SU1251293A1 - Square-wave generator - Google Patents

Abstract

The invention relates to a pulse technique. The purpose of the invention is to provide separate electronic control of the duty cycle and frequency in the pulse generator, made on the basis of a trigger, each arm of which is covered by feedback through an electronically controlled delay element. This is achieved by using two control voltage sources connected respectively to control inputs of the generator delay elements, so that the voltage for controlling the frequency is applied both to the delay elements in-phase, and the voltage for controlling the duty ratio is ivofazno. 2 Il. N) SD: O9

Description

IES shaving refers to an immersion technique and can be used in automation devices as a generator and pulses with an electronically controlled frequency and duty cycle.

The aim of the invention is to provide a separate electronic control of the duty cycle and pulse frequency.

FIG. Figure 1 shows the scheme of the gfed lagged generator of prong pulses; Fig. 2 is a diagram of an electronically controlled delay element.

The device contains a trigger I ,,

elements 2 and 3 for; n; holders designed to generate an output signal with a delay of time determined by the voltage of the voltage applied to their control inputs 4 and 5, the resistor dividers in and 7 ,. the voltages of the frequency control and the source 1 for controlling the duty cycle of the second terminals 12 (13, one of the last I2 is connected directly to the South 5 and the other H through the inverter 14) dividers 6 and 7 are connected to control inputs 4 and 5 of delays 2 and 3 delays, respectively, and the outputs of delay elements 2 and 3 are connected to inputs 15 and 6 of the trigger.

The device / fig,) works in the following direction

Suppose that the load on the left shoulder of the trigger U ,,. tnvteeT high potential, and NEPr: nenia on the gray shoulder of the trigger -, ;;,;, is equal to zero, then the high potential U and, POSTUy /;

Says input trigger element 2 delay. After some time, the voltage limited by the control code 4, supplied from the output of the delkrl 6 capturing, to the curved side of the delay element 2, forms a high potential, which is fed to the input 15 of the trigger 1 and the re; lays it down. At the exit of the left shoulder, capra kenya U ,,,, becomes equal; to zero. Right Gshechi - high

vi (and exit

in bt 11 2

Life comes from. c; the delay of the delay element 3 and through the Toro Ix, the time determined by the voltage

0

J

0

0

five

The output of the divider 7 rrrrrrrrrrrr, the course of the element 3 of the delay forms a high potential, arriving at the input 16 of the trigger i, under the action of which the trigger returns the initial state. Further, the processes are repeated.

The center of correct function of the voltage device at the terminals 12 and) 3 dividers 6 and 7 must be equal in absolute value, but opposite in sign. For this, the gain of the inverter 14 is taken equal to one,

The voltages on pins 8 and 9 of dividers 6 and 7 are the same and equal in} green. Not one of the source 0, "

Changes and voltages at the outputs of dividers 6 and 7 are determined by changes in the voltages of the control sources 10 and II. In this case, a change in the voltage of the source J O leads to a proportional change in the voltage - the outputs of the dividers in the same direction, and a change in the voltage of the source 1 causes a change in the voltages at the outputs of the dividers 6 and 7 to the opposite of the sirens.

With a constant voltage source K) the number of delay times - to: -, emers: com 2 and 3 is unchanged when the voltage of the source changes, while changing only the offset of the output 1.pulses 5 and the frequency of the constant .

When the source voltage I1 is constant, the voltage variation of the source; and iO leads to the fact that the voltages change simultaneously at the same inputs: at the control inputs of the storage elements, i.e. there is a change in the frequency of the following 1k: pulses at a constant cross-section.

Fig. 2 shows an example of the implementation of an electronically controlled delay element;

Zlenent Zade.chski is made on the basis of the integrator 17 and connected to the compiler 18 code, and moreover. The integrator composes of consistently included x con, n, capacitor and resistor, - 20, switched.: :( 2.

entrance

 9

and output 23 integrator

Matching matches with input 9J (delay;.; Keinertirutadik

the input of the comparator 18, the inverting-Shch1-Sh, whose input is connected to the control; 1 is the inlet of the delay element. The output 24 of the comparator I8 is connected to the output of the delay element.

At the zero potential at the input 22 of the integrator, the capacitor 19 is discharged, then the voltage at the output 24 of the comparator is zero (or negative polarity, which depends on the type of comparator used).

When a high positive potential arrives at the input 22 of the integrator 17, the capacitor 19 begins to charge through the resistor 20. When the voltage across the capacitor and, therefore, to the non-inverting input of the I8 comparator exceeds the voltage acting on the inverting input, the comparator 18 operates, At the output 24, a high voltage level of positive polarity is applied to the corresponding trigger input.

When a zero potential arrives at the input 22 of the delay element, the capacitor 9 is quickly discharged through the diode 21, and the comparator 18 switches to an idle state,

UteialiG

Order 4424/56 Circulation 816 Subscription

VNIIPI USSR State Committee

for inventions and discoveries N3035, Moscow, Zh-35, Rauschska nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

0

50

character. And .uk1loes Hy.uepMr-i uropy nm-holog of the screen.

Formula and 3 about the T r e n Tf

A square pulse generator containing a trigger with separate inputs, each arm of which is feedback-fed through an electronically controlled delay element, and a voltage source for controlling a frequency that differs in order to provide separate electronic control of the duty cycle and frequency , a voltage source for controlling the duty ratio, an inverter and two resistor voltage dividers are introduced into it, the control inputs of the delay elements are connected to the outputs of the first and second voltage dividers, n rvye vgoody which are connected to a voltage source for controlling the frequency and voltage source for controlling the duty cycle is coupled to the second terminal of the first voltage divider and via an inverter to the second terminal of the second voltage divider.

Claims (1)

Claim A rectangular pulse generator containing a trigger with separate inputs, each arm of which is feedback-coupled through an electronically controlled delay element, and a voltage source for controlling the frequency, characterized in that, in order to provide separate electronic control of the duty cycle and frequency, a source is introduced into it voltage for duty cycle control, an inverter and two resistor voltage dividers, the control inputs of the delay elements are connected to the outputs of the first and second voltage dividers, the first e terminals are connected to a voltage source for controlling the frequency and the voltage source for controlling the duty cycle is coupled to the second terminal of the first voltage divider and through an inverter - a second terminal of the second voltage divider. Proofreader A. Tyasco fi! f Compiled by E. Sapezhko