CN203166463U - Over-current protection circuit - Google Patents
Over-current protection circuit Download PDFInfo
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- CN203166463U CN203166463U CN 201320196903 CN201320196903U CN203166463U CN 203166463 U CN203166463 U CN 203166463U CN 201320196903 CN201320196903 CN 201320196903 CN 201320196903 U CN201320196903 U CN 201320196903U CN 203166463 U CN203166463 U CN 203166463U
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Abstract
Disclosed in the utility model is an over-current protection circuit with an adjustable over-current threshold value. The over-current protection circuit, which has the advantages of simple structure and low cost and is beneficial to the rapid and high-efficient production at a flow line, comprises a sampling unit, a comparison unit, and a control unit; and the sampling unit and the control unit are respectively and electrically connected with the comparison unit. Besides, the over-current protection circuit also includes an over-current threshold identification unit (1) for outputting an identification voltage; the over-current threshold identification unit (1) is electrically connected with the control unit to output the identification voltage to the control unit; and the identification voltage is used by the control unit to determine an over-current threshold value that is employed currently.
Description
Technical field
The utility model relates to the circuit design technique field, specifically is a kind of current foldback circuit.
Background technology
Overload protection is in overcurrent protection again, and overload is exactly to load excessively, has surpassed the nominal load of equipment itself, such as power consumption equipment overload, line short, motor generation stall etc.The phenomenon that produces is that electric current is excessive, the power consumption equipment heating, and circuit transships for a long time and can reduce the line insulation level, even burning apparatus or circuit; Adopt current foldback circuit to protect at present, therefore, the overcurrent threshold values of current foldback circuit is set rationally, make to load on the work of maximal efficiency point to reach the most desirable output, become one of main points of current foldback circuit design.The adjustable current foldback circuit of the disclosed overcurrent threshold values of prior art; it comprises sampling unit; comparing unit; control unit; sampling unit and control unit are electrically connected with comparing unit respectively; sampling unit is used for sampling load real-time current and is converted to real-time voltage; control unit is used for providing the overcurrent threshold values determined overcurrent voltage; comparing unit is used for relatively real-time voltage and overcurrent voltage; when real-time voltage surpasses overcurrent voltage and keeps setting-up time; comparing unit outputs signal to power switch circuit with the output of cutting off the electricity supply of indication power switch circuit; thereby realization overcurrent protection; the interior overcurrent threshold values of control unit is made amendment by the communication of telecommunication circuit and external control system and is set; though it has realized the adjustable function of overcurrent threshold values; but need telecommunication circuit and external control system; structure is comparatively complicated; cost is higher, and is unfavorable for the fast and efficient production on the streamline.
The utility model content
The technical problems to be solved in the utility model is, provides a kind of structure comparatively simple, and cost is lower, and is beneficial to the adjustable current foldback circuit of overcurrent threshold values of the fast and efficient production on the streamline.
The technical solution of the utility model is; the utility model current foldback circuit; it comprises sampling unit, comparing unit, control unit; sampling unit and control unit are electrically connected with comparing unit respectively; it also comprises the overcurrent threshold values recognition unit for output identification voltage; overcurrent threshold values recognition unit is electrically connected with control unit with to control unit output identification voltage, identifies voltage is used for determining current employing for control unit overcurrent threshold values.
The utility model operation principle is, control unit is preset with a plurality of overcurrent threshold values, control unit is determined current which overcurrent threshold values of selecting for use by identification voltage, identification voltage just is equivalent to one and selects signal, like this, the definite of overcurrent threshold values in the control unit controlled by overcurrent threshold values recognition unit, and overcurrent threshold values recognition unit provides the identification voltage of different value, just can make control unit determine the overcurrent threshold values of current employing.
After adopting said structure, the utility model compared with prior art has the following advantages: by adopting overcurrent threshold values recognition unit, need not telecommunication circuit and external control system and just can adjust the overcurrent threshold values, structure is greatly simplified, and cost is lower, and is beneficial to the fast and efficient production on the streamline.
As improvement, control unit comprises that model is the MCU of 16F883; Overcurrent threshold values recognition unit comprises first resistance, second resistance, electric capacity, and second resistance is in parallel with electric capacity, and an in parallel common port is electrically connected with an end of first resistance, another common end grounding of parallel connection, and the other end of first resistance is electrically connected with+5V power supply; A common port of described parallel connection also is electrically connected with the input of MCU, like this, by adopting second resistance of different resistances, just can make overcurrent threshold values recognition unit that the reliable and stable identification voltage of different value is provided, structure is more simplified, cost is lower, and is more conducive to the fast and efficient production on the streamline.
Description of drawings
Fig. 1 is the theory diagram of the utility model current foldback circuit.
Fig. 2 is the circuit theory diagrams of the utility model current foldback circuit.
Shown in the figure, 1, overcurrent threshold values recognition unit, 2, MCU.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
The utility model current foldback circuit; it comprises sampling unit, comparing unit, control unit; sampling unit and control unit are electrically connected with comparing unit respectively; it also comprises the overcurrent threshold values recognition unit 1 for output identification voltage; overcurrent threshold values recognition unit 1 is electrically connected with control unit with to control unit output identification voltage, identifies voltage is used for determining current employing for control unit overcurrent threshold values.
Control unit comprises that model is the MCU2 of 16F883, and MCU2 is exactly single-chip microcomputer; Overcurrent threshold values recognition unit 1 comprises first resistance, second resistance, electric capacity, second resistance is in parallel with electric capacity, an in parallel common port is electrically connected with an end of first resistance, another common end grounding of parallel connection, and the other end of first resistance is electrically connected with+5V power supply; A common port of described parallel connection also is electrically connected with the input of MCU2.
Described first resistance, second resistance are fixed resistance, and resistance value is respectively 10 kilohms and 100 kilohms.
1 effect of overcurrent threshold values recognition unit is to provide a stable identification voltage, and physical circuit can be multiple, is not limited to said structure.
A plurality of overcurrent threshold values that control unit is preset with adopt prior art to get final product for default.
Claims (2)
1. current foldback circuit; it comprises sampling unit, comparing unit, control unit; sampling unit and control unit are electrically connected with comparing unit respectively; it is characterized in that; it also comprises the overcurrent threshold values recognition unit (1) for output identification voltage; overcurrent threshold values recognition unit (1) is electrically connected with control unit with to control unit output identification voltage, identifies voltage is used for determining current employing for control unit overcurrent threshold values.
2. current foldback circuit according to claim 1 is characterized in that, control unit comprises that model is the MCU(2 of 16F883); Overcurrent threshold values recognition unit (1) comprises first resistance, second resistance, electric capacity, second resistance is in parallel with electric capacity, an in parallel common port is electrically connected with an end of first resistance, another common end grounding of parallel connection, and the other end of first resistance is electrically connected with+5V power supply; A common port of described parallel connection also with MCU(2) an input be electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320196903 CN203166463U (en) | 2013-04-17 | 2013-04-17 | Over-current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320196903 CN203166463U (en) | 2013-04-17 | 2013-04-17 | Over-current protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166463U true CN203166463U (en) | 2013-08-28 |
Family
ID=49027623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320196903 Expired - Fee Related CN203166463U (en) | 2013-04-17 | 2013-04-17 | Over-current protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203166463U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219694A (en) * | 2013-04-17 | 2013-07-24 | 宁波汉浦工具有限公司 | Over-current protecting circuit |
| CN105591427A (en) * | 2015-11-20 | 2016-05-18 | 芜湖锐芯电子科技有限公司 | Over-current protection module of lithium-ion battery |
-
2013
- 2013-04-17 CN CN 201320196903 patent/CN203166463U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219694A (en) * | 2013-04-17 | 2013-07-24 | 宁波汉浦工具有限公司 | Over-current protecting circuit |
| CN103219694B (en) * | 2013-04-17 | 2015-09-23 | 宁波汉浦工具有限公司 | Current foldback circuit |
| CN105591427A (en) * | 2015-11-20 | 2016-05-18 | 芜湖锐芯电子科技有限公司 | Over-current protection module of lithium-ion battery |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20160417 |