CN219023001U

CN219023001U - Control circuit for radio frequency beauty instrument

Info

Publication number: CN219023001U
Application number: CN202221856701.1U
Authority: CN
Inventors: 王付顺; 高红章
Original assignee: Henan Miao Electronic Technology Co ltd
Current assignee: Henan Miao Electronic Technology Co ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2023-05-16
Anticipated expiration: 2032-07-19

Abstract

The utility model discloses a control circuit for a radio frequency beauty instrument, and relates to the technical field of circuit control. The circuit comprises an MCU microprocessor, an RF conversion and output circuit, an RF radio frequency current and temperature control circuit, a USB charging and lithium battery control circuit, a DC-DC direct current control circuit, a triaxial gravity sensing control circuit, a buzzer prompt circuit, an LED display circuit and a key detection circuit; MCU microprocessor: the device is used for controlling the work of an RF conversion and output circuit, an RF radio frequency current and temperature control circuit, a USB charging and lithium battery control circuit, a DC-DC direct current control circuit, a triaxial gravity sensing control circuit, a buzzer prompt circuit, an LED display circuit and a key detection circuit. The utility model is improved by adding the triaxial gravity induction control circuit to induce the operation gesture of a user of the cosmetic instrument and control the intensity of the radio frequency power by the movement frequency, so that the control is sensitive and the energy loss of a battery is reduced.

Description

Control circuit for radio frequency beauty instrument

Technical Field

The utility model belongs to the technical field of circuit control, and particularly relates to a control circuit for a radio frequency beauty instrument.

Background

Along with the improvement of living standard, people pay more attention to health care and beauty, the beauty treatment becomes the rigidity demand, the beauty treatment instrument is a machine which adjusts and improves the body and the face according to the physiological function of a human body, the functions of the beauty treatment instrument are mainly divided into a plurality of types of whitening, skin tendering, freckle removing, wrinkle removing, dehairing, face wrinkle removing and the like, the power control of the current application to the household radio frequency beauty treatment instrument is single, and the skin burn and the energy loss are easy to cause in the using process, so the control circuit for the radio frequency beauty treatment instrument is designed.

Disclosure of Invention

The present utility model is directed to a control circuit for a radio frequency cosmetic instrument, so as to solve the problems set forth in the background art.

In order to solve the technical problems, the utility model is realized by the following technical scheme: the control circuit for the radio frequency beauty instrument consists of an MCU microprocessor, an RF conversion and output circuit, an RF radio frequency current and temperature control circuit, a USB charging and lithium battery control circuit, a DC-DC direct current control circuit, a triaxial gravity sensing control circuit, a buzzer prompt circuit, an LED display circuit and a key detection circuit;

the MCU microprocessor: the device is used for controlling the work of the RF conversion and output circuit, the RF radio frequency current and temperature control circuit, the USB charging and lithium battery control circuit, the DC-DC direct current control circuit, the triaxial gravity sensing control circuit, the buzzer prompt circuit, the LED display circuit and the key detection circuit.

Further,

pins

9, 10 and 11 of the MCU microprocessor are respectively connected with pins 2[ RF1_M ], 4[ RF2_M ] and 1[ RF_EN ] of U2 of the RF conversion and output circuit, pin 7 of U2 is connected with a gate of Q1, pin 5 of U2 is connected with a gate of Q2, drains of Q1 and Q2 of U2 are connected with a primary of a high-frequency transformer T1, a source is grounded, and a secondary of the high-frequency transformer T1 is connected with a metal working head.

Further, the upper end of the R20 sampling resistor is connected to the HGND end of the RF conversion and output circuit and the left end of R32, the right end of R32 is connected to the 32 rd pin of the MCU microprocessor, the lower end of the R20 sampling resistor is connected to the ground GND, and the output signal of the temperature sampling resistor R19 is connected to the 7 th pin of the MCU microprocessor.

Further, the USB charging and lithium battery control circuit comprises a USB charging circuit, a lithium battery and a MOS tube switching circuit;

the USB charging circuit is connected with the lithium battery and used for charging the lithium battery;

the lithium battery is connected with the MOS tube switching circuit and is used for supplying power to the DC-DC direct current control circuit;

the interface USB_CHK is connected to the MCU microprocessor and used for detecting the USB adapter, the interface BAT is connected with the MCU microprocessor, and the interface CHRGE_CHK is connected to the 7 th pin of the MCU microprocessor and used for detecting the charging state of the lithium battery.

Further, the VIN end of the DC-DC control circuit is connected with

pins

5, 6, 7 and 8 of the U5 of the USB charging and lithium battery control circuit, the output of the 6V5 is connected with the 6V5 interface of the RF conversion and output circuit, the VDD output end of the DC-DC control circuit is connected with the MCU microprocessor and the triaxial gravity sensing control circuit, and the buzzer prompt circuit is connected with the VDD end of the RF conversion and output circuit.

Further, the three-axis gravity sensor IC communication port of the three-axis gravity sensing control circuit is connected with the SPI interface of the MCU microprocessor, and the two interrupt ports are respectively connected with the interrupt port of the MCU microprocessor.

Further, one end of the buzzer prompt circuit resistor R11 is connected with the MCU microprocessor IO port, the other end of the buzzer prompt circuit resistor R11 is connected to the base end of the triode Q3, the emitter of the Q3 is grounded, the collector of the Q3 is connected with the negative end of the buzzer LS1, and the positive end of the buzzer LS1 is connected with the VDD voltage through the current limiting resistor.

Further, one end of the 8 current limiting resistors of the LED display circuit is connected with the MCU microprocessor IO port, the other ends of the 8 current limiting resistors of the LED display circuit are respectively connected to positive electrode ends of the 8 LED light emitting diodes, and negative electrode ends of the 8 LED light emitting diodes are grounded.

Further, one end of the K1 of the key circuit is grounded, the other end of the K1 of the key circuit is connected with isolation diodes D11 and D12, the D11 is connected to the MCU, and the D12 is connected to the 4 th pin of the U5MOS tube of the USB charging and lithium battery control circuit.

The utility model has the following beneficial effects:

according to the utility model, through a series of improvements, various induction controls are integrated, a triaxial gravity induction control circuit is added to induce the operation gesture of a user of the cosmetic instrument, and the movement frequency is used for controlling the intensity of radio frequency power, so that the circuit is simple, the control is sensitive, the energy loss of a battery is reduced, and the use experience is enhanced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic diagram of the MCU microprocessor according to the present utility model;

FIG. 3 is a schematic diagram of the RF conversion and output circuit of the present utility model;

FIG. 4 is a schematic diagram of the RF current and temperature control circuit according to the present utility model;

FIG. 5 is a schematic diagram of a USB charging and lithium battery control circuit according to the present utility model;

FIG. 6 is a schematic diagram of a DC-DC control circuit according to the present utility model;

FIG. 7 is a schematic diagram of a three-axis gravity sensing control circuit according to the present utility model;

FIG. 8 is a schematic diagram of a buzzer alert circuit according to the present utility model;

FIG. 9 is a schematic diagram of an LED display circuit according to the present utility model;

fig. 10 is a schematic structural diagram of a key detection circuit according to the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-10, the present utility model is a control circuit for a radio frequency cosmetic instrument.

The circuit at least comprises an MCU microprocessor, an RF conversion and output circuit, an RF radio frequency current and temperature control circuit, a USB charging and lithium battery control circuit, a DC-DC direct current control circuit, a triaxial gravity sensing control circuit, a buzzer prompt circuit, an LED display circuit and a key detection circuit;

referring to FIG. 2, the MCU microprocessor: the device is used for controlling the work of an RF conversion and output circuit, an RF radio frequency current and temperature control circuit, a USB charging and lithium battery control circuit, a DC-DC direct current control circuit, a triaxial gravity sensing control circuit, a buzzer prompting circuit, an LED display circuit and a key detection circuit, so that the device can be used for controlling the work of the RF conversion and output circuit, the RF radio frequency current and temperature control circuit, the USB charging and lithium battery control circuit, the DC-DC direct current control circuit, the triaxial gravity sensing control circuit, the buzzer prompting circuit, the LED display circuit and the key detection circuit;

further, the RF driving part adopts a texas instrument high-speed dual-channel 4A grid driver UCC27424, and the RF output part adopts a PEI22 PC95 high-frequency magnetic core with high magnetic permeability and low loss.

Referring to fig. 3,

pins

9, 10 and 11 of the MCU microprocessor are respectively connected to pins 2[ RF1_m ], 4[ RF2_m ] and 1[ rf_en ] of U2 of the RF conversion and output circuit, pin 7 of U2 is connected to the gate of Q1, pin 5 of U2 is connected to the gate of Q2, the drains of Q1 and Q2 of U2 are connected to the primary of the high frequency transformer T1, the source is grounded, and the secondary of the high frequency transformer T1 is connected to the metal working head;

when the MCU outputs complementary symmetrical high-frequency PWM pulse signals to the U2 for pulse shaping, delay and current amplification to drive the Q1 and Q2 power field effect MOS transistors, the high-frequency step-up transformer T1 circuit is further driven to convert the output direct-current voltage into high-frequency alternating-current signals, and then the high-frequency alternating-current signals are further acted on the skin through an external radio-frequency working head.

Referring to fig. 4, the upper end of the R20 sampling resistor is connected to the HGND end of the RF conversion and output circuit and the left end of R32, the right end of R32 is connected to the 32 th pin of the MCU microprocessor, the lower end of the R20 sampling resistor is connected to the ground GND, and the output signal of the temperature sampling resistor R19 is connected to the 7 th pin of the MCU microprocessor;

description of working principle: when the RF radio frequency works, the voltage drop at the two ends of the current sampling resistor R20 enters the MCU through the R32 to carry out AD analog-to-digital conversion, the RF radio frequency current is calculated, when the current exceeds the preset maximum value, the output duty ratio of PWM is controlled to control the RF radio frequency generating circuit to reduce the power output, in addition, the temperature of the position where the RF energy acts is prevented from being scalded due to the fact that the temperature of the position where the RF energy acts is too high by the temperature sampling NTC with the negative temperature coefficient, and the safety performance of the RF cosmetic instrument is improved.

Referring to fig. 5, the USB charging and lithium battery control circuit includes a USB charging circuit, a lithium battery, and a MOS transistor switch circuit;

the lithium battery is connected with the MOS tube switching circuit and is used for supplying power to the DC-DC control circuit;

preferably, the USB charging and lithium battery control circuit is shown as J1 is a USB power input interface, U4 is a lithium battery charging management IC, an interface USB_CHK is connected to the MCU microprocessor to detect the USB adapter, whether the USB adapter is connected is detected, an interface BAT is connected with the MCU microprocessor for detecting the electric quantity of the lithium battery, and an interface charge_CHK is connected to the 7 th pin of the MCU microprocessor for detecting the charging state of the lithium battery.

Referring to fig. 6, the VIN end of the DC-DC control circuit is shown as being connected to

pins

5, 6, 7 and 8 of the U5 of the USB charging and lithium battery control circuit, the 6V5 output is connected to the 6V5 interface of the RF conversion and output circuit, the VDD output end of the DC-DC control circuit is connected to the MCU microprocessor and the tri-axial gravity sensing control circuit, and the buzzer prompt circuit is connected to the VDD end of the RF conversion and output circuit;

working principle: the DC-DC direct current control circuit mainly comprises 1 boosting IC and 1 LDO voltage stabilizing IC, the boosting IC boosts the power supply from the MOS tube switch to 6.5V and provides the power supply for the RF high-frequency transformer to boost and amplify the power, the LDO voltage stabilizing IC stabilizes the 6.5V voltage output by the boosting IC to 4V [ VDD ], and provides the power supply for the MCU microprocessor, the triaxial gravity sensing control circuit, the buzzer prompt circuit and the RF conversion and output circuit.

Referring to fig. 7, the three-axis gravity sensing control circuit is shown as a three-axis gravity sensing sensor IC communication port connected with the SPI interface of the MCU microprocessor, and two interrupt ports connected with the interrupt ports of the MCU microprocessor respectively;

working principle: the triaxial gravity sensing control circuit comprises 1 triaxial gravity sensing sensor IC and 1 power filter capacitor. MCU microprocessor passes through SPI and triaxial gravity induction sensor IC communication, reads the gravity and the acceleration value of real-time IRF product's three orientation, Y, Z, and IRF is the short form of control circuit of the RF radio frequency beauty instrument of "fan" brand, obtains the inclination of IRF product and the removal frequency of user's use IRF product through calculation, adjusts IRF product mode and power and improves user's use experience.

Referring to fig. 8, one end of a resistor R11 shown in the drawing of the buzzer prompt circuit is connected to the IO port of the MCU microprocessor, the other end of the resistor R11 shown in the drawing of the buzzer prompt circuit is connected to the base end of a triode Q3, the emitter of Q3 is grounded, the collector of Q3 is connected to the negative end of a buzzer LS1, and the positive end of the buzzer LS1 is connected to the VDD voltage through a current limiting resistor;

working principle: the buzzer prompt circuit comprises 1 buzzer LS1, a triode Q3, two resistors R15 and R16. The triode Q3 amplifies the audio signal current sent from the IO port of the MCU to drive the buzzer LS1 to send out the prompt sound comprising keys, the battery power is low, and the working time is long.

Referring to fig. 9, one end of the 8 current limiting resistors shown in the diagram is connected with the IO port of the MCU, the other end of the 8 current limiting resistors shown in the diagram is connected to the positive ends of the 8 LEDs respectively, and the negative ends of the 8 LEDs are grounded;

working principle: the LED display circuit comprises 8 LED light emitting diodes and 8 current limiting resistors, and the level sent by the IO port of the MCU is received to control the on and off of each LED light emitting diode. Indicating the operational mode and the operational current state of the IRF.

Referring to fig. 10, one end of a key circuit shown in the figure is grounded, the other end of the key circuit shown in the figure is connected with isolation diodes D11 and D12, D11 is connected to the MCU, and D12 is connected to pin 4 of the U5MOS transistor of the USB charging and lithium battery control circuit.

Working principle: the key circuit comprises two light touch key switches, and receives a user instruction for controlling the total power switch, the working mode and the working current intensity of the IRF circuit. And when K1 is pressed down, the U5-MOS power switch is turned on through D11 to enter the working state. When in an operating state, K1 is pressed to switch different modes of operation. K2 is pressed to switch the working current intensity in the working state.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.

Claims

1. A control circuit for a radio frequency cosmetic instrument, characterized by: the circuit consists of an MCU microprocessor, an RF conversion and output circuit, an RF radio frequency current and temperature control circuit, a USB charging and lithium battery control circuit, a DC-DC direct current control circuit, a triaxial gravity sensing control circuit, a buzzer prompt circuit, an LED display circuit and a key detection circuit;

2. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: the 9 th, 10 th and 11 th pins of the MCU microprocessor are respectively connected with the 2[ RF1_M ], 4[ RF2_M ] and 1[ RF_EN ] pins of the U2 of the RF conversion and output circuit, the 7 th pin of the U2 is connected with the grid electrode of the Q1, the 5 th pin of the U2 is connected with the grid electrode of the Q2, the drains of the Q1 and the Q2 of the U2 are connected with the primary side of the high-frequency transformer T1, the source is grounded, and the secondary side of the high-frequency transformer T1 is connected with a metal working head.

3. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: the upper end of the R20 sampling resistor is connected to the HGND end of the RF conversion and output circuit and the left end of the R32, the right end of the R32 is connected with the 32 rd pin of the MCU microprocessor, the lower end of the R20 sampling resistor is connected to the ground wire GND, and the output signal of the temperature sampling resistor R19 is connected to the 7 th pin of the MCU microprocessor.

4. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: the USB charging and lithium battery control circuit comprises a USB charging circuit, a lithium battery and a MOS tube switching circuit;

the interface USB_CHK is connected to the MCU microprocessor for detecting the USB adapter, the interface BAT is connected with the MCU microprocessor, and the interface CHARGE_CHK is connected to the 7 th pin of the MCU microprocessor for detecting the charging state of the lithium battery.

5. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: the DC-DC direct current control circuit VIN end is connected with pins 5, 6, 7 and 8 of the U5 of the USB charging and lithium battery control circuit, the output of the 6V5 is connected with a 6V5 interface of the RF conversion and output circuit, the VDD output end of the DC-DC direct current control circuit is connected with the MCU microprocessor and the triaxial gravity sensing control circuit, and the buzzer prompt circuit is connected with the VDD end of the RF conversion and output circuit.

6. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: and the three-axis gravity sensing sensor IC communication port of the three-axis gravity sensing control circuit is connected with the SPI interface of the MCU microprocessor, and the two interrupt ports are respectively connected with the interrupt port of the MCU microprocessor.

7. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: one end of the buzzer prompt circuit resistor R11 is connected with the MCU microprocessor IO port, the other end of the buzzer prompt circuit resistor R11 is connected to the base end of the triode Q3, the emitter of the Q3 is grounded, the collector of the Q3 is connected with the negative end of the buzzer LS1, and the positive end of the buzzer LS1 is connected with the VDD voltage through the current limiting resistor.

8. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: one end of the 8 current limiting resistors of the LED display circuit is connected with the MCU microprocessor IO port, the other ends of the 8 current limiting resistors of the LED display circuit are respectively connected to the positive electrode ends of the 8 LED light emitting diodes, and the negative electrode ends of the 8 LED light emitting diodes are grounded.

9. A control circuit for a radio frequency cosmetic instrument according to claim 1, wherein: the K1 one end ground connection of keying circuit, keying circuit's K1 other end connect isolation diode D11 and D12, D11 is connected to MCU, D12 is connected to USB charge and lithium cell control circuit's U5MOS pipe pin 4.