DC / DC module and vehicle

Abstract

The invention discloses a DC / DC module and a vehicle. The DC / DC module comprises a power conversion circuit, an over-current protection circuit, an under-voltage protection circuit, an AND gate circuit and an anti-backflow circuit, the first input end of the overcurrent protection circuit is connected to the first end of the anti-backflow circuit, and the output end of the overcurrent protection circuit is connected to the input end of the power conversion circuit; the input end of the under-voltage protection circuit is connected to the first end of the anti-backflow circuit or the second input end of the over-current protection circuit; the first input end of the AND gate circuit is connected to the output end of the overcurrent protection circuit, the second input end of the AND gate circuit is connected to the output end of the undervoltage protection circuit, and the output end of the AND gate circuit is connected to the second end of the anti-backflow circuit; the output end of the power conversion circuit is connected to the first end of the anti-backflow circuit or the second input end of the overcurrent protection circuit. And the reliability of the anti-backflow circuit is improved.

Description

Technical Field

[0001] This application relates to the technical field of electronic circuits, and particularly to a DC / DC module and a vehicle. Background Art

[0002] With the development of electric vehicles, the reliability requirements for the output terminals of the direct current / direct current (DC / DC) converter module in the vehicle are getting higher and higher. To avoid abnormal operation of the vehicle's low-voltage power supply system caused by abnormalities at the output terminal of the DC / DC module, an anti-backflow circuit can be added to the output terminal of the DC / DC module. The large current caused by an internal short circuit of the DC / DC module is sampled by a current sampling module to disconnect the switch in the anti-backflow circuit and the switching transistor in the DC / DC module.

[0003] However, if the current sampling module malfunctions, it will affect the reliability of the anti-backflow circuit. Summary of the Invention

[0004] Embodiments of this application provide a DC / DC module and a vehicle, which can improve the reliability of the anti-backflow circuit.

[0005] In a first aspect of the embodiments of this application, a DC / DC module is provided, including a power conversion circuit, an overcurrent protection circuit, an undervoltage protection circuit, an AND gate circuit, and an anti-backflow circuit;

[0006] A first input terminal of the overcurrent protection circuit is connected to a first end of the anti-backflow circuit, and an output terminal of the overcurrent protection circuit is connected to an input terminal of the power conversion circuit;

[0007] An input terminal of the undervoltage protection circuit is connected to the first end of the anti-backflow circuit or a second input terminal of the overcurrent protection circuit;

[0008] A first input terminal of the AND gate circuit is connected to the output terminal of the overcurrent protection circuit, a second input terminal of the AND gate circuit is connected to the output terminal of the undervoltage protection circuit, and an output terminal of the AND gate circuit is connected to a second end of the anti-backflow circuit; an output terminal of the power conversion circuit is connected to the first end of the anti-backflow circuit or the second input terminal of the overcurrent protection circuit;

[0009] When the DC / DC module is in a fault state or a normal state, the undervoltage protection circuit outputs a first signal or a second signal, the overcurrent protection circuit outputs a first signal or a second signal, and the AND gate circuit outputs a first signal or a second signal to control the anti-backflow circuit to be disconnected or closed.

[0010] In the embodiments of the present application, in the case where the DC / DC module fails, at least one of the undervoltage protection circuit and the overcurrent protection circuit outputs a first signal to control the anti-backflow circuit to disconnect, thereby improving the reliability of the anti-backflow circuit. In addition, the undervoltage protection circuit does not turn off the switch in the power conversion circuit, thereby ensuring the normal power-on of the DC / DC module.

[0011] Among them, the undervoltage protection circuit outputs a first signal, indicating that the output of the DC / DC module is in an undervoltage state, and the undervoltage state is a state where the output voltage of the DC / DC module is lower than the normal voltage.

[0012] The overcurrent protection circuit outputs a first signal, indicating that the output of the DC / DC module is in an overcurrent state, and the overcurrent state is a state where the output current of the DC / DC module is higher than the normal current.

[0013] Both the undervoltage state and the overcurrent state are abnormal states of the DC / DC module. When detecting the undervoltage state or the overcurrent state, the switch in the anti-backflow circuit can be controlled to turn off, thereby preventing the abnormal state of the DC / DC module from affecting the low-voltage module.

[0014] The low-voltage module can be a low-voltage battery. For example, the low-voltage battery can be a 12V or 24V or 48V storage battery.

[0015] Optionally, both the first signal and the second signal are level signals, and the level signal of the first signal is lower than the level signal of the second signal.

[0016] Among them, the first signal can be a low level, and the second signal can be a high level. Optionally, the undervoltage protection circuit is further configured to output a second signal when detecting that the voltage at the first end of the sampling resistor is greater than the first voltage threshold or the voltage at the second input end of the overcurrent protection circuit is greater than the first voltage threshold;

[0017] The overcurrent protection circuit is further configured to output a second signal when detecting that the output current of the DC / DC module is less than the first current threshold;

[0018] The AND gate circuit is configured to output a second signal to control the closing of the switch in the anti-backflow circuit when the second signal output by the undervoltage protection circuit and the second signal output by the overcurrent protection circuit are output.

[0019] In the embodiments of the present application, the undervoltage protection circuit outputs a second signal, indicating that the output of the DC / DC module is in a normal voltage state, and the normal voltage state is a state where the output voltage of the DC / DC module is the normal voltage.

[0020] The overcurrent protection circuit outputs a second signal, indicating that the output of the DC / DC module is in a normal current state, and the normal current state is a state where the output current of the DC / DC module is a normal current.

[0021] Both the normal voltage state and the normal current state are normal states of the DC / DC module. When the normal voltage state and the normal current state are detected, the switch in the anti-backflow circuit can be controlled to conduct, thereby allowing the DC / DC module to supply power to the low-voltage module.

[0022] Optionally, the undervoltage protection circuit includes a first comparator. The non-inverting input terminal of the first comparator is connected to the first end of the anti-backflow circuit or the second input terminal of the overcurrent protection circuit. The voltage at the inverting input terminal of the first comparator is a first reference voltage, and the output terminal of the first comparator is connected to the second input terminal of the AND gate circuit;

[0023] The first comparator is configured to output a first signal when the voltage at the first end of the anti-backflow circuit is less than the first reference voltage or the voltage at the second input terminal of the overcurrent protection circuit is less than the first reference voltage;

[0024] The first comparator is further configured to output a second signal when the voltage at the first end of the anti-backflow circuit is greater than the first reference voltage or the voltage at the second input terminal of the overcurrent protection circuit is greater than the first reference voltage.

[0025] Optionally, the overcurrent protection circuit includes a second comparator, a sampling resistor, and a differential operational amplifier. The non-inverting input terminal of the differential operational amplifier is connected to the first end of the sampling resistor, the inverting input terminal of the differential operational amplifier is connected to the second end of the sampling resistor. The first end of the sampling resistor is connected to the output terminal of the power conversion circuit, the second end of the sampling resistor is connected to the first end of the anti-backflow circuit, the output terminal of the differential operational amplifier is connected to the non-inverting input terminal of the second comparator, and the voltage at the inverting input terminal of the second comparator is a second reference voltage; the output terminal of the second comparator is connected to the control terminal of the power conversion circuit and the first input terminal of the AND gate circuit.

[0026] Optionally, the differential operational amplifier is configured to output a first voltage to the non-inverting input terminal of the second comparator according to the voltage difference between the first end and the second end of the sampling resistor;

[0027] The second comparator is configured to output a second signal when the first voltage is less than the second reference voltage;

[0028] The second comparator is further configured to output a first signal when the first voltage is greater than the second reference voltage.

[0029] Optionally, the anti-backflow circuit includes an anti-backflow switch and an anti-backflow diode. The positive electrode of the anti-backflow diode is connected to the first end of the anti-backflow switch and the first end of the anti-backflow circuit, and the negative electrode of the anti-backflow diode is connected to the second end of the anti-backflow switch and the power supply terminal of the low-voltage module.

[0030] Optionally, the DC / DC module further includes a control module. The output terminal of the overcurrent protection circuit is connected to the first input terminal of the control module, and the output terminal of the undervoltage protection circuit is connected to the second input terminal of the control module.

[0031] Optionally, in the first stage when the DC / DC module is powered on, the voltage at the output terminal of the power conversion circuit is less than the first voltage threshold, and the undervoltage protection circuit outputs a first signal to control the switch in the anti-backflow circuit to turn off;

[0032] In the second stage when the DC / DC module is powered on, the voltage at the output terminal of the power conversion circuit is greater than the first voltage threshold, and the undervoltage protection circuit outputs a second signal to control the switch in the anti-backflow circuit to close.

[0033] Optionally, when the output terminal of the DC / DC module is short-circuited, the overcurrent protection circuit detects that the current of the sampling resistor is greater than the first current threshold, and the overcurrent protection circuit outputs a first signal to control the switch in the anti-backflow circuit to turn off.

[0034] A second aspect of the embodiments of the present application provides a vehicle, including the DC / DC module, the high-voltage module, and the low-voltage module according to any one of the first aspect of the embodiments of the present application. The input terminal of the DC / DC module is connected to the high-voltage module, and the output terminal of the DC / DC module is connected to the low-voltage module. Among them, the high-voltage module may include a high-voltage battery. For example, the voltage of the high-voltage battery can reach hundreds of volts. Exemplarily, the high-voltage battery may be the power battery of the vehicle (for example, a lithium battery). The low-voltage module may be a low-voltage battery. For example, the low-voltage battery may be a 12V or 24V or 48V storage battery on the vehicle.

[0035] For the DC / DC module of the embodiments of the present application, when a fault occurs in the DC / DC module, at least one of the undervoltage protection circuit and the overcurrent protection circuit outputs a first signal to control the anti-backflow circuit to disconnect, thereby improving the reliability of the anti-backflow circuit. In addition, the undervoltage protection circuit will not turn off the switch in the power conversion circuit, thereby ensuring the normal power-on of the DC / DC module. Description of the Drawings

[0036] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0037] Figure 1 is a schematic structural diagram of a DC / DC module provided by an embodiment of the present application;

[0038] Figure 2 is a schematic structural diagram of another DC / DC module provided by an embodiment of the present application;

[0039] Figure 3 is a schematic structural diagram of yet another DC / DC module provided by an embodiment of the present application;

[0040] Figure 4 is a schematic structural diagram of a vehicle provided by an embodiment of the present application. Detailed implementation manners

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope protected by the present application.

[0042] The terms "first", "second", etc. in the specification and claims of the present application and the above accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, products, or devices.

[0043] Referring to "embodiment" in the present application means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0044] Please refer to Figure 1 , Figure 1It is a schematic structural diagram of a DC / DC module provided by an embodiment of the present application. As Figure 1 shown, the DC / DC module 100 includes a power conversion circuit 10, an overcurrent protection circuit 20, an undervoltage protection circuit 30, an AND gate circuit 40, and an anti-backflow circuit 50; a first input end of the overcurrent protection circuit 20 is connected to a first end of the anti-backflow circuit 50, and an output end of the overcurrent protection circuit 20 is connected to an input end of the power conversion circuit 10; an input end of the undervoltage protection circuit 30 is connected to the first end of the anti-backflow circuit 50 or a second input end of the overcurrent protection circuit 20; a first input end of the AND gate circuit 40 is connected to the output end of the overcurrent protection circuit 20, a second input end of the AND gate circuit 40 is connected to the output end of the undervoltage protection circuit 30, and an output end of the AND gate circuit 40 is connected to a second end of the anti-backflow circuit 50; an output end of the power conversion circuit 10 is connected to the first end of the anti-backflow circuit 50 or the second input end of the overcurrent protection circuit 20;

[0045] When the DC / DC module 100 is in a fault state or a normal state, the undervoltage protection circuit 30 outputs a first signal or a second signal, the overcurrent protection circuit 20 outputs a first signal or a second signal, and the AND gate circuit 40 outputs a first signal or a second signal to control the anti-backflow circuit 50 to be disconnected or closed.

[0046] The undervoltage protection circuit 30 outputs a first signal, indicating that the output of the DC / DC module 100 is in an undervoltage state, and the undervoltage state is a state where the output voltage of the DC / DC module 100 is lower than the normal voltage.

[0047] The overcurrent protection circuit 20 outputs a first signal, indicating that the output of the DC / DC module 100 is in an overcurrent state, and the overcurrent state is a state where the output current of the DC / DC module 100 is higher than the normal current.

[0048] Both the undervoltage state and the overcurrent state are abnormal states of the DC / DC module 100. When detecting the undervoltage state or the overcurrent state, the switch in the anti-backflow circuit 50 can be controlled to turn off, thereby preventing the abnormal state of the DC / DC module 100 from affecting the low-voltage module.

[0049] The low-voltage module can be a low-voltage battery. For example, the low-voltage battery can be a 12V or 24V or 48V storage battery.

[0050] Wherein, the first signal can be a low level, and the second signal can be a high level.

[0051] In the embodiment of the present application, when the DC / DC module 100 fails, at least one of the undervoltage protection circuit 30 and the overcurrent protection circuit 20 outputs a first signal to control the anti-backflow circuit 50 to disconnect, thereby improving the reliability of the anti-backflow circuit 50. In addition, the undervoltage protection circuit 30 does not turn off the switch in the power conversion circuit 10, thereby ensuring the normal power-on of the DC / DC module 100.

[0052] Optionally, the undervoltage protection circuit 30 is further configured to output a second signal when it detects that the voltage at the first end of the anti-backflow circuit 50 is greater than a first voltage threshold or the voltage at the second input end of the overcurrent protection circuit 20 is greater than the first voltage threshold;

[0053] The overcurrent protection circuit 20 is further configured to output a second signal when it detects that the output current of the DC / DC module 100 is less than a first current threshold;

[0054] The AND gate circuit 40 is configured to output a second signal to control the closing of the switch in the anti-backflow circuit 50 when the second signal output by the undervoltage protection circuit 30 and the second signal output by the overcurrent protection circuit 20 are output;

[0055] In the embodiment of the present application, the undervoltage protection circuit 30 outputs a second signal, indicating that the output of the DC / DC module 100 is in a normal voltage state, and the normal voltage state is a state where the output voltage of the DC / DC module 100 is a normal voltage.

[0056] The overcurrent protection circuit 20 outputs a second signal, indicating that the output of the DC / DC module 100 is in a normal current state, and the normal current state is a state where the output current of the DC / DC module 100 is a normal current.

[0057] Both the normal voltage state and the normal current state are normal states of the DC / DC module 100. When the normal voltage state and the normal current state are detected, the switch in the anti-backflow circuit 50 can be controlled to conduct, thereby allowing the DC / DC module 100 to supply power to the low-voltage module.

[0058] Among them, the second signal may include a high level. Please refer to Figure 2 , Figure 2 is a schematic structural diagram of another DC / DC module provided by the embodiment of the present application. As Figure 2 shown, the undervoltage protection circuit 30 includes a first comparator 31. The non-inverting input terminal of the first comparator 31 is connected to the second input terminal of the overcurrent protection circuit 20. The voltage at the inverting input terminal of the first comparator 31 is a first reference voltage. The output terminal of the first comparator 31 is connected to the second input terminal of the AND gate circuit 40;

[0059] The first comparator 31 is configured to output a first signal when the voltage at the second input terminal of the overcurrent protection circuit 20 is less than the first reference voltage;

[0060] The first comparator 31 is further configured to output a second signal when the voltage at the second input terminal of the current protection circuit 20 is greater than the first reference voltage.

[0061] The first reference voltage is a preset voltage. Exemplarily, when the supply voltage of the low-voltage module is 12V, the first reference voltage can be set to any value between 2V and 10V.

[0062] Wherein, the first reference voltage can be obtained through a first reference voltage source (for example, the inverting input terminal of the first comparator 31 is directly connected to the first reference voltage source), or the first reference voltage can be obtained through a first reference voltage source and a first voltage dividing circuit (for example, the first voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor, the inverting input terminal of the first comparator 31 is connected to the first end of the first voltage dividing resistor and the second end of the second voltage dividing resistor, the first end of the second voltage dividing resistor is connected to the first reference voltage source, and the second end of the first voltage dividing resistor is grounded). For example, the first reference voltage source can be a 3.3V voltage source or a 5V voltage source.

[0063] Optionally, the power supply terminal of the first comparator 31 can be powered by the low-voltage module, and the ground terminal of the first comparator 31 is grounded.

[0064] Optionally, as Figure 2 shown, the overcurrent protection circuit 20 includes a second comparator 21, a sampling resistor R1, and a differential operational amplifier 22. The non-inverting input terminal of the differential operational amplifier 22 is connected to the first end of the sampling resistor R1, the inverting input terminal of the differential operational amplifier 22 is connected to the second end of the sampling resistor R1, the first end of the sampling resistor R1 is connected to the output terminal of the power conversion circuit 10, the second end of the sampling resistor R1 is connected to the first end of the anti-backflow circuit 50, the output terminal of the differential operational amplifier 22 is connected to the non-inverting input terminal of the second comparator 21, and the voltage at the inverting input terminal of the second comparator 21 is the second reference voltage; the output terminal of the second comparator 21 is connected to the control terminal of the power conversion circuit 10 and the first input terminal of the AND gate circuit 40.

[0065] The differential operational amplifier 22 is configured to output a first voltage to the non-inverting input terminal of the second comparator 21 according to the voltage difference between the first end and the second end of the sampling resistor R1;

[0066] The second comparator 21 is configured to output a second signal when the first voltage is less than the second reference voltage;

[0067] The second comparator 21 is further configured to output a first signal when the first voltage is greater than the second reference voltage.

[0068] Wherein, when the current flowing through the sampling resistor R1 is greater than the first current threshold, the voltage difference between the non-inverting input terminal and the inverting input terminal of the differential operational amplifier 22 is relatively large, the first voltage output by the differential operational amplifier 22 is greater than the second reference voltage, so that the second comparator 21 outputs a first signal, thereby controlling the turn-off of the switch in the anti-backflow circuit 50.

[0069] Wherein, the current direction of the sampling resistor R1 may be from the anti-backflow circuit 50 to the power conversion circuit 10.

[0070] When the current flowing through the sampling resistor R1 is less than the first current threshold, the voltage difference between the non-inverting input terminal and the inverting input terminal of the differential operational amplifier 22 is relatively small, the first voltage output by the differential operational amplifier 22 is less than the second reference voltage, so that the second comparator 21 outputs a second signal.

[0071] The second reference voltage is a preset voltage. Exemplarily, when the supply voltage of the low-voltage module is 12V, the second reference voltage can be set to any value between 1V and 8V.

[0072] The second reference voltage may be equal to or different from the first reference voltage. Exemplarily, the second reference voltage is less than the first reference voltage.

[0073] Wherein, the second reference voltage can be obtained through a second reference voltage source (for example, the inverting input terminal of the first comparator 31 is directly connected to the second reference voltage source), or the second reference voltage can be obtained through a second reference voltage source and a second voltage-dividing resistor (for example, the second voltage-dividing circuit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor, the inverting input terminal of the second comparator 21 is connected to the first end of the third voltage-dividing resistor and the second end of the fourth voltage-dividing resistor, the first end of the fourth voltage-dividing resistor is connected to the second reference voltage source, and the second end of the third voltage-dividing resistor is grounded). For example, the second reference voltage source can be a 3.3V voltage source or a 5V voltage source. The second reference voltage source and the first reference voltage source may be equal or different.

[0074] Optionally, the power supply terminal of the second comparator 21 can be powered by the low-voltage module, and the ground terminal of the second comparator 21 is grounded.

[0075] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of another DC / DC module provided by an embodiment of the present application. As Figure 3As shown, the anti-backflow circuit 50 includes an anti-backflow switch Q1 and an anti-backflow diode D1. The positive electrode of the anti-backflow diode D1 is connected to the first end of the anti-backflow switch Q1 and the second end of the sampling resistor R1, and the negative electrode of the anti-backflow diode D1 is connected to the second end of the anti-backflow switch Q1 and the power supply terminal of the low-voltage module.

[0076] The anti-backflow switch Q1 can be any one of a power electronic switch, a relay, and a field effect transistor (FET). The field effect transistor can include a metal-oxide-semiconductor field-effect transistor (MOSFET), and the MOSFET can be abbreviated as a MOS transistor. If the MOS transistor is an NMOS transistor, the anti-backflow switch Q1 can be closed at a high level and turned off at a low level. If the MOS transistor is a PMOS transistor, the anti-backflow switch Q1 can be closed at a low level and turned off at a high level. Figure 3 The anti-backflow switch Q1 of [description] is described by taking the PMOS transistor as an example. Figure 3 The diode connected in parallel with the PMOS transistor in [description] is the anti-backflow diode D1, and the anti-backflow diode D1 can be the parasitic diode of the PMOS transistor. The control terminal of the anti-backflow circuit 50 can be the gate of the PMOS transistor, the first end of the anti-backflow circuit 50 can be the drain of the PMOS transistor, and the second end of the anti-backflow circuit 50 can be the source of the PMOS transistor.

[0077] Optionally, as Figure 2 or Figure 3 shown, the DC / DC module 100 further includes a control module 60. The output terminal of the overcurrent protection circuit 20 is connected to the first input terminal of the control module 60, and the output terminal of the undervoltage protection circuit 30 is connected to the second input terminal of the control module 60.

[0078] Among them, the output terminal of the control module 60 is connected to the input terminal of the vehicle controller, and the output terminal of the vehicle controller is connected to the second end of the anti-backflow circuit 50.

[0079] The control module 60 can control the closing or opening of the switch in the power conversion circuit 10. The control module 60 can also control the closing or opening of the anti-backflow switch Q1.

[0080] Exemplarily, when the first signal is output at the output end of the overcurrent protection circuit 20, the control module 60 can control the switch in the power conversion circuit 10 to turn off, and the control module 60 can control the anti-backflow switch Q1 to turn off. When the first signal is output at the output end of the undervoltage protection circuit 30, the control module 60 can control the anti-backflow switch Q1 to turn off. It should be noted that when the first signal is output at the output end of the undervoltage protection circuit 30, it may be the initial stage when the DC / DC module 100 is normally powered on. If the control module 60 controls the switch in the power conversion circuit 10 to turn off, it will cause the DC / DC module 100 to have no output. To avoid the above problems, when the first signal is output at the output end of the undervoltage protection circuit 30, the control module 60 will not control the switch in the power conversion circuit 10 to turn off.

[0081] Optionally, in the first stage when the DC / DC module 100 is powered on, the voltage at the output end of the power conversion circuit 10 is less than the first voltage threshold, and the undervoltage protection circuit 30 outputs a first signal to control the switch in the anti-backflow circuit 50 to turn off;

[0082] In the second stage when the DC / DC module 100 is powered on, the voltage at the output end of the power conversion circuit 10 is greater than the first voltage threshold, and the undervoltage protection circuit 30 outputs a second signal to control the switch in the anti-backflow circuit 50 to close.

[0083] In the embodiment of the present application, in the first stage when the DC / DC module 100 is powered on, the voltage at the output end of the power conversion circuit 10 is less than the first voltage threshold. At this time, the undervoltage protection circuit 30 outputs a first signal to control the switch in the anti-backflow circuit 50 to turn off, and will not control the switch in the power conversion circuit 10 to turn off, which can ensure the normal output of the DC / DC module 100 and does not affect the normal output of the DC / DC module 100. In the second stage when the DC / DC module 100 is powered on, the voltage at the output end of the power conversion circuit 10 is greater than the first voltage threshold, and it is considered that the voltage at the output end of the power conversion circuit 10 is a normal voltage. At this time, the undervoltage protection circuit 30 outputs a second signal to control the switch in the anti-backflow circuit 50 to close.

[0084] Optionally, when the output end of the DC / DC module 100 is short-circuited, the overcurrent protection circuit 20 detects that the current of the sampling resistor R1 is greater than the first current threshold, and the overcurrent protection circuit 20 outputs a first signal to control the switch in the anti-backflow circuit 50 to turn off.

[0085] In the embodiment of the present application, when the output terminal of the DC / DC module 100 is short-circuited, the overcurrent protection circuit 20 detects that the current of the sampling resistor R1 is greater than the first current threshold, and the overcurrent protection circuit 20 outputs a first signal, thereby controlling the turn-off of the anti-reverse switch and controlling the turn-off of the switch in the power conversion circuit 10, avoiding the short circuit of the output terminal of the DC / DC module 100 from the source, and thus improving the safety.

[0086] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of a vehicle provided by an embodiment of the present application. As Figure 4 shown, the vehicle may include a DC / DC module 100, a high-voltage module 200, and a low-voltage module 300. Among them, the high-voltage module 200 may include a high-voltage battery. For example, the voltage of the high-voltage battery may reach hundreds of volts. Exemplarily, the high-voltage battery may be a power battery of the vehicle (such as a lithium battery). The low-voltage module 300 may be a low-voltage battery. For example, the low-voltage battery may be a 12V or 24V or 48V storage battery on the vehicle. The vehicle may be an electric vehicle or a hybrid vehicle.

[0087] Figure 4 For the specific structure and working principle of the DC / DC module 100 in

[0088] the above, reference may be made to the above embodiments, and details are not described herein again.

[0089] In several embodiments provided by the present application, it should be understood that the disclosed DC / DC module and vehicle can be implemented in other ways. For example, the DC / DC module embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

Claims

1. A DC / DC module, characterized in that, It includes a power conversion circuit, an overcurrent protection circuit, an undervoltage protection circuit, an AND gate circuit, and an anti-backflow circuit; The first input terminal of the overcurrent protection circuit is connected to the first end of the anti-backflow circuit, and the output terminal of the overcurrent protection circuit is connected to the input terminal of the power conversion circuit; The input terminal of the undervoltage protection circuit is connected to the first end of the anti-backflow circuit or the second input terminal of the overcurrent protection circuit; The first input terminal of the AND gate circuit is connected to the output terminal of the overcurrent protection circuit, the second input terminal of the AND gate circuit is connected to the output terminal of the undervoltage protection circuit, and the output terminal of the AND gate circuit is connected to the second end of the anti-backflow circuit; the output terminal of the power conversion circuit is connected to the first end of the anti-backflow circuit or the second input terminal of the overcurrent protection circuit; When the DC / DC module is in a fault state or a normal state, the undervoltage protection circuit outputs a first signal or a second signal, the overcurrent protection circuit outputs a first signal or a second signal, and the AND gate circuit outputs a first signal or a second signal to control the anti-backflow circuit to be disconnected or closed.

2. The DC / DC module according to claim 1, wherein Both the first signal and the second signal are level signals, and the level of the first signal is lower than the level of the second signal.

3. The DC / DC module according to claim 1, wherein The undervoltage protection circuit includes a first comparator. The non-inverting input terminal of the first comparator is connected to the first end of the anti-backflow circuit or the second input terminal of the overcurrent protection circuit. The voltage of the inverting input terminal of the first comparator is a first reference voltage, and the output terminal of the first comparator is connected to the second input terminal of the AND gate circuit; The first comparator is configured to output the first signal when the voltage at the first end of the anti-backflow circuit is less than the first reference voltage or the voltage at the second input terminal of the overcurrent protection circuit is less than the first reference voltage; The first comparator is further configured to output the second signal when the voltage at the first end of the anti-backflow circuit is greater than the first reference voltage or the voltage at the second input terminal of the overcurrent protection circuit is greater than the first reference voltage.

4. The DC / DC module according to any one of claims 1 to 3, characterized in that, The overcurrent protection circuit includes a second comparator, a sampling resistor, and a differential operational amplifier. The non-inverting input terminal of the differential operational amplifier is connected to the first end of the sampling resistor, the inverting input terminal of the differential operational amplifier is connected to the second end of the sampling resistor. The first end of the sampling resistor is connected to the output terminal of the power conversion circuit, the second end of the sampling resistor is connected to the first end of the anti-backflow circuit, the output terminal of the differential operational amplifier is connected to the non-inverting input terminal of the second comparator, and the voltage of the inverting input terminal of the second comparator is a second reference voltage; the output terminal of the second comparator is connected to the control terminal of the power conversion circuit and the first input terminal of the AND gate circuit.

5. The DC / DC module according to claim 4, characterized in that, The differential operational amplifier is configured to output a first voltage to the non-inverting input terminal of the second comparator according to the voltage difference between the first end and the second end of the sampling resistor; The second comparator is configured to output the second signal when the first voltage is less than the second reference voltage; The second comparator is further configured to output the first signal when the first voltage is greater than the second reference voltage.

6. The DC / DC module according to any one of claims 1 to 3, characterized in that, The anti-backflow circuit includes an anti-backflow switch and an anti-backflow diode. The positive electrode of the anti-backflow diode is connected to the first end of the anti-backflow switch and the first end of the anti-backflow circuit, and the negative electrode of the anti-backflow diode is connected to the second end of the anti-backflow switch and the power supply terminal of the low-voltage module.

7. The DC / DC module according to any one of claims 1 to 3, characterized in that The DC / DC module further includes a control module. The output terminal of the overcurrent protection circuit is connected to the first input terminal of the control module, and the output terminal of the undervoltage protection circuit is connected to the second input terminal of the control module.

8. The DC / DC module according to any one of claims 1 to 3, wherein In the first stage when the DC / DC module is powered on, the voltage at the output terminal of the power conversion circuit is less than the first voltage threshold, and the undervoltage protection circuit outputs the first signal to control the turn-off of the switch in the anti-backflow circuit; In the second stage when the DC / DC module is powered on, the voltage at the output terminal of the power conversion circuit is greater than the first voltage threshold, and the undervoltage protection circuit outputs the second signal to control the closure of the switch in the anti-backflow circuit.

9. The DC / DC module according to any one of claims 1 to 3, wherein When the output terminal of the DC / DC module is short-circuited, the overcurrent protection circuit detects that the current of the sampling resistor is greater than the first current threshold, and the overcurrent protection circuit outputs the first signal to control the turn-off of the switch in the anti-backflow circuit.

10. A vehicle, characterized in that, Comprising the DC / DC module according to any one of claims 1 to 9, a high-voltage module and a low-voltage module, the input terminal of the DC / DC module is connected to the high-voltage module, and the output terminal of the DC / DC module is connected to the low-voltage module.

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