Temperature sampling circuit

Abstract

The application discloses a temperature sampling circuit for sampling the temperature of a plurality of switch modules in an energy storage converter, comprising a plurality of temperature sensors, a multiplexing module and a control module. The plurality of temperature sensors are electrically connected one-to-one with the plurality of switch modules; a plurality of first-type input terminals of the multiplexing module are electrically connected one-to-one with output terminals of the plurality of temperature sensors; an input terminal of the control module is electrically connected with an output terminal of the multiplexing module, and an output terminal of the control module is electrically connected with a second-type input terminal of the multiplexing module; the multiplexing module is configured to transmit temperature information of a target switch module to the control module in response to a selection instruction of a target channel output by the output terminal of the control module. According to the embodiment of the application, the temperature information of all the switch modules can be collected only by occupying one input terminal (an A / D sampling channel) of the control module, the interface resources and the PCB layout space of the control module are saved, and the cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and in particular relates to a temperature sampling circuit. Background Technology

[0002] With the development of energy storage systems, the power output of individual power conversion systems (PCS) is increasing. Insulated-gate bipolar transistors (IGBTs), as core components of these PCS, are frequently used in parallel. Among the many factors affecting the parallel application of IGBTs, the module temperature has become a major concern for designers. The IGBT module temperature directly impacts the stability and lifespan of the energy storage PCS.

[0003] There are generally two methods for sampling the module temperature of IGBTs in related technologies: one is to use the diode output to the top, but this can only detect the highest temperature of multiple IGBT modules in the energy storage converter, lacking the detection of the temperature of each IGBT module; the other is to connect the temperature sampling of each IGBT module in the energy storage converter to the analog-to-digital (A / D) sampling channel of the microcontroller unit (MCU), which requires a large number of MCU A / D sampling channels, wasting MCU interface resources, and also requires a large printed circuit board (PCB) layout space and has a high cost. Utility Model Content

[0004] This application provides a temperature sampling circuit that can detect the temperature of each switching module (such as the IGBT module in an energy storage converter). It only requires one input terminal (A / D sampling channel) of the control module to collect the temperature information of all switching modules in a time-division manner, saving the interface resources of the control module MCU and PCB layout space, and reducing costs.

[0005] In a first aspect, embodiments of this application provide a temperature sampling circuit for sampling the temperature of multiple switching modules in an energy storage converter. The temperature sampling circuit includes: Multiple temperature sensors are electrically connected to multiple switch modules in a one-to-one correspondence. The temperature sensors are configured to collect and output the temperature information of the corresponding switch modules. The multiplexing module has multiple first-type input terminals that are electrically connected to the output terminals of multiple temperature sensors in a one-to-one correspondence. The control module has its input terminal electrically connected to the output terminal of the multiplexing module, and its output terminal electrically connected to the second type of input terminal of the multiplexing module. The multiplexing module is configured as follows: In response to the target channel selection command output by the output terminal of the control module, the temperature information of the target switch module is transmitted to the control module. The target channel represents the channel where the target switch module is located, and the target switch module is one of multiple switch modules.

[0006] In one possible embodiment of the first aspect, the output of the control module is configured to output the address signal of the channel where the switch module is located; The N output terminals of the control module are electrically connected one-to-one with the N second-type input terminals of the multiplexing module, where N is an integer greater than or equal to 2. The multiplexing module has 2 N A first-class input terminal.

[0007] In one possible embodiment of the first aspect, The first power input terminal of the multiplexing module is electrically connected to the first power signal terminal, and the first power signal terminal is configured with a +5V voltage signal. The first power input terminal of the multiplexing module is also grounded through the first capacitor.

[0008] In one possible embodiment of the first aspect, the temperature sampling circuit further includes: The voltage follower has its non-inverting input electrically connected to the output of the multiplexing module, and its output electrically connected to the input of the control module.

[0009] In one possible embodiment of the first aspect, the temperature sampling circuit further includes: The first filter module is electrically connected to the non-inverting input terminal of the voltage follower; And / or, the second filter module is electrically connected to the input terminal of the control module.

[0010] In one possible embodiment of the first aspect, The first filtering module includes: The first resistor has its first end electrically connected to the output of the multiplexing module and its second end electrically connected to the non-inverting input of the voltage follower. The second capacitor has its first terminal electrically connected to the second terminal of the first resistor, and its second terminal grounded.

[0011] And / or, the second filtering module includes: The second resistor has its first end electrically connected to the output terminal of the voltage follower and its second end electrically connected to the input terminal of the control module. The third capacitor has its first terminal electrically connected to the second terminal of the second resistor, and its second terminal is grounded.

[0012] In one possible embodiment of the first aspect, the temperature sampling circuit further includes: Multiple third resistors are electrically connected to multiple output terminals of the control module, one by one. The first end of the third resistor is electrically connected to the corresponding output terminal of the control module, and the second end of the third resistor is grounded.

[0013] In one possible embodiment of the first aspect, the temperature sampling circuit further includes: Multiple fourth resistors are electrically connected to multiple output terminals of the control module in a one-to-one correspondence. The first end of the fourth resistor is electrically connected to the output terminal of the corresponding control module, and the second end of the fourth resistor is electrically connected to the second type input terminal of the corresponding multiplexing module.

[0014] In one possible embodiment of the first aspect, the temperature sampling circuit further includes: Multiple fifth resistors are electrically connected to the output terminals of multiple temperature sensors in a one-to-one correspondence. The first end of each fifth resistor is electrically connected to the output terminal of each temperature sensor in a one-to-one correspondence. The second end of each fifth resistor is electrically connected to the first type of input terminal of the corresponding multiplexing module.

[0015] In one possible embodiment of the first aspect, the temperature sampling circuit further includes: Multiple fourth capacitors are provided, with their first terminals electrically connected to the multiple output terminals of the control module, and their second terminals grounded.

[0016] This application provides a temperature sampling circuit for sampling the temperature of multiple switching modules in an energy storage converter. The temperature sampling circuit includes multiple temperature sensors, a multiplexing module, and a control module. Each temperature sensor is electrically connected to one of the multiple switching modules, and the temperature sensors collect and output the temperature information of the corresponding switching module. A first-type input terminal of the multiplexing module receives the temperature information collected by the temperature sensors, and the multiple first-type input terminals of the multiplexing module are electrically connected to the output terminals of the multiple temperature sensors. The input terminal of the control module is electrically connected to the output terminal of the multiplexing module, and the output terminal of the control module is electrically connected to a second-type input terminal of the multiplexing module. The second-type input terminal of the multiplexing module receives a selection command from the control module for a target channel (the target channel represents the channel where the target switching module is located), and transmits the temperature information of the target switching module to the control module. The target switch module is one of multiple switch modules, and the target channel is the channel where the target switch module is located. Therefore, the control module can collect the temperature information of all switch modules in a time-sharing manner. It can detect the temperature of each switch module (such as the IGBT module in the energy storage converter), and only needs to occupy one input terminal (A / D sampling channel) of the control module to collect the temperature information of all switch modules in a time-sharing manner, saving MCU interface resources and PCB layout space, and reducing costs. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0018] Figure 1 This is a schematic diagram of a temperature sampling circuit provided in an embodiment of this application; Figure 2 This is another schematic diagram of the temperature sampling circuit provided in the embodiments of this application; Figure 3 This is another schematic diagram of the temperature sampling circuit provided in the embodiments of this application; Figure 4 This is another schematic diagram of the temperature sampling circuit provided in the embodiments of this application. Detailed Implementation

[0019] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0021] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0022] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0023] Before describing the technical solutions provided in the embodiments of this application, in order to facilitate understanding of the embodiments of this application, this application first specifically explains the problems existing in the related technologies: With the development of energy storage systems, the single-unit power of energy storage converters is getting larger and larger.

[0024] The energy storage converter is located between the battery system and the grid, enabling bidirectional energy conversion. Bidirectional energy conversion: During charging, it converts the alternating current (AC) from the grid into direct current (DC) for storage in the battery; during discharging, it converts the direct current (DC) in the battery back into alternating current (AC) to supply the load or feed it into the grid.

[0025] As a core component of energy storage converters, IGBT switching modules are frequently used in parallel. Among the many factors affecting the parallel application of IGBTs, the module temperature is a major concern for designers. The IGBT module temperature directly impacts the stability and lifespan of the energy storage converter.

[0026] There are generally two methods for sampling the module temperature of IGBTs in related technologies: one is to use the diode output to the top, but this can only detect the highest temperature of multiple IGBT modules in the energy storage converter, and lacks the detection of the temperature of each IGBT module; the other is to connect the temperature sampling of each IGBT module in the energy storage converter to the A / D sampling channel of the controller MCU, which requires a large number of MCU A / D sampling channels, wastes a lot of MCU interface resources, and has a large PCB layout space and high cost.

[0027] Based on this, this application provides a temperature sampling circuit that can detect the temperature of each switching module (such as the IGBT module in an energy storage converter), and only requires one input terminal (A / D sampling channel) of the control module to collect the temperature information of all switching modules in a time-division manner, saving the interface resources of the control module MCU and PCB layout space, and reducing costs.

[0028] The temperature sampling circuit provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of a temperature sampling circuit provided in an embodiment of this application, as shown below. Figure 1 As shown, the temperature sampling circuit 100 is used to sample the temperature of multiple switching modules 210 in the energy storage converter 200. The temperature sampling circuit 100 may include multiple temperature sensors 10, a multiplexing module 20, and a control module 30.

[0030] Multiple temperature sensors 10 are electrically connected to multiple switch modules 210 in a one-to-one correspondence. The temperature sensor 10 is configured to collect and output the temperature information of the corresponding switch module 210.

[0031] Among them, the temperature sensor 10 is used to collect and output the temperature information of the corresponding switch module 210.

[0032] The multiple first-type input terminals of the multiplex module 20 are electrically connected one-to-one with the output terminals of the multiple temperature sensors 10.

[0033] The input terminal of the control module 30 is electrically connected to the output terminal of the multiplexing module 20, and its output terminal is electrically connected to the second type of input terminal of the multiplexing module 20.

[0034] The multiplexing module 20 has a first type of input terminal, a second type of input terminal, and an output terminal. The first type of input terminal is used to receive temperature information from the switching module 210 collected by the temperature sensor 10; the second type of input terminal is used to receive control signals (i.e., target channel selection instructions) output by the control module 30; and the output terminal is used to output the temperature information of one switching module 210. The multiplexing module 20 has one output terminal, which is electrically connected to the input terminal (such as the A / D sampling channel) of the control module 30. Therefore, only one input terminal (A / D sampling channel) of the control module 30 needs to be occupied to collect the temperature information of all switching modules 210 in a time-division multiplexing manner.

[0035] For example, the control module 30 may be an EG4X20BG256 MCU, which is merely an example and is not intended to limit this application.

[0036] Multiplexing module 20 is configured as follows: In response to the target channel selection command output by the output terminal of the control module 30, the temperature information of the target switch module is transmitted to the control module 30. The target channel represents the channel where the target switch module is located, and the target switch module is one of multiple switch modules.

[0037] For example, when the control module 30 collects the temperature information of the first switch module 210, it can transmit a selection command for the channel where the first switch module is located to the second type input terminal of the multiplexing module 20. The multiplexing module 20 can respond to the command and output the temperature information of the first switch module to the control module 30. When the control module 30 collects the temperature information of the second switch module 210, it can transmit a selection command for the channel where the second switch module is located to the second type input terminal of the multiplexing module 20. The multiplexing module 20 can respond to the command and output the temperature information of the second switch module to the control module 30. And so on, the control module 30 can collect the temperature information of all switch modules 210 in a time-division manner. It can detect the temperature of each switch module 210 (such as the IGBT module in the energy storage converter), and only needs to occupy one input terminal (A / D sampling channel) of the control module 30 to collect the temperature information of all switch modules 210 in a time-division manner, saving the interface resources of the control module MCU and PCB layout space, and reducing costs.

[0038] According to the temperature sampling circuit 100 provided in this application embodiment, the temperature sampling circuit 100 is used to sample the temperature of multiple switching modules 210 in the energy storage converter 200. The temperature sampling circuit 100 includes multiple temperature sensors 10, a multiplexing module 20, and a control module 30. The multiple temperature sensors 10 are electrically connected to each of the multiple switching modules 210 in a one-to-one correspondence, and the temperature sensors 10 are used to collect and output the temperature information of the corresponding switching module 210. The first type of input terminal of the multiplexing module 20 is used to receive the temperature information collected by the temperature sensors 10, and the multiple first type of input terminals of the multiplexing module 20 are electrically connected to the output terminals of the multiple temperature sensors 10 in a one-to-one correspondence. The input terminal of the control module 30 is electrically connected to the output terminal of the multiplexing module 20, and the output terminal of the control module 30 is electrically connected to the second type of input terminal of the multiplexing module 20. The second type of input terminal of the multiplexing module 20 is used to receive the selection command of the target channel (the target channel represents the channel where the target switching module is located) output by the control module 30, and transmit the temperature information of the target switching module to the control module. The target switch module is one of multiple switch modules 210, and the target channel is the channel where the target switch module is located. Therefore, the control module 30 can collect the temperature information of all switch modules 210 in a time-division manner. It can detect the temperature of each switch module 210 (such as the IGBT module in the energy storage converter), and only needs to occupy one input terminal (A / D sampling pin) of the control module 30 to collect the temperature information of all switch modules 210 in a time-division manner, saving the interface resources and PCB layout space of the control module MCU and reducing the cost.

[0039] In some embodiments, the output of the control module 30 is configured to output the address signal of the channel where the switch module 210 is located.

[0040] The N output terminals of the control module 30 are electrically connected one-to-one with the N second-type input terminals of the multiplexing module 20, where N is an integer greater than or equal to 2.

[0041] Multiplexing module 20 has 2 N A first-class input terminal.

[0042] In one example, such as Figure 2 As shown, N is 2. The two output terminals (DO1, DO2) of the control module 30 are electrically connected to the two second-type input terminals (A, B) of the multiplexing module 20 in a one-to-one correspondence. The output terminals of the control module 30 are configured to output the address signal (such as 00, 01, 10, 11) of the channel where the switch module 210 is located. The multiplexing module 20 has four first-type input terminals (CH0, CH1, CH2, CH3), which can connect to a maximum of four temperature sensors 10, that is, it can detect the temperature information of a maximum of four switch modules 210.

[0043] In yet another example, such as Figure 3 As shown, N is 3. The three output terminals (DO1, DO2, DO3) of the control module 30 are electrically connected one-to-one with the three second-type input terminals (A, B, C) of the multiplexing module 20. The output terminals of the control module 30 are configured to output the address signal of the channel where the switch module 210 is located (e.g., 000, 001, 010, 011, 100, 101, 110, 111). The multiplexing module 20 has eight first-type input terminals (CH0, CH1, ..., CH7), which can connect to a maximum of eight temperature sensors 10, that is, it can detect the temperature information of a maximum of eight switch modules 210. Similarly, if the control module 30 is set with four output terminals, it can detect the temperature information of 16 switch modules 210. The multiplexing module 20 can use an eight-channel multiplexer chip CD4051BM96G4. This model is merely exemplary and is not intended to limit this application.

[0044] The value of N can be flexibly set according to the number of switch modules 210.

[0045] In this embodiment, the value of N can be flexibly set according to the number of switching modules 210 in the energy storage converter 200. Furthermore, since the output of the control module 30 is the address signal of the channel where the switching module 210 is located, the number of switching modules 210 is twice the number of outputs of the control module 30. N This reduces the number of output terminals of the control module 30, significantly reduces the hardware pin occupancy of the control module 30, and reduces the complexity and cost of circuit board wiring.

[0046] Figure 4 This is another schematic diagram of the temperature sampling circuit provided in the embodiments of this application.

[0047] In some embodiments, such as Figure 4 As shown, Figure 4 The medium temperature sampling circuit 100 includes a temperature sensor 10, a multiplexing module 20, a control module 30, and peripheral circuits composed of resistors and capacitors.

[0048] The first power input terminal VDD of the multiplexing module 20 is electrically connected to the first power signal terminal, which is configured with a +5V voltage signal.

[0049] The first power input terminal VDD of the multiplexing module 20 is also grounded through the first capacitor 21.

[0050] Among them, TEMP1~8 are the output signals of the 8-channel temperature sensor 10, CH0~CH7 are the first type of input terminals of the multiplexing module 20, ABC are the second type of input terminals of the multiplexing module 20, MCU_A / D is the input terminal of the control module 30, MCU_DO1~MCU_DO3 are the output terminals of the control module 30, and MCU_DO1~MCU_DO3 are the channel selection signals of the multiplexing module 20, so that the control module 30 samples TEMP1~8 in a round-robin manner. After one round-robin cycle, the control module 30 can sample the temperature data of TEMP1~8 respectively.

[0051] For example, the first capacitor 21 has a specification of 50V-0.1uF.

[0052] It should be noted that when selecting a multiplexer, the signal output of the temperature sensor 10 must not exceed the power supply signal of the multiplexing module 20. For example, if the multiplexing module 20 uses a +5V power supply, the signal voltage of the output signal (TEMP1~8) of the temperature sensor 10 must be less than 5V.

[0053] The multiplexing module 20 in this embodiment of the application can be connected to a +5V standard voltage to ensure that the multiplexing module 20 operates within the appropriate level range, while the grounding capacitor (first capacitor 21) can filter out power fluctuations and high-frequency interference, effectively improving the anti-interference capability and signal stability of the temperature sampling circuit 100.

[0054] In some embodiments, see [link to relevant documentation]. Figure 4 The temperature sampling circuit 100 may also include a voltage follower 40.

[0055] The non-inverting input of voltage follower 40 is electrically connected to the output of multiplexing module 20, and the output of voltage follower 40 is electrically connected to the input of control module 30 (MCU_A / D).

[0056] The voltage follower 40 serves to enhance signal strength. In other words, the output voltage of the voltage follower 40 follows the voltage at the non-inverting input, and the current amplifies the signal, thereby improving the subsequent load-carrying capacity.

[0057] For example, the voltage follower 40 is model SGM8270-2XS8G / TR.

[0058] In this embodiment, a voltage follower 40 is added between the output of the multiplexing module 20 and the input of the control module 30. This can prevent the input impedance of the subsequent circuit (the input of the control module 30, MCU_A / D) from interfering with the signal of the preceding stage. At the same time, the low output impedance of the voltage follower 40 can enhance the signal driving capability and improve the anti-interference performance and temperature measurement accuracy of the temperature sampling circuit 100.

[0059] In some embodiments, see [link to relevant documentation]. Figure 4 The temperature sampling circuit may also include a first filter module 50. The first filter module 50 is electrically connected to the non-inverting input terminal of the voltage follower 40.

[0060] In this embodiment, a first filter module 50 is added between the non-inverting input terminal of the voltage follower 40 and the output terminal of the multiplexing module 20. This can effectively filter out high-frequency noise and transient interference in the output signal of the multiplexing module, smooth the waveform of the temperature sampling signal, and ensure that the signal entering the voltage follower is pure and stable.

[0061] In one example, the first filter module 50 may include a first resistor 51 and a second capacitor 52.

[0062] The first end of the first resistor 51 is electrically connected to the output of the multiplexing module 20, and the second end of the first resistor 51 is electrically connected to the non-inverting input of the voltage follower.

[0063] The first terminal of the second capacitor 52 is electrically connected to the second terminal of the first resistor 51, and the second terminal of the second capacitor 52 is grounded.

[0064] For example, the second capacitor 52 is rated at 50V-1000pF.

[0065] In this embodiment, a first filter module 50 (such as a filter module composed of a first resistor 51 and a second capacitor 52) is added between the non-inverting input terminal of the voltage follower 40 and the output terminal of the multiplexing module 20. This effectively filters out high-frequency noise and transient interference in the output signal of the multiplexing module, smooths the waveform of the temperature sampling signal, and ensures that the signal entering the voltage follower is pure and stable. The cooperation of the first resistor 51 and the second capacitor 52 in the first filter module 50 can suppress signal glitches during power fluctuations or channel switching, improve temperature measurement accuracy and anti-interference capability, and is especially suitable for multi-sensor switching scenarios.

[0066] It should be noted that the filtering structure of the first filtering module 50 can be other than the filtering structure composed of the first resistor 51 and the second capacitor 52, which will not be elaborated here.

[0067] In some embodiments, see [link to relevant documentation]. Figure 4 The temperature sampling circuit may also include a second filtering module 60. The second filtering module 60 is electrically connected to the input terminal of the control module 30.

[0068] This embodiment adds a second filtering module 60 between the output of the voltage follower 40 and the input (MCU_A / D) of the control module 30. The second filtering module 60 performs secondary noise reduction before the signal enters the control module 30, effectively filtering out the high-frequency interference and power supply noise remaining at the output of the voltage follower 40, further smoothing the sampling signal waveform, and ensuring that the temperature data received by the input (MCU_A / D) of the control module 30 is purer and more stable.

[0069] In some embodiments, see [link to relevant documentation]. Figure 4 The second filter module 60 may include a second resistor 61 and a third capacitor 62.

[0070] The first end of the second resistor 61 is electrically connected to the output end of the voltage follower 40, and the second end of the second resistor 61 is electrically connected to the input end of the control module 30.

[0071] The first terminal of the third capacitor 62 is electrically connected to the second terminal of the second resistor 61, and the second terminal of the third capacitor 62 is grounded.

[0072] For example, the third capacitor 62 is rated at 50V-1000pF.

[0073] This embodiment adds a second filter module 60 (such as a filter module composed of a second resistor 61 and a third capacitor 62) between the output of the voltage follower 40 and the input of the control module 30 (MCU_A / D). The second filter module 60 performs secondary noise reduction before the signal enters the control module 30, effectively filtering out high-frequency interference and power supply noise remaining at the output of the voltage follower 40, further smoothing the sampling signal waveform, and ensuring that the temperature data received by the input of the control module 30 (MCU_A / D) is purer and more stable. The second filter module 60, through the cooperation of the second resistor 61 and the third capacitor 62, can suppress transient fluctuations in the signal transmission path, thereby improving the anti-electromagnetic interference capability and measurement accuracy.

[0074] It should be noted that the filtering structure of the second filtering module 60 can be other than the filtering structure composed of the second resistor 61 and the third capacitor 62, which will not be elaborated here.

[0075] In some embodiments, see [link to relevant documentation]. Figure 4 The temperature sampling circuit 100 may also include multiple third resistors 71.

[0076] Multiple third resistors 71 are electrically connected to multiple output terminals of the control module 30 in a one-to-one correspondence. The first end of the third resistor 71 is electrically connected to the corresponding output terminal of the control module 30, and the second end of the third resistor 71 is grounded.

[0077] This embodiment of the application eliminates the floating state of the output terminal of the control module 30 by grounding the pull-down resistor (third resistor 71), which can effectively suppress signal drift caused by external noise or electromagnetic interference and avoid channel switching errors caused by false triggering.

[0078] In some embodiments, see [link to relevant documentation]. Figure 4 The temperature sampling circuit 100 may also include multiple fourth resistors 72.

[0079] Multiple fourth resistors 72 are electrically connected to multiple output terminals of the control module 30 in a one-to-one correspondence. The first end of the fourth resistor 72 is electrically connected to the corresponding output terminal of the control module 30, and the second end of the fourth resistor 72 is electrically connected to the corresponding second type input terminal of the multiplexing module 20.

[0080] In this embodiment of the application, the current output from the output terminal of the control module 30 can be limited by setting a fourth resistor 72, thereby preventing damage to the input terminal of the multiplexing module 20 due to overcurrent.

[0081] It should be noted that using the fourth resistor 72 for current limiting is merely an example, and alternative solutions based on using resistors for current limiting are all within the scope of protection of this application.

[0082] In some embodiments, see [link to relevant documentation]. Figure 4 The temperature sampling circuit 100 may also include multiple fifth resistors 73.

[0083] Multiple fifth resistors 73 are electrically connected to the output terminals of multiple temperature sensors 10 in a one-to-one correspondence. The first end of the multiple fifth resistors 73 is electrically connected to the output terminals of multiple temperature sensors 10 in a one-to-one correspondence. The second end of the fifth resistors 73 is electrically connected to the first type of input terminal of the corresponding multiplexing module 20.

[0084] In this embodiment, by setting a fifth resistor 73, a current-limiting protection link can be established between the output terminal of the temperature sensor 10 and the input terminal of the multiplexing module 20, limiting the transient current at the output terminal of the temperature sensor 10 and preventing the input terminal of the multiplexing module 20 from being damaged due to overcurrent.

[0085] It should be noted that using the fifth resistor 73 for current limiting is merely an example, and alternative solutions based on using resistors for current limiting are all within the scope of protection of this application.

[0086] In some embodiments, see [link to relevant documentation]. Figure 4 The temperature sampling circuit 100 may also include multiple fourth capacitors 80.

[0087] The first terminals of the multiple fourth capacitors 80 are electrically connected to the multiple output terminals of the control module 30 in a one-to-one correspondence, and the second terminals of the multiple fourth capacitors 80 are grounded.

[0088] For example, the fourth capacitor 80 is rated at 50V-1000pF.

[0089] This embodiment of the application can filter out high-frequency interference and power ripple in the output signal of the control module 30 by setting the fourth capacitor 80 to ground path, smooth the waveform of the address signal or control command, and ensure that the channel selection command received by the multiplexing module 20 is pure and stable.

[0090] It should be noted that the temperature sampling circuit 100 in this embodiment is a temperature sampling circuit applied to multiple parallel IGBTs in a centralized energy storage converter PCS. It can solve the problems of not being able to collect real-time temperature data from all IGBT modules during temperature sampling and the resource occupation of the A / D sampling channel of the control module MCU. It can avoid operational failures in the centralized energy storage converter PCS caused by some IGBTs failing to collect data. Specifically, when the centralized energy storage converter PCS is running, the control module 30 continuously sends channel selection signals, causing the channel selection of the multiplexing module 20 to continuously switch between CH0~CH3 (or CH0~CH7). At this time, the control module 30 can collect real-time temperature data from IGBT1~IGBT4 (or IGBT1~IGBT8). In other words, the temperature sampling circuit 100 of this application embodiment enables a single control module MCU's A / D sampling channel in a centralized energy storage converter PCS to sample temperature signals from multiple IGBTs. This saves MCU sampling channel resources while allowing real-time monitoring of the operating temperature of each IGBT in the energy storage PCS. Furthermore, the multiplexing module can use 4-channel, 8-channel, or 16-channel chips to meet the temperature sampling needs of more IGBTs, improving the reliability of the energy storage converter PCS operation.

[0091] Furthermore, it should be noted that in the embodiments shown in the above figures, the resistor is presented as a single resistor, and the capacitor as a single capacitor. In other embodiments, the resistor may be an integration of series, parallel, or mixed resistors, and the capacitor may be an integration of series, parallel, or mixed capacitors.

[0092] It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0093] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A temperature sampling circuit, characterized in that, The temperature sampling circuit is used to sample the temperature of multiple switching modules in an energy storage converter, and includes: Multiple temperature sensors are electrically connected to multiple switch modules in a one-to-one correspondence. The temperature sensors are configured to collect and output the temperature information of the corresponding switch module. The multiplexing module has multiple first-type input terminals that are electrically connected one-to-one with the output terminals of the multiple temperature sensors; The control module has its input terminal electrically connected to the output terminal of the multiplexing module, and its output terminal electrically connected to the second type of input terminal of the multiplexing module. The multiplexing module is configured as follows: In response to the target channel selection command output by the output terminal of the control module, the temperature information of the target switch module is transmitted to the control module. The target channel represents the channel where the target switch module is located, and the target switch module is one of the plurality of switch modules.

2. The temperature sampling circuit according to claim 1, characterized in that, The output of the control module is configured to output the address signal of the channel where the switch module is located; The N output terminals of the control module are electrically connected one-to-one with the N second-type input terminals of the multiplexing module, where N is an integer greater than or equal to 2. The multiplexing module has 2 N The first type of input terminal.

3. The temperature sampling circuit according to claim 2, characterized in that, The first power input terminal of the multiplexing module is electrically connected to the first power signal terminal, and the first power signal terminal is configured with a +5V voltage signal. The first power input terminal of the multiplexing module is also grounded through a first capacitor.

4. The temperature sampling circuit according to claim 1, characterized in that, The temperature sampling circuit also includes: A voltage follower, the non-inverting input of which is electrically connected to the output of the multiplexing module, and the output of which is electrically connected to the input of the control module.

5. The temperature sampling circuit according to claim 4, characterized in that, The temperature sampling circuit also includes: The first filtering module is electrically connected to the non-inverting input terminal of the voltage follower; And / or, the second filtering module is electrically connected to the input terminal of the control module.

6. The temperature sampling circuit according to claim 5, characterized in that, The first filtering module includes: The first resistor has its first end electrically connected to the output terminal of the multiplexing module and its second end electrically connected to the non-inverting input terminal of the voltage follower. The second capacitor has its first terminal electrically connected to the second terminal of the first resistor, and its second terminal grounded. And / or, the second filtering module includes: The second resistor has its first end electrically connected to the output terminal of the voltage follower and its second end electrically connected to the input terminal of the control module. The third capacitor has its first terminal electrically connected to the second terminal of the second resistor, and its second terminal grounded.

7. The temperature sampling circuit according to claim 1, characterized in that, The temperature sampling circuit also includes: Multiple third resistors are provided, and each of the multiple third resistors is electrically connected to a corresponding output terminal of the control module. The first end of each third resistor is electrically connected to the corresponding output terminal of the control module, and the second end of each third resistor is grounded.

8. The temperature sampling circuit according to claim 1, characterized in that, The temperature sampling circuit also includes: Multiple fourth resistors are electrically connected to multiple output terminals of the control module in a one-to-one correspondence. The first end of each fourth resistor is electrically connected to the corresponding output terminal of the control module, and the second end of each fourth resistor is electrically connected to the corresponding second type input terminal of the multiplexing module.

9. The temperature sampling circuit according to claim 1, characterized in that, The temperature sampling circuit also includes: Multiple fifth resistors are electrically connected to the output terminals of multiple temperature sensors in a one-to-one correspondence. The first end of each of the multiple fifth resistors is electrically connected to the output terminals of the multiple temperature sensors in a one-to-one correspondence. The second end of each fifth resistor is electrically connected to the first type of input terminal of the corresponding multiplexing module.

10. The temperature sampling circuit according to any one of claims 1 to 9, characterized in that, The temperature sampling circuit also includes: Multiple fourth capacitors are provided, with their first terminals electrically connected to the multiple output terminals of the control module in a one-to-one correspondence, and their second terminals grounded.

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