Configurable charge controller

• US 10,185,342 B2
• Filed: 09/13/2017
• Issued: 01/22/2019
• Est. Priority Date: 11/04/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Melgar, Aaron, Sporck, Christian, Song, Chunping, Wong, David, Hoque, Rashed, Horovitz, Neal, Oporta, Hector Ivan, Bergstrom, Daryl
• Primary Examiner(s): Nguyen, Matthew
• Application Number:
  US15/703,825
• Publication Number:
  US 20180129234A1
• Time in Patent Office: 496 Days
• CPC Class Codes: G05F 1/563 including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
• CPC Class Codes: G05F 1/575 characterised by the feedback circuit
• CPC Class Codes: H02M 1/0045 Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 2001/0045 Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear preregulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
• CPC Class Codes: H02M 2001/007 Plural converter units in cascade push-pull dc/dc converters with preregulator H02M3/3374; dc-ac converters following a dc-dc stage which includes a high frequency transformer H02M7/4807, dc-ac converters following a dc-dc conversion stage which generates a periodically varying voltage H02M7/4826
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: H02M 3/1588 comprising at least one synchronous rectifier element H02M3/1582, H02M3/1584 take precedence
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence

Abstract

A configurable charge converter may include an adaptive low-dropout regulator. The adaptive low-dropout regulator may include a headroom detection circuit and a power supply controller. The headroom detection circuit may monitor a voltage drop across a field effect transistor (FET) and cause a programmable power supply to increase or decrease an output voltage accordingly. In some aspects, the configurable charge converter may include an adaptive low-dropout regulator and a buck/boost converter. The output power of the configurable charge controller may be provided by the adaptive low-dropout regulator, the buck/boost converter, or by both the adaptive low-dropout regulator and the buck/boost converter operating in combination.

Claims

1. A power regulator comprising:

an adaptive low-dropout regulator configured to receive a variable output voltage, linearly regulate the variable output voltage to generate a first output voltage through a first output terminal in a first operating mode, and pass through the variable output voltage to the first output terminal in a second and a third operating mode;

a buck/boost converter configured to receive the first output voltage and generate a second output voltage through a second output terminal;

a controller configured to control the adaptive low-dropout regulator and the buck/boost converter based at least in part on the variable output voltage; and

a regulator output terminal coupled to the second output terminal and configured to provide an output voltage of the power regulator.

2. The power regulator of claim 1, further comprising:

a controller configured to;

determine a target output voltage of the power regulator; and

control the adaptive low-dropout regulator and the buck/boost converter based at least in part on the variable output voltage and the target output voltage.

3. The power regulator of claim 2, wherein the controller is further configured to determine the operating mode of the power regulator based at least in part on the variable output voltage, the target output voltage, and an input current.

4. The power regulator of claim 3, wherein the buck/boost converter is configured to step-up the first output voltage in the second operating mode and step-down the first output voltage in the third operating mode.

5. The power regulator of claim 1, wherein the controller is configured to control a power supply configured to provide the variable output voltage.

6. An adaptive low-dropout regulator comprising:

a field effect transistor (FET) configured to receive an output voltage from a variable output power supply;

a headroom detection circuit coupled to the FET and configured to measure a voltage difference between source and drain terminals of the FET; and

a power supply controller coupled to the headroom detection circuit and configured to adjust the variable output power supply based at least in part on the measured voltage difference, comprising;

a first output configured to provide a first signal to increase the output voltage of the variable output power supply, and

a second output configured to provide a second signal to decrease the output voltage of the variable output power supply, wherein the first output is separate from the second output.

7. The adaptive low-dropout regulator of claim 6, wherein the power supply controller is further configured to maintain a first voltage difference between the source and drain terminals of the FET by controlling the output voltage of the variable output power supply.

8. The adaptive low-dropout regulator of claim 6, wherein the FET is configured to operate in a linear mode based at least in part on the output voltage from the variable output power supply.

9. The adaptive low-dropout regulator of claim 6, wherein the FET is configured to provide a system voltage for a system load.

10. The adaptive low-dropout regulator of claim 9, wherein the power supply controller is configured to adjust the variable output power supply to maintain the measured voltage difference between the output voltage of the variable output power supply and the system voltage.

11. The adaptive low-dropout regulator of claim 6 further comprising a FET controller coupled to the FET and configured to control a gate voltage based at least in part on a detected current or detected voltage.

12. A power regulator comprising:

an adaptive low-dropout regulator configured to receive a first intermediate voltage and generate a first output voltage through a first output terminal;

a buck/boost converter configured to receive the first intermediate voltage and generate a second output voltage through a second output terminal coupled to the first output terminal;

a power regulator output terminal configured to receive the first output voltage from the first output terminal and the second output voltage from the second output terminal;

a controller configured to control the adaptive low-dropout regulator and the buck/boost converter based at least in part on a variable input voltage of the power regulator; and

a first field effect transistor (FET) configured to receive the variable input voltage and generate the first intermediate voltage for the adaptive low-dropout regulator and the buck/boost converter.

13. The power regulator of claim 12, further comprising:

a FET controller configured to operate the first FET as a linear regulator.

14. The power regulator of claim 12, wherein the controller is configured to:

determine a target output voltage of the power regulator;

determine an operating mode of the power regulator based at least in part on the variable input voltage and the target output voltage of the power regulator; and

control the adaptive low-dropout regulator and the buck/boost converter based at least in part on the operating mode of the power regulator.

15. The power regulator of claim 14, wherein the controller is configured to:

enable the adaptive low-dropout regulator and disable the buck/boost converter if the operating mode of the power regulator is a first operating mode; and

disable the adaptive low-dropout regulator and enable the buck/boost converter if the operating mode of the power regulator is a second operating mode.

16. The power regulator of claim 12, wherein the adaptive low-dropout regulator comprises:

a second FET configured to receive the first intermediate voltage, and generate the first output voltage.

17. The power regulator or claim 16, wherein the second FET is configured to operate in a linear mode.