USB environmental electronic cigarette lighter design

Portable electronic cigarette lighters are also called electronic lighters. It consists of a built-in lithium ion battery and heating wire, charging circuit, battery protection circuit, and casing. The environmentally friendly electronic cigarette lighter is powered by a battery. The battery can be charged and discharged hundreds of times. (If the battery is not fully discharged, the charge will extend the battery life.)

The value of the electronic cigarette lighter is not only a problem of good use, but also a problem of safety and convenience. 1. As long as you drive, you don't have to worry about not having a lighter. 2. You can't put a liquid lighter in the car. Otherwise, it will blew and even hurt people when the temperature is high. It can automatically send cigarettes to smoke, which is easy to operate and highly automated. USB interface rechargeable cigarette lighter, heating wire heating, no open flame, good windproof effect! Therefore, the electronic cigarette lighter is still very marketable.

Below we share a usb electronic cigarette lighter design.

The electronic cigarette lighter comprises a casing, a circuit board, a cigarette lighter, and the cigarette lighter is composed of a heating wire, a cigarette carrier, a cigarette placing position, a tobacco feeding rod and an electric motor, and the heating wire is located at the cigarette end of the cigarette placing position, and the cigarette holder is The rack is located below the cigarette placing position, one end of the cigarette rod is located below the cigarette placing position, and the other end is connected to the motor, and the cigarette holder has a cigarette outlet at the cigarette butt corresponding to the cigarette placing position.

The electronic cigarette lighter control IC is designed with an ASIC for a new electronic cigarette lighter solution with physical switches.

The working state of the chip is stable, there will be no crash of the current MCU scheme, and the chip cannot be reset due to lower than the threshold voltage; the low power design, the quiescent current in the power saving mode is less than 3uA, and the standby is guaranteed. The battery life of the state; while the current of the heating wire is more than 2A when the cigarette is smoked, the speed of the cigarette is guaranteed, and the short-circuit protection function of the heating wire is provided, and the output is cut off when the load resistance is less than 1 ohm; and the chip has a visual LED. Work indication function, according to different application status, has different LED indications in chip startup, cigarette light time, short circuit protection, voltage detection, and charging process; excellent charging performance, including charging control circuit, supporting ordinary AC adapter And USB and other charging devices, when the lithium battery voltage is less than 2.7V for trickle charging, can ensure that the battery is not damaged, to ensure safety; when charging above 2.7V, start high-current charging, when the voltage is close to 4.2V, the charging current is gradually decline. The charging voltage detection error can be within 1%. There is a separate charging port VCC, which can also be used for cigarettes when charging.

The peripheral application circuit is simple. IC integrated power tube, easy to process, reduce loss; SOP8 package, small size; few external components, only one LED light, one capacitor and one switch, the system cost is low.

Characteristics

■ Adopt ASIC design

■In the power saving mode, the quiescent current is small ("3uA")

■Including short circuit protection (SCP)

■With undervoltage protection (UVLO)

■Including overheat protection (OTP)

■Overcurrent protection (OCP)

■ 10s protection when smoking cigarettes

■LED work indication function

■ Wide voltage charging (4.5-5.5V), excellent charging performance, safe charging process

■The charging voltage detection error is high (within 1%)

■ Perfect battery protection function to effectively protect the battery

■ Add an independent charging port, you can also smoke when charging

■ Trickle charging is used when the battery voltage is lower than 2.7V. When it is larger than 2.7V and less than 4.2V, it is charged with high current, and when it is close to 4.2V, it is charged with constant voltage.

■The system peripheral application circuit is simple and low cost

Circuit internal structure diagram

The electronic cigarette lighter usb interface is only used for charging. The electronic cigarette lighter usb interface can be connected to any output voltage of the computer, mobile phone charger, etc., DC5V+0.5V, and the output current is charged below 3000MA.

For initial use or unused for a long time, please connect the charger first, then disconnect and reconnect the charger for charging. Disconnect the power immediately after fully charged. (Normally, the full charging time is 3 hours.) Do not connect the fully charged battery to the power supply for a long time. Overcharging will shorten the battery life.

a, D1 is a Schottky diode (package SS14). A Schottky Barrier Diode is used instead of a normal diode. The advantage of a Schottky diode is that the forward bias voltage is low, so that the lost voltage drop is small.

b, U1 transistor (package: SOT-23). This low power transistor. The triode has a current amplification effect, which is essentially that the triode can control a large amount of change in the collector current with a small amount of change in the base current. This is the most basic and important feature of a triode. Then the triode here is to amplify the current of the usb, and then when the shrapnel is in contact with the electric shock, a large current is applied at both ends of the heating wire to cause the heat to be generated. 　　

Electric heating wire is a consumable item, so the service life of the electronic cigarette lighter depends largely on the heating wire. There are two main reasons for the loss of electric heating wire: one is the human factor; the other is the design problem of the heating wire itself.

In terms of human factors, it is mainly caused by the user's improperness. Proper use should be to put the cigarette right on the heating wire, slowly approach it, and minimize direct touch.

In the design of the heating wire, a good design method can also reduce the loss of the heating wire. The electric heating wire on the common electronic cigarette lighter on the market is unprotected, and the cigarette is very easy to touch the electric heating wire. If the force of the touch is larger, the electric heating wire may be damaged.

1. How long does it take to charge normally?

It is enough that the lighter has no electricity for three hours.

2. How to charge?

The electronic cigarette lighter will be equipped with a USB cable for easy charging. Generally, the main charging method is to charge the USB interface of the computer. In addition, since the state mandates that all mobile phone chargers are connected to the standard USB interface, the standard charger is used. Charging is also possible.

3. When is charging best?

Lithium batteries have no memory. They can be charged and used during use. It is not necessary to wait until there is no electricity to charge. It doesn't matter if you don't use it.

4. How long can I use when fully charged?

Everyone has a different amount of smoking, plus factors such as helping friends to smoke, it is difficult to calculate the time, conservative calculations can be charged with five or six packs of cigarettes.

5, using the battery power supply voltage is low, the heating wire will be red is not very slow?

Due to the unique design of the internal circuit and the selection of the heating wire material, when the cigarette is smoked, the switch is simultaneously pulled down and the smoke is brought close to the heating wire. When the cigarette is attached to the electric heating wire, the heating wire is heated enough to ignite the cigarette. I don't feel any impact.

6. What are the special points to pay attention to during use?

Do not put this product in water or other liquids first, as this will cause a short circuit. Since the cigarette needs to be in contact with the heating wire when the cigarette is smoked, special care should be taken not to press the heating wire too hard. If the tobacco and other objects fall into the heating wire, please clean it in time to facilitate prolonging the service life of the product. When the battery power will be close, the heating wire will heat up more slowly. Please charge it in time after use. 7. Can I smoke when charging?

This product can be smoked when charging, but the premise is that it can be charged after a period of time. If there is no electricity, the charging is not able to smoke.

8. Why is it automatically turned off after more than ten seconds?

Because this product is equipped with intelligent UI control system, the cover is automatically powered off after 15s, and it is safer and more secure, which also prolongs the service life of the battery.

9. Why is the shell a little hot after continuous use?

This is a normal situation, the battery will generate heat under continuous discharge, which does not affect the quality of the product, you can use it with confidence.

10. Can the heating wire be replaced?

The company's products are all designed with replaceable heating wire, and are also equipped with a spare heating wire and a small screwdriver, which can be replaced by themselves.