POWER BLOCK OF THE BLACK AND WHITE CCTV

摘要

A power source block of black and white CCTV in which the noise is not generated at image signal period is provided to generate switching noise without noise at image signal period by operating power block using horizontal synchronization signal used in the CCTV. A first voltage regulator(211) produces the first output voltage by using the input power source. A second voltage regulator(212) produces the second output voltage by using the input power source. A charge pump upper transformer(213) produces the third output voltage by using the input power source in response to the synchronizing signal. A charge pump shifter(216) produces the fourth output voltage by using the input power source in response to the synchronizing signal. The synchronizing signal is the horizontal synchronization signal of the video signal used in the digital block. The digital block processes the digital image information of black and white CCTV inside.