Charger and electronic apparatus system

A charger capable of charging an electronic apparatus through a Universal Serial Bus, comprising:

• a charger main body having a power output unit which outputs charging power and a control unit which controls the power output unit;
• a positive-side charging path and a negative-side charging path for outputting, to the electronic apparatus, the charging power supplied from the power output unit;
• a connection unit which is coupled to the charger main body, which is connectable to the electronic apparatus, and which contains a part of the positive-side charging path and a part of the negative-side charging path respectively extended from the charger main body;
• at least one signal line which is extended from the charger main body, and which is arranged between the part of the positive-side charging path and the part of the negative-side charging path in at least the connection unit;
• and
• a temperature sensor which is provided in the vicinity of the part of the positive-side charging path in the connection unit, and which is configured to detect temperature information, a distance between a center of the temperature sensor and the part of the positive-side charging path in the connection unit being smaller than a distance between the center of the temperature sensor and the part of the negative-side charging path in the connection unit, a path surface area of the part of the positive-side charging path in the connection unit being smaller than a path surface area of the part of the negative-side charging path in the connection unit,
• wherein the control unit is capable of receiving the temperature information from the temperature sensor through the at least one signal line regardless of presence or absence of the connection to the electronic apparatus, and stops the output of the charging power from the power output unit if temperature detected by the temperature sensor is higher than or equal to a prescribed temperature.