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Find the value of the charging resistor in case of a UJT firing circuit with firing frequency of 2 kHz, C = 0.04 μF, η = 0.72

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Find the value of the charging resistor in case of a UJT firing circuit with firing frequency of 2 kHz, C = 0.04 μF, η = 0.72

(a) 5.62 kΩ

(b) 37 kΩ

(c) 4.23 kΩ

(d) 9.82  kΩ

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This key question is from Firing Circuits-3 topic in section Other Circuits of Power Electronics

1 Answer

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by (45.1k points)
The correct choice is (d) 9.82  kΩ

Explanation: T = 1/f = 1/2 kHz

R = T/C ln(1/1-η).

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