CN203101499U - Voltage acquisition circuit - Google Patents
Voltage acquisition circuit Download PDFInfo
- Publication number
- CN203101499U CN203101499U CN 201320040958 CN201320040958U CN203101499U CN 203101499 U CN203101499 U CN 203101499U CN 201320040958 CN201320040958 CN 201320040958 CN 201320040958 U CN201320040958 U CN 201320040958U CN 203101499 U CN203101499 U CN 203101499U
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- voltage
- module
- circuit
- amplifier
- mutual inductor
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Abstract
The utility model relates to the field of circuit design, particularly to a voltage acquisition circuit. The voltage acquisition circuit comprises a mutual inductor board and a CPU board, wherein a voltage current conversion module is disposed on the mutual inductor board, and a signal conditioning circuit module is disposed on the CPU board. The signal conditioning circuit module includes a current acquisition module and a difference amplification module that is electrically connected with the current acquisition module. The difference amplification module includes an amplifier, wherein an input end of the amplifier is connected in parallel with a forward-conductive first Zener diode and a reverse-conductive second Zener diode. The voltage acquisition circuit helps to improve capability of anti-interference, capability of common-mode interference resistance, and circuit stability.
Description
Technical field
The utility model relates to circuit design field, relates in particular to a kind of voltage collection circuit.
Background technology
Usually need to measure phase voltage or line voltage in electric system, voltage is to equipment operation safety, and electrical network distribution etc. are significant.General voltage cut-in method is divided into two kinds of three-phase three-wire system and three-phase four-wire systems in the system, the three-phase three-wire system connection owing to there is not neutral point, so phase voltage is nonsensical, can only obtain line voltage, and three-phase four-wire system can accurately obtain phase voltage and line voltage.The now general voltage collection circuit that adopts is that whole sampling modulate circuit all is placed on the mutual inductor plate, conditioned then signal AI01, and AI02, AI03 is connected on the AD on the CPU board by flexible cord by terminal.There are 2 shortcomings in this circuit: 1, because not protection of amplifier, high pressure can be added on the amplifier when the output terminal of voltage transformer (VT) produces high pressure amplifier is punctured; 2. be voltage signal owing to conditioned signal, but also will be connected on the CPU board with long flexible cord.Voltage signal is original just to be interfered easily, like this with long line connection, made that conditioned signal is easier to be interfered.
The utility model content
The problem that the utility model solves is the defective that existing voltage collection circuit amplifier easily punctures, signal is vulnerable to disturb, and provides a kind of voltage collection circuit, its good stability.
The utility model embodiment provides a kind of voltage collection circuit, comprises mutual inductor plate and CPU board, on the described mutual inductor plate electric current and voltage modular converter is set, signalization conditioning circuit module on the described CPU board; Described signal conditioning circuit module comprises a current acquisition module and the difference amplification module that is electrically connected with described current acquisition module.
To further improvement in the technical proposal be, described difference amplification module comprises amplifier, first voltage stabilizing diode of a described amplifier input terminal forward conduction in parallel and second voltage stabilizing diode of a reverse-conducting.
Voltage collection circuit described in the utility model, beneficial effect is:
One) output terminal of mutual inductor plate is a current mode, so being connected between mutual inductor plate and CPU board also is the current mode connection, because any point electric current is all identical in the loop, so the electric current on the mutual inductor plate is identical with the electric current on the CPU board, at this moment by sample resistance R1, R2, R3 current signal is converted to voltage signal again, has improved antijamming capability greatly.
Two) modulate circuit adopts differential amplifier circuit, has improved the anti-common mode interference ability of circuit.
Three) added positive and negative two voltage stabilizing diodes at amp.in, the protection operational amplifier has improved circuit stability.
Description of drawings
Accompanying drawing 1 is the structural representation of the utility model voltage collection circuit;
Wherein:
1, mutual inductor plate 2, CPU board 3, electric current and voltage modular converter
4, signal conditioning circuit module 5, current acquisition module 6, difference amplification module
7, amplifier 8, first voltage stabilizing diode 9, second voltage stabilizing diode
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing.
Voltage collection circuit described in the utility model as shown in Figure 1, comprises mutual inductor plate 1 and CPU board 2, and an electric current and voltage modular converter 3 is set on the mutual inductor plate 1; Signalization conditioning circuit module 4 on the CPU board 2.
Signal conditioning circuit module 4 comprises a current acquisition module 5 and the difference amplification module 6 that is electrically connected with current acquisition module 5.
As shown in Figure 2, difference amplification module 6 comprises amplifier 7, first voltage stabilizing diode 8 of the input end of amplifier 7 forward conduction in parallel and second voltage stabilizing diode 9 of a reverse-conducting.
Mutual inductor plate 1 output terminal is a current mode, AI01 in the current acquisition module 5, and AI02, AI03 is connected on the AD of CPU board by flexible cord.
Because mutual inductor plate 1 output terminal is that current mode is so mutual inductor plate 1 also is the current mode connection with being connected of current acquisition module 5, because any point electric current is all identical in the loop, so the electric current on the mutual inductance plate 1 is identical with the electric current on the current acquisition module 5, at this moment by sample resistance R1, R2, R3 current signal is converted to voltage signal again, has improved antijamming capability greatly.
Modulate circuit adopts differential amplifier circuit, improves the anti-common mode interference ability of circuit.
Positive and negative two voltage stabilizing diodes have been added at amplifier 7 input ends, with the protection operational amplifier.
The above is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection domain of the present utility model.
Claims (2)
1. voltage collection circuit comprises that mutual inductor plate (1) and CPU board (2) is characterized in that:
Electric current and voltage modular converter (3) is set, signalization conditioning circuit module (4) on the described CPU board on the described mutual inductor plate (1);
Described signal conditioning circuit module (4) comprises a current acquisition module (5) and the difference amplification module (6) that is electrically connected with described current acquisition module (5).
2. voltage collection circuit according to claim 1 is characterized in that:
Described difference amplification module (6) comprises amplifier (7), first voltage stabilizing diode (8) of the input end of described amplifier (a 7) forward conduction in parallel and second voltage stabilizing diode (9) of a reverse-conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320040958 CN203101499U (en) | 2013-01-25 | 2013-01-25 | Voltage acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320040958 CN203101499U (en) | 2013-01-25 | 2013-01-25 | Voltage acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203101499U true CN203101499U (en) | 2013-07-31 |
Family
ID=48852889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320040958 Expired - Fee Related CN203101499U (en) | 2013-01-25 | 2013-01-25 | Voltage acquisition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203101499U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124845A (en) * | 2016-08-30 | 2016-11-16 | 李纳 | Novel voltage detecting system |
| CN106370923A (en) * | 2016-08-30 | 2017-02-01 | 李纳 | Voltage monitoring device |
-
2013
- 2013-01-25 CN CN 201320040958 patent/CN203101499U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124845A (en) * | 2016-08-30 | 2016-11-16 | 李纳 | Novel voltage detecting system |
| CN106370923A (en) * | 2016-08-30 | 2017-02-01 | 李纳 | Voltage monitoring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20220125 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |