Protocol for communication between secondary side and primary side of isolated switching power converters
First Claim
1. A power converter system, comprising:
- a switching power converter having a primary side and a secondary side that are electrically isolated from each other;
a first controller on the primary side of the switching power converter, the first controller controlling a switch coupled to a primary winding on the primary side in the switching power converter on or off at a switching frequency of the switching power converter to regulate an output voltage of the switching power converter;
a second controller on the secondary side of the switching power converter, the second controller encoding information into one or more pulses such that a first duration between consecutive ones of the pulses corresponds to a first logic level and a second duration between consecutive ones of the pulses corresponds to a second logic level, the second duration being greater than the first duration; and
a communication channel for transmitting the encoded information from the second controller to the first controller while maintaining electrical isolation between the primary side and the secondary side,the first controller further generating a control signal to turn on or off the switch to regulate the output voltage, based on the encoded information and a feedback voltage across an auxiliary winding coupled to the primary winding.
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Abstract
A power converter system comprises a switching power converter having a primary side and a secondary side that are electrically isolated from each other. A first controller on the primary side of the switching power converter controls a switch in the switching power converter on or off at a switching frequency of the switching power converter to regulate an output voltage of the switching power converter. A second controller on the secondary side of the switching power converter encodes information into one or more pulses such that a first duration between the consecutive pulses corresponds to a first logic level and a second duration between the consecutive pulses corresponds to a second logic level, the second duration being greater than the first duration.
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Citations
20 Claims
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1. A power converter system, comprising:
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a switching power converter having a primary side and a secondary side that are electrically isolated from each other; a first controller on the primary side of the switching power converter, the first controller controlling a switch coupled to a primary winding on the primary side in the switching power converter on or off at a switching frequency of the switching power converter to regulate an output voltage of the switching power converter; a second controller on the secondary side of the switching power converter, the second controller encoding information into one or more pulses such that a first duration between consecutive ones of the pulses corresponds to a first logic level and a second duration between consecutive ones of the pulses corresponds to a second logic level, the second duration being greater than the first duration; and a communication channel for transmitting the encoded information from the second controller to the first controller while maintaining electrical isolation between the primary side and the secondary side, the first controller further generating a control signal to turn on or off the switch to regulate the output voltage, based on the encoded information and a feedback voltage across an auxiliary winding coupled to the primary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19)
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13. A method for communicating information from a secondary side of a switching power converter in a power converter system to a primary side of the switching power converter, the power converter system comprising a first controller on the primary side of the switching power converter, a second controller on the secondary side of the switching power converter, and a communication channel maintaining electrical isolation between the primary side and the secondary side, the method comprising:
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controlling a switch coupled to a primary winding on the primary side in the switching power converter on or off at a switching frequency of the switching power converter by the first controller to regulate an output voltage of the isolated switching power converter; encoding information into one or more pulses by the second controller such that a first duration between consecutive ones of the pulses corresponds to a first logic level and a second duration between consecutive ones of the pulses corresponds to a second logic level, the second duration being greater than the first duration; transmitting the encoded information from the second controller to the first controller via the communication channel while maintaining electrical isolation between the primary side and the secondary side; and generating a control signal to turn on or off the switch to regulate the output voltage, based on the encoded information and a feedback voltage across an auxiliary winding coupled to the primary winding. - View Dependent Claims (14, 15, 16, 17, 18, 20)
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Specification