PTC heater with improved EMC performance by a shield layer

Abstract

The utility model provides a PTC heater improves EMC performance through shielding layer ground connection, including PTC heater body and high pressure connector, low pressure connector, high pressure connector connects PTC heater body through high pressure wire harness, and low pressure connector connects PTC heater body through low pressure wire harness, and the high pressure wire harness includes copper wire layer, insulating layer, shielding layer and insulating rubber layer from inside to outside, and the shielding layer is connected with the whole car ground wire through the ground wire, the utility model discloses a third layer shielding layer of PTC heater high pressure wire harness is connected with the whole car ground wire, and the electromagnetic electricity that shielding layer absorbs is conducted to the whole car ground wire, thereby unloading electricity, thoroughly eliminates PTC to the radiation of whole car and the radiation influence of whole car to PTC, and wiring is simple and convenient, not only solves the electromagnetic interference problem of PTC high pressure wire harness to whole car, but also improves EMC performance, can be used on the PTC heater in new energy automobile air conditioning, and the scope of application is wide.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning control technology, and in particular to a PTC heater that improves EMC performance by grounding the shielding layer. Background Technology

[0002] As a vital modern mode of transportation, the comfort of the car's interior environment is of paramount importance, especially during cold seasons when the heating function of the car's air conditioning is indispensable. Currently, in new energy vehicles, whether small commuter cars or large luxury cars, PTC heaters are commonly used as the main heating equipment. PTC heaters can heat up rapidly after being powered on, with a fast thermal response speed, providing warm air to the car interior in a short time to meet passengers' needs for warmth and greatly improve riding comfort. However, because PTC heaters contain high-voltage wiring harnesses, which serve to protect the harness, isolate voltage, enhance insulation performance, and improve signal transmission quality, existing high-voltage wiring harness shielding layers lack external grounding wires, resulting in poor absorption and reflection of electromagnetic waves, i.e., weak electromagnetic interference and anti-interference capabilities, leading to the vehicle failing the national EMC standard test.

[0003] The utility model patent with announcement number CN221615172U provides a PTC heater assembly controller, a PTC heater assembly and a vehicle. The PTC heater is connected to the vehicle body ground through the shielding layer of the high voltage plug of the internal controller, which can play a certain role in preventing electromagnetic interference and improving the EMC characteristics of the circuit. However, it needs to be grounded through the controller, which is not only complex in structure, but also not very effective. Utility Model Content

[0004] The purpose of this invention is to provide a PTC heater that can improve EMC performance, eliminate the radiation from the PTC heater to the whole vehicle and the radiation effect of the whole vehicle on the PTC heater, so as to solve the electromagnetic interference problem of the PTC high-voltage wiring harness to the whole vehicle and overcome the shortcomings of the existing technology.

[0005] The technical solution adopted by this utility model to achieve the above-mentioned objective is: a PTC heater that improves EMC performance by grounding the shielding layer, comprising a PTC heater body, a high-voltage connector, and a low-voltage connector. The high-voltage connector is connected to the PTC heater body through a high-voltage wire harness, and the low-voltage connector is connected to the PTC heater body through a low-voltage wire harness. The high-voltage wire harness comprises, from the inside out, a copper wire layer, an insulation layer, a shielding layer, and an insulating rubber layer, and the shielding layer is grounded.

[0006] A further technical solution of this utility model is: the shielding layer is connected to the vehicle ground wire through a ground wire.

[0007] A further technical solution of this utility model is: a corrugated pipe is provided on the outside of the high-voltage wire harness.

[0008] A further technical solution of this utility model is: a heat shrink tubing is provided at the interface between the high-voltage wire harness and the PTC heater body.

[0009] A further technical solution of this utility model is: PVC sponge is provided on the corrugated pipe.

[0010] A further technical solution of this utility model is: the interface between the high-voltage connector and the high-voltage wiring harness is wrapped with waterproof tape.

[0011] Due to the adoption of the above technical solution, the PTC heater of this utility model, which improves EMC performance through grounding of the shielding layer, has the following beneficial effects: By connecting the third shielding layer of the high-voltage harness of the PTC heater to the vehicle ground wire, the electromagnetic energy absorbed by the shielding layer is conducted to the vehicle ground wire, thereby removing the electrical energy and completely eliminating the radiation of PTC to the vehicle and the radiation influence of the vehicle on PTC. The wiring is simple and convenient, and easy to implement. It not only solves the problem of electromagnetic interference of PTC high-voltage harness to the vehicle, but also improves EMC performance. The vehicle EMC national standard test meets the standard, and it can be used in the air conditioning of new energy vehicles, with a wide range of applications.

[0012] The technical features of a PTC heater that improves EMC performance through grounding of a shielding layer, as described below with reference to the accompanying drawings and embodiments, will be further explained. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the PTC assembly structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the high-voltage wiring harness of this utility model.

[0015] In the diagram: 1—PTC heater body, 2—high voltage connector, 3—low voltage connector, 4—high voltage wiring harness, 41—copper wire layer, 42—insulation layer, 43—shielding layer, 44—insulating rubber layer, 5—corrugated pipe, 6—heat shrink tubing, 7—PVC sponge, 8—waterproof tape. Detailed Implementation

[0016] Example

[0017] A PTC heater that improves EMC performance through grounding of the shielding layer, such as Figure 1As shown, the device includes a PTC heater body 1, a high-voltage connector 2, and a low-voltage connector 3. The high-voltage connector 2 is connected to the PTC heater body 1 via a high-voltage wiring harness 4, and the low-voltage connector 3 is connected to the PTC heater body 1 via a low-voltage wiring harness. The high-voltage wiring harness 4 mainly consists of four layers: a first copper wire layer 41 (conductive), an insulating layer 42, a shielding layer 43 (MCE shielding layer), and an outer insulating rubber layer 44. The shielding layer 43 is grounded, i.e., a ground wire is drawn from the PTC high-voltage line and connected to the vehicle ground wire. This conducts the electromagnetic waves absorbed by the shielding layer to the ground, dissipating electrical energy and completely eliminating the radiation from the PTC to the vehicle and the radiation influence from the vehicle to the PTC.

[0018] The high-voltage wiring harness 4 and the low-voltage wiring harness are provided with corrugated pipes 5. Heat shrink tubing 6 is provided at the interface between the high-voltage wiring harness 4, the low-voltage wiring harness and the PTC heater body 1. PVC sponge 7 is provided on the corrugated pipe 5. Waterproof tape 8 is wrapped at the interface between the high-voltage connector 2 and the high-voltage wiring harness 4.

[0019] The above embodiments are merely preferred embodiments of this utility model. The structure of this utility model is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A PTC heater with improved EMC performance through shielding grounding, comprising a PTC heater body (1), a high-voltage connector (2), and a low-voltage connector (3), wherein the high-voltage connector (2) is connected to the PTC heater body (1) via a high-voltage wiring harness (4), and the low-voltage connector (3) is connected to the PTC heater body (1) via a low-voltage wiring harness, characterized in that: The high-voltage wiring harness (4) includes, from the inside out, a copper wire layer (41), an insulation layer (42), a shielding layer (43), and an insulating rubber layer (44). The shielding layer (43) is grounded, that is, the shielding layer (43) is connected to the vehicle grounding wire through a ground wire.

2. A PTC heater for improving EMC performance through grounding of a shielding layer according to claim 1, characterized in that: The high-voltage harness (4) is provided with a corrugated pipe (5) on the outside.

3. A PTC heater for improving EMC performance through grounding of a shielding layer according to claim 2, characterized in that: A heat shrink tubing (6) is provided at the interface between the high-voltage wiring harness (4) and the PTC heater body (1).

4. A PTC heater for improving EMC performance through grounding of a shielding layer according to claim 2, characterized in that: The corrugated pipe (5) is provided with PVC sponge (7).

5. A PTC heater for improving EMC performance through grounding of a shielding layer according to claim 1, characterized in that: The interface between the high-voltage connector (2) and the high-voltage harness (4) is wrapped with waterproof tape (8).

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