一台昆仑18英寸彩电经常发生行管被击穿。行管被击穿的主要原因是逆程脉冲幅值升高引起的,而逆程脉冲幅值为(πEc)/2((Th)/(Tr)-1) 从上式可以看出,逆程脉冲幅值升高有三个因素: 1.逆程脉冲幅值与电源电压成正比,Ec越大,逆程脉冲幅值越大。 2.当行周期Th一定时,逆程扫描时间Tr减小。导致逆程脉冲幅值增加,而逆程扫描的时间的减 A Kunlun 18-inch color TV sets are often punctured. The breakdown of the tube is mainly caused by the increase of the pulse amplitude of the reverse pulse, and the amplitude of the pulse of the reverse pulse is (πEc) / 2 ((Th) / (Tr) -1) As can be seen from the above formula, Pulse pulse amplitude increased three factors: 1. The reverse pulse amplitude and the power supply voltage is proportional to the greater the Ec, the greater the reverse pulse amplitude. 2. When the line cycle Th is constant, the reverse scan time Tr decreases. Resulting in an increase in the amplitude of the reverse pulse, while the inverse of the time of the scan