SU571862A1

SU571862A1 - Ac to dc converting method

Info

Publication number: SU571862A1
Application number: SU7602319626A
Authority: SU
Inventors: Лев Моисеевич Браславский; Александр Михайлович Сажнев; Валерий Григорьевич Кобылянский; Валерий Вячеславович Дуркин
Original assignee: Новосибирский электротехнический институт
Priority date: 1976-02-04
Filing date: 1976-02-04
Publication date: 1977-09-05

Description

(54) СПОСОБ ПРЕОБРАЗОВАНИЯ ПЕРЕМЕННОГО НАПРЯЖЕНИЯ В ПОСТОЯННОЕ(54) METHOD FOR CONVERSION OF VOLTAGE VOLTAGE TO PERMANENT

1one

Предлагаемое изобретение относитс к области преобразовательной техники и может быть использовано в источниках электропитани радиоэлектронной аппаратуры.. The present invention relates to the field of converter technology and can be used in power supplies for electronic equipment ..

Известны различные способы преобразовани переменного напр жени в посто нное 1-5 .Various methods are known for converting a variable voltage to a constant 1-5.

Основным недостатком известных способов вл етс то, что крутизна регулировочной характеристики устройс реализующих эти способы, мала (под крутизной регулировочной характеристики понимаетс отношение изменени выходного напр жени к изменению зар да конденсаторов) , она нелинейна и, кроме того, при изменении входного напр жени выходное измен етс в пр мой пропорции, т.е. вл етс нестабилизированным. Первые два недостатка определ ютс тем, что при зар де конденсаторов от сети череТ преобразователь рода тока ток зар да измен етс по сложному закону, состо щему из гармонической и экспонеНциаль ной составл мш1нх (при пульсирующем напр жении на выходе преобразовател рода тока) или из экспоненциальной составл ющей (при посто нном напр жении на выходе преобразовател рода The main disadvantage of the known methods is that the steepness of the regulating characteristic of devices implementing these methods is small (the steepness of the regulating characteristic means the ratio of the change in the output voltage to the change in the charge of the capacitors), it is nonlinear and, in addition, the output voltage varies with the input voltage is in direct proportion, i.e. is unstabilized. The first two drawbacks are determined by the fact that when charging capacitors from a network over a transducer of the type of current, the charging current changes according to a complex law consisting of the harmonic and exponential components msh1nh (with a pulsating voltage at the output of the current type converter) or exponential component (at a constant voltage at the output of the converter of the genus

тока). По таким же законам измен етс напр жение на конденсаторах. Следовательно , при регулирований выходного напр жени путем изменени времени зар да регулировочна характеристика будет нелинейна, а ее крутизна - малаcurrent). According to the same laws, the voltage on the capacitors changes. Therefore, when adjusting the output voltage by changing the charging time, the control characteristic will be non-linear, and its slope will be small.

Прототипом предлагаемого способа вл етс способ преобразовани переменного напр жени в посто нное путем изменени рода тока с последующим циклическим последовательным зар дом п. конденсаторов и параллельным их разр дом на нагрузку ilj .The prototype of the proposed method is a method of converting an alternating voltage into a constant by changing the type of current followed by cyclically sequential charging of n capacitors and parallel to their discharge to the load ilj.

По предлагаемому способу с целью увеличени крутизны регулировочной характеристики, обеспечени ее линейности и стибилизации .выходного напр жни при изменении входного, ток зар ца конденсатора формируют в виде пр моугольного импульса.According to the proposed method, in order to increase the steepness of the adjustment characteristic, ensure its linearity and stabilize the output voltage when the input voltage changes, the charge current of the capacitor is formed in the form of a rectangular pulse.

На фиг.1 приведено одно из возможных устройств, реализующих предлагаемый способ; на фиг. 2 - диаграг-в-аа, по сн ющие способ.Figure 1 shows one of the possible devices that implement the proposed method; in fig. 2 - diag-on-aa, explaining the method.

Claims

The device is made of a transformer: kind of current 1 (system of valves ON, single-phase MQCT). controlled keys 2 and 3 (respectively K and K), accumulation scheme-division 4 (SND), forma l pulse of charge current 5 (FIT), smoothing filter 6, control (SU) 7 by keys 2 and 3, load 8 converter SND4 consists of n capacitors 9, (n -1) charge diodes 10, and discharge uncontrollable valves 11 and 12. Each capacitor 9 is connected to the anode of valve 11 by one end and the cathode of 12 to the other end. The connected elements 11, 9 and 12 form one of the n chains of the circuit 4. Each subsequent chain is connected to the previous valve 10, the anode of which is connected to the junction point of the capacitor 9 with the cathode of the valve C of the next chain. The anodes of the valves 12 are connected together and via a control key 3 connected to the output bus 13. The cathodes of the valves 11 are connected together and connected to the output bus 14. One output bus 15 CB1 is connected to the point of connection of the capacitor 9 with the anode of the valve 11 of the first chain SND4, The second output bus 16 CB1 is connected through a series-connected controllable switch 2 and a pulse current driver 5 which is connected to the connection point of the capacitor 9 with the cathode of the valve 12 of the last chain of circuit 4. To the outlet ,. The busbars 13, 14 of the converter are equipped with a smoothing filter 6 and a load 8. At the input 17, 18, an AC voltage source is connected. The outputs of the control circuit 7 are connected to the control panel of the electrodes 1M keys 2 and 3. The method is illustrated by the operation of the device shown in FIG. In steady state, the alternating current AC voltage of sinusoidal shape, applied to the inputs of terminals 17-18, is converted by CBj with the number of rectifying phases. "1" 2 to the pulsating DC voltage Ug (see Fig. 2), which acts at the output of the valve system 15-16. At time tj, the key 2 is opened and the current pulse current driver 5 generates a rectangular charge current pulse with which the capacitors 9 of the circuit 4 which are connected in series through the valves 10 are charged. With the same capacitance of the capacitors 9, each of them is armature to about 1 / at a fraction of the voltage value of Ug, the law of voltage variation on the capacitors will be linear throughout the entire charge time, and, consequently, the steepness of the regulating characteristic will increase and its linearity will be ensured. During the charging time of the capacitors () key 3 is closed. At time tj, switch 2 closes, switch 3 opens, and the discharge of capacitors 9 connected in parallel through valves 11 and 12 to filter 6 and load 8 begins. The capacitor of filter 6 maintains voltage at load 8 during the charging of capacitors 9. Starting from tj, all processes are repeated. Since the energy from the primary source when charging capacitors by a rectangular current pulse with a constant amplitude does not change from period to period, the average value of the output voltage will be stabilized when the input voltage changes. The proposed method allows to increase the steepness of the regulating characteristic, to ensure its linearity and to stabilize .BtH input voltage when the input voltage changes. The invention method of converting alternating voltage to constant by changes in the type of current followed by cyclic sequential charging of n capacitors and parallel to their discharge, a load, characterized in that, in order to increase the regulating slope, the charging characteristic, ensure its linearity and stabilize the output voltage when the input voltage changes, the charge current of the capacitors form in the form of a rectangular pulse. Sources of information taken into account during the examination: 1. Moin BC et al. Stabilized transistor converters, ed. Energie, M. 1972, pp. 240-243, fig. 7-14

2. US patent 3477011, cl. 321-15, 1972.

3. The patent of the USA 3602795, cl. 321-15, 1972.

4. US patent 3808512, cl. 321-15, 1973.

5. The patent of Japan 46-12179, cl. H 02 m 7/00, 56 B 01, publications from 1.971 g.

R

P