SU955409A1

SU955409A1 - Triac switching device

Info

Publication number: SU955409A1
Application number: SU782683484A
Authority: SU
Inventors: Вячеслав Федорович Соколов
Original assignee: Харьковский институт инженеров коммунального строительства
Priority date: 1978-11-10
Filing date: 1978-11-10
Publication date: 1982-08-30

Description

Изобретение относитс к преобразовательной технике и может быть использовано в качестве формировател отпирающих импульсов дл включени симистора .The invention relates to a converter technique and can be used as a trigger pulse driver for switching on a triac.

Известно устройство дл включени симистора, содержащее генератор импульсов , подключенный через разделительный трансформатор к управл ющему электроду симистора 11.A device for switching on a triac containing a pulse generator connected through an isolation transformer to the control electrode of the triac 11 is known.

Недостатком известного устройства вл етс многократное включение симистора .A disadvantage of the known device is the multiple switching on of the triac.

Наиболее близким к предлагаемому по технической сущности ц достигаемому результату вл етс устройство дл включени симистора, содержацее тиристорный ключ, подключенный к цепи управлени симистора, накопительный конденсатор, вспомогательный тиристор , диод и разделительный трансформатор , вторична обмотка которого содержит среднюю точку t2.The closest to the proposed technical essence of the achieved result is a device for switching on a triac, containing a thyristor switch connected to a triac control circuit, a storage capacitor, auxiliary thyristor, a diode and an isolation transformer whose secondary winding contains a midpoint t2.

Известное устройство не обеспечивает однократного включени симистора при любой пол рности напр жени сети.The known device does not provide a single switching on of the triac for any polarity of the mains voltage.

Цель изобретени - - однократное включение симистора при любой пол рности напр жени сети.The purpose of the invention is to turn on the triac once for any polarity of the mains voltage.

Поставленна цель достигаетс тем, что устройство дл включени симистора снабжено двухполюсным переключателем с нейтральным положением, трансформатором тока дл подключени к цепи нагрузки и выпр мителей, причем первична обмотка трансформатора подключена к питающей сети через двухполюсный переключатель с нейтральньл 1 The goal is achieved by the fact that the device for switching on the triac is equipped with a bipolar switch with a neutral position, a current transformer for connection to the load circuit and rectifiers, the primary winding of the transformer being connected to the mains through a bipolar switch with neutral 1

10 положением, один конец вторичной обмотки разделительного трансформатора подключен к управл ющему электроду симистора, а второй - через диод к одной обкладке накопительного конден15 сатора, котора через резистор подключена к аноду вспомогательного тиристора и управл ющему электроду тиристора, анод которого подключен к катоду симистора , а катод - к катоду вспомога20 тельного тиристора, второй обкладке конденсатора и средней точке вторичной обмотки разделительного трансформатора , трансформатор тока выходом подключен к выпр мителю, положитель25 ный полюс которого подключен к управл ющему электроду, а отрицательный к катоду вспомогательного тиристора.10 position, one end of the secondary winding of the isolation transformer is connected to the control electrode of the triac, and the other through a diode to one plate of the storage capacitor, which through a resistor is connected to the anode of the auxiliary thyristor and the control electrode of the thyristor, the anode of which is connected to the cathode of the triac, and the cathode - to the cathode of the auxiliary thyristor, the second capacitor plate and the midpoint of the secondary winding of the isolation transformer; the output current transformer is connected to the rectifier The positive pole of which is connected to the control electrode and negative to the cathode of the auxiliary thyristor.

На черт же изображено устройство The devil shows the device

Claims

30 to turn on the triac. The device contains triac 1, load 2, separation transformer 3 with primary 4 and secondary 5 and b windings, two-pole switch 7 with neutral position, diode 8, storage capacitor 9, resistor 10, thyristor 11, integrated thyristor 12, rectifier 13 and a current transformer 14. The proposed device works as follows. When a bipolar switch 7 is installed, an electromotive force appears on one of the positions (for example, the top) on the secondary winding of transformer 3, and the device starts working when a positive potential appears on the anode of diode 8. The positive potential from the cathode of the diode 8 through the resistor 10 is supplied to the control transition of the thyristor 11, while the thyristor 11 remains closed, since the negative voltage of the transformer secondary section 5 is applied to it. However, the supply of the control signal to the thyristor 11 lasts until the beginning of the next half-period due to the energy of the capacitor 9. When the half-sign of the power supply is relieved by pre-supplying the control signal to the thyristor 11, current is supplied to the control transistor of the triac 1. unlocks and flows according to load 2. the current that is fixed by the current transformer 14 and through the rectifying bridge 13 is supplied to the control electrode of the auxiliary thyristor 12, which, by unlocking, shunts the control circuit of the thyristor 11. Simulator 1, passing one half of the operating current when zero current passes through zero, is locked . Setting the bipolar switch 7 to the neutral position returns the device to its original position. Switching the bipolar switch 7 to another position (lower) allows the working current half-wave to flow opposite the polarity through the load, while the operation of the circuit is similar to the previous switch-and-switch 7. The polarity of the working current half-wave depends on the polarity of the secondary windings 5 and 6 transformer 3 with respect to the power supply poles. The use of the invention allows the triac to be unlocked once for any polarity of the mains voltage. The invention includes a thyristor, a storage capacitor, an auxiliary thyristor, a diode, a resistor and an isolation transformer, the secondary winding of which contains a midpoint, characterized in that, for the purpose of a single connection, it is equipped with a double-pole switch with a neutral position, a current transformer for connection to the load circuit and a rectifier, the primary winding of the isolation transformer is intended to be connected to the mains through two pole switch with a neutral position, one end of the secondary winding of the isolation transformer is designed to be connected to the control electrode of the triac, and the other through a diode to one plate of the storage capacitor, which is connected through a resistor to the anode of the auxiliary thyristor and to the control electrode for connection to the cathode of the triac, cathode to the cathode of the auxiliary thyristor, the second capacitor plate and the middle point of the secondary winding separator th transformer, a current transformer output is connected to the rectifier, the positive pole of which is connected to the control electrode and the negative - to the cathode of the auxiliary thyristor. Sources of information taken into account in the examination 1. Thyristors. Technical reference. M., Energie, 1971, p. 179.

2. SCR Manual fifth Edition General Electrik USA Electronics Park Syracuse, No. 4, 13201, 1972, p. 314-315.