Dead-time compensation in a power supply system
AssigneeTexas Instruments Incorporated
InventorAdam L. Shook
Life of this patent
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Abstract
One embodiment includes a power supply system. The system includes a pulse-width modulation (PWM) system configured to generate a PWM signal. The system also includes a power stage comprising a gate driver, a high-side switch, and a low-side switch. The gate driver can be configured to alternately activate the high-side and low-side switches to provide an output signal to a load in response to the PWM signal, and to provide an activation dead-time between the alternate activation of the high-side and low-side switches. The system further includes a digital delay system configured to measure the activation dead-time and to add the measured activation dead-time to the activation of the high-side switch.
Claims20
A method, comprising:
- generating a pulse-width modulation (PWM) signal including a first PWM pulse during a first time period and a second PWM pulse during a second time period after the first time period, the first PWM pulse having a first PWM pulse width, the second PWM pulse having a second PWM pulse width;
- generating an activation signal corresponding to the first PWM pulse during the first time period;
- generating an output signal based on the activation signal;
- measuring an activation dead-time by comparing the first PWM pulse with the output signal during the first time period;
- generating a control signal having an adjusted pulse width based on the second PWM pulse width and the measured activation dead-time;
- and
- prolonging the activation signal during the second time period based on the control signal.
A method, comprising:
- generating a pulse-width modulation (PWM) signal including a first PWM pulse during a first time period and a second PWM pulse during a second time period after the first time period, the first PWM pulse having a first PWM pulse width, the second PWM pulse having a second PWM pulse width;
- measuring an activation dead-time between the first PWM pulse and an output signal during the first time period;
- and
- generating a control signal having an adjusted pulse width extending from the second PWM pulse width by the measured activation dead-time, the control signal prolonging an activation signal for switching the output signal during the second time period.
A power supply system, comprising:
- means for generating a pulse-width modulation (PWM) signal including a first PWM pulse during a first time period and a second PWM pulse during a second time period after the first time period, the first PWM pulse having a first PWM pulse width, the second PWM pulse having a second PWM pulse width;
- means for measuring an activation dead-time between the first PWM pulse and an output signal during the first time period;
- and
- means for generating a control signal having an adjusted pulse width extending from the second PWM pulse width by the measured activation dead-time, the control signal prolonging an activation signal for switching the output signal during the second time period.
Dependencies are inferred from the claim text.