CN114172124A - High-voltage distribution device with negative bus impact current suppression function - Google Patents
High-voltage distribution device with negative bus impact current suppression function Download PDFInfo
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- CN114172124A CN114172124A CN202111291315.2A CN202111291315A CN114172124A CN 114172124 A CN114172124 A CN 114172124A CN 202111291315 A CN202111291315 A CN 202111291315A CN 114172124 A CN114172124 A CN 114172124A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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Abstract
The invention discloses a high-voltage distribution device with a negative bus impact current suppression function. It includes power battery package, power battery high-voltage box, whole car high voltage distribution box, common mode inductance, main motor control circuit, main motor and the controller of driving, still includes negative pole generating line impact current suppression device, common mode inductance negative pole input end, other end ground connection are connected to negative pole generating line impact current suppression device's one end, and the control end connection director's of suppression circuit board control end, controller are used for controlling negative pole generating line impact current suppression device and discharge when control negative pole contactor is closed, and control negative pole generating line impact current suppression device suppresses EMI and disturbs after the completion of discharging. According to the invention, the current suppression of the negative bus is realized by using the negative bus impact current suppression device during high-voltage electrification, and the risk of adhesion of the negative bus impact current to the power battery negative contactor can be avoided.
Description
Technical Field
The invention belongs to the technical field of new energy automobile driving technology and high voltage safety, and particularly relates to a high voltage distribution device with a negative bus impact current suppression function.
Background
The high-voltage component of the new energy whole vehicle comprises a power battery, a high-voltage connecting cable and high-voltage electric equipment (such as a main drive motor system, a whole vehicle high-voltage distribution system, a DCDC conversion controller, an electric air compressor motor system, an electric steering motor system and the like). On one hand, the high-voltage components form a main working circuit according to the designed electrical principle so as to meet the power requirement of the whole vehicle; on the other hand, parasitic capacitance and inductance of the high-voltage components, common mode inductance and safety capacitance (X/Y capacitance) introduced for suppressing the EMI of the whole vehicle form a plurality of secondary loops through a vehicle frame, and instantaneous large pulse voltage/current is generated under certain working conditions, so that impact and damage are caused to components and parts such as contactors inside the high-voltage components.
The power battery is connected with a ground distribution capacitor, a power battery negative electrode contactor, a common mode inductor at the input side of a main drive motor bus, a Y capacitor, a high-voltage cable and a frame ground to form a loop, and at the moment that the negative electrode of the power battery is closed, the negative electrode bus can generate pulse current with thousands of amperes and microseconds duration, so that the power battery negative electrode contactor is damaged or fails.
Aiming at the coping strategy of the impact current of the negative bus on the high-voltage component when the negative contactor of the electric automobile is closed, 2 technical schemes are mainly adopted at present:
scheme 1: when the power battery high-voltage box negative contactor is selected, enough allowance is reserved, and the power battery high-voltage box negative contactor is designed according to 2-2.5 times of rated current.
Scheme 2: the safety capacitor plate of the main drive motor controller adopts an asymmetric design, namely the design values of the positive electrode and the negative electrode Y capacitors of the bus are different and generally have a difference of 1 order of magnitude, for example, the positive electrode bus Y capacitor adopts 0.3 muF, and the negative electrode bus Y capacitor adopts 10 nF.
The prior art scheme has the following disadvantages:
scheme 1: the negative contactor of the high-voltage box of the power battery is selected according to 2-2.5 times of rated working current, so that design waste is easily caused, and the design cost of a battery system is increased.
Scheme 2: the safety capacitor plate of the main drive motor controller adopts an asymmetric design, so that the EMC characteristic of a main drive motor system can be reduced, and the performance of the whole vehicle is further influenced.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a high-voltage distribution device with a function of inhibiting the impact current of a negative bus, so that the risk of adhesion of the impact current of the negative bus to a negative contactor of a power battery is avoided.
The technical scheme adopted by the invention is as follows: a high-voltage power distribution device with a negative bus impact current suppression function comprises a power battery pack, a power battery high-voltage box, a whole vehicle high-voltage distribution box, a common-mode inductor, a main drive motor control circuit, a main drive motor and a controller, wherein one end of the power battery high-voltage box is connected with a negative electrode of the power battery pack, the other end of the power battery high-voltage box is connected with a negative electrode input end of the common-mode inductor, one end of the whole vehicle high-voltage distribution box is connected with a positive electrode of the power battery pack, the other end of the whole vehicle high-voltage distribution box is connected with a positive electrode input end of the common-mode inductor, an output end of the common-mode inductor is connected with an input end of the main drive motor control circuit, an output end of the main drive motor control circuit is connected with the main drive motor, and a control end of the controller is respectively connected with control ends of the power battery high-voltage box, the whole vehicle high-voltage distribution box and the main drive motor control circuit,
the common-mode inductor negative-electrode input end is connected with the common-mode inductor, the other end of the common-mode inductor negative-electrode input end is connected with the ground, the control end of the suppression circuit board is connected with the control end of the controller, the controller is used for controlling the negative-electrode bus impact current suppression device to discharge when the negative-electrode contactor is controlled to be closed, and the negative-electrode bus impact current suppression device is controlled to suppress EMI interference after discharging is completed.
Furthermore, the negative bus impact current suppression device comprises a double-contact mutex contactor, an unloading resistor and a suppression capacitor, wherein a control end of the double-contact mutex contactor is connected with the controller, a fixed contact of the double-contact mutex contactor is connected with a negative output end of the common-mode inductor, a first movable contact of the double-contact mutex contactor is connected with one end of the unloading resistor, a second movable contact of the double-contact mutex contactor is connected with one end of the suppression capacitor, and the other end of the unloading resistor and the other end of the suppression capacitor are both grounded.
Further, after receiving the high-voltage power-on message, the controller controls the first movable contact of the double-contact mutual exclusion contactor to be closed first, then controls the negative contactor in the power battery high-voltage box to be closed, controls the first movable contact to be disconnected and controls the second movable contact to be closed after the negative contactor is closed for a set time, and finally controls the positive contactor in the whole vehicle high-voltage distribution box to be closed.
Further, the set time is 30-100 ms.
Further, the set time is 50 ms.
Further, the resistance value of the unloading resistor is 10-20 omega.
Furthermore, the heating power of the unloading resistor is 1-2W.
Further, the suppression capacitor is a parallel capacitor in the main drive motor control circuit.
Furthermore, the working current of the double-contact mutual exclusion contactor is 10-30A.
Furthermore, the working voltage of the double-contact mutual exclusion contactor is 20-50V.
The invention has the beneficial effects that:
1. according to the invention, the auxiliary loop negative bus impact current suppression device when the power battery negative contactor is closed is constructed by utilizing the improved design of the safety capacitor plate of the main drive motor controller, the existing high-voltage main loop design is not changed, the main loop design is not basically influenced, the auxiliary loop negative bus impact current when the negative contactor is closed can be suppressed by using lower design and manufacturing cost, and the reliability of the whole high-voltage loop design is further improved.
2. According to the invention, the current of the negative bus is inhibited when the contact A is closed and the main drive motor controller EMC circuit is not influenced when the contact B is closed and the normal work is realized, and the risk of adhesion of the impact current of the negative bus to the negative contactor of the power battery can be avoided.
3. The invention utilizes the specification selection of the discharging unloading resistor and the double-contact mutual exclusion contactor of the negative bus impact current suppression device, can adopt the double-contact contactor of the low-voltage loop to realize the impact current suppression of the high-voltage auxiliary loop, and can quickly and simply carry out the design selection of the discharging unloading resistor and the double-contact mutual exclusion contactor according to the specification selection principle of the discharging unloading resistor and the double-contact mutual exclusion contactor aiming at different vehicle high-voltage system designs, thereby reducing the design difficulty of the system.
Drawings
Fig. 1 is a schematic diagram of a high voltage power distribution apparatus of the present invention.
Fig. 2 is an equivalent circuit diagram of a conventional high-voltage power distribution apparatus not equipped with a negative bus inrush current suppression device.
Fig. 3 is an equivalent circuit diagram of the negative bus bar inrush current suppression function according to the present invention.
Fig. 4 is an equivalent circuit diagram after the negative bus bar inrush current suppression function is realized according to the present invention.
Fig. 5 is a flowchart of the present invention when the negative bus bar inrush current suppression function is implemented.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.
It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.
Further, in constituting the component, although it is not explicitly described, it is understood that a certain error region is necessarily included.
In describing positional relationships, for example, when positional sequences are described as being "on.. above", "over.. below", "below", and "next", unless such words or terms are used as "exactly" or "directly", they may include cases where there is no contact or contact therebetween. If a first element is referred to as being "on" a second element, that does not mean that the first element must be above the second element in the figures. The upper and lower portions of the member will change depending on the angle of view and the change in orientation. Thus, in the drawings or in actual construction, if a first element is referred to as being "on" a second element, it can be said that the first element is "under" the second element and the first element is "over" the second element. In describing temporal relationships, unless "exactly" or "directly" is used, the description of "after", "subsequently", and "before" may include instances where there is no discontinuity between steps.
The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship.
The new energy vehicle high-voltage distribution adopts a power battery high-voltage box and a whole vehicle high-voltage distribution control module (PDU) to jointly realize: usually, a contactor of a negative electrode of a direct current bus is placed in a power battery high-voltage box, and the on-off of the contactor is controlled by a power battery management system BMS; the positive contactor of the high-voltage load power supply loop is placed in a whole vehicle high-voltage distribution control module (PDU), and the on-off of the positive contactor is controlled by the PDU. When the system is powered on at high voltage, the BMS controls the battery accessory contactor to be closed first, and then the BMS switches on or switches off the positive contactors of all loops according to instructions sent by the vehicle control unit HCU according to the PDU.
On one hand, the main drive motor and the controller thereof can generate stronger conduction radiation on a power supply loop due to the working principle of the main drive motor and the controller thereof, and are main electromagnetic radiation disturbance sources on the new energy whole vehicle. Common mode inductance and Y capacitance are usually connected to the input side of a bus of a main drive motor controller, so that the inductive reactance of a main loop is increased, the impedance to the ground is reduced, and the effect of suppressing EMI interference is achieved.
On the other hand, due to the existence of the battery ground distributed capacitance, at the moment when the BMS controls the battery negative electrode contactor to be closed, a battery ground distributed capacitance (several microfarads) is formed to be used as a power supply, a high-voltage cable resistor and a bus negative electrode Y capacitor in the main drive electric control controller are used as a charge-discharge loop of a load; meanwhile, because the resistance of the high-voltage cable is very small, a differential mode inductor generally introduced into a common mode inductor of the main drive controller and the Y capacitor form an approximate LC oscillating circuit. Therefore, when the negative contactor is closed, a high-frequency impact current with the amplitude of thousands of amperes and the duration of microseconds is generated on the negative bus, and the frequency of the impact current is the resonance frequency of the LC oscillating circuit.
The invention provides a high-voltage distribution device with a negative bus impact current suppression function, which adopts the following technical scheme: by improving the design of a safety capacitor plate of a main drive motor controller, a double-contact mutual exclusion relay and a ground resistor controlled by software are added on the safety capacitor plate of the main drive motor controller. When the negative contactor in the power battery high-voltage box is closed, the double-contact mutual exclusion contactor is controlled to be closed at the point A through software, the added ground resistance is accessed, and the negative bus impact current in the closing process of the negative contactor is inhibited; when the closing action of the negative contactor is completed, the double-contact mutual exclusion contactor is controlled to be closed at the point B through software, the accessed ground resistor is bypassed, and the value is accessed to the negative bus Y capacitor, so that the bus negative ground impedance is reduced when the main drive system normally works, and the influence on the EMC characteristic of the main drive motor loop is avoided.
As shown in fig. 1, a high voltage distribution device with a negative bus impact current suppression function comprises a power battery pack, a power battery high voltage box, a whole vehicle high voltage distribution box, a common mode inductor, a main drive motor control circuit, a main drive motor and a controller (not shown in the figure), wherein one end of the power battery high voltage box is connected with a negative electrode of the power battery pack, the other end of the power battery high voltage distribution box is connected with a negative electrode input end of the common mode inductor, one end of the whole vehicle high voltage distribution box is connected with a positive electrode of the power battery pack, the other end of the whole vehicle high voltage distribution box is connected with a positive electrode input end of the common mode inductor, an output end of the common mode inductor is connected with an input end of the main drive motor control circuit, an output end of the main drive motor control circuit is connected with the main drive motor, and a control end of the controller is respectively connected with the power battery high voltage box, the whole vehicle high voltage distribution box and a control end of the main drive motor control circuit,
the common-mode inductor negative-electrode input end is connected with the common-mode inductor, the other end of the common-mode inductor negative-electrode input end is connected with the ground, the control end of the suppression circuit board is connected with the control end of the controller, the controller is used for controlling the negative-electrode bus impact current suppression device to discharge when the negative-electrode contactor is controlled to be closed, and the negative-electrode bus impact current suppression device is controlled to suppress EMI interference after discharging is completed.
In the above scheme, the negative bus inrush current suppression device includes a dual-contact mutex contactor, an unloading resistor and a suppression capacitor, a control end of the dual-contact mutex contactor is connected to the controller, a fixed contact of the dual-contact mutex contactor is connected to a negative output end of the common mode inductor, a first movable contact (i.e., point a) of the dual-contact mutex contactor is connected to one end of the unloading resistor, a second movable contact (i.e., point B) of the dual-contact mutex contactor is connected to one end of the suppression capacitor, and the other end of the unloading resistor and the other end of the suppression capacitor are both grounded. When the impact current is suppressed, after the controller receives a high-voltage electrifying message, the controller controls the first movable contact of the double-contact mutual exclusion contactor to be closed firstly, then controls the negative contactor in the power battery high-voltage box to be closed, controls the first movable contact to be opened and the second movable contact to be closed after the negative contactor is closed for a set time, and finally controls the positive contactor in the whole vehicle high-voltage distribution box to be closed. The set time is 30-100 ms, preferably 50 ms.
When the whole vehicle is electrified at high voltage, the negative contactor in the power battery high-voltage box is firstly closed, in the closing process, if a negative bus impact current suppression device is not adopted, a secondary circuit is formed between the power battery and an EMC suppression circuit of a main drive motor controller, and the equivalent circuit of the secondary circuit is shown in figure 2: 201 is distributed capacitance C of power battery to groundBatteryAnd 202 is the insulation resistance R of the negative pole of the power battery to the ground ins-203 is power battery negative pole contactor K 1204 is a bus negative differential mode inductor L introduced by a common mode inductor at the bus input side of the main drive motor controller when the power battery negative contactor is closed1And 205 is the negative pole Y capacitor C of the main drive motor controllerYAnd 206 is a frame ground. Power battery ground distributed capacitor CBatteryBecause the voltage is higher than the negative pole Y capacitor C of the main drive motor controllerYThe former will charge the latter due to the small loop impedance and the differential mode input inductance L1The current is caused to resonate, and a rush current causing thousands of amperes is generated on the negative bus.
The invention adopts a negative bus impact current suppression device, and when the whole vehicle is electrified at high voltage, the negative electrode in the power battery high-voltage box is contactedBefore the device is closed, the double-contact contactor in the negative bus impact current suppression device is controlled to be closed at the point A by the controller. When a negative contactor in a high-voltage box of the power battery is closed in an attraction mode, charges of a negative electrode ground-distributed capacitor of the power battery are discharged through serially connected ground resistors, and discharging current depends on the voltage U of the power battery endBatteryAnd a series-connected earth unloading resistor Rdischarge. The equivalent circuit at this time is shown in fig. 3: 207 double-contact mutual exclusion contactor K2And 208 is a series-connected unloading resistor RdischargeAnd 209 is a suppression capacitor, namely a negative electrode Y capacitor C of the main drive motor controllerY. The unloading resistor R is closed at the contact A through the double-contact mutual exclusion contactordischargeAnd the main drive controller is connected in a loop in series to bypass a negative electrode Y capacitor of the main drive controller, so that the effect of inhibiting the impact current of a negative electrode bus is achieved. At this time, the negative bus current Ibus-satisfies:
Ibus-≤UBattery/Rdischarge/2
when the negative contactor of the high-voltage box of the power battery is closed, the negative bus of the power battery discharges to the ground distributed capacitor, the controller controls the double-contact mutual exclusion contactor in the negative bus impact current suppression device to be closed at the point B, the negative Y capacitor of the bus is connected into a loop in series, and the discharging unloading resistor is bypassed, so that the effect of suppressing the EMI interference of the conduction current is achieved. The equivalent circuit at this time is shown in fig. 4.
Regarding the specification selection of the unloading resistor, two considerations of discharging unloading time and discharging current are considered: the discharge unloading time is too long (generally not more than 50ms), which can affect the high-voltage power-on time of the whole vehicle, so the unloading resistance is not suitable to be too large; the discharge current is too large, which affects the specification and model selection of the double-contact mutual exclusion contactor, thereby increasing the cost of the negative bus impact current suppression device. As the voltage range of the power battery is 400-720 VDC, the power supply of the power battery negative electrode to ground distributed capacitor is within the range of 200-360 VDC, and the resistance value of the unloading resistor Rdischarge can be selected from 10-20 omega. Meanwhile, the discharging energy consumes a certain amount of heat on the resistor, so that the unloading resistor Rdischarge has a certain heating power, and the heating power of the unloading resistor Rdischarge can be selected from 1-2W because the discharging time is relatively short. In combination of the above two points, the unloading resistance Rdischarge can be selected to be 20 Ω/1W or 10 Ω/2W.
Regarding the selection of the double-contact mutual exclusion contactor, although the auxiliary loop is also a high-voltage loop, the double-contact mutual exclusion contactor can not bear high voltage and large current no matter the contact A is closed or the contact B is closed, so that a low-voltage contactor system can be used for replacing the double-contact mutual exclusion contactor, and the specification is selected to be 20A/24V.
In the working process of the negative bus bar inrush current suppression device, the motion of the contact is controlled by the controller, and the control flow chart is shown in fig. 5.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
The foregoing description of the embodiments and specific examples of the invention have been presented for purposes of illustration and description; it is not intended to be the only form in which the embodiments of the invention may be practiced or utilized. The embodiments are intended to cover the features of the various embodiments as well as the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and step sequences.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
Those of skill in the art will further appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The various illustrative logical blocks, or elements, described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides a high voltage distribution device with negative pole generating line impulse current suppression function, includes power battery package, power battery high-voltage box, whole car high voltage distribution box, common mode inductance, main drive motor control circuit, main drive motor and controller, power battery package negative pole, the common mode inductance negative pole input is connected to the other end are connected to power battery high-voltage box one end, it is anodal that power battery package is connected to whole car high voltage distribution box one end, the anodal input of common mode inductance is connected to the other end, the input of main drive motor control circuit is connected to the output of common mode inductance, main drive motor is connected to the output of main drive motor control circuit, power battery high-voltage box, whole car high voltage distribution box and the main control end that drives motor control circuit are connected respectively to the controller control end, its characterized in that:
the common-mode inductor negative-electrode input end is connected with the common-mode inductor, the other end of the common-mode inductor negative-electrode input end is connected with the ground, the control end of the suppression circuit board is connected with the control end of the controller, the controller is used for controlling the negative-electrode bus impact current suppression device to discharge when the negative-electrode contactor is controlled to be closed, and the negative-electrode bus impact current suppression device is controlled to suppress EMI interference after discharging is completed.
2. A high-voltage power distribution apparatus having a negative bus bar rush current suppression function according to claim 1, characterized in that: the negative bus impact current suppression device comprises a double-contact mutual exclusion contactor, an unloading resistor and a suppression capacitor, wherein a control end of the double-contact mutual exclusion contactor is connected with a controller, a fixed contact of the double-contact mutual exclusion contactor is connected with a negative output end of a common mode inductor, a first movable contact of the double-contact mutual exclusion contactor is connected with one end of the unloading resistor, a second movable contact of the double-contact mutual exclusion contactor is connected with one end of the suppression capacitor, and the other end of the unloading resistor and the other end of the suppression capacitor are both grounded.
3. A high-voltage power distribution apparatus having a negative bus bar rush current suppression function according to claim 2, characterized in that: after receiving the high-voltage power-on message, the controller controls the first movable contact of the double-contact mutual exclusion contactor to be closed firstly, then controls the negative contactor in the power battery high-voltage box to be closed, controls the first movable contact to be disconnected and controls the second movable contact to be closed after the negative contactor is closed for a set time, and finally controls the positive contactor in the whole vehicle high-voltage distribution box to be closed.
4. A high-voltage power distribution apparatus having a negative bus bar rush current suppressing function according to claim 3, characterized in that: the set time is 30-100 ms.
5. The high-voltage power distribution apparatus having a negative bus bar inrush current suppression function according to claim 4, characterized in that: the set time is 50 ms.
6. A high-voltage power distribution apparatus having a negative bus bar rush current suppression function according to claim 2, characterized in that: the resistance value of the unloading resistor is 10-20 omega.
7. A high-voltage power distribution apparatus having a negative bus bar rush current suppression function according to claim 2, characterized in that: the heating power of the unloading resistor is 1-2W.
8. A high-voltage power distribution apparatus having a negative bus bar rush current suppression function according to claim 2, characterized in that: the suppression capacitor is a parallel capacitor in the main drive motor control circuit.
9. A high-voltage power distribution apparatus having a negative bus bar rush current suppression function according to claim 2, characterized in that: the working current of the double-contact mutual exclusion contactor is 10-30A.
10. A high-voltage power distribution apparatus having a negative bus bar rush current suppression function according to claim 2, characterized in that: the working voltage of the double-contact mutual exclusion contactor is 20-50V.
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| JP2002191102A (en) * | 2000-12-20 | 2002-07-05 | Toshiba Corp | Power supply device for vehicle and controlling device thereof |
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| CN114172124B (en) | 2024-04-05 |
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