Charging method, apparatus and system, charger, and chargeable device

Patent metadata

Field	Value
Publication number	US-2016190848-A1
Application number	US-201514868939-A
Country	US
Kind code	A1
Filing date	Sep 29, 2015
Priority date	Dec 31, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A charging method, a charging apparatus, a charger, a chargeable device and a charging system are provided. The charging method includes: acquiring a first current value of a control current from a chargeable device; acquiring a first voltage value corresponding to the acquired first current value of the control current based on a preset relation, wherein the preset relation represents correlations between current values and voltage values; and adjusting a voltage value of an output voltage of a charger to the acquired first voltage value corresponding to the first current value of the control current. Accordingly, capability of the charger can be fully used, and fast charging can be achieved.

First claim

What is claimed is:

1 . A charging method, comprising:
acquiring a first current value of a control current from a chargeable device; acquiring a first voltage value corresponding to the acquired first current value of the control current based on a preset relation, wherein the preset relation represents correlations between current values and voltage values; and adjusting a voltage value of an output voltage of a charger to the acquired first voltage value corresponding to the first current value of the control current.

2 . The charging method according to claim 1 , further comprising: receiving a detecting current sent from the chargeable device; and sending a feedback signal to the chargeable device when a time period of receiving the detecting current reaches a preset value, where the first current value of the control current is acquired from the chargeable device after the feedback signal is sent to the chargeable device.

3 . The charging method according to claim 1 , further comprising: after adjusting the voltage value of the output voltage of the charger to the first voltage value, resetting the voltage value of the output voltage of the charger into a default value when the acquired first current value of the control current becomes zero.

4 . The charging method according to claim 1 , wherein the preset relation comprises a linear relation or a non-linear relation.

5 . A charging apparatus, comprising:
a first acquiring unit configured to acquire a first current value of a control current from a chargeable device; a second acquiring unit configured to acquire a first voltage value corresponding to the acquired first current value of the control current based on a preset relation, wherein the preset relation represents correlations between current values and voltage values; and an adjusting unit configured to adjust a voltage value of an output voltage of a charger to the first voltage value corresponding to the first current value of the control current.

6 . The charging apparatus according to claim 5 , further comprising a detecting unit, wherein the detecting unit is configured to: receive a detecting current from the chargeable device; and send a feedback signal to the chargeable device when a time period of receiving the detecting current reaches a preset value.

7 . The charging apparatus according to claim 5 , further comprising a resetting unit, wherein the resetting unit is configured to: reset the value of the output voltage of the charger into a default value when the acquired first current value of the control current becomes zero.

8 . A charger, comprising: a detecting circuit, a feedback circuit and a voltage converter;
wherein the detecting circuit comprises a comparing unit and a resistor; wherein the resistor has a first end coupled with a current input terminal of the charger, and a second end coupled with ground; wherein the comparing unit comprises at least four comparators which have different threshold values, first input terminals of the at least four comparators are all input with a voltage drop of the resistor, second input terminals of the at least four comparators are respectively input with the threshold values thereof, and output terminals of the at least four comparators are all coupled with the feedback circuit; wherein the feedback circuit is disposed between the detecting circuit and the voltage converter, and is configured to: convert comparison results output from the at least four comparators into control signals, and send the control signals to the voltage converter; and wherein the voltage converter is coupled with the feedback circuit, and is configured to adjust an output voltage of the charger based on the control signals.

9 . The charger according to claim 8 , wherein the detecting circuit further comprises a logic controller and a switching unit;
wherein the logic controller is coupled with the output terminals of the comparators, and is configured to: receive the comparison results from the comparators, start recording time if the threshold values of at least two of the comparators are less than a value of the voltage drop of the resistor, and switch on the switching unit when the recorded time reaches a preset value; and wherein the switching unit is coupled with the logic controller, and is configured to reduce a resistance of the resistor when being switched on.

10 . The charger according to claim 9 , wherein the switching unit comprises any one of: a NMOS transistor, a PMOS transistor, a triode, and an electric relay.

11 . The charger according to claim 9 , wherein the switching unit comprises a NMOS transistor, the resistor comprises a first resistor and a second resistor;
wherein the first resistor has a first end coupled with the first input terminals of the at least four comparators, and a second end coupled with a drain of the NMOS transistor; wherein the second resistor has a first end coupled with the drain of the NMOS transistor, and a second end coupled with ground; and wherein the NMOS transistor has a gate coupled with the logic controller, and a source coupled with ground.

12 . The charger according to claim 9 , wherein the switching unit comprises a NMOS transistor, the resistor comprises a first resistor and a second resistor;
wherein the first resistor has a first end coupled with a source of the NMOS transistor, and a second end coupled with ground; wherein the second resistor has a first end coupled with a drain of the NMOS transistor and the first input terminals of the at least four comparators, and a second end coupled with the source of the NMOS transistor; and wherein the NMOS transistor has a gate coupled with the logic controller.

13 . The charger according to claim 9 , wherein the switching unit comprises a NMOS transistor, the resistor comprises a first resistor and a second resistor;
wherein the first resistor has a first end coupled with the first input terminals of the at least four comparators, and a second end coupled with a drain of the NMOS transistor; wherein the second resistor has a first end coupled with the first end of the first drawdown resistor, and a second end coupled with a source of the NMOS transistor; and wherein a gate of the NMOS transistor is coupled with the logic controller, and the source of the NMOS transistor is coupled with ground.

14 . The charger according to claim 9 , wherein the switching unit comprises a NMOS transistor, the resistor comprises a first resistor and a second resistor;
wherein the first resistor has a first end coupled with a source of the NMOS transistor, and a second end coupled with ground; wherein the second resistor has a first end coupled with a drain of the NMOS transistor, and a second end coupled with ground; and wherein a gate of the NMOS transistor is coupled with the logic controller, the drain of the NMOS transistor is coupled with the first input terminals of the at least four comparators.

15 . The charger according to claim 8 , wherein the voltage converter comprises an AC-DC converter, or a DC-DC converter.

16 . The charger according to claim 8 , wherein the voltage converter comprises an AC-DC converter, and the feedback circuit comprises an isolator which is configured to physically isolate the AC-DC converter and the detecting circuit.

17 . The charger according to claim 16 , wherein the isolator comprises a light coupling device.

18 . A chargeable device, comprising a variable current source and a controller;
wherein the controller is configured

Assignees

• Spreadtrum Comm Shanghai Co

Inventors

• Chen Liangjin

Classifications

• H02J7/933 Primary

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/0077 Primary

  Electricity · mapped topic

• H02J7/0052

  Electricity · mapped topic

• H02J7/00 Primary

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title