Prevent the protective device that the microcontroller supply voltage falls in the electronics cigarette
Technical field
The utility model relates to electronic cigarette and electronics cigarette case technical field, relates in particular to a kind of electronic cigarette and electronics cigarette case that has a microcontroller, prevents the protective device that the microcontroller supply voltage falls.
Background technology
The microcontroller of present most electronic cigarette and electronics cigarette case is directly power supply of battery, a switch MOS FET(of microprocessor controls field-effect transistor) break-make of removing control load, as illustrated in fig. 1 and 2, this circuit comprises battery 100, microcontroller 200, field-effect transistor 300, wherein battery 100 is used to microcontroller 200 power supplies, and the signal output part of microcontroller 200 is used for the break-make of controlling filed effect transistor and controls electronics cigarette or the interior heating element of electronics cigarette case.There are some risks in the electric power-feeding structure of Fig. 1 and Fig. 2, such as working as electronics cigarette or electronics cigarette case under the situation of conducting MOSFET, when short circuit or overcurrent occurring, it is very fast that the microcontroller supply voltage can fall because of short circuit, when voltage drops to the minimum that is lower than microcontroller, microcontroller just may be in uncontrollable labile state, for a long time big electric current or short circuit may cause big electric current to burn out components and parts or the circuit of product inside, the uncontrollable state of microcontroller may cause other accidental damages, thus need a kind of circuit of exploitation postpone microcontroller supply voltage fall speed.
So there is defective in prior art, need to improve.
The utility model content
The technical problems to be solved in the utility model is; under overcurrent or short-circuit conditions, be in uncontrollable labile state at the microcontroller that exists in the prior art; burn out defectives such as the components and parts of product inside or circuit; provide in a kind of electronics cigarette and utilize accumulator to postpone the protective device that the microcontroller supply voltage falls, reach the purpose of protective circuit.
The technical scheme that its technical problem that solves the utility model adopts is: prevent the protective device that the microcontroller supply voltage falls in a kind of electronics cigarette, comprise microcontroller, power module and field-effect transistor, described power module is used to described microcontroller that power supply is provided, it is characterized in that, also comprise accumulator, described accumulator is connected between described microcontroller and the described power module, described accumulator is used for providing supply voltage for described microcontroller in the certain hour section when overcurrent or short circuit take place, postpone the drop of the supply voltage of described power module or described microcontroller; Described microcontroller is used for handling described overcurrent or short-circuit signal in the described time period, the output control signal is to close described field-effect transistor.
Described device, wherein, described accumulator comprises a diode and a storage capacitor, described diode cathode connects the positive pole of described power module, the negative pole of described diode connects an end of described microcontroller positive power source terminal and described storage capacitor respectively, the other end of described storage capacitor is connected with described microcontroller negative power end with described power module negative pole, described accumulator is used for when overcurrent or short circuit taking place cause described power module voltage falling, be the power supply of described microcontroller by described storage capacitor, and block described storage capacitor by described diode described power module is discharged.
Described device, wherein, described accumulator comprises a diode and a storage capacitor, one end of described storage capacitor connects the positive power source terminal of described power module positive pole and described microcontroller respectively, the other end of described storage capacitor connects the negative power end of described diode cathode and described microcontroller respectively, the negative pole of described diode connects the negative pole of described power module, described accumulator is used for when overcurrent or short circuit taking place cause described power module voltage falling, be the power supply of described microcontroller by described storage capacitor, stop the quick drop of described power module voltage simultaneously, and block described storage capacitor by described diode described power module is discharged.
Described device wherein, also comprises overcurrent or short-circuit detecting module, and described overcurrent or short-circuit detecting module are used for the operating current of real-time detection line, and institute's detection data are offered described microcontroller.
Described device, wherein, the signal output part of described microcontroller is connected to the grid of described field-effect transistor, and the source electrode of described field-effect transistor links to each other with the negative pole of described power module, and the drain electrode of described field-effect transistor connects external load.
Described device, wherein, the signal output part of described microcontroller is connected to the grid of described field-effect transistor, and the source electrode of described field-effect transistor connects external load, and the drain electrode of described field-effect transistor connects the positive pole of described power module and the positive pole of described diode.
Described device, wherein, the signal output part of described microcontroller is connected to the grid of described field-effect transistor, the source electrode of described field-effect transistor respectively with the negative pole of described power module and the negative pole of described diode, the drain electrode of described field-effect transistor connects external load.
Described device, wherein, the signal output part of described microcontroller is connected to the grid of described field-effect transistor, the drain electrode of described field-effect transistor links to each other with the positive pole of described power module and with an end of described storage capacitor and the positive power source terminal of described microcontroller respectively, and the source electrode of described field-effect transistor connects external load.
Described device, wherein, described microcontroller is single-chip microcomputer or CPU.
The utility model discloses and prevent protective device and the method that the microcontroller supply voltage falls in a kind of electronics cigarette, have following beneficial effect: this device utilizes and connect an accumulator between microcontroller and power module, when circuit generation overcurrent or short circuit, power to microcontroller by accumulator, make microcontroller in the certain hour section, keep normal working voltage; Treat microcontroller determine overcurrent or short circuit after, close MOSFET; stop the output of electric current, reached the purpose of protection electronics smoke product, the designed circuit of the utility model is simple; cost is lower, has also solved the generation of the unsettled uncontrollable phenomenon of existing microcontroller in the prior art.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is power supply circuits embodiment one schematic diagram of prior art electronics cigarette microcontroller;
Fig. 2 is power supply circuits embodiment two schematic diagrames of prior art electronics cigarette microcontroller;
Fig. 3 is that the utility model prevents the protective device circuit block diagram that the microcontroller supply voltage falls;
Fig. 4 is the circuit diagram that the utility model prevents the protective device embodiment one that the microcontroller supply voltage falls;
Fig. 5 is the circuit diagram that the utility model prevents the protective device embodiment two that the microcontroller supply voltage falls;
Fig. 6 is the circuit diagram that the utility model prevents the protective device embodiment three that the microcontroller supply voltage falls;
Fig. 7 is the circuit diagram that the utility model prevents the protective device embodiment four that the microcontroller supply voltage falls.
Embodiment
Under overcurrent or short-circuit conditions, be in uncontrollable labile state in order to solve the microcontroller that exists in the prior art; burn out defectives such as the components and parts of product inside or circuit; the utility model provides a kind of protective device that the microcontroller supply voltage falls that postpones; its core concept is: connect an accumulator between microcontroller and power module; accumulator is used for when load generation overcurrent or short circuit; in the certain hour section, provide supply voltage for microcontroller; this voltage is less than the microcontroller normal working voltage but be higher than the minimum of microcontroller; avoided causing that because of load generation overcurrent or short circuit the supply voltage of battery or microcontroller drops fast; the situation that causes the microcontroller cisco unity malfunction; described microcontroller utilizes this time period; handle overcurrent or short-circuit detection signal; the output control signal is to close described field-effect transistor; disconnection is to the power supply of load; realization has solved the generation of the unsettled uncontrollable phenomenon of existing microcontroller in the prior art to overcurrent or the short-circuit protection of electronics cigarette.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 3 prevents the protective device circuit block diagram that the microcontroller supply voltage falls for the utility model, wherein, in this circuit, comprise power module 100, microcontroller 200, field-effect transistor 300 and accumulator 400, also comprise overcurrent or short-circuit detecting module, described overcurrent or short-circuit detecting module are used for the operating current of real-time detection line, and institute's detection data are offered described microcontroller (indicate on the figure, omit); Accumulator 400 is arranged between power module 100 and the microcontroller 200; power module 100 links to each other with microcontroller 200; be used to microcontroller 200 that power supply is provided; accumulator is used to microcontroller 200 to provide the certain hour section interior normal working voltage; the drop of the supply voltage of deferred telegram source module 100 or microcontroller 200; microcontroller 200 links to each other with field-effect transistor 300; and link to each other with overcurrent or short-circuit detecting module; the operating current that is used for real-time detection line; and data are detected in institute offer microcontroller 200; microcontroller 200 is for after detection in this time period and judging generation overcurrent or short circuit; handle by 200 pairs of overcurrents of microcontroller or short-circuit signal; the output control signal reaches the purpose of protective circuit to close field-effect transistor 300.
Wherein, the utility model microcontroller 200 can be selected single-chip microcomputer for use, CPU or logic control device, microcontroller comprises 3 pins, and the 1st pin is the microcontroller positive power source terminal, and the 3rd pin is the microcontroller negative power end, the 2nd pin is signal output part, power module 100 is rechargeable battery, and field-effect transistor 300 models are AO3400 or DTS2300 preferably, certainly in the practical application and be limited to above-mentioned selected model.
Accumulator 400 of the present utility model comprises a diode (D) and a storage capacitor (C), in the utility model specific embodiment 1, (see shown in Figure 4), the positive pole of diode (D) connects the positive pole of battery 100, the negative pole of diode (D) connects the 1st pin (positive power source terminal) of microcontroller 200 and an end that connects storage capacitor (C) respectively, the other end of storage capacitor (C) links to each other with the negative pole of battery 100 and the 3rd pin of microcontroller 200 respectively, accumulator 400 is used for when overcurrent or short circuit taking place cause the voltage falling of battery 100, be microcontroller 200 power supply by storage capacitor (C), and block storage capacitor (C) to the discharge of battery 100 by diode (D), the 2nd pin of microcontroller 200 is connected to the grid of field-effect transistor 300, the source electrode of field-effect transistor 300 links to each other with the negative pole of battery 100, and the drain electrode of field-effect transistor 300 connects external load.
In the utility model specific embodiment 2, (see shown in Figure 5), the positive pole of diode (D) connects the positive pole of battery 100, the negative pole of diode (D) connects the 1st pin (positive power source terminal) of microcontroller 200 and an end that connects storage capacitor (C) respectively, the other end of storage capacitor (C) links to each other with the negative pole of battery 100 and the 3rd pin of microcontroller 200 respectively, accumulator 400 is used for when overcurrent or short circuit taking place cause the voltage falling of battery 100, be microcontroller 200 power supply by storage capacitor (C), and block storage capacitor (C) to the discharge of battery 100 by diode (D), the 2nd pin of microcontroller 200 is connected to the grid of field-effect transistor 300, the source electrode of field-effect transistor 300 connects external load, the drain electrode of field-effect transistor 300 connects the positive pole of battery 100 and the positive pole of diode (D), the accumulator 400 of embodiment 1 and embodiment 2 type of attachment with battery 100 and microcontroller 200 in circuit is identical, institute's difference is the connected mode difference of field-effect transistor 300, sees Fig. 4 and shown in Figure 5 for details.
In the utility model specific embodiment 3, (see shown in Figure 6), storage capacitor in the accumulator 400 (C) end connects the positive pole of battery 100 and the positive power source terminal of microcontroller (the 1st pin) respectively, the other end of storage capacitor (C) connects the positive pole of diode (D) respectively, the negative power end of microcontroller 200 (the 3rd pin), the negative pole of diode (D) connects the negative pole of battery 100, accumulator 400 is used for when overcurrent or short circuit taking place cause battery 100 voltage fallings, be microcontroller 200 power supply by storage capacitor (C), stop the quick drop of battery 100 voltages simultaneously, and block the discharge of the battery 100 of storage capacitor C by diode (D).The signal output part of microcontroller 200 in the present embodiment (the 2nd pin) is connected to the grid of field-effect transistor 300, the source electrode of field-effect transistor 300 respectively with the negative pole of battery 100 and the negative pole of diode D, the drain electrode of field-effect transistor 300 connects external load.
In the utility model specific embodiment 4, (see shown in Figure 7), storage capacitor in the accumulator 400 (C) end connects the positive pole of battery 100 and the positive power source terminal of microcontroller (the 1st pin) respectively, the other end of storage capacitor (C) connects the positive pole of diode (D) respectively, the negative power end of microcontroller 200 (the 3rd pin), the negative pole of diode (D) connects the negative pole of battery 100, accumulator 400 is used for when overcurrent or short circuit taking place cause battery 100 voltage fallings, be microcontroller 200 power supply by storage capacitor (C), stop the quick drop of battery 100 voltages simultaneously, and block the discharge of the battery 100 of storage capacitor C by diode (D).The signal output part of microcontroller 200 in the present embodiment (the 2nd pin) is connected to the grid of field-effect transistor 300, the drain electrode of field-effect transistor 300 links to each other with the positive pole of battery 100, the end of storage capacitor C and the positive power source terminal (the 1st pin) of microcontroller 200 respectively, and the source electrode of field-effect transistor 300 connects external load; The accumulator 400 of embodiment 3 and embodiment 4 type of attachment with battery 100 and microcontroller 200 in circuit is identical, and institute's difference is the connected mode difference of field-effect transistor 300, sees for details shown in Fig. 6 and 7.
Accumulator of the present utility model is used for when overcurrent or short circuit taking place cause the power module voltage falling, the characteristic of utilizing storage capacitor C voltage not suddenly change, be microcontroller power supply by this storage capacitor, and utilize the unilateal conduction characteristic of diode D, block the discharge of the battery of storage capacitor C and external load by diode.
The guard method that prevents that the microcontroller supply voltage from falling of the present utility model mainly comprises the steps:
S1, the real-time operating current of detection line, and data are detected in institute offer microcontroller, when detecting overcurrent or short circuit, the while cell voltage falls;
Accumulator work between S2, microcontroller and the battery, the drop by accumulator obstruction cell voltage or microcontroller supply voltage makes microcontroller keep normal working voltage in the certain hour section;
S3, microcontroller in this time period (namely under the normal power source electric power thus supplied) are handled overcurrent or short-circuit signal, and microcontroller output control signal is cut off electric current to cut off field-effect transistor.
In Fig. 4 and Fig. 5, the certain hour section of microcontroller is the discharge time of storage capacitor C; In Fig. 6 and Fig. 7, the certain hour section of microcontroller is the discharge time of storage capacitor C, and be storage capacitor C is discharged to the minimum of microcontroller from the microcontroller normal working voltage time this discharge time.Described accumulator is used for when overcurrent or short circuit taking place cause the power module voltage falling, the characteristic of utilizing capacitance voltage not suddenly change, be the power supply of described microcontroller by described storage capacitor, and utilize diode unilateal conduction characteristic, block described storage capacitor to the discharge of described power module and external load by described diode.
In sum, because the utility model connects an accumulator between described microcontroller and battery, between microcontroller and power module, connect an accumulator, by accumulator after circuit generation overcurrent or short circuit, the drop of the supply voltage of deferred telegram source module or microcontroller makes microcontroller keep normal working voltage in the certain hour section; Microcontroller was handled overcurrent or short-circuit signal in this time period; the output control signal is to close field-effect transistor; cut off electric current; realization is to overcurrent or the short-circuit protection of electronics cigarette; solved the generation of the unsettled uncontrollable phenomenon of existing microcontroller in the prior art, realized effectively the overcurrent of electronics cigarette or the protection of short circuit.
Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.