CN221009810U - Circuit board integrated passive discharge circuit - Google Patents
Circuit board integrated passive discharge circuit Download PDFInfo
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- CN221009810U CN221009810U CN202322810552.6U CN202322810552U CN221009810U CN 221009810 U CN221009810 U CN 221009810U CN 202322810552 U CN202322810552 U CN 202322810552U CN 221009810 U CN221009810 U CN 221009810U
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- 239000003990 capacitor Substances 0.000 claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 230000010354 integration Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 9
- 230000017525 heat dissipation Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a circuit board integrated passive discharge circuit which is used for a motor controller for a vehicle and comprises a direct-current supporting capacitor integrated on an IGBT driving circuit board, a high-voltage current limiting circuit formed by connecting a plurality of power resistors in series, a discharge circuit and a high-voltage detection sensing circuit, wherein the direct-current supporting capacitor is connected with the IGBT driving circuit board in series; the direct-current supporting capacitor is connected to the high-voltage direct-current transmission line, the input end of the high-voltage current limiting circuit is connected with the direct-current supporting capacitor, the output end of the high-voltage current limiting circuit is connected with the input end of the discharging circuit, and the output end of the discharging circuit is connected with the high-voltage detection sensing circuit. The passive discharging circuit cancels the independent external discharging resistor, adopts the form of a circuit board integrated discharging circuit, greatly improves the space utilization rate of the motor controller, simultaneously has small heating value of a single resistor due to the serial integration of the power resistors, and has small discharging current and low overall heating value of the resistor due to the fact that the discharging circuit is a high-voltage detection sensing circuit.
Description
Technical Field
The utility model relates to the technical field of motor controllers for vehicles, in particular to a circuit board integrated passive discharge circuit.
Background
Because of the existence of the direct current supporting capacitor of the motor controller for the vehicle, the discharging passage is required to release the electric energy stored in the supporting capacitor after the whole vehicle is stopped, so that the electric safety of the whole vehicle is ensured. It is clearly specified in GB/T18488.1-2015 that the time required for passively discharging the supporting capacitor of the driving motor controller to 60V should be less than 5min. The current common passive discharge circuit design is to connect an independent discharge resistor on a supporting capacitor of a motor controller, and connect the discharge resistor with the supporting capacitor in a flying wire or bridging mode to form the passive discharge circuit. The circuit design can allow for quick replacement of the discharge resistor during maintenance and support reduction of the passive discharge duration within the heat dissipation capacity of the controller.
The conventional fly line or bridge type passive discharge circuit is shown in FIG. 1, assuming that the HVDC voltage is 400V, the capacitance value of the DC supporting capacitor 3 is 800 μF, the rated voltage is 400V, and the passive discharge time from 400V to 60V of 190.5s is taken as the target, and the passive discharge resistor is obtained by back calculationDischarge current/>Heating power of discharge resistor/> Therefore, the discharge resistor selected by the traditional flying lead or bridging type passive discharge circuit generally has large resistance requirement and high heating power, and is difficult to select a market finished product, and special development is required, so that the cost is increased. Meanwhile, the external single device can increase the overall space size of the motor controller, and the risk of poor contact at the plugging position after multiple replacement exists. In addition, in the initial stage of the structural design of the motor controller, the heat dissipation problem of the independent device needs to be considered, so that the design difficulty and the manufacturing difficulty are increased.
Disclosure of utility model
The utility model aims to solve the problems of the conventional passive discharge circuit of the motor controller for the vehicle and provides a circuit board integrated passive discharge circuit.
The aim of the utility model is realized by the following technical scheme:
The integrated passive discharge circuit of a circuit board is mainly provided, and is used for a motor controller of a vehicle, and the integrated passive discharge circuit comprises a direct current support capacitor integrated on an IGBT driving circuit board, a high-voltage current limiting circuit formed by connecting a plurality of power resistors in series, a discharge circuit and a high-voltage detection sensing circuit; the direct-current supporting capacitor is connected to the high-voltage direct-current transmission line, the input end of the high-voltage current limiting circuit is connected with the direct-current supporting capacitor, the output end of the high-voltage current limiting circuit is connected with the input end of the discharging circuit, and the output end of the discharging circuit is connected with the high-voltage detection sensing circuit.
As a preferred option, the circuit board integrated passive discharge circuit comprises resistors R1-R5 which are sequentially connected in series.
As a preferred option, a circuit board integrated passive discharging circuit comprises a resistor R6, a pull-down resistor R7, a capacitor C2 and a capacitor C3 connected in parallel in sequence, wherein a capacitor C1 is connected in series to a branch where the resistor R6 is located.
As a preferred option, the circuit board integrated passive discharging circuit comprises a high-voltage isolation sensing chip, and the discharging circuit is connected to an SHTDN pin of the high-voltage isolation sensing chip.
As a preferred option, the type of the high-voltage isolation sensing chip is ACPL-C87BT-500E.
As a preferred option, a circuit board integrated passive discharge circuit has a resistance value of 47kΩ for resistors R1-R4 and a resistance value of 3.6kΩ for resistor R5.
As a preferred option, a circuit board integrated passive discharge circuit has a resistance of 2.7kΩ for resistor R6 and 10nF for capacitors C2 and C3.
As a preferred option, a circuit board integrated passive discharge circuit, the capacitance of the dc supporting capacitor is 800 μf.
It should be further noted that the technical features corresponding to the above options may be combined with each other or replaced to form a new technical scheme without collision.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The passive discharging circuit cancels the independent external discharging resistor, adopts the form of the integrated discharging circuit of the circuit board, ensures that the whole space structure of the motor controller has higher integration level and higher energy density level, greatly improves the space utilization rate of the motor controller, simultaneously has small heating value of a single resistor due to the serial connection integration of the power resistor, and has small discharging current and low whole heating value of the resistor due to the fact that the discharging circuit is a high-voltage detection sensing circuit, thereby solving the problem of difficult heat dissipation design.
(2) The design of the discharge circuit relies on detection of various processes during production of the circuit board, so that the reliability of the discharge circuit is better ensured compared with the traditional external independent discharge resistor.
(3) The discharge circuit has small discharge current, so that the heating power is negligible, and therefore, the corresponding heat dissipation design is not needed to be considered additionally, compared with the traditional external independent discharge resistor, the structure design difficulty of the whole motor controller is reduced, the development period is shortened, and the development cost is reduced to a certain extent.
(4) Different from the traditional externally connected independent discharge resistor, only one discharge resistor can be externally connected due to the limitation of space size, so that the requirements on various parameters are high, and special development is needed; the discharging resistor of the discharging circuit can be arranged on the circuit board in a mode of connecting multiple power resistors in series, can disperse higher parameter requirements on each independent power resistor, can directly select from finished products in the market for purchase, and has overall cost reduced compared with the traditional external connection mode.
Drawings
FIG. 1 is a schematic diagram of a conventional passive discharge circuit;
Fig. 2 is a schematic diagram of a circuit board integrated passive discharge circuit according to the present utility model.
Reference numerals in the drawings: 1. a direct current support capacitor; 2. a high voltage current limiting circuit; 3. a discharge circuit; 4. and a high voltage detection sensing circuit.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully understood from the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In an exemplary embodiment, a circuit board integrated passive discharge circuit is provided, and the circuit board integrated passive discharge circuit is used for a motor controller of a vehicle, and comprises a direct current support capacitor 1 integrated on an IGBT driving circuit board, a high-voltage current limiting circuit 2 formed by connecting a plurality of power resistors in series, a discharge circuit 3 and a high-voltage detection sensing circuit 4; the direct current supporting capacitor 1 is connected to a high-voltage direct current transmission line, the input end of the high-voltage current limiting circuit 2 is connected with the direct current supporting capacitor 1, the output end of the high-voltage current limiting circuit 2 is connected with the input end of the discharging circuit 3, and the output end of the discharging circuit 3 is connected with the high-voltage detection sensing circuit 4.
The power resistor can be called a discharge resistor, is integrated on the IGBT driving circuit board in series, and is used for building a high-voltage detection sensing circuit by sharing an SHTDN pin of the high-voltage isolation sensing chip; the circuit design greatly improves the space utilization rate of the motor controller, meanwhile, the heat productivity of a single resistor is small due to the fact that the discharge resistors are integrated in series, and the overall heat productivity of the resistor is also reduced due to the fact that the discharge channel is a high-voltage sensing circuit at the same time, and the discharge current is small.
Specifically, referring to fig. 2, the high voltage current limiting circuit 2 includes resistors R1-R5 connected in series. The discharging circuit 3 comprises a resistor R6, a pull-down resistor R7, a capacitor C2 and a capacitor C3 which are sequentially connected in parallel, wherein a capacitor C1 is connected in series on a branch where the resistor R6 is located. The discharging circuit 3 is connected to the SHTDN pin of the high-voltage isolation sensing chip. The model of the high-voltage isolation sensing chip is ACPL-C87BT-500E.
Further, the working process of the passive discharging circuit is as follows:
During normal power-on operation of the whole vehicle, the high voltage at the HV+/HV-end is limited by the five high-resistance power resistors of the circuits R1, R2, R3, R4 and R5, and the SHTDN pin of ACPL-C87BT-500E is kept at a low level through the pull-down resistor R7 and the discharging circuit 3, so that the normal operation of the motor controller is ensured;
After the whole vehicle is powered down, the 'ACPL-C87 BT-500E' chip stops working, the connection between the discharge circuit and the low-voltage signal circuit is cut off by an isolating mechanism in the chip, and meanwhile, the electric energy stored by the direct-current support capacitor 1 is released through the discharge circuit 3 through five power resistors R1, R2, R3, R4 and R5;
In this example, the HVDC voltage is 400V, the capacitance of the dc supporting capacitor 1 is 800 μf, the rated voltage is 400V, the resistances of the resistors R1, R2, R3, R4 are 47kΩ, the rated power is 1W, the resistance of the resistor R5 is 3.6kΩ, the rated power is 125mW, the resistance of the resistor R6 is 2.7k, the rated power is 125mW, the capacitance of the capacitor C1 is 1 μf, the rated voltage is 25V, the capacitance of the capacitors C2, C3 is 10nF, and the rated voltage is 50V. According to the data, the discharge current after the whole vehicle is powered down can be calculated:
Heating power of single resistor:
Time required for discharging to 60V
Furthermore, two discharge circuits are connected in parallel in the same motor controller, so that the actual passive discharge time is 381/2=190.5s, the discharge time meets the national standard requirement, the heating power of the discharge resistor is only 1/7 of the rated power, and a heat dissipation system is not required to be additionally designed.
The foregoing detailed description of the utility model is provided for illustration, and it is not to be construed that the detailed description of the utility model is limited to only those illustration, but that several simple deductions and substitutions can be made by those skilled in the art without departing from the spirit of the utility model, and are to be considered as falling within the scope of the utility model.
Claims (8)
1. The integrated passive discharge circuit of the circuit board is used for a motor controller of a vehicle and is characterized by comprising a direct-current supporting capacitor integrated on an IGBT driving circuit board, a high-voltage current limiting circuit formed by connecting a plurality of power resistors in series, a discharge circuit and a high-voltage detection sensing circuit; the direct-current supporting capacitor is connected to the high-voltage direct-current transmission line, the input end of the high-voltage current limiting circuit is connected with the direct-current supporting capacitor, the output end of the high-voltage current limiting circuit is connected with the input end of the discharging circuit, and the output end of the discharging circuit is connected with the high-voltage detection sensing circuit.
2. The circuit board integrated passive discharge circuit of claim 1, wherein the high voltage current limiting circuit comprises resistors R1-R5 in series.
3. The circuit board integrated passive discharging circuit according to claim 1, wherein the discharging circuit comprises a resistor R6, a pull-down resistor R7, a capacitor C2 and a capacitor C3 connected in parallel in sequence, wherein the resistor R6 is connected in series with the capacitor C1.
4. A circuit board integrated passive discharge circuit according to claim 3, wherein the high voltage detection sensing circuit comprises a high voltage isolation sensing chip, the discharge circuit being connected to the SHTDN pin of the high voltage isolation sensing chip.
5. The circuit board integrated passive discharge circuit of claim 4, wherein said high voltage isolation sensor chip is ACPL-C87BT-500E.
6. The circuit board integrated passive discharge circuit of claim 2, wherein the resistors R1-R4 have a resistance of 47kΩ and the resistor R5 has a resistance of 3.6kΩ.
7. A circuit board integrated passive discharge circuit according to claim 3, wherein the resistance of the resistor R6 is 2.7kΩ, and the capacitance of the capacitor C2 and the capacitance of the capacitor C3 are 10nF.
8. The circuit board integrated passive discharge circuit of claim 1, wherein the capacitance of the dc support capacitor is 800 μf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322810552.6U CN221009810U (en) | 2023-10-19 | 2023-10-19 | Circuit board integrated passive discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322810552.6U CN221009810U (en) | 2023-10-19 | 2023-10-19 | Circuit board integrated passive discharge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221009810U true CN221009810U (en) | 2024-05-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322810552.6U Active CN221009810U (en) | 2023-10-19 | 2023-10-19 | Circuit board integrated passive discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221009810U (en) |
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2023
- 2023-10-19 CN CN202322810552.6U patent/CN221009810U/en active Active
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