SU1598072A1 - D.c. to d.c. converter - Google Patents

Abstract

The invention relates to a converter technique. The goal is to expand the range of regulation and reduce the ripple of the consumed current due to the accumulation and recovery of electrical energy. The device contains a thyristor bridge 1-4. Additional thyristors 21, 22 and primary windings 10, 11 tr-ra are connected to the switching capacitor 5. Secondary winding 16 tr-ra included in the diagonal of the bridge reverse diodes 17-20. In the short circuit mode. all power consumed from the source minus losses in the converter is returned to the source. 2 hp f-ly, 1 ill.

Description

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00 About VI

The invention relates to electrical engineering, namely to power semiconductor (thyristor) converters of electric energy of direct current, and can be used to regulate the power consumption of power sources.

The aim of the invention is to expand the control range and reduce the ripple of current consumption due to the accumulation and recovery of electrical energy.

The drawing shows the scheme of

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The converter consists of a bridge on thyristors 1-4, the diagonal of the alternating current of which includes the switching capacitor 5, the diagonal of the direct current of the bridge is connected in series with the choke 6, the load 7 and connected to the input terminals 8 and 9. Two primary windings 10 and 11 of the transformer are connected to the diagonal of the alternating current of the thyristor bridge, and through reverse diodes 12-15 to the input pins. The secondary winding 16 of the transformer is included in the diagonal of the alternating current of the return bridge on the diodes 17-20, connected by a diagonal of direct current opposite to the input terminals 8 and 9.

Additional thyristors 21 and 22 are connected to the diagonal of the alternating current of the bridge and the circuit of the combined cathodes to the negative input terminal 9. The circuit of the cathodes of the thyristors 21 and 22 can include: an electrical energy storage device in the form of a capacitor battery, battery, or others; a control load such as a ballast resistor; busbar bus and others.

The device works as follows.

The pulses of a constant frequency, formed in the control circuit, alternately open the thyristors; 14-23; 1.4, etc. in the mode of rated load and 1,4,22; 2,3.21; 1,4,22 and so on in the short circuit mode, when the power consumed by the converter is minimal, and the control pulses of the additional thyristors 21 and 22 are changed with the help of an additional device for selecting the operating mode of the converter inserted into the control circuit and turning on the frequency divider with a variable delbny or pulse width pulse modulator

In both modes of operation of the converter, capacitor recharging occurs.

0 5

When the thyristors 1 and 4 are turned on, the recharging current of the capacitor is transferred in load 7 through the circuit output 8 - choke 6 and thyristor 1 - capacitor 5 - thyristor 4 - second throttle output 6 - load 7 - output 9. In short-circuit mode at the minimum power consumption, the overcharging current of capacitor 5 when the thyristors 1.4 and 22 are on passes through the circuit output 8 - choke b - thyristor 1 - capacitor 5 - thyristor 22 - output 9. If the voltage on the capacitor 5 is lower than the supply voltage, diodes 12 and 15, 13 and 14 are closed. If, for example, with open thyristors 1 and 4, the potential of the average output of thyristors 3 and 4 is lower than the potential of thyristor 2, diode 15 is opened. However, the current through diode 15 will not go, because the inductance of the transformer primary winding 11 is closed when the diodes 17-20 are closed. With a further increase in the voltage on the capacitor 5 and the open diode 15, the voltage on the winding 16 reaches the voltage level on the terminals 8 and 9 and the diodes 18 and 19 open. A further increase in the voltage on the capacitor 5 stops. The throttle current, which cannot stop instantaneously, closes across the circuit choke 6 - load 7 - pin 9 - diode 15 - transformer primary winding 11 - thyristor 4 - choke 6, and choke 6 across the circuit - transformer primary winding 10 - diode 12 is choke 6, and the energy is transformed into winding 16. The circuit output 9 - diode 18 is winding 16-diode 19 - output 8 the energy of the chokes is returned to the source, In the nominal mode, control pulses are not supplied to the additional thyristors 21 and 22 and then total power minus losses to conversion the receiver is dissipated at load 7. In a short circuit mode, all power consumed from the source minus losses in the converter is returned to the source. By adjusting the frequency of the control pulses using an additional device, selecting the operating mode of the converter and, accordingly, opening the thyristors 21 and 22, you can smoothly change the power consumed by the converter without changing the frequency and phase of the control pulses to the main thyristors 1-4. Consequently, the frequency and duty cycle of the consumed current throughout the entire range of load variation are maintained at the level of nominal, the ripple of the consumed current in the minimum power consumption mode is reduced, the operating conditions of the power source are improved, and the masses and dimensions of the filters are reduced.

Claims (3)

Claims 1. DC / DC converter containing a thyristor bridge with a switching capacitor in an AC diagonal whose DC diagonal is connected to a positive input terminal through a switching choke and to a negative one through serially connected switching choke and a load circuit, reverse diodes and a stabilizing feedback transformer with two primary windings and one secondary, included in the diagonal of alternating current of the reverse diode m a DC-connected diagonal to the input pins, as well as two additional diodes, distinguished by the fact that, in order to expand the control range and reduce the ripple of the current consumed by accumulating and recovering electric energy, two additional diodes are introduced thyristor connected to the negative input terminal by a circuit of the combined cathodes, and anodes to the diagonal of the alternating current of the thyristor bridge connected to the ends of the primary motor circuits mentioned of the transformer, the other ends of which are connected to the common points according serially connected pairs of additional diodes connected in the opposite direction with the input pin. 2. The Converter according to claim 1. This is due to the fact that the electric energy storage device, included in the cathode circuit of additional thyristors, was introduced. 3. The converter according to claim 1, of which is a resistor that is included in the cathode circuit of additional thyristors.