Switching Power Converter with Efficient Switching Control Signal Period Generation
First Claim
1. A system comprising:
- a controller to generate a switch control signal to control conductivity of a switch included in a switching power converter, wherein controlling conductivity of the switch causes an input current to the switching power converter to vary in approximate proportion to a time varying voltage source signal supplied to the switching power converter, wherein the controller comprises;
a period generator to determine a period of the switch control signal so that the period of the switch control signal varies in accordance with at least one of;
(i) the period of the switch control signal trends inversely to estimated power delivered to a load coupled to the switching power converter;
(ii) the period of the switch control signal trends inversely to instantaneous voltage levels of the time-varying voltage source signal; and
(iii) the period of the switch control signal trends directly with a line voltage level of the time-varying voltage source signal; and
a pulse width generator to determine a pulse width of the switch control signal in response to at least one of;
(i) the determined period of the switch control signal, (ii) the instantaneous voltage levels of the voltage source signal, and (iii) a voltage level of the output voltage signal of the switching power converter.
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Accused Products
Abstract
A power control system includes a switching power converter and a controller, and the controller responds to a time-varying voltage source signal by generating a switch control signal having a period that varies in accordance with at least one of the following: (i) the period of the switch control signal trends inversely to estimated power delivered to a load coupled to the switching power converter, (ii) the period of the switch control signal trends inversely to instantaneous voltage levels of the voltage source signal, and (iii) the period of the switch control signal trends directly with a line voltage level of the time-varying voltage source signal. In at least one embodiment, the controller achieves an efficient correlation between the switching period with associated switching losses and the instantaneous power transferred to the switching power converter while providing power factor correction (PFC).
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Citations
26 Claims
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1. A system comprising:
a controller to generate a switch control signal to control conductivity of a switch included in a switching power converter, wherein controlling conductivity of the switch causes an input current to the switching power converter to vary in approximate proportion to a time varying voltage source signal supplied to the switching power converter, wherein the controller comprises; a period generator to determine a period of the switch control signal so that the period of the switch control signal varies in accordance with at least one of; (i) the period of the switch control signal trends inversely to estimated power delivered to a load coupled to the switching power converter; (ii) the period of the switch control signal trends inversely to instantaneous voltage levels of the time-varying voltage source signal; and (iii) the period of the switch control signal trends directly with a line voltage level of the time-varying voltage source signal; and a pulse width generator to determine a pulse width of the switch control signal in response to at least one of;
(i) the determined period of the switch control signal, (ii) the instantaneous voltage levels of the voltage source signal, and (iii) a voltage level of the output voltage signal of the switching power converter.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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generating a switch control signal to control conductivity of a switch included in a switching power converter, wherein controlling conductivity of the switch causes an input current to the switching power converter to vary in approximate proportion to a time varying voltage source signal supplied to the switching power converter; determining a period of the switch control signal so that the period of the switch control signal varies in accordance with at least one of; (i) the period of the switch control signal trends inversely to estimated power delivered to a load coupled to the switching power converter; (ii) the period of the switch control signal trends inversely to instantaneous voltage levels of the voltage source signal; and (iii) the period of the switch control signal trends directly with a line voltage level of the time-varying voltage source signal; determining a pulse width of the switch control signal in response to at least one of;
(i) the determined period of the switch control signal, (ii) the instantaneous voltage levels of the voltage source signal, and (iii) a voltage level of the output voltage signal of the switching power converter; andproviding the switch control signal to the switching power converter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An apparatus comprising:
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means for generating a switch control signal to control conductivity of a switch included in a switching power converter, wherein controlling conductivity of the switch causes an input current to the switching power converter to vary in approximate proportion to a time varying voltage source signal supplied to the switching power converter; means for determining a period of the switch control signal so that the period of the switch control signal varies in accordance with at least one of; (i) the period of the switch control signal trends inversely to instantaneous power transferred to the switching power converter; (ii) the period of the switch control signal trends inversely to voltage level changes of the voltage source signal; and (iii) the period of the switch control signal trends directly with a line voltage level of the time-varying voltage source signal; and means for determining a pulse width of the switch control signal in response to at least one of;
(i) the determined period of the switch control signal, (ii) a voltage level of the voltage source signal, and (iii) a voltage level of the output voltage signal of the switching power converter.
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Specification