Back to results
US 10,707,760 B2Granted
Asynchronous controller for low power hysteretic buck-boost DC-DC controller
AssigneeRenesas Electronics America Inc.
InventorGwilym Francis Luff
Life of this patent
Estimating the term…
Abstract
The present embodiments relate generally to power controllers, and more particularly to synthetic current hysteretic control of a buck-boost DC-DC controller. In one or more embodiments, an asynchronous controller of a buck-boost converter implements a state diagram for controlling PFM-PWM and Buck-Boost transitions with minimal circuitry and power consumption.
Claims9
A buck-boost controller, comprising:
- a state machine that implements a state diagram for controlling transitions between a buck mode and a boost mode of operation of the buck-boost controller based on window crossing signals from a window comparator, wherein the state diagram comprises a buck on state, a buck off state, a boost on state and a boost off state;
- a multiplexer for selectively sending control signals to switching transistors of the buck-boost controller based on an output of the state machine;
- and
- an auto-bypass timer and wherein the state diagram further includes a buck bypass state and a boost bypass state, and wherein the state machine is configured to transition the buck-boost controller between the buck mode and the boost mode of operation when the state machine is in either the buck bypass state or the boost bypass state and based on an output of the auto-bypass timer.
1 more element
A buck-boost controller comprising:
- a state machine that implements a state diagram for controlling transitions between a buck mode and a boost mode of operation of the buck-boost controller based on window crossing signals from a window comparator;
- a multiplexer for selectively sending control signals to switching transistors of the buck-boost controller based on an output of the state machine,
- wherein the state diagram comprises a buck on state, a buck off state, a boost on state and a boost off state, and
- wherein the state machine further receives a zero-crossing signal from the switching transistors, the state diagram further including a buck tristate state and a boost tristate state;
- and
- an audio band suppression (ABS) timer, and wherein the state machine is further configured to transition out of either the buck tristate state or the boost tristate state based on an output of the ABS timer.
3 more elements
A buck-boost controller, comprising:
- a state machine that implements a state diagram for controlling transitions between a buck mode and a boost mode of operation of the buck-boost controller based on window crossing signals from a window comparator;
- a multiplexer for selectively sending control signals to switching transistors of the buck-boost controller based on an output of the state machine,
- wherein the state diagram comprises a buck on state, a buck off state, a boost on state and a boost off state, and
- wherein the state machine further receives a zero-crossing signal from the switching transistors, the state diagram further including a buck tristate state and a boost tristate state, and
- wherein the window crossing signals are generated based on a comparison of a compensation signal with upper and lower window voltages, and wherein the window crossing signals include an upper window crossing signal that indicates when the compensation signal exceeds the upper window voltage, and wherein the window crossing signals further include a lower window crossing signal that indicates when the compensation signal drops below the lower window voltage, and
- wherein the compensation signal is based on a ripple signal representing a current output by the buck-boost controller.
3 more elements
Dependencies are inferred from the claim text.