Isolated Switched-mode Power Supply With Output Regulation From Primary Side
First Claim
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1. An electronic circuit, comprising:
- a switched-mode power supply with an input side and an output side isolated from each other,a sensing element coupled to said output side of said switched-mode power supply, generating a sensing current based on an output voltage on said output side of said switched-mode power supply, anda measuring means coupled to said input side of said switched-mode power supply, to measure a scaled version of said sensing current and then to calculate an estimate voltage representing said output voltage on said output side of said switched-mode power supply,said switched mode power supply regulating said output voltage based on said estimate voltage,whereby said output voltage on said output side of said switched-mode power supply can be regulated from said input side of said switched-mode power supply.
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Abstract
Embodiments disclosed herein describe an isolated switched-mode power supply with its output regulated from the primary side, by generating a sensing current using a sensing element coupled to the output of the power supply, and measuring a scaled version of the sensing current which depends on the output voltage, and calculating an estimate voltage representing the output voltage, and regulating the output of the isolated switched-mode power supply based on the estimate voltage.
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Citations
20 Claims
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1. An electronic circuit, comprising:
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a switched-mode power supply with an input side and an output side isolated from each other, a sensing element coupled to said output side of said switched-mode power supply, generating a sensing current based on an output voltage on said output side of said switched-mode power supply, and a measuring means coupled to said input side of said switched-mode power supply, to measure a scaled version of said sensing current and then to calculate an estimate voltage representing said output voltage on said output side of said switched-mode power supply, said switched mode power supply regulating said output voltage based on said estimate voltage, whereby said output voltage on said output side of said switched-mode power supply can be regulated from said input side of said switched-mode power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A switched-mode power supply, comprising:
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an energy transfer element with a primary side and a secondary side isolated from each other, at least a power switch coupled to said primary side of said energy transfer element, at least a rectifying element coupled to said secondary side of said energy transfer element, and an energy storage element coupled to said rectifying element, a control means to control said power switch on and off to let energy transferred from said primary side to said secondary side of said energy transfer element, then to said energy storage element through said rectifying element, and a sensing element coupled to said energy storage element, generating a sensing current based on an output voltage on said energy storage element, and a measuring means coupled to said primary side of said energy transfer element, to measure a scaled version of said sensing current and therefore to calculate an estimate voltage representing said output voltage on said energy storage element, said estimate voltage used by said control means to control said power switch, whereby said output voltage on said energy storage element at said secondary side of said energy transfer element can be regulated from said primary side of said energy transfer element. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method to regulate an output voltage of an output side of an isolated switched-mode power supply from an input side of said isolated switched-mode power supply, comprising steps of:
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(a) measuring a scaled version of a sensing current at said input side of said isolated switched-mode power supply, said sensing current generated by a sensing element coupled to said output side of said isolated switched-mode power supply, and said sensing current depending on said output voltage of said output side of said isolated switched-mode power supply, an input power supply voltage at said input side of said isolated switched-mode power supply, the resistance value of said sensing element, and a transfer ratio of said isolated switched-mode power supply, and (b) calculating an estimate voltage which representing said output voltage of said output side of said isolated switched-mode power supply, based on said scaled version of said sensing current measured, said input power supply, the resistance value of said sensing element, and said transfer ratio, and (c) regulating said output voltage of said output side from said input side of said isolated switched-mode power supply based on said estimate voltage.
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Specification