2004 Mid-Term Exam and Solutions
... Auxochrome refers to a molecular substituent which itself is not optically active but nevertheless has an effect on a neighbouring group by shifting its absorptin position and intensity. 8. Both of these op amps are configured as integrators and are given the same time constants. The inputs both go ...
... Auxochrome refers to a molecular substituent which itself is not optically active but nevertheless has an effect on a neighbouring group by shifting its absorptin position and intensity. 8. Both of these op amps are configured as integrators and are given the same time constants. The inputs both go ...
HV sedici imp. Inglese
... The device is provided with several electronic protections which protect the amplifier from dangerous or wrong functioning conditions , avoiding to interfere with the music signal in order to get the best performances in every condition. - Outputs protection: any type of short circuit on the speaker ...
... The device is provided with several electronic protections which protect the amplifier from dangerous or wrong functioning conditions , avoiding to interfere with the music signal in order to get the best performances in every condition. - Outputs protection: any type of short circuit on the speaker ...
開啟檔案
... 1.解決以前只能控制high or low duty的情況。 2.不需要使用任何hall or position sensor=用未激磁相量測到 的端電壓來計算反電動勢的零交越點，產生正確的換相控制。 3.容易使用數位系統來實現=使用FPGA架構來實現BLDC Driver System。 ...
... 1.解決以前只能控制high or low duty的情況。 2.不需要使用任何hall or position sensor=用未激磁相量測到 的端電壓來計算反電動勢的零交越點，產生正確的換相控制。 3.容易使用數位系統來實現=使用FPGA架構來實現BLDC Driver System。 ...
pulse modulation
... Uniform format for different kind of base-band signals. Flexible TDM. Secure communication through the use of special modulation schemes of encryption. These advantages are obtained at the cost of more complexity and increased BT. With cost-effective implementations, the cost issue no long ...
... Uniform format for different kind of base-band signals. Flexible TDM. Secure communication through the use of special modulation schemes of encryption. These advantages are obtained at the cost of more complexity and increased BT. With cost-effective implementations, the cost issue no long ...
Common source inductance introduced self-turn-on in
... • Increasing ringing magnitude in drain-source voltage and huge spikes in gate-source voltage are the key features. • In the worst case, the ringing is not damped and keeps going until power supply is killed. In other words, the control of the switch is lost. • Adverse effect of common source induct ...
... • Increasing ringing magnitude in drain-source voltage and huge spikes in gate-source voltage are the key features. • In the worst case, the ringing is not damped and keeps going until power supply is killed. In other words, the control of the switch is lost. • Adverse effect of common source induct ...
Printable PDF File Format
... Portable in the shop or at the job site —at 41 lb the CST 280 is easily moved from location to location. Superior Stick arc performance even on the difficult-to-run electrodes like E6010. Adaptive Hot Start ™ for Stick arc starts automatically increases the output amperage at the start of a weld sho ...
... Portable in the shop or at the job site —at 41 lb the CST 280 is easily moved from location to location. Superior Stick arc performance even on the difficult-to-run electrodes like E6010. Adaptive Hot Start ™ for Stick arc starts automatically increases the output amperage at the start of a weld sho ...
lecture1 - Docjava.com
... SNR = signal to noise ratio Log(Signal power / noise power) to base 10. This is named after Alexander Grahm Bell It is called the decibel (dB). ...
... SNR = signal to noise ratio Log(Signal power / noise power) to base 10. This is named after Alexander Grahm Bell It is called the decibel (dB). ...
DM32711716
... In rectifier operation i.e. 1st and 3rd quadrant PWM reference sin wave amplitude ( Vxmod) lags the converter input voltage( Vx) in this case inptut current and input voltage is same direction as shown as above fig 12(b). Under this condition, the control Block takes power from the supply by generat ...
... In rectifier operation i.e. 1st and 3rd quadrant PWM reference sin wave amplitude ( Vxmod) lags the converter input voltage( Vx) in this case inptut current and input voltage is same direction as shown as above fig 12(b). Under this condition, the control Block takes power from the supply by generat ...
UNIT-IV 1. List the advantages of crystal oscillator The advantages
... b) High frequency of operation c) Atomatic amplitude control ...
... b) High frequency of operation c) Atomatic amplitude control ...
Soft-switching of the full-bridge converter switches must
... losses. The details of events during the deadtime are provided and not repeated here. The focus of the paper is mostly on the auxiliary circuits and their application in a typical full-bridge dc–dc converter. ...
... losses. The details of events during the deadtime are provided and not repeated here. The focus of the paper is mostly on the auxiliary circuits and their application in a typical full-bridge dc–dc converter. ...
IES - Intro and MCU Design
... Memory • Most MCUs have on-chip memory for code + data • Might need more: expand it – Expansion mode – Microprocessor mode – Uses many pins – Limits I/O ...
... Memory • Most MCUs have on-chip memory for code + data • Might need more: expand it – Expansion mode – Microprocessor mode – Uses many pins – Limits I/O ...
FAN6862 Highly Integrated Green-Mode PWM Controller
... Each time the power MOSFET is switched on, a turn-on spike occurs across the sense-resistor caused by primary-side capacitance and secondary-side rectifier reverse recovery. To avoid premature termination of the switching pulse, a leading-edge blanking time is built in. During this blanking period ( ...
... Each time the power MOSFET is switched on, a turn-on spike occurs across the sense-resistor caused by primary-side capacitance and secondary-side rectifier reverse recovery. To avoid premature termination of the switching pulse, a leading-edge blanking time is built in. During this blanking period ( ...
FDMF6833C — Extra-Small, High-Performance, High-Frequency DrMOS Module FDMF6833C — Extra-Small, Hig Benefits
... With an integrated approach, the complete switching power stage is optimized with regard to driver and MOSFET dynamic performance, system inductance, and power MOSFET RDS(ON). XS™ DrMOS uses ...
... With an integrated approach, the complete switching power stage is optimized with regard to driver and MOSFET dynamic performance, system inductance, and power MOSFET RDS(ON). XS™ DrMOS uses ...
INGEPAC PQM300 flyer
... ∙∙ Different hardware configuration options allowing to choose the most suitable one for each application. ∙∙ Large storage capacity allowing to keep the recordings in the non volatile memory of the equipment for a remarkable period of time before downloading them. Programmable recording frequency. ...
... ∙∙ Different hardware configuration options allowing to choose the most suitable one for each application. ∙∙ Large storage capacity allowing to keep the recordings in the non volatile memory of the equipment for a remarkable period of time before downloading them. Programmable recording frequency. ...
LED770x LED drivers New monolithic step-up family driving LEDs
... converter and six integrated PWM-dimmable current generators. The boost section is based on a constant switchingfrequency, peak current-mode architecture. The devices keep the lowest row’s voltage regulated at the internal reference voltage, and adapt the boost output voltage to reduce power losses ...
... converter and six integrated PWM-dimmable current generators. The boost section is based on a constant switchingfrequency, peak current-mode architecture. The devices keep the lowest row’s voltage regulated at the internal reference voltage, and adapt the boost output voltage to reduce power losses ...
Pulse-width modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.