Peak charging current modulation for burst mode conversion
First Claim
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1. A method of controlling a voltage converter having multiple switches and an inductive element coupled to the switches and charged with charging current until a peak current charging level is reached, the method comprising the steps of:
- comparing the peak current charging level with a preset peak charging current threshold level to control switching of the switches, detecting an input voltage and an output voltage of the converter; and
modulating the preset peak charging current threshold level in accordance with a difference between the input voltage and the output voltage.
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Abstract
During burst mode operation of a four switch buck-boost converter, the input voltage and an output voltage can be detected and a preset peak charging current threshold level can be modulated when the difference between the input voltage and output voltage is within a prescribed range. A burst mode charging cycle will progress until the modulated peak charging threshold level is attained and cut off at the set peak level. A charge transfer cycle and discharge cycle may proceed thereafter.
21 Citations
16 Claims
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1. A method of controlling a voltage converter having multiple switches and an inductive element coupled to the switches and charged with charging current until a peak current charging level is reached, the method comprising the steps of:
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comparing the peak current charging level with a preset peak charging current threshold level to control switching of the switches, detecting an input voltage and an output voltage of the converter; and modulating the preset peak charging current threshold level in accordance with a difference between the input voltage and the output voltage. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14)
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7. A voltage converter comprising:
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an input node and an output node; an inductor charged with current until a peak level of inductor current is reached; multiple controllable switches coupled to the inductor; a controller having an output for controlling the switches; a reference level setting circuit coupled to the input and output nodes to produce a variable reference level defining the peak level of the inductor current, the reference level being variable in accordance with a difference between input voltage at the input node and output voltage at the output node; and a comparator responsive to the inductor current and the reference level at an output of the reference level setting circuit to produce an output signal supplied to the controller to control switching of the switches when the inductor current reaches the peak level. - View Dependent Claims (8, 9, 10, 11, 12, 15, 16)
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Specification