Ad-hoc network power overload protection circuit

Abstract

The invention relates to the field of ad-hoc network communication, and particularly discloses an ad-hoc network power overload protection circuit, which comprises a first single-pole four-throw switch SW1, a second single-pole four-throw switch SW2, a power detector, a radio frequency signal transceiving unit T / R and a directional coupler of an external antenna, and is characterized in that an antenna end ANT of the second single-pole four-throw switch SW2 is connected with the directional coupler; the antenna end ANT of the first single-pole four-throw switch SW1 is connected with a radio frequency signal transceiving unit T / R; the directional coupler is connected with the input end of the power detector through the first adjustable attenuator ATT1. A large signal received by the second single-pole four-throw switch SW2 can be grounded through an external resistor, and the large signal cannot be transmitted and amplified any more, so that a radio frequency device of a receiving path cannot be damaged any more, and the circuit is protected quickly and effectively.

Description

Technical Field

[0001] The present invention relates to the field of ad hoc network communications, in particular to a power overload protection circuit for an ad hoc network. Background Art

[0002] An ad hoc network (AMN) is a network that combines mobile communications and computer networks. Information exchange on the network utilizes the packet switching mechanism found in computer networks. User terminals are portable and mobile. Each user terminal in an AMN serves as both a router and a host. As a host, the terminal needs to run various user-oriented applications, such as editors and browsers. As a router, the AMN routing protocol aims to be fast, accurate, and efficient. It requires finding accurate and available routing information in the shortest possible time and adapting to rapid changes in network topology while minimizing the additional latency and control information required to maintain routing. This reduces routing protocol overhead to meet the limitations of mobile terminals in terms of computing power, storage space, and power. When AMN communication equipment is actually used, the complete signal transmission process includes both signal transmission and reception. Traditional schemes often employ a single-link reception for the signal reception link.

[0003] However, when the current self-sufficient network detection circuit encounters forced backflow of large signals at the same frequency point, the components on the receiving link are extremely susceptible to damage, causing abnormal operation of the entire machine and directly damaging the PA. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a power overload protection circuit for an ad hoc network, which solves the problems mentioned in the above background.

[0005] The present invention provides the following technical solution: a self-organizing network power overload protection circuit, comprising: a first single-pole four-throw switch SW1, a second single-pole four-throw switch SW2, a power detector, a radio frequency signal transceiver unit T / R, and a directional coupler for an external antenna, wherein the antenna end ANT of the second single-pole four-throw switch SW2 is connected to the directional coupler; the antenna end ANT of the first single-pole four-throw switch SW1 is connected to the radio frequency signal transceiver unit T / R; the directional coupler is connected to the input end of the power detector via a first adjustable attenuator ATT1; the output end of the power detector is respectively connected to the logic pin LS of each of the first single-pole four-throw switch SW1 and the second single-pole four-throw switch SW2; the first single-pole four-throw switch SW1 and the second single-pole four-throw switch SW2 are respectively connected via a first path and a second path.

[0006] As a further solution of the present invention: the first path includes: a second adjustable attenuator ATT2, a first filter LPF1 and a transmitting signal amplifier PA connected in series in sequence, the input end of the second adjustable attenuator ATT2 is connected to the first switch end RF1 of the first single-pole four-throw switch SW1, and the output end of the transmitting signal amplifier PA is connected to the first switch end RF1 of the second single-pole four-throw switch SW2.

[0007] As a further solution of the present invention: the second path includes: a second filter LPF2, a signal low noise amplifier LNA and a third filter LPF3 connected in series in sequence, the input end of the second filter LPF2 is connected to the second switch end RF2 of the second single-pole four-throw switch SW2; the output end of the third filter LPF3 is connected to the second switch end RF2 of the first single-pole four-throw switch SW1.

[0008] As a further solution of the present invention: the fourth switch end RF4 of the first single-pole four-throw switch SW1 and the third switch end RF3 of the second single-pole four-throw switch SW2 are each connected to a resistor.

[0009] As a further solution of the present invention: the radio frequency signal transceiver unit T / R is connected to two voltage terminals of the first single-pole four-throw switch SW1 and the second single-pole four-throw switch SW2 respectively.

[0010] As a further solution of the present invention: the power detector is a detection Schottky transistor.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The large signal received by the antenna end SW2 can be grounded with an external resistor. The large signal can no longer be transmitted to the subsequent signal low-noise amplifier LNA for amplification, and thus can no longer damage the RF devices in the receiving path, ensuring a fast and effective protection circuit.

[0013] When receiving signals, large signals are consumed by the ground introduced by antenna SW2 before entering the RF receiving link. When transmitting signals, when the fully reflected signal is detected, the switch on antenna SW2 can introduce the input source of the transmitting signal into the ground, cutting off the transmitting source. The detection speed is fast, which can ensure the protection of the path. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a power overload protection circuit for an ad hoc network;

[0015] Figure 2 The present invention is a circuit diagram of a detector in a power overload protection circuit of an ad hoc network;

[0016] Figure 3The invention relates to an operating logic table in a power overload protection circuit of an ad hoc network. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0018] like Figure 1-3 As shown, this embodiment provides a self-organizing network power overload protection circuit, including: a first single-pole 4-throw switch SW1, a second single-pole 4-throw switch SW2, a power detector, a radio frequency signal transceiver unit T / R and a directional coupler for an external antenna, the power detector is a detection Schottky tube, and the antenna end ANT of the second single-pole 4-throw switch SW2 is connected to the directional coupler; the antenna end ANT of the first single-pole 4-throw switch SW1 is connected to the radio frequency signal transceiver unit T / R, and the radio frequency signal transceiver unit T / R is respectively connected to the two voltage ends of the first single-pole 4-throw switch SW1 and the second single-pole 4-throw switch SW2; the directional coupler is connected to the input end of the power detector through a first adjustable attenuator ATT1; the output end of the power detector is respectively connected to the logic pins LS of the first single-pole 4-throw switch SW1 and the second single-pole 4-throw switch SW2, the fourth switch end RF4 of the first single-pole 4-throw switch SW1 and the fourth switch end RF5 of the second single-pole 4-throw switch SW2. The third switch terminal RF3 of each single-pole, four-throw switch SW2 is connected to a resistor; the first single-pole, four-throw switch SW1 and the second single-pole, four-throw switch SW2 are connected via a first path and a second path, respectively. The first path includes: a second adjustable attenuator ATT2, a first filter LPF1, and a transmit signal amplifier PA connected in series in sequence. The input end of the second adjustable attenuator ATT2 is connected to the first switch terminal RF1 of the first single-pole, four-throw switch SW1, and the output end of the transmit signal amplifier PA is connected to the first switch terminal RF1 of the second single-pole, four-throw switch SW2. The second path includes: a second filter LPF2, a signal low-noise amplifier LNA, and a third filter LPF3 connected in series in sequence. The input end of the second filter LPF2 is connected to the second switch terminal RF2 of the second single-pole, four-throw switch SW2; and the output end of the third filter LPF3 is connected to the second switch terminal RF2 of the first single-pole, four-throw switch SW1.

[0019] The working principle of the present invention is as follows: the directional coupler obtains the large signal from the second single-pole 4-throw switch SW2, and transmits this large signal to the power detector through the first adjustable attenuator ATT1. When the input power is detected to be 8dBm, it outputs a 2V voltage, and connects this voltage signal VCC to the logic pin LS of the second single-pole 4-throw switch SW2 and the first single-pole 4-throw switch SW1. In actual operation, under normal circumstances, when there is no large signal input, or the antenna end is well adapted and the antenna is not disconnected; VCC is a value close to 0V VC C=LS,VCC≤0.8V,LS is logic low, antenna terminal SW1 and antenna terminal SW2 will operate according to the preset logic; that is, when the signal is transmitted TX, the second single-pole 4-throw switch SW2 and the first single-pole 4-throw switch SW1 are both switched to the channel transmission signal of the first switch terminal RF1 (LS:V1:V2=0:0:0); when the signal is received RX, the second single-pole 4-throw switch SW2 and the first single-pole 4-throw switch SW1 are both switched to the channel transmission signal of the second switch terminal RF2 (LS:V1:V2=0:1:0). When a large signal is input , or when the antenna end is mismatched or the antenna is disconnected, the Schottky diode will output a voltage higher than about 1.5V. The voltage can be debugged by adjusting the attenuation value of the first attenuator ATT1, that is, VCC = LS = 1.5V. When LS> 1.2V, it is judged to be logic high; when transmitting, the path logic at this time is the first single-pole 4-throw switch SW1 cut to the fourth switch terminal RF4 (LS: V1: V2 = 1: 0: 0), and the transmission signal is directly connected to the resistor at the fourth switch terminal RF4 (resistance: 50Ω) and grounded. The signal can no longer be transmitted, which protects the transmitting signal amplifier PA from being damaged by the high power reflected back; when receiving, the backflow of this large signal is detected, and the second single-pole 4-throw switch SW2 is switched to the third switch terminal RF3 (LS: V1: V2 = 1: 1: 0). The received large signal is directly grounded from the resistor connected to the third switch terminal RF3. The large signal can no longer be transmitted to the subsequent signal low-noise amplifier LNA for amplification, and thus can no longer damage the RF components in the receiving path, so that the damage to the RF components caused by the backflow of large signals or total reflection can be effectively and timely intercepted.

[0020] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0021] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A self-organizing network power overload protection circuit, characterized in that: include: A first single-pole 4-throw switch (SW1), a second single-pole 4-throw switch (SW2), a power detector, a radio frequency signal transceiver unit (T / R), and a directional coupler for an external antenna, The antenna terminal (ANT) of the second single-pole 4-throw switch (SW2) is connected to the directional coupler; the antenna terminal (ANT) of the first single-pole 4-throw switch (SW1) is connected to the radio frequency signal transceiver unit (T / R); The directional coupler is connected to the input end of the power detector through a first adjustable attenuator (ATT1); the output end of the power detector is connected to the logic pins (LS) of the first single-pole four-throw switch (SW1) and the second single-pole four-throw switch (SW2); The first single-pole four-throw switch (SW1) and the second single-pole four-throw switch (SW2) are connected via a first path and a second path respectively.

2. The power overload protection circuit of an ad hoc network according to claim 1, characterized in that: The first path comprises: a second adjustable attenuator (ATT2), a first filter (LPF1) and a transmission signal amplifier (PA) connected in series in sequence, the input end of the second adjustable attenuator (ATT2) being connected to the first switch end (RF1) of the first single-pole four-throw switch (SW1), and the output end of the transmission signal amplifier (PA) being connected to the first switch end (RF1) of the second single-pole four-throw switch (SW2).

3. The power overload protection circuit of an ad hoc network according to claim 1, characterized in that: The second path includes: a second filter (LPF2), a signal low noise amplifier (LNA), and a third filter (LPF3) connected in series in sequence, the input end of the second filter (LPF2) being connected to the second switch end (RF2) of the second single-pole four-throw switch (SW2); and the output end of the third filter (LPF3) being connected to the second switch end (RF2) of the first single-pole four-throw switch (SW1).

4. The power overload protection circuit of an ad hoc network according to claim 1, characterized in that: The fourth switch terminal (RF4) of the first single-pole four-throw switch (SW1) and the third switch terminal (RF3) of the second single-pole four-throw switch (SW2) are each connected to a resistor.

5. The self-organizing network power overload protection circuit according to claim 1, characterized in that: The radio frequency signal transceiver unit (T / R) is respectively connected to two voltage terminals of the first single-pole four-throw switch (SW1) and the second single-pole four-throw switch (SW2).

6. The self-organizing network power overload protection circuit according to claim 1, characterized in that: The power detector is a Schottky detection tube.

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