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EP-3854240-B1 - VOLTAGE OUTPUT CIRCUIT AND ELECTRONIC CIGARETTE

EP3854240B1EP 3854240 B1EP3854240 B1EP 3854240B1EP-3854240-B1

Inventors

  • QIU, WEIHUA
  • LIU, KUI

Dates

Publication Date
20260506
Application Date
20190917

Claims (10)

  1. A voltage output circuit, wherein the voltage output circuit comprises: a control chip (U6), the control chip (U6) comprises a first control signal input terminal (20), a second control signal input terminal (21), and a modulation signal output terminal (23), the first control signal input terminal (20) is connected to a first control signal output terminal (24) of a suction detection element (J3), the second control signal input terminal (21) is connected to a second control signal output terminal (37) of a touch sensing chip (U8), a touch input pin (25) of the touch sensing chip (U8) is connected to a touch panel; a buck switch chip (U2), the buck switch chip (U2) comprises a first channel terminal (26), a first control terminal (27), and a second channel terminal (28), the first channel terminal (26) of the buck switch chip (U2) is configured to receive a system power supply voltage, the first control terminal (27) of the buck switch chip (U2) is connected to the modulation signal output terminal (23) of the control chip (U6); when the first control signal input terminal (20) receives an effective level and the second control signal input terminal (21) receives an effective level, the modulation signal output terminal (23) of the control chip (U6) is configured to output a pulse width modulation signal to the first control terminal (27) of the buck switch chip (U2); when the first control terminal (27) of the buck switch chip (U2) receives a pulse width modulation signal of an effective level, the first channel terminal (26) and the second channel terminal (28) are controlled to be conducted, and the second channel terminal (28) is configured to output a driving voltage with a voltage value thereof being less than a voltage value of the system power supply voltage; the second channel terminal (28) of the buck switch chip (U2) is connected to a heating wire to output the driving voltage to drive the heating wire to generate heat; the control chip (U6) further comprises a second enable signal output terminal (34), a first current receiving terminal (35), and a second current receiving terminal (36), the voltage output circuit further comprises a resistance detection circuit (110), the second enable signal output terminal (34) of the control chip (U6) is connected to the resistance detection circuit (110); the resistance detection circuit (110) comprises a sixth current limiting resistor (R23), a seventh current limiting resistor (R22), a first detection resistor (R18), a second detection resistor (R21), a third detection resistor (R20), a fifth filter capacitor (C25), a sixth filter capacitor (C24), and a third switching element (Q5); a fifth channel terminal (38) of the third switching element (Q5) is configured to receive the system power supply voltage and is connected to the second enable signal output terminal (34) of the control chip (U6) through the sixth current limiting resistor (R23); a third control terminal (40) of the third switching element (Q5) is connected to the second enable signal output terminal (34) of the control chip (U6) through the seventh current limiting resistor (R22); a sixth channel terminal (39) of the third switching element (Q5) is connected to the second channel terminal (28) of the buck switch chip (U2) through the first detection resistor (R18); one end of the second detection resistor (R21) is grounded through the fifth filter capacitor (C25) and is connected to the first current receiving terminal (35) of the control chip (U6), the other end of the second detection resistor (R21) is connected to the second channel terminal (28) of the buck switch chip (U2); one end of the third detection resistor (R20) is grounded through the sixth filter capacitor (C24) and is connected to the second current receiving terminal (36) of the control chip (U6), the other end of the third detection resistor (R20) is connected to the sixth channel terminal (39) of the third switching element (Q5).
  2. The voltage output circuit according to claim 1, wherein a first enable signal output terminal (29) of the control chip (U6) is electrically connected to a second control terminal (30) of a second switching element (Q11), a third channel terminal (19) of the second switching element (Q11) is grounded, a fourth channel terminal (18) of the second switching element (Q11) is electrically connected to a negative electrode of a motor, and a positive electrode of the motor receives the system power supply voltage; when the second control signal input terminal (21) receives an effective level, the second switching element (Q11) is configured to control the third channel terminal (19) and the fourth channel terminal (18) to be conducted according to an enable signal provided by the first enable signal output terminal (29) of the control chip (U6), so that the motor is energized to work.
  3. The voltage output circuit according to claim 1, wherein the first control signal input terminal (20) of the control chip (U6) is electrically connected to the first control signal output terminal (24) of the suction detection element (J3) through a first current limiting resistor (R5); and/or, the second control signal input terminal (21) of the control chip (U6) is connected to the second control signal output terminal (37) of the touch sensing chip (U8) through a second current limiting resistor (R11); and/or, the first channel terminal (26) of the buck switch chip (U2) is connected to the modulation signal output terminal (23) of the control chip (U6) through a third current limiting resistor (R10); and/or, the first control signal output terminal (24) of the suction detection element (J3) is grounded through a fourth current limiting resistor (R8).
  4. The voltage output circuit according to claim 1 or 3, wherein a first power receiving terminal (32) of the control chip (U6) is grounded through a first filter capacitor (C2) and is configured to receive the system power supply voltage through a fifth current limiting resistor (R14); and/or, the first channel terminal (26) of the buck switch chip (U2) is further grounded through a second filter capacitor (C3); and/or, the touch input pin (25) of the touch sensing chip (U8) is further grounded through a third filter capacitor (C6); and/or, a second power input terminal (33) of the touch sensing chip (U8) is configured to receive the system power supply voltage and is grounded through a fourth filter capacitor (C7).
  5. The voltage output circuit according to claim 1, wherein the control chip (U6) further comprises at least one indicator control terminal, and each indicator control terminal is connected to an indicating circuit (200); the indicating circuit (200) comprises at least one eighth current limiting resistor (R17) and at least one light-emitting diode (D4), the cathode of each light-emitting diode (D4) is connected to an indicator control terminal of the control chip (U6) through an eighth current limiting resistor (R17), the anode of each light-emitting diode (D4) is configured to receive the system power supply voltage.
  6. The voltage output circuit according to claim 1, wherein the voltage output circuit further comprises the touch sensing chip (U8) and/or the suction detection element (J3).
  7. An electronic cigarette comprising the voltage output circuit according to any one of claims 1 to 6.
  8. The electronic cigarette according to claim 7, wherein the electronic cigarette further comprises a rechargeable battery, the rechargeable battery is used to provide the system power supply voltage.
  9. The electronic cigarette according to claim 7, wherein the electronic cigarette further comprises a charging circuit (300), the charging circuit (300) comprises a connector (J2) and a charging chip (U4); the charging chip (U4) comprises a second power receiving terminal (41) and a charging voltage output terminal (42), the second power receiving terminal (41) is connected to an external power source through the connector (J2), the charging voltage output terminal (42) is used to output a charging voltage to the positive electrode of the rechargeable battery.
  10. The electronic cigarette according to claim 9, wherein the charging circuit (300) further comprises a battery protection chip (U1), the battery protection chip (U1) comprises a third power receiving terminal (51), a ground terminal (52), a heat sink terminal (53), and a charging detection terminal (54); the third power receiving terminal (51) of the battery protection chip (U1) is connected to the positive electrode of the rechargeable battery, the ground terminal (52) of the battery protection chip (U1) is connected to the negative electrode of the rechargeable battery, the heat sink terminal (53) of the battery protection chip (U1) is connected to the ground terminal (52) of the battery protection chip (U1), the charging detection terminal (54) of the battery protection chip (U1) is grounded.

Description

TECHNICAL FIELD The present invention relates to the technical field of electronic equipment, and more particularly, relates to a voltage output circuit and an electronic cigarette. BACKGROUND As a substitute for cigarettes, electronic cigarettes are becoming more and more popular in the market due to their safety, convenience, health, and environmental protection to a certain extent. At present, e-cigarettes usually only provide a single sensor or button for users to light up the cigarette, and the way of lighting the e-cigarette is single. Documents WO2018001910A1 discloses an aerosol-generating system which includes one or more electric aerosol-generating elements, one or more hybrid capacitors for supplying power to the one or more electric aerosol-generating elements, and a voltage source for supplying power to the one or more hybrid capacitors to charge the one or more hybrid capacitors. Documents CN205390304U discloses a lip auto-sensing smoking e-cigarette, including an atomizer and a control circuit board, wherein the atomizer is provided with a lip sensing switch connected with a touch IC. When the lip touches the lip sensing switch, a touch-sensitive signal is generated by the lip sensing switch, and the touch IC triggers automatic smoking based on the touch-sensitive signal. Document CN 105 876 869 A is another example of prior art. SUMMARY In order to solve the problem of the single lighting method of electronic cigarettes in the prior art, the present disclosure provides a voltage output circuit and an electronic cigarette as set out in the appended set of claims. The beneficial effects brought about by the technical solutions provided by the embodiments of the present disclosure are: By providing a voltage output circuit, the voltage output circuit includes a control chip U6 and a buck switch chip U2. The control chip U6 includes a first control signal input terminal 20, a second control signal input terminal 21, and a modulation signal output terminal 23. The first control signal input terminal 20 is electrically connected to the first control signal output terminal 24 of the suction detection element J3. The second control signal input terminal 21 is connected to the second control signal output terminal 37 of the touch sensing chip U8. The touch input pin 25 of the touch sensing chip U8 is connected to the touch panel. The buck switch chip U2 includes a first channel terminal 26, a first control terminal 27, and a second channel terminal 28. The first channel terminal 26 of the buck switch chip U2 receives a system power supply voltage VCC_BAT. The first control terminal 27 of the buck switch chip U2 is connected to the modulation signal output terminal 23 of the control chip U6. When the suction detection element J3 detects a suction signal and/or the touch sensing chip U8 receives a touch signal, the control chip U6 uses its modulation signal output terminal 23 to output a pulse width modulation signal to the buck switch chip U2, so that the buck switch chip U2 realizes voltage reduction according to the pulse width modulation signal and outputs a driving voltage VOUT with a voltage value thereof being less than the voltage value of the system power supply voltage VCC_BAT to the load such as the heating wire, so as to provide users with a variety of cigarette lighting methods. In this way, the problem of the single lighting method of electronic cigarettes in the related art is solved, and the effect of varying the lighting methods of electronic cigarettes is achieved. BRIEF DESCRIPTION OF THE DRAWINGS In order to explain the technical solutions in the embodiments of the present disclosure more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some implementations of the present utility model. For example, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings. FIG. 1A is a schematic diagram of a voltage output circuit provided by the first embodiment of the present invention;FIG. 1B is an enlarged view of the portion 1B in FIG. 1A;FIG. 1C is an enlarged view of the portion 1C in FIG. 1A;FIG. 2A is a schematic diagram of a voltage output circuit provided by the second embodiment of the present invention;FIG. 2B is an enlarged view of the portion 2B in FIG. 2A;FIG. 2C is an enlarged view of the portion 2C in FIG. 2A;FIG. 2D is an enlarged view of the portion 2D in FIG. 2A;FIG. 2E is an enlarged view of the portion 2E in FIG. 2A;FIG. 3 is a schematic diagram of a motor connection provided by an embodiment of the present invention;FIG. 4 is a schematic diagram of an indicating circuit provided by an embodiment of the present invention;FIG. 5A is a schematic diagram of a charging circuit provided by an embodiment of the present invention;FIG. 5B is an enlarged view of the portion 5B in FIG. 5A;FIG. 5C