amplifier U2;

[0012] The output end of the consumption detection module is connected to the positive input end of the operational amplifier U1, the negative input end of the operational amplifier U1 is connected to the threshold voltage, and the output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2; the power detection V+ output end of the fixed-coupled detection module is connected to the negative input end of the operational amplifier U2, and the output end of the operational amplifier U2 is grounded through the resistor R7 and the capacitor C1; the capacitor C1 is connected in parallel with a voltage regulator VD1; the connection between the resistor R7 and the capacitor C1 is connected to the alarm signal output end.

[0013] The utility model detects and warns the circuit, and compares the voltage value IV obtained by the consumption detection module with the preset threshold voltage through the operational amplifier U1, and then compares the power detection V+ output by the fixed-coupled detection module with the preset threshold voltage through the operational amplifier U2; when the consumption current of the RF power amplifier is very large and the power detection V+ is very small, an alarm signal is output, and the alarm situation can be processed subsequently, such as shutting down the RF power amplifier in time, which is conducive to protecting the RF power amplifier and preventing the RF power amplifier from being damaged.

[0014] Preferably, it also includes a recovery module; the recovery module includes a transistor VQ1, a diode VD2 and a resistor R9; the base of the transistor VQ1 is connected to the recovery signal input terminal; the emitter of the transistor VQ1 is grounded; the collector of the transistor VQ1 is connected to the positive input terminal of the operational amplifier U2 through the diode VD2; the collector of the transistor VQ1 is also connected to the output terminal of the operational amplifier U2 through the resistor R9.

[0015] Preferably, the anode of the diode VD2 is connected to the collector of the transistor VQ1; the cathode of the diode VD2 is connected to the positive input terminal of the operational amplifier U2.

[0016] By inputting a recovery signal through the recovery module, the alarm state can be released, so that the detection alarm circuit can continue to detect the RF power amplifier.

[0017] Preferably, the output end of the consumption detection module is connected to the positive input end of the operational amplifier U1 through a resistor R1; the threshold voltage is connected to the negative input end of the operational amplifier U1 through a resistor R2; and the connection between the resistor R2 and the negative input end of the operational amplifier U1 is grounded through a resistor R3.

[0018] Preferably, the output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2 through a resistor R4; the power detection V+ output end of the fixed coupling detection module is connected to the negative input end of the operational amplifier U2 through a resistor R5; and the connection between the resistor R5 and the negative input end of the operational amplifier U2 is grounded through a resistor R6.

[0019] Preferably, the connection point between the resistor R7 and the capacitor C1 is connected to the alarm signal output terminal through the resistor R7.

[0020] Preferably, the voltage regulator tube VD1 is a voltage regulator tube with a voltage regulation voltage of 3V.

[0021] Preferably, the consumption detection module comprises a current detector for detecting the current consumed by the radio frequency power amplifier.

[0022] Preferably, the current detector is arranged on an input power line of a power supply module of the radio frequency power amplifier; and can be accurately

[0023] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0024] The utility model aims at the situation where the frequency band of the RF power amplifier is wrongly selected. When the current consumption of the RF power amplifier is very large and the power detection V+ is very small, an alarm signal is output. The alarm situation can be processed subsequently, which is conducive to protecting the RF power amplifier and preventing the RF power amplifier from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a system block diagram of a detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to the utility model;

[0026] Figure 2 The utility model is a circuit principle diagram of a detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementations.

[0028] Example

[0029] This embodiment is a detection alarm circuit for wrong selection of frequency band of a radio frequency power amplifier, such as Figure 1 As shown, including:

[0030] A consumption detection module for detecting the current consumed by the radio frequency power amplifier and converting the consumed current into a voltage value IV;

[0031] A fixed coupling detection module for performing fixed coupling detection on the output end of the radio frequency power amplifier;

[0032] A primary comparison module for comparing the voltage value IV output by the consumption detection module with a preset threshold voltage;

[0033] and a secondary comparison module for comparing the output voltage of the primary comparison module with the power detection V+ of the fixed coupling detection module;

[0034] The consumption detection module and the threshold voltage are respectively connected to the input end of the primary comparison module; the output end of the primary comparison module and the output end of the fixed coupling detection module are respectively connected to the input end of the secondary comparison module; the output end of the secondary comparison module is connected to the alarm signal output end.

[0035] Specifically, the consumption detection module includes a current detector for detecting the current consumption of the RF power amplifier. The current detector is arranged on the input power line of the power supply module of the RF power amplifier. The current detector can adopt an existing device; the method of converting the consumption current into a voltage value IV can adopt existing technology. The fixed coupling detection module can adopt existing technology.

[0036] like Figure 2 As shown, the primary comparison module includes an operational amplifier U1; the secondary comparison module includes an operational amplifier U2. The output end of the consumption detection module is connected to the positive input end of the operational amplifier U1, the negative input end of the operational amplifier U1 is connected to the threshold voltage, and the output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2; the power detection V+ output end of the fixed coupling detection module is connected to the negative input end of the operational amplifier U2, and the output end of the operational amplifier U2 is grounded through the resistor R7 and the capacitor C1; the capacitor C1 is connected in parallel with a voltage regulator VD1; the connection between the resistor R7 and the capacitor C1 is connected to the alarm signal output end.

[0037] The output end of the consumption detection module is connected to the positive input end of the operational amplifier U1 through the resistor R1; the threshold voltage is connected to the negative input end of the operational amplifier U1 through the resistor R2; the connection between the resistor R2 and the negative input end of the operational amplifier U1 is grounded through the resistor R3. The output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2 through the resistor R4; the power detection V+ output end of the fixed coupling detection module is connected to the negative input end of the operational amplifier U2 through the resistor R5; the connection between the resistor R5 and the negative input end of the operational amplifier U2 is grounded through the resistor R6. The connection between the resistor R7 and the capacitor C1 is connected to the alarm signal output end through the resistor R7. The voltage regulator VD1 refers to a voltage regulator with a voltage regulation voltage of 3V.

[0038] The preferred solution is: further including a recovery module; the recovery module includes a transistor VQ1, a diode VD2 and a resistor R9; the base of the transistor VQ1 is connected to the recovery signal input terminal; the emitter of the transistor VQ1 is grounded; the collector of the transistor VQ1 is connected to the positive input terminal of the operational amplifier U2 through the diode VD2; the collector of the transistor VQ1 is also connected to the output terminal of the operational amplifier U2 through the resistor R9. The anode of the diode VD2 is connected to the collector of the transistor VQ1; and the cathode of the diode VD2 is connected to the positive input terminal of the operational amplifier U2.

[0039] The utility model detects and warns the circuit, and compares the voltage value IV obtained by the consumption detection module with the preset threshold voltage through the operational amplifier U1, and then compares the power detection V+ output by the fixed-coupled detection module with the preset threshold voltage through the operational amplifier U2; when the consumption current of the RF power amplifier is very large and the power detection V+ is very small, an alarm signal is output, and the alarm situation can be processed subsequently, such as shutting down the RF power amplifier in time, which is conducive to protecting the RF power amplifier and preventing the RF power amplifier from being damaged.

[0040] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier, characterized in that: include: A consumption detection module for detecting the current consumed by the radio frequency power amplifier and converting the consumed current into a voltage value IV; A fixed coupling detection module for performing fixed coupling detection on the output end of the radio frequency power amplifier; A primary comparison module for comparing the voltage value IV output by the consumption detection module with a preset threshold voltage; and a secondary comparison module for comparing the output voltage of the primary comparison module with the power detection V+ of the fixed coupling detection module; The consumption detection module and the threshold voltage are respectively connected to the input end of the primary comparison module; the output end of the primary comparison module and the output end of the fixed coupling detection module are respectively connected to the input end of the secondary comparison module; the output end of the secondary comparison module is connected to the alarm signal output end.

2. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 1, characterized in that: The primary comparison module includes an operational amplifier U1; the secondary comparison module includes an operational amplifier U2; The output end of the consumption detection module is connected to the positive input end of the operational amplifier U1, the negative input end of the operational amplifier U1 is connected to the threshold voltage, and the output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2; the power detection V+ output end of the fixed-coupled detection module is connected to the negative input end of the operational amplifier U2, and the output end of the operational amplifier U2 is grounded through the resistor R7 and the capacitor C1; the capacitor C1 is connected in parallel with a voltage regulator VD1; the connection between the resistor R7 and the capacitor C1 is connected to the alarm signal output end.

3. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 2, characterized in that: It also includes a recovery module; the recovery module includes a transistor VQ1, a diode VD2 and a resistor R9; the base of the transistor VQ1 is connected to the recovery signal input terminal; the emitter of the transistor VQ1 is grounded; the collector of the transistor VQ1 is connected to the positive input terminal of the operational amplifier U2 through the diode VD2; the collector of the transistor VQ1 is also connected to the output terminal of the operational amplifier U2 through the resistor R9.

4. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 3, characterized in that: The anode of the diode VD2 is connected to the collector of the transistor VQ1; the cathode of the diode VD2 is connected to the positive input terminal of the operational amplifier U2.

5. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 2, characterized in that: The output end of the consumption detection module is connected to the positive input end of the operational amplifier U1 through a resistor R1; the threshold voltage is connected to the negative input end of the operational amplifier U1 through a resistor R2; and the connection between the resistor R2 and the negative input end of the operational amplifier U1 is grounded through a resistor R3.

6. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 2, characterized in that: The output end of the operational amplifier U1 is connected to the positive input end of the operational amplifier U2 through the resistor R4; the power detection V+ output end of the fixed coupling detection module is connected to the negative input end of the operational amplifier U2 through the resistor R5; the connection between the resistor R5 and the negative input end of the operational amplifier U2 is grounded through the resistor R6.

7. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 2, characterized in that: The connection point between the resistor R7 and the capacitor C1 is connected to the alarm signal output terminal through the resistor R7.

8. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 2, characterized in that: The voltage regulator tube VD1 is a voltage regulator tube with a voltage regulation voltage of 3V.

9. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to any one of claims 1 to 8, characterized in that: The consumption detection module includes a current detector for detecting the current consumed by the radio frequency power amplifier.

10. The detection alarm circuit for wrong frequency band selection of a radio frequency power amplifier according to claim 9, characterized in that: The current detector is arranged on the input power line of the power supply module of the radio frequency power amplifier.

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