CN107800336A - Motor and its drive circuit, application apparatus and motor braking method - Google Patents
Motor and its drive circuit, application apparatus and motor braking method Download PDFInfo
- Publication number
- CN107800336A CN107800336A CN201610800679.1A CN201610800679A CN107800336A CN 107800336 A CN107800336 A CN 107800336A CN 201610800679 A CN201610800679 A CN 201610800679A CN 107800336 A CN107800336 A CN 107800336A
- Authority
- CN
- China
- Prior art keywords
- motor
- circuit
- inverter
- drive circuit
- microprocessor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
Abstract
The present invention provides a kind of motor and its drive circuit, application apparatus and motor braking method, the drive circuit includes an inverter, one brake unit, one microprocessor and a motor, wherein, the inverter is set to direct current energy being converted to threephase AC electric energy, the brake unit includes a sample circuit, one discharge circuit and an interlock switch group, the brake unit is used to notify the magnitude of voltage size and making with preset voltage value of inverter both end voltage when microprocessor detects emergency to compare when emergency occurs, when detecting that the inverter both end voltage value is more than preset voltage value, the microprocessor sends a signal to controlling switch to turn on the discharge circuit, make capacitor and inverter that over-pressed danger be reduced or eliminated.The drive circuit have it is simple in construction, be quick on the draw, brake the characteristics of rapid, and also can guarantee that stable performance while reduce cost.
Description
Technical field
The present invention relates to Motor Control Field, more particularly to it is capable of the motor and its motor-drive circuit of fast braking, makes
With the application apparatus and motor braking method of the motor.
Background technology
Food processor such as juice extractor, cooking machine, are the utensils being commonly used in people's daily life.Food processor is more
Rotated using motor driven cutter at high speeds, food is cut.But this processing mode can bring the hidden danger of secure context, such as
Covered on accidentally being opened during fruit use, motor and cutter can not stop in time, and user may be damaged.It is international
Required in the electrician committee (IEC) safety requirements standard in emergency circumstances, when being opened or remove such as the upper lid of food processor,
The blade of food processor needs to stop in 1.5 seconds.Many food processors currently used in the market can not meet IEC's
Safety requirements standard, before some food processors are left the motor off by special machinery setting in addition, lid can not be opened, but
This will increase the cost of food processor.
And on food processor lid be opened suddenly and cause motor suddenly it is out of service during, motor because be used to
Property continue rotation and caused regeneration energy can make capacitor and inverter has the danger of overvoltage, if things go on like this infringement motor is driven
The life-span of dynamic circuit interior element.
The content of the invention
In view of this, the present invention provides a kind of motor-drive circuit.The motor-drive circuit includes a dc source, one
Inverter, a motor, a brake unit and a microprocessor；The inverter, which has, is respectively connecting to a direct current both ends of power
Electrode input end and negative input, it is characterised in that the brake unit includes a sample circuit, a discharge circuit and a company
Lock-switch group, the microprocessor is connected with the sample circuit, the discharge circuit and the interlock switch group respectively, described
Microprocessor monitors whether emergency occurs by the interlock switch group, detects emergency by the sample circuit and sends out
The size of the inverter both end voltage and one detected value of acquisition when raw, by the detected value and a preset voltage value or default electricity
Pressure scope is made comparisons, when the detected value is more than the preset voltage value or beyond the predetermined voltage range, micro- place
Manage device and send the control signal conducting discharge circuit, so that the discharge circuit operating discharge.
The present invention separately provides a kind of application apparatus with motor as described above.
The present invention separately provides a kind of motor braking method for motor-drive circuit as described above
Motor-drive circuit provided in an embodiment of the present invention uses power resistor, can consume motor because inertia continues to rotate
And caused regeneration energy, the over-pressed risk of capacitor and inverter is reduced or eliminated, and the circuit has relatively
Low cost, it is simple in construction, be quick on the draw, brake the characteristics of rapid.
Brief description of the drawings
In accompanying drawing：
Fig. 1 shows the food processor of one embodiment of the invention；
Fig. 2 shows the circuit diagram of the motor-drive circuit of one embodiment of the invention；
Fig. 3 shows the workflow diagram of food processor in case of emergency motor-drive circuit.
Main element symbol description
Following embodiment will combine above-mentioned accompanying drawing and further illustrate the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.Use with reference to explanation it is appreciated that accompanying drawing only provides, be not used for this hair
It is bright to be any limitation as.The connection shown in accompanying drawing is only to be described for ease of clear, and does not limit connected mode.
It should be noted that when a component is considered as " connection " another component, it can be directly to separately
One component may be simultaneously present component placed in the middle.Unless otherwise defined, all technologies used herein and section are academic
Language is identical with belonging to the implication that the those skilled in the art of the present invention are generally understood that.Herein in the description of the invention
Used term is intended merely to describe the purpose of specific embodiment, it is not intended that in the limitation present invention.
Fig. 1 shows the food processor of one embodiment of the invention.As shown in figure 1, a kind of food processor include upper lid 10,
Cutter 12, pedestal 14 and switch 16.Wherein, the interlock switch 161 in the coordinated signals motor-drive circuit of upper lid 10 is (see figure
Shown in 2)；It is different according to job category, the cutter 12 may include piece cutting knife, hole cutting knife, reamer, cross-shaped knife, noodles lipper and
Agitator etc.；Motor and its drive circuit are installed inside the pedestal 14；The switch 16 is set to be available for user to carry out
Command selection.
Fig. 2 shows the circuit diagram of the motor-drive circuit of an embodiment of the present invention.As shown in Fig. 2 the motor driving
Circuit includes：One inverter 110, a motor 120, a brake unit 130 and a microprocessor 170.The inverter 110 is set
It is set to and direct current energy is converted into threephase AC electric energy；The brake unit 130 is set to occur to combine institute during emergency
Microprocessor 170 is stated, so that the motor 120 is caused before decommissioning and told motor 120 being stopped to regenerate energy (electricity
Can) electric discharge；The motor 120 is such as brush DC (BLDC) motor.
The motor-drive circuit also includes an ac-dc converter circuit 100, and the ac-dc converter circuit 100 includes one
AC power 101, a rectifier 103, a switch block 104 and a capacitor 105.The AC power 101 is used to provide
Alternating current, the alternating current can be commercial alternating current (110V/220V).The rectifier 103 is set to from described
The alternating current of AC power 101 is integrated into direct current, and the rectifier 103 can be a diode bridge rectifier；It is described to open
Close part 104 be a single-pole double-throw relay, the switch block 104 have one be connected with the rectifier 103 first
The 3rd contact 104c that contact 104a, one second contact 104b and one are connected with the output end of the AC power 101.
The capacitor 105 is connected to the output end of the rectifier；The dc source separately also includes a fuse 102.
The inverter 110 is a three-phase bridge type converter, and the inverter 110 is set to from the capacitor
105 direct current is converted into the alternating current with three-phase and multi-frequency；The inverter 110 include three respectively with the electricity
The inverter circuit 111 in parallel of container 105；Two inversion elements 112 and one that each inverter circuit 111 includes series connection export
End, the output end are connected between the inversion element 112 of series connection.Each inversion element 112 includes the crystalline substance being connected in parallel
Body pipe 112a and diode 112b.
The motor 120 includes a threephase AC electric energy incoming end 121, and the threephase AC electric energy incoming end 121 is distinguished
The output end of each inverter circuit 111 is connected to, so that the motor 120 receives the exchange three from the inverter 110
Mutually electricity.
The brake unit 130 includes a sample circuit 140, a discharge circuit 150 and an interlock switch group 160.It is described
Sample circuit 140 includes at least two resistance, and resistance number is three in the present embodiment, respectively resistance R3, resistance R4 and resistance
R5, the resistance R3-R5 are connected in series to form resistance group, and the resistance group is connected in parallel in the capacitor 105
Both ends.The discharge circuit 150 includes a power resistor 151 and a controlling switch 152, and the controlling switch can be one
IGBT, described one end of power resistor 151 are connected with an input of inverter 110, the power resistor 151 it is another
End is connected with the colelctor electrode of the IGBT, and the emitter stage of the IGBT is connected with another input of the inverter.Institute
Stating interlock switch group 160 includes an interlock switch 161, a single-pole double-throw relay coil 162 and resistance R1 and resistance R2, described
Interlock switch 161 and the single-pole double-throw relay coil 162 are connected in series between a power end and an earth terminal, the electricity
The both ends of the single-pole double-throw relay coil 162 are connected in parallel in after resistance R1 and resistance R2 series connection again.
The microprocessor 170 includes three connectivity ports, respectively the first connectivity port 170a, second connection end mouth
170b and the 3rd connectivity port 170c.The first connectivity port 170a is with resistance R1, R2's in the interlock switch group 160
Concatenation point is connected, be set to detect the interlock switch 161 state and transmission level signal to the microprocessor
170.The second connection end mouth 170b is connected between any two resistance in the sample circuit 140, is set to examine
Survey the inverter both end voltage value size and be transferred to the microprocessor 170.The 3rd connectivity port 170c with it is described
The base stage of the IGBT in discharge circuit 150 is connected, be set to by the control signal of the microprocessor 170 transmit to
IGBT turns on the purpose of discharge circuit 150 to reach.
Motor-drive circuit working condition is when food processor is in normal operation：First, lid 10 on food processor
Close, interlock switch 161 keeps connection status, and now the 3rd contact 104c of switch block 104 contacts with the first contact 104a
So that the AC energy provided from AC power 101 can be delivered to inverter via direct current energy is formed after the rectification of rectifier 103
110, and make its charging into capacitor 105.Meanwhile first connectivity port 170a detect interlock switch 161 close after with
Conveying high level to microprocessor 170, the conveying of microprocessor 170 operating pwm signal to the inverter 110 makes it by direct current
Electric energy is converted to threephase AC electric energy, so as to provide required threephase AC electric energy to motor 120, rotates the motor 120.
Wherein, the sampled voltage that second connection end mouth 170b to inverter both end voltage detect and will detect in real time
Value (detected value) is delivered to microprocessor 170, and the microprocessor 170 is by the detected value and a preset voltage value with presetting electricity
Whether pressure scope is compared to judge capacitor 105 and inverter 110 in over-pressed precarious position.
The working condition of food processor in case of emergency motor-drive circuit is：It is if worked in food processor
Cheng Zhong, when lid 10 is opened suddenly or removed thereon, interlock switch 161 is triggered to off-state, now switch block 104
3rd contact 104c is contacted with the second contact 104b, and the input power of motor 120 is cut off.Meanwhile the first connectivity port 170a
Detect that interlock switch 161 conveys low level to microprocessor 170, the conveying of the microprocessor 170 braking pwm signal after disconnecting
It is out of service with controlled motor 120 to inverter 110.By second connection end mouth 170b by the sampling at the inverter both ends detected
Magnitude of voltage (detected value) is delivered to the microprocessor 170 and made comparisons with preset voltage value therein or predetermined voltage range,
When the detected value is more than the preset voltage value or during beyond the predetermined voltage range, the microprocessor 170 passes through the
Three connectivity port 170c send control signal to controlling switch 152 turns on the discharge circuit 150, now the motor 120
Continue rotation by inertia to be consumed by the resistance of power resistor 151 and the caused renewable sources of energy so that capacitor 105
It is reduced or eliminated with the over-pressed risk of inverter 110.
Fig. 3 shows the workflow diagram of food processor in case of emergency motor-drive circuit.Referring to accompanying drawing 3, eating
In the thing processing machine course of work, when the situation that lid 10 is opened suddenly or removed on food processor occurs, motor-drive circuit
Perform following steps：
Step S301：Detect the interlock switch 161 and be triggered to off-state.In the present embodiment, food adds
Interlock switch 161 described in the coordinated signals of upper lid 10 of work machine, the interlock switch 161 are closed form in normal operation
State, when lid 10 is opened suddenly or removed in generation emergency such as food processor, interlock switch 161 is triggered to disconnection
State；
Step S303：Switch block 104 is disconnected, makes the dc source stop powering to the motor 120.In this implementation
In mode, by controlling the dead electricity of single-pole double-throw relay coil 162, the interlock switch 161 controls the switch block
104 disconnect the electrical connection between the rectifier 103 and AC power 101, power off motor 120；
Step S305：The both end voltage value of inverter 110 is detected to obtain a detected value.In the present embodiment, lead to
Cross microprocessor 170 and detect inverter both end voltage value；
Step S307：The detected value compared with a preset voltage value or predetermined voltage range and is judged whether big
In the preset voltage value or more than the predetermined voltage range.In the present embodiment, if the detected value is more than described pre-
If magnitude of voltage or during more than the predetermined voltage range, step S309 is continued executing with；If the detected value is less than or equal to described
Preset voltage value or during not less than the predetermined voltage range, then perform step S311；
Step S309：One suitable PWM duty cycle parameter of setting simultaneously sends the PWM ripples of the PWM duty cycle parameter extremely
The controlling switch 152, to turn on discharge circuit electric discharge.In the present embodiment, the microprocessor 170 sends control signal
To the break-make of the controlling switch 152, the PWM duty cycle parameter and motor shut down energy, required downtime with
And the peak power of adding thermal resistance is related to peak point current.The rotating speed for shutting down energy and motor of motor, rotor inertia and negative
It is directly proportional to carry inertia.It is appreciated that when motor shutdown energy is bigger, the downtime of requirement is shorter, adding thermal resistance its peak work
Rate and peak point current get over hour, it is necessary to which the pwm control signal of more big space rate, i.e., make the controlling switch within the unit interval
The time of 152 conductings is longer；
Step S311：Judge whether motor has decommissioned.If motor has decommissioned, flow terminates；If motor
Also continuing to operate, then returning and continue operating procedure S307.
In the present embodiment, the power supply of motor 120 is automatically cut off by drive circuit, is needed not move through microprocessor 170 and is controlled,
To ensure that even if microprocessor 170 is not normal, the motor 120 also will not continue to operate, and improve the safety guarantee of user.And
And the time for performing the flow is very short, the dwell time of the motor 120 can be reduced to 1.0s or within, fully meet
IEC safety requirements standard.
As described above, a kind of motor-drive circuit provided by the invention, wherein circuit element are simple, simple for structure and need not
The safety guards of the extra means as food processor such as complicated and expensive hammerlock are used, so that the cost phase of product
To reducing.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (19)
1. a kind of motor-drive circuit, including：
One dc source, an inverter, a motor, a brake unit and a microprocessor；The inverter has to be connected respectively
To the electrode input end and negative input of a direct current both ends of power, it is characterised in that the brake unit includes a sampling electricity
Road, a discharge circuit and an interlock switch group, the microprocessor respectively with the sample circuit, the discharge circuit and described
Interlock switch group connects, and the microprocessor monitors whether emergency occurs by the interlock switch group, is adopted by described
Sample electric circuit inspection emergency occur when the inverter both end voltage size and obtain a detected value, by the detected value with
One preset voltage value or predetermined voltage range are made comparisons, and are more than the preset voltage value or beyond described default in the detected value
During voltage range, the microprocessor sends control signal and turns on the discharge circuit, so that the discharge circuit operating discharge.
2. motor-drive circuit as claimed in claim 1, it is characterised in that the motor-drive circuit includes an alternating current-direct current
Change-over circuit, the ac-dc converter circuit include a switch block, a rectifier and a capacitor；The switch block is used for
The connection of rectifier and external ac power source is controlled, the rectifier is set to carry out the electric energy from external ac power source
Rectification simultaneously provides the dc source；The capacitor is connected to the output end of the rectifier.
3. motor-drive circuit as claimed in claim 2, it is characterised in that the switch block is a single-pole double throw relay
Device, it includes a coil and one first contact, one second contact, one the 3rd contact, exchange described in the 3rd contact portion
Power supply, the 3rd contact and the first contact are turned on, make the circuit turn-on between the AC power and the rectifier, turn on institute
Stating the 3rd contact and the second contact disconnects the circuit between the AC power and the rectifier.
4. motor-drive circuit as claimed in claim 3, it is characterised in that the inverter include it is multiple respectively with the electricity
Container inverter circuit in parallel, each inverter circuit have multiple inversion elements, and each inversion element includes parallel connection
The transistor and diode of connection, the motor have a threephase AC electric energy incoming end, the threephase AC electric energy of the motor
Incoming end connects the output end of the multiple inverter circuit respectively, and the output end of each inverter circuit is connected to the inversion
Between the inversion element of circuit.
5. motor-drive circuit as claimed in claim 4, it is characterised in that the sample circuit includes at least two series electricals
Resistance, the series resistance are parallel to the both ends of the capacitor.
6. motor-drive circuit as claimed in claim 5, it is characterised in that the discharge circuit includes a controlling switch and one
The both ends of the inverter are then parallelly connected with after power resistor, the controlling switch and power resistor series connection.
7. motor-drive circuit as claimed in claim 3, it is characterised in that the interlock switch group include an interlock switch,
The single-pole double-throw relay coil and two series resistances, the interlock switch are connected company with the single-pole double-throw relay coil
It is connected between a power end and an earth terminal, two series resistance is parallel to the both ends of the single-pole double-throw relay coil.
8. motor-drive circuit as claimed in claim 7, it is characterised in that the microprocessor is by detecting two series connection
The current potential of resistance judges the on off operating mode of interlock switch.
9. motor-drive circuit as claimed in claim 8, it is characterised in that the microprocessor includes one first connection end
Mouth, a second connection end mouth and one the 3rd connectivity port, first connectivity port are connected with the interlock switch group, so that
The microprocessor can detect whether emergency occurs by the interlock switch group, and the second connection end mouth is adopted with described
Sample circuit is connected, so that the microprocessor can obtain the inverter two when emergency occurs by the sample circuit
The detected value of terminal voltage, the 3rd connectivity port is connected with the controlling switch in the discharge circuit, with described
Detected value controls the conducting of the controlling switch when exceeding the preset voltage value or predetermined voltage range, make the discharge circuit
Work.
10. motor-drive circuit as claimed in claim 9, it is characterised in that upon occurrence of an emergency situation, the interlock switch
Group controls the switch portion by the single-pole double-throw relay coil, to disconnect the electricity between the rectifier and AC power
Connection.
11. a kind of motor, including stator, rotor and the motor-drive circuit as any one of claim 1-10.
12. motor as claimed in claim 11, it is characterised in that described motor is BLDC motors.
A kind of 13. application apparatus with the motor as any one of claim 11-12.
14. application apparatus as claimed in claim 13, it is characterised in that the application apparatus is food processor.
A kind of 15. motor braking method for motor-drive circuit as claimed in claim 1, it is characterised in that the side
Method comprises the following steps：
The interlock switch detected in the brake unit is triggered to off-state；
When the interlock switch is off, the dc source is set to stop powering to the motor；
The inverter both end voltage value is detected to obtain a detected value；
By the detected value compared with a preset voltage value or predetermined voltage range；
When the detected value is more than the preset voltage value or more than the predetermined voltage range, send a control signal to described
Controlling switch turns it on.
16. motor braking method as claimed in claim 15, it is characterised in that be less than or equal in the detected value described pre-
If magnitude of voltage or during not less than the predetermined voltage range, the detecting step is returned.
17. motor braking method as claimed in claim 15, it is characterised in that the detecting step, comparison step and hair
The step of sending control signal is performed by the microprocessor.
18. motor braking method as claimed in claim 17, it is characterised in that also including step：In the interlock switch quilt
During triggering, braking pwm signal is sent to the inverter, with to the motor braking.
19. motor braking method as claimed in claim 18, it is characterised in that it is described send braking pwm signal the step of by
The microprocessor performs.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610800679.1A CN107800336A (en) | 2016-09-01 | 2016-09-01 | Motor and its drive circuit, application apparatus and motor braking method |
| DE102017119932.2A DE102017119932A1 (en) | 2016-09-01 | 2017-08-30 | Motor driver circuit, application device comprising this and braking method for a motor |
| US15/692,256 US10554156B2 (en) | 2016-09-01 | 2017-08-31 | Motor driving circuit, application device including the same, and braking method for a motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610800679.1A CN107800336A (en) | 2016-09-01 | 2016-09-01 | Motor and its drive circuit, application apparatus and motor braking method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107800336A true CN107800336A (en) | 2018-03-13 |
Family
ID=61530549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610800679.1A Pending CN107800336A (en) | 2016-09-01 | 2016-09-01 | Motor and its drive circuit, application apparatus and motor braking method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107800336A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112072190A (en) * | 2019-06-10 | 2020-12-11 | 聚鼎科技股份有限公司 | Secondary battery and protective element thereof |
| CN113938059A (en) * | 2021-09-15 | 2022-01-14 | 荣耀终端有限公司 | Drive control device of brushless motor and related equipment |
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| US5405096A (en) * | 1993-01-16 | 1995-04-11 | Seol; Yong-Seok | Multipurpose pulverizer |
| JPH07245964A (en) * | 1994-02-28 | 1995-09-19 | Toshiba Corp | Inverter device |
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| US5405096A (en) * | 1993-01-16 | 1995-04-11 | Seol; Yong-Seok | Multipurpose pulverizer |
| JPH07245964A (en) * | 1994-02-28 | 1995-09-19 | Toshiba Corp | Inverter device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112072190A (en) * | 2019-06-10 | 2020-12-11 | 聚鼎科技股份有限公司 | Secondary battery and protective element thereof |
| CN113938059A (en) * | 2021-09-15 | 2022-01-14 | 荣耀终端有限公司 | Drive control device of brushless motor and related equipment |
| WO2023040639A1 (en) * | 2021-09-15 | 2023-03-23 | 荣耀终端有限公司 | Drive control device for brushless motor and related device |
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