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SIMULATIONS WITH THE BUCK TOPOLOGY EE562: POWER ELECTRONICS I COLORADO STATE UNIVERSITY
SIMULATIONS WITH THE BUCK TOPOLOGY EE562: POWER ELECTRONICS I COLORADO STATE UNIVERSITY

600 Watt SMB Transient Voltage Suppressor, 12 V, Bidirectional
600 Watt SMB Transient Voltage Suppressor, 12 V, Bidirectional

... voltage to the clamp voltage as shown in Figure 4. The inductive effects in the device are due to actual turn-on time (time required for the device to go from zero current to full current) and lead inductance. This inductive effect produces an overshoot in the voltage across the equipment or compone ...
DM74LS04 Hex Inverting Gates
DM74LS04 Hex Inverting Gates

ACS755xCB-130 - Allegro Microsystems
ACS755xCB-130 - Allegro Microsystems

Presentation by Marioan Piekutowski ( pptx , 59 kB ) - SC B4
Presentation by Marioan Piekutowski ( pptx , 59 kB ) - SC B4

... SCR < 2 indicate potential problems with commutation failures, harmonics, phase unbalance, instability (v and/or f) ...
T2X UPS System - PHD Powerhouse
T2X UPS System - PHD Powerhouse

A.
A.

Slide Link
Slide Link

Electricity
Electricity

ACS755xCB-100 - Allegro Microsystems
ACS755xCB-100 - Allegro Microsystems

Review III Op Amps
Review III Op Amps

... amp used as a switch (no feedback), inverting and non-inverting amplifiers, inverting and non-inverting summers, voltage follower, difference amplifier. Example: See Op Amp Cookbook on Recognizing Inverting & Non-Inverting Amplifiers (see links online). More Examples: See all of the Op Amp HW & Simi ...
spec sheet - Spring Electronics
spec sheet - Spring Electronics

Review II
Review II

Super-emissive cathode switches - Electrobionics
Super-emissive cathode switches - Electrobionics

Document
Document

... • The resonance of a series RLC circuit occurs when the inductive and capacitive reactances are equal in magnitude but cancel each other because they are 180 degrees apart in phase. The sharp minimum in impedance which occurs is useful in tuning applications. The sharpness of the minimum depends on ...
Ohm`s Law
Ohm`s Law

... Your bedroom lights are four 60 W bulbs. a) If they are each hooked up to 120V, how much current do they each draw? b) What is the resistance of each bulb? c) If the lights are on for 3 hours a day, how much energy (in kWh) do they consume in 30 days? d) If electricity costs $0.12 per kWh, how much ...
Bipolar Power Transistor 30V 1.5A PNP PCP
Bipolar Power Transistor 30V 1.5A PNP PCP

... In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of ...
THE EXPANDING PROBLEM OF HIGH FREQUENCY NOISE
THE EXPANDING PROBLEM OF HIGH FREQUENCY NOISE

... Conducted high frequency noise is any signal of greater than 1000 times the fundamental power frequency (60Hz) with a magnitude of less than twice the RMS voltage of the distribution system. This definition includes low level impulses. Interference with digital processing occurs when high frequency ...
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ULN2801A

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RH111

... required to drive the output within a volt of either supply with a 1mA load. These parameters define an error band and take into account the worstcase effects of voltage gain and input impedance. Note 5: Response time is specified for a 100mV input step with 5mV overdrive with the collector output t ...
DESIGN-AND-SIMULATION-OF-DIFFERENT
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... comparing two input frequencies in terms of both phase and frequency [1]. In a PLL the two frequencies are reference frequency (Fref) and the voltage controlled oscillator (VCO) output after division by N (Fvco). The output is a pulse proportional to the phase difference between the inputs and it dr ...
Oscillator Notes 2
Oscillator Notes 2

... How do you reduce power dissipation in a LO buffer amplifier? The bias current of the amplifier is directly related to the output voltage swing and RL. If the supply voltage is fixed, then you can reduce current to save power. 1. Increase RL. This may be practical in situations where the frequency ...
BT-70129 - Bren
BT-70129 - Bren

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DM74LS32 Quad 2-Input OR Gate - Inf

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DC Circuits, Practical Problems

... A. Clearly Sketch and label a circuit diagram modeling the ceiling lamp. The lamps are the only elements using energy in the circuit . The circuit is protected by a 15 amp circuit breaker. B. Calculate the current through each individual bulb. C. Discuss relationships that exists between individual ...
< 1 ... 1880 1881 1882 1883 1884 1885 1886 1887 1888 ... 2207 >

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.
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