CN201965169U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN201965169U CN201965169U CN2010206821184U CN201020682118U CN201965169U CN 201965169 U CN201965169 U CN 201965169U CN 2010206821184 U CN2010206821184 U CN 2010206821184U CN 201020682118 U CN201020682118 U CN 201020682118U CN 201965169 U CN201965169 U CN 201965169U
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Abstract
A current detection circuit is including resistance R1, R2, integrated circuit U1, U2 electric capacity C1-C3, CAP1. U1 is AD8205. U2 is REF3033. The direct current measuring has been realized to this utility model, and can realize the design (high terminal voltage can reach 65V) of the high-end compatibility of low side, and 0 to 3.3V of output DC voltage, which can directly deliver to the MCU system that can supply 3.3V power. And through AD conversion, the reading of AD can realize electric current. The precision of this utility model electric current detection is high and the scope is wide. Components and parts are small in quantity and the non- isolation of high-low pressure is compatible good.
Description
Technical field
The utility model relates to power technique fields, particularly relates to a kind of current detection circuit.
Background technology
Current detection circuit is commonly used to detect output end current, compare with reference current again after detecting, import high (low) level afterwards, and it is fed back to control end, current/voltage or the like with the control input circuit, in Switching Power Supply, feed back to certain chip usually, again by this chip controls switching tube.
The utility model content
The purpose of this utility model is to avoid weak point of the prior art and current detection circuit that a kind of simple and stable is provided.
The purpose of this utility model realizes by following technical measures:
A kind of current detection circuit, comprise resistance R 1, R2, integrated circuit U1, U2 capacitor C 1-C3, CAP1, the two ends of R1 are connected to Vin+ and the Vin-of U1, the GND of U1 and Ref2 are connected in the end of C3, the positive pole of U2, the end of C2, the negative pole of CAP1, an end and the ground connection of C1, the Ref1 of another termination U1 of C3, the adjustable side of U2, the V+ of U1 is connected in the negative pole of D5V, U2, the other end of C2 and the positive pole of CAP1, the Vout of U1 is connected in the end of R2, and the other end of R2 is connected in the other end of CPU_ISEN and C1.
U1 is AD8205.
U2 is REF3033.
The utility model has been realized direct current detection, and can realize the design (high terminal voltage can reach 65V) of the high-end compatibility of low side, output dc voltage 0～3.3V, can directly deliver to the MCU system of 3.3V power supply, read the utility model current detection accuracy height by what the AD conversion realized electric current, wide ranges, component number is few, and the non-isolation of high-low pressure is compatible good, detects range of current adjustable (regulate maximum by adjusting sampling resistor R1 resistance and can check range of current).
Description of drawings
Utilize accompanying drawing that the utility model is described further, but the content in the accompanying drawing does not constitute any restriction of the present utility model.
Fig. 1 is the circuit diagram of an embodiment of current detection circuit of the present utility model.
Embodiment
The utility model is described in further detail with the following Examples.
An embodiment of current detection circuit of the present utility model as shown in Figure 1, comprise resistance R 1, R2, integrated circuit U1, U2 capacitor C 1-C3, CAP1, the two ends of R1 are connected to Vin+ and the Vin-of U1, the GND of U1 and Ref2 are connected in the end of C3, the positive pole of U2, the end of C2, the negative pole of CAP1, an end and the ground connection of C1, the Ref1 of another termination U1 of C3, the adjustable side of U2, the V+ of U1 is connected in D5V, the negative pole of U2, the other end of C2 and the positive pole of CAP1, the Vout of U1 is connected in the end of R2, and the other end of R2 is connected in the other end of CPU_ISEN and C1.U1 is AD8205.U2 is REF3033.
This circuit has been realized direct current detection, and can realize the design (high terminal voltage can reach 65V) of the high-end compatibility of low side, and output dc voltage 0～3.3V can directly deliver to the MCU system that 3.3V powers, and realizes reading of electric current by the AD conversion.This blocks current accuracy of detection height, wide ranges, component number is few, and the non-isolation of high-low pressure is compatible good, and maximum current that scalable detects.
When current flowing resistance R1, can produce a pressure reduction at the R1 two ends, this differential signal is delivered to the input end of AD8205, directly export the voltage signal of 0～3.3V, can realize the detection of electric current through the AD mouth of delivering to MCU after the simple RC wave filter.If MCU is the 5V system, then only need No. 7 pins are connected to the output that D5V can realize exporting 5V.The enlargement factor of AD8205 is 50 times of fixed values, when needs are adjusted maximum detection current value, only needs to revise the R1 value and can adjust the current detecting scope.
Should be noted that at last; above embodiment only is used to the technical solution of the utility model is described but not to the restriction of the utility model protection domain; although the utility model has been done detailed description with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the essence and the scope of technical solutions of the utility model.
Claims (3)
1. current detection circuit, it is characterized in that: comprise resistance R 1, R2, integrated circuit U1, U2 capacitor C 1-C3, CAP1, the two ends of R1 are connected to Vin+ and the Vin-of U1, the GND of U1 and Ref2 are connected in the end of C3, the positive pole of U2, the end of C2, the negative pole of CAP1, an end and the ground connection of C1, the Ref1 of another termination U1 of C3, the adjustable side of U2, the V+ of U1 is connected in the negative pole of D5V, U2, the other end of C2 and the positive pole of CAP1, the Vout of U1 is connected in the end of R2, and the other end of R2 is connected in the other end of CPU_ISEN and C1.
2. current detection circuit according to claim 1 is characterized in that: U1 is AD8205.
3. current detection circuit according to claim 1 is characterized in that: U2 is REF3033.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206821184U CN201965169U (en) | 2010-12-27 | 2010-12-27 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206821184U CN201965169U (en) | 2010-12-27 | 2010-12-27 | Current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201965169U true CN201965169U (en) | 2011-09-07 |
Family
ID=44527715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206821184U Expired - Fee Related CN201965169U (en) | 2010-12-27 | 2010-12-27 | Current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201965169U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012453A (en) * | 2010-12-27 | 2011-04-13 | 东莞易步机器人有限公司 | Current detection circuit |
-
2010
- 2010-12-27 CN CN2010206821184U patent/CN201965169U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012453A (en) * | 2010-12-27 | 2011-04-13 | 东莞易步机器人有限公司 | Current detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: DONGGUAN LEGAN INTELLIGENT TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: DONGGUAN ROBSTEP ROBOT CO., LTD. Effective date: 20120308 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120308 Address after: 523808 room 1, R & D building, nine hi tech Industrial Zone, Songshan Lake hi tech Industrial Development Zone, Guangdong, Dongguan, 114 Patentee after: Dongguan Yibu Robot Co., Ltd. Address before: 523808, room 1, R & D building, Songshan Road, nine, science and Technology Industrial Park, Songshan, Dongguan, Guangdong 110, China Patentee before: Dongguan Robstep Robot Co., Ltd. |
|
| 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: 20110907 Termination date: 20171227 |