CN106169736A - A kind of brshless DC motor quick rotation-clogging protection method and circuit - Google Patents
A kind of brshless DC motor quick rotation-clogging protection method and circuit Download PDFInfo
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- CN106169736A CN106169736A CN201610877393.3A CN201610877393A CN106169736A CN 106169736 A CN106169736 A CN 106169736A CN 201610877393 A CN201610877393 A CN 201610877393A CN 106169736 A CN106169736 A CN 106169736A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0856—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
Abstract
The present invention discloses a kind of method being applicable to the quick rotation-clogging protection of brshless DC motor and circuit.The parts such as the method is amplified by current sampling, signal, threshold value arranges and compares, rest-set flip-flop, protection blocking, protection unblock form, and wherein, protection solves latching segment and is made up of logic circuits such as monostable flipflop, electrification reset circuit, NAND gate again.After system power-on reset, rest-set flip-flop is in 0 state, and motor normally works；And when, after motor rotation blockage, its electric current raises rapidly, export high level after comparing with protection threshold value via the signal after current sampling and amplification and rest-set flip-flop is put 1, motor PWM signal is blocked, and is rapidly reached rotation-clogging protection；When commutation signal occurs convertible, monostable flipflop produce reset pulse, and rest-set flip-flop is set to 0 so that protection unlocks, and motor is in normal operating conditions.Circuit of the present invention is simple, protection is quick, and the protection startup time, less than 100 μ s, can be greatly improved motor safety in operation.
Description
Technical field
The present invention relates to a kind of motor rotation blockage guard method and circuit, particularly relate to a kind of quick stall of brshless DC motor
Guard method and circuit.
Background technology
Brshless DC motor refers to brushless and diverter (or collector ring) the motor using DC source to drive, typically
By motor body be internally integrated driver and form, being a kind of typical electromechanical integrated product, it has Traditional DC electricity
The advantage of machine, eliminates again carbon brush, slip ring structure simultaneously, does not produce spark, reliable operation, and the life-span is long, is widely used in vapour
The fields such as car, instrument, Industry Control and Aero-Space, have also given play to greater advantage in automatic door and window control.
But, when brshless DC motor is applied to automatic door and window and relevant control field, when machinery moves to spacing
Or run into barrier in running and during stall, as not in time, promptly locking motor cancel output torque, then not only result in
Motor and the damage of machinery, and user may be caused personal injury, as health extrudes, crushes.General
Mechanical position limitation protection device have employed mechanical type proximity switch, but proximity switch limited lifetime, toggle speed is slow, and can not
Protection machinery runs the stall in way；And test through inventor, general electronic protection (includes motor internal collection
Become the current foldback circuit of driver) it is difficult to the quick rotation-clogging protection to automatic door and window control brshless DC motor, nothing
Method meets safety, reliability requirement.
The brshless DC motor that general band is internally integrated driver is controlled by 5 lead-in wires, is that power line V+ is (red respectively
Color), ground wire GND (black), direction controlling line CW/CCW (yellow, high level rotate forward, low level invert), control speed governing line PWM
(high level is forbidden, low level enables), tachometer pulse holding wire PUSLE (green).More existing brushed DC motor electronics
Protection device have employed stream trigger protection, deenergization, and reversely energising unlocks the pattern of protection, and from brshless DC motor
Control lead-in wire composition and control mode on visible, brshless DC motor power line V+ and ground wire GND can not reversely be energized, so
This pattern cannot be applicable to brshless DC motor protection, and the pattern that the present invention is considered as was stream trigger protection, and direction is controlled
Line CW/CCW processed upset unlocks the protected mode of protection.
Summary of the invention
Present invention solves the technical problem that and be to provide a kind of brshless DC motor quick rotation-clogging protection method and circuit, such as figure
Shown in 1, by between this circuit module access controller and brshless DC motor, brshless DC motor is at any situation generation stall
Time, all with the startup time less than 100 μ s, motor can quickly be protected, cancel output torque, locking motor, until direction
Unlocking motor when control signal occurs to overturn, thus improve the safety in operation of the machinerys such as automatic door and window.
In order to solve described technical problem, the method by simulate and the detection of digital circuit locked rotor current, protection act,
The protection function such as unblock, as in figure 2 it is shown, specifically amplified by current sampling, signal, threshold value arranges and compares, rest-set flip-flop, protection
The part compositions such as locking, protection unblock, wherein, protection solves latching segment again by monostable flipflop, electrification reset circuit, NAND gate
Constitute Deng logic circuit.
As in figure 2 it is shown, motor drive current is carried out by the method by being connected on the resistance of DC brushless motor electric power loop
Sampling, and amplify and comparator through analogue signal, to compare with protection threshold voltage to produce afterwards to protect and trigger signal, protection triggers
Signal is connected to rest-set flip-flop S end, and another protected unlocking signal is connected to rest-set flip-flop R end.The specific works principle of protection circuit
With process it is:
After a, system power-on reset, rest-set flip-flop Q end is in 0 state, and motor normally works；
B and when, after motor rotation blockage, its electric current raises rapidly, via current sampling and amplify after signal with protection threshold value
Exporting high level after comparing and rest-set flip-flop Q end is put 1, brushless electric machine pwm signal is blocked, and output torque is revoked, fast
Speed reaches rotation-clogging protection.
As in figure 2 it is shown, the commutation CW/CCW signal that controller is exported by the protection unblock logic circuit of the method is through monostable
Produce after state trigger effect to unlock and trigger pulse, and with power-on reset signal and non-post output unlocking signal to rest-set flip-flop S
End, the specific works principle of release circuit and process be:
A, when commutation signal CW/CCW keeps constant, although current of electric becomes 0, but owing to the state of rest-set flip-flop is protected
Holding characteristic, brushless electric machine pwm signal still keeps blocking；
B and when commutation signal CW/CCW occur convertible time, monostable flipflop produce about 20ms width reset arteries and veins
Punching, and rest-set flip-flop is set to 0 so that protection unlocks, and motor is in normal operating conditions.
So, according to above protection and unblock principle and process, this circuit is capable of motor forward direction and runs generation stall
Time, can quickly be protected and be kept blocking (now controller is invalid as sent operating instruction in the same direction), and be controlled
Can unlocking motor in time when device sends inverted running instruction so that it is recover properly functioning.
Preferably, the threshold comparator in the quick Lock protective circuit of described brshless DC motor, monostable flipflop,
Rest-set flip-flop, NAND gate and protection blocking circuit all use TTL circuit realiration, and level reversal rate is fast, and the protection startup time is little
In 100 μ s.
Preferably, described brshless DC motor quick rotation-clogging protection method and circuit, the startup of its locked rotor current protection
Threshold value is adjusted by escaping motor maximum starting current.
The present invention at least includes following beneficial effect:
(1) stall situation brshless DC motor occurred in any situation, all energy quickly starting protection, cancels output and turns
Square, locking motor, start the time within 100 μ s, thus the safety in operation of the machinerys such as automatic door and window can be improved.
(2) pure simulation and Digital Logical Circuits is used to realize the sampling of locked rotor current, signal amplification, latching logic and unblock
Logic, it is not necessary to use CPU and computer program to realize correlation function, simple in construction, with low cost.
(3) after protection act, keeping function owing to rest-set flip-flop has state, even if electric current reduces to 0, motor still keeps closing
Lock, will not repeat to occur to run stall phenomenon in the same direction, and protection is reliable, but inverted running can the most directly unlock protection, uses
Convenient.
(4) protection act starting current threshold value can be adjusted by potentiometer, conveniently carries out adjusting of action threshold value.
Part is embodied by the further advantage of the present invention, target and feature by description below, and part also will be by this
Invention research and practice and be understood by the person skilled in the art.
Accompanying drawing explanation
Fig. 1 is the mode of connection signal accessing electric machine control system of brshless DC motor of the present invention protection module
Figure.
Fig. 2 be brshless DC motor guard method of the present invention and circuit realize theory diagram.
Fig. 3 is the specific embodiments circuit theory diagrams of brshless DC motor guard method of the present invention and circuit.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to description literary composition
Word can be implemented according to this.
Should be appreciated that used herein such as " have ", " comprising " and " including " term are not precluded from one or many
Other element individual or the existence of a combination thereof or interpolation.
The present invention discloses a kind of method being applicable to the quick rotation-clogging protection of brshless DC motor and realizes circuit.The method
Using pure simulation and digital circuit composition, it is amplified by current sampling, signal, threshold value arranges and compares, rest-set flip-flop, protection are closed
The part compositions such as lock, protection unblock, wherein, protection solves latching segment again by monostable flipflop, electrification reset circuit, NAND gate etc.
Digital Logical Circuits is constituted.
This protection circuit operation principle is: by being connected on the resistance of DC brushless motor electric power loop to motor drive current
It is sampled, and amplifies and comparator through analogue signal, compare with protection threshold voltage and produce protection triggering signal, protection afterwards
Triggering signal and be connected to the S end of rest-set flip-flop, protection unlocking signal is connected to rest-set flip-flop R end.After system power-on reset, rest-set flip-flop
Being in 0 state, motor normally works；And when, after motor rotation blockage, its electric current raises rapidly, after amplifying via current sampling and signal
Signal and protection threshold value compare after export high level rest-set flip-flop is put 1, motor PWM signal is blocked, and is rapidly reached
Rotation-clogging protection；When commutation signal occurs convertible, monostable flipflop produce reset pulse, and rest-set flip-flop is set to 0, make
Must protect unblock in time, motor is in normal operating conditions.
It is illustrated in figure 3 method and the example of circuit of the quick rotation-clogging protection of a kind of brshless DC motor, is i.e. embodied as
Circuit.This example circuit is the circuit module that a brshless DC motor to controlling for automatic door and window implements quickly protection.
Described current sampling is realized by 1 Ω resistance R6 in Fig. 3 (b), and it is connected on power supply input network V+ and output is arrived
Between the electric power network VM of motor, when motor runs, electric current flows through R6, and size of current is converted into voltage signal.
Described signal amplifying function is realized by the i.e. integrated current of the U4 in 3 (b) detection amplifier chip INA282, this amplification
Device will enter into after the differential voltage between 8 ends (+IN) and 1 end (-IN) amplifies 50 times and exports from 5 ends (OUT).
Described threshold value arranges and compares and is made up of the 10k Ω potentiometer R7 and voltage comparator U5A i.e. LM393 in 3 (b),
By adjusting potentiometer R7, protection act threshold voltage is input to 2 ends (N end) of LM393, and detects voltage and be input to LM393
3 ends (P end), when occurring stall to cross stream, detection voltage is higher than threshold voltage i.e. UP＞ UN, 1 end (OUT terminal) of LM393 is by low
Level becomes high level and this level S end by CURRENT_DETECT network output to rest-set flip-flop.
Described rest-set flip-flop is made up of two nor gate 74LS02 unit, i.e. U3B and U3C, integrated four nor gate chip U3
The 5 R ends being rest-set flip-flop, the S end that 9 feet are rest-set flip-flop of U3, it is defeated that 6 feet of U3 and 10 feet are connected as rest-set flip-flop
Go outThe connected output Q end as rest-set flip-flop of end, 8 feet of U3 and 4 feet.9 feet (S end) input of U3 is for time high, and Q end is set to
Height, and keep high level state；5 feet (R end) input of U3 is for time high, and Q end is set low, and keeps low level.
Described protection blocking circuit is by nor gate 74LS02 unit U3D, resistance R4 and R5, NPN type triode Q1
(9013) constituting, when rest-set flip-flop Q end output high level is to 12 foot of U3D, its outfan 13 foot is forced to be set to low level, and three
Pole pipe Q1 is not turned on, and PWM_OUT is output as high level, and motor runs and is prohibited, during the 12 foot input low level of U3D, and its 13 foot
Output by 11 feet input signal PWM_IN determine, PWM_OUT output consistent with speed regulating control signal PWM_IN waveform, motor
Properly functioning and carry out speed governing by the dutycycle of PWM_IN signal.
Described protection unlocks the monostable flipflop of logical gate by the two of integrated couple of monostable flipflop chip 74LS123
Individual unit (U2A and U2B), NAND gate unit U1A (74LS00), nor gate unit U3A (74LS02) and two
5.1k Ω resistance R1 and R2, two 10 μ F electric capacity C1 and C2 are constituted.The direction control signal CW/CCW of input is divided into two-way, and one
It is input to monostable flipflop U2's again after the phase inverter (its 1 foot and 2 feet are in parallel) that road signal is constituted through NAND gate unit U1A
1 footAs the trigger signal source of a monostable trigger unit, another road signal is directly inputted to monostable flipflop U2
9 feetAs the trigger signal source of another monostable trigger unit, R1, C1 and R2, C2 separately constitute RC charge and discharge electrical network
Network is also respectively connected between the 6 of two monostable flipflops, 7,14,15 feet and power supply VCC, is two monostable trigger unit
Time delay is provided, determines that the width of output monostable trigger pulse is about 20ms, by two monostable trigger unit from respective Q end
The pulse that (13 feet of U2 and 5 feet) export exports the low of an about 20ms after nor gate unit U3A (74LS02) effect
Level pulse, produces rest-set flip-flop reset signal for follow-up circuit.The effect that this circuit can reach is: when CW/CCW signal
From high level become low level time, monostable trigger unit U2B produces high level pulse, and when CW/CCW signal is become by low level
During for high level, monostable trigger unit U2A produces high level pulse, through U3A (74LS02) or non-post, CW/CCW is believed
Number occur any upset all can U3A (74LS02) outfan produce a low level pulse.
Described electrification reset circuit is in series by 5.1k Ω resistance R3 and 10 μ F electric capacity C3, and described resistance one end is connected to electricity
Source, electric capacity one end is connected to ground, and series connection point is connected to 4 feet of described NAND gate 74LS00 (U1B), exports with above-mentioned U3A (74LS02)
The low level pulse that end produces and non-post output signal to the R end of described rest-set flip-flop.R3 and C3 forms RC discharge and recharge network, is
When system powers on, RC network series connection point produces about 20ms low level, produces about 20ms high level reset pulse after NAND gate effect,
Rest-set flip-flop is resetted；Under normal circumstances, RC network series connection point keeps high level, now NAND gate 74LS00 (U1B) phase
When in a phase inverter, the low level pulse that produced by U3A (74LS02) outfan is anti-phase for high level pulse, is applied to RS and touches
Send out device R end, can be used for electric motor protecting and unlock.
Fig. 3 (a) show one and is made up of devices such as power management chip TD1591, some resistance, electric capacity, diodes
Small-power BUCK type Switching Power Supply, for driving the brshless DC motor of input in power supply V+ decompression transformation cost circuits module
DC source VCC required for simulation and digital circuit work.
The work process being embodied as the corresponding rotation-clogging protection of circuit realiration and protection unlocking function described in employing is as follows:
A. after system electrification, NAND gate U1B produces about 20ms high level pulse, and rest-set flip-flop is reset, and its output Q end is i.e.
The 4 foot output low levels of U3B, PWM speed-regulating signal can normally export, and motor can be properly functioning.
B. and when, after motor rotation blockage, its electric current raises rapidly, R6 both end voltage raises, and after 50 amplifications of U4, voltage is high
In comparing threshold value, output signal CURRENT_DETECT of U5A is uprised by low, the 4 foot outputs of the rest-set flip-flop output i.e. U3B of Q end
High level, the 13 foot output low levels of U3D, audion Q1 is not turned on, and PWM_OUT keeps high level, and motor is prohibited, and output turns
Square is revoked, and is in protection blocking state.
C. when commutation signal CW/CCW keeps constant, although locked rotor current becomes 0, output signal CURRENT_ of U5A
DETECT is low, but due to the retention performance of rest-set flip-flop, 4 feet of its output i.e. U3B of Q end keep high level, brushless electric machine PWM
Signal keeps blocking；
D. and when commutation signal CW/CCW occur convertible time (rising edge or trailing edge), by monostable flipflop unit
U2A or U2B produces about 20ms high level pulse, U3A output low level pulse, and U1B exports high level pulse, put by rest-set flip-flop
0, the 4 foot output low levels of the output i.e. U3B of Q end, PWM speed-regulating signal can normally export, and motor can be properly functioning, and protection is solved
Lock.
Although embodiment of the present invention are disclosed as above, but it is not restricted in description and embodiment listed
Use.It can be applied to various applicable the field of the invention completely.Can be easily for those skilled in the art
Realize other amendment.Therefore, under the general concept limited without departing substantially from claim and equivalency range, the present invention does not limit
In specific details with shown here as the legend with description.
Claims (6)
1. brshless DC motor quick rotation-clogging protection method and a circuit, the method and circuit amplified by current sampling, signal,
The part compositions such as threshold value arranges and compares, rest-set flip-flop, protection blocking, protection unblock, wherein, protection solves latching segment again by monostable
The logic circuits such as state trigger, electrification reset circuit, NAND gate are constituted, and this circuit module is connected on controller and brshless DC motor
Between, brshless DC motor, when any situation generation stall, all can carry out quick rotation-clogging protection to motor, cancels output and turns
Square, locking motor, until unlocking motor when direction control signal occurs to overturn.
Brshless DC motor the most according to claim 1 quick rotation-clogging protection method and circuit, is characterized in that: this circuit leads to
Cross and be connected on the resistance of DC brushless motor electric power loop motor drive current is sampled, and amplify and ratio through analogue signal
Relatively device, compares with protection threshold voltage and produces protection triggering signal afterwards, and protection triggers signal and is connected to rest-set flip-flop S end, due to
The memory function of rest-set flip-flop, can maintain protection blocking state.
Brshless DC motor the most according to claim 1 quick rotation-clogging protection method and circuit, is characterized in that: system electrification
After reset, rest-set flip-flop Q end is in 0 state, and motor normally works；And when, after motor rotation blockage, its electric current raises rapidly, via electricity
Signal after stream sampling and amplification exports high level after comparing with protection threshold value and rest-set flip-flop Q end is put 1, brushless electric machine
Pwm signal is blocked, and output torque is revoked, and is rapidly reached rotation-clogging protection.
Brshless DC motor the most according to claim 1 quick rotation-clogging protection method and circuit, is characterized in that: when commutation letter
Number keep constant time, even if locked rotor current disappear, brshless DC motor pwm signal still keeps blocking；And work as commutation signal
When occurring convertible, monostable flipflop producing one fixed width reset pulse, reset pulse is connected to the R end of rest-set flip-flop,
And rest-set flip-flop is set to 0 so that protection unlocks, and motor is in normal operating conditions.
Brshless DC motor the most according to claim 1 quick rotation-clogging protection method and circuit, is characterized in that: in circuit
Threshold comparator, monostable flipflop, rest-set flip-flop, NAND gate and protection blocking circuit all use TTL or CMOS hardware circuit
Realizing, level reversal rate is fast, and the protection startup time is short.
Brshless DC motor the most according to claim 1 quick rotation-clogging protection method and circuit, is characterized in that: locked rotor current
The startup threshold value of protection is adjusted by escaping motor maximum starting current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877393.3A CN106169736B (en) | 2016-09-30 | 2016-09-30 | A kind of quick Lock protective circuit of brshless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877393.3A CN106169736B (en) | 2016-09-30 | 2016-09-30 | A kind of quick Lock protective circuit of brshless DC motor |
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| Publication Number | Publication Date |
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| CN106169736A true CN106169736A (en) | 2016-11-30 |
| CN106169736B CN106169736B (en) | 2019-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610877393.3A Active CN106169736B (en) | 2016-09-30 | 2016-09-30 | A kind of quick Lock protective circuit of brshless DC motor |
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Cited By (6)
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| CN107863756A (en) * | 2017-09-29 | 2018-03-30 | 西安工程大学 | The rotation-clogging protection method of high-tension switch cabinet electric chassis in-car direct current generator |
| CN108078499A (en) * | 2017-12-05 | 2018-05-29 | 北京奇虎科技有限公司 | The stall detection method of robot and brush device, electronic equipment |
| CN110416972A (en) * | 2019-08-26 | 2019-11-05 | 无锡雷利电子控制技术有限公司 | Rotation-clogging protection and stall restart circuit device |
| CN112152186A (en) * | 2020-09-17 | 2020-12-29 | 中车青岛四方机车车辆股份有限公司 | Locked-rotor protection circuit of low-power-consumption direct-current motor |
| CN114285351A (en) * | 2022-03-01 | 2022-04-05 | 杭州迈的智能科技有限公司 | Motor start locked rotor recognition circuit is hung to clothing |
| CN114362094A (en) * | 2021-12-22 | 2022-04-15 | 核工业西南物理研究院 | Overcurrent protection circuit for fast recovery high-voltage power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107863756A (en) * | 2017-09-29 | 2018-03-30 | 西安工程大学 | The rotation-clogging protection method of high-tension switch cabinet electric chassis in-car direct current generator |
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| CN108078499A (en) * | 2017-12-05 | 2018-05-29 | 北京奇虎科技有限公司 | The stall detection method of robot and brush device, electronic equipment |
| CN110416972A (en) * | 2019-08-26 | 2019-11-05 | 无锡雷利电子控制技术有限公司 | Rotation-clogging protection and stall restart circuit device |
| CN112152186A (en) * | 2020-09-17 | 2020-12-29 | 中车青岛四方机车车辆股份有限公司 | Locked-rotor protection circuit of low-power-consumption direct-current motor |
| CN114362094A (en) * | 2021-12-22 | 2022-04-15 | 核工业西南物理研究院 | Overcurrent protection circuit for fast recovery high-voltage power supply system |
| CN114285351A (en) * | 2022-03-01 | 2022-04-05 | 杭州迈的智能科技有限公司 | Motor start locked rotor recognition circuit is hung to clothing |
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| CN106169736B (en) | 2019-02-12 |
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Application publication date: 20161130 Assignee: Nanjing super step Technology Co., Ltd. Assignor: Nanjing Forestry University Contract record no.: X2019320000053 Denomination of invention: Brushless DC motor is stifled protection circuit module that changes fast Granted publication date: 20190212 License type: Common License Record date: 20190906 |
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Application publication date: 20161130 Assignee: Suzhou Mingchen Precision Machinery Co., Ltd Assignor: NANJING FORESTRY University Contract record no.: X2020320000158 Denomination of invention: A fast locked rotor protection circuit for brushless DC motor Granted publication date: 20190212 License type: Common License Record date: 20201110 |
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