Design Challenges in Backlighting LCD TVs
... grow to 50-million units in 2007. LCD panels are actually electronically controlled light valves that require a backlight source in order to produce a visible image. LCD TVs typically use cold-cathode fluorescent lamps (CCFLs) for this purpose. Other technologies such as light-emitting diodes (LEDs) ...
... grow to 50-million units in 2007. LCD panels are actually electronically controlled light valves that require a backlight source in order to produce a visible image. LCD TVs typically use cold-cathode fluorescent lamps (CCFLs) for this purpose. Other technologies such as light-emitting diodes (LEDs) ...
International Electrical Engineering Journal (IEEJ) Vol. 5 (2014) No.12, pp. 1703-1710
... the functions of both DSTATCOM and DVR [7, [8].The UPQC consists of two voltage-source converters (VSCs) that are connected to a common dc bus. One of the VSCs is connected in series with a distribution feeder, while the other one is connected in shunt with the same feeder. The dc links of both VSCs ...
... the functions of both DSTATCOM and DVR [7, [8].The UPQC consists of two voltage-source converters (VSCs) that are connected to a common dc bus. One of the VSCs is connected in series with a distribution feeder, while the other one is connected in shunt with the same feeder. The dc links of both VSCs ...
cdv/dt induced turn-on in synchronous buck regulators
... A detailed representation of Q2 in a synchronous buck regulator is illustrated in Figure 4. During the turn on switching period of Q1, the full input voltage does not immediately appear at drain of Q2 because of the miller effect and turn-on delay at MOSFET Q1. The drain voltage imposed on Q2 induce ...
... A detailed representation of Q2 in a synchronous buck regulator is illustrated in Figure 4. During the turn on switching period of Q1, the full input voltage does not immediately appear at drain of Q2 because of the miller effect and turn-on delay at MOSFET Q1. The drain voltage imposed on Q2 induce ...
Design and Simulation of High Speed Low Power CMOS
... The inverter-based amplifier topology shown in Figure 6 uses CMOS inverters as the amplifier input. This input stage design has the advantage of combining the transconductance of the n and p transistors. This combination of the two transconductance should provide 6dB increase in gain over a traditio ...
... The inverter-based amplifier topology shown in Figure 6 uses CMOS inverters as the amplifier input. This input stage design has the advantage of combining the transconductance of the n and p transistors. This combination of the two transconductance should provide 6dB increase in gain over a traditio ...
Efficient Control Scheme for Five-level (NPC) Shunt Active Power
... active power filter based on five-level (NPC) inverter which can mitigate current harmonics generated by nonlinear loads and compensate reactive power. Today, five-level inverter is strongly used in the medium and high voltage applications; these advantages are low harmonic distortions, low switchin ...
... active power filter based on five-level (NPC) inverter which can mitigate current harmonics generated by nonlinear loads and compensate reactive power. Today, five-level inverter is strongly used in the medium and high voltage applications; these advantages are low harmonic distortions, low switchin ...
The Cathodyne Phase Inverter
... Fig. 12.9: Cathode-bias variations which maintain equal anode and cathode loading. The version in fig. 12,9b ensures symmetry down to DC without resorting to an LED, by placing an extra resistor –equal to Rb– in the anode circuit, so the total load resistances are equalised. The electrolytic bypass ...
... Fig. 12.9: Cathode-bias variations which maintain equal anode and cathode loading. The version in fig. 12,9b ensures symmetry down to DC without resorting to an LED, by placing an extra resistor –equal to Rb– in the anode circuit, so the total load resistances are equalised. The electrolytic bypass ...
High Pressure Sodium Lamps
... release light energy. Starting the arc sometimes takes a few seconds, and the warm-up period is generally about four minutes. During this time, the lamp exhibits different colors as more sodium vapor, enters the arc stream. If power is interrupted, even briefly, an HPS lamp’s arc will extinguish. Th ...
... release light energy. Starting the arc sometimes takes a few seconds, and the warm-up period is generally about four minutes. During this time, the lamp exhibits different colors as more sodium vapor, enters the arc stream. If power is interrupted, even briefly, an HPS lamp’s arc will extinguish. Th ...
Chapter 9 Maintenance and Troubleshooting
... from the connecting cabling and from the K2500 itself. Increasing the volume digitally can be accomplished in three different ways. You can increase the volume of all programs assigned to a given MIDI channel by selecting the CHANLS page in MIDI mode and setting the OutGain parameter to the desired ...
... from the connecting cabling and from the K2500 itself. Increasing the volume digitally can be accomplished in three different ways. You can increase the volume of all programs assigned to a given MIDI channel by selecting the CHANLS page in MIDI mode and setting the OutGain parameter to the desired ...
Superconducting IR magnets (F.S.Chen)
... • The grounding resistances of all coils were far less than requirement (20Mohm). ...
... • The grounding resistances of all coils were far less than requirement (20Mohm). ...
TPS548B22 1.5-V to 18-V VIN, 4.5-V to 22-V VDD, 25
... The TPS548B22 device is a compact single buck converter with adaptive on-time, D-CAP3 mode control. It is designed for high accuracy, high efficiency, fast transient response, ease-of-use, low external component count and space-conscious power systems. This device features full differential sense, T ...
... The TPS548B22 device is a compact single buck converter with adaptive on-time, D-CAP3 mode control. It is designed for high accuracy, high efficiency, fast transient response, ease-of-use, low external component count and space-conscious power systems. This device features full differential sense, T ...
Characteristic Impedance Of The Honey-comb Pick-up Strips
... different from leakage resistance of the dielectric separating the two conductors, and the metallic resistance of the wires themselves. • Characteristic impedance is purely a function of the capacitance and inductance distributed along the line's length, and would exist even if the dielectric were p ...
... different from leakage resistance of the dielectric separating the two conductors, and the metallic resistance of the wires themselves. • Characteristic impedance is purely a function of the capacitance and inductance distributed along the line's length, and would exist even if the dielectric were p ...
Resistance
... Ohm's law is not perfect and can only be applied for certain temperature ranges A conductor is called ohmic or linear if the resistivity in a certain temperature range does not depend on the value of the electric field ...
... Ohm's law is not perfect and can only be applied for certain temperature ranges A conductor is called ohmic or linear if the resistivity in a certain temperature range does not depend on the value of the electric field ...
International Electrical Engineering Journal (IEEJ) Vol. 6 (2015) No.2, pp. 1756-1764
... demand. In utility applications, a DSTATCOM provides leading or lagging reactive power to achieve system stability during transient conditions. The DSTATCOM can also be applied to industrial facilities to compensate for voltage sag and flicker caused by non-linear dynamic loads, enabling such proble ...
... demand. In utility applications, a DSTATCOM provides leading or lagging reactive power to achieve system stability during transient conditions. The DSTATCOM can also be applied to industrial facilities to compensate for voltage sag and flicker caused by non-linear dynamic loads, enabling such proble ...
Physics 30 Circuits
... - Made of a solid piece of semiconductor material with three terminals: an emmiter, a base, and a collector. This is known is a bipolar junction transistor. • Can control it's output in proportion to the input signal (amplifier) • Can also be used to turn current on or off in a circuit (electrically ...
... - Made of a solid piece of semiconductor material with three terminals: an emmiter, a base, and a collector. This is known is a bipolar junction transistor. • Can control it's output in proportion to the input signal (amplifier) • Can also be used to turn current on or off in a circuit (electrically ...
Resistive opto-isolator
Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.