CN103795441A

CN103795441A - BFSK, BPSK and DBPSK mode modulation-based low-voltage power line carrier communication circuit

Info

Publication number: CN103795441A
Application number: CN201310671589.3A
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: 2014-05-14
Anticipated expiration: 2033-12-12
Also published as: CN103795441B

Abstract

The invention discloses a BFSK, BPSK and DBPSK mode modulation-based low-voltage power line carrier communication circuit. The circuit comprises a carrier control circuit, a zero crossing detection circuit and a signal coupling circuit; the carrier control circuit is composed of an SSC1643 chip and a peripheral circuit; a signal amplifying filtering circuit and a receiving filtering circuit are connected between the carrier control circuit and the signal coupling circuit; the signal amplifying filtering circuit is connected with a current limiting circuit; the zero crossing detection circuit is connected between the carrier control circuit and a power line; and the communication circuit further comprises a power supply part for providing power for the communication circuit. According to the BFSK, BPSK and DBPSK mode modulation-based low-voltage power line carrier communication circuit of the invention, support of BFSK and DBPSK is additionally realized, communication can be arbitrarily adjusted in a range of 10 to 500kHz, and therefore, the application of the communication circuit can be more flexible; a low-power consumption LDO is adopted in the power supply part, and therefore, electric energy can be saved largely.

Description

A kind of low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK pattern

Technical field

The present invention relates to a kind of power carrier communication circuit, be specifically related to a kind of low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK 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.Circuit of the present invention 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, as shown in Figure 2 and Figure 7, only support BFSK communication mode, and can only realize the carrier communication of 270kHz, for there being other frequency range requirements, and the place of other modulation systems requirements can not meet and need additional EEPROM, wave reception filtering circuit of the present invention to protect diode to be arranged on the 2nd grade, protection effect is good not; And power circuit current drain is 3mA, and loss ratio is higher.

Summary of the invention

For addressing the above problem, the object of the invention is in a kind of low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK pattern is provided, solve the problem that existing low voltage power line carrier chip can not carry out BPSK and DBPSK modulation, increased the frequency range of carrier communication simultaneously.

For achieving the above object, the technical solution adopted in the present invention is: a kind of low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK pattern, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit, and described carrier Control circuit is made up of SSC1643 chip and peripheral circuit; Described chip comprises that low noise amplifier LNA, Low Medium Frequency signal that ARM kernel, FSK, PSK and DBPSK modulation /demodulation module, gain are controlled amplify PGA and UART; Described ARM kernel is connected with FSK, PSK and DBPSK modulation /demodulation module by bus; Described low noise amplifier LNA amplifies PGA with Low Medium Frequency signal and is connected with ARM kernel 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, described carrier Control circuit is connected with interface circuit and indicator light.

Further, described wave reception filtering circuit comprises three grades of filter circuits, and 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.

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, is provided with power amplification circuit, current foldback circuit, thermal-shutdown circuit and under-voltage protecting circuit, current foldback circuit,

Thermal-shutdown circuit is all connected with power amplification circuit with under-voltage protecting circuit; In described ESPA16 chip, be also provided with intermediate reference voltage output circuit.

Further, described power unit is 3.3V or 5V power supply, and by low-power consumption, LDO forms.

Beneficial effect:

For addressing the above problem, the object of the invention is in a kind of low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK pattern is provided, solve the problem that existing low voltage power line carrier chip can not carry out BPSK and DBPSK modulation, increased the frequency range of carrier communication simultaneously, carrier frequency input range is widened as 10k-500kHz, can do compatible design with arrowband low speed power line carrier scheme.

Accompanying drawing explanation

Fig. 1 is system block diagram of the present invention;

Fig. 2 is the SSC1641 circuit theory diagrams of prior art;

Fig. 3 is SSC1643 circuit theory diagrams of the present invention;

Fig. 4 is current-limiting circuit circuit theory diagrams of the present invention;

Fig. 5 is ESPA16 chip periphery circuit theory diagrams of the present invention;

Fig. 6 is ESPA16 chip structure figure of the present invention;

Fig. 7 is the coupling circuit of prior art and the circuit theory diagrams of wave reception filtering circuit;

Fig. 8 is the circuit theory diagrams of coupling circuit of the present invention and wave reception filtering circuit;

Fig. 9 is the circuit theory diagrams of zero cross detection circuit of the present invention;

Figure 10 is the circuit block diagram of power unit of the present invention;

Figure 11 is BFSK modulation system schematic diagram of the present invention;

Figure 12 is BPSK modulation system schematic diagram of the present invention;

Figure 13 is DBPSK modulation system schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention will be further described:

As shown in Figure 1, low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK pattern of the present invention, this circuit comprises carrier Control circuit, zero cross detection circuit and signal coupling circuit, and described carrier Control circuit is made up of SSC1643 chip and peripheral circuit; Described chip comprises that low noise amplifier LNA, Low Medium Frequency signal that ARM kernel, FSK, PSK and DBPSK modulation /demodulation module, gain are controlled amplify PGA and UART; Described ARM kernel is connected with FSK, PSK and DBPSK modulation /demodulation module by bus; Described low noise amplifier LNA amplifies PGA with Low Medium Frequency signal and is connected with ARM kernel 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.

Described SSC1643 is the power line carrier communication chip of a high integration, inner integrated 32 ARM Cortex MO cores and BFSK/BPSK/DBPSK transceiver; MCU core realizes data EDC error detection and correction, protocol stack, data processing and external unit control; BFSK/BPSK/DBPSK Transceiver completes the code element transmitting-receiving of physical layer.SSC1643 chip adopts hybrid digital-analog integrated circuit design, gain and the low-noise characteristic of performance analog circuit to small-signal; Employing adaptive-filtering design, in 10～500kHz, the setting of can programming arbitrarily of carrier communication frequency; Dynamic range of signals 80dB; The low noise amplifier LNA of integrated high performance gain control and Low Medium Frequency signal amplify PGA, the integrated FSK of internal height, PSK and DBPSK modulation /demodulation module; Described carrier Control circuit is connected with interface circuit and indicator light.

As shown in Fig. 4, Fig. 5, Fig. 6, Fig. 8 and Fig. 9, 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 three grades of filter circuits, and 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; , described clamp circuit is to be inverted by diode D3 and diode D4 the parallel circuits structure composing in parallel.

As shown in Figure 5 and Figure 6, 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 10, described power unit is 3.3 or 5V power supply, and by low-power consumption, LDO forms.

As shown in figure 11, BFSK signal frequency has two kinds, and one represents 1 (mark), and one represents 0 (space), carrys out transmission of digital signals by changing carrier frequency.

As shown in figure 12, BPSK has used the sine wave of benchmark and the wave of phasing back, and making a side is 0,

The opposing party is 1, thereby can transmit the information of accepting 2 values (1 bit) simultaneously.

As shown in figure 13, DBPSK is difference BPSK, is the incoherent form of phase shift keying, and it need to not recover coherent reference signal at receiver end; Noncoherent receiver is easily manufactured and is cheap, therefore in wireless communication system, is widely used; In DBPSK system, the first differential coding of the binary sequence of input, and then use BPSK modulators modulate; { an} is by carrying out mould 2 and computing generation to input bn and an-1 for sequence after differential coding; If input binary character bn be 0, then symbol an symbol previous with it remains unchanged, and if bn is 1, an is contrary with its previous symbol

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

Claims

1. the low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK 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 SSC1643 chip and peripheral circuit; Described chip comprises that low noise amplifier LNA, Low Medium Frequency signal that ARM kernel, FSK, PSK and DBPSK modulation /demodulation module, gain are controlled amplify PGA and UART; Described ARM kernel is connected with FSK, PSK and DBPSK modulation /demodulation module by bus; Described low noise amplifier LNA amplifies PGA with Low Medium Frequency signal and is connected with ARM kernel 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 BFSK, BPSK, the modulation of DBPSK pattern according to claim 1, is characterized in that: described carrier Control circuit is connected with interface circuit and indicator light.

3. the low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK 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.

4. the low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK 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.

5. the low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK 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.

6. the low-voltage powerline carrier communication circuit based on BFSK, BPSK, the modulation of DBPSK pattern according to claim 1, is characterized in that: described power unit is 3.3V or 5V power supply, and by low-power consumption, LDO forms.