Portable dual-device charger system

Patent metadata

Field	Value
Publication number	US-11075527-B2
Application number	US-201916573483-A
Country	US
Kind code	B2
Filing date	Sep 17, 2019
Priority date	Sep 19, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A portable charger system provides two charger ports with different charging characteristics. Two devices having different charging characteristics may be coupled to the two charger ports to be charged simultaneously.

First claim

The invention claimed is:

1. A portable charger system for charging a first device and a second device, the portable charger system comprising:
a first charger port to provide an electrical connection with a first device;
a second charger port to provide an electrical connection with a second device;
a constant voltage source having an output coupled to the first charger port;
a constant current source having an output coupled to the second charger port;
a rechargeable battery that is separate from at least the constant voltage source;
a connector having a connector input node to receive input power from an external source and a connector output node, wherein the connector is separate from the first charger port and the second charger port; and
a battery charger having a battery charger input node coupled to the connector output node, a battery charger output node coupled to the constant voltage source and the constant current source, and a battery node coupled to the rechargeable battery, the battery charger having a power path management control circuit that forms:
a first device charging path between the battery charger input node and the battery charger output node when a voltage on the battery charger input node is above a select voltage threshold;
a battery charging path between the battery charger input node and the battery node when the voltage on the battery charger input node is above the select voltage threshold; and
a second device charging path between the battery node and the battery charger output node when the voltage at the battery charger input node is at or below the select voltage threshold.

2. The portable charger system of claim 1 , wherein the connector is a Universal Serial Bus (USB) connector.

3. The portable charger system of claim 2 , further comprising a common mode filter in an electrical path between the connector output node and the battery charger input node, the common mode filter having characteristics to remove electromagnetic interference from one or more USB data lines.

4. The portable charger system of claim 3 , wherein the common mode filter further has characteristics to suppress electrostatic discharge in the electrical path.

5. A portable charger system for charging a first device and a second device, the portable charger system comprising:
a first charger port to provide an electrical connection with a first device;
a second charger port to provide an electrical connection with a second device;
a constant voltage source having an output coupled to the first charger port;
a constant current source having an output coupled to the second charger port;
a rechargeable battery;
a connector having a connector input node to receive input power from an external source and a connector output node, wherein the connector is a Universal Serial Bus (USB) connector;
a battery charger having a battery charger input node coupled to the connector output node, a battery charger output node coupled to the constant voltage source and the constant current source, and a battery node coupled to the rechargeable battery, the battery charger having a power path management control circuit that forms:
a first device charging path between the battery charger input node and the battery charger output node when a voltage on the battery charger input node is above a select voltage threshold;
a battery charging path between the battery charger input node and the battery node when the voltage on the battery charger input node is above the select voltage threshold; and
a second device charging path between the battery node and the battery charger output node when the voltage at the battery charger input node is at or below the select voltage threshold;

a common mode filter in an electrical path between the connector output node and the battery charger input node, the common mode filter having characteristics to remove electromagnetic interference from one or more USB data lines; and
a processor coupled to a node of the common mode filter to receive a ship mode detection signal and coupled to the battery charger to activate the battery charger in response to receiving the ship mode detection signal.

6. The portable charger system of claim 1 , wherein the constant voltage source is a DC-DC converter.

7. The portable charger system of claim 1 , wherein the constant voltage source outputs a voltage of approximately +5 V.

8. The portable charger system of claim 1 , further comprising an overcurrent protection at an output of the constant voltage source.

9. The portable charger system of claim 8 , further comprising a processor coupled to the overcurrent protection to provide an enable control signal to the overcurrent protection.

10. The portable charger system of claim 1 , wherein an input of the constant current source is coupled to the output of the constant voltage source.

11. The portable charger system of claim 10 , further comprising a switch at the input of the constant current source to enable or disable power supply from the constant voltage source to the constant current source.

12. The portable charger system of claim 11 , wherein the switch is a high side switch comprising a P-channel MOSFET coupled to an N-channel MOSFET.

13. The portable charger system of claim 11 , further comprising a temperature limit comparator circuit comprising a temperature limit comparator having a first input node coupled to a thermistor circuit that provides a thermistor signal, a second input node coupled to a temperature limit threshold circuit that provides a temperature limit threshold signal, and an output node to output a temperature limit comparator signal representative of a comparison between the thermistor signal and the temperature limit threshold signal, wherein the output node is coupled to the switch to provide an enable port of the switch with the temperature limit comparator signal.

14. The portable charger system of claim 13 , further comprising a processor coupled to the output node of the temperature limit comparator, the processor to detect the temperature limit comparator signal and selectively adjust the temperature limit comparator signal.

15. The portable charger system of claim 13 , wherein the thermistor circuit comprises a thermistor to sense a temperature in the system.

16. The portable charger system of claim 15 , further comprising a printed circuit board carrying at least the constant voltage source, the constant current source, and the battery charger, wherein the thermistor senses a temperature of the printed circuit board.

17. A portable charger system for charging a first device and a second device, the portable charger system comprising:
a first charger port to provide an electrical connection with a first device;
a second charger port to provide an electrical connection with a second device;
a constant voltage source having an output coupled to the first charger port;
a constant current source having an output coupled to the second charger port;
a rechargeable battery;
a connector having a connector input node to receive input power from an external source and a connector output node;
a battery charger having a battery charger input node coupled to the connector output node, a battery charger output node coupled to the constant voltage source and the constant current source, and a battery node coupled to the rechargeable battery, the battery charger having a power path management control circuit that forms:
a first device charging path between the battery charger input node and the battery charger output node when a

Assignees

• Google Llc

Inventors

• Isaacs Philip Michael
• Xu Kai
• Vandervies David

Classifications

• H02J7/62

  against overcurrent · CPC title

• H02J7/825

  Detection of fully charged condition · CPC title

• H02J7/92

  with prioritisation of loads or sources · CPC title

• H02J7/65

  against overtemperature · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title