Abstract:
A permanent magnet motor is provided. The permanent magnet motor includes a stator having a stator shaft having an outer surface, K salient teeth formed upon the outer surface, and K winding slots formed among the K salient teeth, and a rotor having a first inner surface facing the outer surface, and P pairs of permanent magnets formed on the first inner surface, each of which has a second inner surface facing the outer surface and at least a groove formed on the second inner surface to reduce a cogging torque.
Abstract:
The present invention discloses a switching power converter with low common mode noise. The switching power converter comprises at least a switch with at least a terminal wherein said switch turning on and off alternatively which generates a plurality of noise voltages, and the noise voltage having a jump point and a static point wherein the jump point is one of said inductive component terminals, the capacitive component terminals and the second and third terminal of the switch; and an additional impedance connected between the static point and the jump point of different noise voltage to neutralize common noise current. In addition, another switching power converter having primary side and secondary side can be used to reduce the common mode noise by adding some additional impedance between the static points and jump points of the primary side and secondary side.
Abstract:
The configurations of an inverter circuit are provided in the present invention. The proposed circuit includes a first bridge arm having a first sub-bridge arm with a first switch and a first middle point coupled to the first switch, and a second sub-bridge arm with a second switch and a second middle point coupled to the second switch, a first inductor having a first terminal coupled to the first middle point and a second terminal, and a second inductor having a first terminal coupled to the second middle point, and a second terminal coupled to the second terminal of the first inductor and outputting an AC voltage.
Abstract:
The configurations of an H-bridge circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes an H-bridge having a first and a second bridge arms, each of which has a middle point, and a bidirectional switch connected to the two middle points, a bootstrap circuit providing a bootstrap voltage, a driving circuit receiving the bootstrap voltage and driving the bidirectional switch, and an energy compensation circuit coupled to the H-bridge, the bootstrap circuit and the driving circuit, and providing a compensation energy to the bootstrap circuit.
Abstract:
The configurations of a parallel-connected resonant converter circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a plurality of resonant converters, each of which has two input terminals and two output terminals, wherein all the two input terminals of the plurality of resonant converters are electrically series-connected, and all the two output terminals of the plurality of resonant converters are electrically parallel-connected.
Abstract:
The configurations of a discharge lamp system and a controlling method thereof are provided in the present invention. The proposed discharge lamp system includes a discharge lamp, a converter circuit coupled to the discharge lamp and having a switching switch, a ballast controller generating a first driving signal and controlling the switching switch accordingly, and a voltage sensing apparatus receiving the first driving signal and generating a sensed voltage accordingly, wherein the discharge lamp is switched among a plurality of operating modes according to the sensed voltage.
Abstract:
A connector and a power transformer structure comprising the same are provided. The power transformer structure comprises a connector and an integrated transformer. The connector comprises a plurality of connection units, and the integrated transformer comprises a plurality of transformation units. The transformation units are sequentially stacked and electronically connected to the corresponding connection units in contact connection to reduce the current conduction consumption and contact resistance.
Abstract:
A permanent magnet motor is provided. The permanent magnet motor includes a stator having a stator shaft having an outer surface, K salient teeth formed upon the outer surface, and K winding slots formed among the K salient teeth, and a rotor having a first inner surface facing the outer surface, and P pairs of permanent magnets formed on the first inner surface, each of which has a second inner surface facing the outer surface and at least a groove formed on the second inner surface to reduce a cogging torque.
Abstract:
A method for starting a motor having a stator, a rotor, a winding and an asymmetrical air gap is accomplished using several steps. The steps include: (a) providing the motor at standstill; (b) exciting the winding for a specific time period with a current impulse having a first amplitude to obtain a first specific position of the rotor with respect to the stator; (c) decreasing the first amplitude down to a second amplitude gradually by a controller to make the rotor to be positioned at a second specific position with respect to the stator after the specific time period, wherein the second amplitude is one of zero ampere and a specific value close to zero ampere, and the rotor is rotating close to the second specific position with an almost zero rotating speed when the second amplitude is reached.
Abstract:
A bridgeless power factor correction converter that can reduce common-mode noise and enhance power density is made up of a boost inductor coupled to an input end, a bidirectional switch connected in series with the boost inductor, a first series rectifying circuit having a junction node connected between the boost inductor and the bi-directional switch, a second series rectifying circuit connected in parallel with the first series rectifying circuit and having a junction node coupled to the bi-directional switch, and an output capacitor connected in parallel with the second series rectifying circuit, in which the second series rectifying circuit is made up of slow-recovery diodes and the first series rectifying circuit is made up of fast-recovery diodes.