基本信息
摘要：953,594. Semi-conductor pulse circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. Oct. 6, 1961 [Oct. 11, 1960], No. 36025/61. Heading H3T. [Also in Division G4] A counter constructed from photoconductive and electroluminescent devices is shown in Fig. 3. The counter is primed by closing switch S, whereupon a flash of light from lamp NI illuminates photoconductor 20 and electroluminescent device 21 is energized from terminals 18, device 21 creating a holding circuit for itself by illuminating a photoconductor 22. Device 21 also primes the first stage of the counter proper by illuminating photoconductor 24. A pulse applied to terminals 38 energizes an electroluminescent strip 19 which is common to all stages of the counter, and device 25 is then energized through a further photoconductor 40 associated with strip 19. Device 25 creates a holding circuit for itself through photoconductor 26, extinguishes device 21 by creating a shunt path through a photoconductor 23, and primes the next stage 29 by illuminating photoconductor 28. The following stages operate in a similar manner. The counter may be used to control a stepvoltage generator, Fig. 1, forming a balancing voltage source in an analogue-to-digital converter. The unknown voltage is applied at X, and devices 23, 25, 29 . . . of Fig. 3 are represented in Fig. 1 by light sources L 0 -L 9 . Initially L 0 is energized and photoconductor R 0 supplies a balancing voltage of 0.1 volts from a 1-volt source B 1 . Assuming an input at X of 0.86 volts, difference amplifier M energizes a lamp A1 which in turn controls a relaxation oscillator, Fig. 2 (not shown) supplying pulses to terminals 38, Fig. 3. Sources L 0 -L 8 are energized in sequence by the counter to produce an increasing step voltage until the input X is exceeded. Amplifier M then extinguishes A1 and lights A2, the latter controlling a further pulse source and counter including electroluminescent devices L 0
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