Driving circuit based on thermistor and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supplies, and mainly provides a thermistor-based drive circuit and an energy storage system, the circuit comprises a power device, a drive module and a thermistor; the power device is respectively connected with the thermistor and the driving module, the thermistor is also connected with the driving module, the power device is also used for being connected with a power supply, and the driving module is used for receiving a driving signal; wherein the thermistor is a positive temperature coefficient thermistor. The resistance value of the thermistor responds to the temperature change of the power device; the driving module is used for controlling the conduction speed of the power device based on the real-time resistance value of the thermistor after receiving the driving signal; according to the invention, performance reduction caused by too high temperature of the power device is effectively avoided, and the temperature of the power device can be effectively controlled in a safe range, so that the service life of the power device is prolonged, and the cost is reduced.

Description

Technical field

[0001] The utility model relates to the technical field of energy storage power supplies, and in particular to a thermistor-based drive circuit and an energy storage system. [Background Technology]

[0002] In the design and application of modern power products, field-effect transistors (MOSFETs) and insulated-gate bipolar transistors (IGBTs) are key high-frequency power switching devices and are widely adopted for their outstanding performance. However, in practice, these two devices are often used in parallel to meet specific power requirements. Due to the physical characteristics of these devices, their on-threshold voltage decreases with increasing temperature. This phenomenon can trigger a series of adverse chain reactions. For example, hotter devices turn on earlier, incurring more switching losses, which in turn causes their own temperatures to rise further, further reducing their on-threshold voltage, creating a vicious cycle that is difficult to escape and can ultimately lead to device failure.

[0003] Although the industry has attempted to mitigate this issue, such as optimizing power and drive circuits to ensure consistent switching timing for multiple devices connected in parallel, and placing multiple power devices as close together as possible to keep the temperatures of the parallel devices as close as possible, a significant margin must be reserved for power device selection to achieve a relatively acceptable level of reliability. This not only significantly increases total product costs, but also leaves product reliability unsatisfactory and presents significant challenges for thermal design. Furthermore, IGBTs have the characteristic that their saturation on-state voltage drops as temperature increases, which also contributes to the aforementioned vicious cycle.

[0004] In summary, it is necessary to provide a thermistor-based driving circuit to solve the above technical problems. [Utility Model Content]

[0005] The embodiments of the present utility model provide a thermistor-based drive circuit and an energy storage system, aiming to solve the technical problems of high cost and low reliability of energy storage systems in the prior art.

[0006] In order to solve the above technical problems, a technical solution adopted by the embodiment of the present utility model is: providing a thermistor-based driving circuit, the thermistor-based driving circuit comprising a power device, a driving module and a thermistor;

[0007] The power device is connected to the thermistor and the driving module respectively, the thermistor is also connected to the driving module, the power device is also used to connect to a power supply, and the driving module is used to receive a driving signal;

[0008] The resistance of the thermistor changes in response to the temperature of the power device;

[0009] The driving module is used to control the conduction speed of the power device based on the real-time resistance value of the thermistor after receiving the driving signal, wherein the thermistor is a positive temperature coefficient thermistor.

[0010] Optionally, the conduction speed is inversely proportional to the resistance of the thermistor.

[0011] Optionally, the power device includes a first power device and a second power device, the first power device and the second power device are connected in parallel, the thermistor includes a first thermistor and a second thermistor, and the driving module includes a first driving unit and a second driving unit;

[0012] The first power device is connected to the first thermistor and the first drive unit respectively, the second power device is connected to the second thermistor and the second drive unit respectively, the first drive unit is also connected to the first thermistor, and the second drive unit is also connected to the second thermistor;

[0013] a resistance of the first thermistor responsive to a temperature change of the first power device;

[0014] a resistance of the second thermistor responsive to a temperature change of the second power device;

[0015] The first driving unit is configured to control a conduction speed of the first power device based on a real-time resistance value of the first thermistor after receiving the driving signal;

[0016] The second driving unit is used to control the conduction speed of the second power device based on the real-time resistance value of the second thermistor after receiving the driving signal.

[0017] Optionally, the first driving unit is connected in parallel with the first thermistor, and the second driving unit is connected in parallel with the second thermistor.

[0018] Optionally, the first driving unit includes a resistor R1, a resistor R2 and a diode D1;

[0019] The control end of the first power device is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the controller through the resistor R1, the first end of the resistor R2 is connected to the resistor R1, the second end of the resistor R2 is connected to the control end of the first power device, and the resistor R2 is also connected in parallel with the first thermistor.

[0020] Optionally, the first driving unit includes a resistor R5, a resistor R6 and a diode D3;

[0021] The control end of the first power device is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the controller through the resistor R5, the resistor R6 is connected to the controller and the control end of the first power device respectively, and the resistor R3 is also connected in parallel with the first thermistor.

[0022] Optionally, the first driving unit is connected in series with the first thermistor, and the second driving unit is connected in series with the second thermistor.

[0023] Optionally, the first driving unit includes a resistor R9, a resistor R10 and a diode D5;

[0024] The control end of the first power device is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the controller through the resistor R9, the first end of the resistor R10 is connected to the resistor R9, and the second end of the resistor R10 is connected to the control end of the first power device through the first thermistor.

[0025] Optionally, the driving signal is a pulse signal;

[0026] The driving module is further configured to control the power device to be quickly turned off at the falling edge of the pulse signal.

[0027] In order to solve the above technical problems, another technical solution adopted by the embodiment of the present invention is to provide an energy storage system, which includes:

[0028] Controller;

[0029] Power supply; and

[0030] Thermistor based drive circuit as described above.

[0031] Different from the related art, the present invention provides a thermistor-based drive circuit and energy storage system. The thermistor-based drive circuit includes a power device, a drive module, and a thermistor. The power device is connected to the thermistor and the drive module, respectively. The thermistor is also connected to the drive module. The power device is also used to connect to a power supply, and the drive module is used to receive a drive signal. The thermistor is a positive temperature coefficient thermistor. The resistance of the thermistor responds to the temperature change of the power device. After receiving the drive signal, the drive module is used to control the conduction speed of the power device based on the real-time resistance of the thermistor. This not only effectively avoids the performance degradation caused by the overheating of the power device, but also enables the temperature of the power device to be effectively controlled within a safe range, thereby extending the service life of the power device, thereby improving reliability and reducing costs.

Brief Description of the Drawings

[0032] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0033] Figure 1 This is a structural block diagram of an energy storage system provided by an embodiment of the present utility model;

[0034] Figure 2 The present invention provides a thermistor-based drive circuit.

[0035] Figure 3 This is a circuit diagram of a thermistor-based drive circuit provided by an embodiment of the present utility model;

[0036] Figure 4 This is a circuit diagram of a thermistor-based drive circuit provided by another embodiment of the present utility model;

[0037] Figure 5 This is a circuit diagram of a thermistor-based driving circuit provided by another embodiment of the present utility model;

[0038] Figure 6 This is a circuit diagram of a thermistor-based driving circuit provided by another embodiment of the present invention. [Specific implementation method]

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0041] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0042] The terms "first," "second," and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein. Furthermore, the objects distinguished by "first," "second," and the like are generally of a class, and do not limit the number of objects. For example, the first object may be one or more.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the field of the present invention. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit the present invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0044] See also Figure 1 , Figure 1 This is a structural block diagram of an energy storage system provided by an embodiment of the present utility model. Figure 1 As shown, the energy storage system 100 includes a controller 10, a power supply 20, and a thermistor-based drive circuit 30, wherein the thermistor-based drive circuit 30 is respectively connected to the controller 10 and the power supply 20. The energy storage system 100 also includes a load 40 (not shown), which is connected to the thermistor-based drive circuit 30.

[0045] Specifically, the thermistor-based drive circuit 30 is used to receive the drive signal output by the controller 10, and output the voltage output by the power supply 20 to the load 40 based on the drive signal to power the load 40; or stop outputting the voltage output by the power supply 20 to the load 40 based on the drive signal to stop the load 40 from working.

[0046] Among them, see Figure 2 , Figure 2 The present invention provides a thermistor-based drive circuit. Figure 2As shown, the thermistor-based driving circuit 30 includes a power device 31, a driving module 32 and a thermistor 33;

[0047] The power device 31 is connected to the thermistor 33 and the driving module 32 respectively. The thermistor 33 is also connected to the driving module 32. The power device 31 is also used to connect to the power supply 20. The driving module 32 is used to receive a driving signal.

[0048] The resistance of the thermistor 33 changes in response to the temperature of the power device 31;

[0049] The driving module 32 is configured to control the conduction speed of the power device 31 based on the real-time resistance value of the thermistor 33 after receiving the driving signal, wherein the thermistor 33 is a positive temperature coefficient thermistor.

[0050] Specifically, when the driver module 32 receives the drive signal, it controls the on / off state of the power device 31 based on the drive signal, so that the power supply 20 supplies power to the load 40 or stops supplying power to the load 40 through the power device 31. However, when the power device 31 is turned on based on the drive signal, the temperature of the power device 31 will continue to rise. At this time, because the on-threshold of the power device 31 is closely related to the temperature, when the temperature of the power device 31 rises, the on-threshold of the power device 31 will also decrease, thereby incurring more switching losses, which in turn causes the power device 31 to further increase in temperature and continuously decrease in the on-threshold voltage, resulting in a vicious cycle that is difficult to escape, thereby reducing the reliability of the circuit.

[0051] Therefore, to prevent the impact of temperature on the circuit, a thermistor 33 is introduced. By connecting the thermistor 33 to the power device 31, the resistance value of the thermistor 33 changes with the temperature of the power device 31. Therefore, after the driver module 32 receives the drive signal, it can control the conduction speed of the power device 31 based on the real-time resistance value of the thermistor 33, thereby preventing the impact of temperature on the power device 31 and improving the reliability of the circuit.

[0052] In some embodiments, the conduction speed of the power device 31 is inversely proportional to the resistance of the thermistor 33. Since the thermistor 33 is a positive temperature coefficient thermistor, its resistance increases with increasing temperature. Specifically, due to the junction capacitance of the power device (e.g., an IGBT), the drive signal charges the junction capacitance through the thermistor. When the voltage across the junction capacitance exceeds a conduction threshold, the power device is controlled to conduct. When the temperature of the power device 31 rises, the turn-on threshold of the power device decreases. If a thermistor is not used, the junction capacitance charging speed of the power device remains unchanged regardless of the temperature, and the turn-on speed of the power device increases. In this embodiment, the thermistor 33 is provided. When the temperature of the power device 31 rises, the resistance of the thermistor 33 also increases, which reduces the charge speed of the junction capacitance of the power device. Thus, even if the turn-on threshold of the power device decreases, the turn-on speed of the power device 31 decreases or maintains the turn-on speed at normal temperature, minimizing the effect of temperature on the turn-on speed of the power device. In other words, the turn-on speed of the power device 31 increases as the temperature of the power device 31 increases. It should be noted that when there are two power devices connected in parallel in the thermistor-based drive circuit 30, if the turn-on speed of one power device is faster, the switching loss it suffers will be greater, resulting in a higher temperature of the power device, a lower turn-on threshold, and a further increase in the turn-on speed, thus entering a vicious cycle. In the long run, this will cause the power device to fail. Therefore, in practical applications, the conduction speed of the power device 31 is controlled to extend the service life of the power device 31 , thereby reducing the cost of the circuit.

[0053] In some embodiments, as Figure 2 As shown, the power device 31 includes a first power device 311 and a second power device 312, the first power device 311 and the second power device 312 are connected in parallel, the thermistor 33 includes a first thermistor 331 and a second thermistor 332, and the driving module 32 includes a first driving unit 321 and a second driving unit 322;

[0054] The first power device 311 is connected to the first thermistor 331 and the first driving unit 321 respectively, the second power device 312 is connected to the second thermistor 332 and the second driving unit 322 respectively, the first driving unit 321 is also connected to the first thermistor 331, and the second driving unit 322 is also connected to the second thermistor 332;

[0055] The resistance of the first thermistor 331 changes in response to the temperature of the first power device 311;

[0056] The resistance of the second thermistor 332 changes in response to the temperature of the second power device 312;

[0057] The first driving unit 321 is configured to control the conduction speed of the first power device 311 based on the real-time resistance value of the first thermistor 331 after receiving the driving signal;

[0058] The second driving unit 322 is configured to control a conduction speed of the second power device 312 based on a real-time resistance value of the second thermistor 332 after receiving the driving signal.

[0059] In some embodiments, the controller 10 is respectively connected to the first drive unit 321 and the second drive unit 322. After the controller 10 sends a drive signal to the first drive unit 321 and the second drive unit 322, a first thermistor 331 and a second thermistor 332 are introduced to prevent the influence of temperature on the conduction speed of the first power device 311 and the second power device 312. Therefore, when the temperature of the first power device 311 or the second power device 312 is too high, the conduction speed of the power device with too high temperature is limited by the thermistor, so that the conduction speed of the first power device 311 and the second power device 312 is similar, thereby preventing the power devices from being damaged due to excessive conduction speed. For example, when the temperature of the first power device 311 is too high, the resistance of the first thermistor 331 will also increase. When the first driving unit 321 and the second driving unit 322 receive the driving signal, the first driving unit 321 will reduce the conduction speed of the first power device 311 based on the resistance of the first thermistor 331, so that the conduction speeds of the first power device 311 and the second power device 312 are similar.

[0060] In yet another embodiment, the first driving unit 321 is connected in parallel to the first thermistor 331 , and the second driving unit 322 is connected in parallel to the second thermistor 332 .

[0061] For details, please refer to Figure 3 , Figure 3 This is a circuit diagram of a thermistor-based driving circuit provided by an embodiment of the present utility model. Figure 3 As shown, the first driving unit 321 includes a resistor R1, a resistor R2 and a diode D1; the second driving unit 322 includes a resistor R3, a resistor R4 and a diode D2;

[0062] The control end of the first power device 311 (switch tube Q1) is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the controller 10 through the resistor R1, the first end of the resistor R2 is connected to the resistor R1, the second end of the resistor R2 is connected to the control end of the first power device 311, and the resistor R2 is also connected in parallel with the first thermistor 331 (resistor PTC1).

[0063] The control end of the second power device 312 (switch tube Q2) is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the controller 10 through the resistor R3, the first end of the resistor R4 is connected to the resistor R3, the second end of the resistor R4 is connected to the control end of the second power device 332, and the resistor R4 is also connected in parallel with the second thermistor 332 (resistor PTC2).

[0064] Specifically, when the controller 10 outputs a drive signal (PULSE) to the switches Q1 and Q2, the drive signal is input to the control terminal of the switch Q1 through the resistors R1 and R2; and is input to the control terminal of the switch Q2 through the resistors R3 and R4. At this time, if the temperature of the switch Q1 is too high, the resistance of the resistor PTC1 connected to the switch Q1 will also increase, causing the conduction speed of the switch Q1 to slow down. It should be noted that in a circuit, the resistance of resistors will decrease as they are connected in parallel, and the total resistance of the resistors connected in parallel will approach the resistance of the resistor with the smaller resistance. Therefore, when the temperature of the switch Q1 is normal, the resistance of the resistor PTC1 is relatively low, resulting in a relatively low total resistance after the parallel connection. However, when the temperature of the switch Q1 rises, the resistance of the resistor PTC1 also increases, causing the total resistance after the parallel connection to approach the resistance of the resistor R2. This results in more voltage being consumed when the controller 10 outputs a drive signal, thereby reducing the conduction speed of the switch Q1. For example, when the resistance of the resistor R2 is 200Ω, if the temperature of the switch Q1 is normal, the resistance of the resistor PTC1 is only a few ohms, resulting in a total resistance of only a few ohms. However, when the temperature of the switch Q1 rises rapidly, the resistance of the resistor PTC1 rises to 300 ohms, and the total resistance approaches 200 ohms, thereby reducing the conduction speed of the switch Q1.

[0065] In another embodiment, the driving signal is a pulse signal. At the rising edge of the pulse signal, the first driving unit 321 and the second driving unit 322 control the switching tubes Q1 and Q2 to turn on based on the driving signal. At the falling edge of the pulse signal, the switching tubes Q1 and Q2 are turned off based on the pulse signal. It should be noted that there is junction capacitance in the switching tubes Q1 and Q2. At the rising edge of the pulse signal, the junction capacitance begins to charge based on the rising edge. At the falling edge of the pulse signal, the junction capacitance in the switching tube Q1 discharges to the controller 10 through the diode D1 and the resistor R1, thereby quickly turning off the switching tube Q1. The junction capacitance in the switching tube Q2 also discharges through the diode D2 and the resistor R3, thereby turning off the switching tube Q2.

[0066] In some embodiments, when the temperature of the switch tube Q2 is high, the working principle of the second driving unit 322 is consistent with the working principle of the first driving unit 321 , which will not be described in detail here.

[0067] In yet another embodiment, see Figure 4 , Figure 4 This is a circuit diagram of a thermistor-based driving circuit provided by another embodiment of the present invention, such as Figure 4 As shown, the first driving unit 321 includes a resistor R5, a resistor R6 and a diode D3; the second driving unit 322 includes a resistor R7, a resistor R8 and a diode D4;

[0068] The control end of the first power device 311 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the controller 10 through the resistor R5, the resistor R6 is connected to the controller 10 and the control end of the first power device 311 respectively, and the resistor R3 is also connected in parallel with the first thermistor 331 (PTC3).

[0069] The control end of the second power device 312 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the controller 10 through the resistor R7, the resistor R8 is connected to the controller 10 and the control end of the second power device 312 respectively, and the resistor R8 is also connected in parallel with the second thermistor 332 (PTC4).

[0070] Specifically, after the controller 10 outputs the drive signal, at the rising edge of the drive signal, the resistor R6 is connected in parallel with the resistor PTC3, so that when the temperature of the switch tube Q1 rises, the total parallel resistance becomes larger, thereby limiting the conduction speed of the switch tube Q1, so that the conduction speeds of the switch tube Q1 and the switch tube Q2 are similar.

[0071] It should be noted that the resistance of resistor R5 is much smaller than that of resistor R6. Therefore, during the falling edge of the drive signal, although resistors PTC3, R6, and R5 are connected in parallel, when the temperature of switch Q1 is normal, the total resistance approaches the resistance of resistor PTC3. When the temperature of switch Q1 rises, the total resistance approaches the resistance of resistor R5. Since the resistance of resistor R5 is very small, the turn-off speed of switch Q1 is not affected by the first thermistor 331.

[0072] In some embodiments, the working principle of the second driving unit 322 is consistent with the working principle of the first driving unit 321 , and is not further described here.

[0073] In yet another embodiment, the first driving unit 321 is connected in series with the first thermistor 331 , and the second driving unit 322 is connected in series with the second thermistor 332 .

[0074] For details, please refer to Figure 5 , Figure 5 This is a circuit diagram of a thermistor-based driving circuit provided by another embodiment of the present invention, such as Figure 5 As shown, the first driving unit 321 includes a resistor R9, a resistor R10 and a diode D5; the second driving unit 322 includes a resistor R11, a resistor R12 and a diode D6;

[0075] The control end of the first power device 311 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the controller 10 through the resistor R9, the first end of the resistor R10 is connected to the resistor R9, and the second end of the resistor R10 is connected to the control end of the first power device 311 through the first thermistor 331 (PTC5).

[0076] The control end of the second power device 312 is connected to the anode of the diode D6, the cathode of the diode D6 is connected to the controller 10 through the resistor R11, the first end of the resistor R12 is connected to the resistor R11, and the second end of the resistor R12 is connected to the control end of the second power device 312 through the second thermistor 332 (PTC6).

[0077] Specifically, when the controller 10 outputs a driving signal with a rising edge, the driving signal passes through the resistors R9, R10, and the first thermistor 331 (PTC5) and is output to the switch Q1, thereby controlling the switch Q1 to conduct. It should be noted that in a series circuit, the more series resistors there are, or the greater the resistance of each resistor, the greater the total resistance of the series connection. Therefore, when the temperature of the switch Q1 increases, the resistance of the resistor PTC5 also increases, causing the total resistance to increase, thereby limiting the conduction speed of the switch Q1.

[0078] When the driving signal is at a falling edge, the switch tube Q1 discharges to the controller 10 through the diode D5 and the resistor R9, thereby turning off the switch tube Q1.

[0079] In some embodiments, the working principle of the second driving unit 322 is consistent with the working principle of the first driving unit 321 and will not be discussed here.

[0080] In another embodiment, the thermistor 33 may also be a thermistor with a negative temperature coefficient, that is, the resistance of the thermistor 33 is inversely proportional to the temperature of the power device 31. When the thermistor 33 is a thermistor with a negative temperature coefficient, the thermistor 33 can be used to control the shutdown speed of the power device 31, thereby reducing the heat generated by the power device 31, reducing the heat dissipation requirements, and thus reducing costs.

[0081] In another embodiment, see Figure 6 , Figure 6 Another embodiment of the present invention provides a circuit diagram of a thermistor-based driving circuit, as shown in FIG. Figure 6 As shown, the first driving unit 321 includes a resistor R13, a resistor R14 and a diode D7; the second driving unit 322 includes a resistor R15, a resistor R16 and a diode D8;

[0082] The control end of the first power device 311 is connected to the controller 10 through the resistor R13. The control end of the first power device 311 is also connected to the anode of the diode D7 through the resistor R14. The cathode of the diode D7 is connected to the controller 10. The first thermistor 331 (NTC1) is connected in parallel with the resistor R14.

[0083] The control end of the second power device 312 is connected to the controller 10 through the resistor R15. The control end of the second power device 312 is also connected to the anode of the diode D8 through the resistor R16. The cathode of the diode D8 is connected to the controller 10. The second thermistor 332 (NTC2) is connected in parallel with the resistor R16.

[0084] Specifically, when the driving signal output by the controller 10 reaches a rising edge, the driving signal is input to the control terminal of the switch Q1 through the resistor R13, thereby controlling the switch Q1 to turn on. When the switch Q1 turns on, the temperature of the switch Q1 rises, thereby causing the resistance of the first thermistor 331 to decrease. When the resistance of the first thermistor 331 decreases, the total resistance of the parallel thermistors also decreases, causing the switch Q1 to turn off quickly, thereby reducing the heat generated by the switch Q1.

[0085] It should be noted that the working principle of the second driving unit 322 is the same as that of the first driving unit 321 and will not be discussed here.

[0086] The present invention provides a thermistor-based drive circuit, comprising a power device, a drive module, and a thermistor. The power device is connected to the thermistor and the drive module, respectively. The thermistor is also connected to the drive module. The power device is also connected to a power supply, and the drive module is configured to receive a drive signal. The thermistor is a positive temperature coefficient thermistor. The resistance of the thermistor changes in response to the temperature of the power device. The drive module is configured to control the conduction speed of the power device based on the real-time resistance of the thermistor after receiving the drive signal. This not only effectively avoids performance degradation caused by excessive power device temperature, but also effectively controls the temperature of the power device within a safe range, thereby extending the service life of the power device, improving circuit reliability, and reducing costs.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of this application.

Claims

1. A thermistor-based driving circuit, characterized in that: The thermistor-based driving circuit includes a power device, a driving module and a thermistor; The power device is connected to the thermistor and the driving module respectively, the thermistor is also connected to the driving module, the power device is also used to connect to a power supply, and the driving module is used to receive a driving signal; The resistance of the thermistor changes in response to the temperature of the power device; The driving module is used to control the conduction speed of the power device based on the real-time resistance value of the thermistor after receiving the driving signal, wherein the thermistor is a positive temperature coefficient thermistor.

2. The thermistor-based driving circuit according to claim 1, wherein: The conduction speed is inversely proportional to the resistance value of the thermistor.

3. The thermistor-based driving circuit according to claim 1, wherein: The power device includes a first power device and a second power device, the first power device and the second power device are connected in parallel, the thermistor includes a first thermistor and a second thermistor, and the driving module includes a first driving unit and a second driving unit; The first power device is connected to the first thermistor and the first drive unit respectively, the second power device is connected to the second thermistor and the second drive unit respectively, the first drive unit is also connected to the first thermistor, and the second drive unit is also connected to the second thermistor; a resistance of the first thermistor responsive to a temperature change of the first power device; a resistance of the second thermistor responsive to a temperature change of the second power device; The first driving unit is configured to control a conduction speed of the first power device based on a real-time resistance value of the first thermistor after receiving the driving signal; The second driving unit is configured to control a conduction speed of the second power device based on a real-time resistance value of the second thermistor after receiving the driving signal.

4. The thermistor-based driving circuit according to claim 3, wherein: The first driving unit is connected in parallel to the first thermistor, and the second driving unit is connected in parallel to the second thermistor.

5. The thermistor-based driving circuit according to claim 4, wherein: The first driving unit includes a resistor R1, a resistor R2 and a diode D1; The control end of the first power device is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the controller through the resistor R1, the first end of the resistor R2 is connected to the resistor R1, the second end of the resistor R2 is connected to the control end of the first power device, and the resistor R2 is also connected in parallel with the first thermistor.

6. The thermistor-based driving circuit according to claim 4, wherein: The first driving unit includes a resistor R5, a resistor R6 and a diode D3; The control end of the first power device is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the controller through the resistor R5, the resistor R6 is connected to the controller and the control end of the first power device respectively, and the resistor R3 is also connected in parallel with the first thermistor.

7. The thermistor-based driving circuit according to claim 3, wherein: The first driving unit is connected in series with the first thermistor, and the second driving unit is connected in series with the second thermistor.

8. The thermistor-based driving circuit according to claim 7, wherein: The first driving unit includes a resistor R9, a resistor R10 and a diode D5; The control end of the first power device is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the controller through the resistor R9, the first end of the resistor R10 is connected to the resistor R9, and the second end of the resistor R10 is connected to the control end of the first power device through the first thermistor.

9. The thermistor-based driving circuit according to any one of claims 1 to 8, characterized in that: The driving signal is a pulse signal; The driving module is further configured to control the power device to be quickly turned off at the falling edge of the pulse signal.

10. An energy storage system, characterized in that: The energy storage system comprises: Controller; Power supply; and A thermistor-based drive circuit according to any one of claims 1 to 9.

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