The invention discloses a control method for a power supply circuit. The power supply circuit (13) comprises a first switch (K11), three bridge arms and a motor. Each bridge arm comprises a first switch tube and a second switch tube; wherein the direct-current power supply (11) is coupled with a switching tube of each bridge arm and a power battery (12) through a first switch (K11), and the control method comprises the following steps of: controlling the first switch (K11) to be switched off under the condition that the direct-current power supply (11) is detected to stop supplying power; after the first switch (K11) is turned off, a second switch tube (Q112) in the first bridge arm, a first switch tube (Q121) of a second bridge arm in the bridge arms and a first switch tube (Q131) of a third bridge arm in the bridge arms are controlled to be turned on; the power battery (12) passes through a first switch tube (Q121) of the second bridge arm, a first switch tube (Q131) of the third bridge arm and a second switch tube (Q112) of the first bridge arm to form a first closed loop; the power battery (12) provides a first current to the motor, and the first current controls the torque of the motor. The invention further discloses a control device for the power supply circuit and an electric automobile. The control method can weaken the tooth beating sound and improve the NVH characteristic of the electric automobile.
一种用于供电电路的控制方法,该供电电路(13)包括第一开关(K11)、三个桥臂以及电机;各个桥臂均包括第一开关管和第二开关管;其中,直流电源(11)通过第一开关(K11)与各个桥臂的开关管以及动力电池(12)耦合,该控制方法为:在检测到直流电源(11)停止供电的情况下,控制第一开关(K11)关断;并在第一开关(K11)关断之后,控制第一桥臂中的第二开关管(Q112)、各个桥臂中的第二桥臂的第一开关管(Q121)以及各个桥臂中的第三桥臂的第一开关管(Q131)导通,使得动力电池(12)经过第二桥臂的第一开关管(Q121)、第三桥臂的第一开关管(Q131)以及第一桥臂的第二开关管(Q112)形成第一闭合回路;动力电池(12)向电机提供第一电流,第一电流控制电机的扭矩。还公开了一种用于供电电路的控制装置以及电动汽车。此控制方法可以减弱打齿声响,改善电动汽车的NVH特性。
Control method and device for power supply circuit and electric automobile
一种用于供电电路的控制方法、装置以及电动汽车
2024-09-06
Patent
Electronic Resource
Chinese
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