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CN-122005135-A - Pulse width modulation-based wireless brush head type electric toothbrush control method and system

CN122005135ACN 122005135 ACN122005135 ACN 122005135ACN-122005135-A

Abstract

The invention relates to the technical field of electric toothbrush control, in particular to a wireless brush head type electric toothbrush control method and system based on pulse width modulation. The method comprises the steps of firstly outputting an activated carrier signal to enable a receiving module to establish a working power supply, then outputting a transmitting control pulse to carry out pulse width modulation on the carrier signal, and demodulating the carrier signal to obtain a driving control signal by the receiving module after wireless transmission of a transmitting coil L1 and a receiving coil L2 so as to control the working of a light emitting module and realize the working time recording of a brush head.

Inventors

  • WANG XUEWU

Assignees

  • 中山市柏斯曼科技实业有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. The control method of the wireless brush head type electric toothbrush based on pulse width modulation is characterized by comprising the following steps of: a step of starting power supply, in which a power supply control signal is output to enable the transmitting module to enter a working state; The carrier activating step is to output an activating carrier signal and send the activating carrier signal to a receiving coil L2 in the brush head through a transmitting coil L1 so as to enable a receiving module to establish a working power supply; A pulse encoding step of outputting emission control pulses for characterizing the emission control data; a wireless modulation step of performing pulse width modulation on a carrier signal according to the transmission control pulse and transmitting the modulated carrier signal to the receiving coil L2 through the transmitting coil L1; a receiving and decoding step, namely extracting electric energy according to the induction signal received by the receiving coil L2 and demodulating the electric energy to obtain a driving control signal; And the light-emitting control step is to drive the corresponding light-emitting units in the light-emitting module to emit light according to the drive control signal.
  2. 2. The method according to claim 1, wherein the step of activating the carrier wave is performed before the step of pulse encoding, and wherein in the step of activating the carrier wave, an activated carrier wave signal is continuously output to enable the receiving module to establish an operating power supply, and the step of pulse encoding and the step of wireless modulating are performed after the receiving module enters an operating state.
  3. 3. The method of claim 1, wherein the pulse width modulation based wireless toothbrush is characterized in that the pulse width of the transmitting control pulse is 120 to 180 microseconds, the different data bits are represented by the time interval between two adjacent pulses, and the data bits are represented by 580 to 660 microseconds, and the data bits are represented by 0,900 to 1000 microseconds.
  4. 4. The method according to claim 3, wherein the light emission control data is five-bit control data, the first two bits are baud rate adaptive bits, and the second three bits are light emission control bits, and the corresponding driving control signal is generated according to the light emission control bits in the receiving and decoding step.
  5. 5. The method according to claim 1, further comprising a time recording step, after the light emitting control step, of outputting a feedback code during operation of the brush head, wherein the feedback code is forwarded by the transmitting module and then input to the control module, so that the control module can record the operation time of the brush head according to the feedback code.
  6. 6. A wireless head-type electric toothbrush control system based on pulse width modulation for implementing the method of any one of claims 1-5, the system comprising: the battery power supply module is used for providing power for the system; the control module is provided with a control signal output end for outputting emission control pulses and a power supply control signal output end for outputting power supply control signals; a transmitting module having a control signal input for receiving the transmit control pulse, a power supply control signal input for receiving the power supply control signal, and a carrier signal output for outputting a modulated carrier signal; the transmitting coil L1 is electrically connected with the carrier signal output end and is used for generating an alternating electromagnetic field according to the modulated carrier signal; the receiving coil L2 is arranged opposite to the transmitting coil L1 and forms an electromagnetic coupling structure and is used for receiving the alternating electromagnetic field and generating an induction signal; The receiving module is provided with a signal input end for receiving the induction signal and a driving signal output end for outputting a driving control signal, and the signal input end is electrically connected with the receiving coil L2; And the light emitting module is provided with a driving signal input end for receiving the driving control signal.
  7. 7. The pulse width modulation based wireless brush head type electric toothbrush control system of claim 6, wherein the transmitting module comprises a transmitting chip U3, the transmitting chip U3 having a transmitting control terminal tx_send for receiving the transmitting control pulse, a power supply control terminal tx_pwr_en for receiving the power supply control signal, and an antenna output terminal ANT for outputting the modulated carrier signal, the transmitting module further comprising a power supply control circuit electrically connected to a power supply terminal of the transmitting chip U3 for controlling a power supply state of the transmitting chip U3.
  8. 8. The pulse width modulation based wireless brush head type electric toothbrush control system according to claim 7, wherein the transmitting module further comprises a resonance matching circuit, the resonance matching circuit comprises a current limiting resistor R4, a first filter capacitor C5, a second filter capacitor C10 and a third filter capacitor C11, one end of the current limiting resistor R4 is electrically connected with the antenna output end ANT, the other end of the current limiting resistor R4 is electrically connected with the transmitting coil L1, and the first filter capacitor C5, the second filter capacitor C10 and the third filter capacitor C11 are respectively connected in parallel with two ends of the transmitting coil L1.
  9. 9. The pulse width modulation based wireless brush head type electric toothbrush control system according to claim 6, wherein the receiving module comprises a receiving chip U1 and a filter circuit, the receiving chip U1 has a signal input end for receiving the sensing signal and a driving signal output end for outputting the driving control signal, the filter circuit comprises a filter resistor R1 and a first filter capacitor C5, one end of the receiving coil L2 is electrically connected with one end of the filter resistor R1, the other end of the filter resistor R1 is electrically connected with the signal input end of the receiving chip U1, one end of the first filter capacitor C5 is electrically connected with the other end of the filter resistor R1, and the other end of the first filter capacitor C5 is grounded.
  10. 10. The pulse width modulation based wireless brush head type electric toothbrush control system according to claim 6, wherein the light emitting module comprises a first light emitting unit, a second light emitting unit, a third light emitting unit and a fourth light emitting unit, the first light emitting unit, the second light emitting unit, the third light emitting unit and the fourth light emitting unit are respectively and correspondingly connected with the driving signal output end, the transmitting coil L1 is arranged at a brush head connecting end of the toothbrush body, and the receiving coil L2 is arranged at the bottom of the brush head.

Description

Pulse width modulation-based wireless brush head type electric toothbrush control method and system Technical Field The invention relates to the technical field of electric toothbrush control, in particular to a wireless brush head type electric toothbrush control method and system based on pulse width modulation. Background Along with the development of electric toothbrush products to intelligent and multifunctional directions, a light emitting device is arranged in a brush head to realize working mode prompt, tooth brushing state prompt and replacement prompt, so that the electric toothbrush has become more common product demands. In the prior art, the brush head side light emitting device is typically connected to a control circuit in the toothbrush body through a wire, a spring terminal or a conductive contact to obtain power and receive a control signal. However, since the brush head itself needs to have a detachable, replaceable and waterproof structure, a wire connection or a contact connection is provided between the brush head and the toothbrush body, which easily causes problems of complicated structure, difficulty in assembly, reduced sealability and poor contact after long-term use. In order to solve the problem of wire connection, some structures adopt an electromagnetic coupling mode to transmit electric energy to the brush head, so that wireless power supply is realized. However, existing wireless power supply schemes typically focus mainly on the energy transmission itself, and there is an inadequate consideration of how to synchronize the transmission of control information in the same wireless transmission link. As a result, although the brush head can obtain the operating electric energy, it is difficult to finely control the brush head light state according to the brush body side control logic, and particularly, it is difficult to realize functions such as switching of different light modes, combined light emission control, and brush head use state feedback recording. Therefore, a new control method and system are needed, so that the brush head side can not only obtain the working electric energy, but also stably receive the control information under the condition that no wire connection is arranged, and further realize the fine control of the brush head light state and the record of the brush head working time. The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art. Disclosure of Invention The invention aims to provide a wireless brush head type electric toothbrush control method and system based on pulse width modulation, aiming at the defects of the prior art. The wireless brush head type electric toothbrush control method based on pulse width modulation comprises the following steps of outputting a power supply control signal to enable a transmitting module to enter a working state, outputting an activating carrier signal, sending the activating carrier signal to a receiving coil L2 in a brush head through a transmitting coil L1 to enable the receiving module to establish a working power supply, outputting a transmitting control pulse after the receiving module enters the working state, enabling the transmitting module to conduct pulse width modulation on the carrier signal according to the transmitting control pulse, sending the modulated carrier signal to the receiving coil L2 through the transmitting coil L1, extracting electric energy according to an induction signal received by the receiving coil L2 and completing decoding processing to generate a driving control signal, and enabling a light emitting module to drive a corresponding light emitting unit to emit light according to the driving control signal. The invention also provides a wireless brush head type electric toothbrush control system based on pulse width modulation, which comprises a battery power supply module, a control module, a transmitting coil L1, a receiving coil L2, a receiving module and a light emitting module. The system comprises a battery power supply module, a control module, a transmitting coil L1, a receiving coil L2, a light-emitting module and a light-emitting module, wherein the battery power supply module is used for providing power for the system, the control module is used for outputting a transmitting control pulse and a power supply control signal, the transmitting module is used for receiving the transmitting control pulse and the power supply control signal and outputting a modulated carrier signal, the transmitting coil L1 is used for generating an alternating electromagnetic field according to the modulated carrier signal, the receiving coil L2 is used for receiving the alternating electromagnetic field and generating an induction signal, the receiving module is used for extracting electric energy according to the induction signal and gener