Introduction to emergency charging for mobile phones:

We know that the charging of lithium batteries is a very complex process, and many well-known IC design companies have specialized chips for lithium battery charging. Meanwhile, the charging scheme for lithium batteries is also relatively mature. Currently, there are relatively mature travel chargers available in the market for mobile phone chargers. The working principle of this charger is usually that the mains power is transformed and rectified to obtain a DC power supply of about 7V, and then directly charged to the phone. This method is relatively simple, inexpensive, and does not require high efficiency. However, this type of charger cannot be a true travel charger, as its power source comes from AC power. In environments where AC power cannot be found, its application is greatly limited.

Recently, a mobile emergency charger that directly uses a battery as the power source has appeared on the IS420YDIAS1B market. The input power supply usually has one lithium battery, one dry battery, two dry batteries, or even three dry batteries. Of course, other batteries can also be used as power sources, such as fuel cells, air cells, solar cells, and so on. The charging principle of this type of charger is usually to pass the battery voltage through a boost power supply system, which usually outputs 5-6V and has a load capacity ranging from tens of milliamperes to hundreds of milliamperes.

PT1301 Emergency Charging Scheme for Mobile Phone PT1301 is a low startup voltage (as low as 0.8V), high-efficiency boost DC-DC converter. The emergency charger for mobile phones implemented with PT1301 has the following advantages:

1. Low startup voltage: This feature is well reflected when inputting a single dry battery. In practical applications, IS420YDIAS1B users often need to make phone calls during the charging process, and when unplugging and reinserting the charger, they find that they cannot continue charging. This is because some mobile phones have the function of detecting the initial charging current. When the initial charging current is less than the set value, the charging function cannot be completed. The single section scheme implemented with PT1301 can still carry a load of 180mA after starting at an input voltage of 1.2V, which effectively solves this problem.

2. Larger charging current: single energy-saving charging current 300mA, double section 500mA

3. Extremely high battery utilization: During the charging process, the PT1301 mobile phone emergency charging plan will detect the input voltage. When the input voltage decreases, the output current will also decrease. In this way, even if the battery voltage drops to 0.7V (single cell) or 1.5V (double cell) during continuous charging, it can still maintain charging.

4. Output power protection: The PT1301 emergency charging scheme for mobile phones has a dynamic load adjustment rate function. Adjust the output power according to the size of the output current. When the output current is too large, reduce the output voltage to maintain a constant output power.

5. High efficiency: The PT1301 emergency charging solution for mobile phones has high efficiency. The efficiency of a single section scheme is greater than 75% when inputting 1.5V; Even with an input voltage of 1V, it has an efficiency of over 70%. The efficiency of the dual section plan can even reach 87%

Single section emergency charging plan