Voltage-limiting and current-limiting protection circuit for electronic cigarette

Abstract

The voltage-limiting current-limiting protection circuit comprises a power supply, a booster circuit and a current-limiting feedback circuit, the output end of the power supply is in power supply connection with the input end of the booster circuit, and the output end of the booster circuit is in power supply connection with a smoke cartridge atomizer of the electronic cigarette. The input end of the current-limiting feedback circuit is electrically connected with a smoke cartridge atomizer of the electronic cigarette, the output end of the current-limiting feedback circuit is in feedback connection with the input end of the booster circuit, a booster management chip U1 is arranged in the booster circuit, and the booster circuit can limit the upper limit of power supply current passing through the smoke cartridge atomizer of the electronic cigarette according to a signal fed back by the current-limiting feedback circuit. The boost management chip has the beneficial effects that a common boost management chip has a voltage-limiting protection function and a current-limiting protection function at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of protection circuit, concretely relates to a voltage and current limiting protection circuit for electronic cigarette. BACKGROUND

[0002] Electronic cigarette is an electronic product that imitates cigarette, has the same appearance, smoke, taste and feeling as cigarette, it is a product that changes nicotine into steam through atomization and lets users smoke, and general electronic cigarette mainly consists of a smoke tube for storing nicotine solution, an evaporation device and a battery. The atomizer is powered by the battery rod, which can convert the liquid nicotine in the cartridge into mist, so that the user has a feeling similar to smoking when inhaling, realizing "swallowing cloud and spitting mist".

[0003] At present, the electronic cigarette on the market is generally composed of a cartridge and an electronic cigarette main body, the cartridge is generally composed of an oil tank and an atomizer that cannot be disassembled, and the user smokes after the oil in the oil tank is atomized by the atomizer. Among them, the atomizer currently mainly has two atomization methods: one is heating atomization, mainly using heating wire and heating mesh to heat and atomize the oil in the oil tank for smoking; the other is ultrasonic atomization, the cartridge is generally composed of an oil tank and an atomizer that cannot be disassembled, and the oil is atomized by ultrasonic waves for smoking. However, no matter which atomization method is used, the atomizer in the cartridge needs to be powered on, and the main control circuit board and power supply must be provided in the electronic cigarette main body.

[0004] In the prior art, the electronic cigarette generally uses a rechargeable battery as a power supply, and then a boost circuit is used to power the atomizer in the cartridge. However, due to the ordinary boost management chip in the boost circuit of the existing electronic cigarette, only the maximum voltage value can be set, the output voltage is used as the feedback signal, and the voltage limiting protection function is provided, but the maximum current value cannot be limited, and the overcurrent protection cannot be realized. If the current abnormally increases, the atomizer in the cartridge may be overloaded and burned out, and even a fire hazard may occur, which brings a very bad user experience. UTILITY MODEL CONTENTS

[0005] To solve the problems in the prior art, the utility model provides a voltage and current limiting protection circuit for electronic cigarette, by setting a power supply, a boost circuit and a current limiting feedback circuit in the voltage and current limiting protection circuit for electronic cigarette, the ordinary boost management chip can have the current limiting protection function while having the voltage limiting protection function, which greatly improves the use safety of the electronic cigarette and solves the problem that the ordinary boost management chip in the electronic cigarette in the prior art does not have the current limiting protection function.

[0006] The utility model provides a kind of for electronic cigarette's voltage limiting current limiting protection circuit, including power supply, boost circuit and current limiting feedback circuit, the output of power supply is connected with the input of boost circuit power supply, the output of boost circuit is connected with the supply of electronic cigarette's cartridge atomizer, the input of current limiting feedback circuit is connected with the supply of electronic cigarette's cartridge atomizer, the output of current limiting feedback circuit is connected with the input of boost circuit feedback, boost circuit is equipped with boost management chip U1, boost circuit can limit the upper limit of supply current through the cartridge atomizer of electronic cigarette according to the signal feedback of current limiting feedback circuit.

[0007] The utility model makes further improvement, current limiting feedback resistance R2 and diode D2 are equipped in current limiting feedback circuit, boost management chip U1 is equipped with 6 pins, one end of current limiting feedback resistance R2 is connected with the supply of electronic cigarette's cartridge atomizer, the anode of diode D2, the cathode of diode D2 is connected with the 3rd pin feedback of boost management chip U1, the other end of current limiting feedback resistance R2 is grounded.

[0008] The utility model makes further improvement, capacitor C1, resistance R1, resistance R3 and capacitor C3 are further equipped in boost circuit, the 4th, 5th pin of boost management chip U1 is connected with the output of power supply, one end of capacitor C3, the 3rd pin of boost management chip U1 is also connected with one end of resistance R1, one end of resistance R3, the other end of resistance R1 is connected with one end of capacitor C1, the supply of electronic cigarette's cartridge atomizer, the 2nd pin of boost management chip U1, the other end of capacitor C3, the other end of capacitor C1, the other end of resistance R3 are grounded.

[0009] The utility model makes further improvement, inductance L1 and diode D1 are further equipped in boost circuit, the 1st pin of boost management chip U1 is connected with one end of inductance L1, the anode of diode D1, the other end of inductance L1 is connected with the output of power supply, the cathode of diode D1 is connected with one end of capacitor C1, the supply of electronic cigarette's cartridge atomizer.

[0010] The utility model makes further improvement, the model of boost management chip U1 can be LN2220PAR.

[0011] The utility model makes further improvement, and power supply is rechargeable lithium battery.

[0012] Compared with the prior art, the utility model discloses a kind of voltage and current limiting protection circuit for electronic cigarette, by being arranged in the voltage and current limiting protection circuit for electronic cigarette mutually coordinated power supply, boost circuit and current limiting feedback circuit, boost circuit can limit the upper limit of the power supply current of the cartridge atomizer of electronic cigarette according to the signal feedback of current limiting feedback circuit, ordinary boost management chip can be realized to have voltage limiting protection function while having current limiting protection function, greatly improve the use safety of electronic cigarette, prolong the service life of electronic cigarette, improve user experience, solve the problem that ordinary boost management chip in electronic cigarette in prior art does not have current limiting protection function. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the scheme of the present utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0014] Figure 1 A circuit diagram of the voltage and current limiting protection circuit for electronic cigarette of the utility model. DETAILED DESCRIPTION

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present utility model belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the specification, claims and above-mentioned drawing description of the present utility model and the terms "include" and "have" and any modification thereof are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present utility model or the above-mentioned drawing description are used to distinguish different objects, not to describe a specific order.

[0016] In this paper, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present utility model. The phrase appears in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment independent of or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0017] In order to enable those skilled in the art to better understand the scheme of the present utility model, the technical solutions in the embodiments of the present utility model will be described clearly and completely in conjunction with the drawings.

[0018] AsFigure 1 As shown, this utility model provides a voltage and current limiting protection circuit for electronic cigarettes, including a power supply, a boost circuit, and a current limiting feedback circuit. The output terminal of the power supply is connected to the input terminal of the boost circuit, and the output terminal of the boost circuit is connected to the atomizer of the electronic cigarette cartridge. The input terminal of the current limiting feedback circuit is electrically connected to the atomizer of the electronic cigarette cartridge, and the output terminal of the current limiting feedback circuit is connected to the input terminal of the boost circuit. The boost circuit includes a boost management chip U1, which can be an LN2220PAR. The power supply is a rechargeable lithium battery. The current-limiting feedback circuit includes a current-limiting feedback resistor R2 and a diode D2. The boost management chip U1 has six pins. One end of the current-limiting feedback resistor R2 is connected to the atomizer of the e-cigarette cartridge and the positive terminal of the diode D2. The negative terminal of the diode D2 is connected to the third pin of the boost management chip U1 for feedback. The other end of the current-limiting feedback resistor R2 is grounded. The boost circuit also includes a capacitor C1, a resistor R1, a resistor R3, and a capacitor C3. The fourth and fifth pins of the boost management chip U1 are connected to one end of the capacitor C3 and the output terminal of the power supply. The third pin of the boost management chip U1 is also connected to... One end of resistor R1 and one end of resistor R3 are connected to the boost management chip U1. The other end of resistor R1 is connected to one end of capacitor C1 and the power supply to the e-cigarette cartridge atomizer. Pin 2 of boost management chip U1, the other end of capacitor C3, the other end of capacitor C1, and the other end of resistor R3 are grounded. The boost circuit also includes inductor L1 and diode D1. Pin 1 of boost management chip U1 is connected to one end of inductor L1 and the positive terminal of diode D1. The other end of inductor L1 is connected to the output terminal of the power supply. The negative terminal of diode D1 is connected to one end of capacitor C1 and the power supply to the e-cigarette cartridge atomizer. In this embodiment, the boost circuit can limit the upper limit of the power supply current through the e-cigarette cartridge atomizer according to the signal fed back by the current limiting feedback circuit, enabling a common boost management chip to have both voltage limiting protection and current limiting protection functions. When the e-cigarette is working normally, the voltage limit at pin FB of the boost management chip U1 is 0.6V. When the voltage division between resistors R1 and R3 reaches 0.6V, the voltage will not continue to rise, thus achieving the voltage limiting protection function. When the voltage generated by the current limiting feedback resistor R2 exceeds 0.6V, the voltage at pin FB of the boost management chip U1 also reaches the upper limit and will not continue to rise, thus achieving the current limiting protection function. This greatly improves the safety of using e-cigarettes, extends the lifespan of e-cigarettes, and enhances the user experience.

[0019] From above, the utility model provides a kind of voltage and current limiting protection circuit for electronic cigarette, by being mutually matched in the voltage and current limiting protection circuit for electronic cigarette and being arranged power supply, boost circuit and current limiting feedback circuit, boost circuit can limit the upper limit of the power supply current of the cartridge atomizer of electronic cigarette according to the signal feedbacked by current limiting feedback circuit, can realize to let ordinary boost management chip have current limiting protection function while having voltage limiting protection function, greatly improve the use safety of electronic cigarette, prolong the service life of electronic cigarette, improve user experience, solve the problem that ordinary boost management chip in the prior art in electronic cigarette does not have current limiting protection function.

[0020] The above-described specific embodiments are preferred embodiments of the present utility model, and are not intended to limit the specific implementation range of the present utility model. The scope of the present utility model includes, but is not limited to, the present specific embodiments. Any equivalent changes made in accordance with the present utility model are within the scope of protection of the present utility model.

Claims

1. A voltage and current limiting protection circuit for an electronic cigarette, characterized in that: The power supply, the boost circuit and the current limiting feedback circuit are included, the output end of the power supply is in power supply connection with the input end of the boost circuit, the output end of the boost circuit is in power supply connection with the cartridge atomizer of the electronic cigarette, the input end of the current limiting feedback circuit is in electrical connection with the cartridge atomizer of the electronic cigarette, the output end of the current limiting feedback circuit is in feedback connection with the input end of the boost circuit, the boost management chip U1 is arranged in the boost circuit, and the boost circuit can limit the upper limit of the power supply current through the cartridge atomizer of the electronic cigarette according to the signal fed back by the current limiting feedback circuit.

2. The voltage and current limiting protection circuit for an electronic cigarette of claim 1, wherein: The current limiting feedback resistor R2 and the diode D2 are arranged in the current limiting feedback circuit, the boost management chip U1 is provided with six pins, one end of the current limiting feedback resistor R2 is connected with the cartridge atomizer of the electronic cigarette and the anode of the diode D2, the cathode of the diode D2 is in feedback connection with the third pin of the boost management chip U1, and the other end of the current limiting feedback resistor R2 is grounded.

3. The voltage and current limiting protection circuit for an electronic cigarette of claim 2, wherein: The capacitor C1, the resistor R1, the resistor R3 and the capacitor C3 are further arranged in the boost circuit, the fourth pin and the fifth pin of the boost management chip U1 are connected with one end of the capacitor C3 and the output end of the power supply, the third pin of the boost management chip U1 is further connected with one end of the resistor R1 and one end of the resistor R3, the other end of the resistor R1 is in power supply connection with one end of the capacitor C1 and the cartridge atomizer of the electronic cigarette, and the second pin of the boost management chip U1, the other end of the capacitor C3, the other end of the capacitor C1 and the other end of the resistor R3 are grounded.

4. The voltage and current limiting protection circuit for an electronic cigarette of claim 3, wherein: The inductor L1 and the diode D1 are further arranged in the boost circuit, the first pin of the boost management chip U1 is connected with one end of the inductor L1 and the anode of the diode D1, the other end of the inductor L1 is connected with the output end of the power supply, and the cathode of the diode D1 is in power supply connection with one end of the capacitor C1 and the cartridge atomizer of the electronic cigarette.

5. The voltage and current limiting protection circuit for an electronic cigarette of claim 4, wherein: The model of the boost management chip U1 can be LN2220PAR.

6. The voltage and current limiting protection circuit for an electronic cigarette of claim 5, wherein: The power supply is a rechargeable lithium battery.

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