CN208028798U - brushless direct current motor drive circuit and system - Google Patents
brushless direct current motor drive circuit and system Download PDFInfo
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- CN208028798U CN208028798U CN201820473718.6U CN201820473718U CN208028798U CN 208028798 U CN208028798 U CN 208028798U CN 201820473718 U CN201820473718 U CN 201820473718U CN 208028798 U CN208028798 U CN 208028798U
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Abstract
The utility model is related to a kind of brushless direct current motor drive circuit and system, brushless direct current motor drive circuit includes controller, switch unit and three-phase metal-oxide-semiconductor driving circuit.The anode of power supply connects the power input of three-phase metal-oxide-semiconductor driving circuit by switch unit.The cathode of power supply is connect with the ground terminal of switch unit, three-phase metal-oxide-semiconductor driving circuit successively.When operator needs the brshless DC motor to stop, the switch unit switches to the first closed state, the three-phase metal-oxide-semiconductor driving circuit power-off, and, parasitic diode in the brshless DC motor, the switch unit and the three-phase metal-oxide-semiconductor driving circuit collectively forms circuit so that the brshless DC motor is braked.The brushless direct current motor drive circuit and system only need to realize braking to brshless DC motor by controlling switch unit, without controlling metal-oxide-semiconductor, simplify brake control mode.
Description
Technical field
The utility model is related to brshless DC motor technical fields, more particularly to a kind of brushless direct current motor drive circuit
And system.
Background technology
Brshless DC motor is made of motor body and driver, is a kind of typical electromechanical integrated product, tool
There are the advantages such as good speed adjustment features, small, efficient, is widely used in many fields.Short circuit braking is traditional nothing
Brushless motor pass through frequently with a kind of brake modes, the mode of braking pass through control three-phase metal-oxide-semiconductor bridge drive circuit in
Metal-oxide-semiconductor is braked to realize, i.e., the upper bridge arm (either lower bridge arm) of driving all turns on and lower bridge arm (or upper bridge arm) is in cut-off
State, at this moment the threephase stator winding of brshless DC motor be all shorted, the brushless dc in generating state when brake
Machine is equivalent to power supply and is short-circuited.In addition, the resistance due to winding is smaller, prodigious short circuit current can be generated so that nothing
The kinetic energy of brushless motor is fast released, and can achieve the effect that Quick brake.Also, the speed of brshless DC motor is got over
Height, short circuit current is bigger, and brake force is also bigger.
However, above-mentioned mode of braking needs that each metal-oxide-semiconductor is driven to be in corresponding state, it can just make brshless DC motor real
It now brakes, mode of operation is complex.
Utility model content
Based on this, it is necessary to for the problem of traditional short circuit mode of braking control mode complexity, provide a kind of brushless direct-current
Motor-drive circuit and system.
A kind of brushless direct current motor drive circuit, including controller and three-phase metal-oxide-semiconductor driving circuit；The controller it is defeated
Outlet is connect with the control signal of the three-phase metal-oxide-semiconductor driving circuit, and the output end of the three-phase MOS tube drive circuits is used
To connect brshless DC motor；The brushless direct current motor drive circuit further includes switch unit；The anode of power supply passes through described
Switch unit connects the power input of the three-phase metal-oxide-semiconductor driving circuit；The cathode of the power supply is single with the switch successively
The ground terminal of first, the described three-phase metal-oxide-semiconductor driving circuit connects；
When operator needs the brshless DC motor to stop, the switch unit switches to the first closed state, institute
State the power-off of three-phase metal-oxide-semiconductor driving circuit, also, the brshless DC motor, the switch unit and three-phase metal-oxide-semiconductor driving
Parasitic diode in circuit collectively forms circuit so that the brshless DC motor is braked.
The brushless direct current motor drive circuit further includes resistance in one of the embodiments, and the switch unit
It is connect with the cathode of the power supply by the resistance；
When the switch unit switches to first closed state, the brshless DC motor, the switch unit,
Parasitic diode in the resistance and the three-phase metal-oxide-semiconductor driving circuit collectively forms circuit so that the brushless dc
Machine is braked.
The switch unit can also switch to the second closed state in one of the embodiments,；Also, work as the switch
When unit switches to second closed state, the power supply is to the three-phase metal-oxide-semiconductor driving circuit normal power supply.
The switch unit includes first switch and the second switch in one of the embodiments,；The first switch
One end is connect with the ground terminal of the cathode of the power supply, the three-phase metal-oxide-semiconductor driving circuit respectively, the first switch it is another
End connects the power input of the three-phase metal-oxide-semiconductor driving circuit；One end of the second switch connects the anode of the power supply,
The other end of the second switch connects the power input of the three-phase metal-oxide-semiconductor driving circuit；
The first switch is closed, and when second switch disconnection, the switch unit is in first closed form
State；The first switch disconnects, and when second switch closure, the switch unit is in second closed state.
The switch unit includes the first stationary contact, the second stationary contact and moving contact in one of the embodiments,；It is described
First stationary contact is connect with the anode of the power supply；Second stationary contact is connect with the cathode of the power supply；The moving contact
It can be with movable one end for connecting first stationary contact or second stationary contact, the static one end connection of the moving contact
The power input of the three-phase metal-oxide-semiconductor driving circuit；
When the moving contact can be connect with movable one end with first stationary contact, the switch unit is in described
Second closed state；When the moving contact can be connect with movable one end with second stationary contact, at the switch unit
In first closed state.
The switch unit is single-pole double-throw switch (SPDT) or relay in one of the embodiments,.
The switch unit is manually controlled by operator in one of the embodiments,.
The switch unit is also connect with the controller in one of the embodiments,；Also, when operator needs institute
When stating brshless DC motor stopping, the controller controls the switch unit and switches to first closed state.
The power input of the controller connects the power supply by the switch unit in one of the embodiments,
Anode；Also, the ground terminal of the controller respectively with the cathode of the power supply, the switch unit, the three-phase metal-oxide-semiconductor
The ground terminal of driving circuit connects；
After the switch unit switches to first closed state, the power supply stops powering to the controller.
A kind of BLDCM Drive System, including controller, three-phase metal-oxide-semiconductor driving circuit and brshless DC motor；
The output end of the controller is connect with the control signal of the three-phase metal-oxide-semiconductor driving circuit, the three-phase metal-oxide-semiconductor driving electricity
The output end on road is connect with the brshless DC motor；The brushless direct current motor drive circuit further includes switch unit；Power supply
Anode the power inputs of the three-phase MOS tube drive circuits is connected by the switch unit；The cathode of the power supply according to
The secondary ground terminal with the switch unit, the three-phase MOS tube drive circuits is connect；
When operator needs the brshless DC motor to stop, the switch unit switches to the first closed state；When
When the switch unit switches to first closed state, the three-phase metal-oxide-semiconductor driving circuit power-off, also, it is described brushless
Parasitic diode in direct current generator, the switch unit and the three-phase metal-oxide-semiconductor driving circuit collectively forms circuit so that institute
Brshless DC motor is stated to be braked.
Above-mentioned brushless direct current motor drive circuit and system have the advantage that for：Electricity is driven in the brshless DC motor
In road and system, when operator needs the brshless DC motor to stop, switch unit switches to the first closed state.When opening
When switching to the first closed state at the unit of pass, the power-off of three-phase metal-oxide-semiconductor driving circuit, also, brshless DC motor, switch unit
And the parasitic diode in three-phase metal-oxide-semiconductor driving circuit collectively forms circuit so that brshless DC motor is short-circuited, to play
The effect of brushless direct current generator, it is final the kinetic energy of brshless DC motor to may make to be completely released by the circuit.Cause
This brushless direct current motor drive circuit and system only need to realize system to brshless DC motor by controlling switch unit
It is dynamic, without controlling metal-oxide-semiconductor, simplify brake control mode.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings the attached drawing of other embodiment.
Fig. 1 is the composition frame chart of brushless direct current motor drive circuit and brshless DC motor that an embodiment provides；
Fig. 2 is specific for the brushless direct current motor drive circuit of embodiment illustrated in fig. 1 and the one of which of brshless DC motor
Composition frame chart；
Fig. 3 is that the brushless direct current motor drive circuit of embodiment illustrated in fig. 1 and brshless DC motor one of which are normally transported
Physical circuit figure when row；
When Fig. 4 is brushless direct current motor drive circuit and the brake of brshless DC motor one of which of embodiment illustrated in fig. 1
Physical circuit figure.
Specific implementation mode
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The preferred embodiment of the utility model is given in attached drawing.But the utility model can in many different forms come in fact
It is existing, however it is not limited to embodiment described herein.Make public affairs to the utility model on the contrary, purpose of providing these embodiments is
The understanding for opening content is more thorough and comprehensive.
Unless otherwise defined, all of technologies and scientific terms used here by the article and the technical field for belonging to utility model
The normally understood meaning of technical staff it is identical.It is intended merely to retouch in the term used in the description of utility model herein
State the purpose of specific embodiment, it is not intended that limitation the utility model.Term as used herein "and/or" include one or
Any and all combinations of multiple relevant Listed Items.
Referring to FIG. 1, an embodiment provides a kind of brushless direct current motor drive circuit 100, it is used for driving brushless straight
Galvanic electricity machine 200 is run.Also, brushless direct current motor drive circuit 100 includes controller 110, three-phase metal-oxide-semiconductor driving circuit 120
And switch unit 130.
Wherein, controller 110 refers to the integrated circuit for having data-handling capacity, such as microcontroller and its peripheral circuit,
Peripheral circuit includes but is not limited only to reduction voltage circuit, signal acquisition circuit etc..Three-phase metal-oxide-semiconductor driving circuit 120 refers to by several
The driving circuit that metal-oxide-semiconductor connects and composes, and 3 phase control signals are exported respectively to the three-phase windings of brshless DC motor 200, with control
Brshless DC motor 200 processed carries out commutation energization.Such as：Three-phase metal-oxide-semiconductor driving circuit 120 can be made of 6 metal-oxide-semiconductors
3 phase metal-oxide-semiconductor bridge drive circuits (as shown in Figure 3, Figure 4), and in the 3 phase metal-oxide-semiconductor bridge drive circuit, including on 3
Bridge arm and 3 lower bridge arms.In addition, in three-phase metal-oxide-semiconductor driving circuit 120, all there is parasitic diode in each metal-oxide-semiconductor, and parasitic
When the direction of the positive best cathode of diode and 200 normal operation of brshless DC motor in brushless direct current motor drive circuit 100
The current direction flowed through is opposite.
Connection relation in brushless direct current motor drive circuit 100 between each device is：The output end of controller 110 and three
The control signal of phase metal-oxide-semiconductor driving circuit 120 connects, and the output end of controller 110 to the grid of each metal-oxide-semiconductor for applying
Add the adjustable drive signal of duty ratio, to control the make-and-break time of each metal-oxide-semiconductor.The output end of three-phase metal-oxide-semiconductor driving circuit 120 is used
Brshless DC motor 200 is connected, to carry out commutation control to brshless DC motor 200.The anode of power supply 300 passes through switch
Unit 130 connects the power input of three-phase metal-oxide-semiconductor driving circuit 120.The cathode of power supply 300 successively with switch unit 130,
The ground terminal of three-phase metal-oxide-semiconductor driving circuit 120 connects.Wherein, if three-phase metal-oxide-semiconductor driving circuit 120 is 3 phase metal-oxide-semiconductor bridge-types
Driving circuit, then the ground terminal of three-phase metal-oxide-semiconductor driving circuit 120 is the source electrode of the metal-oxide-semiconductor of each lower bridge arm.
In the utility model embodiment, after switch unit 130 receives brake instruction, the first closed state is switched to.Also,
When switch unit 130 switches as the first closed state, three-phase metal-oxide-semiconductor driving circuit 120 powers off, also, brushless dc
Parasitic diode in machine 200, switch unit 130 and three-phase metal-oxide-semiconductor driving circuit 120 constitutes circuit so that brushless dc
Machine 200 is braked.
Wherein, it when switch unit 130 switches to the first closed state, is equivalent to three-phase metal-oxide-semiconductor driving circuit 120
The ground terminal of power input and three-phase metal-oxide-semiconductor driving circuit 120 is connected, and has been simultaneously switched off power supply 300 and has been driven to three-phase metal-oxide-semiconductor
The power supply circuit of circuit 120.Also, in brake brshless DC motor 200 by the role switching of engine to generator, to
It converts kinetic energy into electric energy and is exported in turn to three-phase metal-oxide-semiconductor driving circuit 120.Due in three-phase metal-oxide-semiconductor driving circuit 120
The direction of the positive best cathode of the parasitic diode of each metal-oxide-semiconductor and brshless DC motor when 200 normal operation of brshless DC motor
Therefore the current direction flowed through in driving circuit 100 is on the contrary, be nothing after generator in the role transforming of brshless DC motor 200
These parasitic diodes can be connected in the electric current that brushless motor 200 exports, meanwhile, it switches to first in switch unit 130 and closes
On the basis of conjunction state, so as to form one by brshless DC motor 200, switch unit 130 and three-phase metal-oxide-semiconductor driving circuit
The circuit that parasitic diode in 120 is constituted so that brshless DC motor 200 is braked, so as to be consumed by the circuit
Fall kinetic energy of the brshless DC motor 200 in brake, to achieve the effect that brushless direct current generator 200.
In conclusion the above-mentioned brushless direct current motor drive circuit 100 that the utility model embodiment provides, it is only necessary to pass through
Brshless DC motor 200 can be realized the effect of braking, without controlling metal-oxide-semiconductor, letter by controlling switch unit 130
Brake control mode is changed.
Further, above-mentioned brushless direct current motor drive circuit 100 further includes resistance R1, is please referred to Fig.2.Switch unit
130 are connect by resistance R1 with the cathode of power supply 300.At this moment, brushless straight when switch unit 130 is in the first closed state
Parasitic diode in galvanic electricity machine 200, switch unit 130, resistance R1 and three-phase metal-oxide-semiconductor driving circuit 120 collectively forms circuit,
So that brshless DC motor 200 is braked.
Since the electric current in circuit can flow through resistance R1, so as to effectively inhibit brushless dc by resistance R1
Dash current when machine 200 brakes, and then protect entire brushless direct current motor drive circuit 100.
Further, in above-mentioned brushless direct current motor drive circuit 100, switch unit 130 can also switch to second and close
Conjunction state.Also, when switch unit 130 switches to the second closed state, power supply 300 to three-phase metal-oxide-semiconductor driving circuit 120 just
Often power supply.
Therefore, when switch unit 130 switches to the second closed state, it is equivalent to the anode and three for having connected power supply 300
Connection circuit between the power input of phase metal-oxide-semiconductor driving circuit 120, at this moment, power supply 300 can drive three-phase metal-oxide-semiconductor
120 normal power supply of circuit.
Under the premise of above-mentioned switch unit 130 can switch to the first closed state and the second closed state respectively, open
The concrete structure for closing unit 130 at least can be any one of following two situations.
The first situation is：Specifically, referring to FIG. 2, switch unit 130 includes first switch 131 and second switch
132.One end of first switch 131 is connect with the ground terminal of the cathode of power supply 300, three-phase metal-oxide-semiconductor driving circuit 120 respectively.Tool
Body, equipped with resistance R1, one end of first switch 131 by resistance R1 respectively with the cathode of power supply 300, three-phase
The ground terminal of metal-oxide-semiconductor driving circuit 120 connects.The electricity of the other end connection three-phase metal-oxide-semiconductor driving circuit 120 of first switch 131
Source input terminal.The anode of one end connection power supply 300 of second switch 132, the other end of second switch 132 connect three-phase metal-oxide-semiconductor
The power input of driving circuit 120.Wherein, first switch 131 and second switch 132 all have both shapes of open and close
State.Specifically, second switch 132 is, for example, handle switch.
When first switch 131 is closed, and second switch 132 disconnects, the electricity of three-phase metal-oxide-semiconductor driving circuit 120 has been connected
Circuit between source input terminal and the ground terminal of three-phase metal-oxide-semiconductor driving circuit 120, and it is disconnected the anode and three-phase of power supply 300
Connection circuit between the power input of metal-oxide-semiconductor driving circuit 120, therefore switch unit 130 is in above-mentioned first closed form
State.
When first switch 131 disconnects, and second switch 132 is closed, it is disconnected the electricity of three-phase metal-oxide-semiconductor driving circuit 120
Circuit between source input terminal and the ground terminal of three-phase metal-oxide-semiconductor driving circuit 120, and connected the anode and three-phase of power supply 300
Connection circuit between the power input of metal-oxide-semiconductor driving circuit 120, therefore switch unit 130 is in above-mentioned second closed form
State.
The second situation is：Specifically, it please refers to Fig.3 and Fig. 4, switch unit 130 includes the first stationary contact (1), second
Stationary contact (2) and moving contact.Wherein, the first stationary contact and the second stationary contact are the contacts to remain static, and can be with
It is conductive.One end (3) of moving contact is fixed, and the other end can be movable, and moving contact can also be conductive.First stationary contact (1) and electricity
The anode connection in source 300.Second stationary contact (2) is connect with the cathode of power supply 300.Moving contact can be with movable one end for connecting
The first stationary contact (1) or the second stationary contact (2) are connect, static one end of moving contact (3) connects three-phase metal-oxide-semiconductor driving circuit 120
Power input.Specifically, switch unit 130 can be single-pole double-throw switch (SPDT) or relay.
Referring to FIG. 3, when moving contact can be connect with movable one end with the first stationary contact (1), the anode of power supply 300
It is connected to the power input of three-phase metal-oxide-semiconductor driving circuit 120, also, the power input of three-phase metal-oxide-semiconductor driving circuit 120
It is to disconnect between the ground terminal of three-phase metal-oxide-semiconductor driving circuit 120, at this moment switch unit 130 is in above-mentioned second closed form
State, power supply 300 is to 120 normal power supply of three-phase metal-oxide-semiconductor driving circuit.It is whole by taking the VW of brshless DC motor 200 is conducted as an example
Sense of current is as shown by the dotted line in fig. 3 in a brushless direct current motor drive circuit.
Referring to FIG. 4, when moving contact can be connect with movable one end with the second stationary contact (2), the anode of power supply 300
It is disconnected with the power input of three-phase metal-oxide-semiconductor driving circuit 120,120 power down of three-phase metal-oxide-semiconductor driving circuit, also, three-phase MOS
It is connected between the power input of tube drive circuit 120 and the ground terminal of three-phase metal-oxide-semiconductor driving circuit 120, at this moment switchs
Unit 130 is in above-mentioned first closed state.At this point, the electric current that brshless DC motor 200 is converted by kinetic energy then passes through successively：
Parasitic diode, cathode power supply line, switch unit 130, the negative power supply of upper bridge metal-oxide-semiconductor in three-phase metal-oxide-semiconductor driving circuit 120
The parasitic diode of lower bridge metal-oxide-semiconductor plays brushless direct current to be formed into a loop in line, three-phase metal-oxide-semiconductor driving circuit 120
The effect of motor 200.
Specifically, above-mentioned switch unit 130 can be manually controlled by operator, i.e., operator can control switch unit
130 switch between the first closed state and the second closed state.
Alternatively, switch unit 130 can also be controlled by controller 110.At this moment, switch unit 130 also with controller 110
Connection.Also, when the judgement of controller 110 needs brake, control switch unit 130 switches to the first closed state, or works as
When operator triggers trigger, controller receives brake signal control switch unit 130 and switches to the first closed state.
Further, in above-mentioned brushless direct current motor drive circuit 100, switch unit 130 can also control power supply 300
To the energization situation of controller 110, principle is as follows.
It please refers to Fig.1 to Fig. 4, the power input of controller 110 is connecting power supply 300 just by switch unit 130
Pole.Also, the ground terminal of controller 110 respectively with the cathode of power supply 300, switch unit 130, three-phase metal-oxide-semiconductor driving circuit 120
Ground terminal connection.At this moment, after switch unit 130 switches to the first closed state, power supply 300 is simultaneously stopped to controller
110 and three-phase metal-oxide-semiconductor driving circuit 120 power.Also, after switch unit 130 switches to the second closed state, power supply 300
It again can be simultaneously to 120 normal power supply of controller 110 and three-phase metal-oxide-semiconductor driving circuit.
Therefore, referring to FIG. 4, including the first stationary contact (1), the second stationary contact (2) and moving contact with switch unit 130,
And circuit includes illustrating for resistance R1：After switch unit 130 switches to the first closed state, power supply 300 stops
It only powers to controller 110 and three-phase metal-oxide-semiconductor driving circuit 120, also, upper bridge metal-oxide-semiconductor in three-phase metal-oxide-semiconductor driving circuit 120
Parasitic diode, cathode power supply line, switch unit 130, resistance R1, in anode power cord and three-phase metal-oxide-semiconductor driving circuit 120
The parasitic diode of lower bridge metal-oxide-semiconductor collectively forms circuit, so that 200 short circuit of brshless DC motor, to reach brushless
The effect of direct current generator 200.
In addition, referring to FIG. 3, equally including the first stationary contact (1), the second stationary contact (2) and being moved with switch unit 130
Contact, and circuit includes illustrating for resistance R1：After switch unit 130 switches to the second closed state, power supply
300 anode in turn switches on the power input of controller 110, three-phase metal-oxide-semiconductor driving circuit 120 by switch unit 130
Power input, at this moment, controller 110, all normal power supplies of three-phase metal-oxide-semiconductor driving circuit 120.
Another embodiment provides a kind of BLDCM Drive System, including controller, three-phase metal-oxide-semiconductor driving circuit
And brshless DC motor.The output end of the controller is connect with the control signal of the three-phase metal-oxide-semiconductor driving circuit, described
The output end of three-phase metal-oxide-semiconductor driving circuit is connect with the brshless DC motor.The brushless direct current motor drive circuit also wraps
Include switch unit.The anode of power supply connects the power input of the three-phase metal-oxide-semiconductor driving circuit by the switch unit.Institute
The cathode for stating power supply is connect with the ground terminal of the switch unit, the three-phase metal-oxide-semiconductor driving circuit successively.
When operator needs the brshless DC motor to stop, the switch unit switches to the first closed state.When
When the switch unit switches to first closed state, the three-phase metal-oxide-semiconductor driving circuit power-off, also, it is described brushless
Parasitic diode in direct current generator, the switch unit and the three-phase metal-oxide-semiconductor driving circuit collectively forms circuit so that institute
Brshless DC motor is stated to be braked.
The above-mentioned BLDCM Drive System that the utility model embodiment provides, it is only necessary to by controlling switch unit
It can realize that the effect of braking simplifies brake control mode without controlling metal-oxide-semiconductor to brshless DC motor.
It should be noted that the above-mentioned BLDCM Drive System that the utility model embodiment provides, with above-mentioned reality
The brshless DC motor crystal drive circuit for applying example offer corresponds to, and just repeats no more here.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of brushless direct current motor drive circuit, including controller and three-phase metal-oxide-semiconductor driving circuit；The output of the controller
End is connect with the control signal of the three-phase metal-oxide-semiconductor driving circuit, and the output end of the three-phase metal-oxide-semiconductor driving circuit is used for connecting
Connect brshless DC motor；It is characterized in that, the brushless direct current motor drive circuit further includes switch unit；The anode of power supply is logical
Cross the power input that the switch unit connects the three-phase metal-oxide-semiconductor driving circuit；The cathode of the power supply successively with it is described
The ground terminal connection of switch unit, the three-phase metal-oxide-semiconductor driving circuit；
When operator needs the brshless DC motor to stop, the switch unit switches to the first closed state, and described three
Phase metal-oxide-semiconductor driving circuit powers off, also, the brshless DC motor, the switch unit and the three-phase metal-oxide-semiconductor driving circuit
Interior parasitic diode collectively forms circuit so that the brshless DC motor is braked.
2. brushless direct current motor drive circuit according to claim 1, which is characterized in that the brshless DC motor driving
Circuit further includes resistance, and the switch unit is connect by the resistance with the cathode of the power supply；
It is the brshless DC motor, the switch unit, described when the switch unit switches to first closed state
Parasitic diode in resistance and the three-phase metal-oxide-semiconductor driving circuit collectively forms circuit so that the brshless DC motor quilt
Brake.
3. brushless direct current motor drive circuit according to claim 1, which is characterized in that the switch unit can also switch
To the second closed state；Also, when the switch unit switches to second closed state, the power supply is to the three-phase
Metal-oxide-semiconductor driving circuit normal power supply.
4. brushless direct current motor drive circuit according to claim 3, which is characterized in that the switch unit includes first
Switch and second switch；One end of the first switch respectively with the cathode of the power supply, the three-phase metal-oxide-semiconductor driving circuit
Ground terminal connects, and the other end of the first switch connects the power input of the three-phase metal-oxide-semiconductor driving circuit；Described second
One end of switch connects the anode of the power supply, and the other end of the second switch connects the three-phase metal-oxide-semiconductor driving circuit
Power input；
The first switch is closed, and when second switch disconnection, the switch unit is in first closed state；Institute
First switch disconnection is stated, and when second switch closure, the switch unit is in second closed state.
5. brushless direct current motor drive circuit according to claim 3, which is characterized in that the switch unit includes first
Stationary contact, the second stationary contact and moving contact；First stationary contact is connect with the anode of the power supply；Second stationary contact with
The cathode of the power supply connects；The moving contact can be with movable one end for connecting first stationary contact or described second quiet
Contact, the static one end of the moving contact connect the power input of the three-phase metal-oxide-semiconductor driving circuit；
When the moving contact can be connect with movable one end with first stationary contact, the switch unit is in described second
Closed state；When the moving contact can be connect with movable one end with second stationary contact, the switch unit is in institute
State the first closed state.
6. brushless direct current motor drive circuit according to claim 5, which is characterized in that the switch unit is that hilted broadsword is double
Throw switch or relay.
7. the brushless direct current motor drive circuit according to any claim in claim 1 to 6, which is characterized in that institute
Switch unit is stated to be manually controlled by operator.
8. the brushless direct current motor drive circuit according to any claim in claim 1 to 6, which is characterized in that institute
Switch unit is stated also to connect with the controller；Also, when operator needs the brshless DC motor to stop, the control
Device controls the switch unit and switches to first closed state.
9. the brushless direct current motor drive circuit according to any claim in claim 1 to 6, which is characterized in that institute
The power input for stating controller connects the anode of the power supply by the switch unit；Also, the ground connection of the controller
End is connect with the ground terminal of the cathode of the power supply, the switch unit, the three-phase metal-oxide-semiconductor driving circuit respectively；
After the switch unit switches to first closed state, the power supply stops powering to the controller.
10. a kind of BLDCM Drive System, including controller, three-phase metal-oxide-semiconductor driving circuit and brshless DC motor；Institute
The output end for stating controller is connect with the control signal of the three-phase metal-oxide-semiconductor driving circuit, the three-phase metal-oxide-semiconductor driving circuit
Output end connect with the brshless DC motor；It is characterized in that, the brushless direct current motor drive circuit further includes switch
Unit；The anode of power supply connects the power input of the three-phase metal-oxide-semiconductor driving circuit by the switch unit；The power supply
Cathode connect successively with the ground terminal of the switch unit, the three-phase metal-oxide-semiconductor driving circuit；
When operator needs the brshless DC motor to stop, the switch unit switches to the first closed state, and described three
Phase metal-oxide-semiconductor driving circuit powers off, also, the brshless DC motor, the switch unit and the three-phase metal-oxide-semiconductor driving circuit
Interior parasitic diode collectively forms circuit so that the brshless DC motor is braked.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017102256980 | 2017-04-07 | ||
| CN201710225698 | 2017-04-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208028798U true CN208028798U (en) | 2018-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820473718.6U Active CN208028798U (en) | 2017-04-07 | 2018-04-04 | brushless direct current motor drive circuit and system |
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| Country | Link |
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| CN (1) | CN208028798U (en) |
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2018
- 2018-04-04 CN CN201820473718.6U patent/CN208028798U/en active Active
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