CN103280767B - The braking resistor protection circuit of converter and method - Google Patents
The braking resistor protection circuit of converter and method Download PDFInfo
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- CN103280767B CN103280767B CN201310136220.2A CN201310136220A CN103280767B CN 103280767 B CN103280767 B CN 103280767B CN 201310136220 A CN201310136220 A CN 201310136220A CN 103280767 B CN103280767 B CN 103280767B
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Abstract
A kind of braking resistor protection circuit of converter; for protecting braking resistor RB to burn because of overheated, including the brake module for controlling braking resistor RB, for detect described brake module conducting and the braking performance test module of off-state, for control brake module conducting and disconnect brake control module and for connecting the buffer module of brake module and power supply；The conducting of braking performance test module detection brake module and off-state, and the result of detection is fed back to brake control module, brake control module is for according to being currently sending to the control instruction of brake module and the conducting of the output control buffer module of braking performance test module feedback and disconnection, wherein, brake control module is sent to the control instruction of brake module for disconnecting, the result of braking performance test module feedback is conducting, then brake control module controls buffer module disconnection, thus disconnects the connection of described brake module and power supply.Additionally, also provide for the braking resistor guard method of a kind of converter.
Description
Technical field
The present invention relates to braking resistor resist technology, particularly relate to the braking resistor protection electricity of a kind of converter
Resistance and method.
Background technology
Generator operation when motor is in the load of band potential energy or with deceleration, if transducer drive motor, motor
Busbar voltage can be caused to raise in energy back to converter bus.Converter typically uses braking resistor
Method by electric power generation energy with the form consumption of heat energy in braking resistor.If owing to control circuit is wrong
The reasons such as mistake or brake pipe inefficacy cause brake pipe constantly on, then be equivalent to just be placed on braking resistor
Between negative busbar, positive and negative busbar is connected to three-phase input power.Therefore braking resistor has electric current stream always
Crossing, braking resistor is energized for a long time, and heating accumulation can cause braking resistor to be burnt and possible initiation fire, makes
Become the property even loss of personnel.
A kind of side protecting braking resistor is only applicable to the protection that braking resistor is overheated, lost efficacy for brake pipe and draws
The short circuit risen can not play a protective role.The protection device of another kind of braking short circuit mutually, by detecting system simultaneously
It is the most abnormal that galvanic electricity resistance both end voltage and busbar voltage judge to brake circuitry phase, and goes here and there in braking circuitry phase
Enter controllable switch, protect braking resistor when braking short circuit mutually being detected by disconnection switch.This
Method needs to increase switch on original circuit topology, adds system cost, improves system complexity.
Summary of the invention
Based on this, it is provided that the braking resistor protection circuit of a kind of simple converter.
The braking resistor protection circuit of a kind of converter, is used for protecting braking resistor RB to burn because of overheated, bag
Include the brake module for controlling braking resistor RB, for detecting the conducting of described brake module and off-state
Braking performance test module, for control described brake module conducting and disconnect brake control module and for connecting
Described brake module and the buffer module of power supply；
Described brake module is connected to after connecting with described braking resistor RB between the both positive and negative polarity of power supply, described system
Dynamic model block is also connected with described braking performance test module, and described braking performance test module is with described brake control module even
Connecing, described brake control module is also connected with described buffer module, and described buffer module is connected to described braking
Between module and power supply；
Described braking performance test module detects conducting and the off-state of described brake module, and by the result of detection
Feeding back to described brake control module, described brake control module is for according to being currently sending to described braking mould
Described in the control instruction of block and the output control of described braking performance test module feedback, buffer module leads on and off
Opening, wherein, it is disconnection, described system that described brake control module is sent to the control instruction of described brake module
The result of dynamic detection module feedback is conducting, and the most described brake control module controls described buffer module and disconnects,
Thus disconnect the connection of described brake module and power supply.
Wherein in an embodiment, described brake module includes the audion TRB as brake pipe, described
The emitter stage of audion TRB is connected with power cathode, and the colelctor electrode of described audion TRB passes through braking resistor
RB is connected with positive source, and the base stage of described audion TRB is connected with described braking performance test module.
Wherein in an embodiment, described braking performance test module includes divider resistance R2, divider resistance R3
Light emitting diode D1 and audion Q1, described dividing potential drop is included with photo-coupler U1, described photo-coupler U1
Resistance R3 one end is connected with the negative pole of light emitting diode D1, the other end and described braking resistor RB and described
The common port of brake module connects, and the positive pole of described light emitting diode D1 is connected with positive source, described three poles
The grounded emitter of pipe Q1, the colelctor electrode of described audion Q1 is connected with one end of described divider resistance R2,
The other end of described divider resistance R2 is connected with positive source, described audion Q1 and described divider resistance R2
Common port be connected with described brake module.
Wherein in an embodiment, described buffer module includes soft start resistance R1 and switch KM1, institute
Stating soft start resistance R1 one end to be connected with power supply, the other end is connected with described brake module, described switch KM1
In parallel with described soft start resistance R1.
Wherein in an embodiment, also include the rectification module for alternating current power supply being converted into DC source,
Described rectification module output DC source, the positive pole of described DC source is connected with described braking resistor RB, institute
The negative pole stating DC voltage is connected with described buffer module.
Wherein in an embodiment, also include filtration module, described filtration module one end and described braking electricity
Resistance RB connects, and the other end is connected with described brake module.
Wherein in an embodiment, described filtration module includes electrochemical capacitor C1 and electrochemical capacitor C2, institute
State electrochemical capacitor C1 and described electrochemical capacitor C2 series connection, the positive pole of described electrochemical capacitor C1 and described braking
Resistance RB connects, and the negative pole of described electrochemical capacitor C2 is connected with described brake module.
The braking resistor protection circuit of above-mentioned converter is by the conducting shape of braking performance test module detection brake module
State is the most consistent with the control instruction of brake control module, if the control instruction of brake control module is for disconnecting,
And detecting that the state of brake module is conducting, then it is assumed that brake module is in short-circuit condition, control for brake mould
Block controls buffer module and disconnects, thus disconnects the connection of brake module and power supply, it is to avoid braking resistor is because of braking
Module short circuit and be energized for a long time, heating accumulation and cause braking resistor to be burnt.
Additionally, also provide for the braking resistor guard method of a kind of simple converter.
The braking resistor guard method of a kind of converter, comprises the following steps:
The control instruction of detection brake pipe；
If current control instruction is for disconnecting, then detect the connection status of described brake pipe, wherein, brake pipe with
Described braking resistor RB is connected；If described brake pipe is in the conduction state, then disconnect the access of described brake pipe
Power supply；If described brake pipe is off, the most described converter normally works；
If described current control instruction is conducting, then detect the connection status of described brake pipe；If described braking
Managing in the conduction state, the most described converter normally works；If described brake pipe is off, then examine
Survey the incoming end of described brake pipe.
Wherein in an embodiment, the concrete steps accessing power supply of the described brake pipe of described disconnection include:
Buffering is accessed between subcircuits and power supply after described braking resistor RB and described brake pipe are connected
Circuit；
When described brake pipe is in short-circuit condition, disconnect described buffer circuit.
Wherein in an embodiment, described control instruction is for disconnecting, when detecting described brake pipe for conducting,
The short circuit of the most described brake pipe.
The braking resistor guard method of above-mentioned converter, by detecting the control instruction of brake pipe, controls current
Instruction is disconnection, and when the connection status of brake pipe is conducting, then it is assumed that brake pipe is in short-circuit condition, from
And disconnect the access power supply of brake pipe, i.e. disconnect the connection of brake pipe and power supply, it is to avoid braking resistor is because of braking
Tube short circuit and be energized for a long time, heating accumulation and cause braking resistor to be burnt.
Accompanying drawing explanation
Fig. 1 is the module map of the braking resistor protection circuit of converter；
Fig. 2 is one of schematic diagram of braking resistor protection of converter；
Fig. 3 is the two of the schematic diagram of the braking resistor protection of converter；
Fig. 4 is the schematic diagram of braking performance test module；
Fig. 5 is the flow chart of the braking resistor guard method of converter.
Detailed description of the invention
As it is shown in figure 1, be the module map of the braking resistor protection circuit of converter.
The braking resistor protection circuit of a kind of converter, is used for protecting braking resistor RB to burn because of overheated, bag
Include the brake module 101 for controlling braking resistor RB, lead on and off for detecting described brake module 101
The braking performance test module 103 of open state, for controlling the control for brake that described brake module 101 turns on and disconnects
Module 105 and for connecting the buffer module 107 of described brake module 101 and power supply.
Described brake module 101 is connected to after connecting with described braking resistor RB between the both positive and negative polarity of power supply, institute
State brake module 101 to be also connected with described braking performance test module 103, described braking performance test module 103 and institute
Stating brake control module 105 to connect, described brake control module 105 is also connected with described buffer module 107,
Described buffer module 107 is connected between described brake module 101 and power supply.
Described braking performance test module 103 detects conducting and the off-state of described brake module 101, and will inspection
The result surveyed feeds back to described brake control module 105, and described brake control module 105 is for sending out according to current
Give control instruction and the output control institute of described braking performance test module 103 feedback of described brake module 101
Stating conducting and the disconnection of buffer module 107, wherein, described brake control module 105 is sent to described braking
The control instruction of module 101 is for disconnecting, and the result of described braking performance test module 103 feedback is conducting, then institute
State brake control module 105 to control described buffer module 107 and disconnect, thus disconnect described brake module 101
Connection with power supply.
Brake module 101, for being connected with braking resistor RB, controls the connection shape of braking resistor RB and power supply
State.Specifically, when brake module 101 turns on, braking resistor RB accesses power supply, has electric current to pass through.Braking
When module 101 disconnects, braking resistor RB disconnects the connection with power supply, does not has electric current through braking resistor RB.
I.e. brake module 101 is for controlling the conducting state of braking resistor RB, it is possible to when braking resistor RB is overheated
Disconnecting the connection of braking resistor RB and power supply, protection braking resistor RB causes burn because of overheated.
Braking performance test module 103 is for detecting the conducting state of brake module 101.In actual applications, system
Dynamic model block 101 is it is possible that fault, such as, and short circuit or open circuit.Either open circuit or short circuit, system
Dynamic model block 101 all cannot normally work.Accordingly, it would be desirable to the current operating state of brake module 101 is carried out
Detection, then compares current operating state with actual control instruction, thus judges brake module 101
The most normal.
Buffer module 107 is for disconnecting the connection of brake module 101 and power supply.General, at brake module
During 101 appearance short circuit, braking resistor RB has electric current process always, thus braking resistor RB can be caused because of mistake
Heat and cause and burn, for avoid because brake module 101 short circuit and cause the overheated situation burnt of braking resistor RB,
Thus between brake module 101 and power supply series buffer module 107.Brake module 101 short circuit detected
Time, buffer module 107 then disconnects, thus disconnects the connection of braking resistor RB and power supply.
Brake control module 105 is for receiving the feedback result of braking performance test module 103, and ties according to feedback
Fruit controls being turned on or off of buffer module 107.Specifically, current system is fed back in braking performance test module 103
When the state of dynamic model block 101 is for conducting, and when the control instruction that brake control module 105 sends is to disconnect,
Brake control module 105 then controls buffer module 107 and disconnects, the most now think brake module 101 not according to
The control instruction of brake control module 105 performs disconnection, i.e. short-circuit state occurs in brake module 101.In system
When dynamic detection module 103 feeds back the state of current brake module 101 for disconnecting, and brake control module 105
When the control instruction sent is for conducting, then it is assumed that now brake module 101 is in off state, i.e. brakes mould
Block 101 does not accesses power supply, needs to detect the connection status of brake module 101.
Incorporated by reference to Fig. 2 and Fig. 3.
Brake module 101 includes the audion TRB as brake pipe, the emitter stage of described audion TRB with
Power cathode connects, and the described colelctor electrode of audion TRB is connected with one end of braking resistor RB, braking electricity
The other end of resistance RB is connected with positive source, the base stage of described audion TRB and described braking performance test module
103 connect.
Incorporated by reference to Fig. 4.Braking performance test module 103 includes divider resistance R2, divider resistance R3 and photo-coupler
U1, described photo-coupler U1 include light emitting diode D1 and audion Q1, described divider resistance R3 one end
It is connected with the negative pole of light emitting diode D1, the other end and described braking resistor RB and described brake module 101
Common port connect, the positive pole of described light emitting diode D1 is connected with positive source, described audion Q1's
Grounded emitter, the colelctor electrode of described audion Q1 is connected with one end of described divider resistance R2, described point
The other end of piezoresistance R2 is connected with positive source, the public affairs of described audion Q1 and described divider resistance R2
End is connected with described brake module 101 altogether.
Braking performance test module 103 constitutes light by BR1 point with audion TRB driving voltage anode BR_24V
Coupling circuit comes whether detection transistor TRB turns on, when audion TRB turns on, and BR1 and busbar voltage
The same current potential of negative terminal, optocoupler turns on, and light emitting diode D1 is luminous.The BR1 open circuit when audion TRB ends,
Optocoupler is not turned on, and light emitting diode D1 extinguishes.
Buffer module 107 include soft start resistance R1 and switch KM1, described soft start resistance R1 one end with
Power supply connects, and the other end is connected with described brake module 101, described switch KM1 and described soft start resistance
R1 is in parallel.
The braking resistor protection circuit of converter also includes the rectification for alternating current power supply is converted into DC source
Module 109, described rectification module 109 exports DC source, the positive pole of described DC source and described braking electricity
Resistance RB connects, and the negative pole of described DC voltage is connected with described buffer module 107.
The braking resistor protection circuit of converter also includes filtration module 111, described filtration module 111 one end with
Described braking resistor RB connects, and the other end is connected with described brake module 101.
Filtration module 111 includes electrochemical capacitor C1 and electrochemical capacitor C2, described electrochemical capacitor C1 and described electricity
Solving electric capacity C2 series connection, the positive pole of described electrochemical capacitor C1 is connected with described braking resistor RB, described electrolysis
The negative pole of electric capacity C2 is connected with described brake module 101.
Based on above-mentioned all embodiments, in converter, when motor is in motoring condition, three-phase input AC
Power supply is rectified into DC bus-bar voltage through rectifier bridge D1, through the inverter circuit 113 of TR1～TR6 composition
The three-phase alternating current being reverse into amplitude and changeable frequency flows to motor, drive motor electric operation.
When the load of motor belt motor potential energy or decelerating through motor, at this moment motor can operate in generating state, and energy leads to
The anti-paralleled diode crossing TR1～TR6 returns to dc bus, causes busbar voltage to raise, if not taking to arrange
Execute, converter busbar voltage can be caused too high and report disorderly closedown.General way is to add in converter
Energy-dissipating brake circuit, in Fig. 2 and Fig. 3, TRB is brake pipe.BR1 and BR2 point is the external braking of user
Resistance RB junction point, just constitutes complete energy-dissipating brake circuit, the most such as when external braking resistor RB
Really busbar voltage is increased to certain value, and control circuit will send control command allows audion TRB turn on, electricity
Stream flows through braking resistor RB, and such motor regenerated energy will be with the form consumption of heat in braking resistor RB
On.When detecting that bus voltage value is less than setting value, control circuit can send order allows audion TRB cut
Only, electric current at this moment would not be had in braking resistor RB to flow through.
The buffer module 107 that powers on that switch KM1 and soft start resistance R1 is constituted, is used for limiting powered on moment
Bus capacitor charging current.Its operation principle is, converter powered on moment, switchs KM1 not adhesive, frequency conversion
Bus capacitor is charged by device by soft start resistance R1.When converter detects that busbar voltage arrives certain value,
Controlling switch KM1 adhesive soft start resistance R1 is short-circuit, converter normally works.In converter, by
It is used merely as powered on moment in soft start resistance R1 and limits charging current, and soft start resistance R1 is integrated in
Inside converter, therefore the power of soft start resistance R1 is all more much smaller than braking resistor RB.
The order of audion TRB is opened when brake control module 105 sends, but now braking performance test module 103
It is not detected by audion TRB conducting, then it is assumed that audion TRB fault, converter quits work.This
Situation does not results in the danger that braking resistor RB is burnt.But when brake control module 105 does not send three poles
Pipe TRB opens order, but now braking performance test module 103 detects that audion TRB turns on, this explanation
Audion TRB lost efficacy or fault, had utilized the brake control module 105 of converter this time
Audion TRB can not be turned off.Due to the existence of three-phase input power, busbar voltage can exist, so always
Electric current will be had to flow through in braking resistor RB always, braking resistor RB persistent fever, cause braking resistor
RB burn even burning apparatus, cause fire.
For preventing the generation of this extreme case, thus after detecting that audion TRB short circuit occurs, braking
Control module 105 controls switch KM1 and disconnects, and is sealed in bus circuit by soft start resistance R1.Three poles
Pipe TRB short circuit, after switch KM1 disconnects, braking resistor RB and soft start resistance R1 are equivalent to series connection.
Owing to soft start resistance R1 power is more much smaller than braking resistor RB, therefore soft start resistance R1 first burns,
Soft start resistance R1 can disconnect three-phase input power after burning, thus can play protection braking resistor RB
Effect, soft start resistance R1 burn only result in converter infringement draw without causing peripheral equipment to burn
Play fire.
The braking resistor protection circuit of above-mentioned converter detects brake module 101 by braking performance test module 103
Conducting state with the control instruction of brake control module 105 the most consistent, if brake control module 105
Control instruction is for disconnecting, and detects that the state of brake module 101 is conducting, then it is assumed that brake module 101
Being in short-circuit condition, brake control module 105 controls buffer module 107 and disconnects, thus disconnects brake module
101 with the connection of power supply, it is to avoid braking resistor RB is energized for a long time because brake module 101 short circuit, heating
Accumulate and cause braking resistor RB to be burnt.
Incorporated by reference to Fig. 5.The braking resistor guard method of a kind of converter, comprises the following steps:
Step S110, the control instruction of detection brake pipe.
Step S120, if current control instruction is for disconnecting, then detects the connection status of described brake pipe, wherein,
Brake pipe is connected with described braking resistor RB；If described brake pipe is in the conduction state, then disconnect described braking
The access power supply of pipe；If described brake pipe is off, the most described converter normally works.
Step S130, if described current control instruction is conducting, then detects the connection status of described brake pipe；
If described brake pipe is in the conduction state, the most described converter normally works；If described brake pipe is in disconnection
State, then detect the incoming end of described brake pipe.
The concrete steps accessing power supply disconnecting described brake pipe include:
Buffer circuit is accessed between subcircuits and power supply after braking resistor RB and brake pipe are connected.
When described brake pipe is in short-circuit condition, disconnect described buffer circuit.
Control instruction is for disconnecting, when detecting described brake pipe for conducting, and the short circuit of the most described brake pipe.
The braking resistor guard method of above-mentioned converter, by detecting the control instruction of brake pipe, controls current
Instruction is disconnection, and when the connection status of brake pipe is conducting, then it is assumed that brake pipe is in short-circuit condition, from
And disconnect the access power supply of brake pipe, i.e. disconnect the connection of brake pipe and power supply, it is to avoid braking resistor RB is because of system
Moving tube short circuit and be energized for a long time, heating is accumulated and is caused braking resistor RB to be burnt.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended
Claim is as the criterion.
Claims (6)
1. a braking resistor protection circuit for converter, is used for protecting braking resistor RB to burn because of overheated,
It is characterized in that, lead including the brake module for controlling braking resistor RB, for detecting described brake module
The braking performance test module of on and off open state, for controlling the conducting of described brake module and the control for brake disconnected
Module and for connecting the buffer module of described brake module and power supply；
Described brake module is connected to after connecting with described braking resistor RB between the both positive and negative polarity of power supply, described system
Dynamic model block is also connected with described braking performance test module, and described braking performance test module is with described brake control module even
Connecing, described brake control module is also connected with described buffer module, and described buffer module is connected to described braking
Between module and power supply；
Described braking performance test module detects conducting and the off-state of described brake module, and by the result of detection
Feeding back to described brake control module, described brake control module is for according to being currently sending to described braking mould
Described in the control instruction of block and the output control of described braking performance test module feedback, buffer module leads on and off
Opening, wherein, it is disconnection, described system that described brake control module is sent to the control instruction of described brake module
The result of dynamic detection module feedback is conducting, and the most described brake control module controls described buffer module and disconnects,
Thus disconnect the connection of described brake module and power supply；
Brake module, for controlling the conducting state of braking resistor RB, disconnects system when braking resistor RB is overheated
Galvanic electricity resistance RB and the connection of power supply；
Described buffer module include soft start resistance R1 and switch KM1, described soft start resistance R1 one end with
Power supply connects, and the other end is connected with described brake module, described switch KM1 and described soft start resistance R1
In parallel；Described brake module includes the audion TRB as brake pipe, the emitter stage of described audion TRB
Being connected with power cathode, the colelctor electrode of described audion TRB is connected with positive source by braking resistor RB,
The base stage of described audion TRB is connected with described braking performance test module.
The braking resistor protection circuit of converter the most according to claim 1, it is characterised in that described
Braking performance test module includes divider resistance R2, divider resistance R3 and photo-coupler U1, described photo-coupler
U1 includes light emitting diode D1 and audion Q1, described divider resistance R3 one end and light emitting diode D1
Negative pole connect, the other end is connected with the common port of described braking resistor RB and described brake module, described
The positive pole of optical diode D1 is connected with positive source, the grounded emitter of described audion Q1, described three poles
The colelctor electrode of pipe Q1 is connected with one end of described divider resistance R2, the other end of described divider resistance R2 with
Positive source connects, and the common port of described audion Q1 and described divider resistance R2 is with described brake module even
Connect.
The braking resistor protection circuit of converter the most according to claim 1, it is characterised in that also wrap
Including the rectification module for alternating current power supply is converted into DC source, described rectification module exports DC source,
The positive pole of described DC source is connected with described braking resistor RB, the negative pole of described DC voltage and described buffering
Module connects.
The braking resistor protection circuit of converter the most according to claim 1, it is characterised in that also wrap
Including filtration module, described filtration module one end is connected with described braking resistor RB, the other end and described braking mould
Block connects.
The braking resistor protection circuit of converter the most according to claim 4, it is characterised in that described
Filtration module includes electrochemical capacitor C1 and electrochemical capacitor C2, described electrochemical capacitor C1 and described electrochemical capacitor
C2 connects, and the positive pole of described electrochemical capacitor C1 is connected with described braking resistor RB, described electrochemical capacitor C2
Negative pole be connected with described brake module.
6. a braking resistor guard method for converter, comprises the following steps:
The control instruction of detection brake pipe；
If current control instruction is for disconnecting, then detect the connection status of described brake pipe, wherein, brake pipe with
Braking resistor RB is connected；If described brake pipe is in the conduction state, then disconnect the access power supply of described brake pipe；
If described brake pipe is off, the most described converter normally works；
Described control instruction is for disconnecting, when detecting described brake pipe for conducting, and the short circuit of the most described brake pipe；
If described current control instruction is conducting, then detect the connection status of described brake pipe；If described braking
Managing in the conduction state, the most described converter normally works；If described brake pipe is off, then examine
Survey the incoming end of described brake pipe；
The concrete steps accessing power supply of the described brake pipe of described disconnection include:
Buffering is accessed between subcircuits and power supply after described braking resistor RB and described brake pipe are connected
Circuit；
When described brake pipe is in short-circuit condition, disconnect described buffer circuit.
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| CN104270040A (en) * | 2014-10-11 | 2015-01-07 | 刘思佳 | Frequency converter |
| CN109552056B (en) * | 2017-09-27 | 2021-11-16 | 湖南中车时代电动汽车股份有限公司 | Braking resistance loop and overheating protection method thereof |
| CN108683250A (en) * | 2018-06-27 | 2018-10-19 | 佛山市诺行科技有限公司 | A kind of accumulator switching driving device of lift-sliding parking equipment |
| CN110189960B (en) * | 2019-05-17 | 2021-03-16 | 山东航天电子技术研究所 | Manual brake device for extravehicular astronaut of mechanical arm of space station |
| CN113746381B (en) * | 2021-08-30 | 2023-11-03 | 珠海格力电器股份有限公司 | Braking control device and method of motor and motor |
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| US4737900A (en) * | 1986-05-21 | 1988-04-12 | Kone Elevator Gmbh | Method of and apparatus for controlling the braking resistor of a frequency converter |
| CN1972056A (en) * | 2005-11-23 | 2007-05-30 | 乐金电子(天津)电器有限公司 | Compressor motor drive circuit over-current protection structure |
| CN201566599U (en) * | 2009-11-17 | 2010-09-01 | 深圳职业技术学院 | Automatic cooling device for automobile brake hub |
| CN202488098U (en) * | 2011-12-27 | 2012-10-10 | 北京中纺锐力机电有限公司 | Brake-phase short-circuit detecting, judging and protecting device |
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