CN107565963B - High-frequency-precision high-linearity atomizing sheet control circuit - Google Patents
High-frequency-precision high-linearity atomizing sheet control circuit Download PDFInfo
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- CN107565963B CN107565963B CN201710661956.XA CN201710661956A CN107565963B CN 107565963 B CN107565963 B CN 107565963B CN 201710661956 A CN201710661956 A CN 201710661956A CN 107565963 B CN107565963 B CN 107565963B
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Abstract
The invention discloses a high-frequency-precision high-linearity atomizing sheet control circuit which comprises a PLL unit, a control unit and an atomizing sheet unit, wherein the PLL unit receives a control signal of the control unit to generate a specific-frequency square wave, the control unit receives a voltage signal generated by an atomizing sheet to generate a control signal, and the atomizing sheet unit receives the square wave generated by the PLL unit to drive and output a voltage signal. The invention can use a method with small steps, high accuracy and high linearity to more accurately search the optimal resonance frequency of the atomizing plate and ensure the best atomizing efficiency.
Description
Technical Field
The invention belongs to the technical field of integrated circuits, and particularly relates to a control circuit and a control method for an atomization sheet.
Background
The ultrasonic atomizer utilizes high-frequency oscillation (oscillation frequency is 1.7MHz or 2.4MHz, which exceeds the hearing range of human, the electronic oscillation has no harm to human body and animals), and breaks up water and other liquid through high-frequency resonance of the ceramic atomizing sheet to generate naturally elegant water mist without heating or adding any chemical reagent. Compared with the heating atomization mode, the energy is saved by 90 percent. But the atomizing sheet is characterized in that: the best atomization effect can be generated only at the resonance point, the driving frequency slightly deviates from the resonance point, and the atomization amount is sharply reduced. At present, the method of generating the driving frequency by using the RC oscillator in the industry has low frequency adjustment precision, is greatly influenced by process deviation and temperature, and the frequency is easy to deviate from a resonance point.
The high-precision high-linearity adjustment is realized in the range from 1.5MHz to 4.5MHz, the frequency change with the stepping precision smaller than 2KHz is achieved, more than 1000 steps of adjustment are needed, the existing capacitance adjusting mode inevitably needs larger capacitance, and the cost is obviously increased in a chip.
For example, patent application 201510477493.2 discloses a high-precision frequency sweep circuit for an ultrasonic atomization plate, which comprises a booster circuit and a frequency sweep circuit, wherein the booster circuit is electrically connected with the frequency sweep circuit, and a frequency sweep method based on the frequency sweep circuit is provided, which comprises the steps of inputting a fixed direct current voltage and a fixed frequency to the booster circuit; inputting frequency drive to a frequency sweeping circuit; recording the voltage value of a voltage feedback point of the booster circuit; increasing the input frequency to the frequency sweep circuit; and recording the voltage value of a voltage feedback point of the booster circuit, judging whether the frequency input to the frequency sweeping circuit reaches a rated value, if so, ending scanning, analyzing the recorded voltage value, and finding out the central frequency of the atomizing sheet, otherwise, entering the previous step. The invention is suitable for measuring and driving the frequency of various ultrasonic atomization pieces; the peak measurement based on pulse signals is not needed, so that megahertz ultrasonic atomization sheet frequency scanning can be performed; the atomization pieces of different models do not need to be compensated differently, and any ultrasonic atomization piece can be driven. However, the patent application uses the atomizing sheet scanning circuit to scan and control the frequency, and cannot solve the defect that the capacitance adjusting mode increases the cost.
In summary, the conventional RC circuit driving frequency generation method is difficult to implement with high precision frequency control due to area and structure constraints.
Disclosure of Invention
Based on this, it is therefore a primary object of the present invention to provide a high frequency accuracy high linearity atomizer plate control circuit that uses a phase locked loop to generate a high accuracy high linearity, small step atomizer plate drive frequency.
Another object of the present invention is to provide a high-frequency-precision high-linearity control circuit for an atomizing sheet, which realizes frequency configurability through a sigma-delta phase-locked loop, and realizes high-precision and high-linearity adjustment to accurately control the atomizing sheet to operate at a resonance point.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a high-frequency-precision high-linearity atomizing sheet control circuit comprises a PLL unit, a control unit and an atomizing sheet unit, wherein the PLL unit receives a control signal of the control unit to generate a specific-frequency square wave, the control unit receives a voltage signal generated by an atomizing sheet to generate a control signal, and the atomizing sheet unit receives the square wave generated by the PLL unit to drive and output a voltage signal.
The frequency range of the PLL unit output after frequency division can be set to be 1.5 MHz-4.5 MHz, and the PLL unit is used for driving atomization pieces of different models.
Further, the PLL unit includes: PFD unit, CP unit, LPF unit, VCO unit and sigma-delta divider unit; the PFD unit, the CP unit, the LPF unit and the VCO unit are sequentially connected, the PFD unit is connected with a Fref reference frequency and a divider frequency division frequency to generate a pulse signal, the CP unit is connected with the pulse signal of the PFD unit to generate charge and discharge currents, the LPF unit receives the charge and discharge currents of the PFD unit to generate a voltage signal, the VCO receives the voltage signal of the LPF unit to generate a corresponding frequency, and the sigma-delta divider unit is connected with the output frequency of the VCO unit to generate a frequency division frequency and output the frequency division frequency to the PFD unit.
The control unit outputs a control signal to act on the sigma-delta divider (programmable divider), and configures the frequency dividing ratio of the third-order sigma-delta divider to adjust the output frequency.
Further, the programmable frequency divider algorithmically controls the frequency dividing coefficient of the programmable frequency divider to change according to a certain rule (div _ int is a configured integer frequency dividing system), so that the output frequency of the final Fvco is as follows:
the circuit realized by the invention can use a method of small stepping, high accuracy and high linearity to more accurately search the optimal resonant frequency of the atomizing sheet and ensure the best atomizing efficiency.
The invention enables the sigma-delta divider unit to generate the frequency with the step less than 2KHz in the output frequency range of 1.5 MHz-4.5 MHz in a segmented frequency division mode, and the optimal resonant frequency of the atomizing plate can be more accurately searched by small step and high linearity, thereby ensuring the best atomizing efficiency.
Drawings
Fig. 1 is a circuit diagram of an implementation of the present invention.
Fig. 2 is a schematic diagram of a PLL unit implemented in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the high-frequency-accuracy high-linearity atomizing sheet control circuit implemented by the invention comprises a PLL unit, a control unit and an atomizing sheet unit, wherein the PLL unit receives a control signal of the control unit to generate a square wave with a specific frequency. The control unit receives the voltage signal generated by the atomizing sheet and generates a control signal. The atomization plate unit receives square wave drive generated by the PLL unit and outputs a voltage signal.
The frequency range of the output of the PLL unit after frequency division can be set to 1.5MHz to 4.5MHz, and the PLL unit is used for driving atomizing plates of different models. When the atomization plate works at the resonance point, a specific voltage value is generated, when the output voltage value of the atomization plate changes, the oscillation frequency deviates from the optimal resonance point, the voltage generated by the atomization plate is calculated and compared by the control unit, and a group of control signals are output to enable the output frequency of the PLL unit to be adjusted to the optimal resonance frequency again.
The PLL unit of this embodiment, as shown in fig. 2, includes: PFD unit, CP unit, LPF unit, VCO unit, sigma-delta divider unit. The PFD unit is connected with a Fref reference frequency and a divider frequency division frequency to generate a pulse signal. The CP unit is connected with the pulse signal of the PFD unit to generate the charging and discharging current. The LPF unit receives the impulse and discharge current of the PFD unit to generate a voltage signal. The VCO receives the voltage signal of the LPF unit to generate a corresponding frequency. The sigma-delta divider unit is connected with the output frequency of the VCO unit to generate the frequency division frequency.
The control unit outputs a control signal to act on the sigma-delta divider (programmable divider), and configures a frequency division ratio of the third-order sigma-delta divider to adjust the output frequency, and the programmable divider is used for controlling a frequency division coefficient of the programmable divider to change according to a certain rule through an algorithm (div _ int is a configured integer frequency division system), so that the output frequency of the final Fvco is in the following relationship:
as can be seen by the equation, every increment and decrement of div _ frac, the Fvco varies by 244Hz frequency, much less than the 2KHz step requirement.
The circuit realized by the invention can use a method of small stepping, high accuracy and high linearity to more accurately search the optimal resonant frequency of the atomizing sheet and ensure the best atomizing efficiency.
The invention enables the sigma-delta divider unit to generate the frequency with the step less than 2KHz in the output frequency range of 1.5 MHz-4.5 MHz in a segmented frequency division mode, and the optimal resonant frequency of the atomizing plate can be more accurately searched by small step and high linearity, thereby ensuring the best atomizing efficiency.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A high-frequency-precision high-linearity atomizing sheet control circuit is characterized by comprising a PLL unit, a control unit and an atomizing sheet unit, wherein the PLL unit receives a control signal of the control unit to generate a square wave with a specific frequency, the control unit receives a voltage signal generated by the atomizing sheet unit to generate a control signal, and the atomizing sheet unit receives the square wave generated by the PLL unit to drive and output a voltage signal.
2. The high frequency accuracy high linearity chip control circuit according to claim 1, wherein the frequency range of the output of said PLL unit after frequency division is set to 1.5MHz to 4.5MHz for driving different types of chips.
3. The high frequency accuracy high linearity chip control circuit according to claim 2, wherein said PLL unit includes: PFD unit, CP unit, LPF unit, VCO unit and sigma-delta divider unit; the PFD unit, the CP unit, the LPF unit and the VCO unit are sequentially connected, the PFD unit is connected with a Fref reference frequency and a frequency division frequency of the sigma-delta divider unit to generate a pulse signal, the CP unit is connected with the pulse signal of the PFD unit to generate charge and discharge currents, the LPF unit receives the charge and discharge currents of the PFD unit to generate a voltage signal, the VCO receives the voltage signal of the LPF unit to generate a corresponding frequency, and the sigma-delta divider unit is connected with an output frequency of the VCO unit to generate a frequency division frequency and output the frequency division frequency to the PFD unit.
4. The high frequency accuracy high linearity atomizer patch control circuit of claim 3 wherein said control unit outputs a control signal to said sigma-delta divider unit to configure the division ratio of said third order sigma-delta divider unit to adjust the output frequency.
5. The high frequency accuracy high linearity atomizer chip control circuit of claim 1 wherein the sigma-delta divider unit algorithmically controls the division factor of the programmable divider to vary according to a certain rule such that the final fvcoThe output frequency of (d) is as follows:
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4642581A (en) * | 1985-06-21 | 1987-02-10 | Sono-Tek Corporation | Ultrasonic transducer drive circuit |
| CN102006035A (en) * | 2010-10-26 | 2011-04-06 | 深圳和而泰智能控制股份有限公司 | Ultrasonic control circuit and device thereof |
| CN105358200A (en) * | 2013-07-09 | 2016-02-24 | 皇家飞利浦有限公司 | Ultrasonic measurements for monitoring patients using respiratory therapy delivery devices |
| CN105392513A (en) * | 2013-07-09 | 2016-03-09 | 皇家飞利浦有限公司 | Ultrasonic energy measurements in respiratory drug delivery devices |
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- 2017-08-04 CN CN201710661956.XA patent/CN107565963B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4642581A (en) * | 1985-06-21 | 1987-02-10 | Sono-Tek Corporation | Ultrasonic transducer drive circuit |
| CN102006035A (en) * | 2010-10-26 | 2011-04-06 | 深圳和而泰智能控制股份有限公司 | Ultrasonic control circuit and device thereof |
| CN105358200A (en) * | 2013-07-09 | 2016-02-24 | 皇家飞利浦有限公司 | Ultrasonic measurements for monitoring patients using respiratory therapy delivery devices |
| CN105392513A (en) * | 2013-07-09 | 2016-03-09 | 皇家飞利浦有限公司 | Ultrasonic energy measurements in respiratory drug delivery devices |
Non-Patent Citations (1)
| Title |
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| "一种基于 IMT-2000 标准的 Fractional-N 频率合成器设计";汪洋;《中国优秀硕士学位论文全文数据库 信息科技辑》;20130415(第04期);第4，11，28页 * |
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