CN209417147U - Novel high speed telecommunication circuit and its manufactured measuring instrument - Google Patents

Abstract

The utility model discloses a kind of novel high speed telecommunication circuits, including input current-limiting resistance, isolation optocoupler, output protection module, output signal accelerating module and reshaping signal flip module；The primary side anode of isolation optocoupler connects power supply signal, the primary side cathode connection input signal of communication of isolation optocoupler by the input current-limiting resistance of concatenation；The output end of isolation optocoupler is sequentially connected in series output protection module, output signal accelerating module and reshaping signal flip module；Output protection module protects the output signal of isolation optocoupler and isolation optocoupler；Output signal accelerating module carries out signal acceleration to signal of communication；Reshaping signal flip module exports final isolation output signal of communication after carrying out signal shaping and overturning to signal of communication.The utility model additionally provides the measuring instrument including the novel high speed telecommunication circuit.The utility model is low in cost, and communication is quickly and circuit stability is reliable.

Description

Novel high speed telecommunication circuit and its manufactured measuring instrument

Technical field

The utility model is specifically related to a kind of novel high speed telecommunication circuit and its manufactured measuring instrument.

Background technique

With the development of economic technology, the use of telecommunication circuit in the electronic device is more and more frequent, also in electronic equipment It is middle to have played very important effect.And with the leap of the development of electronic equipment and technology now, electronic equipment is for high speed The demand of telecommunication circuit is more and more vigorous.

Telecommunication circuit be in electronic equipment commonly for carry out equipment and equipment, module and module, chip and chip or Person's equipment, module, the circuit that data interaction is carried out between chip.Currently used telecommunication circuit includes RS485 telecommunication circuit, RS232 telecommunication circuit etc..

The telecommunication circuits such as RS485 when in for measuring instruments such as electric energy meters, generally require to carry out communicating pair electrical Isolation, to guarantee that the electric signal of communicating pair is relatively independent, will not interfere with each other.Currently, for telecommunication circuit every From common isolation scheme is light-coupled isolation, i.e., by way of increasing isolation optocoupler in telecommunication circuit, realizes double to communication The electrical isolation of side.

There are many traffic rates of telecommunication circuit, such as 9600bps, 19200bps, 57600bps etc..But due to every The response speed of presence from optocoupler, isolation optocoupler is relatively slow, so that the traffic rate of most of isolation telecommunication circuit It is restricted to 9600bps.Meanwhile if to improve the traffic rate of isolation telecommunication circuit, high speed photo coupling is needed replacing.But The use of high speed photo coupling can greatly improve the cost of telecommunication circuit.

Utility model content

One of the purpose of this utility model is to provide a kind of low in cost and quick novel high speed telecommunication circuit of communication.

The two of the purpose of this utility model are to provide a kind of measuring instrument, and the measuring instrument includes described novel High-speed communication circuit.

This novel high speed telecommunication circuit provided by the utility model, including input current-limiting resistance and isolation optocoupler, are also wrapped Include output protection module, output signal accelerating module and reshaping signal flip module；The primary side anode of isolation optocoupler passes through concatenation Input current-limiting resistance connect power supply signal, isolation optocoupler primary side cathode connection input signal of communication；The output of isolation optocoupler End is sequentially connected in series output protection module, output signal accelerating module and reshaping signal flip module；Output protection module for pair The output signal of isolation optocoupler and isolation optocoupler is protected；Output signal accelerating module is used for the communication exported to isolation optocoupler Signal carries out signal acceleration；It is defeated after reshaping signal flip module is used to carry out signal shaping and overturning to signal of communication after acceleration Final isolation exports signal of communication out.

The output protection module is current-limiting resistance；The output end collector of isolation optocoupler connects power supply signal, isolation The output end emitter of optocoupler is grounded by current-limiting resistance, while the output end emitter connection output signal of isolation optocoupler accelerates Module.

The reshaping signal flip module includes triode and triode pull-up resistor；The ground level of triode is as shaping The input terminal of signal flip module connects output signal accelerating module, and the emitter of triode is directly connected to earth signal, triode Collector power supply signal is connected by the pull-up resistor of concatenation, while the collector of triode is also used as reshaping signal turning mould The output end of block exports final isolation output signal of communication.

The output signal accelerating module includes accelerating resistor and speed-up capacitor in parallel；Accelerating resistor and speed-up capacitor Parallel connection, while one end of accelerating resistor connects output protection module as input terminal, the other end of accelerating resistor is as output end Connect reshaping signal flip module；For limiting the electric current for flowing through output signal accelerating module, speed-up capacitor is used for accelerating resistor The transmission of acceleration signals.

The speed-up capacitor be used for acceleration signals transmission, specially speed-up capacitor be used for accelerate triode conducting and Cut-off, to accelerate the transmission process of signal.

In the allowed band of the transfer ratio of isolation optocoupler, the resistance value of accelerating resistor is smaller, and the shutdown delay of triode is got over Small, the transmission of signal of communication is faster.

The utility model additionally provides a kind of measuring instrument, which includes the novel high speed communication electricity Road.

This novel high speed telecommunication circuit provided by the utility model and its measuring instrument, pass through output signal accelerating module Acceleration, realize the high-speed traffic of isolation telecommunication circuit, and increased signal accelerating module is low in cost, therefore The utility model is low in cost, and communication is quickly and circuit stability is reliable.

Detailed description of the invention

Fig. 1 is the functional block diagram of the utility model.

Fig. 2 is the circuit theory schematic diagram of the embodiments of the present invention.

Specific embodiment

It is as shown in Figure 1 the functional block diagram of the utility model: this novel high speed communication electricity provided by the utility model Road, including input current-limiting resistance and isolation optocoupler, further include that output protection module, output signal accelerating module and reshaping signal turn over Revolving die block；The primary side anode of isolation optocoupler connects power supply signal by the input current-limiting resistance of concatenation, and the primary side of isolation optocoupler is negative Pole connection input signal of communication；The output end of isolation optocoupler is sequentially connected in series output protection module, output signal accelerating module and whole Shape signal flip module；Output protection module is for protecting the output signal of isolation optocoupler and isolation optocoupler；Output letter The signal of communication progress signal acceleration that number accelerating module is used to export isolation optocoupler；Reshaping signal flip module is used for acceleration After signal of communication carries out signal shaping and overturning afterwards, final isolation output signal of communication is exported.

It is illustrated in figure 2 the circuit theory schematic diagram of the embodiments of the present invention: the model of isolation optocoupler in the figure LTV816S, input current-limiting resistance are R1 (resistance value is 1.5k Ω), and input signal of communication is IN_TXD.

Output protection module is current-limiting resistance R2 (270 Ω)；The output end collector of isolation optocoupler connects power supply signal V_ 303, the output end emitter of isolation optocoupler is grounded (GND0) by current-limiting resistance, while the output end emitter of isolation optocoupler connects Connect output signal accelerating module.

Reshaping signal flip module includes triode Q1 and triode pull-up resistor R4；The ground level of triode is believed as shaping The input terminal of number flip module connects output signal accelerating module, and the emitter of triode is directly connected to earth signal, triode Collector connects power supply signal by the pull-up resistor of concatenation, while the collector of triode is also used as reshaping signal flip module Output end export final isolation output signal of communication；The resistance value of the model LBC817 of triode Q1, resistance R4 are 5.1k Ω。

Output signal accelerating module includes that (capacitance is by parallel accelerating resistor R3 (resistance value is 10k Ω) and speed-up capacitor C1 0.01uF)；Accelerating resistor and speed-up capacitor are in parallel, while one end of accelerating resistor connects output protection module as input terminal, The other end of accelerating resistor connects reshaping signal flip module as output end；Accelerating resistor flows through output signal for limitation and adds The electric current of fast module, speed-up capacitor are used for the transmission of acceleration signals.

The working principle of circuit as shown in Figure 2 is as follows: when input signal IN_TXD is low level, isolation optocoupler primary side Conducting, the secondary side of isolation optocoupler is also switched at this time, and power supply signal passes through the ground level of resistance R3 connection Q1 at this time, and Q1 is connected at this time, Output signal OUT_TXD is pulled low to low level；Under this kind of state, when input signal is low level, output signal is also low Level；

When input signal IN_TXD is high level, the cut-off of isolation optocoupler primary side, the secondary side of isolation optocoupler is also switched off at this time, Power supply signal can not access circuit, triode Q1 cut-off at this time, and output signal OUT_TXD is pulled up resistance R4 and draws high supreme electricity It is flat；Under this kind of state, when input signal is high level, output signal is also high level.

Therefore, the transmission of signal of communication may be implemented in circuit shown in Fig. 2.

In addition, the phototriode inside optocoupler is by ending when input signal IN_TXD becomes low level from high level State enters saturation state, and there are the regular hours, at this point, capacitor C1 charges rapidly, electric current from left to right, the electricity of capacitor right end Pressure ratio left end is low, to accelerate the turn-on time of triode；When transmission signal IN_TXD becomes high level from low level, light Phototriode inside coupling by saturation state enters off state, and there are the regular hours, at this point, capacitor C1 discharges rapidly, electricity From right to left, capacitor right end voltage is low compared with left end, to accelerate the deadline of triode Q1 for stream.Therefore, speed-up capacitor C1 Presence, keep the rising edge of signal of communication and failing edge more precipitous, thus realize signal it is quick transmitting and communication.

Meanwhile in optocoupler transfer ratio allowed band, reduction R2 resistance value can reduce triode shutdown delay, energy as far as possible Enough further increase the working frequency that can be transmitted.

In addition, the performance indicator of circuit shown in Fig. 2 is as follows by specific experiment:

1 circuit important performance indexes of table

In addition, as follows by experiment and theory analysis, the limiting performance index of circuit shown in Fig. 2:

2 circuit limiting performance index of table

From above table, it can be seen that, this circuit provided by the utility model, traffic rate be can achieve 57600bps greatly improves the traffic rate of existing isolation telecommunication circuit, and the increased circuit devcie of institute is relatively simple Single, so that cost is more cheap, and circuit is reliable.

This novel high speed telecommunication circuit provided by the present application can be used for the electronics that other any need carry out high-speed communication Equipment, including all types of measuring instruments (such as electric energy meter, water meter, gas meter, flow meter, calorimeter etc.), electric energy management terminal, distribution Terminal, electric energy quality monitoring equipment, grid automation terminal, acquisition terminal, concentrator, data collector, measuring instrument, write by hand Device, fault detector etc..

Claims (7)

1. a kind of novel high speed telecommunication circuit, it is characterised in that further include that output is protected including input current-limiting resistance and isolation optocoupler Protect module, output signal accelerating module and reshaping signal flip module；The input limit that the primary side anode of isolation optocoupler passes through concatenation Leakage resistance connects power supply signal, the primary side cathode connection input signal of communication of isolation optocoupler；The output end of isolation optocoupler is successively gone here and there Connect output protection module, output signal accelerating module and reshaping signal flip module；Output protection module is used for isolation optocoupler It is protected with the output signal of isolation optocoupler；The signal of communication that output signal accelerating module is used to export isolation optocoupler carries out Signal accelerates；After reshaping signal flip module is used to carry out signal shaping and overturning to signal of communication after acceleration, export final Isolation output signal of communication.

2. novel high speed telecommunication circuit according to claim 1, it is characterised in that the output protection module is current limliting Resistance；The output end collector of isolation optocoupler connects power supply signal, and the output end emitter of isolation optocoupler is connect by current-limiting resistance Ground, while the output end emitter of isolation optocoupler connects output signal accelerating module.

3. novel high speed telecommunication circuit according to claim 1 or 2, it is characterised in that the reshaping signal flip module Including triode and triode pull-up resistor；Input terminal connection output letter of the ground level of triode as reshaping signal flip module Number accelerating module, the emitter of triode are directly connected to earth signal, the pull-up resistor connection that the collector of triode passes through concatenation Power supply signal, while to be also used as the output end of reshaping signal flip module to export final isolation output logical for the collector of triode Believe signal.

4. novel high speed telecommunication circuit according to claim 3, it is characterised in that the output signal accelerating module packet Include accelerating resistor and speed-up capacitor in parallel；Accelerating resistor and speed-up capacitor are in parallel, while one end of accelerating resistor is as input End connection output protection module, the other end of accelerating resistor connect reshaping signal flip module as output end；Accelerating resistor is used The electric current of output signal accelerating module is flowed through in limitation, speed-up capacitor is used for the transmission of acceleration signals.

5. novel high speed telecommunication circuit according to claim 4, it is characterised in that the speed-up capacitor is for accelerating letter Number transmission, specially speed-up capacitor is used to accelerate the on and off of triode, to accelerate the transmission process of signal.

6. novel high speed telecommunication circuit according to claim 4, it is characterised in that in the permission of the transfer ratio of isolation optocoupler In range, the resistance value of accelerating resistor is smaller, and the shutdown delay of triode is smaller, and the transmission of signal of communication is faster.

7. a kind of measuring instrument, it is characterised in that include novel high speed telecommunication circuit described in one of claim 1~6.