SU1317598A1 - One-step d.c.voltage converter - Google Patents

Abstract

The invention is used in sources of secondary electrical power equipment. The purpose of the invention is to improve the mass-dimensional parameters of the converter. The converter contains two one-stroke inverter cells 1,2, each of which consists of windings 5

Description

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The invention relates to converter equipment and is intended for use in sources of secondary power supply for electronic equipment.

The purpose of the invention is to improve the overall dimensions of the converter.

Fig. 1 shows a functional diagram of a stabilized one-stroke DC / DC converter; figure 2 - timing charts of his work.

The converter contains two one-stroke inverter cells 1 and 2 connected to the input terminals. The cells contain control transistors 3 and 4 connected to the primary windings 5 and 6 of transformers 7 and 8, secondary windings 9 and 10 connected via rectifying diodes 11 and 12 to the input of a common LCD filter 13, to the output of which is connected 14 and an input pulse-width modulator 15. A capacitor 16 connected to opposite electrodes of rectifying diodes 11 and 12 is included in the diagonal of a bridge formed by secondary windings 9 and 10 and rectifying diodes 11 and 12 shunted by the first 17 and second 18 transistors counter wire bridge. The diode 19 of the LCD filter 13 is shunted by a third counter-conducting transistor 20. The control electrodes of the control transistors 3 and 4 are connected via a pulse distributor 21 to the output of a pulse-width modulator 15, and control 1e inputs of transistors 17, 18 and 20 are connected to the output of a pulse-width modulator 15. 11, 12, and 19, and transistors 17, 18, and 20 form two-way conduction keys.

The single-ended DC-DC converter works as follows.

The distributor 21 and shaper 22 produce a sequence of control pulses of transistors 3 (Fig.26), 4 (Fig.2b), 17 (Fig.2g), 18 (Fig.2d) and 20 (Fig.2e), synchronized with the pulses pulse modulator 15 (figa). If there is unlocking voltage on the control electrodes of the control transistor 3 (Fig. 2b) and trans. 2

The resistor 18 (FIG. 2d) is open, the voltage of the power supply is applied to the winding 5 of the transformer 7, under the action of which the transformer magnetizing current leads to the secondary winding (dotted line in FIG. 2i) and the winding 9 is applied. Through A double-sided conduction key consisting of a diode 12 (fig. 2m) and a transistor 18 (fig. 2o) flows through the difference in the currents of the throttle (fig. 2g) and the magnetization of the transformer 8 (fig. 2i), which closes through the capacitor 16 (fig. 2k). At the end of the trigger pulses, the control transistor 3 and the transistor 18 are closed and the transistors 17 (FIG. 2 d) and 20 (FIG. 2 (e)) are turned on. Under the action of the self-induced EMF of the transformer 7, the diode 12 (Fig. 2m) is closed and the throttle current HC1) filter 13 is closed through a double conduction switch consisting of a diode 19 and a transistor 20.

Transformer magnetizing current

7, decay, closes the circuit: winding 9 - capacitor 16 - diode II or transistor 17. The winding 10 of the transformer 8 is shorted

the diode 1 1 and the transistor 20, therefore, the magnetizing current of the transformer 8 varies slightly (Fig. 2i). Through the key 11, 17 of the double-sided conductivity (Fig. 2l, h), the lock closes.

the magnitude of the magnetizing currents of transformers 7 and 8, and through the switch 19, 20 - the difference between the current level of the LCD filter and the magnetization current of the transformer

8. Further, the transistor 20 is turned off and the transistor 4 is turned on. The throttle current of the LCp filter 13 is closed through a two-way switch 11, 17 (FIG. 2 l, n), which also passes the magnetizing current of the transformer 7.

I

After turning off the transistors 4

and 17 include transistors 18 and 20 (Fig. 2e, d). In this case, the winding is shorted through the keys 12, 18 and 19, 20

9 of transformer 7 (FIG. 2z), and a voltage of capacitor 16 is applied to the winding 10 of transformer 8 via a switch 12, 18. Consequently, a voltage of capacitor 16 is applied to each of the secondary windings of transformers of inverter cells during a half-cycle of switching frequency. capacitor current equal to each half cycle current

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magnetization of the corresponding winding, has a zero, average value that provides a two-pole change in induction in the cores of transformers. When the throttle current exceeds the amplitude of the magnetizing current, the necessity of shunting the diodes of the converter by back-conducting transistors is eliminated, which greatly simplifies the circuit of the converter.

Thus, the introduction of a capacitor included in the diagonal of the bridge formed by the secondary windings of transformers and rectifying diodes, and the shunting of the output diodes and the filter diode by back-conducting transistors make it possible to reversal the transducer cores of the transformers across a symmetric full cycle. This makes it possible to count transformers at twice the 2BJ induction span.

Ph o rmula of the invention

A single-ended DC-DC converter containing two single-ended inverter cells connected to the input terminals, each

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of which contains the primary winding of the transformer connected to the regulating transistor, the control electrodes of which through the common for both cells pulse distributor are connected to the output of the pulse-width modulator, the secondary winding of the transformer connected through a rectifying diode to the input 0 common for both cells An LCD filter whose output forms output pins to which an input of a pulse-width modulator is connected, characterized in that, with 5 goals to improve the weight and size parameters of the converter , a pulse shaper, a capacitor included in the diagonal of the bridge formed by the secondary windings 0 of transformers and rectifying diodes are inserted into it, with the capacitor leads connected to opposite electrodes of the rectifying diodes, and the rectifying diodes and the LBB filter 25 diode are shunted by counter-conductor transistors, control electrodes of which are connected to the outputs of the pulse former associated with the output of the pulse-width converter.

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Compiled by I.Nikitin Editor A.Ogar Tehred M.Hodanich Proofreader T.Kolb

Order 2A31 / 52

Circulation 660 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

SUMMARY OF THE INVENTION A single-cycle DC-DC converter comprising two single-cycle inverter cells connected to the input terminals, each of the conductivity, the control electrodes of which are connected to the outputs of the pulse shaper associated with the output of the pulse-width converter 30.