CN103219694B - Current foldback circuit - Google Patents
Current foldback circuit Download PDFInfo
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- CN103219694B CN103219694B CN201310134017.1A CN201310134017A CN103219694B CN 103219694 B CN103219694 B CN 103219694B CN 201310134017 A CN201310134017 A CN 201310134017A CN 103219694 B CN103219694 B CN 103219694B
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Abstract
The invention discloses a kind of structure comparatively simple; cost is lower; and the current foldback circuit that the overcurrent threshold values being beneficial to the fast and efficient production on streamline is adjustable; it comprises sampling unit, comparing unit, control unit; sampling unit and control unit are electrically connected with comparing unit respectively; it also comprises for exporting the overcurrent threshold values recognition unit (1) identifying voltage; overcurrent threshold values recognition unit (1) is electrically connected with control unit and identifies voltage to export to control unit, identifies voltage for control unit for determining the overcurrent threshold values of current employing.
Description
Technical field
The present invention relates to technical field of circuit design, is specifically a kind of current foldback circuit.
Background technology
Overcurrent protection is overload protection again, and overload is exactly that load is excessive, has exceeded the nominal load of equipment itself, such as power consumption equipment overload, line short, motor generation stall etc.The phenomenon produced is that electric current is excessive, and power consumption equipment generates heat, and circuit transships for a long time and can reduce line insulation level, even burning apparatus or circuit; Current employing current foldback circuit is protected, and therefore, rationally arranges the overcurrent threshold values of current foldback circuit, makes load in pressure point of maximum efficiency work to reach the most desirable output, becomes one of main points of current foldback circuit design.The current foldback circuit that overcurrent threshold values disclosed in prior art is adjustable, it comprises sampling unit, comparing unit, control unit, sampling unit and control unit are electrically connected with comparing unit respectively, sampling unit is for sampling load real-time current be converted to real-time voltage, control unit is used for providing overcurrent threshold values determined overcurrent voltage, comparing unit is used for comparing real-time voltage and overcurrent voltage, when real-time voltage exceedes overcurrent voltage and maintains setting-up time, comparing unit outputs signal to power switch circuit and to cut off the electricity supply output to indicate power switch circuit, thus realize overcurrent protection, in control unit, overcurrent threshold values is modified by the communication of telecommunication circuit and external control system and is set, although it achieve the function that overcurrent threshold values is adjustable, but need telecommunication circuit and external control system, structure is comparatively complicated, cost is higher, and be unfavorable for the fast and efficient production on streamline.
Summary of the invention
The technical problem to be solved in the present invention is, provide a kind of structure comparatively simple, cost is lower, and the current foldback circuit that the overcurrent threshold values being beneficial to the fast and efficient production on streamline is adjustable.
Technical scheme of the present invention is; current foldback circuit of the present invention; it comprises sampling unit, comparing unit, control unit; sampling unit and control unit are electrically connected with comparing unit respectively; it also comprises for exporting the overcurrent threshold values recognition unit identifying voltage; overcurrent threshold values recognition unit is electrically connected with control unit and identifies voltage to export to control unit, identifies voltage for control unit for determining the overcurrent threshold values of current employing.
Operation principle of the present invention is, control unit is preset with multiple overcurrent threshold values, control unit is by identifying voltage determines currently select which overcurrent threshold values, identify that voltage is just equivalent to one and selects signal, like this, the determination of the overcurrent threshold values in control unit is controlled by overcurrent threshold values recognition unit, and overcurrent threshold values recognition unit provides the identification voltage of different value, and control unit just can be made to determine the overcurrent threshold values of current employing.
After adopting said structure, the present invention compared with prior art, has the following advantages: by adopting overcurrent threshold values recognition unit, just overcurrent threshold values can be adjusted without the need to telecommunication circuit and external control system, structure greatly simplifies, and cost is lower, and is beneficial to the fast and efficient production on streamline.
As improvement, control unit comprises the MCU that model is 16F883; Overcurrent threshold values recognition unit comprises the first resistance, the second resistance, electric capacity, the second resistance and Capacitance parallel connection, and a common port in parallel is electrically connected with one end of the first resistance, another common end grounding in parallel, and the other end of the first resistance is connected with+5V power electric; A common port of described parallel connection is also electrically connected with an input of MCU, like this, by adopting the second resistance of different resistance, overcurrent threshold values recognition unit just can be made to provide the reliable and stable identification voltage of different value, structure more simplifies, cost is lower, and is more conducive to the fast and efficient production on streamline.
Accompanying drawing explanation
Fig. 1 is the theory diagram of current foldback circuit of the present invention.
Fig. 2 is the circuit theory diagrams of current foldback circuit of the present invention.
Shown in figure, 1, overcurrent threshold values recognition unit, 2, MCU.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Current foldback circuit of the present invention; it comprises sampling unit, comparing unit, control unit; sampling unit and control unit are electrically connected with comparing unit respectively; it also comprises for exporting the overcurrent threshold values recognition unit 1 identifying voltage; overcurrent threshold values recognition unit 1 is electrically connected with control unit and identifies voltage to export to control unit, identifies voltage for control unit for determining the overcurrent threshold values of current employing.
Control unit comprises the MCU2 that model is 16F883, and MCU2 is exactly single-chip microcomputer; Overcurrent threshold values recognition unit 1 comprises the first resistance, the second resistance, electric capacity, second resistance and Capacitance parallel connection, a common port in parallel is electrically connected with one end of the first resistance, another common end grounding in parallel, and the other end of the first resistance is connected with+5V power electric; A common port of described parallel connection is also electrically connected with an input of MCU2.
Described first resistance, the second resistance are fixed resistance, and resistance value is respectively 10 kilohms and 100 kilohms.
The effect of overcurrent threshold values recognition unit 1 is to provide a stable identification voltage, and physical circuit can be multiple, is not limited to said structure.
Multiple overcurrent threshold values that control unit is preset with are default, adopt prior art.
Claims (1)
1. a current foldback circuit, it comprises sampling unit, comparing unit, control unit, and sampling unit and control unit are electrically connected with comparing unit respectively, it is characterized in that, control unit comprises the MCU (2) that model is 16F883; Described model is that the MCU (2) of 16F883 is simultaneously also as comparing unit; This current foldback circuit also comprises for exporting the overcurrent threshold values recognition unit (1) identifying voltage, overcurrent threshold values recognition unit (1) comprises the first resistance, the second resistance, electric capacity, second resistance and Capacitance parallel connection, a common port in parallel is electrically connected with one end of the first resistance, another common end grounding in parallel, the other end of the first resistance is connected with+5V power electric; A common port of described parallel connection is also electrically connected with an input of MCU (2), by adopting the second resistance of different resistance, overcurrent threshold values recognition unit (1) just can be made to provide the reliable and stable identification voltage of different value, overcurrent threshold values recognition unit (1) is electrically connected with control unit and identifies voltage to export to control unit, identifies voltage for control unit for determining the overcurrent threshold values of current employing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310134017.1A CN103219694B (en) | 2013-04-17 | 2013-04-17 | Current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310134017.1A CN103219694B (en) | 2013-04-17 | 2013-04-17 | Current foldback circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103219694A CN103219694A (en) | 2013-07-24 |
| CN103219694B true CN103219694B (en) | 2015-09-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310134017.1A Active CN103219694B (en) | 2013-04-17 | 2013-04-17 | Current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103219694B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272858A (en) * | 2017-05-26 | 2017-10-20 | 郑州云海信息技术有限公司 | A kind of server adaptive overcurrent protection circuit and adaptive approach |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683931B (en) * | 2013-12-27 | 2016-09-28 | 深圳市航嘉驰源电气股份有限公司 | A kind of power-switching circuit |
| CN107094007B (en) * | 2017-03-08 | 2020-07-21 | 全球能源互联网研究院有限公司 | IGBT overcurrent protection method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0235479B1 (en) * | 1986-01-10 | 1993-08-04 | Merlin Gerin | Static tripping unit with test circuit for electrical circuit interruptor |
| US6222355B1 (en) * | 1998-12-28 | 2001-04-24 | Yazaki Corporation | Power supply control device for protecting a load and method of controlling the same |
| CN1848577A (en) * | 2005-06-17 | 2006-10-18 | 华为技术有限公司 | Overcurrent protection circuit |
| CN101350512A (en) * | 2007-07-19 | 2009-01-21 | 佛山普立华科技有限公司 | Over current protective system |
| CN102150338A (en) * | 2008-09-08 | 2011-08-10 | 三菱电机株式会社 | Overcurrent detection circuit, inverter, compressor, air conditioner, and overcurrent detection circuit adjusting method |
| CN203166463U (en) * | 2013-04-17 | 2013-08-28 | 宁波汉浦工具有限公司 | Over-current protection circuit |
-
2013
- 2013-04-17 CN CN201310134017.1A patent/CN103219694B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0235479B1 (en) * | 1986-01-10 | 1993-08-04 | Merlin Gerin | Static tripping unit with test circuit for electrical circuit interruptor |
| US6222355B1 (en) * | 1998-12-28 | 2001-04-24 | Yazaki Corporation | Power supply control device for protecting a load and method of controlling the same |
| CN1848577A (en) * | 2005-06-17 | 2006-10-18 | 华为技术有限公司 | Overcurrent protection circuit |
| CN101350512A (en) * | 2007-07-19 | 2009-01-21 | 佛山普立华科技有限公司 | Over current protective system |
| CN102150338A (en) * | 2008-09-08 | 2011-08-10 | 三菱电机株式会社 | Overcurrent detection circuit, inverter, compressor, air conditioner, and overcurrent detection circuit adjusting method |
| CN203166463U (en) * | 2013-04-17 | 2013-08-28 | 宁波汉浦工具有限公司 | Over-current protection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型过流保护电路设计;王小龙等;《电子与封装》;20100731;第10卷(第7期);第16-19页 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272858A (en) * | 2017-05-26 | 2017-10-20 | 郑州云海信息技术有限公司 | A kind of server adaptive overcurrent protection circuit and adaptive approach |
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| Publication number | Publication date |
|---|---|
| CN103219694A (en) | 2013-07-24 |
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