Charging control apparatus and charging control method for use in mobile devices and charging system

A charging control method, which is configured to operably provide a supply power to a first mobile device and a second mobile device, wherein each of the first and the second mobile device includes:

• a mobile charging circuit and first battery, wherein each mobile charging circuit is configured to operably convert the supply power to a charging power for charging the corresponding first battery, wherein the mobile charging circuit is operable in at least two charging modes of a precharging (PC) mode, a constant current (CC) charging mode and a constant voltage (CV) charging mode, so as to charge the corresponding first battery;
• wherein the supply power has a supply voltage and a supply current;
• the charging control method comprising:
• step S1:
• gradually adjusting a level of the supply voltage within a preset voltage range and sense a level of the corresponding supply current through, or, to gradually adjust the level of the supply current within a preset current range and sense the level of the corresponding supply voltage, thereby establishing a current versus voltage characteristic curve corresponding to the supply power;
• and
• step S2:
• performing one of the following step S21 or S22 according to whether the current versus voltage characteristic curve has at least one mode inflection point and according to information indicated by the supply current and/or the supply voltage corresponding to the at least one mode inflection point in a situation where the at least one mode inflection point is present:
• step S21:
• determining a charging mode combination where the first mobile device and the second mobile device are in;
• or
• step S22:
• in the situation where the at least one mode inflection point is present, adjusting the supply voltage according to the information indicated by the supply current and/or the supply voltage corresponding to the at least one mode inflection point, so as to charge the first battery of the corresponding mobile device according to the supply voltage, such that a voltage drop of each mobile charging circuit is reduced.

A charging system, comprising:

• a plurality of mobile devices, which include a first mobile device and a second mobile device, wherein each of the plurality of mobile devices includes:
• a mobile charging circuit;
• a first battery, wherein each mobile charging circuit is configured to operably convert a supply power to a charging power for charging the corresponding first battery, wherein the mobile charging circuit is operable in at least two charging modes of a precharging (PC) mode, a constant current (CC) charging mode and a constant voltage (CV) charging mode, so as to charge the corresponding first battery;
• and
• a charging apparatus, which is coupled to the plurality of mobile devices in a removable way, wherein the charging control apparatus is configured to operably provide the supply power to the first mobile device and the second mobile device, wherein the charging control apparatus includes:
• a switching power converter, which is configured to operably convert an input power to the supply power, wherein the supply power has a supply voltage and a supply current;
• and
• a conversion control circuit, which is configured to operably control the switching power converter;
• wherein the conversion control circuit is configured to operably control the switching power converter according to the following steps:
• step S1:
• controlling the switching power converter to gradually adjust a level of the supply voltage within a preset voltage range and sense a level of the corresponding supply current through, or, to gradually adjust the level of the supply current within a preset current range and sense the level of the corresponding supply voltage, thereby establishing a current versus voltage characteristic curve corresponding to the supply power;
• and
• step S2:
• performing one of the following step S21 or S22 according to whether the current versus voltage characteristic curve has at least one mode inflection point and according to information indicated by the supply current and/or the supply voltage corresponding to the at least one mode inflection point in a situation where the at least one mode inflection point is present:
• step S21:
• determining a charging mode combination where the first mobile device and the second mobile device are in;
• or
• step S22:
• in the situation where the at least one mode inflection point is present, adjusting the supply voltage according to the information indicated by the supply current and/or the supply voltage corresponding to the at least one mode inflection point, so as to charge the first battery of the corresponding mobile device according to the supply voltage, such that a voltage drop of each mobile charging circuit is reduced.