SU1677745A1 - Semiconductor converter - Google Patents

Abstract

The invention relates to converter equipment, in particular, to the design of converters for supplying traction engines of mainline electric locomotives with predominantly forced air cooling. The purpose of the invention is to simplify the design and improve the service conditions by simplifying the implementation of a bus bar when performing a converter with open arms. This is achieved by placing the semiconductor devices of one straightening shoulder in each vertical row along the path of the cooling air and placing the anode and cathode groups of the semiconductor devices on opposite sides of the frame for each bridge. 2 Il.

Description

The invention relates to converter equipment, in particular, to the design of converters for supplying main electric locomotives with forced air cooling.

The purpose of the invention is to simplify the design and improve the service conditions by simplifying the implementation of a bus bar when performing a converter with open arms.

Figure 1 shows schematically the structure of the proposed semiconductor converter, front view; figure 2 is the same, top view; fig. 3 - the same, the electrical circuit in principle.

The semiconductor converter contains a frame 1, carrier panels 2 on which semiconductor devices with coolers 3 are mounted. Semiconductor devices of only one arm of the bridge are located in a vertical row in the direction of air movement, thereby preventing the heating of one arm to the other. The direction of air movement can be any: both from above and below.

The semiconductor panels 3 and the carrier panels 2 form the cooling channel 4. The devices of shoulders I and II are located on one side of the cabinet, the devices of shoulders III and IV are located on the other side of the cabinet, which ensures a short connection of the devices to each other. The cathode leads of semiconductor devices are connected by short jumpers to the DC bus 5, the anode ones to the DC bus 6, the cathode leads of arm IV and the diode leads of arm II are connected by a common bus 7, forming the power output of the midpoint of the bridge, conclusions 8 s which are located on opposite sides of the cabinet.

The use of the proposed arrangement of semiconductor devices eliminates the mutual influence of the heating temperature of the air of one arm on the other. Heating the cooling air affects the heating temperature of the structure of semiconductor devices, which is determined by the sum of the following components: the temperature of the cooling medium, the temperature of heating the cooling air, the heating temperature from the power loss in the semiconductor device due to current flow.

The application of the proposed arrangement of semiconductor devices provides a short electrical connection of devices between themselves, which saves the mass of the connected tires and simplifies the design of the connecting buses, provides a two-way connection to

common midpoint of the rectification circuit, which improves the service conditions of the converter.

Claims (1)

Invention Formula Semiconductor converter, containing a frame on which semiconductor devices with conclusions are arranged in parallel and in series connected in a bridge rectifying circuit anodes and cathodes on the service side, while the semiconductors of one straightening arm are located in each vertical row along the direction of the cooling air, AC and DC bus, characterized in that, in order to simplify the design and improve the conditions of service, simplifying the implementation of the bus-bar; the converter is made according to the open-shouldered scheme; on the one side of the cabinet there is an anode group of semiconductor devices, on the other hand a cathode group. g Jl one one I I If J fia1 one t one I four t J 2 about 5  - F (Jf at eight