CN204046483U - Used in new energy vehicles power drive system - Google Patents
Used in new energy vehicles power drive system Download PDFInfo
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- CN204046483U CN204046483U CN201420352489.4U CN201420352489U CN204046483U CN 204046483 U CN204046483 U CN 204046483U CN 201420352489 U CN201420352489 U CN 201420352489U CN 204046483 U CN204046483 U CN 204046483U
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Abstract
The utility model discloses a kind of used in new energy vehicles power drive system, comprise high voltage power battery, DC support electric capacity, the first Y capacitance, the second Y capacitance, electric machine controller, three phase alternating current motor, the first electric capacity protective device, the second electric capacity protective device; DC support electric capacity, is connected in parallel on high voltage power anode and negative pole two ends; Electric machine controller, two inputs are connected in parallel on DC support electric capacity two ends, and three outputs connect the three-phase input line of three phase alternating current motor respectively; Three phase alternating current motor, shell is directly overlapped in vehicle body on the ground; First Y capacitance and the first electric capacity protective device are connected in series between high voltage power anode and vehicle body ground; Second Y capacitance and the second electric capacity protective device are connected in series between high voltage power battery cathode and vehicle body ground.Used in new energy vehicles power drive system of the present utility model, when motor phase winding is to shell short circuit or failure of insulation, can protects the Y capacitance in power drive system, and can not affect the filter effect of Y capacitance.
Description
Technical field
The utility model belongs to technical field of new energy, is specifically related to a kind of used in new energy vehicles power drive system.
Background technology
Safety electric capacity refers to for such occasion, namely after capacitor failure, can not cause electric shock, not jeopardize personal safety.
According to IEC 60384-14, safety electric capacity is divided into X electric capacity and Y capacitance two type, and X electric capacity is connected across the electric capacity between power line two line (L-N), generally selects metal thin film capacitor; Y capacitance is the electric capacity being connected across (L-E, N-E) between power line two line and ground respectively, is generally paired appearance.Based on the restriction of leakage current, Y capacitance value can not be too large, and general X electric capacity is uF level, and Y capacitance is nF level.X electric capacity and Y capacitance are used in power-supply filter, play power filter effect, and respectively to common mode (Y capacitance), differential mode (X electric capacity) interference strobes, and X electric capacity suppresses differential mode interference, and Y capacitance suppresses common mode disturbances.
Current new-energy automobile (EV & HEV, pure electric automobile and hybrid-electric car), most employing high-tension electricity drive system (>60V), often need to adopt Y capacitance in the high-tension electricity source of this type systematic, to strobe to common mode disturbances, thus whole system electromagnetic compatibility (EMC) is also made to improve.
Existing used in new energy vehicles high-tension electricity drive system, primarily of compositions such as high voltage power battery, electric machine controller (inverter), motors, a DC support electric capacity and two Y capacitance are had at high voltage power battery two ends, DC support electric capacity is directly connected across between high voltage power anode and negative pole, and two Y capacitance are connected across high voltage power anode and vehicle body ground and between high voltage power battery cathode and vehicle body ground respectively.But above-mentioned high-tension electricity drive system there occurs following fault in actual applications: during motor runs, electric machine controller is in normal mode of operation, now there is a phase (U or V or W phase) shorted to earth suddenly in motor three-phase (UVW three-phase), due in motor operation, upper system or electric machine controller can not detect motor relative ground circuit fault, motor can not be allowed to quit work, thus cause in Y capacitance and flow through abnormal big current, heating seriously finally causes Y capacitance Damage by Short Circuit.
In summary, there are the following problems for existing used in new energy vehicles high-tension electricity drive system: 1). the relative vehicle body ground of diagnosing motor or failure of insulation fault cannot be come by upper system or electric machine controller itself when high-tension electricity drive system works; 2). when the relative vehicle body ground of motor or failure of insulation fault occur, there is no effective Y capacitance safeguard measure, finally cause Y capacitance Damage by Short Circuit.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of used in new energy vehicles power drive system; can when a certain phase winding of three phase alternating current motor be to the short circuit of three phase alternating current motor shell or failure of insulation; Y capacitance in power drive system is protected, and the filter effect of Y capacitance can not be affected.
For solving the problems of the technologies described above, the used in new energy vehicles power drive system that the utility model provides, comprises high voltage power battery, DC support electric capacity, the first Y capacitance, the second Y capacitance, electric machine controller, three phase alternating current motor, the first electric capacity protective device, the second electric capacity protective device; Described DC support electric capacity, is connected in parallel on high voltage power anode and negative pole two ends; Described electric machine controller, two inputs are connected in parallel on described DC support electric capacity two ends, and three outputs connect the three-phase input line of three phase alternating current motor respectively; Described three phase alternating current motor, shell is directly overlapped in vehicle body and is indirectly overlapped in vehicle body on the ground on the ground or by intermediate medium;
Described first Y capacitance and the first electric capacity protective device are connected in series formation one group, are connected across between high voltage power anode and vehicle body ground;
Described second Y capacitance and the second electric capacity protective device are connected in series formation one group, are connected across between high voltage power battery cathode and vehicle body ground.
Preferably, described first electric capacity protective device, the second electric capacity protective device are semistor;
Described semistor, when temperature is lower than certain value, its resistance value is little and change is very little, and after temperature is elevated to certain value, its resistance value increases rapidly.
Preferably, described Y capacitance protective device is circuit breaker;
Described circuit breaker, when the electric current flowed through is less than or equal to set point, is in normal closure state; When the electric current flowed through is greater than set point, automatically disconnect.
Preferably, described circuit breaker, returns to normal closure state by manual or Electronic control.
Preferably, used in new energy vehicles power drive system, also comprises upper system;
Described upper system, when electricity under used in new energy vehicles power drive system or when powering on, whether certain the phase winding detecting three phase alternating current motor exists the short circuit of three phase alternating current motor shell or failure of insulation fault, if existed, then quote corresponding failure, control used in new energy vehicles power drive system and quit work.
Used in new energy vehicles power drive system of the present utility model, Y capacitance and electric capacity protective device are connected in series between high voltage power anode (or negative pole) and vehicle body ground, and electric capacity protective device can suppress the electric current flowing through Y capacitance, avoids Y capacitance to burn out.This power drive system, after a certain phase winding of generation three phase alternating current motor is to the short circuit of three phase alternating current motor shell or failure of insulation fault, although can not be detected in running, but when electricity under power drive system or when powering on, upper system (such as battery management system BMS) can diagnose this fault by Insulation monitoring, thus order power drive system quits work, and localizing faults classification.Used in new energy vehicles power drive system of the present utility model; by electric capacity protective device in the course of work; lower electricity or when powering on by the Insulation monitoring of upper system; be formed in and a certain phase winding of three phase alternating current motor occur to the complete preservation to Y capacitance when the short circuit of three phase alternating current motor shell or failure of insulation fault; the destructiveness of described fault can be reduced on the one hand; on the other hand can also such fault of effective location, and the filter effect of Y capacitance can not be affected.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical solution of the utility model, below the accompanying drawing used required for the utility model is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that used in new energy vehicles electric drive trains of the present utility model unifies embodiment circuit diagram;
Fig. 2 is the current circuit schematic diagram that used in new energy vehicles electric drive trains of the present utility model unifies embodiment;
Fig. 3 is the current circuit schematic diagram of another embodiment of used in new energy vehicles power drive system of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, carry out clear, complete description to the technical scheme in the utility model, obviously, described embodiment is a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope of the utility model protection.
Embodiment one
Used in new energy vehicles power drive system, as shown in Figure 1, comprise high voltage power battery 1, DC support electric capacity 6, first Y capacitance 4, second Y capacitance 10, first electric capacity protective device 3, second electric capacity protective device 11, electric machine controller (inverter) 7, three phase alternating current motor 8;
Described DC support electric capacity 6, is connected in parallel on high voltage power battery 1 positive pole and negative pole two ends;
Described electric machine controller 7, two input is connected in parallel on DC support electric capacity 6 two ends, and three output UVW connect the three-phase input line of three phase alternating current motor 8 respectively;
Described three phase alternating current motor 8, shell 802 is directly overlapped in vehicle body and is indirectly overlapped in vehicle body on the ground on the ground or by other intermediate medium;
Described first Y capacitance 4 and the first electric capacity protective device 3 are connected in series formation one group, are connected across between high voltage power battery 1 positive pole and vehicle body ground;
Described second Y capacitance 10 and the second electric capacity protective device 11 are connected in series formation one group, are connected across between high voltage power battery 1 negative pole and vehicle body ground.
Preferably, described electric machine controller 7, comprises 6 insulated gate bipolar transistors (IGBT) S1, S2 ..., S6.
Preferably, used in new energy vehicles power drive system, also comprises upper system (such as battery management system BMS); Described upper system, when electricity under used in new energy vehicles power drive system or when powering on, detect three phase alternating current motor phase winding and whether exist the short circuit of three phase alternating current motor shell or failure of insulation fault, if existed, then quote corresponding failure, control used in new energy vehicles power drive system and quit work.
The used in new energy vehicles power drive system of embodiment one, two Y capacitance are connected across between high voltage power battery 1 positive/negative and vehicle body ground respectively, therefore one end of two Y capacitance and three phase alternating current motor 8 shell 802 finally receive vehicle body on the ground all jointly, and actual is linked together one end of two Y capacitance and be jointly connected with three phase alternating current motor 8 shell 802.When power drive system is in operational mode, three phase alternating current motor runs, when a certain phase winding 801 pairs of three phase alternating current motor shells short circuit of three phase alternating current motor or failure of insulation, if upper system and electric machine controller do not carry out Insulation monitoring in power drive system work, fail to detect this kind of fault, electric machine controller still performs (6 IGBT normallies and shutoff) according to normal work order, now produce alternating current in circuit via electric machine casing, enter into Y capacitance vehicle body, if there is no electric capacity protective device, there will be and cause generating heat and impaired phenomenon owing to flowing through big current in Y capacitance.
The used in new energy vehicles power drive system of embodiment one, Y capacitance and electric capacity protective device are connected in series between high voltage power anode (or negative pole) and vehicle body ground, and electric capacity protective device can suppress the electric current flowing through Y capacitance, avoids Y capacitance to burn out.This power drive system, after a certain phase winding of generation three phase alternating current motor is to the short circuit of three phase alternating current motor shell or failure of insulation fault, although can not be detected in running, but when electricity under power drive system or when powering on, upper system (such as battery management system BMS) can diagnose this fault by Insulation monitoring, thus order power drive system quits work, and localizing faults classification.The used in new energy vehicles power drive system of embodiment one; by electric capacity protective device in the course of work; lower electricity or when powering on by the Insulation monitoring of upper system; be formed in and a certain phase winding of three phase alternating current motor occur to the complete preservation to Y capacitance when the short circuit of three phase alternating current motor shell or failure of insulation fault; the destructiveness of described fault can be reduced on the one hand; on the other hand can also such fault of effective location, and the filter effect of Y capacitance can not be affected.
Embodiment two
Based on the used in new energy vehicles power drive system of embodiment one, as shown in Figure 2, described first electric capacity protective device 3, second electric capacity protective device 11 is resistors that semistor (PTC) etc. has variable resistance value character;
Described semistor, when temperature is lower than certain value, its resistance value is little and change is very little, and after temperature is elevated to certain value, its resistance value increases rapidly.
For motor W phase winding shorted to earth, under power drive system is in operational mode, when W relative three phase alternating current motor shell 802 short circuit in three phase alternating current motor three-phase winding 801 or failure of insulation, because upper system (such as battery management system) and electric machine controller 7 all fail to detect this fault, therefore 6 insulated gate bipolar transistor (IGBT) turn-on and turn-off of electric machine controller 7 still perform according to normal work order, such as execution work instruction makes S1, S4, S5 conducting, S2, S3, S6 turns off, now corresponding current circuit just like being with shown in arrow line in Fig. 2, in like manner can obtain 6 IGBT perform other conducting turn off instruction time current circuit, do not repeat them here.With the current circuit in Fig. 2, via S1 → U phase line → W phase line → electric machine casing 802 → vehicle body ground → second Y capacitance 10 → the second semistor 11 → high voltage power battery 1 negative pole by high voltage power battery 1 positive pole, why electric current can flow through the second Y capacitance 10 herein, mainly because the conducting of 6 IGBT turns off in control loop produce alternating current, meet electric capacity and lead to the operating characteristic exchanging stopping direct current.Suppose semistor 3, the critical abrupt temp of 11 resistance value sudden changes is T1, initial time, the temperature of described second semistor 11 is less than T1, show the characteristic that resistance value is very little, larger current is had to flow through in described current circuit, second Y capacitance 10 and the second semistor 11 heating up, after running a period of time, when the temperature of the second semistor 11 is more than or equal to T1, the resistance value of the second semistor 11 significantly raises rapidly, reduce the electric current in described current circuit conversely, iterative cycles like this, ensure that the temperature of the second Y capacitance 10 on loop maintains below critical damage temperature T2 all the time, described critical damage temperature T2 refers to once the temperature of the second Y capacitance 10 is elevated to T2, second Y capacitance 10 just has impaired risk.Described critical abrupt temp T1 needs to select in conjunction with the critical damage temperature T2 of the second Y capacitance 10 and practical situations.
Embodiment three
Based on the used in new energy vehicles power drive system of embodiment one, as shown in Figure 3, described first electric capacity protective device 3, second electric capacity protective device 11 is switching components that circuit breaker etc. has overcurrent break function; Described circuit breaker, when the electric current flowed through is less than or equal to set point, is in normal closure state; When the electric current flowed through is greater than set point, automatically disconnect; Described circuit breaker, returns to normal normal closure state again by manual or Electronic control, again returns to normal normal closure state.
The power drive system of used in new energy vehicles shown in Fig. 3, described first circuit breaker 3 and the first Y capacitance 4 are connected in series formation one group, are connected across between high voltage power battery 1 positive pole and vehicle body ground; Second circuit breaker 11 and the second Y capacitance 10 are connected in series and form another group, are connected across between high voltage power battery 1 negative pole and vehicle body ground.For motor W phase winding shorted to earth, under power drive system is in operational mode, when W relative three phase alternating current motor shell 802 short circuit in three phase alternating current motor three-phase winding 801 or failure of insulation, described current circuit by high voltage power battery 1 positive pole via S1 → U phase line → W phase line → electric machine casing 802 → vehicle body ground → second Y capacitance 10 → the second circuit breaker 11 → high voltage power battery 1 negative pole.Suppose circuit breaker 3; the critical turn-off current threshold value of 11 is I; once motor a certain phase winding shorted to earth fault or failure of insulation; the electric current flowing through the second circuit breaker 11 exceeds threshold value I; second circuit breaker 11 disconnects; no longer formed and flow through the current circuit of the second Y capacitance 10, thus available protecting the second Y capacitance 10.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the utility model protects.
Claims (5)
1. a used in new energy vehicles power drive system, comprises high voltage power battery, DC support electric capacity, the first Y capacitance, the second Y capacitance, electric machine controller, three phase alternating current motor; Described DC support electric capacity, is connected in parallel on high voltage power anode and negative pole two ends; Described electric machine controller, two inputs are connected in parallel on described DC support electric capacity two ends, and three outputs connect the three-phase input line of three phase alternating current motor respectively; Described three phase alternating current motor, shell is directly overlapped in vehicle body and is indirectly overlapped in vehicle body on the ground on the ground or by intermediate medium; It is characterized in that, used in new energy vehicles power drive system also comprises the first electric capacity protective device, the second electric capacity protective device;
Described first Y capacitance and the first electric capacity protective device are connected in series formation one group, are connected across between high voltage power anode and vehicle body ground;
Described second Y capacitance and the second electric capacity protective device are connected in series formation one group, are connected across between high voltage power battery cathode and vehicle body ground.
2. used in new energy vehicles power drive system according to claim 1, is characterized in that,
Described first electric capacity protective device, the second electric capacity protective device are semistor;
Described semistor, when temperature is lower than certain value, its resistance value is little and change is very little, and after temperature is elevated to certain value, its resistance value increases rapidly.
3. used in new energy vehicles power drive system according to claim 1, is characterized in that,
Described Y capacitance protective device is circuit breaker;
Described circuit breaker, when the electric current flowed through is less than or equal to set point, is in normal closure state; When the electric current flowed through is greater than set point, automatically disconnect.
4. used in new energy vehicles power drive system according to claim 3, is characterized in that,
Described circuit breaker, returns to normal closure state by manual or Electronic control.
5. the used in new energy vehicles power drive system according to any one of claim 1 to 4, is characterized in that,
Used in new energy vehicles power drive system, also comprises upper system;
Described upper system, when electricity under used in new energy vehicles power drive system or when powering on, whether certain the phase winding detecting three phase alternating current motor exists the short circuit of three phase alternating current motor shell or failure of insulation fault, if existed, then quote corresponding failure, control used in new energy vehicles power drive system and quit work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420352489.4U CN204046483U (en) | 2014-06-27 | 2014-06-27 | Used in new energy vehicles power drive system |
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| CN201420352489.4U CN204046483U (en) | 2014-06-27 | 2014-06-27 | Used in new energy vehicles power drive system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113263A (en) * | 2014-06-27 | 2014-10-22 | 联合汽车电子有限公司 | Electric drive system for new energy vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113263A (en) * | 2014-06-27 | 2014-10-22 | 联合汽车电子有限公司 | Electric drive system for new energy vehicle |
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