SU1408504A1 - D.c. to d.c. voltage converter - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in the transformerless power supplies of electronic equipment. The purpose of the invention is to expand the functionality of the converter. The converter contains a constant voltage source (PSI) 3, which through bi-directional multiplexers 4, 5 is alternately connected to one of the N series-connected capacitors 6. The control inputs of the multiplexers are combined and connected to the outputs of the optionally entered m - discharge counter 2, the input of the generator 1 connected to the output. In multiplication mode of the PSI 3, alternating charge of the capacitors 6 is carried out up to the voltage of the PSI 3. Since Since the tori 6 are connected in a series circuit, then at its output the voltage is N times the voltage of the PSI 3 In the dividing mode from an external source connected to the output buses 7, 8 parallel to the chain of capacitors 6, the PSI 3 is sequentially recharged from different capacitors with a voltage equal to the voltage of the PSI 3. Thus, the converter is reversible and operates in the division mode as well as in the voltage multiplication mode by an integer number. The absence of the power supply diodes reduces the losses April voltage when multiplying I yl. with sl. i.

Description

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The invention relates to electrical engineering and can be used in transformerless power supplies of electronic equipment.

The purpose of the invention is to expand the functionality of the converter.

The drawing shows the functional diagram of the converter; The converter contains jrop 1, to the output of which a 1P-bit counter 2о is connected. The first constant-voltage source 3 is connected to the inputs of the K-bit multiplexers 4 and 5, each of which has control inputs and S outputs The power inputs of multiplexers 4 and 15 are pairwise combined and connected to the corresponding outputs of counter 2 | A chain of series-connected capacitors 6, the number of which | is N, where K 2% is connected between | output buses 7 and 8 of the second source power supply, with the tire 8 being | common.

 The first output of multiplexer 4 is connected to bus 7, the last output of multiplexer 5 is connected to bus 8, each of the remaining outputs of multiplexer 4, starting from the second, is connected to one of the corresponding of the remaining outputs, starting from the first, multiplexer 5 and one of the common connection points of the corresponding pair of capacitors 6, the input power supply circuits of the generator 1, counter 2 and multiplexers 4 and 5 are connected to the power supply buses 7 and 8. The generator 1 and the counter 2 are designed to form the signal control of the multiplexers 4 - and 5, which carry out a serial periodic connection of the source 3 of a constant voltage to the capacitors 6.

The converter works as follows.

The converter can operate in the modes of multiplying the source voltage 3 times and times and dividing the external source voltage by No

When the device is put into multiplication mode, it is necessary to briefly connect the source to the output terminals of the capacitor chain with a voltage equal to W, where U is the voltage and source 3. At this, generator 1 and counter 2 start to work, on m outputs of which

control signals multiplexers. Since the control multiplexer inputs are combined, then by i-th (, K)

the signal, the multiplexer inputs are connected to the i-th outputs and the source 3 is connected through multiplexers to the 1st capacitor, which is charged to the voltage U I

With the arrival of the next pulse from the generator I, the counter 2 goes into the (i + 1) -th state, according to which the multiplexers connect the source 3 to the (1+) -th capacitor „

In this way, sequential charging of the capacitor circuit 6-6c is performed. Since the capacitors are connected in series, the voltage U is multiplied by N.

After the transients are completed, the external source can be disconnected, since the power of the generator, counter and multiplexers is supplied from the multiplied voltage of the source; nickname 3, equal to U -, - Ho

: When using source 3 as a backup power source, the device operates in the dividing mode of the main source to No. In this mode, the main source with a voltage of 1 UN connects parallel to a capacitive divider of N capacitors, and the primary source is connected with multiplexers 4 and 5 is connected in series and periodically to the elements of the capacitive divider and is recharged before the voltage Ug / No. When the main source is disconnected, the device automatically switches to the mode of multiplying the voltage of source 3 and autonomous operation from backup power source 3

Thus, the possibility of multiplying and dividing a constant voltage by an integer, as well as the possibility of reserving power sources with lower voltage elements,

Formula and gain

A constant voltage to constant voltage converter, containing a first constant voltage source, a generator, an electronic switch, a chain of N series-connected capacitors, and a second power source, to Vyg: one bus, one of which is common,

An input generator power supply circuit is connected, characterized in that, in order to extend the functionality, an additional counter is introduced, and the electronic switch is designed as a first and second N-channel bidirectional multiplexers, where N 2, the input of each of which is connected to the output of the first constant voltage source, the control inputs of the multiplexers are pairwise combined and each of their common connection points is connected to the corresponding counter output, the input of which is connected to the output m generator.

The first output of the first multiplexer and the Nth output of the second multiplexer are connected respectively to the first and common buses of the second power source, and each of the remaining outputs, starting from the second, first multiplexer, is connected to the corresponding one of the remaining output outputs, starting from the first, second multiplexer and with a common connection point corresponding to a pair of capacitors of the specified chain connected between the output buses of the second power source, to which the input power supply circuits of the counter and multiplex are connected litter about

Claims (2)

50 claims A DC / DC converter containing the first DC voltage source, 55 generator, electronic switch, a chain of N series-connected capacitors and a second power source, to the output buses κοτορο-ι: go, one of which is common, 3 1408504 an input power supply circuit of the generator is connected, characterized in that, in order to expand the functionality, an additional counter is added, and the electronic switch is made in the form of the first and second N-channel bidirectional multiplexers, where N = 2 ^П , the input of each of which ω is connected to the output of the first DC voltage source, and the control inputs of the multiplexers are paired and each of their common connection points is connected to the corresponding counter output, the input of which is connected with the generator output, the first output of the first multiplexer and the Nth output of the second multiplexer are connected respectively to the first and common buses of the second power supply, and each of the remaining outputs, starting from the second, first multiplexer, is connected to the corresponding one of the remaining output outputs, starting from the first , the second multiplexer and with a common connection point of the corresponding pair of capacitors of the specified circuit connected between the output buses of the second power source, to which the input power circuits are connected sensor and multiplexers.