JPH0538147A - Rectifier - Google Patents

Abstract

PURPOSE:To obtain a rectifier capable of operating indepently every rectification unit. CONSTITUTION:Three phase bridge series 12 phase rectifier circuits 4a and 4b are connected to a transformer 1 in parallel. Accordingly, they can easily correspond to capacity variations of a device and, at the same time, they can be standardized, kinds of rectification units can be reduced, and even if one rectification unit fails, one side operation can be made with the other rectification unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectifier, and more particularly to a rectifier having a 3-phase bridge series 12-phase rectifier circuit.

[0002]

2. Description of the Related Art FIG. 2 is a circuit diagram showing a conventional rectifying device. In the figure, 1 is a transformer, 1a is a secondary winding that is in phase with the primary side of the transformer 1, 1b is a secondary winding that is behind the primary side of the transformer 1 by an electrical angle of 30 °, and 2 is The rectifying element 3a is connected to the secondary winding 1a of the transformer 1, and the rectifying unit 3b that forms a three-phase bridge circuit using a plurality of rectifying elements 2 is connected to the secondary winding 1b of the transformer 1. A rectifying unit that uses a plurality of rectifying elements 3 to form a three-phase bridge circuit. Then, here, the rectifying units 3a and 3b, which are three-phase bridge circuits, are connected in series to form a three-phase bridge series phase rectifier circuit. Here, two rectifying elements 2 of each rectifying arm in the three-phase bridge circuit are connected in parallel in order to increase the capacity of the device. For simplification, FIG. 3 is a configuration diagram showing a three-phase bridge series 12-phase rectifier circuit 4 in the case where the number of rectifier elements 2 constituting each rectifier arm is one.

Next, the operation will be described. The AC power input to the transformer 1 is given a phase difference by the secondary windings 1a and 1b thereof, and then rectified by the rectification units 3a and 3b to generate 12-phase DC power at the output terminal P.
Taken out between -N.

[0004]

Since the conventional rectifying device is configured as described above, the parallel increase of the rectifying elements due to the increase in capacity must be configured inside the rectifying unit, and the unit is increased for each capacity. There is a problem in that it has to be manufactured, and if the rectifying element inside the rectifying unit is damaged for some reason, the operation of the entire device must be stopped.

The present invention has been made to solve the above problems, and can easily cope with a change in the capacity of a device, and even if the rectifying unit should fail, it can be left by disconnecting the rectifying unit. It is an object of the present invention to provide a rectifying device that can be continuously operated only by the above unit.

[0006]

SUMMARY OF THE INVENTION A rectifying device according to the present invention includes a first rectifying unit that rectifies AC power to generate 12-phase DC power, and is connected in parallel to the first rectifying unit. And a second rectifying unit that rectifies electric power to generate 12-phase DC power.

[0007]

In the present invention, the rectifying unit can be standardized into one type, which is economical, and even in the unlikely event of an accident during operation, the defective rectifying unit can be separated and the remaining rectifying units can continue operation.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the figure, 1, 1a, 1b and 2 are the same as those of the conventional device. Reference numeral 4a denotes a three-phase bridge serial phase rectifier circuit as a first rectifier unit, and reference numeral 4b denotes a three-phase bridge serial 12-phase rectifier circuit as a second rectifier unit. The input side of the three-phase bridge serially connected phase rectifier circuit 4a is connected to the secondary windings 1a and 1b of the transformer 1, and the output side is connected between the output terminals PN. The input side of the three-phase bridge series 12-phase rectifier circuit 4b is also the transformer 1-2.
The secondary windings 1a and 1b are connected to each other, and the output side is connected between the output terminals P and N. In other words, three-phase bridge series 1
The two-phase rectifier circuits 4a and 4b are connected in parallel.

Next, the operation will be described. The AC power input to the transformer 1 is given a phase difference by the secondary windings 1a and 1b thereof, and then rectified into 12 phases by the 3-phase bridge series 12-phase rectifier circuits 4a and 4b, respectively. It is taken out as 12-phase DC power between P and N.
Then, in the unlikely event that one of the three-phase bridge series 12-phase rectifier circuits 4a or 4b fails, the failed one is cut off, and the other that does not fail is used to continue operation, so-called single lung operation. The increase in the number of parallel elements corresponding to the increase in the capacity of the device can be dealt with by increasing the number of rectifying units, that is, three-phase bridge series 12-phase rectifying circuits.

[0010]

As described above, according to the present invention, a first rectifying unit for rectifying AC power to generate 12-phase DC power, and an AC power connected in parallel to the first rectifying unit. Since the second rectifying unit that rectifies the current to generate 12-phase DC power is provided, each rectifying unit can operate independently, and thus can easily cope with a change in the capacity of the device and can be standardized. The manufacturing of the unit is simplified and economical, and even in the unlikely event of a rectification unit failure, the rectification unit can be separated and the remaining rectification units can continue operation, so that a highly reliable rectification device can be obtained. is there.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a rectifying device according to the present invention.

FIG. 2 is a circuit diagram showing a conventional rectifying device.

FIG. 3 is a circuit diagram showing a conventional 3-phase bridge series 12-phase rectifier circuit.

[Explanation of symbols]

 4a 3 phase bridge series 12 phase rectifier circuit 4b 3 phase bridge series 12 phase rectifier circuit

Claims (1)

Claim: What is claimed is: 1. A first rectifying unit that rectifies alternating current power to generate 12-phase direct current power, and a first rectifying unit that is connected in parallel and rectifies alternating current power. And a second rectifying unit that generates DC power of a phase.