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为解决传统紫外光能量计所存在的功耗大、成本高、精度低以及设计复杂等问题,提出一种基于双补偿机制的电流积分型低功耗紫外能量检测方案。该方案利用低功耗单片机实现对紫外光能量的计算;紫外光电探测器输出的电流通过电流积分模块转换为方波脉冲;放电补偿电路和环境光补偿电路对电流积分模块进行误差校正,提高检测精度;主控制器对脉冲数进行统计,计算能量大小;充分利用低功耗模式优化显示程序,显示程序不使用芯片驱动,而是采用微处理器直接驱动,使显示程序的功耗进一步降低。实验证明:该方案功耗不超过165μW,对紫外光能量值的检测误差小于1%,电路复杂度低,使用芯片成本低,具有很强的续航能力和很高的实用价值。
In order to solve the problems of large power consumption, high cost, low precision and complicated design of traditional UV energy meters, a current-integrated low-power UV energy detection scheme based on double compensation is proposed. The scheme uses the low-power single-chip microcomputer to realize the calculation of the ultraviolet energy; the output current of the ultraviolet photodetector is converted into a square wave pulse by the current integral module; the error compensation of the current integral module is performed by the discharge compensation circuit and the ambient light compensation circuit, Accuracy; the main controller of the pulse number statistics, calculate the energy size; make full use of low-power mode optimization display program, display program does not use the chip driver, but the microprocessor directly drives the display program to further reduce the power consumption. Experiments show that the power consumption of this scheme does not exceed 165μW, the detection error of UV energy is less than 1%, the circuit complexity is low, the cost of using chip is low, and the battery has high endurance and high practical value.