Considerations in grounding and shielding by Macatee S.R.

By Macatee S.R.

Show description

Read or Download Considerations in grounding and shielding computer-controlled audio devices PDF

Best electronics: radio books

Theory of defects in semiconductors

Semiconductor technology and know-how is the paintings of illness engineering. The theoretical modeling of defects has greater dramatically during the last decade. those instruments at the moment are utilized to a variety of fabrics matters: quantum dots, buckyballs, spintronics, interfaces, amorphous structures, and so forth.

Contamination-Free Manufacturing for Semiconductors and Other Precision Products

Spotting the necessity for stronger regulate measures within the production means of hugely sensitized semiconductor expertise, this sensible reference offers in-depth and complex therapy at the origins, tactics, and disposal of a number of contaminants. It makes use of modern examples in keeping with the most recent and processing gear to demonstrate formerly unavailable effects and insights besides experimental and theoretical advancements.

Analogue IC Design: The Current-Mode Approach (EII Circuits and Systems Series) (Eii Circuits and Systems Series)

Analogue IC layout has develop into the fundamental booklet protecting the current-mode method of built-in circuit layout. The method has sparked a lot curiosity in analogue electronics and is associated with vital advances in built-in circuit expertise -- equivalent to CMOS VLSI which permits combined analogue and electronic circuits, and high-speed GaAs processing.

Extra resources for Considerations in grounding and shielding computer-controlled audio devices

Sample text

This requires that ia = (i2 + i3). i3 +48 volts i2 +15 volts i 1(t) + – Stage 1 + ou v Zg1 ib Z g2 new ground connection ECEN 5797 Power Electronics 1 Stage 3 – 2 – Stage 2 + v in t1 + – i2 + i 3 v in2 = v out 1 – Zg1 i b ia 34 Department of Electrical and Computer Engineering University of Colorado at Boulder i3 +48 volts i2 +15 volts i 1(t) + – Stage 1 2 ou v ib v in Zg1 1:1 – Stage 2 + + t1 + – ib Stage 3 – i2 + i 3 Zg2 ia = i2 + i 3 The common-mode choke forces the high frequency return current (i2 + i3) to flow through the alternate ground path: ia = (i2 + i3).

Measurement of common mode current current probe iCM interwinding capacitance The common mode current due to transformer interwinding capacitance can be easily measured using a current probe iDM iCM to oscilloscope The differential-mode current iDM(t) cancels out, and the oscilloscope will display 2iCM(t). ECEN 5797 Power Electronics 1 29 Department of Electrical and Computer Engineering University of Colorado at Boulder A Common-Mode Choke signal i CM LM 1:1 iDM return i CM Equivalent circuit, including magnetizing inductance: IDEAL 1:1 return i CM LM signal iDM i CM ECEN 5797 Power Electronics 1 30 Department of Electrical and Computer Engineering University of Colorado at Boulder Operation of Common-Mode Choke Differential mode + 0V – LM signal iDM IDEAL 1:1 return iDM iDM iDM cancels out in windings, with no net magnetization of core.

To the extent that the leakage inductance can be neglected, the commonmode choke has no effect on the differential-mode currents. Common mode + 2LM LM signal i CM – 2i CM iCM iCM IDEAL 1:1 return di CM dt i CM ECEN 5797 Power Electronics 1 The common-mode currents effectively add, magnetizing the core. The common-mode choke presents inductance LM to filter these currents. i CM 31 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of a common-mode choke to reduce the magnitude of currents in transformer interwinding capacitances iCM LM 1:1 Vg iDM D1 + – iCM Q1 – V + iCM + vsg (t) – iCM Common-mode choke inserts inductance LM to oppose flow of highfrequency common-mode currents ECEN 5797 Power Electronics 1 32 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of common-mode chokes to filter the power supply input and output CCMF + – D1 1:1 Vg 1:1 CCMF – V + CCMF CCMF The common-mode chokes, along with the capacitors CCMF, form two-pole low pass filters which oppose the flow of high-frequency common-mode currents ECEN 5797 Power Electronics 1 33 Department of Electrical and Computer Engineering University of Colorado at Boulder Use of a common-mode choke to prevent corruption of ground reference voltage Back to example of slide #14: Attempt to prevent coupling of signal (i2 + i3) into input signal vin2 by adding another ground connection, for conduction of return current (i2 + i3).

Download PDF sample

Rated 4.09 of 5 – based on 12 votes