Novel internal and external wire multi-gear heating and safety protection control circuit

Abstract

The utility model belongs to the field of application of heating electric appliances, and particularly relates to a novel internal and external wire multi-gear heating and safety protection control circuit, which comprises a circuit input end with multiple gears and a circuit output end with multiple gears, an inner-layer heating wire and an outer-layer heating wire are respectively connected between the circuit input end and the circuit output end, the inner-layer heating wire is connected with a diode D9 in parallel, and the outer-layer heating wire is connected with a diode D6 in parallel. And when the current is in a limit state, the current value is very large, and the diode forwards inhibits the large current, so that the situation that the safety protection is influenced due to the overlarge current is avoided.

Description

Technical Field

[0001] The utility model belongs to the application field of heating appliances, and in particular relates to a novel internal and external wire multi-stage heating and safety protection control circuit. Background Art

[0002] As a household appliance, the production and sale of electric blankets must comply with relevant safety standards and regulations. These standards and regulations typically set clear safety requirements for electric blankets, including safety protection of the heating wire, electrical insulation performance, and fire resistance. Therefore, safety protection of the internal and external heating wires is a necessary measure to meet these standards and regulations.

[0003] In the prior art, there have been many improvements in the protection technology for internal and external heating wires. For example, the utility model patent entitled "An electric blanket controller that connects internal and external heating wires for heating and realizes overheating protection" and publication number CN221615184U has the following technical solution: an electric blanket controller that connects internal and external heating wires for heating and realizes overheating protection, including a stepped heating system and a circuit safety protection system; the stepped heating system includes an inner heating wire, an outer heating wire and a power supply terminal for point control; the circuit safety protection system includes a first protection structure, a second protection structure, a third protection structure and a fourth protection structure; one end of the inner heating wire is connected in series with the second protection structure through the terminal H1, and the other end of the inner heating wire is connected in series with the fourth protection structure; one end of the outer heating wire is connected to the terminal H2 and is connected in series with the fourth protection structure, and the other end of the outer heating wire is connected in series with the first protection structure through the terminal H3; the utility model provides a thermal fuse FT protection circuit that can be promptly blown when the electric blanket overheats and the PE layer melts and leaks electricity, and the circuit connected to the heating wire is broken.

[0004] The above patent achieves protection by adding a protection diode D7 in the high-speed heating position, but the structure of this protection circuit is too complicated and has only two gears, which cannot provide full protection for the internal and external heating wires in multiple gears. Summary of the Invention

[0005] In response to the above-mentioned problems existing in the prior art, the present application provides a novel multi-stage heating and safety protection control circuit for internal and external wires.

[0006] To achieve the above technical effects, the technical contents of this application are as follows:

[0007] A novel inner and outer wire multi-speed heating and safety protection control circuit includes a circuit input end with multiple speeds and a circuit output end with multiple speeds. The inner heating wire and the outer heating wire are respectively connected between the circuit input end and the circuit output end. The inner heating wire is connected in parallel with a diode D9, and the outer heating wire is connected in parallel with a diode D6.

[0008] Furthermore, the two ends of the inner heating wire are terminal H3 and terminal H4 respectively, the positive pole of the diode D9 is connected to the terminal H4, and the negative pole of the diode D9 is connected to the terminal H3; the two ends of the outer heating wire are terminal H1 and terminal H2 respectively, the positive pole of the diode D6 is connected to the terminal H2, and the negative pole of the diode D6 is connected to the terminal H1.

[0009] Furthermore, the circuit input terminal includes a thermal fuse FT, a first protection circuit and a step switch connected in series, and the step switch is respectively connected to the off-shift input terminal, the first-shift input terminal, the second-shift input terminal and the third-shift input terminal;

[0010] The circuit output end includes a fuse FU and a step switch connected in series, and the step switch is respectively connected to the closed gear output end, the first gear output end, the second gear output end and the third gear output end.

[0011] Furthermore, the first protection circuit includes a resistor R2, a resistor R3, a diode D1 and a diode D2, and the diode D1 and the diode D2 are connected in series and then connected in parallel with the resistor R2 and the resistor R3 respectively.

[0012] Specifically, the first-gear input end is connected to the end H1 of the outer heating wire, the first-gear output end is connected to the end H2 of the outer heating wire, and a diode D7 is provided between the first-gear output end and the end H2, the positive pole of the diode D7 is connected to the end H2, and the negative pole of the diode D7 is connected to the first-gear output end.

[0013] Specifically, the second-level input end is connected to the end H3 of the inner heating wire through the diode D5, and the second-level output end is connected to the end H4 of the inner heating wire.

[0014] Specifically, the third gear input end is connected to the end H3 of the inner heating wire layer through diodes D4 and D5 in sequence, and the end H4 of the inner heating wire is connected to the third gear output end; the third gear input end is also connected to the end H1 of the outer heating wire, and the end H2 of the outer heating wire is connected to the third gear output end through diodes D7 and D10 in sequence.

[0015] More specifically, the anode of the diode D4 is connected to the input terminal of the third gear, the cathode of the diode D4 is connected to the input terminal of the diode D5, and the output terminal of the diode D5 is connected to the terminal H3; the anode of the diode D7 is connected to the terminal H2, the cathode of the diode D7 is connected to the anode of the diode D10, and the cathode of the diode D10 is connected to the output terminal of the third gear.

[0016] Furthermore, a diode D3, a resistor R1 and an LED lamp which are connected in series and conduct in one direction are provided between the step switch at the output end of the circuit and the step switch at the input end of the circuit.

[0017] The advantages of this application are:

[0018] 1. When the current in the circuit reaches its limit (for example, a short circuit occurs between the inner and outer heating wires), the current value is very high. Diode D9 and / or diode D6 will forward suppress the high current, preventing the safety protection function from being affected by excessive current. In addition, diodes D9 and D6 are connected in parallel at both ends of the inner and outer heating wires. Regardless of whether a poor contact occurs at either end of the load, it will not affect the flow of current in the inner and / or outer heating wire circuits, and thus will not affect the safety protection function.

[0019] 2. The circuit of this application adopts a load parallel connection method. When there is a short circuit between the internal and external heating wires, the protection function can be quickly activated, thereby shortening the time required for safety protection;

[0020] 3. In this application, since the inner heating wire is connected in parallel with the diode D9 and the outer heating wire is connected in parallel with the diode D6, the entire circuit mainly achieves a safety protection effect through this circuit structure. Such a circuit structure is simpler, more cost-effective, and can also improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure circuit of this application. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0025] In the description of this application, it should be noted that the terms "upper," "vertical," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0027] Example 1

[0028] like Figure 1 As shown, a novel multi-stage heating and safety protection control circuit for inner and outer wires includes a circuit input with multiple stages and a circuit output with multiple stages. The circuit input and output are respectively connected to an inner heating wire and an outer heating wire. The inner heating wire is connected in parallel with a diode D9, and the outer heating wire is connected in parallel with a diode D6. When the current in the circuit reaches a critical state (for example, when the inner heating wire or / and the outer heating wire are short-circuited), the current value is very high. Diode D9 and / or diode D6 will forward suppress the high current, preventing the safety protection function from being affected by excessive current. Furthermore, diodes D9 and D6 are connected in parallel at both ends of the inner and outer heating wires. Regardless of whether a poor contact occurs at either end of the load, this will not affect the flow of current in the inner heating wire circuit or / and the outer heating wire circuit, thus preventing the safety protection function from being affected.

[0029] Example 2

[0030] like Figure 1 As shown, a new type of inner and outer wire multi-speed heating and safety protection control circuit includes a circuit input end with multiple speeds and a circuit output end with multiple speeds. The inner heating wire and the outer heating wire are respectively connected between the circuit input end and the circuit output end. The inner heating wire is connected in parallel with a diode D9, and the outer heating wire is connected in parallel with a diode D6.

[0031] The two ends of the inner heating wire are terminal H3 and terminal H4 respectively, the positive pole of the diode D9 is connected to the terminal H4, and the negative pole of the diode D9 is connected to the terminal H3; the two ends of the outer heating wire are terminal H1 and terminal H2 respectively, the positive pole of the diode D6 is connected to the terminal H2, and the negative pole of the diode D6 is connected to the terminal H1.

[0032] The circuit input terminal includes a thermal fuse FT, a first protection circuit and a step switch connected in series, and the step switch is respectively connected to the closed gear input terminal, the first gear input terminal, the second gear input terminal and the third gear input terminal;

[0033] The circuit output end includes a fuse FU and a step switch connected in series, and the step switch is respectively connected to the closed gear output end, the first gear output end, the second gear output end and the third gear output end.

[0034] The step switches at the circuit output and input are adjusted synchronously. For example, when the output is level 1, the input is also level 1. This is equivalent to AC and AC poles.

[0035] The first protection circuit includes a resistor R2, a resistor R3, a diode D1, and a diode D2. The diode D1 and the diode D2 are connected in series and then connected in parallel with the resistor R2 and the resistor R3 respectively.

[0036] The first gear input end is connected to the end H1 of the outer heating wire, and the first gear output end is connected to the end H2 of the outer heating wire. A diode D7 is provided between the first gear output end and the end H2, and the positive electrode of the diode D7 is connected to the end H2, and the negative electrode of the diode D7 is connected to the first gear output end.

[0037] The second-level input end is connected to the end H3 of the inner heating wire through the diode D5, and the second-level output end is connected to the end H4 of the inner heating wire.

[0038] The third gear input end is connected to the end H3 of the inner heating wire layer through diodes D4 and D5 in sequence, and the end H4 of the inner heating wire is connected to the third gear output end; the third gear input end is also connected to the end H1 of the outer heating wire, and the end H2 of the outer heating wire is connected to the third gear output end through diodes D7 and D10 in sequence.

[0039] The anode of the diode D4 is connected to the input terminal of the third gear, the cathode of the diode D4 is connected to the input terminal of the diode D5, and the output terminal of the diode D5 is connected to the terminal H3; the anode of the diode D7 is connected to the terminal H2, the cathode of the diode D7 is connected to the anode of the diode D10, and the cathode of the diode D10 is connected to the output terminal of the third gear.

[0040] Between the step-down switch at the circuit's output and the step-down switch at the circuit's input, a diode D3, resistor R1, and LED light are connected in series and conduct unidirectionally. The LED light operates in a unidirectional state, so diode D3 protects the LED from reverse voltage surges, while resistor R1 limits the current. When these three components are connected in series and AC power is applied, they serve as a power indicator. Furthermore, if the protective resistors R2 and R3 are not properly soldered, the LED light will not illuminate, indicating a fault.

[0041] After knowing the solution of the present application, those skilled in the art will be able to know the specific installation direction of the diode, which will not be described in detail in this embodiment.

[0042] When the current in the circuit reaches its limit (for example, if the inner or / and outer heating wires are short-circuited), the current is very high, and diode D9 and / or diode D6 will forward-suppress the high current, preventing excessive current from affecting safety protection. Furthermore, diodes D9 and D6 are connected in parallel across the inner and outer heating wires. Regardless of poor contact at either end of the load, this will not affect the flow of current in the inner or / and outer heating wire circuits, nor will it affect safety protection performance.

[0043] The circuit adopts a load parallel connection method. When there is a short circuit between the inner and outer heating wires, the protection function can be quickly activated, thereby shortening the time required for safety protection. Since the inner heating wire is connected in parallel with the diode D9 and the outer heating wire is connected in parallel with the diode D6, the entire circuit mainly achieves the safety protection effect through this circuit structure. Such a circuit structure is simpler, more optimized, and more cost-effective.

Claims

1. A new type of internal and external wire multi-stage heating and safety protection control circuit, characterized by: It includes a circuit input end with multiple gears and a circuit output end with multiple gears. The circuit input end and the circuit output end are respectively connected with an inner heating wire and an outer heating wire. The inner heating wire is connected in parallel with a diode D9, and the outer heating wire is connected in parallel with a diode D6.

2. A novel internal and external wire multi-stage heating and safety protection control circuit according to claim 1, characterized in that: The two ends of the inner heating wire are terminal H3 and terminal H4 respectively, the positive pole of the diode D9 is connected to the terminal H4, and the negative pole of the diode D9 is connected to the terminal H3; the two ends of the outer heating wire are terminal H1 and terminal H2 respectively, the positive pole of the diode D6 is connected to the terminal H2, and the negative pole of the diode D6 is connected to the terminal H1.

3. A novel internal and external wire multi-stage heating and safety protection control circuit according to claim 2, characterized in that: The circuit input terminal includes a thermal fuse FT, a first protection circuit and a step switch connected in series, and the step switch is respectively connected to the off-shift input terminal, the first-shift input terminal, the second-shift input terminal and the third-shift input terminal; The circuit output end includes a fuse FU and a step switch connected in series, and the step switch is respectively connected to the closed gear output end, the first gear output end, the second gear output end and the third gear output end.

4. A novel internal and external wire multi-stage heating and safety protection control circuit according to claim 3, characterized in that: The first protection circuit includes a resistor R2, a resistor R3, a diode D1, and a diode D2. The diode D1 and the diode D2 are connected in series and then connected in parallel with the resistor R2 and the resistor R3 respectively.

5. A novel internal and external wire multi-stage heating and safety protection control circuit according to claim 4, characterized in that: The first gear input end is connected to the end H1 of the outer heating wire, the first gear output end is connected to the end H2 of the outer heating wire, and a diode D7 is provided between the first gear output end and the end H2, the positive pole of the diode D7 is connected to the end H2, and the negative pole of the diode D7 is connected to the first gear output end.

6. A novel internal and external wire multi-stage heating and safety protection control circuit according to claim 4, characterized in that: The second-level input end is connected to the end H3 of the inner heating wire via the diode D5, and the second-level output end is connected to the end H4 of the inner heating wire.

7. A novel internal and external wire multi-stage heating and safety protection control circuit according to claim 4, characterized in that: The third gear input end is connected to the end H3 of the inner heating wire layer through diodes D4 and D5 in sequence, and the end H4 of the inner heating wire is connected to the third gear output end; the third gear input end is also connected to the end H1 of the outer heating wire, and the end H2 of the outer heating wire is connected to the third gear output end through diodes D7 and D10 in sequence.

8. A novel multi-stage heating and safety protection control circuit for internal and external wires according to claim 7, characterized in that: The anode of the diode D4 is connected to the input terminal of the third gear, the cathode of the diode D4 is connected to the input terminal of the diode D5, and the output terminal of the diode D5 is connected to the terminal H3; the anode of the diode D7 is connected to the terminal H2, the cathode of the diode D7 is connected to the anode of the diode D10, and the cathode of the diode D10 is connected to the output terminal of the third gear.

9. A novel internal and external wire multi-stage heating and safety protection control circuit according to claim 1, characterized in that: A diode D3 , a resistor R1 and an LED lamp which are connected in series and are unidirectional are provided between the step switch at the output end of the circuit and the step switch at the input end of the circuit.

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