CN212657828U - Ultrasonic frequency-following circuit of humidifier and corresponding atomization sheet driving device - Google Patents
Ultrasonic frequency-following circuit of humidifier and corresponding atomization sheet driving device Download PDFInfo
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- CN212657828U CN212657828U CN202021253847.8U CN202021253847U CN212657828U CN 212657828 U CN212657828 U CN 212657828U CN 202021253847 U CN202021253847 U CN 202021253847U CN 212657828 U CN212657828 U CN 212657828U
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Abstract
The utility model relates to an ultrasonic wave of humidifier chases after circuit and corresponding atomizing piece drive arrangement frequently, wherein, the circuit include frequency adjustable oscillation module, frequency divider, voltage comparison module and trimming module Trimmer, realize the adjustment to output resonant frequency through hardware structure, the process of chasing after frequently is accomplished by hardware, after disposing relevant parameter, only need to make and to pursue the function frequently and just can accomplish and pursue frequently, do not occupy the CPU resource, CPU can carry out other operations at this section time, effective frequency modulation's flexibility and rapidity are taken into account, a large amount of calculations of CPU have been avoided. The ultrasonic frequency tracking circuit and the corresponding atomization plate driving device adopting the humidifier have the characteristics of good performance, simple structure, easiness in operation, flexibility, good performance and low cost.
Description
Technical Field
The utility model relates to a humidifier technical field especially relates to an ultrasonic wave of humidifier chases after circuit and corresponding atomizing piece drive arrangement frequently.
Background
Ultrasonic technology is a relatively mature technology in the world and has been widely used in various fields. The ultrasonic humidifier adopts ultrasonic high-frequency oscillation to atomize water into 1-5 mu m ultrafine particles, and the water mist is diffused into the air through a pneumatic device, so that the air is humidified and is accompanied by rich negative oxygen ions, the air can be refreshed, the health is improved, the dryness heat of the central heating in winter is changed, and a comfortable living environment is created.
The atomization plate is one of the main components of the ultrasonic humidifier. The atomizing sheets are divided into two different categories, namely a solid atomizing sheet and a micropore atomizing sheet, and the atomizing methods and the working principles of the two atomizing sheets are different. The frequency of the solid hole atomization plate is higher, and conventionally, three frequencies are 1.7MHz, 2.4MHz and 3.0 MHz; the conventional frequency of the micropore atomization sheet is 100 KHz-180 KHz.
Each atomization sheet has a fixed resonance point, and the resonance frequency points of different atomization sheets of the same specification have individual differences. Therefore, in practical application, in order to maximize the atomization efficiency of the atomization plate, the method is required to make the frequency of driving the atomization plate be the resonance frequency point of the corresponding atomization plate, and the transduction efficiency of the atomization plate is highest at this time.
There are two methods currently in use, the first is to set the resonant point frequency at the time of shipment, for example, for a 2.4M atomizing plate, the drive frequency is set to 2.4M at the time of shipment, and no frequency tracking is performed during use. The disadvantage of using this method is that the frequencies are consistent, and the resonance points of the atomization plates of the same specification are different individually, so that it cannot be guaranteed that each atomization plate works at the resonance point. The second method is to use a control chip to collect, calculate and adjust the frequency in real time to realize dynamic tracking. The method has the disadvantages that complex software calculation is needed in the process of searching the resonance point, and CPU resources are occupied.
For the driving of the atomizing plate, a common method at present is to use a control circuit to output a square wave drive with a certain frequency, and the working principle of the method is shown in fig. 1. The specific control flow is as follows:
firstly, an enabling MCU outputs a group of square waves with certain frequency, then the frequency is adjusted from low to high, and in the frequency sweep module, the voltage of a feedback voltage detection point is fed back to the MCU for measurement. The relationship between the feedback voltage and the driving frequency is shown in fig. 2. Since the voltage at the point where the driving frequency reaches the resonance point is the maximum, it can be judged whether the driving frequency reaches the resonance point of the atomizing plate by measuring the voltage at the point.
The prior art frequency sweep process is typically implemented in software. As shown in fig. 3, the microcontroller output fm～fnOf (c) is detected. First of all the frequency f is outputmMeasuring the corresponding feedback voltage as ADC with ADCm(ii) a Then the driving frequency is increased to fm+1Measuring the corresponding feedback voltage as ADC with ADCm+1. Comparison ADCmAnd ADCm+1If ADC is large or smallm>ADCm+1Then f ismIs a frequency resonance point; if the ADC ism<ADCm+1Then continue to increase the output frequency to fm+2Measuring the corresponding feedback voltage value as ADCm+2ADC value to be obtainedm+1And ADCm+2Make a comparison if the ADC ism+1>ADCm+2Then ADCm+1Corresponding frequency fm+1Is a resonance point; if the ADC ism+1<ADCm+2Then continue to increase the driving frequency to fm+3… …, and so on until the resonant frequency point is found, at which time the atomization efficiency is highest.
Using this method requires extensive software calculations because the operations described above to compare the ADC results are performed by software calculations. This process takes up a large amount of CPU computation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome the shortcoming of at least one above-mentioned prior art, provide an ultrasonic wave of humidifier that precision is high, the CPU occupancy is low and chases after circuit and corresponding atomizing piece drive arrangement frequently.
In order to achieve the above object, the ultrasonic frequency tracking circuit and the corresponding atomizing sheet driving device of the humidifier of the present invention have the following configurations:
this ultrasonic wave of humidifier circuit of frequency tracking, its key feature is, the circuit include:
an oscillation module with adjustable frequency, which is used for outputting a first clock signal,
the frequency divider generates a corresponding resonant frequency according to the received first clock signal, and the output end of the frequency divider transmits the resonant frequency to an external load;
a voltage comparison module, a first input end of which is configured to receive a current feedback voltage obtained from the external load, the voltage comparison module being configured to compare the current feedback voltage with a threshold voltage, and an output end of the voltage comparison module being configured to output a larger voltage of the current feedback voltage and the threshold voltage as a comparison result, wherein a magnitude of the current feedback voltage is determined by a magnitude of a resonant frequency currently transmitted to the external load by the frequency divider, the threshold voltage is the feedback voltage detected from the external load at a previous time, and an initial value of the threshold voltage is a system preset voltage;
and a first input end of the trimming module is connected with the output end of the voltage comparison module and is used for generating a trimming signal according to the comparison result output by the voltage comparison module, so that the frequency-adjustable oscillation module can adjust the first clock signal according to the trimming signal.
Preferably, the frequency-adjustable oscillation module includes a decoding unit, N switches, a resistor string, a capacitor, a charging/discharging unit, and a shaping unit, wherein the resistor string is grounded after being connected in series with the capacitor;
the resistor string comprises N +1 resistors connected in series, wherein a node between every two adjacent resistors in the resistor string is connected with a first end of a first resistor in the resistor string through a corresponding switch, the first end of the first resistor is connected with a power supply end of the frequency-adjustable oscillation module, and the first end of the first resistor is one end of one resistor in the resistor string which is farthest away from the ground and is not connected with other resistors;
the input end of the decoding unit receives the trimming signal, and N output ends of the decoding unit are respectively connected with the control ends of N switches;
one end of the resistor string adjacent to the capacitor, which is not connected with the capacitor, is connected with the input end of the shaping unit through the charging and discharging unit, and the output end of the shaping unit is used for outputting the first clock signal.
Preferably, the circuit further comprises:
the first input end of the analog-to-digital converter is used for converting the analog signal of the current feedback voltage acquired from the external load into a digital signal, the first output end of the analog-to-digital converter is used for transmitting the digital signal of the current feedback voltage to the first input end of the voltage comparison module, the analog-to-digital converter generates a conversion end signal after converting the analog signal of the current feedback voltage into the digital signal, and the second output end of the analog-to-digital converter sends the conversion end signal to the second input end of the trimming module.
More preferably, the circuit further comprises:
and the output end of the timing module is connected with the second input end of the analog-to-digital converter and used for triggering the analog-to-digital converter to acquire the current feedback voltage from the external load at preset system interval time.
Furthermore, the circuit also comprises a control module;
the first output end of the control module is connected with the second input end of the voltage comparison module and is used for providing the threshold voltage for the voltage comparison module;
the second output end of the control module is connected with the third input end of the trimming module and used for providing an initial value of the trimming signal for the trimming module;
the third output end of the control module is connected with the fourth input end of the trimming module and used for providing the end value of the trimming signal for the trimming module;
the fourth output end of the control module is connected with the input end of the timing module and is used for setting the interval time preset by the system of the timing module;
the input end of the control module is connected with the output end of the voltage comparison module.
Furthermore, the voltage comparison module comprises a first selector, a comparator, a first register and a second register;
the first input end of the comparator forms the first input end of the voltage comparison module;
a first input terminal of the first selector is connected to the feedback voltage detected from the external load at the previous time, an input terminal of the first register is connected to the system preset voltage, an output terminal of the first register is connected to a second input terminal of the first selector, an output terminal of the first selector is connected to a second input terminal of the comparator through a second register, and an output terminal of the comparator is connected to a third input terminal of the first selector;
and the output end of the comparator forms the output end of the voltage comparison module.
Furthermore, the trimming module comprises a third register, a fourth register, a fifth register, a second selector, a trigger, an exclusive-or gate and an adder;
the first input end of the second selector forms the first input end of the trimming module, the input end of the third register forms the third input end of the trimming module, and the input end of the fourth register forms the fourth input end of the trimming module;
the output end of the third register is connected with the first input end of the trigger;
the output end of the fourth register is connected with the first end of the exclusive-or gate;
the output end of the flip-flop is respectively connected with the second end of the exclusive-or gate, the first input end of the fifth register, the second input end of the second selector and the first input end of the adder; the output end of the exclusive-or gate is connected with the second input end of the adder, and the output end of the adder is connected with the second input end of the flip-flop;
the third input end of the trigger and the second input end of the fifth register jointly form a second input end of the trimming module;
the output end of the fifth register is connected with the third input end of the second selector;
and the output end of the second selector outputs the trimming signal.
Furthermore, the timing module comprises a sixth register and a timer, wherein an input end of the sixth register forms an input end of the timing module, an output end of the sixth register is connected with a first input end of the timer, a second input end of the timer is connected with a second clock signal, and an output end of the timer forms an output end of the timing module.
Furthermore, the frequency-adjustable oscillation module, the frequency divider, the voltage comparison module, the trimming module, the analog-to-digital converter, the timing module and the control module are integrated in a chip.
The driving device of the atomization plate is mainly characterized by comprising an ultrasonic frequency tracking circuit of the humidifier, and an atomization module forms the external load.
The utility model discloses an among ultrasonic wave chasing after circuit and corresponding atomizing piece drive arrangement of humidifier, because the circuit include frequency adjustable oscillation module, frequency divider, voltage comparison module and repair and transfer the module, realize the adjustment to output resonant frequency through hardware structure, the process of chasing after frequently is accomplished by hardware, after the relevant parameter has been disposed, only need to enable to chase after frequently the function just can accomplish and chase after frequently, do not occupy the CPU resource, CPU can carry out other operations at this section of time, effectively compromise the flexibility and the rapidity of frequency modulation, a large amount of calculations of CPU have been avoided. The ultrasonic frequency tracking circuit of the humidifier and the corresponding atomization plate driving device have the characteristics of good performance, simple structure, easiness in operation, flexibility, good performance and low cost.
Drawings
Fig. 1 is a schematic diagram of a prior art driving circuit for an atomizing plate.
Fig. 2 is a graph of feedback voltage versus driving frequency.
Fig. 3 is a diagram illustrating a relationship between a feedback voltage and a driving frequency when a driving circuit of a conventional atomizer plate adjusts.
Fig. 4 is a schematic structural diagram of an atomizing sheet driving device according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an oscillation module with adjustable frequency in an embodiment.
Fig. 6 is a schematic structural diagram of a voltage comparison module in an embodiment.
Fig. 7 is a schematic structural diagram of a trimming module in an embodiment.
Fig. 8 is a schematic structural diagram of a timing module in an embodiment.
Detailed Description
In order to more clearly describe the technical content of the present invention, the following further description is given with reference to specific embodiments.
As shown in fig. 4 to 8, in this embodiment, the ultrasonic frequency-chasing circuit of the humidifier includes:
an oscillator module OSC with adjustable frequency, for outputting a first clock signal CLK,
the frequency divider DIV generates a corresponding resonant frequency according to the received first clock signal CLK, and the output end of the frequency divider DIV transmits the resonant frequency to an external load;
a voltage comparison module CMP, a first input end of which is configured to receive a current feedback voltage obtained from the external load, the voltage comparison module being configured to compare the current feedback voltage with a threshold voltage, and output a larger voltage of the current feedback voltage and the threshold voltage as a comparison result by an output end of the voltage comparison module, where a magnitude of the current feedback voltage is determined by a magnitude of a resonant frequency currently supplied to the external load by the frequency divider DIV, the threshold voltage is the feedback voltage detected from the external load at a previous time, and an initial value of the threshold voltage is a system preset voltage;
and a trimming module Trimmer, a first input end of which is connected with an output end of the voltage comparison module and is used for generating a trimming signal according to the comparison result output by the voltage comparison module, so that the oscillator module OSC with adjustable frequency can adjust the first clock signal CLK according to the trimming signal.
The oscillator module OSC with adjustable frequency is used for outputting a first clock signal CLK with adjustable frequency, as shown in fig. 5, an RC oscillator structure may be adopted to form the oscillator module OSC with adjustable frequency, and the adjustment of frequency may be realized by adjusting a resistance value, which is specifically as follows:
in this embodiment, the oscillator module OSC having an adjustable frequency includes a decoding unit, N switches, a resistor string, a capacitor, a charging/discharging unit, and a shaping unit, wherein the resistor string is connected in series with the capacitor and then grounded;
the resistor string comprises N +1 resistors connected in series, wherein a node between every two adjacent resistors in the resistor string is connected with a first end of a first resistor in the resistor string through a corresponding switch, the first end of the first resistor is connected with a power supply end of the oscillator module OSC, and the first end of the first resistor is one end of the resistor string which is farthest away from the ground and is not connected with other resistors;
the input end of the decoding unit receives the trimming signal, and N output ends of the decoding unit are respectively connected with the control ends of N switches;
one end of the resistor string adjacent to the capacitor, which is not connected with the capacitor, is connected with the input end of the shaping unit through the charging and discharging unit, and the output end of the shaping unit is used for outputting the first clock signal CLK;
in the embodiment shown in FIG. 5, N is equal to N +1, i.e. the oscillator module OSC comprises a resistor R0Resistance R1To resistor Rn and resistor R, switch K0、K1And the decoding unit is provided with n +1 ports corresponding to the switching value from Kn to Kn.
The structure can be seen from fig. 5, in which the decoding unit decodes the written trimming signal, the trimming signal is decoded by the decoding unit, the resistance of the access circuit is adjusted according to the decoded value, the magnitude of the bias current can be changed by adjusting the resistance value in the circuit, the current generates a waveform after passing through the charging and discharging unit, and the output of the waveform after passing through the shaping unit is the first clock signal CLK. That is, the frequency of the first clock signal CLK is determined by the trimming signal.
In this embodiment, the circuit further comprises:
the first input end of the analog-to-digital converter ADC is configured to convert the analog signal of the current feedback voltage obtained from the external load into a digital signal, the first output end of the analog-to-digital converter ADC transmits the digital signal of the current feedback voltage to the first input end of the voltage comparison module, and the analog-to-digital converter ADC generates a conversion end signal after converting the analog signal of the current feedback voltage into the digital signal, and the second output end of the analog-to-digital converter ADC transmits the conversion end signal to the second input end of the trimming module Trimmer.
In this embodiment, the circuit further comprises:
and the output end of the timing module Timer is connected with the second input end of the analog-to-digital converter ADC and is used for triggering the analog-to-digital converter ADC to acquire the current feedback voltage from the external load at the preset interval time of the system.
In this embodiment, the circuit further comprises a control module CPU;
the first output end of the control module CPU is connected with the second input end of the voltage comparison module and is used for providing the threshold voltage for the voltage comparison module;
the second output end of the control module CPU is connected to the third input end of the trimming module Trimmer, and is configured to provide the initial value of the trimming signal to the trimming module Trimmer;
the third output end of the control module CPU is connected to the fourth input end of the trimming module Trimmer, and is configured to provide the trimming module Trimmer with an end value of the trimming signal;
wherein the initial value and the end value are a maximum value and a minimum value defining the trimming signal. For example, if the initial value is 3, the end value is 10, and the trimming step is 1, the values of the trimming signals are changed from 2, 3 and 4 …, and when the value of the trimming signal reaches 10, the trimming is not performed, and the frequency tracking process is ended. A fourth output end of the control module CPU is connected to an input end of the timing module Timer, and is configured to set the system preset interval time of the timing module Timer;
the input end of the control module CPU is connected with the output end of the voltage comparison module.
As shown in fig. 6, in this embodiment, the voltage comparison module includes a first selector, a comparator, a first register and a second register;
the first input end of the comparator forms the first input end of the voltage comparison module;
a first input terminal of the first selector is connected to the feedback voltage detected from the external load at the previous time, an input terminal of the first register is connected to the system preset voltage, an output terminal of the first register is connected to a second input terminal of the first selector, an output terminal of the first selector is connected to a second input terminal of the comparator through a second register, and an output terminal of the comparator is connected to a third input terminal of the first selector;
and the output end of the comparator forms the output end of the voltage comparison module, and the larger voltage of the current feedback voltage and the threshold voltage is respectively output to the trimming module and the control module CPU.
That is, one of the feedback voltage (i.e., the m-1 th ADC conversion result in fig. 6) detected by the first selector from the external load at the previous time and the system preset voltage (i.e., the threshold written by the CPU in fig. 6, which can be set by the control module CPU) is selected as the threshold voltage and stored in the second register, and then the current feedback voltage (i.e., the m-th ADC conversion result in fig. 6) is compared with the threshold voltage stored in the second register by the comparator, so as to obtain the comparison result.
If the result of the ADC of the m-1 th time is equal to or greater than the threshold voltage in the comparator process, the result of the ADC is stored in the second register as the threshold voltage for the next comparison. If the result of the ADC is less than the threshold voltage, no update is made (the frequency chase ends). If the result of the (m-1) th ADC is greater than or equal to the threshold voltage, after the (m) th ADC result is received, the (m) th ADC result is compared with the (m-1) th ADC result, because the (m-1) th ADC result is the comparison threshold value.
In this embodiment, the comparator is a digital comparator; the current feedback voltage of the digital signal output by the analog-to-digital converter ADC and the threshold voltage of the digital signal output by the control module CPU are compared through the digital comparator.
The frequency tracking can be determined to be completed by the control module CPU by feeding the comparison result to, in particular: the comparator compares the conversion result (namely the current feedback voltage) of the analog-to-digital converter ADC with the threshold voltage, and if the current feedback voltage is larger than or equal to the threshold voltage, the frequency tracking is continued; if the current feedback voltage < threshold voltage, frequency tracking ends. The control module CPU determines whether the frequency tracking is finished according to the signal.
The voltage comparison module is used for comparing the current feedback voltage with a threshold voltage. The threshold voltage is provided by the first selector, and the source of the threshold voltage is the feedback voltage written in by the control module CPU or in the last time. If the current feedback voltage is greater than the threshold voltage, then the current feedback voltage is taken as the threshold voltage for the next comparison.
As shown in fig. 4, in this embodiment, after receiving the conversion end signal sent by the analog-to-digital converter ADC, the trimming module Trimmer refreshes the value of the trimming signal by using the signal. The initial value and the end value of the trimming module Trimmer are set through the control module CPU.
As shown in fig. 7, in this embodiment, the trimming module Trimmer includes a third register, a fourth register, a fifth register, a second selector, a flip-flop, an exclusive or gate, and an adder;
the first input end of the second selector forms the first input end of the trimming module Trimmer, the input end of the third register forms the third input end of the trimming module Trimmer, and the input end of the fourth register forms the fourth input end of the trimming module Trimmer;
the output end of the third register is connected with the first input end of the trigger;
the output end of the fourth register is connected with the first end of the exclusive-or gate;
the output end of the flip-flop is respectively connected with the second end of the exclusive-or gate, the first input end of the fifth register, the second input end of the second selector and the first input end of the adder; the output end of the exclusive-or gate is connected with the second input end of the adder, and the output end of the adder is connected with the second input end of the flip-flop;
the third input end of the trigger and the second input end of the fifth register jointly form a second input end of the trimming module, and the second input end of the trimming module receives the conversion end signal;
the output end of the fifth register is connected with the third input end of the second selector;
and the output end of the second selector outputs the trimming signal.
In this embodiment, the values of the last group of trimming signals are stored by the fifth register (the trigger signal of the ADC is latched by the Timer module Timer).
The trimming module Trimmer has a group of second selectors, selects the value of the final output trimming signal according to the result of the voltage comparison module, and the oscillator module OSC with adjustable frequency adjusts the frequency of the output first clock signal CLK according to the trimming signal.
The specific operation process of the trimming module is as follows:
the initial value and the end value of the trimming signal are provided by a control module CPU, and a user can set the initial value and the end value of the trimming signal according to application requirements;
and when the m-1 time receives the ADC conversion end signal, the trimming value N-1 output by the trigger is stored in a fifth register, and the previously stored trimming value N-2 is transmitted to the second selector. The exclusive-or gate performs exclusive-or operation to determine whether the value of the trimming signal at that time reaches an end value (if the value of the trimming signal is equal to the end value, the calculation result is 0, and if the value of the trimming signal is not equal to the end value, the output result is 1. therefore, when the value of the trimming signal is not equal to the end value, the adder changes the value of the trimming signal +1 to N, and when the value of the trimming signal is equal to the end value, the trimming value is unchanged), the value of the trimming signal is transmitted to the flip-flop.
The input of the second selector is the value N-1 of the trimming signal and the value N-2 of the trimming signal, and the value of the trimming signal is selected according to the comparison result and is transmitted to the oscillator module OSC with adjustable frequency: if the current feedback voltage is larger than or equal to the threshold voltage, selecting the value N-1 of the trimming signal; if the current feedback voltage is smaller than the threshold voltage, selecting the value N-2 of the trimming signal;
and when receiving the ADC conversion end signal for the mth time, the trigger outputs the value N of the trimming signal, the value N of the trimming signal is stored in the fifth register, and the value N-1 of the trimming signal is transmitted to the second selector. The second selector selects the value of the trimming signal according to the result of the comparison module. Meanwhile, the value N of the trimming signal is transmitted to the exclusive-OR gate to judge whether the value N reaches the end value, and the judging method is the same as the mode of judging the value N-1 of the trimming signal and the value N-2 of the trimming signal.
As shown in fig. 8, in this embodiment, the timing module Timer includes a sixth register and a Timer (N-bit Timer), an input end of the sixth register constitutes an input end of the timing module Timer, an output end of the sixth register is connected to a first input end of the Timer, a second input end of the Timer is connected to the second clock signal, and an output end of the Timer constitutes an output end of the timing module Timer.
The timer is used for providing a working trigger signal of the analog-digital converter ADC, and the interval time preset by the corresponding system can be set through the control module CPU. And sending a signal to start the ADC to sample after the count overflows. The initial counting value of the timer is provided by the CPU, a user can set the initial value according to the actual application requirement, each counting clock counts once by the counter, and after the counting overflows, the timer sends a signal for starting the ADC. At the same time, the count value of the timer is restored to the initial value, and the next counting is continued (the initial value is set by the user).
In this embodiment, the oscillation module OSC having an adjustable frequency, the frequency divider DIV, the voltage comparison module, the trimming module Trimmer, the analog-to-digital converter ADC, the timing module Timer, and the control module CPU are integrated in a chip, which makes the circuit structure more integrated, and can effectively reduce peripheral devices, thereby reducing the cost.
The driving device of the atomization sheet can comprise the ultrasonic frequency tracking circuit of the humidifier, and the atomization module forms the external load.
The atomization plate driving device in the embodiment is based on a hardware structure, and the frequency sweeping process is realized through hardware, so that the efficiency is improved, and CPU resources can be left for other operations.
The ultrasonic frequency tracking circuit of the humidifier and the corresponding atomization plate driving device have the following working procedures:
1. the oscillator module OSC with adjustable frequency outputs a first clock signal CLK, and the initial value of the oscillator module OSC with adjustable frequency is written in by the control module CPU;
2. the frequency divider DIV divides the frequency of the first clock signal CLK to generate a clock signal CLK' (namely a resonant frequency) near a target frequency, then transmits the resonant frequency to the atomization module, and drives the atomization sheet to work through the atomization module;
3. after the atomization sheet works, the atomization module feeds back a voltage signal;
4. the timing module Timer sends signals at regular time according to a time interval set by the control module CPU, starts the analog-to-digital converter ADC at regular time, performs AD conversion on the feedback voltage, and samples the feedback voltage of the atomization module;
5. and the sampling result of the analog-to-digital converter ADC is transmitted to the voltage comparison module. The voltage comparison module compares the current feedback voltage with a threshold voltage and outputs a comparison result signal. The signal determines whether the frequency tracking process is finished. If the current feedback voltage is larger than the threshold voltage, taking the current feedback voltage as the threshold value of the next comparison, and updating the trimming value; if the current feedback voltage is smaller than the threshold voltage, ending the frequency tracking process;
6. the trimming module Trimmer updates a trimming result according to a conversion end signal generated by the analog-to-digital converter ADC;
7. the frequency-adjustable oscillation module outputs a new first clock signal CLK according to the new trimming signal;
8. and (5) circulating the steps 1-7 until the step 5 outputs an end signal, finishing the locking of the trimming value and ending the frequency tracking process.
It should be noted that the above-mentioned process can be directly performed by a hardware structure, and no additional software program is needed for control.
The utility model discloses an among ultrasonic wave of humidifier chases after circuit and corresponding atomizing piece drive arrangement frequently, because the circuit include frequency adjustable oscillation module, frequency divider, voltage comparison module and trimming module Trimmer, realize the adjustment to output resonant frequency through hardware structure, the process of chasing after frequently is accomplished by hardware, after having disposed relevant parameter, only need to enable to pursue frequently the function just can accomplish and pursue frequently, do not occupy the CPU resource, CPU can carry out other operations in this section time, effectively compromise frequency modulation's flexibility and rapidity, a large amount of calculations of CPU have been avoided. The ultrasonic frequency tracking circuit of the humidifier and the corresponding atomization plate driving device have the characteristics of good performance, simple structure, easiness in operation, flexibility, good performance and low cost.
The utility model discloses an among humidifier's ultrasonic wave frequency tracking circuit and corresponding atomizing piece drive arrangement technical scheme, wherein each functional module and the modular unit that include all can correspond to the specific hardware circuit in the integrated circuit structure, consequently only relate to the improvement of specific hardware circuit, the hardware part is not merely the carrier that belongs to execution control software or computer program, consequently solves corresponding technical problem and obtains corresponding technical effect and also does not relate to the application of any control software or computer program, that is to say, the utility model discloses only utilize the improvement in the aspect of the hardware circuit structure that these modules and units relate to can solve the technical problem that will solve to obtain corresponding technical effect, and need not assist and can realize corresponding function with specific control software or computer program.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (10)
1. An ultrasonic frequency-following circuit of a humidifier, the circuit comprising:
the frequency-adjustable oscillation module is used for outputting a first clock signal;
the frequency divider generates a corresponding resonant frequency according to the received first clock signal, and the output end of the frequency divider transmits the resonant frequency to an external load;
a voltage comparison module, a first input end of which is configured to receive a current feedback voltage obtained from the external load, the voltage comparison module being configured to compare the current feedback voltage with a threshold voltage, and an output end of the voltage comparison module being configured to output a larger voltage of the current feedback voltage and the threshold voltage as a comparison result, wherein a magnitude of the current feedback voltage is determined by a magnitude of a resonant frequency currently transmitted to the external load by the frequency divider, the threshold voltage is the feedback voltage detected from the external load at a previous time, and an initial value of the threshold voltage is a system preset voltage;
and a first input end of the trimming module is connected with the output end of the voltage comparison module and is used for generating a trimming signal according to the comparison result output by the voltage comparison module, so that the frequency-adjustable oscillation module can adjust the first clock signal according to the trimming signal.
2. The ultrasonic frequency-following circuit of the humidifier according to claim 1, wherein the frequency-adjustable oscillation module comprises a decoding unit, N switches, a resistor string, a capacitor, a charging and discharging unit and a shaping unit, wherein the resistor string is connected in series with the capacitor and then grounded;
the resistor string comprises N +1 resistors connected in series, wherein a node between every two adjacent resistors in the resistor string is connected with a first end of a first resistor in the resistor string through a corresponding switch, the first end of the first resistor is connected with a power supply end of the frequency-adjustable oscillation module, and the first end of the first resistor is one end of one resistor in the resistor string which is farthest away from the ground and is not connected with other resistors;
the input end of the decoding unit receives the trimming signal, and N output ends of the decoding unit are respectively connected with the control ends of N switches;
one end of the resistor string adjacent to the capacitor, which is not connected with the capacitor, is connected with the input end of the shaping unit through the charging and discharging unit, and the output end of the shaping unit is used for outputting the first clock signal.
3. The ultrasonic frequency tracking circuit of a humidifier according to claim 1, wherein said circuit further comprises:
the first input end of the analog-to-digital converter is used for converting the analog signal of the current feedback voltage acquired from the external load into a digital signal, the first output end of the analog-to-digital converter is used for transmitting the digital signal of the current feedback voltage to the first input end of the voltage comparison module, the analog-to-digital converter generates a conversion end signal after converting the analog signal of the current feedback voltage into the digital signal, and the second output end of the analog-to-digital converter sends the conversion end signal to the second input end of the trimming module.
4. An ultrasonic frequency tracking circuit of a humidifier according to claim 3, wherein said circuit further comprises:
and the output end of the timing module is connected with the second input end of the analog-to-digital converter and used for triggering the analog-to-digital converter to acquire the current feedback voltage from the external load at preset system interval time.
5. The ultrasonic frequency tracking circuit of the humidifier according to claim 4, wherein the circuit further comprises a control module;
the first output end of the control module is connected with the second input end of the voltage comparison module and is used for providing the threshold voltage for the voltage comparison module;
the second output end of the control module is connected with the third input end of the trimming module and used for providing an initial value of the trimming signal for the trimming module;
the third output end of the control module is connected with the fourth input end of the trimming module and used for providing the end value of the trimming signal for the trimming module;
the fourth output end of the control module is connected with the input end of the timing module and is used for setting the interval time preset by the system of the timing module;
the input end of the control module is connected with the output end of the voltage comparison module.
6. The ultrasonic frequency-chasing circuit of the humidifier according to claim 5, wherein the voltage comparison module comprises a first selector, a comparator, a first register and a second register;
the first input end of the comparator forms the first input end of the voltage comparison module;
a first input terminal of the first selector is connected to the feedback voltage detected from the external load at the previous time, an input terminal of the first register is connected to the system preset voltage, an output terminal of the first register is connected to a second input terminal of the first selector, an output terminal of the first selector is connected to a second input terminal of the comparator through a second register, and an output terminal of the comparator is connected to a third input terminal of the first selector;
and the output end of the comparator forms the output end of the voltage comparison module.
7. The ultrasonic frequency-chasing circuit of the humidifier according to claim 5, wherein the trimming module comprises a third register, a fourth register, a fifth register, a second selector, a flip-flop, an exclusive-or gate and an adder;
the first input end of the second selector forms the first input end of the trimming module, the input end of the third register forms the third input end of the trimming module, and the input end of the fourth register forms the fourth input end of the trimming module;
the output end of the third register is connected with the first input end of the trigger;
the output end of the fourth register is connected with the first end of the exclusive-or gate;
the output end of the flip-flop is respectively connected with the second end of the exclusive-or gate, the first input end of the fifth register, the second input end of the second selector and the first input end of the adder; the output end of the exclusive-or gate is connected with the second input end of the adder, and the output end of the adder is connected with the second input end of the flip-flop;
the third input end of the trigger and the second input end of the fifth register jointly form a second input end of the trimming module;
the output end of the fifth register is connected with the third input end of the second selector;
and the output end of the second selector outputs the trimming signal.
8. An ultrasonic frequency-tracking circuit of a humidifier according to claim 5, wherein the timing module comprises a sixth register and a timer, an input terminal of the sixth register constitutes an input terminal of the timing module, an output terminal of the sixth register is connected to a first input terminal of the timer, a second input terminal of the timer is connected to the second clock signal, and an output terminal of the timer constitutes an output terminal of the timing module.
9. The ultrasonic frequency-chasing circuit of the humidifier according to any one of claims 1 to 5, wherein the frequency-adjustable oscillation module, the frequency divider, the voltage comparison module, the trimming module, the analog-to-digital converter, the timing module and the control module are integrated in a chip.
10. An atomization plate driving device, which is characterized in that the device comprises an ultrasonic frequency following circuit of the humidifier according to any one of claims 1 to 9, and the atomization module forms the external load.
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