SU1275690A1 - One-step d.c.voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary sources of electrical, tannin. The purpose of the invention is to improve the overall dimensions. The converter contains a controllable key 1, a transformer (Tr) 4 with windings 2 and 7, Tr 5 with windings 10 and 11. The introduction of rectifying diodes 12 and 13 and connecting them to the filter 9 provides a continuous flow of energy to the load both with the open and the and when the key is closed, thanks to the same transformation ratios Tp 4 and section 10 Tp 5, the charging currents of capacitive fi.pra 9 are equal to each other at all stages of the key 1. The inductance of the winding 2 decreases, the magnetization reversal by a stable voltage and demagnetization in the load allowed It makes efficient use of Tp 4 and Tp 5. 1 Cp. f-ly, 1 ill. (L

Description

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The invention relates to electrical engineering and can be used in secondary power sources.

The purpose of the invention is to improve the maesogabarious indicators.

The drawing is a schematic of a single-ended DC / DC converter.

The converter contains a controlled switch 1 connected in series with the primary windings 2 and 3 of the first 4 and second 5 transformers respectively. The control unit 6 is connected to the input of the key 1. The secondary winding 7 of the transformer 4 is connected via diode 8 to the output capacitive filter 9. The secondary winding of the transformer 5 is made of two sections 10 and 11 and is connected to the filter 9 through a semi-period rectifier diodes 12 and 13.

The converter works as followsP | im image.1

The control unit generates a sequence of pulses controlling the operation of key 1. When the key is open 1, the voltage of the power source is applied to the primary windings

2 and 3 transformers 4 and 5. In this case, the diode 8 is closed by reverse voltage and energy is stored in transformer 4. The magnetizing current of the transformer 4, the passage through the primary winding 3 of the transformer 5, is transformed into section 10 and through diode 12 enters the load. At the stage of the closed state of the key 1, the energy accumulated in the transformer 4, through the diode 8 is transferred to the load. Transformer 5 is demagnetized through diode 13 also into a load. Thus, the current is supplied to the load continuously, both when the key 1 is open and closed, thanks to the same transformation ratios of the transformer 4 and sections 10 of the transformer 5, the charging current of the capacitive filter 9 during the open and closed states of the key 1 equal to each other. All this contributes to: the trenching of the dimensions of the filter 9 in

3-5 times in comparison with the known converter,

The dimensions of the entire transformer unit (transformers 4 and 5) in the proposed device are approximately 2030% less than in the known, due to

reducing the value of the inductance of the winding 2 and due to the effective use of the transformer 5, the momentum is re-magnetized by a stable voltage and demagnetized into a load.

It should be noted that the core of the transformer 4 is chosen with low magnetic permeability, and the core of the transformer 5 is chosen with high. In this case, the transformer 4 can be considered as a two-winding choke, and the transformer 5 - as a current transformer.

Proceeding from the equality of volt-second areas at the stages of closed t and open t states of key 1 for the primary winding 2 of transformer 4, the equality (Е and „n) t, U t,, where Е is the supply voltage j

n is the transformation ratio of the transformer 4,

n - transformation ratio

section 10 of the transformer 5. Denoting t.yT, tg (1-S () T, where T is the switching period of key 1,

 - pulse duration,

we have and

while

n p + Kp,)

p, n, p

nn

It can also be shown that the minimum effective current through the filter capacitor 9 and the minimum dimensions of transformers 4 and 5 are achieved with equality,

Claims (2)

1. Single-phase DC-DC converter containing a controllable key, in series with which the primary windings of the first and second transformers are included, the control unit, the secondary winding of the first transformer is connected to the output capacitive phase through a diode connected to the phase-conductive key, the secondary winding of the second The transformer is made in the form of two sections, characterized in that, in order to improve the weight and size parameters, the secondary winding of the second transformer through the den31275690. four The full-wavelength rectifier transforms the transformation effect from one of the connected to the specified filter. sections of the secondary winding of the second 2. The converter according to claim 1, about t - the transformations of the first transformer — and that the ratio of the transformer is equal to the coefficient