SU947772A1

SU947772A1 - Device for measuring thyristor cut-on current

Info

Publication number: SU947772A1
Application number: SU802957622A
Authority: SU
Inventors: Владимир Игоревич Гуревич; Петр Ильич Савченко; Юрий Владимирович Жуковский
Original assignee: Харьковский Институт Механизации И Электрификации Сельского Хозяйства
Priority date: 1980-07-21
Filing date: 1980-07-21
Publication date: 1982-07-30

Description

(54) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ ТОКА .ОТПИРАНИЯ(54) DEVICE FOR MEASURING CURRENT. OPENING

ТИРИСТОРАTIRISTORA

Изобретение относитс к измерительной технике, в частности к приборам дл контрол параметров тиристоров .The invention relates to a measurement technique, in particular to devices for monitoring parameters of thyristors.

Известны устройства дл измерени тока отпирани тиристоров, содержащие источник посто нного напр жени , к положительному полюсу которого подключен анод тиристора, а к отрицательному - катод последовательно с нагрузочным резистором, между катодом и управл ющим электродом тиристора включен второй источник посто нного напр жени , значение которого может измен тьс , например, с помощью реостата, в цепь управл ющего электрода включен гальванометр, по которому считывают значение тока отпирани 1..There are known devices for measuring the thyristor unlocking current, containing a constant voltage source, to the thyristor anode of which is connected to the positive pole, and a cathode in series with the load resistor to the negative pole, a second voltage source connected between the cathode and the thyristor control electrode, may be changed, for example, by means of a rheostat, a galvanometer is connected to the control electrode circuit, from which the value of the unlock current 1 is read.

Недостатком этого устройства вл етс громоздкость из-за наличи двух отдельных источников посто нного напр жени , длительность процесса измерени , требующего как можно более медленного подъема напр жени на управл ющем электроде с помощью реостата, а также недостаточна точность при массовых измерени х, завис ща от субъективных ощущений опера-.The disadvantage of this device is cumbersome due to the presence of two separate sources of direct voltage, the duration of the measurement process, which requires the slowest voltage to be applied to the control electrode using a rheostat, as well as insufficient accuracy in mass measurements, depending on subjective sensations opera

тора и его реакции при фиксации момента отпирани .torus and its reaction when fixing the moment unlock.

. Цель изобретени - упрощение устройства .. The purpose of the invention is to simplify the device.

Поставленна цель достигаетс тем что в устройстве дл измерени тока отпирани тиристора, содержащем источник питани , к выходу которого последовательно к нагрузочным резис10 тором подключен испытываемый тиристор , а также измерительное устройство , источник питани выполнен в виде источника переменного синусоидального напр жени , а управл ющий элект15 род тиристора соединен через введенный резистор и диод с анодом тиристора , причем.измерительное устройство выполнено в виде амплитудного вольтметра.This goal is achieved by the fact that in the device for measuring the thyristor unlocking current containing a power source, to the output of which the test thyristor is connected to the load resistor, as well as the measuring device, the power source is designed as a source of alternating sinusoidal voltage the thyristor is connected through the inserted resistor and the diode to the thyristor anode, and the measuring device is designed as an amplitude voltmeter.

2020

На чертеже изображена схема устройства дл измерени тока отпирани тиристора.The drawing shows a diagram of a device for measuring a thyristor unlocking current.

Устройство содержит нагрузочный резистор 1, включенный последовательно The device contains a load resistor 1 connected in series

Claims

25 with the test thyristor 2 to the source 3 of an alternating sinusoidal voltage. The thyristor control electrode is connected to its anode through resistor 4 and diode 5. Parallel to resistor 4, a measuring device is connected, made in the form of an amplitude voltmeter containing diode 6, capacitor-7 and dial gauge 8 (or recorder). The device works as follows. When voltage is applied to positive half-periods, resistor 4 1 and diode 5 begins to flow a current of control ethenia, increasing sinusoidally, to the law, as long as it is not enough to unlock the thyristor

2. After that, the thyristor is unlocked and, by shunting the control circuit, removes the control signal. Thus, through the resistor 4 at the beginning of each positive half-period of the voltage of the source 3. a current pulse flows on it, causing a voltage drop across it to charge the capacitor 7. Diode b serves to prevent the capacitor from self-discharge through the resistor 4. Duration and amplitude the pulses will depend on the discharge current of the capacitor 7 flowing through the dial indicator 8 (recorder). The performed studies and calculations using the least squares method make it possible to reveal the dependence between readings of the dial gauge (Kot) and the actual unlock current () where A is the constant of the instrument, which depends on the specific parameters of the elements entering the device. For prototype instrument A 0.03955. In accordance with this dependence can be graduated scale dial gauge. Thus, due to the use of a variable sinusoidal voltage as the power source and the special switching on of the control electrode using an amplitude voltmeter, the device was significantly simplified and its cost was reduced. An apparatus for measuring a thyristor unlocking current, containing a power source, to the output of which a test thyristor is connected in series with a load resistor, as well as a measuring device, characterized in that, for the purpose of simplification, the power source is made in the form of a variable sinusoidal voltage source, and the control electrode of the thyristor is connected through an inserted resistor and a diode with the & NODOM of the thyristor, and the measuring device is designed as an amplitude voltmeter. Sources of information taken into account during the examination 1. V. Bardin. et al. Instrumentation and methods for monitoring parameters of power semiconductor valves, M., Energie, 1971, p. 184.