CN207353830U - A kind of protection circuit for preventing BLDC motors to be driven operating power generation - Google Patents
A kind of protection circuit for preventing BLDC motors to be driven operating power generation Download PDFInfo
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- CN207353830U CN207353830U CN201721484663.0U CN201721484663U CN207353830U CN 207353830 U CN207353830 U CN 207353830U CN 201721484663 U CN201721484663 U CN 201721484663U CN 207353830 U CN207353830 U CN 207353830U
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Abstract
The utility model provides a kind of protection circuit for preventing BLDC motors to be driven operating power generation, including at least two-stage voltage reduction module；Wherein level-one decompression protection module includes switch module and the first voltage reduction module；Two level decompression protection module includes the second voltage reduction module.First voltage reduction module and the second voltage reduction module are sequentially turned on or turned off by the varying voltage signal that operating generation is driven by BLDC motors; realize two-stage decompression protection, solve the problems, such as because BLDC motors be driven operating power generation caused by power panel, built in control panel damage；Meanwhile pass through the protection of abnormal protection module and overcurrent protection module, it is ensured that protection circuit normal work.
Description
Technical field
BLDC motor protective circuits field is the utility model is related to, more particularly to one kind prevents BLDC motors to be driven operating
The protection circuit of power generation.
Background technology
The birth of brshless DC motor (Brushless Direct Current Motor, abbreviation BLDC motor), overcomes
The birth defects of brushed DC motor, instead of mechanical commutator so that brshless DC motor both had with electronic commutator
There is the features such as direct current generator good speed adjusting performance, and with ac motor structure is simple, non-commutation spark, reliable and easy
In safeguard the advantages that, it is widely used in air purifier, air-conditioning, DC electric fan etc..
BLDC motors include 5 interface ends：HI-DC ends, PGND ends ,+15V ends, VSP ends, FG ends；
PGND ends：As public power, it is desirable to which this 5 lines will be using PGND as publicly；
HI-DC ends：Exterior control panel is supplied to the major impetus of BLDC motors to supply power supply, generally in 310VDC or so,
Just refer to the extremely elevated voltage in this circuit when BLDC motors are driven operating power generation generation high pressure；
+ 15V ends：Exterior control panel is supplied to supply power supply of the BLDC motors as internal control IC；
VSP ends：Exterior control panel is supplied to a speed electric of BLDC motors；
FG ends：The rotational speed pulse signal of BLDC motors output, supply control circuit are made rotating speed detecting and are used；
When BLDC motors apply to outdoor occasion, such as air-conditioner outdoor unit etc., can be because by typhoon band when undergoing typhoon
Dynamic flabellum operates and generates electricity and produce high direct voltage, and the high direct voltage that the rotation of BLDC motors produces can be output to electricity by HI-DC ends
Control panel etc. built in source plate, BLDC, when the highest born beyond control panel built in power panel, BLDC that accumulates of high direct voltage
During voltage, the damage of power panel, control panel built in BLDC will be caused.
Utility model content
One kind, which is provided, to solve the problems, such as to mention the utility model in above-mentioned background technology prevents BLDC motors to be driven fortune
The protection circuit of electricity is forwarded, including at least two-stage voltage reduction module；Wherein：
Level-one decompression protection module includes switch module and the first voltage reduction module；
Two level decompression protection module includes the second voltage reduction module；
The switch module and the second voltage reduction module are coupled with interface module；Interface module is used for BLDC motors certainly
Raw voltage output of changing the line of production is to switch module and the second voltage reduction module；The switch module and the first voltage reduction module couple；It is described
First voltage reduction module and second voltage reduction module are used to attrition voltage；
The conduction threshold of the switch module and the second voltage reduction module is different；The different voltages exported by interface module are believed
Number control switch module and the second voltage reduction module are sequentially turned on or turned off.
Further, the switch module also with abnormal protection module couples；Second voltage reduction module and the interface
Overcurrent protection module is coupled between module.
Further, first voltage reduction module and switch module are coupled with detecting module；The detecting module and MCU
Coupling；The MCU and abnormal protection module couples；The abnormal protection module is coupled with the switch module.
Further, first voltage reduction module includes dropping resistor R36 and dropping resistor R38；The dropping resistor R36
Connect with dropping resistor R38.
Further, second voltage reduction module includes absorption diode TVS1；The absorption diode TVS1 anodes connect
Ground, absorption diode TVS1 cathodes are connected with overcurrent protection module.
Further, the overcurrent protection module includes fuse F2；Described fuse F2 one end is connected with interface module；
The fuse F2 other ends are connected with absorption diode TVS1 cathodes.
Further, the switch module includes diode D6, triode Q3, triode Q4 and field-effect tube Q6；Three poles
Pipe Q3 base stages are connected with diode D6 cathodes；Diode D6 anodes are connected with DI-DC ends；Triode Q3 emitters are grounded；Three poles
Pipe Q3 collectors are connected with triode Q4 base stages；The collector of triode Q4 is connected with field-effect tube Q6 grids；Field-effect tube Q6
Drain-Source is connected with the first voltage reduction module and detecting module；Field-effect tube Q6 substrates pass through abnormal protection module ground.
Further, the abnormal protection module includes relay REL1, diode D9 and triode Q5；Field-effect tube Q6
Substrate is connected with relay REL1 contacts one end；Relay REL1 contacts other end ground connection；Relay REL1 coils one end and three
Pole pipe Q5 collectors are connected with diode D9 anodes；The relay REL1 coils other end is connected with diode D9 cathodes；Triode
Q5 base stages are connected with MCU；Triode Q5 emitters are grounded.
Further, the detecting module includes optocoupler OP5；The optocoupler OP5 anodes and the first voltage reduction module and switch
Module connects；The optocoupler OP5 collectors are connected with MCU；Optocoupler OP5 cathodes and optocoupler OP5 emitters are grounded.
The protection circuit provided by the utility model for preventing BLDC motors to be driven operating power generation, passes through BLDC motor quilts
Drive the varying voltage signal that operating produces that the first voltage reduction module and the second voltage reduction module are sequentially turned on or turned off, pass through first
Voltage reduction module and the second voltage reduction module carry out consumption decompression to voltage, realize two-stage decompression protection mechanism, solve because of BLDC
The problem of motor is driven power panel caused by operating power generation, control panel built in BLDC damages；Meanwhile pass through abnormal protection mould
Block and overcurrent protection module respectively protect dual-electrode protecting circuit, prevent circuit because BLDC motors from being produced because being driven operating
Voltage it is excessive cause protect circuit damage the problem of, it is ensured that protection circuit normal work.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are
Some embodiments of the utility model, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the protection circuit diagram provided by the utility model for preventing BLDC motors to be driven operating power generation；
Fig. 2 is depressured protection module circuit diagram for level-one；
Fig. 3 is depressured protection module circuit diagram for two level；
Fig. 4 is interface module schematic diagram.
Reference numeral：
10 interface module, 20 level-one is depressured 21 divider filter module of protection module
22 23 first voltage reduction module of switch module, 24 detecting module
26 abnormal protection module, 30 two level is depressured 31 overcurrent protection module of protection module
32 second voltage reduction modules
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, those of ordinary skill in the art's all other embodiments obtained without creative efforts, belongs to
The scope of the utility model protection.
, it is necessary to explanation in the description of the utility model, term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of description the utility model and simplifies description, rather than instruction
Or imply that signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore be not understood that
For the limitation to the utility model.In addition, term " first ", " second " and similar word are only used for description purpose, without
It is understood that to indicate or implying relative importance." connection " either similar word such as " connected " and non-limiting with physics or machinery
Connection, but electrical connection, light connects etc. can be included, either directly or indirectly.
The utility model embodiment provides a kind of protection circuit for preventing BLDC motors to be driven operating power generation, includes at least
Two-stage voltage reduction module；Wherein：
Level-one decompression protection module 20 includes 22 and first voltage reduction module 23 of switch module；
Two level decompression protection module 30 includes the second voltage reduction module 32；
22 and second voltage reduction module 32 of switch module is coupled with interface module 10；Interface module 10 is used for will
The voltage output that the rotation of BLDC motors produces is to 22 and second voltage reduction module 32 of switch module；The switch module 22 and first drops
Die block 23 couples；First voltage reduction module 23 and second voltage reduction module 32 are used to attrition voltage；
The switch module 22 is different with the conduction threshold of the second voltage reduction module 32；Exported not by interface module 10
22 and second voltage reduction module 32 of switch module is controlled to sequentially turn on or turn off with voltage signal.
When it is implemented, as shown in Figure 1, a kind of protection circuit for preventing BLDC motors to be driven operating power generation, is at least wrapped
Include but be not limited to level-one and be depressured protection module 20 and two level decompression protection module 30；The voltage output end of interface module 10 is BLDC
The HI-DC ends (as shown in Figure 4) of motor interface；Wherein：
Level-one decompression protection module 20 includes 22 and first voltage reduction module 23 of switch module；
Two level decompression protection module 30 includes the second voltage reduction module 32；
22 and second voltage reduction module 32 of switch module is coupled with interface module 10；Interface module 10 is used for BLDC motors
The voltage output that rotation produces is to 22 and second voltage reduction module 32 of switch module；22 and first voltage reduction module of switch module, 23 coupling
Connect；First voltage reduction module 23 and the second voltage reduction module 32 are used to attrition voltage；
Switch module 22 is different with the conduction threshold of the second voltage reduction module 32；The different voltages exported by interface module 10
22 and second voltage reduction module 32 of Signal-controlled switch module is sequentially turned on or turned off.
When the voltage of 10 voltage output end of interface module is more than threshold value U1, the input voltage signal that switch module 22 receives
More than setting value, switch module 22 turns on, then the first voltage reduction module 23 turns on, and is converted electrical energy into by the first voltage reduction module 23
Other energy (such as thermal energy, mechanical energy, chemical energy), realize voltage consumption；Electric energy is turned it is preferred that level-one is depressured protection module 20
It is changed to thermal energy；
When decompression ability of the voltage that the rotation of BLDC motors produces beyond level-one decompression protection module 20, will show to connect
The voltage of 10 voltage output end of mouth mold block continues the state gradually risen, when rising to a certain extent, 10 voltage of interface module
The voltage of output terminal is more than threshold value U2, will trigger two level decompression protection module 30 again and continue consumption decompression；Two level decompression protection mould
Block 30 by the second voltage reduction module 32 convert electrical energy into other can (such as thermal energy, mechanical energy, chemical energy) come attrition voltage, this
When, level-one decompression protection module 20 and two level decompression protection module 30 work at the same time；It is preferred that two level is depressured protection module 30
Convert electrical energy into thermal energy；
It is preferred that as shown in Figure 1, it is connected with divider filter module between 10 output terminal of switch module 22 and interface module
21；Divider filter module 21 is coupled to switch module 22 after the voltage of 10 output terminal of interface module is filtered；Such as Fig. 2 institutes
Show, divider filter module 21 includes resistance R27, resistance R28, resistance R29, resistance R30, resistance R31 and capacitance C18；Resistance R27
One end is connected with 10 output terminal of interface module；The resistance R27 other ends are connected with resistance R28 one end；The resistance R28 other ends and resistance
R29 one end connects；The resistance R29 other ends are connected with resistance R30 one end and resistance R31 one end；The resistance R31 other ends and capacitance
C18 one end and switch module 22 connect；The resistance R30 other ends and the capacitance C18 other ends are grounded；Resistance R27, resistance R28, electricity
Hinder R29 and resistance R30 and form bleeder circuit, the voltage of resistance R30 (PGND) over the ground is prevented through R31 and capacitance C18 low-pass filtering
Only interference maloperation is made；The voltage of 10 output terminal of interface module forms the input voltage of switch module 22 through divider filter module 21.
What the utility model embodiment provided prevents BLDC motors to be driven the protection circuit of operating power generation, passes through BLDC electricity
Machine is driven the varying voltage signal that operating produces and the first voltage reduction module and the second voltage reduction module is sequentially turned on or turned off, and passes through
First voltage reduction module and the second voltage reduction module carry out consumption decompression to voltage, realize two-stage decompression protection mechanism, solve because
The problem of BLDC motors are driven power panel caused by operating power generation, control panel built in BLDC damages.
Preferably, the switch module 22 is also coupled with abnormal protection module 26；Second voltage reduction module 32 with it is described
Overcurrent protection module 31 is coupled between interface module 10.
When it is implemented, switch module 22 is also coupled with abnormal protection module 26；Second voltage reduction module 32 and interface module
Overcurrent protection module 31 is coupled between 10.
When decompression ability of the voltage that the rotation of BLDC motors produces beyond level-one decompression protection module 20, the first decompression mould
23 component of block can be damaged or high temperature comes off, meanwhile, the short-circuit abnormal phenomenon of switch module 22 also easily occurs；Switch module
22 short circuits are abnormal will to cause 10 voltage input end of interface module to be also at discharge condition in normal DC voltage range；This
Utility model occurs by coupling abnormal protection module 26 on switch module 22 in the first voltage reduction module 23 or switch module 22
Switch module 22 is disconnected when abnormal, so that 20 circuit of whole level-one decompression protection module be disconnected, realizes abnormal protection,
The damage caused by 10 voltage output end of interface module is avoided at the same time, effectively prevents 10 voltage output end of interface module normal straight
Energy loss and circuit abnormality caused by lasting paradoxical discharge in the range of galvanic electricity pressure；
When decompression ability of the voltage that the rotation of BLDC motors produces beyond two level decompression protection module 30, two level decompression is protected
The conducting electric current of shield module 30 will exceed running current, be easy to cause the damage of the second voltage reduction module 32；The utility model
By coupling overcurrent protection module 31 on the second voltage reduction module 32, when the conducting electric current of two level decompression protection module 30 will exceed
During running current, triggering overcurrent protection module 31 disconnects, so that 30 circuit of two level decompression protection module be disconnected, realizes
Stream protection
What the utility model embodiment provided prevents BLDC motors to be driven the protection circuit of operating power generation, passes through abnormal guarantor
Shield module and overcurrent protection module respectively protect dual-electrode protecting circuit, prevent circuit because BLDC motors because being driven fortune
The problem of raw voltage of changing the line of production is excessive to be caused to protect circuit damage, it is ensured that protection circuit normal work.
Preferably, first voltage reduction module 23 and switch module 22 are coupled with detecting module 24；The detecting module
24 couple with MCU；The MCU is coupled with abnormal protection module 26；The abnormal protection module 26 and 22 coupling of switch module
Connect.
When it is implemented, when fierce typhoon causes BLDC motors to be driven the voltage of operating generation far beyond the first drop
The short circuit of switch module 22, or the component damage on the first voltage reduction module 23 are easy to cause during the consumption ability on 23 tunnel of die block
Disconnection or high temperature desoldering, the exception of 22 or first voltage reduction module 23 of switch module, ends detecting module 24, MCU (notes：It is built-in
Pull-up resistor) read lasting high level；
And the short circuit of switch module 22 is abnormal, it will cause 10 voltage output end of interface module in normal DC voltage range
Inside it is also at discharge condition, it is necessary to it is protected by abnormal protection module 26
First voltage reduction module 23 and switch module 22 are coupled with detecting module 24；Detecting module 24 and MCU is coupled；MCU
Coupled with abnormal protection module 26；Abnormal protection module 26 is coupled with switch module 22；When the first voltage reduction module 23 or switching molding
When block 22 is abnormal, detecting module 24 is used to the abnormal signal of the first voltage reduction module 23 and switch module 22 feeding back to MCU；MCU
According to the signal output level signal received from detecting module 24 to abnormal protection module 26, abnormal protection module 26 is led
Logical, the abnormal protection module 26 of conducting disconnects switch module 22, so that level-one decompression protection module 20 be disconnected, realizes abnormal
Protection；
MCU be with to input, export signal carry out processing reaction micro-control circuit, it is defeated equipped with signal input part and signal
Outlet；The signal input part of MCU receives the detection signal of detecting module 24；The signal output part outputs level signals of MCU are to different
Normal protection module 26；When detection signal is permanent High level, MCU receives and handles, and MCU output terminals export high level signal to different
Normal protection module 26.
Preferably, first voltage reduction module 23 includes dropping resistor R36 and dropping resistor R38；The dropping resistor R36
Connect with dropping resistor R38.
When it is implemented, the first voltage reduction module 23 includes dropping resistor R36 and dropping resistor R38；It is preferred that further include two
Pole pipe D8；Dropping resistor R38 one end is connected with diode D8 anodes, switch module 22 and detecting module 24；Dropping resistor R38 is another
One end is connected with dropping resistor R36 one end；The dropping resistor R36 other ends are connected with diode D8 cathodes；When switch module 22 is led
When logical, absorb that to consume high-power dropping resistor R36 and dropping resistor R38 the voltage conversion of absorption be thermal energy come real by high pressure
Existing buck functionality；Specifically, the model FQP6N90C of field-effect tube Q6, field-effect tube Q6 are equipped with heat sink, for field-effect
The cooling of pipe Q6；The sustainable size of current and heat-sinking capability of dropping resistor R36, dropping resistor R38 and field-effect tube Q6 and the
Absorption decompression ability positive correlation of one voltage reduction module 23 to voltage.
Preferably, second voltage reduction module 32 includes absorption diode TVS1；The absorption diode TVS1 anodes connect
Ground, absorption diode TVS1 cathodes are connected with overcurrent protection module 31.
When it is implemented, as shown in figure 3, the second voltage reduction module 32 includes absorption diode TVS1；Absorption diode TVS1
Plus earth, absorption diode TVS1 cathodes are connected with overcurrent protection module 31；The utility model is led using minimum 418VDC's
The transient absorption diode TVS1 for the pressure that is powered is as the second voltage reduction module 32；When the voltage that interface module 10 exports is more than threshold value U2
When, absorption diode TVS1 conductings, carry out voltage by absorption diode TVS1 absorption and are converted to thermal energy to realize decompression work(
Can, achieve the purpose that double absorption is depressured；Specifically, model P15KE440A (the minimum 418VDC of absorption diode TVS1
Operation voltage).
Preferably, the overcurrent protection module 31 includes fuse F2；Described fuse F2 one end connects with interface module 10
Connect；The fuse F2 other ends are connected with absorption diode TVS1 cathodes.
When it is implemented, overcurrent protection module 31 includes fuse F2；Fuse F2 one end and the DI-DC of interface module 10
End connection；The fuse F2 other ends are connected with absorption diode TVS1 cathodes；When lasting and fierce wind drives the production of BLDC motors
When raw voltage has exceeded the consumption ability of two level decompression protection module 30, the big electricity of absorption diode TVS1 continuous high temperatures will be caused
Work is flowed, it is short-circuit abnormal to avoid overcurrent from causing, realize that overcurrent disconnects protection by inline fuse F2；Specifically, insure
The model 5A/250VAC of silk F2.
Preferably, the switch module 22 includes diode D6, triode Q3, triode Q4 and field-effect tube Q6；Three poles
Pipe Q3 base stages are connected with diode D6 cathodes；Diode D6 anodes are connected with DI-DC ends；Triode Q3 emitters are grounded；Three poles
Pipe Q3 collectors are connected with triode Q4 base stages；The collector of triode Q4 is connected with field-effect tube Q6 grids；Field-effect tube Q6
Drain-Source is connected with the first voltage reduction module 23 and detecting module 24；Field-effect tube Q6 substrates are connect by abnormal protection module 26
Ground.
When it is implemented, switch module 22 includes diode D6, NPN type triode Q3, PNP type triode Q4 and field-effect
Pipe Q6；It is preferred that further include diode D7, resistance R25, resistance R35, resistance R37, resistance R39；Diode D6 anodes and electricity
Resistance R31 is connected with capacitance C18；Triode Q3 base stages are connected with diode D6 cathodes；Triode Q3 emitters are grounded；Triode Q3
Collector is connected with resistance R25 one end and resistance R35 one end；The resistance R25 other ends are connected with resistance R39 one end；It is described
The resistance R39 other ends are connected with triode Q4 emitters；Triode Q4 base stages are connected with the resistance R35 other ends；Triode Q4 collection
Electrode is connected to diode D7 anodes；Diode D7 cathodes are connected with resistance R37 one end with field-effect tube Q6 grids；Field-effect
The Drain-Source of pipe Q6 is connected with the first voltage reduction module 23 and detecting module 24；Field-effect tube Q6 substrates and abnormal protection module
26 connections；It is preferred that diode, the leakage of field-effect tube Q6 are equipped between the drain electrode of field-effect tube Q6 and the source electrode of field-effect tube Q6
Pole connects the diode cathode, and the source electrode of field-effect tube Q6 connects the diode anode；It is preferred that triode Q3 is S8050 types
NPN triode, triode Q4 are S8550 type PNP triodes；
Have in the utility model embodiment and if only if the DirectCurrent Voltage Ratio power supply upper voltage limit at interface module 10HI-DC ends is defeated
Q3 is just turned on when fashionable correspondence DC voltage is taller；
When the output voltage of interface module 10 is more than threshold value U1, diode D6 is turned on into (forward conduction, reversely cut-off),
Drive triode Q3 conductings；When triode Q3 is turned on, triode Q4 is also switched on, and CE knot of the voltage (for+15V) through triode Q4 drives
Dynamic field-effect tube Q6 conductings；Drain-Source connection abnormity protection circuit of first voltage reduction module 23 through field-effect tube Q6 is finally led
Lead to (PGND), realize the buck functionality of the first voltage reduction module 23；Diode D7 makees due to its forward conduction, reverse blocking
With big voltge surge arrives triode Q4 when preventing field-effect tube Q6 short-circuit, causes triode Q4 reversely pressure-resistant deficiency and damage
Problem.
Preferably, the abnormal protection module 26 includes relay REL1, diode D9 and triode Q5；Field-effect tube Q6
Substrate is connected with relay REL1 contacts one end；Relay REL1 contacts other end ground connection；Relay REL1 coils one end and three
Pole pipe Q5 collectors are connected with diode D9 anodes；The relay REL1 coils other end is connected with diode D9 cathodes；Triode
Q5 base stages are connected with MCU；Triode Q5 emitters are grounded.
When it is implemented, abnormal protection module 26 includes relay REL1 and NPN type triode Q5；It is preferred that further include
Diode D9, resistance R1 and resistance R2；The substrate of field-effect tube Q6 is connected with relay REL1 contacts one end, relay REL1
Contact other end ground connection；Relay REL1 coils one end connects diode D9 cathodes；The relay REL1 coils other end and resistance
R1 one end connects；Diode D9 anodes and the resistance R1 other ends are connected with triode Q5 collectors；Triode Q5 emitters connect
Ground；Triode Q5 base stages are connected with MCU signal output parts；It is preferred that triode Q5 is S8050 type NPN triodes；Relay
REL1 is 833H-1B-C closed types；The contact normal condition of relay REL1 is normally closed, and the substrate terminal of field-effect tube Q6 is turned on
It is connected to ground terminal；When the first voltage reduction module 23 and switch module 22 occur abnormal, MCU output high level signals Relay-
Driver gives triode Q5, turns on triode Q5, and relay REL1 is attracted, and normally-closed contact disconnects, so as to cut off because of field-effect
Pipe Q6 short circuits cause the circuit of paradoxical discharge, energy loss and circuit abnormality caused by can effectively preventing lasting paradoxical discharge.
Preferably, the detecting module 24 includes optocoupler OP5；The optocoupler OP5 anodes and the first voltage reduction module 23 and open
Module 22 is closed to connect；The optocoupler OP5 collectors are connected with MCU；Optocoupler OP5 cathodes and optocoupler OP5 emitters are grounded.
When it is implemented, detecting module 24 includes optocoupler OP5, it is preferred that further including resistance R32, resistance R33, resistance R34
With voltage-stabiliser tube DZ4；Resistance R32 one end is connected with 22 and first voltage reduction module 23 of switch module；The resistance R32 other ends and resistance
R33 one end connects；Resistance R34 is connected between the resistance R33 other ends and voltage-stabiliser tube DZ4 cathodes；Voltage-stabiliser tube DZ4 anodes and optocoupler
OP5 anodes connect；Optocoupler OP5 cathodes are grounded with optocoupler OP5 emitters；Optocoupler OP5 collectors are by detection signal TET-
Short is output to MCU；
(including the during exchange input upper voltage limit) field when 10 output terminal of interface module is in normal DC voltage range
Effect pipe Q6 ends, at this time dropping resistor R36, dropping resistor R38, resistance R32, resistance R33, resistance R34, voltage-stabiliser tube DZ4 groups
Into current limliting reduction voltage circuit, the OP5 conductings of driving optocoupler, the MCU of FET-Short signal voltage input control plates is lasting low electricity
It is flat；It is preferred that the model EL817B of optocoupler OP5；
When decompression ability of the voltage that the rotation of BLDC motors produces beyond level-one decompression protection module 20, the is be easy to cause
One voltage reduction module, 23 component damage or high temperature come off, or field-effect tube Q6 be shorted to (PGND), make field-effect tube Q6 damage
It is bad；First voltage reduction module, 23 component damage or high temperature come off and field-effect tube Q6 damages end optocoupler OP5, and MCU is received
To permanent High level, and 10 output terminal of interface module can be caused to be also at discharge condition in normal voltage range；For field
Effect pipe Q6 short circuit abnormalities, this abnormality, MCU outputs Relay- are identified by FET-Short control sources MCU
Driver high level, triode Q5 conductings, relay REL1 are attracted, and normal contact is changed into normally opened at the moment；Disconnect level-one decompression
The defencive function of protection module 20；It can effectively prevent lasting paradoxical discharge from causing circuit abnormality and in normal voltage range
Energy loss and waste caused by 10 output terminal of interface module discharges；Switch module 22 and first is depressured by detecting module 24
The unusual condition of module 23 effectively detect and feed back, and abnormal protection module 26 can be prevented in switch module 22 and first
Voltage reduction module 23, which works normally, turns off switch module 22, it is ensured that protects the normal work of circuit.
Although herein more has used such as MCU, level-one decompression protection module, two level decompression protection module, has switched
Module, the first voltage reduction module, detecting module, abnormal protection module, the second voltage reduction module, overcurrent protection module, interface module, electricity
The terms such as resistance, diode, triode, optocoupler, relay, capacitance, fuse and field-effect tube, but be not precluded from using other arts
The possibility of language.The use of these terms is merely for the convenience of describing and explaining the nature of the invention；They are solved
It is all contrary to the spirit of the present invention to be interpreted into any one of the additional limitations.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, those of ordinary skill in the art should
Understand：It can still modify the technical solution described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical solution of type.
Claims (9)
- A kind of 1. protection circuit for preventing BLDC motors to be driven operating power generation, it is characterised in that：Mould is depressured including at least two-stage Block；Wherein：Level-one decompression protection module includes switch module and the first voltage reduction module；Two level decompression protection module includes the second voltage reduction module；The switch module and the second voltage reduction module are coupled with interface module；Interface module is used to produce the rotation of BLDC motors Voltage output to switch module and the second voltage reduction module；The switch module and the first voltage reduction module couple；First drop Die block and second voltage reduction module are used to attrition voltage；The conduction threshold of the switch module and the second voltage reduction module is different；The varying voltage signal control exported by interface module Make the switch module and the second voltage reduction module is sequentially turned on or turned off.
- 2. the protection circuit according to claim 1 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described Switch module also with abnormal protection module couples；Overcurrent protection is coupled between second voltage reduction module and the interface module Module.
- 3. the protection circuit according to claim 2 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described First voltage reduction module and switch module are coupled with detecting module；The detecting module is coupled with MCU；The MCU is protected with abnormal Protect module couples；The abnormal protection module is coupled with the switch module.
- 4. the protection circuit according to claim 1 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described First voltage reduction module includes dropping resistor R36 and dropping resistor R38；Dropping resistor R36 and dropping resistor the R38 series connection.
- 5. the protection circuit according to claim 2 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described Second voltage reduction module includes absorption diode TVS1；The absorption diode TVS1 plus earths, absorption diode TVS1 cathodes It is connected with overcurrent protection module.
- 6. the protection circuit according to claim 5 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described Overcurrent protection module includes fuse F2；Described fuse F2 one end is connected with interface module；The fuse F2 other ends with Absorption diode TVS1 cathodes connect.
- 7. the protection circuit according to claim 3 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described Switch module includes diode D6, triode Q3, triode Q4 and field-effect tube Q6；Triode Q3 base stages and diode D6 cathodes Connection；Diode D6 anodes are connected with DI-DC ends；Triode Q3 emitters are grounded；Triode Q3 collectors and triode Q4 bases Pole connects；The collector of triode Q4 is connected with field-effect tube Q6 grids；Field-effect tube Q6 Drain-Sources and the first voltage reduction module Connected with detecting module；Field-effect tube Q6 substrates pass through abnormal protection module ground.
- 8. the protection circuit according to claim 7 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described Abnormal protection module includes relay REL1, diode D9 and triode Q5；Field-effect tube Q6 substrates and relay REL1 contacts One end connects；Relay REL1 contacts other end ground connection；Relay REL1 coils one end and triode Q5 collectors and diode D9 anodes connect；The relay REL1 coils other end is connected with diode D9 cathodes；Triode Q5 base stages are connected with MCU；Three poles Pipe Q5 emitters are grounded.
- 9. the protection circuit according to claim 3 for preventing BLDC motors to be driven operating power generation, it is characterised in that：It is described Detecting module includes optocoupler OP5；The optocoupler OP5 anodes are connected with the first voltage reduction module and switch module；The optocoupler OP5 collection Electrode is connected with MCU；Optocoupler OP5 cathodes and optocoupler OP5 emitters are grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721484663.0U CN207353830U (en) | 2017-11-09 | 2017-11-09 | A kind of protection circuit for preventing BLDC motors to be driven operating power generation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721484663.0U CN207353830U (en) | 2017-11-09 | 2017-11-09 | A kind of protection circuit for preventing BLDC motors to be driven operating power generation |
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| CN207353830U true CN207353830U (en) | 2018-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732873A (en) * | 2017-11-09 | 2018-02-23 | 厦门芯阳科技股份有限公司 | It is a kind of to prevent BLDC motors to be driven protection circuit and method that operating generates electricity |
-
2017
- 2017-11-09 CN CN201721484663.0U patent/CN207353830U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732873A (en) * | 2017-11-09 | 2018-02-23 | 厦门芯阳科技股份有限公司 | It is a kind of to prevent BLDC motors to be driven protection circuit and method that operating generates electricity |
| CN107732873B (en) * | 2017-11-09 | 2024-03-22 | 厦门芯阳科技股份有限公司 | Protection circuit and method for preventing BLDC motor from being driven to run to generate power |
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