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Electric vehicle driving device

A driving device and trolley technology, applied in the direction of electric vehicles, electric braking systems, AC motor control, etc., to achieve the effect of stable communication

Inactive Publication Date: 2011-01-26
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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Examples

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Embodiment 1

[0030] figure 1 It is a block diagram showing a schematic configuration of a first embodiment of the electric vehicle driving device of the present invention.

[0031] First, the main circuit 25 will be described. The DC power supply 1 is a direct current tram line (overhead), or an on-board engine generator+rectifier, or an AC tram line (overhead)+converter. The DC power source 1 is connected to a plurality of dynamic brakes 19 , a smoothing capacitor 5 and an inverter 6 through a first switch 2 . A motor 7 serving as a power source for driving the electric car is connected to the inverter 6 .

[0032] To both ends of the smoothing capacitor 5 , for example, N dynamic braking circuits 19 are connected in parallel. The generating brake circuit 19 is constituted as a series circuit of a brake chopper switch circuit 3 and a resistor 4 (hereinafter referred to as a brake resistor), wherein the brake chopper switch circuit 3 is used for controlling regenerative power, and the ...

Embodiment 2

[0046] Figure 5 It is a block diagram showing a schematic configuration of a second embodiment of the electric vehicle driving device of the present invention. The structure of the main circuit 25 is the same as that of the first embodiment. In the second embodiment, carrier triangle waves of different frequencies are supplied to the respective brake chopper switch circuits 3 of the switch control unit 26 .

[0047] The frequency calculation unit 11 provided in the switch control unit 26 receives the number N of brake chopper switch circuits 3 and calculates the frequency of the carrier triangular wave of each brake chopper switch circuit 3 . For example, the frequency fBCH of the carrier triangular wave is determined as in the following equation (2).

[0048] fBCHn=fO+(n-1)×Δf...(2)

[0049] Here, n represents the nth brake chopper switch circuit 3 (n=1 to N). N is the number of parallel brake chopper switch circuits 3 . Therefore, all the triangular carrier wave freque...

Embodiment 3

[0062] Figure 6 It is a block diagram showing a schematic configuration of a third embodiment of the electric vehicle driving device of the present invention.

[0063] As usual, one dynamic braking circuit 19 is provided for one inverter circuit in the main circuit 25 . The switch control unit 26 includes a frequency calculation unit 12 , a carrier triangle wave generator 9 , a phase estimation unit 27 , and a comparator 10 . The phase estimation unit 27 receives the carrier triangular wave frequency fBCH from the frequency calculation unit 12, and calculates the phase θ (0° to 360°) of the triangular wave according to the following equation (4).

[0064] [mathematical formula 2]

[0065] θ=∫(2×π×fBCH)dt…(4)

[0066] The frequency calculating unit 12 calculates the carrier frequency fBCH based on the phase θ input from the phase estimating unit 27 . The carrier triangular wave generator 9 generates the carrier triangular wave of the brake chopper switching circuit 3 accor...

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Abstract

Provided is an electric vehicle driving device which consumes regenerative energy at a brake resistor, wherein a harmonic component produced by a brake chopper switching circuit can be reduced. A plurality of brake chopper switching circuits (3) are provided in parallel for each inverter (6). Harmonic components produced by the brake chopper switching circuits (3) are reduced by mutually changingthe phase or frequency of the carrier triangular wave of each of the switching circuits (3).

Description

technical field [0001] The present invention relates to an electric vehicle driving device that uses a braking resistor to consume surplus energy generated during regenerative braking. Background technique [0002] There is an operation mode called dynamic braking in which a driving device for electric cars for railways consumes regenerative energy generated by a motor driving a wheel by using a braking resistor during braking. In this mode, the conduction ratio calculated from the filter capacitor voltage on the DC voltage input side of the inverter (inverter) driving the motor is compared with the brake chopper carrier triangular wave. Based on the comparison result, a gate signal of a brake chopper switching circuit is generated to control the conduction state of the switching element. [0003] Such high-frequency wave components generated when the brake chopper switching circuit operates sometimes bring inductive interference to the feed system. There are JP-A-9-140165...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/06B60L7/22B60L9/18H02M7/48H02P27/06B60L50/13
CPCB60L9/16B60L2200/26B60L7/16H02M7/797B60L7/22B60L7/06B60L2270/147B60L50/13Y02T10/7072Y02T10/70
Inventor 林敏松冈学宫崎玲结城和明
Owner KK TOSHIBA
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