CN203761387U

CN203761387U - Low-voltage power line carrier communication circuit based on OFDM mode modulation

Info

Publication number: CN203761387U
Application number: CN201320813129.5U
Authority: CN
Inventors: 崔健; 胡亚军; 董海涛; 傅涛; 聂廷卫; 胡小晔
Original assignee: Qingdao Eastsoft Communication Technology Co Ltd
Current assignee: Qingdao Eastsoft Communication Technology Co Ltd
Priority date: 2013-12-12
Filing date: 2013-12-12
Publication date: 2014-08-06
Anticipated expiration: 2023-12-12

Abstract

The utility model discloses a low-voltage power line carrier communication circuit based on OFDM mode modulation. The circuit includes a carrier control circuit, a zero crossing detection circuit and a signal coupling circuit; the carrier control circuit comprises an SSC1650 chip and a peripheral circuit; the SSC1650 chip includes an ARM kernel chip, a PLL, an OFDM baseband, an AFE, and an SPI; the ARM kernel chip is connected through a bus with the OFDM baseband and the SPI; the chip also includes an SWD ICE, a PMU Control, a UART, a WDT, a GPIO, and an ADC module; and the SWD ICE, the PMU Control, the UART, the WDT, the GPIO, and the ADC module are connected through the bus with the ARM kernel chip. Compared with the prior art, according to the low-voltage power line carrier communication circuit based on the OFDM mode modulation of the utility model, the highest rate can reach 150kbps; and the 128bits AES encryption mechanism is used to guarantee the communication security.

Description

A kind of low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern

Technical field

The utility model relates to a kind of power carrier communication circuit, is specifically related to a kind of low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern.

Background technology

Along with the progressively foundation of national intelligent grid, voltage power-line carrier communication technology has obtained in depth application at electric energy and various energy measurements field, following electrical network must be electricity consumption, charging, be in communication in integrated automated system, because carrier communication utilizes power line itself as transmission channel, make it there is unrivaled advantage as means of communication, and power line carrier communication will be very extensive in range of application and the prospect in the fields such as electric appliance automatic control, therefore, power line carrier communication has huge economic benefit and significant social benefit.But there is many factors that is unfavorable for voltage power-line carrier communication technology development in China Power Grids, for example: branch's topological structures many, that it is complicated of mains by harmonics serious interference, the pressure standard limiting without electro instrument noise, low-voltage network become while having caused network impedance and be non-linear, under so severe power grid environment, the key that realizes low-voltage power carrier mechanics of communication is to solve the problems such as impedance matching, power line signal decay, noise and the interference of power line network., mostly there is the problems such as circuit structure complexity, cost is high, operating voltage range is narrow, fidelity is poor, current drain is excessive in existing low-voltage powerline carrier communication circuit.

Chinese Patent Application No. 201220740043.X, a kind of low-voltage powerline carrier communication circuit is disclosed, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit, between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, wherein, signal filtering amplifying circuit amplifies the analog signal of carrier Control circuit output, after filtering, enter in power line channel and transmit through signal coupling circuit, the signal transmitting in power line channel is after signal coupling circuit conversion, after eliminating High-frequency Interference, wave reception filtering circuit is delivered to carrier Control circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, for controlling the output current of carrier Control circuit, zero cross detection circuit is connected between carrier Control circuit and power line, for power network power frequency component zero passage is detected.The utility model circuit is simple, has increased signal amplification circuit filter and current-limiting circuit, low in energy consumption, fidelity is high, and carrier communication performance is high; But what the carrier Control circuit described in it adopted is SSC1641 control chip, only support BFSK communication mode, and can only realize the carrier communication of 270kHz, for there being other frequency range requirements, and the place that other modulation systems require can not meet and the additional EEPROM of needs, wave reception filtering circuit protection diode of the present utility model is arranged on the 2nd grade, and protection effect is good not; And power circuit current drain is 3mA, and loss ratio is higher.

Utility model content

For addressing the above problem, the utility model object, in a kind of low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern is provided, adopts OFDM modulating mode, and band efficiency is high; The intersymbol interference that multipath transmisstion causes (ISI) and fading problem are solved.

For achieving the above object, the technical scheme that the utility model adopts is: a kind of low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern, and this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit; Stating carrier Control circuit is made up of SSC1650 chip and peripheral circuit; Described SSC1650 chip, this chip comprises ARM core chip, PLL, OFDM base band, AFE, SPI; Described ARM core chip is connected with OFDM base band, SPI by bus; Described chip also comprises SWD ICE, PMU Control, UART, WDT, GPIO, ADC module; Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC module are all connected with ARM core chip by bus; Between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, zero cross detection circuit is connected between carrier Control circuit and power line, and described telecommunication circuit also comprises the power unit to telecommunication circuit power supply.

Further, the resolution of described ADC module is 10.

Further, described OFDM base band is connected with AFE.

Further, described carrier Control circuit is connected with interface circuit and indicator light.

Further, described wave reception filtering circuit comprises two stage filter circuit, and wherein, first order filter circuit connects signal coupling circuit, and second level filter circuit connects carrier Control circuit; Second level filter circuit output is parallel with clamp circuit.

Again further, described clamp circuit is to be inverted by diode D3 and diode D4 the parallel circuits structure composing in parallel.

Further, described signal amplification circuit filter is made up of ESPA16 chip and peripheral circuit thereof, be provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit are all connected with power amplification circuit; In described ESPA16 chip, be also provided with intermediate reference voltage output circuit.

Further, described power unit is 3.3V power supply, by DC/DC module composition.

Beneficial effect:

Compared with prior art, the low voltage power line carrier chip based on the modulation of OFDM pattern of the present utility model, flank speed reaches 150kbps, and utilizes 128bits AES encryption mechanism, has ensured the fail safe of communication.

Brief description of the drawings

Fig. 1 is system block diagram of the present utility model;

Fig. 2 is SSC1650 circuit structure block diagram of the present utility model;

Fig. 3 is current-limiting circuit circuit theory diagrams of the present utility model;

Fig. 4 is ESPA16 chip periphery circuit theory diagrams of the present utility model;

Fig. 5 is ESPA16 chip structure figure of the present utility model;

Fig. 6 is the circuit theory diagrams of coupling circuit of the present utility model and wave reception filtering circuit;

Fig. 7 is the circuit theory diagrams of zero cross detection circuit of the present utility model;

Fig. 8 is the circuit block diagram of power unit of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further described:

As depicted in figs. 1 and 2, the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern of the present utility model, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit; Stating carrier Control circuit is made up of SSC1650 chip and peripheral circuit; Described SSC1650 chip, this chip comprises ARM core chip, PLL, OFDM base band, AFE, SPI; Described ARM core chip is connected with OFDM base band, SPI by bus; Described chip also comprises SWD ICE, PMU Control, UART, WDT, GPIO, ADC module; Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC module are all connected with ARM core chip by bus; Between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, zero cross detection circuit is connected between carrier Control circuit and power line, and described telecommunication circuit also comprises the power unit to telecommunication circuit power supply.

As shown in Fig. 3, Fig. 6, Fig. 7 and Fig. 8, described current-limiting circuit, signal amplification circuit filter, signal coupling circuit, wave reception filtering circuit and zero cross detection circuit are prior art, do not repeat them here.

As shown in Figure 8, described wave reception filtering circuit comprises two stage filter circuit, and wherein, first order filter circuit connects signal coupling circuit, and second level filter circuit connects carrier Control circuit; Second level filter circuit output is parallel with clamp circuit; Described clamp circuit is to be inverted by diode D3 and diode D4 the parallel circuits structure composing in parallel.

As shown in Figure 4 and Figure 5, described signal amplification circuit filter is made up of ESPA16 chip and peripheral circuit thereof, be provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit are all connected with power amplification circuit; In described ESPA16 chip, be also provided with intermediate reference voltage output circuit.

As shown in Figure 8, described power unit is 3.3V power supply, by DC/DC module composition.

Embodiment recited above is described preferred implementation of the present utility model, not design of the present utility model and scope is limited.Do not departing under the prerequisite of the utility model design concept; various modification and improvement that this area ordinary person makes the technical solution of the utility model; all should drop into protection range of the present utility model; the technology contents of the utility model request protection, has all been documented in claims.

Claims

1. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit, it is characterized in that: described carrier Control circuit is made up of SSC1650 chip and peripheral circuit; Described SSC1650 chip, this chip comprises ARM core chip, PLL, OFDM base band, AFE, SPI; Described ARM core chip is connected with OFDM base band, SPI by bus; Described chip also comprises SWD ICE, PMU Control, UART, WDT, GPIO, ADC module; Described SWD ICE, PMU Control, UART, WDT, GPIO, ADC module are all connected with ARM core chip by bus; Between described carrier Control circuit and signal coupling circuit, be connected with signal amplification circuit filter and wave reception filtering circuit, described signal filtering amplifying circuit is connected with current-limiting circuit, zero cross detection circuit is connected between carrier Control circuit and power line, and described telecommunication circuit also comprises the power unit to telecommunication circuit power supply.

2. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: the resolution of described ADC module is 10.

3. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: described OFDM base band is connected with AFE.

4. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: described carrier Control circuit is connected with interface circuit and indicator light.

5. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, it is characterized in that: wave reception filtering circuit comprises three grades of filter circuits, wherein, first order filter circuit connects signal coupling circuit, and third level filter circuit connects carrier Control circuit; Third level filter circuit output is parallel with clamp circuit.

6. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 3, is characterized in that: clamp circuit is to be inverted by diode D3 and diode D4 the parallel circuits structure composing in parallel.

7. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, it is characterized in that: signal amplification circuit filter is made up of ESPA16 chip and peripheral circuit thereof, be provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit are all connected with power amplification circuit; In described ESPA16 chip, be also provided with intermediate reference voltage output circuit.

8. the low-voltage powerline carrier communication circuit based on the modulation of OFDM pattern according to claim 1, is characterized in that: described power unit is 3.3V power supply, by DC/DC module composition.