System, module, and method for constant current controlling of power converter
AssigneeLien Chang Electronic Enterprise Co., Ltd.
InventorsChun-Kong Chan, Kuo-Jen Hsieh
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Abstract
A system, a module, and a method for constant current controlling of a power converter are disclosed. The constant current controlling system includes a power converter and a constant current controlling module. The power converter has a transformer and a switching unit. The switch unit is coupled with the primary coil of the transformer. The constant current controlling module is coupled with the transformer and the switching unit, for generating a discharge time and detecting a current waveform signal, before generating a control signal in order to adjust the duration of the switching period of the switching unit to ensure that an output current of the power converter may remain substantially the same.
Claims10
A constant current controlling system, comprising:
- a power converter having a transformer and a switching unit coupled with a primary coil of the transformer;
- a constant current controlling module coupled with the transformer and the switching unit, for generating a control signal in order to control a duration of a switching period of the switching unit according to an information of a discharge time and a current waveform signal, wherein the discharge time and the current waveform signal are received from a primary side of the transformer, the constant current controlling module including:
- a peak current value fixing unit coupled with the transformer and the switching unit, for fixing a peak current value of the current waveform signal flowing through the primary coil of the transformer;
- a discharge time detection unit coupled with the transformer, for generating the information of the discharge time;
- and
- a switching period regulation unit coupled with the switching unit, for generating the control signal according to the information of the discharge time.
A constant current controlling module, for a power converter having a transformer and a switching unit coupled with a primary coil of the transformer, comprising:
- a peak current value fixing unit coupled with the transformer and the switching unit, for receiving a current waveform signal from a primary side of the transformer, and staying a peak current value of the current waveform signal flowing through the primary coil of the transformer at a first predetermined value;
- a discharge time detection unit coupled with the transformer, for generating an information of a discharge time;
- and
- a switching period regulation unit coupled with the switching unit, for generating a control signal according to the information of the discharge time, in order to regulate a duration of a switching period of the switching unit.
A constant current controlling method, for a power converter having a transformer and a switching unit coupled with a primary coil of the transformer, comprising:
- receiving a current waveform signal flowing through the primary coil of the transformer and generating an information of a discharge time from a primary side of the transformer;
- staying a peak current value of the current waveform signal at a first predetermined value;
- and
- adjusting a duration of a switching period of the switching unit according to the information of the discharge time.
Dependencies are inferred from the claim text.