SU1347130A1 - D.c.-to-d.c.voltage converter - Google Patents

Description

The cut additionally inserted diodes 7, connected in the forward direction, are connected to the corresponding output pins for connecting the irarpy 8. The anodes of the diodes 4 of the odd blocks are connected via a switch 10 to the common output. The cathodes of diodes 2 even-numbered blocks are connected to the input terminal for connecting the plus of the constant voltage source, and through a switch

one

The invention contributes to converter technology, namely, to transformerless low-voltage power sources operating on the principle of charging a chain of successively 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 simplify and increase the reliability of the converter.

The drawing shows a circuit diagram of an electrical circuit,

The DC / DC converter contains valve-condenser units 1, each of which consists of steps made in the form of serially connected first diode 2, capacitor 3 and second diode 4. In each block between opposite plates of capacitors adjacent The third diode 5 is connected in a proper way. Each block contains the fourth diode 6, which is connected to the cathode of the second diode of the last stage in the even-numbered block, and the cathode with the anode is connected to the cathode of the second diode. m of the first diode of the last stage and the anode - with a common conclusion. In each block, the cathodes of the first diodes and the anodes of the second diodes are combined into the first and second common connection points, with the first common connection points of the diodes of the odd blocks connected to the anodes of the fifth diodes 7 and the even blocks of the even blocks connected

11 - with a general conclusion. The input terminal for connecting the minus of the constant voltage source is connected to the cathode of the diode 4 of the first stage of the first block 1. The purpose of the invention is achieved due to the fact that regardless of the number of blocks 1 charge and discharge of capacitors 3 is provided using only two switches 10, 11 .1 il.

with the cathodes of the diodes 7, the anodes of which for even blocks and the cathodes for odd blocks are connected to the second terminals of the loads 8, in parallel with which the smoothing capacitors 9 are connected, the first terminals of the loads are connected to a common terminal. The second common connection points of the diodes of the odd blocks and the first common connection points of the diodes of the even blocks are interconnected and are respectively connected via switches 10 and 11 to the common output. The first common junction point of the diodes of each odd block is connected to the anode of diode 2 of the first chain of the next even block. The second common junction point of the diodes of each even-numbered unit is connected to the cathode of diode 4 of the first chain of the next odd-numbered unit. The minus of the voltage source is connected to the cathode of diode 4 of the first block, and the plus to the first common connection points of the even blocks.

The converter works as follows.

The operation of the converter requires the alternate closure of the keys 10 and 11.

In the established mode, when the key 10 is closed, the capacitors of the first odd unit from the voltage source are charged through the switch 10 and the diodes 5 and 6 of the first unit, the capacitors of the remaining odd units are charged from the capacitors of the even units through the switch 10 and the diodes 5 and 6 of these units. After the unlocking of the key 10 and the closure of the key 11, the capacitors of even blocks are charged

313

from the capacitors of the odd blocks through the key 11 and the diodes 5 and 6 of these blocks.

Diodes 7 are turned on to prevent discharging of filter capacitors when keys 10 or 11 are closed.

Thus, a constant voltage is formed on the loads of 8 blocks, while the outputs of the odd blocks are positive relative to the total output, and the outputs of the odd numbers are negative. The magnitude of the voltage on the loads is determined by the expression

and.

Uex

K.m -Kj-m2, ..., K.m;

where Ugx is the input voltage of the converter;

and. - voltage at the corresponding load; m, mj, ..., m; - the number of capacitors steps included up to i-load;

K, K J ,,,., K. - coefficients taking into account the degree of load of each of the blocks, the ratio of the time of closed and open states of keys, capacitance of smoothing capacitors and capacitors of blocks, switching frequency.

The proposed converter has only two keys, regardless of the number of blocks, which simplifies the device and increases its reliability.

Claims (1)

Invention Formula Constant voltage to constant voltage converter, containing input terminals for connecting a source of a constant voltage to key elements and diode-capacitor blocks, each included in. m first, m second diodes and m capacitors combined in m stages, where 2 consisting of a series-connected first diode, a capacitor and a second diode, t-1 third diodes and a fourth diode, each of the third diodes is connected between opposite plates of adjacent capacitors steps, and in even blocks each of these third VNIIPI Order 5124/49 Circulation 658 Subscription Production polygr, pr-tie, Uzhgorod, st. Project, 4 0 five 0 thirty 25 35 0 45 50 55 304 the diode anode is connected to the cathode of the second diode of the previous stage, the cathode is connected to the anode of the first diode of the next stage, the fourth diode is connected to the cathode of the second diode of the last stage by the cathode, and to the common conclusion in odd blocks, each of the third diode is connected to the anode of the first diode the previous stage, and the anode to the cathode of the second diode of the next stage, the fourth diode is connected to the cathode with the anode of the first diode of the last stage, the anode to the common output, in each diode-capacitor unit the cathodes of the first diodes Inoens, anodes of the second diodes are combined — to form, respectively, the first and second common connection points, the first common connection points of even blocks and the second common connection points of odd blocks are combined with each other and, respectively, the first and second keys are connected to the common output, which is the first output a terminal for connecting p loads, in parallel, each of which includes a filter capacitor, characterized in that, in order to simplify and increase reliability, a fifth diode is inserted into each block, with the first The common connection point of the diodes of each odd block is connected to the anode of the fifth diode of this block and to the anode of the first diode of the first chain of the next even block, the second common point of connection of the diodes of which is connected to the cathode of the second diode of the first chain the subsequent odd block, the cathode of the fifth diode of each odd block and the anode of the fifth diode of each even block, connect 5 to the corresponding second output pins for connecting the corresponding loads The output for connecting the minus of the constant voltage source is connected to the cathode of the second diode of the first chain of the first block, the second input terminal for connecting the positive source of the constant voltage source is connected to the first common connection points of the diodes of even blocks. Circulation 658 Subscription