CN211014430U - 10KV high-isolation two-wire passive VI conversion transmitter - Google Patents

Abstract

The utility model discloses a 10KV high isolation two line passive form VI conversion changer, the V/I converting circuit, signal plus-minus circuit and current signal demodulation circuit link to each other in proper order, zero gain control circuit links to each other with signal plus-minus circuit, current signal demodulation circuit passes through rectification filter circuit and links to each other with DC-DC keeps apart power supply circuit, DC-DC keeps apart power supply circuit and links to each other with steady voltage distribution output circuit, be provided with the high isolation circuit of signal coupling between current signal demodulation circuit and the current signal modulation circuit 9, current signal modulation circuit links to each other with return circuit supply current output circuit. The utility model discloses guaranteed that product signal input/output realizes 10KVAC high isolation, the product design is the fire-retardant IC encapsulation of low cost, small size's standard SIP16Pin, keeps apart converting circuit integration together such as V/I, I I, not only can keep apart the transmission to the voltage or the electric current signal of sensor input, and the plus-minus circuit can also handle input area zero offset and two-way signal.

Description

10KV high-isolation two-wire passive VI conversion transmitter

Technical Field

The utility model relates to an industrial automation measures the measurement and control field, be industrial control intelligent system, rail transit, the best high isolation solution of data acquisition analog signal isolation transmission such as medical equipment, in field wide application such as track voltage control, generator or motor safe operation monitoring, electric power transmission and distribution remote monitoring, instrument and meter and sensor signal receiving and dispatching, medical equipment safety barrier, industrial automation control, nuclear power equipment, concretely relates to 10KV high isolation two line passive form VI conversion changer.

Background

With the development of science and technology, the requirements on remote monitoring equipment in the fields of industrial sites, power monitoring, medical equipment, experimental research and the like are more and more. The isolation and pressure resistance, the control precision, the anti-interference capability, the safety and reliability, the high efficiency, the energy conservation and the environmental protection, the application cost reduction, the intelligent degree, the installation mode and the like of the remote equipment control module have higher requirements. At present, the isolation pressure-resistant strength of high-end products of signal isolators at home and abroad reaches 3000VDC/min, the isolation pressure-resistant strength of mainstream products reaches 2500VDC/min, and the isolation pressure-resistant strength of a conventional signal isolator is 1000-2000 VDC/min. However, these products can only meet the application of part of products with low isolation and pressure resistance requirements, and are insufficient for the application of part of products with higher isolation and pressure resistance requirements on the field. For example, many power data acquisition applications require isolation voltages of at least 3000VDC, even above 4000VAC, and medical applications typically require 4000VAC or 6000VDC, or even higher. As we know, the market at present has the requirement of high isolation withstand voltage, but no analog quantity signal isolation product with correspondingly higher isolation withstand voltage exists.

In the monitoring and control fields of industry, electric power, medical treatment and the like, an analog signal high-voltage-resistance isolation and conversion device plays an increasingly important role, and in order to realize the application of signal matching of a sensor used in a general industrial field, the conversion of an output analog signal is required besides the consideration of a ground wire surrounding factor. If a special active conversion device is purchased for the conversion of the output signals, the isolation voltage resistance is low, the price is high, the volume is large, the power consumption is large, the heat generation amount is high, the field use is not very convenient, two power lines are required to be added, the field wiring is complicated, and the wiring cost is increased. Due to the long-distance transmission of signals, the voltage difference between the upper computer and the ground wire of the execution equipment of the measured signals can reach dozens, hundreds or even thousands of volts, if the signals are not isolated, the direct conversion can cause phenomena of inaccurate data, jumping and the like, and the equipment can be damaged or even personal injury can be caused in serious cases, so that isolation measures must be taken.

To sum up, the utility model designs a 10KV high isolation two line passive form VI conversion changer.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to exist on the prior art, the utility model aims to provide a 10KV height keeps apart two line passive form VI conversion changer, the isolation measure and the wide creepage distance that have adopted the high performance and the design of new barrier material technical scheme, it realizes 10KVAC high isolation to have guaranteed product signal input output, the product design is low cost, the fire-retardant IC encapsulation of standard SIP16Pin of small volume, keep apart converting circuit integration together such as V/I, I/I, not only can keep apart the transmission to the voltage or the current signal of sensor input, add and subtract the circuit and can also handle input area zero point bias and two-way signal, satisfy various sensors, changer signal conversion demand, and the product miniaturization has been realized.

In order to achieve the above purpose, the present invention is realized by the following technical solution: a10 KV high-isolation two-wire passive VI conversion transmitter comprises a V/I conversion circuit, a signal adding and subtracting circuit, a zero gain adjusting circuit, a current signal demodulating circuit and a rectifying and filtering circuit, the DC-DC isolation power supply circuit, the voltage stabilization distribution output circuit, the signal coupling high isolation circuit, the current signal modulation circuit and the loop power supply current output circuit are sequentially connected, the V/I conversion circuit, the signal add-subtract circuit and the current signal demodulation circuit are sequentially connected, the zero gain adjustment circuit is connected with the signal add-subtract circuit, the current signal demodulation circuit is connected with the DC-DC isolation power supply circuit through the rectification filter circuit, the DC-DC isolation power supply circuit is connected with the voltage stabilization distribution output circuit, the signal coupling high isolation circuit is arranged between the current signal demodulation circuit and the current signal modulation circuit 9, and the current signal modulation circuit is connected with the loop power supply current output circuit.

Preferably, the V/I conversion circuit employs a first amplifier AD 8512.

Preferably, the signal coupling high isolation circuit adopts a transformer, and the transformer is connected with the combining transistor XN4601 through a second inductor.

Preferably, the DC-DC isolation power supply circuit adopts a power supply inverter chip XC 6351A.

Preferably, the voltage-stabilizing power distribution output circuit is further connected with an IV conversion circuit, and the IV conversion circuit adopts a chip model of XTR 115.

The utility model has the advantages of the utility model discloses select high performance isolation device for use, adopted high performance isolation measure and wide creepage distance and the design of new isolation material technical scheme, guaranteed that product signal input output realizes 10KVAC high isolation, the product design is low cost, the fire-retardant IC encapsulation of standard SIP16Pin of small volume, keep apart conversion circuit integration such as V/I, I/I together, not only can keep apart the transmission to the voltage or current signal of sensor input, add and subtract the circuit and can also handle zero point offset and two-way signal to the input area, satisfy various sensors, changer signal conversion demand, and realize the product miniaturization, the product adopts high-effect return circuit electricity stealing technique, IC self need not independent power supply, the utility model discloses still can pass through back level current loop feed mode, provide a set of 5V (3mA) function expansion power supply for the input and supply power for two-wire equipments, and receive the voltage current signal that comes from the output of transmitter, output 4 ~ 20mA standard system current signal after isolation conversion, the product has output voltage range of wide (12-36 power supply voltage conversion), the zero point provides the linear expansion power supply for the zero point, the high voltage output of a set of two-line extension power supply device, the high voltage output signal, the high voltage output of the integrated circuit, the high voltage of the output signal of two-line voltage-line type signal, the high voltage-load-type load-load.

Drawings

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments;

FIG. 1 is a schematic block diagram of the structure of the present invention;

fig. 2 is a schematic circuit diagram of the present invention.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

Referring to fig. 1-2, the following technical solutions are adopted in the present embodiment: a10 KV high-isolation two-wire passive VI conversion transmitter comprises a V/I conversion circuit 1, a signal add-subtract circuit 2, a zero gain adjusting circuit 3, a current signal demodulation circuit 4, a rectifying and filtering circuit 5, a DC-DC isolation power supply circuit 6, a voltage-stabilizing distribution output circuit 7, a signal coupling high-isolation circuit 8, a current signal modulation circuit 9 and a loop power supply current output circuit 10, wherein the V/I conversion circuit 1, the signal add-subtract circuit 2 and the current signal demodulation circuit 4 are sequentially connected, the zero gain adjusting circuit 3 is connected with the signal add-subtract circuit 2, the current signal demodulation circuit 4 is connected with the DC-DC isolation power supply circuit 6 through the rectifying and filtering circuit 5, the DC-DC isolation power supply circuit 6 is connected with the voltage-stabilizing distribution output circuit 7, the signal coupling high-isolation circuit 8 is arranged between the current signal demodulation circuit 4 and the current signal modulation circuit 9, the current signal modulation circuit 9 is connected to the loop supply current output circuit 10.

It should be noted that the V/I conversion circuit 1 employs a first amplifier AD 8512.

It should be noted that the signal coupling high isolation circuit 8 employs a transformer T3, and the transformer T3 is connected to the combination transistor XN4601 through a second inductor L2.

It is noted that the DC-DC isolated power circuit 6 employs a power inverter chip XC 6351A.

In addition, the voltage-stabilizing power distribution output circuit 7 is also connected with an IV conversion circuit, and the IV conversion circuit adopts a chip model of XTR 115.

The specific implementation mode adopts a high-performance isolation technology and a plurality of conversion technical schemes to integrate circuits on the same chip, so as to realize the isolation transmission conversion of the V/I, I/I signal. The product adopts a high-efficiency loop electricity stealing technology, does not need an independent power supply to supply power, and takes energy from an output loop. The output circuit of the product is designed in a mode of 4-20mA current loop output by adopting a two-wire loop power supply, a self-excited oscillation circuit modulates loop current signals, then the loop current signals are coupled by a specially processed high-isolation voltage-withstanding transformer to realize 10KVAC isolation, a demodulation circuit demodulates the signals, and the signals are connected with an input circuit through a rectification filter circuit. The input V/I conversion circuit converts input voltage or current signals, and part of the signals need to be subjected to add-on processing through an add-drop circuit to linearly control an output current loop. The rectification filter circuit demodulates signals and provides energy for the DC-DC power supply, the DC-DC power supply completes inversion of power supply voltage and provides power distribution power supply output to the input end circuit or the sensor for power supply, and the zero gain adjusting circuit calibrates zero and full values of output current signals to realize high-precision V/I isolation conversion.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. The 1.10KV high-isolation two-wire passive VI conversion transmitter is characterized by comprising a V/I conversion circuit (1), a signal adding and subtracting circuit (2), a zero gain adjusting circuit (3), a current signal demodulating circuit (4), a rectifying filter circuit (5), a DC-DC isolation power supply circuit (6), a voltage-stabilizing power distribution output circuit (7), a signal coupling high-isolation circuit (8), a current signal modulating circuit (9) and a loop power supply current output circuit (10), wherein the V/I conversion circuit (1), the signal adding and subtracting circuit (2) and the current signal demodulating circuit (4) are sequentially connected, the zero gain adjusting circuit (3) is connected with the signal adding and subtracting circuit (2), the current signal demodulating circuit (4) is connected with the DC-DC isolation power supply circuit (6) through the rectifying filter circuit (5), and the DC-DC isolation power supply circuit (6) is connected with the voltage-stabilizing output circuit (7), a signal coupling high isolation circuit (8) is arranged between the current signal demodulation circuit (4) and the current signal modulation circuit (9), and the current signal modulation circuit (9) is connected with a loop power supply current output circuit (10).
2. 2. The 10KV high isolation two-wire passive VI conversion transmitter of claim 1, wherein the V/I conversion circuit (1) employs a first amplifier AD 8512.
3. 3. The 10KV high isolation two-wire passive VI conversion transmitter of claim 1, wherein the signal coupling high isolation circuit (8) employs a transformer (T3), and the transformer (T3) is connected to the combination transistor XN4601 through a second inductor (L2).
4. 4. The 10KV high isolation two-wire passive VI conversion transmitter according to claim 1, wherein the DC-DC isolation power circuit (6) employs a power inverter chip XC 6351A.
5. 5. The 10KV high-isolation two-wire passive VI conversion transmitter according to claim 1, wherein the voltage-stabilizing power distribution output circuit (7) is further connected with an IV conversion circuit, and the IV conversion circuit adopts a chip model of XTR 115.

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