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Active discharge system of motor controller

A motor controller and active technology, applied in electrical components, output power conversion devices, and AC power input to DC power output, etc., can solve the problem of large voltage change rate current change rate, IGBT easily damaged, and increased hardware circuit costs. and other problems, to achieve the effect of reducing the voltage change rate and current change rate, and reducing the cost

Pending Publication Date: 2017-09-22
SUZHOU INOSA UNITED POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is fast, low in cost, and does not require additional hardware circuits, but this method leads to large current, voltage change rate (dv / dt) and current change rate (di / dt) of the IGBT tube, and the DC voltage In the case of too high, the IGBT is easily damaged
[0006] In order to solve the problem in the second method, the third method controls the IGBT lower tube to work in the linear region, thus reducing the current stress of the IGBT, but in order to make the IGBT work in the linear region, a backup drive circuit (including push Pull the triode, drive the power supply circuit such as linear regulator, etc.), which increases the cost of additional hardware circuit

Method used

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  • Active discharge system of motor controller
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  • Active discharge system of motor controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] combine figure 1 ,refer to figure 2 , the active discharge system of the motor controller in Embodiment 1 includes: a control module 100, a plurality of drive modules 201, 202, 301, 302, 401, 402 ( figure 2 The driving modules corresponding to the remaining two-phase bridge arms are not shown), the upper bridge driving power module 500, the lower bridge driving power module 600, and the driving switching modules 701 and 702 corresponding to the driving modules 201 and 202. It can be understood that, because This embodiment only shows the active short-circuit scheme realized by one-phase bridge arm, so only two drive switching modules need to be designed, and in fact, it can also be extended to the active short-circuit scheme realized by two-phase or three-phase bridge arm, only need to add the corresponding The number of drive switching modules is sufficient.

[0052] Wherein, the two input ends and one control end of the drive switching modules 701, 702 are respect...

Embodiment 2

[0063] refer to image 3 , both the upper bridge drive power supply module 500 and the lower bridge drive power supply module 600 specifically include: a drive power supply unit and a feedback adjustment unit. Wherein, the feedback adjustment unit of the lower bridge drive power supply module 600 is also connected to the control module 100, and the control module 100 triggers the feedback adjustment unit of the lower bridge arm to reduce the output by increasing the sampling voltage or reducing the set reference value when active discharge is required. Voltage.

[0064] Specifically, the feedback adjustment unit specifically includes: a voltage sampling subunit and an adjustment subunit. The drive power supply unit includes a drive power supply, an energy storage module, and a voltage stabilizing module. The first end of the energy storage module is connected to the positive power supply terminal, and the second end of the energy storage module is connected to the negative po...

Embodiment 3

[0075] refer to Figure 4 Compared with the second embodiment, the third embodiment differs in that the voltage boosting subunit 604 is connected in parallel with the second sampling resistor R_22, and the voltage boosting subunit 604 includes a second controllable switch S_3 and a second controllable switch S_3 connected in series. Two adjustment resistors R_32, the control terminal of the second controllable switch S_3 is connected to the control module 100, and the control module 100 triggers the switching of the second controllable switch S_3 from the on state to the off state when active discharge is required .

[0076] The principle of reducing the output voltage of the lower bridge drive power module in this embodiment: When active discharge is required, the MCU sends the MCU_FD signal, the switch S_3 is turned on, and the resistor R_32 is no longer connected to the circuit, causing the current of the current resistor R_22 to become larger and sent to The sampling volt...

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Abstract

The invention discloses an active discharge system of a motor controller. The active discharge system comprises a control module, a plurality of driving modules, an upper bridge driving power supply module and a lower bridge driving power supply module, wherein the driving modules are connected with the control module and semiconductor switches in corresponding bridge arms; the upper bridge driving power supply module is connected with the driving modules corresponding to all upper bridge arms; the lower bridge driving power supply module is connected with the control module and the driving modules corresponding to all lower bridge arms; and when the control module needs to perform active discharge, the driving modules corresponding to the upper bridge arms are triggered to drive the semiconductor switches in the upper bridge arms to enter straight-through states, the lower bridge driving power supply module is triggered to lower output voltages output to the driving modules corresponding to the lower bridge arms at the same time in order that the semiconductor switches in the lower bridge arms enter a linear region, and the driving modules corresponding to the lower bridge arms are triggered to drive the semiconductor switches in corresponding lower bridge arms to enter short-term on-off states. Through adoption of the active discharge system, cost is lowered, and voltage and current change rates of the semiconductor switches of the lower bridge arms in an active discharge process can be reduced.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to an active discharge system for a motor controller. Background technique [0002] To drive one or more electric motors and other high-voltage power-consuming loads in an electric vehicle, a voltage inverter with a DC voltage intermediate circuit is provided in the electric vehicle. After removing the corresponding connection, or energy separation caused by failure or accident, all energy storage units connected to the energy source or the DC voltage intermediate circuit must be quickly discharged to less than 60V in a short time in consideration of the safety of people in the vehicle. This rapid discharge process is called active discharge. [0003] There are three current active discharge schemes. [0004] The first method adopts the method that after the switch is connected in series with the power resistor, it is connected in parallel at both ends of the DC capacitor. By cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/5395
CPCH02M7/53873H02M7/5395
Inventor 张弛
Owner SUZHOU INOSA UNITED POWER SYST CO LTD
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