SU1495983A2 - Sawtooth voltage generator - Google Patents

Abstract

The invention relates to a pulse technique and can be used, for example, in personnel oscillators of a frame scan. The purpose of the invention is to enhance the functionality by allowing the output voltage range to be varied without changing the oscillation frequency. To do this, a variable resistor 14 and a key element 15 are introduced into the sawtooth generator (FPG). The FPG also contains resistors 1, 8, capacitors 2.9, operational amplifier 3, discharge device 5, voltage divider 6, pulse amplifier 7, block 10 fixing the signal level. 2 Il.

Description

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The invention relates to a pulse technique, can be used, for example, in the master oscillators of a frame sweep and is an improvement of the invention according to the author. St. No. 809518.

The aim of the invention is to expand the functionality by allowing the output voltage range to be varied without changing the oscillation frequency.

Figure 1 shows a structural electrical diagram of the generator; in figure 2

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blinders that show his work.

The sawtooth generator contains the first resistor 1, the first capacitor 2, the operating amplitude (3, the output of which through the first capacitor 2 is connected to its inverter 20 Tr1 input connected via

a resistor 1 with a power supply bus 4, a discharge device 5, for example; p, on transistors, connected parallel to the first capacitor 2, divider.5

voltage across resistors, first input

k) of which is connected to the output of the operational amplifier 3, the second input with a common bus, pulse amplifier 7 at the field effect T1, second resistor 30 V, the second capacitor 9, unit 10 for fixing the signal level, for example, on the capacitor 11 and the diode 12, which is connected to the bus 13, they are synchronizing pulses, and the output is to

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pulse amplifier code 7 on

the left transistor, the output of which is connected in parallel to the second resistor 8 And the second capacitor 9 is connected to the output of the voltage divider 6 on the resistors and to the input of the discharge device 5, variable resistor 14, key element 15, the control input of which is connected to the output of the pulse-amplifier 7 on the field - in a transistor, the output is with the first output of the variable resistor 14, the sub-live contact of which and the second output are connected to the output of the first resistor 1 and to the bus 4 of the power supply,

Generator sawtooth voltage works as follows.

In the presence of power and the absence of sync pulses, the generator operates in self-oscillatory mode. In this case, at the output of the operational amplifier 3, which is the generator output, a sawtooth

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2a. Discharge device 5 is turned on by output voltage from divider 6 when a certain level is reached. From the moment of switching on the discharge device 5, the first capacitor 2 is discharged to a potential close to zero, with a constant time determined by the capacitance of the capacitor 2 and the direct resistance of the discharge device 5. The latter closes from the time when the voltage at the output of the operational amplifier 3 decreases to The quantities at which the current flowing into the discharge device 5 is insufficient to keep it on. Capacitor 2 starts charging and the cycle repeats again. When the external clock pulses are lost, the amplifier 7 is set to zero potential, and the output of the key element 15 is the voltage of the power supply bus 4. In this case, the entire voltage of the power supply bus is applied to the time of the setting resistor 1.

With the input to the input unit 10 of the latching signal level of the external sync pulses (Fig. 26), the values of their vertices are fixed by means of a capacitor 11 and diode 12. At the same time, the voltage of the pulse amplifier 7 is removed (Fig. 2c), which is sync pulses has a polarity opposite to sawtooth. In this case, to switch on the discharge device 5 with a si. Unitary voltage (Fig. 2d), more than the unsynchronized mode, the value of the sawtooth voltage at the output of the operational amplifier is required, which corresponds to a decrease in the natural frequency of the generator.

The discharge device 5 is switched on by the voltage drop from the pulse amplifier 7, which coincides in phase with the front of the sync pulse. The second capacitor 9 r-produces the exact phasing of the output sawtooth (fig. 2e) with a synchronization pulse.

In the synchronized mode, at the output of the key element 15, there is a zero potential in the intervals between the clock pulses and the supply voltage during the action of the clock pulses. In this case, the voltage is removed from the resistor 14 (Fig. 2e), the value of which, depending on the location

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Claims (1)

Claim Sawtooth voltage generator No. 809518, characterized in that, in order to expand functionality by providing the ability to change the magnitude of the output voltage without changing the oscillation frequency, a variable resistor and a key element are introduced into it, the control input of which is connected to the output of the pulse amplifier on the field-effect transistor, the output is from the first Conclusion: the ability to expand functionality by means of limiting ^ the possibility of changing the magnitude of the output voltage with an unchanged applied resistor, a movable contact to orogo and a second terminal respectively connected to the terminal of the first resistor and a source of nutrition to the bus