A radio frequency circuit applied to an electric toothbrush and the electric toothbrush

Abstract

The application discloses a radio frequency circuit applied to an electric toothbrush and the electric toothbrush, and relates to the field of toothbrush cleaning. The radio frequency circuit comprises a pull-up resistor R1, a pull-down resistor R2, a pull-up resistor R3, a pull-down resistor R4, a charge-discharge capacitor C1, a charge-discharge capacitor C2, a charge-discharge capacitor C3, a switch tube Q1, an inductor L1, a step-up transformer L2, a terminal J1 and a radio frequency electrode piece. The step-up transformer L2 comprises a step-up transformer primary coil L21 and a step-up transformer secondary coil L22. The first pin and the second pin of the terminal J1 are connected to the positive and negative poles of the radio frequency electrode piece respectively and generate an oscillation waveform with positive and negative poles alternately. The radio frequency circuit applied to the electric toothbrush and the electric toothbrush disclosed by the application can further clean stubborn tooth stains and dental calculus on teeth on the basis of brushing off food residues and dental plaque.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of toothbrush cleaning, in particular to a radio frequency circuit applied to an electric toothbrush and an electric toothbrush. BACKGROUND

[0002] With the popularization of various electric toothbrush products, the cleaning effect of the electric toothbrush is paid more and more attention, but the cleaning effect of the ordinary electric toothbrush is not very ideal, especially for the cleaning of stubborn tooth stains and dental calculus, there is no great effect, and there are often cleaning blind spots such as interdental spaces and gum lines. However, if the interdental spaces and gum lines of the oral teeth are not cleaned, a large amount of food residues will be left in these places, which will become a breeding ground for bacteria, and the bacteria will secrete a large amount of acid and other substances to corrode the enamel, and finally cause dental caries. At the same time, dental calculus is easy to form at the root of the tooth, which not only affects the appearance, but more importantly, will cause gum recession, easy bleeding, tooth loosening, and a series of problems such as gaps between teeth. SUMMARY

[0003] The purpose of the present application is to provide a radio frequency circuit applied to an electric toothbrush and an electric toothbrush, which can further clean stubborn tooth stains and dental calculus on the teeth on the basis of brushing off food residues and dental plaque.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0005] A radio frequency circuit applied to an electric toothbrush, the radio frequency circuit comprising: a pull-up resistor R1, a pull-down resistor R2, a pull-up resistor R3, a pull-down resistor R4, a charge and discharge capacitor C1, a charge and discharge capacitor C2, a charge and discharge capacitor C3, a switch tube Q1, an inductor L1, a step-up transformer L2, a terminal J1 and a radio frequency electrode piece; the step-up transformer L2 comprises a step-up transformer primary coil L21 and a step-up transformer secondary coil L22;

[0006] One end of the pull-up resistor R1 is connected to the power supply VCC; the other end of the pull-up resistor R1 is connected to one end of the pull-down resistor R2, one end of the charge-discharge capacitor C1 and the base of the switch tube Q1 respectively; the other end of the pull-down resistor R2 is grounded; one end of the pull-up resistor R3 is connected to the power supply VCC; the other end of the pull-up resistor R3 is connected to the collector of the switch tube Q1, one end of the charge-discharge capacitor C2, one end of the inductor L1 and one end of the primary coil L21 of the step-up transformer respectively; the emitter of the switch tube Q1 is connected to one end of the pull-down resistor R4, the other end of the charge-discharge capacitor C2 and one end of the charge-discharge capacitor C3 respectively; the other end of the pull-down resistor R4 is grounded; the other end of the charge-discharge capacitor C3 is connected to the other end of the charge-discharge capacitor C1, the other end of the inductor L1 and the other end of the primary coil L21 of the step-up transformer respectively; one end of the secondary coil L22 of the step-up transformer is connected to the first pin of the terminal J1; the other end of the secondary coil L22 of the step-up transformer is connected to the second pin of the terminal J1; the first pin and the second pin of the terminal J1 are connected to the positive and negative poles of the radio frequency electrode piece respectively.

[0007] Optionally, the resistance value of the pull-up resistor R1 is much larger than the resistance value of the pull-up resistor R3; the resistance value of the pull-down resistor R2 is much larger than the resistance value of the pull-down resistor R4.

[0008] Optionally, the resistance value of the pull-up resistor R1 is larger than the resistance value of the pull-down resistor R2; the resistance value of the pull-up resistor R3 is larger than the resistance value of the pull-down resistor R4.

[0009] Optionally, the capacitance value of the charge-discharge capacitor C1 and the capacitance value of the charge-discharge capacitor C2 are both much smaller than the capacitance value of the charge-discharge capacitor C3.

[0010] Optionally, the charge-discharge capacitor C1 is used for controlling the switching frequency of the switch tube Q1.

[0011] Optionally, the combination of the inductor L1 and the primary coil L21 of the step-up transformer and the charge-discharge capacitor C2 and the charge-discharge capacitor C3 together constitute an LC oscillation circuit.

[0012] Optionally, the positive and negative poles of the radio frequency electrode piece are conductively connected through conductive silica gel.

[0013] Optionally, an electric toothbrush comprises the radio frequency circuit.

[0014] According to the specific embodiments provided by the application, the following technical effects are disclosed:

[0015] The application provides a radio frequency circuit applied to an electric toothbrush and the electric toothbrush. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0017] Figure 1 The radio frequency circuit applied to the electric toothbrush of the present application is shown in the figure. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0019] The present application aims to provide a radio frequency circuit applied to an electric toothbrush and the electric toothbrush, which can further clean stubborn stains and calculus on teeth on the basis of brushing off food residues and dental plaque.

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail with reference to the drawings and specific embodiments.

[0021] Figure 1 The radio frequency circuit applied to the electric toothbrush of the present application is shown in the figure. Figure 1As shown, a radio frequency circuit applied to an electric toothbrush, comprising: a pull-up resistor R1, a pull-down resistor R2, a pull-up resistor R3, a pull-down resistor R4, a charge-discharge capacitor C1, a charge-discharge capacitor C2, a charge-discharge capacitor C3, a switch tube Q1, an inductor L1, a step-up transformer L2, a terminal J1 and a radio frequency electrode piece. The step-up transformer L2 is a step-up transformer with a ratio of N, comprising a step-up transformer primary coil L21 and a step-up transformer secondary coil L22.

[0022] The connection relationship between the components in the radio frequency circuit is as follows:

[0023] One end of the pull-up resistor R1 is connected to a power supply VCC, and the other end is connected to one end of the pull-down resistor R2, one end of the charge-discharge capacitor C1 and the base of the switch tube Q1, respectively. The other end of the pull-down resistor R2 is grounded, wherein the charge-discharge capacitor C1 is used to control the switching frequency of the switch tube Q1, the resistance value of the pull-up resistor R1 is greater than that of the pull-down resistor R2, and the switch tube Q1 is a switching triode.

[0024] One end of the pull-up resistor R3 is connected to the power supply VCC, and the other end is connected to the collector of the switch tube Q1, one end of the charge-discharge capacitor C2, one end of the inductor L1 and one end of the step-up transformer primary coil L21, respectively. The emitter of the switch tube Q1 is connected to one end of the pull-down resistor R4, the other end of the charge-discharge capacitor C2 and one end of the charge-discharge capacitor C3, respectively. The other end of the pull-down resistor R4 is grounded, wherein the resistance value of the pull-up resistor R3 is greater than that of the pull-down resistor R4.

[0025] Preferably, the resistance value of the pull-up resistor R1 is much greater than that of the pull-up resistor R3, and the resistance value of the pull-down resistor R2 is much greater than that of the pull-down resistor R4.

[0026] The other end of the charge-discharge capacitor C3 is connected to the other end of the charge-discharge capacitor C1, the other end of the inductor L1 and the other end of the step-up transformer primary coil L21, respectively. One end of the step-up transformer secondary coil L22 is connected to the first pin of the terminal J1, and the other end is connected to the second pin of the terminal J1.

[0027] Preferably, the combination of the inductor L1 and the step-up transformer primary coil L21, together with the charge-discharge capacitor C2 and the charge-discharge capacitor C3, forms an LC oscillation circuit. The capacitance value of the charge-discharge capacitor C1 and the capacitance value of the charge-discharge capacitor C2 are both much smaller than the capacitance value of the charge-discharge capacitor C3.

[0028] The first pin and the second pin of the terminal J1 are respectively connected to the positive and negative electrodes of the radio frequency electrode piece, and the positive and negative electrodes of the radio frequency electrode piece are conductively connected through conductive silicone.

[0029] The working principle of the radio frequency circuit is as follows:

[0030] 1) When the radio frequency circuit is just powered on, the pull-up resistor R1 and the pull-down resistor R2 form a voltage divider circuit, wherein the voltage U1 on the pull-down resistor R2 controls the switch of the switch tube Q1, and because the pull-up resistor R1 is greater than the pull-down resistor R2, the voltage U1 on the pull-down resistor R2 can be regarded as a low level, and the switch tube Q1 is closed.

[0031] 2) At this time, the current flows from the power supply VCC, passes through the pull-up resistor R3 to the other end of the pull-up resistor R3, and the voltage at the other end of the pull-up resistor R3 is U2, so U2 is floating to the entire circuit, and the voltage value of U2 is also the voltage value of the power supply VCC.

[0032] 3) The current from the other end of the pull-up resistor R3 passes through the inductor L1 and the primary coil L21 of the boost transformer to the other end of the inductor L1 quickly, and the voltage at the other end of the inductor L1 is U4, and because of the same principle as above, the voltage value of U4 is also the same as the voltage value of the power supply VCC.

[0033] 4) Because the voltage values of U2 and U4 are consistent, U2 is connected to one end of the charge-discharge capacitor C2, and U4 is connected to the other end of the charge-discharge capacitor C3, and the voltage at the connection point of the charge-discharge capacitor C2 and the charge-discharge capacitor C3 is U3, U3 is connected to ground through the pull-down resistor R4, at this time, the charge-discharge capacitor C2 is charged from top to bottom, and the charge-discharge capacitor C3 is charged from bottom to top; when the charge-discharge capacitor C2 and C3 are fully charged, the voltages at both ends of the charge-discharge capacitor C2 are consistent, and the voltages at both ends of the charge-discharge capacitor C3 are consistent, at this time, the voltage values of U2, U3 and U4 are consistent with the voltage value of the power supply VCC.

[0034] 5) The other end of the charge-discharge capacitor C1 is connected to U4, i.e. the voltage of the power supply VCC, and the voltage at one end of the charge-discharge capacitor C1 is the voltage U1 on the pull-down resistor R2 in the voltage divider circuit composed of the pull-up resistor R1 and the pull-down resistor R2, U1 is lower than the voltage of the power supply VCC, at this time, the charge-discharge capacitor C1 starts to charge from bottom to top.

[0035] 6) When the charge-discharge capacitor C1 is fully charged, the voltages at both ends of the charge-discharge capacitor C1 are consistent. At this time, the voltage value of the voltage U1 at one end of the charge-discharge capacitor C1 is consistent with the voltage value of the power supply VCC, which is regarded as a high level, and the switch tube Q1 is opened.

[0036] 7) Switching tube Q1 opens, the other end of pull-up resistor R3 is connected with one end of pull-down resistor R4, i.e. U2 is directly connected with U3, at this time, the voltage of U2 and U3 is the same, the both ends of charge-discharge capacitor C2 are directly short-circuited, at this time, U2 is the voltage of the voltage dividing circuit composed of pull-up resistor R3 and pull-down resistor R4. Due to the energy storage of inductor, the size of U4 remains unchanged, and the voltage value of U4 is consistent with the voltage value of power supply VCC, at this time, U2 is lower than U4, U3 is lower than U4, inductor L1, primary coil L21 of step-up transformer and charge-discharge capacitor C3 all start to perform reverse discharge, and a negative voltage waveform of voltage doubling is generated at secondary coil L22 of step-up transformer.

[0037] 8) When inductor L1, primary coil L21 of step-up transformer and charge-discharge capacitor C3 complete discharging, the voltage value of U3 and U4 is the voltage value of U3, the voltage U1 between the both ends of charge-discharge capacitor C1 is greater than U4, and charge-discharge capacitor C1 discharges through pull-down resistor R2.

[0038] 9) The voltage value of U1 tends to the voltage value of U4, at this time, the voltage U1 is low level, and switching tube Q1 is closed.

[0039] 10) After switching tube Q1 is closed, the direct connection between the other end of pull-up resistor R3 and one end of pull-down resistor R4 is disconnected, at this time, the voltage value of U2 becomes the voltage value of power supply VCC, U3 is low level by grounding through pull-down resistor R4, and U2 is greater than U4.

[0040] 11) Due to the principle that the voltage of inductor cannot be suddenly changed, inductor L1 and primary coil L21 of step-up transformer perform forward charging, and a positive voltage waveform of voltage doubling is generated at secondary coil L22 of step-up transformer.

[0041] 12) Because the voltage value of U2 is higher than the voltage value of U3, charge-discharge capacitor C2 performs forward charging, and because the capacitance value of charge-discharge capacitor C2 is small, it can be quickly charged, so that the voltage value of U3 quickly reaches the size of the voltage value of U2, and charge-discharge capacitor C2 plays a role of fast charging; because the voltage value of U3 is higher than the voltage value of U4, charge-discharge capacitor C3 performs forward charging; when charge-discharge capacitor C3, inductor L1 and primary coil L21 of step-up transformer are fully charged, the voltage value of U4 is equal to the voltage value of U2, i.e. the voltage value of U4 is also the voltage value of power supply VCC.

[0042] 13) Cycle back to step 5); it is always cycled, i.e. a positive and negative alternating oscillation waveform is generated at secondary coil L22 of step-up transformer.

[0043] Preferably, the frequency of the oscillation waveform can be adjusted by adjusting the capacitance of the charging and discharging capacitor C1. The amplitude of the oscillation waveform can also be adjusted by adjusting the capacitance of the charging and discharging capacitor C3 or adjusting the inductance of the inductor L1 and the inductance of the primary coil L21 of the step-up transformer.

[0044] Preferably, the separation of the inductor L1 and the primary coil L21 of the step-up transformer L2 is beneficial to the adjustment of the amplitude of the oscillation waveform and the selectivity of the step-up transformer L2, because the parameters of the step-up transformer L2 are relatively fixed.

[0045] Since one end of the secondary coil L22 of the step-up transformer is connected to the first pin of the terminal J1 and the other end is connected to the second pin of the terminal J1, and the first pin and the second pin of the terminal J1 are connected to the positive and negative poles of the RF electrode piece respectively, the positive and negative alternating oscillation waveform generated at the secondary coil L22 of the step-up transformer reaches the positive and negative poles of the RF electrode piece through the terminal J1, forming an RF voltage. Since the conductive silica gel connects the positive and negative poles of the RF electrode piece, an RF current is generated. The charged particles in the generated RF current are used to decompose dental stains and even dental plaque and calculus. Since RF has the characteristic of penetrating everywhere, it can reach the cleaning blind area of ordinary toothbrushes such as dental crevices and gum lines, greatly improving the efficiency of oral cleaning.

[0046] The RF circuit applied to the electric toothbrush and the electric toothbrush disclosed in the present application add the RF cleaning technology of the RF circuit on the basis of the existing sound wave vibration. Not only can they efficiently and intelligently brush off food residues and dental plaque like ordinary electric toothbrushes, but also can further clean stubborn dental stains and calculus on teeth.

[0047] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0048] The principles and implementation manners of the present application are described by using specific examples in the present text. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A radio frequency circuit applied to an electric toothbrush, characterized by, The radio frequency circuit comprises a pull-up resistor R1, a pull-down resistor R2, a pull-up resistor R3, a pull-down resistor R4, a charge-discharge capacitor C1, a charge-discharge capacitor C2, a charge-discharge capacitor C3, a switch tube Q1, an inductor L1, a step-up transformer L2, a terminal J1 and a radio frequency electrode piece; the step-up transformer L2 comprises a step-up transformer primary coil L21 and a step-up transformer secondary coil L22. One end of the pull-up resistor R1 is connected to a power supply VCC; the other end of the pull-up resistor R1 is connected to one end of the pull-down resistor R2, one end of the charge-discharge capacitor C1 and a base of the switch tube Q1 respectively; the other end of the pull-down resistor R2 is grounded; one end of the pull-up resistor R3 is connected to the power supply VCC; the other end of the pull-up resistor R3 is connected to a collector of the switch tube Q1, one end of the charge-discharge capacitor C2, one end of the inductor L1 and one end of the step-up transformer primary coil L21 respectively; an emitter of the switch tube Q1 is connected to one end of the pull-down resistor R4, the other end of the charge-discharge capacitor C2 and one end of the charge-discharge capacitor C3 respectively; the other end of the pull-down resistor R4 is grounded; the other end of the charge-discharge capacitor C3 is connected to the other end of the charge-discharge capacitor C1, the other end of the inductor L1 and the other end of the step-up transformer primary coil L21 respectively; one end of the step-up transformer secondary coil L22 is connected to a first pin of the terminal J1; the other end of the step-up transformer secondary coil L22 is connected to a second pin of the terminal J1; the first pin and the second pin of the terminal J1 are connected to positive and negative poles of the radio frequency electrode piece respectively, and the positive and negative poles of the radio frequency electrode piece are conductively connected through conductive silicone.

2. The RF circuit for use in an electric toothbrush according to claim 1, wherein The resistance value of the pull-up resistor R1 is much greater than the resistance value of the pull-up resistor R3; the resistance value of the pull-down resistor R2 is much greater than the resistance value of the pull-down resistor R4.

3. The RF circuit applied to an electric toothbrush according to claim 1, wherein The resistance value of the pull-up resistor R1 is greater than the resistance value of the pull-down resistor R2; the resistance value of the pull-up resistor R3 is greater than the resistance value of the pull-down resistor R4.

4. The RF circuit for use in an electric toothbrush according to claim 1, wherein The capacitance value of the charge-discharge capacitor C1 and the capacitance value of the charge-discharge capacitor C2 are both much smaller than the capacitance value of the charge-discharge capacitor C3.

5. The RF circuit for use in an electric toothbrush according to claim 1, wherein The charge-discharge capacitor C1 is used for controlling the switching frequency of the switch tube Q1.

6. The RF circuit for use in an electric toothbrush according to claim 1, wherein The combination of the inductor L1 and the step-up transformer primary coil L21, together with the charge-discharge capacitor C2 and the charge-discharge capacitor C3, constitutes an LC oscillation circuit.

7. An electric toothbrush characterized by comprising: The radio frequency circuit comprises: The radio frequency circuit according to any one of claims 1-6.

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