Signal receiving circuit and receiver applied to line finder, line finder

Abstract

The utility model relates to cable detection technical field discloses a signal receiving circuit and receiver, line finder for line finder, this signal receiving circuit can include probe interface, radio chip, clock supply circuit, for any cable of detection, the cable one end access line finder's transmitter's cable interface, when the receiver probe of probe interface access detects the other end of the cable, radio chip can receive the line signal of line finder's transmitter transmission and generate audio signal, the audio signal of generation is given receiver's main control chip, and main control chip controls audio output device to output sound after receiving audio signal, to prompt line search result. Visible, the utility model can apply radio chip to the receiver of line finder, can simplify circuit structure on the basis of realizing signal reception, and the integration level is high, reduces its to the occupation of circuit board volume.

Description

Technical Field

[0001] This utility model relates to the field of cable detection technology, and in particular to a signal receiving circuit and receiver for use in a cable finder, and a cable finder. Background Technology

[0002] In cable detection scenarios, cable locators are one of the more commonly used cable detection devices. They are mainly used to quickly locate target cables, and can also detect cable sequence and troubleshoot line faults.

[0003] A cable locator typically consists of a transmitter (also known as a signal source or transmitter) and a receiver (also known as a detector or receiver). The transmitter integrates a signal transmitting circuit, and the receiver integrates a signal receiving circuit. The cable locator works by transmitting a locating signal into the cable through the transmitter's signal transmitting circuit. The receiver then locates the other end of the cable. When the receiver approaches the other end, its signal receiving circuit receives the locating signal and sends a prompt signal to alert the relevant personnel to the correct cable.

[0004] However, in practice, it has been found that the existing signal receiving circuits used in line finders generally employ multiple discrete signal amplification circuits and signal processing circuits, resulting in complex circuits, discrete components, and a large footprint on the circuit board. Utility Model Content

[0005] This invention provides a signal receiving circuit and receiver for a cable finder, and the cable finder itself can simplify the circuit structure while achieving signal reception, and has a high degree of integration, reducing its footprint on the circuit board.

[0006] To solve the above-mentioned technical problems, the first aspect of this utility model discloses a signal receiving circuit applied to a line finder, the signal receiving circuit comprising: Probe interface, radio chip, and clock supply circuitry; The probe interface and the clock providing circuit are electrically connected to the radio chip, and the clock providing circuit is used to provide a clock signal to the radio chip; the control terminal and the output terminal of the radio chip are electrically connected to the main control chip of the receiver of the line finder; the probe interface is used to be electrically connected to the receiver probe; In this configuration, for any cable to be detected, one end of the cable is connected to the cable interface of the transmitter of the cable finder; the radio chip is used to receive the cable finding signal emitted by the transmitter and generate an audio signal when the receiver probe detects the other end of the cable, and to provide the audio signal to the main control chip of the receiver.

[0007] As an optional implementation, in the first aspect of this utility model, the signal receiving circuit further includes: a buffer circuit; The signal input terminal of the buffer circuit is electrically connected to the output terminal of the radio chip; the signal output terminal of the buffer circuit is used to electrically connect to the main control chip of the receiver. The audio signal generated by the radio chip is provided to the main control chip of the receiver via the buffer circuit.

[0008] As an optional implementation, in the first aspect of this invention, the buffer circuit includes an integrated operational amplifier circuit.

[0009] As an optional implementation, in the first aspect of this utility model, the signal receiving circuit further includes: a filtering circuit; The probe interface is electrically connected to the radio chip via the filter circuit.

[0010] As an optional implementation, in the first aspect of this utility model, the operating frequency of the radio chip is 520Hz~1710kHz.

[0011] As an optional implementation, in the first aspect of this utility model, the integrated operational amplifier circuit includes at least: a first channel integrated operational amplifier circuit and a second channel integrated operational amplifier circuit; The non-inverting input of the first channel integrated operational amplifier circuit is electrically connected to the first audio signal output of the radio chip; the inverting input of the first channel integrated operational amplifier circuit is electrically connected to the output of the first channel integrated operational amplifier circuit; the output of the first channel integrated operational amplifier circuit is used to electrically connect to the first audio signal receiving terminal of the receiver's main control chip. The non-inverting input of the second channel integrated operational amplifier circuit is electrically connected to the second audio signal output of the radio chip; the inverting input of the second channel integrated operational amplifier circuit is electrically connected to the output of the second channel integrated operational amplifier circuit; the output of the second channel integrated operational amplifier circuit is used to electrically connect to the second audio signal receiving terminal of the receiver's main control chip.

[0012] As an optional implementation, in the first aspect of this utility model, the clock providing circuit includes at least: a crystal oscillator Y2; One end of the crystal oscillator Y2 is electrically connected to the clock signal input terminal of the radio chip; the other end of the crystal oscillator Y2 is electrically connected to one of the general-purpose output terminals of the radio chip.

[0013] As an optional implementation, in the first aspect of this utility model, the clock providing circuit further includes: load capacitor C5 and load capacitor C6; Wherein, one end of the load capacitor C5 is electrically connected to one end of the crystal oscillator Y2 and the clock signal input terminal of the radio chip; one end of the load capacitor C6 is electrically connected to the other end of the crystal oscillator Y2 and one of the general-purpose output terminals of the radio chip; The other end of the load capacitor C5 and the other end of the load capacitor C6 are respectively used for grounding.

[0014] The second aspect of this utility model discloses a receiver for use in a line finder, the receiver comprising a receiver body and a signal receiving circuit as described in any one of the first aspects of this utility model.

[0015] The third aspect of this utility model discloses a cable finder, which includes a transmitter and a receiver; wherein the receiver includes a receiver body and a signal receiving circuit as described in any one of the first aspects of this utility model.

[0016] Implementing this utility model has the following beneficial effects: This utility model discloses a signal receiving circuit for a cable finder, comprising a probe interface, a radio chip, and a clock supply circuit. The probe interface and clock supply circuit are electrically connected to the radio chip, with the clock supply circuit providing a clock signal to the radio chip. The control terminal and output terminal of the radio chip are electrically connected to the main control chip of the cable finder's receiver. The probe interface is electrically connected to the receiver probe. For any cable to be detected, one end of the cable is connected to the cable interface of the cable finder's transmitter. When the receiver probe detects the other end of the cable, the radio chip receives the cable finding signal emitted by the transmitter and generates an audio signal, which is then provided to the receiver's main control chip. Upon receiving the audio signal, the main control chip controls the audio output device to output sound to indicate the cable finding result. Therefore, this utility model allows the application of a radio chip in the receiver of a cable finder, simplifying the circuit structure while achieving signal reception. It also achieves high integration, reducing the footprint on the circuit board. Furthermore, the radio chip enhances frequency selectivity and improves anti-interference capabilities, thereby improving the cable finding accuracy of the cable finder. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a signal receiving circuit for a line finder disclosed in an embodiment of this utility model; Figure 2 This is a schematic diagram of another signal receiving circuit for a line finder disclosed in this embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the main control chip in a receiver disclosed in an embodiment of this utility model. Detailed Implementation

[0019] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] It should be noted that, unless otherwise explicitly specified and limited, the term "electrical connection" in the specification, claims, and accompanying drawings of this utility model should be interpreted broadly. For example, it can refer to a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can refer to a mechanical electrical connection or a mutually communicating connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two components or the interaction between two components. Furthermore, the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] This utility model discloses a signal receiving circuit and receiver for a cable finder, and the cable finder itself. It allows the use of a radio chip in the receiver of the cable finder, simplifying the circuit structure while achieving signal reception, and achieving high integration, thus reducing its footprint on the circuit board. Furthermore, the radio chip enhances frequency selectivity and improves anti-interference capabilities, thereby improving the cable finding accuracy of the cable finder. Detailed descriptions follow.

[0022] Example 1 Please see Figure 1 , Figure 1 This is a schematic diagram of a signal receiving circuit used in a cable finder, as disclosed in an embodiment of this utility model. More specifically, this signal receiving circuit is used in the receiver of the cable finder. Figure 1 As shown, the signal receiving circuit 10 may include: The device includes a probe interface 101, a radio chip 102, and a clock supply circuit 103. The probe interface 101 and clock supply circuit 103 are electrically connected to the radio chip 102, and the clock supply circuit 103 provides a clock signal to the radio chip 102. The control terminal and output terminal of the radio chip 102 are electrically connected to the main control chip of the receiver of the line finder. The probe interface 101 is used for electrical connection with the receiver probe. Optionally, the receiver probe can be an antenna, such as a ferrite rod antenna.

[0023] In this process, for any cable to be detected, one end of the cable is connected to the cable interface of the transmitter of the cable finder; the radio chip 102 is used to receive the cable finding signal emitted by the transmitter and generate an audio signal when the receiver probe detects the other end of the cable, and the generated audio signal is provided to the main control chip of the receiver.

[0024] More specifically, when the receiver probe approaches the cable, the alternating electromagnetic field around the cable passes through the induction coil of the receiver probe, inducing an electromotive force (i.e., a weak high-frequency electrical signal) in the coil that matches the frequency of the electromagnetic field. The receiver probe transmits the induced high-frequency electrical signal to the radio chip 102 through the probe interface 101. The radio chip 102 integrates a frequency selection circuit, which can preset the "receiving frequency" through the clock supply circuit 103. This receiving frequency matches the frequency of the transmitter's line-finding signal. When mixed signals are received, the frequency selection circuit inside the radio chip 102 only responds to signals of the preset frequency (i.e., high-frequency line-finding signals). Signals of non-preset frequencies (which can also be understood as interference signals) are significantly attenuated or filtered out. For the high-frequency line-finding signal of the preset frequency, the radio chip 102 can demodulate the high-frequency line-finding signal into an audio signal and output the audio signal to the receiver's main control chip. The main control chip drives the audio output to realize the line-finding result indication.

[0025] Optionally, the radio chip 102 can be a Si4735, Si4703, or Si4705; and / or, the operating frequency range of the radio chip 102 can be AM 52Hz~1710 kHz, which is not limited in this embodiment of the present invention.

[0026] It should be noted that the structure of the main control chip of the receiver mentioned in the embodiments of this utility model can be found in [reference needed]. Figure 3 , Figure 3 This is a schematic diagram of the structure of a main control chip in a receiver disclosed in an embodiment of the present invention. In other optional embodiments, the signal receiving circuit 10 mentioned in this embodiment of the present invention may further include the main control chip of the receiver.

[0027] As can be seen, this utility model embodiment can apply the radio chip 102 to the receiver of the line finder, and use the "high frequency selection + audio conversion" capability of the radio chip 102 to replace the dedicated signal receiving and demodulation circuit. On the basis of achieving signal reception, the circuit structure is simplified, and the integration is high, reducing its footprint on the circuit board. In addition, the radio chip 102 can enhance frequency selectivity and improve anti-interference capability, which is conducive to improving line finding accuracy and line finding efficiency.

[0028] In an optional embodiment, such as Figure 2 As shown, the signal receiving circuit 10 may further include a buffer circuit 104. The signal input terminal of the buffer circuit 104 is electrically connected to the output terminal of the radio chip 102; the signal output terminal of the buffer circuit 104 is used to electrically connect to the main control chip of the receiver.

[0029] The audio signal generated by the radio chip 102 is provided to the receiver's main control chip via the buffer circuit 104.

[0030] Optionally, the buffer circuit 104 can be a circuit composed of an integrated operational amplifier (i.e., an integrated operational amplifier circuit) or a circuit composed of a MOSFET (metal-oxide-semiconductor field-effect transistor). This embodiment of the present invention does not limit the specific components.

[0031] As can be seen, this optional embodiment can also achieve isolation between the front and rear stage circuits through the buffer circuit 104, reducing or avoiding the influence of the rear stage circuit on the audio signal output by the radio chip 102.

[0032] In an optional embodiment, such as Figure 2 As shown, the signal receiving circuit 10 may further include a filter circuit 105; wherein the probe interface 101 is electrically connected to the radio chip 102 via the filter circuit 105.

[0033] In this optional embodiment, the filter circuit 105 may further include at least a filter capacitor C4. Even more optionally, the filter circuit 105 may also include a resistor R22, wherein the resistor R22 is connected in series with the filter capacitor C4.

[0034] Alternatively, the resistance of resistor R22 can be 0Ω, or it can be replaced with a resistor of other values ​​according to actual needs. During circuit debugging, the 0Ω resistor can serve as a placeholder, allowing operators to quickly disconnect or connect specific devices or components, such as inserting test equipment (e.g., oscilloscope probes, spectrum analyzers) or replacing other components (e.g., RC filters, ferrite beads). In practical applications, selecting a resistor R22 with an appropriate resistance value allows it to form an RC series circuit with the filter capacitor C4 to filter out noise signals and reduce interference.

[0035] As can be seen, this optional embodiment can also isolate DC signals and suppress low-frequency noise signals through the filter circuit 105 between the probe interface 101 and the radio chip 102. This reduces noise signals in the high-frequency signals transmitted to the radio chip 102, which is beneficial to improving the signal processing efficiency of the radio chip 102 and thus improving the line-finding efficiency. In addition, the filter circuit 105 has a simple structure and is easy to implement, which also helps to reduce the cost of the signal receiving circuit 10.

[0036] In another alternative embodiment, such as Figure 2 As shown, the aforementioned integrated operational amplifier circuit includes at least: a first-channel integrated operational amplifier circuit 1041 and a second-channel integrated operational amplifier circuit 1042. The non-inverting input of the first-channel integrated operational amplifier circuit 1041 is electrically connected to the first audio signal output of the radio chip 102; the inverting input of the first-channel integrated operational amplifier circuit 1041 is electrically connected to its output; and the output of the first-channel integrated operational amplifier circuit 1041 is electrically connected to the first audio signal receiving terminal of the receiver's main control chip. The non-inverting input of the second-channel integrated operational amplifier circuit 1042 is electrically connected to the second audio signal output of the radio chip 102; the inverting input of the second-channel integrated operational amplifier circuit 1042 is electrically connected to its output; the output of the second-channel integrated operational amplifier circuit 1042 is used to electrically connect to the second audio signal receiving terminal of the receiver's main control chip. Optionally, the first-channel integrated operational amplifier circuit 1041 and the second-channel integrated operational amplifier circuit 1042 can correspond to the left and right channels respectively, and can each include an integrated operational amplifier, such as an LMV358. The left and right channels are respectively connected to the non-inverting input of the integrated operational amplifier, and the output of the integrated operational amplifier is connected to the inverting input. This connection method is a voltage follower, and the output of the voltage follower is electrically connected to the receiver's main control chip. Among them, the voltage follower has an extremely high input impedance (approximately 1MΩ~10MΩ) and an extremely low output impedance (less than 100Ω), which can achieve impedance matching between the front and rear stages and reduce the impact of the rear stage circuit (such as ADC or load) on the front stage signal source (such as Si4730 audio output).

[0037] In this optional embodiment, the first audio signal output terminal of the radio chip 102 can be connected in series with a resistor R23, and / or the second audio signal output terminal of the radio chip 102 can be connected in series with a resistor R24. This not only matches the input range of the subsequent circuit (i.e., the integrated operational amplifier circuit), but also limits the current to protect the subsequent circuit and improve its safety.

[0038] In yet another alternative embodiment, such as Figure 2As shown, the clock providing circuit 103 described above includes at least: a crystal oscillator Y2; One end of crystal oscillator Y2 is electrically connected to the clock signal input terminal of radio chip 102; the other end of crystal oscillator Y2 is electrically connected to one of the general-purpose output terminals of radio chip 102, such as... Figure 2 GPIO3 in the middle.

[0039] As can be seen, this optional embodiment can provide a clock signal to the radio chip 102 via the crystal oscillator Y2, resulting in a simple structure and low cost. Furthermore, it can improve the accuracy of the radio chip 102 in locking onto high-frequency signals.

[0040] In this optional embodiment, the clock providing circuit 103 may further include: load capacitor C5 and load capacitor C6; One end of the load capacitor C5 is electrically connected to one end of the crystal oscillator Y2 and the clock signal input terminal of the radio chip 102; one end of the load capacitor C6 is electrically connected to the other end of the crystal oscillator Y2 and one of the general-purpose output terminals of the radio chip 102. The other end of load capacitor C5 and the other end of load capacitor C6 are respectively used for grounding.

[0041] For example, the capacitance values ​​of load capacitors C5 and C6 are typically 12~22pF, and the clock providing circuit 103 can provide a clock signal to the Si4730 at a typical frequency of 32.768kHz.

[0042] As can be seen, this optional embodiment can also reduce the cost of clock signal provided by clock providing circuit 103 to radio chip 102 through load capacitor C5 and load capacitor C6, and can also improve the stability of clock signal provided by clock providing circuit 103 to radio chip 102.

[0043] In this optional embodiment, the clock providing circuit 103 may further include a resistor R25, wherein the resistor R25 is connected in parallel with the crystal oscillator Y2.

[0044] As can be seen, this optional embodiment can connect resistor R25 in parallel to the clock signal supply path, forming an RC low-pass filter network with load capacitor C5 and load capacitor C6, which is beneficial for filtering out high-frequency noise.

[0045] Example 2 This utility model embodiment discloses a receiver for use in a line finder. The receiver may include a receiver body and any of the signal receiving circuits 10 described in Embodiment 1.

[0046] Example 3 This utility model discloses a cable finder, which may include a transmitter and a receiver. The receiver may include a receiver body and any of the signal receiving circuits 10 described in Embodiment 1.

[0047] The above provides a detailed description of a signal receiving circuit and receiver for a cable finder, as well as the cable finder itself, according to embodiments of the present invention. Specific embodiments have been used to illustrate the principles and implementation of the present invention. However, the above preferred embodiments are not intended to limit the present invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the structure and implementation principles of the present invention. Furthermore, those skilled in the art will recognize that, based on the concept of the present invention, changes may be made in the specific implementation methods and application scope without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the claims.

Claims

1. A signal receiving circuit applied to a line tracer, characterized by comprising: The signal receiving circuit (10) includes: The probe interface (101), the radio chip (102), and the clock supply circuit (103) are included. The probe interface (101) and the clock providing circuit (103) are electrically connected to the radio chip (102), respectively. The clock providing circuit (103) is used to provide a clock signal to the radio chip (102). The control terminal and the output terminal of the radio chip (102) are used to be electrically connected to the main control chip of the receiver of the line finder. The probe interface (101) is used to be electrically connected to the receiver probe. Wherein, for any cable to be detected, one end of the cable is connected to the cable interface of the transmitter of the cable finder; the radio chip (102) is used to receive the cable finding signal emitted by the transmitter and generate an audio signal when the receiver probe detects the other end of the cable, and to provide the audio signal to the main control chip of the receiver.

2. The signal receiving circuit applied to a line tracer according to claim 1, wherein The signal receiving circuit (10) further includes: a buffer circuit (104); The signal input terminal of the buffer circuit (104) is electrically connected to the output terminal of the radio chip (102); the signal output terminal of the buffer circuit (104) is used to electrically connect to the main control chip of the receiver. The audio signal generated by the radio chip (102) is provided to the main control chip of the receiver via the buffer circuit (104).

3. The signal receiving circuit applied to a line tracer according to claim 2, wherein The buffer circuit (104) includes an integrated operational amplifier circuit.

4. The signal receiving circuit applied to a line tracer according to claim 1, wherein The signal receiving circuit (10) further includes: a filter circuit (105); The probe interface (101) is electrically connected to the radio chip (102) via the filter circuit (105).

5. The signal receiving circuit applied to a line tracer according to any one of claims 1 to 4, characterized in that, The radio chip (102) operates at a frequency of 520Hz to 1710kHz.

6. The signal receiving circuit applied to a line tracer according to claim 3, wherein The integrated operational amplifier circuit includes at least: a first channel integrated operational amplifier circuit (1041) and a second channel integrated operational amplifier circuit (1042). The non-inverting input of the first channel integrated operational amplifier circuit (1041) is electrically connected to the first audio signal output of the radio chip (102); the inverting input of the first channel integrated operational amplifier circuit (1041) is electrically connected to the output of the first channel integrated operational amplifier circuit (1041); the output of the first channel integrated operational amplifier circuit (1041) is used to electrically connect to the first audio signal receiving terminal of the receiver's main control chip. The non-inverting input of the second channel integrated operational amplifier circuit (1042) is electrically connected to the second audio signal output of the radio chip (102); the inverting input of the second channel integrated operational amplifier circuit (1042) is electrically connected to the output of the second channel integrated operational amplifier circuit (1042); the output of the second channel integrated operational amplifier circuit (1042) is used to electrically connect to the second audio signal receiving end of the receiver's main control chip.

7. The signal receiving circuit applied to a line tracer according to any one of claims 1 to 4, characterized by, The clock providing circuit (103) includes at least: a crystal oscillator Y2; One end of the crystal oscillator Y2 is electrically connected to the clock signal input terminal of the radio chip (102); the other end of the crystal oscillator Y2 is electrically connected to one of the general-purpose output terminals of the radio chip (102).

8. The signal receiving circuit applied to a line tracer according to claim 7, wherein The clock providing circuit (103) also includes: load capacitor C5 and load capacitor C6; One end of the load capacitor C5 is electrically connected to one end of the crystal oscillator Y2 and the clock signal input terminal of the radio chip (102); one end of the load capacitor C6 is electrically connected to the other end of the crystal oscillator Y2 and one of the general-purpose output terminals of the radio chip (102). The other end of the load capacitor C5 and the other end of the load capacitor C6 are respectively used for grounding.

9. A receiver for use in a line tracer, the receiver comprising: The receiver includes a receiver body and a signal receiving circuit (10) as described in any one of claims 1-8.

10. A line tracer, characterized by The line finder includes a transmitter and a receiver; wherein the receiver includes a receiver body and a signal receiving circuit (10) as described in any one of claims 1-8.

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