Antenna tuner power-on detection device

Abstract

The invention belongs to the technical field of shortwave communication equipment application, and discloses an antenna tuner power-on detection device, which comprises: a window voltage comparison unit, a low current detection unit, a detection control unit, a power-on switching unit and an antenna tuner power supply unit; a signal output end of the window voltage comparison unit is connected to a first signal input end arranged on the detection control unit, a signal output end of the low current comparison unit is connected to a second signal input end arranged on the detection control unit, a signal output end of the detection control unit is connected to a control signal input end of the power-on switching unit, a voltage output end of the antenna tuner power supply unit is connected to a voltage input end of the power-on switching unit, and a voltage output end of the power-on switching unit is connected to a voltage input end of the antenna tuner, so that the antenna tuner power supply function can be effectively realized and safety requirements can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of shortwave communication equipment application, and in particular relates to a power-on detection device for an antenna tuner. Background Art

[0002] The frequency band of shortwave radio is wide. In order to transmit energy through the antenna with maximum efficiency, an antenna tuner (hereinafter referred to as antenna tuner) needs to be installed between the radio transmitter and the antenna to achieve impedance matching. The antenna tuner is usually powered by 24V. Using an external power supply requires additional resources. The usual practice is for the shortwave radio to directly power the radio through the shared RF output interface. However, in actual use, such a circuit often has a 24V interface. When the antenna tuner is disconnected, the interface is exposed, which can easily cause safety hazards. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide an antenna tuner power-on detection device, which completes the switching of the antenna tuner power supply by judging the connection status of the antenna tuner. When the antenna tuner is connected, 24V power supply is provided, and when the antenna tuner is disconnected, the 24V power supply is cut off, which can effectively realize the antenna tuner power supply function and meet the safety requirements.

[0004] In order to achieve the above object, the present invention adopts the following technical solution to achieve it.

[0005] An antenna tuner power-on detection device, the device comprising:

[0006] Window voltage comparison unit, low current detection unit, detection control unit, power-on switching unit and antenna tuner power supply unit;

[0007] The signal output end of the window voltage comparison unit is connected to the first signal input end provided on the detection control unit, the signal output end of the low current comparison unit is connected to the second signal input end provided on the detection control unit, the signal output end of the detection control unit is connected to the control signal input end of the power-on switching unit, the voltage output end of the antenna tuner power supply unit is connected to the voltage input end of the power-on switching unit, and the voltage output end of the power-on switching unit is connected to the voltage input end of the antenna tuner.

[0008] The characteristics and further improvements of the technical solution of the present invention are:

[0009] (1) The window voltage comparison unit is used to detect the impedance of the antenna tuner, so as to obtain the antenna tuner voltage corresponding to the impedance of the antenna tuner; and when the antenna tuner voltage is within a preset voltage range, the window voltage comparison unit outputs a high level 1, and when the antenna tuner voltage is not within the preset voltage range, the window voltage comparison unit outputs a low level 0;

[0010] The low current detection unit is used to detect the antenna tuner current passing through the antenna tuner; and when the antenna tuner current is less than or equal to a preset current threshold, the low current detection unit outputs a high level 1, and when the antenna tuner current is greater than the preset current threshold, the low current detection unit outputs a low level 0;

[0011] The detection control unit is used to control the state of the power-on switching unit according to the level state output by the window voltage comparison unit and the level state output by the low current detection unit, and the state of the power-on switching unit includes: connecting the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner, disconnecting the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner, and maintaining the current state.

[0012] (2) When the antenna tuner voltage is within the preset voltage range and the window voltage comparison unit outputs a high level 1, it indicates that the output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are connected but power supply is not completed;

[0013] When the antenna tuner voltage is not within the preset voltage range and the window voltage comparison unit outputs a low level 0, it indicates that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are in a connected state and power supply has been completed, or that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are in a disconnected state;

[0014] When the antenna tuner current is less than or equal to the preset current threshold, and the low current detection unit outputs a high level 1, it indicates that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are disconnected, or that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are connected but power supply is not completed;

[0015] When the antenna tuner current is greater than the preset current threshold and the low current detection unit outputs a low level 0, it indicates that the antenna tuner power supply unit is connected to the voltage input terminal of the antenna tuner and the power supply is completed.

[0016] (3) The detection control unit is used to control the state of the power-on switching unit according to the level state output by the window voltage comparison unit and the level state output by the low current detection unit, specifically including:

[0017] When the window voltage comparison unit outputs a high level 1 and the low current detection unit outputs a high level 1, the detection control unit controls the power-on switching unit to connect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner without supplying power;

[0018] When the window voltage comparison unit outputs a high level 1 and the low current detection unit outputs a low level 0, the detection control unit controls the power-on switching unit to connect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner and complete the power supply;

[0019] When the window voltage comparison unit outputs a low level 0 and the low current detection unit outputs a low level 0, the detection control unit controls the power-on switching unit to maintain a current state;

[0020] When the window voltage comparison unit outputs a low level 0 and the low current detection unit outputs a high level 1, the detection control unit controls the power-on switching unit to disconnect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner.

[0021] Compared with the existing method of directly outputting 24V electricity from the RF output port to complete the antenna tuner power supply, the antenna tuner power-on detection circuit can effectively avoid the safety hazard of 24V exposure and effectively complete the antenna tuner power supply task. At the same time, the antenna tuner power-on detection circuit is a self-contained system, convenient for modularization, and has the characteristics of simple circuit, reliable performance, high degree of integration and easy debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a power-on detection device for an antenna tuner provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The embodiment of the present invention provides an antenna tuner power-on detection device, such as Figure 1 As shown, the device includes: a window voltage comparison unit, a low current detection unit, a detection control unit, a power-on switching unit and an antenna tuner power supply unit;

[0026] The signal output end of the window voltage comparison unit is connected to the first signal input end provided on the detection control unit, the signal output end of the low current comparison unit is connected to the second signal input end provided on the detection control unit, the signal output end of the detection control unit is connected to the control signal input end of the power-on switching unit, the voltage output end of the antenna tuner power supply unit is connected to the voltage input end of the power-on switching unit, and the voltage output end of the power-on switching unit is connected to the voltage input end of the antenna tuner.

[0027] Wherein, the window voltage comparison unit is used to detect the impedance of the antenna tuner, so as to obtain the antenna tuner voltage corresponding to the impedance of the antenna tuner; and when the antenna tuner voltage is within the preset voltage range, the window voltage comparison unit outputs a high level 1, and when the antenna tuner voltage is not within the preset voltage range, the window voltage comparison unit outputs a low level 0;

[0028] The low current detection unit is used to detect the antenna tuner current passing through the antenna tuner; and when the antenna tuner current is less than or equal to a preset current threshold, the low current detection unit outputs a high level 1, and when the antenna tuner current is greater than the preset current threshold, the low current detection unit outputs a low level 0;

[0029] The detection control unit is used to control the state of the power-on switching unit according to the level state output by the window voltage comparison unit and the level state output by the low current detection unit, and the state of the power-on switching unit includes: connecting the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner, disconnecting the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner, and maintaining the current state.

[0030] Specifically, when the antenna tuner voltage is within a preset voltage range and the window voltage comparison unit outputs a high level 1, it indicates that the output end of the antenna tuner power supply unit is connected to the voltage input end of the antenna tuner but power supply is not completed;

[0031] When the antenna tuner voltage is not within the preset voltage range and the window voltage comparison unit outputs a low level 0, it indicates that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are in a connected state and power supply has been completed, or that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are in a disconnected state;

[0032] When the antenna tuner current is less than or equal to the preset current threshold, and the low current detection unit outputs a high level 1, it indicates that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are disconnected, or that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are connected but power supply is not completed;

[0033] When the antenna tuner current is greater than the preset current threshold and the low current detection unit outputs a low level 0, it indicates that the antenna tuner power supply unit is connected to the voltage input terminal of the antenna tuner and the power supply is completed.

[0034] Further, the detection control unit is used to control the state of the power-on switching unit according to the level state output by the window voltage comparison unit and the level state output by the low current detection unit, specifically including:

[0035] When the window voltage comparison unit outputs a high level 1 and the low current detection unit outputs a high level 1, the detection control unit controls the power-on switching unit to connect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner without supplying power;

[0036] When the window voltage comparison unit outputs a high level 1 and the low current detection unit outputs a low level 0, the detection control unit controls the power-on switching unit to connect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner and complete the power supply;

[0037] When the window voltage comparison unit outputs a low level 0 and the low current detection unit outputs a low level 0, the detection control unit controls the power-on switching unit to maintain a current state;

[0038] When the window voltage comparison unit outputs a low level 0 and the low current detection unit outputs a high level 1, the detection control unit controls the power-on switching unit to disconnect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner.

[0039] In actual engineering implementation, the technical idea of ​​the invention is: to detect the connection status of the antenna tuner through a window voltage comparison circuit and a low current detection circuit, and then to complete the judgment through a simple logic gate circuit, and output a signal to control the relay to complete the switching operation of 24V electricity.

[0040] The circuit of the invention mainly consists of four parts: a low current detection circuit, a window voltage comparison circuit, a detection control circuit, and a power-on switching circuit.

[0041] a) The low current detection circuit determines the connection status of the antenna tuner by detecting the weak current at the output port. When the antenna tuner is connected and the 24V power supply is completed, the output low level is 0; when the antenna tuner is disconnected or connected but the 24V power supply is not completed, the output level is 1.

[0042] b) The window voltage comparison circuit uses a window comparator to determine the state of the antenna tuner. When the antenna tuner is connected but has not completed the 24V output, its own impedance participates in the voltage division, causing the detection voltage to fall into the window range of 0.64V-2.6V, and the output high level is 1; when the antenna tuner is disconnected or connected and completes the 24V power-on, the voltage falls outside the range of 0.64V-2.6V, and the output is 0.

[0043] c) The detection control circuit completes the logic judgment through the output level state of the low current detection circuit and the window voltage comparison circuit, and outputs the level to control the power-on switching circuit to complete the operation. Assume that the low current detection output is A, the window voltage comparison circuit output is B, and the detection control circuit output is C. The truth table 1 is as follows:

[0044] A B C 0 0 Status unchanged 0 1 1 1 0 0 1 1 1

[0045] d) The power-on switching circuit uses a relay to complete the switching of 24V power according to the electrical level sent by the detection control circuit. When the detection control circuit sends a high electrical level 1, the driving relay switches to 24V to power on the antenna tuner. When the detection control circuit sends a low electrical level 0, the relay operates to disconnect the 24V power supply.

[0046] e) When the local tuner is in the disconnected state, the low current detection circuit cannot detect the current and the output is high 1. The voltage entering the window comparator is not within the window range of 0.64V-2.6V, and the output is low level 0. The detection control circuit makes a logical judgment and the output is 0. The relay does not work and 24V is not output.

[0047] f) When the A / D is connected but 24V is not turned on, the low current detection circuit detects the current, but the current is too small, and the output is still high level 1. The window voltage comparison circuit enters the window voltage due to the voltage division of the A / D, and the output is high 1. The detection control circuit outputs high 1, and the driving relay completes the switching, and 24V is output.

[0048] g) When the antenna is connected and 24V is just turned on, the low current detection circuit detects the current and outputs a low level of 0. The window voltage comparison circuit falls out of the window and the output should be 0. The level changes from high to low, resulting in the output of high level 1 being maintained for a period of time. The output of the detection control circuit is still not 1, and the 24V output is maintained. When the window voltage comparison circuit stably outputs 0, the output state of the detection control circuit remains unchanged, still high level 1, 24V stable output, and the antenna works stably.

[0049] h) When the air conditioner is disconnected, there is no current in the power supply path, the output of the low current detection circuit quickly flips to high level 1, the detection voltage is not within the window range, the window voltage comparison circuit output is low level 0, the detection control circuit output is low level 0, the relay switches, and the 24V is disconnected.

[0050] i) After actual verification, the circuit can effectively complete the task of antenna tuner detection and power-on. When the antenna tuner is disconnected, there is no 24V output. When the antenna tuner is connected, 24V is output stably.

[0051] Compared with the antenna tuner power supply that is completed by directly outputting 24V electricity from the RF output port, the antenna tuner power-on detection circuit can effectively avoid the potential safety hazard of 24V exposure and effectively complete the antenna tuner power supply task. At the same time, the antenna tuner power-on detection circuit is a self-contained system, convenient for modularization, and has the characteristics of simple circuit, reliable performance, high degree of integration and easy debugging.

[0052] A person of ordinary skill in the art can understand that all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, etc., various media that can store program codes.

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An antenna tuner detection power-on device, characterized in that: The device comprises: Window voltage comparison unit, low current detection unit, detection control unit, power-on switching unit and antenna tuner power supply unit; The signal output end of the window voltage comparison unit is connected to the first signal input end provided on the detection control unit, the signal output end of the low current detection unit is connected to the second signal input end provided on the detection control unit, the signal output end of the detection control unit is connected to the control signal input end of the power-on switching unit, the voltage output end of the antenna tuner power supply unit is connected to the voltage input end of the power-on switching unit, and the voltage output end of the power-on switching unit is connected to the voltage input end of the antenna tuner; The window voltage comparison unit is used to detect the impedance of the antenna tuner, so as to obtain the antenna tuner voltage corresponding to the impedance of the antenna tuner; and when the antenna tuner voltage is within a preset voltage range, the window voltage comparison unit outputs a high level 1, and when the antenna tuner voltage is not within the preset voltage range, the window voltage comparison unit outputs a low level 0; The low current detection unit is used to detect the antenna tuner current passing through the antenna tuner; and when the antenna tuner current is less than or equal to a preset current threshold, the low current detection unit outputs a high level 1, and when the antenna tuner current is greater than the preset current threshold, the low current detection unit outputs a low level 0; The detection control unit is used to control the state of the power-on switching unit according to the level state output by the window voltage comparison unit and the level state output by the low current detection unit, and the state of the power-on switching unit includes: connecting the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner, disconnecting the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner, and maintaining the current state; When the antenna tuner voltage is within the preset voltage range and the window voltage comparison unit outputs a high level 1, it indicates that the output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are connected but power supply is not completed; When the antenna tuner voltage is not within the preset voltage range and the window voltage comparison unit outputs a low level 0, it indicates that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are in a connected state and power supply has been completed, or that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are in a disconnected state; When the antenna tuner current is less than or equal to the preset current threshold, and the low current detection unit outputs a high level 1, it indicates that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are disconnected, or that the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner are connected but power supply is not completed; When the antenna tuner current is greater than the preset current threshold and the low current detection unit outputs a low level 0, it indicates that the antenna tuner power supply unit is connected to the voltage input terminal of the antenna tuner and the power supply has been completed; The detection control unit is used to control the state of the power-on switching unit according to the level state output by the window voltage comparison unit and the level state output by the low current detection unit, specifically including: When the window voltage comparison unit outputs a high level 1 and the low current detection unit outputs a high level 1, the detection control unit controls the power-on switching unit to connect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner without supplying power; When the window voltage comparison unit outputs a high level 1 and the low current detection unit outputs a low level 0, the detection control unit controls the power-on switching unit to connect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner and complete the power supply; When the window voltage comparison unit outputs a low level 0 and the low current detection unit outputs a low level 0, the detection control unit controls the power-on switching unit to maintain a current state; When the window voltage comparison unit outputs a low level 0 and the low current detection unit outputs a high level 1, the detection control unit controls the power-on switching unit to disconnect the voltage output end of the antenna tuner power supply unit and the voltage input end of the antenna tuner.

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