SU1270848A1 - One-step d.c.voltage converter - Google Patents

Abstract

The invention relates to electrical electronics and can be used in secondary power supply systems for converting a constant voltage level. The aim of the invention is to increase efficiency. The device contains a power transistor 11, through two sections of the primary winding of the transformer 3 connected to the input terminals. The demagnetizing winding 14 is connected to the output terminals. Each of sections 4 and 5 is shunted together with diode 8, capacitors 9, 10, with rechargeable winding currents 4 and 5 up to half the input voltage on each of them. The reloading of capacitors, limiting the rate of voltage buildup on the key, is carried out through the choke (the primary winding of the transformer), i.e. practically without loss, but when the key is opened (a voltage jump on it is excluded. 1 ill. / J 12. s 1 o 00 4 00 1 -th

Description

UNION OF ADVISORS

SOCIALIST

REPUBLIC „SU„ „1270848 A1

USSR STATE NOMINATION FOR CASES OF INVENTIONS AND OPENINGS

DESCRIPTION OF THE INVENTION

N AUTHOR'S CERTIFICATE

ALL-Union (21) 3854742 / 24-07 (22) 02/12/85 (46) 11/15/86. Bull. No. 42 (71) Experimental production and technical enterprise Uralchermetavtomatika (72) O.N. Melnikov and D.0. Melnikov (53) 621.314.58 (088.8) (56) US patent No. 3115600, cl. 323-22,1963.

USSR copyright certificate No. 1035756, cl. H 02 M 7/537, 1982.

(54) SINGLE-STAGE DC-CONVERTER (57) The invention relates to electrical engineering and can be used in secondary power supply systems for converting a constant voltage level. The aim of the invention is to increase efficiency. The device contains a power transistor. 11, through two sections of the primary winding of the transformer 3 connected to the input terminals. The demagnetizing winding 14 is connected to the output terminals. Each of sections 4 and 5 is shunted together with diode 8 by capacitors 9, 10, recharging currents of windings 4 and 5 to half the input voltage on each of them. The recharging of capacitors that limit the rate of rise of the voltage across the key is carried out through the inductor (primary winding of the transformer), i.e. almost lossless, but when the key is opened, a power surge on it is completely eliminated. 1 ill.

Invention; relates to electrical engineering and can be used in secondary power systems to convert the level of constant voltage.

The purpose of the invention is improving efficiency.

·· The drawing shows the electrical circuit of the proposed Converter. ·

Input terminals 1 and 2 of converter 1 are used to connect a power source. The transformer 3 has a primary winding made of two sections 4 and 5, a demagnetizing winding 6 and a secondary winding 7. Sections 4 1 and 5 of the primary winding of the transformer 3 are connected in series through a diode 8 and each are connected to this diode through capacitors 9 and 10, respectively. the output of section 5 2 is connected through a power transistor 11 to the input terminal 1. The secondary winding through a rectifier 12 and the output LCD filter 13 is connected to the output terminals. The demagnetizing winding 6 ² with a series-connected diode 14 is connected to the output terminals.

The device in steady state operates as follows.

With the switch 11 open and 3 transients completed, each of the capacitors 9 and 10 is charged to a voltage U _c in the polarity locking for diode 8.

When the key 11 is closed, voltage U _BX + U _c is applied to each of the sections 4 and 5, and the branches formed by the capacitor 9 with section 5 and the capacitor 10 with section 4 are connected in parallel. 4 Capacitors 9 and 10 are recharged by the current of windings 4 and 5 to half the input voltage on each of them. Starting from this moment, diode 8 opens, the voltage at each of the capacitors 4: the saturators 9 and 10 is fixed at this level. Sections 4 and 5 of the primary winding of the transformer 3 are connected in series, and the current of the windings continues to increase. The process of energy storage in the throttle of the LCD filter continues.

When the key 11 is opened, the current of the series-connected sections 4 and 5 through the open diode 8 is shunted to j, the series-connected capacitors 9 and 10, and the voltage on the key rises at a speed determined by ₍ the charge rate of these capacitors.

When the transformer reaches the reduced demagnetization voltage, the transformer begins to discharge into the load through the opened diode 14. After the demagnetization of the transformer is completed, the voltage across it abruptly drops to zero; the device returns to its initial state and is ready for the next cycle of work.

Thus, according to the proposed solution, the recharging of capacitors that limit the rate of rise of the voltage across the key is carried out through the inductor (primary winding of the transformers), i.e. almost lossless, but when the key is opened, a power surge on it is completely eliminated, which significantly reduces the loss in the key.

Claims (1)

Claim A single-ended DC-voltage converter containing a power transistor connected by a first power electrode to the first input terminal of the converter, a transformer whose primary winding is connected by a first terminal to the second input terminal of the converter, the secondary winding through the rectifier and the output LCD filter is connected to the output terminals of the converter, and the demagnetizing the winding through the first diode is connected to the output or input terminals of the converter, the second diode and the first capacitor to reduce the dyne losses, characterized in that, in order to increase the efficiency, a second capacitor is introduced into it, the second terminal of the transformer primary winding is connected to the second power electrode of the transistor, and the primary winding is divided into two identical sections, with the first capacitor between the ends of the sections, between the ends sections, a second capacitor is connected, and between the end of the first section and the beginning of the second section, a second diode is connected in the direction of conductivity, consistent with the conductivity of the power transistor. VNIIIPI. Order 6250/55 Circulation 631 _________ Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4