SU604183A1 - Frame scanning sawtooth voltage shaper - Google Patents

Description

(54) FORMER FOR CUTTING VOLTAGE PERSONNEL SCAN

The invention relates to radio engineering and can be used in display indicators of alphanumeric information.

A shaper of a sawtooth voltage of a frame sweep is known, containing a capacitor, one of the plates of which is connected to ground, a first resistor, an amplifier made of a transistor to the base of which is connected to a generator, a second ristor is connected to the emitter circuit of the transistor on. “The ground, and into the collector circuit, two successive chains, one of which consists of the throttles, the third resistor and the source of constant voltage, and the other of the separation capacitor and the deflection of the coil 1.

The purpose of the invention is to increase the linearity of the sawtooth voltage.

For this, a frame sweep voltage driver containing a capacitor, one of the plates of which is connected to ground, the first resistor, an amplifier made of a transistor, is connected to the 40foporo base of the master oscillator, the second resistor is connected to the emitter circuit, one of the conclusions of which is connected to "the earth, and to the collector circuit -

two series of chains, one of which consists of a drossel, a third resistor and a source of constant voltage, and the other from an isolation capacitor and a deflecting roller, are connected to the collector circuit of the transistor a series of differentiating unit, a valve and a linear amplifier whose output is connected to the emitter of the transistor, to which the collector is connected in series the first resistor and the newly introduced diode, is connected to another capacitor plate.

FIG. 1 given the structural electrical circuit of the proposed device; in fig. 2 diagrams for the operation of the device.

The ramp saw driver contains a capacitor 1, one of the plates of which is connected to ground, the first resistor 2, an amplifier made of transistor 3, to the base of which the input of the master oscillator 4 is connected. The second resistor 5 is connected to the emitter circuit of transistor 3 from the terminals of which is connected to the "ground, and to the collector circuit, two successive chains, one of which consists of 6 drossel, the third resistor 7 and the constant voltage source 8, and the other from the separation capacitor 9 and

the deflecting coil 10, in the collector circuit of the transistor 3 is connected a series of differentiating unit P, valve 12 to the linear amplifier 13, the output of which is connected to the emitter of the transistor 3, to the collector of which are connected in series the first resistor 2 and the newly entered bottom 14 connected to other capacitor plate 1.

The device operates as follows: In the presence of a linearly reproducible oscillating voltage of the master oscillator 4 1 1 in the base of the transistor 3, a sawtooth current flows through the coil 15. In the absence of a signal from the generator 16, a sawtooth current can be obtained in the coil 15 with nonlinearity. best 5%.

When the signals of both generators 4 and 6 are turned on, exponential distortions appear at the beginning of the forward run of the vertical current. A voltage acts on the collector of the transistor 3 (see the curve in FIG. 2). At the output of the differentiating unit 11, a voltage (see curve in Fig. 2) is applied, which is applied to the input of the valve 12. The valve 12 passes to the input of the linear amplifier 13 voltage pulses of only negative polarity (see the curve in Fig. 2), corresponding to the beginning of the forward stroke. These voltage pulses are converted by a linear amplifier 13 into a current varying according to curve g (see Fig. 2). The emitter current of the transistor can be determined

.about,

where V is the value of the output voltage of the master oscillator 4 from peak to peak; Rs is the resistance of the second resistor 5; 1Vm-output current of the linear amplifier 13.

The voltage A (see Fig. 2) represents the emitter current of the transistor 3 before the linear amplifier 13 is introduced into it. From a comparison of the curves and A (see Fig. 2), it is seen that the exponential part of the curve A: is increasing, and the curve is falling. ;

Thus, in the proposed device, the linearity of the sawtooth voltage is better.

Claims (1)

Invention Formula A raster sweep voltage driver that contains a capacitor, one of the plates of which is connected to ground, the first resistor, an amplifier made on a transistor to the base of which is connected to the input of the master oscillator, is connected to the emitter circuit of the transistor and the second resistor "Ground, and into the collector circuit, two successive circuits, one of which consists of the throttles, the third resistor and the source of constant voltage, and the other of the separation capacitor and coil, characterized in that, in order to increase the linearity of the sawtooth voltage, a series of differentiating unit, valve and linear amplifier whose output is connected to the emitter of the transistor, the collector of which is connected in series with the first resistor and newly introduced, is connected to the collector voltage of the transistor. a diode connected to another capacitor plate. Sources of information taken into account in the examination: I. Tikhomirov V. S. Kadrova sweep on transistors. M., “Energie, 1968, p. 41, Fig. 23.