CN204086396U

CN204086396U - Power phase acquisition and storage device in a kind of fixed telephone network

Info

Publication number: CN204086396U
Application number: CN201420469358.4U
Authority: CN
Inventors: 王学强; 吉建梅
Original assignee: Nanjing Institute of Technology
Current assignee: Nanjing Institute of Technology
Priority date: 2014-08-20
Filing date: 2014-08-20
Publication date: 2015-01-07
Anticipated expiration: 2024-08-20

Abstract

The utility model discloses power phase acquisition and storage device in a kind of fixed telephone network, it is characterized in that: comprise phase acquisition system, single chip control module and phase place storage system, described phase acquisition system comprises the voltage reduction module, voltage bias module, the DSP processing module that connect successively; Described single chip control module connects DSP processing module, external memory interface, LCD MODULE and key control module respectively; The input end of described voltage reduction module is electrically connected with fixed telephone network, and the output terminal of described DSP processing module is connected with phase place storage system by external memory interface.The utility model selection gathers store power phase place in the fixed telephone network of 50V, and step-down difficulty reduces, and equipment making cost reduces, and security improves greatly, and energy complete independently phase acquisition and preservation data manipulation, memory data output is large, convenient storage.

Description

Power phase acquisition and storage device in a kind of fixed telephone network

Technical field

The utility model relates to power phase in a kind of fixed line and measures memory storage.

Background technology

At present, crime rate based on DAB is more and more higher, this just require adopt these DABs as evidence before first to judge that whether they be original and complete, if the when and where of audio frequency evidence can be identified, more convictive reference frame will be provided for whether juridical authorities adopts this evidence.A lot of voice forensic technologies occurs thereupon at present.In some voice forensic technologies by the frequecy characteristic in sound signal and the signal frequency Characteristic Contrast in electrical network to determine the place of time and the recording of recording.Up-to-date audio forensics technology shows: in the space of distribution power lines everywhere, include power phase feature in the audio frequency recorded, on electrical network, the transient change of load makes phase fluctuation and time have obvious corresponding relation.Therefore, if identify from the features relevant parameter such as record length, place grid power phase characteristic angle extraction sound signal recording, can as strong evidence.

Existing power phase harvester, comprise PC and the phase acquisition point for gathering power phase from 220V utility grid, this device can not carry out independence survey and operate mutually, need by host computer, and locally cannot preserve data, data store inconvenient, and carry out phase acquisition to the civil power of 220V, voltage is higher, there is potential safety hazard.

What adopt due to fixed telephone network is mains-supplied, same containing power phase feature in fixed telephone network, and fixed telephone network covers wide, fixed telephone network voltage be only 50V, far below line voltage 220V.

Document (" Audio Authenticity:Detecting ENF Discontinuity With High Precision Phase Analysis ", Rodri guez, D.P.N., etc., IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY, VOL. 5, NO. 3, SEPTEMBER 2010) (" audio frequency authenticity: the high-precision phase position of detection of grid frequency discontinuity ", Rodri guez, D.P.N. people .W.P.B is waited, the evidence obtaining of IEEE proceedings information and safety, 5th volume the 3rd phase, in September, 2010) disclose (see 535-536 page) a kind of high-precision method for detecting phases, the method is by a series of conversion relevant with trigonometric function, calculate phase data dexterously.The method has that precision is high, efficiency high, and is easier to realize.

Utility model content

For solving deficiency of the prior art, the utility model to provide in a kind of fixed telephone network power phase to measure memory storage, solve the security of existing power phase harvester low, independent acquisition phase place, data can not store inconvenient technical matters.

In order to realize above-mentioned target, the utility model adopts following technical scheme: power phase acquisition and storage device in a kind of fixed telephone network, it is characterized in that: comprise phase acquisition system, single chip control module and phase place storage system, described phase acquisition system comprises the voltage reduction module, voltage bias module, the DSP processing module that connect successively; Described single chip control module connects DSP processing module, external memory interface, LCD MODULE and key control module respectively; The input end of described voltage reduction module is electrically connected with fixed telephone network, and the output terminal of described DSP processing module is connected with phase place storage system by external memory interface.

Power phase acquisition and storage device in aforesaid a kind of fixed telephone network, is characterized in that: described voltage reduction module adopts 50V to turn the step-down chip of 5V TO263-5.

Power phase acquisition and storage device in aforesaid a kind of fixed telephone network, is characterized in that: described voltage bias module adopts two-way low noise rail-to-rail operation amplifier TLC2274.

Power phase acquisition and storage device in aforesaid a kind of fixed telephone network, is characterized in that: described DSP processing module adopts TMS320F28335 type digital signal processor.

Power phase acquisition and storage device in aforesaid a kind of fixed telephone network, is characterized in that: described single chip control module adopts STC89C52 microcontroller.

Power phase acquisition and storage device in aforesaid a kind of fixed telephone network, is characterized in that: shown LCD MODULE adopts 1602 liquid crystal display.

Power phase acquisition and storage device in aforesaid a kind of fixed telephone network, is characterized in that: described external memory interface adopts CH375 usb bus common interface chip.

Power phase acquisition and storage device in aforesaid a kind of fixed telephone network, is characterized in that: described phase place storage system is support the storage medium of usb protocol.

The beneficial effect that the utility model reaches: key control module sends order to single chip control module, the order received is sent to DSP processing module and controls its running to start or stop data acquisition operations by single chip control module, phase acquisition system by carrying out step-down successively to 50V fixed telephone network, voltage bias, the computing of existing survey phase algorithm obtain phase data, then be sent in phase place storage system by external memory interface; Send instruction by single chip control module and complete data deletion action to the chip of external memory interface.The utility model is selected to gather store power phase place in the fixed telephone network of 50V, and step-down difficulty reduces, and equipment making cost reduces, and security improves greatly, and can survey mutually and preserve data manipulation by complete independently, and memory data output is large, convenient storage.

Accompanying drawing explanation

Fig. 1 is schematic block circuit diagram of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.

As shown in Figure 1, power phase acquisition and storage device in a kind of fixed telephone network, comprises phase acquisition system, single chip control module and phase place storage system.

Phase acquisition system comprises the voltage reduction module, voltage bias module, the DSP processing module that connect successively.The input end of voltage reduction module is electrically connected with fixed telephone network.Voltage reduction module adopts 50V to turn the step-down chip of 5V TO263-5, fixed line voltage is dropped to-5V ~+5V, then by electric resistance partial pressure to-3.3V ~+3.3V, voltage bias module adopts two-way low noise rail-to-rail operation amplifier TLC2274, signal after step-down is biased between 0 ~+3.3V, to meet the analog-to-digital conversion device input requirements of dsp chip.DSP processing module adopts TMS320F28335 type digital signal processor, and the precision of this chip is high, cost is low, power consumption is little, performance is high, and peripheral hardware integrated level is high, and greatly, analog to digital conversion more accurately fast for data and program memory space; The fixed line voltage signal handled well is converted to digital signal by DSP processing module, and this signal is again through the narrow-band filtering of 49Hz ~ 51Hz, and the survey phase algorithm computing in the document that filtered signal is introduced in background technology obtains phase information.

Single chip control module connects DSP processing module, external memory interface, LCD MODULE, key control module.The output terminal of DSP processing module is connected with external memory interface; The output terminal of external memory interface is connected with phase place storage system.Phase place storage system is support the storage medium of usb protocol, such as USB flash disk, card reader etc.

Single chip control module adopts STC89C52 microcontroller, is simple and easy to use, efficient stable.LCD MODULE adopts 1602 liquid crystal display.External memory interface adopts CH375 usb bus common interface chip, provides general passive parallel interface and point-to-point serial line interface in this locality.Single chip control module receives the order that key control module sends, and this device starts, stop data collection operation order to be sent to DSP processing module to complete control, maybe exterior storage interface chip is sent to complete the data manipulation of removing in phase place storage system order.

A toggle switch " A " and three buttons " B ", " C ", " D " (A-" start " is comprised by key control system; B-" reset ", " C "-" start/stop ", " D "-clear data), the present embodiment device concrete operation step is as follows:

1) ensure that all equipment that need power all accesses power supply and device connects intact, by fixed-line phone network winding thread access device;

2) toggle switch A, starting outfit enters open state;

3) push button C, starts to gather and store data, if equipment quits work, the B that can push button carries out reset operation, again can stir A carry out power-off operation as needed closing device;

4) as stopped data collection, shut-down operation can be carried out by C; Can carry out by D the operation that clears data as cleared data;

5) as by statistical conversion in database, USB flash disk or card reader need extracted to insert and derive on computers.

The utility model is selected to gather store power phase place in the fixed telephone network of 50V, and step-down difficulty reduces, and equipment making cost reduces, and security improves greatly, and can survey mutually and preserve data manipulation by complete independently, and memory data output is large, convenient storage.

The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and distortion, these improve and distortion also should be considered as protection domain of the present utility model.

Claims

1. power phase acquisition and storage device in a fixed telephone network, it is characterized in that: comprise phase acquisition system, single chip control module and phase place storage system, described phase acquisition system comprises the voltage reduction module, voltage bias module, the DSP processing module that connect successively; Described single chip control module connects DSP processing module, external memory interface, LCD MODULE and key control module respectively; The input end of described voltage reduction module is electrically connected with fixed telephone network, and the output terminal of described DSP processing module is connected with phase place storage system by external memory interface.

2. power phase acquisition and storage device in a kind of fixed telephone network according to claim 1, is characterized in that: described voltage reduction module adopts 50V to turn the step-down chip of 5V TO263-5.

3. power phase acquisition and storage device in a kind of fixed telephone network according to claim 1, is characterized in that: described voltage bias module adopts two-way low noise rail-to-rail operation amplifier TLC2274.

4. power phase acquisition and storage device in a kind of fixed telephone network according to claim 1, is characterized in that: described DSP processing module adopts TMS320F28335 type digital signal processor.

5. power phase acquisition and storage device in a kind of fixed telephone network according to claim 1, is characterized in that: described single chip control module adopts STC89C52 microcontroller.

6. power phase acquisition and storage device in a kind of fixed telephone network according to claim 1, is characterized in that: shown LCD MODULE adopts 1602 liquid crystal display.

7. power phase acquisition and storage device in a kind of fixed telephone network according to claim 1, is characterized in that: described external memory interface adopts CH375 usb bus common interface chip.

8. power phase acquisition and storage device in a kind of fixed telephone network according to claim 1, is characterized in that: described phase place storage system is support the storage medium of usb protocol.