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Circuit arrangement and method for reducing common mode noise in a switched mode power supply and switched mode power supply
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A switching mode power supply and circuit device technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as inefficiency
Inactive Publication Date: 2016-01-20
SALCOMP OYJ
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These have similar disadvantages as transformer constructions with only coils
[0008] The problem associated with the above techniques is that they are inefficient at reducing common mode noise and may even themselves generate significant capacitive currents in switch mode power supplies
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[0040] Respectively figure 1 and figure 2 Examples of typical primary and secondary voltage waveforms are shown in . The primary voltage waveform includes the overshoot that occurs when the primary stops conducting. use figure 1 The dotted circle in the depicts the overshoot. The secondary voltage waveform is not included as can be seen in the figure 2 Such overshoot as seen in .
[0041] image 3 is a schematic diagram of a flyback type switch mode power supply according to the first embodiment of the present invention. The flyback power supply 300 includes a primary filter capacitor 301 , a primary switch 305 , a transformer with a primary winding 302 , a secondary winding 303 and an auxiliary winding 304 , and a rectifier diode 306 . Windings 302, 303 and 304 are inductively coupled through a transformer. The auxiliary winding 304 is connected to a stable potential in the primary side, in this case to a primary filter capacitor 301 , which in turn is connected to ...
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Abstract
The present invention relates to a circuit arrangement for reducing common-mode noise in a switched-mode power supply (300, 400), the circuit arrangement being coupled between a primary winding (302, 402, 502) and a secondary winding (303, 403, 503) of a transformer, the circuit arrangement comprising a first capacitor (309, 409) adapted to capacitively couple the primary winding (302, 402, 502) and the secondary winding (303, 403, 503). The circuit arrangement further comprises an auxiliary winding (304, 404, 504) and an impedance circuit (307, 308, 407, 408), said auxiliary winding (304, 404, 504) and said impedance circuit (307, 308, 407, 408) being coupled between the primary winding (302, 402, 502) and the first capacitor (309, 409). The invention also relates to a method for reducing common-mode noise in a switched- mode power supply, and a switched-mode power supply (300, 400).
Description
technical field [0001] The present invention relates to circuit arrangements and methods for reducing common mode noise in switched mode power supplies. The invention also relates to a switched mode power supply incorporating a circuit arrangement for reducing common mode noise. Background technique [0002] Switched Mode Power Supplies (SMPS) are widely used in various technical applications, mainly due to their high efficiency and compact size. The high efficiency is the result of the use of switching technology in which high-frequency pulsed currents are fed to the transformer. A disadvantage of this technology is that SMPSs generate both conducted and radiated electromagnetic interference (EMI). [0003] A traditional switch mode power supply consists of a primary side and a secondary side separated from each other by a transformer. A transformer has primary and secondary windings wound on a common core element. A pulsed current fed to the primary winding generates a...
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