SU545929A1

SU545929A1 - Dc to ac converter

Info

Publication number: SU545929A1
Application number: SU1723885A
Authority: SU
Inventors: Владимир Ильич Турченков
Original assignee: Владимир Ильич Турченков
Priority date: 1971-12-10
Filing date: 1971-12-10
Publication date: 1977-02-05

Description

1one

Из0бретен:ие относитс к импульсной технике , может быть дспользавано в измерительной технике в качестве преобразовател высоковольтного напр жени в пропорциональное ему низ|КО,вольтное напр жение с их гальванической разв зкой дл замеров токов утечки в цеп х высоковольтных напр же;|ий с гальва 1ической разв зной измерительного прибора и в устройствах автоматил н - дл преобразовани тока в частоту импульсов, в качестве порогового сигнализатора о достижении входны;м напр жением своего зада;- ного значени , в качестве устройства контрол состо ни тиристоров (В(Ключен илн выключен ) и в р де других случаев, например, в реле времени как элемент, обеспечивающий заданное значение времени формировани Импульса :после подачки на него входного напр жени ().This is not related to a pulse technique, it can be used in measuring equipment as a high-voltage converter to a proportional low | K, voltage with its galvanic isolation for measuring leakage currents in high-voltage circuits; | with a galvanic voltage The first and foremost measuring instrument and in devices of automatons — to convert the current into a pulse frequency, as a threshold indicator of the achievement of the inputs, the voltage of its set point, as a device control of the state of the thyristors (B (Klyuchen or ill), and in a number of other cases, for example, in a time relay as an element that provides a predetermined value of the pulse formation time: after supplying the input voltage to it ().

Известны устройства, преобразующие посто нный ток в аеременный, содержащие трансформатор с несколькими обмотха.ми.Devices are known that convert direct current to alternate current and contain a transformer with several windings.

Однако в таких устройствах мал диапазон изменени частоты.However, in such devices, the frequency range is small.

Известны также .преобразователи посто нного тока в переменный, содержащие транзисторный автогенератор с эмиттерно-коллекторной трансформаторной положительной обратной св зью и .конденсатор, подключенный лараллельно входу устройства и выводам эмиттерной и коллекторной обмотол трансфорлк тора .DC-to-AC converters are also known, which contain a transistor oscillator with an emitter-collector transformer positive feedback and a capacitor connected to the device and the terminals of the emitter and collector winding of the transformer.

Однако у этих преобразователей мала мощность выходных импульсов.However, these converters have low output pulse power.

Цель (Изобретени - повыщение выходной мощности - достигаетс тем, что в преобра зователе, содержащем транзисторный автогенератор с эмиттерно-колЛвкторной трансформаторной положительной обратной св зью и конденсатор, подключенный параллельно .входу устройства :н выводал эмиттерной и коллекторной обмоток трансформатора между базой транзистора и обкладкой конденсатора , соединенной с коллекторной обмоткой трансформатора, .включен элемент с нелинейч ной вольтамперной характеристикой, напри-: мер стабилитрон.Purpose (Inventions - boosting output power - is achieved by the fact that in a converter containing a transistor oscillator with emitter-collar transformer positive feedback and a capacitor connected in parallel to the device input: n outputting the emitter and collector windings of the transformer between the base of the transistor and the capacitor plate connected to the collector winding of the transformer. an element with a non-linear current-voltage characteristic is included, for example, a zener diode.

На чертеже представлена схсма устройства .The drawing shows the device schema.

Преобразователь содержит источник тока i, «оиденсатор 2, трансформатор 3 с эмиттерной и коллекторной обмотками 4 :и 5, транзистор 6, элемент 7 с нелинейной вольта. .характеристикой, пик-детектор 8. Источник тока / содержит источни,к напр же П1 9, резистор 10.The Converter contains a current source i, “Odensor 2, a transformer 3 with emitter and collector windings 4: and 5, a transistor 6, an element 7 with a non-linear volt. , peak detector 8. The current source / contains sources, for example, P1 9, resistor 10.

Claims

When the voltage on the capacitor 2 becomes equal; 10 to the voltage of the beginning of the conduction of the element 7 and the voltage of the conduction of the transistor base-emulator transition b. through about 4 n 5 of transformer 3, a current begins to flow, as a result of which a regenerative process begins, during which the capacitor 2 is discharged, and a pulse with an amplitude, ampere, is formed on the collector of the transistor. The output pulse is frozen due to the fact that before the start of the regenerative process, capacitor 2 is charged to a larger capacity and, accordingly, gives most of the energy to the load during the regenerative process, the faster the input current will be, The magnitude of the breakdown of the Zener diode, the more pulses are generated per unit of time. The frequency dependence of AND (mpulsa versus source current amplitude, ka / strictly linear over a wide frequency range. Output pulses can be removed from the collector of transistor 6 or from the output winding of the transformer 3, pO | If the output signal is removed through the picdetector 8, the amplitude of the output voltage or current will be proportional to the input current, since with the input current, the number IM1pulso is greater; d. If the input of the converter is supplied with voltage from source 9 with series-connected resistors 10, then when this voltage is less than the voltage of the breakdown of element 7, the pulses at the output of the loop, and when it is greater, the output signals are generated at the output. the driving voltage of the job level. This property of the converter is used in various threshold circuits of automation devices. The converter can be used directly in the sources of direct current, the wiring of which exceeds anytime the voltage of the transistor 6 due to the low input differential 0 of its resistance of the converter. Due to the positive feedback through trasigor1mat10p, the increased sensitivity of the circuit is achieved, i.e., at the output of the form, pulses are generated at small values of current (fraction of microamler), and as the upper limit of the transistor is limited, then The output frequency of the output frequencies can be smoothly controlled by changing the input current by three n or more orders of magnitude, for example, with the same circuit elements, a change in frequency from fractions of a hertz to one hundred kilohertz was obtained. The converter can also be used in a time relay as an element of a time setting from tens; minutes to fractions of seconds) T due to the fact that when an input is applied by an abrupt current OR voltage, the output impulse is formed after a certain time when the voltage on the capacitor reaches threshold of the stabilitron. The converter can also be used as a generator of the sawtooth i; instructions, if the output signal is removed from the con; sator with regulatory frequency of power. Claims of the Inverter DC to AC converter containing a transistor oscillator with an emitter-collector transformer positive feedback and a capacitor connected in parallel to the input of the device: both the terminals of the emitter and collector windings of the transformer are distinguished by the fact that iC has the purpose of increasing the output power, between the base of the transistor and the capacitor plate connected to the collector winding of the transformer, includes an element with a nonlinear current-voltage characteristic, for example zener diode.