CN202166687U - Overcurrent detecting circuit - Google Patents
Overcurrent detecting circuit Download PDFInfo
- Publication number
- CN202166687U CN202166687U CN2011202128745U CN201120212874U CN202166687U CN 202166687 U CN202166687 U CN 202166687U CN 2011202128745 U CN2011202128745 U CN 2011202128745U CN 201120212874 U CN201120212874 U CN 201120212874U CN 202166687 U CN202166687 U CN 202166687U
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- optocoupler
- connects
- terminals
- light emitting
- emitting diode
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Abstract
The utility model discloses an overcurrent detecting circuit comprising an optocoupler; and a sampling current signal is connected with the cathode of controlled silicon by a second resistor, a first work power supply is connected with the anode of a light emitting diode by a first resistor, the cathode of the light emitting diode is connected with one input end of the optocoupler, and the other input end of the optocoupler is grounded, one output end of the optocoupler is connected with a second work power supply, and the other outoput end of the optocoupler outputs corresponding voltage of the sampling current signal. The overcurrent detecting circuit is simple in structure, is convenient to use, and can be applied on circuits for detecting overcurrent of a motor.
Description
Technical field
The utility model relates to a kind of application circuit, concrete relates to a kind of over-current detection circuit.
Background technology
When circuit is in operate as normal, the electron device operate as normal, but ifs circuit is in over-current state, and will reduce greatly the serviceable life of electron device, so we are necessary whether testing circuit is in over-current state.Existing over-current detection circuit is varied of a great variety; But most complex structure, and adopt the driving circuit of complicated circuit construction to accomplish the function that motor overcurrent detects, 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 is to provide a kind of over-current detection circuit simple in structure.
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 detection circuit; Comprise optocoupler, the sampling current signal connects the silicon controlled negative pole through second resistance, and first working power connects the positive pole of light emitting diode through first resistance; The negative pole of said light emitting diode connects an input end of said optocoupler; Another input end grounding of said optocoupler, an output terminal of said optocoupler connects second working power, and another output terminal of said optocoupler is exported the relevant voltage of said sampling current signal.
Further, variable-resistance center tap and one is pin ground connection fixedly, variable-resistance another fixedly pin connect first terminals, be connected electric capacity between second terminals and the ground, be connected pull-up resistor between the 3rd terminals and the ground.
The course of work of the over-current detection circuit of the utility model is following:
During the motor operate as normal, sampling current is little, and promptly controllable silicon gate leve trigger current is less, and controllable silicon is in the pipeline section state, and light emitting diode lamp is bright, optocoupler conducting, optocoupler output this moment high level.When the electric current of motor is increased to a certain degree (during overcurrent), the voltage that sample resistance takes out makes controllable silicon gate leve triggering and conducting, and the anodal current potential of light emitting diode is dragged down and lamp knocks out, and optocoupler turn-offs, and this moment, the optocoupler output low level supplied single-chip microcomputer to go to judge.
The utlity model has following advantage:
The over-current detection 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 detection 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 detection circuit; Comprise optocoupler, sampling current signal PROTECT is through the negative pole of second resistance R, 2 connection controllable silicon SCR 1, and the first working power V1 connects the positive pole of LED 1 through first resistance R 1; The negative pole of said LED 1 connects the input end of said optocoupler U1; Another input end grounding of said optocoupler, the output terminal of said optocoupler U1 connects second working power, and another output terminal of said optocoupler U1 is exported the relevant voltage of said sampling current signal PROTECT.
Further, the center tap of variable resistor R4 and one is pin ground connection fixedly, and another of variable resistor R4 fixedly pin connects to be connected between first terminals, 1, the second terminals 2 and the ground between capacitor C 1, the three terminals 3 and the ground and be connected pull-up resistor R3.
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 (2)
1. over-current detection circuit; Comprise optocoupler (U1); It is characterized in that: sampling current signal (PROTECT) connects the negative pole of controllable silicon (SCR1) through second resistance (R2); First working power (V1) is through the positive pole of first resistance (R1) connection light emitting diode (LED1), and the negative pole of said light emitting diode (LED1) connects an input end of said optocoupler (U1), another input end grounding of said optocoupler; An output terminal of said optocoupler (U1) connects second working power, and another output terminal of said optocoupler (U1) is exported the relevant voltage of said sampling current signal (PROTECT).
2. according to claims 1 described over-current detection circuit; It is characterized in that: the center tap of variable resistor (R4) and one is pin ground connection fixedly; Another of variable resistor (R4) fixedly pin connects first terminals (1); Be connected electric capacity (C1) between second terminals (2) and the ground, be connected pull-up resistor (R3) between the 3rd terminals (3) and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202128745U CN202166687U (en) | 2011-06-22 | 2011-06-22 | Overcurrent detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202128745U CN202166687U (en) | 2011-06-22 | 2011-06-22 | Overcurrent detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202166687U true CN202166687U (en) | 2012-03-14 |
Family
ID=45802504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202128745U Expired - Fee Related CN202166687U (en) | 2011-06-22 | 2011-06-22 | Overcurrent detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202166687U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995175A (en) * | 2014-06-04 | 2014-08-20 | 安徽江淮汽车股份有限公司 | Over-current detecting circuit |
| CN111929609A (en) * | 2019-04-25 | 2020-11-13 | 株洲中车时代电气股份有限公司 | Short circuit detection device for digital output channel |
-
2011
- 2011-06-22 CN CN2011202128745U patent/CN202166687U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995175A (en) * | 2014-06-04 | 2014-08-20 | 安徽江淮汽车股份有限公司 | Over-current detecting circuit |
| CN111929609A (en) * | 2019-04-25 | 2020-11-13 | 株洲中车时代电气股份有限公司 | Short circuit detection device for digital output channel |
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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: 20120314 Termination date: 20120622 |