CN218938462U - DC power supply voltage sampling assembly for feeder terminal device - Google Patents
DC power supply voltage sampling assembly for feeder terminal device Download PDFInfo
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- CN218938462U CN218938462U CN202223190580.4U CN202223190580U CN218938462U CN 218938462 U CN218938462 U CN 218938462U CN 202223190580 U CN202223190580 U CN 202223190580U CN 218938462 U CN218938462 U CN 218938462U
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Abstract
The utility model belongs to the technical field of measuring instruments, and particularly relates to a direct-current power supply voltage sampling assembly for a feeder terminal device, which comprises: the voltage dividing module, the filtering module, the first operational amplifier module, the isolation input module and the voltage following module are connected in sequence; the voltage division module samples a voltage signal of the direct current power supply to divide the voltage signal; the filtering module filters low-frequency ripple interference of a power supply in the voltage signal; the first operational amplifier module amplifies the voltage signal to send the voltage signal to the isolation input module; after the voltage signal is electrically isolated by the isolation input module, the voltage following module outputs the buffered voltage signal to the singlechip; the utility model can ensure the linearity of input and output under the condition of effective isolation by arranging the isolation input module, has good linearity and simple circuit, effectively solves the problem of electric isolation between analog signals and a singlechip, and can improve the linearity by adopting a combined operational amplifier for a driving stage and a buffer stage.
Description
Technical Field
The utility model belongs to the technical field of measuring instruments, and particularly relates to a direct-current power supply voltage sampling assembly for a feeder terminal device.
Background
The feeder terminal device has remote control, remote signaling and fault detection functions, is communicated with the distribution automation master station, provides information required by the operation condition and various parameters of the distribution system, namely monitoring and controlling, including the switching state, the electric energy parameters, interphase faults, grounding faults and parameters during faults, executes commands issued by the distribution master station, adjusts and controls distribution equipment, and achieves the functions of fault positioning, fault isolation and rapid recovery and power supply in non-fault areas. In order to meet the above requirements, the feeder terminal device needs to be always in an operating state, and when the external power supply is disconnected, the feeder terminal device needs to be immediately put into a storage battery, and if the direct-current power supply voltage sampling circuit part works inaccurately, some misoperation can be caused.
The existing direct-current power supply voltage sampling circuit commonly adopts a resistor voltage division or a voltage sensor to realize direct-current power supply voltage sampling. The resistor voltage division sampling circuit has the defects of incapability of isolation and poor linearity, and a power supply fails to damage a later-stage singlechip chip, so that the loss is large. The voltage sensor sampling circuit has high cost, large volume and larger occupied PCB area.
Therefore, there is a need to develop a new dc power supply voltage sampling assembly for use on feeder terminal devices to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to provide a direct-current power supply voltage sampling assembly used on a feeder terminal device.
In order to solve the above technical problem, the present utility model provides a dc power supply voltage sampling assembly for a feeder terminal device, which includes: the voltage dividing module, the filtering module, the first operational amplifier module, the isolation input module and the voltage following module are connected in sequence; the input end of the voltage dividing module is connected with a direct current power supply output by the alternating current power supply module, and the output end of the voltage following module is connected with the singlechip; the voltage dividing module is suitable for sampling a voltage signal of the direct current power supply to divide the voltage signal; the filtering module is suitable for filtering low-frequency ripple interference of a power supply in the voltage signal; the first operational amplifier module is suitable for amplifying a voltage signal to be sent to the isolation input module; after the voltage signal is electrically isolated by the isolation input module, the voltage following module outputs the buffered voltage signal to the singlechip.
Further, the voltage dividing module includes: a voltage dividing circuit; the voltage dividing circuit is suitable for sampling a voltage signal of the direct current power supply and dividing the voltage signal.
Further, a first voltage dividing resistor and a second voltage dividing resistor are arranged in the voltage dividing circuit, and voltage signals are divided through the first voltage dividing resistor and the second voltage dividing resistor.
Further, the filtering module includes: a filter circuit; the filter circuit is suitable for filtering low-frequency ripple interference of a power supply in the voltage signal.
Further, a first filter capacitor is arranged in the filter circuit, and the voltage signal passes through the filter capacitor to filter low-frequency ripple interference of the power supply.
Further, the first operational amplifier module includes: a first operational amplifier circuit; the first operational amplifier circuit is suitable for amplifying a voltage signal to be sent to the isolation input module.
Further, a first operational amplifier is arranged in the first operational amplifier circuit to perform operational amplification on the voltage signal.
Further, the isolated input module includes: isolating the input circuit; the isolation input circuit is adapted to electrically isolate the voltage signal.
Further, the isolated input circuit includes: a linear optocoupler; the linear optocoupler is internally provided with a luminous tube, a feedback photodiode and an output photodiode, and when a driving current If passes through a first pin and a second pin of the linear optocoupler, infrared light is emitted; the infrared light is irradiated on the feedback photodiode and the output photodiode, and the feedback photodiode absorbs a part of the luminous flux to generate a control current I1; the control current I1 is suitable for adjusting the driving current If to compensate the nonlinearity of the luminous tube; the output photodiode generates an output current I2 that is linearly proportional to the servo luminous flux emitted by the luminous tube to electrically isolate the voltage signal.
Further, the voltage follower module includes: a voltage follower; the voltage follower buffers the voltage signal to send the voltage signal into the singlechip.
The utility model has the beneficial effects that the linearity of input and output can be ensured under the condition of effective isolation by arranging the isolation input module, the linearity is good, the circuit is simple, the problem of electrical isolation between an analog signal and a singlechip is effectively solved, and the linearity can be improved by adopting the combined operational amplifier for the driving stage and the buffer stage.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a dc supply voltage sampling assembly for use on a feeder terminal device of the present utility model;
FIG. 2 is a circuit diagram of a voltage divider module and a filter module of the present utility model;
FIG. 3 is a circuit diagram of a first operational amplifier module of the present utility model;
FIG. 4 is a circuit diagram of an isolated input module of the present utility model;
fig. 5 is a circuit diagram of the voltage follower module of the present utility model.
In the figure:
r2, a first voltage dividing resistor; r5, a second voltage dividing resistor; c7, a first filter capacitor; u2, a first operational amplifier; u1, a linear optocoupler; l, luminotron; PD1, a feedback photodiode; PD2, output photodiode; u3, a voltage follower.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
In this embodiment, as shown in fig. 1 to 5, the present embodiment provides a dc power supply voltage sampling assembly for use on a feeder terminal device, which includes: the voltage dividing module, the filtering module, the first operational amplifier module, the isolation input module and the voltage following module are connected in sequence; the input end of the voltage dividing module is connected with a direct current power supply output by the alternating current power supply module, and the output end of the voltage following module is connected with the singlechip; the voltage dividing module is suitable for sampling a voltage signal of the direct current power supply to divide the voltage signal; the filtering module is suitable for filtering low-frequency ripple interference of a power supply in the voltage signal; the first operational amplifier module is suitable for amplifying a voltage signal to be sent to the isolation input module; after the voltage signal is electrically isolated by the isolation input module, the voltage following module outputs the buffered voltage signal to the singlechip.
In the embodiment, the linearity of input and output can be guaranteed under the condition of effective isolation by arranging the isolation input module, the linearity is good, the circuit is simple, the problem of electrical isolation between an analog signal and a singlechip is effectively solved, and the linearity can be improved by adopting a combined operational amplifier for a driving stage and a buffer stage.
In this embodiment, the voltage dividing module includes: a voltage dividing circuit; the voltage dividing circuit is suitable for sampling a voltage signal of the direct current power supply and dividing the voltage signal.
In this embodiment, a first voltage dividing resistor R2 and a second voltage dividing resistor R5 are disposed in the voltage dividing circuit, and the voltage signal is divided by the first voltage dividing resistor R2 and the second voltage dividing resistor R5.
In this embodiment, the filtering module includes: a filter circuit; the filter circuit is suitable for filtering low-frequency ripple interference of a power supply in the voltage signal.
In this embodiment, a first filter capacitor C7 is disposed in the filter circuit, and the voltage signal passes through the filter capacitor to filter out low-frequency ripple interference of the power supply.
In this embodiment, VIN is a dc power supply output by the ac power supply module, and the voltage signal is divided by the first voltage dividing resistor R2 and the second voltage dividing resistor R5 and is in the input range of the operational amplifier of the first operational amplifier module, and the first filter capacitor C7 is used to filter low-frequency ripple interference of the power supply.
In this embodiment, the first op-amp module includes: a first operational amplifier circuit; the first operational amplifier circuit is suitable for amplifying a voltage signal to be sent to the isolation input module.
In this embodiment, the first operational amplifier U2 is disposed in the first operational amplifier circuit to perform operational amplification on the voltage signal.
In this embodiment, the first operational amplifier U2 has a function of improving driving force, and the capacitor C1 is a power supply filter capacitor of the first operational amplifier U2 in order to improve stability of the first operational amplifier U2, and the capacitor C2 and the capacitor C3 are capacitors.
In this embodiment, the isolation input module includes: isolating the input circuit; the isolation input circuit is adapted to electrically isolate the voltage signal.
In this embodiment, the isolation input circuit includes: a linear optocoupler U1; a luminous tube L, a feedback photodiode PD1 and an output photodiode PD2 are arranged in the linear optocoupler U1, and when a driving current If passes through a first pin and a second pin of the linear optocoupler U1, infrared light is emitted; the infrared light is irradiated onto the feedback photodiode PD1 and the output photodiode PD2, and the feedback photodiode PD1 absorbs a part of the luminous flux to generate the control current I1; the control current I1 is suitable for adjusting the driving current If to compensate the nonlinearity of the luminous tube L; the output photodiode PD2 generates an output current I2 that is linearly proportional to the servo luminous flux emitted from the luminous tube L to electrically isolate the voltage signal.
In this embodiment, the resistor R4 is used to adjust the driving current If of the light emitting tube L in the linear optocoupler U1, and the current on the resistor R3 is the control current I1 of the feedback photodiode PD1 in the linear optocoupler U1.
In this embodiment, the voltage follower module includes: a voltage follower U3; the voltage follower U3 buffers the voltage signal to send the voltage signal into the singlechip.
In this embodiment, the voltage follower U3 and the peripheral circuit can provide system stability, further isolate the signal acquisition end from the ADC input end of the single-chip microcomputer, and also reduce interference of ADC sampling of the single-chip microcomputer to the power input end.
In this embodiment, the resistor R6 satisfies impedance matching at the ADC input end of the subsequent-stage singlechip, and the capacitor C8 is used to filter out low-frequency interference.
In summary, the utility model can ensure the linearity of input and output under the condition of effective isolation by arranging the isolation input module, has good linearity and simple circuit, effectively solves the problem of electrical isolation between analog signals and a singlechip, and improves the linearity by adopting a combined operational amplifier for a driving stage and a buffer stage.
The components (components not illustrating specific structures) selected in the application are all common standard components or components known to those skilled in the art, and the structures and principles of the components are all known to those skilled in the art through technical manuals or through routine experimental methods. Moreover, the software programs referred to in the present application are all prior art, and the present application does not relate to any improvement of the software programs.
In the description of embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present utility model may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. A dc power supply voltage sampling assembly for use on a feeder terminal device, comprising:
the voltage dividing module, the filtering module, the first operational amplifier module, the isolation input module and the voltage following module are connected in sequence; wherein the method comprises the steps of
The input end of the voltage dividing module is connected with a direct current power supply output by the alternating current power supply module, and the output end of the voltage following module is connected with the singlechip;
the voltage dividing module is suitable for sampling a voltage signal of the direct current power supply to divide the voltage signal;
the filtering module is suitable for filtering low-frequency ripple interference of a power supply in the voltage signal;
the first operational amplifier module is suitable for amplifying a voltage signal to be sent to the isolation input module;
after the voltage signal is electrically isolated by the isolation input module, the voltage following module outputs the buffered voltage signal to the singlechip.
2. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 1,
the voltage dividing module includes: a voltage dividing circuit;
the voltage dividing circuit is suitable for sampling a voltage signal of the direct current power supply and dividing the voltage signal.
3. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 2, wherein,
the voltage dividing circuit is provided with a first voltage dividing resistor and a second voltage dividing resistor, and voltage signals are divided by the first voltage dividing resistor and the second voltage dividing resistor.
4. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 1,
the filtering module includes: a filter circuit;
the filter circuit is suitable for filtering low-frequency ripple interference of a power supply in the voltage signal.
5. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 4,
the filter circuit is internally provided with a first filter capacitor, and the voltage signal passes through the filter capacitor to filter low-frequency ripple interference of the power supply.
6. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 1,
the first operational amplifier module includes: a first operational amplifier circuit;
the first operational amplifier circuit is suitable for amplifying a voltage signal to be sent to the isolation input module.
7. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 6, wherein,
the first operational amplifier is arranged in the first operational amplifier circuit so as to carry out operational amplification on the voltage signal.
8. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 1,
the isolated input module includes: isolating the input circuit;
the isolation input circuit is adapted to electrically isolate the voltage signal.
9. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 8, wherein,
the isolated input circuit includes: a linear optocoupler;
the linear optocoupler is internally provided with a luminous tube, a feedback photodiode and an output photodiode, and when a driving current If passes through a first pin and a second pin of the linear optocoupler, infrared light is emitted;
the infrared light is irradiated on the feedback photodiode and the output photodiode, and the feedback photodiode absorbs a part of the luminous flux to generate a control current I1;
the control current I1 is suitable for adjusting the driving current If to compensate the nonlinearity of the luminous tube;
the output photodiode generates an output current I2 that is linearly proportional to the servo luminous flux emitted by the luminous tube to electrically isolate the voltage signal.
10. A DC power supply voltage sampling assembly for use on a feeder terminal device as recited in claim 1,
the voltage follower module includes: a voltage follower;
the voltage follower buffers the voltage signal to send the voltage signal into the singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223190580.4U CN218938462U (en) | 2022-11-30 | 2022-11-30 | DC power supply voltage sampling assembly for feeder terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223190580.4U CN218938462U (en) | 2022-11-30 | 2022-11-30 | DC power supply voltage sampling assembly for feeder terminal device |
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| Publication Number | Publication Date |
|---|---|
| CN218938462U true CN218938462U (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223190580.4U Active CN218938462U (en) | 2022-11-30 | 2022-11-30 | DC power supply voltage sampling assembly for feeder terminal device |
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| CN (1) | CN218938462U (en) |
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- 2022-11-30 CN CN202223190580.4U patent/CN218938462U/en active Active
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