CN103855677B - A kind of ground fault protection circuit of the controller of current vortex retarder - Google Patents
A kind of ground fault protection circuit of the controller of current vortex retarder Download PDFInfo
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- CN103855677B CN103855677B CN201410023906.5A CN201410023906A CN103855677B CN 103855677 B CN103855677 B CN 103855677B CN 201410023906 A CN201410023906 A CN 201410023906A CN 103855677 B CN103855677 B CN 103855677B
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Abstract
The invention relates to the ground fault protection circuit of the controller of a kind of current vortex retarder, including: voltage comparator, absorption capacitor, the first resistor, the second resistor, the 3rd resistor, Transient Suppression Diode and clamp diode.When there is earth fault in the earth terminal of the controller of current vortex retarder, the magnitude of voltage of a forward can be formed at the pin of the second input of voltage comparator, the magnitude of voltage of this forward is bigger than the magnitude of voltage that the first resistor device and the second resistor divider are formed at voltage comparator first input end pin, voltage comparator overturns, stop trigger voltage flowing to MOSFET pipe, to reach to stop its work, it is ensured that the overload voltage that MOSFET pipe is not occurred because of earth fault burns.The absorption capacitor of the protection circuit of voltage comparator and clamp diode ensure that voltage comparator is not damaged by long-term work.
Description
Technical field
The invention belongs to automobile current vortex retarder technical field, particularly relate to a kind of electric vortex buffering
The ground fault protection circuit of the controller of device.
Background technology
Current vortex retarder is a kind of auxiliary brake of vehicle, is installed in vehicle drive system, uses
In vehicle auxiliary braking.The use of current vortex retarder is remarkably improved the safety of car operation, relaxes
Adaptive, reduces motor vehicle braking system and the maintenance of tire, replacement cost, making an uproar when alleviating car braking
Sound and dust pollution.
The controller of current vortex retarder is the important component part of current vortex retarder, for analyze and
Process the various signals that arrive of sensor acquisition, and export certain command signal and make retarder action.Mesh
The control on-off mode of the controller of front current vortex retarder mainly has two kinds: 1, relay switch controls,
2, high power module on-off control (metal-oxide-semiconductor).Wherein, high power module on-off control delays at current vortex
When unsettled or situation that imperfect earth is good occurs in the earth terminal of the controller of speed device, controller continues work
Work can make the tube voltage drop moment of high power module exceed its maximum and bear voltage, causes it to burn, even
Cause fire, have a strong impact on the safety of vehicle and personnel.
In view of this, the design people manufactures practical experience abundant for many years based on being engaged in this type of product design
And Professional knowledge, and coordinate the utilization of scientific principle, the most in addition research and innovation, a kind of novel to founding
The ground fault protection circuit of the controller of the current vortex retarder of structure so that it is can improve general existing
The controller of some current vortex retarders using high power module on-off control so that it is have more practicality
Property.Through constantly research, design, and after repeatedly studying sample and improving, finally create really
The present invention having practical value.
Summary of the invention
It is an object of the invention to, overcome the defect that prior art exists, and a kind of new structure is provided
The ground fault protection circuit of controller of current vortex retarder, to be solved technical problem is that makes
It can when the controller imperfect earth of current vortex retarder or ground connection disconnect the work of interrupt control unit
Making, the controller making current vortex retarder is more stable, safer in application, is very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.Foundation
The ground fault protection circuit of the controller of a kind of current vortex retarder that the present invention proposes, comprising: electric
Pressure comparator, absorption capacitor, the first resistor, the second resistor, the 3rd resistor, transient state press down
Diode processed and clamp diode；Wherein, the plus earth of described Transient Suppression Diode, described
The negative pole of Transient Suppression Diode is electrically connected with, as institute with the source electrode of the MOSFET pipe of described controller
State the outfan of controller；First end of described first resistor receives driving voltage, described first electricity
First end of the second end and described second resistor of resistance device is electrically connected with, the of described second resistor
Two ends are electrically connected with the negative pole of described Transient Suppression Diode；First input of described voltage comparator
End with described first resistor second end be electrically connected with, the second input of described voltage comparator with
First end of described 3rd resistor is electrically connected with, the second end of described 3rd resistor and described transient state
The positive terminal of suppression diode is electrically connected with；The outfan of described voltage comparator is managed with described MOSFET
Grid be electrically connected with, trigger output voltage trigger described MOSFET pipe work；Described absorption capacitor
The second end of the first end and described second resistor be electrically connected with, the second end of described absorption capacitor
It is electrically connected with the first end of described 3rd resistor；The positive pole of described clamp diode and described second
Second end of resistor is electrically connected with, the of the negative pole of described clamp diode and described 3rd resistor
One end is electrically connected with；The drain electrode of described MOSFET pipe is connected with DC source, receives DC voltage.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The ground fault protection circuit of the controller of aforesaid current vortex retarder, wherein said unidirectional current
The DC source that source provides for automobile.
The ground fault protection circuit of the controller of aforesaid current vortex retarder, wherein said controller
Outfan be connected with retarder coil, the first end of described retarder coil and described MOSFET pipe
Source electrode is electrically connected with, the second end ground connection of described retarder coil.
The ground fault protection circuit of the controller of aforesaid current vortex retarder, wherein said first electricity
First end of resistance device is connected with the outfan of the DRV chip with 8 pins, receives described driving electricity
Pressure.
The ground fault protection circuit of the controller of aforesaid current vortex retarder, wherein said clamper two
Pole pipe is Schottky diode.
The ground fault protection circuit of the controller of aforesaid current vortex retarder, wherein said MOSFET
Pipe is FDP5800.
The present invention compared with prior art has clear advantage and beneficial effect.By above-mentioned technical side
Case, the ground fault protection circuit of the controller of a kind of current vortex retarder of the present invention at least has following
Advantage and beneficial effect: the protection circuit of the present invention is prevented from the controller of current vortex retarder and is going out
(earth fault i.e. refers to that the earth terminal of controller of current vortex retarder is unsettled or connects to existing earth fault
The best situation in ground) time high power module be burned out, it is achieved that the controller to current vortex retarder
Protection, can make that the controller of current vortex retarder is more stable, safer in application, the life-span more
Long, stopping works in the case of controller imperfect earth causes the situation of accident, low cost, effect
Good.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the present invention's
Technological means, and can being practiced according to the content of description, and in order to allow the above-mentioned of the present invention and
Other objects, features and advantages can become apparent, and below especially exemplified by preferred embodiment, and coordinates attached
Figure, describes in detail as follows.
Accompanying drawing explanation
Fig. 1 is the principle signal of the ground fault protection circuit of the controller of current vortex retarder of the present invention
Figure.
VT1:MOSFET pipe C1: Absorption Capacitance
VD2: clamp diode VD1: Transient Suppression Diode
N1: voltage comparator VIN: DC voltage
DRV: driving voltage L1: retarder coil
R1: the first resistor the R2: the second resistor
The earth point of the R3: the three resistor A: controller
The output point of earth point C: the controller of B: retarder coil
Detailed description of the invention
By further illustrating the technological means and merit that the present invention taked by reaching predetermined goal of the invention
Effect, below in conjunction with accompanying drawing and preferred embodiment, to a kind of current vortex retarder proposed according to the present invention
Its detailed description of the invention of the ground fault protection circuit of controller, structure, feature and effect thereof, in detail
After illustrating such as.
For the present invention aforementioned and other technology contents, feature and effect, coordinate with reference to figure following
The detailed description of the preferred embodiment of formula can clearly appear from.By the explanation of detailed description of the invention, should
When the technological means present invention can taked by reaching predetermined purpose and effect obtain one more deeply and
Concrete understanding, but institute's accompanying drawings is only to provide reference and purposes of discussion, is not used for the present invention
It is any limitation as.
Refer to shown in Fig. 1, be the earth-fault protection electricity of the controller of current vortex retarder of the present invention
The principle schematic on road.The ground fault protection circuit of the controller of current vortex retarder of the present invention is main
By voltage comparator N1, absorption capacitor C1, the first resistor R1, the second resistor R2, the 3rd
Resistor R3, Transient Suppression Diode VD1 and clamp diode VD2 composition.Wherein, transient state suppression
The MOSFET pipe of the plus earth of diode VD1, the negative pole of Transient Suppression Diode VD1 and controller
The source S of VT1 is electrically connected with, as the outfan of controller.First end of the first resistor R1 receives
Second end of driving voltage DRV, the first resistor R1 and first end of the second resistor R2 are electrically connected with,
Second end of the second resistor R2 is electrically connected with the negative pole end of Transient Suppression Diode VD1.Voltage ratio
Second end of the first input end (pin) 3 and the first resistor R1 of relatively device N1 is electrically connected with, voltage
First end of second input (pin) 2 and the 3rd resistor R3 of comparator N1 is electrically connected with, the
Second end of three resistor R3 is electrically connected with the positive pole of Transient Suppression Diode VD1.Voltage comparator
The outfan (pin) 1 of N1 is electrically connected with the grid G of MOSFET pipe VT1, trigger output voltage
Trigger MOSFET pipe VT1 work.First end of absorption capacitor C1 and the second of the second resistor R2
End is electrically connected with, and second end of absorption capacitor C1 and first end of the 3rd resistor R3 are electrically connected with.
The positive pole of clamp diode VD2 and second end of the second resistor R2 are electrically connected with, clamp diode VD2
Negative pole and the 3rd resistor R3 first end be electrically connected with.The drain D of MOSFET pipe VT1 and direct current
Power supply connects, and receives DC voltage VIN.The outfan of controller is connected with retarder coil L1, its
In, first end of retarder coil L1 is electrically connected with the source S of MOSFET pipe, retarder coil
The second end ground connection of L1.
The DC source of the present invention is the DC source that can provide with automobile.First resistor of the present invention
First end of R1 can be that the outfan with the DRV chip with 8 pins is connected, and receives and drives electricity
Pressure DRV.The clamp diode VD2 of the present invention can be Schottky diode.The MOSFET of the present invention
Pipe VT1 can be FDP5800.The Transient Suppression Diode VD1 of the present invention can be that high-power transient state presses down
Diode processed.
As it is shown in figure 1, in normal operation, A point is good with B point ground connection, voltage comparator
Second outfan (pin) 2 of N1 is connected with A point does not has voltage, and voltage comparator N1 is not just overturning
Often work, driving voltage DRV is input voltage after the first resistor R1 and the second resistor R2 dividing potential drop
Comparator N1, by outfan (pin) 1 trigger output voltage of voltage comparator N1 to MOSFET
Pipe VT1, triggers MOSFET pipe VT1 and normally works, and the direction that flows through of electric current is to B point by C point.
When earth fault occurs in controller, i.e. when the disconnection of A point ground connection or imperfect earth, MOSFET
Pipe VT1 still can be controlled electric current by outfan OUT output, and now the direction that flows through of electric current is by A point to B
Point, electric current forms tube voltage drop when flowing through Transient Suppression Diode VD1, has a 0.2V's at A point
Voltage, now the voltage of second input (pin) 2 of comparator N1 is also 0.2V, the first resistance
Device R1 and the second resistor R2 is connected shape between driving voltage DRV and the outfan OUT of controller
Becoming dividing potential drop V1 (0.05V), the magnitude of voltage of second input (pin) 2 of voltage comparator N1 is more than
V1, voltage comparator N1 overturn, and the outfan (pin) 1 of voltage comparator N1 stops output being triggered
Voltage, MOSFET pipe VT1 quits work, thus protect in this state MOSFET pipe VT1 not by
Overload voltage burns.In the moment that earth fault occurs, with the second input (pipe of voltage comparator N1
Foot) the 2 clamp diode VD2 being electrically connected with and Absorption Capacitance C1, can be by the voltage clamp of C point
0.7V, and filter shape, to protect voltage comparator N1 not punctured by moment, it is ensured that it is permanently effective
Normal work.
For there is no the controller of ground fault protection circuit of the present invention, in the moment that earth fault occurs,
It is contrary with during normal work that the electric current of controller flows through direction, but controller remains to normally work, now
The tube voltage drop of MOSFET pipe can now work on can cause control more than the maximum pressure voltage of MOSFET pipe
The device of device processed burns.And for having the controller of ground fault protection circuit of the present invention, connect occurring
The moment of earth fault, voltage comparator N1 can sample and afterwards turn over, and stops driving MOSFET pipe VT1
Dynamic so that it is to quit work.Therefore the earth-fault protection of the controller of the current vortex retarder of the present invention
When circuit is prevented from earth fault, high power module is burned out, and realizes the control to current vortex retarder
The protection of device, can make that the controller of current vortex retarder is more stable, safer in application, the life-span more
Long, improving works in the case of controller imperfect earth causes the situation of accident, and it is with low cost,
Effect is obvious.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any form
On restriction, although the present invention is disclosed above with preferred embodiment, but is not limited to this
Bright, any those skilled in the art, in the range of without departing from technical solution of the present invention, when can profit
Make a little change with the technology contents of the disclosure above or be modified to the Equivalent embodiments of equivalent variations, but
Every without departing from technical solution of the present invention content, the technical spirit of the foundation present invention is to above example institute
Any simple modification, equivalent variations and the modification made, all still falls within the range of technical solution of the present invention.
Claims (6)
1. the ground fault protection circuit of the controller of a current vortex retarder, it is characterised in that its bag
Include: voltage comparator, absorption capacitor, the first resistor, the second resistor, the 3rd resistor,
Transient Suppression Diode and clamp diode；
Wherein, the plus earth of described Transient Suppression Diode, the negative pole of described Transient Suppression Diode
It is electrically connected with, as the outfan of described controller with the source electrode of the MOSFET pipe of described controller；
Described first resistor first end receive driving voltage, the second end of described first resistor with
First end of described second resistor is electrically connected with, the second end of described second resistor and described transient state
The negative pole of suppression diode is electrically connected with；
The first input end of described voltage comparator is electrically connected with the second end of described first resistor,
Second input of described voltage comparator is electrically connected with the first end of described 3rd resistor, described
Second end of the 3rd resistor is electrically connected with the positive terminal of described Transient Suppression Diode；Described voltage
The outfan of comparator is electrically connected with the grid of described MOSFET pipe, and trigger output voltage triggers described
MOSFET pipe works；
First end of described absorption capacitor is electrically connected with the second end of described second resistor, described
Second end of absorption capacitor is electrically connected with the first end of described 3rd resistor；
The positive pole of described clamp diode is electrically connected with the second end of described second resistor, described pincers
The negative pole of position diode is electrically connected with the first end of described 3rd resistor；
The drain electrode of described MOSFET pipe is connected with DC source, receives DC voltage.
The ground fault protection circuit of the controller of current vortex retarder the most according to claim 1,
It is characterized in that the DC source that wherein said DC source provides for automobile.
The ground fault protection circuit of the controller of current vortex retarder the most according to claim 1,
It is characterized in that the outfan of wherein said controller is connected with retarder coil, described retarder coil
The source electrode of the first end and described MOSFET pipe be electrically connected with, the second end ground connection of described retarder coil.
The ground fault protection circuit of the controller of current vortex retarder the most according to claim 1,
The first end that it is characterized in that wherein said first resistor is defeated with the DRV chip with 8 pins
Go out end to connect, receive described driving voltage.
The ground fault protection circuit of the controller of current vortex retarder the most according to claim 1,
It is characterized in that wherein said clamp diode is Schottky diode.
The ground fault protection circuit of the controller of current vortex retarder the most according to claim 1,
It is characterized in that wherein said MOSFET pipe is FDP5800.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410023906.5A CN103855677B (en) | 2014-01-17 | 2014-01-17 | A kind of ground fault protection circuit of the controller of current vortex retarder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410023906.5A CN103855677B (en) | 2014-01-17 | 2014-01-17 | A kind of ground fault protection circuit of the controller of current vortex retarder |
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| CN103855677A CN103855677A (en) | 2014-06-11 |
| CN103855677B true CN103855677B (en) | 2016-08-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050982U (en) * | 1989-08-05 | 1990-01-10 | 蔡志钢 | Multifunctional electronic electric-tester |
| US5606480A (en) * | 1994-05-10 | 1997-02-25 | "Nevo" Electricity And Electronics Industries (1994) Ltd. | Detector for monitoring the integrity of a ground connection to an electrical appliance |
| CN101239590A (en) * | 2008-03-10 | 2008-08-13 | 江蕴梅 | Intelligent control driver for electric eddy speed damper and its control method |
| CN101762773A (en) * | 2010-01-19 | 2010-06-30 | 山东科汇电力自动化有限公司 | Detection method and detection device for ground protection of high-voltage equipment |
| CN202564932U (en) * | 2011-11-30 | 2012-11-28 | 凯迈(洛阳)电子有限公司 | Protection circuit for eddy current retarder controller |
| CN203761021U (en) * | 2014-01-17 | 2014-08-06 | 凯迈(洛阳)电子有限公司 | Grounding fault protection circuit for controller of eddy current retarder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8710850B2 (en) * | 2010-12-27 | 2014-04-29 | Renault S.A.S. | System and method for detecting an earth ground fault of an external power supply connected to a vehicle |
-
2014
- 2014-01-17 CN CN201410023906.5A patent/CN103855677B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050982U (en) * | 1989-08-05 | 1990-01-10 | 蔡志钢 | Multifunctional electronic electric-tester |
| US5606480A (en) * | 1994-05-10 | 1997-02-25 | "Nevo" Electricity And Electronics Industries (1994) Ltd. | Detector for monitoring the integrity of a ground connection to an electrical appliance |
| CN101239590A (en) * | 2008-03-10 | 2008-08-13 | 江蕴梅 | Intelligent control driver for electric eddy speed damper and its control method |
| CN101762773A (en) * | 2010-01-19 | 2010-06-30 | 山东科汇电力自动化有限公司 | Detection method and detection device for ground protection of high-voltage equipment |
| CN202564932U (en) * | 2011-11-30 | 2012-11-28 | 凯迈(洛阳)电子有限公司 | Protection circuit for eddy current retarder controller |
| CN203761021U (en) * | 2014-01-17 | 2014-08-06 | 凯迈(洛阳)电子有限公司 | Grounding fault protection circuit for controller of eddy current retarder |
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|---|---|
| CN103855677A (en) | 2014-06-11 |
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