Switching power converter for suppressing common mode noise
First Claim
1. A switching power converter comprising:
- an inductive component;
a capacitive component;
at least a switch having at least a terminal wherein said switch turning on and off alternatively which generates a plurality of noise voltages;
said noise voltage having a jump point and a static point;
said jump point is one of said inductive component terminals, said capacitive component terminals and said second and third terminal of the switch; and
an additional impedance connected between the static point and the jump point of different noise voltage to neutralize common noise current.
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Abstract
The present invention discloses a switching power converter with low common mode noise. The switching power converter comprises at least a switch with at least a terminal wherein said switch turning on and off alternatively which generates a plurality of noise voltages, and the noise voltage having a jump point and a static point wherein the jump point is one of said inductive component terminals, the capacitive component terminals and the second and third terminal of the switch; and an additional impedance connected between the static point and the jump point of different noise voltage to neutralize common noise current. In addition, another switching power converter having primary side and secondary side can be used to reduce the common mode noise by adding some additional impedance between the static points and jump points of the primary side and secondary side.
9 Citations
12 Claims
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1. A switching power converter comprising:
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an inductive component; a capacitive component; at least a switch having at least a terminal wherein said switch turning on and off alternatively which generates a plurality of noise voltages; said noise voltage having a jump point and a static point; said jump point is one of said inductive component terminals, said capacitive component terminals and said second and third terminal of the switch; and an additional impedance connected between the static point and the jump point of different noise voltage to neutralize common noise current. - View Dependent Claims (2, 3)
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4. A switching power converter comprising:
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a transformer having a primary winding and a secondary winding, wherein said primary winding and said secondary winding have winding terminals; at least a switch having a first terminal to control the switch, a second and a third terminal, said switch turning on and off alternatively which generates a primary noise voltage and a secondary noise voltage, wherein said primary noise voltage and said secondary noise voltage having a jump point and a static point; said jump point comprising one of said winding terminals and said second and third terminal of said switch; and an additional impedance connected between said primary noise voltage and said secondary noise voltage to neutralize common noise current. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification