Nowadays, the use of resettable fuses is becoming more and more widespread, especially the use of PPTC resettable fuses on tablet computers.
The use of PPTC self-recovery fuses in tablet products:
1. Where to use
A, PPTC self-recovery fuse can be used between the output terminal of the lithium ion battery power supply of the tablet computer and the power input terminal of the main control circuit;
B. Self-recovery fuses are used between the control circuit and the USB serial data interface.
2. What problems are solved
a. The self-recovery fuse is used between the output terminal of the power supply of the tablet computer and the power input terminal of the control circuit; the first solution is to solve the short circuit and overload of the control circuit of the tablet computer and prevent the short circuit of the control circuit board in the assembly production to the lithium battery power circuit Damage.
b. PPTC self-recovery fuse is used to control the circuit output and the 5V power line of the USB interface. The main purpose is to prevent the USB load short circuit from burning the tablet's control circuit, and also to prevent the wrong input current from burning the tablet's internal circuit. .
3. Detailed usage
A. A recoverable fuse (depending on the current size) is connected in series between the output terminal of the lithium battery power supply of the tablet computer and the power input terminal of the control circuit, and some tablet computers have slightly higher power.
B. On the 5V power line of the output of the control circuit and the USB interface, a recoverable fuse (depending on the size of the current) can be connected in series.
4. Is there any other protection method?
The one used most is the one-time current fuse, which has been screened due to the high cost of frequent repairs and maintenance. Now there are also those that use one-time fuses. Only the fuse with a larger current is used, and less is broken. More is the use of insurance Resistance, this scheme will also be gradually screened, and eventually use PPTC resettable fuses.