DC-DC converters with loop control
AssigneeTexas Instruments Incorporated
InventorsJiancong Ruan, Runqin Tan, Peisheng Zhu
Life of this patent
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Abstract
A converter system (100) includes a switch (102) adapted to be coupled to a switching terminal (104). The switch (102) is configured to generate a switching signal having first and second states at the switching terminal (104). Ripple generating circuitry (122) is adapted to be coupled to the switching terminal (104) and is configured to: generate a filtered signal based on the switching signal; and keep the filtered signal within a particular range. Loop control circuitry (116) is coupled to the ripple generating circuitry (122) and is configured to control the switch (102) based on the filtered signal.
Claims18
A converter system, comprising:
- a switch coupled to a switching terminal, the switch configured to generate a switching signal at the switching terminal, wherein the switching signal has first and second states;
- ripple generating circuitry coupled to the switching terminal, and including:
- an adjustable voltage divider coupled to the switching terminal, wherein the adjustable voltage divider is configured to provide an adjusted switching signal responsive to the switching signal and a voltage division ratio of the adjustable voltage divider;
- a ripple signal generator coupled to the adjustable voltage divider, and configured to provide a first-order filtered signal and a second-order filtered signal responsive to the adjusted switching signal;
- and
- resistance control circuitry having an input coupled to the ripple signal generator and an output coupled to the adjustable voltage divider, wherein the resistance control circuitry is configured to provide a resistance control signal to adjust the voltage division ratio responsive to the second-order filtered signal and a reference voltage;
- and
- a loop control circuit coupled to the ripple generating circuitry, and configured to control the switch responsive to the second-order filtered signal.
A controller for a converter system, comprising:
- ripple generating circuitry coupled to a switch of the converter system at a switching terminal having a switching signal, and including:
- an adjustable voltage divider coupled to the switching terminal, the adjustable voltage divider configured to provide an adjusted switching signal responsive to the switching signal and a voltage division ratio of the adjustable voltage divider;
- a ripple signal generator coupled to the adjustable voltage divider, and configured to provide a first-order filtered signal and a second-order filtered signal responsive to the adjusted switching signal;
- and
- resistance control circuitry having a resistance input and a resistance output, wherein the resistance input is coupled to the ripple signal generator, and the resistance output is coupled to the adjustable voltage divider, the resistance control circuitry configured to provide a resistance control signal at the resistance output to adjust the voltage division ratio responsive to the second-order filtered signal and a reference voltage;
- wherein the ripple generating circuitry is configured to:
- generate a filtered signal responsive to a switching signal at the switching terminal;
- and
- keep the filtered signal within a particular range;
- and
- loop control circuitry coupled to the ripple generating circuitry and to the switch, and configured to control the switch responsive to the filtered signal.
The controller of claim10, wherein the second resistive circuitry includes resistors coupled in series between the switching terminal and the voltage supply terminal, in which each resistor is coupled in parallel with a respective switch, and the respective switch is configured to open or close responsive to the count value, so that a resistance of the second resistive circuitry is proportional to the count value.
A converter system, comprising:
- a switch coupled to a switching terminal, wherein the switch is configured to generate a switching signal having first and second states at the switching terminal;
- ripple generating circuitry that includes:
- an adjustable voltage divider coupled to the switching terminal, wherein the adjustable voltage divider is configured to provide an adjusted switching signal responsive to:
- the switching signal;
- and
- a voltage division ratio of the adjustable voltage divider;
- a ripple signal generator coupled to the adjustable voltage divider, and configured to provide a filtered signal based on the adjusted switching signal;
- and
- resistance control circuitry having an input coupled to the ripple signal generator and an output coupled to the adjustable voltage divider, wherein the resistance control circuitry is configured to provide a resistance control signal for adjusting the voltage division ratio responsive to the filtered signal and a reference voltage.
Dependencies are inferred from the claim text.