CN203932986U - A kind of electric motor car runaway protection circuit - Google Patents
A kind of electric motor car runaway protection circuit Download PDFInfo
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- CN203932986U CN203932986U CN201420188278.1U CN201420188278U CN203932986U CN 203932986 U CN203932986 U CN 203932986U CN 201420188278 U CN201420188278 U CN 201420188278U CN 203932986 U CN203932986 U CN 203932986U
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- xor gate
- contactor
- electrically connected
- semiconductor
- oxide
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Abstract
The utility model provides a kind of electric motor car runaway protection circuit, comprises XOR gate, switch module and D.C. contactor; One input of described XOR gate is coupled between the drain electrode of speed governing metal-oxide-semiconductor and the negative end of motor, another input of described XOR gate is coupled between the grid and pwm control signal output of speed governing metal-oxide-semiconductor, and the output of described XOR gate is electrically connected with described switch module; The main contacts of described D.C. contactor is connected on the forward end of motor, and the sucking coil of described D.C. contactor is electrically connected described switch module; In the time that the drain voltage of speed governing metal-oxide-semiconductor and the voltage of pwm control signal are low level, described XOR gate output control signal, disconnects the power supply circuits of described motor by described D.C. contactor.The utility model is protected the field effect transistor in control circuit, and disconnects motor power in the time that it loses efficacy, and controls vehicle parking, avoids accident to occur.
Description
Technical field
The utility model relates to electrical control field, relates in particular to a kind of circuit that carries out lost-control protection for the power field effect pipe in new energy electric motor vehicle control circuit.
Background technology
Because the energy and environmental problem are subject to people's attention day by day, small-sized electric car recoverable amount is socially increasing.Because lightweight electric powered vehicles power demand is generally upper and lower at 1kW, therefore by storage battery power supply, adopting the chopper circuit being made up of high-power FET MOSFET to adjust motor voltage, great majority carry out the speed control of vehicle.As long as can effectively control the grid voltage of metal-oxide-semiconductor, just can reach the object of regulation speed.
In the control circuit of existing electric motor car, be provided with overheated and current foldback circuit, can effectively reduce the chance of MOSFET tube failure.With reference to figure 1, existing electric motor car control principle drawing, the control voltage being produced by the maneuver control device (the normally speed of a motor vehicle joystick of electric motor car) of electric motor car, the triangle wave voltage being produced by triangular-wave generator; Control voltage and triangle wave voltage through comparator 11 relatively after, obtain frequency and fix and the adjustable rectangle pwm pulse control signal of duty ratio; The voltage of the grid G by pwm pulse control signal control speed governing metal-oxide-semiconductor 18, to adjust the operating voltage of motor 19, and then controls the speed of a motor vehicle of electric motor car.Buffering and current foldback circuit 12 and overheating protection circuit 13 are for pwm pulse control signal being carried out to overheated and overcurrent protection processing, to protect speed governing metal-oxide-semiconductor 18.
But in actual use, the power field effect pipe MOSFET(in electric vehicle control circuit is speed governing metal-oxide-semiconductor 18) lost efficacy phenomenon still happen occasionally.Once the phenomenon that metal-oxide-semiconductor lost efficacy appears in electric motor car, the speed of a motor vehicle is out of hand, and pushes way by shoving or bumping with max. speed, very easily causes security incident.
Utility model content
The purpose of this utility model is to address the above problem, and provides a kind of electric motor car runaway protection circuit, by XOR gate, switch module and D.C. contactor; when high-power FET in control circuit lost efficacy; cut off motor power, control vehicle parking, avoid accident to occur.
For achieving the above object, the utility model provides a kind of electric motor car runaway protection circuit, comprises XOR gate, switch module and D.C. contactor; One input of described XOR gate is coupled between the drain electrode of speed governing metal-oxide-semiconductor and the negative end of motor, another input of described XOR gate is coupled between the grid and pwm control signal output of speed governing metal-oxide-semiconductor, and the output of described XOR gate is electrically connected with described switch module; The main contacts of described D.C. contactor is connected on the forward end of motor, and the sucking coil of described D.C. contactor is electrically connected described switch module; In the time that the drain voltage of speed governing metal-oxide-semiconductor and the voltage of pwm control signal are low level, described XOR gate output control signal, disconnects the power supply circuits of described motor by described D.C. contactor.
Further, described switch module adopts switch MOS pipe, and the grid of described switch MOS pipe is electrically connected the output of described XOR gate, and the drain electrode of described switch MOS pipe is electrically connected the sucking coil of described D.C. contactor, the source ground of described switch MOS pipe; In the time that the drain voltage of speed governing metal-oxide-semiconductor and the voltage of pwm control signal are low level, described XOR gate output low level, described switch MOS pipe cut-off, and then disconnect the power supply circuits of described motor by described D.C. contactor.
Further comprise a unilateral diode, the positive pole of described unilateral diode is electrically connected with the sucking coil of described D.C. contactor, and negative pole is electrically connected with the drain electrode of described switch MOS pipe.
Further comprise resistance and the voltage stabilizing didoe of serial connection; Described resistance is coupled between the drain electrode of described speed governing metal-oxide-semiconductor and an input of described XOR gate, is electrically connected with the positive pole of described voltage stabilizing didoe simultaneously; The minus earth of described voltage stabilizing didoe.
The good effect of the utility model electric motor car runaway protection circuit is: the high-power FET in control circuit is protected, and disconnected motor power in the time that metal-oxide-semiconductor loses efficacy, control vehicle parking, avoid accident to occur.And the utility model circuit design novelty, simple in structure, reliability is high, easy to maintenance, be highly suitable for electric vehicle control circuit, be a kind of new-type circuit that integrates economy and practicality.
Brief description of the drawings
Fig. 1 is existing electric motor car control principle drawing;
Fig. 2 is the utility model electric motor car runaway protection circuit connection diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model electric motor car runaway protection circuit is elaborated.
Referring to accompanying drawing 2, the utility model electric motor car runaway protection circuit, comprises XOR gate 21, switch module 22 and D.C. contactor 23.
One input of described XOR gate 21 is coupled between the drain D of speed governing metal-oxide-semiconductor BT1 and the negative end of motor 29, another input of described XOR gate 21 is coupled between the grid G and pwm control signal output of speed governing metal-oxide-semiconductor BT1, and the output of described XOR gate 21 is electrically connected with described switch module 22.
Wherein, speed governing metal-oxide-semiconductor BT1 adopts high-power FET, adjusts the voltage of motor 29 under the driving of pwm control signal, to carry out the speed control of electric motor car; This is prior art, repeats no more.
The main contacts J of described D.C. contactor 23 is connected on the forward end of motor 29, and the sucking coil of described D.C. contactor 23 is electrically connected described switch module 22.When the sucking coil of D.C. contactor 23 obtains electricly, main contacts J just connects, and when the sucking coil dead electricity of D.C. contactor 23, main contacts J just disconnects.
In the time that the drain voltage of speed governing metal-oxide-semiconductor BT1 and the voltage of pwm control signal are low level, described XOR gate 21 is exported control signal, disconnects the power supply circuits of described motor 29 by described D.C. contactor 23, prevents that the electric motor car speed of a motor vehicle from rising violently rapidly.
In the time that electric motor car normally moves, the driving voltage of BT1 (being the voltage of pwm control signal) and BT1 drain voltage are reciprocal, and XOR gate 21 is exported high-level control signal, switch module 22 conductings, the sucking coil of D.C. contactor 23 powers on, and main contacts J connects, and electric motor car normally moves.In prior art, once there is MOSFET pipe BT1 failure phenomenon in the running of electric motor car, in the time not driving signal (when pwm control signal output is low level), BT1 is also in conducting state, owing to passing through larger drain current, therefore drain voltage is in low level, the electric motor car speed of a motor vehicle is in runaway condition.And the utility model is by XOR gate 21, when drain voltage and the pwm control signal output of BT1 are low level, the output of XOR gate 21 can convert low level in time to, control switch module 22 disconnects, thereby the dead electricity of the sucking coil of D.C. contactor 23, main contacts J disconnects, and then disconnects motor 29 power supplys, control vehicle parking, avoid accident to occur.And the independent running of runaway protection circuit described in the utility model and other two protective circuits (buffering and circuit overcurrent protection and overheating protection circuit), can not influence each other; Thereby BT1 effectively protects to MOSFET pipe.
Preferably, switch module 22 described in the utility model adopts switch MOS pipe BT2, the grid G of described switch MOS pipe BT2 is electrically connected the output of described XOR gate 21, the drain D of described switch MOS pipe BT2 is electrically connected the sucking coil of described D.C. contactor 23, the source S ground connection of described switch MOS pipe BT2.
In the time that electric motor car normally moves, the driving voltage of BT1 and BT1 drain voltage are reciprocal, and XOR gate 21 is exported high level, and BT2 is in conducting state, and the sucking coil of D.C. contactor 23 powers on, and main contacts J connects, and electric motor car normally moves.When the electric motor car speed of a motor vehicle is during in runaway condition, the drain voltage of BT1 and the voltage of pwm control signal are low level, the output of XOR gate 21 can convert low level in time to, control BT2 cut-off, the sucking coil dead electricity of D.C. contactor 23, main contacts J disconnects, thereby disconnects motor 29 power supplys, control vehicle parking, avoid accident to occur.
Electric motor car runaway protection circuit described in the utility model further comprises a unilateral diode D2, and the positive pole of described unilateral diode D2 is electrically connected with the sucking coil of described D.C. contactor 23, and negative pole is electrically connected with the drain D of described switch MOS pipe BT2.In circuit, the effect of D2 is, when the positive-negative polarity of vehicle power supply connects inverse time accidentally, the sucking coil of D.C. contactor 23 cannot be powered on, and main contacts J disconnects, and disconnects motor 29 power supplys, thereby plays the effect of protection.
Electric motor car runaway protection circuit described in the utility model further comprises resistance R and the voltage stabilizing didoe D1 of serial connection.Described resistance R is coupled between the drain D of described speed governing metal-oxide-semiconductor BT1 and an input of described XOR gate 21, is electrically connected with the positive pole of described voltage stabilizing didoe D1 simultaneously; The minus earth of described voltage stabilizing didoe D1.Because the operating voltage of the motor 29 of electric motor car is conventionally high than the operating voltage of control circuit (and voltage of pwm control signal), for preventing that the drain voltage of BT1 from damaging XOR gate 21 when too high, thereby limit the too high input voltage of XOR gate 21 with R and D1 voltage stabilizing branch road in series.
The above is only preferred embodiment of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model structure; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (4)
1. an electric motor car runaway protection circuit, is characterized in that, comprises XOR gate, switch module and D.C. contactor;
One input of described XOR gate is coupled between the drain electrode of speed governing metal-oxide-semiconductor and the negative end of motor, another input of described XOR gate is coupled between the grid and pwm control signal output of speed governing metal-oxide-semiconductor, and the output of described XOR gate is electrically connected with described switch module;
The main contacts of described D.C. contactor is connected on the forward end of motor, and the sucking coil of described D.C. contactor is electrically connected described switch module;
In the time that the drain voltage of speed governing metal-oxide-semiconductor and the voltage of pwm control signal are low level, described XOR gate output control signal, disconnects the power supply circuits of described motor by described D.C. contactor.
2. electric motor car runaway protection circuit according to claim 1, it is characterized in that, described switch module adopts switch MOS pipe, the grid of described switch MOS pipe is electrically connected the output of described XOR gate, the drain electrode of described switch MOS pipe is electrically connected the sucking coil of described D.C. contactor, the source ground of described switch MOS pipe; In the time that the drain voltage of speed governing metal-oxide-semiconductor and the voltage of pwm control signal are low level, described XOR gate output low level, described switch MOS pipe cut-off, and then disconnect the power supply circuits of described motor by described D.C. contactor.
3. electric motor car runaway protection circuit according to claim 2; it is characterized in that; further comprise a unilateral diode, the positive pole of described unilateral diode is electrically connected with the sucking coil of described D.C. contactor, and negative pole is electrically connected with the drain electrode of described switch MOS pipe.
4. electric motor car runaway protection circuit according to claim 2, is characterized in that, further comprises resistance and the voltage stabilizing didoe of serial connection; Described resistance is coupled between the drain electrode of described speed governing metal-oxide-semiconductor and an input of described XOR gate, is electrically connected with the positive pole of described voltage stabilizing didoe simultaneously; The minus earth of described voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420188278.1U CN203932986U (en) | 2014-04-18 | 2014-04-18 | A kind of electric motor car runaway protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420188278.1U CN203932986U (en) | 2014-04-18 | 2014-04-18 | A kind of electric motor car runaway protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203932986U true CN203932986U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420188278.1U Expired - Fee Related CN203932986U (en) | 2014-04-18 | 2014-04-18 | A kind of electric motor car runaway protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649133A (en) * | 2015-12-31 | 2016-06-08 | 太原重工股份有限公司 | Mining mechanical face shovel type excavator and bulldozing mechanism out-of-control protection method and device thereof |
-
2014
- 2014-04-18 CN CN201420188278.1U patent/CN203932986U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649133A (en) * | 2015-12-31 | 2016-06-08 | 太原重工股份有限公司 | Mining mechanical face shovel type excavator and bulldozing mechanism out-of-control protection method and device thereof |
| CN105649133B (en) * | 2015-12-31 | 2018-08-17 | 太原重工股份有限公司 | Mine mechanical face digger and its dipper crowding gear lost-control protection method, apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20170418 |
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| CF01 | Termination of patent right due to non-payment of annual fee |