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Adaptive switching frequency adjustment for a power supply

  • US 10,404,165 B2
  • Filed: 04/30/2013
  • Issued: 09/03/2019
  • Est. Priority Date: 01/29/2013
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a controller that generates a switching frequency for a switch included in a power supply, wherein the controller varies the switching frequency as a function of an input voltage and an output voltage such that an inductor ripple current is kept substantially constant,wherein the switching frequency has a first frequency value based on the input voltage having a first voltage value to achieve a defined duty cycle, wherein the switching frequency has a second frequency value based on the input voltage having a second voltage value,wherein the first frequency value is less than the second frequency value and wherein the first voltage value is less than the second voltage, and wherein an output terminal of the switch is directly connected to a positive, non-inverting terminal of a comparator, and an output terminal of the comparator is electrically coupled to an input terminal of a pulse width modulator that generates a pulse width for a pulse width modulation signal,wherein the comparator outputs an adaptive on-time signal that is received by the pulse width modulator, and wherein the output of the pulse width modulator is directly connected to the switch, wherein an input node of the controller is coupled to a resistor and a second resistor, wherein the resistor and the second resistor are coupled to one another at a second terminal, andwherein the second terminal is directly coupled to a positive, non-inverting terminal of an amplifier, and wherein the negative terminal of the amplifier is directly connected to a first MOSFET and the first MOSFET is coupled between a second MOSFET and a third MOSFET, and wherein the third MOSFET is coupled to a first capacitor that is directly connected to the switch, the switch being distinct from a MOSFET and the switch being distinct from a flip flop; and

    a filter that provides the output voltage to a load based at least in part on the pulse width modulation signal, wherein variation of the switching frequency facilitates minimization of active components and passive components in the filter.

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