Electric blanket induced electric field detection and low electromagnetic leakage circuit

Abstract

The utility model belongs to the field of electric blanket, especially relate to a kind of electric blanket induction electric field detection and low electromagnetic leakage circuit, and low electromagnetic leakage control circuit module includes thyristor VS1 and thyristor VS2, the end H1 of outer layer heating wire is connected with the anode of thyristor VS1, the control electrode of thyristor VS1 is connected with MCU, and resistance R34 is connected in parallel between the anode and cathode of thyristor VS1;The cathode of thyristor VS1 is connected with the end H2 of inner layer heating wire, the end H3 of inner layer heating wire is connected with MCU and the anode of thyristor VS2 respectively, the cathode of thyristor VS2 is connected with one end of parallel resistance, the other end of parallel resistance is connected with diode anode, diode cathode is connected with the end H2 of inner layer heating wire, the control electrode of thyristor VS2 is connected with MCU, and the current flow direction of outer layer heating wire and inner layer heating wire is opposite.The application can basically eliminate electromagnetic leakage phenomenon, so that the electromagnetic radiation value of electric blanket is far lower than industry standard.

Description

Technical Field

[0001] This utility model belongs to the field of electric blanket applications, and in particular relates to an electric blanket induced electric field detection and low electromagnetic leakage circuit. Background Technology

[0002] In the current technological system of the electric blanket industry, there are still significant shortcomings and room for improvement in the field of electromagnetic safety detection and protection. Firstly, in the electromagnetic detection stage, the industry has not yet developed specialized circuits for detecting induced electric fields. Most companies still rely on external auxiliary equipment for testing, such as electric field meters and other specialized instruments for data collection and analysis. This reliance on external equipment not only increases the production and testing costs for companies but also suffers from low testing efficiency and cumbersome operating procedures. It is difficult to meet the rapid testing needs of large-scale production lines, and it also cannot achieve real-time electric field monitoring during product use, posing certain safety hazards to users.

[0003] Secondly, regarding low electromagnetic leakage protection, the current mainstream technical solutions in the industry are relatively simple, generally employing the method of connecting inner and outer resistance wires in opposite directions to weaken electromagnetic radiation. The principle is that the electromagnetic fields generated by the inner and outer resistance wires are in opposite directions, and partial cancellation is achieved through magnetic field superposition, thereby reducing electromagnetic leakage. However, practical applications show that the protective effect of this method is relatively limited, only reducing the intensity of electromagnetic radiation to a certain extent, and cannot fundamentally solve the problem of electromagnetic leakage. Some electromagnetic radiation will still be released outwards, and long-term use may have potential impacts on human health, especially for sensitive groups such as the elderly and children, where this risk is more pronounced. Summary of the Invention

[0004] This application addresses the aforementioned problems in the prior art by providing a circuit for detecting the induced electric field of an electric blanket and for low electromagnetic leakage.

[0005] To achieve the above-mentioned technical effects, the technical content of this application is as follows: An electric blanket induced electric field detection and low electromagnetic leakage circuit includes an MCU, a low electromagnetic leakage control circuit module, a display module and an induced electric field detection module, wherein the MCU is connected to the low electromagnetic leakage control circuit module, the display module and the induced electric field detection module respectively. The low electromagnetic leakage control circuit module includes a silicon controlled rectifier (SCR) VS1 and a SCR VS2. The end H1 of the outer heating wire is connected to the anode of the SCR VS1, and the control electrode of the SCR VS1 is connected to the MCU. A resistor R34 is connected in parallel between the anode and cathode of the SCR VS1. The cathode of the SCR VS1 is connected to the end H2 of the inner heating wire, and the end H3 of the inner heating wire is connected to both the MCU and the anode of the SCR VS2. The cathode of the SCR VS2 is connected to one end of the parallel resistor, and the other end of the parallel resistor is connected to the positive terminal of a diode. The negative terminal of the diode is connected to the end H2 of the inner heating wire, and the control electrode of the SCR VS2 is connected to the MCU. The outer heating wire is made of single-sided conductive aluminum foil wrapped around the outer metal wire, forming a protective and shielding layer. The inner heating wire is made of flat copper alloy wire wound with polyester filament to form a spiral structure, and the current flow directions between the outer and inner heating wires are opposite. The operation of the inner and outer heating wires is controlled by the on / off switching of SCRs VS1 and VS2 via MCU program output. The outer heating wire is made of single-sided conductive aluminum foil wrapped around the outer metal wire, forming a protective and shielding layer. The inner and outer heating wires are connected in a positive and negative connection method, which can basically shield the magnetic field from leakage to the outside. Figure 1 As shown, the current in the outer heating wire flows from H0 to H1, while the current in the inner heating wire flows from H2 to H3. Since it is a single heating wire, the current flows in opposite directions between the inner and outer heating wires.

[0006] Furthermore, the two ends of the outer and inner heating wires are connected in series, so that the current flows in opposite directions between the outer and inner heating wires. Since the inner and outer heating wires in this application have two solder points on one end, a reverse connection method must be used. Figure 2 As shown.

[0007] Furthermore, the parallel resistor is formed by resistors R2 and R3 connected in parallel.

[0008] Furthermore, the diode includes diode VD5 and diode VD6. The positive terminal of diode VD6 is connected to one end of the parallel resistor, the negative terminal of diode VD6 is connected to the positive terminal of diode VD5, and the negative terminal of diode VD5 is connected to the end H2 of the inner heating wire.

[0009] Furthermore, the end H0 of the outer heating wire is connected to the neutral wire N, and a fuse FU is provided between the end H0 and the neutral wire; the cathode of the thyristor VS2 is connected to the live wire, and a thermal fuse FT is provided between the cathode of the thyristor VS2 and the live wire L.

[0010] Furthermore, the induced electric field detection module includes a transistor VT1, the collector of which is connected to the power supply, the emitter of which is connected to the positive terminal of capacitor C5, the negative terminal of capacitor C5 is connected to the live wire L, and the base of which is connected in series with capacitor C6 and a floating wire.

[0011] Furthermore, the suspended wire is equivalent to an "antenna" used to establish an induced voltage, and is generally made of copper or an alloy.

[0012] Furthermore, a resistor R31 is connected in parallel with the capacitor C5, and a capacitor C6 is provided between the base of the transistor VT1 and the floating line; a resistor R32 is connected between the collector of the transistor VT1 and the power supply.

[0013] Furthermore, the length of the suspended line is greater than 150mm.

[0014] Furthermore, the MCU is connected to one end of capacitor C5; the MCU is connected to the positive terminal of LED LD4 through resistor R30, and the negative terminal of LED LD4 is connected to the live wire L terminal.

[0015] The testing principle of the induced electric field detection module is as follows: When the power supply is turned on, the floating wire in the circuit is equivalent to 0 voltage. When the L and N poles of the main circuit and the L and N poles of the socket are of the same polarity, the base of transistor VT1 is at a high voltage relative to the N pole, so transistor VT1 conducts. At this time, the positive terminal of capacitor C5 is at a high voltage, and the MCU determines that they are of the same polarity, so the LED LD4 does not light up. When the L and N poles of the main circuit and the L and N poles of the socket are of different polarities, the base of transistor VT1 is at a low voltage relative to the N pole, so transistor VT1 does not conduct. At this time, the positive terminal of capacitor C5 is at a low voltage, and the MCU determines that they are of different polarities, so the LED LD4 lights up.

[0016] Furthermore, the MCU is connected to the power supply, and the display module includes a display screen showing the output display levels. The MCU controls the output display levels.

[0017] The advantages of this application are: This application, based on the principle of opposite current directions in the inner and outer resistance wires, wraps a layer of single-sided conductive aluminum foil around the surface of the outer heating wire. This aluminum foil simultaneously serves as a shielding layer and a protective layer. From a technical perspective, the single-sided conductive aluminum foil possesses excellent electromagnetic shielding performance, effectively preventing the outward diffusion of electromagnetic radiation generated by the inner and outer heating wires. Combined with the counteracting magnetic fields of the inner and outer resistance wires, a dual protection mechanism is formed, which can essentially eliminate electromagnetic leakage, resulting in electromagnetic radiation values ​​of the electric blanket far below industry standards. Simultaneously, the aluminum foil layer also enhances the structural stability of the heating wire, reduces the risk of wear and breakage, extends product lifespan, and improves safety protection performance, providing a practical and feasible technical solution for safety upgrades in the electric blanket industry.

[0018] This application wraps a single-sided conductive aluminum film around the outer heating wire to shield the magnetic field from leakage to the outside. At the same time, it designs an induced electric field detection circuit, which can clearly indicate whether the electric blanket has an induced electric field at this time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall circuit structure of this application.

[0020] Figure 2 This is a schematic diagram showing the connection between the outer heating wire and the inner heating wire. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "upper," "vertical," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Example 1 like Figure 1 As shown, an electric blanket induced electric field detection and low electromagnetic leakage circuit includes an MCU, a low electromagnetic leakage control circuit module, a display module and an induced electric field detection module, wherein the MCU is connected to the low electromagnetic leakage control circuit module, the display module and the induced electric field detection module respectively; The low electromagnetic leakage control circuit module includes a silicon controlled rectifier (SCR) VS1 and a SCR VS2. The end H1 of the outer heating wire is connected to the anode of the SCR VS1, and the control electrode of the SCR VS1 is connected to the MCU. A resistor R34 is connected in parallel between the anode and cathode of the SCR VS1. The cathode of the SCR VS1 is connected to the end H2 of the inner heating wire, and the end H3 of the inner heating wire is connected to both the MCU and the anode of the SCR VS2. The cathode of the SCR VS2 is connected to one end of the parallel resistor, and the other end of the parallel resistor is connected to the anode of a diode. The cathode of the diode is connected to the end H2 of the inner heating wire, and the control electrode of the SCR VS2 is connected to the MCU. The outer heating wire is made of single-sided conductive aluminum foil wrapped around the outer metal wire, forming a protective and shielding layer. The inner heating wire is made of flat copper alloy wire wound with polyester filament to form a spiral structure, and the current flow directions between the outer and inner heating wires are opposite. The operation of the inner and outer heating wires is controlled by the on / off switching of SCRs VS1 and VS2 via MCU program output. The outer heating wire is made of single-sided conductive aluminum foil wrapped around the outer metal wire, forming a protective and shielding layer. The inner and outer heating wires are connected in a positive and negative connection method, which can basically shield the magnetic field from leakage to the outside. Figure 1 As shown, the current in the outer heating wire flows from H0 to H1, while the current in the inner heating wire flows from H2 to H3. Since it is a single heating wire, the current flows in opposite directions between the inner and outer heating wires.

[0027] This application, based on the principle of opposite current directions in the inner and outer resistance wires, wraps a layer of single-sided conductive aluminum foil around the surface of the outer heating wire. This aluminum foil simultaneously serves as a shielding layer and a protective layer. From a technical perspective, the single-sided conductive aluminum foil possesses excellent electromagnetic shielding performance, effectively blocking the outward diffusion of electromagnetic radiation generated by the outer heating wire. Combined with the counteracting magnetic fields of the inner and outer resistance wires, a dual protection mechanism is formed, which can essentially eliminate electromagnetic leakage, resulting in electromagnetic radiation values ​​of the electric blanket far below industry standards. Simultaneously, the aluminum foil layer also enhances the structural stability of the heating wire, reduces the risk of wear and breakage, extends product lifespan, and improves safety protection performance, providing a practical and feasible technical solution for safety upgrades in the electric blanket industry.

[0028] This application wraps a single-sided conductive aluminum film around the outer heating wire to shield the magnetic field from leakage to the outside. At the same time, it designs an induced electric field detection circuit, which can clearly indicate whether the electric blanket has an induced electric field at this time.

[0029] Example 2 like Figure 1 As shown, an electric blanket induced electric field detection and low electromagnetic leakage circuit includes an MCU, a low electromagnetic leakage control circuit module, a display module and an induced electric field detection module, wherein the MCU is connected to the low electromagnetic leakage control circuit module, the display module and the induced electric field detection module respectively. The low electromagnetic leakage control circuit module includes a silicon controlled rectifier (SCR) VS1 and a SCR VS2. The end H1 of the outer heating wire is connected to the anode of the SCR VS1, and the control electrode of the SCR VS1 is connected to the MCU. A resistor R34 is connected in parallel between the anode and cathode of the SCR VS1. The cathode of the SCR VS1 is connected to the end H2 of the inner heating wire, and the end H3 of the inner heating wire is connected to both the MCU and the anode of the SCR VS2. The cathode of the SCR VS2 is connected to one end of the parallel resistor, and the other end of the parallel resistor is connected to the anode of a diode. The cathode of the diode is connected to the end H2 of the inner heating wire, and the control electrode of the SCR VS2 is connected to the MCU. The outer heating wire is made of single-sided conductive aluminum foil wrapped around the outer metal wire, forming a protective and shielding layer. The inner heating wire is made of flat copper alloy wire wound with polyester filament to form a spiral structure, and the current flow directions between the outer and inner heating wires are opposite. The operation of the inner and outer heating wires is controlled by the on / off switching of SCRs VS1 and VS2 via MCU program output. The outer heating wire is made of single-sided conductive aluminum foil wrapped around the outer metal wire, forming a protective and shielding layer. The inner and outer heating wires are connected in a positive and negative connection method, which can basically shield the magnetic field from leakage to the outside. Figure 1 As shown, the current in the outer heating wire flows from H0 to H1, while the current in the inner heating wire flows from H2 to H3. Since it is a single heating wire, the current flows in opposite directions between the inner and outer heating wires.

[0030] By connecting the two ends of the outer and inner heating wires in series, the current flows in opposite directions between the outer and inner heating wires. Since the inner and outer heating wires in this application have two solder points on one end, a reverse connection method must be used. Figure 2 As shown.

[0031] The parallel resistor is formed by resistors R2 and R3 connected in parallel.

[0032] The diodes include diode VD5 and diode VD6. The positive terminal of diode VD6 is connected to one end of a parallel resistor, the negative terminal of diode VD6 is connected to the positive terminal of diode VD5, and the negative terminal of diode VD5 is connected to the end H2 of the inner heating wire.

[0033] The outer heating wire has its end H0 connected to the neutral wire N, and a fuse FU is installed between the end H0 and the neutral wire; the cathode of the thyristor VS2 is connected to the live wire, and a thermal fuse FT is installed between the cathode of the thyristor VS2 and the live wire L.

[0034] The induced electric field detection module includes a transistor VT1. The collector of the transistor VT1 is connected to the power supply, the emitter of the transistor VT1 is connected to the positive terminal of the capacitor C5, the negative terminal of the capacitor C5 is connected to the live wire L, and the base of the transistor VT1 is connected to the floating wire.

[0035] A suspended wire is like an "antenna" used to establish an induced voltage, and it is usually made of copper or an alloy.

[0036] A resistor R31 is connected in parallel with capacitor C5. A capacitor C6 is placed between the base of transistor VT1 and the floating line. A resistor R32 is connected between the collector of transistor VT1 and the power supply.

[0037] The length of the suspended wire is greater than 150mm.

[0038] Furthermore, the MCU is connected to one end of capacitor C5; the MCU is connected to the positive terminal of LED LD4 through resistor R30, and the negative terminal of LED LD4 is connected to the live wire L terminal.

[0039] The testing principle of the induced electric field detection module is as follows: When the power supply is turned on, the floating wire in the circuit is equivalent to 0 voltage. When the L and N poles of the main circuit and the L and N poles of the socket are of the same polarity, the base of transistor VT1 is at a high voltage relative to the N pole, so transistor VT1 conducts. At this time, the positive terminal of capacitor C5 is at a high voltage, and the MCU determines that they are of the same polarity, so the LED LD4 does not light up. When the L and N poles of the main circuit and the L and N poles of the socket are of different polarities, the base of transistor VT1 is at a low voltage relative to the N pole, so transistor VT1 does not conduct. At this time, the positive terminal of capacitor C5 is at a low voltage, and the MCU determines that they are of different polarities, so the LED LD4 lights up.

[0040] Furthermore, the MCU is connected to the power supply, and the display module includes a display screen showing the output display levels. The MCU controls the output display levels.

[0041] This application, based on the principle of opposite current directions in the inner and outer resistance wires, wraps a layer of single-sided conductive aluminum foil around the surface of the outer heating wire. This aluminum foil simultaneously serves as a shielding layer and a protective layer. From a technical perspective, the single-sided conductive aluminum foil possesses excellent electromagnetic shielding performance, effectively blocking the outward diffusion of electromagnetic radiation generated by the outer heating wire. Combined with the counteracting magnetic fields of the inner and outer resistance wires, a dual protection mechanism is formed, which can essentially eliminate electromagnetic leakage, resulting in electromagnetic radiation values ​​of the electric blanket far below industry standards. Simultaneously, the aluminum foil layer also enhances the structural stability of the heating wire, reduces the risk of wear and breakage, extends product lifespan, and improves safety protection performance, providing a practical and feasible technical solution for safety upgrades in the electric blanket industry.

[0042] This application wraps a single-sided conductive aluminum film around the outer heating wire to shield the magnetic field from leakage to the outside. At the same time, it designs an induced electric field detection circuit, which can clearly indicate whether the electric blanket has an induced electric field.

Claims

1. A circuit for detecting the induced electric field and reducing electromagnetic leakage in an electric blanket, characterized in that: It includes an MCU, a low electromagnetic leakage control circuit module, a display module, and an induced electric field detection module, wherein the MCU is connected to the low electromagnetic leakage control circuit module, the display module, and the induced electric field detection module respectively; The low electromagnetic leakage control circuit module includes a silicon controlled rectifier (SCR) VS1 and a SCR VS2. The end H1 of the outer heating wire is connected to the anode of the SCR VS1, and the control electrode of the SCR VS1 is connected to the MCU. A resistor R34 is connected in parallel between the anode and cathode of the SCR VS1. The cathode of the SCR VS1 is connected to the end H2 of the inner heating wire, and the end H3 of the inner heating wire is connected to both the MCU and the anode of the SCR VS2. The cathode of the SCR VS2 is connected to one end of the parallel resistor, and the other end of the parallel resistor is connected to the positive terminal of a diode. The negative terminal of the diode is connected to the end H2 of the inner heating wire, and the control electrode of the SCR VS2 is connected to the MCU. The outer heating wire is made of single-sided conductive aluminum foil wrapped around the outer metal wire to form a protective and shielding layer. The inner heating wire is made of flat copper alloy wire wound with polyester wire to form a spiral structure, and the current flow direction between the outer heating wire and the inner heating wire is opposite.

2. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 1, characterized in that: The parallel resistor is formed by resistors R2 and R3 connected in parallel.

3. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 1, characterized in that: The diodes include diode VD5 and diode VD6. The positive terminal of diode VD6 is connected to one end of a parallel resistor, the negative terminal of diode VD6 is connected to the positive terminal of diode VD5, and the negative terminal of diode VD5 is connected to the end H2 of the inner heating wire.

4. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 1, characterized in that: The outer heating wire has its end H0 connected to the neutral wire N, and a fuse FU is installed between the end H0 and the neutral wire; the cathode of the thyristor VS2 is connected to the live wire, and a thermal fuse FT is installed between the cathode of the thyristor VS2 and the live wire L.

5. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 1, characterized in that: The induced electric field detection module includes a transistor VT1. The collector of the transistor VT1 is connected to the power supply, the emitter of the transistor VT1 is connected to the positive terminal of the capacitor C5, the negative terminal of the capacitor C5 is connected to the live wire L, and the base of the transistor VT1 is connected to the floating wire.

6. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 5, characterized in that: The suspended wire is made of copper or an alloy, and its length is greater than 150mm.

7. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 5, characterized in that: A resistor R31 is connected in parallel with the capacitor C5. A capacitor C6 is placed between the base of the transistor VT1 and the floating line. A resistor R32 is connected between the collector of the transistor VT1 and the power supply.

8. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 5, characterized in that: The MCU is connected to one end of capacitor C5; the MCU is connected to the positive terminal of LED LD4 through resistor R30, and the negative terminal of LED LD4 is connected to the live wire L.

9. The electric blanket induced electric field detection and low electromagnetic leakage circuit according to claim 1, characterized in that: The MCU is connected to a power supply, and the display module includes a display screen that outputs display levels.

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