SU984003A2 - Staircase voltage generator - Google Patents

Description

(54) STRAINED VOLTAGE GENERATOR

The invention relates to a pulse technique and can be used, for example, in voltage forming devices.

According to the main auth. 687571 A step-voltage generator is known that contains a pulse counter, the direct and inverse outputs of which are connected to the inputs of a switch, the outputs of which are connected to the inputs of a digital-to-analog converter, the high discharge output of a pulse counter is connected to an input of a trigger, the output of which is connected to a control input of a switch C15.

A disadvantage of the known device is the low linearity of the output voltage being formed.

The aim of the invention is to increase the linearity of the output voltage being formed.

The goal is achieved by the fact that in a step generator. containing a pulse counter, the direct and inverse outputs of which are connected to the inputs of the switch. the output of which is connected to the inputs of the digital-analog converter, the output of the highest charge of the pulse counter is connected to the trigger input, the output of which is connected to the control input of the switch, the element OR is entered, the first input of which is connected to the input bus, the second input - to the output of the second counter pulses, output - to the input of the pulse counter.

The drawing shows a structural electrical circuit of the device.

ten

The device contains a counter 1 pulses cocmutator 2, digital-to-analog converter 3 ,. trigger 4, element OR 5, bus 6 inlets, bus 7 outlets.

15

The device works as follows.

In the initial state, counter 1 (on its direct outputs) is set to zero, i.e. fixed code

20 combination 000 ... 00, trigger 4. so. is also set to zero, while the outputs of the digital-to-analog converter 3 are connected via a switch 2 to the output of the counter 1, i.e. In the course of the digital-to-analog converter 3, a zero voltage level is set.

Each input pulse arriving at the input of counter 1 through the element

30 OR 5, increases the content of N counter 1 by one, respectively, the output voltage of the D / A converter 3 increases with a fixed value and N, i.e., an increasing voltage is formed at its output, and the duration of each step is equal to the period of the input pulses f .

After the code combination 111 ... 11 is fixed on the counter 1, the maximum voltage is set at the output of the digital-to-analog converter 3, the next input pulse will switch the counter 1 to the state 000, .. 00 and trigger using the trigger 4 and the switch 2 Switching the inputs of the digital-to-analog converter 3 from the direct outputs of counter 1 to inverse ones. Simultaneously impulse. overflow from the output of the discharge of counter 1 enters through the / element OR 5 to the input of counter I and allocates its contents by one, i.e. on the direct outputs of the counter: 1, the code combination 000, .. 01 will be fixed, and on the inverse outputs, the code combination 111 .... 10.

As a result, the code combination 111 ... 10 will be present at the inputs of the digital-to-analog converter 3 connected to the inverse outputs of counter 1, and the output voltage will go to the next level in the direction.

Thus, the duration of the output voltage step at the maximum level is equal to the duration of all other steps of the stepwise rising branch of the output voltage.

Each next pulse arriving now at the input of counter 1 reduces the code present at the inputs of the digital-to-analogue converter 3 by one, respectively, the output voltage of the digital-to-analogue converter decreases by a fixed value aN, i.e. at its output, a stepwise decreasing voltage is formed, the duration of each step of which is equal to the period of the input pulses t.

After setting the pulse counter to the status 111 ... 11 on its inverse outputs connected to the inputs of the digital-to-analog converter 3 using trigger 4 and switch 2, the code combination 000 ... 00 will be fixed, at the output of the digital-analog converter 3 the minimum (zero) voltage level.

The next input pulse sets the counter 1 to the state 000 ... 00 and triggers trigger 4 and 5 of switch 2 to switch the inputs of the digital-to-analog converter 3 from the inverse outputs of counter 1 to the forward ones.

At the same time, the overflow pulse from the high-order output of counter 1 flows through the element OR 5 to the input of counter 1 and increases its contents by one, i, e, the direct combination of the code 000 ... .01 will be detected at the direct outputs of the counter.

The same combination will be present at the inputs of the digital-to-analog converter 3, and its output voltage will go to the next upward - level, and the formation of a stepwise increasing voltage will begin again.

 the invention

Step voltage generator on auth.St. No. 687571, characterized in that, in order to increase the linearity of the output voltage, an OR element is inputted into it, the first input of which is connected to the input bus, the second input to the high voltage output of the pulse counter, and the output to the input of the pulse counter.

Sources of information taken into account in the examination

1. USSR author's certificate No. 687571, cl. H 03 K 4/02, 01.20.77.

Claims (1)

Automatic voltage generator No. 687571, characterized in that, with the aim of 40 increasing the linearity of the generated output voltage, an OR element is introduced into it, the first input of which is connected to the input bus, the second input to the output of the high-order counter 45 pulses, and the output is to the input of the pulse counter. Sources of information taken into account during the examination 1. Copyright certificate of the USSR