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US 10,541,609 B2Granted
Fixed frequency DC-DC converter
AssigneeTexas Instruments Incorporated
InventorsJiwei Fan, Mingyue Zhao, Huy Le Nhat Nguyen
Life of this patent
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Abstract
In a power converter system, circuitry generates first and second PWM signals during a PWM cycle for controlling application of power to an inductor. Circuitry generates error signals having AC- and DC-components, the error signals being generated in response to indications of the power applied to or developed by the inductor. Circuitry generates a feedback control signal in response to the error signals. The first and second PWM signals are controlled in response to the feedback control signals.
Claims20
A circuit, comprising:
- a pulse width modulation (PWM) logic circuit configured to generate a first PWM signal associated with a power switch, the first PWM signal having a first pulse, and a second PWM signal having a second pulse corresponding to and partially overlapping in time with the first pulse, the second pulse having an earlier rising edge and a longer duty cycle than the first pulse of the first PWM signal;
- a loop circuit coupled to the PWM logic circuit, and configured to generate a ramp signal based on the second PWM signal;
- and
- a comparator circuit coupled to the loop circuit, and configured to generate a feedback control signal based on the ramp signal, the feedback control signal received by the PWM logic circuit to control a pulse width of the first PWM signal.
1 more element
A circuit, comprising:
- a pulse width modulation (PWM) logic circuit having:
- a loop comparator input terminal;
- a latch coupled to the loop comparator input terminal;
- a first PWM output terminal;
- a delay element coupled between the latch and the first PWM output terminal;
- and
- a second PWM output terminal coupled to the latch;
- a loop circuit having a loop input coupled to the second PWM output terminal, and a loop output;
- and
- a comparator circuit having a comparator input coupled to the loop output, and a comparator output coupled to the loop comparator input terminal of the PWM logic circuit.
7 more elements
A circuit, comprising:
- a pulse width modulation (PWM) logic circuit configured to generate a first PWM signal associated with a power switch, and a second PWM signal having an earlier rising edge than the first PWM signal;
- a ramp circuit coupled to the PWM logic circuit, and configured to generate a ramp signal based on the second PWM signal;
- a slope compensation circuit coupled to the PWM logic circuit, and configured to generate a slope signal based on the second PWM signal;
- and
- a comparator circuit coupled to the ramp circuit and the slope compensation circuit, and configured to generate a feedback control signal based on the ramp signal and the slope signal, the feedback control signal received by the PWM logic circuit to control a pulse width of the first PWM signal.
2 more elements
Dependencies are inferred from the claim text.