CN205354827U - Three single -phase pulse wave rectifier transformer - Google Patents

Abstract

The utility model provides a three single -phase pulse wave rectifier transformer that can alternate into three pulse wave alternating currents with the single phase alternating current electricity, it comprises a primary coil and three secondary winding and three post iron cores that have two short circuit rings, lay two short circuit rings on the stem stem of iron core both sides, the short circuit ring produces induced current when the magnetic flow process, the synthetic magnetic flow that passes through in the iron core post according to this induced electricity conductance system of lenz law lags behind, the hysteresis is relevant with the area that the short circuit ring surrounded, make the also corresponding hysteresis of current potential phase place of the secondary winding response of cover on the iron core post of both sides, the final current potential output of inducting that forms three different phase places in three secondary coil.

Description

A single-phase three-pulse rectifier transformer

technical field

The utility model relates to the technical field of converting single-phase alternating current into direct current, in particular to a rectifying transformer applied to a single-phase relatively large-power rectifying power supply.

Background technique

Most of the current occasions that require DC power use AC rectification to obtain DC power. In high-power occasions, a three-phase AC power supply is generally converted by a multi-pulse rectifier transformer and then rectified to obtain a high-quality DC power supply. However, in some small and medium power occasions, since there is no three-phase AC power supply, only single-phase AC power rectification can be used to obtain DC power. power supply. my country's power grid uses 50Hz sinusoidal alternating current for power supply. After rectification, 100Hz direct current pulsating current is obtained. The current pulsating component is large, and the pulsating coefficient is as high as 47%, which has the disadvantages of large harmonic interference and low power factor. Actual use requires large-capacity capacitors for filtering, voltage stabilization and other measures to meet the needs of electronic equipment. However, there are still many technical problems in the manufacture of large-capacity and high-voltage capacitors that are difficult to overcome, and the manufacturing cost of power supplies is relatively high.

Compared with the single-phase power supply, the DC power obtained after rectification of the three-phase power supply is much better. First, the three-phase AC power obtained after rectification is a 300Hz DC pulsating current, and its current pulsation component is much smaller than that obtained after single-phase rectification. For the obtained pulsating current, the pulsation coefficient of the DC current after three-phase rectification is only 18.27%. Since the pulsation coefficient is small, the subsequent rectification and filter circuits are relatively simple.

Contents of the invention

The utility model provides a rectifier transformer capable of transforming single-phase alternating current into three-pulse alternating current, which outputs three-pulse alternating current after being transformed by the transformer, and then rectifies to obtain a 300Hz direct current pulsating current, thereby obtaining a relatively stable pulsating current, greatly It reduces the harmonic interference of the power supply, improves the power factor of the power conversion circuit, etc., so as to help the subsequent circuit simplify filtering, voltage stabilization and other links, and reduce the cost of obtaining DC power.

The technical solution adopted by the utility model to solve the technical problems is a power transformer capable of transforming single-phase alternating current into three-pulse alternating current. The coil is composed of three secondary coils and two short-circuit rings respectively installed on the core columns on both sides of the iron core. Its basic feature is that there is a short circuit on the two iron core columns on both sides of the three iron core columns. Ring grooves, each of which is equipped with a short-circuit ring, the cross-sectional area of the iron core surrounded by one of the short-circuit rings is one-third of the cross-sectional area of the column core, and the cross-sectional area of the iron core surrounded by the other short-circuit ring is one-third of the column core. Two-thirds of the cross-sectional area of the core, one secondary coil is placed on each of the three iron core columns, the primary coil is placed on the middle core column, and the three secondary coils are connected to form a star or triangle to output three pulse currents. As shown in Figure 1.

When the primary side coil is fed with single-phase alternating current, a corresponding alternating magnetic flux will be generated in the iron core according to Oerster's law. magnetic circuit. According to Faraday's law of electromagnetic induction, an induced electromotive force will be generated in the secondary coil 5 set on the middle column. An induced current is generated in the ring, and according to Lenz's law, the magnetic flux generated by the induced current will resist the change of the original magnetic flux, and guide the hysteresis of the synthetic magnetic flux passing through the iron core column. The hysteresis is related to the area surrounded by the short-circuit ring , the hysteresis is also large when the enclosing area is large, so the phases of the actual magnetic flux passing through the two iron core columns are respectively lagging behind the phase of the magnetic flux in the middle iron core column by a corresponding angle. The phase of the electric potential induced by the coil also lags accordingly, and the phase of the electric potential induced on the coil is also different in the area surrounded by the two short-circuit rings of the two stems. Finally, three induced electric potential outputs with different phases are formed in the three secondary coils. Different output voltages are obtained by adjusting the turns ratio of the secondary coil and the primary coil to meet the needs of actual use.

The advantages and benefits of the utility model are that in the case of ordinary single-phase power supply, three-pulse alternating current can be obtained after conversion, and the ripple coefficient of pulsating direct current obtained after rectification of three-pulse alternating current is low, harmonic The wave interference is small, greatly reducing the capacity of the energy storage capacitor in the subsequent filter circuit, thus simplifying the rectification and voltage stabilization circuit, and reducing the cost of obtaining DC power in single-phase power supply occasions, especially suitable for small and medium power DC power supplies with single-phase power supply.

Description of drawings

Accompanying drawing 1 is the structural representation of the present utility model, and 1 is transformer iron core, and 2 is the primary side coil that is enclosed within on the middle iron core post, and 3 and 7 are two short-circuit rings that are enclosed within on both sides iron core posts, 4, 5 and 6 are three secondary side coils;

Accompanying drawing 2 is the structural schematic diagram of the iron core punching sheet of the utility model, and it is made up of two E-shaped punching sheets to form an iron core, and a groove 9 for placing a short-circuit ring is respectively punched on the iron core posts on both sides of one of the punching sheets 8 and 10;

Accompanying drawing 3 is the three-dimensional iron core structural schematic diagram after stacking the iron core and placing two short-circuit rings.

detailed description

The first step is to punch out the iron core prefabricated sheet with short-circuit groove as shown in Figure 2 with silicon steel plate; the second step is to wind the primary and secondary coils with different turns according to the required voltage and power; the third step is to make the iron core The core prefabricated sheet is inserted into the inner holes of the four coils and laminated to form an iron core, and finally forms a complete transformer; the three secondary coils are connected to form a star or delta circuit to output three pulse currents to the subsequent three-phase rectifier circuit. After rectification, a relatively stable DC power supply is obtained.

Claims (1)

1. single-phase three pulse wave rectifier transformators, the three-limb core that it is pressed into by the silicon steel sheet stack of punching in advance, three secondary coils of one primary coil and two short-circuited conducting sleeve compositions being separately mounted on the stem stem of iron core both sides, its basic feature is to be positioned in two iron core column of both sides in three iron core column respectively to have a short-circuit annular groove, groove is respectively provided with a short-circuited conducting sleeve, the iron core transverse sectional area that one of them short-circuited conducting sleeve surrounds is 1/3rd of post core cross-sectional area, the iron core transverse sectional area that another short-circuited conducting sleeve surrounds is 2/3rds of post core cross-sectional area, three iron core column are respectively laid a secondary coil, primary coil is placed in center pinch, three secondary coils are connected into star or triangle exports three pulse current.