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A novel and simple structure for improving CMRR is introduced. This structure can be added to the circuits like folded cascode amplifier, telescopic amplifier, current buffers, .etc to improve the CMRR of these circuits. This simple and effective circuit uses common mode deviating technique to improve CMRR at least 12dB while preserves CMRR bandwidth which is a novel technique in order to improve...
The main purpose of this paper is to design a pulse-width-modulated (PWM) pulse power supply to test the performance of the solenoid valve. In order to achieve this purpose, from hardwave stage, one of the main part of designing is to use a microcontroller unit (MCU) as the core in the control system cooperating with the functional generator chip MAX038 and SG3525 to output the desired PWM waveform...
Economical and ecological motives are pushing shoreside power supply by power electronics systems for merchant ships as well as for cruise ships. Also, final tests of on-ship power systems and generation are simplified considerably. Fault scenarios on-ship and within the harbour grid and the variability of the parameters of on-ship distribution - each ship is special, and large consumers or generators...
Lightweight power supply systems using soft-switched high frequency dc-dc converter for rolling stock is proposed in this paper. The system consists of hard switched boost chopper, soft switched high frequency inverter, high frequency transformer and rectifier. This system features a boost chopper to control the input current and to set up a controlled DC link. And A soft switched full bridge inverter...
Design an electrical locomotive 110 V D.C. source with PFC based on the structure of two-stage switching converter. Discuss the design scheme of main circuit and control circuit. Expound the calculation method of the key parameters. The experiments indicate that the device gets good performance on output and reliability. The electric source is appropriate for electrical locomotive and the other similar...
In this paper, the different influences of three-limb and multi-limb transformer with Star-Star or Delta-Star connection, three-limb filter inductor, multi-limb filter inductor and position of the LC filter in a three-phase PWM inverter have been analyzed in detail in stationary dq0 frame. The analysis show that three-phase transformer with different limb numbers and connection types have different...
Based on the working conditions and development trend of operating mechanism of high-voltage circuit breaker, this paper presented a high-load adjustment rate of portable high-frequency switching power supply designed for high-voltage circuit breakers test. The main circuit topological structure is analysed in detail, which uses the fullbridge circuit and IGBTs (insulated gate bipolar transistor)...
High Voltage Power Supply (HVPS) of Diagnostic Neutral Beam (DNB) for HT-7 is presently operating. The high voltage pulse capacitor banks provide the primary voltage source for tetrode which is the system regulator by controlling the tetrodepsilas voltage drop between cathode and anode to get steady output voltage in DNB load. It will be introduced that a new capacitor banks charging system uses 3-phase...
In this paper, a new type of doubly-fed variable-speed salient-pole synchronous machine(DVSSM) is presented. The structure of the stator of this generator is identical with that of the conventional AC motor, which employs the fundamental frequency power supply. The structure of the rotor is splitting salient -pole, in which the excitation winding of the magnetic pole is supplied by the low frequency...
In synchronous rotating frame (SRF), the mathematical mode of a three-phase PWM VSI with LC filter is complex, and the dq components have cross coupling terms. In order to obtain good dynamic and static performance, the controller structure should be inherently based on the systempsilas mathematical model, which means that the decoupling control strategy with feed-forward should be adopted. But this...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
It is necessary to do burn-in test for many power electric products. Compared to conventional resistor method whose consumption is generally huge, equipments with power recycling function in burn-in test are recognized as more thrifty-not only reduce energy loss but also save manufacturing cost. This paper presents a digital controlled converter for AC power electronics burn-in test with energy feedback,...
The control issue of multiple inverter module operation (MIMO) is investigated for high frequency AC power distribution architecture, where multiple high frequency resonant inverters are connected in parallel to the high frequency, high voltage low current (HVLC) AC bus, to feed a number of point-of-use-power-supplies. The circulating current in MIMO is analyzed first. A novel control scheme is proposed...
This paper describes the development of the IAB-60/60 storage battery simulator especially designed for testing the power supply systems of different types of spacecrafts. The simulator features an embedded microprocessor control system consisting of a central processor and a voltage and current control device. The microprocessor control system provides the required output characteristics and control...
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