CN108880359A - Bridge drive circuit, brushless motor control circuit and method, hair dryer - Google Patents
Bridge drive circuit, brushless motor control circuit and method, hair dryer Download PDFInfo
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- CN108880359A CN108880359A CN201810779002.3A CN201810779002A CN108880359A CN 108880359 A CN108880359 A CN 108880359A CN 201810779002 A CN201810779002 A CN 201810779002A CN 108880359 A CN108880359 A CN 108880359A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 8
- 241000883990 Flabellum Species 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 15
- 239000004065 semiconductor Substances 0.000 description 13
- 238000004804 winding Methods 0.000 description 9
- 238000007664 blowing Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses bridge drive circuit, brushless motor control circuit and methods, hair dryer, and wherein bridge drive circuit includes at least two parallel branches, and one end after parallel connection is connected to first voltage source, and the other end after parallel connection is connected to the second voltage source；Wherein at least one branch includes：First controllable switch, first end connect first voltage source；Second controllable switch, first end are connect with the second end of the first controllable switch, and the second end of the second controllable switch connects the second voltage source；The tie point of first controllable switch and the second controllable switch is connected to a control terminal of brushless motor；Diode, anode are connect with tertiary voltage source；The cathode of first capacitor, one end and diode connects, and the other end is connected to the tie point of the first controllable switch and the second controllable switch.Through the invention, when switching to the upper tube conducting in the branch in the case that down tube in branch is not turned on, upper tube can more steadily on or off under the influence of control signals.
Description
Technical field
The present invention relates to fields of home appliance technology, and in particular to bridge drive circuit, brushless motor control circuit and side
Method, hair dryer.
Background technique
The main part of hair dryer is made of one group of heating wire and one high revolving speed small fan.When blower operation, electric heating
Silk generates heat, and heat band chimney fan has been reformed into hot wind by the wind of high revolving speed fan blowout；If only high revolving speed small fan
Rotation and heating wire does not work, then what is produced by boasting is exactly cold wind.
Prior art discloses a kind of bridge drive circuits of brushless motor in hair dryer, as shown in Figure 1, metal-oxide-semiconductor Q1, Q2
Series connection forms the first branch, and metal-oxide-semiconductor Q3, Q4 connect to form second branch, and metal-oxide-semiconductor Q5, Q6 connect to form third branch；Three branch
Road is in parallel, and one end after parallel connection is connected to power supply VCC, the other end ground connection after parallel connection.U is connected between Q1, Q2, and V is connected to
Between Q3, Q4, W is connected between Q5, Q6, and U, V, W are respectively connected to the output end of rotational speed governor, to provide brushless motor institute
The speed controling signal needed.Hair dryer in actual use, alternately controls two conductings in six metal-oxide-semiconductors, two MOS of conducting
Pipe is not in same branch, and one of metal-oxide-semiconductor is the upper tube (close to the metal-oxide-semiconductor of VCC in branch) in branch, another
Metal-oxide-semiconductor is the down tube in another branch (close to the metal-oxide-semiconductor of power ground in branch).For example, successively controlling MOS according to following order
Pipe conducting：Q1Q6—Q1Q4—Q5Q4—Q5Q2—Q3Q2—Q3Q6—Q1Q6……
Inventors have found that brushless motor rotation situation is not when using the driving brushless motor operation of above-mentioned bridge drive circuit
Stablize.
Summary of the invention
In view of this, the embodiment of the invention provides bridge drive circuit, brushless motor control circuit and methods, blowing
Machine, when solving existing bridge drive circuit control brushless motor operation, the unstable problem of brushless motor rotation situation.
First aspect present invention provides a kind of bridge drive circuit, for controlling brushless motor rotation, including at least two
Branch, at least two branch circuit parallel connections, it is in parallel after one end be connected to first voltage source, it is in parallel after the other end be connected to
The second voltage source；The voltage of the first voltage source is higher than the second voltage source；Wherein, one at least two branches
Branch includes：First controllable switch, first end connect the first voltage source；Second controllable switch, first end and institute
The second end connection of the first controllable switch is stated, the second end of second controllable switch connects the second voltage source；Described
The second end of one controllable switch or the first end of second controllable switch are used to be connected to a control terminal of brushless motor；Two
Pole pipe, anode are connect with tertiary voltage source；The voltage in the tertiary voltage source is higher than the second voltage source；First capacitor,
One end is connect with the cathode of the diode, and the other end is connected to the second end of first controllable switch or described second can
Control the first end of switch.
Second aspect of the present invention provides a kind of brushless motor control circuit, including：The driving of bridge-type described in first aspect
Circuit；The control terminal of controller, first controllable switch and second controllable switch at least two branches is equal
It is connected to the controller.
Optionally, the brushless motor control circuit further includes：Sampling resistor, first end with it is described it is in parallel after the other end
Connection, second end are connect with the second voltage source；Sample rate current processing unit, one side are connected to the two of the sampling resistor
End, for obtaining the voltage at the sampling resistor both ends；The output end of the other side is connected to the controller；The sample circuit
Processing unit is used to obtain the sample rate current for flowing through the sampling resistor according to the voltage at the sampling resistor both ends.
Optionally, the second end of the first controllable switch described in every branch or the first end of second controllable switch be also
It is connected to the controller, obtains the voltage over zero in brushless motor for the controller.
Third aspect present invention provides the control method of brushless motor control circuit described in second aspect, including：Control
First controllable switch of the first branch processed is connected, while controlling the second controllable switch conducting of third branch, remaining controllable switch
It disconnects；The first controllable switch conducting of the first branch is controlled, while controlling the second controllable switch conducting of second branch, remaining can
Control switch disconnects；The first controllable switch conducting of third branch is controlled, while controlling the second controllable switch conducting of second branch,
Remaining controllable switch disconnects；The first controllable switch conducting of third branch is controlled, while controlling the second of the first branch and controllably opening
Conducting is closed, remaining controllable switch disconnects；The first controllable switch conducting of second branch is controlled, while controlling the second of the first branch
Controllable switch conducting, remaining controllable switch disconnect；The first controllable switch conducting of second branch is controlled, while controlling third branch
The second controllable switch conducting, remaining controllable switch disconnect.
Optionally, the control method further includes：Obtain the voltage over zero in brushless motor；In the voltage over zero
At the time of control next sequence controllable switch conducting.
Fourth aspect present invention provides a kind of hair dryer, including：Second aspect or second aspect any one optional reality
Brushless motor control circuit described in mode is applied, wherein the controller is used to execute the optional reality of the third aspect or the third aspect
Apply control method described in mode；Brushless motor and flabellum, the flabellum are mounted in the shaft of the brushless motor.
Optionally, the brushless motor is DC brushless motor.
Optionally, the hair dryer further includes：At least one set of heater strip, for generating heat；At least one heater strip control
Circuit processed, the corresponding one group of heater strip of each heating strip control circuit, corresponds to for being controlled according to the control instruction of the controller
Heater strip generate heat.
Optionally, the heating strip control circuit includes：Optocoupler, side are connect with controller；It is silicon-controlled, with one group of heating
Silk series connection is followed by the both ends of power supply；The silicon-controlled control terminal is connected to the other side of the optocoupler.
Bridge drive circuit provided by the embodiment of the present invention, brushless motor control circuit and method, hair dryer, by pre-
When determining each controllable switch of sequential control and sequentially turning on, when the down tube conducting in a branch, positive charge is from tertiary voltage source
One end of first capacitor in the branch is flowed to through diode, negative electrical charge flows in the branch from down tube of the second voltage source through being connected
The other end of first capacitor for first capacitor to charge；Down tube in the branch switches to the branch in the case where being not turned on
In upper tube conducting when, since the pin determination being connected in the pin of upper tube, with down tube is with low-voltage, upper tube can be
Control more steadily on or off under the action of signal.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 shows the schematic diagram of existing bridge drive circuit；
Fig. 2A shows a kind of circuit diagram of bridge drive circuit according to an embodiment of the present invention；
Fig. 2 B shows the stator winding wiring schematic diagram in brushless motor；
Fig. 3 A shows a kind of functional block diagram of brushless motor control circuit according to an embodiment of the present invention；
Fig. 3 B shows the functional block diagram of another brushless motor control circuit according to an embodiment of the present invention；
Fig. 4 shows a kind of circuit diagram of sample rate current processing unit；
Fig. 5 shows the second end of controllable switch or the first end of the second controllable switch and controller in every branch and connects
The circuit diagram connect；
Fig. 6 shows the flow chart of the control method of brushless motor control circuit shown in Fig. 3 A or Fig. 3 B；
Fig. 7 A shows a kind of circuit diagram of hair dryer according to the present invention；
Fig. 7 B shows the circuit diagram of another hair dryer according to the present invention；
Fig. 8 shows a kind of circuit diagram of heating strip control circuit.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Inventor has carefully studied the bridge drive circuit discovery of brushless motor in existing hair dryer, and brushless motor rotates feelings
The unstable reason of condition is：Down tube in a branch switches the upper tube conducting of the branch in the case of being not turned on when, meeting
Occur upper tube can not normally situation；And why upper tube can not be connected, and be in the pin due to upper tube, with down tube phase
Even pin floating and lead to its spread of voltage.Based on the discovery, a kind of bridge drive circuit is inventor provided, to solve
Brushless motor rotates unstable situation.
Embodiment one
Fig. 2A shows a kind of circuit diagram of bridge drive circuit according to an embodiment of the present invention.Bridge-type driving electricity
Road is for controlling brushless motor rotation.As shown in Figure 2 A, which includes at least two branches, at least two branch
Road is in parallel, and one end after parallel connection is connected to first voltage source V1, and the other end after parallel connection is connected to the second voltage source V2, the first electricity
Potential source V1 is higher than the second voltage source V2, such as V1 is positive voltage, and V2 is power ground.
A branch at least two branches, by taking the U branch in left side in Fig. 2A as an example, including the first controllable switch Q1,
Second controllable switch Q2, diode D1 and first capacitor C1.The first end of first controllable switch Q1 connects first voltage source V1, the
The first end of two controllable switch Q2 is connect with the second end of the first controllable switch Q1, the second end of the second controllable switch Q2 connection the
Two voltage source V2；The second end of first controllable switch Q1 or the first end of the second controllable switch Q2 are for being connected to brushless motor
One control terminal.The anode of diode D1 is connect with tertiary voltage source V3, and the voltage of tertiary voltage source V3 is higher than the second voltage source
V2.One end of first capacitor C1 is connect with the cathode of diode D1, the other end be connected to the first controllable switch Q1 second end or
The first end of second controllable switch Q2.Intermediate V branch the first controllable switch Q3 and the second controllable switch Q4 series connection in Fig. 2A,
Connection relationship is with U branch, the first controllable switch Q5 and the second controllable switch Q6 series connection, the same U of connection relationship in the W branch on right side
Branch.
Brushless motor is made of stator and rotor, and the magnetic field of direction change is generated by stator, is provided with permanent magnetism on rotor
Attraction power drive rotor rotation on body, changing magnetic field and rotor between permanent magnet.As shown in Figure 2 B, determine in brushless motor
Sub- winding mostly uses symmetrical wye connection, when the first controllable switch Q1 of U branch is connected, the second controllable switch Q4 of V branch
When conducting, electric current flows to V from the U in Fig. 2 B；And when the first controllable switch Q3 of V branch conducting, the second controllable switch of U branch
When Q2 is connected, electric current flows to U from the V in Fig. 2 B.
Using as described in Fig. 2A bridge drive circuit control brushless motor when, successively according to following order control it is each can
Control switch conduction：Q1Q6-Q1Q4-Q5Q4-Q5Q2-Q3Q2-Q3Q6-Q1Q6 ... from Q3, Q2 when being connected, U branch
Down tube (down tube in each embodiment of the application refers to the controllable switch close to first voltage source V1, and upper tube refers to close to second
The controllable switch of voltage source V2) conducting, electric current in the brushless motor U shown in Fig. 2A flows to the second voltage source V2 by Q2；
At the same time, positive charge also flows to one end of first capacitor C1 from tertiary voltage source V3 through diode D1, and negative electrical charge is electric from second
Potential source V2 flows to the other end of first capacitor C1 through Q2, to charge for first capacitor C1.When from Q3, Q6 conducting switch to Q1,
When Q6 is connected, the upper tube of U branch with first capacitor C1 due to connecting, and the other end of first capacitor C1 has full of negative electrical charge
Low-voltage, therefore the pin being connected in the pin of upper tube, with down tube is not hanging, upper tube can be relatively steady under the influence of control signals
Surely on or off.
Above-mentioned bridge drive circuit, when controlling each controllable switch by predetermined order and sequentially turning on, when in a branch
Down tube conducting when, positive charge flows to one end of first capacitor in the branch from tertiary voltage source through diode, and negative electrical charge is from the
Down tube of two voltage sources through being connected flows to the other end of first capacitor in the branch to charge for first capacitor；In the branch
Down tube be not turned in the case where switch in the branch upper tube conducting when, due to what is be connected in the pin of upper tube, with down tube
Pin, which determines, has low-voltage, therefore upper tube can more steadily on or off under the influence of control signals.
It should be added that parallel branch in the application can be three, but three are not limited to, such as can also be with
For two or any other number.The number of windings of the item number of parallel branch with specific reference to star-like connection in the stator of brushless motor
Amount (such as being 3 winding star-like connections in Fig. 2 B) determines.
Can be each branch in the application includes diode and first capacitor；Can also there was only individual branches includes two
Pole pipe and first capacitor, other branches, which can then use, to be solved the pin floating of the second controllable switch in branch otherwise, leads
The problem of causing its spread of voltage.
Controllable switch in the application can be metal-oxide-semiconductor, IGBT or other controllable switch devices, and application does not limit this
It is fixed.It can be the metal-oxide-semiconductor of N-channel as shown in Figure 2 A when controllable switch is metal-oxide-semiconductor.It will be appreciated by those skilled in the art that
For the grid G conducting for controlling metal-oxide-semiconductor, need to have qualified voltage difference between grid G and source S, it thus can be in grid
Resistance is connected between pole G and source S.
Embodiment two
Fig. 3 A shows a kind of functional block diagram of brushless motor control circuit according to an embodiment of the present invention.Such as Fig. 3 A institute
Show, which includes bridge drive circuit described in embodiment one, in addition, further including controller, embodiment
The control terminal of the first controllable switch and the second controllable switch in one branch is connected to controller.
As shown in Figure 3A, in Fig. 2A control terminal P1, the U branch of the first controllable switch Q1 of U branch the second controllable switch
The control terminal P4 of second controllable switch Q4 of control terminal P3, the V branch of the first controllable switch Q3 of control terminal P2, the V branch of Q2,
The control terminal P6 of second controllable switch Q6 of control terminal P5, the W branch of the first controllable switch Q5 of W branch is connected to control
Device.
Embodiment three
Fig. 3 B shows the functional block diagram of another brushless motor control circuit according to an embodiment of the present invention, such as Fig. 3 B institute
Show, the difference with embodiment two is, further includes sampling resistor Rs and sample rate current processing unit.
The first end of sampling resistor Rs is connect with the other end after parallel connection, and second end is connect with the second voltage source.Sampling electricity
The side of stream processing unit is connected to the both ends of sampling resistor Rs, for obtaining the voltage at the both ends sampling resistor Rs；The other side
Output end is connected to controller.Sample circuit processing unit is used to flow through sampling electricity according to the acquisition of the voltage at the both ends sampling resistor Rs
Hinder the sample rate current of Rs.Controller can control the rotation of brushless motor according to sample rate current, such as when sample rate current is excessive,
Brushless motor circuit is likely to occur failure, and controller can control brushless motor and stop operating.
Above-mentioned sampling resistor is arranged in the tie point after each branch circuit parallel connection and between the second voltage source, and institute is collected
Electric current is that (coil windings have time-lag action to electric current to the sum of electric current of each winding of star-like connection, therefore cut in brushless motor
When changing the controllable switch of conducting, will appear at least two-way electric current superposition in brushless motor), the sum of the electric current is greater than single winding
Electric current.When the electric current in single winding is excessive, sample rate current will necessarily be excessive, and when sample rate current is excessive, in single winding
Electric current may not be excessive, therefore more may be used according to the sampling resistor of the embodiment of the present application electric current collected to control brushless motor
It leans on.
It will be appreciated by those skilled in the art that the voltage at sampling resistor both ends is converted to, sample rate current can there are many electricity
The specific implementation form on road, sample rate current processing unit can use any one prior art means.Optionally, sample rate current
Processing unit is as shown in figure 4, wherein U1 is operational amplifier.
As a kind of optional embodiment of the present embodiment, the second end of controllable switch or second controllable in every branch
The first end of switch is additionally coupled to controller, obtains the voltage over zero in brushless motor for controller, as shown in Figure 3B.It can
Selection of land, the second end of controllable switch or the first end of the second controllable switch are connected by circuit as shown in Figure 5 in every branch
It is connected to controller.
Example IV
Fig. 6 shows the flow chart of the control method of brushless motor control circuit described in embodiment two or embodiment three.
As shown in fig. 6, this method comprises the following steps：
S1：The first controllable switch conducting of the first branch is controlled, while controlling the second controllable switch conducting of third branch,
Remaining controllable switch disconnects.As shown in Figure 2 A, control Q1, Q6 conducting, other controllable switches disconnect.
S2：The first controllable switch conducting of the first branch is controlled, while controlling the second controllable switch conducting of second branch,
Remaining controllable switch disconnects.
As shown in Figure 2 A, control Q1, Q4 conducting, other controllable switches disconnect.
S3：The first controllable switch conducting of third branch is controlled, while controlling the second controllable switch conducting of second branch,
Remaining controllable switch disconnects.
As shown in Figure 2 A, control Q5, Q4 conducting, other controllable switches disconnect.
S4：The first controllable switch conducting of third branch is controlled, while controlling the second controllable switch conducting of the first branch,
Remaining controllable switch disconnects.
As shown in Figure 2 A, control Q5, Q2 conducting, other controllable switches disconnect.
S5：The first controllable switch conducting of second branch is controlled, while controlling the second controllable switch conducting of the first branch,
Remaining controllable switch disconnects.
As shown in Figure 2 A, control Q3, Q2 conducting, other controllable switches disconnect.
S6：The first controllable switch conducting of second branch is controlled, while controlling the second controllable switch conducting of third branch,
Remaining controllable switch disconnects.
As shown in Figure 2 A, control Q3, Q6 conducting, other controllable switches disconnect.
By above-mentioned 6 steps, 6 controllable switches of controllable bridge drive circuit are successively connected according to following order：
Q1Q6-Q1Q4-Q5Q4-Q5Q2-Q3Q2-Q3Q6-Q1Q6 ... alternately controls two conductings in six controllable switches,
Two controllable switches of conducting are not in same branch, and one of controllable switch is the upper tube in branch, another metal-oxide-semiconductor
For the down tube in another branch.
As a kind of optional embodiment of the present embodiment, the control method of brushless motor control circuit also obtains brushless electricity
Voltage over zero in machine controls the controllable switch conducting of next sequence at the time of voltage over zero.
Embodiment five
Fig. 7 A shows a kind of circuit diagram of hair dryer according to the present invention.As shown in Figure 7 A, which includes
Brushless motor control circuit, brushless motor and flabellum described in embodiment two or embodiment three.Wherein, flabellum is mounted on brushless electricity
In the shaft of machine.Controller is for executing control method described in example IV or its any one optional embodiment.
Hair dryer can greatly reduce noise when operation using brushless motor, and revolving speed is up to 100000RPM.
Embodiment six
Fig. 7 B shows the circuit diagram of another hair dryer according to the present invention.As shown in Figure 7 B, with embodiment five
Difference be, further include at least one set of heater strip and at least one heating strip control circuit.Heater strip is for generating heat, often
The corresponding one group of heater strip of a heating strip control circuit generates heat for controlling corresponding heater strip according to the control instruction of controller
Amount.When brushless motor drives flabellum rotation to be formed by wind for the band chimney fan of heat caused by heater strip, blowout is exactly
Hot wind；When heater strip does not generate heat, blowout is exactly cold wind.
It will be appreciated by those skilled in the art that the specific implementation form of heating strip control circuit can be existing using any one
There is technological means.Optionally, as shown in figure 8, heating strip control circuit includes optocoupler M1 and silicon-controlled M2.The side of optocoupler M1 with
Controller connection, silicon-controlled M2 connect with one group of heater strip H1 or H2 be followed by power supply both ends (such as can be alternating current zero
Line and firewire), the control terminal of silicon-controlled M2 is connected to the other side of optocoupler M1.
At least two heater strips are controlled respectively by the heated silk control circuit of controller, can select to produce according to input signal
The quantity of the heater strip of heat amount, so as to control the temperature of Hairdryer.
Optionally, hair dryer can also include key, connect with controller, blown for user's input control signal with adjusting
The temperature of blower blowing, and the speed of control brushless motor rotation.In addition, hair dryer can also include indicator light, with control
Device connection, for showing the working condition of hair dryer, can specifically customize according to actual needs.
It should be added that the identical position of label is connected on conducting wire in each attached drawing of the application.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case where various modifications and variations can be made, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (10)
1. a kind of bridge drive circuit, for controlling brushless motor rotation, which is characterized in that described including at least two branches
At least two branch circuit parallel connections, one end after parallel connection are connected to first voltage source, and the other end after parallel connection is connected to the second voltage source；
The voltage of the first voltage source is higher than the second voltage source；Wherein, a branch at least two branches includes：
First controllable switch, first end connect the first voltage source；
Second controllable switch, first end are connect with the second end of first controllable switch, and the of second controllable switch
Two ends connect the second voltage source；The second end of first controllable switch or the first end of second controllable switch are used for
It is connected to a control terminal of brushless motor；
Diode, anode are connect with tertiary voltage source；The voltage in the tertiary voltage source is higher than the second voltage source；
First capacitor, one end are connect with the cathode of the diode, and the other end is connected to the second of first controllable switch
The first end of end or second controllable switch.
2. a kind of brushless motor control circuit, which is characterized in that including：
Bridge drive circuit described in claim 1；
The control terminal of controller, first controllable switch and second controllable switch at least two branches connects
It is connected to the controller.
3. brushless motor control circuit according to claim 2, which is characterized in that further include：
Sampling resistor, first end are connect with the other end after the parallel connection, and second end is connect with the second voltage source；
Sample rate current processing unit, one side are connected to the both ends of the sampling resistor, for obtaining the sampling resistor both ends
Voltage；The output end of the other side is connected to the controller；The sample circuit processing unit is used for according to the sampling electricity
The voltage at resistance both ends obtains the sample rate current for flowing through the sampling resistor.
4. brushless motor control circuit according to claim 2, which is characterized in that first controllably opens described in every branch
The second end of pass or the first end of second controllable switch are additionally coupled to the controller, obtain for the controller brushless
Voltage over zero in motor.
5. according to the control method of the described in any item brushless motor control circuits of claim 2 to 4, which is characterized in that including：
The first controllable switch conducting of the first branch is controlled, while controlling the second controllable switch conducting of third branch, remaining can
Control switch disconnects；
The first controllable switch conducting of the first branch is controlled, while controlling the second controllable switch conducting of second branch, remaining can
Control switch disconnects；
The first controllable switch conducting of third branch is controlled, while controlling the second controllable switch conducting of second branch, remaining can
Control switch disconnects；
The first controllable switch conducting of third branch is controlled, while controlling the second controllable switch conducting of the first branch, remaining can
Control switch disconnects；
The first controllable switch conducting of second branch is controlled, while controlling the second controllable switch conducting of the first branch, remaining can
Control switch disconnects；
The first controllable switch conducting of second branch is controlled, while controlling the second controllable switch conducting of third branch, remaining can
Control switch disconnects.
6. the control method of brushless motor control circuit according to claim 5, which is characterized in that further include：
Obtain the voltage over zero in brushless motor；
The controllable switch conducting of next sequence is controlled at the time of the voltage over zero.
7. a kind of hair dryer, which is characterized in that including：
The described in any item brushless motor control circuits of claim 2 to 4, wherein the controller requires 5 for perform claim
Or control method described in 6；
Brushless motor and flabellum, the flabellum are mounted in the shaft of the brushless motor.
8. hair dryer according to claim 7, which is characterized in that the brushless motor is DC brushless motor.
9. hair dryer according to claim 7, which is characterized in that further include：
At least one set of heater strip, for generating heat；
At least one heating strip control circuit, the corresponding one group of heater strip of each heating strip control circuit, for according to the control
The control instruction of device controls corresponding heater strip and generates heat.
10. hair dryer according to claim 9, which is characterized in that the heating strip control circuit includes：
Optocoupler, side are connect with controller；
It is silicon-controlled, it connects and is followed by the both ends of power supply with one group of heater strip；The silicon-controlled control terminal is connected to the optocoupler
The other side.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810734344 | 2018-07-06 | ||
| CN2018107343443 | 2018-07-06 |
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| Publication Number | Publication Date |
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| CN108880359A true CN108880359A (en) | 2018-11-23 |
| CN108880359B CN108880359B (en) | 2024-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810779002.3A Active CN108880359B (en) | 2018-07-06 | 2018-07-16 | Bridge type driving circuit, brushless motor control circuit and method, and blower |
| CN201821122133.6U Withdrawn - After Issue CN208723818U (en) | 2018-07-06 | 2018-07-16 | Bridge drive circuit, brushless motor control circuit, hair dryer |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821122133.6U Withdrawn - After Issue CN208723818U (en) | 2018-07-06 | 2018-07-16 | Bridge drive circuit, brushless motor control circuit, hair dryer |
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| CN (2) | CN108880359B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880359B (en) * | 2018-07-06 | 2024-09-03 | 苏州市纽莱克电子科技有限公司 | Bridge type driving circuit, brushless motor control circuit and method, and blower |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4359626A (en) * | 1980-03-18 | 1982-11-16 | Potter Bronson M | Electric blanket heating control with capacitance sensing |
| CN1197325A (en) * | 1997-03-19 | 1998-10-28 | 威斯特伐利亚工具股份有限公司 | Control device of d. c. dynamo driven by two-phase power line from a.c. electrified wire netting |
| CN1845651A (en) * | 2006-03-21 | 2006-10-11 | 横店得邦电子有限公司 | Positive feedback abnormal protection circuit |
| CN206237652U (en) * | 2016-10-21 | 2017-06-09 | 上海与德信息技术有限公司 | Flash control circuit and mobile terminal |
| CN208723818U (en) * | 2018-07-06 | 2019-04-09 | 苏州市纽莱克电子科技有限公司 | Bridge drive circuit, brushless motor control circuit, hair dryer |
-
2018
- 2018-07-16 CN CN201810779002.3A patent/CN108880359B/en active Active
- 2018-07-16 CN CN201821122133.6U patent/CN208723818U/en not_active Withdrawn - After Issue
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4359626A (en) * | 1980-03-18 | 1982-11-16 | Potter Bronson M | Electric blanket heating control with capacitance sensing |
| CN1197325A (en) * | 1997-03-19 | 1998-10-28 | 威斯特伐利亚工具股份有限公司 | Control device of d. c. dynamo driven by two-phase power line from a.c. electrified wire netting |
| CN1845651A (en) * | 2006-03-21 | 2006-10-11 | 横店得邦电子有限公司 | Positive feedback abnormal protection circuit |
| CN206237652U (en) * | 2016-10-21 | 2017-06-09 | 上海与德信息技术有限公司 | Flash control circuit and mobile terminal |
| CN208723818U (en) * | 2018-07-06 | 2019-04-09 | 苏州市纽莱克电子科技有限公司 | Bridge drive circuit, brushless motor control circuit, hair dryer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN208723818U (en) | 2019-04-09 |
| CN108880359B (en) | 2024-09-03 |
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