Smoking set control circuit and smoking set

Patent metadata

Field	Value
Publication number	US-12575604-B2
Application number	US-202117792135-A
Country	US
Kind code	B2
Filing date	Jan 10, 2021
Priority date	Jan 11, 2020
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

A smoking set control circuit for a smoking set includes: a power circuit first and second sampling circuits; a voltage regulating circuit having power tubes; a microcontroller configured to: control the power tubes to work at a plurality of different preset switching frequencies; acquire first electrical parameters and second electrical parameters at different preset switching frequencies, and accordingly determine corresponding efficiencies of the voltage regulating circuit at different preset switching frequencies; control the power tube to take the preset switching frequency corresponding to the highest efficiency among the corresponding efficiencies as the working frequency. A loss of the voltage regulating circuit is reduced and a utilization rate of power supply is improved by acquiring the electrical parameters at different preset switching frequencies, determining corresponding efficiencies of the voltage regulating circuit, and controlling the power tube to take the preset switching frequency corresponding to the highest efficiency as the working frequency.

First claim

What is claimed is:

1 . A smoking set control circuit, comprising a power circuit, a sampling circuit, a voltage regulating circuit and a microcontroller; wherein the sampling circuit comprises
a first sampling circuit and a second sampling circuit;
the first sampling circuit being configured to sample first electrical parameters at a front end of the voltage regulating circuit;
the voltage regulating circuit comprising power transistors;
the second sampling circuit being configured to sample second electrical parameters at a back end of the voltage regulating circuit;
the first electrical parameters and the second electrical parameters comprise current and voltage;
each of the first sampling circuit and the second sampling circuit comprises a first sampling electrical connection terminal, a second sampling electrical connection terminal, a sampling resistor and an operational amplifier, and a voltage dividing circuit electrically connected with the second sampling electrical connection terminal;
the sampling resistor is connected between the first sampling electrical connection terminal and the second sampling electrical connection terminal;
the operational amplifier is configured to amplify and convert the voltage difference between two ends of the sampling resistor and output a sampling current;
the voltage dividing circuit is configured to divide the voltage of the second sampling electrical connection terminal and output a sampling voltage;
the microcontroller being configured to:
control the power transistors to work at a plurality of different preset switching frequencies;
acquire the first electrical parameters and the second electrical parameters at different preset switching frequencies, and accordingly determine corresponding efficiencies of the voltage regulating circuit at different preset switching frequencies;
control the power transistors to take the preset switching frequency corresponding to the highest efficiency among the corresponding efficiencies as the working frequency.

2 . The smoking set control circuit according to claim 1 , wherein the first sampling circuit and the second sampling circuit further comprise a filter circuit;
the filter circuit is electrically connected with an output terminal of the operational amplifier, and is configured to filter the sampling current output by the operational amplifier.

3 . The smoking set control circuit according to claim 1 , wherein the voltage dividing circuit comprises a first resistor and a second resistor electrically connected in series, and a first capacitor electrically connected at both ends of the second resistor in parallel.

4 . The smoking set control circuit according to claim 1 , wherein the voltage regulating circuit comprises a switch circuit, a power supply circuit, a driving circuit and a boost circuit;
the switch circuit has an input terminal electrically connected with the power circuit, an output terminal electrically connected with a power input terminal of the power supply circuit, and a control terminal for receiving a second control signal output by the microcontroller; the second control signal is configured to control the on and off of the switch circuit; the power supply circuit has a power output terminal electrically connected with a power terminal of the driving circuit; the power supply circuit is configured to supply power to the driving circuit; the driving circuit has a signal input terminal for receiving a driving signal provided by the microcontroller, and a signal output terminal which outputs a driving control signal for driving and controlling the power transistors; a signal control terminal for receiving a third control signal output by the microcontroller; and the third control signal is configured to control the on and off of the boost circuit; the boost circuit is provided with the power transistors; the boost circuit has a power input terminal electrically connected with the power circuit, a power output terminal electrically connected with a heater, a signal receiving terminal for receiving the driving control signal.

5 . The smoking set control circuit according to claim 4 , wherein the boost circuit comprises a first switch, a second switch, a charging circuit, a first power transistor and a second power transistor;
the first switch has an input terminal electrically connected with the power circuit and an output terminal electrically connected with one end of the charging circuit, the other end of the charging circuit is electrically connected with an input terminal of the first power transistor and an input terminal of the second power transistor, and a control terminal of the first switch is electrically connected with an input terminal of the second switch; the second switch has an output terminal grounded and a control terminal for receiving the third control signal; the third control signal is configured to control the on and off of the second switch, thereby controlling the on and off of the first switch; the first power transistor has an output terminal grounded and a control terminal for receiving the first driving control signal output by the driving circuit; the second power transistor has an output terminal electrically connected with the heater, and a control terminal for receiving the second driving control signal output by the driving circuit.

6 . The smoking set control circuit according to claim 5 , wherein the charging circuit comprises an inductor.

7 . The smoking set control circuit according to claim 5 , wherein the first switch is a PMOS transistor, and the second switch, the first power transistor and the second power transistor are all NMOS transistors.

8 . The smoking set control circuit according to claim 5 , wherein the boost circuit further comprises a filter circuit which is electrically connected between the output terminal of the second power transistor and the heater.

9 . The smoking set control circuit according to claim 4 , wherein the switch circuit comprises a third switch and a fourth switch;
the third switch has an input terminal electrically connected with the power circuit, an output terminal electrically connected with the power supply circuit, and a control terminal electrically connected with an input terminal of the fourth switch; the fourth switch has an output terminal grounded and a control terminal for receiving the second control signal; the second control signal is configured to control the on and off of the fourth switch, thereby controlling the on and off of the third switch.

10 . The smoking set control circuit according to claim 9 , wherein the third switch is a PMOS transistor, and the fourth switch is an NMOS transistor.

11 . A smoking set, comprising a heater and the smoking set control circuit according to claim 1 .

Assignees

• Shenzhen First Union Tech Co

Inventors

• Li Wenjuan
• Fang Xiaogang
• Yu Peixia
• Xu Zhongli
• Li Yonghai

Classifications

• H02J2105/44

  Portable electronic devices · CPC title

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title

• H02M1/0054

  Transistor switching losses (periodically suspending operation of switching converter in low power mode H02M1/0035) · CPC title

• H02M3/156

  with automatic control of output voltage or current, e.g. switching regulators · CPC title

• A24F40/57 Primary

  Temperature control · CPC title