Switching Power Converter With Efficient Switching Control Signal Period Generation

• US 20110103111A1
• Filed: 01/07/2011
• Published: 05/05/2011
• Est. Priority Date: 05/02/2007
• Status: Abandoned Application

• Current Assignee: John L. Melanson
• Original Assignee: John L. Melanson
• Inventors: Melanson, John L.
• Application Number:
  US12/986,761
• Publication Number:
  US 20110103111A1
• Time in Patent Office: Days
• US Class Current: 363/79
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H03M 3/476 Non-linear conversion systems
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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).

Claims

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.

2-26. -26. (canceled)