Controlled transient responses in four-switch buck boost power stages
AssigneeTexas Instruments Incorporated
InventorsGustavo Martinez, Han Zhang, Robert Sheehan, Manish Bhardwaj
Life of this patent
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Abstract
Four-switch buck boost power stages with reduced overshoot conditions at an output node are presented. Based on a detected condition for a decrease in a quantity of the active load elements, the method includes enabling an active discharge circuit coupled to an output node of a power stage before the quantity of the active load elements is decreased. Based on a detected condition for an increase in the quantity of the active load elements, the method includes activating the load elements and applying a restricted gain to the voltage conversion circuit.
Claims20
A method, comprising:
- obtaining a request for a change in a quantity of active load elements at an output node supplied by a voltage conversion circuit;
- based on the request indicating a decrease in the quantity of the active load elements, enabling an active discharge circuit coupled to the output node before the quantity of the active load elements is decreased;
- and
- based on the request indicating an increase in the quantity of the active load elements, activating the load elements, applying a linear gain increase to the voltage conversion circuit for a first amount of time, and applying a constant gain to the voltage conversion circuit for a second amount of time.
An apparatus, comprising:
- a power controller configurable to obtain a request for a change in a quantity of active load elements at an output node supplied by a voltage conversion circuit;
- and
- a transient control circuit configurable to:
- based on the request indicating a decrease in the quantity of the active load elements, enable an active discharge circuit coupled to the output node before the quantity of the active load elements is decreased;
- and
- based on the request indicating an increase in the quantity of the active load elements, activate the load elements, apply a linear gain increase for a first amount of time, and apply a constant gain for a second amount of time.
A system, comprising:
- a power controller configurable to provide control signals for a voltage conversion unit providing power to an output node;
- and
- an active discharge circuit coupled to the output node and comprising a selectable discharge connection to ground;
- wherein the power controller is configurable to:
- enable the active discharge circuit prior to a decrease in a quantity of activated load elements at the output node;
- and
- increase the quantity of the activated load elements at the output node;
- apply a linear gain increase to the voltage conversion unit for a first amount of time;
- and
- apply a constant gain to the voltage conversion unit for a second amount of time.
Dependencies are inferred from the claim text.