A current conversion module and an energy storage converter

Abstract

The utility model discloses a variable flow module and energy storage converter, variable flow module includes: shell module, switch module, liquid cooling medium and inductance module, liquid cooling medium is located at the inside of shell module, switch module and inductance module are located at the inside of liquid cooling medium, and switch module is connected with inductance module, and shell module is connected with switch module, inductance module, the heat generated when switch module and inductance module work is in turn through liquid cooling medium and shell module and sends out. The utility model discloses through liquid cooling medium and the direct contact of heating switch module, inductance module, and heat does not need to pass through additional heat transfer medium conduction, directly from the heating element transmission to cooling medium, shorten the heat transfer path, improve the radiating efficiency and cooling effect.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to a converter module and an energy storage converter. Background Technology

[0002] A power conversion system (PCS) is a core power electronic device in an energy storage system, primarily responsible for the efficient conversion and regulation of direct current (DC) and alternating current (AC). The junction temperature of the internal power devices is crucial to the efficiency of the power conversion system. Current technologies for cooling power conversion systems mainly employ the following methods: 1) Air cooling: The power components are in contact with the heat sink, and the heat sink and other heat-generating components are in the air duct. The heat generated by the power components is conducted to the heat sink, and the flowing air carries away the heat from the heat sink and other heat-generating components. 2) Liquid cooling: The heating element is in contact with the liquid cooling plate, which has cooling liquid channels. The heat generated by the heating element is conducted to the liquid cooling plate, and the liquid cooling plate then exchanges heat with the coolant in its internal channels and carries it away. 3) Phase change cooling: The heating element is attached to the heat pipe, or the power element is attached to the heat sink, and the heat sink is attached to the heat pipe / evaporative cooling device. The other end of the heat pipe / evaporative cooling device is in the air duct. The heat generated by the heating element is conducted to the other end of the heat pipe / evaporative cooling device, and the flowing air carries the heat away from the other end of the heat pipe / evaporative cooling device. 4) Natural cooling: The power components are in contact with the heat sink, while the heat sink and other heat-generating components are in the air.

[0003] Therefore, in the existing cooling methods, there is a non-direct contact heat transfer path between the heat-generating element and the cooling medium (air / coolant). Heat needs to be conducted through intermediate carriers such as radiators, liquid cooling plates, and heat pipes, resulting in low heat dissipation efficiency and poor cooling effect. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a converter module and energy storage converter, which shortens the heat transfer path and improves heat dissipation efficiency and cooling effect by directly contacting the heating element with the cooling medium.

[0005] This utility model is implemented according to the following scheme: A converter module is provided, comprising: a housing module, a switch module, a liquid cooling medium, and an inductor module; the liquid cooling medium is disposed inside the housing module; the switch module and the inductor module are disposed inside the liquid cooling medium, the switch module is connected to the inductor module, and the housing module is connected to the switch module and the inductor module; The heat generated by the switch module and the inductor module during operation is dissipated sequentially through the liquid cooling medium and the outer casing module.

[0006] Compared with the prior art, the beneficial effects of the converter module of this utility model are as follows: the liquid cooling medium is in direct contact with the heat-generating switch module and inductor module, so the heat does not need to be conducted through an additional heat transfer medium, but is directly transferred from the heat-generating element to the cooling medium, shortening the heat transfer path and improving heat dissipation efficiency and cooling effect.

[0007] Optionally, the housing module includes a housing and a heat exchanger connected to the outside of the housing, the liquid cooling medium is disposed inside the housing, and the housing is connected to the switch module and the inductor module.

[0008] Optionally, the housing includes a sealed cable connector, which is connected to the switch module and the inductor module.

[0009] Optionally, an electronic pump may also be included, which is located inside the liquid cooling medium.

[0010] Optionally, a temperature sensor may also be included, which is located inside the liquid cooling medium.

[0011] Optionally, the switching module includes a bridge arm unit composed of power devices, wherein the bridge arm unit is one of a two-level bridge arm, an I-type three-level bridge arm, a T-type three-level bridge arm, a three-bridge arm, or a four-bridge arm.

[0012] Optionally, the power device is either an IGBT or a SiC MOSFET.

[0013] Optionally, the liquid cooling medium is either mineral oil or fluorinated liquid.

[0014] An energy storage converter is also provided, including a peripheral circuit module and the aforementioned converter module, wherein the peripheral circuit module is connected to the converter module.

[0015] Optionally, the peripheral circuit module includes a DC-side peripheral circuit and an AC-side peripheral circuit. The switch module is connected to the DC-side peripheral circuit through the housing module, and the inductor module is connected to the AC-side peripheral circuit through the housing module. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the converter module of this utility model; Figure 2 This is a schematic diagram of the energy storage converter of this utility model; The attached diagram shows the following reference numerals: 1. Converter module; 101. Housing module; 1011. Housing; 1012. Heat exchanger; 1013. Sealed cable connector; 102. Switch module; 103. Liquid cooling medium; 104. Inductor module; 105. Electronic pump; 2. Peripheral circuit module; 201. DC side peripheral circuit; 202. AC side peripheral circuit; 203. Control circuit board. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0019] See Figure 1 As shown, a power converter module 1 of this utility model includes: a housing module 101, a switch module 102, a liquid cooling medium 103, and an inductor module 104; the liquid cooling medium 103 is disposed inside the housing module 101; the switch module 102 and the inductor module 104 are disposed inside the liquid cooling medium 103, the switch module 102 is connected to the inductor module 104, and the housing module 101 is connected to the switch module 102 and the inductor module 104; the heat generated by the switch module 102 and the inductor module 104 during operation is dissipated sequentially through the liquid cooling medium 103 and the housing module 101.

[0020] This invention allows the liquid cooling medium 103 to directly contact the heating switch module 102 and inductor module 104, eliminating the need for heat transfer through an additional heat transfer medium. Heat is directly transferred from the heating element to the cooling medium, shortening the heat transfer path and improving heat dissipation efficiency and cooling effect.

[0021] In one embodiment of the present invention, the outer casing module 101 includes a casing 1011 and a heat exchanger 1012 connected to the outside of the casing 1011. A liquid cooling medium 103 is disposed inside the casing 1011. The casing 1011 is connected to the switch module 102 and the inductor module 104. The casing 1011 includes a sealed cable connector 1013, which is connected to the switch module 102 and the inductor module 104.

[0022] The housing 1011 is a sealed housing 1011 to ensure that the liquid cooling medium 103 inside will not leak; the heat exchanger 1012 is one of a finned air radiator or a liquid-cooled radiator. If the heat exchanger 1012 is a finned air radiator, the finned air radiator contacts the air through the fins, and the side of the finned air radiator opposite to the fins is located outside the housing 1011.

[0023] For finned air radiators, the expression for the temperature of the insulating medium is as follows:

[0024] in, Temperature of the insulating medium; The ambient air temperature; This is for the internal heat generation of the converter power module; This invention relates to the thermal resistance of finned air radiators; the thermal resistance of finned air radiators can be controlled by adjusting the fins of the finned air radiator. The resistance value is used to control the temperature of the insulating medium. relative to the ambient air temperature The temperature rise.

[0025] For liquid-cooled heat sinks, the expression for the temperature of the insulating medium is as follows:

[0026] in, Temperature of the insulating medium; The ambient air temperature; This is for the internal heat generation of the converter power module; This refers to the thermal resistance of the liquid cooler.

[0027] For the power devices within the switching module, the junction temperature expression for the power devices is as follows:

[0028] in, This refers to the junction temperature of the power device; To transfer heat, i.e., the power of the power device; The junction-to-package surface thermal resistance is an inherent parameter of the power device. For liquid convection thermal resistance, , The convective heat transfer coefficient is the coefficient of heat transfer when a phase change occurs. The convective heat transfer coefficient is the coefficient for phase change.

[0029] By determining the convective heat transfer coefficient of the cooling liquid in the liquid-cooled radiator And boiling point, using the liquid The characteristic of relatively large values ​​makes The value is relatively low to control the operation of power devices and reduce junction temperature; this invention transfers heat... When the value is large, the flow of the liquid cooling medium can be increased by operating an electric pump to increase the convective heat transfer coefficient. The numerical value.

[0030] In one embodiment of this utility model, an electronic pump 105 is also included. The electronic pump 105 is disposed inside the liquid cooling medium 103. The electronic pump 105 is used to increase the fluidity of the liquid cooling medium 103 and enhance the speed and efficiency of the liquid cooling medium 103 in removing the heat generated by the switch module 102 and the inductor module 104 during operation. A temperature sensor is also included. The temperature sensor is disposed inside the liquid cooling medium 103 to monitor the temperature of the liquid cooling medium 103 in real time.

[0031] In one embodiment of this utility model, the switch module 102 includes a bridge arm unit composed of power devices. The bridge arm unit is one of a two-level bridge arm, an I-type three-level bridge arm, a T-type three-level bridge arm, a three-bridge arm, or a four-bridge arm. The power devices are one of IGBT or SiC MOSFET. The switch module 102 also includes a drive circuit and a protection circuit. The switch module 102 is prior art and will not be described in detail here.

[0032] In one embodiment of this utility model, the liquid cooling medium 103 is either mineral oil or fluorinated liquid, which ensures that the liquid cooling medium 103 provides insulation and heat dissipation performance, controls the junction temperature of the switching module 102 and the temperature of the inductor module 104, reduces the distance between multiple power devices in the switching module 102, effectively improves the overall power density, and reduces the overall volume of the converter module 1.

[0033] See Figure 2 As shown, the present invention provides an energy storage converter, including a peripheral circuit module 2 and a converter module 1 as described above. The peripheral circuit module 2 is connected to the converter module 1. The peripheral circuit module 2 includes a DC side peripheral circuit 201 and an AC side peripheral circuit 202. The switch module 102 is connected to the DC side peripheral circuit 201 through the housing module 101, and the inductor module 104 is connected to the AC side peripheral circuit 202 through the housing module 101.

[0034] The DC-side peripheral circuit 201 includes a DC-side inductor, a DC-side switch, a DC-side pre-charging circuit, and a fuse, while the AC-side peripheral circuit 202 includes an AC capacitor, a grid-side inductor, an AC-side switch, an AC-side pre-charging circuit, and a fuse. Both the DC-side peripheral circuit 201 and the AC-side peripheral circuit 202 are existing technologies and will not be described in detail here.

[0035] In one embodiment of this utility model, the peripheral circuit module 2 further includes a control circuit board 203, which is connected to the switch module 102, the electronic pump 105, and the temperature sensor. The control circuit board 203 is used to control the start and stop of the electronic pump 105 and to collect the temperature data monitored by the temperature sensor on the liquid cooling medium 103.

[0036] Taking a 400Vac-135kW three-phase three-bridge-arm SiC MOSFET energy storage converter as an example, the liquid cooling medium 103 is a fluorinated liquid with a boiling point of 61℃ and a thermal conductivity of 0.061W / m·K. By using a low-boiling-point coolant, its phase change heat dissipation characteristics can be fully utilized. With the addition of an electronic pump to accelerate the flow, the surface temperature of the power devices can be controlled below 61℃, and the junction temperature can be controlled below 90℃.

[0037] The power devices in the switching module use SiC MOSFETs. Each phase consists of two PWM arms connected in parallel. Each arm includes an upper MOSFET and a lower MOSFET, and the upper and lower MOSFETs are each composed of three SiC MOSFETs connected in parallel. The inductance value L connected to each PWM arm is... f The inductor module has a capacity of 100~200uH and includes multiple inductors connected to the PWM arm. At this time, the DC side capacitor C2 in the DC side peripheral circuit 201 is 1800~3000uF. An electronic pump is used to increase the flow of the insulating cooling liquid in the SiC MOSFET region.

[0038] The dielectric strength at this point is >40kV / 2.54mm, which is more than 10 times that of air dielectric strength (3.0 kV / mm). Therefore, this invention can greatly reduce the insulation distance between conductors.

[0039] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A converter module, characterized in that, include: The system comprises a housing module, a switch module, a liquid cooling medium, and an inductor module; the liquid cooling medium is disposed inside the housing module. The switch module and the inductor module are disposed inside the liquid cooling medium. The switch module is connected to the inductor module, and the housing module is connected to the switch module and the inductor module. The heat generated by the switch module and the inductor module during operation is dissipated sequentially through the liquid cooling medium and the outer casing module.

2. A converter module according to claim 1, characterized in that, The housing module includes a housing and a heat exchanger connected to the outside of the housing. The liquid cooling medium is disposed inside the housing. The housing is connected to the switch module and the inductor module.

3. A converter module according to claim 2, characterized in that, The housing includes a sealed cable connector, which is connected to the switch module and the inductor module.

4. A converter module according to claim 1, characterized in that, It also includes an electronic pump, which is located inside the liquid cooling medium.

5. A converter module according to claim 1, characterized in that, It also includes a temperature sensor, which is located inside the liquid cooling medium.

6. A converter module according to claim 1, characterized in that, The switching module includes a bridge arm unit composed of power devices, wherein the bridge arm unit is one of a two-level bridge arm, an I-type three-level bridge arm, a T-type three-level bridge arm, a three-bridge arm, or a four-bridge arm.

7. A converter module according to claim 6, characterized in that, The power device is either an IGBT or a SiCmoSfet.

8. A converter module according to claim 1, characterized in that, The liquid cooling medium is either mineral oil or fluorinated liquid.

9. An energy storage converter, characterized in that, It includes a peripheral circuit module and a converter module as described in any one of claims 1-6, wherein the peripheral circuit module is connected to the converter module.

10. An energy storage converter according to claim 9, characterized in that, The peripheral circuit module includes a DC-side peripheral circuit and an AC-side peripheral circuit. The switch module is connected to the DC-side peripheral circuit through the housing module, and the inductor module is connected to the AC-side peripheral circuit through the housing module.

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