SU1198689A1 - D.c.voltage-to-d.c.voltage converter - Google Patents

Description

The invention relates to a converter equipment, namely, transformerless low-voltage power sources operating on the principle of charging a chain of series-connected capacitors from a primary power source with their subsequent parallel discharge, to a load, and intended to power electronic equipment.

The purpose of the invention is to expand the functionality (the possibility of obtaining bipolar voltages relative to the common bus) and simplify the device.

The drawing shows a circuit diagram of the converter.

The DC / DC converter contains valve-capacitor units 1, each of which consists of steps made in the form of a series-connected first diode 2, a capacitor 3 and a second diode 4.

In each block, between the opposite plates of the capacitors of adjacent stages, a third diode 5 is connected accordingly. Each block is equipped with an additional diode 6, which is anode in the even-numbered unit, connected to the cathode of the second last-stage diode and cathode with a common output, and in the odd unit - cathode the anode of the first diode of the last stage and the anode with a common output formed by one output and input output 7.

In each block, the cathodes of the first diodes and the anodes of the second diodes are combined into the first and second common junction points, with the first common junction points of the odd blocks and the second common junction points of the even blocks form additional output pins. The second common points of connection of odd blocks and the first common points of connection of even blocks are combined with each other, respectively, and one of the common points of their connection is through key 8, and the other is connected through key 9

to a common conclusion. A load 10 and a filter capacitor 11 are connected between the common terminal and each of the output pins. The input of the first block is connected via key 12 to the input terminal 13. The common connection point of the cathodes of the first diodes of each odd block is connected via the switch 14 to the input of the next even block. The common connection point of the anodes of the second diodes of each even-numbered block is connected via a switch 15 to the input of a subsequent odd-numbered block.

The Converter operates as follows.

For the converter to operate, it is necessary to simultaneously close the keys 12, 14, 15, and when they are opened, close the keys 8 and 9.

In the steady state mode, when the keys 12, 14 and 15 are closed (the keys 8 and 9 are open), some capacitors are charged from the voltage source through the key 12, and the others from the smoothing capacitors 11 through the keys 14, 15 and diodes 6.

After the opening of the keys 12, 14 and 15 and the closure of the keys 8, 9, the capacitors 3 are discharged through the diodes 3 and 4 to the corresponding smoothing capacitors 11.

The output voltages of even and odd diode-capacitor blocks have opposite polarities with respect to the common lead.

The voltage at the outputs is determined by the expression

and. -,

1 ш ₁ К _г ш ^ .. .К, ш ₄

where and. - the voltage at the output of the corresponding diode-capacitor unit;

υ _6χ is the input voltage of the converter;

the number of capacitors steps included to the ί-th output;

6 ^ Κ ₂ .. · · are coefficients that take into account the degree of load of each step and the ratio of the times of closed states of keys 12, 14, 5 and 8, 9.

1198689

Uzhgorod, Project St., 4

Claims (2)

CONSTANT VOLTAGE VOLTAGE CONVERTER, containing input terminals for connecting a DC voltage source, key elements and η diode-capacitor blocks, each including first and second diodes and tons of capacitors combined in w steps, where w> 2, consisting of series-connected the first diode, the capacitor and the second diode, and t-1 of the third diode, each of which is connected between the different plates of the capacitors of adjacent stages, and in the even-numbered blocks each of the specified third diodes is an anode connected to the cathode of the second diode of the previous stage, and the cathode to the anode of the first diode of the subsequent stage, in each diode-capacitor unit, the cathodes of the first diodes are combined to form, respectively, the first and second common connection points, the first input terminal through the key element is connected to the input of the first diode-capacitor unit, the first common junction point of every odd * block through the corresponding key the element is connected to the input of a subsequent even-numbered unit, the output of which is connected to the input of a subsequent odd-numbered key through an appropriate key element, and a filter capacitor is connected between the output terminals, characterized in that, in order to expand its functionality and simplification, a second input terminal for connecting a constant source voltages and one of the output pins are combined into a common pin, the first common connection points of odd blocks and the second common connection points of even blocks form the corresponding g The additional output pins, the second common connection points of odd blocks and the first common connection points of even blocks are connected to each other, respectively, and each of the common points of their connection is connected to a common output through a corresponding key element; each of the diode-capacitor blocks is equipped with an additional diode connected in the odd block by the cathode to the anode of the first diode of the last stage, by the anode to the common conclusion, and in the even block by the anode to the cathode of the second diode of the last stage, and by the cathode to the common conclusion than each of the third diodes of even block the anode connected to the cathode of the second diode previous stage, and the cathode - to the anode of the first diode of the next stage, and between each RH additional output terminals and the common terminal included additionally entered the filter capacitor. 1198689 1198689 2 ' one