DC-DC转换器的 SET分析及自动保持加固方法研究

Research on SET analysis and automatic hold hardening method of DC-DC converters

摘要

通过高能粒子入射的电路级模拟，研究了Boost型DC-DC转换器敏感元件PWM控制器中误差放大器（EA）的单粒子瞬态效应（SET），对SET在环路中的传递进行了分析和仿真验证，得出了SET对DC-DC输出电压的影响与负载大小的关系。针对DC-DC转换器PWM控制单元中的误差放大器输出端所发生的SET，提出了一种电压自动保持的辐射加固方法。通过对EA输出电压的采样和比较，实现了对SET的检测，以及通过自动保持电路对EA输出电压进行保持，隔绝了SET在环路中的传递，确保了DC-DC输出电压的稳定。基于180 nm商用BCD工艺对该方法进行验证，结果表明，在高能粒子的线性能量传递值LET=100 MeV·cm ²/mg的条件下，EA输出端产生的负SET和正SET所造成的DC-DC输出电压跃变现象均得到了有效缓解，缓解能力分别达到96.1%和87.1%。此外，针对加固后的EA，其输出节点发生的SET有95.5%的概率对DC-DC转换器的输出电压不造成影响。

Abstract

The single event transient (SET) effects of the error amplifier (EA) in the pulse-width modulation (PWM) controller of a Boost DC-DC converter sensitive component was investigated through circuit-level simulations with high-energy particle incidence. The transmission of SET in the loop was analyzed and verified through simulation, and the relationship between the impact of SET on the DC-DC output voltage and the load size was obtained. A radiation hardening method based on automatic voltage hold was proposed to address the occurrence of SET at the output terminal of the EA in the PWM control unit of the DC-DC converter. Detection of SET was achieved through sampling and comparing the EA output voltage, followed by maintaining the EA output voltage using the automatic hold circuit to isolate the propagation of SET in the loop, ensuring the stability of the DC-DC output voltage. The proposed method was validated based on a 180nm commercial BCD process. Experimental results show that under the condition of linear energy transfer (LET) value of 100 MeV·cm²/mg for high-energy particles, the DC-DC output voltage jump phenomena caused by negative SET and positive SET generated at the EA output have been effectively mitigated, achieving mitigation capabilities of 96.1% and 87.1%, respectively. In addition, for the hardened EA, there is a 95.5% probability that SET occurring at the output node will not affect the output voltage of the DC-DC converter.

关键词

DC-DC转换器 / 单粒子瞬态效应 / 辐射加固设计 / 自动保持

Key words

DC-DC converter / single event transient effect / radiation hardened by design / automatic hold

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基金资助

国家自然科学基金面上项目(62171367)

陕西省重点研发计划(2021GY-060)

陕西省创新能力支撑计划(2022TD-39)

西安理工大学校企协同基金(252062213)