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Power factor correction (PFC) converters possess high complexities due to the introduction of the series connections among power converters, which adversely affects the stability of the PFC system. On the assumption that the input voltage can be replaced by its RMS value, and the frequencies of the inductor current and the output voltage of PFC primary converter are much lower than the switching frequency...
In the reality, people use linguistic term rather than numerical information to express their evaluations or preferences in decision making problems. To deal with the qualitative information, we propose a linguistic decision making approach based on the ten-element linguistic-valued lattice implication algebra. In this paper, we discuss the properties of two important operations, i.e. ⊗ and ⊕, in...
Monolayer graphene was fabricated using thermal chemical vapor deposition (TCVD) as heat spreaders in electronic packaging. Platinum (Pt) thermal evaluation chips were utilized to evaluate the thermal performance of the graphene heat spreaders. Temperature of hot spot driven at a heat flux of up to 430W·cm−2 was decreased by about 13 °C with the attaching of the graphene heat spreader. We demonstrate...
Gain equalizer is often used to adjust the output gain of traveling wave tubes(TWT) or high power solid state amplifiers. Traditionally, millimeter wave gain equalizer is composd of waveguide with electromagnetic wave absorber in resonance circuit. However, this structure is large, heavy, complex, not convenient to integrate. In this paper, a millimeter wave gain equalizer is fuifilled by microstrip...
In this paper, a microstrip power equalizer based on branch resonator loaded resistor is presented. According to the curved shape's similarity between equalizers and resonators, this paper prove the valid to use multi-resonators. On the basis of this, it introduces a feasible method of broad-band equalizer. It's adopted several branch resonators loaded resistor. The proposed equalizer operated from...
Catalytic combustion gas sensor is influenced by many factors, this paper analyzes theoretically output characteristics, which is helpful for designing and performance evaluation of gas sensor. It bases on sensitivity principles of catalytic combustion gas sensor, deduces the quantitative relation between output and temperature change of sensitive element, and discusses behavioral characteristics...
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