Wire harness low-voltage terminal and electrical equipment

Abstract

The invention discloses a wire harness low-voltage terminal and electrical equipment, relates to the technical field of power transmission, and comprises a wire harness low-voltage terminal composed of an energy transmitting module and a plurality of energy receiving modules. Wherein the energy emission module is connected with a power supply voltage end and is used for generating and outputting electromagnetic waves according to accessed power supply voltage; the plurality of energy receiving modules are respectively provided with a pluggable interface and are used for converting accessed electromagnetic waves into power supply voltage to supply power to a load when the energy receiving modules are connected with the load through the pluggable interfaces, so that the situation that a conventional wiring harness low-voltage terminal transmits the power supply voltage based on a connecting line is avoided; and the problems of poor contact reliability and high maintenance cost are solved.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission, and particularly relates to a low-voltage terminal of a wire harness and an electrical device. Background Art

[0002] Currently, the low-voltage terminals of wire harnesses on the market generally adopt the connection method of connecting wires, and achieve electrical conduction through mechanical contact of metal contacts. However, the reliability problems exposed during their long-term use are becoming increasingly prominent.

[0003] The micro-movement wear and environmental oxidation during the plugging and unplugging process cause a significant increase in the contact resistance. Experiments show that the contact resistance of copper-tin-plated terminals increases from 5 mΩ to 15 mΩ after 500 pluggings and unpluggings, far exceeding the 10 mΩ limit of the ISO 16750 standard, leading to the risks of excessive voltage drop and overheating with a local temperature rise exceeding 30 K. Especially under the vibration condition of 30 g acceleration in the engine compartment of an automobile, the loosening of the terminal will cause the contact area to suddenly decrease by 60%, posing a serious hidden danger of open circuit. In addition, the mechanical life of the traditional single-point snap-lock structure is insufficient. The plugging and unplugging life of vehicle-mounted connectors is mostly limited to 300 - 500 times, while in high-frequency usage scenarios such as shared cars, the annual number of pluggings and unpluggings exceeds 2000 times, resulting in a plastic deformation rate of the terminal reaching 18%, and frequent replacement significantly increases the maintenance cost. Summary of the Invention

[0004] The main purpose of the present application is to provide a low-voltage terminal of a wire harness and an electrical device, aiming to solve the technical problems of poor contact reliability and high maintenance cost existing in the current linear low-voltage terminals using the connection method of connecting wires.

[0005] To achieve the above object, the present application proposes a low-voltage terminal of a wire harness, which is composed of an energy emission module and a plurality of energy receiving modules;

[0006] The energy emission module is connected to the power supply voltage terminal, and is used to generate and output electromagnetic waves according to the applied supply voltage;

[0007] A plurality of energy receiving modules are respectively provided with insertable interfaces, and are used to convert the applied electromagnetic waves into a supply voltage when connected to a load through the insertable interfaces, and perform a power supply operation on the load.

[0008] In one embodiment, the energy emission module is composed of a power supply filtering unit, a high-frequency inverter unit, a first resonance matching network unit, and a transmitting coil;

[0009] The input end of the power supply filtering unit is connected to the power supply voltage terminal, the output end of the power supply filtering unit is connected to the input end of the high-frequency inverter unit, the output end of the high-frequency inverter unit is connected to the input end of the resonance matching network unit, the output end of the resonance matching network unit is connected to the first end of the transmitting coil, and the second end of the transmitting coil is connected to the ground terminal.

[0010] In one embodiment, the power filter unit includes a common-mode choke coil, a first capacitor, and a second capacitor;

[0011] The first end of the common-mode choke coil is connected to the positive pole of the power supply voltage terminal, the second end of the common-mode choke coil is connected to the first end of the first capacitor, and the second end of the first capacitor forms the positive output terminal of the power filter unit;

[0012] The third end of the common-mode choke coil is connected to the negative pole of the power supply voltage terminal, the fourth end of the common-mode choke coil is connected to the first end of the second capacitor, and the second end of the second capacitor forms the negative output terminal of the power filter unit.

[0013] In one embodiment, the high-frequency inverter unit includes a first switching tube, a resonant inductor, and a resonant capacitor;

[0014] The input end of the first switching tube is connected to the positive output terminal of the power filter unit, the output end of the first switching tube is connected to the first end of the resonant inductor, the second end of the resonant inductor is connected to the first end of the resonant capacitor, and the second end of the resonant capacitor is connected to the negative output terminal of the power filter unit.

[0015] In one embodiment, the first resonant matching network unit includes a first inductor, a third capacitor, and a fourth capacitor;

[0016] The first end of the first inductor is connected to the connection line between the resonant capacitor and the negative output terminal of the power filter unit, the second end of the first inductor is connected to the first end of the third capacitor, and the second end of the third capacitor is connected to the first end of the transmitting coil;

[0017] The fourth capacitor is connected in parallel with the third capacitor.

[0018] In one embodiment, the energy receiving module is composed of a receiving coil, a second resonant matching network unit, a rectifying and filtering unit, and a DC voltage stabilizing unit;

[0019] The first end of the receiving coil is connected to the input end of the second resonant matching network unit, the output end of the second resonant matching network unit is connected to the input end of the rectifying and filtering unit, the output end of the rectifying and filtering unit is connected to the input end of the DC voltage stabilizing unit, and the output end of the DC voltage stabilizing unit is connected to the power supply access end of the load.

[0020] In one embodiment, the second resonant matching network unit includes a second inductor, a fifth capacitor, and a sixth capacitor;

[0021] The first end of the second inductor is connected to the first end of the receiving coil, the second end of the second inductor is connected to the first end of the fifth capacitor, the second end of the fifth capacitor is connected to the input end of the rectifying and filtering unit, and the sixth capacitor is connected in parallel with the fifth capacitor.

[0022] In one embodiment, the rectifying and filtering unit includes a transformer, a first diode, a second diode, and a first resistor;

[0023] The transformer consists of a primary coil and a secondary coil. The second terminal of the fifth capacitor is connected to the first terminal of the primary coil, and the second terminal of the primary coil and the second terminal of the receiving coil are commonly grounded.

[0024] The positive electrode of the first diode is connected to the first terminal of the secondary coil, the positive electrode of the second diode is connected to the second terminal of the secondary coil, the first terminal of the first resistor is connected to the midpoint of the secondary coil, and the negative electrodes of the first diode, the negative electrode of the second diode, and the second terminal of the first resistor are commonly connected to form the output terminal of the rectifying and filtering unit.

[0025] In one embodiment, the DC voltage stabilizing unit includes a first transistor, a second resistor, and a Zener diode.

[0026] The input terminal of the first transistor is connected to the output terminal of the rectifying and filtering unit, the control terminal of the first transistor is connected to the negative electrode of the Zener diode, and the output terminal of the first transistor is connected to the positive power supply access terminal of the load.

[0027] The positive electrode of the Zener diode is connected to the wire connecting the output terminal of the rectifying and filtering unit and the negative power supply access terminal of the load. The first terminal of the second resistor is connected to the wire connecting the first transistor and the rectifying and filtering unit, and the second terminal of the second resistor is connected to the wire connecting the first transistor and the Zener diode.

[0028] In addition, to achieve the above object, the present application also provides an electrical device, which includes the low-voltage terminal of the wire harness as described above.

[0029] One or more technical solutions proposed by the present application have at least the following technical effects:

[0030] A low-voltage terminal of a wire harness composed of an energy emission module and a plurality of energy receiving modules is proposed. Among them, the energy emission module is connected to the power supply voltage terminal and is used to generate and output electromagnetic waves according to the accessed supply voltage; a plurality of energy receiving modules are respectively provided with insertable interfaces, which are used to convert the accessed electromagnetic waves into a supply voltage when connected to the load through the insertable interfaces and supply power to the load.

[0031] Wireless transmission of the supply voltage is achieved through magnetic resonance between the energy emission module and the energy receiving module, thereby avoiding the problems of poor contact reliability and high maintenance cost existing in the conventional low-voltage terminal of the wire harness for transmitting the supply voltage based on a connecting wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic diagram of the module structure of the low-voltage terminal of the wire harness of the present application;

[0035] Figure 2 It is a schematic diagram of the module structure of the energy emission module of the present application;

[0036] Figure 3 It is a schematic diagram of the circuit structure of the energy emission module of the present application;

[0037] Figure 4 It is a schematic diagram of the module structure of the energy reception module of the present application;

[0038] Figure 5 It is a schematic diagram of the circuit structure of the energy reception module of the present application.

[0039] Explanation of the reference numerals in the drawings:

[0040] 10. Energy emission module; 101. Power supply filtering unit; 102. High-frequency inverter unit; 103. First resonance matching network unit; 104. Transmitting coil; L1. Common-mode choke coil; C1. First capacitor; C2. Second capacitor; G1. First switching tube; L2. Resonance inductor; C3. Resonance capacitor; L3. First inductor; C4. Third capacitor; C5. Fourth capacitor;

[0041] 20. Energy reception module; 201. Receiving coil; 202. Second resonance matching network unit; 203. Rectifying and filtering unit; 204. DC voltage stabilizing unit; L4. Second inductor; C6. Fifth capacitor; C7. Sixth capacitor; T1. Transformer; D1. First diode; R1. First resistor; D2. Second diode; R2. Second resistor; G2. First transistor; D3. Zener diode.

[0042] The realization of the purpose, functional features and advantages of the present application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0044] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of this application, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of this application, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or inability to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0046] The main solution of the embodiments of this application is: to propose a low-voltage terminal of a wire harness composed of an energy emission module and multiple energy receiving modules. Among them, the energy emission module is connected to the power supply voltage terminal and is used to generate and output electromagnetic waves according to the accessed supply voltage; each of the multiple energy receiving modules is provided with an insertable interface, which is used to convert the accessed electromagnetic waves into a supply voltage when connected to a load through the insertable interface and perform a power supply operation on the load.

[0047] Since the low-voltage terminals of wire harnesses on the market currently generally adopt the connection method of connecting wires and achieve conduction through mechanical contact of metal contacts, the reliability problems exposed during their long-term use have become increasingly prominent. The micro-movement wear and environmental oxidation during the plugging and unplugging process cause a significant increase in the contact resistance. Experiments show that the contact resistance of a tin-plated copper terminal increases from 5 mΩ to 15 mΩ after 500 pluggings and unpluggings, far exceeding the 10 mΩ limit of the ISO 16750 standard, triggering the risks of excessive voltage drop and overheating with a local temperature rise exceeding 30 K. Especially under the vibration condition of 30 g acceleration in the engine compartment of an automobile, the loosening of the terminal will cause the contact area to suddenly decrease by 60%, posing a serious hidden danger of open circuit. In addition, the mechanical life of the traditional single-point snap-lock structure is insufficient. The plugging and unplugging life of vehicle-mounted connectors is mostly limited to 300 - 500 times, while in high-frequency usage scenarios such as shared cars, the annual number of pluggings and unpluggings exceeds 2000 times, resulting in a plastic deformation rate of the terminal reaching 18%. Frequent replacement significantly increases the maintenance cost.

[0048] The present application provides a solution, which realizes the wireless transmission of the power supply voltage through magnetic field resonance between the energy emission module and the energy receiving module, so as to avoid the problems of poor contact reliability and high maintenance cost existing in the transmission of the power supply voltage by the conventional low-voltage terminals of the wire harness based on the connecting wires.

[0049] Based on this, an embodiment of the present application provides a low-voltage terminal of a wire harness. Refer to Figure 1 , Figure 1 which is a schematic diagram of the module structure of the low-voltage terminal of the wire harness of the present application.

[0050] The low-voltage terminal of the wire harness is composed of an energy emission module 10 and a plurality of energy receiving modules 20. The energy emission module 10 is connected to the power supply voltage terminal and is used to generate and output electromagnetic waves according to the accessed power supply voltage. Each of the plurality of energy receiving modules 20 is provided with an insertable interface, which is used to convert the accessed electromagnetic waves into a power supply voltage and supply power to the load when connected to the load through the insertable interface.

[0051] In this embodiment, in order to solve the problems of low transmission reliability and high later maintenance cost existing in the transmission of the power supply voltage by the low-voltage terminals of the wire harness on the market, it is proposed to change the low-voltage terminal of the wire harness from wired transmission to wireless transmission, which is specifically realized through the energy emission module 10 and the energy receiving module 20.

[0052] Among them, the energy emission module 10 is installed at the position of the low-voltage terminal of the wire harness and is used to output the power supply voltage on the power supply voltage terminal as electromagnetic waves. The energy receiving module 20 is not installed inside the electrical equipment, but is placed in the placement slot of the electrical equipment or directly independent of the electrical equipment. An insertable interface (such as a USB interface) is provided on the energy receiving module 20. When the energy receiving module 20 is connected to the load through the insertable interface, it is considered that the power supply voltage needs to be transmitted at this time. The energy receiving module 20 will enter the operating state, receive the electromagnetic waves propagating in the air, and convert the electromagnetic waves into a power supply voltage to realize the wireless power supply operation for the load.

[0053] As can be seen from the above, based on the energy emission module 10 and the energy receiving module 20, the wireless transmission of the power supply voltage can be realized without connecting the electrical equipment and the load with connecting wires, so as to avoid the problems of low reliability and high later maintenance cost existing in the transmission based on the connecting wires.

[0054] Refer to Figure 2 As shown, the energy emission module 10 in this embodiment is composed of a power supply filtering unit 101, a high-frequency inversion unit 102, a first resonance matching network unit 103, and a transmitting coil 104.

[0055] The input end of the power supply filtering unit 101 is connected to the power supply voltage terminal, the output end of the power supply filtering unit 101 is connected to the input end of the high-frequency inversion unit 102, the output end of the high-frequency inversion unit 102 is connected to the input end of the resonance matching network unit, the output end of the resonance matching network unit is connected to the first end of the transmitting coil 104, and the second end of the transmitting coil 104 is connected to the ground terminal.

[0056] It should be noted that by connecting with the high-frequency inversion unit 102, the power supply filtering unit 101 can achieve common-mode noise suppression for the power supply voltage accessed from the power supply voltage terminal through the high-frequency inversion unit 102, and at the same time filter out differential-mode noise; while the high-frequency inversion unit 102 is connected to the first resonance matching network unit 103, which can realize the generation of high-frequency energy and soft switching, and avoid the loss problem existing in power conversion without the need to additionally set heat dissipation devices; the first resonance matching network is connected to the transmitting coil 104, which can maximize the energy transmission efficiency, enhance the magnetic field intensity, and achieve a high-efficiency, high-reliability and strong anti-interference energy emission module 10.

[0057] For the specific energy emission module 10, reference can be made to Figure 3 as shown.

[0058] The power supply filtering unit 101 includes a common-mode choke coil L1, a first capacitor C1 and a second capacitor C2. The first end of the common-mode choke coil L1 is connected to the positive pole of the power supply voltage terminal, the second end of the common-mode choke coil L1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 forms the positive output end of the power supply filtering unit 101; the third end of the common-mode choke coil L1 is connected to the negative pole of the power supply voltage terminal, the fourth end of the common-mode choke coil L1 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 forms the negative output end of the power supply filtering unit 101.

[0059] First, the functions of the components in the power supply filtering unit 101 will be described. The common-mode choke coil L1 is used to suppress common-mode noise (such as the interference existing when the power supply voltage starts to input the power supply voltage), the first capacitor C1 is used to filter out differential-mode noise (such as the high-frequency interference between the positive and negative poles of the power supply voltage), and the second capacitor C2 is used to filter out common-mode noise (such as the high-frequency interference between the positive and negative poles of the power supply voltage and the ground). Through the cooperation of the common-mode choke coil L1, the first capacitor C1 and the second capacitor C2, the high-frequency noise on the power supply voltage terminal is attenuated, and the high-frequency conduction interference is suppressed, so as to ensure that the subsequent high-frequency inversion unit 102 is not affected by this interference.

[0060] The high-frequency inverter unit 102 includes a first switching tube G1, a resonant inductor L2, and a resonant capacitor C3. The input end of the first switching tube G1 is connected to the positive output end of the power supply filtering unit 101. The output end of the first switching tube G1 is connected to the first end of the resonant inductor L2. The second end of the resonant inductor L2 is connected to the first end of the resonant capacitor C3. The second end of the resonant capacitor C3 is connected to the negative output end of the power supply filtering unit 101. The purpose is to convert the supply voltage in the form of direct current into high-frequency alternating current to achieve wireless energy transmission.

[0061] The resonant capacitor C3 can store magnetic field energy, limit the current rising rate, achieve linear growth of the current, and provide energy buffering for subsequent resonance; the resonant capacitor C3 stores electric field energy, cooperates with the resonant inductor L2 to form a resonant network, converts the supply current formed by the pulsed current output by the first switching tube G1 into a sine wave, thereby reducing high-frequency harmonic losses, and at the same time creates conditions for soft switching by reversing the voltage polarity; the first switching tube G1, as a high-speed switch, provides a low-impedance path during conduction, minimizes conduction losses, and ensures efficient injection of high-frequency energy into the resonant network through rapid switching.

[0062] Specifically: the input end of the first switching tube G1 is connected to the positive output end of the power supply filtering unit 101, aiming to provide a low-noise DC input and reduce the reverse pollution of the switching noise to the power supply; the output end of the first switching tube G1 is connected to the first end of the resonant inductor L2, aiming to introduce the pulsed current after chopping by the first switching tube G1 into the first resonant matching network unit 103 and force the current to be sinusoidal; the second end of the resonant inductor L2 is connected to the first end of the resonant capacitor C3, aiming to form an inductor-capacitor series resonant circuit to achieve energy circulation and soft-switching conditions.

[0063] When the first switching tube G1 is turned on, the high-frequency inverter unit 102 realizes high-frequency and efficient energy transfer through the energy form conversion of DC-pulse-resonant sine wave.

[0064] The first resonant matching network unit 103 includes a first inductor L3, a third capacitor C4, and a fourth capacitor C5. The first end of the first inductor L3 is connected to the connection line between the resonant capacitor C3 and the negative output end of the power supply filtering unit 101. The second end of the first inductor L3 is connected to the first end of the third capacitor C4. The second end of the third capacitor C4 is connected to the first end of the transmitting coil 104; the fourth capacitor C5 is connected in parallel with the third capacitor C4.

[0065] Among them, the first inductor L3 is used to suppress high-frequency current, reduce switching noise, and jointly set the required series resonance frequency with the third capacitor C4 to ensure that the output frequency of the high-frequency inverter unit 102 is aligned with the resonance point; the third capacitor C4 is used to block the DC component and prevent the DC bias of the high-frequency inverter unit 102 from damaging the subsequent circuit, and cooperate with the first inductor L3 to maximize the fundamental wave current and improve the transmission efficiency; the fourth capacitor C5 provides a parallel path for high-frequency current, reduces the equivalent impedance on the high-frequency inverter unit 102 side, and at the same time can adjust the total impedance of the first resonance matching network unit 103 to a capacitive load, compensate for the inductive impedance of the transmitting coil 104, achieve a zero phase angle, and reduce reactive power loss.

[0066] It should be noted that the transmitting coil 104, as the energy transmitting end of the energy transmitting module 10, converts high-frequency current into an alternating magnetic field and propagates electromagnetic waves into the air.

[0067] Refer to Figure 4 As shown, the energy receiving module 20 in this embodiment is composed of a receiving coil 201, a second resonance matching network unit 202, a rectifying and filtering unit 203, and a DC voltage stabilizing unit 204.

[0068] The first end of the receiving coil 201 is connected to the input end of the second resonance matching network unit 202, the output end of the second resonance matching network unit 202 is connected to the input end of the rectifying and filtering unit 203, the output end of the rectifying and filtering unit 203 is connected to the input end of the DC voltage stabilizing unit 204, and the output end of the DC voltage stabilizing unit 204 is connected to the power supply access end of the load.

[0069] Specifically, the receiving coil 201 receives the electromagnetic waves propagated by the transmitting coil 104 in the air through spatial magnetic field coupling, and is directly connected to the second resonance matching network unit 202 to form a closed resonance circuit, realizing the basis of magnetic energy-electric energy conversion and impedance matching; while the rectifying and filtering unit 203 receives the high-frequency alternating current output by the second resonance matching network unit 202, rectifies the high-frequency alternating current and outputs it as pulsed direct current, and outputs it as a smooth waveform through filtering, so it can realize AC-DC conversion and ripple suppression; the DC voltage stabilizing unit 204 receives the filtered DC voltage, stabilizes it and outputs it to the load for power supply, playing the role of precise voltage regulation and input range adaptation.

[0070] Specifically, the energy receiving module 20 can be referred to Figure 5 As shown.

[0071] The second resonance matching network unit 202 includes a second inductor L4, a fifth capacitor C6, and a sixth capacitor C7. The first end of the second inductor L4 is connected to the first end of the receiving coil 201. The second end of the second inductor L4 is connected to the first end of the fifth capacitor C6. The second end of the fifth capacitor C6 is connected to the input end of the rectifying and filtering unit 203. The sixth capacitor C7 is connected in parallel with the fifth capacitor C6.

[0072] The series connection of the second inductor L4 and the fifth capacitor C6 can form a series resonance to synchronize with the receiving coil 201, ensuring efficient coupling of magnetic field energy. The sixth capacitor C7 connected in parallel with the fifth capacitor C6 can cancel the impedance offset caused by the change in mutual inductance between the receiving coil 201 and the transmitting coil 104, adjust the equivalent impedance of the transmitting coil 104 to a capacitive load, and make the transformer T1 side present a pure resistive load, maximizing the power transmission efficiency.

[0073] Specifically, after the receiving coil 201 receives the electromagnetic wave in the air, the series-connected second inductor L4 and fifth capacitor C6 dynamically compensate for the inductance offset caused by the change in coupling distance, and the parallel-connected sixth capacitor C7 filters out the non-resonant frequency components, retaining the fundamental wave energy.

[0074] The rectifying and filtering unit 203 includes a transformer T1, a first diode D1, a second diode D2, and a first resistor R1. The transformer T1 is composed of a primary coil and a secondary coil. The second end of the fifth capacitor C6 is connected to the first end of the primary coil. The second end of the primary coil and the second end of the receiving coil 201 are commonly grounded. The positive electrode of the first diode D1 is connected to the first end of the secondary coil. The positive electrode of the second diode D2 is connected to the second end of the secondary coil. The first end of the first resistor R1 is connected to the midpoint of the secondary coil. The negative electrodes of the first diode D1, the negative electrode of the second diode D2, and the second end of the first resistor R1 are commonly connected to form the output end of the rectifying and filtering unit 203.

[0075] It should be noted that the transformer T1 in this embodiment is a center-tapped transformer T1.

[0076] Specifically, after connecting to the high-frequency alternating current, during the positive half-cycle of the high-frequency alternating current, the first end of the secondary coil is at a positive potential, the center tap is at 0 potential, and the second end of the secondary coil is at a negative potential, causing the current to flow through the forward bias in the first diode D1. During this period, the second diode D2 is in a reverse bias state.

[0077] During the negative half-cycle of the high-frequency alternating current, the second end of the secondary coil and the center tap are at a positive potential, and the first end of the secondary coil is at a negative potential, causing the current to flow through the forward bias in the second diode D2. During this period, the first diode D1 is in a reverse bias state. Therefore, when both the positive half-cycle and the negative half-cycle allow conduction, a doubled DC voltage will be output at this time. Among them, the first resistor R1 plays a filtering role.

[0078] The DC regulated voltage unit 204 includes a first transistor G2, a second resistor R2, and a Zener diode D3. The input terminal of the first transistor G2 is connected to the output terminal of the rectification and filtering unit 203. The control terminal of the first transistor G2 is connected to the negative electrode of the Zener diode D3. The output terminal of the first transistor G2 is connected to the positive power supply access terminal of the load. The positive electrode of the Zener diode D3 is connected to the wire connecting the output terminal of the rectification and filtering unit 203 and the negative power supply access terminal of the load. The first end of the second resistor R2 is connected to the wire connecting the first transistor G2 and the rectification and filtering unit 203. The second end of the second resistor R2 is connected to the wire connecting the first transistor G2 and the Zener diode D3.

[0079] Among them, the Zener diode D3 is used to conduct and maintain a constant voltage across both ends when the reverse voltage reaches the breakdown value, providing a stable reference for the control terminal of the first transistor G2. The first resistor R1 is used to limit the current of the Zener diode D3 and the first transistor G2 to avoid damage. At the same time, it can also share the difference between the input DC voltage and the Zener diode D3 to ensure that the first transistor G2 operates in the safe area. The first transistor G2 dynamically adjusts its conduction state according to the voltage value input to the control terminal, and at the same time bears the voltage difference between the DC voltage and the load, thereby realizing the transmission of a stable supply voltage to the load.

[0080] In this embodiment, by changing the low-voltage terminal of the wire harness to a power transmission technology based on magnetic field coupling, through the non-contact energy transfer between the energy emission module 10 and the receiving module, it is possible to break through the limitations of traditional physical connections and achieve a more efficient, safer, and more flexible power transmission system. The core lies in integrating the energy emission module 10 on the side of the original low-voltage terminal of the wire harness. The high-frequency inverter unit 102 converts direct current into alternating current, driving the first resonance matching network unit 103 to generate a high-intensity alternating magnetic field. The energy receiving module 20 is inserted into the load, captures the magnetic field energy through the receiving coil 201, and outputs a stable supply voltage after synchronous rectification and filtering and voltage regulation. This architecture reconstructs the energy transfer path through the principle of electromagnetic induction, enabling electric energy to cross the physical gap through the magnetic field, getting rid of the bondage of traditional wire harnesses relying on metal conductor contacts, and showing significant technical advantages in terms of transmission efficiency, environmental adaptability, contact reliability, and later cost.

[0081] In terms of energy transmission efficiency, the magnetic field coupling technology can significantly reduce energy loss through the precise alignment of the resonance frequency and the optimized design of the impedance matching network. The voltage drop problem caused by the contact resistance and cable impedance of traditional wire harness terminals is completely eliminated. The first resonance matching network unit 103 of the energy emission module 10 and the second resonance matching network unit 202 of the energy receiving module 20 form double resonance points, improving the transmission efficiency and still maintaining stable efficiency in the dynamic load scenario.

[0082] Meanwhile, the physical property of magnetic field coupling naturally forms electrical isolation between the power voltage terminal and the load, completely eliminating the short - circuit risk caused by insulation aging and moisture leakage of traditional wire harnesses. The energy emission module 10 and the receiving module transfer energy through an air medium, and the withstand voltage difference can reach 3000Vrms (meeting the IEC 60601 - 1 medical device safety standard). This isolation property is particularly important in industrial control and medical devices. For example, in the scenario of power supply to the joints of surgical robots, it can not only prevent high - frequency interference from the motor drive circuit from being coupled into sensitive control signal lines, but also prevent potential safety hazards caused by accidental conduction of the patient - contact part.

[0083] The environmental adaptability and installation flexibility of electronic devices have been revolutionarily improved. Traditional wire - harness terminals have strict requirements for plug - in accuracy, while magnetic field coupling technology allows for offsets in the positions of the energy emission module 10 and the energy receiving module 20 through magnetic field distribution optimization. This property is of great value in scenarios such as automotive chassis wire harnesses with frequent vibrations or power supply for rotating machinery. For example, in the transformation of electric - vehicle charging sockets, the energy emission module 10 can be embedded in the charging gun head, and the energy receiving module 20 can be placed inside the vehicle charging port. The driver only needs to bring the gun head close to the charging port (without precisely aligning with the jack) to start charging, significantly improving the operation convenience.

[0084] This application also provides an electrical device, which includes the above - mentioned low - voltage wire - harness terminal. The low - voltage wire - harness terminal is composed of an energy emission module 10 and multiple energy receiving modules 20;

[0085] The energy emission module 10 is connected to the power voltage terminal and is used to generate and output electromagnetic waves according to the accessed supply voltage;

[0086] Each of the multiple energy receiving modules 20 is provided with an insertable interface, which is used to convert the accessed electromagnetic waves into a supply voltage when connected to the load through the insertable interface and perform a power - supply operation on the load.

[0087] The above are only partial embodiments of this application, and thus do not limit the patent scope of this application. Any equivalent structural transformation made under the technical concept of this application, using the content of the specification and drawings of this application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of this application.

Claims

1. A low-voltage terminal for a wire harness, characterized in that, The low-voltage terminal of the wire harness is composed of an energy emission module and a plurality of energy receiving modules; The energy emission module is connected to the power supply voltage terminal and is used to generate and output electromagnetic waves according to the accessed supply voltage; A plurality of the energy receiving modules are respectively provided with insertable interfaces, which are used to convert the accessed electromagnetic waves into a supply voltage when connected to a load through the insertable interfaces, and perform a power supply operation on the load.

2. The low-voltage terminal of the wire harness according to claim 1, characterized in that, The energy emission module is composed of a power supply filtering unit, a high-frequency inversion unit, a first resonance matching network unit and a transmitting coil; The input end of the power supply filtering unit is connected to the power supply voltage terminal, the output end of the power supply filtering unit is connected to the input end of the high-frequency inversion unit, the output end of the high-frequency inversion unit is connected to the input end of the resonance matching network unit, the output end of the resonance matching network unit is connected to the first end of the transmitting coil, and the second end of the transmitting coil is connected to the ground terminal.

3. The low-voltage terminal of the wire harness according to claim 2, characterized in that The power supply filtering unit includes a common-mode choke coil, a first capacitor and a second capacitor; The first end of the common-mode choke coil is connected to the positive pole of the power supply voltage terminal, the second end of the common-mode choke coil is connected to the first end of the first capacitor, and the second end of the first capacitor forms the positive output end of the power supply filtering unit; The third end of the common-mode choke coil is connected to the negative pole of the power supply voltage terminal, the fourth end of the common-mode choke coil is connected to the first end of the second capacitor, and the second end of the second capacitor forms the negative output end of the power supply filtering unit.

4. The low-voltage terminal of the wire harness according to claim 3, characterized in that, The high-frequency inversion unit includes a first switching tube, a resonance inductor and a resonance capacitor; The input end of the first switching tube is connected to the positive output end of the power supply filtering unit, the output end of the first switching tube is connected to the first end of the resonance inductor, the second end of the resonance inductor is connected to the first end of the resonance capacitor, and the second end of the resonance capacitor is connected to the negative output end of the power supply filtering unit.

5. The low-voltage terminal of the wire harness according to claim 4, wherein The first resonance matching network unit includes a first inductor, a third capacitor and a fourth capacitor; The first end of the first inductor is connected to the connection line between the resonance capacitor and the negative output end of the power supply filtering unit, the second end of the first inductor is connected to the first end of the third capacitor, and the second end of the third capacitor is connected to the first end of the transmitting coil; The fourth capacitor is connected in parallel with the third capacitor.

6. The low-voltage terminal of the wire harness according to claim 1, characterized in that, The energy receiving module is composed of a receiving coil, a second resonance matching network unit, a rectifying and filtering unit and a DC voltage stabilizing unit; The first end of the receiving coil is connected to the input end of the second resonance matching network unit, the output end of the second resonance matching network unit is connected to the input end of the rectifying and filtering unit, the output end of the rectifying and filtering unit is connected to the input end of the DC voltage stabilizing unit, and the output end of the DC voltage stabilizing unit is connected to the power supply access end of the load.

7. The low-voltage terminal of the wire harness according to claim 6, characterized in that, The second resonance matching network unit includes a second inductor, a fifth capacitor and a sixth capacitor; The first end of the second inductor is connected to the first end of the receiving coil, the second end of the second inductor is connected to the first end of the fifth capacitor, the second end of the fifth capacitor is connected to the input end of the rectifying and filtering unit, and the sixth capacitor is connected in parallel with the fifth capacitor.

8. The low-voltage terminal of the wire harness according to claim 7, characterized in that The rectifying and filtering unit includes a transformer, a first diode, a second diode, and a first resistor; The transformer consists of a primary coil and a secondary coil. The second end of the fifth capacitor is connected to the first end of the primary coil, and the second end of the primary coil and the second end of the receiving coil are commonly grounded; The positive electrode of the first diode is connected to the first end of the secondary coil, the positive electrode of the second diode is connected to the second end of the secondary coil, the first end of the first resistor is connected to the midpoint of the secondary coil, and the negative electrodes of the first diode, the negative electrode of the second diode, and the second end of the first resistor are commonly connected to form the output end of the rectifying and filtering unit.

9. The low-voltage terminal of the wire harness according to claim 8, wherein The DC voltage stabilizing unit includes a first transistor, a second resistor, and a Zener diode; The input end of the first transistor is connected to the output end of the rectifying and filtering unit, the control end of the first transistor is connected to the negative electrode of the Zener diode, and the output end of the first transistor is connected to the positive power supply access end of the load; The positive electrode of the Zener diode is connected to the connection line between the output end of the rectifying and filtering unit and the negative power supply access end of the load. The first end of the second resistor is connected to the connection line between the first transistor and the rectifying and filtering unit, and the second end of the second resistor is connected to the connection line between the first transistor and the Zener diode.

10. An electrical device, characterized in that, The electrical device includes a low-voltage terminal of a wire harness as described in any one of claims 1 to 9.

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