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The detection system for harmonic is designed in this paper. The adopted microchip is LPC1114 with the built-in A/D device. The high precision signals of current and voltage are sampled by using the A/D device. The sampling data is analyzed by the windowed interpolation FFT algorithm. And the frequency and amplitude of fundamental and harmonic wave for the current and voltage is got. The test results...
This paper describes a novel topology of soft starter for induction motors. Unlike the thyristerized soft starter, the proposed circuit configuration utilizes the self-commutated device to replace the thyristor as the switch on the supply line. The operating principle of the control system is analyzed. The transient process during starting has been studied using a presented mathematical model which...
The novel three-phase single-stage topology for chargers is proposed in this paper. This topology is based on the three-phase half-bridge rectifier, combining with the features of boost circuit. It makes the circuit is simple, and the power electronic devices is less that the rectifier diode works as freewheel diode in the PFC (Power Factor Correction) circuit. And low power bi-directional rectifier...
A fast algorithm of the virtual value for a three-phase system is presented in this paper. The virtual value of a three-phase system is simply calculated according to the instantaneous value of three-phase components. Compared with the conventional calculating method using lots of sampling data in one or several cycles, the proposed method not only simplifies the operating process but also shorten...
The principle and design procedures of single stage PFC LED driver based on L6562 are discussed in this paper. Then the design of transformer and feedback loop are described in detail. The specification and experimental results are proposed at last.
A three-stage constant power Metal Halide Lamps ballast controlled by NXP LPC1114 is presented in the paper. The topology is analyzed in detail, and the improved low-bridge buck circuit is adopted which solves the MOSFET drive difficulty of high-bridge buck circuit. The Metal Halide Lamps constant power control is realized by controlling the buck input power precisely, which is easy-controlling and...
The novel single-phase single stage topology for charger is proposed in this paper. This topology, where the freewheeling inductance is placed at the AC side, uses a single switching device to control the output voltage and current. The main principle of the novel topology is described, and the operating performance is analyzed by simulation. The control strategy of the novel charger is discussed...
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