Active thermal fuse control circuit in high-voltage electric heater

Abstract

The utility model discloses an active thermal fuse control circuit in a high-voltage electric heater, which comprises a high-voltage electric heating body and an IGBT (Insulated Gate Bipolar Translator) switch which are arranged in a high-voltage loop, and further comprises a thermal fuse arranged in the high-voltage loop, a shell is arranged on the outer wall of the thermal fuse, and an electric heating sheet is arranged in the shell; the electric heating sheet is a PTC (Positive Temperature Coefficient) heating resistor or an electric heating sheet made of a resistance wire material; high-voltage electric heaters in the market all utilize IGBTs as switching devices, and when the heaters break down, the IGBTs are turned off, and various protection functions are achieved. However, when an IGBT has a short-circuit fault, a controller of an assembly cannot cut off a high-voltage loop, a high-voltage electric heating body can continuously heat, and a serious thermal runaway potential safety hazard exists, according to the thermal fuse control circuit, the active thermal fuse module is installed in the circuit, the active thermal fuse module is arranged in the high-voltage loop, when the IGBT is short-circuited, an electric heating sheet is automatically started, and the thermal runaway of the high-voltage electric heating body is stopped. And the thermal fuse is fused, and a high-voltage loop in the assembly is cut off, so that thermal runaway is thoroughly avoided.

Description

Technical Field

[0001] The utility model relates to the field of new energy vehicles, and in particular to an active thermal fuse control circuit in a high-voltage electric heater. Background Art

[0002] New energy vehicles, especially electric vehicles, need to be equipped with water heaters in their thermal management systems to preheat the power batteries and heat the air conditioners. High-pressure liquid electric heaters are the core components of current thermal management systems.

[0003] The existing technology has the following problems:

[0004] Currently, high-voltage electric heaters on the market, such as PTC heaters, thick-film heaters, thin-film heaters, and electric heating tube heaters, all use IGBTs as switching devices. When the heater fails, the IGBT is shut off to implement various protection functions. However, when the IGBT short-circuits, the assembly controller cannot disconnect the high-voltage circuit, and the high-voltage electric heater will continue to heat uncontrollably, posing a serious safety hazard of thermal runaway. Utility Model Content

[0005] In view of the problems in the related art, the present invention proposes an active thermal fuse control circuit in a high-voltage electric heater to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows: an active thermal fuse control circuit in a high-voltage electric heater, comprising a high-voltage electric heating element and an IGBT switch arranged in a high-voltage circuit, and also comprising a thermal fuse arranged in the high-voltage circuit, wherein the outer wall of the thermal fuse is provided with a shell, and the interior of the shell is provided with an electric heating plate;

[0007] The electric heating plate is a PTC heating resistor or a resistance wire material electric heating plate.

[0008] Preferably, the shell is an insulating and heat-resistant shell.

[0009] Preferably, a resistance heating plate active control module is provided inside the electric heating plate.

[0010] 1. The beneficial effects of the present invention are as follows: the active thermal fuse control circuit in the high-voltage electric heater, by installing the active thermal fuse module in the circuit and setting the active thermal fuse module in the high-voltage circuit, automatically opens the electric heating plate and melts the thermal fuse when the IGBT is short-circuited, cutting off the high-voltage circuit inside the assembly, thereby completely avoiding the safety hazard of thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 This is a schematic diagram of the circuit structure of the thermal fuse of the utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the thermal fuse of the utility model (1);

[0014] Figure 3 This is a schematic diagram of the structure of the thermal fuse of the utility model (II);

[0015] In the figure: 1. Housing; 2. Thermal fuse; 3. Heating element. DETAILED DESCRIPTION

[0016] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0017] According to an embodiment of the present utility model, an active thermal fuse control circuit in a high-voltage electric heater is provided.

[0018] Embodiment 1;

[0019] like Figure 1-Figure 3 As shown, the active thermal fuse control circuit in the high-voltage electric heater according to the embodiment of the utility model includes a high-voltage electric heating element and an IGBT switch arranged in the high-voltage circuit, and also includes a thermal fuse 2 arranged in the high-voltage circuit, the outer wall of the thermal fuse 2 is provided with a shell 1, and the interior of the shell 1 is provided with an electric heating plate 3;

[0020] The electric heating plate 3 is a PTC heating resistor or a resistance wire material electric heating plate.

[0021] Preferably, the housing 1 is an insulating and temperature-resistant housing.

[0022] Preferably, a resistance heating plate active control module is provided inside the electric heating plate 3 .

[0023] In this embodiment, by installing the active thermal fuse module in the circuit and setting the active thermal fuse module in the high-voltage circuit, when the IGBT is short-circuited, the electric heating plate is automatically turned on, the thermal fuse is melted, and the high-voltage circuit inside the assembly is cut off, thereby completely avoiding the safety hazard of thermal runaway.

[0024] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process is described in detail below.

[0025] In actual application, the active thermal fuse module is installed in the circuit. The control circuit principle is: an active thermal fuse module is set in the high-voltage circuit. When the IGBT is short-circuited, the electric heating plate is automatically turned on, the thermal fuse is melted, and the high-voltage circuit inside the assembly is cut off, thereby completely avoiding the safety hazard of thermal runaway.

[0026] In summary, with the help of the above-mentioned technical solution of the present invention, by installing the active thermal fuse module in the circuit and setting the active thermal fuse module in the high-voltage circuit, when the IGBT is short-circuited, the electric heating plate is automatically turned on, the thermal fuse is melted, and the high-voltage circuit inside the assembly is cut off, thereby completely avoiding the safety hazard of thermal runaway.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An active thermal fuse control circuit in a high-voltage electric heater, comprising a high-voltage electric heating element and an IGBT switch arranged in a high-voltage circuit, characterized in that: It also includes a thermal fuse (2) arranged in a high-voltage circuit, wherein the outer wall of the thermal fuse (2) is provided with a shell (1), and the interior of the shell (1) is provided with an electric heating plate (3); The electric heating plate (3) is a PTC heating resistor or a resistance wire material electric heating plate.

2. The active thermal fuse control circuit in a high-voltage electric heater according to claim 1, characterized in that: The housing (1) is an insulating and temperature-resistant housing.

3. The active thermal fuse control circuit in a high-voltage electric heater according to claim 1, characterized in that: A resistance heating plate active control module is provided inside the electric heating plate (3).

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