Abb Schweiz Ag

Abb E-mobility B.v.

Kai Tian

Tinho Li

Kuenfaat Yuen

Mei Liang

Guoxing Fan

Sheng Zong

Chengjing Li

Tian Tan

Ke Dai

Derong Lin

An objective of the disclosure is to provide a power supply cell of a power supply system and a power supply system using the same. The power supply cell includes a first power conversion circuit operative to output a first DC voltage across its first positive terminal and first negative terminal, a second power conversion circuit operative to output a second DC voltage across its second positive terminal and second negative terminal, a first controllable unidirectional semiconductor switch operative to generate a first conduction path from the first positive terminal of the first power conversion circuit to the second negative terminal of the second power conversion circuit, a first unidirectional semiconductor switch operative to generate a second conduction path from the first positive terminal of the first power conversion circuit to the second positive terminal of the second power conversion circuit, a second unidirectional semiconductor switch operative to generate a third conduction path from the first negative terminal of the first power conversion circuit to the second negative terminal of the second power conversion circuit, a first low-pass filter, a second low-pass filter, a third low-pass filter and a controlling unit. The controlling unit is operative to: issue turn-on signal to the first controllable unidirectional semiconductor switch so that the first power conversion circuit and the second power conversion circuit supply current to the first low-pass filter via the first conduction path, the second low-pass filter and the third low-pass filter; or issue turn-off signal to the first controllable unidirectional semiconductor switch so that the first power conversion circuit and the second power conversion circuit supply currents to the first low-pass filter in parallel via the second conduction path and the second low-pass filter together with the third conduction path and the third low-pass filter. The first low-pass filter can help smooth an output voltage and current in order to achieve a relatively wide linearly constant output power range.

Power supply cell and power supply system using the same

A power supply cell of a power supply system including a first power conversion circuit to output a first DC voltage, a second power conversion circuit to output a second DC voltage, a first controllable unidirectional semiconductor switch to generate a first conduction path from the first power conversion circuit to the second power conversion circuit, a first unidirectional semiconductor switch to generate a second conduction path from the first power conversion circuit to the second power conversion circuit, a second unidirectional semiconductor switch to generate a third conduction path from the first power conversion circuit to the second power conversion circuit, a first low-pass filter, and a controlling unit operative to issue turn-on signal or turn-off signal to the first controllable unidirectional semiconductor switch to supply current to the low-pass filter via the first conduction path or both of the second conduction path and the third conduction path.

Voltage converter circuits including a first and second branch. The first branch is coupled between a first DC terminal and a second DC terminal and includes a first and second winding around a magnetic core. The first and second winding are coupled to an AC terminal via a common node. The second branch is coupled in parallel to the first branch between the first and second DC terminals and includes a third winding around the magnetic core. The third winding is coupled to the AC terminal such that the first and second branches convert a first voltage into a second voltage. The first, second and third windings are configured to cause magnetic flux generated by a differential mode (DM) component of a first current in the first branch and magnetic flux generated by the DM component of a second current in the second branch to enhance with each other.

Interleaved converter

A system and a method for power conversion. The system includes a rectifier; an inverter; a DC-link capacitor coupled between the rectifier and the inverter; and a controller. The controller is configured to obtain a current value at an output of the inverter and a voltage value across the DC-link capacitor, determine an average component and a fluctuating component of an output voltage of the inverter based on the obtained current value and the voltage value, and determine a current reference for controlling the rectifier based on the average component and the fluctuating component of the output voltage.

System and method for power conversion

An apparatus for conversion between AC power and DC power. The apparatus includes: a first power conversion circuit having a first AC side and a DC side, at least one second power conversion circuit each having a second AC side and sharing the DC side with the first power conversion circuit, and at least one choke having a first terminal, a second terminal and at least one third terminal, wherein: the first terminal is arranged to be electrically coupled to a phase of the AC power, and the second terminal and the at least one third terminal are electrically coupled to respective same phases of the first AC side of the first power conversion circuit and the second AC side of the at least one second power conversion circuit. Moreover, the choke includes: a first common-mode choke and a first differential-mode choke, wherein: the first common-mode choke and the first differential-mode choke are electrically coupled in series via a first group of coil ends of the first common-mode choke and a first group of coil ends of the first differential-mode choke, and a second group of coil ends of one of the first common-mode choke and the first differential-mode choke are electrically coupled to the first terminal of the choke, and a second group of coil ends of the other are respectively electrically coupled to the second terminal and the at least one third terminal of the choke. The first common-mode choke can help provide high inductance to the high-frequency components of the common-mode current, which flows from the AC power source, since the impedance of the common-mode choke and the differential-mode choke depends on frequency on the same scale as inductance. The advantages of using the common-mode choke is that it provides twice the inductance of separate inductor design due to the coupling effect. Therefore it filters the common-mode current more effectively on the inductance size can be reduced for a given current ripple requirement.

Apparatus for conversion between AC power and DC power

An objective of the present application is to provide an apparatus for conversion between AC power and DC power. The apparatus includes a first power conversion circuit having a first AC side and a first DC side, at least one second power conversion circuit each having a second AC side and a second DC side; and at least one choke having a first terminal, a second terminal and at least one third terminal, wherein the first terminal is arranged to be electrically coupled to a phase of the AC power, and the second terminal and the at least one third terminal are electrically coupled to respective same phases of the first AC side of the first power conversion circuit and the second AC side of the at least one second power conversion circuit. Moreover, the choke includes a first common-mode choke and a first differential-mode choke, wherein: the first common-mode choke and the first differential-mode choke are electrically coupled in series via a first group of coil ends of the first common-mode choke and a first group of coil ends of the first differential-mode choke, and a second group of coil ends of one of the first common-mode choke and the first differential-mode choke are electrically coupled to the first terminal of the choke, and a second group of coil ends of the other are respectively electrically coupled to the second terminal and the at least one third terminal of the choke. The first common-mode choke can help provide high inductance to the high-frequency components of the common-mode current, which flows from the AC power source, since the impedance of the common-mode choke and the differential-mode choke depends on frequency on the same scale as inductance. The advantages of using the common-mode choke is that it provides twice the inductance of separate inductor design due to the coupling effect. Therefore it filters the common-mode current more effectively or the inductance size can be reduced for a given current ripple requirement.

A power converter includes a full-bridge conversion circuit. The full-bridge conversion circuit includes a first leg and a second leg. The first leg includes at least two switches coupled to each other at a first node, and the second leg includes at least two switches coupled to each other at a second node. The power converter further includes an AC filter. The AC filter includes a first inductor, a second inductor and a capacitor. The first inductor includes a first end coupled to the first node and a second end could be couple to a grid. The second inductor includes a first end coupled to the second node and a second end could be couple to the grid. The capacitor includes a first end coupled to the second end of the first inductor and a second end coupled to the second leg. The first end of the capacitor is electrically coupled to the second end of the first inductor during a cycle of an AC voltage of the grid.

Growing community of inventors

Hebei, China

Kai Tian