采用负载瞬态检测的DC-DC转换器单粒子加固设计方法

Method of single event effects radiation hardened for DC-DC converter using load transient detection

摘要:

为提高电源管理芯片中DC-DC转换器的抗单粒子瞬态(single event transient,SET)效应能力,深入研究了DC-DC转换器中SET与负载瞬态的区别,并提出一种基于负载瞬态检测的辐射加固设计(radiation hardened by design,RHBD)电路。该设计通过区分SET与负载瞬态来输出控制信号控制RHBD电路,从而实现动态条件下系统瞬态特性的改善。基于180 nm的BCD工艺,完成Boost型转换器的设计与验证。实验结果表明:输入电压为2.9~4.5 V,输出电压为5.8~7.9 V,负载电流为0~55 mA时,负载瞬态过程中,检测电路能及时关闭加固电路,避免系统振荡；SET作用下,系统输出电压波动不超过最大电压纹波,SET抑制能力达到86%以上,系统可在线性能量传递值（linear energy transfer,LET）为100 MeV·cm²/mg的辐射条件下正常工作。本文提出的加固电路,在负载变化下能够不影响系统正常工作,且可以抑制SET的影响。

Abstract:

To enhance the capability of DC-DC converter in power management integrated circuit to withstand single event transient (SET), this study thoroughly investigates the characteristics between SET and load transient in DC-DC converter. Based on this analysis, a radiation hardened by design (RHBD) circuit is proposed. This design outputs control signals to manage the RHBD circuit, by distinguishing SET from load transients, thereby enhancing transient response under dynamic conditions. thereby enhancing transient response under dynamic conditions. The design and validation of a Boost converter are completed based on a 180 nm BCD process. Experimental results demonstrate that with an input voltage range of 2.9 to 4.5 V, an output voltage range of 5.8 to 7.9 V, and a load current ranging from 0 to 55 mA, the detection circuit swiftly disables the hardening module during load transient events. This effectively prevents oscillations. Under the influence of SET, output fluctuations remain within maximum allowable ripple, achieving a SET suppression capability of over 86%. The system operates normally under ionizing radiation with linear energy transfer (LET) up to 100 MeV·cm²/mg. The hardened circuit proposed in this paper can maintain normal operation under varying load conditions while also mitigating SET.