Thermal management circuit of converter, temperature control method, controller and system

Abstract

The invention relates to a thermal management circuit, a temperature control method, a controller and a system of a converter, and the thermal management circuit comprises a heating module, a thermal management execution module, a temperature collection module and a power supply interlocking management module. The power supply interlocking management module is connected with an external auxiliary power supply, a first vehicle-mounted auxiliary power supply, a heating module, a heat management execution module and a temperature acquisition module, and when the real-time temperature, acquired by the temperature acquisition module, of the converter reaches a preset temperature, the power supply interlocking management module cuts off a first power supply path and establishes a second power supply path; safe switching from a preheating mode to a normal operation mode can be achieved, the risk that a converter is overheated due to misoperation of a heating circuit can be fundamentally eradicated through forced management and isolation of power supply paths of the two modes, and meanwhile the heating function, the heat dissipation function and the temperature control function are deeply integrated, so that the safety of the converter is improved. And the reliability and the safety of the system can be obviously improved.

Description

Technical Field

[0001] This application belongs to the field of converter thermal management technology, and in particular relates to converter thermal management circuits, temperature control methods, controllers and systems. Background Technology

[0002] As a core component of power conversion, converters are widely used in industrial fields such as rail transit and new energy. With the development of rail transit technology, locomotives face increasingly diverse application environments, especially in some extreme regions where the ambient temperature may be extremely low (such as below -40℃).

[0003] Under such extreme low-temperature conditions, the internal components of the converter cannot start normally and must rely on an additional preheating system. Existing technology usually uses an independent heating circuit to preheat the converter. However, this independent heating circuit only solves the problem of low-temperature start-up, but brings new safety hazards: there is a lack of coordination between the heating circuit and the thermal management system during normal operation of the converter. There is a risk that the heating circuit will still be in operation when the equipment is working normally, which may lead to overheating and damage to the converter. Summary of the Invention

[0004] The purpose of this application is to provide a thermal management circuit, temperature control method, controller, and system for a converter. The thermal management circuit, temperature control method, controller, and system for a converter provided by this application can achieve safe switching from preheating mode to normal operation mode. This forced management and isolation of the power supply paths of the two modes can fundamentally eliminate the risk of converter overheating due to malfunction of the heating circuit. At the same time, by deeply integrating heating, heat dissipation, and temperature control functions, the reliability and safety of the system can be significantly improved. The technical solution provided in this application is as follows: A thermal management circuit for a converter includes: a heating module, a thermal management execution module, a temperature acquisition module, and a power interlock management module; The power interlock management module is connected to the external auxiliary power supply, the first vehicle auxiliary power supply, the heating module, the thermal management execution module and the temperature acquisition module respectively. The power interlock management module is used for: In preheating mode, a first power supply path is established so that the external auxiliary power supply supplies power to the heating module so that the heating module heats the converter; When the real-time temperature of the converter acquired by the temperature acquisition module reaches the preset temperature, a second power supply path is established so that the first vehicle auxiliary power supply supplies power to the thermal management execution module, and the first power supply path is cut off.

[0005] Optionally, The power interlock management module is also used to establish a power supply connection for the thermal management execution module in the preheating mode, so that the external auxiliary power supply simultaneously supplies power to the heating module and the thermal management execution module, so that the thermal management execution module cyclically disturbs the heat generated by the heating module.

[0006] Optionally, the power interlock management module is connected to the second vehicle auxiliary power supply; The power interlock management module is also used to establish a power supply connection for the temperature acquisition module in the preheating mode, so that the second vehicle auxiliary power supply supplies power to the temperature acquisition module.

[0007] Optionally, the power interlock management module includes a first power on / off unit, a second power on / off unit, a first controlled unit, and a second controlled unit; The first end of the main contact of the first controlled unit is connected to the first vehicle auxiliary power supply; The first end of the main contact of the first power switching unit is connected to the second end of the main contact of the first controlled unit and the external auxiliary power supply, respectively. The second end of the main contact of the first power on / off unit is connected to the thermal management execution module; The external auxiliary power supply is connected to the heating module through the main contacts of the second controlled unit and the main contacts of the second power on / off unit; The second vehicle auxiliary power supply is connected to the temperature acquisition module through the coil of the second controlled unit, the interlocking contact of the first power on / off unit, the interlocking contact of the second power on / off unit, and the interlocking contact of the first controlled unit.

[0008] Optionally, the first controlled unit and / or the second controlled unit may be an electromagnetic contactor or an electromagnetic relay.

[0009] Optionally, the first power switching unit and the second power switching unit are manual circuit breakers.

[0010] Optionally, the interlocking contacts of the first power switching unit and the second power switching unit are normally open contacts, and the interlocking contacts of the first controlled unit are normally closed contacts.

[0011] This application also provides a temperature control method for a converter, executed by a temperature controller connected to the thermal management circuit described above, the method comprising: In preheating mode, the power interlock management module is controlled to establish a first power supply path so that the external auxiliary power supply supplies power to the heating module so that the heating module heats the converter; The real-time temperature of the converter is acquired by the temperature acquisition module. When the real-time temperature reaches a preset temperature, the power interlock management module is controlled to establish a second power supply path so that the first vehicle auxiliary power supply supplies power to the thermal management execution module, and the first power supply path is cut off.

[0012] This application also provides a temperature controller for a converter, the temperature controller being connected to the thermal management circuit as described above, the controller comprising: The first control module is used to control the power interlock management module to establish a first power supply path in the preheating mode, so that the external auxiliary power supply supplies power to the heating module, so that the heating module heats the converter. The second control module is used to acquire the real-time temperature of the converter collected by the temperature acquisition module. When the real-time temperature reaches the preset temperature, the control module controls the power interlock management module to establish a second power supply path so that the first vehicle auxiliary power supply supplies power to the thermal management execution module and cuts off the first power supply path.

[0013] This application also provides a temperature control system for a converter, including a temperature controller as described above and a thermal management circuit as described in any of the above claims. The temperature controller is connected to the temperature acquisition module and the power interlock management module in the thermal management circuit.

[0014] Compared with existing technologies, this application provides a thermal management circuit, temperature control method, controller, and system for a converter. The thermal management circuit includes a heating module, a thermal management execution module, a temperature acquisition module, and a power interlock management module. The power interlock management module is connected to an external auxiliary power supply, a first on-board auxiliary power supply, the heating module, the thermal management execution module, and the temperature acquisition module. The power interlock management module is used to: establish a first power supply path in preheating mode so that the external auxiliary power supply supplies power to the heating module, thereby enabling the heating module to heat the converter; and when the real-time temperature of the converter acquired by the temperature acquisition module reaches a preset temperature... In this application, when the real-time temperature of the converter collected by the temperature acquisition module reaches the preset temperature, the first power supply path is cut off and the second power supply path is established through the power interlock management module. This enables a safe switching from the preheating mode to the normal operation mode. This forced management and isolation of the power supply paths of the two modes can fundamentally eliminate the risk of converter overheating due to malfunction of the heating circuit. At the same time, by deeply integrating heating, heat dissipation and temperature control functions, the reliability and safety of the system can be significantly improved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the thermal management circuit of a converter disclosed in an embodiment of this application; Figure 2 This is a circuit diagram of a thermal management circuit for a converter disclosed in an embodiment of this application; Figure 3 This is a flowchart of a temperature control method for a converter disclosed in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a temperature controller for a converter disclosed in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a temperature control system for a converter disclosed in an embodiment of this application; Figure reference numerals: 100 - Thermal management circuit; 200 - Controller; 110 - Heating module; 120 - Thermal management execution module; 130 - Temperature acquisition module; 140 - Power interlock management module; QF1 - Main contact of the first power supply switching unit; QF1A - Interlocking contact of the first power supply switching unit; QF2 - Main contact of the second power supply switching unit; QF2A - Interlocking contact of the second power supply switching unit; K1 - Main contact of the first controlled unit; K1A - Interlock contact of the first controlled unit; K2 - Coil of the second controlled unit; K2A - Main contact of the second controlled unit; 210 - First control module; 220 - Second control module. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0021] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0022] like Figure 1 As shown, this application embodiment provides a thermal management circuit 100 for a converter, including: a heating module 110, a thermal management execution module 120, a temperature acquisition module 130, and a power interlock management module 140; the power interlock management module 140 is connected to an external auxiliary power supply, a first vehicle-mounted auxiliary power supply, the heating module 110, the thermal management execution module 120, and the temperature acquisition module 130, respectively; the power interlock management module 140 is used to: in preheating mode, establish a first power supply path so that the external auxiliary power supply supplies power to the heating module 110 so that the heating module 110 heats the converter; when the real-time temperature of the converter acquired by the temperature acquisition module 130 reaches a preset temperature, establish a second power supply path so that the first vehicle-mounted auxiliary power supply supplies power to the thermal management execution module 120, and cut off the first power supply path.

[0023] In this embodiment, the converter can specifically be a converter on a rail transit vehicle, the heating module 110 can specifically be a heating resistor assembly, the thermal management execution module 120 can specifically be an internal circulation fan, the first on-board auxiliary power supply and the external auxiliary power supply can specifically be three-phase power supplies, and the preset temperature is a pre-set temperature, which can be the temperature at which the converter can start normally. Through modular design, the functions of preheating, normal operation heat dissipation and temperature monitoring are integrated into a unified circuit architecture. The power interlock management module 140 serves as the core control hub. The working principle of the power interlock management module 140 is as follows: In the preheating mode, the power interlock management module 140 establishes a first power supply path powered by the external auxiliary power supply, driving the heating module 110... 10. To increase the ambient temperature inside the converter cabinet, when the temperature acquisition module 130 detects that the temperature inside the converter cabinet has reached the preset temperature, the power interlock management module 140 immediately performs a mode switch, cutting off the first power supply path so that the heating module 110 stops heating, and simultaneously establishing a second power supply path from the first vehicle auxiliary power supply to the thermal management execution module 120, so that the thermal management execution module 120 can dissipate heat from the converter cabinet. Throughout the process, the thermal management execution module 120 can strictly ensure that the preheating circuit and the normal operation circuit will not be connected at the same time through its internal hardware interlock, thereby building a safety defense at the circuit level and fundamentally avoiding the risk of equipment overheating caused by accidental activation of the heating circuit.

[0024] Compared with the prior art, this application provides a thermal management circuit, temperature control method, controller, and system for a converter. The thermal management circuit includes: a heating module 110, a thermal management execution module 120, a temperature acquisition module 130, and a power interlock management module 140. The power interlock management module 140 is connected to an external auxiliary power supply, a first on-board auxiliary power supply, the heating module 110, the thermal management execution module 120, and the temperature acquisition module 130, respectively. The power interlock management module 140 is used to: establish a first power supply path in preheating mode so that the external auxiliary power supply supplies power to the heating module 110, so that the heating module 110 heats the converter; when the temperature acquisition module 130 acquires the temperature... When the real-time temperature of the converter reaches the preset temperature, a second power supply path is established so that the first vehicle auxiliary power supply supplies power to the thermal management execution module 120, and the first power supply path is cut off. In this application, when the real-time temperature of the converter collected by the temperature acquisition module 130 reaches the preset temperature, the first power supply path is cut off and the second power supply path is established through the power interlock management module 140, which can realize the safe switching from the preheating mode to the normal operation mode. This forced management and isolation of the power supply paths of the two modes can fundamentally eliminate the risk of the converter overheating due to the malfunction of the heating circuit. At the same time, by deeply integrating the heating, heat dissipation and temperature control functions, the reliability and safety of the system can be significantly improved.

[0025] like Figure 2 As shown, in one embodiment of this application, the power interlock management module 140 is also used to establish a power supply connection for the thermal management execution module 120 in the preheating mode, so that the external auxiliary power supply simultaneously supplies power to the heating module 110 and the thermal management execution module 120, so that the thermal management execution module 120 cyclically disturbs the heat generated by the heating module 110.

[0026] In this embodiment, the thermal management execution module 120 (such as an internal circulation fan) is activated during the preheating stage. The air circulation effect of the thermal management execution module 120 is used to quickly and evenly diffuse the heat generated by the heating module 110 into the interior of the converter cabinet. This can avoid local overheating and achieve uniform temperature rise of the entire cabin, thereby significantly improving the efficiency and effect of preheating and creating conditions for the rapid and safe start-up of the converter.

[0027] like Figure 2 As shown, in one embodiment of this application, the power interlock management module 140 is connected to the second vehicle auxiliary power supply; the power interlock management module 140 is also used to establish a power supply connection for the temperature acquisition module 130 in the preheating mode, so that the second vehicle auxiliary power supply supplies power to the temperature acquisition module 130.

[0028] In this embodiment, by setting an independent circuit for the temperature acquisition module 130 to be powered by the second vehicle auxiliary power supply, this design can ensure that even if the first vehicle auxiliary power supply cannot work due to low temperature, the temperature acquisition module 130 can still operate independently and reliably in the preheating mode, and can provide accurate and uninterrupted temperature feedback for the entire heating process, which is the basis for realizing automated control and safety threshold protection.

[0029] like Figure 2 As shown, in one embodiment of this application, the power interlock management module 140 includes a first power on / off unit, a second power on / off unit, a first controlled unit, and a second controlled unit; the first end of the main contact K1 of the first controlled unit is connected to the first vehicle auxiliary power supply; the first end of the main contact QF1 of the first power on / off unit is connected to the second end of the main contact K1 of the first controlled unit and the external auxiliary power supply respectively; the second end of the main contact QF1 of the first power on / off unit is connected to the thermal management execution module 120; the external auxiliary power supply is connected to the heating module 110 through the main contact K2A of the second controlled unit and the main contact QF2 of the second power on / off unit; the second vehicle auxiliary power supply is connected to the temperature acquisition module 130 through the coil K2 of the second controlled unit, the interlocking contact QF1A of the first power on / off unit, the interlocking contact QF2A of the second power on / off unit, and the interlocking contact K1A of the first controlled unit.

[0030] In this embodiment, the power interlock management module 140 constructs a reliable hardware interlock network through the coordinated action of the first controlled unit, the second controlled unit, the first power on / off unit, the second power on / off unit, and their interlocking contacts. Its core lies in using the state (on / off) of the interlocking contacts to forcibly bind the circuit's logical state to the vehicle's operating mode. Its specific working principle is as follows: Preheating mode working principle: When the vehicle is in an extremely low temperature environment, the operator can manually close the main contact QF1 of the first power supply switching unit and the main contact QF2 of the second power supply switching unit. At this time, the circuit enters the preheating state. As the main contact QF1 of the first power switching unit is closed, the external auxiliary power flows through the main contact QF1 of the first power switching unit to supply power to the thermal management execution module 120, causing the thermal management execution module 120 to start working. Because the main contact QF1 of the first power switching unit is closed, the interlocking contact QF1A (normally open contact) of the first power switching unit is closed. The main contact QF2 of the second power switching unit is closed, causing the interlocking contact QF2A (normally open contact) of the second power switching unit to close. The second vehicle auxiliary power supply passes sequentially through the coil K2 of the second controlled unit, the interlocking contact QF1A of the first power switching unit, the interlocking contact QF2A of the second power switching unit, and the interlocking contact K1A (normally closed contact) of the first controlled unit to supply power to the temperature acquisition module 130, enabling the temperature acquisition module 130 to start acquiring the real-time temperature inside the converter cabinet and send the real-time temperature to the controller. The controller can specifically be a TCU (Traction Control Unit). As the coil K2 of the second controlled unit is energized, the main contact K2A of the second controlled unit is closed. Since the main contact QF2 of the second power supply switching unit is in a closed state, the external auxiliary power supply flows sequentially through the main contact K2A of the second controlled unit and the main contact QF2 of the second power supply switching unit to supply power to the heating module 110, causing the heating module 110 to start heating.

[0031] Normal operating mode working principle: When the temperature acquisition module 130 acquires the temperature of the converter and it reaches the preset temperature, the system prepares to switch to normal operation mode. The controller acquires the real-time temperature of the converter from the temperature acquisition module 130. When the real-time temperature reaches the preset temperature, it controls the coil of the first controlled unit to be energized (the coil of the first controlled unit is not shown in the attached figure), causing the main contact K1 (normally open contact) of the first controlled unit to close, so that the first vehicle auxiliary power supply supplies power to the thermal management execution module 120, and the converter enters normal operation. At the same time, it causes the interlock contact K1A (normally closed contact) of the first controlled unit to open, so that the temperature acquisition module 130 stops working, and the coil K2 of the second controlled unit is de-energized, so that the main contact K2A of the second controlled unit opens, so that the external auxiliary power supply stops supplying power to the heating module 110, and the heating module 110 stops heating. To further ensure safety, the controller can prompt the driver through the vehicle's display screen to disconnect the main contact QF2 of the second power supply switching unit, thereby disconnecting the interlocking contact QF2A of the second power supply switching unit, further ensuring that the temperature acquisition module 130 stops working and the heating module 110 stops heating. Interlocking principle: After the main contact K1 (normally open contact) of the first controlled unit is closed, the interlocking contact K1A (normally closed contact) of the first controlled unit is immediately opened. The interlocking contact K1A of the first controlled unit is connected in series between the second vehicle auxiliary power supply and the temperature acquisition module 130. The opening of the interlocking contact K1A of the first controlled unit physically cuts off the power supply path of the coil K2 of the second controlled unit. This means that even if someone accidentally closes the second power supply switch unit again at this time, the coil K2 of the second controlled unit cannot be energized because the interlocking contact K1A of the first controlled unit has been opened. The heating circuit still cannot be connected, thus realizing the reverse interlocking from the normal operation mode to the preheating mode.

[0032] In summary, this interlocking network achieves safe, reliable, and mandatory switching and isolation between two working modes through two core logics: "the closure of the first and second power on / off units is a prerequisite for preheating" and "the engagement of the first controlled unit is a result that the second power on / off unit must be disconnected." Combined with the status feedback of the interlocking contacts, it achieves safe, reliable, and mandatory switching and isolation between the two working modes.

[0033] In one embodiment of this application, the first controlled unit and / or the second controlled unit is an electromagnetic contactor or an electromagnetic relay.

[0034] In this embodiment, an electromagnetic contactor or relay is selected as the controlled unit, taking advantage of its coil drive, large contact capacity, and reliable mechanical interlocking characteristics. It is particularly suitable for harsh industrial environments where there is vibration and impact inside the traction converter, ensuring the stability and durability of the circuit during long-term operation.

[0035] In one embodiment of this application, the first power supply switching unit and the second power supply switching unit are manual circuit breakers.

[0036] In this embodiment, a manual circuit breaker is used as the power supply switching unit. On the one hand, it provides overload and short-circuit protection for the circuit, enhancing the safety of the system. On the other hand, its manual operation characteristic provides a clear physical break point for maintenance and repair. Combined with its interlocking contacts, the "manual disconnection" status signal is fed back to the control loop, forming a safety strategy that combines human-machine interaction and automatic control.

[0037] like Figure 2 As shown, in one embodiment of this application, the interlocking contact QF1A of the first power on / off unit and the interlocking contact QF2A of the second power on / off unit are normally open contacts, and the interlocking contact K1A of the first controlled unit is a normally closed contact.

[0038] In this embodiment, by setting the interlocking contact QF2A of the first power switching unit and the second power switching unit to normally open, and setting the interlocking contact K1A of the first controlled unit to normally closed, the interlocking logic of the circuit is cleverly realized. For example, the second vehicle auxiliary power supply can only supply power to the temperature control circuit when the normally open contact of the first power switching unit and the normally open contact of the second power switching unit are closed (preheating mode); and when the first controlled unit is engaged (normal operation mode), the normally closed contact of the first controlled unit is opened, forcibly cutting off the temperature control circuit. This "AND" logic (two conditions are met simultaneously) and "NOT" logic (one condition is negated) is reliably implemented through hardware contacts, which is the core guarantee of system safety.

[0039] In this embodiment of the application, as a supplement to the hardware interlock, the controller is also configured with status monitoring and fault protection logic. The controller collects the contact status signals of the first controlled unit and the second controlled unit in real time. When the logic analysis shows that the main contact K2A of the first controlled unit and the second controlled unit are both in an abnormal closed state, the controller will determine that the interlock has failed and immediately execute the fault protection strategy: forcibly prohibit the output of the coil closing command of the first controlled unit, and at the same time issue an alarm of "contactor status abnormal" to the driver through the human-machine interface (such as the locomotive display screen).

[0040] like Figure 3 As shown, this application also provides a temperature control method for a converter, executed by a temperature controller connected to the thermal management circuit described above. The method includes: S11. In the preheating mode, the control power interlock management module establishes the first power supply path so that the external auxiliary power supply supplies power to the heating module so that the heating module heats the converter. S12. Obtain the real-time temperature of the converter collected by the temperature acquisition module. When the real-time temperature reaches the preset temperature, control the power supply interlock management module to establish a second power supply path so that the first vehicle auxiliary power supply supplies power to the thermal management execution module and cuts off the first power supply path.

[0041] like Figure 4 As shown, this application also provides a temperature controller for a converter, the temperature controller being connected to the thermal management circuit as described above, the controller comprising: The first control module 210 is used to control the power interlock management module to establish a first power supply path in the preheating mode so that the external auxiliary power supply supplies power to the heating module so that the heating module heats the converter. The second control module 220 is used to acquire the real-time temperature of the converter collected by the temperature acquisition module. When the real-time temperature reaches the preset temperature, the control power interlock management module establishes a second power supply path so that the first vehicle auxiliary power supply supplies power to the thermal management execution module and cuts off the first power supply path.

[0042] like Figure 5 As shown, this application also provides a temperature control system for a converter, including a temperature controller 200 as described above and a thermal management circuit 100 as described in any of the above claims. The temperature controller 200 is connected to the temperature acquisition module 130 and the power interlock management module 140 in the thermal management circuit 100.

[0043] It should be understood that the use of terms such as "system," "device," "unit," and / or "module" in this application is merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0044] The embodiments in this specification are described in a progressive manner, with each embodiment focusing on the related aspects. For any differences between the embodiments, or for the same or similar parts between the embodiments, please refer to each other.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal management circuit for a converter, characterized in that, include: Heating module, thermal management execution module, temperature acquisition module, and power interlock management module; The power interlock management module is connected to the external auxiliary power supply, the first vehicle auxiliary power supply, the heating module, the thermal management execution module and the temperature acquisition module respectively. The power interlock management module is used for: In preheating mode, a first power supply path is established so that the external auxiliary power supply supplies power to the heating module so that the heating module heats the converter; When the real-time temperature of the converter acquired by the temperature acquisition module reaches the preset temperature, a second power supply path is established so that the first vehicle auxiliary power supply supplies power to the thermal management execution module, and the first power supply path is cut off.

2. The thermal management circuit according to claim 1, characterized in that, The power interlock management module is also used to establish a power supply connection for the thermal management execution module in the preheating mode, so that the external auxiliary power supply simultaneously supplies power to the heating module and the thermal management execution module, so that the thermal management execution module cyclically disturbs the heat generated by the heating module.

3. The thermal management circuit according to claim 2, characterized in that, The power interlock management module is connected to the second vehicle-mounted auxiliary power supply; The power interlock management module is also used to establish a power supply connection for the temperature acquisition module in the preheating mode, so that the second vehicle auxiliary power supply supplies power to the temperature acquisition module.

4. The thermal management circuit according to claim 3, characterized in that, The power interlock management module includes a first power on / off unit, a second power on / off unit, a first controlled unit, and a second controlled unit. The first end of the main contact of the first controlled unit is connected to the first vehicle auxiliary power supply; The first end of the main contact of the first power switching unit is connected to the second end of the main contact of the first controlled unit and the external auxiliary power supply, respectively. The second end of the main contact of the first power on / off unit is connected to the thermal management execution module; The external auxiliary power supply is connected to the heating module through the main contacts of the second controlled unit and the main contacts of the second power on / off unit; The second vehicle auxiliary power supply is connected to the temperature acquisition module through the coil of the second controlled unit, the interlocking contact of the first power on / off unit, the interlocking contact of the second power on / off unit, and the interlocking contact of the first controlled unit.

5. The thermal management circuit according to claim 4, characterized in that, The first controlled unit and / or the second controlled unit is an electromagnetic contactor or an electromagnetic relay.

6. The thermal management circuit according to claim 4, characterized in that, The first power switching unit and the second power switching unit are manual circuit breakers.

7. The thermal management circuit according to any one of claims 4 to 6, characterized in that, The interlocking contacts of the first power switching unit and the second power switching unit are normally open contacts, while the interlocking contacts of the first controlled unit are normally closed contacts.

8. A temperature control method for a converter, characterized in that, Performed by a temperature controller connected to the thermal management circuit as described in claim 1, the method includes: In preheating mode, the power interlock management module is controlled to establish a first power supply path so that the external auxiliary power supply supplies power to the heating module so that the heating module heats the converter; The real-time temperature of the converter is acquired by the temperature acquisition module. When the real-time temperature reaches a preset temperature, the power interlock management module is controlled to establish a second power supply path so that the first vehicle auxiliary power supply supplies power to the thermal management execution module, and the first power supply path is cut off.

9. A temperature controller for a converter, characterized in that, The temperature controller is connected to the thermal management circuit as described in claim 1, the controller comprising: The first control module is used to control the power interlock management module to establish a first power supply path in the preheating mode, so that the external auxiliary power supply supplies power to the heating module, so that the heating module heats the converter. The second control module is used to acquire the real-time temperature of the converter collected by the temperature acquisition module. When the real-time temperature reaches the preset temperature, the control module controls the power interlock management module to establish a second power supply path so that the first vehicle auxiliary power supply supplies power to the thermal management execution module and cuts off the first power supply path.

10. A temperature control system for a converter, characterized in that, Includes the temperature controller as described in claim 9 and the thermal management circuit as described in any one of claims 1 to 7; The temperature controller is connected to the temperature acquisition module and the power interlock management module in the thermal management circuit.

Images