Multi-zone PTC heater

Abstract

The utility model discloses a multi-zone PTC heater. The multi-zone PTC heater comprises a heating core body, a controller, a control box and a high-voltage connector, the heating core body can be divided into first to fourth heating core body subareas based on the distribution of automobile seats and comprises a plurality of heating rods, and each heating rod is divided into a first heating rod subarea and a second heating rod subarea which can be independently controlled by a controller to heat; the control box is arranged at the end, close to the first heating core subarea and the third heating core subarea, of the heating core. The high-voltage connector is arranged on the side face of the control box, and a preset acute angle is formed between the opening direction of the high-voltage connector and the vertical line direction of the maximum contour face of the heating rods, so that the high-voltage connector does not interfere with an automobile chassis, an air conditioner air duct and parts installed on the air conditioner air duct. Each heating rod can be divided into two sections to independently control heating, and therefore the purpose that one multi-area type heater is applied to multiple vehicle types is achieved. Due to the position arrangement of the high-voltage connector, the heater has a smaller size while high-voltage and low-voltage isolation is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of PTC heaters, and more specifically, to a multi-zone PTC heater. Background Art

[0002] New energy vehicles are the future direction of global automobile development. Due to the difference in power systems, traditional heating methods are not suitable for new energy vehicles. The electric heating function of PTC ceramics just meets this need, so it is widely used in new energy vehicles. As a positive temperature coefficient semiconductor material, PTC can generate heat by itself when powered on, and can adaptively adjust the heating power according to the ambient temperature without overheating. It has the advantages of constant temperature, no open flame, safety and environmental protection.

[0003] Due to the need to save energy, new energy vehicle models have the requirement that the air conditioner provide different heating values ​​for the driver's seat, front passenger seat, rear seat and other areas. However, there is currently no heater in the existing technology that can adapt to the heating needs of various vehicle models. Utility Model Content

[0004] In response to at least one defect or improvement need in the prior art, the present application provides a multi-zone PTC heater, which is used to at least solve the technical problem that there is currently no heater in the prior art that can adapt to the heating needs of various vehicle models.

[0005] To achieve the above-mentioned purpose, the present application provides a multi-zone PTC heater, comprising: a heating core, a controller, a control box and a high-voltage connector;

[0006] The heating core can be divided into a first heating core partition, a second heating core partition, a third heating core partition and a fourth heating core partition corresponding to the main driving seat area, the co-pilot seat area, the area directly behind the main driving seat and the area directly behind the co-pilot seat; the heating core includes a plurality of heating rods; each of the heating rods includes a PTC heating chip, a partition electrode and a common electrode, and is respectively divided into a first heating rod partition and a second heating rod partition, and the two heating rod partitions of one heating rod belong to different heating core partitions, and each heating rod partition can be independently controlled by the controller to be heated separately;

[0007] The controller is arranged in the control box and is used to control each heating core partition and / or each heating rod partition to perform independent heating;

[0008] The control box is arranged at the end of the heating core close to the first heating core partition and the third heating core partition;

[0009] The high-voltage connector is used to connect the power supply and is arranged on the side of the control box close to the third heating core partition. Its opening direction forms a preset acute angle with the perpendicular direction of the maximum contour surface of the plurality of heating rods so as not to interfere with the automobile chassis, the air-conditioning duct and the components installed on the air-conditioning duct.

[0010] Furthermore, the preset acute angle ranges from 15 to 20 degrees.

[0011] Furthermore, it also includes a common terminal busbar, a common terminal electrode, a partition busbar and a partition adapter;

[0012] The common electrode of each heating rod is connected to the common terminal busbar by welding or clamping, and the common terminal busbar is connected to the controller via the common terminal electrode;

[0013] The partition electrode of each heating rod is connected to the partition busbar by welding or clamping, and the partition busbar is connected to the controller via the partition adapter.

[0014] Further, the controller includes a first IGBT circuit, a second IGBT circuit, a third IGBT circuit and a fourth IGBT circuit;

[0015] The first to fourth IGBT circuits are respectively connected to and control the first to fourth heating core partitions through the corresponding adapter ends of the partition adapter, so as to achieve independent control of heating of each heating core partition.

[0016] Furthermore, the controller controls the heating switch and / or heating power of each heating core partition by adjusting the duty cycle of the IGBT.

[0017] Furthermore, it also includes a low-voltage connector disposed on the side of the control box;

[0018] The low voltage connector is used to feed back the working status information of the first to fourth heating core partitions to the controller.

[0019] Further, it also includes: at least one insulating ceramic plate;

[0020] The insulating ceramic plate is used to place the first to fourth IGBT circuits to insulate and isolate each IGBT circuit;

[0021] An insulating glaze layer is provided on the side surface between the two electrode surfaces of each insulating ceramic plate.

[0022] Furthermore, it also includes: a heating core shell and a sealing rubber plug;

[0023] The heating core is fixed in the heating core shell;

[0024] The heating core shell and the control box are connected by screws, and the sealing plug is used to fill the gap at the connection position and is sealed with silica gel.

[0025] Furthermore, it also includes: a breathable valve;

[0026] The air-permeable valve is installed on the control box, is air-permeable and water-tight, and achieves the function of balancing the internal and external air pressures.

[0027] Further, it also includes: an insulating partition;

[0028] The insulating partition is arranged between the common terminal busbar and the partition busbar to insulate and isolate the two busbars.

[0029] In general, the above technical solutions conceived by the present application can achieve the following beneficial effects compared with the prior art:

[0030] (1) The heating core of the present application can be composed of a number of heating rods, each of which has the function of independently heating two partitions, so that the heater can be composed of two partitions of the heating rod and a different number of heating rods, and the function of heating multiple partitions separately can be realized at the heating core level. The technical problem of multi-zone heating of new energy vehicles is solved by independently controlling different areas of the heating core, and a multi-zone PTC heater product can be applied to multiple vehicle models, thereby reducing development costs, inventory costs and after-sales replacement pressure. The present application directly offsets the high-voltage connector out of the air-conditioning duct and arranges it diagonally, avoiding the multi-zone high-voltage wiring harness passing through the servo motor position of the air conditioner, and there is no need to use a switching structure or elbow connector, thereby ensuring that the PTC heater has a smaller size while ensuring high and low voltage isolation.

[0031] (2) The present application glazes the sides between the two electrode surfaces of the insulating ceramic plate to form an insulating glaze layer, thereby eliminating the occurrence of side creepage failures, allowing the insulating ceramic plate and the heater to carry a higher voltage at the same volume. The heater product can work stably at a voltage of up to 1200V, covering the voltage requirements of the 800V high-voltage fast charging platform.

[0032] (3) The partition circuit and control circuit of the present application can realize the partition heating function in a sealed housing. Compared with the heater in which multiple heating modules are assembled together, the structure of the heater of the present application is lighter and the cost of achieving IP67 protection level is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the heating core partition provided in the embodiment of the present application;

[0035] Figure 2 An exploded view of the structure of a multi-zone PTC heater provided in an embodiment of the present application;

[0036] Figure 3 A left view of a multi-zone PTC heater provided in an embodiment of the present application;

[0037] Figure 4 A right side view of a multi-zone PTC heater provided in an embodiment of the present application;

[0038] Figure 5 A three-dimensional schematic diagram of the application state of the multi-zone PTC heater provided in an embodiment of the present application;

[0039] Figure 6 A schematic top view of the application state of the multi-zone PTC heater provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of the structure of the insulating ceramic plate provided in an embodiment of the present application;

[0041] Reference numerals:

[0042] 1. Heating core; 2. Radiator; 3. Heating rod; 4. Sealing plug; 5. Common terminal busbar; 6. Insulating partition; 7. Common terminal electrode; 8. Partition busbar; 9. Partition adapter; 10. Controller PCBA; 11. Upper cover; 12. Label; 13. Breathing valve; 14. Grounding harness; 15. Low voltage connector; 16. High voltage connector; 17. IGBT pressure plate; 18. Insulating ceramic plate; 19. Control box; 20. Left shell; 21. Right shell; 22. First heating core partition (corresponding to heating the main driving seat area of ​​the car); 23. Second heating Core partition (corresponding to heating the area of ​​the co-pilot seat of the car); 24. The third heating core partition (corresponding to heating the area directly behind the main driver's seat of the car); 25. The fourth heating core partition (corresponding to heating the area directly behind the co-pilot seat of the car); 26. Air conditioning duct; 27. Air conditioning internal cooling; 28. The first servo motor; 29. ​​The second servo motor; 30. The third servo motor; 31. The passenger cabin; 32. The chassis of the car; 33. The vertical direction of the maximum contour surface of several heating rods; 34. The opening direction of the high-voltage connector; 35. The electrode surface of the insulating ceramic plate; 36. The insulating glaze layer. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] The terms "first", "second" or "third" in the specification, claims or the above-mentioned drawings of the present application are used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In addition, the terms "including" or "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices. The orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and / or "outside" is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0045] Due to the need to save energy, new energy vehicles have the requirement to provide different heating values ​​for the air conditioner corresponding to the driver's seat, co-driver's seat, rear seat and other areas. However, there is no heater in the prior art that can adapt to the heating needs of various models. In view of this technical status, the purpose of this application is to achieve multi-zone heating for new energy vehicles. A new energy vehicle air-conditioning PTC heater is proposed, which can control the heating power and perform shutdown protection, and realize the zone heating function by independently controlling different areas of the heating core, thereby realizing a multi-zone PTC heater product that can be applied to multiple models, thereby reducing development costs, inventory costs and after-sales replacement pressure.

[0046] In a specific embodiment, the present application provides a new energy vehicle air conditioner PTC heater, which may include the following components as a whole: a heating core 1, a common end busbar 5, an insulating partition 6, a common end electrode 7, a partition busbar 8, a partition adapter 9, a controller PCBA (short for Printed Circuit Board Assembly, that is, the entire process of a PCB blank board after SMT mounting or DIP plug-in, referred to as PCBA. This is a commonly used writing method in China, while the standard writing method in Europe and the United States is PCB'A, with "'" added, which is called the official idiom. PCBA refers to a product in which electronic components (such as resistors, capacitors, inductors and ICs, etc.) are fixed on a PCB (Printed Circuit Board) by welding or plugging. PCB is the basis of PCBA. It is an insulating substrate used for electrical connection between electronic components. Through pre-designed circuit patterns and hole positions, the connection between components becomes simple and convenient.) 10. IGBT (Insulated Gate Bipolar Transistor, or insulated gate bipolar transistor, is a composite fully controlled voltage-driven power semiconductor device. It is a representative product of the third technological revolution of power electronics recognized by the world and a core component in the field of industrial control and automation. IGBT has appeared in the 1980s and has undergone 7 iterations and upgrades since its development. IGBT has excellent properties such as high frequency, high voltage, large current and easy switching. Its main function is to convert AC and DC and convert high and low voltage. It is regarded as the "CPU" in the electric control system. In simple terms, IGBT can adjust the voltage, current, frequency and phase in the circuit according to signal instructions, just like a "switch" to achieve precise control. ) Press plate 17, insulating ceramic plate 18, sealing plug 4, left shell 20, right shell 21, control box 19, upper cover 11, high-voltage connector 16, low-voltage connector 15, grounding harness 14, breathable valve 13 and label 12.

[0047] refer to Figure 1The heating core 1 includes a first heating core partition 22, a second heating core partition 23, a third heating core partition 24 and a fourth heating core partition 25, which respectively correspond to the main driving seat area, the co-pilot seat area, the area directly behind the main driving seat and the area directly behind the co-pilot seat; each heating core partition can be independently controlled by the controller PCBA10 and heated separately. Specifically, the overall outer contour of the heating core 1 is a structure that is approximately or equal to a rectangular parallelepiped. The rectangular parallelepiped is flat as a whole. The heating core 1 of the rectangular parallelepiped structure is divided into 4 rectangular parallelepiped areas by cross lines. The heating components of each rectangular parallelepiped area correspond to the four seats in the interior of a conventional new energy vehicle (the middle seat in the back row of a 5-seater car is not considered for the time being, and the entire back row seat is simplified and divided into two parts), and the space of the corresponding seat area is heated.

[0048] The heating core 1 can be a whole plate-shaped heating plate structure, or it can be composed of a plurality of heating rods laid flat, as long as the above-mentioned four partitions can be independently heated. More specifically, the heating core 1 of this embodiment uses a plurality of heating rods 3 and the radiator 2 to be assembled together in an alternating manner. Figure 2 Each heating rod 3 may include a PTC heating chip, three electrodes and an insulating material. The three electrodes include two partition electrodes and one common electrode, so that two independent heating partitions of the upper and lower parts of a single heating rod 3 can be realized, and the heater can be composed of two partitions of the heating rod 3 and different numbers of heating rods 3, so as to realize the function of heating multiple partitions separately at the level of the heating core 1 (for example: Figure 1 The upper heating areas of the heating rods on the left side of the middle constitute the third heating core partition 24, and the composition of other heating core partitions can be deduced by analogy).

[0049] When the heater receives a four-zone power partition request, that is, when obtaining the vehicle model demand request for the main driver's seat area, the co-driver's seat area, the area directly behind the main driver's seat and the area directly behind the co-driver's seat, the four IGBT circuits (reference Figure 2 The four small block components at the lower end of the middle controller PCBA10 respectively control the independent heating of the four partitions of the heating core 1 (i.e., the first heating core partition 22, the second heating core partition 23, the third heating core partition 24 and the fourth heating core partition 25), and receive the feedback of the working status information of the four partitions.

[0050] When the heater receives a three-zone power partitioning request, that is, a vehicle model requirement request that the main driver's seat area and the co-driver's seat area of ​​the car are controlled separately, and the area directly behind the main driver's seat of the car and the area directly behind the co-driver's seat of the car do not need to be controlled separately, the controller PCBA10 merges the two rear partitions of the car (the area directly behind the main driver's seat of the car and the area directly behind the co-driver's seat of the car) into a first whole zone (the first whole zone includes the third heating core partition 24 and the fourth heating core partition 25), and on the premise of ensuring that the total heating power required for the two rear partitions is the same as the vehicle's required power, the power is equally divided between the two rear partitions, and the working status of the three partitions (i.e., the first heating core partition 22, the second heating core partition 23 and the aforementioned merged first whole zone) is received.

[0051] When the heater receives a power partition request for the second zone, that is, when it obtains a vehicle demand request that the area directly behind the main driver's seat and the area directly behind the co-driver's seat of the car do not require heating, the controller PCBA10 merges the area directly behind the main driver's seat of the car and the area directly behind the main driver's seat of the car into a second whole zone, and distributes the heating power in proportion to ensure consistent temperature uniformity. The area directly behind the co-driver's seat of the car and the area directly behind the co-driver's seat of the car are merged into a third whole zone, and the heating power is distributed in proportion to ensure consistent temperature uniformity. And receive the working status of the two partitions (the aforementioned merged second whole zone and third whole zone) fed back.

[0052] The above partitioning strategy is a built-in strategy for the PTC heater product, and there is no need to obtain new applications from the vehicle side or external devices to upgrade. Different numbers of partition requests mainly refer to the application of the PTC heater product to different models, with the design goal of the same PTC heater meeting the requirements of multiple platforms and models, rather than just changing the number of partitions on the same model. In fact, the product is applied to the same model, and it is also possible to change the combination of heating zones according to the needs of the passengers, but the technical problem that this application focuses on solving is how to achieve a heater product that can be applied to multiple models, thereby reducing development costs, inventory costs and after-sales replacement pressure.

[0053] The heating core 1 is connected to the controller PCBA10 through a partition circuit composed of a common end busbar 5, an insulating partition 6, a common end electrode 7, a partition busbar 8, and a partition adapter 9. The controller PCBA10 controls the heating switch and heating power of each zone through the IGBT duty cycle (IGBT duty cycle refers to the percentage of the IGBT switch that is in the on state within a certain period of time. When controlling the IGBT drive circuit, it is necessary to control the on and off of the IGBT by adjusting the duty cycle, thereby controlling the output power of the entire circuit. The size of the IGBT duty cycle is directly related to the output power, and its size is determined by the control signal. The waveform and frequency of the control signal will affect the on and off speed of the IGBT.) The control area can be freely combined according to the requirements of different models for control signals. The PTC heater product of the present application uses four IGBT circuits, which correspond to the four areas of the heating core 1 (i.e., the first heating core partition 22, the second heating core partition 23, the third heating core partition 24 and the fourth heating core partition 25) through the partition adapter 9. They can be controlled independently or jointly as needed.

[0054] Specifically, the common electrode of each heating rod 3 is connected to the common terminal busbar 5 by welding or clamping, and the common terminal busbar 5 is connected to the controller PCBA10 through the common terminal electrode 7. The controller PCBA10 transfers the common terminal electrode 7 to the positive pole of the input power supply.

[0055] Specifically, the partition electrodes of each heating rod 3 are connected to the partition busbar 8 by welding or clamping, and the partition busbar 8 is then connected to the controller PCBA10 through the partition adapter 9. The four IGBT circuits on the controller PCBA10 are located between the partition adapter 9 and the negative pole of the input power supply. The controller PCBA10 controls the heating power by adjusting the duty cycle of the IGBT. More specifically, the four IGBT circuits at the lower end of the aforementioned controller PCBA10 are respectively connected to and control the first to fourth heating core partitions through the corresponding adapter ends of the partition adapter 9, so as to realize independent control of heating of each heating core partition.

[0056] The dustproof and waterproof functions are achieved thanks to the fact that the high-voltage circuit is completely encapsulated in the control box 19 and the heating rod 3. The heating core 1 is fixed in the main housing surrounded by the left housing 20 and the right housing 21, and the controller PCBA 10 is installed in the control box 19; the main housing and the control box 19 are connected by screws, refer to Figure 3 and Figure 4 .

[0057] The heating rod 3 is away from the side of the controller PCBA10, and the inside of the heating rod 3 is sealed by filling liquid silicone. The heating rod 3 is located on one side of the controller PCBA10, and the heating rod 3 extends into the control box 19. The gap between the heating core 1 and the control box 19 is filled with a sealing plug 4 and sealed with silicone. The position where the control box 19 and the upper cover 11 are installed is provided with a dispensing groove, and the sealing of the control box 19 and the upper cover 11 is achieved by filling silicone in the dispensing groove. The position where the high-voltage connector 16 and the low-voltage connector 15 are installed on the control box 19, when the high-voltage connector 16 and the low-voltage connector 15 are fixed to the control box 19 with screws, the sealing rubber rings on the flange surfaces of the high-voltage connector 16 and the low-voltage connector 15 are sealed by the interference fit of the control box 19. The controller PCBA10 obtains power through the high-voltage connector 16, and reports and feedbacks the working status information through the low-voltage connector 15 to realize the function of controlling the heating power of the heating core 1.

[0058] Car air conditioners with multi-zone heating functions generally require multiple servo motors (reference Figure 5 and Figure 6 , the first servo motor 28, the second servo motor 29 and the third servo motor 30, etc.) are installed on the outside of the air conditioning duct 26 to control the damper. The servo motors are all low-voltage products below 24V and need to be spatially isolated from the high-voltage wiring harness. Therefore, the high-voltage connector is subject to the following restrictions:

[0059] (1) The high voltage connector 16 cannot face the direction of the servo motor, i.e. Figure 6 Shown above, towards the passenger compartment and towards the vehicle chassis.

[0060] (2) The high-voltage connector 16 cannot interfere with the vehicle chassis 32 and the air conditioning duct 26 and any parts installed on the air conditioning duct 26 (such as the air conditioning inner cooler 27).

[0061] In this way, the high-voltage connector 16 cannot be set to directly extend from above the width of the air conditioning duct 26. However, if the high-voltage wiring harness is directly arranged perpendicular to the air conditioning duct 26, it will interfere with the space of the vehicle chassis 32 and the frame (i.e., the passenger cabin 31). Therefore, related products in the prior art generally use adapters or elbow connectors to circumvent this technical problem, but this will inevitably increase the heater space and manufacturing costs. This embodiment deliberately offsets the high-voltage connector 16 at an acute angle of 15-20° from the air conditioning duct (reference Figure 5 and Figure 6 The angle θ is the angle between the opening direction 34 of the high voltage connector and the perpendicular direction 33 of the maximum contour surface of the plurality of heating rods; the perpendicular direction of the maximum contour surface of the plurality of heating rods is Figure 1In the direction perpendicular to the paper, the opening direction 34 of the high-voltage connector is obviously offset from the vertical direction by a certain acute angle. Figure 1 , Figure 5 and Figure 6 ) extends to the power source away from the air conditioning duct 26 so as not to interfere with the vehicle chassis 32, the air conditioning duct 26 and the components installed on the air conditioning duct 26. This avoids the use of a transfer structure or an elbow connector, thereby ensuring that the PTC heater has a smaller size while ensuring the safety of high and low voltage isolation, and also reduces manufacturing costs.

[0062] The insulating ceramic plate 18 is used to place the first to fourth IGBT circuits to insulate and isolate each IGBT circuit. Figure 2 Two IGBT circuits are arranged on each insulating ceramic plate 18, and the four surfaces and fillets between the two electrode surfaces 35 of the insulating ceramic plate are glazed, that is, an insulating glaze layer 36 is formed on the entire side thereof, referring to Figure 7 In this way, the side creepage fault can be eliminated, and the PTC insulating ceramic plate and heater can carry a higher voltage in the same volume. The heater product can work stably at a voltage of up to 1200V, covering the voltage requirement of the 800V high-voltage fast charging platform.

[0063] The air-permeable valve 13 is installed on the control box 19, which is air-permeable but not water-permeable, and achieves the function of balancing the internal and external air pressure, so that the PTC heater product can reach the IP67 protection level. The partition circuit and control circuit of the present application can realize the function of partition heating control in a sealed shell. Compared with the heater in which multiple heating modules are assembled together, the structure of the PTC heater product of the present application is lighter and the cost of achieving the IP67 protection level is lower.

[0064] Those skilled in the art will appreciate that the technical features described in the various embodiments and / or claims of the present application may be combined and / or coupled in a variety of ways, even if such combinations and / or couplings are not explicitly described in the present application. In particular, without departing from the spirit and teachings of the present application, the technical features described in the various embodiments and / or claims of the present application may be combined and / or coupled in a variety of ways, and all of these combinations and / or couplings fall within the scope of the present application.

[0065] Although the present application has been shown and described with reference to specific exemplary embodiments of the present application, it should be understood by those skilled in the art that various changes in form and details may be made to the present application without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents. Therefore, the scope of the present application should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A multi-zone PTC heater, characterized in that: include: Heating core, controller, control box and high voltage connector; The heating core can be divided into a first heating core partition, a second heating core partition, a third heating core partition and a fourth heating core partition corresponding to the main driving seat area, the co-pilot seat area, the area directly behind the main driving seat and the area directly behind the co-pilot seat; the heating core includes a plurality of heating rods; each of the heating rods includes a PTC heating chip, a partition electrode and a common electrode, and is respectively divided into a first heating rod partition and a second heating rod partition, and the two heating rod partitions of one heating rod belong to different heating core partitions, and each heating rod partition can be independently controlled by the controller to be heated separately; The controller is arranged in the control box and is used to control each heating core partition and / or each heating rod partition to perform independent heating; The control box is arranged at the end of the heating core close to the first heating core partition and the third heating core partition; The high-voltage connector is used to connect the power supply and is arranged on the side of the control box close to the third heating core partition. Its opening direction forms a preset acute angle with the perpendicular direction of the maximum contour surface of the plurality of heating rods so as not to interfere with the automobile chassis, the air-conditioning duct and the components installed on the air-conditioning duct.

2. The multi-zone PTC heater according to claim 1, characterized in that: The preset acute angle ranges from 15 to 20 degrees.

3. The multi-zone PTC heater according to claim 1 or 2, characterized in that: It also includes a common terminal busbar, a common terminal electrode, a partition busbar and a partition adapter; The common electrode of each heating rod is connected to the common terminal busbar by welding or clamping, and the common terminal busbar is connected to the controller via the common terminal electrode; The partition electrode of each heating rod is connected to the partition busbar by welding or clamping, and the partition busbar is connected to the controller via the partition adapter.

4. The multi-zone PTC heater according to claim 3, characterized in that: The controller includes a first IGBT circuit, a second IGBT circuit, a third IGBT circuit and a fourth IGBT circuit; The first to fourth IGBT circuits are respectively connected to and control the first to fourth heating core partitions through the corresponding adapter ends of the partition adapter, so as to achieve independent control of heating of each heating core partition.

5. The multi-zone PTC heater according to claim 4, characterized in that: The controller controls the heating switch and / or heating power of each heating core partition by adjusting the duty cycle of the IGBT.

6. The multi-zone PTC heater according to claim 4, characterized in that: Also included is a low-voltage connector disposed on the side of the control box; The low voltage connector is used to feed back the working status information of the first to fourth heating core partitions to the controller.

7. The multi-zone PTC heater according to claim 4, characterized in that: Also includes: at least one insulating ceramic plate; The insulating ceramic plate is used to place the first to fourth IGBT circuits to insulate and isolate each IGBT circuit; An insulating glaze layer is provided on the side surface between the two electrode surfaces of each insulating ceramic plate.

8. The multi-zone PTC heater according to any one of claims 4 to 7, characterized in that: Also includes: Heating core shell and sealing rubber plug; The heating core is fixed in the heating core shell; The heating core shell and the control box are connected by screws, and the sealing plug is used to fill the gap at the connection position and is sealed with silica gel.

9. The multi-zone PTC heater according to any one of claims 4 to 7, characterized in that: Also includes: Breathing valve; The air-permeable valve is installed on the control box, is air-permeable and water-tight, and achieves the function of balancing the internal and external air pressures.

10. The multi-zone PTC heater according to any one of claims 4 to 7, characterized in that: Also included: an insulating partition; The insulating partition is arranged between the common terminal busbar and the partition busbar to insulate and isolate the two busbars.

Images