CN206332435U - A kind of high current protection circuit - Google Patents
A kind of high current protection circuit Download PDFInfo
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- CN206332435U CN206332435U CN201621453981.6U CN201621453981U CN206332435U CN 206332435 U CN206332435 U CN 206332435U CN 201621453981 U CN201621453981 U CN 201621453981U CN 206332435 U CN206332435 U CN 206332435U
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- high current
- brshless
- protection circuit
- level conversion
- motor
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Abstract
The utility model is applied to protection circuit field there is provided a kind of high current protection circuit, and applied to brshless DC motor, high current protection circuit includes sampling unit, level conversion unit, control unit；Wherein, sampling unit is set to that the sampled signal for the electric current for flowing through brshless DC motor can be gathered, and sampled signal is transmitted to level conversion unit；Level conversion unit response sample signal formation level signal, and level signal is inputted to control unit；Whether the electric current that control unit judges to flow through brshless DC motor according to level signal is high current, if high current then controls brshless DC motor to be stopped.The high current protection circuit that the utility model is provided may recognize that the high current of brshless DC motor; and then control brshless DC motor to be stopped; brshless DC motor excessively stream is avoided to burn; and the component that circuit is used is discrete part composition; low cost; complexity is low, is adapted to extensive use.
Description
Technical field
The utility model belongs to protection circuit field, more particularly to a kind of high current for brshless DC motor protects electricity
Road.
Background technology
Brshless DC motor is made up of motor body and driver, is a kind of typical electromechanical integrated product, each
Suffer from being widely applied in class product.
When brshless DC motor is applied on specific product, there may be very high operating current.For example apply in a chain
Rated operational voltage on the product of saw is 120V, and rated operational current is 15A.But when chain is according to abnormal work, work
Electric current may exceed the current critical value of current-limiting protection device, must now allow electric machine controller to detect just considerably beyond 15A
It is abnormal to this high current, and then motor and controller is stopped, prevent that motor and controller excessively stream from burning.
At present, the integrated IC identifications high current such as commonly used comparator, such as go driving three using LM358 operational amplifiers
Pole pipe conducting makes motor and electric machine controller be stopped so as to recognize high current.But prior art simultaneously there is also into
This height, complexity is high, it is difficult to the problem of extensive use.
Utility model content
The utility model provides a kind of high current protection circuit, it is intended to solve high cost in the prior art, and complexity is high,
The problem of being difficult to extensive use.
The utility model is achieved in that a kind of high current protection circuit, applied to brshless DC motor, wherein, institute
Stating high current protection circuit includes sampling unit, level conversion unit, control unit；
The sampling unit, is set to gather the sampled signal for the electric current for flowing through the brshless DC motor, and by institute
Sampled signal is stated to transmit to the level conversion unit；
The level conversion unit, responds sampled signal formation level signal, and by the level signal input to
Described control unit；
Described control unit, if judging that it is big electricity to flow through the electric current of the brshless DC motor according to the level signal
Stream, then control the brshless DC motor to be stopped.
It is preferred that, the sampling unit includes first end and the second end；
The electric current for flowing through the brshless DC motor is flowed into from the first end of the use unit, from the use unit
Flow out at the second end；
The level conversion unit includes input and output end；
The input of the level conversion unit is used to receive the sampled signal, the output end of the level conversion unit
For exporting the level signal；
The first end of the use unit connects the input of the level conversion unit, the second end of the use unit
Ground connection；
The output end connection described control unit of the level conversion unit.
It is preferred that, the sampling unit includes at least one resistance；
When the quantity of the resistance is 1, one end of the resistance is used as the first end of the sampling unit, the resistance
The other end as the sampling unit the second end；
When the quantity of the resistance is more than 1, the resistance is interconnected to form resistance group in series or in parallel,
One end of the resistance group is as the first end of the sampling unit, and the other end of the resistance group is used as the sampling unit
Second end.
It is preferred that, the level conversion unit includes switch module, Voltage stabilizing module, first resistor R1, first voltage source
VCC1；
The switch module and the Voltage stabilizing module include respective first end and the second end respectively；
The first end of the switch module as the level conversion unit input, first with the sampling unit
End is connected, and the second end of the switch module connects the first end of the Voltage stabilizing module and one end of the first resistor R1；
The first end of the Voltage stabilizing module connects described control unit, institute as the output end of the level conversion unit
State the second end ground connection of Voltage stabilizing module；
The other end of the first resistor R1 connects the first voltage source VCC1.
It is preferred that, the level conversion unit also includes second resistance R2, is arranged in series in the second of the switch module
Between end and the first end of the Voltage stabilizing module.
It is preferred that, the Voltage stabilizing module includes voltage-regulator diode D1；
The negative pole of the voltage-regulator diode D1 as the Voltage stabilizing module first end；
The positive pole of the voltage-regulator diode D1 as the Voltage stabilizing module the second end.
It is preferred that, the Voltage stabilizing module also includes the first electric capacity C1 being connected in parallel with the voltage-regulator diode D1.
It is preferred that, the switch module includes triode Q1, the second voltage source VCC2；
The emitter stage of the triode Q1 as the switch module first end；
The colelctor electrode of the triode Q1 as the switch module the second end；
The base stage of the triode Q1 connects the second voltage source VCC2.
It is preferred that, the switch module also includes 3rd resistor R3, the 4th resistance R4；
The 3rd resistor R3 is arranged in series between the second voltage source VCC2 and the second end of the switch module；
One end of the 4th resistance R4 connects the second end of the switch module, another termination of the 4th resistance R4
Ground.
It is preferred that, the switch module includes triode Q1；
The base stage of the triode Q1 as the switch module first end；
The colelctor electrode of the triode Q1 as the switch module the second end；
The grounded emitter of the triode Q1.
It is preferred that, the switch module also includes the second electric capacity C2；
One end of the second electric capacity C2 connects the base stage of the three pole Q1, the other end connection institute of the second electric capacity C2
State triode Q1 emitter stage.
The high current protection circuit that the utility model is provided, applied to brshless DC motor, is gathered by sampling unit and flowed
The sampled signal of electric current through brshless DC motor, and sampled signal is transmitted to level conversion unit, by level conversion unit
Form level signal and be supplied to control unit, control unit can be identified according to level signal flows through the big of brshless DC motor
Electric current, and then control brshless DC motor to be stopped, it is to avoid brshless DC motor excessively stream is burnt, and it is big that the utility model is provided
The component that current protecting circuit is used is discrete part composition, and low cost, complexity is low, may be disposed at various dresses
The product of brshless DC motor is equipped with, is adapted to extensive use.
Brief description of the drawings
Fig. 1 is a kind of overall structure figure for high current protection circuit that the utility model is provided；
Fig. 2 is a kind of circuit structure diagram for high current protection circuit that the utility model is provided；
Fig. 3 is a kind of another circuit structure diagram for high current protection circuit that the utility model is provided.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
A kind of high current protection circuit provided by the utility model will be described in detail below.
As shown in Figure 1 and Figure 2, one embodiment of the present utility model provides a kind of high current protection circuit, applied to nothing
Brushless motor, the high current protection circuit includes sampling unit, level conversion unit, control unit；Wherein, sampling unit
The sampled signal of the electric current of the brshless DC motor is gathered, and sampled signal is transmitted to level conversion unit；Level conversion
Unit responds the sampled signal formation level signal, and the level signal is inputted to control unit；Control unit according to
The level signal controls the working condition of brshless DC motor, if control unit is according to being flowed through level signal judgement
The electric current of brshless DC motor is high current, then controls the brshless DC motor to be stopped, it is to avoid brshless DC motor mistake
Stream burns.
In the utility model embodiment, the sampling unit includes first end and the second end, flows through the brushless direct-current
The electric current of motor is flowed into from the first end of sampling unit, is flowed out from the second end of sampling unit, and then flows to ground；The level turns
Changing unit includes input and output end, and the input of level conversion unit is used to receive the sampled signal from sampling unit,
The input of level conversion unit is used for control unit outputs level signals；The first end and level conversion unit of sampling unit
Input be connected, the second end of sampling unit ground connection, the output end of level conversion unit is connected with control unit；
In the utility model embodiment, the sampling unit may include 2 resistance, and the resistance can be small using resistance
Resistance, such as resistance are 5m Ω constantan-made resistances；2 resistor coupled in parallel connect to form resistance group, and one end of resistance group is as adopting
With the first end of unit, the other end is taken as the second end of unit.Because the resistance of resistance is small, so right in actual applications
The circuit of brshless DC motor script is almost without influence, beneficial to the extensive use of the high current protection circuit.
In the utility model embodiment, the level conversion unit includes switch module, Voltage stabilizing module, first resistor
R1, first voltage source VCC1；The switch module and the Voltage stabilizing module include respective first end and the second end respectively；It is described
The first end of switch module is connected as the input of the level conversion unit with the first end of the sampling unit, described
Second end of switch module connects the first end of the Voltage stabilizing module and one end of the first resistor R1；The Voltage stabilizing module
First end connects described control unit, the second end ground connection of the Voltage stabilizing module as the output end of the level conversion unit；
The other end of the first resistor R1 connects the first voltage source VCC1.
In the utility model embodiment, the level conversion unit also includes second resistance R2, is arranged in series in described
Between second end of switch module and the first end of the Voltage stabilizing module, play current limliting, partial pressure.
In the utility model embodiment, the Voltage stabilizing module includes voltage-regulator diode D1；The voltage-regulator diode D1's
Negative pole as the Voltage stabilizing module first end；The positive pole of the voltage-regulator diode D1 as the Voltage stabilizing module the second end.
In the utility model embodiment, the Voltage stabilizing module also includes the first electric capacity C1, with the voltage-regulator diode simultaneously
Connection connection.The first electric capacity C1 is strobed, and the momentary fluctuation of voltage or electric current in circuit can be avoided to trigger described big
The protection act of current protecting circuit, increases the accuracy of identification of the high current protection circuit, and then improve brshless DC motor
The stability of working condition.
In the utility model embodiment, the switch module includes triode Q1, the second voltage source VCC2, three pole
Pipe Q1 can use NPN type triode；The emitter stage of the triode Q1 as the switch module first end；Three pole
Pipe Q1 colelctor electrode as the switch module the second end；The base stage of the triode Q1 connects the second voltage source
VCC2。
In the utility model embodiment, the switch module also includes 3rd resistor R3, the 4th resistance R4；Described 3rd
Resistance R3 is arranged in series between the second voltage source VCC2 and the second end of the switch module；The 4th resistance R4's
One end connects the second end of the switch module, the other end ground connection of the 4th resistance R4.Utilize 3rd resistor R3, the 4th electricity
The partial pressure effect of resistance, more accurate, convenient can adjust to the magnitude of voltage added by triode Q1 base stage, reduces to second voltage
Source VCC2 magnitude of voltage precision and the requirement of controllability, beneficial to the extensive use of the high current protection circuit.
In the utility model embodiment, described control unit can use single-chip microcomputer, and the meaning method as common on the market is partly led
The STM8S series monolithics of body company production；I/O mouthfuls of connection level conversion units of single-chip microcomputer, for receiving
The level signal of level conversion unit formation is stated, and is judged according to the level signal to flow through the electric current of the brshless DC motor
Whether it is high current, if high current then controls the brshless DC motor to be stopped.
The operation principle of circuit shown in Fig. 1 described further below：
The electric current for flowing through the brshless DC motor is flowed into from the first end of the sampling module, from the sampling module
Second end is flowed out and flows to ground, and pressure drop is formed in the resistance group of the sampling module.Assuming that flowing through the brshless DC motor
Electric current be I, the resistance of the resistance group of the sampling module is R, and the pressure drop is U, then U=IR, the sampling unit the
The magnitude of voltage of the magnitude of voltage of end and the level conversion unit input end is also U, i.e., triode Q emitter stage is applied
Plus voltage Ue=U；Assuming that the second voltage source VCC2 magnitude of voltage U2,3rd resistor R3 resistance are R3, the 4th resistance R4's
Resistance is R4；The voltage Ub=U2R4/ (R3+R4) that then base stage to triode Q1 is applied.
When the brshless DC motor normal work, the electric current I for flowing through the brshless DC motor is rated current, i.e.,
I value is smaller, and Ub-Ue value is larger；When the brshless DC motor abnormal work, the electric current of the brshless DC motor is flowed through
During much larger than rated current, the circuit is larger for high current, i.e. I value, and Ub-Ue value is smaller.When Ub-Ue value is more than three
During pole pipe Q1 conducting voltage, triode Q1 conductings, in the output end formation low level signal of level conversion unit；Work as Ub-Ue
Value be less than triode Q1 conducting voltage when, triode Q1 cut-off, by voltage-regulator diode Z1 pressure stabilization function, in voltage stabilizing mould
Certain voltage difference is formed between the first end of block and the second end, so that in the output end formation high level letter of level conversion unit
Number.Single-chip microcomputer obtains level signal by the I/O mouths being connected with level conversion unit, in the software programming of single-chip microcomputer, sets
Stoppage protection is triggered for high level, then when single-chip microcomputer gets high level signal, controls the brshless DC motor to stop work
Make, so as to avoid the brshless DC motor excessively stream from burning.
As shown in figure 3, it is of the present utility model another embodiment provides for a kind of high current protection circuit, applied to brushless
Direct current generator.The present embodiment is compared with embodiment illustrated in fig. 1, and difference is only that the structure of switch module and the work original of circuit
Reason is different, therefore only the differential section of the present embodiment and embodiment illustrated in fig. 1 is described in detail below, and other parts are no longer
Repeat.
In the utility model embodiment, the switch module can use NPN including triode Q1, the triode Q1
Type triode；The base stage of the triode Q1 as the switch module first end；The colelctor electrode conduct of the triode Q1
Second end of the switch module；The grounded emitter of the triode Q1.
In the utility model embodiment, the switch module also includes the second electric capacity C2, the one of the second electric capacity C2
End connection three pole Q1 base stage, the other end of the second electric capacity C2 connects the emitter stage of the triode Q1.Described
Two electric capacity C2 strobe, and can avoid protecting because the electric current momentary fluctuation for flowing through the countless direct current generators triggers the high current
The stoppage protection action of protection circuit, increases the accuracy of identification of the high current protection circuit, and then improve brshless DC motor work
Make the stability of state.
The operation principle of circuit shown in Fig. 2 described further below：
The electric current for flowing through the brshless DC motor is flowed into from the first end of the sampling module, from the sampling module
Second end is flowed out and flows to ground, and pressure drop is formed in the resistance group of the sampling module.Assuming that flowing through the brshless DC motor
Electric current be I ', the resistance of the resistance group of the sampling module is R ', and the pressure drop is U ', then U '=I ' R ', the sampling
The magnitude of voltage of magnitude of voltage and the level conversion unit input end at unit first end is also U ', the i.e. base to triode Q
Voltage Ub '=U ' that pole is applied.
When the brshless DC motor normal work, the electric current I ' for flowing through the brshless DC motor is rated current,
That is I ' value is smaller, and Ub ' value is smaller；When the brshless DC motor abnormal work, the electricity of the brshless DC motor is flowed through
When stream is much larger than rated current, the circuit is larger for high current, i.e. I ' value, and Ub ' value is larger.The value for working as Ub ' is more than three
During pole pipe Q1 conducting voltage, triode Q1 conductings, in the output end formation low level signal of level conversion unit；Work as Ub's '
When value is less than triode Q1 conducting voltage, triode Q1 cut-offs, by voltage-regulator diode Z1 pressure stabilization function, in Voltage stabilizing module
First end and the second end between form certain voltage difference so that level conversion unit output end formation high level letter
Number.Single-chip microcomputer obtains level signal by the I/O mouths being connected with level conversion unit, in the software programming of single-chip microcomputer, sets
Stoppage protection is triggered for low level, then when single-chip microcomputer gets low level signal, controls the brshless DC motor to stop work
Make, so as to avoid the brshless DC motor excessively stream from burning.
The high current protection circuit that the utility model is provided, applied to brshless DC motor, is gathered by sampling unit and flowed
The sampled signal of electric current through brshless DC motor, and sampled signal is transmitted to level conversion unit, by level conversion unit
Form level signal and be supplied to control unit, control unit can be identified according to level signal flows through the big of brshless DC motor
Electric current, and then control brshless DC motor to be stopped, it is to avoid brshless DC motor excessively stream is burnt, and it is big that the utility model is provided
The component that current protecting circuit is used is discrete part composition, and low cost, complexity is low, may be disposed at various dresses
The product of brshless DC motor is equipped with, is adapted to extensive use.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (11)
1. a kind of high current protection circuit, applied to brshless DC motor, it is characterised in that including sampling unit, level conversion
Unit, control unit；
The sampling unit, is set to that the sampled signal for the electric current for flowing through the brshless DC motor can be gathered, and adopt described
Sample signal transmission is to the level conversion unit；
The level conversion unit, responds the sampled signal formation level signal, and the level signal is inputted to described
Control unit；
Described control unit, if the electric current for judging to flow through the brshless DC motor according to the level signal is high current,
The brshless DC motor is controlled to be stopped.
2. high current protection circuit as claimed in claim 1, it is characterised in that the sampling unit includes first end and second
End；
The electric current for flowing through the brshless DC motor is flowed into from the first end of the sampling unit, from the second of the sampling unit
End outflow；
The level conversion unit includes input and output end；
The input of the level conversion unit is used to receive the sampled signal, and the output end of the level conversion unit is used for
Export the level signal；
The first end of the sampling unit connects the input of the level conversion unit, the second termination of the sampling unit
Ground；
The output end connection described control unit of the level conversion unit.
3. high current protection circuit as claimed in claim 2, it is characterised in that the sampling unit includes at least one resistance；
When the quantity of the resistance is 1, one end of the resistance as the sampling unit first end, the resistance it is another
One end as the sampling unit the second end；
When the quantity of the resistance is more than 1, the resistance is interconnected to form resistance group in series or in parallel, described
One end of resistance group is as the first end of the sampling unit, and the other end of the resistance group is used as the second of the sampling unit
End.
4. high current protection circuit as claimed in claim 2, it is characterised in that the level conversion unit includes switching molding
Block, Voltage stabilizing module, first resistor R1, first voltage source VCC1；
The switch module and the Voltage stabilizing module include respective first end and the second end respectively；
The first end of the switch module is as the input of the level conversion unit, the first end phase with the sampling unit
Even, the second end of the switch module connects the first end of the Voltage stabilizing module and one end of the first resistor R1；
The first end of the Voltage stabilizing module connects described control unit as the output end of the level conversion unit, described steady
The second end ground connection of die block；
The other end of the first resistor R1 connects the first voltage source VCC1.
5. high current protection circuit as claimed in claim 4, it is characterised in that the level conversion unit also includes the second electricity
R2 is hindered, is arranged in series between the second end of the switch module and the first end of the Voltage stabilizing module.
6. the high current protection circuit as described in claim 4 or 5, it is characterised in that the Voltage stabilizing module includes the pole of voltage stabilizing two
Pipe D1；
The negative pole of the voltage-regulator diode D1 as the Voltage stabilizing module first end；
The positive pole of the voltage-regulator diode D1 as the Voltage stabilizing module the second end.
7. high current protection circuit as claimed in claim 6, it is characterised in that the Voltage stabilizing module also includes and the voltage stabilizing
The first electric capacity C1 that diode D1 is connected in parallel.
8. the high current protection circuit as described in claim 4 or 5, it is characterised in that the switch module include triode Q1,
The second voltage source VCC2；
The emitter stage of the triode Q1 as the switch module first end；
The colelctor electrode of the triode Q1 as the switch module the second end；
The base stage of the triode Q1 connects the second voltage source VCC2.
9. high current protection circuit as claimed in claim 8, it is characterised in that the switch module also includes 3rd resistor
R3, the 4th resistance R4；
The 3rd resistor R3 is arranged in series between the second voltage source VCC2 and the second end of the switch module；
One end of the 4th resistance R4 connects the second end of the switch module, the other end ground connection of the 4th resistance R4.
10. the high current protection circuit as described in claim 4 or 5, it is characterised in that the switch module includes triode
Q1；
The base stage of the triode Q1 as the switch module first end；
The colelctor electrode of the triode Q1 as the switch module the second end；
The grounded emitter of the triode Q1.
11. high current protection circuit as claimed in claim 10, it is characterised in that the switch module also includes the second electric capacity
C2；
One end of the second electric capacity C2 connects the base stage of the three pole Q1, the other end connection described three of the second electric capacity C2
Pole pipe Q1 emitter stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453981.6U CN206332435U (en) | 2016-12-28 | 2016-12-28 | A kind of high current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621453981.6U CN206332435U (en) | 2016-12-28 | 2016-12-28 | A kind of high current protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206332435U true CN206332435U (en) | 2017-07-14 |
Family
ID=59293201
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| CN201621453981.6U Active CN206332435U (en) | 2016-12-28 | 2016-12-28 | A kind of high current protection circuit |
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| CN (1) | CN206332435U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308391A (en) * | 2019-06-07 | 2019-10-08 | 横店集团英洛华电气有限公司 | A kind of low cost current of electric Acquisition Circuit and its acquisition method |
-
2016
- 2016-12-28 CN CN201621453981.6U patent/CN206332435U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308391A (en) * | 2019-06-07 | 2019-10-08 | 横店集团英洛华电气有限公司 | A kind of low cost current of electric Acquisition Circuit and its acquisition method |
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