The invention relates to the technical field of aerospace thermal control, in particular to an on-orbit power supply method and device for an extremely low excitation temperature control device. Comprising the following steps: selecting an on-orbit power supply output waveform; selecting the amplitude of on-orbit power supply output; and selecting an on-orbit power supply output frequency. The step of selecting the waveform output by the on-orbit power supply comprises the substeps of obtaining a heater power supply mode of the extremely-low excitation temperature control device according to the distance and compensation power between an optical platform of the extremely-low excitation temperature control device and a vector magnetometer; the layout and the power of the compensation power are obtained through software simulation modeling; establishing a simulation model; a heating loop is obtained; the heating loops within the set threshold range of the distance vector magnetometer are powered through sine waves, and the heating loops beyond the set threshold range of the distance vector magnetometer are powered through square waves. Aiming at the problem that local excitation of the current temperature control system is too strong, the invention provides a solution for supplying power by using alternating current, and an alternating current power supply design method for the extremely low excitation temperature control device is formed.

本发明涉及航天热控技术领域，特别是涉及一种极低励磁控温装置在轨供电方法及装置。包括：选择在轨供电输出的波形；选择在轨供电输出的幅值；选择在轨供电输出的频率。选择在轨供电输出的波形包括：根据极低励磁控温装置的光学平台与矢量磁力仪之间的距离和补偿功率，得到极低励磁控温装置的加热器供电方式；通过软件仿真建模得到补偿功率的布局、功率；建立仿真模型；得到加热回路；距离矢量磁力仪设定阈值范围以内的加热回路，通过正弦波供电，距离矢量磁力仪设定阈值范围以外的加热回路，通过方波供电。本发明针对当前控温系统局部励磁过强的问题提出了使用交流电供电的解决方法，形成了针对极低励磁控温装置的交流电供电设计方法。