Low-noise multi-output power supply circuit and control method thereof
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorWei Chen
Life of this patent
Estimating the term…
Abstract
Disclosed herein are low-noise multi-output power supply circuits and methods. In one embodiment, a method of controlling a low-noise multi-output power supply circuit, can include: (i) detecting operation states of each of a plurality of switch mode power supplies; (ii) generating a frequency modulation signal to control an operating frequency of a switch mode power supply to be substantially equal to a main frequency signal when the switch mode power supply is detected to operate in a heavy-load steady state; and (iii) controlling the operating frequency of the switch mode power supply to be independent of the main frequency signal when the switch mode power supply is detected to operate in a light-load or a dynamic state.
Claims9
A method of controlling a low-noise multi-output power supply circuit, the method comprising:
- a) detecting operation states of each of a plurality of switch mode power supplies;
- b) generating a frequency modulation signal to control an operating frequency of a switch mode power supply to be substantially equal to a main frequency signal when said switch mode power supply is detected to operate in a heavy-load steady state;
- c) controlling said operating frequency of said switch mode power supply to be independent of said main frequency signal when said switch mode power supply is detected to operate in a light-load or a dynamic state;
- d) shifting a phase of said main frequency signal;
- and
- e) controlling each of said plurality of switch mode power supplies to operate in an interleaved-phase state.
A low-noise multi-output power supply circuit, comprising:
- a) a plurality of switch mode power supplies;
- b) a plurality of detection circuits configured to detect operation states of each of said plurality of switch mode power supplies;
- c) a plurality of frequency modulation circuits configured to receive a main frequency signal, and to generate a plurality of frequency modulation signals corresponding to said plurality of switch mode power supplies, wherein said plurality of switch mode power supplies comprises a plurality of phase shift circuits configured to receive said main frequency signal, and to generate a phase shifted output to said plurality of frequency modulation circuits to control each of said plurality of switch mode power supplies to operate in an interleaved-phase state;
- d) a frequency modulation signal being configured to control an operating frequency of a switch mode power supply to be substantially the same as said main frequency signal when said switch mode power supply is detected to operate in a heavy-load steady state;
- and
- e) said frequency modulation signal being disallowed such that said operating frequency of said switch mode power supply is independent of said main frequency signal when said switch mode power supply is detected to operate in a light-load or a dynamic state.
Dependencies are inferred from the claim text.