Driving power metal-oxide semiconductor field-effect transistor at high frequency may induce significant switching losses, which have a great proportion in total power losses. Especially in the case of higher temperature, switching losses increased tangibly. A novel temperature adaptive gate driver with low power consumption in a high-temperature environment is proposed for switched-mode power supply by the temperature compensation technique. It has been realised to decrease the switching losses in wide scope temperature, and cannot sacrifice performance of the electromagnetic interferences, by regulating di/dt and dv/dt of switching curve in high temperature. A 0.25 μm, 40 V bipolar-CMOS-DMOS (BCD) process technology is utilised and experimental circuits and results are then presented. Compared with the conventional gate driver, the turn-on loss and turn-off loss of the temperature adaptive gate driver can be reduced, respectively, by 17% and 22%. At present, it has been used in an AC-DC converter to improve work efficiency.
An analytical model is proposed to analyse the energy recovery circuit (ERC) efficiency of plasma display panel (PDP) data driver integrated circuit (IC). The experimental measurements agree with the analysis results very well. The analysis results show that the ERC efficiency of PDP data driver IC is influenced by three factors: the value of charge time T ERC , the channel resistor R on and the capacitance of C L. The range of T ERC is restricted in actual PDP system. C L is determined by physical parameters of PDP panel, and its value is nearly changeless. Therefore the ERC efficiency of PDP data driver IC can be improved significantly by using superior DPLD (double-channel p-type lateral extended drain metal oxidesemi conductor) transistor that has smaller R on .
A relative humidity sensor based on a silver nano-grating was proposed. By stripping and cleaning commercially available CD and DVD discs, polycarbonate plates with different grating periods are obtained. These plates as templates are coated with a layer of sputtered silver film to form silver nano-gratings, which exhibit refractive index sensing sensitivities of 517 nm/RIU and 742.9 nm/RIU, respectively. The finite-difference time-domain simulation results conform the excited surface plasmon polariton modes and localized surface plasmon modes on the nano-grating. By spin coating a layer of humidity-sensitive porous silica with optimized thickness, the silver nano-grating shows a relative humidity detection sensitivity of 0.23 nm/%RH.
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