SU547017A1 - Multiphase rectifier - Google Patents

Description

rectifiers; in fig. 2 - the same, made in the form of three two-semi-aryed straighteners.

A three-phase trays rods (/ yrmator 1 vglpr metel (see Fig. 1)) are located on two secondary secondary windings connected in two three-phase stars with a midpoint. Valves 2–7, cathodes are included in the secondary phase windings. which are connected and the load 8 is connected to the nanometer. Such switching on of the valves allows placing them on the heat sink. Each midpoint of the three-phase rectifiers is connected to the chokes 9 and 10, the other terminals of which are combined and connected to another load terminal 8. Parallel to the load 8 is turned on condensate op 11, a yugi, an element of a smoothing filter. In some cases, the capacitor 11 is not molset. The primary winding of the transformer 1 can be connected both in a star and in a triangle.

The rectifier works as follows. As in the three-phase scheme with a midpoint, each valve conducts a current for 1/3 of the period. At any moment of time, that ventpl is open and conducts current, the potential of the anode with respect to the midpoint of this secondary winding is higher than that of other valves. Since the phase voltage stars of the two secondary windings of the transformer are sorted by 180 relative to each other, at any time the positive voltage is applied to the anodes of the two valves belonging to different three-phase devices, i.e. the wire is open at any time t current two vents pz six.

Commutation, and the current from the valve to the valve is originated at the moment of intersection of the sinusoids of the phase voltages.

The rectified current flowing through the load 8 is made up of two anode currents of the valves 4, therefore, the maximum reduction of the currents of the secondary winding of the transformer and the valve is half the load current, and their average value is 1/6 of the load current.

The rectifier (see Fig. 2) consists of a three-phase transformer 1 with two secondary windings connected to (a pestle star with a midpoint, valves 2-7, three 5 chokes 9, 10 and 12, capacitor II fnltra and load 8 Ventnln 2-7 are connected ponarno n connected respectively to the throttles m 9, 10 and 12. As a result, three breathing groups are formed, each of which

10 is a mid-point two-half-rectifier rectifier operating on inductance. Due to this, that the phases of the alternating strains, intrinsic straightening groups, are shifted relative to each other.

15 friends on 120 el. hail., the second and third harmonics of pulsation at the output of the rectifier are absent, and the main frequency of the pulsation of the output voltage is about 1 times the power of the mains frequency.

Claims (3)

1. Multiphase rectifier consisting of a three-phase transformer with two secondary windings, valves connected by anodes to the output of the secondary windings and forming rectifiers with middle points, and filter chokes, characterized in that in order to reduce the volume and weight of the outputs Each mitele, each rectifier is connected to the load through its own choke filter a. 2. Selected by. I, characterized in that it is made in the form of two three-phase 5 straighteners with midpoint. 3. The exchanger according to claim I, of which is made in the form of three two-half-right rectifiers with middle points. Sources of information accepted in the examination for the expertise: 1. “Semiconductor Rectifiers, Ed. F. I. Kovalev and G. G. Mostkova, ed. “Energie, 1967, p. . 2.G. S. Veksler, Ya. I. Tetelbaum, “Electrical Power of Radio Devices,” ed. "Equipment, Kiev, 1964, p. 184-186. I 4-L. ,