Abstract: A power converter includes an output inductor, an output capacitor, a first current sampling circuit, a first-phase bridge arm, a second-phase bridge arm, a third-phase bridge arm, and a controller. A midpoint of the first-phase bridge arm is coupled to a first input end of the power converter. A midpoint of the second-phase bridge arm is coupled to a first end of the output capacitor and a second input end of the power converter. A midpoint of the third-phase bridge arm is coupled to a second end of the output capacitor through the output inductor. The first end is coupled to a second output end of the power converter. The second end is coupled to a first output end of the power converter.

Abstract: A power converter includes an output inductor, an output capacitor, a first current sampling circuit, a first-phase bridge arm, a second-phase bridge arm, a third-phase bridge arm, and a controller. A midpoint of the first-phase bridge arm is coupled to a first input end of the power converter. A midpoint of the second-phase bridge arm is coupled to a first end of the output capacitor and a second input end of the power converter. A midpoint of the third-phase bridge arm is coupled to a second end of the output capacitor through the output inductor. The first end is coupled to a second output end of the power converter. The second end is coupled to a first output end of the power converter.

Abstract: A power distribution circuit of an uninterruptible power supply is provided, where a first port of the power distribution circuit of the uninterruptible power supply is electrically connected to a second port. A third port is electrically connected to the second port by using a compensation circuit. When an input voltage of the first port is less than a rated voltage of a load of the second port, an input voltage of the third port is input to the compensation circuit. The compensation circuit converts a direct current into an alternating current, so that the alternating current output by the compensation circuit and the input voltage of the first port jointly supply power to the load of the second port.

Abstract: Some embodiments of the disclosure provide a method for measuring orthogonality of an orthogonal axis system, In some examples, the method includes following steps: placing an instrument on a bearing surface, intercepting a second rotary axis along an interception plane to obtain a first virtual cross section of the second rotary axis, and measuring the first virtual cross section to obtain a geometric center of the first virtual cross section as a first position; rotating a first rotary device to enable the second rotary axis to rotate with a preset angular degree, and measuring the second virtual cross section to obtain a geometric center of the second virtual cross section as a second position; and determining whether the orthogonality between the first rotary axis and the second rotary axis meets requirements or not on the basis of the first position and the second position.

Abstract: A power distribution circuit of an uninterruptible power supply is provided, where a first port of the power distribution circuit of the uninterruptible power supply is electrically connected to a second port. A third port is electrically connected to the second port by using a compensation circuit. When an input voltage of the first port is less than a rated voltage of a load of the second port, an input voltage of the third port is input to the compensation circuit. The compensation circuit converts a direct current into an alternating current, so that the alternating current output by the compensation circuit and the input voltage of the first port jointly supply power to the load of the second port.