CN202153237U - Motor over-current detection circuit - Google Patents
Motor over-current detection circuit Download PDFInfo
- Publication number
- CN202153237U CN202153237U CN2011202128726U CN201120212872U CN202153237U CN 202153237 U CN202153237 U CN 202153237U CN 2011202128726 U CN2011202128726 U CN 2011202128726U CN 201120212872 U CN201120212872 U CN 201120212872U CN 202153237 U CN202153237 U CN 202153237U
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- CN
- China
- Prior art keywords
- operational amplifier
- resistance
- input end
- ground
- optocoupler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The present utility model discloses a motor over-current detection circuit. The circuit is composed of a fourth operational amplifier, a single comparator and an optical coupler, sampling voltage signals are connected with a non-inverting input end of the fourth operational amplifier after passing through a third resistor and a forth resistor successively, an inverting input end of the fourth operational amplifier is connected with the ground after passing through a sixth resistor, an output end of the fourth operational amplifier is connected with a non-inverting input end of the single comparator, after the voltage of a third working power supply is divided by a eighth resistor and a ninth resistor, a fixed electrical level is obtained, the fixed electrical level is connected with an inverting input end of the single comparator, an output end of the single comparator is connected with one input end of the optical coupler, the other input end of the optical coupler is connected with the ground, one output end of the optical coupler is used for outputting corresponding voltage, and the other output end of the optical coupler is connected with the ground. The circuit is simple in structure and convenient in use. Moreover, the circuit can be used in the situation of motor over-current detection.
Description
Technical field
The utility model relates to a kind of application circuit, concrete relates to a kind of over current of motor testing circuit.
Background technology
The prior motor over-current detection circuit is varied of a great variety; But complex structure, difficult adjustment and response speed are slow mostly, and adopt the driving circuit of complicated circuit construction to accomplish the function that motor overcurrent detects, and cost can increase so on the one hand; In addition on the one hand; After circuit structure was in a single day complicated, its labile factor was behind so just reducing product percent of pass virtually also increasing.
The utility model content
For overcoming deficiency of the prior art, the purpose of the utility model be to provide a kind of simple in structure, protection is proper and the over current of motor testing circuit of easy realization.
In order to solve the problems of the technologies described above, realize above-mentioned purpose, the utility model has adopted following technical scheme:
A kind of over current of motor testing circuit; Comprise four-operational amplifier, single comparer and optocoupler; The sampling voltage signal connects the in-phase input end of said four-operational amplifier successively through the 3rd resistance, the 4th resistance; The inverting input of said four-operational amplifier is through the 6th resistance eutral grounding; The output terminal of said four-operational amplifier connects the in-phase input end of said single comparer, and the 3rd working power obtains fixed level through the 8th resistance, the 9th electric resistance partial pressure, and said fixed level is connected to the inverting input of said single comparer; The output terminal of said single comparer connects an input end of said optocoupler, another input end grounding of said optocoupler, an output terminal output relevant voltage of said optocoupler, another output head grounding of said optocoupler.
Further; Be connected first electric capacity between first terminals and the ground; The output terminal of said four-operational amplifier connects the inverting input of said four-operational amplifier through feedback resistance; Reversal connection second diode between the inverting input of said four-operational amplifier and the ground; Reversal connection first diode between the in-phase input end of said four-operational amplifier and the ground is connected first resistance and the 5th resistance between the in-phase input end of first working power and said four-operational amplifier, is connected first resistance and second resistance between said first working power and the ground.
Further, be connected the tenth resistance between the output terminal of said single comparer and the 3rd terminals, be connected pull-up resistor between output terminal of said optocoupler and second terminals.
Further, be connected the 3rd electric capacity between the 3rd terminals and the ground, be connected second electric capacity between the 4th terminals and the ground.
The course of work of the over current of motor testing circuit of the utility model is following:
After the sampling voltage signal amplifies through said four-operational amplifier; The output terminal output relevant voltage of said four-operational amplifier; The output voltage of said four-operational amplifier and threshold level compare through said single comparer; Through said optocoupler, in case the said optocoupler of motor overcurrent can overturn, the motor said optocoupler of overcurrent once more also can recover the output signal of said single comparer again.
The utlity model has following advantage:
The over current of motor testing circuit of the utility model simple in structure, easy to use.
Above-mentioned explanation only is the general introduction of the utility model technical scheme, in order more to know the technological means of understanding the utility model, and can implement according to the content of instructions, below with the preferred embodiment of the utility model and conjunction with figs. specify as after.The embodiment of the utility model is provided by following examples and accompanying drawing thereof in detail.
Description of drawings
Fig. 1 is the circuit theory diagrams of the over current of motor testing circuit of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the technology implementation process of the utility model is further specified.
Referring to shown in Figure 1; A kind of over current of motor testing circuit; Comprise four-operational amplifier IC1, single comparer IC2 and optocoupler U1; Sampling voltage signal PROTECT connects the in-phase input end of said four-operational amplifier IC1 successively through the 3rd resistance R 3, the 4th resistance R 4, the inverting input of said four-operational amplifier IC1 is through the 6th resistance R 6 ground connection, and the output terminal of said four-operational amplifier IC1 connects the in-phase input end of said single comparer IC2; The 3rd working power V3 obtains fixed level V4 through the 8th resistance R 8, the 9th resistance R 9 dividing potential drops, and said fixed level V4 is connected to the inverting input of said single comparer IC2; The output terminal of said single comparer IC2 connects the input end of said optocoupler U1, another input end grounding of said optocoupler U1, the output terminal output relevant voltage of said optocoupler U1, another output head grounding of said optocoupler U1.
Further; Be connected first capacitor C 1 between first terminals 1 and the ground; The output terminal of said four-operational amplifier IC1 connects the inverting input of said four-operational amplifier IC1 through feedback resistance R7; The reversal connection second diode D2 between the inverting input of said four-operational amplifier IC1 and the ground; The reversal connection first diode D1 between the in-phase input end of said four-operational amplifier IC1 and the ground is connected first resistance R 1 and the 5th resistance R 5 between the in-phase input end of the first working power V1 and said four-operational amplifier IC1, is connected first resistance R 1 and second resistance R 2 between the said first working power V1 and the ground.
Further, be connected the tenth resistance R 10 between the output terminal of said single comparer IC2 and the 3rd terminals 3, be connected pull-up resistor R11 between output terminal of said optocoupler U1 and second terminals 2.
Further, be connected between the 3rd terminals 3 and the ground between the 3rd capacitor C 3, the four terminals 4 and the ground and be connected second capacitor C 2.
The foregoing description is technical conceive and the characteristics for the utility model is described just, its objective is to be the content that lets the one of ordinary skilled in the art can understand the utility model and to implement according to this, can not limit the protection domain of the utility model with this.The variation or the modification of every equivalence of having done according to the essence of the utility model content all should be encompassed in the protection domain of the utility model.
Claims (4)
1. over current of motor testing circuit; Comprise four-operational amplifier (IC1), single comparer (IC2) and optocoupler (U1); It is characterized in that: sampling voltage signal (PROTECT) connects the in-phase input end of said four-operational amplifier (IC1) successively through the 3rd resistance (R3), the 4th resistance (R4); The inverting input of said four-operational amplifier (IC1) is through the 6th resistance (R6) ground connection; The output terminal of said four-operational amplifier (IC1) connects the in-phase input end of said single comparer (IC2); The 3rd working power (V3) obtains fixed level (V4) through the 8th resistance (R8), the 9th resistance (R9) dividing potential drop, and said fixed level (V4) is connected to the inverting input of said single comparer (IC2); The output terminal of said single comparer (IC2) connects an input end of said optocoupler (U1), another input end grounding of said optocoupler (U1), an output terminal output relevant voltage of said optocoupler (U1), another output head grounding of said optocoupler (U1).
2. according to claims 1 described over current of motor testing circuit; It is characterized in that: be connected first electric capacity (C1) between first terminals (1) and the ground; The output terminal of said four-operational amplifier (IC1) connects the inverting input of said four-operational amplifier (IC1) through feedback resistance (R7); Reversal connection second diode (D2) between the inverting input of said four-operational amplifier (IC1) and the ground; Reversal connection first diode (D1) between the in-phase input end of said four-operational amplifier (IC1) and the ground; Be connected first resistance (R1) and the 5th resistance (R5) between the in-phase input end of first working power (V1) and said four-operational amplifier (IC1), be connected first resistance (R1) and second resistance (R2) between said first working power (V1) and the ground.
3. according to claims 1 described over current of motor testing circuit; It is characterized in that: be connected the tenth resistance (R10) between the output terminal of said single comparer (IC2) and the 3rd terminals (3), be connected pull-up resistor (R11) between output terminal of said optocoupler (U1) and second terminals (2).
4. according to claims 1 described over current of motor testing circuit, it is characterized in that: be connected the 3rd electric capacity (C3) between the 3rd terminals (3) and the ground, be connected second electric capacity (C2) between the 4th terminals (4) and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202128726U CN202153237U (en) | 2011-06-22 | 2011-06-22 | Motor over-current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202128726U CN202153237U (en) | 2011-06-22 | 2011-06-22 | Motor over-current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202153237U true CN202153237U (en) | 2012-02-29 |
Family
ID=45693732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202128726U Expired - Fee Related CN202153237U (en) | 2011-06-22 | 2011-06-22 | Motor over-current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202153237U (en) |
-
2011
- 2011-06-22 CN CN2011202128726U patent/CN202153237U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120229 Termination date: 20120622 |