CN202550470U - System for safely switching on and off high-voltage circuit - Google Patents
System for safely switching on and off high-voltage circuit Download PDFInfo
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- CN202550470U CN202550470U CN2012202065755U CN201220206575U CN202550470U CN 202550470 U CN202550470 U CN 202550470U CN 2012202065755 U CN2012202065755 U CN 2012202065755U CN 201220206575 U CN201220206575 U CN 201220206575U CN 202550470 U CN202550470 U CN 202550470U
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Abstract
The utility model discloses a system for safely switching on and off a high-voltage circuit. The system is used for safely switching on and off the high-voltage circuit of an electric automobile. The system comprises an electronic control unit, a first high-voltage circuit, a relay, a second high-voltage circuit and a time sequence control circuit, wherein the electronic control unit is used for transmitting a high-voltage circuit switching-on signal or a high-voltage circuit switching-off signal; the first high-voltage circuit, the relay and the second high-voltage circuit are used for switching on or off a power battery and a motor; and the time sequence control circuit is used for controlling the switching-on of the first high-voltage circuit after receiving the high-voltage circuit switching-on signal, controlling the switching-on of the relay if a current change rate detected by a current sensor is lower than a threshold value, controlling the switching-off of the first high-voltage circuit if the current change rate detected by the current sensor is lower than the threshold value, controlling the switching-on of the second high-voltage circuit after receiving the high-voltage circuit switching-off signal, controlling the switching-off of the relay, and controlling the switching-off of the second high-voltage circuit if the current change rate detected by the current sensor is lower than the threshold value.
Description
Technical field
The utility model relates to the auto electric technical field, particularly a kind of system that realizes high-tension circuit safety break-make electricity.
Background technology
Modern electro electrical automobile, littler than conventional truck because of its influence to environment, prospect is good by extensively, and according to standard GB/T 19596 regulations, electric automobile comprises pure electric automobile, mixed power electric car, FC-EV.The direct voltage of modern used for electric vehicle electrokinetic cell reaches more than the 300V, so the fail safe of circuit connecting and disconnecting between electrokinetic cell and the drive motors is significant for the long-time safe and stable operation of electric automobile with stability.
In the prior art, what electric automobile adopted the control of high-tension circuit is to utilize low-voltage circuit control high-voltage electric switch, realizes the break-make of high-tension circuit.The high-voltage electric switch that electric automobile can adopt mainly comprises metal-oxide layer-semiconductor-field-effect transistor; Be called for short metal-oxide half field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor; MOSFET), insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), four kinds on traditional high-current relay and high energy relay.Referring to shown in Figure 1; It is a kind of circuit diagram of realizing high-tension circuit break-make electricity in the prior art; Its operation principle is that sequential control circuit is according to electronic control unit (Electronic Control Unit; ECU) control signal is switched on or switched off high-voltage electric switch, realizes the break-make of high-tension circuit, and sequential control circuit provides power supply by storage battery for it.
Yet, use MOSFET and IGBT bigger as the high-voltage switch gear contact loss, influence electrokinetic cell service time.The tradition high-current relay has the advantage that contact loss is little, cost is low; But when being applied to the realization high-tension circuit break-make electricity circuit of prior art; Voltage difference at the relay two ends is the magnitude of voltage of electrokinetic cell all the time, can produce electric arc in the process that circuit switches on and off.Electric arc is that ifs circuit voltage lies prostrate greater than 10-20 when the device for switching turn-off current, and electric current just can produce electric arc greater than 80-100mA between the dynamic and static contact of electrical equipment.Though this moment, contact separated, but electric current continues circulation through the electric arc between contact, until contact is separated into enough distances, behind the arc extinction, circuit just breaks off.Therefore, use high-current relay to have dangerous and fragile power consumption equipment as high-voltage switch gear.And use the high energy relay, can be good at eliminating electric arc but cost than higher.In addition, the circuit of prior art control high-tension circuit break-make electricity does not have safeguard measure between electronic control unit ECU and sequential control circuit, be prone to make ECU to receive flow-reversing impingement.
The utility model content
In view of this, the main purpose of the utility model provides a kind of system that realizes high-tension circuit safety break-make electricity, may produce electric arc when solving prior art mesohigh connecting and disconnecting of the circuit electricity and makes the problem of the fragile and dangerous property of power consumption equipment.
For addressing the above problem, the technical scheme that the utility model provides is following:
A kind of system that realizes high-tension circuit safety break-make electricity, said system comprises: electronic control unit, sequential control circuit, first high-tension circuit, relay, second high-tension circuit and current sensor;
Said electronic control unit links to each other with said sequential control circuit; Said first high-tension circuit links to each other with said sequential control circuit; Said relay links to each other with said sequential control circuit; Said second high-tension circuit links to each other with said sequential control circuit; Said first high-tension circuit, said relay and said second high-tension circuit are connected in parallel between electrokinetic cell and the motor, and said current sensor is arranged between said first high-tension circuit, said relay and said second high-tension circuit sys node and the said motor, links to each other with said sequential control circuit;
Said electronic control unit is used for sending connection high-tension circuit signal or breaking off the high-tension circuit signal to said sequential control circuit;
Said first high-tension circuit is used to be switched on or switched off said electrokinetic cell and said motor;
Said relay is used to be switched on or switched off said electrokinetic cell and said motor;
Said second high-tension circuit is used to be switched on or switched off said electrokinetic cell and said motor;
Said current sensor is used to detect the electric current between said electrokinetic cell and the said motor;
Said sequential control circuit after being used to receive the connection high-tension circuit signal of said electronic control unit transmission, is controlled said first high-tension circuit and is connected; After said first high-tension circuit is connected,, connects the current changing rate that said current sensor senses arrives if, then controlling said relay less than threshold value; After said relay is connected,, breaks off the current changing rate that said current sensor senses arrives if, then controlling said first high-tension circuit less than threshold value; After receiving the disconnection high-tension circuit signal of said electronic control unit transmission, control second high-tension circuit and connect; After said second high-tension circuit is connected, control said relay and break off; If, then controlling said second high-tension circuit less than threshold value, breaks off the current changing rate that said current sensor senses arrives.
Accordingly, said first high-tension circuit comprises: first FET and adjusting resistance;
The grid of said first FET links to each other with said sequential control circuit, and drain electrode links to each other with an end of said adjusting resistance, and source electrode links to each other with said motor, and the other end of said adjusting resistance links to each other with said electrokinetic cell;
Said first FET is used to be switched on or switched off said first high-tension circuit;
Said adjusting resistance is used to limit the electric current of said first high-tension circuit.
Accordingly, said second high-tension circuit comprises: second FET and diode;
The grid of said second FET links to each other with said sequential control circuit, and drain electrode links to each other with said electrokinetic cell, and source electrode links to each other with said motor, and the positive pole of said diode links to each other with said motor, and negative pole links to each other with said electrokinetic cell;
Said second FET is used to be switched on or switched off said second high-tension circuit;
Said diode is used for after said second FET breaks off, arriving the electric current between said motor by said electrokinetic cell.
Accordingly, said sequential control circuit specifically is used for:
After receiving the connection high-tension circuit signal of said electronic control unit transmission, control said first FET and connect; After said first FET is connected,, connects the current changing rate that said current sensor senses arrives if, then controlling said relay less than threshold value; After said relay is connected,, breaks off the current changing rate that said current sensor senses arrives if, then controlling said first FET less than threshold value; After receiving the disconnection high-tension circuit signal of said electronic control unit transmission, control said second FET and connect; After said second FET is connected, control said relay and break off; If, then controlling said second FET less than threshold value, breaks off the current changing rate that said current sensor senses arrives.
Accordingly, said system also comprises:
The optocoupler unit is connected between said electronic control unit and the said sequential control circuit, is used for insulating electron control unit and said sequence circuit.
Accordingly, said first FET is MOSFET or IGBT.
Accordingly, said second FET is MOSFET or IGBT.
Accordingly, said relay is traditional high-current relay.
Accordingly, said current sensor is the Hall-type current sensor.
This shows, the utlity model has following beneficial effect:
The order of the connecting and disconnecting through controlling first high-tension circuit, relay, second high-tension circuit, the electric arc that produces in the time of can effectively eliminating relay and switch on and off makes high-tension circuit when the break-make electricity, have higher safety and stability; In addition, use traditional high-current relay to be switched on or switched off the high-tension circuit between electrokinetic cell and motor, guaranteeing that cost reduces on the basis of security and stability, and contact loss is little, can prolong electrokinetic cell service time; And, having increased the optocoupler unit, the protection electronic control unit does not receive the influence of high tension loop.
Description of drawings
Fig. 1 is a structural representation of realizing high-tension circuit break-make electric system in the prior art;
Fig. 2 is the structural representation that the utility model is realized the system of high-tension circuit safety break-make electricity;
Fig. 3 is a kind of concrete structure sketch map that the utility model is realized the system of high-tension circuit safety break-make electricity.
Embodiment
For above-mentioned purpose, the feature and advantage that make the utility model can be more obviously understandable, the utility model embodiment is done further detailed explanation below in conjunction with accompanying drawing and embodiment.
The utility model is realized the system of high pressure break-make electricity; Thereby possibly produce the problem that electric arc makes easy damage of power consumption equipment and dangerous property during to prior art mesohigh connecting and disconnecting of the circuit electricity; Two high-pressure passage between electrokinetic cell and motor, have been increased; The order that high-pressure passage through sequential control circuit control relay and increase is switched on or switched off realizes that high tension loop is switched on or switched off safely and steadly, prevents the generation of electric arc.
Referring to shown in Figure 2, be the system configuration sketch map that the utility model is realized high-tension circuit safety break-make electricity, this system comprises: electronic control unit 1, sequential control circuit 2, first high-tension circuit 3, relay 4, second high-tension circuit 5 and current sensor 6.
Wherein, Electronic control unit 1 links to each other with sequential control circuit 2, and first high-tension circuit 3 links to each other with sequential control circuit 2, and relay 4 links to each other with sequential control circuit 2; Second high-tension circuit 5 links to each other with sequential control circuit 2; First high-tension circuit 3, relay 4 and second high-tension circuit 5 are connected in parallel between electrokinetic cell and the motor, and current sensor 6 is arranged between the sys node and motor of first high-tension circuit 3, relay 4 and second high-tension circuit 5, links to each other with sequential control circuit 2;
First high-tension circuit 3 is used to be switched on or switched off electrokinetic cell and motor;
Second high-tension circuit 5 is used to be switched on or switched off electrokinetic cell and motor;
Referring to shown in Figure 3, be a kind of concrete implementation structure sketch map that the utility model is realized the system of high-tension circuit safety break-make electricity.
First high-tension circuit 3 can comprise: first FET 31 and adjusting resistance 32.The grid of first FET links to each other with sequential control circuit, and drain electrode links to each other with an end of regulating resistance, and source electrode links to each other with motor, and the other end of regulating resistance links to each other with electrokinetic cell;
First FET 31 is used to be switched on or switched off first high-tension circuit;
Regulate resistance 32, be used to limit the electric current of first high-tension circuit.
Regulate resistance 32 and connect with first FET 31, play current limliting, prevent that first FET from burning because of electric current is excessive, regulating resistance is the resistance adjustable resistance.
Second high-tension circuit 5 comprises: second FET 51 and diode 52.The grid of second FET links to each other with sequential control circuit, and drain electrode links to each other with electrokinetic cell, and source electrode links to each other with motor, and the positive pole of diode links to each other with motor, and negative pole links to each other with electrokinetic cell;
Second FET 51 is used to be switched on or switched off second high-tension circuit;
First FET and second FET can be MOSFET, also can be IGBT, but because the MOSFET response speed is very fast, therefore first FET and second FET are preferentially selected MOSFET for use.
Adopt the system of said high-tension circuit safety break-make electricity, relay can be traditional high-current relay, thereby can on the basis that guarantees security and stability, reduce cost.
Current sensor can be the Hall-type current sensor, also can be the current sensor of other types, and in concrete the application, the Hall-type current sensor is comparatively common, and current sensor is preferentially selected the Hall-type current sensor for use.
Sequential control circuit can provide power supply for it by the 24V storage battery.
Control first high-tension circuit and connect to connect through control first FET and realize, control first high-tension circuit and break off and to break off and realizing through controlling first FET; Same; Control the connection of second high-tension circuit and can control second FET connection realization; Control the disconnection of second high-tension circuit and can control second FET disconnection realization; Therefore sequential control circuit 2 can specifically be used for: after receiving the connection high-tension circuit signal of electronic control unit transmission, control first FET and connect; After first FET is connected, if the current changing rate that current sensor senses arrives less than threshold value, then control relay is connected; After relay is connected,, breaks off the current changing rate that current sensor senses arrives if, then controlling first FET less than threshold value; After receiving the disconnection high-tension circuit signal of electronic control unit transmission, control second FET and connect; After second FET was connected, control relay broke off; If, then controlling second FET less than threshold value, breaks off the current changing rate that current sensor senses arrives.
The operation principle of native system is:
After sequential control circuit 2 receives the connection high-tension circuit signal of electronic control unit 1 transmission, control first FET 31 and connect; After first FET is connected, if current sensor 6 detected current changing rates less than threshold value, then control relay 4 is connected; After relay is connected,, break off current sensor 6 detected current changing rates if, then controlling first FET 31 less than threshold value.
Said process is the process that the control high-tension circuit is connected; Before relay was used to connect electrokinetic cell and motor, sequential control circuit was at first controlled first FET and is connected, treat that high-tension circuit between electrokinetic cell and motor is stable after; Be that the electric current variation is very little; If just the current changing rate that arrives of current sensor senses is less than threshold value, control relay is connected again, and this moment is because the voltage at relay two ends is almost equal; Can not produce electric arc, thereby reach the purpose of eliminating electric arc when high-tension circuit is connected.Relay connect and high-tension circuit stable after, promptly the current changing rate that arrives of current sensor senses is controlled first FET and is broken off less than threshold value, accomplishes the connection process of electrokinetic cell and motor.
After sequential control circuit 2 receives the disconnection high-tension circuit signal of electronic control unit 1 transmission, control second FET 51 and connect; After second FET was connected, control relay 4 broke off; If, then controlling second FET 51 less than threshold value, break off current sensor 6 detected current changing rates.
Said process is the process that the control high-tension circuit breaks off, and sequential control circuit is at first controlled second FET and connected, treat that second FET is connected after; The sequential control circuit control relay breaks off, and can not produce electric arc because the relay voltage is equal this moment; After treating that high-tension circuit is stable, promptly the current changing rate that arrives of current sensor senses is less than threshold value, and sequential control circuit is controlled second FET and broken off; Because diode is according to the direction of applied voltage; The transport properties that possesses unidirectional current, circuit impacted and can eliminate through diode this moment, thereby reached the purpose in safety and stability cutoff high loop.
High-tension circuit between electrokinetic cell and motor is finally connected by relay, and contact loss can be ignored.FET, for example MO S FET is a semiconductor element, and certain resistance is arranged when conducting, has energy loss when electric current flows through, just contact loss.In the system of the utility model the turn-on time of FET very short, contact loss is very little, so the utility model can prolong the service time of electrokinetic cell.
In addition, the utility model is realized the system of high-tension circuit break-make electricity, also comprises: optocoupler unit 7, be connected between electronic control unit 1 and the sequential control circuit 2, and be used for insulating electron control unit and said sequence circuit.The optocoupler unit is the media transmission signal of telecommunication with light, the signal one-way transmission, and input does not have the direct of circuit to be connected with output; Realized electrical isolation fully; The output signal does not have influence to input, and antijamming capability is strong, can protect electronic control unit not receive the influence of high-tension circuit.
Need to prove that each embodiment adopts the mode of going forward one by one to describe in this specification, what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
Also need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. a system that realizes high-tension circuit safety break-make electricity is characterized in that said system comprises: electronic control unit, sequential control circuit, first high-tension circuit, relay, second high-tension circuit and current sensor;
Said electronic control unit links to each other with said sequential control circuit; Said first high-tension circuit links to each other with said sequential control circuit; Said relay links to each other with said sequential control circuit; Said second high-tension circuit links to each other with said sequential control circuit; Said first high-tension circuit, said relay and said second high-tension circuit are connected in parallel between electrokinetic cell and the motor, and said current sensor is arranged between said first high-tension circuit, said relay and said second high-tension circuit sys node and the said motor, links to each other with said sequential control circuit;
Said electronic control unit is used for sending connection high-tension circuit signal or breaking off the high-tension circuit signal to said sequential control circuit;
Said first high-tension circuit is used to be switched on or switched off said electrokinetic cell and said motor;
Said relay is used to be switched on or switched off said electrokinetic cell and said motor;
Said second high-tension circuit is used to be switched on or switched off said electrokinetic cell and said motor;
Said current sensor is used to detect the electric current between said electrokinetic cell and the said motor;
Said sequential control circuit after being used to receive the connection high-tension circuit signal of said electronic control unit transmission, is controlled said first high-tension circuit and is connected; After said first high-tension circuit is connected,, connects the current changing rate that said current sensor senses arrives if, then controlling said relay less than threshold value; After said relay is connected,, breaks off the current changing rate that said current sensor senses arrives if, then controlling said first high-tension circuit less than threshold value; After receiving the disconnection high-tension circuit signal of said electronic control unit transmission, control second high-tension circuit and connect; After said second high-tension circuit is connected, control said relay and break off; If, then controlling said second high-tension circuit less than threshold value, breaks off the current changing rate that said current sensor senses arrives.
2. system according to claim 1, said first high-tension circuit comprises: first FET and adjusting resistance;
The grid of said first FET links to each other with said sequential control circuit, and drain electrode links to each other with an end of said adjusting resistance, and source electrode links to each other with said motor, and the other end of said adjusting resistance links to each other with said electrokinetic cell;
Said first FET is used to be switched on or switched off said first high-tension circuit;
Said adjusting resistance is used to limit the electric current of said first high-tension circuit.
3. system according to claim 1, said second high-tension circuit comprises: second FET and diode;
The grid of said second FET links to each other with said sequential control circuit, and drain electrode links to each other with said electrokinetic cell, and source electrode links to each other with said motor, and the positive pole of said diode links to each other with said motor, and negative pole links to each other with said electrokinetic cell;
Said second FET is used to be switched on or switched off said second high-tension circuit;
Said diode is used for after said second FET breaks off, arriving the electric current between said motor by said electrokinetic cell.
4. according to each described system of claim 1 to 3, it is characterized in that said sequential control circuit specifically is used for:
After receiving the connection high-tension circuit signal of said electronic control unit transmission, control said first FET and connect; After said first FET is connected,, connects the current changing rate that said current sensor senses arrives if, then controlling said relay less than threshold value; After said relay is connected,, breaks off the current changing rate that said current sensor senses arrives if, then controlling said first FET less than threshold value; After receiving the disconnection high-tension circuit signal of said electronic control unit transmission, control said second FET and connect; After said second FET is connected, control said relay and break off; If, then controlling said second FET less than threshold value, breaks off the current changing rate that said current sensor senses arrives.
5. system according to claim 1 is characterized in that, said system also comprises:
The optocoupler unit is connected between said electronic control unit and the said sequential control circuit, is used for insulating electron control unit and said sequence circuit.
6. system according to claim 2 is characterized in that, said first FET is MOSFET or IGBT.
7. system according to claim 3 is characterized in that, said second FET is MOSFET or IGBT.
8. system according to claim 1 is characterized in that, said relay is traditional high-current relay.
9. system according to claim 1 is characterized in that, said current sensor is the Hall-type current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202065755U CN202550470U (en) | 2012-05-09 | 2012-05-09 | System for safely switching on and off high-voltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202065755U CN202550470U (en) | 2012-05-09 | 2012-05-09 | System for safely switching on and off high-voltage circuit |
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| Publication Number | Publication Date |
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| CN202550470U true CN202550470U (en) | 2012-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202065755U Withdrawn - After Issue CN202550470U (en) | 2012-05-09 | 2012-05-09 | System for safely switching on and off high-voltage circuit |
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| Country | Link |
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| CN (1) | CN202550470U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684137A (en) * | 2012-05-09 | 2012-09-19 | 潍柴动力股份有限公司 | System and method for safely powering on/off high-voltage circuits |
| CN103158578A (en) * | 2012-09-21 | 2013-06-19 | 华晨汽车集团控股有限公司 | Automobile power battery high-voltage connection and control system |
-
2012
- 2012-05-09 CN CN2012202065755U patent/CN202550470U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684137A (en) * | 2012-05-09 | 2012-09-19 | 潍柴动力股份有限公司 | System and method for safely powering on/off high-voltage circuits |
| CN102684137B (en) * | 2012-05-09 | 2015-09-09 | 潍柴动力股份有限公司 | A kind of system and method realizing the safe power on/off of high-tension circuit |
| CN103158578A (en) * | 2012-09-21 | 2013-06-19 | 华晨汽车集团控股有限公司 | Automobile power battery high-voltage connection and control system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121121 Effective date of abandoning: 20150909 |
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| RGAV | Abandon patent right to avoid regrant |