Self-recovery insurance in the application of car cigarette lighter
The electrical structure and function of the product: In the current car, the conversion of the power supply with the cigarette lighter is essential. For example, the navigator, mobile phone, and audio all need USB power supply, usually using a cigarette lighter. The way to convert over. Cigarette lighter is widely used in the automotive field, which is very convenient for people to use these devices. The current of the car is relatively large. During use, the cigarette lighter is easy to follow or the front end is faulty, and a large current is generated to damage the cigarette lighter itself or subsequent. Product, so we need to install a reliable self-recovering fuse on the cigarette lighter, PPTC, the following is the actual circuit of the application:
1. A PPTC self-recovery fuse is connected in series inside the cigarette lighter. When the rear device has a short circuit or the front end has abnormal current change, the PPTC quickly changes from low resistance to high resistance, and the current no longer passes, so that the latter The circuit no longer works, thus achieving the purpose of protection. Connectors that plug into the car's cigarette lighter power jack typically include mobile phones, future hands-free devices, and charging circuits for other battery-powered devices. Typical overcurrent protection, such as PPTC components, combined with overvoltage protection of the charging input, will help the device meet stringent electrical requirements. A PPTC component can be used to withstand damage from overcurrent and overvoltage faults.
Second, the specific use of PTC in the cigarette lighter device: (1), what part is the PTC used? PPTC to do overcurrent protection between the power supply, and the protection of the back-end equipment over-current, the cigarette lighter core circuit input and output overcurrent Protection circuit. (2) What problem is solved? PPTC mainly solves the following problems on the cigarette lighter: 1. External short-circuit over-current protection problem. (3), specific usage? PTC is directly connected in series at the output of the cigarette lighter, and the following PPTC models are applied: SR16-100/200/300/500 and so on. (4), is there any other usage? Please list the usage and explain the characteristics of the usage, and compare it with other usages? In the cigarette lighter protection, there is also a one-time fuse for protection. Glass tube fuses The advantage of this solution is the low cost. However, this application has been phased out, and the PPTC is used instead. Since the one-time fuse is only blown for overcurrent overload, there is no automatic recovery function, so it causes great inconvenience to the user, and the PPTC can change greatly in the current. Next, immediately protect, you can resume use after the new boot. In order to avoid damage to subsequent equipment and local equipment, it can be seen that PPTC is superior to disposable fuses. PPTC reflects superior time protection features.
3. What is the value of PTC's use on this product?
(1) What are the benefits of using PTC? (What problems have been solved? What are the possible hazards that have been avoided? This damage is harmful to potential economic benefits. It is explained by digitization. For brands, customers, repairs.....) The application of PPTC in the cigarette lighter can effectively solve the problem of output overload and internal and external short-circuit over-current protection, not only avoiding various safety hazards, but also improving the quality of customer products, reducing the cost of repair and maintenance of products, and increasing customers. The highlights of the product and the market competitiveness of the product. In the event of an overload or overcurrent condition, the lighter burns out the circuit itself and the machine equipment, causing a fire and causing property damage. In order to solve the problem of overloading internal and peripheral equipment and fires, PPTC is now used. This is the most Excellent program.
(2) Damage caused by not using PTC? When the PTC is not used, a one-time fuse is used for protection. When the disposable fuse encounters an overload, the temperature rises sharply and the fuse is blown, thereby disconnecting the power supply. Can no longer be used, must replace the new equipment or fuse to solve the problem, give the user a certain time to wait, if you do not use a disposable fuse, the consequences are more serious, if you use PPTC can effectively avoid the above problems.