Electric power conversion device and electric power conversion method
A power conversion device and power technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of increased load, different wiring lengths, and no consideration of the structure of metal parts, etc. It is easy to achieve miniaturization and increase The effect of load
Inactive Publication Date: 2010-05-12
HITACHI LTD
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Problems solved by technology
However, in this prior art, the positive side and the negative side of the integral metal part branching from the DC power supply to each switching element have the same shape, and there is no metal part that takes into account the wiring from the switching element to the output combining point. Structure
Therefore, there is a problem of increasing the size of the entire power conversion device, and there is also a problem that the wiring length from the DC power supply to the output combining point is different, which becomes an obstacle to an increase in the load.
Method used
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[0021] Embodiments of the present invention will be described with reference to the drawings.
[0022] First, use Figure 7 The basic operation of the power conversion device a will be described.
[0023] The power conversion device a receives a DC voltage 2 (voltage 2E [V]) from a power supply port 3 . This DC voltage is supplied to the basic power conversion main circuit 1 through the DC buses 4 and 5 . Here, in the basic power conversion main circuit 1, the switches 1a and 1b are turned on / off alternately for any length of time, and are controlled not to be turned on at the same time, so as to forward / reverse convert the DC voltage 2 into an AC voltage. In addition, the on / off of the switch is based on the on / off command controlled by the control device of the power conversion device, one of which is, for example, Figure 8 shown. Here, when the switch 1a is turned on, depending on its on-time current, the current reaching the load 8 via the DC voltage 2-DC bus 4-switch...
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The object of this invention is to achieve desired power conversion capacity N*P[W], without using special wiring parts, in a power converter where n pieces of basic power converting main circuits ofcapacity P[W] are connected in parallel so as to increase the capacity of its power conversion. The relative mounting positional relation between a power supply port (3) and a current output point (7)is put on a diagonal (14) between power converting main circuits (11P) and (12P). Hereby, each impedance becomes the same in a current path which reaches a current output point (7), passing each of the basic power converting main circuits (11P) and (12P) from DC voltage (2). Hereby, the power converter of desired power conversion capacity N*P[W] is built without using special wiring parts for parallel connection.
Description
technical field [0001] The invention relates to a power conversion device and a power conversion method. Background technique [0002] A power conversion device is used to rotate the electric motor at an arbitrary rotational speed. In the power conversion device, generally, the positive side DC power supply is connected to the output point via a switching element, and the negative side DC power supply is connected to the output point via another switching element. By turning ON / OFF the switching element on the positive side and the switching element on the negative side, a substantially AC waveform is generated. [0003] However, electric motors with a large load (capacity) are used in steel rolling facilities and the like. Therefore, the load capacity is increased by using a power conversion circuit as a basic configuration and connecting them in parallel. In this case, the positive-side DC power supply and the negative-side DC power supply of the power supply are input ...
Claims
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IPC IPC(8): H02M7/02
Inventor 永田宽门三野洋二西川惠一郎
Owner HITACHI LTD