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KC-400型X射线机计时器为同步限时电路,它除采用闸流管限时电路及所必须具备的RC电路外,还增加一个单边移相器。利用移相器将闸流管控制栅极电压移相θ角,使闸流管可在屏压很低的条件下得到启燃,减少高压接触器在接通和切断瞬间的负载电流,防止电涌的产生,达到保护高压继电器和高压部件的目的。我院一九七一年开始使用国产KC-400型X射线诊断机。在使用过程中出现闸流管衰老快(平均三个月须更换一对闸流管),自行起辉切断高压,致使无X线产生。用新管
KC-400 X-ray machine timer for the synchronization circuit, in addition to its use of the thyristor circuit and the circuit must have RC circuit, but also to add a unilateral phase shifter. The use of phase shifter thyristor control gate voltage phase shift angle θ, so that the thyristor tube can be very low under the conditions of the screen to get the fire, reducing high-voltage contactor in the turn-on and turn off the load current to prevent electricity Chung produced, to protect high-voltage relays and high-voltage components purposes. Our hospital began using the domestic KC-400 X-ray diagnostic machine in 1971. Thyristor appears in the process of aging fast (an average of three months to be replaced by a pair of thyratron), self-induced cut off the high-pressure, resulting in no X-ray. With a new tube