本文選題：低損耗　切入點：開關(guān)電源　出處：《華南理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：開關(guān)電源輕巧及高高效的特點優(yōu)點，可以用于各個領(lǐng)域。開關(guān)電源的功耗由開關(guān)功率管損耗、開關(guān)變壓器損耗、整流管損耗及其它輔助電路損耗組成。由于開關(guān)功率管損耗在整個電源的損耗中所占的比重最大，本設(shè)計著重于利用軟開關(guān)電路降低開關(guān)管的損耗，從而提升開關(guān)電源的整體效率。將這種軟開關(guān)技術(shù)應(yīng)用到LED(Light Emitting Diode)驅(qū)動，提升LED電源的整體效率。 利用電容電感的諧振技術(shù)，通過變壓器的漏感及開關(guān)管并聯(lián)電容，為即將開通的功率開關(guān)管提供零電壓導(dǎo)通的條件而實現(xiàn)了軟開關(guān)工作狀態(tài)。這樣避免了開關(guān)管的電流電壓的交疊，降低了功率開關(guān)管的損耗，提高了LED電源的效率。根據(jù)仿真的結(jié)果，在60kHz的開關(guān)頻率下，開關(guān)功率管的損耗在軟開關(guān)時只有其硬開關(guān)時的一半左右。 采用單片機為軟開關(guān)電源的主控芯片，單片機的AD輸入口為電流電壓反饋信號的輸入口，由兩個NMOS管及開關(guān)變壓器組成半橋轉(zhuǎn)換電路。單片機輸出只有5V，并且NMOS管接高壓端需要自舉驅(qū)動。采用專用的芯片實現(xiàn)了電平轉(zhuǎn)換及自舉驅(qū)動。通過在兩個開關(guān)管并聯(lián)電容，并利用變壓器的漏感對電容的充放電，實現(xiàn)了兩個開關(guān)管均處于軟開關(guān)開關(guān)模式工作。 為了簡化計算過程，利用計算機仿真優(yōu)化電路設(shè)計。對電路的實施了多項測試工作。測試結(jié)果表明電源具有恒流特性滿足LED驅(qū)動要求，電源效率達到91%以上。
[Abstract]:Switching power supply has the advantages of light and high efficiency, and can be used in various fields. The power consumption of switching power supply is caused by switching power tube loss, switching transformer loss, Rectifier loss and other auxiliary circuit losses. Since switching power transistor losses account for the largest proportion of the total power loss, this design focuses on the use of soft switching circuit to reduce the switching loss. In order to improve the overall efficiency of the switching power supply, this soft switching technology is applied to the LED(Light Emitting Diode driver to improve the overall efficiency of the LED power supply. By using the resonant technique of capacitive inductance, the leakage inductance of transformer and the shunt capacitance of switch tube, The soft switching state is realized by providing the condition of zero voltage conduction for the on-off power switch, which avoids the overlap of the current and voltage of the switch and reduces the loss of the power switch. The efficiency of the LED power supply is improved. According to the simulation results, the loss of the switching power transistor is only about half of that of the hard switch when the switching frequency is 60 kHz. The single-chip microcomputer is used as the main control chip of the soft-switching power supply, and the AD input port of the single-chip microcomputer is the input port of the current-voltage feedback signal. The half-bridge conversion circuit is composed of two NMOS transistors and switch transformers. The output of single-chip microcomputer is only 5V, and the high voltage end of NMOS transistor needs bootstrap drive. A special chip is used to realize the level conversion and bootstrap drive. By using the leakage inductance of transformer to charge and discharge the capacitance, the two switches are in soft switching mode. In order to simplify the calculation process, the computer simulation is used to optimize the circuit design. Many tests are carried out on the circuit. The test results show that the constant current characteristic of the power supply meets the requirements of LED drive, and the efficiency of the power supply is over 91%.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN86

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