Multi-mode heating hand warmer

Abstract

The utility model relates to a multi-mode heating hand warmer. The multi-mode heating hand warmer comprises a shell, a heating film, a mode switching key, a power supply and a control unit, the control unit comprises a microprocessor and an MOS (Metal Oxide Semiconductor) tube which are arranged in the shell; the microprocessor is provided with a control port and a mode switching detection port, and the grid electrode of the MOS tube is connected with the control port. And the mode switching key is arranged on the shell, and the mode switching key is connected with the mode switching detection port. The heating film and the power supply are arranged in the shell, one end of the power supply is connected with the input end of the heating film, and the output end of the heating film is grounded. And the MOS tube is arranged on a circuit where the power supply is connected with the input end of the heating film, or the MOS tube is arranged on a circuit where the output end of the heating film is grounded. The microprocessor can adjust the heating mode of the hand warmer according to the action of the mode switching key, and then control the power of the heating film by controlling the duty ratio of the PWM pulse signal according to different modes.

Description

Technical Field

[0001] This utility model relates to the field of hand warmers, and more particularly to a multi-mode heating hand warmer. Background Technology

[0002] Hand warmers can be broadly categorized into three types: one heats water (i.e., a hot water bottle); another generates heat through a chemical reaction, producing heat through the contact of internal chemical substances; and the third uses a lithium battery, where an internal heating element heats up when powered, which is the electric hand warmer commonly used in daily life. Existing electric hand warmers typically only control the temperature of the heating film using a thermistor, but cannot control the heating power of the film, meaning they cannot control the overall heating speed of the hand warmer. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] This invention provides a multi-mode heating hand warmer, aiming to solve the problem that existing hand warmers cannot control the heating speed.

[0005] (II) Technical Solution

[0006] To solve the above problems, this utility model provides a multi-mode heating hand warmer, which includes: a shell, a heating film, a mode switching button, a power supply, and a control unit;

[0007] The control unit includes a microprocessor and a MOS transistor, both disposed within the housing; the microprocessor is provided with a control port and a mode switching detection port, and the gate of the MOS transistor is connected to the control port;

[0008] The mode switching button is located on the housing and is connected to the mode switching detection port;

[0009] Both the heating film and the power supply are housed inside the outer casing. One end of the power supply is connected to the input end of the heating film, and the output end of the heating film is grounded.

[0010] The MOS transistor is disposed on the circuit where the power supply is connected to the input terminal of the heating film, or the MOS transistor is disposed on the circuit where the output terminal of the heating film is grounded.

[0011] Preferably, the microprocessor is further provided with a current detection port, which is connected to the input or output terminal of the heating film through a current detection circuit, and the current detection circuit is provided with a detection resistor.

[0012] Preferably, the hand warmer further includes a capacitor, one end of which is connected to the input terminal of the heating film, and the other end of which is grounded.

[0013] Preferably, the MOS transistor is an N-channel MOS transistor, and:

[0014] The drain of the MOSFET is connected to the power supply, and the source of the MOSFET is connected to the input terminal of the heating film; or,

[0015] The drain of the MOS transistor is connected to the output terminal of the heating film, and the source of the MOS transistor is grounded.

[0016] Preferably, a voltage divider resistor is provided on the circuit connecting the control port to the gate of the MOS transistor.

[0017] Preferably, the hand warmer further includes a pull-down resistor, one end of which is grounded and the other end of which is connected to the gate of the MOSFET.

[0018] Preferably, the housing is further provided with a switch trigger button, and the microprocessor is provided with a switch trigger port connected to the switch trigger button.

[0019] Preferably, two heating films are disposed inside the outer casing.

[0020] (III) Beneficial Effects

[0021] This invention places a MOSFET in the circuit connecting the heating film and the power supply. The gate of the MOSFET is connected to a control port on a microprocessor, which can control the MOSFET's on / off state by outputting high / low levels. Since the mode switch button is connected to the microprocessor's switching detection port, the microprocessor can adjust the hand warmer's heating mode based on the button's operation. The microprocessor controls the power of the heating film by adjusting the duty cycle of the PWM pulse signal according to different modes. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal circuit of the hand warmer of this utility model.

[0023] [Explanation of Labels in the Attached Image]

[0024] 1: Heating film; 2: Power supply; 3: Microprocessor; 31: Control port; 311: Voltage divider resistor; 32: Mode switching detection port; 33: Current detection port; 331: Detection circuit; 332: Detection resistor; 34: Switch trigger port; 4: MOSFET; 5: Mode switching button; 6: Capacitor; 7: Pull-down resistor; 8: Switch trigger button. Detailed Implementation

[0025] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] This utility model provides a multi-mode heating hand warmer, including: a shell, a heating film 1, a mode switching button 5, a power supply 2, and a control unit. The control unit includes: a microprocessor 3 and a MOSFET 4, both housed within the shell; the microprocessor 3 has a control port 31 and a mode switching detection port 32, and the gate of the MOSFET 4 is connected to the control port 31. The mode switching button 5 is located on the shell and is connected to the mode switching detection port 32. The heating film 1 and the power supply 2 are both housed within the shell; one end of the power supply 2 is connected to the input terminal of the heating film 1, and the output terminal of the heating film 1 is grounded. The MOSFET 4 is located in the circuit where the power supply 2 is connected to the input terminal of the heating film 1, or in the circuit where the output terminal of the heating film 1 is grounded.

[0030] In this invention, a heating film 1 is attached to the outer shell, and a MOS transistor 4 is provided on the circuit connecting the heating film 1 and the power supply 2. The gate of the MOS transistor 4 is connected to the control port 31 on the microprocessor 3. When the control port 31 on the microprocessor 3 can output a PWM pulse signal, the PWM pulse signal controls the switching of the drain and source on the MOS transistor 4, thereby controlling the switching of the circuit between the heating film 1 and the power supply 2. The PWM pulse signal is a continuous alternating high and low level signal. When the PWM pulse signal is high, the source and drain of MOSFET 4 are in a conducting state. Since the mode switch button 5 is connected to the switching detection port on the microprocessor 3, the microprocessor 3 can adjust the heating mode of the hand warmer according to the action of the mode switch button 5. For example: when the user turns on the hand warmer, the heating mode is level one by default; when the user double-clicks the mode switch button 5, the heating mode changes from level one to level two; when the user double-clicks the mode switch button 5 again, the heating mode changes from level two to level three; when the user double-clicks the mode switch button 5 again, the heating mode changes from level three to level one (levels one, two, and three have different heating speeds, with level three heating faster). The microprocessor 3 controls the power of the heating film 1 by controlling the duty cycle of the PWM pulse signal according to different modes, thereby controlling the heating speed of the hand warmer. In addition, hand warmers generally have a thermistor. By changing the operating point of the thermistor, the temperature level can be adjusted. For example, if you want the hand warmer to be warmer, you can adjust the potentiometer so that the thermistor only cuts off the current at a higher temperature, and vice versa, so as to save electricity or adjust the temperature.

[0031] In a preferred embodiment, two heating films 1 are disposed inside the outer casing, and a corresponding MOSFET 4 is disposed on the circuit connecting each heating film 1 to the power supply 2. Since the hand warmer is usually held by the user's hand, a high-power heating film 1 can be disposed in the area where the user holds the hand, while a relatively low-power heating film 1 can be disposed in the area where the hand is not frequently held. This ensures both the user experience and the duration of the hand warmer's heating effect.

[0032] Furthermore, the microprocessor 3 is also provided with a current detection port 33, which is connected to the input or output terminal of the heating film 1 through a current detection circuit 331. The current detection circuit 331 is provided with a detection resistor 332. By providing a current detection port 33 on the microprocessor 3, it is possible to detect whether the heating film 1 is working properly.

[0033] Furthermore, the hand warmer also includes a capacitor 6, one end of which is connected to the input terminal of the heating film 1, and the other end of the capacitor (6) is grounded. The capacitor 6 reduces the impact of changes in the output current of the power supply 2 on the heating film 1.

[0034] In a preferred embodiment, MOSFET 4 is an N-channel MOSFET 4, and: the drain of MOSFET 4 is connected to power supply 2, and the source of MOSFET 4 is connected to the input terminal of heating film 1; or, the drain of MOSFET 4 is connected to the output terminal of heating film 1, and the source of MOSFET 4 is grounded. In this application, MOSFET 4 can also be a P-channel MOSFET 4.

[0035] In addition, a voltage divider resistor 311 is provided on the circuit connecting the control port 31 to the gate of the MOSFET 4. The hand warmer also includes a pull-down resistor 7, one end of which is grounded and the other end of which is connected to the gate of the MOSFET 4.

[0036] Finally, a switch trigger button 8 is also provided on the outer casing, and a switch trigger port 34 connected to the switch trigger button 8 is provided on the microprocessor 3. When the heating film 1 is disconnected from the power supply 2, after the microprocessor 3 detects that the switch trigger button 8 has been pressed, the microprocessor 3 outputs a PWM pulse signal at the control port 31, and the hand warmer heats up at the default setting. When the heating film 1 is connected to the power supply 2, after the microprocessor 3 detects that the switch trigger button 8 has been pressed, the microprocessor 3 stops outputting signals at the control port 31, and the heating film 1 is disconnected from the power supply 2. The switch trigger button 8 on the outer casing makes it convenient for users to control whether the heating film 1 is heating up.

[0037] It should be understood that the above description of the specific embodiments of this utility model is only for illustrating the technical route and features of this utility model, and its purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. However, this utility model is not limited to the specific embodiments described above. All changes or modifications made within the scope of the claims of this utility model should be covered by the protection scope of this utility model.

Claims

1. A multi-mode heating hand warmer, characterized in that, The hand warmer includes: a shell, a heating film (1), a power supply (2), and a control unit; The control unit includes a microprocessor (3) and a MOS transistor (4) both disposed within the housing; the microprocessor (3) is provided with a control port (31) and a mode switching detection port (32), and the gate of the MOS transistor (4) is connected to the control port (31); The outer casing is provided with a mode switching button (5), and the mode switching button (5) is connected to the mode switching detection port (32); The heating film (1) and the power supply (2) are both located inside the housing. One end of the power supply (2) is connected to the input end of the heating film (1), and the output end of the heating film (1) is grounded. The MOS transistor (4) is disposed on the circuit where the power supply (2) is connected to the input terminal of the heating film (1), or the MOS transistor (4) is disposed on the circuit where the output terminal of the heating film (1) is grounded.

2. The multi-mode heating hand warmer as described in claim 1, characterized in that, The microprocessor (3) is also provided with a current detection port (33), which is connected to the input or output terminal of the heating film (1) through a current detection circuit (331), and the current detection circuit (331) is provided with a detection resistor (332).

3. The multi-mode heating hand warmer as described in claim 1 or 2, characterized in that, The hand warmer also includes a capacitor (6), one end of which is connected to the input terminal of the heating film (1), and the other end of which is grounded.

4. The multi-mode heating hand warmer as described in claim 1 or 2, characterized in that, The MOS transistor (4) is an N-channel MOS transistor, and: The drain of the MOS transistor (4) is connected to the power supply (2), and the source of the MOS transistor (4) is connected to the input terminal of the heating film (1); or, The drain of the MOS transistor (4) is connected to the output terminal of the heating film (1), and the source of the MOS transistor (4) is grounded.

5. The multi-mode heating hand warmer as described in claim 1 or 2, characterized in that, A voltage divider resistor (311) is provided on the circuit connecting the control port (31) to the gate of the MOS transistor (4).

6. The multi-mode heating hand warmer as described in claim 5, characterized in that, The hand warmer also includes a pull-down resistor (7), one end of which is grounded and the other end of which is connected to the gate of the MOS transistor (4).

7. The multi-mode heating hand warmer as described in claim 1 or 2, characterized in that, The outer casing is also provided with a switch trigger button (8), and the microprocessor (3) is provided with a switch trigger port (34) connected to the switch trigger button (8).

8. The multi-mode heating hand warmer as described in claim 1 or 2, characterized in that, The outer casing contains two heating films (1).

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