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The circuit topology of a Zeta converter is very complicated , which made it difficult to use the conventional modeling approaches for its common modeling. In this paper, the pulse waveform integral approach is utilized to model and analyze the Zeta converter, then the unified circuit topology can be obtained, and in accordance with this unified circuit, the small-signal dynamic mathematical model...
Currently, it's lack of systematic research on control strategy of operation and maintenance of on-load capacity regulating transformers, which causes insufficient depth of development of corresponding control devices with incomplete function and low intelligent degree, thus they are not convenient for users' electrical equipment and safety management. Under on this background, in order to make a...
Based on the safety spark test apparatus, the Short-Circuit Spark Discharge (SCSD) behavior of the simple capacitive circuit and switching converter are studied. It is pointed out that their SCSD process can be divided into four stages, i.e., dielectric-breakdown stage, spark-generated stage, spark-maintenance stage and spark-extinguish stage. For the simple capacitive circuit, its spark resistance...
For the traditional current detection method of a synchronous rectifier converter is easy to make the additional power loss and low detection accuracy such problems, it proposes a new current detection method, which detects the current using the conduction voltage drop of the synchronous rectifier, by introducing a negative feedback loop to force the voltage equal, which across the operational transconductance...
This paper studies a three-stage stackelberg game of seller and the auction house in a sealed-bid auction model with two parameters of a reserve price and a commission rate. We discuss two kinds of models. In the model one, the auction house is the leader and seller is the follower; in model two, seller is the leader and the auction house is the follower. We get the revenues of both seller and the...
Stability of the peak-current controlled mode converters (PCCMC) is analyzed, it is pointed out that the PCCMC operating in discontinuous conduction mode (DCM) are stable, while it must be added with slope compensation circuit when it operates in continuous conduction mode (CCM) and the duty cycle (d) is larger than 0.5. Based on analyzing effect of the slope compensation circuit on the oscillator,...
The energy transfer behavior of Buck-Boost converters is analyzed, according to the minimum inductor-current in the turn-off period of the power switch, the energy transfer modes of Buck-Boost converters can be classified into two types, i.e, complete inductor supply mode (CISM) and incomplete inductor supply mode (IISM). The critical condition and critical inductance of CISM and IISM are obtained...
Motivated by portable electronic equipments which demand compact, light weight, and highly efficient DC/DC converters, a step down converter with a novel on-chip current protecting technique is presented in this paper. Based on the proposed frequency-variable protection technique, the duty cycle become lower when the output current exceeds the first given value (the voltage across RS is greater than...
Ultra-precision machining is a key technology developed with the process of manufacturing. At the point of micro driving, regulating the accuracy of machine tool with smart materials that can generate micro movement to an extent of nanometer level is often introduced to satisfy the required precision. Aiming at reducing the positioning error of a precision working table driven by an AC servo motor,...
To obtain the optimization design method of the inductance of Boost converters, the Output Voltage Ripples (OVR) in each operating mode are analyzed, respectively. The maximum ORV (MOVR) is deduced. It is concluded that the converter in CISM has the smallest output voltage ripple independent of the inductance, while that the minimal inductance to guarantee the MOVR to be the lowest is the critical...
The operating region of the converter is divided into four parts on the input-voltage versus load plane according to the inductance. The Maximum Output Voltage Ripple (MOVR) in each operating region is analyzed, respectively. It is pointed out that the minimum inductance to guarantee the lowest Output Voltage Ripple (OVR) is the critical inductance of CCM and DCM under the highest input voltage and...
Inductor-disconnected-discharge (IDD) behavior of the boost converter is analyzed, an equivalent-resistance-analysis method (ERAM) is proposed, which can convert the IDD behavior of the boost converter into that of an equivalent simple-inductive-circuit (SIC). According to the energy equivalence, the equivalent inductor-current of the equivalent SIC is obtained. It is indicated that the equivalent...
This paper presents an improved EMD algorithm for the fault diagnosis of reciprocating pump valves with spring failure. The vibration signal of reciprocating pumps is of typical nonstationarity. Although the EMD algorithm adopting the cubic spline interpolation is an effective tool processing non-stationary signal, it couldnpsilat accurately extract fault characteristics from the highly nonstationary...
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