SU1328933A1 - Method of adaptive multichannel pulse-duration modulation and device for effecting same - Google Patents

Abstract

The invention relates to a pulse technique and can be used in low-frequency key amplifiers, powerful stabilized power sources. The aim of the invention is to expand the dynamic range of the modulation. In order to achieve this goal, a device for the selection of fronts and decays, a discriminator 7 pulses in duration, a discriminator 8 pauses in duration, ring N-bit counters 9 and 10 HN RS-flip-flops 11. The device also contains an error signal isolation unit 1, a relay element 2, an input signal bus 3, N-key power amplifiers 4, an adder 5. Performing new operations provided for in this method of adaptive multi-channel pulse-width modulation, and introducing new blocks and circuit elements in the device for implementing the method allowed to increase the modulation dynamic range by repeatedly extending the pulses of the width-modulated sequence at the output of the relay element. 2 sp.f-ly, 2 ill. With s (L oo to oo with S / d 00 ig. 1

Description

. 1 1328933

The invention relates to a pulse technique and can be used in low-frequency key amplifiers, power stabilized power sources.

The purpose of the invention is the expansion of the dynamic range of modulation.

FIG. I represents a block diagram of an apparatus for implementing the method Q of adaptive multichannel pulse-width modulation; figure 2 - timing charts of his work.

The adaptive multichannel pulse-width modulation method includes g ticking chains, the inputs of which are one- summed of a number of output pulses directly, and the second through

but with the second and the inputs of ring counters 9 and. 10, the first inputs of which are connected to the | outputs of the block 6 for the selection of fronts and special means, the outputs of the ring counter 9 are connected to the S inputs of short-circuit flip-flops II, respectively, and the outputs of the ring counter 10 are connected respectively to the ciR inputs of these RS-flip-flops, the outputs of which are through key power amplifiers 4 are connected to the inputs of the adder 5.

Block 6 of the separation of fronts and decays can be performed on two differential sequences, demodulation of the sum signal, comparison of the input signal with the demodulated one, formation of a sequence of width-modulated pulses, the duration of which is proportional to the result of the comparison, comparison of the durations of the pulse and pause of the sequence of pulse-width modulated pulses with reference values and when the latter are exceeded, the formation of the first and second pulse signals, the formation of a series of output pulses x sequences, the pulse edges in which are formed alternately on the fronts of pulses in a sequence of pulse-modulated pulses on either edge of the first pulse signal and pulse valleys alternately formed by recessions in the sequence of pulses the pulse-modulated pulse or the second pulse signal.

20

25

thirty

35

the inverter is connected to the output of the relay element 2, and the outputs to the inputs of ring counters 9 and 10, while only positive pulses are connected in parallel with the diodes to form at the inputs of the ring counters; dy anodes to the common bus.

The discriminator 7 pulses in duration can be performed on the element matches, the first input of which is directly, and the second through the delay element connected to the output of the relay element. The element of delay in the simplest case can be performed on the KS chain of

The discriminator 8 duration pauses differs from the discriminator 7 pulses in duration by the presence of an inverter at the input.

Ring counters 9 and IO can be performed on the connected after-.

conclusively binary counter, decrypt- Device for adaptive width-jg rator and differentiating chains.

pulse modulation contains an error signal extraction block 1, a relay element 2, an input signal bus 3, N key amplifiers, 4 power, an adder 5, a block 6. selection of fronts and decays, a discriminator 7 pulses in duration, a discriminator 8 pauses in duration, ring N bit counters 9 and 10, N RS-flip-flops 1L J, the first input of the error signal extracting unit 1 is connected to the input signal bus 3, the second input to the output of the adder 5 and the output bus, and the output to the relay element 2 whose output is connected to the inputs of the block 6 tim edges and recessions and discriminators 7 and 8 pulses and pauses for the duration, the outputs of which are connected to the binary counter sootvetstvenprichem input enabled two-input OR gate.

The i block of the signal can be performed on an integrator or low pass filter and a differential amplifier.

The device for adaptive multichannel pulse-width modulation works as follows (for simplicity, we consider the device to be three-channel).

At the output of the error signal extracting unit 1, a signal U is generated.

(Fig.2 5), the value of which is defined - b

It comes from the ratio

Urt) I E (t) -,

50

circuits whose inputs are directly and one through

but with the second and the inputs of ring counters 9 and. 10, the first inputs of which are connected to the | outputs of the block 6 for the selection of fronts and special means, the outputs of the ring counter 9 are connected to the S inputs of short-circuit flip-flops II, respectively, and the outputs of the ring counter 10 are connected respectively to the ciR inputs of these RS-flip-flops, the outputs of which are through key power amplifiers 4 are connected to the inputs of the adder 5.

Block 6 in the fronts and declines can be performed on two differentials.

the inverter is connected to the output of the relay element 2, and the outputs to the inputs of ring counters 9 and 10, while only positive pulses are connected in parallel with the diodes to form at the inputs of the ring counters; dy anodes to the common bus.

The discriminator 7 pulses in duration can be performed on the element matches, the first input of which is directly, and the second through the delay element connected to the output of the relay element. The element of delay in the simplest case can be performed on the KS chain of

The discriminator 8 duration pauses differs from the discriminator 7 pulses in duration by the presence of an inverter at the input.

Ring counters 9 and IO can be performed on the connected after-.

moreover, at the input of the binary counter is included two-input element OR.

The i block of the signal can be performed on an integrator or low pass filter and a differential amplifier.

The device for adaptive multichannel pulse-width modulation works as follows (for simplicity, we consider the device to be three-channel).

At the output of the error signal extracting unit 1, a signal U is generated.

(Fig.2 5), the value of which is determined - o

It comes from the ratio

Urt) I E (t) -,

0

where t is the time constant of the integrator that is part of the error signal block; E (.t) -summer output

(Fig.2zh-);

and - modulating signal. The signal Uj is fed to the input of the relay element (re) 2, having a hysteresis value dU (fig.2b). At the output of the operating element, a sequence of pulses is formed (Fig. 2B), the duration of which is determined by the magnitude of the input signal and ". With the release of ER 2

GL

: a sequence of pulse-width modulated pulses arrives at the front and fall-off block 6 (BVFiS), the discriminator 7 of the pulse in duration, and the discriminator of 8 pauses in duration.

BVFiS has two outputs, on the first of which short positive pulses are formed, corresponding to the front position, and on the second - the pulses corresponding to the decay position of the pulses from the ER 2 output (Fig. 2c).

The discriminator 7 pulse in duration forms a short positive pulse when the duration of the pulse at the output of the electrical generator 2 exceeds the set value t. The discriminator 8 pause in duration forms a short pulse when the duration of the pause at the output of ER 2 exceeds t.

Let the pulse duration at the output of ER 2 not exceed t, (for example, O: t t, FIG. 2B). BVFiS 6 generates short impulses at the outputs corresponding to the front and decay of impulses from the ER-2 output. These pulses go to the first (counting) inputs of the first 9 and second 10 ring counters (CS), the CS has three outputs, each of which is generated in turn a short pulse at the moment the signal arrives at the first counter input.

These pulses from the outputs of the COP 9 arrive at the S-inputs of the RS-flip-flops 11 and translate them into a single state. From the outputs of the CS 10, the pulses arrive at the R inputs of the RS flip-flops 11 and bring them to the zero state. As a result, three pulse width modulated pulse sequences are formed at the outputs of the RS flip-flops 11

five

0

five

0

five

0

five

0

five

(fng.2g-2e), which are then amplified by key power amplifiers 4 and summed in adder 5, forming a total output signal E (t) (fig.2g).

As the input modulating signal U increases (moment t, fig. 2a), the pulse t at the output increases and when t, (moment t, fig. 2c) reaches, the pulse discriminator 7 forms a short pulse that goes to the second pulse input CS 9. The latter operates in such a way that, when a signal appears at its second input, the order of pulse generation at its outputs changes (pulses that were alternately generated at the first, second and third outputs are now formed, respectively, at the second, t etem and first outputs).

The pulses from the outputs 9 arrive at the 8-inputs of the RS-flip-flops and form the fronts of the pulses of the output pulse sequences. The impulses from the output of the COP 10 form their downs. The pulse duration of the output sequences increased by T (pulse repetition period of the pulse sequence) as compared with the pulses at the output of ER 2 (Fig. 2d-2e)

A further increase in the input modulating signal U and the fact that it exceeds the set value (time t ,, Fig. 2a) triggers the drive of the riminator 7 pulses in duration and the duration of the pulses (Fig.2d-2e) again increases by.T. With a decrease in the input signal, the pause between pulses of the pulse sequence increases (Fig. 2b) and when the value of the set value t is exceeded t, the discriminator 8 of the pause length generates a short pulse that goes to the second input of the COP 10, which leads to a decrease in T pulse duration of the output pulses sequences. Consequently, an almost complete modulation of the pulse duration of the output pulse sequences is provided.

Thus, the introduction of new operations in the method of adaptive multichannel pulse-width modulation and new nodes into the device for implementing this method made it possible to increase the dynamic modulation range.

due to multiple lengthening of the pulses of the width-modulated sequence at the output of the relay element.

Claims (2)

1. Adaptive multichannel pulse-width modulation method, including summation of a series of output pulses, demodulation of the sum signal, comparison of the input signal with a demodulated signal, formation of a sequence of pulse-width modulated pulse f5, a frontalization unit and decays, pulse discriminator of duration, discriminator of pauses of duration, two ring N-bits of the counter and N (he-triggers, S-inputs The durations of which are proportional to the result of the comparison, and the formation of a number of output pulse sequences along the fronts and decays of width-modulated pulses, 20 of which are connected respectively with the fact that, with the outputs of the first ring N-rae, the purpose of expanding the dynamic modulation range is additionally formed first and second pulse RD inputs, R-inputs, respectively, with the outputs of the second ring N-bit counter, and outputs signals, respectively, when exceeding 25 with the inputs of key power amplifiers, pulse duration and pause, while the output of the relay element is of a sequence width-modulated — connected to the inputs of discriminator pulses of the set reference pulses and pauses in duration and from values, while on the fronts of the width-input of the block of the fronts and spacing of the pulses or on the fronts-30s, the outputs of which are connected to the first inputs of the first pulse signal, are formed alternately with the first inputs pulses fronts O N-bit counters, the second output pulse posledovatelnoe- inputs are respectively connected to m x, which recessions are formed but also to the outputs of discriminators pulses alternately. decay width-moduli j and pauses in duration. ipat.i Compiled by M, Leonova Editor N. Bobkova Tehred I. Veres Order 3497/57 Circulation 901 Subscription VNSHSHI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 pulses or the second pulse signal. 2. A device for adaptive multichannel pulse-width modulation, containing an error signal extraction unit, the first input of which is connected to the input signal bus, the second - to the output of the adder, and the output to the input of the relay element and V key power amplifiers, the outputs of which are connected to adder inputs, characterized in that, in order to broaden the modulation dynamic range, it additionally detector, pulse duration discriminator, duration pause discriminator, two ring N-bit counters and N (n-triggers, S-inputs which are connected respectively with the outputs of the first ring N-rae which are connected respectively with the outputs of the first ring N-rae an ordinary counter, R-inputs - respectively with the outputs of the second ring N-bit counter, and outputs Proofreader E. Roshko