CN100414306C - Overcurrent alarming circuit - Google Patents
Overcurrent alarming circuit Download PDFInfo
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- CN100414306C CN100414306C CNB2005101277402A CN200510127740A CN100414306C CN 100414306 C CN100414306 C CN 100414306C CN B2005101277402 A CNB2005101277402 A CN B2005101277402A CN 200510127740 A CN200510127740 A CN 200510127740A CN 100414306 C CN100414306 C CN 100414306C
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Abstract
The present invention provides an overcurrent alarming circuit of which the core is that: a current detection circuit is connected with current which needs to be detected in series; the current detection circuit provides corresponding voltage for the first input end of a comparison circuit according to current which flows through a load; an output voltage adjustment element is connected with the second input end of the comparison circuit to provide dynamic adjustable voltage for the second input end of the comparison circuit; the comparison circuit is used for comparing the voltage on the two input ends and determining the overcurrent of the current flowing through the load according to comparative results to generate an overcurrent alarming signal. The overcurrent alarming circuit of the present invention can flexibly realize overcurrent alarming according to different overcurrent alarming needs. Thus, the application of the overcurrent alarming circuit is not limited by fixing threshold. The realization method of the present invention is simple; the present invention realizes the application scope of the overcurrent alarming circuit of enlarged current, saves hardware resource, and improves the realization flexibility of equipment.
Description
Technical field
The present invention relates to electronic equipment, be specifically related to a kind of overcurrent alarming circuit.
Background technology
It's the life-span that conference influences load is past the electric current of load of flowing through, serious meeting infringement load.
For some important electron equipment, generally all can overcurrent alarming circuit be set for it, when the electric current of load surpasses the scheduled current threshold value, produce alarm signal, avoid the infringement of overcurrent according to the methods such as power supply that alarm signal is taked to cut off load to load.
Estimated current overcurrent warning circuit is mainly by current detection circuit, thresholding element and comparator circuit are formed, it realizes that mainly principle is: current detection circuit detects the electric current of load, provide a voltage according to the electric current of the detected load of flowing through for an input end of comparator circuit, the thresholding element provides a fixing voltage threshold, the thresholding element provides voltage for another input end of current comparison circuit, whether the electric current that comparator circuit is judged the load of flowing through according to the voltage of two input end overcurrent, and when determining to flow through the overcurrent of load, produce alarm signal.
In actual application, when external circumstances changes, when changing as the load rating output power, the voltage threshold that the thresholding element provides need be adjusted.Thresholding element in the above-mentioned overcurrent alarming circuit can only provide the fixed voltage threshold value, be that the thresholding element can not change the voltage that it is provided at the comparator circuit input end, above-mentioned current comparison circuit is merely able to by changing the variation that hardware mode adapts to extraneous circumstance, not only caused the waste of hardware resource, and, work at the scene etc. under the environment, changing hardware is impossible realize.
In sum, existing overcurrent alarming circuit can not be realized the overcurrent alarm function flexibly, makes the range of application of overcurrent alarming circuit limited, and has limited the realization dirigibility of its place equipment.
Summary of the invention
The objective of the invention is to, a kind of overcurrent alarming circuit is provided, by different voltage thresholds is provided for comparator circuit, make overcurrent alarming circuit need to produce the overcurrent alarm signal, realize the dirigibility purpose to realize the range of application economize on hardware resource, that improve overcurrent alarming circuit, raising equipment at different overcurrent alarms.
For achieving the above object, a kind of overcurrent alarming circuit provided by the invention comprises: be made up of current detection circuit, Adjustable Output Voltage element and comparator circuit;
Current detection circuit connect with the load that need to detect electric current, and the flow through electric current of load of current detection circuit basis provides correspondent voltage for the first input end of comparator circuit;
The Adjustable Output Voltage element is connected with second input end of comparator circuit, and the voltage of dynamic adjustable is provided for second input end of comparator circuit; The voltage of described dynamic adjustable is by the external command setting;
The voltage of more described two input ends of comparator circuit, and according to comparative result when determining to flow through the overcurrent of load, produce the overcurrent alarm signal.
Described current detection circuit comprises: current sense resistor, current detecting chip;
Connect with load after described current sense resistor and the parallel connection of current detecting chip.
Described Adjustable Output Voltage element comprises: D/A converter.
Described Adjustable Output Voltage element comprises: digital regulation resistance;
The centre tap of described digital regulation resistance is connected with second input end of described comparator circuit.
Described first input end is: hold in the same way, described second input end is: backward end, and described comparator circuit produces the overcurrent alarm signal of high level when the voltage of the high backward end of determining to hold in the same way of voltage.
Described first input end is: backward end, described second input end is: end, and described comparator circuit in the same way produces low level overcurrent alarm signal when determining that the voltage of end is higher than the voltage of backward end in the same way.
Description by technique scheme can obviously be learnt, the present invention is by being provided with the Adjustable Output Voltage element in overcurrent alarming circuit, this Adjustable Output Voltage element can provide different voltage thresholds for comparator circuit, make the restriction of the voltage threshold that the application of overcurrent alarming circuit of the present invention do not fixed, make overcurrent alarming circuit of the present invention realize the overcurrent alarm flexibly according to different overcurrent alarm needs; Adjustable Output Voltage element among the present invention can wait by D/A converter, digital regulation resistance and realize, makes implementation method of the present invention simple; Thereby by technical scheme provided by the invention realized enlarging overcurrent alarming circuit range of application, economize on hardware resource, improve the purpose of the realization dirigibility of its place equipment.
Description of drawings
Fig. 1 is the overcurrent alarming circuit synoptic diagram 1 of the embodiment of the invention;
Fig. 2 is the overcurrent alarming circuit synoptic diagram 2 of the embodiment of the invention.
Embodiment
Overcurrent alarming circuit of the present invention is made up of current detection circuit, Adjustable Output Voltage element and comparator circuit, and the output voltage of Adjustable Output Voltage element can be provided with flexibly by peripheral operation.Current detection circuit is connected with the load that needs to detect electric current, current detection circuit provides correspondent voltage according to the electric current of the load of flowing through for the first input end of comparator circuit, the Adjustable Output Voltage element is connected with second input end of comparator circuit, Adjustable Output Voltage element voltage threshold according to actual needs provides voltage for second input end of comparator circuit, the voltage of more described two input ends of comparator circuit, and when determining to flow through the overcurrent of load, produce the overcurrent alarm signal according to the comparative result of two input terminal voltage sizes.
Current detection circuit of the present invention can be made up of current detecting chip and current sense resistor, Adjustable Output Voltage element such as digital potentiometer, D/A converter etc.The first input end of comparator circuit can be for holding in the same way, and at this moment, second input end of comparator circuit is a backward end.The first input end of comparator circuit can be backward end, and at this moment, second input end of comparator circuit is for holding in the same way.
Be further described below in conjunction with accompanying drawing 1,2 pairs of technical schemes provided by the invention of accompanying drawing.
In Fig. 1, to connect with load after current detecting chip and the current sense resistor parallel connection, the output terminal of current detecting chip is connected with the end in the same way of comparator circuit, provides certain voltage according to the electric current of the load of flowing through for the end in the same way of comparator circuit.D/A converter is connected with the backward end of comparator circuit, according to the threshold value of predefined load current the voltage output value of D/A converter is set, and D/A converter provides voltage threshold according to predefined voltage output value for the backward end of comparator circuit.Comparator circuit holds the voltage with backward end to compare to it in the same way, is higher than the voltage of backward end at the voltage of end in the same way, and then comparator circuit produces the overcurrent alarm signal of a high level.
In Fig. 1, if the output terminal of current detecting chip is connected with the backward end of comparator circuit, D/A converter is connected with the end in the same way of comparator circuit, when then comparator circuit holds voltage with backward end to compare to it in the same way, be lower than the voltage of backward end at the voltage of end in the same way, then comparator circuit produces a low level overcurrent alarm signal.
In Fig. 2, to connect with load after current detecting chip and the current sense resistor parallel connection, the output terminal of current detecting chip is connected with the end in the same way of comparator circuit, provides certain voltage according to the electric current of the load of flowing through for the end in the same way of comparator circuit.Digital regulation resistance is connected with the backward end of comparator circuit, adjusts the resistance value of digital regulation resistance according to the threshold value of predefined load current, and digital regulation resistance provides voltage threshold according to the resistance value of adjusting for the backward end of comparator circuit.Comparator circuit holds the voltage with backward end to compare to it in the same way, and when the voltage of end was higher than the voltage of backward end in the same way, comparator circuit produced the overcurrent alarm signal of a high level.
In Fig. 2, if the output terminal of current detecting chip is connected with the backward end of comparator circuit, digital regulation resistance is connected with the end in the same way of comparator circuit, when then comparator circuit holds voltage with backward end to compare to it in the same way, be lower than the voltage of backward end at the voltage of end in the same way, comparator circuit produces a low level overcurrent alarm signal.
Description by technique scheme can obviously be learnt, the present invention is by being provided with the Adjustable Output Voltage element in overcurrent alarming circuit, this Adjustable Output Voltage element can provide different voltage thresholds for comparator circuit, make the restriction of the voltage threshold that the application of overcurrent alarming circuit of the present invention do not fixed, make overcurrent alarming circuit of the present invention realize the overcurrent alarm flexibly according to different overcurrent alarm needs; Thereby realized enlarging overcurrent alarming circuit range of application, economize on hardware resource, improve the purpose of the realization dirigibility of its place equipment.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (6)
1. an overcurrent alarming circuit is characterized in that, comprising: be made up of current detection circuit, Adjustable Output Voltage element and comparator circuit;
Current detection circuit connect with the load that need to detect electric current, and the flow through electric current of load of current detection circuit basis provides correspondent voltage for the first input end of comparator circuit;
The Adjustable Output Voltage element is connected with second input end of comparator circuit, and the voltage of dynamic adjustable is provided for second input end of comparator circuit; The voltage of described dynamic adjustable is by the external command setting;
The voltage of more described two input ends of comparator circuit, and according to comparative result when determining to flow through the overcurrent of load, produce the overcurrent alarm signal.
2. a kind of overcurrent alarming circuit as claimed in claim 1 is characterized in that, described current detection circuit comprises: current sense resistor, current detecting chip;
Connect with load after described current sense resistor and the parallel connection of current detecting chip.
3. a kind of overcurrent alarming circuit as claimed in claim 1 or 2 is characterized in that, described Adjustable Output Voltage element comprises: D/A converter.
4. a kind of overcurrent alarming circuit as claimed in claim 1 or 2 is characterized in that, described Adjustable Output Voltage element comprises: digital regulation resistance;
The centre tap of described digital regulation resistance is connected with second input end of described comparator circuit.
5. a kind of overcurrent alarming circuit as claimed in claim 1 or 2 is characterized in that:
Described first input end is: hold in the same way, described second input end is: backward end, and described comparator circuit produces the overcurrent alarm signal of high level when determining that the voltage of end is higher than the voltage of backward end in the same way.
6. a kind of overcurrent alarming circuit as claimed in claim 1 or 2 is characterized in that:
Described first input end is: backward end, described second input end is: end, and described comparator circuit in the same way produces low level overcurrent alarm signal when determining that the voltage of end is lower than the voltage of backward end in the same way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101277402A CN100414306C (en) | 2005-12-05 | 2005-12-05 | Overcurrent alarming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101277402A CN100414306C (en) | 2005-12-05 | 2005-12-05 | Overcurrent alarming circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1866035A CN1866035A (en) | 2006-11-22 |
| CN100414306C true CN100414306C (en) | 2008-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101277402A Active CN100414306C (en) | 2005-12-05 | 2005-12-05 | Overcurrent alarming circuit |
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| CN (1) | CN100414306C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661055B (en) * | 2008-08-27 | 2011-07-13 | 中兴通讯股份有限公司 | Current alarm method and current alarm device of active circuit |
| CN102681531B (en) * | 2012-05-10 | 2014-02-05 | 四川金网通电子科技有限公司 | Method for implementing self-calibration of current-limiting current value of motor controller |
| CN103575964B (en) * | 2012-07-19 | 2016-03-23 | 快捷半导体(苏州)有限公司 | A kind of over-current detection circuit of power switch pipe and method |
| GB201311918D0 (en) * | 2013-07-03 | 2013-08-14 | Cooper Technologies Co | Voltage-limiter monitoring |
| CN105162075A (en) * | 2015-08-25 | 2015-12-16 | 昆山龙腾光电有限公司 | Over-current protection module and power supply device |
| CN110389249B (en) * | 2018-04-23 | 2022-02-15 | 广州小鹏汽车科技有限公司 | Detection device |
| CN109728564B (en) * | 2018-12-28 | 2020-02-28 | 郑州云海信息技术有限公司 | Circuit overcurrent protection device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2060266U (en) * | 1989-12-06 | 1990-08-08 | 熊运斌 | Protector for using electricity |
| CN1207831A (en) * | 1995-11-28 | 1999-02-10 | 雷伊化学公司 | Circuit protection arrangements |
| US6108182A (en) * | 1998-10-30 | 2000-08-22 | Intersil Corporation | Overcurrent sensing circuit and self adjusting blanking |
| CN1474490A (en) * | 2002-08-08 | 2004-02-11 | 深圳市中兴通讯股份有限公司 | Monostable comparator device |
| CN1661379A (en) * | 2004-02-26 | 2005-08-31 | 三美电机株式会社 | Current detection circuit and protection circuit |
-
2005
- 2005-12-05 CN CNB2005101277402A patent/CN100414306C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2060266U (en) * | 1989-12-06 | 1990-08-08 | 熊运斌 | Protector for using electricity |
| CN1207831A (en) * | 1995-11-28 | 1999-02-10 | 雷伊化学公司 | Circuit protection arrangements |
| US6108182A (en) * | 1998-10-30 | 2000-08-22 | Intersil Corporation | Overcurrent sensing circuit and self adjusting blanking |
| CN1474490A (en) * | 2002-08-08 | 2004-02-11 | 深圳市中兴通讯股份有限公司 | Monostable comparator device |
| CN1661379A (en) * | 2004-02-26 | 2005-08-31 | 三美电机株式会社 | Current detection circuit and protection circuit |
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| CN1866035A (en) | 2006-11-22 |
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