WO2019113789A1 - Frequency locking circuit and control method therefor - Google Patents

Frequency locking circuit and control method therefor Download PDF

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WO2019113789A1
WO2019113789A1 PCT/CN2017/115712 CN2017115712W WO2019113789A1 WO 2019113789 A1 WO2019113789 A1 WO 2019113789A1 CN 2017115712 W CN2017115712 W CN 2017115712W WO 2019113789 A1 WO2019113789 A1 WO 2019113789A1
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circuit
frequency
control
voltage drop
drop value
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PCT/CN2017/115712
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French (fr)
Chinese (zh)
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杨明
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深圳和而泰数据资源与云技术有限公司
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Priority to PCT/CN2017/115712 priority Critical patent/WO2019113789A1/en
Publication of WO2019113789A1 publication Critical patent/WO2019113789A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0653Details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/88Electrical aspects, e.g. circuits
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03BGENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/20Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator

Abstract

A frequency locking circuit and a control method therefor. The frequency locking circuit comprises: a switch circuit (101), a sampling circuit (102), a controller (103), and an oscillating circuit (104). An input end (101b) of the switch circuit (101) is connected to the oscillating circuit (104); an output end (101c) of the switch circuit (101) is connected to a first end of the sampling circuit (102); a control signal output end of the controller (103) is connected to a control end (101a) of the switch circuit (101); a detection signal input end of the controller (103) is respectively connected to the output end (101c) of the switch circuit (101) and the first end of the sampling circuit (102); a second end of the sampling circuit (102) is grounded. The controller (103) is configured to: control on/off of the switch circuit (101) according to a preset control frequency band, detect a voltage drop value corresponding to the sampling circuit (102), obtain a control frequency corresponding to the maximum voltage drop value, and lock the obtained control frequency to control on/off of the switch circuit (101). The frequency locking circuit can lock the oscillating circuit at a resonance frequency.

Description

一种锁频电路及其控制方法Frequency locking circuit and control method thereof 技术领域Technical field

本申请实施例涉及电子电路技术领域,尤其涉及一种锁频电路及其控制方法。The embodiments of the present invention relate to the field of electronic circuit technologies, and in particular, to a frequency locking circuit and a control method thereof.

背景技术Background technique

加湿设备通常是由控制器控制的包含雾化片的振荡电路组成,其加湿原理是,通过雾化片的高频振荡性质,将液态水分子结构打散而产生超微粒子和负氧离子的水雾。The humidifying device is usually composed of an oscillating circuit including a atomizing sheet controlled by a controller. The humidifying principle is that the liquid water molecular structure is broken up by the high frequency oscillating property of the atomizing sheet to generate ultrafine particles and negative oxygen ions. fog.

在实际应用中,由于雾化片在水中长期使用后容易引起其参数发生变化,或者由于电路元件参数误差等原因,都会造成控制器输出控制振荡电路的谐振频率发生偏离,从而造成雾化片的喷雾效果变差。In practical applications, due to the long-term use of the atomized sheet in the water, it is easy to cause its parameter to change, or due to the parameter error of the circuit component, etc., the resonance frequency of the controller output control oscillation circuit will be deviated, resulting in the atomization sheet. The spray effect is worse.

发明内容Summary of the invention

本申请的目的在于提供一种锁频电路及其控制方法,用于解决谐振频率容易偏离,使得振荡电路无法处于谐振状态的问题。The purpose of the present application is to provide a frequency locking circuit and a control method thereof for solving the problem that the resonant frequency is easily deviated, so that the oscillating circuit cannot be in a resonant state.

为实现上述目的,第一方面,本申请实施例提供一种锁频电路,所述锁频电路包括:开关电路、采样电路、控制器以及振荡电路,To achieve the above objective, in a first aspect, an embodiment of the present application provides a frequency locking circuit, where the frequency locking circuit includes: a switching circuit, a sampling circuit, a controller, and an oscillating circuit.

所述开关电路的输入端连接所述振荡电路,所述开关电路的输出端连接所述采样电路的第一端,所述控制器的控制信号输出端连接所述开关电路的控制端,所述控制器的检测信号输入端分别连接所述开关电路的输出端和所述采样电路的第一端,所述采样电路的第二端接地;An input end of the switch circuit is connected to the oscillating circuit, an output end of the switch circuit is connected to a first end of the sampling circuit, and a control signal output end of the controller is connected to a control end of the switch circuit, The detection signal input end of the controller is respectively connected to the output end of the switch circuit and the first end of the sampling circuit, and the second end of the sampling circuit is grounded;

其中,所述控制器用于:按预设控制频段控制所述开关电路的通断,并检测所述采样电路对应的压降值,获取最大压降值所对应的控制频率,锁定按获取到的所述控制频率控制所述开关电路的通断。The controller is configured to: control the on/off of the switch circuit according to a preset control frequency band, and detect a voltage drop value corresponding to the sampling circuit, obtain a control frequency corresponding to the maximum voltage drop value, and lock the acquired The control frequency controls on and off of the switching circuit.

可选地,所述采样电路为采样电阻。Optionally, the sampling circuit is a sampling resistor.

可选地,所述开关电路包括:第一电阻、第二电阻以及开关管; Optionally, the switch circuit includes: a first resistor, a second resistor, and a switch tube;

所述第一电阻的一端连接所述控制器的控制信号输出端,所述第一电阻的另一端分别连接所述第二电阻的一端和所述开关管的控制端;所述开关管的输入端连接所述振荡电路,所述开关管的输出端分别连接所述采样电路的第一端和所述控制器的检测信号输入端;所述第二电阻的另一端接地。One end of the first resistor is connected to a control signal output end of the controller, and the other end of the first resistor is respectively connected to one end of the second resistor and a control end of the switch tube; the input of the switch tube The end is connected to the oscillating circuit, and the output end of the switch tube is respectively connected to the first end of the sampling circuit and the detection signal input end of the controller; the other end of the second resistor is grounded.

可选地,所述振荡电路包括:第一电感、第二电感、第一电容、第二电容以及雾化片;Optionally, the oscillating circuit includes: a first inductor, a second inductor, a first capacitor, a second capacitor, and an atomizing sheet;

所述第一电感的一端连接电源,所述第一电感的另一端分别连接所述第一电容一端和所述开关电路的输入端;所述第一电容的另一端分别连接所述第二电感和第二电容;One end of the first inductor is connected to the power source, and the other end of the first inductor is respectively connected to one end of the first capacitor and an input end of the switch circuit; the other end of the first capacitor is respectively connected to the second inductor And a second capacitor;

所述雾化片的一端连接所述第二电感,其另一端连接所述第二电容,并接地。One end of the atomization piece is connected to the second inductor, and the other end is connected to the second capacitor and grounded.

可选地,还包括滤波电路,所述滤波电路包括:第三电阻和第三电容;Optionally, the method further includes a filter circuit, where the filter circuit includes: a third resistor and a third capacitor;

所述第三电阻的一端分别连接所述采样电路的第一端和所述开关管的输出端,所述第三电阻的另一端连接所述第三电容的一端和所述控制器的检测信号输入端;所述第三电容的另一端接地。One end of the third resistor is respectively connected to the first end of the sampling circuit and the output end of the switch tube, and the other end of the third resistor is connected to one end of the third capacitor and a detection signal of the controller An input end; the other end of the third capacitor is grounded.

第二方面,本申请实施例还提供一种锁频电路的控制方法,所述锁频电路为如上所述的锁频电路,所述方法包括:In a second aspect, the embodiment of the present application further provides a method for controlling a frequency locking circuit, where the frequency locking circuit is a frequency locking circuit as described above, and the method includes:

按预设控制频段控制所述开关电路的通断,并检测所述采样电路对应的压降值,获取最大压降值所对应的控制频率;Controlling the on/off of the switch circuit according to a preset control frequency band, and detecting a voltage drop value corresponding to the sampling circuit, and obtaining a control frequency corresponding to the maximum voltage drop value;

锁定按获取到的所述控制频率控制所述开关电路的通断。The lock controls the on and off of the switch circuit according to the acquired control frequency.

可选地,所述按预设控制频段控制所述开关电路的通断,并检测所述采样电路对应的压降值,获取最大压降值所对应的控制频率,具体包括:Optionally, the controlling the on/off of the switch circuit according to the preset control frequency band, and detecting the voltage drop value corresponding to the sampling circuit, and acquiring the control frequency corresponding to the maximum voltage drop value, specifically including:

步骤a、在预设控制频段内向所述开关电路输出第一振荡频率,并根据所述第一振荡频率获取所述采样电路的第一压降值,并保存所述第一振荡频率和所述第一压降值;Step a, outputting a first oscillation frequency to the switch circuit in a preset control frequency band, and acquiring a first voltage drop value of the sampling circuit according to the first oscillation frequency, and saving the first oscillation frequency and the First pressure drop value;

步骤b、按照预设频率差减小或增大所述第一振荡频率,得到第二振荡频率,并根据所述第二振荡频率获取所述采样电路的第二压降值;Step b: decreasing or increasing the first oscillation frequency according to a preset frequency difference to obtain a second oscillation frequency, and acquiring a second voltage drop value of the sampling circuit according to the second oscillation frequency;

步骤c、判断所述第二压降值是否大于所述第一压降值,如果是,将所述第二振荡频率和第二压降值替换已保存的所述第一振荡频率和第一压降值,直至得到预设控制频段内使得所述采样电路产生最大压降值所对应的控制频率。 Step c, determining whether the second voltage drop value is greater than the first voltage drop value, and if so, replacing the second oscillation frequency and the second voltage drop value with the saved first oscillation frequency and the first The voltage drop value is obtained until the preset control frequency band is obtained such that the sampling circuit generates a control frequency corresponding to the maximum voltage drop value.

可选地,所述预设控制频段为[f0(1-a%),f0(1+a%)],其中,f0指的是所述锁频电路中所述振荡电路的谐振频率,a为预设范围内的任意参数。Optionally, the preset control frequency band is [f 0 (1-a%), f 0 (1+a%)], where f 0 refers to a resonance of the oscillation circuit in the frequency locking circuit. Frequency, a is any parameter within the preset range.

在本申请实施例中,通过输出预设控制频段内的控制频率控制开关电路的通断,并且在开关电路按每一控制频率通断时,检测每一控制频率对应的采样电路的压降值,最后获取采样电路的最大压降值,根据该最大压降值获取对应的控制频率,从而能够使控制器根据该控制频率控制开关电路通断,使振荡电路锁定在谐振频率,维持谐振状态,由此,一方面,该实施方式节省了人工调试环节,节约了生产成本,提高了生产效率,另一方面,能够使具备该锁频电路的喷雾装置具备较好的喷雾效果,提升了用户体验。In the embodiment of the present application, the switching of the switching circuit is controlled by outputting the control frequency in the preset control frequency band, and when the switching circuit is turned on and off for each control frequency, the voltage drop value of the sampling circuit corresponding to each control frequency is detected. Finally, the maximum voltage drop value of the sampling circuit is obtained, and the corresponding control frequency is obtained according to the maximum voltage drop value, so that the controller can control the switching circuit to be turned on and off according to the control frequency, and the oscillation circuit is locked at the resonance frequency to maintain the resonance state. Therefore, on the one hand, the embodiment saves the manual debugging link, saves the production cost, improves the production efficiency, and on the other hand, enables the spray device with the frequency locking circuit to have a better spray effect and improve the user experience. .

附图说明DRAWINGS

一个或多个实施例通过与之对应的附图中的图片进行示例性说明,这些示例性说明并不构成对实施例的限定,附图中具有相同参考数字标号的元件表示为类似的元件,除非有特别申明,附图中的图不构成比例限制。The one or more embodiments are exemplified by the accompanying drawings in the accompanying drawings, and FIG. The figures in the drawings do not constitute a scale limitation unless otherwise stated.

图1是本申请实施例提供的一种锁频电路的原理框图;1 is a schematic block diagram of a frequency locking circuit provided by an embodiment of the present application;

图2是本申请实施例提供的一种锁频电路的结构示意图;2 is a schematic structural diagram of a frequency locking circuit according to an embodiment of the present application;

图3是本申请另一实施例提供的一种锁频电路的原理框图;3 is a schematic block diagram of a frequency locking circuit according to another embodiment of the present application;

图4是本申请另一实施例提供的一种锁频电路的结构示意图;4 is a schematic structural diagram of a frequency locking circuit according to another embodiment of the present application;

图5是本申请实施例提供的一种锁频电路的控制方法的流程示意图;FIG. 5 is a schematic flowchart of a method for controlling a frequency locking circuit according to an embodiment of the present disclosure;

图6是本申请实施例提供的一种锁频电路的控制方法中一种获取最大压降值对应的预设控制频率的方法的流程示意图;6 is a schematic flowchart of a method for acquiring a preset control frequency corresponding to a maximum voltage drop value in a method for controlling a frequency locking circuit according to an embodiment of the present disclosure;

图7是本申请实施例提供的一种锁频电路的控制方法中另一种获取最大压降值对应的预设控制频率的方法的流程示意图。FIG. 7 is a schematic flow chart of another method for obtaining a preset control frequency corresponding to a maximum voltage drop value in a method for controlling a frequency locking circuit according to an embodiment of the present disclosure.

具体实施方式Detailed ways

为使本申请实施例的目的、技术方案和优点更加清楚,下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,应当理解,此处所描述的具体实施例仅用以解释本申请,并不用于限定本申请。The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. The specific embodiments are only used to explain the present application and are not intended to limit the application.

请参阅图1,图1是本申请实施例提供的一种锁频电路的原理框图。如图1所示,该锁频电路包括:开关电路101、采样电路102、控制器103以及振荡电 路104。Please refer to FIG. 1. FIG. 1 is a schematic block diagram of a frequency locking circuit according to an embodiment of the present application. As shown in FIG. 1, the frequency locking circuit includes: a switch circuit 101, a sampling circuit 102, a controller 103, and an oscillating power Road 104.

其中,开关电路101包括控制端101a、输入端101b和输出端101c,开关电路101的输入端101b连接振荡电路104,开关电路101的输出端101c连接采样电路102的第一端,开关电路101的控制端101a连接控制器103的控制信号输出端,用于输出控制信号,当该控制信号控制开关电路101导通时,电源通过振荡电路104,控制振荡电路104振荡。The switch circuit 101 includes a control terminal 101a, an input terminal 101b, and an output terminal 101c. The input terminal 101b of the switch circuit 101 is connected to the oscillation circuit 104. The output terminal 101c of the switch circuit 101 is connected to the first end of the sampling circuit 102. The control terminal 101a is connected to the control signal output terminal of the controller 103 for outputting a control signal. When the control signal controls the switch circuit 101 to be turned on, the power supply passes through the oscillation circuit 104 to control the oscillation circuit 104 to oscillate.

控制器103的检测信号输入端分别连接开关电路101的输出端101c和采样电路102的第一端。在开关电路101导通时,控制器103检测采样电路102对应的压降值。The detection signal input terminals of the controller 103 are respectively connected to the output terminal 101c of the switch circuit 101 and the first terminal of the sampling circuit 102. When the switch circuit 101 is turned on, the controller 103 detects a voltage drop value corresponding to the sampling circuit 102.

在本实施例中,该振荡电路104可以是LC振荡电路,该控制器103可以是单片机。根据LC串联电路谐振时,阻抗最小、电流最大的特点,因此,当采样电路102的压降越大时,振荡电路越接近谐振状态。In this embodiment, the oscillating circuit 104 can be an LC oscillating circuit, and the controller 103 can be a single chip microcomputer. According to the LC series circuit resonance, the impedance is the smallest and the current is the largest. Therefore, when the voltage drop of the sampling circuit 102 is larger, the oscillation circuit is closer to the resonance state.

因此,该振荡电路104的锁频电路的发明目的在于,检测出采样电路102的最大压降值,根据该最大压降值获取其对应的控制频率,根据该控制频率控制开关电路101的通断,进而控制振荡电路104的工作频率,以使振荡电路104工作在谐振状态。Therefore, the purpose of the frequency-locked circuit of the oscillating circuit 104 is to detect the maximum voltage drop value of the sampling circuit 102, obtain a corresponding control frequency according to the maximum voltage drop value, and control the switching of the switch circuit 101 according to the control frequency. The operating frequency of the oscillating circuit 104 is controlled to operate the oscillating circuit 104 in a resonant state.

该锁频电路的工作原理是:由控制器103输出控制信号控制开关电路101通断,进而控制振荡电路104振荡,与此同时,在该控制信号对应的控制频率下,检测采样电路102的压降值,在这个过程中,更新控制器103输出的控制信号的控制频率的大小,并且在每次更新控制信号的控制频率后,检测采样电路102的压降值。当更新后的控制频率大小超出预设控制频率范围时,从检测到的全部的压降值中获取采样电路102的最大的压降值,由于振荡电路104在谐振状态时,具有阻抗最小、电流最大的特点,因此,当采样电路102的压降越大时,振荡电路104越接近谐振状态。由此,获取采样电路102的最大的压降值,并且获取该最大压降值对应的控制频率,当控制器103以该控制频率经开关电路101来控制振荡电路104振荡时,振荡电路104能够工作在谐振状态。其中,该预设控制频率范围可以是[f0(1-a%),f0(1+a%)],其中,f0指的是所述振荡电路104的谐振频率,a为预设范围内的任意参数,该预设范围可以是a大于0且小于100。在本实施例中,a具体可以取10,即预设控制频率范围是[f0(1-10%),f0(1+10%)],该f0可以根据下述公式计算得到,其中L指的是振荡电路 104中的电感的等效感抗值,C指的是振荡电路104中电容和雾化片的等效容抗值。其中,雾化片可等效为电容。The working principle of the frequency locking circuit is: the controller 103 outputs a control signal to control the switching circuit 101 to be turned on and off, thereby controlling the oscillation of the oscillation circuit 104, and at the same time, detecting the voltage of the sampling circuit 102 at the control frequency corresponding to the control signal. The value is lowered, and in this process, the magnitude of the control frequency of the control signal output from the controller 103 is updated, and the voltage drop value of the sampling circuit 102 is detected each time the control frequency of the control signal is updated. When the updated control frequency exceeds the preset control frequency range, the maximum voltage drop value of the sampling circuit 102 is obtained from all the detected voltage drop values, and the impedance circuit 104 has the minimum impedance and current when the resonant circuit 104 is in the resonant state. The biggest feature, therefore, the greater the voltage drop across the sampling circuit 102, the closer the oscillating circuit 104 is to the resonant state. Thereby, the maximum voltage drop value of the sampling circuit 102 is obtained, and the control frequency corresponding to the maximum voltage drop value is obtained. When the controller 103 controls the oscillation circuit 104 to oscillate via the switching circuit 101 at the control frequency, the oscillation circuit 104 can Working in a resonant state. The preset control frequency range may be [f 0 (1-a%), f 0 (1+a%)], where f 0 refers to the resonant frequency of the oscillating circuit 104, and a is a preset. Any parameter within the range, which may be a greater than 0 and less than 100. In this embodiment, a can be specifically taken as 10, that is, the preset control frequency range is [f 0 (1-10%), f 0 (1+10%)], and the f 0 can be calculated according to the following formula. Wherein L refers to the equivalent inductance value of the inductance in the oscillation circuit 104, and C refers to the equivalent capacitance value of the capacitance and the atomization sheet in the oscillation circuit 104. Among them, the atomizing sheet can be equivalent to a capacitor.

Figure PCTCN2017115712-appb-000001
Figure PCTCN2017115712-appb-000001

请参阅图2,在一些实施例中,开关电路101包括:第一电阻R1、第二电阻R2以及开关管Q1。其中,第一电阻R1的一端连接控制器103的控制信号输出端,第一电阻R1的另一端分别连接第二电阻R2的一端和开关管Q1的控制端;第二电阻R2的另一端接地;开关管Q1的输入端连接振荡电路104;开关管的输出端分别连接采样电路102的第一端和控制器103的检测信号输入端。在本实施例中,该开关管Q1可以是三极管,当其是三极管时,该控制端为三极管的基极,该输入端为三极管的集电极,该输出端为三极管的发射极。该开关管Q1还可以是场效应管,比如MOS场效应管等,当其是场效应管时,该控制端为场效应管的栅极,该输入端为场效应管的漏极,该输出端为场效应管的源极。Referring to FIG. 2, in some embodiments, the switch circuit 101 includes a first resistor R1, a second resistor R2, and a switch transistor Q1. One end of the first resistor R1 is connected to the control signal output end of the controller 103, and the other end of the first resistor R1 is respectively connected to one end of the second resistor R2 and the control end of the switch tube Q1; the other end of the second resistor R2 is grounded; The input end of the switch tube Q1 is connected to the oscillating circuit 104; the output end of the switch tube is respectively connected to the first end of the sampling circuit 102 and the detection signal input end of the controller 103. In this embodiment, the switch tube Q1 may be a triode. When it is a triode, the control end is the base of the triode, the input end is the collector of the triode, and the output end is the emitter of the triode. The switch Q1 can also be a field effect transistor, such as a MOS field effect transistor. When it is a field effect transistor, the control terminal is the gate of the FET, and the input terminal is the drain of the FET, and the output is the output. The end is the source of the FET.

其中,采样电路102为采样电阻R3。检测采样电阻R3的压降值的具体过程包括:在开关管Q1导通后,检测采样电阻R3的电压,该电压发送至控制器103的AD检测信号输入端口WH_AD。需要说明的是,当开关管Q1是三极管时,只有在其基极和发射极之间的电压差值大于预设阈值时,三极管才会导通,当开关管Q1是场效应管时,只有在其栅源电压差值大于预设阈值时,场效应管才会导通。因此,在这里采样电阻R3的阻值不能太大,可以根据电路中各元器件的参数合理的设置采样电阻R3的阻值。The sampling circuit 102 is a sampling resistor R3. The specific process of detecting the voltage drop value of the sampling resistor R3 includes detecting the voltage of the sampling resistor R3 after the switching transistor Q1 is turned on, and the voltage is sent to the AD detection signal input port WH_AD of the controller 103. It should be noted that when the switching transistor Q1 is a triode, the triode will be turned on only when the voltage difference between the base and the emitter is greater than a preset threshold. When the switching transistor Q1 is a field effect transistor, only The FET is turned on when the gate-to-source voltage difference is greater than a predetermined threshold. Therefore, the resistance of the sampling resistor R3 is not too large here, and the resistance of the sampling resistor R3 can be reasonably set according to the parameters of each component in the circuit.

在本实施例中,可以采用平均值算法计算采样电阻R3的压降值,具体地,控制器103向开关电路101输出控制信号,当以该控制信号对应的控制频率控制开关电路101通断时,在该控制频率下,多次检测采样电阻R3的电压,最后将检测到的多个电压求平均,从而得到该控制频率对应的采样电阻R3的压降值。In this embodiment, the average value algorithm may be used to calculate the voltage drop value of the sampling resistor R3. Specifically, the controller 103 outputs a control signal to the switch circuit 101, and when the switch circuit 101 is controlled to be turned on and off by the control frequency corresponding to the control signal. At the control frequency, the voltage of the sampling resistor R3 is detected a plurality of times, and finally, the detected plurality of voltages are averaged to obtain a voltage drop value of the sampling resistor R3 corresponding to the control frequency.

其中,振荡电路104包括:第一电感L1、第二电感L2、第一电容C1、第二电容C2以及雾化片W1。其中,第一电感L1的一端连接电源,第一电感L1的另一端分别连接第一电容C1的一端和开关电路101的输入端101b,第一电容C1的另一端分别连接第二电感L2和第二电容C2,雾化片W1的一端连接第二电感L2,其另一端分别连接第二电容C2和接地。The oscillating circuit 104 includes a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, and an atomizing sheet W1. One end of the first inductor L1 is connected to the power source, and the other end of the first inductor L1 is respectively connected to one end of the first capacitor C1 and the input end 101b of the switch circuit 101, and the other end of the first capacitor C1 is respectively connected to the second inductor L2 and the first The second capacitor C2 has one end connected to the second inductor L2 and the other end connected to the second capacitor C2 and the ground.

在其他一些实施例中,请参阅图3,所述锁频电路还包括滤波电路105,该 滤波电路105的一端连接在开关电路101和采样电路102之间,其另一端连接控制器103,具体地,滤波电路105的一端连接开关电路101的输出端101c和采样电路102的第一端,其另一端连接控制器103的检测信号输入端。在这里,采样电路102所产生的压降信号向控制器103输入时,先经过滤波电路105对其进行过滤,将压降信号中的杂波过滤掉,以使控制器103准确的检测出采样电阻R3的压降值,从而能够获取更加精准的控制频率。In other embodiments, referring to FIG. 3, the frequency locking circuit further includes a filtering circuit 105. One end of the filter circuit 105 is connected between the switch circuit 101 and the sampling circuit 102, and the other end thereof is connected to the controller 103. Specifically, one end of the filter circuit 105 is connected to the output end 101c of the switch circuit 101 and the first end of the sampling circuit 102. The other end thereof is connected to the detection signal input terminal of the controller 103. Here, when the voltage drop signal generated by the sampling circuit 102 is input to the controller 103, it is filtered by the filter circuit 105 to filter out the clutter in the voltage drop signal, so that the controller 103 can accurately detect the sampling. The voltage drop of resistor R3 allows for a more precise control frequency.

请参阅图4,在一些实施例中,该滤波电路105包括第三电阻R4和第三电容C3。其中,第三电阻R4的一端分别连接采样电阻R3的第一端和开关管Q1的输出端,第三电阻R4的另一端连接第三电容C3的一端和控制器103的检测信号输入端;该第三电容C3的另一端接地。在这里,采样电阻R3两端的电压经过第三电阻R4、第三电容C3滤波后,输出至控制器103的检测信号输入端口WH_AD,通过检测获取采样电阻R3的压降值。Referring to FIG. 4, in some embodiments, the filter circuit 105 includes a third resistor R4 and a third capacitor C3. The first end of the third resistor R4 is connected to the first end of the sampling resistor R3 and the output end of the switch tube Q1, and the other end of the third resistor R4 is connected to one end of the third capacitor C3 and the detection signal input end of the controller 103; The other end of the third capacitor C3 is grounded. Here, the voltage across the sampling resistor R3 is filtered by the third resistor R4 and the third capacitor C3, and then output to the detection signal input port WH_AD of the controller 103, and the voltage drop value of the sampling resistor R3 is obtained by detection.

本领域技术人员可以理解的是,根据本申请实施例公开的锁频电路的功能的描述(如滤波等),可以结合实际情况,对其具体的功能电路模块进行调整、更改或者替换。这样的调整、更改或者替换获取的技术方案均属于本申请实施例公开的范围。It can be understood by those skilled in the art that the description of the function of the frequency-locked circuit disclosed in the embodiment of the present application (such as filtering, etc.) can be adjusted, changed or replaced with the specific functional circuit module according to the actual situation. Such technical solutions for adjustment, modification or replacement are all within the scope disclosed in the embodiments of the present application.

需要说明的是,本申请实施例提供的锁频电路可以应用于喷雾装置中,该喷雾装置可以是加湿器、喷雾美容仪等等。It should be noted that the frequency locking circuit provided by the embodiment of the present application can be applied to a spray device, which can be a humidifier, a spray beauty device, or the like.

该喷雾装置的工作原理是:控制器103首先工作在扫频模式,在这个过程中,控制器103输出控制信号控制开关电路101通断,从而控制振荡电路104振荡,与此同时,在该控制信号对应的控制频率下,检测采样电路102的压降值,在这个过程中,更新控制器103输出的控制信号的控制频率的大小,并且在每次更新控制信号的控制频率后,检测采样电路102的压降值。当更新后的控制频率大小超出预设控制频率范围时,从检测到的全部的压降值中获取采样电路102的最大的压降值,并且获取该最大压降值对应的控制频率,由此,退出扫频模式,进入锁频模式,在锁频模式下,控制器103输出控制信号经开关电路101控制振荡电路104振荡,其中,该控制信号的频率为最大压降值对应的控制频率。此时,振荡电路104能够工作在谐振状态,从而使雾化片尽可能的工作在谐振状态,该喷雾装置具备较好的喷雾效果。The working principle of the spraying device is that the controller 103 first operates in a frequency sweeping mode, in which the controller 103 outputs a control signal to control the switching circuit 101 to be turned on and off, thereby controlling the oscillation circuit 104 to oscillate, and at the same time, in the control At the control frequency corresponding to the signal, the voltage drop value of the sampling circuit 102 is detected. In this process, the magnitude of the control frequency of the control signal output by the controller 103 is updated, and the sampling circuit is detected after each control frequency of the control signal is updated. The pressure drop value of 102. When the updated control frequency exceeds the preset control frequency range, the maximum voltage drop value of the sampling circuit 102 is obtained from all the detected voltage drop values, and the control frequency corresponding to the maximum voltage drop value is obtained, thereby The frequency sweep mode is entered and the frequency lock mode is entered. In the frequency lock mode, the output signal of the controller 103 is controlled by the switch circuit 101 to control the oscillation circuit 104 to oscillate. The frequency of the control signal is the control frequency corresponding to the maximum voltage drop value. At this time, the oscillating circuit 104 can operate in a resonant state, so that the atomizing sheet works as much as possible in a resonant state, and the spraying device has a good spraying effect.

本申请实施例提供了一种锁频电路,该锁频电路通过输出预设控制频段内 的控制频率控制开关电路的通断,并且在开关电路按每一控制频率通断时,检测每一控制频率对应的采样电路的压降值,最后获取采样电路的最大压降值,根据该最大压降值获取对应的控制频率,从而能够使控制器根据该控制频率控制开关电路通断,使振荡电路锁定在谐振频率,维持谐振状态,由此,一方面,该实施方式节省了人工调试环节,节约了生产成本,提高了生产效率,另一方面,能够使具备该锁频电路的喷雾装置具备较好的喷雾效果,提升了用户体验。The embodiment of the present application provides a frequency locking circuit, and the frequency locking circuit outputs a preset control frequency band. The control frequency controls the switching of the switching circuit, and when the switching circuit is turned on and off for each control frequency, detects the voltage drop value of the sampling circuit corresponding to each control frequency, and finally obtains the maximum voltage drop value of the sampling circuit, according to the maximum The voltage drop value acquires a corresponding control frequency, so that the controller can control the switching circuit to be turned on and off according to the control frequency, and the oscillation circuit is locked at the resonance frequency to maintain the resonance state. Thus, on the one hand, the embodiment saves the manual debugging link. The production cost is saved and the production efficiency is improved. On the other hand, the spray device with the frequency-locked circuit can have a better spray effect and improve the user experience.

请参阅图5,本申请实施例还提供了一种锁频电路的控制方法。该方法可以应用在上述实施例中的锁频电路中,该方法包括:Referring to FIG. 5, an embodiment of the present application further provides a method for controlling a frequency locking circuit. The method can be applied to the frequency locking circuit in the above embodiment, and the method includes:

步骤11、按预设控制频段控制所述开关电路的通断,并检测所述采样电路对应的压降值,获取最大压降值所对应的控制频率;Step 11. Control the on/off of the switch circuit according to a preset control frequency band, and detect a voltage drop value corresponding to the sampling circuit, and obtain a control frequency corresponding to the maximum voltage drop value;

步骤12、锁定按获取到的所述控制频率控制所述开关电路的通断。Step 12: Locking controls the on/off of the switch circuit according to the obtained control frequency.

在本申请实施例中,该振荡电路、开关电路以及采样电路可以分别是上述实施例中的振荡电路104、开关电路101、采样电路102。由上述实施例中的控制器103执行本申请实施例提供的方法。In the embodiment of the present application, the oscillating circuit, the switching circuit, and the sampling circuit may be the oscillating circuit 104, the switching circuit 101, and the sampling circuit 102 in the above embodiments, respectively. The method provided by the embodiment of the present application is executed by the controller 103 in the above embodiment.

在执行本方法之前,可以预先设置预设控制频率的范围,在该预设控制频率的范围内,选择若干个控制频率,该预设控制频段为[f0(1-a%),f0(1+a%)],其中,f0指的是所述锁频电路中所述振荡电路的谐振频率,a为预设范围内的任意参数。例如,设置该预设控制频率的范围是[f0(1-10%),f0(1+10%)],那么可以基于该范围确定若干个控制频率分别是f0(1-10%),f0(1-10%)+a,f0(1-10%)+2a,...,f0(1+10%),其中a的大小根据f0(1-10%)与f0(1+10%)的差值大小,以及控制频率的个数来确定;f0的大小可以根据上述锁频电路实施例中的计算公式获取。Before performing the method, the range of the preset control frequency may be preset, and within the range of the preset control frequency, a plurality of control frequencies are selected, the preset control frequency band is [f 0 (1-a%), f 0 (1+a%)], where f 0 refers to the resonant frequency of the oscillating circuit in the frequency-locked circuit, and a is an arbitrary parameter within a preset range. For example, if the range of the preset control frequency is set to [f 0 (1-10%), f 0 (1+10%)], then it can be determined based on the range that several control frequencies are respectively f 0 (1-10%) ), f 0 (1-10%)+a, f 0 (1-10%)+2a,...,f 0 (1+10%), where the size of a is based on f 0 (1-10%) The magnitude of the difference from f 0 (1+10%) and the number of control frequencies are determined; the size of f 0 can be obtained according to the calculation formula in the above embodiment of the frequency-locked circuit.

需要说明的是,虽然上述预设控制频率的范围控制在f0的上下10%范围内,本领域技术人员可以理解的是,还可以将该预设控制频率的范围控制在f0的其他数值范围内。It should be noted that although the range of the preset control frequency is controlled within the upper 10% range of f 0 , those skilled in the art can understand that the range of the preset control frequency can also be controlled to other values of f 0 . Within the scope.

在确定所述预设控制频段后,基于预设控制频段中的每个控制频率,检测采样电路102的压降值,最后获取最大压降值,以及该最大压降值对应的控制频率。具体地,如图6所示,该过程包括:After determining the preset control frequency band, detecting a voltage drop value of the sampling circuit 102 based on each control frequency in the preset control frequency band, and finally obtaining a maximum voltage drop value and a control frequency corresponding to the maximum voltage drop value. Specifically, as shown in FIG. 6, the process includes:

步骤a、在预设控制频段内向所述开关电路输出第一振荡频率,并根据所述第一振荡频率获取所述采样电路的第一压降值,并保存所述第一振荡频率和所述第一压降值; Step a, outputting a first oscillation frequency to the switch circuit in a preset control frequency band, and acquiring a first voltage drop value of the sampling circuit according to the first oscillation frequency, and saving the first oscillation frequency and the First pressure drop value;

步骤b、按照预设频率差减小或增大所述第一振荡频率,得到第二振荡频率,并根据所述第二振荡频率获取所述采样电路的第二压降值;该预设频率差可以认为设置,也可以系统设置;Step b: decreasing or increasing the first oscillation frequency according to a preset frequency difference to obtain a second oscillation frequency, and acquiring a second voltage drop value of the sampling circuit according to the second oscillation frequency; the preset frequency The difference can be considered as a setting, or it can be set by the system;

步骤c、判断所述第二压降值是否大于所述第一压降值,如果是,将所述第二振荡频率和第二压降值替换已保存的所述第一振荡频率和第一压降值,直至得到预设控制频段内使得所述采样电路产生最大压降值所对应的控制频率。Step c, determining whether the second voltage drop value is greater than the first voltage drop value, and if so, replacing the second oscillation frequency and the second voltage drop value with the saved first oscillation frequency and the first The voltage drop value is obtained until the preset control frequency band is obtained such that the sampling circuit generates a control frequency corresponding to the maximum voltage drop value.

在一些实施例中,如图7所示,获取采样电路102的最大压降值所对应的控制频率的过程还可以包括:In some embodiments, as shown in FIG. 7, the process of acquiring the control frequency corresponding to the maximum voltage drop value of the sampling circuit 102 may further include:

步骤111、根据频率大小将所述若干个预设控制频率进行排序;Step 111: Sort the plurality of preset control frequencies according to a frequency size;

步骤112、根据所述排序,从所述若干个预设控制频率中根据从小到大的顺序依次选择一控制频率控制所述开关电路的通断,并且根据每次所选择的控制频率获取所述采样电路的压降值;Step 112: According to the sorting, sequentially select a control frequency to control on/off of the switch circuit according to a sequence from small to large, and acquire the switch according to each selected control frequency. The voltage drop value of the sampling circuit;

步骤113、在根据所述若干个预设控制频率,获取到全部的所述采样电路的压降值后,获取最大压降值;Step 113: After obtaining the voltage drop values of all the sampling circuits according to the plurality of preset control frequencies, obtaining a maximum voltage drop value;

步骤114、根据所述最大压降值,获取预设控制频率。Step 114: Acquire a preset control frequency according to the maximum voltage drop value.

下面通过举例来说明上述步骤111-步骤114。例如,预先设置该预设控制频率的范围是[90%f0,110%f0],那么可以基于该范围确定若干个控制频率分别是90%f0、f0、110%f0。首先输出控制频率为90%f0的控制信号,控制开关电路通断,同时根据该控制频率90%f0检测出采样电路的压降值为V1,接着输出控制频率为f0的控制信号,控制开关电路通断,同时根据该控制频率f0检测出采样电路的压降值为V2,最后输出控制频率为110%f0的控制信号,控制开关电路通断,同时根据该控制频率110%f0检测出采样电路的压降值为V3。通过比较V1、V2以及V3的大小,获取最大压降值,比如最大压降值为V2,此时V2对应的控制频率f0即所述预设控制频率,可以根据该控制频率f0控制开关电路的通断,并驱动LC振荡电路振荡,此时,LC振荡电路接近谐振状态。The above steps 111-114 are explained by way of example below. For example, if the range of the preset control frequency is preset to be [90%f 0 , 110%f 0 ], then several control frequencies can be determined based on the range to be 90% f 0 , f 0 , 110% f 0 , respectively . First, the control signal with the control frequency of 90%f 0 is output, the switch circuit is controlled to be turned on and off, and the voltage drop value of the sampling circuit is detected as V1 according to the control frequency 90%f 0 , and then the control signal with the control frequency f 0 is output. The control switch circuit is turned on and off, and the voltage drop value of the sampling circuit is detected as V2 according to the control frequency f 0 , and finally the control signal with the control frequency of 110% f 0 is output, and the control switch circuit is turned on and off, and 110% according to the control frequency. f 0 detects that the voltage drop of the sampling circuit is V3. By comparing the sizes of V1, V2, and V3, the maximum voltage drop value is obtained, for example, the maximum voltage drop value is V2. At this time, the control frequency f 0 corresponding to V2 is the preset control frequency, and the switch can be controlled according to the control frequency f 0 . The circuit is turned on and off, and drives the LC oscillation circuit to oscillate. At this time, the LC oscillation circuit approaches the resonance state.

在一些实施例中,还可以基于每一控制频率多次检测采样电路的压降值,比如,连续5次输出控制频率为50%f0的控制信号,每次均检测采样电路的压降值,最后求取5次的平均值,该平均值即该采样电路在控制频率为50%f0时的压降值。In some embodiments, the voltage drop value of the sampling circuit may also be detected multiple times based on each control frequency. For example, the control signal with the control frequency of 50% f 0 is outputted five times in succession, and the voltage drop value of the sampling circuit is detected each time. Finally, the average value of 5 times is obtained, which is the voltage drop value of the sampling circuit when the control frequency is 50%f 0 .

本申请实施例提供了一种锁频电路的控制方法,该方法通过检测采样电路 的压降值获取其对应控制频率,根据该获取的控制频率能够自动锁定振荡电路的谐振频率,从而使振荡电路工作在谐振状态。该方法在生产上节省了人工调试环节,节约了生成成本,提高了生产效率。The embodiment of the present application provides a method for controlling a frequency locking circuit, which detects a sampling circuit The voltage drop value obtains its corresponding control frequency, and the resonant frequency of the oscillating circuit can be automatically locked according to the acquired control frequency, thereby causing the oscillating circuit to operate in a resonant state. The method saves the manual debugging link in production, saves the generation cost and improves the production efficiency.

以上所述仅为本申请的实施方式,并非因此限制本申请的专利范围,凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本申请的专利保护范围内。 The above description is only the embodiment of the present application, and thus does not limit the scope of the patent application, and the equivalent structure or equivalent process transformation of the specification and the drawings of the present application, or directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of this application.

Claims (8)

  1. 一种锁频电路,其特征在于,所述锁频电路包括:开关电路、采样电路、控制器以及振荡电路,A frequency locking circuit, characterized in that: the frequency locking circuit comprises: a switching circuit, a sampling circuit, a controller and an oscillating circuit,
    所述开关电路的输入端连接所述振荡电路,所述开关电路的输出端连接所述采样电路的第一端,所述控制器的控制信号输出端连接所述开关电路的控制端,所述控制器的检测信号输入端分别连接所述开关电路的输出端和所述采样电路的第一端,所述采样电路的第二端接地;An input end of the switch circuit is connected to the oscillating circuit, an output end of the switch circuit is connected to a first end of the sampling circuit, and a control signal output end of the controller is connected to a control end of the switch circuit, The detection signal input end of the controller is respectively connected to the output end of the switch circuit and the first end of the sampling circuit, and the second end of the sampling circuit is grounded;
    其中,所述控制器用于:按预设控制频段控制所述开关电路的通断,并检测所述采样电路对应的压降值,获取最大压降值所对应的控制频率,锁定按获取到的所述控制频率控制所述开关电路的通断。The controller is configured to: control the on/off of the switch circuit according to a preset control frequency band, and detect a voltage drop value corresponding to the sampling circuit, obtain a control frequency corresponding to the maximum voltage drop value, and lock the acquired The control frequency controls on and off of the switching circuit.
  2. 根据权利要求1所述的锁频电路,其特征在于,所述采样电路为采样电阻。The frequency locking circuit of claim 1 wherein said sampling circuit is a sampling resistor.
  3. 根据权利要求1所述的锁频电路,其特征在于,所述开关电路包括:第一电阻、第二电阻以及开关管;The frequency locking circuit according to claim 1, wherein the switching circuit comprises: a first resistor, a second resistor, and a switch tube;
    所述第一电阻的一端连接所述控制器的控制信号输出端,所述第一电阻的另一端分别连接所述第二电阻的一端和所述开关管的控制端;所述开关管的输入端连接所述振荡电路,所述开关管的输出端分别连接所述采样电路的第一端和所述控制器的检测信号输入端;所述第二电阻的另一端接地。One end of the first resistor is connected to a control signal output end of the controller, and the other end of the first resistor is respectively connected to one end of the second resistor and a control end of the switch tube; the input of the switch tube The end is connected to the oscillating circuit, and the output end of the switch tube is respectively connected to the first end of the sampling circuit and the detection signal input end of the controller; the other end of the second resistor is grounded.
  4. 根据权利要求1所述的锁频电路,其特征在于,所述振荡电路包括:第一电感、第二电感、第一电容、第二电容以及雾化片;The frequency-locking circuit according to claim 1, wherein the oscillating circuit comprises: a first inductor, a second inductor, a first capacitor, a second capacitor, and an atomizing sheet;
    所述第一电感的一端连接电源,所述第一电感的另一端分别连接所述第一电容一端和所述开关电路的输入端;所述第一电容的另一端分别连接所述第二电感和第二电容;One end of the first inductor is connected to the power source, and the other end of the first inductor is respectively connected to one end of the first capacitor and an input end of the switch circuit; the other end of the first capacitor is respectively connected to the second inductor And a second capacitor;
    所述雾化片的一端连接所述第二电感,其另一端连接所述第二电容,并接地。One end of the atomization piece is connected to the second inductor, and the other end is connected to the second capacitor and grounded.
  5. 根据权利要求3所述的锁频电路,其特征在于,还包括滤波电路,所述滤波电路包括:第三电阻和第三电容;The frequency locking circuit according to claim 3, further comprising a filter circuit, the filter circuit comprising: a third resistor and a third capacitor;
    所述第三电阻的一端分别连接所述采样电路的第一端和所述开关管的输出端,所述第三电阻的另一端连接所述第三电容的一端和所述控制器的检测信号 输入端;所述第三电容的另一端接地。One end of the third resistor is respectively connected to the first end of the sampling circuit and the output end of the switch tube, and the other end of the third resistor is connected to one end of the third capacitor and a detection signal of the controller An input end; the other end of the third capacitor is grounded.
  6. 一种锁频电路的控制方法,其特征在于,所述锁频电路为权利要求1至5任一项所述的锁频电路,所述方法包括:A method for controlling a frequency-locked circuit, wherein the frequency-locking circuit is the frequency-locking circuit according to any one of claims 1 to 5, the method comprising:
    按预设控制频段控制所述开关电路的通断,并检测所述采样电路对应的压降值,获取最大压降值所对应的控制频率;Controlling the on/off of the switch circuit according to a preset control frequency band, and detecting a voltage drop value corresponding to the sampling circuit, and obtaining a control frequency corresponding to the maximum voltage drop value;
    锁定按获取到的所述控制频率控制所述开关电路的通断。The lock controls the on and off of the switch circuit according to the acquired control frequency.
  7. 根据权利要求6所述的方法,其特征在于,所述按预设控制频段控制所述开关电路的通断,并检测所述采样电路对应的压降值,获取最大压降值所对应的控制频率,具体包括:The method according to claim 6, wherein the controlling the on/off of the switch circuit according to a preset control frequency band, and detecting the voltage drop value corresponding to the sampling circuit, and obtaining the control corresponding to the maximum voltage drop value Frequency, including:
    步骤a、在预设控制频段内向所述开关电路输出第一振荡频率,并根据所述第一振荡频率获取所述采样电路的第一压降值,并保存所述第一振荡频率和所述第一压降值;Step a, outputting a first oscillation frequency to the switch circuit in a preset control frequency band, and acquiring a first voltage drop value of the sampling circuit according to the first oscillation frequency, and saving the first oscillation frequency and the First pressure drop value;
    步骤b、按照预设频率差减小或增大所述第一振荡频率,得到第二振荡频率,并根据所述第二振荡频率获取所述采样电路的第二压降值;Step b: decreasing or increasing the first oscillation frequency according to a preset frequency difference to obtain a second oscillation frequency, and acquiring a second voltage drop value of the sampling circuit according to the second oscillation frequency;
    步骤c、判断所述第二压降值是否大于所述第一压降值,如果是,将所述第二振荡频率和第二压降值替换已保存的所述第一振荡频率和第一压降值,直至得到预设控制频段内使得所述采样电路产生最大压降值所对应的控制频率。Step c, determining whether the second voltage drop value is greater than the first voltage drop value, and if so, replacing the second oscillation frequency and the second voltage drop value with the saved first oscillation frequency and the first The voltage drop value is obtained until the preset control frequency band is obtained such that the sampling circuit generates a control frequency corresponding to the maximum voltage drop value.
  8. 根据权利要求6或7所述的方法,其特征在于,所述预设控制频段为[f0(1-a%),f0(1+a%)],其中,f0指的是所述锁频电路中所述振荡电路的谐振频率,a为预设范围内的任意参数。 The method according to claim 6 or 7, wherein the preset control frequency band is [f 0 (1-a%), f 0 (1+a%)], wherein f 0 refers to The resonant frequency of the oscillating circuit in the frequency locking circuit, a is an arbitrary parameter within a preset range.
PCT/CN2017/115712 2017-12-12 2017-12-12 Frequency locking circuit and control method therefor WO2019113789A1 (en)

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