CN114172124B - High-voltage distribution device with negative bus impact current inhibition function - Google Patents
High-voltage distribution device with negative bus impact current inhibition function Download PDFInfo
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- CN114172124B CN114172124B CN202111291315.2A CN202111291315A CN114172124B CN 114172124 B CN114172124 B CN 114172124B CN 202111291315 A CN202111291315 A CN 202111291315A CN 114172124 B CN114172124 B CN 114172124B
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Classifications
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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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- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a high-voltage distribution device with a negative bus impact current suppression function. The device 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, and further comprises a negative bus impact current suppression device, wherein one end of the negative bus impact current suppression device is connected with a negative input end of the common-mode inductor, the other end of the negative bus impact current suppression device is grounded, a control end of a suppression circuit board is connected with a control end of the controller, the controller is used for controlling the negative bus impact current suppression device to discharge when a negative contactor is controlled to be closed, and controlling the negative bus impact current suppression device to suppress EMI after the discharge is completed. The invention utilizes the negative bus impact current suppression device to suppress the negative bus current when the high voltage is applied, and can avoid the risk of adhesion of the negative bus impact current to the power battery negative contactor.
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 power distribution device with a negative bus impact current inhibition function.
Background
The high-voltage components of the whole new energy vehicle comprise a power battery, a high-voltage connecting cable and high-voltage electric equipment (such as a main drive motor system, a high-voltage power distribution system of the whole new energy vehicle, 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 loop according to the designed electric 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 capacitor (X/Y capacitor) for inhibiting the EMI of the whole vehicle form a plurality of auxiliary loops through the frame, and instantaneous large pulse voltage/current is generated under certain working conditions, so that impact and damage are caused to components inside the high-voltage components, such as contactors.
The power battery is grounded, a capacitor is distributed, a power battery cathode contactor, a common mode inductor and a Y capacitor are arranged on the input side of a bus of a main drive motor, a high-voltage cable and a circuit formed by a frame ground are arranged, and when the power battery cathode is closed, a pulse current with thousands of amperes and duration time microseconds is generated by the cathode bus, so that the power battery cathode contactor is damaged or fails.
Aiming at the countermeasure policy of the impact current of the negative bus to the high-voltage component when the negative contactor of the electric automobile is closed, at present, 2 main technical schemes are provided:
scheme 1: when the type of the power battery high-voltage box negative electrode contactor is selected, enough margin is reserved, and the power battery high-voltage box negative electrode 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 differ by 1 order of magnitude, for example, the positive electrode Y capacitor adopts 0.3 mu F, and the negative electrode Y capacitor adopts 10nF.
The prior art scheme has the following disadvantages:
scheme 1: the negative electrode contactor of the high-voltage box of the power battery is selected according to 2-2.5 times of rated working current, so that the design waste is easy to cause, and the design cost of a battery system is increased.
Scheme 2: the safety capacitor plates of the main drive motor controller are in asymmetric design, so that EMC characteristics of a main drive motor system can be reduced, and further the achievement of the characteristics of the whole vehicle is affected.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provide a high-voltage distribution device with a negative bus impact current inhibition function, so that the risk of adhesion of the negative bus impact current to a power battery negative contactor is avoided.
The technical scheme adopted by the invention is as follows: the high-voltage distribution device with the negative bus impact current inhibition 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 driving motor control circuit, a main driving motor and a controller, wherein one end of the power battery high-voltage box is connected with the negative electrode of the power battery pack, the other end of the power battery high-voltage box is connected with the negative input end of the common-mode inductor, one end of the whole vehicle high-voltage distribution box is connected with the positive electrode of the power battery pack, the other end of the whole vehicle high-voltage distribution box is connected with the positive input end of the common-mode inductor, the output end of the common-mode inductor is connected with the input end of the main driving motor control circuit, the output end of the main driving motor control circuit is connected with the control ends of the power battery high-voltage box, the whole vehicle high-voltage distribution box and the main driving motor control circuit respectively,
the negative bus impact current suppression device is characterized by further comprising a negative bus impact current suppression device, one end of the negative bus impact current suppression device is connected with a negative input end of the common-mode inductor, the other end of the negative bus impact current suppression device is grounded, a control end of the suppression circuit board is connected with a control end of the controller, and the controller is used for controlling the negative bus impact current suppression device to discharge when the negative contactor is controlled to be closed, and controlling the negative bus impact current suppression device to suppress EMI after the discharge is completed.
Further, 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 inductance, 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 grounded.
Further, after receiving a high-voltage power-on message, the controller controls to firstly control the first movable contact of the double-contact mutual exclusion contactor to be closed, then controls the negative electrode contactor in the power battery high-voltage box to be closed, after the negative electrode contactor is closed for a set time, controls the first movable contact to be opened, the second movable contact to be closed, and finally controls the positive electrode contactor in the whole vehicle high-voltage distribution box to be closed.
Further, the set time is 30 to 100ms.
Further, the set time is 50ms.
Further, the resistance value of the unloading resistor is 10-20Ω.
Further, the heat generation power of the unloading resistor is 1-2W.
Further, the suppression capacitor is a parallel capacitor in the control circuit of the main drive motor.
Further, the working current of the double-contact mutual exclusion contactor is 10-30A.
Further, the working voltage of the double-contact mutual exclusion contactor is 20-50V.
The beneficial effects of the invention are as follows:
1. the invention utilizes the improved design of the safety capacitor plate of the main drive motor controller to build the auxiliary loop negative bus impact current suppression device when the power battery negative contactor is closed, has no change to the existing high-voltage main loop design, basically does not influence the main loop design, and can suppress the auxiliary loop negative bus impact current when the negative contactor is closed by using lower design and manufacturing, thereby improving the reliability of the whole high-voltage loop design.
2. According to the invention, the double-contact mutual exclusion contactor is utilized to inhibit the current of the negative bus when the A contact is closed to realize high-voltage power-on, and the B contact is closed to realize that the EMC circuit of the main drive motor controller is not influenced when the main drive motor controller works normally, so that the risk of adhesion of the impact current of the negative bus to the negative contactor of the power battery can be avoided.
3. According to the invention, the discharge unloading resistor and the double-contact mutual exclusion contactor of the negative bus impact current suppression device are utilized to select the specification, the double-contact contactor of the low-voltage loop can be adopted to suppress the impact current of the high-voltage auxiliary loop, and according to the specification selection principle of the discharge unloading resistor and the double-contact mutual exclusion contactor, the design selection of the discharge unloading resistor and the double-contact mutual exclusion contactor can be rapidly and simply carried out aiming at different high-voltage system designs of the whole car, so that the design difficulty of the system is reduced.
Drawings
Fig. 1 is a schematic diagram of a high voltage power distribution device according to the present invention.
Fig. 2 is an equivalent circuit diagram of a conventional high-voltage power distribution device without a negative bus bar inrush current suppression device.
Fig. 3 is an equivalent circuit diagram of the present invention when the negative bus bar rush current suppression function is implemented.
Fig. 4 is an equivalent circuit diagram of the negative bus bar after the negative bus bar has the function of suppressing the rush current.
Fig. 5 is a flowchart of the present invention when the negative bus bar rush current suppression function is implemented.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific 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 additional or alternative parts unless the use is made, the terms used may generally be in the singular but may also mean the plural.
It should be noted that although the terms "first," "second," "top," "bottom," "one side," "another side," "one end," "the other end," etc. may be used and used in this specification to describe various components, these components and portions should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with top and bottom elements, under certain circumstances, also being interchangeable or convertible with one another; the components at one end and the other end may be the same or different in performance from each other.
In addition, when constituting the components, although 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 "on," "above," "below," and "next," unless words or terms such as "just" or "directly" are used, it is also possible to include cases where there is no contact or contact between them. If a first element is referred to as being "on" a second element, it does not mean that the first element must be located above the second element in the figures. The upper and lower portions of the component will change in response to changes in the angle and orientation of the view. Thus, in the drawings or in actual construction, if it is referred to that a first element is "on" a second element, it can comprise the case that the first element is "under" the second element and the case that the first element is "over" the second element. In describing the time relationship, unless "just" or "direct" is used, a case where there is no discontinuity between steps may be included in describing "after", "subsequent" and "preceding".
The features of the various embodiments of the invention may be combined or spliced with one another, either in part or in whole, and may be implemented in a variety of different configurations as will be well understood by those skilled in the art. Embodiments of the present invention may be performed independently of each other or may be performed together in an interdependent relationship.
The high-voltage power distribution of the new energy vehicle is realized by adopting a power battery high-voltage box and a whole vehicle high-voltage power distribution control module (PDU): the contactor of the negative electrode of the direct current bus is usually placed in a high-voltage box of the power battery, and the on-off of the contactor is controlled by a BMS (battery management system); 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 electrified at high voltage, the BMS controls the battery accessory contactor to be closed firstly, and then the positive contactor of each loop is connected or disconnected according to the instruction sent by the PDU (power unit) according to the HCU (hybrid control unit).
On the one hand, the main drive motor and the controller thereof generally generate stronger conduction radiation on the power supply loop due to the working principle thereof, and are main electromagnetic radiation disturbance sources on the whole new energy vehicle. The common mode inductance and the Y capacitance are normally connected to the bus input side of the main drive motor controller, so that the inductance of the main loop is increased, the impedance to the ground is reduced, and the effect of inhibiting EMI interference is achieved.
On the other hand, due to the existence of the battery to ground distributed capacitance, a charge-discharge loop is formed by taking the battery to ground distributed capacitance (a plurality of micro-methods) as a power supply and taking the high-voltage cable resistance and the bus negative electrode Y capacitance in the main drive electric control controller as loads at the moment when the BMS controls the battery negative electrode contactor to be closed; meanwhile, because the high-voltage cable has small resistance, the differential mode inductance generally introduced in the common mode inductance of the main drive controller and the Y capacitor form an approximate LC oscillating circuit. Thus, when the negative contactor is closed, a high frequency surge current of thousands of amperes in magnitude and a duration of microseconds will be generated on the negative bus bar, the surge current frequency being the resonant frequency of the LC tank circuit.
The invention provides a high-voltage distribution device with a negative bus impact current suppression function, which has the following technical scheme: by improving the design of the main driving safety rule capacitor plate, a software-controlled double-contact mutual exclusion relay and a ground resistor are added on the main driving motor controller safety rule capacitor plate. When a negative electrode contactor in a high-voltage box of the power battery is closed, the double-contact mutual exclusion contactor is controlled to be closed at the point A through software, and the increased ground resistance is accessed to inhibit negative electrode bus impact current in the closing process of the negative electrode contactor; when the closing action of the negative electrode contactor is completed, the double-contact mutual exclusion contactor is controlled to be closed at the point B through software, the connected grounding resistor is bypassed, and the value is connected to the negative electrode bus Y capacitor, so that the bus negative electrode grounding impedance of a main drive system in normal operation is reduced, and the influence on the EMC characteristic of a 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 101, a power battery high-voltage box 102, a whole vehicle high-voltage distribution box 103, a common-mode inductor 105, a main drive motor control circuit 107, a main drive motor 108 and a controller (not shown in the figure), wherein one end of the power battery high-voltage box 102 is connected with the negative electrode of the power battery pack, the other end of the power battery high-voltage distribution box is connected with the negative input end of the common-mode inductor 105, one end of the whole vehicle high-voltage distribution box 103 is connected with the positive electrode of the power battery pack, the other end of the power battery high-voltage distribution box is connected with the positive input end of the common-mode inductor 105, the output end of the common-mode inductor 105 is connected with the input end of the main drive motor control circuit 107, the output end of the main drive motor control circuit 107 is connected with the main drive motor 108, and the control ends of the controller are respectively connected with the power battery high-voltage box, the whole vehicle high-voltage distribution box and the control motor control circuit,
the device further comprises a negative bus impact current suppression device 106, one end of the negative bus impact current suppression device 106 is connected with the negative input end of the common mode inductor 105, the other end of the negative bus impact current suppression device is grounded, the control end of the suppression circuit board is connected with the control end of the controller, and the controller is used for controlling the negative bus impact current suppression device 106 to discharge when the negative contactor is controlled to be closed, and controlling the negative bus impact current suppression device to suppress EMI after the discharge is completed.
In the scheme, 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 inductance, a first movable contact (namely, point A) of the double-contact mutual exclusion contactor is connected with one end of the unloading resistor, a second movable contact (namely, point B) of the double-contact mutual exclusion contactor is connected with one end of the suppression capacitor, and the other ends of the unloading resistor and the suppression capacitor are grounded. When the impact current is restrained, after the controller receives a high-voltage report, the controller controls to firstly control the first movable contact of the double-contact mutual exclusion contactor to be closed, then controls to close the negative electrode contactor in the power battery high-voltage box, after the negative electrode contactor is closed for a set time, controls to open the first movable contact and close the second movable contact, and finally controls to close the positive electrode contactor in the whole vehicle high-voltage distribution box. The set time is 30 to 100ms, preferably 50ms.
When the whole vehicle is electrified at high voltage, the negative electrode contactor in the high-voltage box of the power battery is firstly closed, and in the closing process, if a negative electrode bus impact current suppression device is not adopted, a secondary loop is formed between the power battery and an EMC suppression circuit of the main drive motor controller, and an equivalent circuit of the secondary loop at the moment is shown in fig. 2: 201 is the power battery to ground distributed capacitance C Battery 202 is the insulation resistance R of the power battery cathode to the ground ins- 203 is a power battery negative electrode contactor K 1 204 is a busbar negative differential mode inductance L introduced by a common mode inductance at the busbar input side of the main drive motor controller 104 when the power battery negative contactor is closed 1 205 is the negative Y capacitor C of the main driving motor controller Y 206 is the frame ground. Power battery to ground distributed capacitance C Battery Because the voltage is higher than the negative Y capacitor C of the main drive motor controller Y The former will charge the latter, since the loop impedance is small, and there is a differential mode input inductance L 1 Resulting in current resonance and a rush current on the negative bus that results in thousands of amperes.
The invention adopts the negative bus impact current suppression device, and when the whole vehicle is electrified at high voltage, the double-contact contactor in the negative bus impact current suppression device is controlled to be closed at the point A by the controller before the negative contactor in the high-voltage box of the power battery is closed. When the negative electrode contactor in the high-voltage box of the power battery is closed in a sucking way, the charge of the power battery negative electrode to the ground distributed capacitor is discharged through the series-connected ground resistor, and the discharging current depends on the terminal voltage U of the power battery Battery Series-connected ground unloading resistor R discharge . The equivalent circuit at this time is as shown in fig. 3: 207 double-contact mutual exclusion contactor K 2 208 is a series unloading resistor R discharge 209 is the suppression capacitance, i.e. the negative Y capacitance C of the main drive motor controller Y . Unloading resistor R is closed at contact A through double-contact mutual exclusion contactor discharge And the negative electrode Y capacitor of the main drive controller is bypassed after the main drive controller is connected into a loop in series, so that the effect of inhibiting the impact current of the negative electrode bus is achieved. At this time, the negative bus current I bus- The method meets the following conditions:
I bus- ≤U Battery /R discharge /2
when the closing of the negative electrode contactor of the power battery high-voltage box is completed, the discharging of the power battery negative electrode bus to the ground distributed capacitor is completed, the double-contact mutual exclusion contactor in the negative electrode bus impact current suppression device is controlled by the controller to be closed at the point B, the bus negative electrode Y capacitor is connected in series into a loop, and the discharging unloading resistor is bypassed, so that the effect of suppressing the conducted current EMI interference is achieved. The equivalent circuit at this time is shown in fig. 4.
Regarding the specification and the type selection of the unloading resistor, two considerations of discharge unloading time and discharge current are considered: the discharge unloading time is too long (generally not more than 50 ms), and the high-voltage power-on time of the whole vehicle can be influenced, so that the unloading resistance is not too large; the discharge current is too large, and specification selection of the double-contact mutual exclusion contactor can be affected, so that the cost of the negative bus impact current suppression device is increased. Because the voltage range of the power battery is 400-720 VDC, the power supply of the power battery negative electrode to the ground distributed capacitance is in the range of 200-360 VDC, and the resistance value of the unloading resistor Rdischarge can be 10-20Ω. Meanwhile, certain heat is consumed on the resistor by discharging energy, so that the unloading resistor Rdischarge has certain heating power, and the heating power of the unloading resistor Rdischarge can be 1-2W because of the short discharging time. By combining the two points, the unloading resistor Rdischarge can be selected to be 20 omega/1W or 10 omega/2W.
Regarding the selection of the double-contact mutual exclusion contactor, although the secondary loop is also a high-voltage loop, the double-contact mutual exclusion contactor cannot bear high voltage and high current no matter the contact A or the contact B is closed, so that the double-contact mutual exclusion contactor can be replaced by a low-voltage contactor system, and the specification is selected to be 20A/24V.
In the working process of the negative bus impact current suppression device, the action of the contact is controlled by a controller, and a control flow chart is shown in fig. 5.
It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on 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 meant to be limited to the specific order or hierarchy presented.
The foregoing description of the embodiments and specific examples of the present invention has been presented for purposes of illustration and description; this is not the only form of practicing or implementing the invention as embodied. The description covers the features of the embodiments and 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 sequences of steps.
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 this detailed description, with each claim standing on its own as a separate preferred embodiment of this 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. As will be apparent 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.
The foregoing description 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, as used in the specification or claims, the term "comprising" is intended to be inclusive in a manner similar to the term "comprising," as 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 "non-exclusive or".
Those of skill in the art will further appreciate that the various illustrative logical blocks (illustrative logical block), units, and steps described in connection with the embodiments of the invention may be implemented by electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components (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. Those skilled in the art may implement the described functionality in varying ways for each particular application, but such implementation is not to be understood as beyond the scope of the embodiments of the present invention.
The various illustrative logical blocks or units described in the embodiments of the invention 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. A general purpose processor may be a microprocessor, but in the alternative, the general purpose 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 description is only 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, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. The utility model provides a high-voltage distribution device with negative pole busbar impulse current suppression function, 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, power battery package negative pole is connected to power battery high-voltage box one end, common mode inductance negative pole input is connected to the other end, the anodal positive pole of power battery package is connected to whole car high-voltage distribution box one end, common mode inductance positive pole input is connected to the other end, main motor control circuit's input is connected to common mode inductance's output, main motor control circuit's output is connected to main motor, power battery high-voltage box, whole car high-voltage distribution box and main motor control circuit's control end are connected respectively to the controller control end, its characterized in that:
the device also comprises a negative bus impact current suppression device, one end of the negative bus impact current suppression device is connected with the negative input end of the common mode inductor, the other end of the negative bus impact current suppression device is grounded, 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 bus impact current suppression device to discharge when the negative contactor is controlled to be closed, and controlling the negative bus impact current suppression device to suppress EMI interference after the discharge is completed;
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 inductance, 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 grounded.
2. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 1, wherein: after receiving the high-voltage power-up message, the controller controls to firstly control the first movable contact of the double-contact mutual exclusion contactor to be closed, then controls the negative electrode contactor in the power battery high-voltage box to be closed, after the negative electrode contactor is closed for a set time, controls the first movable contact to be opened, controls the second movable contact to be closed, and finally controls the positive electrode contactor in the whole vehicle high-voltage distribution box to be closed.
3. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 2, wherein: the set time is 30-100 ms.
4. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 3, wherein: the set time is 50ms.
5. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 1, wherein: the resistance value of the unloading resistor is 10-20Ω.
6. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 1, wherein: the heating power of the unloading resistor is 1-2W.
7. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 1, wherein: the suppression capacitor is a parallel capacitor in the control circuit of the main drive motor.
8. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 1, wherein: the working current of the double-contact mutual exclusion contactor is 10-30A.
9. The high-voltage power distribution apparatus with a negative bus bar rush current suppression function according to claim 1, wherein: the working voltage of the double-contact mutual exclusion contactor is 20-50V.
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