the importance of ripple & noise for power supplies · powerpoint-presentatie author: wasila...
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The importance of ripple & noise for power supplies
Hiroshi Terui, Daitron Japan on behalf of A&C Solutions
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Are you troubled by the noise?
+
-Switching Power Supply
AC(L)
AC(N)
FG
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Topics
1. What is ripple & noise?
2. Effects of ripple & noise
3. Reducing ripple & noise at source
4. Conducted emission
5. Radiated emission
6. Applications for low noise power supplies
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1. What is ripple noise?
Ripple = the residual periodic variation of the DC voltage within a power supply which has been derived from an alternating current (AC) sourceNoise = is the switching noise generated by the switching frequency of the power supply
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2. Effects of ripple & noise
Ripple & noise will be the reason of malfunction or performance degradation for a customer’s application.
Malfunction or
degradation
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3.1. Reducing ripple & noise at the source
Soft-switching topologyThe topology creates a clean current wave. Our engineers carefully designed current and voltage timing synchronized at the "Zero-Cross (ZVS*1, ZCS*2)" point. This ensures that the power supply operates at the lowest possible noise level.1.ZVS : Zero volt switching : switching with zero voltage 2.ZCS : Zero current switching : switching with zero current
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3.2. Reducing ripple & noise at the source
A lot of ringing occurs at hard switching Little ringing occurs at soft switching
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3.3. Reducing ripple & noise at the sourceTypical power supply 50W, 5Vdc Low noise power supply 50W, 5Vdc
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4. Conducted emissionTypical power supply 50W, 5Vdc Low noise power supply 50W, 5Vdc
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5. Radiated emissionTypical power supply 50W, 5Vdc Low noise power supply 50W, 5Vdc
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6. Applications for low noise power supplies
• High precision measurement equipment• Microscopy • Medical equipment• Audio
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Please visit us at stand 25 to see the
complete range of low noise power
supplies
www.ac-solutions.be
www.daitronpower.com