NTC thermal resistance used by charging treasure (mobile power supply).Pyroelectric infrared sensor

　　The charging treasure (mobile power) promotes social progress and improves the battery life of portable devices (such as mobile phones, palms on the computer and laptop). The service life of the charging treasure depends to a large extent on the definition of the charging program. In this program, the charging current is matched with the temperature, especially in fast charging.

　　The earliest nickel -cadmium batteries were used in mobile phones. Later, nickel -cadmium batteries were replaced by more powerful nickel -metalized batteries and are currently replaced by lithium ion batteries. The latest lithium polymer battery has a better weight/volume/performance ratio than nickel -based solutions. Therefore, the current charging treasure (mobile power supply) on the market basically uses the latest lithium battery technology.

　　The circuit of the charging treasure (mobile power supply) must be matched with various battery systems, especially the height charging and working temperature. Table 1 gives an overview of the temperature range allowed by slow and fast charging, and Table 2 gives various charging requirements for recharging batteries. In various mechanisms used to protect them, temperature monitoring circuits and negative temperature coefficients (eg, NTC thermistor) are particularly important. NTC thermist resistance monitoring the battery temperature; when used in intelligent protection circuits, they can prevent the temperature increased due to excessive current. Based on voltage measurement, they can also monitor battery battery. NTC thermal resistance monitoring the upper and lower limit temperature of the charging treasure to achieve rapid charging, especially the rapid charging of the lithium battery mobile power supply. The charging of temperature control increases the number of charging and discharge cycles (Figure 1), which enhances safety and makes full use of the battery capacity. There are many ways to monitor the temperature of the charging process.

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