Down-conversion and signal-conversion integrated system
An integrated system and signal conversion technology, applied in the direction of multi-frequency modulation conversion, testing dielectric strength, etc., can solve the problems of reducing the reliability of test results, easy to introduce interference, and inconvenient installation, etc., to achieve the reduction of internal coaxial cables, The effect of eliminating spectrum aliasing and reducing interference
Active Publication Date: 2012-11-14
HANGZHOU KELIN ELECTRIC POWER EQUIP
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Problems solved by technology
The signal passes through the connector->coaxial cable->connector, which is inconvenient to install, and has a large insertion loss and is easy to introduce interference
The most serious problem is that the analog down-conversion will cause spectrum aliasing when mixing. For example, we want to sample an 800M signal, and then we set the local oscillator signal to 790M, so that the frequency of the 800M signal becomes 10M after mixing, but The signal frequency of 780M will also change to 10M. The 10M signal sampled by the AD sampling card is actually the superposition of the two frequency band signals before mixing, which reduces the reliability of the detection results.
Method used
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[0012] Hereinafter, the present invention will be further described through embodiments in combination with the drawings.
[0013] Such as figure 1 , figure 2 As shown, the down-conversion and signal conversion integrated system described in this embodiment includes a PCB board, FPGA chip and AD sampling card. The PCB board is a multilayer layout and integrates a down-conversion module. The module includes a filter amplifier circuit, two mixing branches connected to the filter amplifier circuit and an oscillator, the two mixing branches are connected to the filter amplifier circuit, and the filter amplifier circuit is connected by an amplifier and one end. The filter composition of the signal interface to access the signal. Each mixing branch includes a multiplier with an oscillator signal input port and a low-pass filter. The oscillator is provided with two A signal output port that outputs two local oscillator signals with a phase difference of 90 degrees. The two signal outp...
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The invention relates to a transformer partial discharging signal acquisition device, in particular to a down-conversion and signal-conversion integrated system, which solves the technical problems of large interference and poor reliability of a detected result because the existing partial discharging signal processed by the analogue down-conversion is required to be transmitted to an analogue-digital (AD) sampling card through a coaxial cable. The down-conversion and signal-conversion integrated system comprises a printed circuit board (PCB) and a field programmable gate array (FPGA) chip, and is characterized in that: the PCB consists of a plurality of cloth boards and is integrated with a down-conversion module; the down-conversion module comprises a filter amplifying circuit and two frequency mixing branches connected with the filter amplifying circuit; the filter amplifying circuit is composed of an amplifier and a filter, one end of which is connected with a signal interface foraccessing a signal; and each of the frequency mixing branches comprises a multiplier and a low-pass filter. The down-conversion and signal-conversion integrated system realizes integration of the down-conversion and the AD sampling card on one PCB card, so the transmission by the coaxial cable is eliminated, the signal loss is low, the interference is reduced, and the frequency and spectrum mixing caused by frequency mixing by one branch is eliminated.
Description
Technical field [0001] The invention relates to a device for collecting partial discharge signals of a transformer, in particular to an integrated system of down-conversion and signal conversion. Background technique [0002] At present, the known partial discharge signal acquisition system for transformers is composed of discrete analog down-conversion and AD sampling cards. The analog down conversion is responsible for moving the partial discharge signal from the high frequency band to the low frequency band, and the AD sampling card is responsible for the digitization of the signal after the frequency spectrum is moved. The analog down conversion is composed of a local oscillator and a multiplier. The local oscillator is responsible for generating local oscillator signals of different frequencies. The multiplier completes the multiplication of the partial discharge signal and the local oscillator signal. After the partial discharge signal enters the analog down-conversion, th...
Claims
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IPC IPC(8): H03D7/16G01R31/12
Inventor 谢炜谢东汪业
Owner HANGZHOU KELIN ELECTRIC POWER EQUIP