温差发电协同储能元件驱动LED车灯的响应特性

Response characteristics of LED car lamps driven by thermoelectric generator and energy storage components

为实现低品位能源的高效利用,构建了基于温差发电的余热回收系统将余热转化为电能,用以驱动发光二极管(light emitting diodes,LED)车灯点亮.利用恒温加热炉模拟热源,探究了余热回收系统在不同阶段能量转化和驱动LED车灯的响应特性.在实际应用中,研究了储能元件独立驱动LED车灯时光输出特性的变化规律.结果表明:储能元件可以存储回收余热所转化的电能,并独立驱动LED车灯工作,还能缓冲温度变化引起的电压波动;锂电池的能量密度高,可储存更多电能,独立驱动LED车灯时冷启动速度快,点亮时间更长,但充满电所需时间也较长;超级电容冷启动速度慢,但充放电速度较快,有助于余热回收系统短时间工作时缓解LED车灯的驱动电压波动.

A waste heat recovery system with thermoelectric generation was constructed to convert waste heat into electrical energy for powering light emitting diodes(LED)car lamps and enhancing the efficient utilization of low-grade energy.The response characteristics of the waste heat recovery system during different stages of energy conversion and LED car lamp operation were examined with the constant temperature heating furnace to replicate the heat source.The variations in light output characteristics of LED car lamps independently driven by energy storage components were investigated in practical scenarios.The results show that the energy storage component can efficiently store and recover electric energy from waste heat,operate an LED car lamp independently and mitigate voltage fluctuations resulting from temperature changes.The energy density of lithium batteries is high with storing substantial electric energy.The fast cold start speeds can be realized with extended lighting duration when the LED car lamps are drived independently,but the charging time is longer.The cold start speeds of supercapacitors are sluggish with rapid charging and discharging rates,which is helpful to alleviate the driving voltage fluctuation of LED car lamp when the waste heat recovery system is activated briefly.