CN210832398U - Water shortage detection system and atomizer - Google Patents
Water shortage detection system and atomizer Download PDFInfo
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- CN210832398U CN210832398U CN201921111977.5U CN201921111977U CN210832398U CN 210832398 U CN210832398 U CN 210832398U CN 201921111977 U CN201921111977 U CN 201921111977U CN 210832398 U CN210832398 U CN 210832398U
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Abstract
The embodiment of the utility model provides a lack of water detecting system and atomizer. The water shortage detection system comprises a switch control circuit, an atomization driving circuit, a feedback circuit and a main control circuit. The switch control generates a drive control voltage from the power supply voltage. The atomization driving circuit receives the power supply voltage and the driving control voltage and maintains the working current of the atomization sheet according to the power supply voltage and the driving control voltage. The feedback circuit detects the driving control voltage, detects the working current of the atomization sheet and generates the actual working voltage of the atomization driving circuit according to the working current. The main control circuit receives the driving control voltage output by the first output end of the feedback circuit and the actual working voltage of the atomization driving circuit output by the second output end of the feedback circuit, generates a switch control signal according to the driving control voltage and the actual working voltage of the atomization driving circuit, and provides the switch control signal for the switch control circuit, so that the switch control circuit adjusts the driving control voltage according to the switch control signal.
Description
Technical Field
The utility model relates to a humidification equipment technical field especially relates to a lack of water detecting system and atomizer.
Background
The aromatherapy atomizer serving as a small household appliance is widely used at home, has good effects of purifying air and keeping air fresh, and is popular among people.
The existing aromatherapy atomizer is often damaged because water is forgotten to be added in the using process. To solve this problem, conventional water shortage detection technologies are currently classified into contact type and non-contact type detection technologies. Wherein, the water level detection technique of conventional contact needs extra measuring electrode and need install in the container with water direct contact, has increased the production and processing complexity, and measuring electrode and water direct contact, and easy damage leads to the product to appear inefficacy trouble easily. The conventional non-contact detection scheme detection system is composed of a current detection circuit or a capacitance capacity detection circuit, and due to the fact that the working current or capacitance capacity of the system is changed greatly during working, the error of a water shortage detection result is large, the consistency of products is poor, and therefore mass production is difficult to achieve.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model provides a lack of water detecting system and atomizer.
The utility model provides a lack of water detecting system, include:
the first end of the switch control circuit is connected with a power supply, and the second input end of the switch control circuit is grounded and used for receiving the power supply voltage and generating a driving control voltage according to the power supply voltage;
the first input end of the atomization driving circuit is connected with the power supply, and the second input end of the atomization driving circuit is electrically connected with the first output end of the switch control circuit and is used for receiving the power supply voltage and the drive control voltage and maintaining the working current of the atomization sheet according to the power supply voltage and the drive control voltage;
a first input end of the feedback circuit is electrically connected with a second output end of the switch control circuit, a second input end of the feedback circuit is electrically connected with an output end of the atomization driving circuit, and the feedback circuit is used for detecting the driving control voltage and the working current of the atomization piece, generating the actual working voltage of the atomization driving circuit according to the working current of the atomization piece, and outputting the actual working voltage and the actual working current respectively; and
the first input end of the master control circuit is electrically connected with the first output end of the feedback circuit, the second input end of the master control circuit is electrically connected with the second output end of the feedback circuit, the first output end of the master control circuit is electrically connected with the third input end of the switch control circuit and is used for receiving the driving control voltage output by the first output end of the feedback circuit and the actual working voltage of the atomization driving circuit output by the second output end of the feedback circuit and providing the actual working voltage of the atomization driving circuit with a switch control signal, so that the switch control circuit adjusts the size of the driving control voltage according to the switch control signal.
In one embodiment, the switch control circuit includes:
a first input end of the switch branch circuit is electrically connected with the power supply, a second input end of the switch branch circuit is grounded, and a third end input end of the switch branch circuit is electrically connected with a first output end of the main control circuit and is used for providing the power supply voltage according to a switch control signal; and
the generation branch circuit comprises a generation branch circuit, a first input end of the generation branch circuit and an output end of a switch branch circuit are electrically connected, a second input end of the generation branch circuit is grounded, a first output end of the generation branch circuit is electrically connected with a second input end of the atomization driving circuit, a second output end of the generation branch circuit is electrically connected with a first input end of the feedback circuit and used for receiving the power supply voltage, and the driving control voltage is generated according to the power supply voltage.
In one embodiment, the feedback circuit comprises:
the input end of the first feedback branch circuit is electrically connected with the second output end of the generating branch circuit, the second input end of the first feedback branch circuit is grounded, and the output end of the first feedback branch circuit is electrically connected with the first input end of the main control circuit and is used for detecting and outputting the driving control voltage; and
the first input end of the second feedback branch circuit is electrically connected with the output end of the atomization driving circuit, the second input end of the second feedback branch circuit is grounded, the output end of the second feedback branch circuit is electrically connected with the second input end of the main control circuit and used for detecting the working current in the atomization driving circuit and generating the actual working voltage of the atomization driving circuit according to the working current of the atomization piece.
In one embodiment, the switching branch comprises:
the source electrode of the switching tube Q1 is connected with the power supply, and the drain electrode of the switching tube Q1 is electrically connected with the first input end of the generating branch circuit;
a resistor R1, having a first end electrically connected to the power supply and the source of the switch, and a second end electrically connected to the gate of the switch transistor Q1;
a resistor R2, a first end of which is electrically connected with the grid of the switch tube Q1 and a second end of the resistor R1;
a resistor R3, a first end of which is electrically connected with the second end of the resistor R2;
the drain electrode of the switching tube Q2 is electrically connected with the second end of the resistor R3, and the source electrode of the switching tube Q2 is grounded;
a resistor R4, the first end of which is electrically connected with the grid of the switch tube Q2, and the second end of which is grounded; and
and a first end of the resistor R5 is electrically connected with the first end of the resistor R4 and the gate of the switching tube Q2, and a second end of the resistor R5 is electrically connected with the first output end of the main control circuit.
In one embodiment, the generating the branch comprises:
a resistor R6, the first end of which is electrically connected with the drain electrode of the switch tube Q1;
a resistor R7, wherein the first end is electrically connected with the second end of the resistor R6, and the second end is grounded;
a capacitor C1, a first end of which is electrically connected with the first end of the resistor R7 and the second end of the resistor R6, and the second end of which is grounded;
a resistor R8, a first end of which is electrically connected to the first end of the capacitor C1, the first end of the resistor R7 and the second end of the resistor R6 respectively;
a resistor R9, a first end of which is electrically connected with the second end of the resistor R8;
the resistor R10 is connected in parallel with two ends of the resistor R8; and
and a first end of the inductor L1 is electrically connected with a second end of the resistor R9, and a second end of the inductor L1 is electrically connected with a second input end of the atomization driving circuit.
In one embodiment, the atomization driving circuit includes:
a capacitor C3, a first end of which is connected with the power supply;
a resistor R11, a first terminal of which is electrically connected to the second terminal of the capacitor C3, and a second terminal of which is electrically connected to the second terminal of the inductor L1;
a resistor R12 connected in parallel to two ends of the resistor R11, a first end of the resistor R12 is electrically connected to the second end of the capacitor C3 and the first end of the resistor R11, and a second end of the resistor R8938 is electrically connected to the second end of the inductor L1 and the second end of the resistor R11;
a capacitor C4, a first end of which is electrically connected to the second end of the inductor L1, the second end of the resistor R11 and the second end of the resistor R12, respectively, and a second end of which is connected to the atomizing sheet;
a capacitor C5, a first terminal of which is electrically connected to the first terminal of the capacitor C4, the second terminal of the inductor L1, the second terminal of the resistor R11 and the second terminal of the resistor R12, respectively;
a switch Q3 having a drain electrically connected to the power supply and the first end of the capacitor C3, and a gate electrically connected to the second end of the capacitor C3, the first end of the resistor R11, and the first end of the resistor R12, respectively;
an inductor L2, a first end of which is electrically connected to the source of the switching transistor Q3, and a second end of which is electrically connected to the first input end of the second feedback branch and the second end of the capacitor C5; and
a capacitor C6, a first end of which is electrically connected to the power supply, the drain of the switch Q3, and a first end of the capacitor C3, respectively, and a second end of which is electrically connected to the second end of the inductor L2, the capacitor C5, and the first input end of the second feedback branch.
In one embodiment, the first feedback circuit includes:
a resistor R13, a first end of which is electrically connected with the second end of the resistor R8, the second end of the resistor R10 and the first end of the resistor R9 respectively; and
a capacitor C7, wherein the first end is electrically connected with the second end of the resistor R13, and the second end is grounded;
the second feedback circuit includes:
an inductor L3, a first terminal of which is electrically connected to the second terminal of the inductor L2, the second terminal of the capacitor C5 and the second terminal of the capacitor C6, respectively;
the first end of the resistor R14 is electrically connected with the second end of the inductor L3, and the second end of the resistor R14 is grounded;
a resistor R15, a first terminal of which is electrically connected to the first terminal of the resistor R14 and the second terminal of the inductor L3;
a resistor R16, a first end of which is electrically connected with the second end of the resistor R15, and a second end of which is electrically connected with the second input end of the main control circuit;
a capacitor C8, a first end of which is electrically connected with the second end of the resistor R15 and the first end of the resistor R16, and a second end of which is grounded; and
and a first end of the capacitor C9 is electrically connected with the second input end of the main control circuit and the second end of the resistor R16, and the second end is grounded.
In one embodiment, the master control circuit includes a microprocessor, a first input terminal of the microprocessor is electrically connected to the first terminal of the resistor R13 and the first terminal of the capacitor C7, a second input terminal of the microprocessor is electrically connected to the first terminal of the capacitor C9 and the second terminal of the resistor R16, and a first output terminal of the microprocessor is electrically connected to the second terminal of the resistor R5.
In one embodiment, the water shortage detection system further includes a wind control circuit, a first input end of the wind control circuit is connected to the power supply, a second input end of the wind control circuit is electrically connected to a second input end of a main control circuit, an input end of the wind control circuit is connected to the fan, and the wind control circuit is configured to receive the power supply voltage and a wind control command provided by the main control circuit, and provide the power supply voltage to the fan according to the wind control command, where the wind control circuit includes:
a resistor R17, wherein the first end of the resistor R17 is electrically connected with the second output end of the main control circuit;
a resistor R18, wherein the first end of the resistor R17 is electrically connected with the second end, and the second end is grounded;
a switch tube Q4, the grid electrode of which is electrically connected with the second end of the resistor R17 and the first end of the resistor R18, the drain electrode of which is connected with the fan, and the source electrode of which is grounded; and
and the resistor R19 has a first end connected with the power supply and a second end electrically connected with the fan.
Based on the same inventive concept, the utility model also provides an atomizer, the atomizer includes the lack of water detecting system of any above-mentioned embodiment.
To sum up, the embodiment of the utility model provides a lack of water detecting system and atomizer. The water shortage detection system comprises a switch control circuit, an atomization driving circuit, a feedback circuit and a main control circuit. The first end of the switch control circuit is connected with a power supply, and the second input end of the switch control circuit is grounded and used for receiving the power supply voltage and generating a driving control voltage according to the power supply voltage. The first input end of the atomization driving circuit is connected with the power supply, and the second input end of the atomization driving circuit is electrically connected with the first output end of the switch control circuit and used for receiving the power supply voltage and the drive control voltage and maintaining the working current of the atomization piece according to the power supply voltage and the drive control voltage. The first input end of the feedback circuit is electrically connected with the second output end of the switch control circuit, the second input end of the feedback circuit is electrically connected with the output end of the atomization driving circuit and used for detecting the driving control voltage and the working current of the atomization sheet, and the actual working voltage of the atomization driving circuit is generated according to the working current of the atomization sheet and is respectively output. The first input end of the main control circuit is electrically connected with the first output end of the feedback circuit, the second input end of the main control circuit is electrically connected with the second output end of the feedback circuit, the first output end of the main control circuit is electrically connected with the third input end of the switch control circuit and is used for receiving the driving control voltage output by the first output end of the feedback circuit and the actual working voltage of the atomization driving circuit output by the second output end of the feedback circuit, and the switch control signal is generated according to the driving control voltage and the actual working voltage of the atomization driving circuit and provided for the switch control circuit, so that the switch control circuit adjusts the size of the driving control voltage according to the switch control signal. The utility model discloses in, gather drive control voltage through feedback circuit with atomization drive circuit's actual operating voltage to feed back to master control circuit, so that master control circuit basis drive control voltage with whether atomization drive circuit's actual operating voltage judges and is in the state of lacking water at present, and generate on-off control signal according to the judged result, so that on-off control circuit can generate drive control voltage's size according to on-off control signal adjustment, and then utilize drive control voltage control atomization drive circuit's operating condition to realize the automated inspection of lack of water. The embodiment of the utility model provides a voltage dynamic judgement through the operating point that detects atomizing drive circuit is in the water shortage state, adopts non-contact's water shortage detection technique to replace the water shortage detection technique of traditional contact promptly, need not to install water shortage detection electrode, safe and reliable. And, the embodiment of the utility model provides a drive control voltage through feedback control atomizing drive current, can maintain the operating current of atomizing piece and last stable, make the actual operating current of atomizing piece when normal work remain stable, and realize developments according to actual work and drive control voltage, it is quick, the judgement of accurate water shortage state, because the operating voltage and the actual operating current of atomizing piece are stable, consequently, the testing result error is less, the performance is more reliable and more stable, the product uniformity is good, be convenient for mass production, it is big to have solved operating current or the change of electric capacity among the conventional non-contact detection technique at present, the problem that is difficult to mass production is caused to water shortage detection error and product uniformity difference etc.
Drawings
Fig. 1 is a schematic structural diagram of a water shortage detection system provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another water shortage detection system provided in the embodiment of the present invention;
fig. 3 is an electrical schematic diagram of a microprocessor chip according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a water shortage detection system, which includes a switch control circuit 100, an atomization driving circuit 200, a feedback circuit 300, and a main control circuit 400.
The first end of the switch control circuit 100 is connected to a power supply, and the second input end of the switch control circuit is grounded, and is configured to receive the power supply voltage and generate a driving control voltage according to the power supply voltage.
The first input end of the atomization driving circuit 200 is connected with the power supply, and the second input end of the atomization driving circuit 200 is electrically connected with the first output end of the switch control circuit 100, and is used for receiving the power supply voltage and the drive control voltage and maintaining the working current of the atomization plate according to the power supply voltage and the drive control voltage.
The first input end of the feedback circuit 300 is electrically connected with the second output end of the switch control circuit 100, the second input end of the feedback circuit 300 is electrically connected with the output end of the atomization driving circuit 200, and is used for detecting the driving control voltage and detecting the working current of the atomization plate, and according to the working current of the atomization plate, the actual working voltage of the atomization driving circuit is generated and respectively output.
A first input terminal of the master control circuit 400 is electrically connected to a first output terminal of the feedback circuit 300, a second input terminal of the master control circuit 400 is electrically connected to a second output terminal of the feedback circuit 300, a first output terminal of the main control circuit 400 is electrically connected to a third input terminal of the switch control circuit 100, for receiving the driving control current outputted from the first output terminal of the feedback circuit 300, and the actual working voltage outputted by the second output terminal of the feedback circuit 300, and the actual working voltage of the atomization driving circuit outputted by the second output terminal of the feedback circuit, and generates a switching control signal according to the driving control voltage and the actual working voltage of the atomization driving circuit, and provides the switching control signal to the switching control circuit 100, so that the switch control circuit 100 adjusts the magnitude of the driving control voltage according to the switch control signal.
It can be understood that the driving control voltage and the actual working voltage of the atomization driving circuit are collected through the feedback circuit 300 and fed back to the main control circuit 400, so that the main control circuit 400 judges whether the atomization driving circuit is in the water shortage state or not according to the driving control voltage and the actual working voltage, generates a switch control signal according to a judgment result, generates the driving control voltage for the switch control circuit 100 through the switch control signal control, and then controls the working state of the atomization driving circuit 200 by utilizing the driving control voltage, thereby realizing the automatic detection of water shortage. In this embodiment, be provided with interface P1 in atomizing drive current, connect the atomizing piece through interface P1, during the atomizer work that moisture is sufficient, the operating current of atomizing piece is great, drive control current is less than the operating current of atomizing piece, promptly drive control voltage is less than atomizing drive circuit's actual operating voltage, and main control circuit 400 outputs the on-off control signal of high level, in order to control atomizing drive circuit 200 normally works. When moisture is absent, the working current of the atomizing plate is small, the driving control current is larger than the working current of the atomizing plate, namely, the driving control voltage is larger than the actual working voltage of the atomizing drive circuit, the main control circuit 400 outputs a low-level switch control signal at the moment, so that the switch control circuit 100 is disconnected, the output driving control voltage is 0, and the atomizing drive circuit 200 stops working, so that the atomizer is prevented from being burnt out. In addition, the water shortage detection system in the embodiment does not need to be provided with a detection electrode independently, so that the design complexity and the failure rate are reduced, the product quality is improved, and the production cost is reduced. In addition, in the embodiment, the atomization driving circuit 200 can maintain the working current of the atomization plate, so that the working current of the atomization plate is kept stable, the water shortage state can be dynamically, quickly and accurately determined, the detection result error is small, the product performance is stable and reliable, the consistency is good, mass production is convenient to realize, and the problems that the working current or the capacitance in the conventional non-contact detection technology is large in change, large in discreteness, poor in consistency and difficult to mass production are solved.
In one embodiment, the switch control signal is a pulse width modulation signal. It can be understood that, when the switch control signal is a pulse width modulation signal, the width of the pulse width modulation signal can be adjusted to control the magnitude of the driving control voltage generated by the switch control circuit 100, so that the operating state of the atomization driving circuit 200 is maintained, and the operating current of the atomization sheet is maintained to be stable by the atomization driving circuit 200.
In one embodiment, the switch control circuit 100 includes a switching branch 110 and a generating branch 120.
The first input end of the switching branch circuit 110 is electrically connected to the power supply, the second input end of the switching branch circuit 110 is grounded, and the third input end of the switching branch circuit 110 is electrically connected to the first output end of the main control circuit 400, and is configured to provide the power supply voltage according to a switching control signal.
The first input end of the generating branch 120 is electrically connected to the output end of the switching branch 110, the second input end of the generating branch 120 is grounded, the first output end of the generating branch 120 is electrically connected to the second input end of the atomization driving circuit 200, and the second output end of the generating branch 120 is electrically connected to the first input end of the feedback circuit 300, and is configured to receive the power voltage and generate the driving control voltage according to the power voltage.
In this embodiment, since the switching control signal is a pulse width modulation signal, when the water is sufficient, the main control circuit 400 outputs a high-level switching control signal, the switching branch circuit 110 is turned on according to the switching control signal, the voltage provided to the generating branch circuit 120 is an ac voltage, and then the ac voltage is converted into a driving control voltage of a dc voltage by the generating branch circuit 120 and is provided to the atomization driving circuit 200. Wherein the magnitude of the DC voltage is in direct proportion to the duty ratio of the pulse width modulation signal.
In one embodiment, the feedback circuit 300 includes a first feedback branch 310 and a second feedback branch 320.
The input end of the first feedback branch 310 is electrically connected to the second output end of the generating branch 120, the second input end of the first feedback branch 310 is grounded, and the output end of the first feedback branch 310 is electrically connected to the first input end of the main control circuit 400, and is configured to detect and output the driving control current.
The first input end of the second feedback branch 320 is electrically connected to the output end of the atomization driving circuit 200, the second input end of the second feedback branch 320 is grounded, the output end of the second feedback branch 320 is electrically connected to the second input end of the main control circuit 400, and the second feedback branch is used for detecting the working current in the atomization driving circuit 200 and generating the actual working voltage of the atomization driving circuit according to the working current of the atomization piece.
In this embodiment, the first feedback branch 310 detects and feeds back the driving control voltage, the second feedback branch 320 detects the working current in the atomization driving circuit 200, and generates the actual working voltage of the atomization driving circuit according to the working current of the atomization plate, and provides the actual working voltage to the main control circuit 400, so that the main control circuit 400 can determine whether the atomization driving circuit is in the water shortage state according to the control voltage and the actual working voltage of the atomization driving circuit.
In one embodiment, the switching branch 110 includes:
a switching tube Q1, having a source connected to the power supply and a drain electrically connected to the first input terminal of the generating branch 120;
a resistor R1, having a first end electrically connected to the power supply and the source of the switch, and a second end electrically connected to the gate of the switch transistor Q1;
a resistor R2, a first end of which is electrically connected with the grid of the switch tube Q1 and a second end of the resistor R1;
a resistor R3, a first end of which is electrically connected with the second end of the resistor R2;
the drain electrode of the switching tube Q2 is electrically connected with the second end of the resistor R3, and the source electrode of the switching tube Q2 is grounded;
a resistor R4, the first end of which is electrically connected with the grid of the switch tube Q2, and the second end of which is grounded; and
a resistor R5, a first end of which is electrically connected to the first end of the resistor R4 and the gate of the switching transistor Q2, and a second end of which is electrically connected to the first output end of the main control circuit 400.
In this embodiment, the switching tube Q1, the switching tube Q2, the resistor R1, the resistor R2, the resistor R4, and the resistor R5 may be replaced by an integrated chip PUMD10, which simplifies the design complexity and simultaneously functions as a switch. The switch tube Q1 is a P-type switch tube, and the switch tube Q2 is an N-type switch tube.
In one embodiment, the generating branch 120 includes:
a resistor R6, the first end of which is electrically connected with the drain electrode of the switch tube Q1;
a resistor R7, wherein the first end is electrically connected with the second end of the resistor R6, and the second end is grounded;
a capacitor C1, a first end of which is electrically connected with the first end of the resistor R7 and the second end of the resistor R6, and the second end of which is grounded;
a resistor R8, a first end of which is electrically connected to the first end of the capacitor C1, the first end of the resistor R7 and the second end of the resistor R6 respectively;
a resistor R9, a first end of which is electrically connected with the second end of the resistor R8;
the resistor R10 is connected in parallel with two ends of the resistor R8; and
and a first end of the inductor L1 is electrically connected to the second end of the resistor R9, and a second end of the inductor L1 is electrically connected to the second input end of the atomization driving circuit 200.
In this embodiment, the ac voltage provided by the switching branch 110 is converted into a dc voltage through the inductor L1, and is provided to the atomization driving circuit 200. The converted dc voltage changes with a change in the duty ratio of the switching control signal, and the larger the duty ratio of the switching control signal is, the larger the dc voltage is, that is, the larger the driving control voltage is.
The atomization driving circuit 200 includes:
a capacitor C3, a first end of which is connected with the power supply;
a resistor R11, a first terminal of which is electrically connected to the second terminal of the capacitor C3, and a second terminal of which is electrically connected to the second terminal of the inductor L1;
a resistor R12 connected in parallel to two ends of the resistor R11, a first end of the resistor R12 is electrically connected to the second end of the capacitor C3 and the first end of the resistor R11, and a second end of the resistor R8938 is electrically connected to the second end of the inductor L1 and the second end of the resistor R11;
a capacitor C4, a first end of which is electrically connected to the second end of the inductor L1, the second end of the resistor R11 and the second end of the resistor R12, respectively, and a second end of which is connected to the atomizing sheet;
a capacitor C5, a first terminal of which is electrically connected to the first terminal of the capacitor C4, the second terminal of the inductor L1, the second terminal of the resistor R11 and the second terminal of the resistor R12, respectively;
a switch Q3 having a drain electrically connected to the power supply and the first end of the capacitor C3, and a gate electrically connected to the second end of the capacitor C3, the first end of the resistor R11, and the first end of the resistor R12, respectively;
an inductor L2, a first terminal of which is electrically connected to the source of the switching transistor Q3, and a second terminal of which is electrically connected to the first input terminal of the second feedback branch 320 and the second terminal of the capacitor C5; and
a capacitor C6, a first terminal of which is electrically connected to the power supply, the drain of the switching transistor Q3, and a first terminal of the capacitor C3, respectively, and a second terminal of which is electrically connected to the second terminal of the inductor L2, the capacitor C5, and the first input terminal of the second feedback branch 320.
In this embodiment, the capacitor C3, the capacitor C4, the capacitor C5, the inductor L2, and the switching tube Q3 constitute a self-excited three-point oscillation circuit, and the voltage of the operating point of the oscillation circuit changes significantly when water is short or not short, so that the voltage of the operating point of the oscillation circuit can be detected, and the voltage of the operating point of the oscillation circuit can be fed back by collecting the operating current of the atomizing plate, thereby determining whether the current state is in a water-short state.
In one embodiment, the first feedback circuit 300 comprises:
a resistor R13, a first end of which is electrically connected with the second end of the resistor R8, the second end of the resistor R10 and the first end of the resistor R9 respectively; and
and a first end of the capacitor C7 is electrically connected with the second end of the resistor R13, and the second end is grounded.
In one embodiment, the second feedback circuit 300 comprises:
an inductor L3, a first terminal of which is electrically connected to the second terminal of the inductor L2, the second terminal of the capacitor C5 and the second terminal of the capacitor C6, respectively;
the first end of the resistor R14 is electrically connected with the second end of the inductor L3, and the second end of the resistor R14 is grounded;
a resistor R15, a first terminal of which is electrically connected to the first terminal of the resistor R14 and the second terminal of the inductor L3;
a resistor R16, a first end of which is electrically connected to the second end of the resistor R15, and a second end of which is electrically connected to the second input end of the main control circuit 400;
a capacitor C8, a first end of which is electrically connected with the second end of the resistor R15 and the first end of the resistor R16, and a second end of which is grounded; and
a capacitor C9, a first end electrically connected to the second input end of the main control circuit 400 and the second end of the resistor R16, and a second end grounded.
It can be understood that the inductor has a function of passing direct current and alternating current, and the inductor L3 is an enhanced inductor in this embodiment, so that not only the alternating current component of the current in the atomization driving circuit 200 can be filtered out through the inductor L3, but also the working current is amplified.
In one embodiment, the main control circuit 400 includes a microprocessor, a first input terminal of the microprocessor is electrically connected to the first terminal of the resistor R13 and the first terminal of the capacitor C7, a second input terminal of the microprocessor is electrically connected to the first terminal of the capacitor C9 and the second terminal of the resistor R16, and a first output terminal of the microprocessor is electrically connected to the second terminal of the resistor R5.
In this embodiment, the microprocessor is an AD type microprocessor chip, such as CMS89F11X (where X denotes the numbers 1, 2, 3 and 6) series of mesomicrochips. Referring to fig. 3, the operation principle of the chip CMS89F113 is described as an example, the chip CMS89F113 has 16 pins, wherein pins 1 and 16 are used for connecting an operating voltage of 5V, pin 14 is electrically connected to the second terminal of the resistor R16 and the first terminal of the capacitor C9 for receiving the operating current of the atomizing plate, and pin 15 is electrically connected to the second terminal of the resistor R13 and the first terminal of the capacitor C7 for receiving the driving control voltage. Chip CMS89F113 is built-in to have a comparator, and the positive input end and the pin 14 of comparator are electrically connected, and negative input end and pin 15 are electrically connected, and when drive control voltage is less than the actual operating voltage of atomizing piece, then current moisture is sufficient in the judgement atomizer, can normally work, the on-off control signal of output high level this moment. In addition, pin 11 of the chip CMS89F113 is also configured to receive the actual operating voltage of the atomization driving circuit, and the chip CMS89F113 adjusts the duty ratio of the switching control signal according to the magnitude of the actual operating voltage of the atomization driving circuit received at pin 11, so as to enable the operating frequency of the self-excited oscillation current to maintain the normal operating current of the atomization plate.
In one embodiment, the water shortage detection system further includes a wind control circuit 500, a first input end of the wind control circuit 500 is connected to the power supply, a second input end of the wind control circuit 500 is electrically connected to a second input end of the main control circuit 400, an input end of the wind control circuit 500 is connected to the fan, and is configured to receive the power supply voltage and a wind control command provided by the main control circuit 400, provide the power supply voltage to the fan according to the wind control command, and accelerate the flow of air by the fan. In this embodiment, the air control circuit is provided with an interface P2, and is connected to the fan through an interface P2.
In one embodiment, the wind control circuit 500 includes:
a resistor R17, a first end of which is electrically connected to the second output end of the main control circuit 400;
a resistor R18, wherein the first end of the resistor R17 is electrically connected with the second end, and the second end is grounded;
a switch tube Q4, the grid electrode of which is electrically connected with the second end of the resistor R17 and the first end of the resistor R18, the drain electrode of which is connected with the fan, and the source electrode of which is grounded; and
and the resistor R19 has a first end connected with the power supply and a second end electrically connected with the fan.
In this embodiment, the resistor R17, the resistor R18, and the switch Q4 may be replaced by a bias resistor transistor, such as an LMUN2232LTIG transistor, to simplify the circuit design.
Based on the same inventive concept, the utility model also provides an atomizer, the atomizer includes the lack of water detecting system of any above-mentioned embodiment.
To sum up, the utility model provides an among water shortage detection system and the atomizer, through feedback circuit 300 gather voltage with atomizing drive circuit's actual operating voltage to the main control circuit 400 is given back to, so that main control circuit 400 basis drive control voltage with atomizing drive circuit's actual operating voltage judges whether currently is in the water shortage state, and generates on-off control signal according to the judged result, so that on-off control circuit 100 can generate drive control voltage's size according to on-off control signal adjustment, and then utilizes drive control voltage control atomizing drive circuit 200's operating condition, thereby realizes the automated inspection of water shortage. The embodiment of the utility model provides a voltage dynamic judgement through the operating point that detects atomizing drive circuit is in the water shortage state, adopts non-contact's water shortage detection technique to replace the water shortage detection technique of traditional contact promptly, need not to install water shortage detection electrode, safe and reliable. And, the embodiment of the utility model provides a drive control voltage through feedback control atomizing drive current, can maintain the operating current of atomizing piece and last stable, make the actual operating current of atomizing piece when normal work remain stable, and realize developments according to actual work and drive control voltage, it is quick, the judgement of accurate water shortage state, because the operating voltage and the actual operating current of atomizing piece are stable, consequently, the testing result error is less, the performance is more reliable and more stable, the product uniformity is good, be convenient for mass production, it is big to have solved operating current or the change of electric capacity among the conventional non-contact detection technique at present, the problem that is difficult to mass production is caused to water shortage detection error and product uniformity difference etc.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A water shortage detection system, comprising:
the first end of the switch control circuit is connected with a power supply, and the second input end of the switch control circuit is grounded and used for receiving the power supply voltage and generating a driving control voltage according to the power supply voltage;
the first input end of the atomization driving circuit is connected with the power supply, and the second input end of the atomization driving circuit is electrically connected with the first output end of the switch control circuit and is used for receiving the power supply voltage and the drive control voltage and maintaining the working current of the atomization sheet according to the power supply voltage and the drive control voltage;
a first input end of the feedback circuit is electrically connected with a second output end of the switch control circuit, a second input end of the feedback circuit is electrically connected with an output end of the atomization driving circuit, and the feedback circuit is used for detecting the driving control voltage and the working current of the atomization piece, generating the actual working voltage of the atomization driving circuit according to the working current of the atomization piece, and outputting the actual working voltage and the actual working current respectively; and
the first input end of the master control circuit is electrically connected with the first output end of the feedback circuit, the second input end of the master control circuit is electrically connected with the second output end of the feedback circuit, the first output end of the master control circuit is electrically connected with the third input end of the switch control circuit and is used for receiving the driving control voltage output by the first output end of the feedback circuit and the actual working voltage of the atomization driving circuit output by the second output end of the feedback circuit and providing the actual working voltage of the atomization driving circuit with a switch control signal, so that the switch control circuit adjusts the size of the driving control voltage according to the switch control signal.
2. The water shortage detection system of claim 1 wherein the switch control circuit comprises:
a first input end of the switch branch circuit is electrically connected with the power supply, a second input end of the switch branch circuit is grounded, and a third end input end of the switch branch circuit is electrically connected with a first output end of the main control circuit and is used for providing the power supply voltage according to a switch control signal; and
the generation branch circuit comprises a generation branch circuit, a first input end of the generation branch circuit and an output end of a switch branch circuit are electrically connected, a second input end of the generation branch circuit is grounded, a first output end of the generation branch circuit is electrically connected with a second input end of the atomization driving circuit, a second output end of the generation branch circuit is electrically connected with a first input end of the feedback circuit and used for receiving the power supply voltage, and the driving control voltage is generated according to the power supply voltage.
3. The water shortage detection system of claim 2 wherein the feedback circuit comprises:
the input end of the first feedback branch circuit is electrically connected with the second output end of the generating branch circuit, the second input end of the first feedback branch circuit is grounded, and the output end of the first feedback branch circuit is electrically connected with the first input end of the main control circuit and is used for detecting and outputting the driving control voltage; and
the first input end of the second feedback branch circuit is electrically connected with the output end of the atomization driving circuit, the second input end of the second feedback branch circuit is grounded, the output end of the second feedback branch circuit is electrically connected with the second input end of the main control circuit and used for detecting the working current in the atomization driving circuit and generating the actual working voltage of the atomization driving circuit according to the working current of the atomization piece.
4. The water deficit detection system of claim 3, wherein the switching leg includes:
the source electrode of the switching tube Q1 is connected with the power supply, and the drain electrode of the switching tube Q1 is electrically connected with the first input end of the generating branch circuit;
a resistor R1, having a first end electrically connected to the power supply and the source of the switch, and a second end electrically connected to the gate of the switch transistor Q1;
a resistor R2, a first end of which is electrically connected with the grid of the switch tube Q1 and a second end of the resistor R1;
a resistor R3, a first end of which is electrically connected with the second end of the resistor R2;
the drain electrode of the switching tube Q2 is electrically connected with the second end of the resistor R3, and the source electrode of the switching tube Q2 is grounded;
a resistor R4, the first end of which is electrically connected with the grid of the switch tube Q2, and the second end of which is grounded; and
and a first end of the resistor R5 is electrically connected with the first end of the resistor R4 and the gate of the switching tube Q2, and a second end of the resistor R5 is electrically connected with the first output end of the main control circuit.
5. The water deficit detection system according to claim 4, wherein the generating branch includes:
a resistor R6, the first end of which is electrically connected with the drain electrode of the switch tube Q1;
a resistor R7, wherein the first end is electrically connected with the second end of the resistor R6, and the second end is grounded;
a capacitor C1, a first end of which is electrically connected with the first end of the resistor R7 and the second end of the resistor R6, and the second end of which is grounded;
a resistor R8, a first end of which is electrically connected to the first end of the capacitor C1, the first end of the resistor R7 and the second end of the resistor R6 respectively;
a resistor R9, a first end of which is electrically connected with the second end of the resistor R8;
the resistor R10 is connected in parallel with two ends of the resistor R8; and
and a first end of the inductor L1 is electrically connected with a second end of the resistor R9, and a second end of the inductor L1 is electrically connected with a second input end of the atomization driving circuit.
6. The water shortage detection system of claim 5 wherein the fogging drive circuit comprises:
a capacitor C3, a first end of which is connected with the power supply;
a resistor R11, a first terminal of which is electrically connected to the second terminal of the capacitor C3, and a second terminal of which is electrically connected to the second terminal of the inductor L1;
a resistor R12 connected in parallel to two ends of the resistor R11, a first end of the resistor R12 is electrically connected to the second end of the capacitor C3 and the first end of the resistor R11, and a second end of the resistor R8938 is electrically connected to the second end of the inductor L1 and the second end of the resistor R11;
a capacitor C4, a first end of which is electrically connected to the second end of the inductor L1, the second end of the resistor R11 and the second end of the resistor R12, respectively, and a second end of which is connected to the atomizing sheet;
a capacitor C5, a first terminal of which is electrically connected to the first terminal of the capacitor C4, the second terminal of the inductor L1, the second terminal of the resistor R11 and the second terminal of the resistor R12, respectively;
a switch Q3 having a drain electrically connected to the power supply and the first end of the capacitor C3, and a gate electrically connected to the second end of the capacitor C3, the first end of the resistor R11, and the first end of the resistor R12, respectively;
an inductor L2, a first end of which is electrically connected to the source of the switching transistor Q3, and a second end of which is electrically connected to the first input end of the second feedback branch and the second end of the capacitor C5; and
a capacitor C6, a first end of which is electrically connected to the power supply, the drain of the switch Q3, and a first end of the capacitor C3, respectively, and a second end of which is electrically connected to the second end of the inductor L2, the capacitor C5, and the first input end of the second feedback branch.
7. The water shortage detection system of claim 6 wherein the first feedback circuit comprises:
a resistor R13, a first end of which is electrically connected with the second end of the resistor R8, the second end of the resistor R10 and the first end of the resistor R9 respectively; and
a capacitor C7, wherein the first end is electrically connected with the second end of the resistor R13, and the second end is grounded;
the second feedback circuit includes:
an inductor L3, a first terminal of which is electrically connected to the second terminal of the inductor L2, the second terminal of the capacitor C5 and the second terminal of the capacitor C6, respectively;
the first end of the resistor R14 is electrically connected with the second end of the inductor L3, and the second end of the resistor R14 is grounded;
a resistor R15, a first terminal of which is electrically connected to the first terminal of the resistor R14 and the second terminal of the inductor L3;
a resistor R16, a first end of which is electrically connected with the second end of the resistor R15, and a second end of which is electrically connected with the second input end of the main control circuit;
a capacitor C8, a first end of which is electrically connected with the second end of the resistor R15 and the first end of the resistor R16, and a second end of which is grounded; and
and a first end of the capacitor C9 is electrically connected with the second input end of the main control circuit and the second end of the resistor R16, and the second end is grounded.
8. The water shortage detection system of claim 7 wherein the master control circuit comprises a microprocessor, a first input of the microprocessor being electrically connected to a first terminal of the resistor R13 and a first terminal of a capacitor C7, a second input of the microprocessor being electrically connected to a first terminal of the capacitor C9 and a second terminal of the resistor R16, a first output of the microprocessor being electrically connected to a second terminal of the resistor R5.
9. The water shortage detection system of claim 1, further comprising a wind control circuit, a first input terminal of the wind control circuit being connected to the power supply, a second input terminal of the wind control circuit being electrically connected to a second input terminal of a main control circuit, an input terminal of the wind control circuit being connected to a fan for receiving the power supply voltage and a wind control command provided by the main control circuit and providing the power supply voltage to the fan according to the wind control command, wherein the wind control circuit comprises:
a resistor R17, wherein the first end of the resistor R17 is electrically connected with the second output end of the main control circuit;
a resistor R18, wherein the first end of the resistor R17 is electrically connected with the second end, and the second end is grounded;
a switch tube Q4, the grid electrode of which is electrically connected with the second end of the resistor R17 and the first end of the resistor R18, the drain electrode of which is connected with the fan, and the source electrode of which is grounded; and
and the resistor R19 has a first end connected with the power supply and a second end electrically connected with the fan.
10. A nebulizer, characterized in that it comprises a water shortage detection system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921111977.5U CN210832398U (en) | 2019-07-16 | 2019-07-16 | Water shortage detection system and atomizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921111977.5U CN210832398U (en) | 2019-07-16 | 2019-07-16 | Water shortage detection system and atomizer |
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| Publication Number | Publication Date |
|---|---|
| CN210832398U true CN210832398U (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921111977.5U Active CN210832398U (en) | 2019-07-16 | 2019-07-16 | Water shortage detection system and atomizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210832398U (en) |
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2019
- 2019-07-16 CN CN201921111977.5U patent/CN210832398U/en active Active
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