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A composite active discharge method and system for high-voltage bus capacitors
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A high-voltage bus and composite technology, which is applied to the composite active discharge method and system field of high-voltage bus capacitors, can solve the problems of inability to complete active discharge and high cost, so as to avoid inability to actively discharge, low cost, and improve safety and reliability sexual effect
Active Publication Date: 2019-11-26
SUZHOU INOSA UNITED POWER SYST CO LTD
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a low-cost, high-reliability electric discharge device that can still be discharged in case of a single-point fault in view of the above-mentioned defects of the prior art that the cost is high and the active discharge cannot be completed in the case of a single-point fault. Composite active discharge method and system for high-voltage bus capacitors of automobiles
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Embodiment 1
[0040] reference figure 1 , figure 1 It is a flowchart of the first embodiment of the present invention. The first embodiment discloses a compound active discharging method of high-voltage bus capacitors, including the following steps:
[0041] S0. Determine whether the first discharge path and the second discharge path are both normal, if yes, go to step S1, otherwise go to step S4;
[0042] S1. When the voltage of the high-voltage bus capacitor is higher than the first preset value, start the first discharge path and the second discharge path at the same time, until the voltage of the high-voltage bus capacitor drops to the first preset value, go to step S2;
[0043] S2, when the voltage of the high-voltage bus capacitor drops to the first preset value, close the first discharge path until the voltage of the high-voltage bus capacitor drops to a safe threshold, and then go to step S3;
[0044] S3. When the voltage of the high-voltage bus capacitor drops to a safe threshold, the seco...
Embodiment 2
[0052] reference figure 2 , Is a schematic diagram of the second embodiment of the present invention. This embodiment discloses a composite active discharge system for high-voltage bus capacitors, including: high-voltage auxiliary power supply, low-voltage auxiliary power supply, step-down module, control module (not shown), three-phase inverter in the motor controller, Motor.
[0053] Among them, the low-voltage auxiliary power supply is connected to the high-voltage bus capacitor via the step-down module, so the energy of the high-voltage bus capacitor can be transferred to the low-voltage auxiliary power supply for consumption through the step-down module, forming the first discharge path; the high-voltage auxiliary power supply is connected to the high-voltage bus capacitor, so The energy of the high-voltage bus capacitor can be directly transferred to the high-voltage auxiliary power supply for consumption to form a second discharge path; the motor is connected to the high...
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Abstract
A compound active discharge method and system for high-voltage bus capacitors, the method comprising: S0, judging whether the first discharge path and the second discharge path are normal, if so, enter S1, otherwise enter S4; S1, simultaneously start the first, The second discharge path; S2, when the voltage of the bus capacitor drops to the first preset value, close the first discharge path; S3, when the voltage of the bus capacitor drops to the safety threshold, close the second discharge path, and end ;S4: Start the third discharge path, and close the third discharge path when the voltage of the bus capacitor drops to the safety threshold, and end; wherein, the first discharge path is discharged through the step-down module and the low-voltage auxiliary power supply, and the second discharge path The path is to discharge through the high-voltage auxiliary power supply; the third discharge path is to discharge through the inverter and the motor. The invention has low cost and small size; the working voltage range of the step-down module is narrowed; the risk of single point failure of the system can be avoided, and the reliability of the system can be improved.
Description
Technical field [0001] The invention relates to the field of electric vehicles, in particular to a composite active discharge method and system for high-voltage bus capacitors applied to electric vehicles. Background technique [0002] For safety reasons, when the electric vehicle stops running, the energy stored in the bus capacitor needs to be quickly discharged through the motor controller. It is generally required to drop the bus voltage to below 60V within 2s. [0003] In the prior art, in order to achieve the above discharge requirements, the DCDC converter is usually used to actively discharge the solution, that is, within the working voltage range of the DCDC converter, the DCDC converter first transfers the bus capacitor energy to the low-voltage battery in the form of peak power output. When the bus voltage drops to the normal operating voltage range of the DCDC converter, it is output to the low-voltage battery with a smaller power. However, this kind of discharge meth...
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Application Information
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