CN203596598U - Current foldback circuit of three-phase current - Google Patents
Current foldback circuit of three-phase current Download PDFInfo
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- CN203596598U CN203596598U CN201320707160.0U CN201320707160U CN203596598U CN 203596598 U CN203596598 U CN 203596598U CN 201320707160 U CN201320707160 U CN 201320707160U CN 203596598 U CN203596598 U CN 203596598U
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- arithmetic unit
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- foldback circuit
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Abstract
Provided is a current foldback circuit of a three-phase current. The current foldback circuit comprises an anti-phase summing arithmetic unit. The input end of the anti-phase summing arithmetic unit is connected with a current Ic generation circuit, and the output end is connected with a difference proportion arithmetic unit. The output end of the difference proportion arithmetic unit is connected with a voltage comparator. An absorption capacitor is arranged between the output end of the voltage comparator and the ground. The circuit is advantaged by ingenious design, simple structure and strong practicality.
Description
Technical field
The utility model relates to a kind of overcurrent protective circuit.
Background technology
There are at present a lot of overcurrent protective circuits: the employing control chip design circuit having, function is stronger, but cost is higher; Some employing discrete component design circuits, circuit is simple, and cost is low, but control precision is not high, and function is few.The design adopts the ingenious computing of current transformer and integrated transporting discharging to realize three-phase current overcurrent protection function.
Summary of the invention
The purpose of this utility model is to provide the simple three-phase current current foldback circuit of a kind of circuit structure.
For achieving the above object, the utility model is by the following technical solutions:
A kind of three-phase current current foldback circuit, it comprises anti-phase summation operation device, and the input of anti-phase summation operation device connects electric current I c generative circuit, and its output connects difference ratio arithmetic unit, and the output of difference ratio arithmetic unit connects voltage comparator.
Between the output of described voltage comparator and ground, Absorption Capacitance is set.
The utility model that adopts technique scheme, circuit design is ingenious, and circuit structure is simple, practical.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
As shown in Figure 1; a kind of three-phase current current foldback circuit; it comprises anti-phase summation operation device U28C; the input of anti-phase summation operation device U28C connects electric current I c generative circuit; its output connects difference ratio arithmetic unit U28D, and the output of difference ratio arithmetic unit U28D connects voltage comparator U29A.
Between the output of voltage comparator U29A and ground, Absorption Capacitance C109 is set.
Operation principle of the present utility model is: this circuit is processed and generated IC electric current through oversampling circuit after gathering IA, two electric currents of IB.Main circuit will be made up of anti-phase summation operation device U28C, difference ratio arithmetic unit U28D and voltage comparator U29A.Major function is that three-phase current is carried out after three phase full bridge rectification through voltage ratio, can determining whether overcurrent determines whether interrupting the bus current flowing through.
Claims (2)
1. a three-phase current current foldback circuit; it is characterized in that: it comprises anti-phase summation operation device (U28C); the input of anti-phase summation operation device (U28C) connects electric current I c generative circuit; its output connects difference ratio arithmetic unit (U28D), and the output of difference ratio arithmetic unit (U28D) connects voltage comparator (U29A).
2. three-phase current current foldback circuit according to claim 1, is characterized in that: between the output of described voltage comparator (U29A) and ground, Absorption Capacitance (C109) is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320707160.0U CN203596598U (en) | 2013-11-11 | 2013-11-11 | Current foldback circuit of three-phase current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320707160.0U CN203596598U (en) | 2013-11-11 | 2013-11-11 | Current foldback circuit of three-phase current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203596598U true CN203596598U (en) | 2014-05-14 |
Family
ID=50677456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320707160.0U Expired - Fee Related CN203596598U (en) | 2013-11-11 | 2013-11-11 | Current foldback circuit of three-phase current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203596598U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722127A (en) * | 2020-05-07 | 2020-09-29 | 武汉市蓝电电子股份有限公司 | Reverse connection prevention protection circuit for current line of battery test equipment |
-
2013
- 2013-11-11 CN CN201320707160.0U patent/CN203596598U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722127A (en) * | 2020-05-07 | 2020-09-29 | 武汉市蓝电电子股份有限公司 | Reverse connection prevention protection circuit for current line of battery test equipment |
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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: 20140514 Termination date: 20141111 |
|
| EXPY | Termination of patent right or utility model |