SU560333A1 - Pulse Width Modulator - Google Patents

Description

one

The invention relates to a class of pulsed devices and can be applied in the systems of information-measuring and computer equipment, remote control and automation.

A pulse-width modulator is known, a content comparing element and a key bit circuit connected via an integrating element and a trigger, respectively, to a reference current source and a clock pulse generator 1.

The disadvantage of such a device is the presence of thermal dynamic leakage.

The purpose of the invention is to improve the measurement accuracy.

This is achieved by introducing an offset element, a second comparison element and a standby multivibrator connected to an output of a first comparison element, and an input to an output of a second comparison element, the output of an integrating element through the serially connected second element of the proposed gate-modulator modulator. and the bias element is connected to an input source.

The drawing shows a diagram of the proposed pulse-width modulator.

The modulator consists of the first comparing element 1, the bias element 2, the trigger 3, the clock signal generator 4, the key 5, and the tag element 6, the source of the reference nanometer 7, the second comparing element 8 and the multivibrator 9.

The signals of the channels with a pulse frequency of the clock signal generator 4 are periodically connected to the input of a pulse width modulator modulator. These signals are fed to the first input of the first comparing element 1 and to the bias element 2, which is an input voltage of EC. Simultaneously with the input to the signal input of any channel, the trigger 3 is set to one by a pulse of the clock signal generator 4. At the same time, through the switch 5, the charge is removed from the integrating element 6, after which the next clock pulse is generated by the source of reference voltage 7 at the output of the integrating element 6 again the Unil-I voltage is reached. the time variable ti triggers the second comparing element 8, the output impulse of which triggers the continuous multivibrator 9. The vibrator produces a strobe pulse for Tc, which translates the left comparing element 1 into a wire its state.

After comparing the signals of 6n n Lbx at the moment of 2 tons, the comparing element 1 produces a HOBTOipHoe switched trigger 3.

Thus, the comparison element 1, which determines the magnitude of the system day error, is / is in the conducting state during Tc time.

The degree of reduction of thermal dynamic immobility is determined by the wall of decreasing mobility dispersed in the comparative element 1, which is equivalent to the decrease in the time the element is in the conducting state, i.e. determined by the ratio -.

Claims (1)

Invention Formula The pulse width modulator contains anp; n the first comparison element, one of the outputs of which is connected through a sequential connection trigger, the second input of which is connected to the clock generator, the integrating element, the second input of which is connected to the reference voltage source, and one of the inputs, the source of the input signals, which is connected with the fact that, in order to increase the accuracy, a displacement element was introduced in it, the B-comparison element and the waiting multivibrator connected to the output with the first element th comparator and input - with the output of the second comparator elemeita, output of the integrating element connected in series through the second comparing element and a biasing element connected to a source of input signals. Sources of information, taking into account the expertise: 1. Kulikov, S. V., Chistkov, B. V. Discrete transistor signal converters. M., “Eiergy, 1972, p. 143.  l / n „Bbiirod