SU1690125A1 - Dc voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary power supply systems. The purpose of the invention is to improve the quality of the output voltage by reducing the ripple factor. The converter contains two groups of m single-ended cells each. , Each single-ended cell (with) consists of a transformer with primary winding 1.1 (2.1, 3.1 and 4.1), secondary winding 1.2

Description

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

The purpose of the invention is to improve the quality of the output voltage by reducing the ripple factor.

The invention is illustrated in the diagram shown in Fig. 1 and in the time diagrams in Figures 2 and 3; 4 shows an embodiment of a multi-phase modulator.

The converter (figure 1) contains 2 tons, for example, four single-ended cells 1 ... 4 with primary 1.1 (2.1; 3.1; 4.1), secondary 1.2 (2.2; 3.2; 4.2) windings of the transformer, transistor switch 1.3 (2.3; 3.3; 4.3), recovery diodes 1.4 (2.4; 3.4; 4.4) and

a rectifying diode 1.5 (2.5; 3.5; 4.5) in the secondary winding 1.2 (2.2; 3.2; 4.2) in each cell. The beginnings of primary windings 1.1, 2.1 of the first group of two cells 1.2 are connected to the first input terminal 5 of the converter via the keys 1.3, 2.3, and to the other input terminal 6 via the recuperation circuits 1.4, 2.4. In the second group of cells 3.4 the ends of the primary windings 3.1, 4.1 are connected to the first input terminal 5 through the recovery circuits 3.4, 4.4, and to the other input terminal 6 - through the keys 3.3, 4.3. The secondary windings 1.2,2.2,3.2,4.2 are connected through the corresponding rectifying diodes 1.5, 2.5, 3.5, 4.5 and the output capacitor 7 to the output pins 8, 9 of the converter. In addition, the device

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contains. A 2t-phase (four-phase) modulator 10 with two informational 11, 12 inputs, one of which 11 modulates the pulse durations, and the other 12 modulates the frequency of these pulses. The phase-related outputs a and b, c and d of the modulator 10 are connected to the control inputs of transistors 1,3 and 3.3, 2.3 and 4.3, respectively. The ends of the primary windings 1.1, 2.1 of the first group of 1.2 cells and the beginning of the primary windings 3.1, 4.1 of the second group of 3.4 cells are connected to the common nodes 13,14, between which the filter choke 15 is inserted. The transformers of the cells are electrically or magnetically connected between themselves in a multi-phase system. To the input terminals 5, 6 is connected to the capacitor 16.

Figure 2 shows the timing diagrams of the modulation power supply while regulating the input voltage only at the information input 11 of the modulator 10, here indicated: 17 - fixed-frequency clock; 18 ... 21 - key control pulses from the outputs of the four-phase phase modulator a, b, c, d; 22 - the form of pulses at the input of the filter 7.

Fig. 3 shows diagrams for regulating the input voltage at the second information input 12 of the modulator 10, here indicated: 23 — adjustable frequency clock pulses; 24 ... 27 - key control pulses with a fixed duration of the four-phase phase modulator a, b, c, d; 28 - the form of pulses at the input of the filter 7.

The modulator 10 can be performed, for example, according to the scheme shown in Fig. 4, where: 29 is a controlled pulse generator (HI), 30 is a pulse distributor (RI), 31 is a MDI pulse width modulator for the corresponding phase a , B, c, d. Information entry. 11 is intended to control the pulse duration 18-21 (Fig. 2), and input 12 receives information proportional to which the frequency of the generator of the GI pulses and key control pulses 24-27 (Fig. 3) changes.

Cell transformers form a multi-phase system by serially connecting additional windings, or a volumetric coil, or a branched multi-phase magnetic system into a ring.

The modulation power supply can operate in three modes. In the first mode, the output voltage is controlled using a multi-phase latitude

but-pulse modulation MSIC (figure 2). In the second mode, the regulation is carried out with the help of multiphase frequency-modulated modulation of the MCIC. In third

mode regulate together using MSHIM and MCHIM.

Suppose that information input 11 receives a control action in the form of a slowly increasing voltage, which changes the duration of the pulses 18–21 (FIG. 2) from Chemistry to tw max proportional to the magnitude of this effect. Until time ti, keys 1.3–4.3 open alternately and there is no situation

5 when two keys from the first 1.2 and second 3.4 cell groups would be open at the same time, therefore, there is no circuit for the discharge current flowing to the capacitor 16. On the load there is a zero voltage level.

0In the time interval between tt and v.2, pulses 18, 19 (Fig. 2) simultaneously open the keys 1,3 and 3.3. From pin 5, the current flows through the circuit: key 1.3, winding 1.1, filter choke 15, winding 3.1,

5 key 3.3, pin 6, and since current flows through the primary windings, an emf is induced on the secondary winding, which recharges capacitor 7. A choke is inserted through the keys to eliminate current surges through the keys. With a large duration of control pulses a longer duration is formed voltage (current). When y (t., 5 in the output voltage - the maximum level. In the presence of four cells, the frequency

5 pulsations 4 times more than in one cell. An increase in the number of cells above the specified number increases the number of pulsations, while at the same time new control zones are created, similar to the first

0, in the region shown in FIG. 2, i.e. a multi-zone control effect appears. The use of the proposed scheme allows, with an equal number of diodes and keys in the primary circuit, to double the frequency

5 quantization in comparison with the converter made by the bridge circuit, the control range of the control pulse duration is reduced in a specific example by two times, which increases

0 system gain. The secondary windings of the transformer can be included with both direct switching of the diodes and reverse.

Similarly (FIG. 3), the regulation is carried out with multiphase frequency-pulse modulation. Given the regulation method in the proposed power circuit, for example, with four cells, the output voltage is regulated to all & when the frequency of the control pulses 24–27 (Fig. 3) is changed only twice.

In cases where it is necessary to carry out amplitude modulation and stabilize the average voltage level, these functions can be divided into two circuits, for example, the modulating effect should be fed to input 11, and the average level should be stabilized through the frequency control circuit (input 12 ) using negative feedback. Two information inputs allow to stabilize the power by organizing voltage and current feedbacks,

Figure 4 shows, for example, a 2t-phase modulator circuit 10, in which the HI generates a clock sequence of pulses 17 (Fig. 2) or 23 (Fig. 3). The PSI distributes them in phases, the MDI is generated by key control pulses, the duration of which is determined by the magnitude of the signal at input 11.

Claims (1)

Invention Formula A constant voltage converter containing 2 tons of single-ended cells, each of which consists of a transformer, a transistor switch, a regenerative diode and a rectifying diode, the secondary winding of the transformer of each single-cycle cell through a rectifying diode connected to the output pins of the converter shunt 0 five 0 five 0 At the end of the first filter, the primary winding of each transformer from the first group, consisting of single-ended hp cells, is initially connected via a transistor switch to the first input terminal of the converter and, via a regeneration diode, to the second input terminal of the converter, and the winding of each transformer of the second group is of the single-ended cells, the end is connected via a transistor switch to the second input terminal of the inverter h through a regenerative diode — to the first input terminal of the transducer, and auschu v, and so, with the aim of poaching the quality of the output voltage, the ratio of ripples was reduced ;: the ends of the primary and motor transformers of the first group of single-stroke cells and the beginnings of the primary windings of the transformers of the second group of single-cycle cells were combined into two common the points between which the inserted filter choke is connected, and the control circuits of the transistor switches are connected to the outputs of the m-phase modulator inserted into the control unit 2, and the outputs of its adjacent phases are connected to the control circuits of the transistor switches note cells belonging to different groups, one of the inputs is designed to modulate the frequency, and the other is the duration of the pulses. / 2 9 1 o  J2 Phage.1 but d 17 18 W go 11 and Fig 2 Z3 24 25 26 11 28 (Bit