CN106291183A - A kind of anti-interference multi-band signal harvester - Google Patents

Abstract

The invention relates to an anti-jamming multi-band signal collector, and its technical characteristics are: including a casing, an input end, an output end, a grounding end and an anti-jamming multi-band signal acquisition circuit inside the casing, an input end, an output end, a grounding The end is installed on the casing and connected with the anti-jamming multi-band signal acquisition circuit in the casing. The anti-jamming multi-band signal acquisition circuit is composed of multiple acquisition channels connected in parallel, and each acquisition channel includes The sampling capacitor, the sampling inductance and the transfer switch are connected in parallel with a branch circuit containing a piezoresistor in the sampling circuit. The present invention is provided with a plurality of acquisition channels, and selects the corresponding channel according to the central frequency range of the detection current signal, avoids the interference of other signals on the detection work, realizes the separate acquisition function of signals in different frequency bands, and improves the detection accuracy and detection efficiency, and at the same time, the varistor branch serves as a protection branch, which can prevent external overvoltage from causing damage to the equipment, and is safe to use.

Description

An anti-jamming multi-band signal collector

technical field

The invention belongs to the technical field of live detection, in particular to an anti-jamming multi-band signal collector.

Background technique

With the in-depth research of live detection technology, various detection equipment have been developed, and the detection principles are not the same. In the process of on-site inspection, it is often necessary to determine the inspection methods and instruments for the equipment and defect types. However, due to the complex on-site environment, interference signals often become a major problem for inspection personnel. As far as a substation is concerned, the equipment included may There are as many as dozens of types, and the signals generated are also very different. When carrying out live detection for a certain device, the signals generated by other devices will interfere with the detection, affecting the accuracy and efficiency of the test.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide an anti-interference multi-band signal collector with reasonable design, strong anti-interference ability and high efficiency.

The present invention solves its technical problem and realizes by taking the following technical solutions:

An anti-interference multi-band signal collector, comprising a casing, an input end, an output end, a grounding end, and an anti-interference multi-band signal acquisition circuit in the casing, the input end, the output end, and the grounding end are installed on the casing And be connected with the anti-interference multi-band signal acquisition circuit in the casing, the anti-interference multi-band signal acquisition circuit is formed by a plurality of acquisition channels connected in parallel, and each acquisition channel includes a sampling capacitor connected in series, a sampling inductors and transfer switches.

The multiple acquisition channels are also connected in parallel with a piezoresistor.

Advantage and positive effect of the present invention are:

1. The present invention is provided with a plurality of acquisition channels, and according to the center frequency range of the detection current signal, selects the corresponding channel, so that the signals of other frequencies are regarded as interference and grounded, and the output terminal only collects the signal of the required frequency, avoiding The interference of other signals to the detection work realizes the separate acquisition function of signals in different frequency bands, and improves the detection accuracy and detection efficiency.

2. The acquisition circuit of the present invention includes a piezoresistor parallel branch, which can prevent external overvoltage from causing damage to the equipment and is safe to use.

Description of drawings

Fig. 1 is a circuit connection diagram of the present invention;

Among them, 1-input terminal, 2-output terminal, 3-ground terminal, 4-sampling capacitor, 5-sampling inductance, 6-transfer switch, 7-varistor, 8-casing.

detailed description

Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

An anti-jamming multi-band signal collector, as shown in FIG. 1 , includes a housing 8, an input terminal 1, an output terminal 2, a grounding terminal 3 and an anti-jamming multi-band signal acquisition circuit inside the housing. The input terminal 1, the output terminal 2 and the ground terminal 3 are installed on the casing 8 and connected with the anti-interference multi-band signal acquisition circuit in the casing. The anti-interference multi-band signal acquisition circuit is composed of multiple Acquisition channels and piezoresistors 7 are formed, and each acquisition channel includes a sampling capacitor 4, a sampling inductance 5 and a switch 6 connected in series, and the piezoresistors 7 are connected in parallel with each acquisition channel, and the piezoresistors 7 It can prevent the electrical components of the acquisition circuit from being damaged when an external overvoltage occurs, thereby ensuring the safe use of the acquisition device.

When this signal collector is used on site, connect the front-end test sensor to input terminal 1, connect the back-end acquisition host to output terminal 2, and ground terminal 3 reliably. According to the center frequency range of the detection current signal, select the corresponding channel, turn the switch 6 of this channel to output, and turn the switch 6 of other channels to ground. According to the principle of circuit resonance, the sampling capacitor 4 and sampling inductance 5 of this channel have the lowest impedance to the collected frequency signal, which realizes the separation and extraction of the required signal. The signal collector can determine the number of channels and the collection frequency of each channel according to the needs. It is convenient and flexible to use on site. At the same time, because of the built-in varistor 7, it can prevent the electrical components of the collection circuit from being damaged when an external overvoltage occurs, ensuring the safe use of the collector. .

The signal collector has multiple acquisition channels, which can be adjusted according to the needs. Each channel is equipped with a transfer switch, which is used to control the connection with the output terminal or the ground terminal. Each channel is composed of sampling capacitor C _n and sampling inductance L _n . According to the principle of circuit resonance, when the current frequency is satisfied, the circuit impedance is the smallest, and the current conduction performance at this frequency is the best. According to this principle, the ω _n corresponding to each channel is determined by C _n and L _n . According to the center frequency range of the detected current signal, select the corresponding channel, turn the switch to output, and turn the switch of other channels to ground. Because the signals of other frequencies are regarded as interference and grounded, the output terminal only collects the signals of the required frequency, which avoids the interference of other signals on the detection work, and improves the detection accuracy and detection efficiency.

It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive, so the present invention includes but not limited to the embodiments described in the specific implementation manner, and those skilled in the art according to the technology of the present invention Other implementations derived from the scheme also belong to the protection scope of the present invention.

Claims (2)

1. an anti-interference multi-band signal harvester, it is characterised in that: include casing, input, outfan, earth terminal and Anti-interference multi-band signal Acquisition Circuit in casing, described input, outfan, earth terminal are arranged in casing and and casing In anti-interference multi-band signal Acquisition Circuit be connected, described anti-interference multi-band signal Acquisition Circuit is by being connected in parallel Multiple acquisition channels are constituted, and each acquisition channel all includes sampling capacitance, sampling inductance and the permutator being cascaded.

2. according to the anti-interference multi-band signal harvester of the one described in claim, it is characterised in that: the plurality of collection is led to Road is also connected in parallel with a varistor.