基于KT系列芯片的钻孔成像仪探头电路设计

The probe circuit design of drilling imager based on KT series chip

针对钻孔成像仪在小孔径、无自然光钻孔内应用的实际工况环境,进行了钻孔成像仪探头稳压电路、光源驱动电路和灯板电路的需求分析与设计。从实际需求出发,设计了基于KTB8370芯片的稳压电路、基于KTD3113芯片的LED光源驱动电路,同时,考虑到钻孔内无自然光且空间狭小的情况,灯板电路选择了照射范围小,但照射距离远的高亮白色直插型LED作为照明光源。实验室测试及现场试验结果表明,设计的稳压电路与光源驱动电路连续长时间运行无故障,5 V输出电压误差为1.04%,3.3 V输出电压误差为0.88%,灯板工作电流仅为15 mA,电路工作稳定、运行可靠、技术参数符合设计要求;灯板光源照度达到3 196 Lux,满足探头照明需求。经现场试验测试,钻孔内壁及裂隙水清晰可见,表明电路设计与实现符合预期。

According to the actual working conditions of drilling imager used in small aperture without natural light,the probe voltage regulator circuit,light source driving circuit and lamp board circuit of drilling imager are analyzed and designed.According to the actual demand,the voltage regulator circuit based on KTB8370 chip and the LED light driver circuit based on KTD3113 chip are designed.At the same time,considering that there is no natural light in the drilling hole and the space is narrow,the lamp board circuit chooses the bright white LED with a small irradiation range but a long irradiation distance as the lighting source.Laboratory test and field test results show that:the designed voltage regulator circuit and the light source drive circuit run continuously for a long time without fault,the output voltage error of 5 V is 1.04%,the output voltage error of 3.3 V is 0.88%,and the working current of the lamp board is only 15 mA.the circuit works stably and reliably,and the technical parameters meet the design requirements.The illuminance of the light source of the lamp board reaches 3 196 Lux,which meets the requirement of the probe lighting.Through the field test,the inner wall of borehole and the crack water can be clearly seen,which indicates that the circuit design and implementation meet the expectation.