Humidifying skirting line warmer
Through the water level detection mechanism of Hall sensor and float, the problem of dry burning of the atomizer sheet when the water level of the humidified skirting line heater is insufficient is solved, and the safety and stability of the equipment are improved. It is suitable for humidified skirting line heating. Promotion and application of the device.
Patent Information
- Application Number
- CN202420193000.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-01-25
AI Technical Summary
If the atomization function is not stopped when the water volume of the humidified skirting line heater is reduced, it will cause the atomization sheet to burn dryly, which poses a safety hazard.
The Hall sensor is used to cooperate with the float with magnets. By detecting the water level changes in the water tank, the control circuit turns off the atomization function when the water level is low to prevent the atomization sheet from burning dryly. This solution includes Hall water detection circuit, atomizing plate oscillation circuit and flyback switching power supply circuit. The output end of the Hall sensor is connected to the control circuit to realize water level detection and start-stop control of the atomizing plate.
It effectively avoids permanent damage caused by dry burning of atomized sheets, improves the safety of the equipment and circuit stability, reduces implementation costs, and is suitable for humidified skirting board heaters with atomization function.
Smart Images
Figure CN222278704U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a heating device, in particular to a humidifying skirting heater. Background Art
[0002] The humidifying skirting heater is a new type of household heating device. While generating heat and providing heating, it also performs atomization to replenish water to prevent the indoor air from being too dry. After the atomization is turned on, the amount of water in the water tank will gradually decrease until there is no water. If the atomization function is not stopped at this time, the atomizer will dry burn and eventually burn out, posing a safety hazard. Utility Model Content
[0003] In view of the problems mentioned in the background technology, the utility model proposes a humidifying skirting heater, which is specifically implemented by the following technical means:
[0004] The humidifying skirting board heater is provided with a water tank, in which a float and an atomizing sheet are arranged. The electrical part of the humidifying skirting board heater comprises: a control circuit, an atomizing sheet oscillation circuit and a Hall water detection circuit. The atomizing sheet oscillation circuit is connected to the atomizing sheet and is controlled by the control circuit to start / stop self-excited oscillation; the Hall water detection circuit comprises a Hall sensor arranged above the float, and a magnet arranged on the float and floating / sinking with it, and the output end of the Hall sensor is connected to the control circuit.
[0005] As a preferred solution, the control circuit includes a single-chip microcomputer, which is defined with a water level detection pin for connecting to the output end of the Hall sensor, and a start-stop control pin for connecting to the atomizer oscillation circuit, and the start-stop control pin is used to output a PWM signal. The Hall sensor is a two-wire Hall sensor or a three-wire Hall sensor. When a two-wire Hall sensor is used, the water level detection pin is the AD pin of the single-chip microcomputer, and when a three-wire Hall sensor is used, the water level detection pin is the I / O pin of the single-chip microcomputer.
[0006] As a preferred solution, the atomizer sheet oscillation circuit includes an atomizer sheet terminal, a first optocoupler unit, a first inductor, a second inductor, a first transistor, a first diode, a second diode, a first capacitor and a second capacitor; the input side of the first optocoupler unit is connected to a single-chip microcomputer to obtain a PWM signal, the fourth pin of its output side is connected to a DC source via a first diode, and the third pin of its output side is connected to the base of a first transistor via a first inductor; the collector of the first transistor is connected to a DC source, the emitter of the first transistor is grounded via a second inductor, and a second diode and a first capacitor are connected in parallel between the collector and the emitter; one pin of the atomizer sheet terminal is connected to a DC source, and the other end is connected to the base of the first transistor via a second capacitor.
[0007] As a preferred solution, the atomizer oscillation circuit further includes a plurality of voltage-dividing resistors connected in series between the DC source and the ground terminal, the anode of the first diode is connected to the voltage-dividing resistor, and the cathode thereof is connected to pin 4 of the output side of the first optocoupler unit.
[0008] As a preferred solution, the electrical part also includes: a flyback switching power supply circuit for providing at least two DC voltage outputs. The flyback switching power supply circuit includes a first yoke current module, a rectifier bridge, a second yoke current module, a switch control chip, a transformer coil, a first output module, and a second output module; the first yoke current module, the rectifier bridge, and the second yoke current module are connected in sequence, one end of the first winding on the primary side of the transformer coil is connected to the output end of the second yoke current module, and the other end is connected to the control signal output pin of the switch control chip, the second winding on the primary side of the transformer is connected to the power pin of the switch control chip, one end of the third winding on the secondary side of the transformer is connected to the first output module, and the other end is connected to the second output module, and the middle tap of the third winding is grounded.
[0009] As a preferred solution, the flyback switching power supply circuit further includes a buck stabilizing module, and an input end of the buck stabilizing module is connected to the first output module or the second output module.
[0010] As a preferred solution, the input end of the first yoke current module is provided with a varistor and an adjustable resistor.
[0011] Compared with the prior art, the advantages of the utility model are as follows: the water shortage detection of the water tank is realized by cooperating with the Hall sensor and the float with a magnet, and the atomization function is turned off in time when the water level in the water tank is low, so as to avoid the dry burning of the atomization piece and cause permanent damage. The circuit has good stability, the Hall device is easy to install, and the implementation cost is low, which is conducive to the promotion and implementation of products with atomization function such as humidifying skirting heaters. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 Schematic diagram of the internal structure of the water tank.
[0013] Figure 2 This is the schematic diagram of the atomizer oscillation circuit.
[0014] Figure 3 This is the schematic diagram of the Hall water detection circuit.
[0015] Figure 4 This is the schematic diagram of the flyback switching power supply circuit. DETAILED DESCRIPTION
[0016] Combine the following Figures 1 to 4 , further describe this application scheme:
[0017] See attached Figure 1The humidifying skirting heater is provided with a water tank 1, in which a float 2 and an atomizing sheet are arranged. The electrical part of the humidifying skirting heater includes: a control circuit, an atomizing sheet oscillation circuit and a Hall water detection circuit. The atomizing sheet oscillation circuit is connected to the atomizing sheet, and is controlled by the control circuit to start / stop self-excited oscillation; the Hall water detection circuit includes a Hall sensor arranged above the float 2, and a magnet 3 arranged on the float 2 and floating / sinking with it. The Hall sensor here can be arranged in the external space of the water tank 1 for easy wiring, and of course it can also be arranged in the water tank 1, according to the specific structural requirements. The output end of the Hall sensor is connected to the control circuit. As the water level of the water tank drops, the magnet moves away from the Hall sensor above with the float 2, and then the output voltage of the Hall sensor changes. When the change exceeds the predetermined value, it will trigger the control circuit to shut down the atomizing sheet oscillation circuit, thereby protecting the atomizing sheet.
[0018] See attached Figure 3 The control circuit includes a single-chip microcomputer IC1, which defines a water level detection pin for connecting to the output end of the Hall sensor U4, and a start-stop control pin (pin 21) for connecting to the atomizer oscillation circuit. The start-stop control pin (pin 21) is used to output a PWM signal. The Hall sensor U4 can be a two-wire Hall sensor or a three-wire Hall sensor.
[0019] In this embodiment, a three-wire Hall sensor is used, and resistors R21 and R26 are connected in series between the +5V DC source and the water level detection pin (pin 6). The output pin of the Hall sensor U4 is connected to the resistor R26. Since the three-wire Hall sensor outputs high and low level digital signals, the water level detection pin is selected as the I / O pin (pin 6) of the single-chip microcomputer. The Hall sensor U4 cannot detect the magnetic field of the magnet, and the output pin of the Hall sensor U4 changes from the original low potential to a high impedance state, and then the water level detection pin (pin 6) is pulled up to a high potential by the resistor R21 (resistors R21 and R26 divide the voltage). At this time, the output of the start-stop control pin (pin 21) of the single-chip microcomputer IC1 is low, and the atomizer oscillation circuit stops working.
[0020] Since the two-wire Hall sensor outputs an analog signal, when the two-wire Hall sensor is used, the water level detection pin must be the AD pin of the single-chip microcomputer IC1. When the water level in the water tank drops to the lower limit, the Hall sensor U4 cannot detect the magnetic field of the magnet, and the voltage of the water level detection pin will be pulled down to about 3.6V by the output pin of the Hall sensor U4. At this time, the voltage is lower than the preset value (for example, 3.8V), and the output of the start-stop control pin (pin 21) of the single-chip microcomputer IC1 is low, and the atomizer oscillation circuit stops working.
[0021] See attached Figure 2The atomizer sheet oscillation circuit includes an atomizer sheet terminal CN3, a first optical coupling unit U6, a first inductor L4, a second inductor L5, a first transistor Q2, a first diode D8, a second diode D7, a first capacitor CCE1 and a second capacitor CBC1; the input side of the first optical coupling unit U6 is connected to the start-stop control pin (pin 21) of the single-chip computer IC1 to obtain a PWM signal, the 4th pin of the output side is connected to the +24V DC source via the first diode D8, and the 3rd pin of the output side is connected to the base of the first transistor Q2 via the first inductor L4, and the first optical coupling unit U6 and the second inductor D7 are connected to the first transistor Q2. An inductor L4 constitutes the isolation control part of the atomizer oscillation circuit, controls the oscillation frequency based on the PWM signal, and has a better isolation effect; the collector of the first transistor Q2 is connected to the +24V DC source, and its emitter is grounded through the second inductor L5, and the second diode D7 and the first capacitor CCE1 are connected and connected between its collector and emitter; one pin of the atomizer terminal CN3 is connected to the +24V DC source, and the other end is connected to the base of the first transistor Q2 through the second capacitor CBC1, and a fuse S1 is provided between the emitter of the first transistor Q2 and the second inductor. The atomizer oscillation circuit also includes voltage-dividing resistors R29, R30 and R34 connected in series between the +24V DC source and the ground terminal, the anode of the first diode D8 is connected to the voltage-dividing resistor R30, and its cathode is connected to the 4th pin of the output side of the first optical coupling unit U6.
[0022] See attached Figure 4The electrical part of the humidifying skirting heater also includes: a flyback switching power supply circuit for providing at least two DC voltage outputs, the flyback switching power supply circuit includes a first yoke flow module, a rectifier bridge, a second yoke flow module, a switch control chip U2, a transformer coil T1, a first output module and a second output module; the first yoke flow module includes a yoke flow inductor L1, a filter capacitor CX1 arranged at the output end of the yoke flow inductor L1, and resistors RX1 and RX2; the second yoke flow module includes a yoke flow inductor L2, a filter capacitor EC1 respectively arranged at the input end and the output end of the yoke flow inductor L2 and EC3, as well as resistors RX1 and RX2; the first yoke module, the rectifier bridge and the second yoke module are connected in sequence to provide multiple protections at the input end of the circuit; one end of the first winding on the primary side of the transformer coil is connected to the output end of the second yoke module, and the other end is connected to the control signal output pin of the switch control chip, the second winding on the primary side of the transformer is connected to the power pin of the switch control chip, and the switch control chip and the transformer constitute a flyback transformer unit, one end of the third winding on the secondary side of the transformer is connected to the first output module, and the other end is connected to the second output module, and the middle tap of the third winding is grounded. The first output module includes a diode D1, a resistor R5 connected in parallel to the cathode of the diode D1, filter capacitors EC2 and C3, and capacitor C1 and resistor R1 are connected between the two ends of the diode D1; similarly, the second output module includes a diode D2, a resistor R12 connected in parallel to the cathode of the diode D2, filter capacitors EC6 and C7, and capacitor C4 and resistor R5 are connected between the two ends of the diode D2; the number of turns of the third winding (between pins 8 and 10) is divided by the middle tap (pin 9), so that the first output module outputs a +24V DC voltage and the second output module outputs a +12V DC voltage, wherein the +24V DC voltage is used to power the atomizer oscillation circuit.
[0023] The flyback switching power supply circuit also includes a buck stabilizing module, which includes a buck stabilizing chip U1, filter capacitors EC4 and C5 arranged on the input side of the buck stabilizing chip U1, and an inductor L3, filter capacitors EC5 and C6 arranged on the output side of the buck stabilizing chip U1; the input end of the buck stabilizing module is connected to the first output module or the second output module. In this embodiment, the input end of the buck stabilizing module is connected to the second output module, and the +12V voltage output of the second output module is stepped down to a +5V voltage output to power modules such as the single-chip microcomputer and the Hall sensor.
[0024] The input end of the first yoke current module is provided with a varistor ZR1 and an adjustable resistor TR1. The varistor ZR1 is used for grid surge protection, while the adjustable resistor TR1 can adjust the resistance value according to the input current demand to protect the subsequent circuit.
[0025] The above-mentioned preferred implementation modes should be regarded as illustrative examples of the implementation modes of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on this scheme should be regarded as within the scope of protection of this patent.
Claims
1. A humidifying skirting heater, provided with a water tank, a float and an atomizing sheet are provided in the water tank, characterized in that: The electrical part includes: a control circuit, an atomizer sheet oscillation circuit and a Hall water detection circuit. The atomizer sheet oscillation circuit is connected to the atomizer sheet and is controlled by the control circuit to start / stop self-excited oscillation; the Hall water detection circuit includes a Hall sensor arranged above the float, and a magnet arranged on the float and floating / sinking with it, and the output end of the Hall sensor is connected to the control circuit.
2. The humidifying skirting heater according to claim 1, characterized in that: The control circuit includes a single chip microcomputer, which is defined with a water level detection pin for connecting to the output end of the Hall sensor and a start-stop control pin for connecting to the atomizer oscillation circuit, and the start-stop control pin is used to output a PWM signal.
3. The humidifying skirting heater according to claim 2, characterized in that: The Hall sensor is a two-wire Hall sensor or a three-wire Hall sensor. When a two-wire Hall sensor is used, the water level detection pin is an AD pin of the single-chip microcomputer. When a three-wire Hall sensor is used, the water level detection pin is an I / O pin of the single-chip microcomputer.
4. The humidifying skirting heater according to claim 2, characterized in that: The atomizer sheet oscillation circuit includes an atomizer sheet terminal, a first optocoupler unit, a first inductor, a second inductor, a first transistor, a first diode, a second diode, a first capacitor and a second capacitor; the input side of the first optocoupler unit is connected to a single-chip microcomputer to obtain a PWM signal, the fourth pin of the output side is connected to a DC source via a first diode, and the third pin of the output side is connected to the base of a first transistor via a first inductor; the collector of the first transistor is connected to a DC source, the emitter of the first transistor is grounded via a second inductor, and a second diode and a first capacitor are connected in parallel between the collector and the emitter; one pin of the atomizer sheet terminal is connected to a DC source, and the other end is connected to the base of the first transistor via a second capacitor.
5. The humidifying skirting heater according to claim 4, characterized in that: A fuse is provided between the emitter of the first transistor and the second inductor.
6. The humidifying skirting heater according to claim 4, characterized in that: The atomizer oscillation circuit also includes a plurality of voltage-dividing resistors connected in series between a DC source and a ground terminal. The anode of the first diode is connected to the voltage-dividing resistor, and the cathode thereof is connected to pin 4 of the output side of the first optical coupling unit.
7. The humidifying skirting heater according to claim 1, characterized in that: The electrical part also includes: a flyback switching power supply circuit for providing at least two DC voltage outputs.
8. The humidifying skirting heater according to claim 7, characterized in that: The flyback switching power supply circuit includes a first yoke module, a rectifier bridge, a second yoke module, a switch control chip, a transformer coil, a first output module and a second output module; the first yoke module, the rectifier bridge and the second yoke module are connected in sequence, one end of the first winding on the primary side of the transformer coil is connected to the output end of the second yoke module, and the other end is connected to the control signal output pin of the switch control chip, the second winding on the primary side of the transformer is connected to the power pin of the switch control chip, one end of the third winding on the secondary side of the transformer is connected to the first output module, and the other end is connected to the second output module, and the middle tap of the third winding is grounded.
9. The humidifying skirting heater according to claim 8, characterized in that: The flyback switching power supply circuit further includes a buck stabilizing module, and an input end of the buck stabilizing module is connected to the first output module or the second output module.
10. The humidifying skirting heater according to claim 8, characterized in that: The input end of the first yoke current module is provided with a varistor and an adjustable resistor.