Cold light screen driving circuit based on high-frequency boosting and electronic cigarette

Abstract

The utility model provides a cold light screen drive circuit based on high frequency boost and an electronic cigarette, the cold light screen drive circuit comprises a first boost module, a second boost module, a control module, a cold light screen control module and a cold light screen, the output end of the first boost module is connected with the input end of the second boost module; the output end of the second boosting module is connected with the cold light screen; the input end of the control module is connected with power supply voltage, the control module outputs a high-frequency boosting driving signal to the input end of the second boosting module and outputs a cold light screen control signal to the input end of the cold light screen control module, and the output end of the cold light screen control module is connected with the cold light screen. According to the utility model, high-frequency boosting is carried out on the power supply voltage through the two-stage boosting circuit, the miniaturization, lightening and thinning of the electronic cigarette circuit are met, the voltage frequency is higher than the frequency range which can be heard by human ears, squeal of the second boosting module is avoided, and the use experience of a user is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic cigarette field especially, relate to a cold light screen drive circuit and electronic cigarette based on high frequency boost. BACKGROUND

[0002] Electronic cigarette shell commonly uses flexible screen full package structure to realize dynamic display, enhance the aesthetic degree of electronic cigarette in sensory vision, and the cold light sheet screen has good flexibility and is suitable for making full package electronic cigarette product. The existing electronic cigarette uses a lithium battery for power supply, the working voltage of the lithium battery is between 3-4.2V, and the general working voltage of the cold light screen is adjusted to high voltage 110V, and the operating frequency is between 50-5000HZ, so it is necessary to boost the voltage of the lithium battery in the application of the electronic cigarette.

[0003] At present, part of electronic products on the market reduce the voltage of the lithium battery to stable 3V output through LDO (low dropout regulator), and then boost the voltage to 110V through a transformer, so as to drive the cold light screen. Generally speaking, the frequency range that can be heard by human ear is 20-20kHz, and the voltage frequency in the transformer is usually lower than 20KHz, which is in the hearing range of human ear, so that the transformer produces the howling that can be captured by human ear, and affects the smoking experience of the user.

[0004] Therefore, the prior art still needs to be improved and developed. UTILITY MODEL CONTENT

[0005] In view of the above problems of the prior art, the utility model aims at providing a cold light screen drive circuit and electronic cigarette based on high frequency boost to solve the problem that the transformer in the cold light screen drive circuit in the existing electronic cigarette is easy to produce howling and does not meet the demand of light and thin.

[0006] The technical scheme of the utility model is as follows:

[0007] The application discloses a cold light screen driving circuit based on high-frequency voltage boosting, which comprises a first voltage boosting module, a second voltage boosting module, a control module, a cold light screen control module and a cold light screen.

[0008] The first voltage boosting module comprises a first voltage boosting converter, a first electrolytic capacitor, a second electrolytic capacitor, a first inductor, a first diode, a first resistor and a second resistor.

[0009] The further setting of the utility model discloses, the second voltage increasing module includes: third resistance, first capacitance, first field effect tube, fourth resistance, fifth resistance, first transformer, second diode, third electrolytic capacitor, fourth electrolytic capacitor, sixth resistance and seventh resistance, wherein, one end of third resistance is connected with first voltage increasing module, the other end of first capacitance is connected with the drain of first field effect tube, the gate of first field effect tube is connected with the common connection end of one end of fourth resistance and one end of fifth resistance, the source of first field effect tube is grounded with the other end of fifth resistance, the other end of fourth resistance is connected with control module, the first foot of first transformer is connected with the other end of first capacitance and the drain of first field effect tube respectively, the second foot of first transformer is connected with first voltage increasing module, the sixth foot of first transformer is connected with the anode of second diode, the cathode of second diode, the anode of third electrolytic capacitor, the anode of fourth electrolytic capacitor and one end of sixth resistance are connected with cold light screen, the other end of sixth resistance and one end of seventh resistance are connected, the other end of seventh resistance, the cathode of third resistance, the eighth foot of first transformer and the cathode of fourth resistance are grounded.

[0010] The further setting of the utility model discloses, the second voltage increasing module includes: first three-pin inductor, third diode, second field effect tube, fifth electrolytic capacitor, sixth electrolytic capacitor, eighth resistance, ninth resistance, tenth resistance and eleventh resistance, wherein, the initial end of first three-pin inductor is connected with the output end of first voltage increasing module, the common end of first three-pin inductor is connected with the drain of second field effect tube, and the end of first three-pin inductor is connected with the anode of third diode, the gate of second field effect tube is connected with the common connection end of the first end of eighth resistance and one end of ninth resistance, the other end of eighth resistance is connected with control module, and the source of second field effect tube is grounded with the other end of ninth resistance, the common connection end of the cathode of third diode, fifth electrolytic capacitor, sixth electrolytic capacitor and tenth resistance is connected with cold light screen, the other end of tenth resistance and one end of eleventh resistance are connected, and the other end of eleventh resistance, the other end of fifth electrolytic capacitor and sixth electrolytic capacitor are grounded.

[0011] The further setting of the utility model discloses, the control module includes: micro control unit, wherein, the non-whistling signal transmission end of micro control unit is connected with second voltage increasing module, the control signal transmission end of micro control unit is connected with cold light screen control module respectively, and micro control unit generates frequency control signal as control signal.

[0012] The further setting of the utility model discloses, the cold light screen control module includes a plurality of cold light screen control units, the cold light screen control unit includes: twelfth resistance, thirteenth resistance and first triode, wherein, one end of the twelfth resistance is connected with the control module, the other end of the twelfth resistance is connected with one end of the thirteenth resistance, the base of the first triode is connected with the common connection end of the twelfth resistance, the thirteenth resistance, the emitter of the first triode is connected with the corresponding port of the cold light screen, the other end of the thirteenth resistance, the collector of the first triode is grounded.

[0013] The further setting of the utility model discloses, the first boost converter is DCDC boost chip.

[0014] The further setting of the utility model discloses, the micro control unit is 8 bit singlechip.

[0015] The further setting of the utility model discloses, the control module includes: micro control unit, wherein, the no howling signal transmission end of the micro control unit is connected with the second boost module, the control signal transmission end of the micro control unit is connected with the cold light screen control module respectively, the micro control unit generates carrier modulation signal as the control signal.

[0016] Based on the same utility model concept, the utility model still provides an electronic cigarette, it includes the cold light screen drive circuit based on high frequency boost as any one of the above technical schemes.

[0017] The utility model provides a kind of cold light screen drive circuit and electronic cigarette based on high frequency boost, it includes: first boost module, second boost module, control module, cold light screen control module and cold light screen, wherein: the output of the first boost module is connected with the input of second boost module, for boosting power voltage into first voltage;The output of the second boost module is connected with the cold light screen, for the high frequency boost to second voltage to the first voltage, and the second voltage is used to drive cold light screen;The input of the control module is connected with power voltage, the control module exports high frequency boost drive signal to the input of the second boost module, and exports cold light screen control signal to the input of the cold light screen control module, for the turn-on off of the cold light screen control module is controlled, and the high frequency boost frequency of the second boost module is controlled;The output of the cold light screen control module is connected with the cold light screen, for the bright-off control of each point of cold light screen.The utility model is boosted to power voltage by two-stage boost circuit high frequency, satisfy electronic cigarette circuit miniaturization and light and thin, and make that voltage frequency is higher than the frequency range that human ear can hear, by using higher than the voltage frequency that human ear can hear, avoid the howling of second boost module, improve the use experience of user. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0019] Figure 1 The utility model discloses a cold light screen drive circuit function module architecture diagram based on high frequency boost.

[0020] Figure 2 The utility model discloses a first boost module's circuit principle diagram of cold light screen drive circuit based on high frequency boost.

[0021] Figure 3 The utility model discloses a second boost module's circuit principle diagram of cold light screen drive circuit based on high frequency boost.

[0022] Figure 4 The utility model discloses a second boost module's circuit principle diagram of cold light screen drive circuit based on high frequency boost.

[0023] Figure 5 The utility model discloses a control module's circuit schematic diagram of cold light screen drive circuit based on high frequency boost.

[0024] Figure 6 The utility model discloses a cold light screen control module's circuit schematic diagram of cold light screen drive circuit based on high frequency boost.

[0025] Figure 7 The utility model discloses a cold light screen's circuit schematic diagram of cold light screen drive circuit based on high frequency boost. Specific implementation

[0026] The utility model provides a cold light screen drive circuit and electronic cigarette based on high frequency boost, in order to make the purpose, technical scheme and effect of the utility model more clear, definite, the following refers to the drawing and holds the example to the utility model further detailed explanation. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0027] In the embodiments and the claims, unless otherwise specified, "one", "an", "said" and "the" can also include plural forms. If the description of the embodiments of the present application involves "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0028] It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, "connection" or "coupling" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0029] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0030] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0031] Please also refer to Figures 1 to 6 The present application provides a preferred embodiment of a cold light screen driving circuit based on high-frequency voltage boosting.

[0032] Figure 1The application discloses a preferable embodiment of a cold light screen driving circuit based on high-frequency voltage boosting and an electronic cigarette, which comprises a first voltage boosting module 100, a second voltage boosting module 200, a control module 300, a cold light screen control module 400 and a cold light screen 500. The output end of the first voltage boosting module 100 is connected with the input end of the second voltage boosting module 200, and is used for boosting the power voltage to a first voltage. The output end of the second voltage boosting module 200 is connected with the cold light screen 500, and is used for boosting the first voltage to a second voltage at high frequency, and the second voltage is used for driving the cold light screen 500. The input end of the control module 300 is connected with the power voltage, the first output end of the control module 300 is connected with the input end of the second voltage boosting module 200, and the second output end of the control module 300 is connected with the input end of the cold light screen control module 400, which is used for controlling the turn-on and turn-off of the cold light screen control module 400 and the high-frequency voltage boosting frequency of the second voltage boosting module 200. Specifically, the high-frequency voltage boosting driving signal is a control frequency of 20KHz or above. The output end of the cold light screen control module 400 is connected with the cold light screen 500, and is used for outputting a control signal to control the light and dark of the cold light screen 500 at each position.

[0033] Specifically, the power voltage is a lithium battery working voltage, the output direct current voltage of the lithium battery in the electronic cigarette fluctuates between 3-4.2V, the lithium battery is connected with the power supply end of the control module 300 and the input end of the first voltage boosting module 100 respectively, which is used for ensuring the normal working of the control module 300 and providing the working voltage for the first voltage boosting module 100. When the power voltage in the circuit is detected to be greater than the working voltage, the first voltage boosting module 100 starts to work, samples the voltage output by the lithium battery and boosts the voltage to the first voltage. The control module 300 outputs a high-frequency voltage boosting driving signal to the second voltage boosting module 200, the input end of the second voltage boosting module 200 receives the first voltage and samples the high-frequency voltage boosting driving signal at the same time, boosts the first voltage at high frequency, and obtains the second voltage meeting the driving voltage and high-frequency requirement of the cold light screen 500. Meanwhile, the control module 300 outputs a cold light screen 500 control signal to the cold light screen control module 400, the cold light screen control module 400 is multiple and is connected with each control port of the cold light screen 500 respectively, controls the turn-on and turn-off according to the high and low levels of the cold light screen 500 control signal respectively, and drives the light and dark of the cold light screen 500. When the cold light screen control module 400 is turned on, the corresponding position of the cold light screen 500 is lighted. When the cold light screen control module 400 is turned off, the corresponding position of the cold light screen 500 is extinguished.

[0034] Please refer to Figure 2The first voltage boosting module 100 comprises a first voltage boosting converter U1, a first electrolytic capacitor E1, a second electrolytic capacitor E2, a first inductor L1, a first diode D1, a first resistor R1 and a second resistor R2. The voltage input end of the first voltage boosting converter U1 is connected to a power supply voltage. The feedback input ends of the first voltage boosting converter U1 are respectively connected to the common connection ends of the first resistor R1 and the second resistor R2. The switch output ends of the first voltage boosting converter U1 are respectively connected to one end of the first inductor L1 and the anode of the first diode D1. The anode of the first electrolytic capacitor E1 is connected to a second voltage boosting module 200. The cathode of the first electrolytic capacitor E1 is respectively connected to the other end of the second resistor R2 and a grounding point. The anode of the second electrolytic capacitor E2 is respectively connected to a power supply voltage and the other end of the first inductor L1. The cathode of the second electrolytic capacitor E2 is grounded. The cathode of the first diode D1 is respectively connected to the other end of the first resistor R1 and the anode of the first electrolytic capacitor E1.

[0035] Further, the first voltage boosting converter U1 is a DC-DC voltage boosting converter YX3608, which is used to realize BOOST voltage boosting. The voltage boosting converter YX3608 mainly integrates a PWM driving signal generator and a MOSFET switch tube inside. The switch output ends are respectively connected to one end of the first inductor L1 and the anode of the first diode D1, which are connected to the drain of the internal MOSFET switch tube and used to realize the switching action of the Boost circuit voltage boosting. The GND end is grounded. The feedback input ends FB are respectively connected to the common connection ends of the first resistor R1 and the second resistor R2. The FB voltage is 0.6V. The voltage regulator switch control input end is used to control the first voltage boosting converter U1 to enter a low-power consumption mode. The voltage input end VIN is connected to a power supply voltage. The first voltage boosting converter U1 is used to realize the driving signal generation and switch tube function in a conventional Boost circuit. The power supply voltage drives the first voltage boosting module 100 to work. At the same time, the power supply end is connected to the first inductor L1. The first voltage boosting module 100 is turned on and turned off at a preset PWM signal frequency. When the first voltage boosting module 100 is turned on, the current through the first inductor L1 increases. When the first voltage boosting module 100 is turned off, the current flows to the first capacitor through the first diode D1, stores the current from the first inductor L1, and the voltage of the output first capacitor increases after a plurality of switching periods, so as to realize voltage boosting. The first voltage is 12V after the voltage is boosted by the first voltage boosting module 100, and is output at the output end 12VDD of the first voltage boosting module 100.

[0036] Figure 3In a further implementation form of the preferred embodiment of the utility model, the second voltage boosting module 200 comprises: a third resistor R3, a first capacitor, a first field effect transistor Q1, a fourth resistor R4, a fifth resistor R5, a first transformer, a second diode D2, a third electrolytic capacitor E3, a fourth electrolytic capacitor E4, a sixth resistor R6 and a seventh resistor R7, wherein one end of the third resistor R3 is connected with the first voltage boosting module 100, and the other end of the third resistor R3 is connected with one end of the first capacitor; the other end of the first capacitor is connected with the drain of the first field effect transistor Q1; the gate of the first field effect transistor Q1 is connected with the common connection end of the fourth resistor R4 and the fifth resistor R5, and the source of the first field effect transistor Q1 is connected with the other end of the fifth resistor R5 and the ground; the other end of the fourth resistor R4 is connected with the control module 300; the first foot of the first transformer is connected with the common connection end of the first capacitor and the drain of the first field effect transistor Q1, the second foot of the first transformer is connected with the first voltage boosting module 100, the sixth foot of the first transformer is connected with the anode of the second diode D2, and the eighth foot of the first transformer is grounded; the cathode of the second diode D2, the anode of the third electrolytic capacitor E3, the anode of the fourth electrolytic capacitor E4 and one end of the sixth resistor R6 are connected with the cold light screen 500; the other end of the sixth resistor R6 and one end of the seventh resistor R7 are connected, and the other end of the seventh resistor R7, the cathode of the third resistor R3 and the cathode of the fourth resistor R4 are grounded.

[0037] Specifically, the input end of the second voltage boosting module 200 receives a first voltage. The gate of the first field effect transistor Q1 is connected with the control module 300 through the fourth resistor R4, for receiving a high-frequency voltage boosting driving signal, which is preferably a PWM signal, and the frequency of the high-frequency voltage boosting driving signal is greater than 20KHz, for controlling the turn-on and turn-off of the first field effect transistor Q1. When the high-frequency voltage boosting driving signal is at a high level, the first field effect transistor Q1 is turned on, and there is current passing through the primary coil; when the high-frequency voltage boosting driving signal is at a low level, the first field effect transistor Q1 is turned off, and there is no current passing through the primary coil, thereby controlling the working state of the transformer, and the frequency of the output voltage is the same as that of the high-frequency voltage boosting driving signal, so that the frequency of the output voltage is also greater than 20KHz. The second diode D2 is used for isolating the subsequent circuit and reducing the loss generated by the turn-on of the first field effect transistor Q1. The turns ratio of the primary coil and the secondary coil of the transformer is about 1:9, so that the subsequent voltage EL_H_VDD is 12*9=108V, and the subsequent voltage EL_H_VDD is regarded as a second voltage.

[0038] Further, as Figure 4The utility model discloses still provided another embodiment of the second boost module 200 in the cold light screen drive circuit based on high frequency boost, the second boost module 200 includes: first three pin inductance, third diode D3, second field effect tube Q2, fifth electrolytic capacitor E5, sixth electrolytic capacitor E6, eighth resistance R8, ninth resistance R9, tenth resistance R10 and eleventh resistance R11, wherein, the first three pin inductance L2's starting end is connected with the output of the first boost module 100, the common end of the first three pin inductance L2 is connected with the drain of the second field effect tube Q2, and the end of the first three pin inductance L2 is connected with the positive pole of the third diode D3, the grid of the second field effect tube Q2 is connected with the common connection end of the eighth resistance R8 and ninth resistance R9, and the other end of the eighth resistance R8 is connected with the control module 300, and the source of the second field effect tube Q2 is grounded with the other end of the ninth resistance R9, the negative pole of the third diode D3, the fifth electrolytic capacitor E5, the sixth electrolytic capacitor E6, the common connection end of the tenth resistance are connected with the cold light screen 500, the other end of the tenth resistance R10 and the one end of the eleventh resistance R11 are connected, and the other end of the eleventh resistance R11, the other end of the fifth electrolytic capacitor E5 and the sixth electrolytic capacitor E6 are grounded.

[0039] Specifically, in the above embodiment, the starting end and the common end of the first three pin inductance L2 are the primary coil, the common end and the end of the first three pin inductance L2 are the secondary coil, the turns ratio between the primary coil and the secondary coil is 1:9, and the first three pin inductance L2 realizes self-coupling boost. The second field effect tube Q2 receives a high-frequency boost driving signal at the gate, when the gate of the second field effect tube Q2 is high, the common end of the first three pin inductance L2 is grounded, when the gate of the second field effect tube Q2 is low, the common end of the first three pin inductance L2 is disconnected, thereby obtaining a high-voltage high-frequency oscillation signal output at the back end of the second boost module 200, and the third diode D3 is used for isolating the back-end circuit and reducing the loss generated by the conduction of the second field effect tube Q2. Overcome the low boost efficiency of the three-pin inductance in the prior art and the problem of low brightness of the cold light screen 500.

[0040] By the technical scheme, the utility model discloses two-stage voltage boosting, relative to using one-stage transformer to boost, reduces the coil turns number in transformer inside while guaranteeing that the voltage boosting effect is basically unchanged, reduces the overall size of voltage boosting module, and guarantees that the frequency of output second voltage is same with high-frequency voltage boosting drive signal. Therefore, when the frequency of high-frequency voltage boosting drive signal is higher than 20KHZ, the voltage frequency in second voltage boosting module 200 is higher than the frequency range that human ear can hear, and by using the voltage frequency that human ear can hear, the howling of second voltage boosting module 200 is avoided, and the use experience of user is improved.

[0041] Further, please refer to Figure 5 The control module 300 includes: micro control unit U2, wherein the whistle-free signal transmission end of the micro control unit U2 is connected to the second voltage boosting module 200, and the control signal transmission end of the micro control unit U2 is connected to the cold light screen control module 400 respectively. The micro control unit U2 is SC8F6796AD828NPR, the eighth port of the micro control unit U2 is connected to the input end EL_PWM_N of the second voltage boosting module 200, and is used to output high voltage boosting drive signal to the second voltage boosting module 200. Meanwhile, the micro control unit U2 is used as the driving IC chip of the cold light screen 500, wherein the ninth port to the nineteenth port and the twenty-first port are connected to the input end of each cold light screen 500 module, the micro control unit U2 generates frequency control signal as the control signal, the frequency control signal is the IO port of the micro control unit U2, and the frequency control signal is 1.5KHz frequency, and the cold light screen 500 is driven to be bright or dark by controlling the conduction and the shutdown of each cold light screen control module 400.

[0042] Further, the micro control unit can also generate carrier modulation signal as the control signal, and the carrier modulation signal is obtained by loading the preset modulation wave to the control frequency. That is, the micro control unit U2 can also use the internal timer to control the output of a low-frequency modulation wave, and uses 1.5KHz frequency as the carrier, so as to realize the carrier modulation of the cold light screen 500 control signal. The control wave frequency is preferably 100Hz, the conduction and the shutdown of the control carrier are realized by controlling the high-low level change of 100HZ, the cold light screen 500 is controlled to be bright or dark, and the cold light screen 500 can be controlled by the duty ratio of 100HZ, and also can control the display brightness of the cold light screen by controlling the carrier frequency.

[0043] Further, please refer to Figure 6 And Figure 7The cold light screen control module 400 comprises a plurality of cold light screen control units 410, the cold light screen control units 410 are identical in structure, and the cold light screen control unit 410 comprises a twelfth resistor R12, a thirteenth resistor R13 and a first triode Q3. One end of the twelfth resistor R12 is connected to the control module 300, the other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13, the base of the first triode Q3 is connected to the common connection end of the twelfth resistor R12 and the thirteenth resistor R13, the emitter of the first triode Q3 is connected to the corresponding port of the cold light screen 500, and the other end of the thirteenth resistor R13 and the collector of the first triode Q3 are grounded. In the cold light screen control module 400, the input port EL_CON(2-14) of each cold light screen control unit 410 is connected to the IO port of the micro control unit U2 to receive a cold light screen 500 control signal with a frequency of 1.5KHz. Figure 6 Taking the cold light screen control unit 410 at the second port of the cold light screen 500 as an example, the EL_CON2 end of the cold light screen control unit 410 is connected to the control signal transmission end of the control module 300, and the EL_N2 end of the cold light screen control unit 410 is connected to the corresponding port of the cold light screen 500. When the cold light screen 500 control signal at the input end EL_CON2 is high, the base of the third field effect tube is divided into high by the twelfth resistor R12, the third diode D3 is turned on, and the second port of the cold light screen 500 is grounded. When the cold light screen 500 control signal at the input end EL_CON2 is low, the third diode D3 is cut off, and the second port of the cold light screen 500 is disconnected, so that the cold light screen 500 is driven to display by a frequency signal of 1.5KHZ.

[0044] Further, the electrical connection relationship at each port of the cold light screen 500 is as shown in Figure 7 The control voltage of the cold light screen 500 in the normal working state is high voltage 110V, the control frequency is 50-5KHz, and the second voltage obtained after the voltage of the second voltage boosting module 200 is boosted is 110V and the frequency is 20KHz, which is much larger than the control frequency threshold of the cold light screen 500. Therefore, the EL_N2 to EL_N14 ports of the cold light screen 500 are respectively connected to the output ends of the cold light screen control units 410, a frequency signal of 1.5KHZ is introduced to individually control the conduction and turn-off of the 110V second voltage, so as to drive the cold light screen 500 to display.

[0045] The utility model provides a cold light screen drive circuit and electronic cigarette based on high frequency voltage rising, its beneficial effect lies in: through two -stage voltage increasing circuit to power voltage carries out high frequency voltage rising, satisfies electronic cigarette circuit miniaturization and light and thin, and make voltage frequency higher than the frequency range that human ear can hear, through adoption higher than the voltage frequency that human ear can hear, avoid the howling of second voltage increasing module. Meanwhile, adopt the cold light screen control signal individual control second voltage's conduction and cut -off, and then individual control cold light screen lighting and extinguishing. Through input respectively the drive voltage after voltage rising and the drive frequency at each port, avoid the howler of voltage ware, satisfy the control frequency requirement of cold light screen, optimize the voltage -raising efficiency of portable electronic cigarette, improve user's use experience.

[0046] It should be understood that the application of the utility model is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the utility model claims.

Claims

1. A cold light screen driving circuit based on high frequency voltage boosting, characterized by, The application relates to a cold light screen control system, which comprises a first voltage-boosting module, a second voltage-boosting module, a control module, a cold light screen control module and a cold light screen. The output end of the first voltage-boosting module is connected with the input end of the second voltage-boosting module, and the power voltage is boosted to a first voltage. The output end of the second voltage-boosting module is connected with the cold light screen, and the first voltage is boosted to a second voltage, and the second voltage is used for driving the cold light screen. The input end of the control module is connected with the power voltage, the control module outputs a high-frequency voltage driving signal to the input end of the second voltage-boosting module and outputs a cold light screen control signal to the input end of the cold light screen control module, which is used for controlling the on-off of the cold light screen control module and controlling the high-frequency voltage frequency of the second voltage-boosting module, and the high-frequency voltage driving signal is a control frequency of 20KHz or above. The output end of the cold light screen control module is connected with the cold light screen, and a control signal is outputted to control the light-off of each position of the cold light screen. The first voltage-boosting module comprises a first voltage-boosting converter, a first electrolytic capacitor, a second electrolytic capacitor, a first inductor, a first diode, a first resistor and a second resistor.

2. The cold cathode fluorescent lamp driving circuit based on high frequency voltage boosting according to claim 1, wherein The voltage input end of the first voltage-boosting converter is connected with the power voltage, the feedback input end of the first voltage-boosting converter is connected with one end of the first resistor and one end of the second resistor respectively, the switch output end of the first voltage-boosting converter is connected with one end of the first inductor and the positive pole of the first diode respectively, the positive pole of the first electrolytic capacitor is connected with the second voltage-boosting module, the negative pole of the first electrolytic capacitor is grounded through the other end of the second resistor, the positive pole of the second electrolytic capacitor is connected with the power voltage and the other end of the first inductor respectively, the negative pole of the second electrolytic capacitor is grounded, and the negative pole of the first diode is connected with the other end of the first resistor and the positive pole of the first electrolytic capacitor. The second voltage-boosting module comprises a third resistor, a first capacitor, a first field effect tube, a fourth resistor, a fifth resistor, a first transformer, a second diode, a third electrolytic capacitor, a fourth electrolytic capacitor, a sixth resistor and a seventh resistor.

3. The cold cathode fluorescent lamp driving circuit based on high frequency voltage boosting according to claim 1, wherein ​ One end of the third resistor is connected with the first voltage boosting module, and the other end of the third resistor is connected with one end of the first capacitor; the other end of the first capacitor is connected with the drain of the first field effect tube; the gate of the first field effect tube is connected with the common connection end of one end of the fourth resistor and one end of the fifth resistor, and the source of the first field effect tube is grounded through the other end of the fifth resistor; the other end of the fourth resistor is connected with the control module; the first foot of the first transformer is connected with the other end of the first capacitor and the drain of the first field effect tube respectively, the second foot of the first transformer is connected with the first voltage boosting module, and the sixth foot of the first transformer is connected with the anode of the second diode; the cathode of the second diode, the anode of the third electrolytic capacitor, the anode of the fourth electrolytic capacitor and one end of the sixth resistor are connected with the cold light screen, the other end of the sixth resistor and one end of the seventh resistor are connected, the other end of the seventh resistor, the negative electrode of the third resistor, the eighth foot of the first transformer and the negative electrode of the fourth resistor are grounded.

4. The cold cathode fluorescent lamp driving circuit according to claim 1, wherein The second voltage boosting module comprises a first three-pin inductor, a third diode, a second field effect tube, a fifth electrolytic capacitor, a sixth electrolytic capacitor, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor, wherein, The starting end of the first three-pin inductor is connected with the output end of the first voltage boosting module, the common end of the first three-pin inductor is connected with the drain of the second field effect tube, and the ending end of the first three-pin inductor is connected with the anode of the third diode; the gate of the second field effect tube is connected with the common connection end of the first end of the eighth resistor and one end of the ninth resistor, the other end of the eighth resistor is connected with the control module, and the source of the second field effect tube is grounded through the other end of the ninth resistor; the common connection end of the negative electrode of the third diode, the fifth electrolytic capacitor, the sixth electrolytic capacitor and the tenth resistor is connected with the cold light screen, the other end of the tenth resistor and one end of the eleventh resistor are connected, and the other end of the eleventh resistor, the other end of the fifth electrolytic capacitor and the other end of the sixth electrolytic capacitor are grounded.

5. The cold cathode fluorescent lamp driving circuit according to claim 1, wherein The control module comprises a micro control unit, wherein, The non-whistling signal transmission end of the micro control unit is connected with the second voltage boosting module, the control signal transmission end of the micro control unit is connected with the cold light screen control module respectively, and the micro control unit generates a frequency control signal as the control signal.

6. The cold cathode fluorescent lamp driving circuit according to claim 5, wherein The cold light screen control module comprises a plurality of cold light screen control units, and each cold light screen control unit comprises a twelfth resistor, a thirteenth resistor and a first triode, wherein, One end of the twelfth resistor is connected with the control module, the other end of the twelfth resistor is connected with one end of the thirteenth resistor, the base of the first triode is connected with the common connection end of the twelfth resistor and the thirteenth resistor, the emitter of the first triode is connected with the corresponding port of the cold light screen, and the other end of the thirteenth resistor and the collector of the first triode are grounded.

7. The cold cathode fluorescent lamp driving circuit according to claim 2, wherein The first voltage boosting converter is a DCDC voltage boosting chip.

8. The cold cathode fluorescent lamp driving circuit according to claim 5, wherein The micro-control unit is an 8-bit single-chip microcomputer.

9. The cold cathode fluorescent lamp driving circuit according to claim 3, wherein The control module comprises a micro-control unit, The non-whistling signal transmission end of the micro-control unit is connected with the second voltage boosting module, the control signal transmission end of the micro-control unit is respectively connected with the cold light screen control module, and the micro-control unit generates a carrier modulation signal as the control signal.

10. An electronic cigarette, characterized in that, The cold light screen driving circuit based on high-frequency voltage boosting comprises the cold light screen driving circuit based on high-frequency voltage boosting according to any one of claims 1-9.

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