Tablet PC is a digital product used by most people at present, which can use most desktop computers and is widely used. Tablet PC is mainly composed of built-in lithium ion battery (power supply), main control board and LCD display. External interface includes SD card, earphone interface, etc. Here's what the self-recovery fuse does in tablet applications.
First, solve the problem.
(1) mainly solve the short circuit and overload of the control circuit, and prevent the damage of the short circuit of the control circuit board to the power supply circuit of the lithium battery in assembly production;
(2) Self-recovery fuse is used to control the output of circuit and the 5V power cord of USB interface, which is mainly to avoid the short circuit of USB load burning the control circuit of tablet computer, and to avoid the wrong input current burning the internal circuit of tablet computer.
Second, the use position.
(1) a self-recovery fuse is adopted between the power output end of the lithium ion battery of the tablet computer and the power input end of the main control circuit;
(2) Self-recovery fuse is used between control circuit and USB serial data interface;
Third, the specific usage.
(1) the self-recovery fuse is connected in series between the output end of the lithium battery power supply of the tablet computer and the power input end of the control circuit;
(2) a self-recovery fuse is connected in series on the 5V power cord of the control circuit output and USB interface;
4. Are there any other protection methods?
(1) One-time current fuse was the most commonly used one before, which was eliminated because of high maintenance cost. This scheme was gradually eliminated, and PPTC was finally applied.
