Low-voltage power supply conversion electromagnetic heating circuit and electric heating comb

Abstract

The invention discloses a low-voltage power supply conversion electromagnetic heating circuit and an electric heating comb, the heating circuit is used for generating heat in the electric heating comb, the electromagnetic heating circuit comprises an MCU circuit, an electromagnetic heating circuit and a current amplification circuit, and the MCU circuit is connected with the MCU circuit; a first connecting end arranged on the MCU circuit is connected with a second connecting end arranged on the electromagnetic heating circuit, and the MCU circuit inputs the received amplified electric signal to the MCU chip through a sixth connecting end; an electromagnetic module is arranged in the electromagnetic heating circuit, the electromagnetic module comprises a heating coil and a metal sheet, the electromagnetic module generates electromagnetic conversion through the heating coil and the metal sheet so as to perform a heating function, and a gap is formed between the heating coil and the metal sheet. The magnetic field in the circuit directly generates eddy current in the iron sheet or the steel sheet to convert electric energy into heat energy, so that the heat conduction process from the heating element to the comb tip is omitted, and the energy loss is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of household appliances, and in particular to a low-voltage power supply conversion electromagnetic heating circuit and an electric heating comb. Background Art

[0002] The problems faced by existing electric heating comb technology mainly focus on three aspects: inconvenience in use, poor safety and low heating efficiency. Since the AC heating comb needs to be plugged into the AC power supply, it is necessary to carry a long power cord when using it, which not only limits the user's freedom of movement, but also may cause inconvenience in use due to cable entanglement. In addition, direct heating with AC power lacks effective safety isolation measures, there is a risk of electric shock, and the safety factor is not high. On the other hand, although the battery-powered heating comb solves the portability problem, its heating efficiency is low and the heating speed is slow. Especially when the battery voltage drops, the heating power is significantly reduced, resulting in poor heating effect. At the same time, the instability of the battery voltage also causes fluctuations in the heating effect, which greatly reduces the user experience. These factors jointly restrict the practicality and market acceptance of existing electric heating combs. Summary of the invention

[0003] The embodiments of the present invention provide a low-voltage power supply conversion electromagnetic heating circuit and an electric heating comb, aiming to solve the problem of low efficiency of the heat generation process of the electric heating comb in the prior art methods.

[0004] In the first aspect, an embodiment of the present invention discloses a low-voltage power supply conversion electromagnetic heating circuit for generating heat inside an electric heating comb, wherein the electromagnetic heating circuit comprises an MCU circuit, an electromagnetic heating circuit and a current amplifying circuit, wherein the MCU circuit, the electromagnetic heating circuit and the current amplifying circuit are connected in sequence and transmit current; a first connection terminal provided on the MCU circuit is connected to a second connection terminal provided on the electromagnetic heating circuit, a third connection terminal provided on the electromagnetic heating circuit is connected to a fourth connection terminal provided on the current amplifying circuit, and a fifth connection terminal provided on the current amplifying circuit is connected to a sixth connection terminal provided on the MCU circuit; and The MCU chip is configured to output the generated PWM signal to the second connection end through the first connection end, the electromagnetic heating circuit outputs the magnetic field heating sampling current to the fourth connection end through the third connection end, the current amplifying circuit outputs the amplified electrical signal to the sixth connection end through the fifth connection end, and the MCU circuit inputs the received amplified electrical signal to the MCU chip through the sixth connection end; an electromagnetic module is configured in the electromagnetic heating circuit, the electromagnetic module includes a heating coil and a metal sheet, the electromagnetic module generates electromagnetic conversion through the heating coil and the metal sheet to perform heating, and a gap is configured between the heating coil and the metal sheet.

[0005] Furthermore, a seventh capacitor is arranged in the electromagnetic module, one end of the seventh capacitor is connected to the drain of the first MOS tube and the second MOS tube, the gate of the second MOS tube is connected to the anode of the first diode, the gate of the first MOS tube is connected to the anode of the second diode, a thirty-first resistor and a nineteenth resistor are arranged between the anode of the second diode and the third connection end, and the anode of the second diode is grounded.

[0006] Furthermore, the electromagnetic heating circuit also includes a third MOS tube, a fourth MOS tube, a fifth MOS tube and a sixth MOS tube, the second connection end is connected to the gate of the sixth MOS tube, the drain of the sixth MOS tube is connected to the gate of the fourth MOS tube, the drain of the fourth MOS tube is connected to the gate of the third MOS tube, the source of the third MOS tube is connected to the drain of the fifth MOS tube, and the source of the fifth MOS tube is grounded.

[0007] Furthermore, the current amplification circuit includes a current amplification module, the input end of the current amplification module is connected to the fourth connection end, the output end of the current amplification module is connected to the fifth connection end, a twelfth resistor is arranged between the fifth connection end and the output end of the current amplification module, and the current amplification module is connected in parallel with the fifth resistor and the eighth resistor.

[0008] Furthermore, the output end of the current amplification module is connected to a bias module, and the bias module includes a seventeenth resistor and an eighteenth resistor, and the seventeenth resistor and the eighteenth resistor are connected in parallel and grounded at the same time.

[0009] Furthermore, the current amplification module also includes a filtering module, the filtering module includes a thirteenth capacitor and a thirteenth resistor, the thirteenth resistor is arranged between the fourth connection end and the input end of the current amplification module, and the fourth connection end is connected to the thirteenth capacitor and grounded.

[0010] Further, the fifth MOS tube is a PMOS tube, and the first MOS tube, the second MOS tube, the third MOS tube, the fourth MOS tube and the sixth MOS tube are NMOS tubes.

[0011] Furthermore, the electromagnetic heating circuit also includes a fourteenth capacitor and a twentieth resistor, the third connection end is grounded through the fourteenth capacitor, and the twentieth resistor is connected in series with the nineteenth resistor.

[0012] Furthermore, the second diode is connected in parallel with the thirty-first resistor.

[0013] In the second aspect, an embodiment of the present invention discloses an electric heating comb, which uses the above-mentioned low-voltage power supply conversion electromagnetic heating circuit, wherein a power supply module is arranged in the electric heating comb, one end of the power supply module is connected to an external power supply, and the other end is connected to the first connection end through a power switch to input current, and the electromagnetic heating circuit arranged in the low-voltage power supply conversion electromagnetic heating circuit performs electromagnetic conversion to generate heat and outputs it to the electric heating comb.

[0014] The above-mentioned low-voltage power supply conversion electromagnetic heating circuit and electric heating comb use the principle of electromagnetic induction to convert the low-voltage direct current (DC) provided by the battery into high-frequency alternating current (AC) through a conversion circuit (usually a high-frequency inverter). This high-frequency alternating current generates a changing magnetic field in the heating coil. When the changing magnetic field passes through the iron or steel sheet, according to Faraday's law of electromagnetic induction, eddy currents (closed current loops) are generated inside the metal. These eddy currents generate heat due to the resistance of the metal, thereby heating the metal sheet. Only two batteries (usually lithium batteries) are required, and such a battery pack usually provides a voltage of 7.4V. The low-voltage power supply system is safer than the mains system, reducing the risk of electric shock and short circuit. Since there is no direct electrical connection between the electricity and the heating plate, even if the heating plate is damaged or contacts water, it will not cause the current to pass directly through the human body, thereby improving the safety of use. The magnetic field directly generates eddy currents inside the iron or steel sheet, and these eddy currents directly convert electrical energy into thermal energy, eliminating the heat conduction process from the heating element to the comb tip, reducing energy loss. Since the intermediate heat transfer link is removed, the heating response time is faster and the set temperature can be reached quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of the operation flow of a low-voltage power supply conversion electromagnetic heating circuit provided by an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of the overall structure of a low-voltage power supply conversion electromagnetic heating circuit provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the structure of an MCU circuit provided in an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the structure of an electromagnetic heating circuit provided by an embodiment of the present invention;

[0020] Figure 5A schematic diagram of the structure of a current amplifying circuit provided in an embodiment of the present invention.

[0021] Figure Number:

[0022] 1. First connection terminal; 2. Second connection terminal; 3. Third connection terminal; 4. Fourth connection terminal; 5. Fifth connection terminal; 6. Sixth connection terminal; 7. Electromagnetic module. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all combinations of one or more of the associated listed items.

[0027] like Figures 1 to 5As shown in the figure, the specific electronic component numbers and their setting positions are shown in the figure. The low-voltage power supply conversion electromagnetic heating circuit provided in this embodiment is used to generate heat inside the electric heating comb. The electromagnetic heating circuit includes an MCU circuit, an electromagnetic heating circuit and a current amplifying circuit. The MCU circuit, the electromagnetic heating circuit and the current amplifying circuit are connected in sequence and transmit current; the first connection terminal 1 set on the MCU circuit is connected to the second connection terminal 2 set on the electromagnetic heating circuit, the third connection terminal 3 set on the electromagnetic heating circuit is connected to the fourth connection terminal 4 set on the current amplifying circuit, and the fifth connection terminal 5 set on the current amplifying circuit is connected to the sixth connection terminal 5 set on the MCU circuit. The MCU chip arranged in the MCU circuit outputs the generated PWM signal to the second connection terminal 2 through the first connection terminal 1, the electromagnetic heating circuit outputs the magnetic field heating sampling current to the fourth connection terminal 4 through the third connection terminal 3, the current amplifying circuit outputs the amplified electrical signal to the sixth connection terminal 6 through the fifth connection terminal 5, and the MCU circuit inputs the received amplified electrical signal to the MCU chip through the sixth connection terminal 6; an electromagnetic module 7 is arranged in the electromagnetic heating circuit, and the electromagnetic module 7 includes a heating coil and a metal sheet. The electromagnetic module 7 generates electromagnetic conversion through the heating coil and the metal sheet to perform heating, and a gap is arranged between the heating coil and the metal sheet.

[0028] In the actual usage scenario, the MCU chip is responsible for generating a PWM (pulse width modulation) signal to control the heating power and temperature. The first connection terminal 1 is used to output a PWM signal to the electromagnetic heating circuit. The second connection terminal 2 receives the PWM signal output by the MCU circuit. The third connection terminal 3 outputs a magnetic field heating sampling current to the current amplifier circuit. The electromagnetic module 7 includes a heating coil and a metal sheet, which are used to generate electromagnetic conversion for heating. Receive the sampling current output by the electromagnetic heating circuit. Output the amplified electrical signal to the MCU circuit. Connected to the MCU circuit for signal feedback. The MCU chip generates a PWM signal and outputs it to the second connection terminal 2 of the electromagnetic heating circuit through the first connection terminal 1. After receiving the PWM signal, the electromagnetic heating circuit generates electromagnetic conversion through the heating coil and the metal sheet, thereby heating the metal sheet. A gap is set between the heating coil and the metal sheet to allow the formation of an electromagnetic field and reduce direct contact, thereby improving safety. The electromagnetic heating circuit outputs a magnetic field heating sampling current to the fourth connection terminal 4 of the current amplifier circuit through the third connection terminal 3. The current amplifier circuit amplifies the sampling current and outputs it to the sixth connection terminal 6 of the MCU circuit through the fifth connection terminal 5. The MCU circuit receives the amplified electrical signal through the sixth connection terminal 6 and inputs it into the MCU chip to achieve closed-loop control to ensure the stability and accuracy of the heating process. The circuit design takes into account the isolation of electricity and heating elements to reduce the risk of electric shock. The metal sheet is directly heated by electromagnetic conversion, eliminating the intermediate heat transfer link and improving the heating efficiency. The closed-loop control of the MCU chip can accurately adjust the heating power and temperature to ensure the user experience.

[0029] In summary, through the principle of electromagnetic induction, the low-voltage direct current (DC) provided by the battery is converted into high-frequency alternating current (AC) through a conversion circuit (usually a high-frequency inverter), and this high-frequency alternating current generates a changing magnetic field in the heating coil. When the changing magnetic field passes through the iron or steel sheet, according to Faraday's law of electromagnetic induction, eddy currents (closed current loops) are generated inside the metal. These eddy currents generate heat due to the resistance R of the metal, thereby heating the metal sheet. Only 2 batteries (usually lithium batteries) are required, and such a battery pack usually provides a voltage of 7.4V. The low-voltage power supply system is safer than the mains system, reducing the risk of electric shock and short circuit. Since there is no direct electrical connection between the electricity and the heating plate, even if the heating plate is damaged or exposed to water, it will not cause the current to pass directly through the human body, thereby improving the safety of use. The magnetic field directly generates eddy currents inside the iron or steel sheet, which directly convert electrical energy into heat energy, eliminating the heat conduction process from the heating element to the comb tip and reducing energy loss. Since the intermediate heat transfer link is removed, the heating response time is faster and the set temperature can be reached quickly. Through high-frequency inverter technology, the voltage of two 7.4V batteries is converted into a high voltage of 30V to 50V for excitation. This voltage boosting method utilizes the magnetic field resonance effect, which can more effectively generate eddy currents in the metal sheet and improve heating efficiency. High voltage accelerates the formation of eddy currents, thereby improving the efficiency of converting magnetic fields into thermal energy, making the overall energy efficiency ratio higher. This design of battery low-voltage power supply conversion electromagnetic heating comb not only improves the safety of use, but also improves the heating efficiency and user experience. It is suitable for application scenarios that require portability, fast heating, safety and reliability, such as portable personal care appliances. Through technological innovation, this product is expected to gain wide recognition and application in the market.

[0030] Furthermore, a seventh capacitor C7 is provided in the electromagnetic module 7, one end of the seventh capacitor C7 is connected to the drain of the first MOS tube Q1 and the second MOS tube Q2, the gate of the second MOS tube Q2 is connected to the anode of the first diode D1, the gate of the first MOS tube Q1 is connected to the anode of the second diode D2, a thirty-first resistor R31 and a nineteenth resistor R19 are provided between the anode of the second diode D2 and the third connection terminal 3, and the anode of the second diode D2 is grounded.

[0031] Furthermore, the electromagnetic heating circuit also includes a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5 and a sixth MOS tube Q6, the second connection end 2 is connected to the gate of the sixth MOS tube Q6, the drain of the sixth MOS tube Q6 is connected to the gate of the fourth MOS tube Q4, the drain of the fourth MOS tube Q4 is connected to the gate of the third MOS tube Q3, the source of the third MOS tube Q3 is connected to the drain of the fifth MOS tube Q5, and the source of the fifth MOS tube Q5 is grounded.

[0032] Furthermore, the current amplification circuit includes a current amplification module, the input end of the current amplification module is connected to the fourth connection terminal 4, the output end of the current amplification module is connected to the fifth connection terminal 5, a twelfth resistor R12 is arranged between the fifth connection terminal 5 and the output end of the current amplification module, and the current amplification module is connected in parallel with the fifth resistor R5 and the eighth resistor R8.

[0033] Specifically, the seventh capacitor C7 is connected to the drain of the first MOS tube Q1 and the second MOS tube Q2 for filtering and energy storage, which helps to stabilize the voltage and current in the circuit. The first MOS tube Q1 and the second MOS tube Q2: These metal-oxide-semiconductor field effect transistors (MOSFETs) are used to control the flow of current, and their gates are connected to the anode of the diode for switch control. The first diode D1 and the second diode D2: These diodes are used for rectification and protection circuits, and the anode of the second diode D2 is grounded to provide a reference level or protect the circuit from reverse voltage. The thirty-first resistor R31 and the nineteenth resistor R19 are used for current limiting, voltage division or providing gate drive current. The third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5 and the sixth MOS tube Q6: These MOS tubes form a complex switch network for controlling the current of the heating coil. The gate of the sixth MOS tube Q6 is connected to the second connection terminal 2, indicating that it is directly controlled by the PWM signal output by the MCU circuit. The connection method of these MOS tubes is used to achieve high-frequency inversion, thereby generating high-frequency AC current in the heating coil. The current amplifier module is used to amplify the current signal sampled from the heating coil so that the MCU can control the heating process more accurately. The twelfth resistor R12 is used to isolate or limit the output current of the current amplifier module. The fifth resistor R5 and the eighth resistor R8 are connected in parallel with the current amplifier module for bias, feedback or protection purposes. The switch network composed of the third to sixth MOS tubes Q6 is used to achieve high-frequency inversion, converting low-voltage direct current into high-frequency alternating current to generate a changing magnetic field in the heating coil. The current amplifier module ensures that the current signal sampled from the heating coil is strong enough so that the MCU can accurately monitor and control the heating process. The seventh capacitor C7, the first and second diodes D2, and the associated resistor R jointly ensure the stability of the circuit and protect the circuit components from overvoltage and overcurrent. With this design, the electromagnetic heating comb can work efficiently and safely while providing precise heating control. This circuit design is essential to achieve miniaturization, lightweight and high performance of the product.

[0034] Furthermore, the output end of the current amplification module is connected to the bias module, and the bias module includes a seventeenth resistor R17 and an eighteenth resistor R18. The seventeenth resistor R17 and the eighteenth resistor R18 are connected in parallel and grounded at the same time.

[0035] Furthermore, the current amplification module also includes a filtering module, which includes a thirteenth capacitor C13 and a thirteenth resistor R13. The thirteenth resistor R13 is set between the fourth connection terminal 4 and the input end of the current amplification module. The fourth connection terminal 4 is connected to the thirteenth capacitor C13 and grounded.

[0036] Further, the fifth MOS transistor Q5 is a PMOS transistor, and the first MOS transistor Q1 , the second MOS transistor Q2 , the third MOS transistor Q3 , the fourth MOS transistor Q4 and the sixth MOS transistor Q6 are NMOS transistors.

[0037] Specifically, the output end of the current amplifier module is connected to the bias module, and the bias module provides a stable reference voltage for the current amplifier module to ensure its normal operation. The seventeenth resistor R17 and the eighteenth resistor R18 are connected in parallel and grounded to set the working point of the current amplifier module, that is, to provide an appropriate bias voltage for it. This configuration helps to stabilize the output of the amplifier and participate in the feedback mechanism. The two components of the thirteenth capacitor C13 and the thirteenth resistor R13 constitute a simple RC filter for filtering the signal at the input end of the current amplifier module. The thirteenth resistor R13 is located between the fourth connection terminal 4 and the input end of the current amplifier module, and the thirteenth capacitor C13 is grounded. Such a configuration helps to remove high-frequency noise in the signal and ensure that the signal input to the current amplifier module is clean. The RC filter suppresses high-frequency noise through a combination of resistors and capacitors and allows low-frequency signals to pass, which is very important for accurately controlling the heating process. PMOS (P-channel metal-oxide-semiconductor field effect transistor) is turned on when the gate voltage is lower than the source voltage, and is usually used for high-side switches or load switches in circuits. The first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4 and the sixth MOS tube Q6 are NMOS tubes: NMOS (N-channel metal-oxide-semiconductor field effect transistor) is turned on when the gate voltage is higher than the source voltage, and is often used in low-side switches or amplifiers. The bias module provides a stable bias voltage to ensure that the current amplifier module can maintain consistent performance under different working conditions. By reducing noise, the stability and reliability of the circuit are improved, which is very important for precise control of electromagnetic heating. The selection of PMOS and NMOS tubes is based on their different roles in the circuit. The PMOS tube acts as a high-side switch, while the NMOS tube acts as a low-side switch. This configuration helps to optimize the design and performance of the circuit. In summary, these circuit designs and component selections are all aimed at achieving an efficient, stable and safe electromagnetic heating system, which is suitable for applications such as portable electric heating combs. Through carefully designed electronic circuits, it can be ensured that the product provides convenience while ensuring the safety and comfort of the user.

[0038] Furthermore, the electromagnetic heating circuit further includes a fourteenth capacitor C14 and a twentieth resistor R20. The third connection terminal 3 is grounded via the fourteenth capacitor C14. The twentieth resistor R20 is connected in series with the nineteenth resistor R19.

[0039] Further, the second diode D2 is connected in parallel with the thirty-first resistor R31.

[0040] Specifically, the fourteenth capacitor C14 is connected between the third connection terminal 3 and the ground for further filtering or decoupling. In the electromagnetic heating circuit, the fourteenth capacitor C14 helps to eliminate high-frequency noise, protect the circuit from interference, and ensure the stability of the heating process. The twentieth resistor R20 is connected in series with the nineteenth resistor R19 to set a specific resistance R value in the circuit, affecting the magnitude of the current, or to protect circuit components from overcurrent. The second diode D2 is connected in parallel with the thirty-first resistor R: This configuration has several functions. The thirty-first resistor R31 in parallel is used to limit the current flowing through the second diode D2 and protect the diode D from damage by overcurrent. At the same time, this configuration also participates in the feedback mechanism of the circuit, helping to maintain the stability of the circuit and adjust the heating power. The addition of the fourteenth capacitor C14 enhances the circuit's ability to suppress high-frequency noise and improves the overall performance and reliability of the electromagnetic heating circuit. The series configuration of the twentieth resistor R20 and the nineteenth resistor R19, as well as the parallel configuration of the second diode D2 and the thirty-first resistor R31, all help limit the current and prevent the circuit components from being damaged due to overcurrent, thereby improving the safety and durability of the circuit. With these additional components and configurations, the circuit is able to remain stable under different operating conditions, which is essential for precise control of the heating process. In summary, these circuit design details are all intended to improve the performance and user experience of the electromagnetic heating comb. Through a carefully designed circuit, it can be ensured that the product can provide efficient heating while also ensuring long-term stable and safe use.

[0041] In summary, the two components, the heating coil L2 and the seventh capacitor C7, work together to convert electrical energy into magnetic energy. The heating coil L2 generates a magnetic field under a changing current, and the seventh capacitor C7 helps adjust the frequency of the current change. The two MOS tubes, the first MOS tube Q1 and the second MOS tube Q2, control the conduction frequency and duty cycle of the coil, thereby controlling the amount of energy absorbed by the coil. They are key switching elements in the circuit. The twentieth resistor R20 serves as a current sampling resistor R, which provides a feedback signal by detecting the current flowing through the coil to monitor the heating power. The twenty-eighth resistor R28 and the thirty-first resistor R31: prevent the drive waveform from oscillating and ensure the stable switching of the MOS tube. The first diode D1 and the second diode D2: accelerate the turn-off speed of the first MOS tube Q1 and the second MOS tube Q2 to improve the circuit efficiency. The third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5, and the sixth MOS tube Q6: These MOS tubes and related resistors and capacitors form an amplifier circuit for amplifying the PWM signal output by the MCU and enhancing the driving capability. It is composed of U1 and the third capacitor C3, and outputs a PWM signal to control the operation of the electromagnetic heating circuit. Used to detect the electromagnetic heating power output, and input to the MCU for judgment and processing through the AD converter. The seventeenth resistor R17 and the eighteenth resistor R18: form a bias circuit to provide a stable reference voltage for the amplifier circuit. The fifteenth resistor R5, the eighth resistor R8, the twelfth resistor R12, and U4: form an amplifier circuit for amplifying the current sampling signal. The thirteenth resistor R13 and the thirteenth capacitor C13: form a filter circuit to remove noise from the signal and ensure the accuracy of the signal. When the MCU's U1 pin 16 outputs a high level, a series of MOS tube conduction and cutoff actions occur, causing the current to pass through the heating coil L2, generating a magnetic field, and generating eddy current heating inside the iron or steel sheet. When the U1 pin 16 outputs a low level, the conduction and cutoff states of the MOS tube change, stopping the supply of energy to the heating coil, while allowing the magnetic field to decay, completing a heating cycle. Through this complex circuit design and control strategy, the electromagnetic heating comb can achieve efficient and precise heating control while maintaining the stability and safety of the circuit.

[0042] The present invention discloses an electric heating comb, which uses the above-mentioned low-voltage power supply conversion electromagnetic heating circuit. A power module is arranged in the electric heating comb, one end of the power module is connected to an external power supply, and the other end is connected to a first connection end 1 through a power switch to input current. The electromagnetic heating circuit arranged in the low-voltage power supply conversion electromagnetic heating circuit performs electromagnetic conversion to generate heat and outputs it to the electric heating comb. The above-mentioned low-voltage power supply conversion electromagnetic heating circuit and the electric heating comb realize efficient and safe heating functions by adopting the low-voltage power supply conversion electromagnetic heating circuit. The design of the electric heating comb integrates advanced electronic technology and heat conversion technology, and provides users with a portable and efficient personal care tool. A power module is arranged in the electric heating comb, and one end of the power module is designed with an interface for an external power supply, which can be a battery interface or other low-voltage power supply interface. The other end of the power module is connected to the first connection end 1 of the low-voltage power supply conversion electromagnetic heating circuit through a power switch. The power switch is used to control the input of current, so that the user can turn on or off the electric heating comb conveniently. The electromagnetic heating circuit is located inside the electric heating comb, and is responsible for converting the input low-voltage current into electromagnetic energy, thereby generating heat. The generated heat is output through specific parts of the electric heating comb (such as comb teeth) and is used to heat the hair or scalp to achieve a care effect. Since low-voltage power supply is adopted and the electricity and heating parts are completely isolated, the safety of use is improved. Heat is directly generated through electromagnetic conversion, which eliminates the intermediate heat transfer link and improves the efficiency of thermal energy conversion. Battery power is used, and no external power supply is required, making the electric heating comb more portable. Compared with traditional electric heating combs, the present invention has a higher energy efficiency ratio and contributes to energy conservation and emission reduction. The heating power and temperature are precisely controlled by the MCU circuit to ensure the comfort and safety of use. In addition to the basic heating function, other functions such as temperature adjustment and timed shutdown can also be designed and added. The electric heating comb of the present invention achieves a safe, efficient and portable heating effect by applying a low-voltage power supply conversion electromagnetic heating circuit, which is suitable for personal daily care use. The design is innovative and practical, and is expected to be widely recognized and applied in the market.

[0043] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A low voltage power supply conversion electromagnetic heating circuit for generating heat inside an electric heating comb, characterized in that: The electromagnetic heating circuit comprises: An MCU circuit, an electromagnetic heating circuit and a current amplifying circuit, wherein the MCU circuit, the electromagnetic heating circuit and the current amplifying circuit are connected in sequence and perform current transmission; The first connection terminal provided on the MCU circuit is connected to the second connection terminal provided on the electromagnetic heating circuit, the third connection terminal provided on the electromagnetic heating circuit is connected to the fourth connection terminal provided on the current amplifying circuit, and the fifth connection terminal provided on the current amplifying circuit is connected to the sixth connection terminal provided on the MCU circuit; The MCU chip provided in the MCU circuit outputs the generated PWM signal to the second connection end through the first connection end, the electromagnetic heating circuit outputs the magnetic field heating sampling current to the fourth connection end through the third connection end, the current amplifying circuit outputs the amplified electrical signal to the sixth connection end through the fifth connection end, and the MCU circuit inputs the received amplified electrical signal to the MCU chip through the sixth connection end; An electromagnetic module is arranged in the electromagnetic heating circuit, and the electromagnetic module comprises a heating coil and a metal sheet. The electromagnetic module generates electromagnetic conversion through the heating coil and the metal sheet to perform heating, and a gap is arranged between the heating coil and the metal sheet.

2. The low voltage power supply conversion electromagnetic heating circuit according to claim 1, characterized in that: A seventh capacitor is arranged in the electromagnetic module, one end of the seventh capacitor is connected to the drain of the first MOS tube and the second MOS tube, the gate of the second MOS tube is connected to the anode of the first diode, the gate of the first MOS tube is connected to the anode of the second diode, a thirty-first resistor and a nineteenth resistor are arranged between the anode of the second diode and the third connection end, and the anode of the second diode is grounded.

3. The low voltage power supply conversion electromagnetic heating circuit according to claim 2, characterized in that: The electromagnetic heating circuit also includes a third MOS tube, a fourth MOS tube, a fifth MOS tube and a sixth MOS tube, the second connection end is connected to the gate of the sixth MOS tube, the drain of the sixth MOS tube is connected to the gate of the fourth MOS tube, the drain of the fourth MOS tube is connected to the gate of the third MOS tube, the source of the third MOS tube is connected to the drain of the fifth MOS tube, and the source of the fifth MOS tube is grounded.

4. The low voltage power supply conversion electromagnetic heating circuit according to claim 1, characterized in that: The current amplification circuit includes a current amplification module, the input end of the current amplification module is connected to the fourth connection end, the output end of the current amplification module is connected to the fifth connection end, a twelfth resistor is arranged between the fifth connection end and the output end of the current amplification module, and the current amplification module is connected in parallel with the fifth resistor and the eighth resistor.

5. The low voltage power supply conversion electromagnetic heating circuit according to claim 4, characterized in that: The output end of the current amplifying module is connected to the bias module. The bias module includes a seventeenth resistor and an eighteenth resistor. The seventeenth resistor and the eighteenth resistor are connected in parallel and grounded at the same time.

6. The low voltage power supply conversion electromagnetic heating circuit according to claim 5, characterized in that: The current amplification module also includes a filtering module, which includes a thirteenth capacitor and a thirteenth resistor. The thirteenth resistor is arranged between the fourth connection end and the input end of the current amplification module, and the fourth connection end is connected to the thirteenth capacitor and grounded.

7. The low voltage power supply conversion electromagnetic heating circuit according to claim 3, characterized in that: The fifth MOS tube is a PMOS tube, and the first MOS tube, the second MOS tube, the third MOS tube, the fourth MOS tube and the sixth MOS tube are NMOS tubes.

8. The low voltage power supply conversion electromagnetic heating circuit according to claim 3, characterized in that: The electromagnetic heating circuit also includes a fourteenth capacitor and a twentieth resistor. The third connection end is grounded through the fourteenth capacitor, and the twentieth resistor is connected in series with the nineteenth resistor.

9. The low voltage power supply conversion electromagnetic heating circuit according to claim 2, characterized in that: The second diode is connected in parallel with the thirty-first resistor.

10. An electric heating comb, comprising the low-voltage power supply conversion electromagnetic heating circuit according to any one of claims 1 to 9, characterized in that: A power module is arranged in the electric heating comb, one end of the power module is connected to an external power supply, and the other end is connected to the first connection end through a power switch to input current. The electromagnetic heating circuit arranged in the low-voltage power supply conversion electromagnetic heating circuit performs electromagnetic conversion to generate heat and outputs it to the electric heating comb.

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