Power supply and method for compensating low-frequency output voltage ripple thereof
AssigneeAcbel Polytech Inc.
InventorChia-An Yeh
Life of this patent
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Abstract
A power supply has a power factor correction (PFC) circuit and a DC to DC conversion circuit. A DC to DC controller of the DC to DC conversion circuit acquires zero-crossing information and load information from the PFC circuit through a communication protocol, and performs a low-frequency compensation on a control command using a table-mapping means, thereby resolving the issues of higher controller complexity, changes of entire response characteristics and cost increase in conventional compensation technique.
Claims18
A method for compensating low-frequency output voltage ripple of a power supply, wherein the power supply has a power factor correction (PFC) circuit and a DC (Direct Current) to DC conversion circuit, the DC to DC conversion circuit has a DC to DC controller performing the method, the method comprising steps of:
- providing a mapping table with multiple compensation signals built in the DC to DC controller;
- continuously acquiring zero-crossing information of an AC (Alternating Current) power from the PFC circuit;
- determining if a zero-crossing of the AC input power is taking place according to the zero-crossing information;
- and
- selecting a corresponding compensation signal from the mapping table to compensate a control command when the zero-crossing of the AC input power is taking place.
A power supply, comprising:
- a power factor correction (PFC) circuit having a PFC controller connected to an AC (Alternating Current) power to detect and provide zero-crossing information of the AC input power;
- and
- a DC (Direct Current) to DC conversion circuit having a DC to DC controller connected to the PFC controller through a communication protocol to acquire the zero-crossing information of the AC input power, wherein the DC to DC controller has a control unit built in with a mapping table with multiple compensation signals, and the control unit locates one of the compensation signals from the mapping table to compensate an original control command according to the acquired zero-crossing information of the AC input power.
Dependencies are inferred from the claim text.