Active temperature control circuit and device for cooling water channel of power device

Abstract

The invention relates to the technical field of temperature control, in particular to an active temperature control circuit and device for a power device cooling water channel, which mainly comprises a three-phase current thermoelectric effect board and a power device cooling water channel cover plate, and can utilize waste heat energy to carry out active temperature control through a hot spot effect board without depending on and damaging other electric energy, so that the power device cooling water channel can be effectively controlled. Besides, the thermoelectric effect is automatically controlled to balance the temperature of the cooling water channel of the power device through the arranged switch element and the energy storage element, when the temperature difference between the two faces of the three-phase current thermoelectric effect plate is large enough, one path of generated electric energy is stored in the energy storage element, and the other path of generated electric energy provides a power source for the cooling water channel cover plate of the power device. The cooling device is used for cooling a cooling water channel of the power device. When the temperature difference between the two faces of the three-phase current thermoelectric effect plate is insufficient, the energy storage element serves as a power source of the power device cooling water channel cover plate, continuous active cooling is conducted till electric energy is exhausted, the structure and control logic are simple, and the effect is remarkable.

Description

Technical Field

[0001] The present application relates to the field of temperature control technology, and in particular to an active temperature control circuit and device for a cooling water channel of a power device. Background Art

[0002] Power devices (IGBT) and even power bricks are the core components of current and even future electronic controls (range extender power generation systems and electric drives). They undertake and perform the main task of power output. The failure of power devices (IGBT) is equivalent to the failure of the power generation or electric drive system assembly. What affects the operation of power devices (IGBT) and even the performance of the assembly is the operating temperature.

[0003] In the current industry, power devices (IGBT) are cooled by coolant cooling water channels. However, because other controllers and actuators are connected in series in the entire water channel and are affected by the ambient temperature of the cabin, the cooling of the power device (IGBT) is ultimately passive (the cooling of the power device is affected by other controllers connected in series in the cooling water channel and the working environment temperature. The IGBT can only be cooled and dissipated to a certain temperature based on the temperature of the coolant). The cooling effect is uncontrollable, resulting in a limited overall success rate and even the failure of the power device shutdown assembly to work. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present application provides an active temperature control circuit and device for a power device cooling water channel, which can utilize waste heat energy to perform active temperature control through a hot spot effect plate without relying on or damaging other electrical energy.

[0005] In a first aspect, the present application provides an active temperature control circuit for a cooling water channel of a power device, comprising:

[0006] A three-phase current thermoelectric effect plate is installed on the upper part of the three-phase line of the electric control, and the heating surface of the three-phase current thermoelectric effect plate faces the inside of the electric control, and the cooling surface faces the outside of the cabin, so as to generate electric energy based on the temperature difference between the heating surface and the cooling surface;

[0007] The power device cooling water channel cover plate is fitted with the cooling water channel of the power device, and the power device cooling water channel cover plate is connected to the three-phase current thermoelectric effect plate, and is used to use the electric energy generated by the three-phase current thermoelectric effect plate to actively control the temperature of the cooling water channel of the power device.

[0008] In a possible implementation, it further includes:

[0009] A switch element is arranged between the three-phase current thermoelectric effect plate and the power device cooling water channel cover plate, and is used to turn on the switch element when the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is greater than or equal to a set temperature difference threshold, so as to use the electric energy generated by the three-phase current thermoelectric effect plate as the working power supply of the power device cooling water channel cover plate; and when the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is less than the set temperature difference threshold, the switch element is turned off to consume the electric energy generated by the three-phase current thermoelectric effect plate through a set load resistor.

[0010] In a possible implementation, it further includes:

[0011] An energy storage element is arranged between the switch element and the power device cooling water channel cover plate, and is used to, when the switch element is turned on, use the electric energy generated by the three-phase current thermoelectric effect plate as the working power supply of the power device cooling water channel cover plate in one way, and transmit the other way to the energy storage element for storage; and when the switch element is turned off, the energy storage element is used as the working power supply of the power device cooling water channel cover plate until the stored electric energy is exhausted.

[0012] In a possible implementation, it further includes:

[0013] A voltage detection element is connected to the output end of the switch element, and the output end of the voltage detection element is connected to an LED indicator light for detecting whether the switch element is turned on, wherein if the switch element is turned on, the LED indicator light is on, and if the switch element is turned off, the LED indicator light is off.

[0014] In a possible implementation, the switching element is a triode, the energy storage element is a supercapacitor, the output end of the three-phase current thermoelectric effect plate is directly connected to the collector of the triode in one path, and is connected to the base of the triode via a first resistor R1 in another path, the emitter of the triode is connected to the positive electrode of the power device cooling water channel cover plate via a first diode D1 and a second diode D2 in sequence, and the positive electrode of the supercapacitor is connected between the first diode D1 and the second diode D2.

[0015] In a possible implementation manner, one end of the load resistor is grounded, and the other end is connected to the base of the transistor.

[0016] In a possible implementation, the input end of the voltage detection element is connected to the emitter of the transistor; the output end of the voltage detection element is connected between the first resistor R1 and the load resistor via a third transistor D3 and an LED indicator in sequence.

[0017] In a possible implementation, the voltage detection element adopts model BD4945G, wherein when the switch element is turned on, the voltage detection element outputs a high level and the LED indicator light is on; when the switch element is turned off, the voltage detection element outputs a low level and the LED indicator light is off.

[0018] In a second aspect, the present application provides an active temperature control device for a cooling water channel of a power device, comprising any active temperature control circuit for a cooling water channel of a power device as described in the first aspect above.

[0019] In a third aspect, the present application provides an active temperature control method for a power device cooling water channel, which is applied to any active temperature control circuit for a power device cooling water channel described in the first aspect above, and the method comprises the following steps:

[0020] Generate electrical energy based on the temperature difference between the heated surface and the cooled surface of the thermoelectric effect plate of the three-phase current;

[0021] The electric energy generated by the three-phase current thermoelectric effect plate is transmitted to the power device cooling water channel cover plate, and the cover plate is powered to actively control the temperature of the power device cooling water channel.

[0022] The present embodiment provides an active temperature control circuit and device for a cooling water channel of a power device. The circuit and device can actively control the temperature of the cooling water channel of a power device (IGBT) by combining the waste heat energy generated or received by the operation of the electric control itself with a three-phase current thermoelectric effect plate and a power device cooling water channel cover plate without relying on or consuming other electric energy or causing physical loss to various components. In addition, no new components such as heat insulation and water channels are added, and the design cost is low.

[0023] In other embodiments, the temperature of the cooling water channel of the thermoelectric balance power device (IGBT) is automatically controlled by setting a switching element, an energy storage element and a voltage detection element. When the temperature difference between the two sides of the three-phase current thermoelectric effect plate is large enough, the generated electric energy is stored in the energy storage element on one side, and the other side is used to provide power for the power device cooling water channel cover plate, which is used to cool the cooling water channel of the power device (IGBT); when the temperature difference between the two sides of the three-phase current thermoelectric effect plate is insufficient, the energy storage element is used as the power source for the power device cooling water channel cover plate, and the temperature is continuously and actively reduced until the electric energy is exhausted. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 An active temperature control circuit diagram for a cooling water channel of a power device according to an embodiment of the present application is shown;

[0026] Figure 2 A schematic diagram showing the current flow when the switch element is not conducting according to an embodiment of the present application is shown;

[0027] Figure 3 A schematic diagram showing the current flow when a switch element is turned on according to an embodiment of the present application is shown;

[0028] Figure 4 A schematic diagram of the current flow of an energy storage element providing power to a cooling water channel cover plate of a power device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] At present, the industry uses coolant cooling water channels to cool power devices (IGBT), but because other controllers and actuators are connected in series in the entire water channel and are affected by the cabin ambient temperature, the cooling of the power device (IGBT) is ultimately passive (the cooling of the power device is affected by other controllers connected in series in the cooling water channel and the working environment temperature, and the temperature of the coolant can only cool the IGBT to a certain temperature), and the cooling effect is uncontrollable. In view of this, the present application provides an active temperature control circuit and device for a power device cooling water channel, which can use waste heat energy to perform active temperature control through a hot spot effect plate without relying on or damaging other electrical energy.

[0035] See the instruction manual Figure 1 , an active temperature control circuit for a power device cooling water channel provided in one embodiment of the present application is mainly composed of a three-phase current thermoelectric effect plate and a power device cooling water channel cover plate, and the three-phase current thermoelectric effect plate and the power device cooling water channel cover plate both use thermoelectric effect. Among them, there are two types of thermoelectric effect plates, one is temperature difference power generation (Seebeck effect), when there is a temperature difference between the two ends of the thermoelectric effect plate, a current will be generated in the closed electrical circuit containing the device; the other is power-on cooling (Peltier effect), when current flows through the thermoelectric effect plate, a temperature difference will be generated between the two ends of the device, and by adjusting the size and direction of the current flowing through, one end of the plate can be cooled and the other end can be heated. In the present application, the three-phase current thermoelectric effect plate uses temperature difference to generate electricity, and the power device cooling water channel cover plate uses power-on cooling.

[0036] Specifically, in the present application, the three-phase current thermoelectric effect plate, the plate body is a semiconductor refrigeration device, installed on the upper part of the three-phase line of the electric control, replacing the original three-phase line cover (the original three-phase line cover is used for the internal installation of the integrated motor three-phase line and the three-phase of the electric control); wherein, the heating surface of the three-phase current thermoelectric effect plate faces the connection point of the three-phase line inside the electric control, receiving the internal temperature from the electric control when it is running, and the cooling surface faces the external cabin, affected by the external temperature of the cabin. Since it is an integrated motor and electric control, when running, in addition to the heat generated by its own operation, the inside of the electric control is also baked by the heat from the motor end or even from the heat engine end. The temperature of the installation surface facing the inside of the electric control is higher than that facing the outside of the cabin, resulting in a temperature difference. The plate body adopts a semiconductor refrigeration device to generate electricity using the temperature difference, and the generated electric energy is transmitted to the power device cooling water channel cover, and the power device cooling water channel cover is arranged in a close relationship with the cooling water channel of the power device. After receiving the electric energy transmitted by the three-phase current thermoelectric effect plate, the cooling water channel of the power device is actively temperature controlled (including cooling).

[0037] Furthermore, the active temperature control circuit for the power device cooling water channel also includes a switching element and an energy storage element. The switching element is arranged between the three-phase current thermoelectric effect plate and the power device cooling water channel cover plate, and is used to turn on the switching element when the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is greater than or equal to a set temperature difference threshold, so as to use the electric energy generated by the three-phase current thermoelectric effect plate as the working power supply of the power device cooling water channel cover plate; and when the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is less than a set temperature difference threshold, the switching element is turned on. When the difference threshold is reached, the switch element is closed to consume the electric energy generated by the three-phase current thermoelectric effect plate through the set load resistor; the energy storage element is arranged between the switch element and the power device cooling water channel cover plate, and is used to, when the switch element is turned on, use the electric energy generated by the three-phase current thermoelectric effect plate as the working power supply of the power device cooling water channel cover plate in one way and transmit the other way to the energy storage element for storage; and when the switch element is closed, the energy storage element is used as the working power supply of the power device cooling water channel cover plate until the stored electric energy is exhausted.

[0038] In one embodiment, the switching element is a triode, and the energy storage element is a supercapacitor with a model of 1EECF5RU155. One end of the three-phase current thermoelectric effect plate is grounded, and the other end (output end) is directly connected to the collector of the triode, and the other end is connected to the base of the triode via a first resistor R1. The emitter of the triode is connected to the positive electrode of the power device cooling water channel cover plate via a first diode D1 and a second diode D2 in sequence. The positive electrode of the supercapacitor is connected between the first diode D1 and the second diode D2, and one end of the load resistor R2 is grounded, and the other end is connected to the base of the triode.

[0039] Among them, the reason why the switch element is set is that the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is not the temperature difference between the heating surface and the cooling surface of the power device installed in the power generation / electric drive system assembly in the vehicle cabin at the beginning, but the temperature difference gradually increases with the increase of working time. The maximum temperature difference is estimated to be about 60°C (the vehicle is used in the extremely cold environment in the north), and the three-phase current thermoelectric effect cover will be the largest at this time. For example, in the process of gradually increasing the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate, the voltage generated gradually increases from 0 to 5V, and the current increases from 0 to 45A, so the maximum power will be 225W. When the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is small, the current / voltage generated is low and unstable, and it cannot provide electrical energy for the power device cooling water channel cover to power it on for cooling, and even affects the service life of the power device cooling water channel cover, resulting in performance degradation.

[0040] Therefore, in the present application, a temperature difference threshold is set. When the temperature difference between the heated surface and the cooled surface of the three-phase current thermoelectric effect plate is greater than or equal to the set temperature difference threshold, it means that sufficiently large and stable electric energy can be generated as the working power source for the power device cooling water channel cover. For example, in one embodiment, the temperature difference threshold is set to 10°C. When the temperature difference between the heated surface and the cooled surface of the three-phase current thermoelectric effect plate is greater than or equal to 10°C, the base current is expected to be 7.5A (Ib) and the collector current (IC) is expected to exceed 15A. The NPN transistor is turned on. At this time, the three-phase current thermoelectric effect plate generates electricity, one way is given to the supercapacitor C1EECF5RU155 for storage, and the other way is given to the power device cooling water channel cover plate for active cooling of the power device IGBT cooling water channel. The temperature cooling range of the power device IGBT cooling water channel is expected to be 0-15°C; and when the temperature difference between the heated surface and the cooled surface of the three-phase current thermoelectric effect plate is less than 10°C, the generated electric energy is not enough to turn on the NPN transistor. At this time, the small current generated by the three-phase current thermoelectric effect plate is consumed back to ground through the first resistor R1 and the load resistor R2. Among them, the current direction when the switch element is not turned on can be referred to the attached manual. Figure 2 The current flow when the switch element is turned on can be found in the appendix of the manual. Figure 3 .

[0041] See the instruction manual Figure 4When the power generation / electric drive system stops working, the temperature difference of the three-phase current thermoelectric effect plate will gradually disappear, and the temperature difference electricity generation will gradually disappear. At this time, in order to actively cool the power device IGBT cooling water channel for a period of time, the super capacitor C1EECF5RU155 will continue to provide 5.5V (1F), 4A continuous current to the power device cooling water channel cover plate through the second diode D2 as its working power supply to actively cool the power device IGBT cooling water channel until the electric energy stored in the super capacitor C1EECF5RU155 is exhausted. Among them, since the anode of the first diode D1 is connected to the emitter of the transistor, and the cathode is connected to the positive electrode of the super capacitor, the current output by the super capacitor is cut off at the first diode D1 and will not be reversely input into the circuit.

[0042] In addition, in the present application, the active temperature control circuit for the cooling water channel of the power device also includes a voltage detection element, which is connected to the output end of the switching element, and the output end of the voltage detection element is connected to an LED indicator light for detecting whether the switching element is turned on, wherein if the switching element is turned on, the LED indicator light is on, and if the switching element is turned off, the LED indicator light is off.

[0043] In one embodiment, the voltage detection element adopts the model BD4945G, wherein, when the switch element is turned on, the electric energy generated by the three-phase current thermoelectric effect plate is divided into three paths, the first path is given to the super capacitor C1EECF5RU155 for storage, the second path is given to the power device cooling water channel cover plate for active cooling of the power device IGBT cooling water channel, and the third path is given to the voltage detection element, the voltage detection element outputs a high level, and the LED indicator lights up; when the switch element is turned off (whether the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is less than the set temperature threshold at the beginning, or when the energy storage element provides electric energy to the power device cooling water channel cover plate), the voltage detection element outputs a low level, and the LED indicator goes out. The LED indicator can reflect whether the three-phase current thermoelectric effect plate is running at full power (the temperature difference between the heating surface and the cooling surface is greater than or equal to the set temperature threshold).

[0044] It can be seen that the active temperature control circuit for the cooling water channel of the power device provided in the present application can use waste heat energy to perform active temperature control through the hot spot effect plate without relying on or damaging other electrical energy, which can extend the service life of the power device (IGBT), and objectively extend the service life of the power generation or electric drive system assembly, bringing product value preservation benefits to the end user, and does not add any new components such as insulation and water channels, and the design cost is low; in addition, the temperature of the cooling water channel of the thermoelectric effect balanced power device (IGBT) is automatically controlled by the set switching element and energy storage element, wherein, when the temperature difference between the two sides of the three-phase current thermoelectric effect plate is large enough, the generated electrical energy is stored in the energy storage element in one way, and the other way is used to provide power for the power device cooling water channel cover plate, which is used to cool the cooling water channel of the power device (IGBT); and when the temperature difference between the two sides of the three-phase current thermoelectric effect plate is insufficient, the energy storage element is the power source of the power device cooling water channel cover plate, and the active cooling is continued until the electrical energy is exhausted, the structure and control logic are simple, and the effect is significant.

[0045] The present application also provides an active temperature control device for a power device cooling water channel, which uses the above-mentioned active temperature control cable for a power device cooling water channel, and can use waste heat energy to perform active temperature control through a hot spot effect plate without relying on or damaging other electrical energy. Since the principle of solving the problem by the active temperature control device in the embodiment of the present application is similar to the above-mentioned active temperature control circuit in the embodiment of the present application, the implementation of the active temperature control device can refer to the implementation of the active temperature control circuit, and the repeated parts will not be repeated.

[0046] The present application also provides an active method for a cooling water channel of a power device, which is applied to the active temperature control circuit for the cooling water channel of a power device described in any of the above embodiments, and the method includes the following steps: generating electric energy based on the temperature difference between the heated surface and the cooled surface of the three-phase current thermoelectric effect plate; transmitting the electric energy generated by the three-phase current thermoelectric effect plate to the cooling water channel cover of the power device, and supplying power to it, so as to actively control the temperature of the cooling water channel of the power device. In other embodiments, for example, when the active temperature control circuit for the cooling water channel of the power device also includes a switching element, an energy storage element, and a voltage detection element, the principle of solving the problem by the active temperature control method is similar to the above-mentioned active temperature control circuit in the embodiment of the present application, so the implementation of the active temperature control method can refer to the implementation of the active temperature control circuit, and the repeated parts will not be repeated.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An active temperature control circuit for a cooling water channel of a power device, characterized in that: include: A three-phase current thermoelectric effect plate is installed on the upper part of the three-phase line of the electric control, and the heating surface of the three-phase current thermoelectric effect plate faces the inside of the electric control, and the cooling surface faces the outside of the cabin, so as to generate electric energy based on the temperature difference between the heating surface and the cooling surface; The power device cooling water channel cover plate is fitted with the cooling water channel of the power device, and the power device cooling water channel cover plate is connected to the three-phase current thermoelectric effect plate, and is used to use the electric energy generated by the three-phase current thermoelectric effect plate to actively control the temperature of the cooling water channel of the power device.

2. The active temperature control circuit for a cooling water channel of a power device according to claim 1, characterized in that: Also includes: A switch element is arranged between the three-phase current thermoelectric effect plate and the power device cooling water channel cover plate, and is used to turn on the switch element when the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is greater than or equal to a set temperature difference threshold, so as to use the electric energy generated by the three-phase current thermoelectric effect plate as the working power supply of the power device cooling water channel cover plate; and when the temperature difference between the heating surface and the cooling surface of the three-phase current thermoelectric effect plate is less than the set temperature difference threshold, the switch element is turned off to consume the electric energy generated by the three-phase current thermoelectric effect plate through a set load resistor.

3. The active temperature control circuit for a cooling water channel of a power device according to claim 2, characterized in that: Also includes: An energy storage element is arranged between the switch element and the power device cooling water channel cover plate, and is used to, when the switch element is turned on, use the electric energy generated by the three-phase current thermoelectric effect plate as the working power supply of the power device cooling water channel cover plate in one way, and transmit the other way to the energy storage element for storage; and when the switch element is turned off, the energy storage element is used as the working power supply of the power device cooling water channel cover plate until the stored electric energy is exhausted.

4. The active temperature control circuit for a cooling water channel of a power device according to claim 3, characterized in that: Also includes: A voltage detection element is connected to the output end of the switch element, and the output end of the voltage detection element is connected to an LED indicator light for detecting whether the switch element is turned on, wherein if the switch element is turned on, the LED indicator light is on, and if the switch element is turned off, the LED indicator light is off.

5. The active temperature control circuit for a cooling water channel of a power device according to claim 4, characterized in that: The switching element adopts a triode, the energy storage element adopts a supercapacitor, the output end of the three-phase current thermoelectric effect plate is directly connected to the collector of the triode in one path, and is connected to the base of the triode via a first resistor R1 in another path, the emitter of the triode is connected to the positive electrode of the power device cooling water channel cover plate via a first diode D1 and a second diode D2 in sequence, and the positive electrode of the supercapacitor is connected between the first diode D1 and the second diode D2.

6. The active temperature control circuit for a cooling water channel of a power device according to claim 5, characterized in that: One end of the load resistor is grounded, and the other end is connected to the base of the triode.

7. An active temperature control circuit for a cooling water channel of a power device according to claim 6, characterized in that: The input end of the voltage detection element is connected to the emitter of the transistor; the output end of the voltage detection element is connected between the first resistor R1 and the load resistor via the third transistor D3 and the LED indicator light in sequence.

8. The active temperature control circuit for a cooling water channel of a power device according to claim 7, characterized in that: The model of the voltage detection element is BD4945G, wherein when the switch element is turned on, the voltage detection element outputs a high level and the LED indicator light is on; when the switch element is turned off, the voltage detection element outputs a low level and the LED indicator light is off.

9. An active temperature control device for a cooling water channel of a power device, characterized in that: The invention comprises an active temperature control circuit for a cooling water channel of a power device as described in any one of claims 1 to 8.

10. An active temperature control method for a power device cooling water channel, characterized in that: The active temperature control circuit for a cooling water channel of a power device as claimed in any one of claims 1 to 8 comprises the following steps: Generate electrical energy based on the temperature difference between the heated surface and the cooled surface of the thermoelectric effect plate of the three-phase current; The electric energy generated by the three-phase current thermoelectric effect plate is transmitted to the power device cooling water channel cover plate, and the cover plate is powered to actively control the temperature of the power device cooling water channel.

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