An electronic timepiece includes: a power source; a correlation computation unit executing correlation computation processing of sequentially computing a correlation value between a signal sample and a plurality of codes corresponding to a plurality of satellites; a power source voltage determination unit to which a voltage of a power source is inputted and which determines whether the inputted voltage is lower than a first threshold or not, or whether the voltage exceeds a second threshold set to be equal to or higher than the first threshold; and a correlation computation control unit controlling the correlation computation unit to interrupt the correlation computation processing when the power source voltage determination unit determines that the voltage is lower than the first threshold, and to resume the correlation computation processing when the power source voltage determination unit determines that the voltage exceeds the second threshold.

An electronic timepiece includes: a power source; a correlation computation unit executing correlation computation processing of sequentially computing a correlation value between a signal sample and a plurality of codes corresponding to a plurality of satellites; a power source voltage determination unit to which a voltage of a power source is inputted and which determines whether the inputted voltage is lower than a first threshold or not, or whether the voltage exceeds a second threshold set to be equal to or higher than the first threshold; and a correlation computation control unit controlling the correlation computation unit to interrupt the correlation computation processing when the power source voltage determination unit determines that the voltage is lower than the first threshold, and to resume the correlation computation processing when the power source voltage determination unit determines that the voltage exceeds the second threshold.

A caseback has multiple, arc-shaped, ferrous, metal contacts that serve a dual purpose. The metal contacts i) establish an input connection between a battery for the wearable electronic device and charging prongs of a charger and ii) establish a magnetic coupling between the wearable electronic device and multiple magnets in the charger to hold the metal contacts of the wearable electronic device and the charging prongs of the charger in place during a charging of the battery. A male extension extends from a surface of the caseback to couple into a female receptor of the charger. i) The ferrous metal contacts' relationship with a positioning of the magnetics in the charger in combination with ii) the male extension coupling into the female receptor use magnetic and mechanical coupling to establish and control an alignment of the metal contacts with the charging prongs in three dimensions, a Z-axis, an X-axis, and a Y-axis.

A caseback has multiple, arc-shaped, ferrous, metal contacts that serve a dual purpose. The metal contacts i) establish an input connection between a battery for the wearable electronic device and charging prongs of a charger and ii) establish a magnetic coupling between the wearable electronic device and multiple magnets in the charger to hold the metal contacts of the wearable electronic device and the charging prongs of the charger in place during a charging of the battery. A male extension extends from a surface of the caseback to couple into a female receptor of the charger. i) The ferrous metal contacts' relationship with a positioning of the magnetics in the charger in combination with ii) the male extension coupling into the female receptor use magnetic and mechanical coupling to establish and control an alignment of the metal contacts with the charging prongs in three dimensions, a Z-axis, an X-axis, and a Y-axis.

A thermoelectric watch including a thermoelectric generator; a voltage booster connected to the thermoelectric generator; an energy management circuit connected to the voltage booster and configured to control the charging of at least one energy storage element, the energy management circuit including an output configured to change from a first logic state to a second logic state when the thermoelectric generator starts generating electrical energy, and to change from the second logic state to the first logic state when the thermoelectric generator finishes generating electrical energy.

A thermoelectric watch including a thermoelectric generator; a voltage booster connected to the thermoelectric generator; an energy management circuit connected to the voltage booster and configured to control the charging of at least one energy storage element, the energy management circuit including an output configured to change from a first logic state to a second logic state when the thermoelectric generator starts generating electrical energy, and to change from the second logic state to the first logic state when the thermoelectric generator finishes generating electrical energy.

This Application pertains to a charging control method including: setting a temperature range when a wearable electronic device is being charged according to a user demand; when the charging starts, turning on a wirelessly receiving coil of the wearable electronic device and using it to generate a charging current for charging the wearable electronic device; when it is monitored that a value of the charging current of the wearable electronic device rises to a preset constant-current charging current value, acquiring in real time a temperature value of the wearable electronic device; and judging whether the temperature value is within the temperature range; and if yes, maintaining the present value of the charging current of the wearable electronic device; and if not, changing the value of the charging current of the wearable electronic device, so that the temperature value of the wearable electronic device is within the temperature range.

This Application pertains to a charging control method including: setting a temperature range when a wearable electronic device is being charged according to a user demand; when the charging starts, turning on a wirelessly receiving coil of the wearable electronic device and using it to generate a charging current for charging the wearable electronic device; when it is monitored that a value of the charging current of the wearable electronic device rises to a preset constant-current charging current value, acquiring in real time a temperature value of the wearable electronic device; and judging whether the temperature value is within the temperature range; and if yes, maintaining the present value of the charging current of the wearable electronic device; and if not, changing the value of the charging current of the wearable electronic device, so that the temperature value of the wearable electronic device is within the temperature range.

An electronic apparatus includes a secondary battery, a first power feeder, a second power feeder, and a processor. The first power feeder feeds power to the secondary battery. The second power feeder feeds power to the secondary battery at a current larger than a current fed by the first power feeder. The processor selects an operation mode of the electronic apparatus based on different reference values selected based on whether the first power feeder is feeding power to the secondary battery or the second power feeder is feeding power to the secondary battery.

An electronic apparatus includes a secondary battery, a first power feeder, a second power feeder, and a processor. The first power feeder feeds power to the secondary battery. The second power feeder feeds power to the secondary battery at a current larger than a current fed by the first power feeder. The processor selects an operation mode of the electronic apparatus based on different reference values selected based on whether the first power feeder is feeding power to the secondary battery or the second power feeder is feeding power to the secondary battery.