(EN)
A power supply (40) has a power supply circuit constituted of a main power supply circuit (50) having a high voltage battery (51) and a step-down circuit (55) for lowering the voltage of the high voltage battery (51), and a sub-power supply circuit (60) having a low voltage battery (61) and a step-up circuit (70) for raising the voltage of the low voltage battery (61). The main power supply circuit (50) and the sub-power supply circuit (60) are connected in parallel, and the output voltage of the sub-power supply circuit (60) is set lower than the output voltage of the main power supply circuit (50). When the output voltage of the main power supply circuit (50) drops below target voltage of the sub-power supply circuit (60), the voltage is raised by the step-up circuit (70) before being supplied to a motor drive circuit (32). Power supply to an electric power steering system can be backed up at low cost.
(ZH) 供电设备(40)具有供电电路，供电电路由包括高压电池(51)和用于使高压电池(51)的电压下降的降压电路(55)的主供电电路(50)以及包括低压电池(61)和用于使低压电池(61)的电压升高的升压电路(70)的副供电电路(60)形成。主供电电路(50)与副供电电路(60)并联连接。将副供电电路(60)的输出电压设定为低于主供电电路(50)的输出电压。当主供电电路(50)的输出电压变为低于副供电电路(60)的目标电压时，由升压电路(70)升压的电压被供应至电动机驱动电路(32)。因此，可以低成本实现对电动转向设备的供电后备。
