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PCB設計之單片機控制板設計原則

时间：2020-08-16 【转载】阅读

據不完全統計，我國每年因漏電而引起的觸電事故、火災造成數千人死亡和數十億的經濟損失，因此對可以防止漏電火災及人身觸電保護的漏電保護器的性能提出了更高的要求。本文介紹的漏電保護器動作特性自動測試系統，可測量漏電保護器的漏電動作電流值、分斷時間和漏電不動作電流值，對提高漏電保護器工作的可靠性提供了主要技術參數，檢測過程具有較高的自動化水平，可對在線運行與非在線運行的漏電保護器進行檢測。

　　系統以LPC2132爲核心，具有擴展測試電流的産生和調節模塊、動作執行單元、電流檢測電路以及鍵盤等外圍設備。LPC2132是一個支持實時仿真和跟蹤32位ARM7TDMI-S核的微控制器，1個10位8路A/D轉換器，2個32位定時器/計數器，6路PWM單元輸出，2個硬件I2C接口和47個 GPIO，2個16C550工業標准UART，以及多達9個邊沿或電平觸發的外部中斷。16kB的片內靜態RAM和64kB的片內Flash程序存儲器避免了LPC2132外擴存儲器，簡化了電路，提高了運行速度。

測試電流産生和調節模塊如圖2所示。測試電流的産生是將50Hz、220V的正弦交流電經過220：12的降壓變

上一篇PCB設計：如何減少錯誤並提高效率下一篇PCB設計示波器使用應當注意的幹擾因素

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