CN214755476U - Circuit of microcomputer protection device - Google Patents
Circuit of microcomputer protection device Download PDFInfo
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- CN214755476U CN214755476U CN202022940393.8U CN202022940393U CN214755476U CN 214755476 U CN214755476 U CN 214755476U CN 202022940393 U CN202022940393 U CN 202022940393U CN 214755476 U CN214755476 U CN 214755476U
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Abstract
The utility model provides a circuit of a microcomputer protection device, which comprises an operational amplifier UID, an operational amplifier UIA and a high-precision sampling resistor R, the UID comprises an input resistor RI and a capacitor C1, wherein the inverting input end of the UID is connected to an input end IN through the input resistor RI, the non-inverting input end of the UID is grounded, a pin 4 is connected with a +15v power supply, a pin 11 is connected with a-15 v power supply, the UID output end is connected with the non-inverting input end of the UID through a capacitor C1, the UID output end is connected with an output end OUT through a high-precision sampling resistor R, the non-inverting input end of the UIA is connected with the output end of the UID through a resistor R1 and is grounded through a resistor R2, the inverting input end is connected with the output end OUT through a resistor R3 and is connected with the inverting input end of the UID through a resistor R4 and a feedback resistor RF, the output end of the UIA is connected with the inverting input end of the UID through a feedback resistor RF, the pin 4 of the UIA is connected with the +15v power supply, and the pin 11 is connected with the-15 v power supply. The utility model discloses overcome two problems of error are introduced to big and high-accuracy sampling resistor temperature drift of traditional transistor output circuit temperature drift simultaneously, have restrained the influence of common mode interference to conversion accuracy and linearity.
Description
Technical Field
The utility model relates to an electric power protection application especially relates to a circuit for computer protection device.
Background
With the development of electric power systems and the progress of microelectronic technology in China, microcomputer protection is more and more widely applied, most of the existing microcomputer protection devices adopt a DSP or an MCU as a main processor, AD is adopted for data sampling, and then the calculation of a measured value is carried out through an algorithm, the algorithm is generally simpler, the calculation precision is lower, and the required precision, linearity and stability are higher for key links of acquisition and transmission, so that a circuit suitable for microcomputer protection is developed to improve the working performance index of the microcomputer protection device, and the microcomputer protection device plays an important role in improving the protection precision of a power supply system.
Disclosure of Invention
The utility model provides a technical problem: the utility model provides a precision, linearity and the lower problem of stability when the key link of collection, transmission is handled to original computer protection device.
The utility model adopts the technical proposal that: the utility model provides a circuit of computer protection device, including operational amplifier UID, operational amplifier UIA, high-accuracy sampling resistance R, input resistance RI, electric capacity C1, the inverting input end of operational amplifier UID connects to input IN through input resistance RI, the noninverting input end ground connection of operational amplifier UID, pin 4 connects +15v power, and pin 11 connects-15 v power, the output of operational amplifier UID passes through electric capacity C1 with its noninverting input end and is connected, the output of operational amplifier UID is connected to output OUT through high-accuracy sampling resistance R, the noninverting input end of operational amplifier UIA is connected to the output of operational amplifier UID through resistance R1, again through resistance R2 ground connection, the inverting input end of operational amplifier UIA is connected to output OUT through resistance R3, again through resistance R4 and feedback resistance RF with the inverting input end of operational amplifier UID is connected, the output end of the operational amplifier UIA is connected with the inverting input end of the operational amplifier UID through a feedback resistor RF, a pin 4 of the operational amplifier UIA is connected with a +15v power supply, and a pin 11 is connected with a-15 v power supply.
Further, the resistance value of the high-precision sampling resistor is 100 omega.
The utility model discloses the technological effect who gains: the utility model discloses used the current output circuit who does not have the transistor, overcome the tradition and had the big problem of transistor output circuit temperature drift, used differential sampling structure in the sample return circuit, restrained common mode interference to the influence of conversion accuracy and linearity, overcome the error that high accuracy sampling resistance R temperature drift introduced, had excellent constant current characteristic in the rated load within range, its degree of accuracy, linearity are up to 0.05% level.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
As shown IN fig. 1, a circuit of a microcomputer protection device, the utility model provides a circuit of a microcomputer protection device, including operational amplifier UID, operational amplifier UIA, high-precision sampling resistor R, input resistor RI, electric capacity C1, the inverting input end of operational amplifier UID connects to input IN through input resistor RI, the non inverting input end of operational amplifier UID is grounded, pin 4 connects +15v power, pin 11 connects-15 v power, the output end of operational amplifier UID connects through electric capacity C1 with its non inverting input end, the output end of operational amplifier UID connects to output OUT through sampling resistor R, the non inverting input end of operational amplifier UIA connects to the output end of operational amplifier UID through resistor R1, again through resistance R2 ground, the inverting input end of operational amplifier UIA connects to output OUT through resistor R3, the power supply is also connected with the inverting input end of the operational amplifier UID through a resistor R4 and a feedback resistor RF, the output end of the operational amplifier UIA is connected with the inverting input end of the operational amplifier UID through the feedback resistor RF, a pin 4 of the operational amplifier UIA is connected with a +15v power supply, and a pin 11 is connected with a-15 v power supply.
The working process of the embodiment: the voltage signal is connected to the inverting input end of the operational amplifier UID through the input resistor RI, the output end of the operational amplifier UID is output after passing through the high-precision sampling resistor R, the high-precision sampling resistor is 100 omega in the whole loop, a transistor-free current output circuit is used for ensuring temperature stability, so that temperature drift of a current output stage caused by a load is compensated by a feedback loop in the amplifier, and the problem of large temperature drift of the traditional transistor output circuit is solved.
The output end of the operational amplifier UID is connected with the non-inverting input end of the operational amplifier UIA through a resistor R1, the operational amplifier UIA only amplifies differential mode signals (voltage difference between two ends of a high-precision sampling resistor R), common mode interference signals cannot be amplified, the influence of common mode interference on conversion precision and linearity is effectively inhibited, meanwhile, differential sampling also has the characteristic of overcoming temperature drift, and errors caused by temperature drift of the high-precision sampling resistor R can be overcome.
The output end of the operational amplifier UIA is sent to the inverting input end of the operational amplifier UID after passing through the feedback resistor RF to form a negative feedback loop, so that the whole circuit realizes a constant current output function, the gain of the whole loop is-1, when the input end IN is-2V, the output end OUT outputs 20mA current, the input and the output are IN linear proportion, a 500 ohm load can be driven to the maximum, the constant current circuit has excellent constant current characteristics within a rated load range, and the accuracy and the linearity of the constant current circuit are up to 0.05 percent.
The utility model discloses can improve the working property index of microcomputer protection device current output level, make the protection precision, performance index such as linearity, temperature stability obtain great promotion.
Claims (2)
1. A circuit of a microcomputer protection device is characterized by comprising an operational amplifier UID, an operational amplifier UIA, a high-precision sampling resistor R, an input resistor RI and a capacitor C1,
the inverting input of the operational amplifier UID is connected to the input IN via an input resistor RI,
the non-inverting input end of the operational amplifier UID is grounded, a pin 4 is connected with a +15v power supply, a pin 11 is connected with a-15 v power supply,
the output end of the operational amplifier UID is connected with the inverting input end thereof through a capacitor C1, the output end of the operational amplifier UID is connected with the output end OUT through a high-precision sampling resistor R,
the non-inverting input terminal of the operational amplifier UIA is connected to the output terminal of the operational amplifier UID through a resistor R1, and is grounded through a resistor R2,
the inverting input terminal of the operational amplifier UIA is connected to the output terminal OUT through a resistor R3 and is connected to the inverting input terminal of the operational amplifier UIA through a resistor R4 and a feedback resistor RF,
the output end of the operational amplifier UIA is connected with the inverting input end of the operational amplifier UID through a feedback resistor RF, a pin 4 of the operational amplifier UIA is connected with a +15v power supply, and a pin 11 is connected with a-15 v power supply.
2. The microcomputer protection device circuit according to claim 1, wherein the high precision sampling resistor has a Rresistance of 100 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022940393.8U CN214755476U (en) | 2020-12-11 | 2020-12-11 | Circuit of microcomputer protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022940393.8U CN214755476U (en) | 2020-12-11 | 2020-12-11 | Circuit of microcomputer protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214755476U true CN214755476U (en) | 2021-11-16 |
Family
ID=78631325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022940393.8U Active CN214755476U (en) | 2020-12-11 | 2020-12-11 | Circuit of microcomputer protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214755476U (en) |
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2020
- 2020-12-11 CN CN202022940393.8U patent/CN214755476U/en active Active
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