CN111464175B - 10-kilovolt high-voltage-resistant analog signal isolation circuit - Google Patents
10-kilovolt high-voltage-resistant analog signal isolation circuit Download PDFInfo
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- CN111464175B CN111464175B CN202010300993.XA CN202010300993A CN111464175B CN 111464175 B CN111464175 B CN 111464175B CN 202010300993 A CN202010300993 A CN 202010300993A CN 111464175 B CN111464175 B CN 111464175B
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Abstract
The embodiment of the application discloses a 10 kilovolt high-voltage-resistant analog signal isolation circuit. The circuit comprises: the V/I conversion circuit comprises a first input interface and a first output interface, the first input interface is connected to the external input circuit, and the V/I conversion circuit is used for converting a first voltage signal input by the external input circuit into a first current signal; the isolation circuit comprises a second input interface and a second output interface, the second input interface is connected with the first output interface, and the isolation circuit is used for isolating the first current signal to generate a target current signal; the current output circuit comprises a third input interface and a third output interface, the third input interface is connected with the second input interface, and the current output circuit is used for receiving the target current signal and outputting the target current signal to the external output circuit through the third output interface. The embodiment of the application realizes high-precision and high-linearity 10KV anti-EMC high-isolation transmission and V/I conversion.
Description
Technical Field
The embodiment of the application relates to an industrial automatic measurement and control technology, in particular to a 10 kilovolt high voltage-resistant analog signal isolation circuit.
Background
Along with the development of scientific technology, the fields of industrial sites, electric power monitoring, medical equipment, test research and the like have more and more requirements on remote monitoring equipment, and have higher requirements on isolation pressure resistance, control precision, anti-interference capability, safety reliability, high efficiency, energy conservation, environmental protection, application cost reduction, intelligent degree, installation mode and the like of a remote equipment control module.
Because the signals are transmitted in long distance, the voltage difference between the tested signals, the upper computer and the ground wire of the execution equipment can reach tens, hundreds or even thousands of volts, if the signals are not isolated and directly converted, the phenomena of inaccurate data, jumping and the like exist, and the equipment can be damaged even personal injury is caused in serious cases, so that isolation measures are necessary. Therefore, the analog signal high voltage isolation conversion device plays an increasingly important role, and in order to realize the application of signal matching in the sensor used in the general industrial field, the conversion of the output analog signal is required to be performed in addition to the consideration of the ground wire surrounding factor. If the special active conversion equipment is purchased, the conversion of the output signal has the advantages of low isolation voltage, high price, large volume, large power consumption, high heat generation and inconvenient field use, two power lines are required to be added, so that the field wiring becomes complex, and the wiring cost is increased.
At present, the isolation compressive strength of high-end products of signal isolators at home and abroad reaches 3000VDC/min, the isolation compressive strength of main stream reaches 2500VDC/min, and the isolation compressive strength of conventional signal isolators is 1000-2000VDC/min. However, these products can only meet the application of partial low-isolation pressure-resistant products, but are insufficient for the application of partial field products with higher isolation pressure-resistant requirements. For example, many data acquisition applications of power require an isolated voltage of at least 3000VDC, even more than 4000VAC, and medical applications typically require 4000VAC or 6000VDC, or even higher. The current market has the requirement of high isolation withstand voltage, but no analog quantity signal isolation product with correspondingly higher isolation withstand voltage exists.
Disclosure of Invention
The embodiment of the application provides a 10KV high voltage withstand analog signal isolation circuit, which is used for realizing high-precision and high-linearity 10KV high-isolation transmission and V/I conversion of 4-20mA signals between an industrial field sensor and an instrument and meter, as well as between a Programmable Logic Controller (PLC) and a Distributed Control System (DCS).
To achieve the object, an embodiment of the present application provides a 10kv high withstand voltage analog signal isolation circuit, the analog signal isolation circuit comprising:
the V/I conversion circuit comprises a first input interface and a first output interface, wherein the first input interface is connected to an external input circuit, and the V/I conversion circuit is used for converting a first voltage signal input by the external input circuit into a first current signal;
the isolation circuit comprises a second input interface and a second output interface, the second input interface is connected with the first output interface, and the isolation circuit is used for isolating the first current signal to generate a target current signal;
the current output circuit comprises a third input interface and a third output interface, the third input interface is connected with the second input interface, and the current output circuit is used for receiving the target current signal and outputting the target current signal to an external output circuit through the third output interface.
Furthermore, the current output circuit adopts a two-wire loop power supply loop output form, and is further used for converting the target current signal into a loop current signal so as to supply power for the external input circuit.
Further, the analog signal isolation circuit further includes:
the power distribution output circuit comprises a fourth input interface and a fourth output interface, the fourth input interface is connected with the second input interface, and the power distribution output circuit is used for receiving a loop current signal returned by the current output circuit through the isolation circuit and outputting the loop current signal to the external input circuit through the fourth output interface so as to supply power.
Further, the analog signal isolation circuit further includes:
the direct current conversion circuit comprises a fifth input interface and a fifth output interface, the fifth input interface is connected with the second input interface, the fifth output interface is connected with the fourth input interface, and the direct current conversion circuit is used for receiving a loop current signal returned by the current output circuit through the isolation circuit, rectifying and inverting the loop current signal and sending the loop current signal to the power distribution output circuit.
Further, the analog signal isolation circuit further includes:
the rectification filter circuit comprises a sixth input interface and a sixth output interface, the sixth input interface is connected with the second input interface, the sixth output interface is connected with the fifth input interface, and the rectification filter circuit is used for receiving a loop current signal returned by the current output circuit through the isolation circuit, rectifying and filtering the loop current signal and sending the loop current signal to the direct current conversion circuit.
Further, the analog signal isolation circuit further includes:
the first modulation-demodulation circuit comprises a seventh input interface and a seventh output interface, the seventh input interface is connected with the first output interface, the seventh output interface is connected with the second input interface, and the first modulation-demodulation circuit is used for modulating the target current signal;
the second modem circuit comprises an eighth input interface and an eighth output interface, the eighth input interface is connected with the second output interface, the eighth output interface is connected with the third input interface, and the second modem circuit is used for demodulating the target current signal.
Further, the first modem circuit further includes a first interface, the first interface is connected to the sixth input interface, the second modem circuit is further configured to modulate the loop current signal, and the first modem circuit is further configured to demodulate the loop current signal.
Further, the analog signal isolation circuit further includes:
the signal adding and subtracting circuit comprises a ninth input interface and a ninth output interface, the ninth input interface is connected with the first output interface, the ninth output interface is connected with the seventh input interface, and the signal adding and subtracting circuit is used for adding and subtracting the first current signal.
Further, the signal adding and subtracting circuit further comprises a second interface, the direct current conversion circuit further comprises a third interface, and the direct current conversion circuit is further used for providing working voltage for the signal adding and subtracting circuit.
Further, the analog signal isolation circuit further includes:
the zero gain adjusting circuit comprises a fifth interface, the signal adding and subtracting circuit further comprises a fourth interface, the fourth interface is connected with the fifth interface, and the zero gain adjusting circuit is used for calibrating zero and full-scale values of the first current signal.
The embodiment of the application discloses a V/I conversion circuit, which comprises a first input interface and a first output interface, wherein the first input interface is connected to an external input circuit, and the V/I conversion circuit is used for converting a first voltage signal input by the external input circuit into a first current signal; the isolation circuit comprises a second input interface and a second output interface, the second input interface is connected with the first output interface, and the isolation circuit is used for isolating the first current signal to generate a target current signal; the current output circuit comprises a third input interface and a third output interface, the third input interface is connected with the second input interface, the current output circuit is used for receiving the target current signal and outputting the target current signal to an external output circuit through the third output interface, the problem that an analog quantity signal isolation product with higher isolation withstand voltage is not available is solved, and the effects of high-precision and high-linearity 10KV anti-EMC high-isolation transmission and V/I conversion of 4-20mA signals between an industrial field sensor and instruments, a PLC and a DCS are achieved.
Drawings
Fig. 1 is a schematic circuit diagram of a 10kv high voltage resistant analog signal isolation circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a 10kv high voltage resistant analog signal isolation circuit according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a 10kv high voltage resistant analog signal isolation circuit according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a 10kv high voltage resistant analog signal isolation circuit according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a 10kv high voltage resistant analog signal isolation circuit according to an embodiment of the present application;
fig. 6 is a schematic circuit diagram of a 10kv high voltage resistant analog signal isolation circuit according to an embodiment of the present application;
fig. 7 is a schematic diagram of a part of a specific circuit of a 10kv high-voltage analog signal isolation circuit according to an embodiment of the present application;
fig. 8 is a schematic diagram of a portion of a specific circuit of a 10kv high voltage analog signal isolation circuit according to an embodiment of the present application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are for purposes of illustration and not of limitation. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings.
Furthermore, the terms "first," "second," and the like, may be used herein to describe various directions, acts, steps, or elements, etc., but these directions, acts, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first module may be referred to as a second module, and similarly, a second module may be referred to as a first module, without departing from the scope of the application. Both the first module and the second module are modules, but they are not the same module. The terms "first," "second," and the like, are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.
Example 1
As shown in fig. 1, a first embodiment of the present application provides a 10kv high withstand voltage analog signal isolation circuit, which includes a V/I conversion circuit 100, an isolation circuit 200, and a current output circuit 300.
Specifically, the V/I conversion circuit 100 includes a first input interface 101 and a first output interface 102, where the first input interface 101 is connected to an external input circuit, and the V/I conversion circuit 100 is configured to convert a first voltage signal input by the external input circuit into a first current signal; the isolation circuit 200 comprises a second input interface 201 and a second output interface 202, the second input interface 201 is connected with the first output interface 102, and the isolation circuit 200 is used for isolating the first current signal to generate a target current signal; the current output circuit 300 includes a third input interface 301 and a third output interface 302, where the third input interface 301 is connected to the second input interface 201, and the current output circuit 300 is configured to receive the target current signal and output the target current signal to an external output circuit through the third output interface 302.
In this embodiment, the V/I conversion circuit 100 can convert a voltage signal into a current signal, and the V/I conversion circuit 100 mainly includes a low input bias current amplifier, a voltage inversion charge pump and a current loop transmitter, wherein the low input bias current amplifier can be a low input bias current amplifier with the model number of AD8512, the voltage inversion charge pump can be a voltage inversion charge pump with the model number of XC6351a120MR, and the current loop transmitter can be an XTR115 current loop transmitter with the model number of XTR115 current loop transmitter, so as to achieve higher conversion accuracy. Alternatively, the V/I conversion circuit 100 may be an I/I conversion circuit or other types of conversion circuits to accommodate the needs of the user. The isolation circuit 200 adopts a 10KV (kilovolt) isolation circuit 200, and realizes isolation of 10KVAC through high-isolation withstand voltage transformer coupling, wherein the isolation circuit mainly comprises a transistor with the model of XN4601 so as to realize electrical isolation of current signals. The current output circuit 300 adopts a two-wire loop power supply loop output form, specifically adopts a two-wire loop power supply 4-20mA current loop output form design, and the current output circuit 300 is further configured to convert the target current signal into a loop current signal to supply power to the external input circuit.
Illustratively, the V/I conversion circuit 100 converts a first voltage signal input by the external input circuit into a first current signal through the first input interface 101, then sends the first current signal to the second input interface 201 of the isolation circuit 200 through the first output interface 102, and after the isolation circuit 200 isolates the first current signal to generate a target current signal, sends the target current signal to the third input interface 301 of the current output circuit 300 through the second output interface 202, and finally the current output circuit 300 outputs the target current signal to the external output circuit through the third output interface 302.
Further, referring to fig. 2-6, the analog signal isolation circuit further includes a power distribution output circuit 400, a dc conversion circuit 500, a rectifying and filtering circuit 600, a first modem circuit 700, a second modem circuit 800, a signal adding and subtracting circuit 900, and a zero gain adjustment circuit 1000.
Illustratively, as shown in fig. 2, the power distribution output circuit 400 includes a fourth input interface 401 and a fourth output interface 402, where the fourth input interface 401 is connected to the second input interface 201, and the power distribution output circuit 400 is configured to receive a loop current signal returned by the current output circuit 300 through the isolation circuit 200, and output the loop current signal to the external input circuit through the fourth output interface 402 to supply power.
The V/I conversion circuit 100 converts a first voltage signal input by the external input circuit into a first current signal through the first input interface 101, then sends the first current signal to the second input interface 201 of the isolation circuit 200 through the first output interface 102, the isolation circuit 200 isolates the first current signal to generate a target current signal, then sends the target current signal to the third input interface 301 of the current output circuit 300 through the second output interface 202, and finally the current output circuit 300 outputs the target current signal to the external output circuit through the third output interface 302, in addition, since the current output circuit 300 adopts a two-wire loop power supply 4-20mA current loop output form design, after the current output circuit 300 outputs the target current signal to the external output circuit, the current output circuit 300 is further used for converting the target current signal into a loop current signal to supply the external input circuit. Specifically, after the current output circuit 300 converts the target current signal into a loop current signal, the loop current signal is output to the second output interface 202 of the isolation circuit 200 through the third input interface 301, the isolation circuit 200 isolates the loop current signal and outputs the loop current signal to the fourth input interface 401 of the power distribution output circuit 400 through the second input interface 201, and finally the power distribution input interface outputs the loop current signal to the external input circuit through the fourth output interface 402 to supply power, so that the current output circuit 300 is used for converting the target current signal into the loop current signal to supply power to the external input circuit.
As shown in fig. 3, the dc conversion circuit 500 includes a fifth input interface 501 and a fifth output interface 502, where the fifth input interface 501 is connected to the second input interface 201, and the fifth output interface 502 is connected to the fourth input interface 401, and the dc conversion circuit 500 is configured to receive a loop current signal returned by the current output circuit 300 through the isolation circuit 200, and rectify and invert the loop current signal to send the loop current signal to the power distribution output circuit 400.
The V/I conversion circuit 100 converts a first voltage signal input by the external input circuit into a first current signal through the first input interface 101, then sends the first current signal to the second input interface 201 of the isolation circuit 200 through the first output interface 102, the isolation circuit 200 isolates the first current signal to generate a target current signal, then sends the target current signal to the third input interface 301 of the current output circuit 300 through the second output interface 202, and finally the current output circuit 300 outputs the target current signal to the external output circuit through the third output interface 302, in addition, since the current output circuit 300 adopts a two-wire loop power supply 4-20mA current loop output form design, after the current output circuit 300 outputs the target current signal to the external output circuit, the current output circuit 300 is further used for converting the target current signal into a loop current signal to supply the external input circuit. Specifically, after the current output circuit 300 converts the target current signal into a loop current signal, the loop current signal is output to the second output interface 202 of the isolation circuit 200 through the third input interface 301, the isolation circuit 200 isolates the loop current signal and outputs the loop current signal to the fifth input interface 501 of the dc conversion circuit 500 through the second input interface 201, the dc conversion circuit 500 rectifies and inverts the loop current signal and outputs the loop current signal to the fourth input interface 401 of the distribution output circuit 400 through the fifth output interface 502, and finally the distribution input interface outputs the loop current signal to the external input circuit through the fourth output interface 402 to supply power, thereby completing the use of the current output circuit 300 in converting the target current signal into the loop current signal to supply power to the external input circuit.
Illustratively, as shown in fig. 4, the rectifying and filtering circuit 600 includes a sixth input interface 601 and a sixth output interface 602, where the sixth input interface 601 is connected to the second input interface 201, and the sixth output interface 602 is connected to the fifth input interface 501, and the rectifying and filtering circuit 600 is configured to receive a loop current signal returned by the current output circuit 300 through the isolation circuit 200, and rectify and filter the loop current signal to send the loop current signal to the dc conversion circuit 500.
The V/I conversion circuit 100 converts a first voltage signal input by the external input circuit into a first current signal through the first input interface 101, then sends the first current signal to the second input interface 201 of the isolation circuit 200 through the first output interface 102, the isolation circuit 200 isolates the first current signal to generate a target current signal, then sends the target current signal to the third input interface 301 of the current output circuit 300 through the second output interface 202, and finally the current output circuit 300 outputs the target current signal to the external output circuit through the third output interface 302, in addition, since the current output circuit 300 adopts a two-wire loop power supply 4-20mA current loop output form design, after the current output circuit 300 outputs the target current signal to the external output circuit, the current output circuit 300 is further used for converting the target current signal into a loop current signal to supply the external input circuit. Specifically, the current output circuit 300 converts the target current signal into a loop current signal, the loop current signal is output to the second output interface 202 of the isolation circuit 200 through the third input interface 301, the isolation circuit 200 isolates the loop current signal and outputs the loop current signal to the sixth input interface 601 of the rectifying and filtering circuit 600 through the second input interface 201, the rectifying and filtering circuit 600 rectifies and filters the loop current signal and outputs the loop current signal to the fifth input interface 501 of the dc conversion circuit 500 through the sixth output interface 602, the dc conversion circuit 500 rectifies and inverts the loop current signal and outputs the loop current signal to the fourth input interface 401 of the distribution output circuit 400 through the fifth output interface 502, and finally the distribution input interface outputs the loop current signal to the external input circuit through the fourth output interface 402 to supply power, thereby completing the current output circuit 300 to convert the target current signal into the loop current signal and supply power to the external input circuit.
As shown in fig. 5, the first modem circuit 700 includes a seventh input interface 701 and a seventh output interface 702, where the seventh input interface 701 is connected to the first output interface 102, the seventh output interface 702 is connected to the second input interface 201, and the first modem circuit 700 is configured to modulate the target current signal. The second modem circuit 800 includes an eighth input interface 801 and an eighth output interface 802, the eighth input interface 801 is connected to the second output interface 202, the eighth output interface 802 is connected to the third input interface 301, and the second modem circuit 800 is configured to demodulate the target current signal. The first modem circuit 700 further comprises a first interface 703, the first interface 703 is connected to the sixth input interface 601, the second modem circuit 800 is further configured to modulate the loop current signal, and the first modem circuit 700 is further configured to demodulate the loop current signal.
The V/I conversion circuit 100 converts the first voltage signal input by the external input circuit into a first current signal through the first input interface 101, then sends the first current signal to the seventh input interface 701 of the first modem circuit 700 through the first output interface 102, the first modem circuit 700 modulates the first current signal, then outputs the first current signal to the second input interface 201 of the isolation circuit 200 through the seventh output interface 702, the isolation circuit 200 isolates the first current signal to generate a target current signal, then sends the target current signal to the eighth input interface 801 of the second modem circuit 800 through the second output interface 202, the second modem circuit 800 demodulates the target current signal and outputs the target current signal to the third input interface 301 of the current output circuit 300 through the eighth output interface 802, and finally the current output circuit 300 outputs the target current signal to the external output circuit through the third output interface 302, thereby completing 10KVAC high isolation tamper-proof and tamper-proof of 4-20mA current signals between the input and output of each path of signals. Further, since the current output circuit 300 is designed in a two-wire loop power supply 4-20mA current loop output form, after the current output circuit 300 outputs the target current signal to the external output circuit, the current output circuit 300 is further configured to convert the target current signal into a loop current signal to supply power to the external input circuit. Specifically, the current output circuit 300 converts the target current signal into a loop current signal, the loop current signal is output to the eighth output interface 802 of the second modem circuit 800 through the third input interface 301, the loop current signal is modulated by the second modem circuit 800 and then output to the second output interface 202 of the isolation circuit 200, the loop current signal is isolated by the isolation circuit 200 and then output to the seventh output interface 702 of the first modem circuit 700 through the second input interface 201, the loop current signal is demodulated by the first modem circuit 700 and then output to the sixth input interface 601 of the rectifying and filtering circuit 600 through the seventh input interface 701, the loop current signal is rectified and filtered by the rectifying and filtering circuit 600 and then output to the fifth input interface 501 of the direct current converting circuit 500 through the sixth output interface 602, the loop current signal is rectified and inverted by the direct current converting circuit 500 and then output to the fourth input interface 401 of the power distribution output circuit 400 through the fifth output interface 502, and finally the loop current signal is output to the external input circuit through the fourth output interface 402 so as to supply power to the external circuit 300, thereby complete the conversion of the target current signal to the external circuit.
As shown in fig. 6, the signal adding and subtracting circuit 900 includes a ninth input interface 901 and a ninth output interface 902, where the ninth input interface 901 is connected to the first output interface 102, and the ninth output interface 902 is connected to the seventh input interface 701, and the signal adding and subtracting circuit 900 is configured to add and subtract the first current signal. The signal adding and subtracting circuit 900 further includes a second interface 903, the dc conversion circuit 500 further includes a third interface 503, and the dc conversion circuit 500 is further configured to provide an operating voltage to the signal adding and subtracting circuit 900. The zero gain adjustment circuit 1000 includes a fifth interface 1001, the signal adding and subtracting circuit 900 further includes a fourth interface 904, the fourth interface 904 is connected to the fifth interface 1001, and the zero gain adjustment circuit 1000 is configured to calibrate zero and full values of the first current signal.
The V/I conversion circuit 100 converts a first voltage signal input by the external input circuit into a first current signal through the first input interface 101, then sends the first current signal to the ninth input interface 901 of the signal add-subtract circuit 900 through the first output interface 102, then the signal add-subtract circuit 900 performs add-subtract processing on the first current signal, further, the zero gain adjustment circuit 1000 may be further connected with the fourth interface 904 of the signal add-subtract circuit 900 through the fifth interface 1001 to calibrate zero and full-scale values of the first current signal, the first current signal after the add-subtract processing is output to the seventh input interface 701 of the first modulation-demodulation circuit 700 through the ninth output interface 902, the first modulation-demodulation circuit 700 modulates the first current signal, then the first current signal is output to the second input interface 201 of the isolation circuit 200 through the seventh output interface 702, the isolation circuit 200 isolates the first current signal to generate a target current signal, then sends the target current signal to the eighth input interface 801 of the second modulation-demodulation circuit 900 through the second output interface 202, the second modulation-demodulation circuit 800 performs interference-free current signal to the target current signal from the eighth input interface 300 through the eighth output interface 301, and the first output interface 300 is output to the third input interface 20, and the tamper-proof signal is output between the first input interface 300 and the tamper-proof circuit is output to the external ac signal is completed.
Further, since the current output circuit 300 is designed in a two-wire loop power supply 4-20mA current loop output form, after the current output circuit 300 outputs the target current signal to the external output circuit, the current output circuit 300 is further configured to convert the target current signal into a loop current signal to supply power to the external input circuit. Specifically, the current output circuit 300 converts the target current signal into a loop current signal, the loop current signal is output to the eighth output interface 802 of the second modem circuit 800 through the third input interface 301, the loop current signal is modulated by the second modem circuit 800 and then output to the second output interface 202 of the isolation circuit 200, the loop current signal is isolated by the isolation circuit 200 and then output to the seventh output interface 702 of the first modem circuit 700 through the second input interface 201, the loop current signal is demodulated by the first modem circuit 700 and then output to the sixth input interface 601 of the rectifying and filtering circuit 600 through the seventh input interface 701, the loop current signal is rectified and filtered by the rectifying and filtering circuit 600 and then output to the fifth input interface 501 of the direct current converting circuit 500 through the sixth output interface 602, the loop current signal is rectified and inverted by the direct current converting circuit 500 and then output to the fourth input interface 401 of the power distribution output circuit 400 through the fifth output interface 502, and finally the loop current signal is output to the external input circuit through the fourth output interface 402 so as to supply power to the external circuit 300, thereby complete the conversion of the target current signal to the external circuit. In addition, the signal add-drop circuit 900 further includes a second interface 903, the dc conversion circuit 500 further includes a third interface 503, and the dc conversion circuit 500 is further configured to output the loop current signal to the second interface 903 of the signal add-drop circuit 900 through the third interface 503 after receiving the loop current signal, so as to provide an operating voltage to the signal add-drop circuit 900.
In this embodiment, the add-subtract circuit can also process the zero offset and the bidirectional signal of the input belt, so as to meet the signal conversion requirements of various sensors and transmitters, and realize miniaturization of products, the whole circuit adopts the SIP16Pin flame-retardant IC package to form products, and users can realize voltage signal distribution in the sensor and bridge (weighing) detection circuit, such as electronic ruler, displacement, potentiometer and the like, which need to be provided with a small number of peripheral devices, only by adding a small number of peripheral devices to the input end of the products. The specific circuit in the analog signal isolation circuit provided in the embodiment of the present application may be shown in fig. 7 and fig. 8, where fig. 7 is a circuit of the whole circuit before isolation transmission, and an I/V conversion circuit 1100 may be further disposed before the power distribution output circuit 400, for converting a current signal into a voltage signal and outputting the voltage signal, and the rectifying and filtering circuit 600 plays a role of the first modem circuit 700, and fig. 8 is a circuit of the whole circuit after isolation transmission.
Note that the above is only a preferred embodiment of the present application and the technical principle applied. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, while the application has been described in connection with the above embodiments, the application is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the application, the scope of which is determined by the scope of the appended claims.
Claims (8)
1. A 10kv high withstand voltage analog signal isolation circuit, comprising:
the V/I conversion circuit comprises a first input interface and a first output interface, wherein the first input interface is connected to an external input circuit, and the V/I conversion circuit is used for converting a first voltage signal input by the external input circuit into a first current signal;
the isolation circuit comprises a second input interface and a second output interface, the second input interface is connected with the first output interface, and the isolation circuit is used for isolating the first current signal to generate a target current signal;
the current output circuit comprises a third input interface and a third output interface, the third input interface is connected with the second input interface, and the current output circuit is used for receiving the target current signal and outputting the target current signal to an external output circuit through the third output interface;
the current output circuit adopts a two-wire loop power supply loop output form, and is also used for converting the target current signal into a loop current signal so as to supply power for the external input circuit;
further comprises:
the power distribution output circuit comprises a fourth input interface and a fourth output interface, the fourth input interface is connected with the second input interface, and the power distribution output circuit is used for receiving a loop current signal returned by the current output circuit through the isolation circuit and outputting the loop current signal to the external input circuit through the fourth output interface so as to supply power.
2. The analog signal isolation circuit of claim 1, further comprising:
the direct current conversion circuit is connected with the power distribution output circuit and the isolation circuit, and is used for receiving a loop current signal returned by the current output circuit through the isolation circuit, rectifying and inverting the loop current signal and sending the loop current signal to the power distribution output circuit.
3. The analog signal isolation circuit of claim 2, further comprising:
the rectification filter circuit is connected between the direct current conversion circuit and the isolation circuit, and is used for receiving a loop current signal returned by the current output circuit through the isolation circuit, rectifying and filtering the loop current signal and sending the loop current signal to the direct current conversion circuit.
4. The analog signal isolation circuit of claim 3, further comprising:
the first modulation and demodulation circuit is connected between the V/I conversion circuit and the isolation circuit and is used for modulating the target current signal;
the second modem circuit comprises an eighth input interface and an eighth output interface, the eighth input interface is connected with the second output interface, the eighth output interface is connected with the third input interface, and the second modem circuit is used for demodulating the target current signal.
5. The analog signal isolation circuit of claim 4, wherein said first modem circuit further comprises a first interface, said second modem circuit further for modulating said loop current signal, said first modem circuit further for demodulating said loop current signal.
6. The analog signal isolation circuit of claim 4, further comprising:
and the signal adding and subtracting circuit is connected between the V/I conversion circuit and the first modulation and demodulation circuit and is used for adding and subtracting the first current signal.
7. The analog signal isolation circuit of claim 6, wherein said signal adding and subtracting circuit further comprises a second interface, said dc conversion circuit further comprises a third interface, said dc conversion circuit further configured to provide an operating voltage to said signal adding and subtracting circuit.
8. The analog signal isolation circuit of claim 6, further comprising:
the zero gain adjusting circuit comprises a fifth interface, the signal adding and subtracting circuit further comprises a fourth interface, the fourth interface is connected with the fifth interface, and the zero gain adjusting circuit is used for calibrating zero and full-scale values of the first current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010300993.XA CN111464175B (en) | 2020-04-16 | 2020-04-16 | 10-kilovolt high-voltage-resistant analog signal isolation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010300993.XA CN111464175B (en) | 2020-04-16 | 2020-04-16 | 10-kilovolt high-voltage-resistant analog signal isolation circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134155Y (en) * | 2007-12-25 | 2008-10-15 | 上海辰竹仪表有限公司 | Signal separating and converting circuit |
| CN203027137U (en) * | 2012-12-26 | 2013-06-26 | 于广沅 | Module for isolated conversion from one path of input into two paths of electric signal outputs |
| CN204886921U (en) * | 2015-09-14 | 2015-12-16 | 于广沅 | Active type analog signal keeps apart converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20060290425A1 (en) * | 2005-06-23 | 2006-12-28 | Delta Electronics, Inc. | Isolated conversion apparatus for analog signal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201134155Y (en) * | 2007-12-25 | 2008-10-15 | 上海辰竹仪表有限公司 | Signal separating and converting circuit |
| CN203027137U (en) * | 2012-12-26 | 2013-06-26 | 于广沅 | Module for isolated conversion from one path of input into two paths of electric signal outputs |
| CN204886921U (en) * | 2015-09-14 | 2015-12-16 | 于广沅 | Active type analog signal keeps apart converter |
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