CN206340961U - A kind of quick Lock protective circuit module of brshless DC motor - Google Patents
A kind of quick Lock protective circuit module of brshless DC motor Download PDFInfo
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- CN206340961U CN206340961U CN201621103481.XU CN201621103481U CN206340961U CN 206340961 U CN206340961 U CN 206340961U CN 201621103481 U CN201621103481 U CN 201621103481U CN 206340961 U CN206340961 U CN 206340961U
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Abstract
The utility model discloses a kind of quick Lock protective circuit module of brshless DC motor.The circuit module by current sampling, signal amplification, threshold value set and compare, rest-set flip-flop, protection blocking, protection unblock six parts constitute, wherein, protection unblock part again is made up of monostable flipflop, electrification reset circuit, NAND gate logic circuit.After system power-on reset, rest-set flip-flop is in 0 state, motor normal work；And after motor rotation blockage, its electric current is raised rapidly, rest-set flip-flop is put 1 by output high level after being compared via the signal after current sampling and amplification and rotection thresholds, and motor PWM signal is blocked, and is rapidly reached rotation-clogging protection；When commutation signal occurs convertible, reset pulse is produced by monostable flipflop, and rest-set flip-flop is set to 0 so that protection unblock, motor is in normal operating conditions.The utility model circuit is simple, protection is quick, and the protection startup time is less than 100 μ s, can greatly improve motor operation security.
Description
Technical field
The utility model is related to a kind of motor rotation blockage protection circuit module, more particularly to a kind of brshless DC motor is quickly blocked up
Rotation protection circuit module.
Background technology
Brshless DC motor refers to brushless and commutator (or collector ring) and the motor driven using dc source, typically
By motor body and it is internally integrated driver and constitutes, is a kind of typical electromechanical integrated product, it has Traditional DC electricity
The advantage of machine, while eliminating carbon brush, slip ring structure again, does not produce spark, reliable operation, long lifespan is widely used in vapour
The fields such as car, instrument, Industry Control and Aero-Space, greater advantage has also been given play in automatic door and window control.
But, brshless DC motor be applied to automatic door and window and relevant control field when, when mechanical device move to it is spacing
Or in operation run into barrier and during stall, such as not in time, promptly locking motor and cancel output torque, then not only result in
The damage of motor and mechanical device, and personal injury may be caused to user, such as body is extruded, crushed.General
Mechanical position limitation protection device employs mechanical proximity switch, but proximity switch limited lifetime, and toggle speed is slow, and can not
Protect the stall in mechanical device operation way；And tested through the utility model designer, general electronic protection (including
The current foldback circuit of motor internal integrated drive) it is difficult to the quick stifled of automatic door and window control brshless DC motor
Rotation protection, it is impossible to meet security, reliability requirement.
The brshless DC motor that general band is internally integrated driver is controlled by 5 leads, is that power line V+ is (red respectively
Color), ground wire GND (black), direction controlling line CW/CCW (yellow, high level is rotated forward, low level reversion), control speed governing line PWM
(high level is forbidden, low level is enabled), tachometer pulse signal wire PUSLE (green).Some existing brushed DC motor electronics
Protection device employs excessively stream trigger protection, deenergization, the pattern for the unblock protection that is reversely powered, and from brshless DC motor
Visible in the composition and control mode of control lead, brshless DC motor power line V+ and ground wire GND can not reversely be powered, so
The pattern can not be applied to brshless DC motor protection, and the pattern that the utility model is considered as is excessively stream trigger protection, side
The protected mode of unblock protection is overturn to control line CW/CCW.
Utility model content
The technical problem that the utility model is solved is to provide a kind of quick Lock protective circuit module of brshless DC motor, such as
Shown in Fig. 1, by between the circuit module access controller and brshless DC motor, brshless DC motor occurs stifled in any situation
When turning, motor can quickly be protected with the startup time less than 100 μ s, cancel output torque, locking motor, until side
Unlocking motor when being overturn to control signal, so as to improve the safety in operation of the mechanical devices such as automatic door and window.
In order to solve the technical problem, the circuit module is by simulation and the detection of digital circuit locked rotor current, protection
Action, protection unlocking function, as shown in Fig. 2 specifically amplifying comprising current sampling, signal, threshold value sets and compared, RS triggerings
Device, protection blocking, protection unblock six parts, wherein, protection unblock part again by monostable flipflop, electrification reset circuit, with
NOT gate logic circuit is constituted.System connection and signal flow to relation and are：The circuit module is connected on controller and brshless DC motor
Between, current sampling element is connected in brushless direct-current circuit direct current power supply loop, current sampling signal access signal amplifier, is put
Big device output voltage access comparator is simultaneously compared with rotection thresholds voltage, comparator output signal access rest-set flip-flop S ends,
Rest-set flip-flop Q ends output signal access protection blocking circuit, electric motor protecting locking is carried out by protection blocking circuit；And brushless direct-current
Commutation control signal CW/CCW access protection release circuits, the unlock trigger signal that protection release circuit is produced is connected to rest-set flip-flop
R ends, control rest-set flip-flop Q ends overturn, de-preservation blocking.
As shown in Fig. 2 the circuit module is by being connected on the resistance of DC brushless motor electric power loop to motor drive current
It is sampled, and by analog signal amplification and comparator, produces protection trigger signal, protection more afterwards with rotection thresholds voltage ratio
Trigger signal is connected to rest-set flip-flop S ends, due to the memory function of rest-set flip-flop, can maintain protection blocking state, separately there is protection
Unlocking signal is connected to rest-set flip-flop R ends.The concrete operating principle and process of protection circuit module be：
After a, system power-on reset, rest-set flip-flop Q ends are in 0 state, motor normal work；
B and after motor rotation blockage, its electric current is raised rapidly, via the signal and rotection thresholds after current sampling and amplification
High level is exported after being compared rest-set flip-flop Q ends are put 1, brushless electric machine pwm signal is blocked, and output torque is revoked, fast
Speed reaches rotation-clogging protection, and due to the memory function of rest-set flip-flop, can maintain protection blocking state.
As shown in Fig. 2 the commutation CW/CCW signals that the protection unblock logic circuit of this method exports controller are through monostable
Unlock trigger pulse is produced after the effect of state trigger, and unlocking signal is exported to rest-set flip-flop S with power-on reset signal and non-post
End, the concrete operating principle and process of release circuit are：
A, when commutation signal CW/CCW keep it is constant when, even if motor rotation blockage current vanishes (being changed into 0), but due to RS triggering
The state retention performance of device, brshless DC motor pwm signal still keeps blocking；
B and when commutation signal CW/CCW occurs convertible, one fixed width (about 20ms) is produced by monostable flipflop multiple
Digit pulse, reset pulse is connected to the R ends of rest-set flip-flop, and rest-set flip-flop is set to 0 so that protection unblock, and motor is in normal
Working condition.
It is visible according to above protection blocking and unblock principle and process, using the quick rotation-clogging protection mould of the brshless DC motor
Block, brshless DC motor can carry out quick rotation-clogging protection to motor, cancel output torque when stall occurs for any situation,
Locking motor, until unlocking motor when direction control signal is overturn, i.e., can be fast when occurring stall to operation before motor
Speed is protected and keeps blocking (now controller is invalid as sent operating instruction in the same direction), and controller is sent reversely
During operating instruction can unlocking motor in time, it is recovered normal operation.
Preferably, in the quick Lock protective circuit module of the brshless DC motor threshold comparator, monostable are touched
Send out device, rest-set flip-flop, NAND gate and protection blocking circuit and realize that level reversal rate is fast using TTL or CMOS hardware circuits,
Protect the startup time short (being less than 100 μ s).
Preferably, the quick rotation-clogging protection method of the brshless DC motor and circuit, the startup of its locked rotor current protection
Threshold value is adjusted by the maximum starting current of motor is escaped.
The utility model at least includes following beneficial effect：
(1) the quick starting protection of the stall situation that brshless DC motor occurs in any situation, energy, revocation output turns
Square, locking motor, the time of startup can be within 100 μ s, so as to improve the safety in operation of the mechanical devices such as automatic door and window.
(2) sampling of locked rotor current, signal amplification, latching logic and unblock are realized using pure simulation and Digital Logical Circuits
Logic, it is simple in construction without realizing correlation function using CPU and computer program, it is with low cost.
(3) after protection act, because there is rest-set flip-flop state to keep function, even if electric current is reduced to 0, motor still keeps closing
Lock, will not repeat occur operation stall phenomenon in the same direction, protection is reliable, but inverted running can directly unlock protection in time, use
It is convenient.
(4) protection act starting current threshold value can be adjusted by potentiometer, facilitate progress to act adjusting for threshold value.
Further advantage of the present utility model, target and feature embody part by following explanation, and part will also pass through
Research of the present utility model and practice are understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the mode of connection of the access electric machine control system of brshless DC motor protection module described in the utility model
Schematic diagram.
Fig. 2 is the realization principle block diagram of brshless DC motor protection circuit module described in the utility model.
(a) is binding post of the present utility model and system power supply shift theory figure in Fig. 3, and (b) gathers for locked rotor current
And threshold value comparison circuit schematic diagram, (c) is the circuit theory diagrams that the utility model locking and unblock logic are implemented.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to explanation
Book word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein are not precluded from one or many
The presence or addition of individual other elements or its combination.
The utility model discloses a kind of suitable for the quick Lock protective circuit module of brshless DC motor.The circuit module is adopted
Constituted with pure simulation and digital circuit, it is set by current sampling, signal amplification, threshold value and compared, rest-set flip-flop, protection are closed
Lock, protection solution lock section are grouped into, wherein, protection unblock part is again by monostable flipflop, electrification reset circuit, NAND gate numeral
Logic circuit is constituted.System connection and signal flow to relation and are：The circuit module is connected between controller and brshless DC motor,
Current sampling element is connected in brushless direct-current circuit direct current power supply loop, current sampling signal access signal amplifier, amplifier
Output voltage accesses comparator and is compared with rotection thresholds voltage, and comparator output signal access rest-set flip-flop S ends, RS is touched
Device Q ends output signal access protection blocking circuit is sent out, electric motor protecting locking is carried out by protection blocking circuit；And brushless direct-current commutates
Control signal CW/CCW access protection release circuits, the unlock trigger signal that protection release circuit is produced is connected to the R of rest-set flip-flop
End, control rest-set flip-flop Q ends are overturn, de-preservation blocking.
C, the protection circuit module operation principle are：Motor is driven by the resistance for being connected on DC brushless motor electric power loop
Streaming current is sampled, and by analog signal amplification and comparator, produces protection triggering letter more afterwards with rotection thresholds voltage ratio
Number, protection trigger signal is connected to the S ends of rest-set flip-flop, and protection unlocking signal is connected to rest-set flip-flop R ends.After system power-on reset,
Rest-set flip-flop Q ends are in 0 state, motor normal work；And after motor rotation blockage, its electric current is raised rapidly, via current sampling
And signal and the rotection thresholds after signal amplification be compared after output high level 1, brushless electric machine PWM are put into rest-set flip-flop Q ends
Signal is blocked, and output torque is revoked, and is rapidly reached rotation-clogging protection, and due to the memory function of rest-set flip-flop, can maintain to protect
Protect blocking；When commutation signal keeps constant, even if motor rotation blockage current vanishes (being changed into 0), but due to rest-set flip-flop
State retention performance, brshless DC motor pwm signal still keeps blocking；And when commutation signal CW/CCW generations are convertible
When, one fixed width (about 20ms) reset pulse is produced by monostable flipflop, reset pulse is connected to the R ends of rest-set flip-flop, and
Rest-set flip-flop is set to 0 so that protection unblock, motor is in normal operating conditions.When commutation signal occurs convertible, by monostable
State trigger produces reset pulse, and rest-set flip-flop is set to 0 so that protection unblock in time, motor is in normal operating conditions.
(c) show a kind of circuit of the quick rotation-clogging protection of brshless DC motor in (b) and Fig. 3 in (a), Fig. 3 in Fig. 3
The example of module, that is, be embodied circuit.The example circuit is one real to the brshless DC motor controlled for automatic door and window
Apply the circuit module quickly protected.
(a) show one and is made up of devices such as power management chip TD1591, some resistance, electric capacity, diodes in Fig. 3
Small-power BUCK type Switching Power Supplies, for by the brshless DC motor driving power supply V+ decompression transformation cost circuits modules of input
Dc source VCC required for middle simulation and digital circuit work.
The current sampling realizes that it is connected on power input network V+ and output by 1 Ω resistance R6 in (b) in Fig. 3
To between the electric power network VM of motor, when motor operation, electric current flows through R6, and size of current is converted into voltage signal.
The signal amplifying function is that integrated current detection amplifier chip INA282 is realized by the U4 in (b) in Fig. 3, should
Amplifier will enter into the differential voltage between 8 ends (+IN) and 1 end (- IN) and amplify after 50 times from 5 ends (OUT) output.
The threshold value sets and compared by 10k Ω potentiometers R7 and voltage comparator U5A i.e. the LM393 structures in (b) in Fig. 3
Into, protection act threshold voltage is input to LM393 2 ends (N-terminal) by adjusting potentiometer R7, and detection voltage is input to
LM393 3 ends (P ends), when occurring stall excessively stream, detection voltage is U higher than threshold voltageP＞ UN, LM393 1 end (OUT
End) high level is changed into from low level, and the level is exported to the S ends of rest-set flip-flop by CURRENT_DETECT networks.
The rest-set flip-flop is made up of two nor gate 74LS02 units in (c) in Fig. 3, i.e. U3B and U3C, integrated four
Nor gate chip U3 5 pin are the R ends of rest-set flip-flop, and U3 9 pin are the S ends of rest-set flip-flop, the U3 connected conduct of 6 pin and 10 pin
The output of rest-set flip-flopEnd, the U3 connected output Q ends as rest-set flip-flop of 8 pin and 4 pin.U3 9 pin (S ends) input is height
When, Q ends are set to height, and keep high level state；When U3 5 pin (R ends) input is high, Q ends are set low, and keep low level.
As shown in (c) in Fig. 3, the protection blocking circuit by a nor gate 74LS02 units U3D, resistance R4 and R5,
NPN type triode Q1 (9013) is constituted, and during 12 pin of rest-set flip-flop Q ends output high level to U3D, its pin of output end 13 is forced
Low level is set to, triode Q1 is not turned on, and PWM_OUT is output as high level, and motor operation is prohibited, U3D 12 pin input is low
During level, the output of its 13 pin is determined by the input signal PWM_IN of 11 pin, PWM_OUT outputs and speed regulating control signal PWM_IN
Waveform is consistent, and motor normally runs and carries out speed governing by the dutycycle of PWM_IN signals.
As shown in (c) in Fig. 3, the monostable flipflop of the protection unblock logical gate is by collecting monostable flipflop in pairs
Chip 7,4LS,123 two units (U2A and U2B), NAND gate unit U1A (74LS00), a 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/ of input
CCW is divided into two-way, and signal is input to again after the phase inverter (its 1 pin and 2 pin are in parallel) that NAND gate unit U1A is constituted all the way
Monostable flipflop U2 1 pinAs the trigger signal source of a monostable trigger unit, another road signal is directly inputted
To monostable flipflop U2 9 pinAs the trigger signal source of another monostable trigger unit, R1, C1 and R2, C2 divide
Not Zu Cheng RC charge and discharges electric network and be respectively connected to 6 to two monostable flipflops, 7,14, be two between 15 pin and power supply VCC
Individual monostable trigger unit provides delay, and the width for determining output monostable trigger pulse is about 20ms, is touched by two monostables
The pulse that bill member is exported from respective Q ends (U2 13 pin and 5 pin) is defeated after nor gate unit U3A (74LS02) effect
Go out about 20ms low level pulse, rest-set flip-flop reset signal is produced for follow-up circuit.The effect that the circuit can reach
It is really：When CW/CCW signals are changed into low level from high level, monostable trigger unit U2B produces high level pulse, and works as CW/
When CCW signals are changed into high level from low level, monostable trigger unit U2A produces high level pulse, by U3A (74LS02) or
Non-post make it that CW/CCW signals occur any upset and all can produce a low level pulse in U3A (74LS02) output end.
As shown in (c) in Fig. 3, the electrification reset circuit is in series by 5.1k Ω resistance R3 and 10 μ F electric capacity C3, institute
State the end of resistance one and be connected to power supply, the end of electric capacity one is connected to ground, series connection point is connected to 4 pin of the NAND gate 74LS00 (U1B), it is and above-mentioned
The low level pulse that U3A (74LS02) output end is produced outputs signal to the R ends of the rest-set flip-flop with non-post.R3 and C3 compositions
RC charge and discharge electric networks, during system electrification, RC network series connection point produces about 20ms low levels, and about 20ms is produced after being acted on through NAND gate
High level reset pulse, resets to rest-set flip-flop；Under normal circumstances, RC network series connection point keep high level, now with it is non-
Door 74LS00 (U1B) equivalent to one phase inverter, the anti-phase low level pulse that U3A (74LS02) output end is produced is high level
Pulse, is applied to rest-set flip-flop R ends, available for electric motor protecting unblock.
The course of work using the specific implementation corresponding rotation-clogging protection of circuit realiration and protection unlocking function is as follows：
A. after system electrification, NAND gate U1B produces about 20ms high level pulses, and rest-set flip-flop is reset, and its output Q end is
U3B 4 pin output low level, PWM speed-regulating signals can be exported normally, and motor can normally be run.
B. and after motor rotation blockage, its electric current is raised rapidly, the rise of R6 both end voltages, and voltage is high after U4 50 amplifications
In comparing threshold value, U5A output signal CURRENT_DETECT is uprised by low, and rest-set flip-flop output Q ends are U3B 4 pin output
High level, U3D 13 pin output low level, triode Q1 is not turned on, and PWM_OUT keeps high level, and motor is prohibited, and output turns
Square is revoked, and due to the memory function of rest-set flip-flop, can maintain protection blocking state.
C. when commutation signal CW/CCW keeps constant, although locked rotor current is changed into 0, U5A output signal CURRENT_
DETECT is low, but due to the retention performance of rest-set flip-flop, it exports 4 pin that Q ends are U3B and keeps high level, brushless electric machine PWM
Signal keeps blocking；
And when commutation signal CW/CCW occurs convertible (rising edge or trailing edge), by monostable flipflop unit U2A
Or U2B produces about 20ms high level pulses, U3A output low level pulses, U1B output high level pulses set to 0 rest-set flip-flop,
Output Q ends are U3B 4 pin output low level, and PWM speed-regulating signals can be exported normally, and motor can normally be run, and protection is unlocked.
Although embodiment of the present utility model is disclosed as above, it is not restricted in specification and embodiment
It is listed to use.It can be applied to various suitable fields of the present utility model completely.For those skilled in the art
Other modification is easily achieved.Therefore under the universal limited without departing substantially from claim and equivalency range, this reality
Specific details is not limited to new and shown here as the legend with description.
Claims (6)
1. a kind of quick Lock protective circuit module of brshless DC motor, it is characterised in that：The circuit module comprising current sampling,
Signal amplification, threshold value set and compare, rest-set flip-flop, protection blocking, protection unblock six parts, wherein, protection unblock part
It is made up of again monostable flipflop, electrification reset circuit, NAND gate logic circuit；
System connection and signal flow to relation and are：The circuit module is connected between controller and brshless DC motor, current sampling
Element is connected in brushless direct-current circuit direct current power supply loop, current sampling signal access signal amplifier, amplifier output voltage
Access comparator is simultaneously compared with rotection thresholds voltage, comparator output signal access rest-set flip-flop S ends, rest-set flip-flop Q ends
Output signal accesses protection blocking circuit, and electric motor protecting locking is carried out by protection blocking circuit；And brushless direct-current commutation control is believed
Number CW/CCW access protection release circuit, the unlock trigger signal that protection release circuit is produced is connected to the R ends of rest-set flip-flop, control
Rest-set flip-flop Q ends are overturn, de-preservation blocking；
Brshless DC motor can carry out quick rotation-clogging protection to motor, cancel output torque when stall occurs for any situation,
Locking motor, until unlocking motor when direction control signal is overturn.
2. the quick Lock protective circuit module of brshless DC motor according to claim 1, it is characterized in that：The circuit module
Motor drive current is sampled by the resistance for being connected on DC brushless motor electric power loop, and by analog signal amplification and
Comparator, protection trigger signal is produced with rotection thresholds voltage ratio more afterwards, and protection trigger signal is connected to rest-set flip-flop S ends, by
In the memory function of rest-set flip-flop, protection blocking state can be maintained.
3. the quick Lock protective circuit module of brshless DC motor according to claim 1, it is characterized in that：System electrification is answered
Behind position, rest-set flip-flop Q ends are in 0 state, motor normal work；And after motor rotation blockage, its electric current is raised rapidly, via electric current
1, brushless electric machine PWM are put in rest-set flip-flop Q ends by output high level after signal after sampling and amplification is compared with rotection thresholds
Signal is blocked, and output torque is revoked, and is rapidly reached rotation-clogging protection.
4. the quick Lock protective circuit module of brshless DC motor according to claim 1, it is characterized in that：Work as commutation signal
When keeping constant, even if locked rotor current disappears, brshless DC motor pwm signal still keeps blocking；And when commutation signal hair
When raw convertible, one fixed width reset pulse is produced by monostable flipflop, reset pulse is connected to the R ends of rest-set flip-flop, and
Rest-set flip-flop is set to 0 so that protection unblock, motor is in normal operating conditions.
5. the quick Lock protective circuit module of brshless DC motor according to claim 1, it is characterized in that：Threshold in circuit
It is worth comparator, monostable flipflop, rest-set flip-flop, NAND gate and protection blocking circuit real using TTL or CMOS hardware circuits
Existing, level reversal rate is fast, and the protection startup time is short.
6. the quick Lock protective circuit module of brshless DC motor according to claim 1, it is characterized in that：Locked rotor current is protected
The startup threshold value of shield is adjusted by the maximum starting current of motor is escaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621103481.XU CN206340961U (en) | 2016-09-30 | 2016-09-30 | A kind of quick Lock protective circuit module of brshless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621103481.XU CN206340961U (en) | 2016-09-30 | 2016-09-30 | A kind of quick Lock protective circuit module of brshless DC motor |
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| Publication Number | Publication Date |
|---|---|
| CN206340961U true CN206340961U (en) | 2017-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621103481.XU Withdrawn - After Issue CN206340961U (en) | 2016-09-30 | 2016-09-30 | A kind of quick Lock protective circuit module of brshless DC motor |
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| CN (1) | CN206340961U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169736A (en) * | 2016-09-30 | 2016-11-30 | 南京林业大学 | A kind of brshless DC motor quick rotation-clogging protection method and circuit |
| CN109856537A (en) * | 2018-12-28 | 2019-06-07 | 神驰机电股份有限公司 | A kind of the stall detection method and system of the BLDC control circuit of list comparator |
-
2016
- 2016-09-30 CN CN201621103481.XU patent/CN206340961U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169736A (en) * | 2016-09-30 | 2016-11-30 | 南京林业大学 | A kind of brshless DC motor quick rotation-clogging protection method and circuit |
| CN109856537A (en) * | 2018-12-28 | 2019-06-07 | 神驰机电股份有限公司 | A kind of the stall detection method and system of the BLDC control circuit of list comparator |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170718 Effective date of abandoning: 20190212 |