System and method for input current shaping in a power converter
First Claim
1. A power converter comprising:
- a power stage for transferring electrical power from a power source to a load;
a switch in the power stage that electrically couples or decouples the load to or from the power source; and
a switch controller coupled to the switch for controlling on-times and off-times of the switch according to a plurality of operation modes, the operation modes including a first operation mode selected if an input voltage to the power converter is in a first input voltage range, a second operation mode selected if the input voltage to the power converter is in a second input voltage range, and a third operation mode selected if an output current from the power converter is lower than a predetermined threshold current or if the on-time is lower than a predetermined threshold on-time.
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Abstract
A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes corresponding to different levels of input voltage or output current. The power converter comprises a power stage for delivering the electrical power from the power source to the load, a switch in the power stage that electrically couples or decouples the load to the power source, and a switch controller coupled to the switch for controlling the on-times and off-times of the switch according to the plurality of operation modes. Each of the operation modes correspond to associated ranges of at least one of an input voltage to the power converter and an output current from the power converter, where the associated ranges are different for each of the operation modes.
130 Citations
28 Claims
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1. A power converter comprising:
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a power stage for transferring electrical power from a power source to a load;
a switch in the power stage that electrically couples or decouples the load to or from the power source; and
a switch controller coupled to the switch for controlling on-times and off-times of the switch according to a plurality of operation modes, the operation modes including a first operation mode selected if an input voltage to the power converter is in a first input voltage range, a second operation mode selected if the input voltage to the power converter is in a second input voltage range, and a third operation mode selected if an output current from the power converter is lower than a predetermined threshold current or if the on-time is lower than a predetermined threshold on-time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A controller for controlling a power converter, the power converter including a power stage for transferring electrical power from a power source to a load and a switch in the power stage that electrically couples or decouples the load to or from the power source, wherein the controller is coupled to the switch for controlling on-times and off-times of the switch according to a plurality of operation modes, the operation modes including:
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a first operation mode selected if an input voltage to the power converter is in a first input voltage range;
a second operation mode selected if the input voltage to the power converter is in a second input voltage range; and
a third operation mode selected if an output current from the power converter is lower than a predetermined threshold current or if the on-time is lower than a predetermined threshold on-time - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of shaping input current to a power converter, the method comprising the steps of:
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the power converter selecting one of a plurality of operation modes for controlling on-times and off-times of a switch that electrically couples or decouples a load of the power converter to or from a power source, the operation modes including a first operation mode selected if an input voltage to the power converter is in a first input voltage range, a second operation mode selected if the input voltage to the power converter is in a second input voltage range, and a third operation mode selected if an output current from the power converter is lower than a predetermined threshold current or if the on-time is lower than a predetermined threshold on-time; and
the power converter synthesizing the input current in real time by controlling the on-times and the off-times of the switch based upon the selected operation mode and a reference waveform shape. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A power converter comprising:
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transferring means for transferring electrical power from a power source to a load;
switching means in the transferring means for electrically coupling or decoupling the load to or from the power source; and
controlling means coupled to the switching means for controlling on-times and off-times of the switching means according to a plurality of operation modes, the operation modes including a first operation mode selected if an input voltage to the power converter is in a first input voltage range, a second operation mode selected if the input voltage to the power converter is in a second input voltage range, and a third operation mode selected if an output current from the power converter is lower than a predetermined threshold current or if the on-time is lower than a predetermined threshold on-time.
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Specification