SU1471264A1 - High-voltage single-ended dc voltage converter - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in the sources of secondary power supply systems of radio engineering, automation and computer technology. The goal is to expand the range of output voltage regulation. The device contains a key transistor 1, the collector circuit of which includes the primary winding 2 of the transformer 3, the secondary winding of which 4 is connected via a high voltage rectifier with filter 5 to the output terminals. The recovery winding 6, wound around the primary winding 2, is connected via diode 7 in parallel to the capacitor 8. Such inclusion of the recovery winding 6 allows, at any duty cycle of the control signals, to output the energy accumulated in the primary winding 2 of the transformer 3 into the load circuit and thereby expands output voltage control range. 3 hp ff. 3 il.

Description

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1

The invention relates to the field of electrical engineering and can be used in the sources of secondary power supply systems of radio engineering, automation and computer technology.

The aim of the invention is to expand the range of output voltage regulation,

Figures 1 and 2 show an electrical high-voltage one-turn converter circuit with a rectifier made according to a doubling scheme and a cut-out circuit performed according to an asymmetrical multiplication circuit of the output voltage of the secondary side of the transformer transformer; in fig. 3 shows time diagrams of the voltage and on the collector of the key transistor.

The high-voltage single-ended converter contains a key transistor 1, the collector circuit of which includes the primary winding 2, the transformer 3, the secondary winding circuit 4 of which is connected via a high-voltage terminator with a filter 5 to the output terminals, a rectifier winding 6, a diode 7 and a capacitor eight.

The device works as follows.

When transistor 1 is opened, the energy through the transformer 3 and the rectifier with filter 5 is supplied to the output outputs.

At the same time, energy is stored in the magnetic field of the transformer 3. When the transistor 1 is locked, a part of the energy associated with the secondary winding 4 enters through the top of the motor into the filter capacitors. Another part of the energy connected to the primary winding 2 cannot be brought out of the winding 4. However, due to the large coupling coefficient of the windings 2 and 6 wound bifillary, part of the energy connected to the primary winding 2 enters through diode 7 the capacitor 8. The discharge of the capacitor 8 is provided by the passage of a load current through the lower one (Fig. 1). Switching the output of one of the diodes of the doubling circuit to the junction point of diode 7 and capacitor 8 and (points A and B of Fig. 1) allows the charge current of the capacitor to flow through the capacitor 8 to the doubling circuit during the open state of the key transistor 1, which allows locking

key transistor 1 reduce

slew rate

 his collection1) e. In the diagram in FIG. 2

during the open state of the key transistor 1, the diode 7 is closed, the winding 6 turns out to be connected in series with the winding 4 and the voltage on the winding 6 decreases simultaneously with the voltage on the winding 4. In addition, the current of the windings passes fully in the half-open state of transistor 1 through the capacitor 8 and completely discharges it, which makes it possible to further reduce the amount of dynamic power released by transistor 1 when it is turned off. On whig. 3 shows charts

0 voltage on the collector of transistor 1 in the absence of winding 6 (diagram 9) when connecting the capacitor 8 in series with the filter (diagram 10) and when reducing the dynamic power (diagram 11).

Thus, switching on the recuperative L 6 winding through the diode 7 in parallel with the capacitor 8 connected in series with the filter 5 allows 0 bt, by varying over a wide range the duty ratio of the control signal of the key {transistor 1, to ensure the operation of the high-voltage converter while maintaining the output characteristics.

five

Claims (4)

1. High Voltage Single-ended a constant-voltage converter containing connected to the input terminals, a series-connected key transistor and the primary winding of the transformer, the secondary circuit of which is connected to the input of a diode-capacitor voltage multiplier node, the output of which is connected to the output outputs, wound bifil with primary winding, a diode cut-off and a storage capacitor, characterized in that, in order to extend the range of output voltage regulation, The recovery winding is connected through a cut-off diode parallel to a capacitive capacitor included in the diode-capacitor voltage multiplier unit. 2. The converter according to claim 1, which is characterized by the fact that the diode-capacitor voltage multiplication unit is made in the form of a symmetric doubling circuit, the capacitors of which are connected in series with the storage capacitor to the output terminals. 3. A converter according to claim 1, characterized in that the diode-capacitor multiplication unit of the voltage is fulfilled in the form of a symmetric doubling circuit, wherein the storage capacitor forms with one of srig.Z diodes; symmetric doubling circuit; serial circuit. 4. The converter according to claim 1, characterized in that the diode-capacitor voltage multiplication unit is made according to an asymmetrical multiplication circuit, wherein the cut-off diode is connected in series with the first winding of the transformer in series with the first diode of the asymmetrical voltage multiplication circuit, the storage capacitor is connected in series with the output terminals: capacitors of the asymmetric voltage multiplication circuit to the output terminals.