Relay amplifier

Abstract

The utility model relates to the technical field of amplifiers, in particular to a relay amplifier, which comprises a receiving module, an amplifying module and a transmitting module, the amplifying module comprises a selection circuit and an amplifying circuit, the receiving module is respectively connected with the input end of the selection circuit and one input end of the amplifying circuit, and the transmitting module is connected with the output end of the amplifying circuit; and the selection circuit is connected with the amplification circuit. The selection circuit rectifies and stabilizes the alternating current signal received by the receiving module into a direct current signal in real time, and judges the signal quality through a comparator, so as to control a switch assembly in the amplification circuit to switch the channel of the amplification circuit; in the amplification circuit, the negative input end of the first-stage amplifier, the positive input end of the first-stage amplifier, the negative input end of the second-stage amplifier and the output end of the second-stage amplifier are connected, phase advance is avoided, stability is enhanced, and self-oscillation is prevented. The relay amplifier solves the technical problem that a traditional relay amplifier is difficult to ensure signal stability in different wireless signal environments.

Description

Technical Field

[0001] The utility model relates to the technical field of amplifiers, in particular to a relay amplifier. Background Art

[0002] Repeater amplifiers, key equipment in the communications field, amplify received signals and forward them over long distances. This significantly expands signal coverage and improves transmission efficiency. However, traditional repeaters often experience natural signal attenuation during long-distance transmission or when encountering obstacles, resulting in limited coverage, reduced signal quality, and even loss of reception in certain areas. Therefore, addressing signal attenuation during long-distance transmission and when encountering obstacles, and ensuring stable signal transmission, is crucial.

[0003] The currently published patent is a Chinese invention patent named "A Computer WIFI Signal Relay Amplifier" with publication number CN105978618B. This patent adopts a multi-stage amplification method, which amplifies the signal through multiple amplification circuits in sequence, effectively expanding the signal range. However, this utility model cannot adjust the output signal. In different wireless signal environments, the fixed gain parameters can easily lead to unstable or distorted signal quality, thereby affecting the communication effect. Utility Model Content

[0004] The purpose of the present application is to provide a relay amplifier that solves the technical problem that traditional relay amplifiers are difficult to ensure signal stability in different wireless signal environments.

[0005] technical issues.

[0006] In order to solve the above technical problems, the solution adopted by this application is as follows:

[0007] The utility model provides a relay amplifier, comprising a receiving module, an amplifying module, and a transmitting module, wherein the amplifying module is connected to the receiving module and the transmitting module respectively, and is characterized in that: the amplifying module comprises a selection circuit and an amplifying circuit, the receiving module is connected to an input end of the selection circuit and an input end of the amplifying circuit respectively, the transmitting module is connected to an output end of the amplifying circuit; the selection circuit is connected to the amplifying circuit;

[0008] The selection circuit includes a rectifier circuit, a voltage stabilizing circuit, and a comparison circuit. The input end of the rectifier circuit serves as the input end of the selection circuit, and the output end of the rectifier circuit is connected to the input end of the comparison circuit through the voltage stabilizing circuit; the output end of the comparison circuit is set as the output end of the selection circuit;

[0009] The amplifier circuit includes a first-stage amplifier, a second-stage amplifier, and a switch component. The positive input terminal of the first-stage amplifier serves as an input terminal of the amplifier circuit, and the first-stage amplifier is connected to the positive input terminal of the second-stage amplifier through the switch component. The negative input terminal of the first-stage amplifier, the negative input terminal of the second-stage amplifier, and the output terminal of the second-stage amplifier are connected. The output terminal of the second-stage amplifier serves as the output terminal of the amplifier circuit.

[0010] The switch component includes a first field effect transistor, a second field effect transistor, and a NOT gate. The drain of the first field effect transistor is connected to the output end of the first-stage amplifier, the source of the first field effect transistor, the drain of the second field effect transistor, and the positive input end of the second-stage amplifier are connected, the gate of the first field effect transistor is connected to the output end of the NOT gate, the input end of the NOT gate is connected to the gate of the second field effect transistor, and an input end connected to the selection circuit is set here; the source of the second field effect transistor is connected to the output end of the second-stage amplifier.

[0011] In some embodiments, the voltage stabilizing circuit includes a first triode, a second triode, a third triode, a polarized capacitor, a diode, and multiple resistors. The base of the first triode, the positive electrode of the polarized capacitor, and the collector of the third triode are connected. The collector of the first triode is connected to the base of the first triode through a resistor, and an input end connected to the rectifier circuit is provided here; the collector of the second triode is connected to the collector of the first triode, the emitter of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the base of the third triode and the emitter of the third triode through different resistors, and the base of the third triode is connected to the emitter of the third triode through the diode.

[0012] In some embodiments, the voltage stabilizing circuit further includes a filter capacitor, and the filter capacitor is arranged at the input end of the voltage stabilizing circuit.

[0013] In some embodiments, the filter capacitor is a polarized capacitor.

[0014] In some embodiments, the rectifier circuit is a diode rectifier bridge.

[0015] In some embodiments, the switch component further includes a first voltage follower, and the source of the second field effect transistor is connected to the output end of the secondary amplifier through the first voltage follower.

[0016] In some embodiments, the selection circuit further includes a second voltage follower, the output end of the second voltage follower is connected to the input end of the rectifier circuit, and the input end of the second voltage follower serves as the input end of the selection circuit.

[0017] The technical solution of this application has at least the following advantages and beneficial effects:

[0018] The amplification module in the present invention includes an amplification circuit and a selection circuit. The selection circuit rectifies and stabilizes the AC signal received by the receiving module into a DC signal in real time, and judges the signal quality through a comparator, thereby controlling the switch component in the amplification circuit to switch the amplification circuit channel and optimize the output signal, thereby solving the technical problem that traditional relay amplifiers are difficult to ensure signal stability in different wireless signal environments; in the amplification circuit, the negative input end of the first-stage amplifier, the positive input end of the first-stage amplifier, the negative input end of the second-stage amplifier, and the output end of the second-stage amplifier are connected, avoiding phase advance while enhancing stability, preventing self-oscillation, and ensuring accurate and reliable signal amplification processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the amplification circuit diagram of the utility model;

[0020] Figure 2 This is the selection circuit diagram of the utility model. DETAILED DESCRIPTION

[0021] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. Terms such as "center," "upper," "lower," "inner," and "outer" indicate positions or locations based on the positions or locations shown in the figures, or the positions or locations in which the product is typically placed when in use. These terms are used solely for ease of description and simplification of the present application. They do not indicate or imply that the device or component referred to must have a specific position, be constructed, or operate in a specific orientation, and are not to be construed as limiting the present application. It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "mounted," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections or indirect connections through an intermediary; or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application in specific contexts.

[0023] Example 1

[0024] Please refer to Figure 1-Figure 2 The utility model provides a relay amplifier, which is the same as the existing technology, including a receiving module, an amplifying module, and a transmitting module. The amplifying module is connected to the receiving module and the transmitting module respectively; the receiving module converts the received wireless signal into an AC signal and transmits it to the amplifying module for amplification processing. After the amplifying module completes the processing, it outputs the amplified signal to the transmitting module, which converts it into a wireless signal for transmission.

[0025] Different from the prior art, the amplification module includes a selection circuit and an amplification circuit, the receiving module is connected to the input end of the selection circuit and one input end of the amplification circuit respectively, and the transmitting module is connected to the output end of the amplification circuit; the selection circuit is connected to the amplification circuit.

[0026] The amplifier circuit includes a first-stage amplifier, a second-stage amplifier, and a switch component. The positive input terminal of the first-stage amplifier serves as an input terminal of the amplifier circuit, and the first-stage amplifier is connected to the positive input terminal of the second-stage amplifier through the switch component. The negative input terminal of the first-stage amplifier, the negative input terminal of the second-stage amplifier, and the output terminal of the second-stage amplifier are connected. The output terminal of the second-stage amplifier serves as the output terminal of the amplifier circuit.

[0027] The switch assembly includes a first field-effect transistor, a second field-effect transistor, and a NOT gate. The drain of the first field-effect transistor is connected to the output of the first-stage amplifier, the source of the first field-effect transistor, the drain of the second field-effect transistor, and the positive input of the second-stage amplifier are connected, the gate of the first field-effect transistor is connected to the output of the NOT gate, the input of the NOT gate is connected to the gate of the second field-effect transistor, and an input connected to the selection circuit is provided there; the source of the second field-effect transistor is connected to the output of the second-stage amplifier;

[0028] The switch component further includes a first voltage follower, and the source of the second field effect transistor is connected to the output end of the secondary amplifier through the first voltage follower.

[0029] Furthermore, the amplifying circuit includes operational amplifiers U1 and U2, a first voltage follower U3, a first field effect transistor Q1, a second field effect transistor Q2, a NOT gate U4, a capacitor C1, and resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10;

[0030] The first-stage amplifier includes an operational amplifier U1, resistors R1, R2, R3, R4, and R5; the second-stage amplifier includes an operational amplifier U1, a capacitor C1, and resistors R6, R7, R8, R9, and R10; the switch component includes a first field-effect transistor Q1, a second field-effect transistor Q2, and a NOT gate U4;

[0031] Specifically, one end of the resistor R1 is set as the IN1 input terminal, the other end of the resistor R1, the positive input terminal of the operational amplifier U1, one end of the resistor R4, and one end of the resistor R5 are connected; the other end of the resistor R4 is connected to one end of the resistor R3, the other end of the resistor R3, one end of the resistor R2, and the negative input terminal of the operational amplifier U1 are connected, and the other end of the resistor R2 is grounded; pin 5 of the operational amplifier U1 is connected to the power supply and pin 2 is grounded; the other end of the resistor R5, one end of the resistor R7, and one end of the resistor R6 are connected; the output terminal of the operational amplifier U1 is connected to the drain of the first field effect transistor Q1, the gate of the first field effect transistor Q1 is connected to the output terminal of the NOT gate U4, the input terminal of the NOT gate U4 is connected to the gate of the second field effect transistor Q2, and the IN2 input terminal is set here; the drain of the second field effect transistor Q2, The source of the first field effect transistor Q1 is connected to one end of the resistor R9, the other end of the resistor R9, one end of the resistor R10, one end of the capacitor C1, and the positive input end of the operational amplifier U2 are connected, and the other end of the resistor R10 is connected to the other end of the capacitor C1 and is grounded; pin 5 of the operational amplifier U2 is connected to the power supply, and pin 2 is grounded, the negative input end of the operational amplifier U2, one end of the resistor R8, and the other end of the resistor R7 are connected, and the other end of the resistor R8 is grounded, the other end of the resistor R5, the output end of the operational amplifier U2, the output end of the first voltage follower U3, and the negative input end of the first voltage follower U3 are connected, and the OUT output end is set here; pin 2 of the first voltage follower U3 is connected to the power supply, and pin 5 is grounded; the positive input end of the first voltage follower U3 is connected to the source of the second field effect transistor Q2.

[0032] It should be explained that the IN1 input terminal is connected to the receiving module for receiving the electrical signal converted from the wireless signal; the IN2 input terminal is connected to the selection circuit; and the OUT output terminal is connected to the transmitting module.

[0033] It should be noted that in the amplifier circuit, the negative input terminal of the first-stage amplifier, the positive input terminal of the first-stage amplifier, the negative input terminal of the second-stage amplifier, and the output terminal of the second-stage amplifier are connected. This connection method effectively avoids phase advance, while enhancing the stability of the amplifier circuit, effectively preventing self-oscillation, and ensuring the accuracy and reliability of signal amplification processing.

[0034] The selection circuit includes a rectifier circuit, a voltage regulator circuit, and a comparison circuit. The input end of the rectifier circuit serves as the input end of the selection circuit, and the output end of the rectifier circuit is connected to the input end of the comparison circuit through the voltage regulator circuit; the output end of the comparison circuit is set as the output end of the selection circuit;

[0035] The voltage stabilizing circuit includes a first triode, a second triode, a third triode, a polarized capacitor, a diode, and multiple resistors. The base of the first triode, the positive electrode of the polarized capacitor, and the collector of the third triode are connected. The collector of the first triode is connected to the base of the first triode through a resistor, and an input terminal connected to the rectifier circuit is provided here. The collector of the second triode is connected to the collector of the first triode, the emitter of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the base of the third triode and the emitter of the third triode through different resistors, and the base of the third triode is connected to the emitter of the third triode through a diode.

[0036] The selection circuit further includes a second voltage follower, the output end of the second voltage follower is connected to the input end of the rectifier circuit, and the input end of the second voltage follower serves as the input end of the selection circuit.

[0037] It should be noted that the voltage stabilizing circuit further includes a filter capacitor, which is arranged at the input end of the voltage stabilizing circuit; this filter capacitor is a polarized capacitor.

[0038] It should be noted that the rectifier circuit is a diode rectifier bridge.

[0039] Furthermore, the selection circuit includes a second voltage follower U5, diodes D1, D2, D3, D4, D5, polarized capacitors C2, C3, a first transistor Q3, a second transistor Q4, a third transistor Q5, a comparator U6, a capacitor C4, and resistors R11, R12, R13, R14, R15, R16, and R17;

[0040] Among them, the diode rectifier bridge includes D1, D2, D3, and D4; the voltage stabilizing circuit includes polarized capacitors C2 and C3, a first transistor Q3, a second transistor Q4, a third transistor Q5, resistors R11, R12, R13, and R14, and a diode D5;

[0041] Specifically, the positive input terminal of the second voltage follower U5 is set to the SW_IN input terminal, pin 5 is connected to the power supply, and pin 2 is grounded. The negative input terminal of the second voltage follower U5, the output terminal of the second voltage follower U5, the cathode of the diode D1, and the anode of the diode D2 are connected. The cathode of the diode D2, the cathode of the diode D4, the positive electrode of the polar capacitor C2, one end of the resistor R11, the collector of the first transistor Q3, and the collector of the second transistor Q4 are connected. The other end of the resistor R11, the anode of the polar capacitor C3, the base of the first transistor Q3, and the collector of the third transistor Q5 are connected; the emitter of the first transistor Q3 is connected to the base of the second transistor Q4; the emitter of the second transistor Q4, one end of the resistor R12, one end of the resistor R13, and one end of the resistor R16 are connected. The other end of the resistor R12, the diode The cathode of the transistor D5 is connected to the emitter of the third transistor Q5, the other end of the resistor R13, one end of the resistor R14, and the base of the third transistor Q5 are connected, the other end of the resistor R14, the anode of the diode D5, the cathode of the polarized capacitor C3, the cathode of the polarized capacitor C3, the anode of the diode D1, and the anode of the diode D3 are connected, the cathode of the diode D3 and the anode of the diode D4 are connected and grounded; the other end of the resistor R16, one end of the capacitor C4, and the negative input terminal of the comparator U6 are connected; the positive input terminal of the comparator, one end of the resistor R15, and one end of the resistor R17 are connected, the other end of the resistor R15 is connected to pin 4 of the comparator U6 and grounded; the other end of the resistor R17, the other end of the capacitor C4, and pin 5 of the comparator U6 are connected and grounded; the output terminal of the comparator U6 is set to the SW_OUT output terminal.

[0042] It should be explained that the SW_IN input terminal is connected to the receiving module for receiving electrical signals; the SW_OUT output terminal is connected to IN2 of the amplifier circuit, and the selection circuit transmits the result signal to the switch component of the amplifier circuit, and the switch component switches channels according to the signal.

[0043] It should be noted that both the first follower and the second follower have an isolation function.

[0044] For ease of understanding, the workflow of the present invention is now described:

[0045] The amplifying circuit and the selecting circuit simultaneously receive the AC signal converted from the wireless signal transmitted by the receiving module;

[0046] The selection circuit sequentially passes the electrical signal through the second voltage follower, the rectifier circuit, and the voltage stabilizing circuit, converting the AC signal into a DC signal, which is then transmitted to the comparator. The comparator compares the DC signal. If the DC signal does not exceed the threshold, the comparator transmits a low level; if the DC signal exceeds the threshold, the comparator outputs a high level.

[0047] After receiving the signal transmitted by the comparator, the switch component in the amplifier circuit switches the channel according to this signal. If the IN2 input terminal of the amplifier circuit receives a low level, it means that the wireless signal is weak and needs to be amplified in the second stage. At this time, the first field-effect transistor is turned on and the second field-effect transistor is turned off.

[0048] If the IN2 input terminal of the amplifier circuit receives a high level, it means that the wireless signal is strong and only needs to be amplified by one stage. At this time, the first field effect transistor is turned off and the second field effect transistor is turned on;

[0049] The amplifier circuit outputs the amplified signal to the transmitter module, which converts it into a wireless signal and transmits it.

[0050] This utility model does not require human intervention. It can detect and automatically adjust the parameters of the amplification stage in real time to ensure that the system is always in the optimal operating state. It overcomes the limitations of traditional relay amplifiers that easily cause signal distortion in strong signal environments and unstable signal amplification in weak signal environments, and realizes comprehensive optimization of signal quality and stable transmission.

[0051] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details known in the art have been omitted. Based on the above description, those skilled in the art will fully understand how to implement the technical solutions of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A relay amplifier, comprising a receiving module, an amplifying module, and a transmitting module, wherein the amplifying module is connected to the receiving module and the transmitting module respectively, and characterized in that: The amplification module includes a selection circuit and an amplification circuit, the receiving module is connected to the input end of the selection circuit and an input end of the amplification circuit respectively, and the transmitting module is connected to the output end of the amplification circuit; the selection circuit is connected to the amplification circuit; The selection circuit includes a rectifier circuit, a voltage stabilizing circuit, and a comparison circuit. The input end of the rectifier circuit serves as the input end of the selection circuit, and the output end of the rectifier circuit is connected to the input end of the comparison circuit through the voltage stabilizing circuit; the output end of the comparison circuit is set as the output end of the selection circuit; The amplifier circuit includes a first-stage amplifier, a second-stage amplifier, and a switch component. The positive input terminal of the first-stage amplifier serves as an input terminal of the amplifier circuit, and the first-stage amplifier is connected to the positive input terminal of the second-stage amplifier through the switch component. The negative input terminal of the first-stage amplifier, the positive input terminal of the first-stage amplifier, the negative input terminal of the second-stage amplifier, and the output terminal of the second-stage amplifier are connected. The output terminal of the second-stage amplifier serves as the output terminal of the amplifier circuit. The switch component includes a first field effect transistor, a second field effect transistor, and a NOT gate. The drain of the first field effect transistor is connected to the output end of the first-stage amplifier, the source of the first field effect transistor, the drain of the second field effect transistor, and the positive input end of the second-stage amplifier are connected, the gate of the first field effect transistor is connected to the output end of the NOT gate, the input end of the NOT gate is connected to the gate of the second field effect transistor, and an input end connected to the selection circuit is set here; the source of the second field effect transistor is connected to the output end of the second-stage amplifier.

2. A relay amplifier according to claim 1, characterized in that: The voltage stabilizing circuit includes a first triode, a second triode, a third triode, a polarized capacitor, a diode, and multiple resistors. The base of the first triode, the positive electrode of the polarized capacitor, and the collector of the third triode are connected. The collector of the first triode is connected to the base of the first triode through a resistor, and an input end connected to the rectifier circuit is provided here; the collector of the second triode is connected to the collector of the first triode, the emitter of the first triode is connected to the base of the second triode, the emitter of the second triode is connected to the base of the third triode and the emitter of the third triode through different resistors, and the base of the third triode is connected to the emitter of the third triode through the diode.

3. The relay amplifier according to claim 2, characterized in that: The voltage stabilizing circuit further includes a filter capacitor, which is arranged at the input end of the voltage stabilizing circuit.

4. The relay amplifier according to claim 3, characterized in that: The filter capacitor is a polar capacitor.

5. The relay amplifier according to claim 1, wherein: The rectifier circuit is a diode rectifier bridge.

6. The relay amplifier according to claim 1, characterized in that: The switch component further includes a first voltage follower, and the source of the second field effect transistor is connected to the output end of the secondary amplifier through the first voltage follower.

7. The relay amplifier according to claim 1, characterized in that: The selection circuit further includes a second voltage follower, the output end of the second voltage follower is connected to the input end of the rectifier circuit, and the input end of the second voltage follower serves as the input end of the selection circuit.

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