Multi-power thick film heating circuit

Abstract

The utility model discloses a multi-power thick film heating circuit, which comprises a first conductor circuit, a second conductor circuit and a plurality of thick film heating circuits arranged in parallel, the first conductor circuit, the second conductor circuit and the plurality of thick film heating circuits are arranged on a heating substrate, power supply welding spots are further arranged on the heating substrate, and each thick film heating circuit comprises a plurality of heating resistors arranged on the heating substrate. The two ends of each heating resistor in the thick film heating circuit are electrically connected with the power supply welding spot through the first conductor circuit and the second conductor circuit respectively; the heating base body is provided with a temperature control circuit used for feeding back heating working conditions of the multiple parallel thick film heating circuits to the temperature control switch, the multiple parallel thick film heating circuits are electrically connected with the temperature control circuit, the temperature control circuit is powered on for heating when the thick film heating circuits are powered on for heating, and heat of the temperature control circuit is transmitted to the temperature control switch after the temperature control circuit is powered on for heating. According to the utility model, a single temperature control switch can be adopted in a parallel thick film heating circuit to realize multi-section power dry burning prevention protection, and the cost of a thermal assembly is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thick film heating, in particular to a multi-power thick film heating circuit. Background Art

[0002] With the development of economy and the continuous improvement of living standards, traditional electric heating products can no longer meet people's needs. The emergence of thick film circuit heating elements has made electric heating products develop in the direction of low energy consumption, high efficiency and miniaturization, and has produced a variety of new electric heating products. At present, thick film heaters are usually provided with multiple parallel heating resistors, and the heating resistors are connected in parallel through two or more conductor lines to form multiple parallel heating circuits, so that different power segment combinations can be achieved on the same heating element under the total power, voltage and resistance to achieve different heating effects. The dry burning protection of existing thick film heating devices is protected by temperature control switches, and each heating circuit needs to be provided with a temperature control switch. For example, the thick film heating component with a high safety factor disclosed in patent publication number CN214791886U has the problem that parallel thick film heating circuits cannot use a single temperature control switch to prevent multi-stage power dry burning, increase the cost of the heating component, and have a complex structure. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a multi-power thick film heating circuit, which can realize multi-stage power anti-dry burning protection by adopting a single temperature control switch in a parallel thick film heating circuit, reduce the cost of thermal components, and effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-power thick film heating circuit, comprising a first conductor circuit, a second conductor circuit and a plurality of thick film heating circuits arranged in parallel on a heating substrate, a power supply welding point is also provided on the heating substrate, the thick film heating circuit comprises a plurality of heating resistors provided on the heating substrate, and the two ends of each heating resistor in the thick film heating circuit are electrically connected to the power supply welding point through the first conductor circuit and the second conductor circuit respectively; a temperature control switch installation area is provided on the heating substrate, and a temperature control circuit for feeding back the heating conditions of the plurality of parallel thick film heating circuits to the temperature control switch is provided at the temperature control switch installation area, the plurality of parallel thick film heating circuits are all electrically connected to the temperature control circuit, and when the thick film heating circuit is powered on for heating, the temperature control circuit is powered on for heating, and after the temperature control circuit is heated, its heat is transferred to the temperature control switch.

[0005] Furthermore, a first insulating layer is provided on the outer surface of the heating substrate, a protective layer is provided on the outer side of the first insulating layer, and the thick film heating circuit, the first conductor circuit, the second conductor circuit, the power supply solder joint and the temperature control circuit are all arranged on the first insulating layer.

[0006] Furthermore, the temperature control circuit is electrically connected in the second conductor circuit, and the temperature control circuit is electrically connected to a plurality of thick film heating circuits arranged in parallel through the second conductor circuit; the temperature control circuit includes a plurality of temperature control resistors, and the temperature control resistors are electrically connected through conductors.

[0007] Furthermore, the temperature control resistors are connected in series with each other through conductors, and the temperature control circuit is connected in series in the second conductor circuit.

[0008] Furthermore, the square resistance of the temperature-controlled resistor is smaller than the square resistance of the heating resistor.

[0009] Furthermore, the multiple temperature control resistors of the temperature control circuit are arranged in parallel.

[0010] Furthermore, a temperature sensing element is also provided on the first insulating layer, and a detection solder joint electrically connected to the temperature sensing element is provided on the first insulating layer.

[0011] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-power thick film heating circuit, comprising a first conductor circuit, a second conductor circuit and a plurality of thick film heating circuits arranged in parallel on a heating substrate, a power supply welding point is also provided on the heating substrate, the thick film heating circuit comprises a plurality of heating resistors provided on the heating substrate, and the two ends of each heating resistor in the thick film heating circuit are electrically connected to the power supply welding point through the first conductor circuit and the second conductor circuit respectively; a temperature control switch installation area is provided on the heating substrate, and a temperature control circuit for feeding back the heating conditions of the plurality of parallel thick film heating circuits to the temperature control switch is provided at the temperature control switch installation area, the plurality of parallel thick film heating circuits are all electrically connected to the temperature control circuit, and when the thick film heating circuit is powered on for heating, the temperature control circuit is powered on for heating, and after the temperature control circuit is heated, its heat is transferred to the temperature control switch.

[0012] Furthermore, a first insulating layer is provided on the outer surface of the heating substrate, a protective layer is provided on the outer side of the first insulating layer, and the thick film heating circuit, the first conductor circuit, the second conductor circuit, the power supply solder joint and the temperature control circuit are all arranged on the first insulating layer.

[0013] Furthermore, the temperature control circuit is electrically connected in the second conductor circuit, and the temperature control circuit is electrically connected to a plurality of thick film heating circuits arranged in parallel through the second conductor circuit; the temperature control circuit includes a plurality of temperature control resistors, and the temperature control resistors are electrically connected through conductors.

[0014] Furthermore, the temperature-controlled resistors are electrically connected through conductors to form no less than two separate temperature-controlled branch lines, and the second conductor line is provided with conductor branch lines matching the number of the temperature-controlled branch lines. The temperature-controlled branch lines are respectively connected in series in the conductor branch lines corresponding thereto, and one end of each heating resistor is electrically connected to the second conductor line through the conductor branch line.

[0015] Furthermore, the square resistance of the temperature-controlled resistor is smaller than the square resistance of the heating resistor.

[0016] Furthermore, the multiple temperature control resistors of the temperature control circuit are arranged in parallel.

[0017] Furthermore, a temperature sensing element is also provided on the first insulating layer, and a detection solder joint electrically connected to the temperature sensing element is provided on the first insulating layer.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows: the multi-power thick film heating circuit is electrically connected to a plurality of parallel thick film heating circuits through a temperature control circuit provided on the temperature control switch installation area, and the temperature control circuit is used to feedback the heating conditions of the plurality of parallel thick film heating circuits to the temperature control switch, thereby realizing multi-stage power anti-dry burning protection in the parallel thick film heating circuit by adopting a single temperature control switch, thereby reducing the cost of thermal components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model;

[0020] Figure 2 This is a partial enlarged view of the first embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the first embodiment of the utility model;

[0022] Figure 4 This is a schematic structural diagram of the second embodiment of the utility model;

[0023] Figure 5 This is a partial enlarged view of the second embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the second embodiment of the utility model.

[0025] In the figure: 1. heating substrate; 11. first insulating layer; 2. thick film heating circuit; 21. heating resistor; 3. first conductor circuit; 4. second conductor circuit; 41. conductor branch circuit; 5. power supply solder joint; 6. temperature control switch installation area; 7. temperature control circuit; 71. temperature control resistor; 8. detection solder joint; 9. temperature sensing element. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Embodiment 1

[0027] See also Figure 1-3 The utility model provides a technical solution: a multi-power thick film heating circuit, comprising a first conductor line 3, a second conductor line 4 and a plurality of thick film heating lines 2 arranged in parallel on a heating substrate 1, a power supply soldering point 5 is also provided on the heating substrate 1, the thick film heating line 2 comprises a plurality of heating resistors 21 arranged on the heating substrate 1, and the two ends of each heating resistor 21 in the thick film heating line 2 are electrically connected to the power supply soldering point 5 through the first conductor line 3 and the second conductor line 4 respectively; a temperature control switch installation area 6 is provided on the heating substrate 1, and a temperature control circuit 7 for feeding back the heating conditions of the plurality of parallel thick film heating lines 2 to the temperature control switch is provided at the temperature control switch installation area 6;

[0028] The temperature control circuit 7 includes a plurality of temperature control resistors 71 arranged in parallel, the temperature control resistors 71 are connected in series with each other through conductors, and the temperature control circuit 7 is connected in series in the second conductor circuit 4, and the temperature control circuit 7 is electrically connected to a plurality of thick film heating circuits 2 arranged in parallel through the second conductor circuit 4; when the thick film heating circuit 2 is powered on for heating, the temperature control circuit 7 is powered on for heating, and after the temperature control resistors 71 of the temperature control circuit 7 are heated, the heat is transferred to the temperature control switch.

[0029] Working principle:

[0030] An external temperature control switch is installed in the temperature control switch installation area 6, and the temperature control switch is abutted against the temperature control resistor 71. After the power supply welding point 5 is energized, the multiple thick film heating circuits 2 arranged in parallel are energized through the first conductor line 3 and the second conductor line 4, and the heating resistor 21 starts to heat. Since the temperature control circuit 7 is electrically connected to the multiple thick film heating circuits 2 arranged in parallel through the second conductor line 4, when the multiple thick film heating circuits 2 arranged in parallel are energized for heating, the temperature control circuit 7 is energized, and the temperature control resistor 71 heats up. After the temperature control resistor 71 heats up, its heat is transferred to the temperature control switch, so that multi-stage power anti-dry burning protection can be achieved in the parallel thick film heating circuit by using a single temperature control switch, thereby reducing the cost of thermal components.

[0031] Furthermore, a first insulating layer 11 is provided on the outer surface of the heating substrate 1, a protective layer is provided on the outer side of the first insulating layer 11, and the thick film heating circuit 2, the first conductor circuit 3, the second conductor circuit 4, the power supply solder joint 5 and the temperature control circuit 7 are all arranged on the first insulating layer 11; a temperature sensing element 9 is also provided on the first insulating layer 11, and a detection solder joint 8 electrically connected to the temperature sensing element 9 is provided on the first insulating layer 11; the surface temperature of the heating substrate 1 is detected by the temperature sensing element 9.

[0032] Furthermore, the square resistance of the temperature control resistor 71 is smaller than the square resistance of the heating resistor 21 . The small square resistance of the temperature control resistor 71 reduces the power density of the temperature control circuit 7 and reduces the influence of the temperature control circuit 7 on the heating efficiency of the thick film heating circuit 2 . Embodiment 2

[0033] See also Figure 4-6 The utility model also provides a technical solution: a multi-power thick film heating circuit. Compared with the first embodiment, the temperature control resistors 71 are electrically connected through conductors to form no less than two separate temperature control branch lines. The second conductor line 4 is provided with conductor branch lines 41 matching the number of temperature control branch lines. The temperature control branch lines are respectively connected in series in the corresponding conductor branch lines 41, and one end of each heating resistor 21 is electrically connected to the second conductor line 4 through the conductor branch line 41.

[0034] During operation: after the power supply welding point 5 is energized, the multiple thick film heating circuits 2 arranged in parallel are energized through the first conductor line 3, the second conductor line 4 and the conductor branch line 41 on the second conductor line 4, and the heating resistor 21 starts to heat up. Moreover, since multiple separate temperature control branch lines are formed between the temperature control resistors 71 and are respectively connected in series in the corresponding conductor branch lines 41, that is, the temperature control branch lines in the temperature control circuit 7 are electrically connected to the multiple thick film heating circuits 2 arranged in parallel through the conductor branch line 41 provided on the second conductor line 4. When the multiple thick film heating circuits 2 arranged in parallel are energized for heating, the temperature control circuit 7 is energized, and the temperature control resistor 71 heats up. After the temperature control resistor 71 heats up, its heat is transferred to the temperature control switch, so that multi-stage power anti-dry burning protection can be achieved in the parallel thick film heating circuit by adopting a single temperature control switch, thereby reducing the cost of thermal components.

[0035] Compared with the first embodiment, this embodiment discloses another form of the temperature control circuit 7 structure and its electrical connection structure with the second conductor circuit 4 and the thick film heating circuit 2 .

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-power thick film heating circuit, comprising a first conductor circuit, a second conductor circuit and a plurality of thick film heating circuits arranged in parallel on a heating substrate, and a power supply soldering point is also arranged on the heating substrate, characterized in that: The thick film heating circuit includes a plurality of heating resistors provided on a heating substrate, and the two ends of each heating resistor in the thick film heating circuit are electrically connected to a power supply welding point through a first conductor circuit and a second conductor circuit respectively; a temperature control switch installation area is provided on the heating substrate, and a temperature control circuit for feeding back the heating conditions of the plurality of parallel thick film heating circuits to the temperature control switch is provided at the temperature control switch installation area, and the plurality of parallel thick film heating circuits are electrically connected to the temperature control circuit, and when the thick film heating circuit is powered on for heating, the temperature control circuit is powered on for heating, and after the temperature control circuit is heated, its heat is transferred to the temperature control switch.

2. A multi-power thick film heating circuit according to claim 1, characterized in that: A first insulating layer is arranged on the outer surface of the heating substrate, a protective layer is arranged on the outer side of the first insulating layer, and the thick film heating circuit, the first conductor circuit, the second conductor circuit, the power supply solder joint and the temperature control circuit are all arranged on the first insulating layer.

3. A multi-power thick film heating circuit according to claim 1, characterized in that: The temperature control circuit is electrically connected in the second conductor circuit, and the temperature control circuit is electrically connected to a plurality of thick film heating circuits arranged in parallel through the second conductor circuit; the temperature control circuit includes a plurality of temperature control resistors, and the temperature control resistors are electrically connected through conductors.

4. A multi-power thick film heating circuit according to claim 3, characterized in that: The temperature control resistors are connected in series with each other through conductors, and the temperature control circuit is connected in series in the second conductor circuit.

5. The multi-power thick film heating circuit according to claim 3, characterized in that: The multiple temperature-controlled resistors are electrically connected through conductors to form no less than two separate temperature-controlled branch lines. The second conductor line is provided with conductor branch lines matching the number of the temperature-controlled branch lines. The temperature-controlled branch lines are respectively connected in series in the corresponding conductor branch lines, and one end of each heating resistor is electrically connected to the second conductor line through the conductor branch line.

6. The multi-power thick film heating circuit according to claim 3, characterized in that: The square resistance of the temperature control resistor is smaller than the square resistance of the heating resistor.

7. The multi-power thick film heating circuit according to claim 3, characterized in that: The multiple temperature control resistors of the temperature control circuit are arranged in parallel.

8. The multi-power thick film heating circuit according to claim 2, characterized in that: A temperature sensing element is also disposed on the first insulating layer, and a detection soldering point electrically connected to the temperature sensing element is disposed on the first insulating layer.

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