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US 2018/0019674 A1Published application
Dc-dc converter having digital control and reference pwm generators
AssigneeEndura Technologies LLC
InventorHassan Ihs
Life of this patent
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Abstract
A DC-DC converter operating in pulse frequency modulation (PFM) and pulse width modulation (PWM) modes includes a plurality of PWM signal generators. The PWM signal generators generate PWM signals with different duty cycles. PWM signals with larger duty cycles may be selected for use in undervoltage situations.
Claims8
-11. (canceled)
A method of controlling a switching DC-DC converter, comprising:
- generating a first pulse width modulation (PWM) signal having a first duty cycle;
- generating a second PWM signal having a second duty cycle, the second duty cycle having a different duration than the first duty cycle;
- determining that an output voltage of the DC-DC converter is below a first predefined voltage level;
- in response to determining that the output voltage of the DC-DC converter is below the first predefined voltage level, controlling operation of at least some switches of the switching DC-DC converter based on the first PWM signal;
- determining that the output voltage of the DC-DC converter is above the first predefined voltage level;
- in response to determining that the output voltage of the DC-DC converter is above the first predefined voltage level, controlling operation of the at least some switches of the switching DC-DC converter based on the second PWM signal.
3 more elements
A digitally controlled DC-DC converter, comprising:
- a high side switch and a low side switch coupled in series, with a first end of an output inductor coupled to a node between the high side switch and the low side switch and a second end of the output inductor providing a regulated output for a load, with an output capacitor coupled to the second end of the output inductor;
- a plurality of pulse width modulation (PWM) signal generators each configured to generate a PWM signal having a duty cycle of a different duration;
- and
- circuitry to select a one of the PWM signals for use in controlling the high side switch and the low side switch based on a measure of the regulated output.
1 more element
Dependencies are inferred from the claim text.