SU1100725A1 - Method of converting continuous signal in sampled signal - Google Patents

Abstract

METHOD FOR CONVERTING of continuity SIGNAL ISHULSNY comprising forming the reference straight mougo1lnogo signal, the integration of continuous converted and a reference signal, the comparison integration results and using the reference signal as an output, characterized in that, in order povBsheni accuracy conversion, integration converted and the reference signal is carried out at the same time, until the results are equal, after which these results are dropped to zero and a new cycle is started § rebrain neither

Description

The invention relates to a pulse technique and can be used in converters of information, in power sources with a pulse control. There is a known method of converting a continuous signal into a pulse one, based on periodic comparison within the sampling intervals of the converted continuous signal with a reference sweep and recording time intervals between clock points and equality moments of the compared signals, while simultaneously integrating the continuous and reference unwrapped signals are compared before the operation. As a reference, a sawtooth voltage with equal sampling periods is used, which is simultaneously integrated with the converted continuous signal and fed to a comparator. The beginning of the formation of each output pulse coincides with the beginning of the next sampling interval, and its end is determined by the moment of equality of the compared integrals. After this moment, the specified signals are integrated, but the information about the converted signal is not used from this time until the end of the sampling period, which leads to a significant increase in the reproduction error of the converted continuous signal. The output transformed voltage is a sequence of pulses of different duration with a constant frequency ij. The disadvantage of this method is low accuracy due to the loss of information about the signal to be converted from the time of equality of the voltage integrals to the end of the sampling interval. The closest in technical terms and the result achieved is a method of converting a continuous signal into a pulse signal, including the formation of a reference rectangular signal, the integration of a non-perrigonally convertible and a reference signal, a comparison of the integration results and the use of a reference signal as an output signal, and integrating the input signal and this signals are carried out sequentially, the result of this integration is compared with a constant value, and when they are equal, next conversion cycle 21. The disadvantage of this method also lies in the low accuracy of the conversion, especially in the region of small values of the input signal, due to the inclusion in the conversion interval of the integration time of the reference signal. The purpose of the invention is to improve the accuracy of converting a continuous signal into a pulsed signal. This goal is achieved by the fact that according to the method of converting a continuous signal to a pulse signal, including the formation of a reference rectangular signal, the integration of a continuous convertible and a reference signal, the comparison of the results of the integral signal and the use of a reference signal as an output signal, the integration of a continuous convertible and reference signal simultaneously, until the results are equal, after which these results are dropped to zero and a new conversion cycle begins. The drawing shows one of the possible implementations of the proposed method in a device for converting a continuous signal into a pulse signal. The device contains two channels for passing convertible and reference signals. The first channel contains the source 1 of a continuous convertible signal, the output of which (Go through rectifier 2 and integrator 3 is connected to one of the inputs of comparator 4. The second channel contains a waiting generator 5 rectangular pulses, the output of which through integrator 6 is connected to the second input of comparator 4. The output of the latter is connected to the zeroing inputs of the integrators and the input of the waiting generator 5 rectangular pulses. The outputs of the continuous conversion signal source 1 and the waiting generator 5 rectangular pulses are connected to the inputs D selectors 7 and 8, which form the output circuit of the converter.In addition, the device contains a sensor 9 zero of the signal to be converted, connected between the output of the source 1 of the signal being converted and the second input of the waiting generator 5 rectangular

pulses, as well as the element 10 delay, included between the outputs of the sensor 9 and the first input of the waiting generator, 5.

The function of the selectors is to match one of the half-waves of the convertible bipolar signal, the Jumper 2 and the selectors 7 and 8 are needed only in the case of a bipolar converted signal. With a uni-polar signal, the transformed signal is taken directly from the output of the square-wave generator, Tie. its output pulses are simultaneously used as reference and output. the generator has two inputs: the first is for starting, the second is for bringing its S initial (zero) state. As this generator can be used standby generator, standby multivibrator, etc. A zero sensor 9 and a delay element 10 are needed to bring the circuit back to its original state through half a period of the signal being converted. This eliminates asymmetry over the half periods of the converted signal.

The device works as follows.

Let the continuous signal to be converted be sinusoidal. At the moment t О, the signal from sensor 9 zero of the signal being converted is fed to the second input of the waiting generator 5 of rectangular pulses and brings it to the initial (zero) state. In addition, this signal is delayed by a delay element 10.

for the time required to bring the generator 5 to the initial state, and goes to the zero inputs of integrators 3 and 6 and the first input of the generator 5. The latter begins to form a rectangular pulse and simultaneously begins the next integration of this pulse and the voltage being converted by integrators 6 and 3, respectively . The formation of the reference signal ends, after which the voltage at the output of the integrator 6 remains constant, and at the output of the integrator 3 it continues to increase. When the voltage at the outputs of the integrators 3 and 6 becomes equal, the comparator 4 will work, the output pulse whips the integrators and restarts the waiting generator 5. Next, the processes in the circuit are repeated in the described sequence. Using selectors 7 and 8, the reference signals, which are simultaneously output, are separated according to the positive and negative half-periods of the signal to be converted and are used, for example, to control the keys of the power section of an output voltage pulse-modulated inverter.

The proposed method provides higher accuracy of the conversion due to the equality of the integrals of the transformed and reference signals in the conversion interval, elimination of error from information loss in the areas of pauses between the output pulses and due to the fact that the conversion interval is proportional to the input signal only.

Claims (1)

METHOD FOR CONVERTING A CONTINUOUS SIGNAL TO A PULSE SIGNAL, including the formation of a reference rectangular signal, integration of a continuous converted and reference signals, comparing the integration results and using the reference signal as an output, characterized in that. in order to increase the conversion accuracy, integration of the converted and reference signals is carried out simultaneously until the results are equal, after which these results are reset to zero and a new conversion cycle is started. SU _p „1100725