Protection circuit and energy storage device

Abstract

The utility model discloses a protection circuit and an energy storage device, the protection circuit comprises a control module, a logic gate module and a driving module, and the logic gate module is connected with the control module and the driving module. The control module is used for sending a control signal and a starting signal; the logic gate module is used for sending a first driving signal according to the opening signal and the control signal; the logic gate module is used for acquiring a feedback signal of the driving module and sending a second driving signal to the driving module according to the feedback signal and the control signal, so that the first power driver and the fourth power driver are turned on, and the second power driver and the third power driver are turned off; the second power driver and the third power driver are turned on, and the first power driver and the fourth power driver are turned off. In the protection circuit, the logic gate module can prevent the two power drivers on the same bridge arm from being switched on at the same time, so that the stability of a circuit system is improved, and the power drivers are protected.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and particularly relates to a protection circuit and an energy storage device. Background Art

[0002] In the related art, during the operation of the MOS tube in the inverter, the driving signal line may be abnormally interfered, resulting in the input of an abnormal driving signal, which may cause the MOS tubes in the upper and lower bridges to be turned on simultaneously, leading to the burning of the MOS tubes, and more seriously, the damage of the device. Summary of the Utility Model

[0003] The embodiments of the utility model provide a protection circuit and an energy storage device to solve at least one of the above-mentioned technical problems.

[0004] A protection circuit according to an embodiment of the utility model includes a control module, a logic gate module, and a driving module. The logic gate module is connected to the control module and the driving module. The driving module includes a driving circuit, an upper bridge arm power driver, and a lower bridge arm power driver. The upper bridge arm power driver and the lower bridge arm power driver are used to connect to a load. The upper bridge arm power driver includes a first power driver and a second power driver. The lower bridge arm power driver includes a third power driver and a fourth power driver;

[0005] The control module is used to issue a control signal and an enabling signal;

[0006] The logic gate module is used to issue a first driving signal according to the enabling signal and the control signal;

[0007] The driving module is used to turn on the first power driver and the fourth power driver or turn on the second power driver and the third power driver according to the first driving signal;

[0008] The logic gate module is used to obtain a feedback signal of the driving module and issue a second driving signal to the driving module according to the feedback signal and the control signal, so as to turn on the first power driver and the fourth power driver, and turn off the second power driver and the third power driver, or turn on the second power driver and the third power driver, and turn off the first power driver and the fourth power driver.

[0009] In the above protection circuit, the logic gate module can, according to the control signal and the feedback signal, turn off the second power driver and the third power driver while turning on the first power driver and the fourth power driver, or turn off the first power driver and the fourth power driver while turning on the second power driver and the third power driver, thereby preventing two power drivers on the same bridge arm from conducting simultaneously, improving the stability of the circuit system, and achieving the protection of the power drivers.

[0010] In some embodiments, the first logic gate module includes a first judgment module, a first pull-up module, and a first pull-down module. The first judgment module is configured to issue a first driving signal according to the control signal and to issue a second driving signal according to the feedback signal and the control signal. The first pull-up module is configured to generate the feedback signal according to the on states of the second power driver and the third power driver. The first pull-down module is configured to generate the feedback signal according to the off states of the second power driver and the third power driver.

[0011] In some embodiments, the first logic gate module includes a first judgment module, a first pull-up module, and a first pull-down module. The first judgment module is configured to issue a driving signal according to the control signal and to perform a logical judgment on the feedback signal and the control signal and issue a driving signal. The first pull-up module is configured to generate the feedback signal according to the on states of the second power driver and the third power driver. The first pull-down module is configured to generate the feedback signal according to the on states of the first power driver and the fourth power driver.

[0012] In some embodiments, the first pull-up module includes a first pull-up resistor, the first pull-up resistor is connected to the control circuit power supply and the first judgment module. The first pull-down module includes a first pull-down resistor and a first diode, and the first judgment module is connected to the first pull-down resistor, the first diode, and the load connection point of the upper bridge arm power driver.

[0013] In some embodiments, the second logic gate module includes a second judgment module, a second pull-up module, and a second pull-down module. The second judgment module is configured to issue a first driving signal according to the control signal and to issue a second driving signal according to the feedback signal and the control signal. The second pull-up module is configured to generate the feedback signal according to the on states of the first power driver and the fourth power driver. The second pull-down module is configured to generate the feedback signal according to the off states of the first power driver and the fourth power driver.

[0014] In some embodiments, the second pull-up module is connected to a second pull-up resistor, the second pull-up resistor is connected to the control circuit power supply and the second judgment module, the second pull-down module includes a second pull-down resistor and a second diode, and the second judgment module is connected to the second pull-down resistor, the second diode and the load connection point of the lower arm power driver.

[0015] In some embodiments, the first power driver, the second power driver, the third power driver, and the fourth power driver include one of a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), a silicon carbide MOS transistor, and a gallium nitride MOS transistor.

[0016] In some embodiments, the first power driver includes a first MOS transistor, the second power driver includes a second MOS transistor, the third power driver includes a third MOS transistor, the fourth power driver includes a fourth MOS transistor. The drain of the first MOS transistor is connected to the drive power supply, the source of the first MOS transistor is connected to the drain of the second MOS transistor, the drain of the third MOS transistor is connected to the drive power supply, and the source of the third MOS transistor is connected to the drain of the fourth MOS transistor. The drive circuit includes a first drive circuit and a second drive circuit. The drive signal of the first logic gate module is sent to the gate of the first MOS transistor through the first drive circuit, the drive signal of the first logic gate module is sent to the gate of the fourth MOS transistor through the second drive circuit, the drive signal of the second logic gate module is sent to the gate of the second MOS transistor through the first drive circuit, and the drive signal of the second logic gate module is sent to the gate of the third MOS transistor through the second drive circuit.

[0017] In some embodiments, the protection circuit further includes a sampling module. The sampling module is connected to the control module and the load, and is used to collect the current flowing through the load. The control module is used to stop sending the control signal when the current in the load circuit is abnormal.

[0018] In some embodiments, the load, the upper arm power driver, the lower arm power driver, and the power supply form a load circuit. The load circuit further includes a detection resistor, and the detection resistor is disposed between the connection point of the upper arm power driver and the lower arm power driver and the ground terminal. The sampling module is used to detect the current flowing through the detection resistor to stop sending the control signal when the current in the load circuit is abnormal.

[0019] In some embodiments, the protection circuit includes a printed circuit board, on which the control module, the logic gate module, and the drive module are mounted, and the distance between the logic gate module and the drive module is less than the distance between the control module and the logic gate module.

[0020] An energy storage device according to an embodiment of the present invention includes the protection circuit according to any one of the above embodiments.

[0021] In the above energy storage device, the logic gate module can, according to a control signal and a feedback signal, turn off the second power driver and the third power driver while turning on the first power driver and the fourth power driver, or turn off the first power driver and the fourth power driver while turning on the second power driver and the third power driver, thereby avoiding simultaneous conduction of two power drivers on the same bridge arm, improving the stability of the circuit system, and achieving protection of the power driver.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0024] Figure 1 is a schematic circuit connection diagram of the protection circuit according to an embodiment of the present invention;

[0025] Figure 2 is another schematic circuit connection diagram of the protection circuit according to an embodiment of the present invention.

[0026] Main Element Symbol Description:

[0027] Protection circuit 10, control module 12, logic gate module 14, drive module 16, drive circuit 18, upper bridge arm power driver 20, lower bridge arm power driver 22, load 24, first power driver 26, second power driver 28, third power driver 30, fourth power driver 32, first logic gate module 34, second logic gate module 36, first judgment module 38, first pull-up module 40, first pull-down module 42, first pull-up resistor 46, first pull-down resistor 48, first diode 50, second judgment module 52, second pull-up module 54, second pull-down module 56, second pull-up resistor 58, second pull-down resistor 60, second diode 62, first drive circuit 64, second drive circuit 66, sampling module 68, detection resistor 70, power supply module 72. Detailed Embodiments

[0028] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0032] The disclosure of the present application provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0033] In the related art, during the operation of the MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) in an inverter, the driving signal line may be affected by a long transmission route of the driving signal or abnormal interference from external signals, resulting in an abnormal driving signal input, which may cause the MOS tubes in the upper and lower bridges to turn on simultaneously.

[0034] When the MOS tubes in the upper and lower bridges turn on simultaneously, the current will directly flow from the positive pole of the power supply through the two simultaneously conducting MOS tubes to the negative pole of the power supply, forming a short circuit. During this process, a large current flows through the MOS tubes, generating a large amount of heat, which may quickly burn out the MOS tubes or even the entire circuit, and more seriously, damage the equipment equipped with the inverter.

[0035] Please refer to Figure 1 , a protection circuit 10 according to an embodiment of the present utility model includes a control module 12, a logic gate module 14, and a driving module 16. The logic gate module 14 is connected to the control module 12 and the driving module 16. The driving module 16 includes a driving circuit 18, an upper-bridge arm power driver 20, and a lower-bridge arm power driver 22. The upper-bridge arm power driver 20 and the lower-bridge arm power driver 22 are used to connect to a load 24. The upper-bridge arm power driver 20 includes a first power driver 26 and a second power driver 28. The lower-bridge arm power driver 22 includes a third power driver 30 and a fourth power driver 32.

[0036] The control module 12 is used to issue a control signal and an enabling signal. The logic gate module 14 is used to issue a first driving signal according to the enabling signal and the control signal. The driving module 16 is used to turn on the first power driver 26 and the fourth power driver 32 or turn on the second power driver 28 and the third power driver 30 according to the first driving signal.

[0037] The logic gate module 14 is used to obtain the feedback signal of the drive module 16 and issue a second drive signal to the drive module 16 according to the feedback signal and the control signal, so as to turn on the first power driver 26 and the fourth power driver 32, and turn off the second power driver 28 and the third power driver 30, or turn on the second power driver 28 and the third power driver 30, and turn off the first power driver 26 and the fourth power driver 32.

[0038] In the above protection circuit 10, the logic gate module 14 can turn off the second power driver 28 and the third power driver 30 while turning on the first power driver 26 and the fourth power driver 32 according to the control signal and the feedback signal, or turn off the first power driver 26 and the fourth power driver 32 while turning on the second power driver 28 and the third power driver 30, thereby avoiding the simultaneous conduction of two power drivers on the same bridge arm, improving the stability of the circuit system, and realizing the protection of the power drivers.

[0039] Specifically, the protection circuit 10 includes a control module 12, a logic gate module 14, and a drive module 16. The control module 12 includes a microcontroller unit (MCU), which can send a control signal and an enabling signal, and realize the switching of the load 24 through the logic gate module 14 and the drive module 16. The enabling signal is an enabling signal issued by the control module 12, which is used to control the opening or closing of the protection circuit 10. The control signal is a set of complementary high and low level digital signals of the control module 12, which is used to control the switching state of the power drivers of the upper and lower bridges. Ensure that when one power driver conducts, the other power driver turns off.

[0040] The logic gate module 14 includes a logic gate circuit, or the logic gate module 14 includes a logic gate chip. After the high and low level signals issued by the control module 12, the logic gate module 14 outputs corresponding signals according to the logic function of the logic gate module 14, so as to realize the control of the drive module 16 to turn on or off the load 24 according to the control signal and the enabling signal.

[0041] The first input terminal is used to receive the input of the enabling signal and the feedback signal, the second input terminal is used to receive the input of the control signal, and the output terminal is used to output a drive signal to the drive module 16. The logic function of the logic gate module 14 is shown in the following table, where L represents low level and H represents high level.

[0042] Table 1. Logic function table of the first input terminal, second input terminal, and output terminal of the logic gate module 14

[0043]

[0044] When the enable signal is at a high level (i.e., the input signal at the first input terminal is at a high level), as shown in the second and fourth rows of the above table, regardless of whether the input signal at the second input terminal is at a high level or a low level, the drive signal output at the output terminal is at a low level, which can turn off the upper bridge arm power driver 20 and the lower bridge arm power driver 22.

[0045] When the enable signal is at a low level (i.e., the input signal at the first input terminal is at a low level), as shown in the first and third rows of the above table, the drive signal output at the output terminal is the same as the input signal at the second input terminal. That is, at this time, a first drive signal can be output according to the input signal at the second input terminal to drive the upper bridge arm power driver 20 and the lower bridge arm power driver 22. After the drive module 16 starts to work, a feedback signal is sent to the first input terminal, and the logic gate module 14 outputs a second drive signal according to the control signal and the feedback signal to drive the upper bridge arm power driver 20 and the lower bridge arm power driver 22.

[0046] The control module 12 sends a first control signal and a second control signal to the second output terminal. The first control signal and the second control signal are a set of complementary high and low level digital signals. Among them, the first control signal is used to drive the first power driver 26 and the fourth power driver 32, and the second control signal is used to drive the second power driver 28 and the third power driver 30. In this way, only one of the power drivers in the upper bridge arm power driver 20 and the lower bridge arm power driver 22 can be turned on.

[0047] When the enable signal is at a low level, the control module 12 sends a first drive signal to the drive module 16 according to the first control signal and the second control signal; after the upper bridge arm power driver 20 and the lower bridge arm power driver 22 are turned on and working, the control module 12 sends a second drive signal to the drive module 16 according to the first control signal and the feedback signal of the lower bridge arm power driver 22, and sends a second drive signal to the drive module 16 according to the second control signal and the feedback signal of the upper bridge arm power driver 20.

[0048] When the first control signal is at a high level and the second control signal is at a low level, the logic gate module 14 outputs a first drive signal at a high level to the first power driver 26 and the fourth power driver 32, and outputs a first drive signal at a low level to the second power driver 28 and the third power driver 30, so as to turn on the first power driver 26 and the fourth power driver 32 and turn off the second power driver 28 and the third power driver 30.

[0049] When the first power driver 26 and the fourth power driver 32 are turned on, the feedback signal obtained by the logic gate module 14 is at a high level, and when the second power driver 28 and the third power driver 30 are turned off, the feedback signal obtained by the logic gate module 14 is at a low level.

[0050] In this way, at this time, the logic gate module 14 controls the first power driver 26 and the fourth power driver 32 according to the first control signal (high level) and the feedback signals (low level) of the second power driver 28 and the third power driver 30. Since the input signal (feedback signal) at the first input terminal is low level, the output terminal signal is the same as the input signal (first control signal) at the second input terminal, that is, the second drive signal sent by the logic gate module 14 to the first power driver 26 and the fourth power driver 32 is high level.

[0051] At the same time, the logic gate module 14 controls the second power driver 28 and the third power driver 30 according to the second control signal (low level) and the feedback signals (high level) of the first power driver 26 and the fourth power driver 32. Since the input signal (feedback signal) at the first input terminal is high level, the output terminal signal has nothing to do with the input signal (second control signal) at the second input terminal, and the output signal of the output terminal is low level, that is, the second drive signal sent by the logic gate module 14 to the second power driver 28 and the third power driver 30 is low level.

[0052] In summary, according to the control signal and the feedback signal, the logic gate module 14 can ensure that when the first power driver 26 and the fourth power driver 32 are turned on, the second power driver 28 and the third power driver 30 are turned off. Similarly, when the second power driver 28 and the third power driver 30 are turned on, the first power driver 26 and the fourth power driver 32 are turned off. This avoids the simultaneous conduction of two power drivers on the same bridge arm, improves the stability of the circuit system, and realizes the protection of the power drivers.

[0053] In some embodiments, the logic gate module 14 includes a first logic gate module 34 and a second logic gate module 36. The first logic gate module 34 is used to send drive signals to the first power driver 26 and the fourth power driver 32 and obtain the feedback signals of the lower-arm power driver 22. The second logic gate module 36 is used to send drive signals to the second power driver 28 and the third power driver 30 and obtain the feedback signals of the upper-arm power driver 20.

[0054] In this way, the first power driver 26 and the fourth power driver 32 can be driven by the first logic gate module 34, and the second power driver 28 and the third power driver 30 can be driven by the second logic gate module 36.

[0055] Specifically, the first logic gate module 34 is used to control the first power driver 26 and the fourth power driver 32 according to the first control signal (high level) and the feedback signals (low level) of the second power driver 28 and the third power driver 30. The second logic gate module 36 is used to control the second power driver 28 and the third power driver 30 according to the second control signal (low level) and the feedback signals (high level) of the first power driver 26 and the fourth power driver 32.

[0056] In one embodiment, the first logic gate module 34 and the second logic gate module 36 are two logic gate chips respectively.

[0057] In some embodiments, the first logic gate module 34 includes a first judgment module 38, a first pull-up module 40 and a first pull-down module 42. The first judgment module 38 is used to issue a first driving signal according to the control signal and a second driving signal according to the feedback signal and the control signal. The first pull-up module 40 is used to generate a feedback signal according to the on states of the second power driver 28 and the third power driver 30. The first pull-down module 42 is used to generate a feedback signal according to the off states of the second power driver 28 and the third power driver 30.

[0058] In this way, the first pull-up module 40 and the first pull-down module 42 can generate feedback signals according to the on / off states of the second power driver 28 and the third power driver 30.

[0059] Specifically, when the second power driver 28 and the third power driver 30 are turned on, a high-level feedback signal is generated through the first pull-up module 40. When the second power driver 28 and the third power driver 30 are turned off, a low-level feedback signal is generated through the first pull-down module 42.

[0060] In some embodiments, the first pull-up module 40 includes a first pull-up resistor 46. The first pull-up resistor 46 is connected to the control circuit power supply and the first judgment module 38. The first pull-down module 42 includes a first pull-down resistor 48 and a first diode 50. The first judgment module 38 is connected to the connection point of the first pull-down resistor 48, the first diode 50 and the load 24 of the upper-bridge-arm power driver 20.

[0061] In this way, the first pull-up module 40 and the first pull-down module 42 can generate feedback signals according to the on / off states of the second power driver 28 and the third power driver 30.

[0062] Specifically, the first pull-up resistor 46 connects the power supply of the logic gate module 14 and the first logic gate module 34. The first input terminal of the first logic gate module 34 is connected to the connection point between the first power driver 26 and the second power driver 28. When the second power driver 28 and the third power driver 30 are turned off, the connection point between the first power driver 26 and the second power driver 28 is at a low level, and the first input terminal is made low level through the first pull-down resistor 48 and the first diode 50, that is, the feedback signal is at a low level.

[0063] When the second power driver 28 and the third power driver 30 are turned on, the connection point between the first power driver 26 and the second power driver 28 is at a high level, and the first input terminal is made high level through the first pull-up resistor 46, that is, the feedback signal is at a high level.

[0064] In some embodiments, the second logic gate module 36 includes a second judgment module 52, a second pull-up module 54, and a second pull-down module 56. The second judgment module 52 is configured to issue a first driving signal according to the control signal and a second driving signal according to the feedback signal and the control signal. The second pull-up module 54 is configured to generate a feedback signal according to the on states of the first power driver 26 and the fourth power driver 32. The second pull-down module 56 is configured to generate a feedback signal according to the off states of the first power driver 26 and the fourth power driver 32.

[0065] In this way, the second pull-up module 54 and the second pull-down module 56 can generate a feedback signal according to the on / off states of the first power driver 26 and the fourth power driver 32.

[0066] Specifically, when the first power driver 26 and the fourth power driver 32 are turned on, a high-level feedback signal is generated through the second pull-up module 54. When the first power driver 26 and the fourth power driver 32 are turned off, a low-level feedback signal is generated through the second pull-down module 56.

[0067] In some embodiments, the second pull-up module 54 is connected to the second pull-up resistor 58. The second pull-up resistor 58 is connected to the control circuit power supply and the second judgment module 52. The second pull-down module 56 includes a second pull-down resistor 60 and a second diode 62. The second judgment module 52 is connected to the second pull-down resistor 60, the second diode 62, and the connection point of the load 24 of the lower-bridge arm power driver 22.

[0068] In this way, the second pull-up module 54 and the second pull-down module 56 can generate a feedback signal according to the on / off states of the first power driver 26 and the fourth power driver 32.

[0069] Specifically, the second pull-up resistor 58 connects the driving power supply of the logic gate module 14 and the second logic gate module 36. The first input terminal of the second logic gate module 36 is connected to the connection point between the third power driver 30 and the fourth power driver 32. When the first power driver 26 and the fourth power driver 32 are turned off, the connection point between the third power driver 30 and the fourth power driver 32 is at a high level, and the first input terminal is at a high level through the second pull-up resistor 58, that is, the feedback signal is at a high level.

[0070] When the first power driver 26 and the fourth power driver 32 are turned on, the connection point between the third power driver 30 and the fourth power driver 32 is at a low level, and the first input terminal is at a low level through the second pull-down resistor 60 and the second diode 62, that is, the feedback signal is at a low level.

[0071] In some embodiments, the first power driver 26, the second power driver 28, the third power driver 30, and the fourth power driver 32 include one of a MOS transistor (Metal-Oxide-Semiconductor Field-Effect Transistor), a silicon carbide MOS transistor, and a gallium nitride MOS transistor.

[0072] In this way, different power devices can be selected according to different requirements for the protection circuit 10.

[0073] Specifically, the silicon carbide MOS transistor has a high current density and can conduct a higher current, thereby increasing the power density of the device. At the same time, its low on-resistance reduces the energy loss and heat during current conduction, which is beneficial to improving the device efficiency and reducing the temperature rise. Applying the silicon carbide MOS transistor enables the protection circuit 10 to be applied to high-temperature and high-power working scenarios.

[0074] The gallium nitride MOS transistor has a very high electron mobility, which makes the electrons in the gallium nitride MOS transistor easier to flow through the material, thereby providing higher conductivity and speed. At the same time, the gallium nitride MOS transistor has a high electron saturation velocity, that is, the speed of electrons no longer increases after reaching the saturation velocity. Therefore, the gallium nitride MOS transistor can provide a higher switching speed and a shorter switching time.

[0075] In some embodiments, the first power driver 26 includes a first MOS transistor, the second power driver 28 includes a second MOS transistor, the third power driver 30 includes a third MOS transistor, and the fourth power driver 32 includes a fourth MOS transistor. The drain of the first MOS transistor is connected to the driving power supply, the source of the first MOS transistor is connected to the drain of the second MOS transistor, the drain of the third MOS transistor is connected to the driving power supply, and the source of the third MOS transistor is connected to the drain of the fourth MOS transistor, as Figure 1 andFigure 2 As shown, the driving circuit 18 includes a first driving circuit 64 and a second driving circuit 66. The driving signal of the first logic gate module 34 is sent to the gate of the first MOS transistor through the first driving circuit 64, and the driving signal of the first logic gate module 34 is sent to the gate of the fourth MOS transistor through the second driving circuit 66. The driving signal of the second logic gate module 36 is sent to the gate of the second MOS transistor through the first driving circuit 64, and the driving signal of the second logic gate module 36 is sent to the gate of the third MOS transistor through the second driving circuit 66.

[0076] In this way, the switch of the load 24 can be driven by turning on and off the MOS transistors.

[0077] Specifically, the driving module 16 includes a first driving circuit 64 and a second driving circuit 66. The first driving circuit 64 is used to connect to the upper-bridge arm power driver 20 to drive the first power driver 26 or the second power driver 28 to work, and the second driving circuit 66 is used to connect to the lower-bridge arm power driver 22 to drive the third power driver 30 or the fourth power driver 32 to work.

[0078] In one embodiment, the protection circuit 10 is as Figure 1 shown. The first driving signal is given to the gate of the first MOS transistor through the first driving circuit 64, and the second driving signal is given to the gate of the second MOS transistor through the first driving circuit 64. The first driving signal is given to the gate of the fourth MOS transistor through the second driving circuit 66, and the second driving signal is given to the gate of the third MOS transistor through the second driving circuit 66.

[0079] The protection current also includes a power supply module 72. The power supply module 72 includes a set of H_VCC power supplies connected to the load 24, a set of 15V driving power supplies connected to the MOS transistors, and a set of 3.3V driving power supplies connected to the control module 12 and the logic gate module 14.

[0080] When the enable signal of the control module 12 is at a high level, the first input terminal of the first logic gate module 34 is made at a high level through the first pull-up resistor 46, and the first input terminal of the second logic gate module 36 is made at a high level through the second pull-up resistor 58. As shown in the logical relationships of the second and fourth rows in Table 1, regardless of whether the first control signal and the second control signal are at a high or low level, the output terminals of the first logic gate module 34 and the second logic gate module 36 both output signals at a low level, and the first MOS transistor to the fourth MOS transistor are driven to turn off through the first logic gate module 34 and the second logic gate module 36, thereby achieving the shutdown of the output signal.

[0081] When the enable signal of the control module 12 is at a low level, the third diode, the third pull-down resistor, the fourth diode, and the fourth pull-down resistor respectively pull down the first input terminals of the first logic gate module 34 and the second logic gate module 36 to a low level. As shown in the logical relationships of the first row and the third row in Table 1, the output terminal of the first logic gate module 34 is in the same state as the second input terminal, and the output terminal of the second logic gate module 36 is in the same state as the second input terminal. The high and low level signals of the first driving signal and the second driving signal are used to drive the first MOS transistor to the fourth MOS transistor through the first logic gate module 34 and the second logic gate module 36, and the MOS transistors in the upper and lower bridge arms achieve a normal switching state.

[0082] In the normal operating state, if the first control signal is at a high level and the first driving signal is also at a high level, and the second control signal is at a low level and the second driving signal is also at a low level, that is, the first MOS transistor and the fourth MOS transistor are turned on, and the second MOS transistor and the third MOS transistor are turned off. At this time, the connection point LV_LLC_HLS between the first power driver 26 and the second power driver 28 is at a high level, and the connection point LV_LLC_HRS between the third power driver 30 and the fourth power driver 32 is at a low level. That is, the first input terminal of the first logic gate module 34 is pulled down to a low level through the first diode 50 and the first pull-down resistor 48. The second logic gate module 36 drives the LV_3V3 of the power supply through the second pull-up resistor 58 to 3.3V to provide a high level to the first input terminal. The first logic gate module 34 operates according to the logical relationships of the first and third rows in Table 1, and the second logic gate module 36 operates according to the logical relationships of the second and fourth rows in Table 1. The current of the load 24 flows from the H_VCC of the power supply through the first MOS transistor, the load 24, the fourth MOS transistor, and the detection resistor 70 to the ground terminal for normal operation.

[0083] If the first control signal is at a low level and the first driving signal is also at a low level, and the second control signal is at a high level and the second driving signal is also at a high level, that is, the first MOS transistor and the fourth MOS transistor are turned off, and the second MOS transistor and the third MOS transistor are turned on, making LV_LLC_HLS at a low level and LV_LLC_HRS at a high level. That is, the first input terminal of the second logic gate module 36 is pulled down to a low level through the second diode 62 and the second pull-down resistor 60. The first logic gate module 34 drives the LV_3V3 of the power supply through the first pull-up resistor 46 to 3.3V to provide a high level to the first input terminal. The second logic gate module 36 operates according to the logical relationships of the first and third rows in Table 1, and the first logic gate module 34 operates according to the logical relationships of the second and fourth rows in Table 1. The current of the load 24 flows from the H_VCC of the power supply through the third MOS transistor, the load 24, the second MOS transistor, and the detection resistor 70 to the ground terminal for normal operation.

[0084] Optionally, as Figure 1As shown, R5 and C5, R13 and C13 in the first logic gate module 34 and the second logic gate module 36 are RC filter circuits, R9 and R15 are pull-down resistors, D2 and D6 are protection diodes, and C2, C8, C14 and C12 are filter capacitors, which play a filtering role.

[0085] Since the driving signal of the control module 12 is relatively weak, and the driving signal travels through the printed circuit board traces to the first logic gate module 34, the second logic gate module 36, and then to the driving module 16, which is very long, it is very likely that the traces are affected by external signals, causing the driving signal to be affected and mutate. The logic gate module 14 can ensure that when the first power driver 26 and the fourth power driver 32 are turned on, the second power driver 28 and the third power driver 30 are turned off according to the control signal and the feedback signal. Similarly, it can ensure that when the second power driver 28 and the third power driver 30 are turned on, the first power driver 26 and the fourth power driver 32 are turned off, which can avoid the MOS transistors of the upper and lower bridges being turned on simultaneously due to a signal mutating from high level to low level or from low level to high level. Thus, the output of the logic gate module 14 can be protected.

[0086] Optionally, the first power driver 26 to the fourth power driver 32 include but are not limited to triodes, MOS transistors, Insulate-Gate Bipolar Transistors (IGBTs), gallium nitride power devices, silicon carbide power devices, relays, and so on.

[0087] In some embodiments, the protection circuit 10 further includes a sampling module 68. The sampling module 68 is connected to the control module 12 and the load 24. The sampling module 68 is used to collect the current flowing through the load 24, and the control module 12 is used to stop sending control signals when the current in the load 24 loop is abnormal.

[0088] In this way, the protection function can be achieved through the sampling module 68.

[0089] Specifically, the sampling module 68 is used to collect the current flowing through the load 24, and the control module 12 is used to stop sending control signals when the current in the load 24 loop is abnormal. In this way, the protection function can be achieved through the sampling module 68 when the current of the load 24 is abnormal.

[0090] In some embodiments, the load 24, the upper-bridge-arm power driver 20, the lower-bridge-arm power driver 22, and the power supply form a load 24 loop. The load 24 loop further includes a sense resistor 70. The sense resistor 70 is disposed between the connection point of the upper-bridge-arm power driver 20 and the lower-bridge-arm power driver 22 and the ground terminal. The sampling module 68 is configured to detect the current flowing through the sense resistor 70 to stop sending the control signal in the case of an abnormal current in the load 24 loop.

[0091] In this way, the current state in the load 24 can be obtained by detecting the current of the sense resistor 70.

[0092] Specifically, when the first control signal, the first drive signal, or the first MOS transistor burns out and conducts, LV_LLC_HLS

[0093] is at a high level, such that the second logic gate module 36 is pulled high to LV_3V3 through the second pull-up resistor 58 to provide a high level to the first input terminal. The second logic gate module 36 operates according to the logic relationships in rows 2 and 4 of Table 1, that is, the second drive signal always outputs a low level, and the second MOS transistor and the third MOS transistor always remain off. The FB_I_OUT of the control module 12 is connected to the sampling circuit. The sampling circuit can only collect the current value at the same bias for the sense resistor 70. At this time, the control module 12 determines it to be abnormal and shuts off the control signal output to achieve a protection function.

[0094] When the second control signal, the second drive signal, or the third MOS transistor burns out and conducts, LV_LLC_HRS is at a high level, such that the first logic gate module 34 is pulled high to LV_3V3 through the first pull-up resistor 46 to provide a high level to the first input terminal. The first logic gate module 34 operates according to the logic relationships in rows 2 and 4 of Table 1, that is, the first drive signal always outputs a low level, and the first MOS transistor and the fourth MOS transistor always remain off. The FB_I_OUT of the control module 12 can only collect the current value at the same bias for the sense resistor 70 through the sampling circuit. At this time, the control module 12 determines it to be abnormal and shuts off the control signal output to achieve a protection function.

[0095] In some embodiments, the protection circuit 10 includes a printed circuit board. The control module 12, the logic gate module 14, and the drive module 16 are mounted on the printed circuit board. The distance between the logic gate module 14 and the drive module is less than the distance between the control module 12 and the logic gate module 14.

[0096] In this way, the transmission of the control signal can be made more stable and reliable.

[0097] Specifically, the distance between the logic gate module 14 and the drive module is less than the distance between the control module 12 and the logic gate module 14, which can significantly reduce the delay of the signal during transmission. Since the signal is transmitted faster when the physical distance is shorter, the response speed and stability of the protection circuit 10 can be improved.

[0098] At the same time, when the distance between the logic gate module 14 and the drive module is closer, the influence of external electromagnetic interference on the signal can be reduced. This is because the noise signal attenuates as the distance increases during transmission. Therefore, setting a short distance can reduce the interference of noise and improve the accuracy of the signal.

[0099] In summary, the protection circuit 10 provided by the present utility model can achieve a turn-off MOS transistor drive signal of less than 10 nanoseconds, protect the MOS transistor from being burned out, and further protect the safe operation of the inverter. Secondly, the impact on cost is extremely low, while the reliability of the product is improved. Finally, the above protection circuit 10 will not burn out the MOS transistor due to abnormal drive signals during software debugging, which can reduce the R & D debugging cost and time and improve the market competitiveness of the product.

[0100] An energy storage device according to an embodiment of the present utility model includes the protection circuit 10 of any of the above embodiments.

[0101] In the above energy storage device, the logic gate module 14 can, according to the control signal and the feedback signal, turn off the second power driver 28 and the third power driver 30 while turning on the first power driver 26 and the fourth power driver 32, or turn off the first power driver 26 and the fourth power driver 32 while turning on the second power driver 28 and the third power driver 30, thereby preventing two power drivers on the same bridge arm from conducting simultaneously, improving the stability of the circuit system, and achieving the protection of the power driver.

[0102] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0103] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A protection circuit, characterized in that, It includes a control module, a logic gate module and a drive module. The logic gate module is connected to the control module and the drive module. The drive module includes a drive circuit, an upper-bridge-arm power driver and a lower-bridge-arm power driver. The upper-bridge-arm power driver and the lower-bridge-arm power driver are used to connect to a load. The upper-bridge-arm power driver includes a first power driver and a second power driver. The lower-bridge-arm power driver includes a third power driver and a fourth power driver; The control module is used to issue a control signal and an enabling signal; The logic gate module is used to issue a first drive signal according to the enabling signal and the control signal; The drive module is used to turn on the first power driver and the fourth power driver or turn on the second power driver and the third power driver according to the first drive signal; The logic gate module is used to obtain a feedback signal of the drive module and issue a second drive signal to the drive module according to the feedback signal and the control signal, so as to turn on the first power driver and the fourth power driver, and turn off the second power driver and the third power driver, or turn on the second power driver and the third power driver, and turn off the first power driver and the fourth power driver.

2. The protection circuit according to claim 1, wherein The logic gate module includes a first logic gate module and a second logic gate module. The first logic gate module is used to send a drive signal to the first power driver and the fourth power driver and obtain a feedback signal of the lower-bridge-arm power driver. The second logic gate module is used to send a drive signal to the second power driver and the third power driver and obtain a feedback signal of the upper-bridge-arm power driver.

3. The protection circuit according to claim 2, characterized in that The first logic gate module includes a first judgment module, a first pull-up module and a first pull-down module. The first judgment module is used to issue a first drive signal according to the control signal and to issue a second drive signal according to the feedback signal and the control signal. The first pull-up module is used to generate the feedback signal according to the on states of the second power driver and the third power driver. The first pull-down module is used to generate the feedback signal according to the off states of the second power driver and the third power driver.

4. The protection circuit according to claim 3, characterized in that, The first pull-up module includes a first pull-up resistor. The first pull-up resistor is connected to a control circuit power supply and the first judgment module. The first pull-down module includes a first pull-down resistor and a first diode. The first judgment module is connected to the first pull-down resistor, the first diode and a load connection point of the upper-bridge-arm power driver.

5. The protection circuit according to claim 2, characterized in that, The second logic gate module includes a second judgment module, a second pull-up module, and a second pull-down module. The second judgment module is configured to issue a first driving signal according to the control signal and issue a second driving signal according to the feedback signal and the control signal. The second pull-up module is configured to generate the feedback signal according to the on states of the first power driver and the fourth power driver. The second pull-down module is configured to generate the feedback signal according to the off states of the first power driver and the fourth power driver.

6. The protection circuit according to claim 5, characterized in that The second pull-up module is connected to a second pull-up resistor. The second pull-up resistor is connected to the control circuit power supply and the second judgment module. The second pull-down module includes a second pull-down resistor and a second diode. The second judgment module is connected to the second pull-down resistor, the second diode, and the load connection point of the lower bridge arm power driver.

7. The protection circuit according to claim 2, characterized in that The first power driver, the second power driver, the third power driver, and the fourth power driver include one of a MOS transistor, a silicon carbide MOS transistor, and a gallium nitride MOS transistor.

8. The protection circuit according to claim 7, wherein The first power driver includes a first MOS transistor, the second power driver includes a second MOS transistor, the third power driver includes a third MOS transistor, and the fourth power driver includes a fourth MOS transistor. The drain of the first MOS transistor is connected to the driving power supply. The source of the first MOS transistor is connected to the drain of the second MOS transistor. The drain of the third MOS transistor is connected to the driving power supply. The source of the third MOS transistor is connected to the drain of the fourth MOS transistor. The driving circuit includes a first driving circuit and a second driving circuit. The driving signal of the first logic gate module is sent to the gate of the first MOS transistor through the first driving circuit. The driving signal of the first logic gate module is sent to the gate of the fourth MOS transistor through the second driving circuit. The driving signal of the second logic gate module is sent to the gate of the second MOS transistor through the first driving circuit. The driving signal of the second logic gate module is sent to the gate of the third MOS transistor through the second driving circuit.

9. The protection circuit according to claim 1, wherein The protection circuit further includes a sampling module. The sampling module is connected to the control module and the load. The sampling module is configured to collect the current flowing through the load. The control module is configured to stop sending the control signal when the current in the load loop is abnormal.

10. The protection circuit according to claim 9, wherein The load, the upper bridge arm power driver, the lower bridge arm power driver, and the power supply form a load loop. The load loop further includes a detection resistor. The detection resistor is disposed between the connection point of the upper bridge arm power driver and the lower bridge arm power driver and the ground terminal. The sampling module is configured to detect the current flowing through the detection resistor to stop sending the control signal when the current in the load loop is abnormal.

11. The protection circuit according to claim 1, characterized in that, The protection circuit includes a printed circuit board, on which the control module, the logic gate module and the drive module are mounted, and the distance between the logic gate module and the drive module is less than the distance between the control module and the logic gate module.

12. An energy storage device, characterized in that, It includes the protection circuit according to any one of claims 1-11.

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