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研制了一款具有强驱动电流且能稳定工作的光电耦合器芯片,其中含有欠压锁存电路、逻辑控制模块以及后级的Push-Pull驱动电路。详细分析了欠压锁存(UVLO)及逻辑控制模块的工作原理,并以此为基础对整体外围电路进行仿真,仿真驱动电流达到3A以上。实测结果表明,当电源电压为30V、测试温度为25℃时,芯片正向峰值电流可达2.8A,负向驱动电流峰值可达2.5A,满足系统设计指标,适用于大型电力电子工业系统中。
Developed a photocoupler chip with strong drive current and stable operation, including under-voltage latch circuit, logic control module and the Push-Pull driver circuit. The working principle of undervoltage lockout (UVLO) and logic control module is analyzed in detail. Based on this, the overall peripheral circuit is simulated and the driving current is simulated to be above 3A. The measured results show that when the power supply voltage is 30V and the test temperature is 25 ℃, the chip forward peak current can reach 2.8A and the negative drive current peak can reach 2.5A, which meets the system design specifications and is suitable for large power electronic industrial systems .