CN102353826A - Circuit for acquiring tiny voltage variation on high-direct-current-voltage bus - Google Patents
Circuit for acquiring tiny voltage variation on high-direct-current-voltage bus Download PDFInfo
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- CN102353826A CN102353826A CN2011101512889A CN201110151288A CN102353826A CN 102353826 A CN102353826 A CN 102353826A CN 2011101512889 A CN2011101512889 A CN 2011101512889A CN 201110151288 A CN201110151288 A CN 201110151288A CN 102353826 A CN102353826 A CN 102353826A
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- resistance
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Abstract
The invention relates to the technical field of circuits, in particular to a circuit for acquiring tiny voltage variation on a high-direct-current-voltage bus. The circuit for acquiring tiny voltage variation on the high-direct-current-voltage bus comprises a first voltage regulator tube (D1), a second voltage regulator tube (D2), a first capacitor (C1), a first resistor (R1) and a second resistor (R2). The invention provides a reliable, simple and convenient circuit for acquiring tiny voltage variation on the high-direct-current-voltage bus.
Description
Technical field
The present invention relates to the circuit engineering field, specifically small voltage variable quantity Acquisition Circuit on the High Level DC Voltage bus.
Background technology
In existing high-voltage direct-current voltage variety Acquisition Circuit; Be with the direct dividing potential drop of big resistance resistance; When decaying to high voltage on the bus, such Acquisition Circuit obtained same decay by the number of accepting and believing; Such as busbar voltage is decayed 1000 times; Being gathered the variable quantity signal so also is 1000 times of decay, if amplify 1000 times with operational amplifier again, but its degree of distortion is very big; Additional noise is exaggerated 1000 times too, and such signal can not reflect truth.
Summary of the invention
The present invention provides small voltage variable quantity Acquisition Circuit on a kind of reliable easy High Level DC Voltage bus.
The present invention realizes through following technical proposals:
Small voltage variable quantity Acquisition Circuit on the High Level DC Voltage bus; Comprise first stabilivolt (D1); Second stabilivolt (D2); First electric capacity (C1); First resistance (R1) and second resistance (R2); The negative electrode of said first stabilivolt (D1) is connected with the positive electrical of first electric capacity (C1); And be electrically connected with dc bus V+ simultaneously; 1 pin of said first resistance (R1) is connected with the anode of first stabilivolt (D1) and the negative electricity of first electric capacity (C1); 2 pin of said first resistance (R1) are connected with 1 pin of second resistance (R2) and the cathodic electricity of second stabilivolt (D2); Be electrically connected with output terminal U0 simultaneously; 2 pin of the anode of said second stabilivolt (D2) and second resistance (R2) are electrically connected, and are electrically connected with dc bus V-simultaneously.
The beneficial effect that the present invention brought is:
Among the present invention; Small voltage variable quantity Acquisition Circuit adopts the mode that first stabilivolt, second stabilivolt and electric capacity combine and uses on the said High Level DC Voltage bus; Prevented the sudden change in the Acquisition Circuit, realized that high precision is prone to the function of gathering, and has also possessed overvoltage protection simultaneously.
Description of drawings
Below in conjunction with accompanying drawing the present invention is done further explain.
Fig. 1 is the synoptic diagram of small voltage variable quantity Acquisition Circuit on the High Level DC Voltage bus according to the invention.
Specifically the code name reference is as follows:
Δ U is the voltage variety on the bus;
U1+ Δ U is the magnitude of voltage before changing on the bus;
U1 is the magnitude of voltage after changing on the bus;
Uz is the voltage stabilizing value of first stabilivolt;
U0 is the voltage variety that is collected in the Acquisition Circuit;
U01 is the magnitude of voltage before the change in voltage in the Acquisition Circuit;
U02 is the magnitude of voltage after the change in voltage in the Acquisition Circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description:
Embodiment as small voltage variable quantity Acquisition Circuit on the High Level DC Voltage bus according to the invention; As shown in Figure 1; Comprise first stabilivolt (D1); Second stabilivolt (D2); First electric capacity (C1); First resistance (R1) and second resistance (R2); The negative electrode of said first stabilivolt (D1) is connected with the positive electrical of first electric capacity (C1); And be electrically connected with dc bus V+ simultaneously; 1 pin of said first resistance (R1) is connected with the anode of first stabilivolt (D1) and the negative electricity of first electric capacity (C1); 2 pin of said first resistance (R1) are connected with 1 pin of second resistance (R2) and the cathodic electricity of second stabilivolt (D2); Be electrically connected with output terminal U0 simultaneously; 2 pin of the anode of said second stabilivolt (D2) and second resistance (R2) are electrically connected, and are electrically connected with dc bus V-simultaneously.
In the present embodiment, the workflow of small voltage variable quantity Acquisition Circuit is following on the said High Level DC Voltage bus:
DC voltage on dc bus V+ is U1+ Δ U, and the voltage at the first stabilivolt two ends is Uz, and the voltage variety on the dc bus is Δ U=U1+ Δ U-U1=Δ U so, and the voltage variety in the Acquisition Circuit is so:
U0＝U01-U02＝(U1+ΔU-Uz)*R2/(R1+R2)-(U1-Uz)*R2/(R1+R2)＝ΔU*R2/(R1+R2)
So: Δ U=U0*R2/ (R1+R2)
Overtension on bus; And the magnitude of voltage in the Acquisition Circuit is also too high; At this moment; Second stabilivolt (D2) just plays the voltage of collection terminal in the protection Acquisition Circuit; Reduced damage to processor; The time constant that changes as Δ U on the bus is far longer than the time constant of first electric capacity (C1) in the circuit; Just can think that the voltage at first electric capacity (C1) two ends equates; Just can prevent effectively that the Acquisition Circuit Hair Fixer that powers on from giving birth to the caused negative factor of sudden change, so just improve the degree of accuracy of Acquisition Circuit greatly.
Claims (1)
1. small voltage variable quantity Acquisition Circuit on the High Level DC Voltage bus; It is characterized in that comprising first stabilivolt (D1); Second stabilivolt (D2); First electric capacity (C1); First resistance (R1) and second resistance (R2); The negative electrode of said first stabilivolt (D1) is connected with the positive electrical of first electric capacity (C1); And be electrically connected with dc bus V+ simultaneously; 1 pin of said first resistance (R1) is connected with the anode of first stabilivolt (D1) and the negative electricity of first electric capacity (C1); 2 pin of said first resistance (R1) are connected with 1 pin of second resistance (R2) and the cathodic electricity of second stabilivolt (D2); Be electrically connected with output terminal U0 simultaneously; 2 pin of the anode of said second stabilivolt (D2) and second resistance (R2) are electrically connected, and are electrically connected with dc bus V-simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101512889A CN102353826A (en) | 2011-06-03 | 2011-06-03 | Circuit for acquiring tiny voltage variation on high-direct-current-voltage bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101512889A CN102353826A (en) | 2011-06-03 | 2011-06-03 | Circuit for acquiring tiny voltage variation on high-direct-current-voltage bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102353826A true CN102353826A (en) | 2012-02-15 |
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ID=45577426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101512889A Pending CN102353826A (en) | 2011-06-03 | 2011-06-03 | Circuit for acquiring tiny voltage variation on high-direct-current-voltage bus |
Country Status (1)
| Country | Link |
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| CN (1) | CN102353826A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH086649A (en) * | 1994-06-17 | 1996-01-12 | Nippon Electric Ind Co Ltd | Direct-current voltage detecting circuit |
| CN201156730Y (en) * | 2008-02-04 | 2008-11-26 | 中国电力科学研究院 | DC voltage collecting apparatus |
| CN201274458Y (en) * | 2008-08-27 | 2009-07-15 | 上海步科电气有限公司 | Circuit for suppressing high frequency oscillation in servo-driver braking system |
| CN101873075A (en) * | 2010-07-02 | 2010-10-27 | 深圳市四方电气技术有限公司 | Collecting circuit for direct current bus |
| CN102023248A (en) * | 2009-09-18 | 2011-04-20 | 哈尔滨九洲电气股份有限公司 | Direct current bus voltage sampling device of medium-voltage frequency converter |
| CN202141753U (en) * | 2011-06-03 | 2012-02-08 | 浙江源创电子科技有限公司 | Collection circuit for tiny voltage variation on high-direct current voltage bus |
-
2011
- 2011-06-03 CN CN2011101512889A patent/CN102353826A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH086649A (en) * | 1994-06-17 | 1996-01-12 | Nippon Electric Ind Co Ltd | Direct-current voltage detecting circuit |
| CN201156730Y (en) * | 2008-02-04 | 2008-11-26 | 中国电力科学研究院 | DC voltage collecting apparatus |
| CN201274458Y (en) * | 2008-08-27 | 2009-07-15 | 上海步科电气有限公司 | Circuit for suppressing high frequency oscillation in servo-driver braking system |
| CN102023248A (en) * | 2009-09-18 | 2011-04-20 | 哈尔滨九洲电气股份有限公司 | Direct current bus voltage sampling device of medium-voltage frequency converter |
| CN101873075A (en) * | 2010-07-02 | 2010-10-27 | 深圳市四方电气技术有限公司 | Collecting circuit for direct current bus |
| CN202141753U (en) * | 2011-06-03 | 2012-02-08 | 浙江源创电子科技有限公司 | Collection circuit for tiny voltage variation on high-direct current voltage bus |
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| PB01 | Publication | ||
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Application publication date: 20120215 |