SU738124A1 - Sawtooth voltage generator with inductive load - Google Patents

Description

(54) CURRENT GENERATOR WITH INDUCTIVE

LOADING

The invention relates to a pulsed communication technique and can be used, for example, in the scanning devices of television television cameras. Sawtooth current generators are known, which are used as unwrapping devices (with auto-tuning of its mode of operation), containing units for generating and allocating reference and measuring signals, processing units for signals and receiving control and regulating voltages. The reference signals are formed using photoelectric or electrical circuits, the outputs of which are connected to the phase-matching device of right-angle impulses, and the output of the comparison device is connected to the output-signal adjustment device of the generator Signal made in the form of interconnected two generators a sawtooth signal and a peak detector; the outputs of the peak detectors are connected to the output amplifier of the control device 1. The disadvantage of this expanding device is that it provides for the use of complex and cumbersome gating logic circuits, which leads to an increase in the size, mass and cost of the device and the transmission chamber as a whole. Closest to the invention, by its technical nature, a sawtooth current generator with inductive load 2, comprising a master oscillator, a power amplifier, an output signal parameter control device, control signal selection units, the inputs of which are connected to the outputs of the pulse selector, and the outputs to a comparison device. Trigger clock pulses are also connected to this device. The output of the comparison device through the voltage regulating amplifier is connected respectively to the devices for adjusting the constant component and the sweep of the output signal of the sweep generator. The disadvantage of this device is that in order to obtain reference signals, it is necessary to use additional special devices in the optoelectric part of the camera transmission, which leads to the loss of a significant part of the frame field on the target of the transmitting tube and complicates the device of the transmitting chamber as a whole. In addition, it does not provide high accuracy auto-tuning mode of operation. The purpose of the invention is to increase the accuracy of the auto tuning of the operation of the sawtooth TOka generator ... The goal is achieved by the fact that a generator of a sawtooth turner has an inductive load, which contains a master oscillator, a power amplifier, devices for adjusting the constant component and the amplitude of the generator output signal, and an amplifier. The output of which is connected to the input of the dc adjusting device, and the pulse output device, triggers, elements AND, clock pulse generator, counters, digital-to-analog converters, command sensor, inverter, and d-driver are introduced. ny amplifier. The inputs of the first and Btdporo triggers are connected to the outputs of the selector, the outputs of the same triggers, respectively, with the first inputs of the first and second element I, the second inputs of which are connected to the output of the clock generator, the outputs of the same elements And, respectively with the first inputs of the counters, the second inputs which are connected to the first output of the command sensor. The outputs are the same; the counters are connected respectively to the inputs of the first and second digital-to-analog converters, the output of the first digital-to-analog converter is with the inputs of an additional amplifier and inverter, the outputs of which are connected respectively to the first input of the amplitude control device and the first input of the comparator, the output of the second digital-to-analog converter to the second input device comparison. In addition, the sensor inputs of the commands are connected to the output of the selector, and the second output of the same sensor is connected to the second input of the device for adjusting the constant component. The structural electrical circuit of the sawtooth current generator with inductive load is shown in the drawing. A sawtooth current generator with inductive load contains a master oscillator 1, a power amplifier 2, devices for adjusting a constant component 3 and an amplitude 4 for an output signal, blocks 5, 6 for extracting control signals, which are connected to the outputs of the pulse selector (not shown) . Each block 5, 6 contains sequentially connected trigger 7, element 8, pulse counter 9 and digital-to-analog converter 10. Second inputs of elements 8 of blocks 5 and b are connected to the outputs of the generator pulses, for example, quartz. Device738124. The device also includes an amplifier 12, an inverter 13, a comparison unit 14, an additional amplifier 15 and a command sensor 16. The sawtooth generator operates as follows. When the clock pulse commands preceding the control sweep line arrive at the input of the sensor J6, the sensor 16 is triggered and the signal on one of its output of the counter 9 impulses blocks 5, 6 is reset, the device prepares for an auto-tuning cycle. When a sync pulse command arrives at the input 16 of the sensor at another output of sensor 16, a control signal appears, a line in the form of a sharp voltage drop. This voltage controls the output signal amplitude adjustment device 4 (for example, via the power supply) sweep generator operation mode. The amplitude of the generator output signal is changed so that the length of the line forming the control line increases - and two components of the control signals appear in the video signal — the reference and the current corresponding to the position of the line ends on the left and right of the raster. These components are selected by the pulse selector and control the voltage at the inputs of the blocks 5, 6. The triggers 7 in the blocks 5, 6 convert the intervals between the components of the control signals into pulses, c. according to which the elements And 8 connected to the generator 11, form two unequal packs of pulses. These pulses are recalculated by the counters 9, and at the outputs of the digital-to-analog converters 10 there appear to be equivalent voltages. They are compared in block 14, and at its output and, accordingly, at the output of additional amplifier 15, an auto-tuning signal appears, which controls the constant-frequency adjusting device 3 of the generator output signal, so that the generator output signal is decreasing. The cycle of auto-tuning occurs until (over several lines) the time intervals between the components of the control signals at the input of the selector and, respectively, at the inputs of the blocks 5, 6 of the device equalize. Line 1 at the outputs of digital to analogue converters 10 is also aligned. By the end of the auto-tuning cycle, the output voltage, amplifier 12 of unit 5, is adjusted and is set to a certain value. It controls the operation of the device 4 for adjusting the amplitude of the generator output signal during the next ts} scrapping of the raster row auto-tuning, maintaining the amplitude of the output signal constant After the auto-tuning cycle, the decoder in the command sensor 16 turns off, the control line's signal disappears and at the device output 4 adjustments of the output signal is set to a normal adjusted value {voltage, followed by 1no, the reference components of the control signals disappear in the video signal, and with them the signals at the input locks 5, 6. Schetchzzh slash in the sensor 16 for detecting torque at the next control signal line and is preceded. After this point, the auto-tuning cycle repeats. The presence in the proposed device of blocks 5, 6, implemented in the form of a digital meter converter time interval - code - voltage and one comparison device, allows you to flexibly control the voltage at the inputs of the amplitude adjustment device and the constant component of the input generator of the sweep. This ensures higher speed and accuracy of auto-tuning of the operating mode of the sweep generator. Mula of the invention. A sawtooth current generator with inductive load, containing a master oscillator, a power amplifier, devices for adjusting the constant component and amplitude of the output signal of the generator, an amplifier whose output is connected to the input of the device for adjusting the constant component, and a pulse selector differing in that, with a tseyuyu ensured tososhvt auto-podstrokkky mode of operation of devices aj triggers are entered into it, the elements And, a clock pulse, counters A team, and iggoertor dopolnitelyp br amplifier, with inputs of the first and second flip-flops with a compound vthodami selector outputs. the same triggers connect, respectively, with the first inputs of the first and second element I, the second inputs of which are connected to the generator input of the tapping pulses, the outputs of the same elements AND connected to the first inputs of the counters, the second inputs. which are connected to the first input of the command sensor, the output of the same meters is connected correspondingly to the inputs of the first and second digital-to-voltage converters, and the output of the first digital-analog converter is connected to the inputs of the additional amplifier and inverter, the outputs are connected to the first input of the amplitude control device and the first input of the device comparison, the input of the second digital-to-analog converter of the connections with the reference converter, in addition, the sensor inputs of the commands Connected to the overhead collector and the second output of the amp & the sensor to the second input of the constant-adjustment device. . The source of information taken into account in the examination 1. British Patent N 1091170 South. H 4 F, 15.11.67. 2. The patent of Germany G 1290575, cl. 21 a 34/04, 10/23/69 (prototype) ...

   . - h

./. - -.

738124

Claims (1)

The claims ₂₅ A sawtooth current generator with an inductive load, comprising a master oscillator, a power amplifier, devices for adjusting the constant component and the amplitude of a single generator signal, an amplifier ', the output of which is connected to the input of the device for adjusting the constant component, and a pulse selector, characterized in that, in order to ensure the accuracy of the automatic mode of operation of the device, triggers, AND elements, a clock generator, counters, digital-to-analog converters, a command sensor, inverto are introduced into it p and an additional amplifier, and the inputs of the first and second triggers are connected to the outputs of the selector, outputs. the same triggers are connected respectively to the first inputs of the first and second elements And, the second inputs of which are connected to the output of the clock generator, the outputs of the same elements And are connected respectively to the first inputs of the counters, the second inputs of which are connected to the first output of the command sensor, the output of the same counters connected respectively to the inputs of the first and second digital-to-analog converters, and the output of the first digital-to-analog converter is connected to the inputs of an additional amplifier and inverter, the output which are connected respectively to the first input of the amplitude control device and the first input of the comparison device, the output of the second digital-to-analog converter is connected to the second 'yhbda' of the comparison device, in addition, the input of the command sensor is connected to the output of the selector, and the second output of the same sensor to the second input of the device DC adjustments.