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US 9,071,134 B2Granted
Power supply controller having selectable PWM and RPM modes and method therefor
AssigneeSemiconductor Components Industries, LLC
InventorsPaul J. Harriman, Rong-Shyang Ou
Life of this patent
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Abstract
At least one exemplary embodiment is directed to a method of switching between synchronous and nonsynchronous ramp control. An embodiment may include a power supply controller that has a trigger circuit configured to generate an RPM trigger, a timer circuit configured to generate a clock signal, and a switching circuit configured to switch a modulation mode responsively to the clock signal and the RPM signal.
Claims20
A method of forming a converter for a power supply system having an output voltage comprising:
- configuring the converter to generate an error signal representative of the output voltage;
- configuring the converter to generate a threshold signal;
- configuring the converter to switch a modulation type from a first modulation mode to a second modulation mode responsively to the error signal passing the threshold signal at a given time, where the first modulation mode is one of an edge modulation mode that forms a PWM (Pulse Width Modulation) signal substantially synchronous with a clock signal or an RPM (Ramp Pulse Modulation) modulation mode that forms the PWM signal substantially non-synchronous with the clock signal, and where the second modulation mode is an other one of the edge modulation mode or the RPM modulation mode and where the edge modulation mode is one of a trailing edge modulation or a leading edge modulation mode.
A power supply controller comprising:
- a RPM (Ramp Pulse Modulation) modulator circuit, that controls a RPM modulation mode and wherein the RPM modulation mode is a first modulation mode;
- an Edge modulator circuit, that controls an edge modulation mode that includes forming a PWM (Pulse Width Modulation) signal substantially synchronously to a clock signal wherein the PWM signal has a variable duty cycle, wherein the Edge modulation mode is a second modulation mode;
- and
- a switching circuit, that switches a modulation mode from the second modulation mode to the first modulation mode responsively to an error signal substantially passing a threshold signal wherein the RPM modulation mode forms the PWM control signal substantially non-synchronous to the clock signal.
1 more element
A power supply controller comprising:
- a RPM (Ramp Pulse Modulation) trigger circuit, wherein the RPM trigger circuit generates an RPM trigger signal;
- a timer circuit, wherein the timer circuit generates a clock signal;
- and
- a switching circuit, wherein the switching circuit is configured to switch a modulation mode from a synchronous mode having a PWM (Pulse Width Modulation) signal that is formed substantially synchronous with the clock signal to a non-synchronous RPM modulation mode that forms the PWM signal substantially non-synchronously with the clock signal wherein the modulation mode switch occurs substantially responsively to a state of the clock signal and a state of the RPM trigger signal.
1 more element
Dependencies are inferred from the claim text.