CN220017505U - Driving circuit of portable heating device - Google Patents
Driving circuit of portable heating device Download PDFInfo
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- CN220017505U CN220017505U CN202320334620.3U CN202320334620U CN220017505U CN 220017505 U CN220017505 U CN 220017505U CN 202320334620 U CN202320334620 U CN 202320334620U CN 220017505 U CN220017505 U CN 220017505U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 118
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 230000005856 abnormality Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The embodiment of the utility model provides a driving circuit of a portable heating device. The driving circuit comprises a power supply circuit, a controller and a heating circuit. The driving circuit comprises a power input end and a voltage output end, wherein the power input end is used for receiving a first direct-current voltage, and the power circuit is used for receiving the first direct-current voltage and outputting the first direct-current voltage to the voltage output end in a unidirectional manner; the controller is electrically connected with the voltage output end to receive the first direct current voltage and work, and also comprises a pulse voltage output end for outputting a pulse width driving signal; the heating circuit comprises a heating element and a transistor, one end of the heating element is electrically connected with the power input end to receive the first direct current voltage, the other end of the heating element is grounded through two conduction ends of the transistor, and the control end of the transistor is electrically connected with the pulse voltage output end, so that the heating circuit works under the drive of a pulse width driving signal.
Description
Technical Field
The utility model relates to the technical field of heating devices, in particular to a driving circuit of a portable heating device.
Background
With the improvement of the living standard of people, heating devices such as electric blankets and heaters are more and more important in daily life of people, wherein portable heating devices such as hand warmers and hand warmers are more and more favored by people. However, the design, driving and safety of the driving circuit of the portable heating device are all important issues in the industry. In the related art, some portable heating devices are powered or charged by mains supply, so that the problem of energy storage or inconvenient use exists when the portable heating devices are out of service, the user experience is reduced, and improvement is necessary.
Disclosure of Invention
In view of the above, the present utility model provides a driving circuit of a portable heating device with a high user experience.
The embodiment of the utility model provides a driving circuit of a portable heating device, which comprises: the power supply circuit comprises a power supply input end and a voltage output end, wherein the power supply input end is used for receiving a first direct-current voltage, and the power supply circuit is used for receiving the first direct-current voltage and outputting the first direct-current voltage to the voltage output end in a unidirectional manner; the controller is electrically connected with the voltage output end to receive the first direct current voltage and work, and the controller also comprises a pulse voltage output end for outputting a pulse width driving signal; and the heating circuit comprises a heating element and a transistor, one end of the heating element is electrically connected with the power input end to receive the first direct-current voltage, the other end of the heating element is grounded through two conducting ends of the transistor, and the control end of the transistor is electrically connected with the pulse voltage output end to enable the heating circuit to work under the driving of the pulse width driving signal.
Compared with the related art, in the driving circuit of the portable heating device provided by the embodiment of the utility model, the power supply circuit is used for receiving the first direct-current voltage and outputting the first direct-current voltage to the driving controller in a unidirectional manner, so that the controller outputs a pulse width driving signal to drive the heating circuit to work, the problems of energy storage and inconvenient use caused by charging by using alternating-current mains supply can be avoided, and the user experience is improved. Moreover, the power supply circuit can also prevent the reverse connection of the power supply, and can avoid the phenomenon that the normal work of the heating circuit is influenced due to the overhigh voltage on one side of the controller caused by the abnormality of the heating circuit, so that the use safety of the heating circuit is improved.
In one embodiment, the power supply circuit includes a first diode, a first resistor, and a first capacitor, the power supply input terminal is connected to the voltage output terminal via the first diode and the first resistor, and the first capacitor is connected between the voltage output terminal and ground. It can be appreciated that the power supply circuit has a simple structure, low cost and high reliability.
In one embodiment, the power supply circuit further includes a second capacitor, a third capacitor, and a zener diode, the zener diode being connected between the voltage output terminal and the ground, the second capacitor being connected between one end of the first resistor and the ground, the third capacitor being connected between a node between the first diode and the first resistor and the ground. The power supply circuit with the structure has the advantages of simple structure, stable output signal and higher reliability.
In one embodiment, the heating circuit further includes a second resistor and a third resistor, the second resistor is connected in series between a conducting end of the transistor far from one end of the heating element and ground, one end of the third resistor is grounded, the other end of the third resistor is connected to a control end of the transistor, a node between the transistor and the second resistor is connected to the controller, and the control end of the transistor is electrically connected to the pulse voltage output end to receive the pulse width driving signal. The controller can detect the working state of the heating element through the second resistor, so that the purpose of controlling the working of the heating circuit is achieved.
In one embodiment, the driving circuit further includes a temperature sensing element, a fourth resistor, and a fourth capacitor, one end of the temperature sensing element is connected to the voltage output terminal via the fourth resistor, the other end of the temperature sensing element is grounded, the fourth capacitor is connected between a node between the temperature sensing element and the fourth resistor and ground, one end of the fourth resistor remote from the temperature sensing element is further electrically connected to the controller to receive the first dc voltage, and the node between the fourth resistor and the temperature sensing element is further electrically connected to the controller. Through the temperature sensing element, the controller can detect whether the temperature abnormality exists or not, and control the portable heating device to stop working when the temperature abnormality exists, so that the use safety of the portable heating device is improved.
In one embodiment, the driving circuit further comprises a key electrically connected between the controller and ground. The switch of the portable heating device can be controlled or the heating gear can be adjusted through the keys, so that the use experience of a user is improved.
In one embodiment, the driving circuit further comprises a display screen, the display screen comprises a plurality of input ends, the controller further comprises a plurality of display screen control pins, and the display screen control pins are electrically connected with the output ends to control the display screen to display the temperature and/or the working mode of the portable heating device. Through the display screen, the temperature and/or the working mode of the portable heating device can be displayed, and the user experience of the portable heating device is improved.
In one embodiment, the driving circuit includes a power-on indication branch, one end of the power-on indication branch is connected to the power input end, the other end of the power-on indication branch is grounded, and the power-on indication branch includes a first light emitting diode and a fifth resistor connected in series with the first light emitting diode. Through the startup indication branch, whether the portable heating device is in a working state or not can be conveniently displayed, and the user experience of the portable heating device is improved.
In one embodiment, the driving circuit includes a heating indication branch, one end of the heating indication branch is connected to the power input end, the other end of the heating indication branch is grounded, and the heating indication branch includes a second light emitting diode and a sixth resistor connected in series with the second light emitting diode. Through the heating indication branch, the heating gear of the portable heating device can be conveniently displayed, and the user experience of the portable heating device is improved.
In one embodiment, the driving circuit includes a plurality of parallel shift indication branches, one end of each shift indication branch is connected to the power input end, the other end of each shift indication branch is grounded, and each shift indication branch includes a plurality of third light emitting diodes connected in parallel and a sixth resistor connected between the third light emitting diode and the ground. The display of a plurality of gears is realized through the gear indication branches connected in parallel, and the gear indication device has the advantages of simple structure and high reliability.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a controller of a driving circuit of a portable heating device according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of a power supply circuit of a driving circuit of a portable heating device according to an embodiment of the present utility model;
FIG. 3 is a circuit diagram of a heating circuit of a driving circuit of a portable heating device according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a temperature detection branch of a portable heating device according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a key of a driving circuit of a portable heating device according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a display screen of a driving circuit of a portable heating device according to an embodiment of the present utility model;
fig. 7 is a schematic diagram of a startup indication branch and a heating indication branch of a driving circuit of a portable heating device according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
The terms first, second, third and the like in the description and in the claims of the utility model and in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the term "include" and any variations thereof is intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1-3, an embodiment of the present utility model provides a driving circuit of a portable heating device, which includes a power circuit 20, a controller 10 and a heating circuit 30.
The power supply circuit 20 includes a power supply input terminal 21 and a voltage output terminal 22, the power supply input terminal 21 is configured to receive a first dc voltage, and the power supply circuit 20 is configured to receive the first dc voltage and output the first dc voltage to the voltage output terminal 22 in a unidirectional manner. The first direct current voltage may be 5V, and the power supply circuit may obtain the first direct current voltage through a USB interface or a battery.
The controller 10 is electrically connected to the voltage output terminal 22 to receive the first dc voltage and operate, and the controller 10 further includes a pulse voltage output terminal PWM for outputting a pulse width driving signal.
The heating circuit 30 includes a heating element 31 and a transistor 32, one end of the heating element 31 is electrically connected to the power input terminal 21 to receive the first dc voltage, the other end of the heating element 31 is grounded via two conductive terminals of the transistor 32, and a control terminal of the transistor 32 is electrically connected to the pulse voltage output terminal PWM so that the heating circuit 30 operates under the driving of the pulse width driving signal.
Compared with the related art, in the driving circuit of the portable heating device provided by the embodiment of the utility model, the power circuit 20 is adopted to receive the first direct current voltage, and the first direct current voltage is unidirectionally output and drives the controller, so that the controller 10 outputs a pulse width driving signal to drive the heating circuit 30 to work, the portable heating device can be powered by the USB charging head or the charger, the problems of energy storage and inconvenient use are avoided, and the user experience is improved. In addition, the power supply circuit 20 can prevent reverse connection of power supply, and can prevent the excessive voltage on the side of the controller 10 caused by the abnormality of the heating circuit from affecting the normal operation of the heating circuit, thereby improving the use safety of the heating circuit.
As shown in fig. 2, the power supply circuit 20 includes a first diode 23, a first resistor 24, and a first capacitor 25, the power supply input terminal 21 is connected to the voltage output terminal 22 via the first diode 23 and the first resistor 24, and the first capacitor 25 is connected between the voltage output terminal 22 and ground. It will be appreciated that the power supply circuit 20 is simple in structure, low in cost and high in reliability. The first resistor 24 may be a resistor or a fuse with a smaller resistance, and may play a role in protecting against the safety risk of a motherboard firing when the circuit at the rear end of the power circuit 20 (such as the circuit at the voltage output end 22) is shorted.
As shown in fig. 2, the power circuit 20 further includes a second capacitor 26, a third capacitor 27, and a zener diode 28, the zener diode 28 is connected between the voltage output terminal 22 and the ground, the second capacitor 26 is connected between one end of the first resistor 24 and the ground, and the third capacitor 27 is connected between a node between the first diode 23 and the first resistor 24 and the ground. The power supply circuit 20 having the above structure is simple in structure, stable in output signal, and high in reliability. The zener diode 28 prevents the circuit at the front end of the power circuit 20 (such as the circuit at the side of the power input end 21) from having an instantaneous high voltage, which causes burning out of components such as chips in the circuit at the back end of the power circuit 20, thereby protecting the components in the back end circuit.
As shown in fig. 3, the heating circuit 30 further includes a second resistor 33 and a third resistor 34, the second resistor 33 is connected in series between the conducting end of the transistor 32 far from the end of the heating element 31 and the ground, one end of the third resistor 34 is grounded, the other end is connected to the control end of the transistor 32, the node between the transistor 32 and the second resistor 33 is connected to the controller 10, and the control end of the transistor 32 is electrically connected to the pulse voltage output terminal PWM to receive the pulse width driving signal. The controller 10 can detect the working state of the heating element 31 through the second resistor 33, so as to achieve the purpose of controlling the working of the heating circuit 30. Specifically, if the current of the heating element 31 is large or the heating element 31 is not connected, the controller 10 can learn the above situation by detecting the signal of the node between the transistor 32 and the second resistor 33, so that the operation state of the heating circuit 30 can be controlled, such as protecting the heating element 31.
As shown in fig. 4, the driving circuit further includes a temperature detection branch 40, where the temperature detection branch 40 includes a temperature sensing element 41, a fourth resistor 42, and a fourth capacitor 43, one end of the temperature sensing element 41 is connected to the voltage output terminal 22 via the fourth resistor 42, the other end of the temperature sensing element 41 is grounded, the fourth capacitor 43 is connected between a node between the temperature sensing element 41 and the fourth resistor 42 and ground, one end of the fourth resistor 42, which is far from the temperature sensing element 41, is further electrically connected to the controller 10 to receive the first dc voltage, and a node between the fourth resistor 42 and the temperature sensing element 41 is further electrically connected to the controller 10. By the temperature sensor 41, the controller 10 can detect whether there is a temperature abnormality, and control the portable heating device to stop working when the temperature is abnormal, so as to improve the use safety of the portable heating device.
As shown in fig. 5, the driving circuit further includes a key 50, and the key 50 is electrically connected between the controller 10 and the ground. The switch of the portable heating device can be controlled or the heating gear can be adjusted through the keys, so that the use experience of a user is improved.
As shown in fig. 6, the driving circuit further includes a display screen 60, the display screen 60 includes a plurality of input terminals 61, and the controller 10 further includes a plurality of display screen control pins, and the plurality of display screen control pins are electrically connected to the plurality of input terminals 61, respectively, so as to control the display screen 60 to display the temperature and/or the operation mode of the portable heating device. The temperature and/or the working mode of the portable heating device can be displayed through the display screen 60, so that the user experience of the portable heating device is improved.
As shown in fig. 7, the driving circuit includes a power-on indication branch 71, one end of the power-on indication branch 71 is connected to the power input terminal 21, the other end of the power-on indication branch 71 is grounded, and the power-on indication branch 71 includes a first light emitting diode 711 and a fifth resistor 712 connected in series with the first light emitting diode 711. By the power-on indication branch 71, whether the portable heating device is in a working state or not can be conveniently displayed, and the user experience of the portable heating device is improved.
As shown in fig. 7, the driving circuit includes a heating indication branch 72, one end of the heating indication branch 72 is connected to the power input terminal 21, the other end of the heating indication branch 72 is grounded, and the heating indication branch 72 includes a second light emitting diode 721 and a sixth resistor 722 connected in series with the second light emitting diode 721. Through the heating indication branch 72, the heating gear of the portable heating device can be conveniently displayed, and the user experience of the portable heating device is improved.
As shown in fig. 7, the driving circuit includes a plurality of parallel shift indication branches 73, one ends of the shift indication branches 73 are connected to the power input terminal 21, the other ends of the shift indication branches 73 are grounded, the shift indication branches 73 include a plurality of parallel third light emitting diodes 731 and a sixth resistor 732, and the sixth resistor 732 is connected between the third light emitting diodes 731 and the ground. The display of a plurality of gears is realized through the plurality of gear indication branches 73 which are connected in parallel, and the gear indication device has the advantages of simple structure and high reliability.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. A drive circuit of a portable heating device, characterized in that: the driving circuit includes:
the power supply circuit comprises a power supply input end and a voltage output end, wherein the power supply input end is used for receiving a first direct-current voltage, and the power supply circuit is used for receiving the first direct-current voltage and outputting the first direct-current voltage to the voltage output end in a unidirectional manner;
the controller is electrically connected with the voltage output end to receive the first direct current voltage and work, and the controller also comprises a pulse voltage output end for outputting a pulse width driving signal; and
the heating circuit comprises a heating element and a transistor, one end of the heating element is electrically connected with the power input end to receive the first direct-current voltage, the other end of the heating element is grounded through two conducting ends of the transistor, and the control end of the transistor is electrically connected with the pulse voltage output end to enable the heating circuit to work under the driving of the pulse width driving signal.
2. The portable heating apparatus drive circuit of claim 1, wherein: the power supply circuit comprises a first diode, a first resistor and a first capacitor, wherein the power supply input end is connected to the voltage output end through the first diode and the first resistor, and the first capacitor is connected between the voltage output end and the ground.
3. The portable heating apparatus drive circuit of claim 2, wherein: the driving circuit further comprises a second capacitor, a third capacitor and a voltage stabilizing diode, wherein the voltage stabilizing diode is connected between the voltage output end and the ground, the second capacitor is connected between one end of the first resistor and the ground, and the third capacitor is connected between a node between the first diode and the first resistor and the ground.
4. The portable heating apparatus drive circuit of claim 1, wherein: the heating circuit further comprises a second resistor and a third resistor, wherein the second resistor is connected in series between the conducting end of the transistor far away from one end of the heating element and the ground, one end of the third resistor is grounded, the other end of the third resistor is connected with the control end of the transistor, a node between the transistor and the second resistor is connected to the controller, and the control end of the transistor is electrically connected to the pulse voltage output end to receive the pulse width driving signal.
5. The portable heating apparatus drive circuit of claim 1, wherein: the driving circuit further comprises a temperature detection branch circuit, the temperature detection branch circuit comprises a temperature sensing element, a fourth resistor and a fourth capacitor, one end of the temperature sensing element is connected with the voltage output end through the fourth resistor, the other end of the temperature sensing element is grounded, the fourth capacitor is connected between a node between the temperature sensing element and the fourth resistor and the ground, one end of the fourth resistor, far away from the temperature sensing element, is further electrically connected to the controller so as to receive the first direct-current voltage, and the node between the fourth resistor and the temperature sensing element is further electrically connected to the controller.
6. The portable heating apparatus drive circuit of claim 1, wherein: the driving circuit further comprises a key, and the key is electrically connected between the controller and the ground.
7. The portable heating apparatus drive circuit of claim 1, wherein: the driving circuit further comprises a display screen, the display screen comprises a plurality of input ends, the controller further comprises a plurality of display screen control pins, and the display screen control pins are electrically connected with the output ends so as to control the display screen to display the temperature and/or the working mode of the portable heating device.
8. The portable heating apparatus drive circuit of claim 1, wherein: the driving circuit comprises a start-up indicating branch circuit, one end of the start-up indicating branch circuit is connected to the power input end, the other end of the start-up indicating branch circuit is grounded, and the start-up indicating branch circuit comprises a first light emitting diode and a fifth resistor connected in series with the first light emitting diode.
9. The portable heating apparatus drive circuit of claim 8, wherein: the driving circuit comprises a heating indication branch, one end of the heating indication branch is connected to the power input end, the other end of the heating indication branch is grounded, and the heating indication branch comprises a second light emitting diode and a sixth resistor connected in series with the second light emitting diode.
10. The portable heating apparatus drive circuit of claim 8, wherein: the driving circuit comprises a plurality of gear indication branches connected in parallel, one end of each gear indication branch is connected to the power input end, the other end of each gear indication branch is grounded, each gear indication branch comprises a plurality of third light emitting diodes connected in parallel and a sixth resistor, and the sixth resistor is connected between the third light emitting diodes and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320334620.3U CN220017505U (en) | 2023-02-28 | 2023-02-28 | Driving circuit of portable heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320334620.3U CN220017505U (en) | 2023-02-28 | 2023-02-28 | Driving circuit of portable heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220017505U true CN220017505U (en) | 2023-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320334620.3U Active CN220017505U (en) | 2023-02-28 | 2023-02-28 | Driving circuit of portable heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220017505U (en) |
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2023
- 2023-02-28 CN CN202320334620.3U patent/CN220017505U/en active Active
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