CN108507103B - Dry combustion method protection circuit, humidifier and air conditioner - Google Patents

Dry combustion method protection circuit, humidifier and air conditioner Download PDF

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Publication number
CN108507103B
CN108507103B CN201810575842.8A CN201810575842A CN108507103B CN 108507103 B CN108507103 B CN 108507103B CN 201810575842 A CN201810575842 A CN 201810575842A CN 108507103 B CN108507103 B CN 108507103B
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China
Prior art keywords
module
resistor
signal
capacitor
oscillation
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CN201810575842.8A
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CN108507103A (en
Inventor
敬仕林
邬祥俊
陈嘉琪
李俊锴
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00—Air-humidification, e.g. cooling by humidification
    • F24F6/12—Air-humidification, e.g. cooling by humidification by forming water dispersions in the air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

The application relates to a dry combustion protection circuit, a humidifier and an air conditioner. When the atomizing piece lacks water, atomizing piece amplitude increases, atomizing oscillation module amplitude increases, correspondingly, the amplitude of oscillation voltage signal that signal detection module detected also increases, when the potential of oscillation voltage signal is higher than the potential of reference voltage signal, voltage comparison module provides the signal of telecommunication to drive control module so that drive control module stops providing drive signal for atomizing oscillation module, get into the protection state fast, prevent atomizing piece dry combustion method damage, and provide the signal of telecommunication to self-locking module, make self-locking module with power voltage signal output for voltage comparison module, form stable closed loop locking, can work again just until power module is cut off, avoid atomizing piece dry combustion method damage.

Description

Dry combustion method protection circuit, humidifier and air conditioner
Technical Field
The application relates to the technical field of electrical equipment, in particular to a dry combustion protection circuit, a humidifier and an air conditioner.
Background
Nowadays, devices having a humidifying function have been widely used, and humidity can be increased for the environment.
At present, an ultrasonic humidifier is widely used and has a humidifying function. The ultrasonic humidifier may release water in the water tank into the air in an atomized manner.
As the ultrasonic humidifier operates, the water in the water tank gradually decreases. In order to remind the user in time to add water, provide the water shortage and detect the function in some ultrasonic humidifier, mainly utilize tongue tube and the float cooperation that takes magnetism to detect, however, after long-time use, tongue tube can be inefficacy, leads to the water shortage to detect inefficacy, and when the water shortage detects inefficacy, after the water in the water tank is whole atomizing, the dry combustion method phenomenon takes place for the empty running of atomizing piece, and atomizing piece temperature rises rapidly, leads to atomizing piece lead wire solder joint to drop, fracture. In the related art, part of the ultrasonic humidifier is provided with a thermal fuse protection, but the temperature of the driving power tube is detected, when the temperature of the driving power tube reaches the thermal fuse protection temperature, the atomizing sheet may be damaged, and the reaction is slower.
Most of the devices with humidifying function in the related art have the problem that the atomizing sheet is easy to damage due to dry burning caused by lack of water.
Disclosure of Invention
In order to overcome the problems in the related art to at least a certain extent, the application provides a dry combustion protection circuit, a humidifier and an air conditioner.
According to a first aspect of an embodiment of the present application, there is provided a dry combustion protection circuit applied to a humidifying device, the humidifying device including a power supply module for providing a power supply voltage signal and an atomizing oscillation module for generating oscillation to drive an atomizing sheet; the dry-fire protection circuit includes: the device comprises a signal detection module, a voltage comparison module, a self-locking module and a driving control module; wherein:
the first end of the signal detection module is connected with the first end of the atomization oscillation module, and the second end of the signal detection module is connected with the first end of the voltage comparison module and is used for detecting an oscillation voltage signal of the atomization oscillation module and providing the oscillation voltage signal to the voltage comparison module;
the second end of the voltage comparison module is used for receiving a reference voltage signal, the third end of the voltage comparison module is connected with the first end of the drive control module, the fourth end of the voltage comparison module is connected with the first end of the self-locking module and is used for comparing the potential of the oscillating voltage signal with the potential of the reference voltage signal, and when the potential of the oscillating voltage signal is higher than the potential of the reference voltage signal, a first potential signal is provided for the drive control module and a second potential signal is provided for the self-locking module;
the second end of the driving control module is connected with the second end of the atomizing oscillation module and is used for stopping providing a driving signal for the atomizing oscillation module under the control of the first potential signal;
the second end of the self-locking module is connected with the first end of the voltage comparison module, the third end of the self-locking module is connected with the first end of the power module, and the self-locking module is used for outputting the power voltage signal to the first end of the voltage comparison module under the control of the second potential signal, and the potential of the power voltage signal is higher than that of the reference voltage signal.
Optionally, the voltage comparing module is further configured to control the voltage comparing module to disconnect from the driving control module and provide a third potential signal to the self-locking module when the potential of the oscillating voltage signal is lower than the potential of the reference voltage signal;
the drive control module is further used for providing a drive signal for the atomization oscillation module to enable the atomization oscillation module to work when the voltage comparison module is disconnected from the drive control module;
the self-locking module is also used for stopping working under the control of the third potential signal.
Optionally, the voltage comparison module includes a first comparator, a first diode and a first resistor; wherein:
the positive phase input end of the first comparator is used for receiving the reference voltage signal, the negative phase input end of the first comparator is respectively connected with the second end of the self-locking module and the first end of the first resistor, and the output end of the first comparator is connected with the negative electrode of the first diode;
the negative electrode of the first diode is also connected with the first end of the self-locking circuit, and the positive electrode of the first diode is connected with the first end of the driving control module;
the second end of the first resistor is connected with the second end of the signal detection module.
Optionally, the voltage comparison module includes a second comparator, a second diode, a second resistor, a third resistor, a fourth resistor and a first NPN triode; wherein:
the negative phase input end of the second comparator is used for receiving the reference voltage signal, the positive phase input end of the second comparator is respectively connected with the second end of the self-locking module and the first end of the second resistor, and the output end of the second comparator is connected with the first end of the third resistor;
the second end of the second resistor is connected with the second end of the signal detection module;
the base electrode of the first NPN triode is respectively connected with the second end of the third resistor and the first end of the fourth resistor, the collector electrode of the first NPN triode is connected with the negative electrode of the second diode, and the emitter electrode of the first NPN triode is grounded;
the negative electrode of the second diode is also connected with the first end of the self-locking module, and the positive electrode of the second diode is connected with the first end of the driving control module;
the second end of the fourth resistor is grounded.
Optionally, the self-locking module includes a switching transistor, a fifth resistor and a sixth resistor; wherein:
the grid electrode of the switching transistor is connected with the first end of the fifth resistor and the first end of the sixth resistor, the source electrode of the switching transistor is connected with the first end of the power supply module, and the drain electrode of the switching transistor is connected with the first end of the voltage comparison module;
the second end of the fifth resistor is connected with the fourth end of the voltage comparison module;
the second end of the sixth resistor is connected with the first end of the power module.
Optionally, the switching transistor is a PNP transistor or an N-type MOS transistor.
Optionally, the device further comprises a reference voltage module;
the first end of the reference voltage module is connected with the first end of the power module, and the second end of the reference voltage module is connected with the second end of the voltage comparison module.
Optionally, the reference voltage module includes a seventh resistor and an eighth resistor; wherein:
the first end of the seventh resistor is connected with the first end of the power supply module, and the second end of the seventh resistor is connected with the second end of the voltage comparison module and the first end of the eighth resistor respectively;
the second end of the eighth resistor is grounded.
Optionally, the third end of the driving control module is further connected with the first end of the power module;
the driving control module comprises an adjustable resistor, a second NPN triode, a first capacitor, a second capacitor, a first inductor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor; wherein:
the base electrode of the second NPN triode is respectively connected with the first end of the ninth resistor and the first end of the first capacitor, the collector electrode of the second NPN triode is connected with the first end of the tenth resistor, and the emitter electrode of the second NPN triode is respectively connected with the first end of the eleventh resistor, the first end of the second capacitor and the first end of the twelfth resistor;
the second end of the twelfth resistor is connected with the first end of the first inductor;
the second end of the first inductor is connected with the second end of the atomizing oscillation module;
the second end of the ninth resistor is connected with the third end of the voltage comparison module;
the second end of the tenth resistor is connected with the first end of the power supply module;
a second end of the first capacitor, a second end of the eleventh resistor and a second end of the second capacitor are grounded;
the first end of the adjustable resistor is connected with the first end of the power supply module, and the second end of the adjustable resistor is connected with the first end of the thirteenth resistor;
the second end of the thirteenth resistor is connected with the second end of the ninth resistor and the first end of the fourteenth resistor respectively;
the second end of the fourteenth resistor is grounded.
Optionally, an emitter of the second NPN transistor is connected to the second end of the voltage comparing module.
Optionally, the signal detection module includes a third diode, a fourth diode, a third capacitor, a fourth capacitor, a fifteenth resistor, and a sixteenth resistor; wherein:
the first end of the fifteenth resistor is connected with the first end of the atomizing oscillation module, and the second end of the fifteenth resistor is connected with the first end of the third capacitor;
the second end of the third capacitor is connected with the anode of the third diode and the cathode of the fourth diode respectively;
the negative electrode of the third diode is respectively connected with the first end of the voltage comparison module, the first end of the sixteenth resistor and the first end of the fourth capacitor;
the anode of the fourth diode is grounded;
the second end of the fourth capacitor is grounded;
the second end of the sixteenth resistor is grounded.
According to a second aspect of the present application, there is provided a humidifier comprising: a humidifying device; the humidifying device comprises a power supply module for providing a power supply voltage signal and an atomization oscillating module for generating oscillation to drive the atomization sheet; the humidifying device further comprises a dry combustion protection circuit as recited in any one of the preceding claims.
Optionally, a third end of the atomizing oscillation module is connected with a second end of the power supply module;
the atomizing oscillation module includes: the crystal oscillator, the third NPN triode, the second inductor, the third inductor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the seventeenth resistor; wherein:
the base electrode of the third NPN triode is connected with the first end of the seventeenth resistor and the first end of the fifth capacitor respectively, the collector electrode of the third NPN triode is connected with the second end of the power supply module, and the emitter electrode of the third NPN triode is connected with the first end of the second inductor;
the second end of the seventeenth resistor is respectively connected with the first end of the signal detection module, the second end of the driving control module, the first end of the sixth capacitor and the first end of the seventh capacitor;
the second end of the sixth capacitor is connected with the first end of the crystal oscillator;
the second end of the crystal oscillator is connected with the second end of the power supply module;
the second end of the seventh capacitor is respectively connected with the second end of the second inductor, the first end of the third inductor and the first end of the eighth capacitor;
the second end of the fifth capacitor and the second end of the eighth capacitor are respectively connected with the second end of the power supply module;
the second end of the third inductor is grounded.
According to a third aspect of the present application, there is provided an air conditioner comprising a water tank, an atomizing sheet provided in the water tank, and a humidifying device connected to the atomizing sheet; the humidifying device comprises a power supply module for providing a power supply voltage signal and an atomization oscillating module for generating oscillation to drive the atomization sheet; the humidifying device further comprises a dry combustion protection circuit as recited in any one of the preceding claims.
The technical scheme provided by the embodiment of the application can comprise the following beneficial effects:
the dry combustion protection circuit comprises a signal detection module, a voltage comparison module, a self-locking module and a driving control module; wherein: the signal detection module detects an oscillation voltage signal of the atomization oscillation module and provides the oscillation voltage signal to the voltage comparison module; the voltage comparison module also receives a reference voltage signal, when the atomizing sheet is lack of water, the amplitude of the atomizing sheet is increased, the amplitude of the atomizing oscillation module is increased, correspondingly, the amplitude of the oscillating voltage signal detected by the signal detection module is also increased, when the potential of the oscillating voltage signal is higher than that of the reference voltage signal, the voltage comparison module provides a first potential signal for the drive control module, the drive control module stops providing the drive signal for the atomizing oscillation module under the control of the first potential signal to stop the operation of the atomizing oscillation module, the atomizing sheet is quickly in a protection state to prevent dry burning damage, and provides a second potential signal for the self-locking module, the self-locking module outputs a power supply voltage signal to the voltage comparison module under the control of the second potential signal, and the voltage comparison module always outputs the first potential signal because the potential of the power supply voltage signal is higher than that of the reference voltage signal, so that the atomizing oscillation module stops operating, and always outputs the second potential signal to the self-locking module, so that stable closed loop locking is formed, and the dry burning protection effect is better until the power supply module is powered off to work again, compared with the related technology, the dry burning protection effect is avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a dry-fire protection circuit according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a dry-fire protection circuit according to another embodiment of the present application.
Fig. 3 is a schematic structural diagram of a dry-fire protection circuit according to another embodiment of the present application.
Fig. 4 is a schematic structural diagram of a dry-fire protection circuit according to another embodiment of the present application.
Fig. 5 is a schematic structural diagram of a dry-fire protection circuit according to another embodiment of the present application.
Fig. 6 is a schematic structural diagram of a dry-fire protection circuit according to another embodiment of the present application.
Fig. 7 is a schematic structural diagram of a dry-fire protection circuit according to another embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of dry-fire protection circuits, humidifiers, and air conditioners consistent with aspects of the present application as detailed in the appended claims.
In view of the problems that the above-mentioned apparatuses having a humidifying function are often prone to damage of the atomizing sheet due to dry combustion due to lack of water. Based on this, provide a humidification device's dry-combustion method protection circuit in the correlation technique, when detecting water tank lack of water, atomizing piece dry-combustion method, can send the power of protection signal shutoff atomizing piece to power supply control module to under its not outage's circumstances, just can reset the complete machine again through pressing reset button, under the unclear water tank anhydrous condition of user, repeatedly pressing reset button easily leads to atomizing piece dry-combustion method, detection, protection repetition cycle, still easily leads to atomizing piece damage. Therefore, the application provides a new dry-burning protection circuit, which is described in detail below.
Fig. 1 is a schematic structural diagram of a dry-fire protection circuit according to an embodiment of the present application.
Referring to fig. 1, the dry combustion protection circuit provided in the present embodiment is applied to a humidifying device, and the humidifying device includes a power module 1 for providing a power voltage signal and an atomizing oscillation module 2 for generating oscillation to drive an atomizing sheet; the dry-fire protection circuit includes: the device comprises a signal detection module 3, a voltage comparison module 4, a self-locking module 5 and a driving control module 6; wherein:
the first end of the signal detection module 3 is connected with the first end of the atomization oscillation module 2, and the second end of the signal detection module is connected with the first end of the voltage comparison module 4, and is used for detecting an oscillation voltage signal of the atomization oscillation module 2 and providing the oscillation voltage signal to the voltage comparison module 4;
the second end of the voltage comparison module 4 is used for receiving a reference voltage signal Vref, the third end is connected with the first end of the drive control module 6, the fourth end is connected with the first end of the self-locking module 5, and is used for comparing the potential of the oscillating voltage signal with the potential of the reference voltage signal, and when the potential of the oscillating voltage signal is higher than the potential of the reference voltage signal, the first potential signal is provided for the drive control module 6, and the second potential signal is provided for the self-locking module 5;
the second end of the driving control module 6 is connected with the second end of the atomizing oscillation module 2 and is used for stopping providing a driving signal for the atomizing oscillation module 2 under the control of the first potential signal;
the second end of the self-locking module 5 is connected with the first end of the voltage comparison module 4, the third end is connected with the first end of the power module 1, and the self-locking module is used for outputting a power voltage signal to the first end of the voltage comparison module 4 under the control of a second potential signal, wherein the potential of the power voltage signal is higher than that of the reference voltage signal.
The dry heating protection circuit comprises a signal detection module 3, a voltage comparison module 4, a self-locking module 5 and a driving control module 6; wherein: the signal detection module 3 detects an oscillation voltage signal of the atomization oscillation module 2 and provides the oscillation voltage signal to the voltage comparison module 4; the voltage comparison module 4 also receives a reference voltage signal, when the atomizing sheet is lack of water, the amplitude of the atomizing sheet is increased, the amplitude of the atomizing oscillation module 2 is increased, correspondingly, the amplitude of the oscillating voltage signal detected by the signal detection module 3 is also increased, when the potential of the oscillating voltage signal is higher than the potential of the reference voltage signal, the voltage comparison module 4 provides a first potential signal for the drive control module 6, the drive control module 6 stops providing the drive signal for the atomizing oscillation module 2 under the control of the first potential signal to stop the operation of the atomizing oscillation module 2, the atomizing sheet is quickly in a protection state, dry burning damage is prevented, and a second potential signal is provided for the self-locking module 5, the self-locking module 5 outputs a power voltage signal to the voltage comparison module under the control of the second potential signal, and the voltage comparison module always outputs the first potential signal because the potential of the power voltage signal is higher than the potential of the reference voltage signal, so that the atomizing oscillation module 2 stops operating, and the second potential signal is always output to the self-locking module 5, thereby forming a stable closed loop lock, and preventing the atomizing sheet from dry burning damage.
Correspondingly, when the atomizing sheet has water to normally work, the amplitude is smaller, the potential of the oscillating voltage signal is lower than that of the reference voltage signal, and at the moment, the atomizing oscillating circuit normally works and does not start dry burning protection. Based on this, the voltage comparison module 4 is further configured to control the voltage comparison module 4 to disconnect from the drive control module 6 and provide a third potential signal to the self-locking module 5 when the potential of the oscillating voltage signal is lower than the potential of the reference voltage signal; the driving control module 6 is further configured to provide a driving signal for the atomizing oscillation module 2 to enable the atomizing oscillation module 2 to work when the voltage comparison module 4 is disconnected from the driving control module 6; the self-locking module 5 is also used for stopping working under the control of the third potential signal.
The dry combustion protection circuit is described in detail below with reference to specific embodiments.
In specific implementation, the voltage comparison module 4 has various specific structures. Two of them are listed below.
1. See the specific structure of the voltage comparison module in the dry-fire protection circuit shown in fig. 2. In fig. 2, the voltage comparison module 4 includes a first comparator U1, a first diode D1, and a first resistor R1; wherein:
the positive phase input end of the first comparator U1 is used for receiving a reference voltage signal Vref, the negative phase input end is respectively connected with the second end of the self-locking module 5 and the first end of the first resistor R1, and the output end is connected with the negative electrode of the first diode D1; the cathode of the first diode D1 is also connected with the first end of the self-locking circuit 5, and the anode is connected with the first end of the drive control module 6; the second end of the first resistor R1 is connected to the second end of the signal detection module 3.
In this embodiment, the positive phase input end of the first comparator U1 receives the reference voltage signal Vref, and the negative phase input end receives the oscillation voltage signal of the atomizing oscillation module 2 detected by the signal detection module 3; when the atomizing sheet works with water, the potential of the oscillating voltage signal is lower than that of the reference voltage signal, the output end of the first comparator U1 outputs a high-potential signal, and as the output end of the first comparator U1 is connected with the negative electrode of the first diode D1, the first diode D1 is cut off, the positive electrode of the first diode D1 is connected with the driving control module 6, at the moment, the voltage comparison module 4 is disconnected with the driving control module 6, the driving control module 6 is not influenced by the voltage comparison module 4, the negative electrode of the first diode D1 is connected with the self-locking module 5, and at the moment, the high-potential signal (namely the third potential signal) is provided for the self-locking module 5; when the atomizing sheet is in water shortage, the amplitude of the atomizing sheet is increased, the amplitude of the atomizing oscillation module 2 is increased, the amplitude of the oscillating voltage signal detected by the signal detection module 3 is increased, the amplitude exceeds the potential of the reference voltage signal, the output end of the first comparator U1 outputs a low potential signal, the first diode D1 is conducted, at this time, the driving control module 6 is provided with the low potential signal (i.e. the first potential signal), and the self-locking module 5 is provided with the low potential signal (i.e. the second potential signal).
2. See the specific structure of the voltage comparison module in the dry-fire protection circuit shown in fig. 3. In fig. 3, the voltage comparison module 4 includes a second comparator U2, a second diode D2, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first NPN transistor Q1; wherein:
the negative phase input end of the second comparator U1 is used for receiving a reference voltage signal Vref, the positive phase input end is respectively connected with the second end of the self-locking module 5 and the first end of the second resistor R2, and the output end is connected with the first end of the third resistor R3; the second end of the second resistor R2 is connected with the second end of the signal detection module 3; the base electrode of the first NPN triode Q1 is respectively connected with the second end of the third resistor R3 and the first end of the fourth resistor R4, the collector electrode is connected with the negative electrode of the second diode D2, and the emitter electrode is grounded; the cathode of the second diode D2 is also connected with the first end of the self-locking module 5, and the anode is connected with the first end of the drive control module 6; the second terminal of the fourth resistor R4 is grounded.
In this embodiment, the negative phase input end of the second comparator U2 receives the reference voltage signal Vref, and the positive phase input end receives the oscillation voltage signal of the atomizing oscillation module 2 detected by the signal detection module 3; when the atomizing sheet works with water, the potential of the oscillating voltage signal is lower than that of the reference voltage signal, the output end of the second comparator U2 outputs a low potential signal, and as the output end of the second comparator U2 is connected with the base electrode of the first NPN triode Q1, the first NPN triode Q1 is cut off, and correspondingly, the second diode D2 is cut off, the positive electrode of the second diode D2 is connected with the driving control module 6, at the moment, the voltage comparison module 4 is disconnected with the driving control module 6, the driving control module 6 is not influenced by the voltage comparison module 4, the negative electrode of the second diode D2 is connected with the self-locking module 5, and at the moment, a high potential signal (namely the third potential signal) is provided for the self-locking module 5; when the atomizing sheet is in water shortage operation, the amplitude of the atomizing sheet is increased, the amplitude of the atomizing oscillation module 2 is increased, the amplitude of the oscillation voltage signal detected by the signal detection module 3 is increased along with the amplitude, the amplitude exceeds the potential of the reference voltage signal, the output end of the second comparator U2 outputs a high potential signal, the first NPN triode Q1 is conducted, and the corresponding second diode D2 is conducted, at this time, a low potential signal (i.e. the first potential signal) is provided for the driving control module 6, and a low potential signal (i.e. the second potential signal) is provided for the self-locking module 5.
In the structure of the two voltage comparison modules listed above, only one signal is input to the non-inverting input end and the inverting input end of the comparator, and no superimposed signal exists, so that the response is faster.
In specific implementation, the self-locking module has various specific structures. With continued reference to fig. 2 and 3, fig. 2 and 3 illustrate a specific structure of a self-locking module, the self-locking module 5, including a switching transistor T, a fifth resistor R5, and a sixth resistor R6; wherein:
the grid electrode of the switching transistor T is connected with the first end of the fifth resistor R5 and the first end of the sixth resistor R6, the source electrode of the switching transistor T is connected with the first end Vcc1 of the power module 1, and the drain electrode of the switching transistor T is connected with the first end of the voltage comparison module 4; the second end of the fifth resistor R5 is connected with the fourth end of the voltage comparison module 4; the second terminal of the sixth resistor R6 is connected to the first terminal Vcc1 of the power supply module 1.
Referring to the above related embodiments, when the atomizing sheet has water to work, the voltage comparing module 4 outputs a high potential signal, and accordingly, the gate of the switching transistor T is at a high potential, the switching transistor T is turned off, the self-locking module does not work (i.e. stops working), and the first end of the voltage comparing module 4 is affected by the oscillating voltage signal. When the atomizing sheet works in a water shortage state, the voltage comparison module 4 outputs a low-level signal, and accordingly, the electric potential of the grid electrode of the switching transistor T is pulled down, the switching transistor T is conducted, the power supply voltage signal provided by the power supply module 1 is provided to the first end of the voltage comparison module 4, and at the moment, the voltage comparison module 4 always outputs the low-level signal due to the fact that the electric potential of the power supply voltage signal is higher than that of the reference voltage signal, and therefore closed-loop locking is formed unless the power supply module 1 is powered off.
The switching transistor may be, but not limited to, a PNP transistor or an N-type MOS transistor, as long as the switching transistor can function as a switch. Fig. 2 and 3 are schematic diagrams of PNP transistors.
In particular, the reference voltage signal received by the voltage comparison module 4 may be a set fixed voltage signal.
If the reference voltage signal is a preset fixed voltage signal, optionally, referring to fig. 4 and 5, the dry combustion protection circuit provided in this embodiment further includes a reference voltage module 7; the first end of the reference voltage module 7 is connected to the first end Vcc1 of the power module 1, and the second end is connected to the second end of the voltage comparison module 4.
Specifically, referring to fig. 4 and 5, the reference voltage module 7 includes a seventh resistor R7 and an eighth resistor R8; wherein:
the first end of the seventh resistor R7 is connected with the first end Vcc1 of the power module 1, and the second end is respectively connected with the second end of the voltage comparison module 4 and the first end of the eighth resistor R8; the second terminal of the eighth resistor R8 is grounded.
In fig. 4, the non-inverting input terminal of the first comparator U1 receives the reference voltage signal, and therefore, the second terminal of the seventh resistor R7 is connected to the non-inverting input terminal of the first comparator U1.
In fig. 5, the negative input terminal of the second comparator U2 receives the reference voltage signal, and therefore, the second terminal of the seventh resistor R7 is connected to the negative input terminal of the second comparator U2.
In this embodiment, the reference voltage signal is generated by dividing the power supply voltage through the seventh resistor R7 and the eighth resistor R8.
In addition to the above-listed reference voltage module configuration, the reference voltage module may be a voltage regulator block, or may be a controllable precision voltage regulator, such as TL431, and the like.
In specific implementation, the specific structure of the driving control module is various. With continued reference to fig. 2 and 3, the third terminal of the drive control module 6 is also connected to the first terminal Vcc1 of the power supply module 1. Specifically, the driving control module 6 includes an adjustable resistor R', a second NPN triode Q2, a first capacitor C1, a second capacitor C2, a first inductor L1, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14; wherein:
the base electrode of the second NPN triode Q2 is respectively connected with the first end of the ninth resistor R9 and the first end of the first capacitor C1, the collector electrode is connected with the first end of the tenth resistor R10, and the emitter electrode is respectively connected with the first end of the eleventh resistor R11, the first end of the second capacitor C2 and the first end of the twelfth resistor R12; the second end of the twelfth resistor R12 is connected with the first end of the first inductor L1; the second end of the first inductor L1 is connected with the second end of the atomizing oscillation module 2; the second end of the ninth resistor R9 is connected with the third end of the voltage comparison module 4; the second end of the tenth resistor R10 is connected with the first end Vcc1 of the power module 1; the second end of the first capacitor C1, the second end of the eleventh resistor R11 and the second end of the second capacitor C2 are grounded; the first end of the adjustable resistor R 'is connected with the first end Vcc1 of the power module 1, and the second end of the adjustable resistor R' is connected with the first end of the thirteenth resistor R13; the second end of the thirteenth resistor R13 is respectively connected with the second end of the ninth resistor R9 and the first end of the fourteenth resistor R14; the second terminal of the fourteenth resistor R14 is grounded.
In this embodiment, the emitter follower formed by the second NPN transistor Q2 in the driving control module 6 provides the driving signal to the atomizing oscillation module. Referring to the above related embodiments, when the atomizing sheet works with water, the voltage comparing module 4 is disconnected from the driving control module 6, the driving control module 6 is not affected, and works normally, when the atomizing sheet works with water being absent, the voltage comparing module 4 outputs a low level signal, the potential of the base electrode of the second NPN transistor Q2 is pulled down, the driving signal is cut off, and the atomizing oscillating module stops working, thereby preventing the atomizing sheet from dry burning.
The adjustable resistor R' can change the potential of the base electrode of the second NPN triode Q2, and then change the potential of the driving signal, so that the oscillation amplitude of the atomizing oscillation module is changed, and the mist quantity is regulated.
The reference voltage signal may be a driving signal extracted from the driving control module.
If the reference voltage signal received by the voltage comparison module 4 is a driving signal extracted from the driving control module, optionally, referring to fig. 6 and 7, the emitter of the second NPN transistor Q2 is connected to the second terminal of the voltage comparison module 4.
In fig. 6, the non-inverting input terminal of the first comparator U1 receives the reference voltage signal, and therefore, the emitter of the second NPN transistor Q2 is connected to the non-inverting input terminal of the first comparator U1.
In fig. 7, the negative input terminal of the second comparator U2 receives the reference voltage signal, and therefore, the emitter of the second NPN transistor Q2 is connected to the negative input terminal of the second comparator U2.
Since the voltage (i.e. potential) of the driving signal of the driving control module 6 is related to the amplitude of the atomizing oscillating circuit 2, the voltage of the detected oscillating voltage signal is related to the voltage of the driving signal, the larger the voltage of the driving signal is, the larger the voltage of the detected oscillating potential signal is, the smaller the voltage of the driving signal is, and the smaller the voltage of the detected oscillating voltage signal is, so that the difference between the detected oscillating voltage signal and the reference voltage signal changes along with the fog level during normal operation, and the larger the difference is when water shortage occurs, the longer the detected oscillating voltage signal reaches the reference voltage signal, the longer the comparator needs to enter protection. In this embodiment, when the mist level is increased by using the driving signal in the driving control module as the reference voltage signal, the voltage of the driving signal is increased, and the voltage of the reference voltage signal is increased, and the voltage of the oscillating voltage signal detected by the signal detection module is correspondingly increased, so that during normal operation, the difference between the reference voltage signal and the detected oscillating voltage signal is the same or similar when different mist levels are used, and protection can be timely performed when water shortage occurs, so that the time difference is reduced.
In specific implementation, the specific structure of the signal detection module is various. With continued reference to fig. 2 and 3, the signal detection module 3 includes a third diode D3, a fourth diode D4, a third capacitor C3, a fourth capacitor C4, a fifteenth resistor R15, and a sixteenth resistor R16; wherein:
the first end of the fifteenth resistor R15 is connected with the first end of the atomizing oscillation module 2, and the second end of the fifteenth resistor R is connected with the first end of the third capacitor C3; the second end of the third capacitor C3 is respectively connected with the anode of the third diode D3 and the cathode of the fourth diode D4; the cathode of the third diode D3 is respectively connected with the first end of the voltage comparison module 4, the first end of the sixteenth resistor R16 and the first end of the fourth capacitor C4; the anode of the fourth diode D4 is grounded; the second end of the fourth capacitor C4 is grounded; the second terminal of the sixteenth resistor R16 is grounded.
In this embodiment, the signal detection module may convert the high-frequency ac signal of the atomizing oscillation module into the low-voltage dc signal, specifically, the high-frequency ac signal is rectified by the third diode D3 and the fourth diode D4 after being step-down coupled by the fifteenth resistor R15 and the third capacitor C3, and then filtered by the sixteenth resistor R16 and the fourth capacitor C4, so as to form a stable low-voltage dc signal. When the atomizing sheet works in a water shortage mode, the amplitude is increased, the amplitude of the atomizing oscillating circuit is increased, and correspondingly, the amplitude of the converted low-voltage direct current signal is also increased.
One embodiment of the present application also provides a humidifier, including: a humidifying device; the humidifying device comprises a power supply module for providing a power supply voltage signal and an atomization oscillating module for generating oscillation to drive the atomization sheet; the humidifying device further comprises a dry combustion protection circuit according to any of the embodiments above. In this embodiment, the dry combustion protection circuit has similar advantages due to the adoption of the dry combustion protection circuit, and the details are not repeated here.
The specific structure of the atomizing oscillation module is various. Alternatively, referring to fig. 2 to 7, the third terminal of the atomizing oscillation module 2 is connected to the second terminal Vcc2 of the power supply module 1. Specifically, the atomizing oscillation module 2 includes: the crystal oscillator Y, the third NPN triode Q3, the second inductor L2, the third inductor L3, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the seventeenth resistor R17; wherein:
the base electrode of the third NPN triode Q3 is connected with the first end of a seventeenth resistor R17 and the first end of a fifth capacitor C5 respectively, the collector electrode is connected with the second end of the power supply module 1, and the emitter electrode is connected with the first end of a second inductor L2; the second end of the seventeenth resistor R17 is respectively connected with the first end of the signal detection module 3, the second end of the drive control module 6, the first end of the sixth capacitor C6 and the first end of the seventh capacitor C7; the second end of the sixth capacitor C6 is connected with the first end of the crystal oscillator Y; the second end of the crystal oscillator Y is connected with the second end of the power module 1; the second end of the seventh capacitor C7 is respectively connected with the second end of the second inductor L2, the first end of the third inductor L3 and the first end of the eighth capacitor C8; the second end of the fifth capacitor C5 and the second end of the eighth capacitor C8 are respectively connected with the second end of the power module 1; the second end of the third inductor L3 is grounded.
The second terminal Vcc2 and the first terminal Vcc1 of the power module 1 may output different power supply voltage signals. Of course, the atomizing oscillation module 2 may be connected to the first end Vcc1 of the power supply module 1, and the same power supply voltage signal as that of the other modules may be used.
One embodiment of the application also provides an air conditioner, which comprises a water tank, an atomization sheet arranged in the water tank, and a humidifying device connected with the atomization sheet; the humidifying device comprises a power supply module for providing a power supply voltage signal and an atomization oscillating module for generating oscillation to drive the atomization sheet; the humidifying device further comprises a dry combustion protection circuit according to any of the embodiments above. In this embodiment, the dry combustion protection circuit has similar advantages due to the adoption of the dry combustion protection circuit, and the details are not repeated here.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (14)

1. The dry heating protection circuit is characterized by being applied to a humidifying device, wherein the humidifying device comprises a power supply module for providing a power supply voltage signal and an atomization oscillation module for generating oscillation to drive an atomization sheet; the dry-fire protection circuit includes: the device comprises a signal detection module, a voltage comparison module, a self-locking module and a driving control module; wherein:
the first end of the signal detection module is connected with the first end of the atomization oscillation module, and the second end of the signal detection module is connected with the first end of the voltage comparison module and is used for detecting an oscillation voltage signal of the atomization oscillation module and providing the oscillation voltage signal to the voltage comparison module;
the second end of the voltage comparison module is used for receiving a reference voltage signal, the third end of the voltage comparison module is connected with the first end of the drive control module, the fourth end of the voltage comparison module is connected with the first end of the self-locking module and is used for comparing the potential of the oscillating voltage signal with the potential of the reference voltage signal, and when the potential of the oscillating voltage signal is higher than the potential of the reference voltage signal, a first potential signal is provided for the drive control module and a second potential signal is provided for the self-locking module;
the second end of the driving control module is connected with the second end of the atomizing oscillation module and is used for stopping providing a driving signal for the atomizing oscillation module under the control of the first potential signal;
the second end of the self-locking module is connected with the first end of the voltage comparison module, the third end of the self-locking module is connected with the first end of the power module, and the self-locking module is used for outputting the power voltage signal to the first end of the voltage comparison module under the control of the second potential signal, and the potential of the power voltage signal is higher than that of the reference voltage signal.
2. The dry-fire protection circuit of claim 1, wherein the voltage comparison module is further configured to control the voltage comparison module to disconnect from the drive control module and provide a third potential signal to the self-locking module when the potential of the oscillating voltage signal is lower than the potential of the reference voltage signal;
the drive control module is further used for providing a drive signal for the atomization oscillation module to enable the atomization oscillation module to work when the voltage comparison module is disconnected from the drive control module;
the self-locking module is also used for stopping working under the control of the third potential signal.
3. The dry-fire protection circuit according to claim 1 or 2, wherein the voltage comparison module comprises a first comparator, a first diode and a first resistor; wherein:
the positive phase input end of the first comparator is used for receiving the reference voltage signal, the negative phase input end of the first comparator is respectively connected with the second end of the self-locking module and the first end of the first resistor, and the output end of the first comparator is connected with the negative electrode of the first diode;
the negative electrode of the first diode is also connected with the first end of the self-locking module, and the positive electrode of the first diode is connected with the first end of the driving control module;
the second end of the first resistor is connected with the second end of the signal detection module.
4. The dry-fire protection circuit according to claim 1 or 2, wherein the voltage comparison module comprises a second comparator, a second diode, a second resistor, a third resistor, a fourth resistor and a first NPN triode; wherein:
the negative phase input end of the second comparator is used for receiving the reference voltage signal, the positive phase input end of the second comparator is respectively connected with the second end of the self-locking module and the first end of the second resistor, and the output end of the second comparator is connected with the first end of the third resistor;
the second end of the second resistor is connected with the second end of the signal detection module;
the base electrode of the first NPN triode is respectively connected with the second end of the third resistor and the first end of the fourth resistor, the collector electrode of the first NPN triode is connected with the negative electrode of the second diode, and the emitter electrode of the first NPN triode is grounded;
the negative electrode of the second diode is also connected with the first end of the self-locking module, and the positive electrode of the second diode is connected with the first end of the driving control module;
the second end of the fourth resistor is grounded.
5. The dry combustion protection circuit of claim 1 or 2, wherein the self-locking module comprises a switching transistor, a fifth resistor and a sixth resistor; wherein:
the grid electrode of the switching transistor is connected with the first end of the fifth resistor and the first end of the sixth resistor, the source electrode of the switching transistor is connected with the first end of the power supply module, and the drain electrode of the switching transistor is connected with the first end of the voltage comparison module;
the second end of the fifth resistor is connected with the fourth end of the voltage comparison module;
the second end of the sixth resistor is connected with the first end of the power module.
6. The dry-fire protection circuit of claim 5, wherein the switching transistor is a PNP transistor or an N-type MOS transistor.
7. The dry heat protection circuit of claim 1 or 2, further comprising a reference voltage module;
the first end of the reference voltage module is connected with the first end of the power module, and the second end of the reference voltage module is connected with the second end of the voltage comparison module.
8. The dry-fire protection circuit of claim 7, wherein the reference voltage module comprises a seventh resistor and an eighth resistor; wherein:
the first end of the seventh resistor is connected with the first end of the power supply module, and the second end of the seventh resistor is connected with the second end of the voltage comparison module and the first end of the eighth resistor respectively;
the second end of the eighth resistor is grounded.
9. The dry heat protection circuit according to claim 1 or 2, wherein the third terminal of the drive control module is further connected to the first terminal of the power module;
the driving control module comprises an adjustable resistor, a second NPN triode, a first capacitor, a second capacitor, a first inductor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor; wherein:
the base electrode of the second NPN triode is respectively connected with the first end of the ninth resistor and the first end of the first capacitor, the collector electrode of the second NPN triode is connected with the first end of the tenth resistor, and the emitter electrode of the second NPN triode is respectively connected with the first end of the eleventh resistor, the first end of the second capacitor and the first end of the twelfth resistor;
the second end of the twelfth resistor is connected with the first end of the first inductor;
the second end of the first inductor is connected with the second end of the atomizing oscillation module;
the second end of the ninth resistor is connected with the third end of the voltage comparison module;
the second end of the tenth resistor is connected with the first end of the power supply module;
a second end of the first capacitor, a second end of the eleventh resistor and a second end of the second capacitor are grounded;
the first end of the adjustable resistor is connected with the first end of the power supply module, and the second end of the adjustable resistor is connected with the first end of the thirteenth resistor;
the second end of the thirteenth resistor is connected with the second end of the ninth resistor and the first end of the fourteenth resistor respectively;
the second end of the fourteenth resistor is grounded.
10. The dry-fire protection circuit of claim 9, wherein an emitter of the second NPN transistor is connected to the first terminal of the voltage comparison module.
11. The dry heat protection circuit according to claim 1 or 2, wherein the signal detection module comprises a third diode, a fourth diode, a third capacitor, a fourth capacitor, a fifteenth resistor, and a sixteenth resistor; wherein:
the first end of the fifteenth resistor is connected with the first end of the atomizing oscillation module, and the second end of the fifteenth resistor is connected with the first end of the third capacitor;
the second end of the third capacitor is connected with the anode of the third diode and the cathode of the fourth diode respectively;
the negative electrode of the third diode is respectively connected with the first end of the voltage comparison module, the first end of the sixteenth resistor and the first end of the fourth capacitor;
the anode of the fourth diode is grounded;
the second end of the fourth capacitor is grounded;
the second end of the sixteenth resistor is grounded.
12. A humidifier, comprising: a humidifying device; the humidifying device comprises a power supply module for providing a power supply voltage signal and an atomization oscillating module for generating oscillation to drive the atomization sheet; the humidifying device further comprises a dry combustion protection circuit according to any one of claims 1 to 11.
13. The humidifier of claim 12, wherein a third end of the atomizing oscillation module is connected to a second end of the power supply module;
the atomizing oscillation module includes: the crystal oscillator, the third NPN triode, the second inductor, the third inductor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the seventeenth resistor; wherein:
the base electrode of the third NPN triode is connected with the first end of the seventeenth resistor and the first end of the fifth capacitor respectively, the collector electrode of the third NPN triode is connected with the second end of the power supply module, and the emitter electrode of the third NPN triode is connected with the first end of the second inductor;
the second end of the seventeenth resistor is respectively connected with the first end of the signal detection module, the second end of the driving control module, the first end of the sixth capacitor and the first end of the seventh capacitor;
the second end of the sixth capacitor is connected with the first end of the crystal oscillator;
the second end of the crystal oscillator is connected with the second end of the power supply module;
the second end of the seventh capacitor is respectively connected with the second end of the second inductor, the first end of the third inductor and the first end of the eighth capacitor;
the second end of the fifth capacitor and the second end of the eighth capacitor are respectively connected with the second end of the power supply module;
the second end of the third inductor is grounded.
14. An air conditioner is characterized by comprising a water tank, an atomization sheet arranged in the water tank and a humidifying device connected with the atomization sheet; the humidifying device comprises a power supply module for providing a power supply voltage signal and an atomization oscillating module for generating oscillation to drive the atomization sheet; the humidifying device further comprises a dry combustion protection circuit according to any one of claims 1 to 11.
CN201810575842.8A 2018-06-05 2018-06-05 Dry combustion method protection circuit, humidifier and air conditioner Active CN108507103B (en)

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CN116273808A (en) * 2023-05-16 2023-06-23 深圳市力生美半导体股份有限公司 Control method, circuit structure, packaging structure, storage medium and transduction system

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