CN206272215U - A kind of overload protecting circuit - Google Patents
A kind of overload protecting circuit Download PDFInfo
- Publication number
- CN206272215U CN206272215U CN201621426394.8U CN201621426394U CN206272215U CN 206272215 U CN206272215 U CN 206272215U CN 201621426394 U CN201621426394 U CN 201621426394U CN 206272215 U CN206272215 U CN 206272215U
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- mcu
- semiconductor
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- metal
- protecting circuit
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Abstract
The utility model discloses a kind of overload protecting circuit, the circuit includes MCU, motor, thermistor R1, divider resistance R2 and metal-oxide-semiconductor Q1, the voltage input end of MCU and one end of divider resistance R2 are respectively connected with a constant voltage, the one end of the test side of MCU and the other end of divider resistance R2 with thermistor R1 is connected, the other end of thermistor R1 is connected with the negative electrode of external power source, first control end of MCU is connected with the grid of metal-oxide-semiconductor, one end of motor is connected with the positive pole of external power source, the other end of motor is connected with the drain electrode of metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor is connected with the negative pole of external power source, the negative pole ground connection of external power source, thermistor R1 is arranged near metal-oxide-semiconductor Q1.Low manufacture cost of the present utility model, simple structure, have a safety feature and strong applicability.
Description
Technical field
The utility model is related to circuit field, more particularly to a kind of overload protecting circuit.
Background technology
In dust catcher industry, generally require to carry out rotation-clogging protection to aspiration motor, especially when there is thing to block motor
Or because motor reason is blocked in itself when, the electric current of whole operating circuit will be more much larger than normal operating current, if now
Power supply is not closed, the electric elements in operating circuit will be caused and damaged because of overload, cause the system of whole dust catcher not
Can run again.And existing rotation-clogging protection is that the detection based on the electric current to operating circuit is completed at present, but electric current
Detection generally requires special detection resistance and change-over circuit, and not only cost of manufacture is high for such scheme, and needs space larger
Pcb board.
The content of the invention
In view of this, the technical problems to be solved in the utility model is to provide a kind of low manufacture cost, simple structure, safety
Performance is good and overload protecting circuit of strong applicability.
In order to solve the above-mentioned technical problem, the utility model is realized using following scheme：
A kind of overload protecting circuit, including MCU, motor, thermistor R1, divider resistance R2 and metal-oxide-semiconductor Q1, MCU's
One end of voltage input end and divider resistance R2 are respectively connected with a constant voltage, the test side of MCU and divider resistance R2's
The one end of the other end with thermistor R1 is connected, and the other end of thermistor R1 is connected with the negative electrode of external power source, MCU's
First control end is connected with the grid of metal-oxide-semiconductor, and one end of motor is connected with the positive pole of external power source, the other end and MOS of motor
The drain electrode of pipe is connected, and the source electrode of metal-oxide-semiconductor is connected with the negative pole of external power source, and the negative pole ground connection of external power source, thermistor R1 is leaned on
Nearly metal-oxide-semiconductor Q1 is arranged.
Preferably, the overload protecting circuit also includes the second control end of an alarm unit, the alarm unit and MCU
It is electrical connected.
Preferably, the alarm unit is buzzer and/or LED light.
Preferably, the overload protecting circuit also includes a power management chip U1, and the voltage of power management chip U1 is defeated
Enter end to be connected with the positive pole of external power source, the voltage output end of power management chip is electric with the voltage input end of MCU and partial pressure
The one end for hindering R2 is connected, and a constant voltage is provided with one end of the voltage input end for MCU and divider resistance R2.
Preferably, the model MAX1800 of the power management chip.
Compared with prior art, the utility model has the following advantages that：
The simple structure of the overload protecting circuit, and low manufacture cost, it can in time break when operating circuit overloads
Operating circuit is driven, the damage of the electric elements in operating circuit is prevented, possesses good security performance and wide applicability.
Brief description of the drawings
In order to illustrate more clearly of the utility model operation logic and the technical scheme for using, below will to operation logic and
The accompanying drawing to be used needed for the technology for using is briefly described.It is clear that drawings in the following description are only this reality
Example is run with some new, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram of overload protecting circuit of the present utility model.
Specific embodiment
In order to allow those skilled in the art to more fully understand the technical solution of the utility model, below in conjunction with the accompanying drawings to this
Utility model is further elaborated.
Such as Fig. 1, a kind of overload protecting circuit, including MCU, motor M, thermistor R1, divider resistance R2 and metal-oxide-semiconductor
The voltage input end 1 of Q1, MCU and one end of divider resistance R2 are respectively connected with a constant voltage, the test side 2 of MCU and point
The one end of the other end of piezoresistance R2 with thermistor R1 is connected, the other end of thermistor R1 and the negative electrode of external power source
J2 is connected, and first control end 3 of MCU is connected with the grid G of metal-oxide-semiconductor, and one end of motor M is connected with the positive pole J1 of external power source,
The other end of motor M is connected with the drain D of metal-oxide-semiconductor, and the source electrode G of metal-oxide-semiconductor is connected with the negative pole J2 of external power source, external power source
Negative pole J2 is grounded, and thermistor R1 is arranged near metal-oxide-semiconductor Q1.
Wherein, when the arrangement of electric elements of circuit is operated, it is necessary to thermistor R1 is positioned as close into MOS
Pipe Q1 arranges.Metal-oxide-semiconductor Q1's itself carries internal resistance, when an electric current passes through it, can produce certain heat, when normally working,
Its heat for producing can all disperse, but when the electric current of circuit is raised to a certain extent, the heat that metal-oxide-semiconductor Q1 is produced will be remote
The remote heat that can be dispersed more than it, now the temperature of metal-oxide-semiconductor Q1 will continue to rise, now thermistor R1 can just feel
The change of temperature should be arrived, so as to change its own resistance, the resistance variations that the test side of MCU detects thermistor R1 reach one
When determining degree, that is, metal-oxide-semiconductor Q1 is controlled to disconnect, so that operating circuit no longer works, in order to remind user to work
Especially motor is checked circuit accordingly.
Its specific operation principle is as follows：When motor is stuck, the electric current meeting of the overload protecting circuit in the present embodiment
Correspondingly increase, now the temperature of metal-oxide-semiconductor Q1 can be raised with the increase of electric current, and influence the resistance of thermistor R1 to occur
Change.Thermistor R1 and divider resistance R2 is series relationship again, and one end of divider resistance R2 is connected with a constant voltage, works as heat
When the resistance of quick resistance R1 changes, also there is corresponding change in the voltage at its two ends, if the test side 2 of MCU detects heat
When the voltage of quick resistance R1 occurs corresponding change more than default scope, then first control end 3 of MCU can then control MOS
Pipe Q1 disconnects, and so as to other electrical equipments for avoiding motor or operating circuit are damaged because of excessively stream, improves security performance.
Preferably, the overload protecting circuit also includes the second control end of an alarm unit, the alarm unit and MCU
4 are electrical connected.When there is corresponding change in the voltage that the test side 2 of MCU detects thermistor R1 exceed default scope,
Second control end 4 of MCU can also control the alarm unit to send alarm.Wherein, the alarm unit can be buzzer,
LED light is can also be, i.e. alarm can carry out inspection finishing by buzzer generation buzzing prompting user, can also pass through
The shinny prompting user of LED light carries out inspection finishing so that user is more convenient and practical in use.Certainly, report
Alert unit can also be that others can remind the unit of user.
As it is further preferred that the overload protecting circuit also includes a power management chip U1, power management chip
The voltage input end 1 of U1 is connected with the positive pole J1 of external power source, and the voltage output end 2 of power management chip is defeated with the voltage of MCU
The one end for entering 1 and divider resistance R2 of end is connected, and one is provided with the voltage input end 1 for MCU and one end of divider resistance R2
Constant voltage.The model of the power management chip can be MAX1800, and certainly, power management chip can also be other
Chip of the constant voltage as operating voltage can be provided for MCU.The setting of power management chip causes whole overload protection electricity
Road is more perfect, and applicability is more preferable.
Above-described embodiment is only wherein specific implementation of the present utility model, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the utility model the scope of the claims can not be interpreted as.It should be pointed out that for the ordinary skill of this area
For personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are apparent
Alternative forms belong to protection domain of the present utility model.
Claims (5)
1. a kind of overload protecting circuit, it is characterised in that including MCU, motor, thermistor R1, divider resistance R2 and metal-oxide-semiconductor
The voltage input end of Q1, MCU and one end of divider resistance R2 are respectively connected with a constant voltage, the test side of MCU and partial pressure
The one end of the other end of resistance R2 with thermistor R1 is connected, the other end of thermistor R1 and the negative electrode phase of external power source
Even, first control end of MCU is connected with the grid of metal-oxide-semiconductor, and one end of motor is connected with the positive pole of external power source, motor it is another
End is connected with the drain electrode of metal-oxide-semiconductor, and the source electrode of metal-oxide-semiconductor is connected with the negative pole of external power source, the negative pole ground connection of external power source, temperature-sensitive electricity
Resistance R1 is arranged near metal-oxide-semiconductor Q1.
2. overload protecting circuit as claimed in claim 1, it is characterised in that the overload protecting circuit also includes that an alarm is single
Unit, the alarm unit is electrical connected with second control end of MCU.
3. overload protecting circuit as claimed in claim 2, it is characterised in that the alarm unit is that buzzer and/or LED refer to
Show lamp.
4. overload protecting circuit as claimed in claim 1, it is characterised in that the overload protecting circuit also includes a power supply pipe
Reason chip U1, the voltage input end of power management chip U1 is connected with the positive pole of external power source, and the voltage of power management chip is defeated
Go out end to be connected with the voltage input end of MCU and one end of divider resistance R2, think the voltage input end and divider resistance of MCU
One end of R2 provides a constant voltage.
5. overload protecting circuit as claimed in claim 4, it is characterised in that the model of the power management chip
MAX1800。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621426394.8U CN206272215U (en) | 2016-12-23 | 2016-12-23 | A kind of overload protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621426394.8U CN206272215U (en) | 2016-12-23 | 2016-12-23 | A kind of overload protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206272215U true CN206272215U (en) | 2017-06-20 |
Family
ID=59047928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621426394.8U Active CN206272215U (en) | 2016-12-23 | 2016-12-23 | A kind of overload protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206272215U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327012A (en) * | 2018-09-21 | 2019-02-12 | 郑州云海信息技术有限公司 | A kind of the protection circuit and server of mainboard |
-
2016
- 2016-12-23 CN CN201621426394.8U patent/CN206272215U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327012A (en) * | 2018-09-21 | 2019-02-12 | 郑州云海信息技术有限公司 | A kind of the protection circuit and server of mainboard |
| CN109327012B (en) * | 2018-09-21 | 2020-03-31 | 郑州云海信息技术有限公司 | Protection circuit and server of mainboard |
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