在电动汽车车载充电机系统中,前级PFC AC/DC变换器多使用电解电容作为输出电容,但电解电容的故障率高且寿命低,直接影响车载充电机的安全可靠运行。采用增大输出电容电压纹波的方法减小电容容量,以便于使用薄膜电容取代电解电容;同时为...在电动汽车车载充电机系统中,前级PFC AC/DC变换器多使用电解电容作为输出电容,但电解电容的故障率高且寿命低,直接影响车载充电机的安全可靠运行。采用增大输出电容电压纹波的方法减小电容容量,以便于使用薄膜电容取代电解电容;同时为了降低低频电压纹波对PFC AC/DC变换器动静态性能的影响,提出基于微分平坦理论的非线性功率控制方案,并针对2 k W PFC AC/DC变换器完成系统建模与仿真,通过与传统设计方案的对比证明新型非线性功率控制方案的技术优势。展开更多
针对水下远距离高压直流电能传输的海底观测网络,设计了一套装备在观测网节点上的2 000 V DC/400 V DC@2 kW的高低压直流电能变换器。基于海底应用的特殊场合,提出了具有高可靠性和高冗余度的多模块堆叠构建方式。根据电源变换理论,分...针对水下远距离高压直流电能传输的海底观测网络,设计了一套装备在观测网节点上的2 000 V DC/400 V DC@2 kW的高低压直流电能变换器。基于海底应用的特殊场合,提出了具有高可靠性和高冗余度的多模块堆叠构建方式。根据电源变换理论,分析了单个基于PWM控制的功率模块的输入/输出动态特性,以及5个模块通过输入级串联输出级并联堆叠组合后产生的不稳定问题,并针对该问题采用了基于峰值电流控制策略的单一控制器来提供同步PWM信号,所有模块基于同步信号驱动整流,实现自然均压、均流和冗余。进行了样机的半载启动和稳态运行测试、冗余特性测试和水池观测系统应用测试等试验,试验结果表明基于模块堆叠和单一控制器同步整流的方法构建的高压直流变换器能够应用于水下观测系统。展开更多
为拓宽电压输出范围,并保持零电压开关ZVS(zero voltage switching)和零电流开关ZCS(zero current switching)的特征,提出了一种新型DHC-LT双向谐振型DC-DC变换器。首先,讨论了变换器在降压和升压工作时的工作模态和特性,利用辅助变压...为拓宽电压输出范围,并保持零电压开关ZVS(zero voltage switching)和零电流开关ZCS(zero current switching)的特征,提出了一种新型DHC-LT双向谐振型DC-DC变换器。首先,讨论了变换器在降压和升压工作时的工作模态和特性,利用辅助变压器提升电压增益,采用移相控制的方式降低变换器的输出电压。随后,在变压器上增加拾取绕组,并基于此提出一种新型的磁偏检测电路和数字调节方式。最终,搭建了一台2.5 kW样机,验证了以上理论分析,且最高效率可达97.4%。展开更多
This paper presents a new strategy of embedded energy management between battery and supercapacitors (SC) for hybrid electric vehicles (HEV) applications. This proposal is due to the present trend in the field, kn...This paper presents a new strategy of embedded energy management between battery and supercapacitors (SC) for hybrid electric vehicles (HEV) applications. This proposal is due to the present trend in the field, knowing that the major drawback of the HEV is the autonomy problem. Thus, using supercapacitors and battery with a good energy management improves the HEV performances. The main contribution of this paper is focused on DC-bus voltage and currents control strategies based on polynomial controller. These strategies are implemented in PICI8F4431 microcontroller for DC/DC converters control. Due to reasons of cost and available components (no optimized), such as the battery and power semiconductors (IGBT), the experimental tests are carried out in reduced scale (2.7 kW). Through some simulations and experimental results obtained in reduced scale, the authors present an improved energy management strategy for HEV.展开更多
文摘在电动汽车车载充电机系统中,前级PFC AC/DC变换器多使用电解电容作为输出电容,但电解电容的故障率高且寿命低,直接影响车载充电机的安全可靠运行。采用增大输出电容电压纹波的方法减小电容容量,以便于使用薄膜电容取代电解电容;同时为了降低低频电压纹波对PFC AC/DC变换器动静态性能的影响,提出基于微分平坦理论的非线性功率控制方案,并针对2 k W PFC AC/DC变换器完成系统建模与仿真,通过与传统设计方案的对比证明新型非线性功率控制方案的技术优势。
文摘针对水下远距离高压直流电能传输的海底观测网络,设计了一套装备在观测网节点上的2 000 V DC/400 V DC@2 kW的高低压直流电能变换器。基于海底应用的特殊场合,提出了具有高可靠性和高冗余度的多模块堆叠构建方式。根据电源变换理论,分析了单个基于PWM控制的功率模块的输入/输出动态特性,以及5个模块通过输入级串联输出级并联堆叠组合后产生的不稳定问题,并针对该问题采用了基于峰值电流控制策略的单一控制器来提供同步PWM信号,所有模块基于同步信号驱动整流,实现自然均压、均流和冗余。进行了样机的半载启动和稳态运行测试、冗余特性测试和水池观测系统应用测试等试验,试验结果表明基于模块堆叠和单一控制器同步整流的方法构建的高压直流变换器能够应用于水下观测系统。
文摘为拓宽电压输出范围,并保持零电压开关ZVS(zero voltage switching)和零电流开关ZCS(zero current switching)的特征,提出了一种新型DHC-LT双向谐振型DC-DC变换器。首先,讨论了变换器在降压和升压工作时的工作模态和特性,利用辅助变压器提升电压增益,采用移相控制的方式降低变换器的输出电压。随后,在变压器上增加拾取绕组,并基于此提出一种新型的磁偏检测电路和数字调节方式。最终,搭建了一台2.5 kW样机,验证了以上理论分析,且最高效率可达97.4%。
文摘This paper presents a new strategy of embedded energy management between battery and supercapacitors (SC) for hybrid electric vehicles (HEV) applications. This proposal is due to the present trend in the field, knowing that the major drawback of the HEV is the autonomy problem. Thus, using supercapacitors and battery with a good energy management improves the HEV performances. The main contribution of this paper is focused on DC-bus voltage and currents control strategies based on polynomial controller. These strategies are implemented in PICI8F4431 microcontroller for DC/DC converters control. Due to reasons of cost and available components (no optimized), such as the battery and power semiconductors (IGBT), the experimental tests are carried out in reduced scale (2.7 kW). Through some simulations and experimental results obtained in reduced scale, the authors present an improved energy management strategy for HEV.