This paper presents a novel direct parallel power control scheme with independent current paths for the proposed hybrid energy-harvesting system that consists of a low-power photovoltaic panel, a piezoelectric harvesting module, and an energy storage system. A battery is connected to store the generated power from the two renewable power sources to provide a continuous power supply for the users. The designed power converter controls both battery state and power supply without any power conditioning system. To achieve this, a low-power DC–DC converter with battery charging function and control algorithm is designed for the hybrid power source. Therefore, in the proposed system, no additional battery charge controller is required. To control the battery, however, an additional current sensor to detect the battery power is simply added to each DC–DC converter. In the proposed power control scheme and controller, each power input, output, and the combined power flow are connected with neither communication protocols nor additional controller. Moreover, the converters can adjust the supplied power for parallel power-sharing. For maximum output current protection in each converter and constant current control for the battery, a hybrid power connection and its related current path are also proposed in this paper. The effectiveness of the proposed hybrid power system and the direct parallel power control scheme was verified through experiments.

本文提出了一种新颖的具有独立电流路径的直接并联功率控制方案，用于拟议的混合能量收集系统，该系统由低功率光伏面板，压电收集模块和能量存储系统组成。连接电池以存储来自两个可再生电源的发电量，以为用户提供连续的电源。设计的电源转换器无需任何电源调节系统即可控制电池状态和电源。为此，针对混合电源设计了具有电池充电功能和控制算法的低功率DC-DC转换器。因此，在提出的系统中，不需要额外的电池充电控制器。但是，要控制电池，只需在每个DC-DC转换器上添加一个额外的电流传感器即可检测电池电量。在提出的功率控制方案和控制器中，每个功率输入，输出和组合功率流均未与通信协议或附加控制器连接。此外，转换器可以调节所提供的功率以进行并联功率共享。为了在每个转换器中提供最大的输出电流保护并为电池提供恒定电流控制，本文还提出了一种混合电源连接及其相关的电流路径。通过实验验证了所提出的混合动力系统和直接并联功率控制方案的有效性。并且组合的功率流既未与通信协议相连，也未与附加控制器相连。此外，转换器可以调节所提供的功率以进行并联功率共享。为了在每个转换器中提供最大的输出电流保护并为电池提供恒定电流控制，本文还提出了一种混合电源连接及其相关的电流路径。通过实验验证了所提出的混合动力系统和直接并联功率控制方案的有效性。并且组合的功率流既未与通信协议相连，也未与附加控制器相连。此外，转换器可以调节所提供的功率以进行并联功率共享。为了在每个转换器中提供最大的输出电流保护并为电池提供恒定电流控制，本文还提出了一种混合电源连接及其相关的电流路径。通过实验验证了所提出的混合动力系统和直接并联功率控制方案的有效性。