CN209104791U - A kind of motor overcurrent protection circuit - Google Patents
A kind of motor overcurrent protection circuit Download PDFInfo
- Publication number
- CN209104791U CN209104791U CN201822152589.3U CN201822152589U CN209104791U CN 209104791 U CN209104791 U CN 209104791U CN 201822152589 U CN201822152589 U CN 201822152589U CN 209104791 U CN209104791 U CN 209104791U
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- resistance
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- utility
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- Protection Of Generators And Motors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of motor overcurrent protection circuits, including amplifier U9, voltage-stablizer ZD1, resistance R27, resistance R28, resistance R31, resistance R32, resistance R37, capacitor C27, capacitor C28, capacitor C30, capacitor C31 and capacitor C32；One end of the normal phase input end connection resistance R28 of amplifier U9, the other end of resistance R28 is separately connected one end of one end of resistance R27, capacitor C27, the other end of capacitor C27 connects one end of resistance R32 and ground connection, the other end of resistance R32 be separately connected the inverting input terminal of amplifier U9, one end of resistance R37, capacitor C32 one end, resistance R37 the other end connection amplifier U9 output end.The utility model circuit structure is simple, and the over-current detection time is short, and response is fast, high reliablity, and it is convenient to realize, can be well protected motor, is widely used.
Description
Technical field
The utility model relates to technical field of circuit design, and in particular to a kind of motor overcurrent protection circuit.
Background technique
Many electronic equipments have a rated current, do not allow more than rated current, not so can burn out equipment.So some
Equipment has just done overcurrent protection module.When electric current is more than setting electric current, equipment is automatically powered off, to protect equipment.
Present motor generally uses three-phase electricity, complicated, the matched current foldback circuit due to electric current than two-phase electricity
That designs is increasingly complex, reduces the efficiency of motor overcurrent protection circuit.
The most common damage type of motor is overcurrent damage, therefore carries out reliable overcurrent protection for protection electricity to motor
Machine trouble free service is particularly important.Overcurrent protection measure at present is: current sensor acquires motor input current, collected electric current
It is sent to MCU after handling by operational amplifier, overcurrent protection is judged whether by software；And AD conversion and MCU processing all need
Longer time is waited, keeps the over-current detection time longer, protection circuit response time is long；Simultaneously as motor booting operation
In switching tube handoff procedure, there are peak currents, in order not to cause overcurrent to judge by accident, generally use the ripple for improving filter circuit
Absorbability filters out peak current, or the overcurrent threshold value of comparator is increased, but the above method can all cause
Flow the longer problem of detection time.
Utility model content
In view of this, the utility model proposes a kind of protections of over current of motor in order to solve the above problem in the prior art
Circuit.
The utility model is solved the above problems by following technological means:
A kind of motor overcurrent protection circuit, including amplifier U9, voltage-stablizer ZD1, resistance R27, resistance R28, resistance R31,
Resistance R32, resistance R37, capacitor C27, capacitor C28, capacitor C30, capacitor C31 and capacitor C32；
The positive power source terminal of amplifier U9 connects power supply 5V, and the negative power end of amplifier U9 is grounded, and the positive of amplifier U9 is defeated
Enter one end of end connection resistance R28, the other end of resistance R28 is separately connected one end of one end of resistance R27, capacitor C27, capacitor
The other end of C27 connects one end of resistance R32 and ground connection, the other end of resistance R32 are separately connected the anti-phase input of amplifier U9
End, one end of resistance R37, capacitor C32 one end, resistance R37 the other end connection amplifier U9 output end, capacitor C32's
The other end connects the output end of amplifier U9, one end of the output end connection resistance R31 of amplifier U9, the other end of resistance R31
It is separately connected the cathode of voltage-stablizer ZD1, one end of capacitor C28, the anode of the other end connection voltage-stablizer ZD1 of capacitor C28, pressure stabilizing
The plus earth of device ZD1, one end of one end connection capacitor C31 of capacitor C30, one end of capacitor C31 connects power supply 5V, capacitor
The other end and ground connection, the other end of resistance R27 of the other end connection capacitor C31 of C30 is detection current terminal.
Further, the model LMV321 of the amplifier U9.
Compared with prior art, the beneficial effects of the utility model include at least:
The utility model circuit structure is simple, and the over-current detection time is short, and response is fast, high reliablity, and it is convenient to realize, can be very well
Protection motor, be widely used.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the circuit diagram of the utility model motor overcurrent protection circuit.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, below in conjunction with attached drawing and
The technical solution of the utility model is described in detail in specific embodiment.It should be pointed out that described embodiment is only
It is only the utility model a part of the embodiment, instead of all the embodiments, based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without making creative work, belongs to the utility model
The range of protection.
Embodiment
As shown in Figure 1, the utility model discloses a kind of motor overcurrent protection circuit, including amplifier U9, voltage-stablizer
ZD1, resistance R27, resistance R28, resistance R31, resistance R32, resistance R37, capacitor C27, capacitor C28, capacitor C30, capacitor C31 and
Capacitor C32；
The positive power source terminal of amplifier U9 connects power supply 5V, and the negative power end of amplifier U9 is grounded, and the positive of amplifier U9 is defeated
Enter one end of end connection resistance R28, the other end of resistance R28 is separately connected one end of one end of resistance R27, capacitor C27, capacitor
The other end of C27 connects one end of resistance R32 and ground connection, the other end of resistance R32 are separately connected the anti-phase input of amplifier U9
End, one end of resistance R37, capacitor C32 one end, resistance R37 the other end connection amplifier U9 output end, capacitor C32's
The other end connects the output end of amplifier U9, one end of the output end connection resistance R31 of amplifier U9, the other end of resistance R31
It is separately connected the cathode of voltage-stablizer ZD1, one end of capacitor C28, the anode of the other end connection voltage-stablizer ZD1 of capacitor C28, pressure stabilizing
The plus earth of device ZD1, one end of one end connection capacitor C31 of capacitor C30, one end of capacitor C31 connects power supply 5V, capacitor
The other end and ground connection, the other end of resistance R27 of the other end connection capacitor C31 of C30 is detection current terminal.
Specifically, the model LMV321 of the amplifier U9.
Current sampling signal passes through 21 times of amplification in the same direction, then carries out RC filtering, obtains smooth direct current signal, then pass through
The clamper protection for crossing 5.1V zener diode, is sent to MCU and is handled.
When the operating current data exception of motor, which is exactly to start, and MCU can close PWM letter
Number, the protection to motor is completed, extends the service life of motor, keeps the working environment of staff safer.
Compared with prior art, the beneficial effects of the utility model include at least:
The utility model circuit structure is simple, and the over-current detection time is short, and response is fast, high reliablity, and it is convenient to realize, can be very well
Protection motor, be widely used.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (2)
1. a kind of motor overcurrent protection circuit, which is characterized in that including amplifier U9, voltage-stablizer ZD1, resistance R27, resistance R28,
Resistance R31, resistance R32, resistance R37, capacitor C27, capacitor C28, capacitor C30, capacitor C31 and capacitor C32；
The positive power source terminal of amplifier U9 connects power supply 5V, the negative power end ground connection of amplifier U9, the normal phase input end of amplifier U9
One end of resistance R28 is connected, the other end of resistance R28 is separately connected one end of one end of resistance R27, capacitor C27, capacitor C27
The other end connection resistance R32 one end and ground connection, the other end of resistance R32 be separately connected amplifier U9 inverting input terminal,
One end of resistance R37, capacitor C32 one end, the output end of the other end connection amplifier U9 of resistance R37, capacitor C32's is another
The output end of end connection amplifier U9, one end of the output end connection resistance R31 of amplifier U9, the other end difference of resistance R31
Connect the cathode of voltage-stablizer ZD1, one end of capacitor C28, the anode of the other end connection voltage-stablizer ZD1 of capacitor C28, voltage-stablizer
The plus earth of ZD1, one end of one end connection capacitor C31 of capacitor C30, one end of capacitor C31 connects power supply 5V, capacitor C30
Other end connection capacitor C31 the other end and ground connection, the other end of resistance R27 be detection current terminal.
2. motor overcurrent protection circuit according to claim 1, which is characterized in that the model of the amplifier U9
LMV321。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822152589.3U CN209104791U (en) | 2018-12-20 | 2018-12-20 | A kind of motor overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822152589.3U CN209104791U (en) | 2018-12-20 | 2018-12-20 | A kind of motor overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209104791U true CN209104791U (en) | 2019-07-12 |
Family
ID=67163201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822152589.3U Expired - Fee Related CN209104791U (en) | 2018-12-20 | 2018-12-20 | A kind of motor overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209104791U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359922A (en) * | 2021-06-22 | 2021-09-07 | 深圳华创芯光科技有限公司 | Current loop feedback control circuit and control method applied to OCC communication table lamp |
-
2018
- 2018-12-20 CN CN201822152589.3U patent/CN209104791U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359922A (en) * | 2021-06-22 | 2021-09-07 | 深圳华创芯光科技有限公司 | Current loop feedback control circuit and control method applied to OCC communication table lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190712 Termination date: 20211220 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |