Novel high-precision current-to-voltage signal isolation system

Abstract

The utility model relates to a novel high-precision current-to-voltage signal isolation system in the field of current-to-voltage. The novel high-precision current-to-voltage signal isolation system comprises an input circuit, an output circuit, a power supply chip circuit, an alternating power supply generation circuit, a series adjustment type voltage stabilizing circuit, a transformer and an isolation power supply circuit, the transformer comprises a T5 transformer and a T6 transformer; the input circuit is connected with the output circuit through a T5 transformer, the output circuit is connected with the power supply chip circuit through a T6 transformer, the power supply chip circuit is connected with the alternating power supply circuit, the alternating power supply circuit is connected with the series adjustment type voltage stabilizing circuit, and the alternating power supply circuit is connected with the isolation power supply circuit. According to the utility model, the input range is wide, the output is flexible and adjustable, the structure is simple, the cost is low, the output precision is high, the isolation between the input and output and the power supply is high, the function is not single, the function of outputting 24V voltage is added, the output of voltages in different ranges can be realized, and the purpose of controlling the output is achieved.

Description

Technical Field

[0001] The utility model relates to the field of current-to-voltage conversion, and particularly to a novel high-precision current-to-voltage signal isolation system. Background Art

[0002] In the application of modern electronic devices, the current-to-voltage isolation technology is a widely used technology, which is applied to devices that need to convert current signals into voltage signals, thus achieving electrical isolation between the signal acquisition sensor and the host computer.

[0003] In some specific application scenarios, it is necessary to transmit signals from one device to another. Since the signal natures between the devices are different, it is necessary to convert the current signal into a voltage signal and maintain electrical isolation between the input end and the output end to prevent the occurrence of some electrical interference and safety risks. Therefore, a device is needed to convert the current signal into a voltage signal and achieve isolation among the input, output, and power supply terminals, effectively ensuring the stability and reliability of signal transmission.

[0004] In today's industrial environment, with the development of industry, although the isolation technology of converting current signals into voltage signals has been widely applied in electronic circuit design, there are still some technical deficiencies and drawbacks:

[0005] 1. The input signal range is small and the output signal is not flexible;

[0006] 2. The accuracy is insufficient and there is a large error from the ideal value;

[0007] 3. The isolation degree between the input, output, and power supply is insufficient;

[0008] 4. The function is single;

[0009] 5. Problems such as high manufacturing cost, etc. Content of the Utility Model

[0010] The purpose of the utility model is to propose a novel high-precision current-to-voltage signal isolation system for the above problems.

[0011] A novel high-precision current-to-voltage signal isolation system includes an input circuit, an output circuit, a power chip circuit, an alternating power generation circuit, a series-regulated voltage-stabilizing circuit, a transformer, and an isolated power supply circuit;

[0012] The transformer includes a T5 transformer and a T6 transformer;

[0013] The input circuit is connected to the output circuit through a T5 transformer, the output circuit is connected to the power supply chip circuit through a T6 transformer, the power supply chip circuit is connected to generate an alternating power circuit, the alternating power circuit is connected to a series-regulated voltage-stabilizing circuit, and the alternating power circuit is connected to an isolated power circuit.

[0014] Furthermore, a novel high-precision current-to-voltage signal isolation system, wherein the input circuit includes an R71 resistor, an R78 resistor, a U14 operational amplifier, a U16 operational amplifier, an R76 resistor, an R75 resistor, an R80 resistor, an R66 resistor, a Q16 MOS transistor circuit, a Q12 MOS transistor circuit, and a T5 transformer;

[0015] The R71 resistor and the R78 resistor are in parallel, and the parallel-connected R71 resistor and R78 resistor are connected to the non-inverting input terminal pin 3 of the U14 operational amplifier;

[0016] The U16 operational amplifier is connected to the inverting input terminal pin 2 of the U14 operational amplifier through an R76 resistor, an R75 resistor, an R80 resistor, and an R66 resistor;

[0017] The output terminal pin 6 of the U14 operational amplifier is connected to pin 7 and pin 5 of the T5 transformer;

[0018] The Q16 MOS transistor circuit is connected to pin 8 of the T5 transformer, and the Q12 MOS transistor circuit is connected to pin 6 of the T5 transformer.

[0019] Furthermore, a novel high-precision current-to-voltage signal isolation system, wherein the output circuit includes an R208 potentiometer, a U29B operational amplifier, a U31 operational amplifier, an R214 resistor, an R203 potentiometer, a U29A operational amplifier, an R218 resistor, a D29 diode, a C167 capacitor, and a C168 capacitor;

[0020] Pin 2 and pin 4 of the T5 transformer are connected to pin 3 of the R208 potentiometer, and pin 2 of the R208 potentiometer is connected to pin 5 of the U29B operational amplifier;

[0021] The U31 operational amplifier is connected to pin 1 of the R203 potentiometer through an R214 resistor, and pin 2 of the R203 potentiometer is connected to pin 3 of the U29A operational amplifier;

[0022] Pin 2 and pin 4 of the T6 transformer are connected to the D29 diode and the C167 capacitor, and the C168 capacitor.

[0023] Furthermore, a novel high-precision current-to-voltage signal isolation system, wherein the power supply chip circuit includes a U57 power supply chip;

[0024] Pin 2 and pin 4 of the T6 transformer are connected to pin 1 of the U57 power supply chip.

[0025] Furthermore, a novel high-precision current-to-voltage signal isolation system, the alternating power supply generation circuit of which includes a U3 micro-power isolation power supply chip;

[0026] The U57 power supply chip is connected to pin 5 of the U3 micro-power isolation power supply chip, and pin 4 and pin 6 of the U3 micro-power isolation power supply chip are connected to pin 1 and pin 3 of the T6 transformer.

[0027] Furthermore, a novel high-precision current-to-voltage signal isolation system, the series-regulated voltage stabilizer circuit of which includes a Q60 triode, a Q13 triode, a Q14 voltage reference chip, a D11 diode, a C72 capacitor, a C69 capacitor, a D9 diode, a C70 capacitor, and a C71 capacitor;

[0028] The Q60 triode, the Q13 triode, and the Q14 voltage reference chip are connected in series;

[0029] The Q60 triode, the Q13 triode, and the Q14 voltage reference chip are connected to the D11 diode, the C72 capacitor, and the C69 capacitor through pin 8 and pin 7 of the T6 transformer;

[0030] Pin 6 and pin 5 of the T6 transformer are connected to the D9 diode, the C70 capacitor, and the C71 capacitor.

[0031] Furthermore, a novel high-precision current-to-voltage signal isolation system, the isolation power supply circuit of which includes a U41 isolation power supply;

[0032] The U3 micro-power isolation power supply chip is connected to pin 2 of the U41 isolation power supply, and pin 4 of the U41 isolation power supply is connected to an external component.

[0033] The beneficial effects of the present utility model: A novel high-precision current-to-voltage signal isolation system has a wide input range, flexible output adjustment, simple structure, low cost, high output precision, high isolation degree between input, output and power supply, not a single function, adds the function of outputting 24V voltage externally, and can achieve outputting voltages in different ranges to achieve the purpose of controlling the output. Description of the Drawings

[0034] Figure 1 It is the input circuit diagram.

[0035] Figure 2 It is the output circuit diagram.

[0036] Figure 3 It is the power supply chip circuit diagram.

[0037] Figure 4 For generating an alternating power supply circuit diagram.

[0038] Figure 5 For a series-regulated voltage-stabilizing circuit diagram.

[0039] Figure 6 For an isolated power supply circuit diagram. Specific implementation manners

[0040] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific implementation manners of the present utility model will now be described with reference to the accompanying drawings.

[0041] In this embodiment, as shown in the attached Figure 1 figures, a novel high-precision current-to-voltage signal isolation system includes an input circuit, an output circuit, a power supply chip circuit, a circuit for generating an alternating power supply, a series-regulated voltage-stabilizing circuit, a transformer, and an isolated power supply circuit;

[0042] The transformer includes a T5 transformer and a T6 transformer;

[0043] The input circuit is connected to the output circuit through the T5 transformer, the output circuit is connected to the power supply chip circuit through the T6 transformer, the power supply chip circuit is connected to the circuit for generating an alternating power supply, the alternating power supply circuit is connected to the series-regulated voltage-stabilizing circuit, and the alternating power supply circuit is connected to the isolated power supply circuit.

[0044] The input circuit includes an operational amplifier, a reference voltage chip, etc., for amplifying and filtering the input current signal;

[0045] The output circuit includes an operational amplifier, a reference voltage chip, a potentiometer, etc., for further processing of signal amplification, filtering, and fine-tuning to obtain the output voltage signal;

[0046] The circuit for generating an alternating power supply provides a stable operating voltage for the chip to prevent ripple effects on the output;

[0047] The isolated power supply circuit realizes the isolation output of the 24V power input to 24V voltage.

[0048] Furthermore, for a novel high-precision current-to-voltage signal isolation system, the input circuit includes an R71 resistor, an R78 resistor, a U14 operational amplifier, a U16 operational amplifier, an R76 resistor, an R75 resistor, an R80 resistor, an R66 resistor, a Q16 MOS transistor circuit, a Q12 MOS transistor circuit, and a T5 transformer;

[0049] The R71 resistor and the R78 resistor are in parallel, and the parallel-connected R71 resistor and R78 resistor are connected to the non-inverting input terminal pin 3 of the U14 operational amplifier;

[0050] The U16 operational amplifier is connected to the inverting input terminal pin 2 of the U14 operational amplifier through the R76 resistor, R75 resistor, R80 resistor, and R66 resistor;

[0051] The output terminal pin 6 of the U14 operational amplifier is connected to pin 7 and pin 5 of the T5 transformer;

[0052] The Q16 MOS transistor circuit is connected to pin 8 of the T5 transformer, and the Q12 MOS transistor circuit is connected to pin 6 of the T5 transformer.

[0053] The principle is as follows: The current inputs IN+ and IN- pass through two parallel 100-ohm resistors, R71 and R78, and are converted into voltage signals that are input to the non-inverting input terminal pin 3 of the U14 operational amplifier. For example, 4 mA is 0.2 V, 10 mA is 0.5 V, and 20 mA is 1 V;

[0054] The precise voltage of 2.5 V generated by the U16 operational amplifier is connected to the inverting input terminal pin 2 of the U14 operational amplifier of the operational amplifier through the R76 resistor, R75 resistor, R80 resistor, and R66 resistor, and then amplified by 0.57 V, 1.046 V, and 1.84 V by the operational amplifier and filtered to pin 7 and pin 5 of the 5 transformer. Two symmetric Q16 MOS transistor circuits and Q12 MOS transistor circuits are connected to pin 8 and pin 6 of the 5 transformer to increase the driving ability and couple the alternating current.

[0055] As shown in the appendix Figure 2 As shown, a new type of high-precision current-to-voltage signal isolation system, the output circuit includes an R208 potentiometer, a U29B operational amplifier, a U31 operational amplifier, an R214 resistor, an R203 potentiometer, a U29A operational amplifier, an R218 resistor, a D29 diode, a C167 capacitor, and a C168 capacitor;

[0056] Pin 2 and pin 4 of the T5 transformer are connected to pin 3 of the R208 potentiometer, and pin 2 of the R208 potentiometer is connected to pin 5 of the U29B operational amplifier;

[0057] The U31 operational amplifier is connected to pin 1 of the R203 potentiometer through the R214 resistor, and pin 2 of the R203 potentiometer is connected to pin 3 of the U29A operational amplifier;

[0058] Pin 2 and pin 4 of the T6 transformer are connected to the D29 diode and the C167 capacitor and C168 capacitor.

[0059] The principle is as follows: The signal outputs sigP3 and sigN3 from pins 2 and 4 of the T5 transformer, connects to pin 3 of the R208 potentiometer, and then outputs from pin 2 of the R208 potentiometer to pin 5 of the U29B operational amplifier. The precise voltage of 2.5V generated by the U31 operational amplifier is connected to pin 1 of the R203 potentiometer through the R214 resistor;

[0060] Then it connects from pin 2 of the R203 potentiometer to pin 3 of the U29A operational amplifier. The voltage follower output passes through the R218 resistor to pin 6 of the U29B operational amplifier, and finally outputs amplified through pin 7 of the U29B operational amplifier;

[0061] The R208 potentiometer and the R203 potentiometer play the role of fine-tuning the voltage. The part that outputs PowinP3 and GND_SIGNAL3 from pins 2 and 4 of the T6 transformer in the middle is the power supply part, which converts alternating current into direct current voltage to supply power to the chip. The D29 diode and the C167 capacitor and C168 capacitor rectify it into +14V and -12V direct current voltages to supply power to the chip +VS and -VS;

[0062] The output of the voltage signal amplified by the exception operational amplifier can be used to control the output of different voltage signals by changing the resistance values of the surrounding R218 resistor, R196 resistor, R217 resistor, and R223 resistor. For example, for a 4 - 20mA current signal input, different voltage signals such as 1 - 5V, 0 - 5V, 0 - 10V, etc. can be output.

[0063] As shown in the Figure 3 attachment, a new type of high-precision current-to-voltage signal isolation system, the power supply chip circuit includes a U57 power supply chip;

[0064] Pins 2 and 4 of the T6 transformer are connected to pin 1 of the U57 power supply chip.

[0065] The principle is as follows: Input the +24V power supply to pin 1 of the U57 power supply chip, and the output of the U57 power supply chip is +12V voltage, which is used as the input voltage of the subsequent alternating power supply generation circuit.

[0066] As shown in the Figure 4 attachment, a new type of high-precision current-to-voltage signal isolation system, the alternating power supply generation circuit includes a U3 micro-power isolation power supply chip;

[0067] The U57 power supply chip is connected to pin 5 of the U3 micro-power isolation power supply chip. Pins 4 and 6 of the U3 micro-power isolation power supply chip are connected to pins 1 and 3 of the T6 transformer.

[0068] The principle is as follows: The +12V voltage is connected to pin 5 of the U3 micropower isolated power supply chip. After passing through the U3 micropower isolated power supply chip to generate an alternating voltage, it is output as PowoutN3 and PowoutP3 through pin 4 and pin 6 of the U3 micropower isolated power supply chip to pin 1 and pin 3 of the T6 transformer, achieving the purpose of generating an alternating voltage to supply power to the input circuit and the output circuit.

[0069] As shown in the Figure 5 accompanying figure, a new type of high-precision current-to-voltage signal isolation system, the series-regulated voltage-stabilizing circuit includes the Q60 triode, Q13 triode, Q14 voltage reference chip, D11 diode, C72 capacitor, C69 capacitor, D9 diode, C70 capacitor, and C71 capacitor;

[0070] The Q60 triode, Q13 triode, and Q14 voltage reference chip are connected in series;

[0071] The Q60 triode, Q13 triode, and Q14 voltage reference chip are connected to the D11 diode, C72 capacitor, and C69 capacitor through pin 8 and pin 7 of the T6 transformer;

[0072] Pin 6 and pin 5 of the T6 transformer are connected to the D9 diode, C70 capacitor, and C71 capacitor.

[0073] The principle is as follows: Providing a stable and precise DC voltage as the working voltage of the U3 micropower isolated power supply chip can make the signal adjustment circuit more accurate and stable. It consists of two Q60 triodes, Q13 triodes, Q14 voltage reference chips, etc. The Q60 triode and Q13 triode serve as the drive tube and the adjustment tube, and the Q14 voltage reference chip part serves as the sampling circuit;

[0074] It is output to the D11 diode, C72 capacitor, and C69 capacitor through pin 8 and pin 7 of the T6 transformer to become a DC voltage, and then output to the series-regulated voltage-stabilizing circuit. The magnitude of the DC working voltage Uo output by the series-regulated voltage-stabilizing circuit can be continuously fine-tuned, that is, the magnitude of the DC output voltage is adjusted within a certain range. The calculation formula is:

[0075] Uo = Vref * (1 + R47 / (R48 + R54));

[0076] Pin 6 and pin 5 of the T6 transformer are connected to the D9 diode, C70 capacitor, and C71 capacitor, and are rectified to form the working voltages +VCC and -VCC of +14V and -12V to supply power to the U3 micropower isolated power supply chip.

[0077] As shown in the Figure 6As shown, a new type of high-precision current-to-voltage signal isolation system, the isolation power supply circuit includes U41 isolation power supply;

[0078] The U3 micropower isolation power supply chip is connected to pin 2 of the U41 isolation power supply, and pin 4 of the U41 isolation power supply is connected to an external component.

[0079] The principle is as follows: The +24V power supply is input into pin 2 of the U41 isolation power supply, and the isolated +24V voltage ISO_24V is output through pin 4 of the U41 isolation power supply, realizing the function of providing an external isolated output of +24V;

[0080] For example, a 4-20mA current input can obtain isolated outputs with different voltage ranges such as 1-5V, 0-5V, 0-10V, etc., with fast response and high precision. Each channel can independently output an isolated voltage of 24V, meeting the requirements of current-to-voltage signal conversion.

[0081] The utility model designs a new type of high-precision current-to-voltage signal isolation system, which has a wide input range, flexible output adjustment, simple structure, low cost, high output precision, high isolation degree between input, output and power supply, and multiple functions. It adds the function of externally outputting a 24V voltage and can achieve output voltages in different ranges to achieve the purpose of controlling the output.

[0082] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection claimed by the utility model is defined by the appended claims and their equivalents.

Claims

1. A novel high-precision system for isolating current-to-voltage signals, characterized in that, It includes an input circuit, an output circuit, a power supply chip circuit, an alternating power generation circuit, a series regulated power supply circuit, a transformer, and an isolated power supply circuit; The transformer includes a T5 transformer and a T6 transformer; The input circuit is connected to the output circuit through the T5 transformer, the output circuit is connected to the power supply chip circuit through the T6 transformer, the power supply chip circuit is connected to the alternating power generation circuit, the alternating power generation circuit is connected to the series regulated power supply circuit, and the alternating power generation circuit is connected to the isolated power supply circuit.

2. A novel high-precision current-to-voltage signal isolation system according to claim 1, characterized in that, The input circuit includes an R71 resistor, an R78 resistor, a U14 operational amplifier, a U16 operational amplifier, an R76 resistor, an R75 resistor, an R80 resistor, an R66 resistor, a Q16 MOS transistor circuit, a Q12 MOS transistor circuit, and a T5 transformer; The R71 resistor and the R78 resistor are in parallel, and the parallel R71 resistor and R78 resistor are connected to the non-inverting input terminal pin 3 of the U14 operational amplifier; The U16 operational amplifier is connected to the inverting input terminal pin 2 of the U14 operational amplifier through the R76 resistor, the R75 resistor, the R80 resistor, and the R66 resistor; The output terminal pin 6 of the U14 operational amplifier is connected to pin 7 and pin 5 of the T5 transformer; The Q16 MOS transistor circuit is connected to pin 8 of the T5 transformer, and the Q12 MOS transistor circuit is connected to pin 6 of the T5 transformer.

3. A novel high-precision current-to-voltage signal isolation system according to claim 1, characterized in that, The output circuit includes an R208 potentiometer, a U29B operational amplifier, a U31 operational amplifier, an R214 resistor, a R203 potentiometer, a U29A operational amplifier, an R218 resistor, a D29 diode, a C167 capacitor, and a C168 capacitor; Pin 2 and pin 4 of the T5 transformer are connected to pin 3 of the R208 potentiometer, and pin 2 of the R208 potentiometer is connected to pin 5 of the U29B operational amplifier; The U31 operational amplifier is connected to pin 1 of the R203 potentiometer through the R214 resistor, and pin 2 of the R203 potentiometer is connected to pin 3 of the U29A operational amplifier; Pin 2 and pin 4 of the T6 transformer are connected to the D29 diode, the C167 capacitor, and the C168 capacitor.

4. A novel high-precision current-to-voltage signal isolation system according to claim 1, characterized in that, The power supply chip circuit includes a U57 power supply chip; Pin 2 and pin 4 of the T6 transformer are connected to pin 1 of the U57 power supply chip.

5. A novel high-precision current-to-voltage signal isolation system as claimed in claim 4, characterized in that, The alternating power generation circuit includes a U3 micropower isolated power supply chip; The U57 power supply chip is connected to pin 5 of the U3 micropower isolated power supply chip, and pin 4 and pin 6 of the U3 micropower isolated power supply chip are connected to pin 1 and pin 3 of the T6 transformer.

6. A novel high-precision current-to-voltage signal isolation system according to claim 1, characterized in that, The series regulated power supply circuit includes a Q60 triode, a Q13 triode, a Q14 voltage reference chip, a D11 diode, a C72 capacitor, a C69 capacitor, a D9 diode, a C70 capacitor, and a C71 capacitor; The Q60 triode, the Q13 triode, and the Q14 voltage reference chip are connected in series; The Q60 triode, the Q13 triode, and the Q14 voltage reference chip are connected to the D11 diode, the C72 capacitor, and the C69 capacitor through pin 8 and pin 7 of the T6 transformer; Pin 6 and pin 5 of the T6 transformer are connected to the D9 diode, the C70 capacitor, and the C71 capacitor.

7. A novel high-precision current-to-voltage signal isolation system according to claim 5, characterized in that, The isolated power supply circuit includes the U41 isolated power supply; The U3 micropower isolated power supply chip is connected to pin 2 of the U41 isolated power supply, and pin 4 of the U41 isolated power supply is connected to an external component.

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