Self-adaptive switching circuit and energy storage power supply

Abstract

The invention relates to a self-adaptive switching circuit and an energy storage power supply. The adaptive switching circuit comprises a detection module and a switching module. The detection module is used for outputting a first comparison signal when the load current exceeds a first current threshold value, and outputting a second comparison signal when the load current is lower than a second current threshold value; the first current threshold is greater than or equal to the second current threshold; the switching module is used for switching a current limiting point of the direct current conversion circuit to a first current limiting point when the duration of receiving the first comparison signal exceeds a first duration, and switching the current limiting point of the direct current conversion circuit to a second current limiting point when the duration of receiving the second comparison signal or receiving the first comparison signal does not exceed the first duration; the first current limiting point is lower than the second current limiting point. According to the invention, the adaptability of the DC conversion circuit and the load can be improved, thereby improving the electric energy utilization rate of the power supply.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to an adaptive switching circuit and an energy storage power supply. Background Technology

[0002] Energy storage power supplies often have power supply interfaces that can be connected to various loads. In related technologies, fixed current limiting points are often configured in the energy storage power supply to limit the current of the load connected to the power supply interface, thereby reducing the phenomenon of load overcurrent.

[0003] However, when different types of loads are connected to the power supply interface, these different types of loads have different current requirements for the output current of the energy storage power supply. The fixed current limiting point in the related technology cannot flexibly adapt to these different current requirements, which reduces the adaptability of the DC conversion circuit to the load, thereby reducing the power utilization rate of the power supply. Summary of the Invention

[0004] Based on this, this application provides an adaptive switching circuit and an energy storage power supply, which can improve the adaptability of DC conversion circuits to loads, thereby improving the energy utilization rate of the power supply.

[0005] In a first aspect, this application provides an adaptive switching circuit applied to a DC-DC conversion circuit, wherein the DC-DC conversion circuit is connected to a power supply and a load respectively, and includes a detection module and a switching module; the detection module is connected to both the DC-DC conversion circuit and the switching module, and the switching module is also connected to the DC-DC conversion circuit;

[0006] The detection module is used to output a first comparison signal when the load current exceeds a first current threshold and to output a second comparison signal when the load current is lower than a second current threshold; the first current threshold is greater than or equal to the second current threshold.

[0007] The switching module is used to switch the current limiting point of the DC-DC converter to the first current limiting point when the duration of receiving the first comparison signal exceeds the first duration, and to switch the current limiting point of the DC-DC converter to the second current limiting point when receiving the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration, wherein the first current limiting point is lower than the second current limiting point.

[0008] In some embodiments, the switching module includes a driving unit and a switching unit; the driving unit is connected to the detection module and the switching unit respectively; the switching unit is disposed in the first sampling channel between the two ends of the first resistor and the detection end in the DC-DC conversion circuit, and is also disposed in the second sampling channel between the two ends of the first resistor and the second resistor connected in series in the DC-DC conversion circuit and the detection end.

[0009] The driving unit is configured to output a first driving signal when the duration of receiving the first comparison signal exceeds a first duration, and to output a second driving signal when receiving the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration.

[0010] The switching unit is used to turn on the second sampling channel and turn off the first sampling channel when receiving the first driving signal, so as to switch the current limiting point of the DC-DC conversion circuit to the first current limiting point; and to turn on the first sampling channel and turn off the second sampling channel when receiving the second driving signal, so as to switch the current limiting point of the DC-DC conversion circuit to the second current limiting point.

[0011] In some embodiments, the first end of the first resistor is connected to the power supply as the first detection end, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the load.

[0012] The switching unit includes a first switch and a second switch. The first conducting terminal of the first switch is connected to the second terminal of the first resistor, the first conducting terminal of the second switch is connected to the second terminal of the second resistor, and the second conducting terminal of the second switch is connected to the second conducting terminal of the first switch, which serves as the second detection terminal. The control terminals of the first switch and the second switch are both connected to the output terminal of the driving unit.

[0013] In some embodiments, the driving unit includes a delay subunit and a driving subunit; the delay subunit is connected to the detection module and the driving subunit respectively, and the driving subunit is also connected to the switching unit.

[0014] The delay subunit is used to output a first level signal when the duration of receiving the first comparison signal exceeds a first duration, and to output a second level signal when receiving the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration;

[0015] The driving subunit is used to output a first driving signal when a first level signal is received, and to output a second driving signal when a second level signal is received.

[0016] In some embodiments, the delay subunit includes a first capacitor and a Zener diode; the first terminal of the first capacitor is connected to the output terminal of the detection module, the first terminal of the first capacitor is also connected to the cathode of the Zener diode, the second terminal of the first capacitor is grounded, and the anode of the Zener diode is connected to the input terminal of the drive subunit.

[0017] The first capacitor is used to charge in response to the first comparison signal;

[0018] A Zener diode is used to break down when the voltage of the first capacitor is greater than or equal to a set voltage, outputting a first-level signal, and to cut off when the voltage of the first capacitor is less than the set voltage, outputting a second-level signal.

[0019] In some embodiments, the driving subunit includes a first output subunit and a second output subunit; the input terminal of the first output subunit is connected to the output terminal of the delay subunit, the output terminal of the first output subunit is connected to the switching unit, the output terminal of the first output subunit is also connected to the input terminal of the second output subunit, the input terminal of the second output subunit is also connected to the second capacitor, and the output terminal of the second output subunit is connected to the switching unit.

[0020] The first output subunit is used to output the turn-on signal in the first driving signal when a first level signal is received, and to output the turn-off signal in the second driving signal when a second level signal is received;

[0021] The second output subunit is used to delay outputting the disconnect signal in the first driving signal when receiving the turn-on signal in the first driving signal, and to delay outputting the turn-on signal in the second driving signal when receiving the disconnect signal in the second driving signal.

[0022] In some embodiments, the first output subunit includes a latch subunit and a signal conversion subunit; the input terminal of the latch subunit is connected to the output terminal of the delay subunit, the output terminal of the latch subunit is connected to the input terminal of the signal conversion subunit, the output terminal of the latch subunit is also connected to a preset voltage source, the output terminal of the signal conversion subunit is connected to a switching unit, and the output terminal of the signal conversion subunit is also connected to the input terminal of the second output subunit.

[0023] The latch subunit is used to bypass the voltage signal provided by the preset voltage source when a first level signal is received, and to output the voltage signal when a second level signal is received.

[0024] The signal conversion subunit is used to output the turn-on signal in the first drive signal when no voltage signal is received, and to output the turn-off signal in the second drive signal when a voltage signal is received.

[0025] In some embodiments, the DC-DC conversion circuit includes a third resistor connected in series with the load, and the detection module includes an operational amplifier unit and a comparator unit;

[0026] The first end of the third resistor is connected to the load, and the first end of the third resistor is also connected to the non-inverting input of the operational amplifier unit. The second end of the third resistor is connected to the inverting input of the operational amplifier unit, and the output of the operational amplifier unit is connected to the input of the comparator unit.

[0027] The operational amplifier unit is used to amplify the voltage difference between the first terminal of the third resistor and the second terminal of the third resistor, and output an amplified voltage.

[0028] In some embodiments, the comparison unit includes a fourth resistor, a fifth resistor, a diode, and a comparator;

[0029] The first end of the fourth resistor is connected to the output of the operational amplifier unit, and the second end of the fourth resistor is connected to the non-inverting input of the comparator; the first end of the fifth resistor is connected to the preset voltage source, and the second end of the fifth resistor is connected to the anode of the diode, and the cathode of the diode is connected to the non-inverting input of the comparator.

[0030] The voltage at the inverting input of the comparator is the reference voltage. The output of the comparator is connected to the input of the switching module. It is used to output a first comparison signal when the received amplified voltage is greater than or equal to the reference voltage, and to output a second comparison signal when the amplified voltage is less than the reference voltage.

[0031] Secondly, this application provides an energy storage power supply, which includes a DC-DC conversion circuit and an adaptive switching circuit of any one of the first aspects connected to the DC-DC conversion circuit.

[0032] In the technical solution provided in this application embodiment, when the duration for which the load current exceeds the first current threshold exceeds the first duration, the current limiting point of the DC-DC converter is switched to a lower first current limiting point; when the duration for which the load current exceeds the first current threshold does not exceed the first duration, or when the load current is lower than the second current threshold, the current limiting point of the DC-DC converter is switched to a higher second current limiting point. This allows the current limiting point to be adaptively switched according to the magnitude of the load current, enabling the current limiting point to flexibly adapt to the current requirements of different types of loads, improving the adaptability of the DC-DC converter to the load, and thus improving the power utilization rate of the power supply. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the first embodiment;

[0035] Figure 2 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the second embodiment;

[0036] Figure 3 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the third embodiment;

[0037] Figure 4 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the fourth embodiment;

[0038] Figure 5A schematic diagram of the circuit structure of the adaptive switching circuit provided in the fifth embodiment;

[0039] Figure 6 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the sixth embodiment;

[0040] Figure 7 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the seventh embodiment;

[0041] Figure 8 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the eighth embodiment;

[0042] Figure 9 A schematic diagram of the adaptive switching circuit provided in the ninth embodiment;

[0043] Figure 10 A schematic diagram of the structure of an energy storage power supply provided for some embodiments. Detailed Implementation

[0044] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined. In the description of the embodiments of this application, "each" means each of the multiple options, unless otherwise explicitly defined.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In energy storage power supplies, the Direct Current (DC) output interface can be connected to different types of loads, such as inductive or resistive loads. Inductive loads typically require a larger starting current, meaning their starting current is greater than the operating current of a resistive load, and the starting time is usually several seconds. The operating current of an inductive load is less than that of a resistive load. The starting current and operating current of a resistive load are the same.

[0051] To improve the operational reliability of loads connected to the DC output interface, it is necessary to limit the load's operating current. While a low current limit may meet the reliability requirements of resistive loads, it cannot satisfy the starting current requirements of inductive loads, which typically require a larger starting current. Conversely, a high current limit, while meeting the starting current requirements of inductive loads, will reduce the operational reliability of resistive loads. Therefore, fixed current limiting points in related technologies cannot flexibly adapt to the current requirements of different types of loads.

[0052] For example, the DC output interface may include a cigarette lighter socket or other DC interface. For example, the cigarette lighter socket may include a 12V DC automotive universal socket. For example, the inductive load may include a fan, compressor, or pump. For example, the resistive load may include a kettle, resistance wire heater, mobile phone, or computer.

[0053] Based on this, this application provides an adaptive switching circuit that can adaptively switch the current limiting point according to the current required by the load, so that the current limiting point can flexibly adapt to the current requirements of different types of loads, improve the adaptability of DC-DC conversion circuit and load, and thus improve the power utilization rate of power supply.

[0054] Figure 1 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the first embodiment is shown below. Figure 1 As shown, the adaptive switching circuit is applied to the DC-DC conversion circuit, which is connected to both the power supply and the load. Specifically, the application of the adaptive switching circuit to the DC-DC conversion circuit may include connecting the adaptive switching circuit to the DC-DC conversion circuit.

[0055] The adaptive switching circuit includes a detection module and a switching module; the detection module is connected to both the DC-DC conversion circuit and the switching module, and the switching module is also connected to the DC-DC conversion circuit.

[0056] The detection module is used to output a first comparison signal when the load current exceeds a first current threshold, and to output a second comparison signal when the load current is lower than a second current threshold; the first current threshold is greater than or equal to the second current threshold. The switching module is used to switch the current limiting point of the DC-DC converter to the first current limiting point when the duration of receiving the first comparison signal exceeds a first duration, and to switch the current limiting point of the DC-DC converter to the second current limiting point when the second comparison signal is received or the duration of receiving the first comparison signal does not exceed the first duration; the first current limiting point is lower than the second current limiting point.

[0057] For example, a DC-DC converter circuit is a circuit connected between a power supply and a load. A first terminal of the DC-DC converter circuit is connected to the power supply, and a second terminal of the DC-DC converter circuit is connected to the load. For instance, the DC-DC converter circuit includes a positive line and a negative line; the positive terminal of the power supply is connected to the first terminal of the load via the positive line, and the negative terminal of the power supply is connected to the second terminal of the load via the negative line.

[0058] The power supply in this embodiment can be the DC output interface described above. In other embodiments, the power supply can be an AC output interface or other types of electrical output interfaces, and there is no limitation thereto. The load in this embodiment can be an inductive load, a resistive load, or other types of load, and there is no limitation thereto.

[0059] The input terminal of the detection module is connected to the DC-DC conversion circuit, the output terminal of the detection module is connected to the input terminal of the switching module, and the switching terminal of the switching module is also connected to the DC-DC conversion circuit.

[0060] In some embodiments, the detection module can detect the load current. In other embodiments, the detection module can detect the voltage across a resistor connected in series with the load, and determine whether the load current exceeds a current threshold based on whether the voltage difference across the resistor exceeds a first voltage threshold. If the voltage difference across the resistor exceeds the first voltage threshold, the load current is determined to exceed the first current threshold; if the voltage difference across the resistor is below a second voltage threshold, the load current is determined to be below the second current threshold. In still other embodiments, the detection module can detect the voltage across a resistor connected in series with the load, amplify the voltage difference across the resistor to obtain an amplified voltage difference, and determine whether the load current exceeds a current threshold based on whether the amplified voltage difference exceeds a third voltage threshold. If the amplified voltage difference exceeds the third voltage threshold, the load current is determined to exceed the first current threshold; if the amplified voltage difference is below a fourth voltage threshold, the load current is determined to be below the second current threshold.

[0061] In some embodiments, the first current threshold is greater than the second current threshold.

[0062] In other embodiments, the first current threshold is equal to the second current threshold. In this case, the load current falling between the second current threshold and the first current threshold indicates that the load current is at the first current threshold.

[0063] In some embodiments, when the load current is within the range between a second current threshold and a first current threshold, the comparison signal output by the detection module is the same as the previously output comparison signal. For example, when the load current changes from exceeding the first current threshold to falling within the range between the second and first current thresholds, the detection module still outputs the first comparison signal until the load current falls below the second current threshold, at which point it outputs the second comparison signal. Similarly, when the load current changes from below the second current threshold to falling within the range between the second and first current thresholds, the detection module still outputs the second comparison signal until the load current exceeds the first current threshold, at which point it outputs the first comparison signal. As another example, as the load changes, the load current increases or decreases; when the load current increases and exceeds the first current threshold, the first comparison signal is output; when the load current decreases and falls below the second current threshold, the second comparison signal is output.

[0064] The first voltage threshold is greater than or equal to the second voltage threshold. For example, the first voltage threshold is greater than the second voltage threshold. The third voltage threshold is greater than or equal to the fourth voltage threshold. For example, the third voltage threshold is greater than the fourth voltage threshold.

[0065] For example, the first comparison signal can be a high-level signal and the second comparison signal can be a low-level signal. In other embodiments, the first comparison signal can be a low-level signal and the second comparison signal can be a high-level signal; this application does not limit the embodiments in this way.

[0066] In this embodiment, the current limiting point is a critical current point that limits the current. The current limiting point of the DC-DC converter circuit represents the maximum current value that the DC-DC converter circuit is allowed to pass through. If the current in the DC-DC converter circuit exceeds the current limiting point, current limiting is required to restrict the current in the DC-DC converter circuit.

[0067] When the load connected to the DC-DC converter circuit is an inductive load, the starting current of the inductive load is greater than the operating current of the resistive load. In order to enable the inductive load to start normally, it is necessary to meet the high current limiting point of the inductive load.

[0068] When the load connected to the DC-DC converter circuit is a resistive load, the starting current and operating current of the resistive load are both less than the starting current of the inductive load. Therefore, it is necessary to meet the low current limit point of the resistive load.

[0069] The working principle of the embodiments of this application is explained below:

[0070] When an inductive load is connected to the DC-DC converter circuit, the inductive load starts up. Since the inductive load's starting current is high and the starting time does not exceed a first duration, the duration for which the load current exceeds the first current threshold does not exceed the first duration. Therefore, the detection module outputs a first comparison signal that does not exceed the first duration. When the inductive load is operating normally, its load current is lower than a second current threshold, and the detection module outputs a second comparison signal. Thus, when the switching module receives the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration, it switches the current limiting point of the DC-DC converter circuit to the second current limiting point. The second current limiting point is higher than the first current limiting point, thereby satisfying the high current limiting point of the inductive load.

[0071] When a resistive load is connected to a DC-DC converter circuit, if the current of the resistive load exceeds the first current threshold, the detection module outputs a first comparison signal. When the duration of receiving the first comparison signal exceeds the first duration, the switching module switches the current limiting point of the DC-DC converter circuit to the first current limiting point. The first current limiting point is lower than the second current limiting point, thereby satisfying the low current limiting point of the resistive load.

[0072] In the technical solution provided in this application embodiment, when the duration for which the load current exceeds the first current threshold exceeds the first duration, the current limiting point of the DC-DC converter is switched to a lower first current limiting point; when the duration for which the load current exceeds the first current threshold does not exceed the first duration, or when the load current is lower than the second current threshold, the current limiting point of the DC-DC converter is switched to a higher second current limiting point. This allows the current limiting point to be adaptively switched according to the magnitude of the load current, enabling the current limiting point to flexibly adapt to the current requirements of different types of loads, improving the adaptability of the DC-DC converter to the load, and thus improving the power utilization rate of the power supply.

[0073] Figure 2 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the second embodiment is shown below. Figure 2 As shown, Figure 2 Compared to Figure 1 The difference in the embodiments is that the switching module includes a driving unit and a switching unit; the driving unit is connected to the detection module and the switching unit respectively; the switching unit is set in the first sampling channel between the two ends of the first resistor R1 and the detection end in the DC-DC conversion circuit, and is also set in the second sampling channel between the two ends of the first resistor R1 and the second resistor R2 connected in series in the DC-DC conversion circuit and the detection end.

[0074] The driving unit is configured to output a first driving signal when the duration of receiving the first comparison signal exceeds a first duration, and to output a second driving signal when receiving the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration.

[0075] The switching unit is used to turn on the second sampling channel and turn off the first sampling channel when receiving the first driving signal, so as to switch the current limiting point of the DC-DC conversion circuit to the first current limiting point; and to turn on the first sampling channel and turn off the second sampling channel when receiving the second driving signal, so as to switch the current limiting point of the DC-DC conversion circuit to the second current limiting point.

[0076] The input terminal of the drive unit is connected to the output terminal of the detection module, the output terminal of the drive unit is connected to the control terminal of the switch unit, and the conduction terminal of the switch unit is connected to the DC-DC conversion circuit.

[0077] For example, both the first resistor R1 and the second resistor R2 are located in the positive terminal line. For example, the first terminal of the first resistor R1 is connected to a power supply, the second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, and the second terminal of the second resistor R2 is connected to a load. In other embodiments, both the first resistor R1 and the second resistor R2 are located in the negative terminal line. In other embodiments, the first terminal of the first resistor R1 is connected to a load, the second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, and the second terminal of the second resistor R2 is connected to a power supply.

[0078] The DC-DC converter circuit includes a first detection terminal and a second detection terminal. The first detection terminal is the first end of a first resistor R1. The second detection terminal is connected to the second end of the first resistor R1 via a switching unit, so that the switching unit is located in the first sampling channel between the two ends of the first resistor R1 and the detection terminal in the DC-DC converter circuit. The second detection terminal is also connected to the second end of a second resistor R2 via a switching unit, so that the switching unit is located in the second sampling channel between the two ends of the first resistor R1 and the second resistor R2 connected in series in the DC-DC converter circuit and the detection terminal.

[0079] The detection terminal in the DC-DC converter circuit can be used to connect to the controller. The controller can then detect the voltage difference across the first resistor R1 or the voltage difference across the series connection of the first resistor R1 and the second resistor R2. When the voltage difference is greater than or equal to the current limiting voltage threshold, the load is current limited.

[0080] In some embodiments, the switching unit may include a single-pole double-throw switch, the control terminal of the single-pole double-throw switch is connected to the output terminal of the driving unit, the stationary terminal (e.g., common terminal) of the single-pole double-throw switch is the second detection terminal, the first moving terminal (e.g., normally open terminal) of the single-pole double-throw switch is connected to the second terminal of the first resistor R1, the second moving terminal (e.g., normally closed terminal) of the single-pole double-throw switch is connected to the second terminal of the second resistor R2, and the first terminal of the first resistor R1 is the first detection terminal.

[0081] In this embodiment, considering that the controller cannot identify whether the load connected to the DC-DC conversion circuit is an inductive or resistive load, and can only limit the current based on whether the detected voltage difference reaches the current limiting voltage threshold, while matching the requirement of a high current limiting point for inductive loads and a low current limiting point for resistive loads, the following solution is proposed:

[0082] If the DC-DC converter circuit is connected to an inductive load, the drive unit outputs a second drive signal when it receives the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration. When the switch unit receives the second drive signal, it turns on the first sampling channel and turns off the second sampling channel. Since the first sampling channel is the sampling channel between the two ends of the first resistor R1 in the DC-DC converter circuit and the detection end, and the resistance value of the first resistor R1 is smaller than the resistance value of the series structure of the first resistor R1 and the second resistor R2, under the condition of a fixed current limiting voltage threshold, the requirement of a high current limiting point for the inductive load can be matched by the fixed current limiting voltage threshold and the resistance value of the first resistor R1, that is, the current limiting point of the DC-DC converter circuit is switched to the second current limiting point.

[0083] If the DC-DC converter circuit is connected to a resistive load, the drive unit outputs a first drive signal when the duration of receiving the first comparison signal exceeds a first duration. When the switch unit receives the first drive signal, it turns on the second sampling channel and turns off the first sampling channel. Since the second sampling channel is the sampling channel between the two ends of the first resistor R1 and the second resistor R2 connected in series in the DC-DC converter circuit and the detection terminal, the resistance value of the series structure of the first resistor R1 and the second resistor R2 is larger than the resistance value of the first resistor R1. Therefore, under the condition of a fixed current limiting voltage threshold, the requirement of the resistive load to have a low current limiting point can be matched by the fixed current limiting voltage threshold and the resistance value of the series structure of the first resistor R1 and the second resistor R2. That is, the current limiting point of the DC-DC converter circuit is switched to the first current limiting point.

[0084] In this embodiment, the first driving signal is a low-level signal and the second driving signal is a high-level signal. In other embodiments, the first driving signal is a high-level signal and the second driving signal is a low-level signal.

[0085] In the technical solution provided in this application embodiment, when the duration of the load current exceeding the first current threshold exceeds the first duration, the second sampling channel is turned on and the first sampling channel is turned off to switch the current limiting point of the DC-DC converter circuit to the first current limiting point; when the duration of the load current exceeding the first current threshold does not exceed the first duration, or when the load current is lower than the second current threshold, the first sampling channel is turned on and the second sampling channel is turned off to switch the current limiting point of the DC-DC converter circuit to the second current limiting point. The first sampling channel is the sampling channel between the two ends of the first resistor R1 in the DC-DC converter circuit and the detection end, and the second sampling channel is the sampling channel between the two ends of the first resistor R1 and the second resistor R2 connected in series in the DC-DC converter circuit and the detection end. By switching channels to change the design of the current limiting point, the adaptive switching of the current limiting point is realized, so that the current limiting point can flexibly adapt to the current requirements of different types of loads, improve the adaptability of the DC-DC converter circuit and the load, and thus improve the power utilization rate of the power supply.

[0086] In some embodiments, such as Figure 2 As shown, the first end of the first resistor R1 is connected to the power supply as the first detection end, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the load.

[0087] The switching unit includes a first switch RLY1 and a second switch RLY2. The first conducting terminal of the first switch RLY1 is connected to the second terminal of the first resistor R1. The first conducting terminal of the second switch RLY2 is connected to the second terminal of the second resistor R2. The second conducting terminal of the second switch RLY2 is connected to the second conducting terminal of the first switch RLY1, which serves as the second detection terminal. The control terminals of the first switch RLY1 and the second switch RLY2 are both connected to the output terminal of the drive unit.

[0088] For example, the first switch RLY1 may include a first relay, and the second switch RLY2 may include a second relay. In some embodiments, the first switch RLY1 and the second switch RLY2 are also connected to a preset voltage source, which is used to provide voltage VCC.

[0089] In some embodiments, the preset voltage source and the power supply are the same voltage source. In other embodiments, the preset voltage source and the power supply are different voltage sources.

[0090] In some embodiments, the first switch RLY1 and the second switch RLY2 can receive the same level signal output from the output terminal of the driving unit, and according to the same level signal, the first switch RLY1 and the second switch RLY2 exhibit different on / off states. In other embodiments, the first switch RLY1 and the second switch RLY2 can respectively receive different level signals output from the output terminal of the driving unit, and according to the different level signals, the first switch RLY1 and the second switch RLY2 exhibit different on / off states.

[0091] In the technical solution provided in this application embodiment, the switching unit includes a first switch RLY1 and a second switch RLY2, so that the first switch RLY1 controls the on / off state of the first sampling channel, and the second switch RLY2 controls the on / off state of the second sampling channel, thereby improving the reliability of controlling the on / off state of the sampling channel.

[0092] Figure 3 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the third embodiment is shown below. Figure 3 As shown, Figure 3 Compared to Figure 2 The difference in the embodiments is that the driving unit includes a delay subunit and a driving subunit; the delay subunit is connected to the detection module and the driving subunit respectively, and the driving subunit is also connected to the switching unit; the delay subunit is used to output a first level signal when the duration of receiving the first comparison signal exceeds a first duration, and to output a second level signal when receiving the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration; the driving subunit is used to output a first driving signal when receiving the first level signal, and to output a second driving signal when receiving the second level signal.

[0093] In this embodiment, the first level signal is a high level signal, and the second level signal is a low level signal. In other embodiments, the first level signal is a low level signal, and the second level signal is a high level signal.

[0094] In the technical solution provided in this application embodiment, when the duration of receiving the first comparison signal exceeds the first duration, the delay subunit outputs a first level signal, and when it receives the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration, it outputs a second level signal. When the driving subunit receives the first level signal, it outputs a first driving signal, and when it receives the second level signal, it outputs a second driving signal, thereby enabling the driving subunit to accurately output the first driving signal or the second driving signal.

[0095] Figure 4 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the fourth embodiment is shown below. Figure 4 As shown, Figure 4 Compared to Figure 3 The difference in the embodiments is that the delay subunit includes a first capacitor C1 and a Zener diode ZD1; the first end of the first capacitor C1 is connected to the output terminal of the detection module, and the first end of the first capacitor C1 is also connected to the cathode of the Zener diode ZD1; the second end of the first capacitor C1 is grounded, and the anode of the Zener diode ZD1 is connected to the input terminal of the drive subunit; the first capacitor C1 is used to charge in response to a first comparison signal; the Zener diode ZD1 is used to break down when the voltage of the first capacitor C1 is greater than or equal to a set voltage, outputting a first level signal, and to cut off when the voltage of the first capacitor C1 is less than the set voltage, outputting a second level signal.

[0096] Taking a scenario where the first comparison signal is high and the second comparison signal is low as an example: When the load current exceeds a first current threshold, the detection module outputs a first comparison signal, which is high. The first capacitor C1 charges in response to the first comparison signal. If the duration of receiving the first comparison signal exceeds a first duration, the voltage of the first capacitor C1 is greater than or equal to a set voltage, causing the Zener diode ZD1 to break down and output a first-level signal. If the duration of receiving the first comparison signal does not exceed the first duration, the voltage of the first capacitor C1 is less than the set voltage, causing the Zener diode ZD1 to turn off and output a second-level signal. When the load current is below the second current threshold, the detection module outputs a second comparison signal, which is low. Therefore, it no longer charges the first capacitor C1, and the voltage of the first capacitor C1 remains less than the preset voltage, causing the Zener diode ZD1 to turn off and output a second-level signal.

[0097] In some embodiments, the delay subunit may further include a sixth resistor R6, with the first end of the sixth resistor R6 connected to the first end of the first capacitor C1 and the second end of the sixth resistor R6 connected to a preset voltage source. In this way, the first comparison signal (high level) output by the detection module charges the first capacitor C1, and the preset voltage source charges the first capacitor C1 through the sixth resistor R6, thereby improving the charging efficiency of the first capacitor C1.

[0098] In this embodiment, a preset voltage source is used to provide voltage VCC.

[0099] In some embodiments, the delay unit may consist only of a first capacitor C1, with its first end connected to the output of the detection module and also connected to the output of the drive subunit, and its second end grounded. The output of the drive subunit is connected to the control terminal of the switching unit.

[0100] When the first capacitor C1 receives the first comparison signal, it charges. When the duration of receiving the first comparison signal exceeds the first duration, the first capacitor C1 will be fully charged. Or, when the voltage of the first capacitor C1 is greater than or equal to a preset voltage threshold, the first capacitor C1 will output a first level signal.

[0101] When the first capacitor C1 receives the second comparison signal (low-level signal), it discharges, and its voltage returns to its initial low potential (e.g., 0V). If the duration of receiving the first comparison signal does not exceed a first duration, the first capacitor C1 will not be fully charged or its voltage will be less than a preset voltage threshold. After that, the first capacitor C1 receives the second comparison signal, causing its voltage to become 0.

[0102] In the technical solution provided in this application embodiment, the charging characteristics of the first capacitor C1 are used to convert time dimension information into voltage dimension information, and the unidirectional breakdown characteristics of the Zener diode ZD1 are used to achieve a sudden change in level output. Without the need for complex logic control circuits, the function of determining whether the duration of the received first comparison signal exceeds the first duration is realized with a simple hardware connection. Without the need for logic control circuits or writing software algorithms, the determination of the duration of the first comparison signal can be completed by only the hardware connection of the first capacitor C1 and the Zener diode ZD1, thereby simplifying the structure of the adaptive switching circuit.

[0103] Figure 5 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the fifth embodiment is shown below. Figure 5 As shown, Figure 5 Compared to Figure 3The difference in the embodiments is that the driving subunit includes a first output subunit and a second output subunit; the input terminal of the first output subunit is connected to the output terminal of the delay subunit, the output terminal of the first output subunit is connected to the switching unit, the output terminal of the first output subunit is also connected to the input terminal of the second output subunit, the input terminal of the second output subunit is also connected to the second capacitor, and the output terminal of the second output subunit is connected to the switching unit.

[0104] The first output subunit is configured to output the turn-on signal in the first driving signal when a first level signal is received, and to output the turn-off signal in the second driving signal when a second level signal is received.

[0105] The second output subunit is used to delay outputting the disconnect signal in the first driving signal when receiving the turn-on signal in the first driving signal, and to delay outputting the turn-on signal in the second driving signal when receiving the disconnect signal in the second driving signal.

[0106] In this embodiment, the output terminal of the first output subunit is connected to the control terminal of the second switch RLY2, and the output terminal of the second output subunit is connected to the control terminal of the first switch RLY1. In other embodiments, the output terminal of the first output subunit is connected to the control terminal of the first switch RLY1, and the output terminal of the second output subunit is connected to the control terminal of the second switch RLY2.

[0107] The following explanation Figure 5 The working principle of the adaptive switching circuit in the embodiment:

[0108] When the load current exceeds a first current threshold, the detection module outputs a first comparison signal, which can be a high-level signal. The delay subunit outputs a first-level signal when the duration of the first comparison signal exceeds a first duration. Upon receiving the first-level signal, the first output subunit outputs the on signal from the first drive signal. Upon receiving the on signal from the first drive signal, the second output subunit outputs the off signal from the first drive signal after a delay. Thus, the switching unit turns on the second sampling channel based on the on signal from the first drive signal and turns off the first sampling channel based on the off signal from the first drive signal. Because the off signal in the first drive signal is output with a delay compared to the on signal, the current-limiting point of the DC-DC converter circuit is smoothly switched to the first current-limiting point, improving the adaptive switching circuit's adaptability to load changes and its operational reliability.

[0109] When the load current is lower than the second current threshold, the detection module outputs a second comparison signal, which can be a low-level signal. The delay subunit outputs a second-level signal when it receives the second comparison signal or when the time it takes to receive the first comparison signal does not exceed a first duration. The first output subunit outputs a disconnect signal from the second drive signal upon receiving the second-level signal. The second output subunit delays the output of the turn-on signal from the second drive signal upon receiving the disconnect signal. Thus, the switching unit disconnects the second sampling channel based on the disconnect signal and turns on the first sampling channel based on the turn-on signal. Because the turn-on signal in the second drive signal is output with a delay compared to the disconnect signal, the current-limiting point of the DC-DC converter circuit is smoothly switched to the second current-limiting point, improving the adaptive switching circuit's adaptability to load changes and its operational reliability.

[0110] In the technical solution provided in this application embodiment, regardless of whether the current limiting point is adjusted upward or downward, the sampling channel undergoes a smooth transition of first turning on and then turning off or first turning off and then turning on, eliminating the interruption of current sampling at the moment of switching, making the current limiting point change continuously, thereby improving the adaptability of the adaptive switching circuit to load changes and the operational reliability.

[0111] In some embodiments, such as Figure 5 As shown, the first output subunit includes a latch subunit and a signal conversion subunit; the input terminal of the latch subunit is connected to the output terminal of the delay subunit, the output terminal of the latch subunit is connected to the input terminal of the signal conversion subunit, the output terminal of the latch subunit is also connected to a preset voltage source, the output terminal of the signal conversion subunit is connected to a switching unit, and the output terminal of the signal conversion subunit is also connected to the input terminal of the second output subunit.

[0112] The latch subunit is used to bypass the voltage signal provided by the preset voltage source when a first level signal is received, and to output the voltage signal when a second level signal is received.

[0113] The signal conversion subunit is used to output the turn-on signal in the first drive signal when no voltage signal is received, and to output the turn-off signal in the second drive signal when a voltage signal is received.

[0114] In the technical solution provided in this application embodiment, when the latch subunit receives the first level signal, it bypasses the voltage signal provided by the preset voltage source, and when it receives the second level signal, it outputs the voltage signal. The latch subunit can enhance the anti-interference capability of the drive control circuit.

[0115] Please continue reading. Figure 5 The circuit structure of the latch subunit is described below:

[0116] The latch subunit includes a first transistor Q1, a second transistor Q2, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. For example, the first transistor Q1 may be an NPN transistor, and the second transistor Q2 may be a PNP transistor.

[0117] The base of the first transistor Q1 is connected to the output terminal of the delay sub-unit, the collector of the first transistor Q1 is connected to the output terminal of the signal conversion sub-unit, and the emitter of the first transistor Q1 is grounded.

[0118] The base of the first transistor Q1 is also connected to the first terminal of the seventh resistor R7, and the second terminal of the seventh resistor R7 is grounded. The base of the first transistor Q1 is also connected to the collector of the second transistor Q2, and the base of the second transistor Q2 is connected to the collector of the first transistor Q1. The emitter of the second transistor Q2 is connected to the first terminal of the eighth resistor R8, and the second terminal of the eighth resistor R8 is connected to a preset voltage source. The base of the second transistor Q2 is also connected to the first terminal of the ninth resistor R9, and the second terminal of the ninth resistor R9 is connected to a preset voltage source.

[0119] Please continue reading. Figure 5 The circuit structure of the signal conversion subunit is described below:

[0120] The signal conversion subunit includes a third transistor Q3, a fourth transistor Q4, a tenth resistor R10, and an eleventh resistor R11. The base of the third transistor Q3 is connected to the first terminal of the tenth resistor R10, and the second terminal of the tenth resistor R10 is connected to the output terminal of the latch subunit. For example, the second terminal of the tenth resistor R10 is connected to the collector of the first transistor Q1. Exemplarily, both the third transistor Q3 and the fourth transistor Q4 may be NPN transistors.

[0121] The collector of the third transistor Q3 is connected to the base of the fourth transistor Q4. The collector of the third transistor Q3 is also connected to the first terminal of the eleventh resistor R11. The second terminal of the eleventh resistor R11 is connected to a preset voltage source. The emitter of the third transistor Q3 is grounded. The collector of the fourth transistor Q4 is connected to the preset voltage source, and the emitter of the fourth transistor Q4 is grounded. For example, in the first switch RLY1 and the second switch RLY2, when either switch is not conducting, the voltage at both control terminals is VCC. When either switch is conducting, the voltage at one control terminal is VCC, while the voltage at the other control terminal is bypassed, making the voltage at the other control terminal 0.

[0122] The second end of the tenth resistor R10 is also connected to the first input end of the second output sub-unit, the collector of the fourth transistor Q4 is also connected to the second input end of the second output sub-unit, and the collector of the fourth transistor Q4 is also connected to the control end of the switching unit.

[0123] For example, when the voltage level signal output from the second terminal of the tenth resistor R10 is a high-level signal, the voltage level signal output from the collector of the fourth transistor Q4 is also a high-level signal. For example, when the voltage level signal output from the second terminal of the tenth resistor R10 is a low-level signal, the voltage level signal output from the collector of the fourth transistor Q4 is also a low-level signal.

[0124] Please continue reading. Figure 5 The circuit structure of the second output subunit is described below:

[0125] The second output sub-unit includes a first diode D1, a second diode D2, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a second capacitor C2, and a fifth transistor Q5. For example, the fifth transistor may be an NPN transistor.

[0126] For example, the anode of the first diode D1 is connected to the collector of the fourth transistor Q4, the cathode of the first diode D1 is connected to the first terminal of the twelfth resistor R12, and the cathode of the first diode D1 is also connected to the first terminal of the second capacitor C2; the second terminal of the twelfth resistor R12 is connected to the base of the fifth transistor Q5, and the second terminal of the twelfth resistor R12 is also connected to the first terminal of the thirteenth resistor R13, and the second terminal of the thirteenth resistor R13 is grounded; the collector of the fifth transistor Q5 is connected to the control terminal of the switching unit, and the emitter of the fifth transistor Q5 is grounded.

[0127] The anode of the second diode D2 is connected to the second terminal of the tenth resistor R10, and the cathode of the second diode D2 is connected to the first terminal of the fourteenth resistor R14. The second terminal of the fourteenth resistor R14 is connected to the base of the fifth transistor Q5.

[0128] Figure 6 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the sixth embodiment is shown below. Figure 6 As shown, Figure 6 Compared to Figure 5 The difference in the embodiments lies in the circuit structure of the first output subunit and the second output subunit. Figure 5 The implementation examples differ.

[0129] exist Figure 6 In the embodiment shown, the first output subunit includes a sixth transistor Q6. The base of the sixth transistor Q6 is connected to the output terminal of the delay subunit, the collector of the sixth transistor Q6 is connected to the control terminal of the switching unit, the collector of the sixth transistor Q6 is also connected to a preset voltage source, the collector of the sixth transistor Q6 is also connected to the input terminal of the second output subunit, and the emitter of the sixth transistor Q6 is grounded.

[0130] exist Figure 6In the embodiment shown, the second output sub-unit includes a third diode D3, a fifteenth resistor R15, a third capacitor C3, and a seventh transistor Q7.

[0131] The anode of the third diode D3 is connected to the collector of the sixth transistor Q6, and the cathode of the third diode D3 is connected to the first terminal of the fifteenth resistor R15. The cathode of the third diode D3 is also connected to the first terminal of the third capacitor C3, and the cathode of the third diode D3 is also connected to the base of the seventh transistor Q7. The second terminal of the fifteenth resistor R15 is grounded, the second terminal of the third capacitor C3 is grounded, the collector of the seventh transistor Q7 is connected to the control terminal of the switching unit, and the emitter of the seventh transistor Q7 is grounded.

[0132] Figure 7 A schematic diagram of the circuit structure of the adaptive switching circuit provided in the seventh embodiment is shown below. Figure 7 As shown, Figure 7 Compared to the example Figure 2 The difference in the embodiments is that the DC-DC conversion circuit includes a third resistor R3 connected in series with the load, and the detection module includes an operational amplifier unit and a comparator unit. In some embodiments, the DC-DC conversion circuit includes a third resistor R3 connected in series with the load, and the detection module includes an operational amplifier unit and a comparator unit. Figure 1 This implementation is based on the previous examples, and will not be described in detail in the embodiments of this application.

[0133] The first end of the third resistor R3 is connected to the load, and the first end of the third resistor R3 is also connected to the non-inverting input of the operational amplifier unit. The second end of the third resistor R3 is connected to the inverting input of the operational amplifier unit, and the output of the operational amplifier unit is connected to the input of the comparator unit.

[0134] The operational amplifier unit is used to amplify the voltage difference between the first terminal of the third resistor R3 and the second terminal of the third resistor R3, and output an amplified voltage.

[0135] In the technical solution provided in this application embodiment, the third resistor R3 is set in the load circuit. The first end of the third resistor R3 is connected to the load and the non-inverting input terminal of the operational amplifier unit, and the second end of the third resistor R3 is connected to the inverting input terminal of the operational amplifier unit. Thus, the voltage drop generated by the current flowing through the third resistor R3 is directly introduced into the differential input terminal of the operational amplifier unit. The operational amplifier unit amplifies the voltage drop and outputs an amplified voltage to the comparator unit. This utilizes the high input impedance characteristic of the operational amplifier unit to avoid the shunting effect on the sampling circuit and ensure sampling accuracy. At the same time, the differential input method effectively suppresses the common-mode interference that may exist across the third resistor R3, so that the amplified voltage only reflects the differential-mode signal that is proportional to the load current. Therefore, even if the load current changes by a small amount, a voltage signal with a sufficient amplitude can be obtained after amplification by the operational amplifier unit for accurate judgment by the comparator unit, thereby improving the sensitivity and anti-interference capability of current detection.

[0136] Please continue reading. Figure 7 The circuit structure of the operational amplifier unit is explained.

[0137] The operational amplifier unit includes operational amplifier U1A, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, and a nineteenth resistor R19. The first terminal of the third resistor R3 is connected to the non-inverting input of operational amplifier U1A through the sixteenth resistor R16. The second terminal of the third resistor R3 is connected to the inverting input of operational amplifier U1A through the seventeenth resistor R17. The non-inverting input of operational amplifier U1A is also grounded through the eighteenth resistor R18, and the inverting input of operational amplifier U1A is connected to the output of operational amplifier U1A through the nineteenth resistor R19. The output of operational amplifier U1A is also connected to the input of the comparator unit.

[0138] Please continue reading. Figure 7 The comparison unit includes a fourth resistor R4, a fifth resistor R5, a fourth diode D4, and a comparator U1B. The first end of the fourth resistor R4 is connected to the output of the operational amplifier unit, and the second end of the fourth resistor R4 is connected to the non-inverting input of the comparator U1B. The first end of the fifth resistor R5 is connected to a preset voltage source, and the second end of the fifth resistor R5 is connected to the anode of the fourth diode D4. The cathode of the fourth diode D4 is connected to the non-inverting input of the comparator U1B.

[0139] The voltage at the inverting input of comparator U1B is the reference voltage Vref. The output of comparator U1B is connected to the input of the switching module. It is used to output a first comparison signal when the received amplified voltage is greater than or equal to the reference voltage Vref, and to output a second comparison signal when the amplified voltage is less than the reference voltage Vref.

[0140] In the technical solution provided in this application embodiment, the fourth resistor R4 is connected between the output terminal of the operational amplifier unit and the non-inverting input terminal of the comparator U1B, and the fifth resistor R5 is connected in series with the fourth diode D4 and then connected between the preset voltage source and the non-inverting input terminal of the comparator U1B. When the amplified voltage increases and turns on the fourth diode D4, the preset voltage source participates in the distribution of the voltage at the non-inverting input terminal through the fifth resistor R5, thereby raising the comparison threshold. When the amplified voltage decreases and turns off the fourth diode D4, the voltage at the non-inverting input terminal is determined only by the amplified voltage through the fourth resistor R4, and the comparison threshold returns to a lower level. This structure forms a positive feedback path, causing a difference between the rising action threshold and the falling recovery threshold of the comparator unit, namely the hysteresis value Idiff. This hysteresis value Idiff is jointly determined by the resistance values ​​of the fifth resistor R5 and the fourth resistor R4. Therefore, when the load current gradually decreases from a state exceeding the first current threshold, the comparator unit will not immediately flip at the first current threshold, but will wait until the load current decreases to the difference between the current threshold and the hysteresis value Idiff before outputting the second comparison signal. This hysteresis characteristic effectively avoids frequent jumps in the comparison output caused by small fluctuations in the load current near the threshold, eliminates the jitter of the control signal, enables subsequent switching modules to obtain stable judgment results, and improves the reliability of the system in noisy environments.

[0141] Figure 8 This is a schematic diagram of the circuit structure of the adaptive switching circuit provided in the eighth embodiment. Figure 8 The embodiments are based on the above. Figure 2-5 and Figure 7 For the specific connections and combinations of the embodiments, please refer to the preceding description; the embodiments of this application will not elaborate further.

[0142] Figure 9 This is a schematic diagram of the circuit structure of the adaptive switching circuit provided in the ninth embodiment. Figure 9 The embodiments are based on the above. Figure 2-4 , Figure 6 and Figure 7 For the specific connections and combinations of the embodiments, please refer to the preceding description; the embodiments of this application will not elaborate further.

[0143] Figure 10 Schematic diagrams of the energy storage power supply provided for some embodiments, such as Figure 10 As shown, the energy storage power supply includes a DC-DC conversion circuit and an adaptive switching circuit of any embodiment of this application connected to the DC-DC conversion circuit.

[0144] For example, the energy storage power source can be a DC power supply device such as an energy storage power source or a vehicle power supply.

[0145] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0146] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An adaptive switching circuit, applied to a DC-DC conversion circuit, wherein the DC-DC conversion circuit is connected to a power supply and a load respectively, characterized in that, It includes a detection module and a switching module; the detection module is connected to both the DC-DC conversion circuit and the switching module, and the switching module is also connected to the DC-DC conversion circuit. The detection module is configured to output a first comparison signal when the load current exceeds a first current threshold, and to output a second comparison signal when the load current is lower than a second current threshold; wherein the first current threshold is greater than or equal to the second current threshold. The switching module is configured to switch the current limiting point of the DC-DC converter to a first current limiting point when the duration of receiving the first comparison signal exceeds a first duration, and to switch the current limiting point of the DC-DC converter to a second current limiting point when the second comparison signal is received or the duration of receiving the first comparison signal does not exceed the first duration, wherein the first current limiting point is lower than the second current limiting point.

2. The adaptive switching circuit according to claim 1, characterized in that, The switching module includes a driving unit and a switching unit; the driving unit is connected to the detection module and the switching unit respectively; the switching unit is disposed in the first sampling channel between the two ends of the first resistor and the detection end in the DC-DC conversion circuit, and is also disposed in the second sampling channel between the two ends of the first resistor and the second resistor connected in series in the DC-DC conversion circuit and the detection end. The driving unit is configured to output a first driving signal when the duration of receiving the first comparison signal exceeds a first duration, and to output a second driving signal when receiving the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration. The switching unit is configured to, upon receiving the first driving signal, turn on the second sampling channel and turn off the first sampling channel to switch the current limiting point of the DC-DC converter circuit to the first current limiting point; and upon receiving the second driving signal, turn on the first sampling channel and turn off the second sampling channel to switch the current limiting point of the DC-DC converter circuit to the second current limiting point.

3. The adaptive switching circuit according to claim 2, characterized in that, The first end of the first resistor is connected to the power supply as a first detection end, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the load. The switching unit includes a first switch and a second switch. The first conducting terminal of the first switch is connected to the second terminal of the first resistor, and the first conducting terminal of the second switch is connected to the second terminal of the second resistor. The second conducting terminal of the second switch is connected to the second conducting terminal of the first switch, which serves as the second detection terminal. The control terminals of the first switch and the second switch are both connected to the output terminal of the driving unit.

4. The adaptive switching circuit according to claim 2, characterized in that, The driving unit includes a delay subunit and a driving subunit; the delay subunit is connected to the detection module and the driving subunit respectively, and the driving subunit is also connected to the switching unit; The delay subunit is configured to output a first level signal when the duration of receiving the first comparison signal exceeds a first duration, and to output a second level signal when receiving the second comparison signal or when the duration of receiving the first comparison signal does not exceed the first duration. The driving subunit is configured to output the first driving signal when receiving the first level signal, and to output the second driving signal when receiving the second level signal.

5. The adaptive switching circuit according to claim 4, characterized in that, The delay subunit includes a first capacitor and a Zener diode; the first end of the first capacitor is connected to the output end of the detection module, the first end of the first capacitor is also connected to the cathode of the Zener diode, the second end of the first capacitor is grounded, and the anode of the Zener diode is connected to the input end of the drive subunit. The first capacitor is used to charge in response to the first comparison signal; The Zener diode is used to break down when the voltage of the first capacitor is greater than or equal to a set voltage, outputting the first level signal, and to cut off when the voltage of the first capacitor is less than the set voltage, outputting the second level signal.

6. The adaptive switching circuit according to claim 4, characterized in that, The driving subunit includes a first output subunit and a second output subunit; the input terminal of the first output subunit is connected to the output terminal of the delay subunit, the output terminal of the first output subunit is connected to the switching unit, the output terminal of the first output subunit is also connected to the input terminal of the second output subunit, the input terminal of the second output subunit is also connected to a second capacitor, and the output terminal of the second output subunit is connected to the switching unit. The first output subunit is configured to output the turn-on signal in the first driving signal when receiving the first level signal, and to output the turn-off signal in the second driving signal when receiving the second level signal; The second output subunit is configured to delay outputting the disconnect signal in the first driving signal when receiving the turn-on signal in the first driving signal, and delay outputting the turn-on signal in the second driving signal when receiving the disconnect signal in the second driving signal.

7. The adaptive switching circuit according to claim 6, characterized in that, The first output subunit includes a latch subunit and a signal conversion subunit; the input terminal of the latch subunit is connected to the output terminal of the delay subunit, the output terminal of the latch subunit is connected to the input terminal of the signal conversion subunit, the output terminal of the latch subunit is also connected to a preset voltage source, the output terminal of the signal conversion subunit is connected to the switching unit, and the output terminal of the signal conversion subunit is also connected to the input terminal of the second output subunit. The latch subunit is used to bypass the voltage signal provided by the preset voltage source when the first level signal is received, and to output the voltage signal when the second level signal is received. The signal conversion subunit is configured to output the on signal in the first drive signal when the voltage signal is not received, and to output the off signal in the second drive signal when the voltage signal is received.

8. The adaptive switching circuit according to any one of claims 1-7, characterized in that, The DC-DC conversion circuit includes a third resistor connected in series with the load, and the detection module includes an operational amplifier unit and a comparator unit. The first end of the third resistor is connected to the load, and the first end of the third resistor is also connected to the non-inverting input of the operational amplifier unit. The second end of the third resistor is connected to the inverting input of the operational amplifier unit, and the output of the operational amplifier unit is connected to the input of the comparator unit. The operational amplifier unit is used to amplify the voltage difference between the first terminal of the third resistor and the second terminal of the third resistor, and output an amplified voltage.

9. The adaptive switching circuit according to claim 8, characterized in that, The comparison unit includes a fourth resistor, a fifth resistor, a diode, and a comparator; The first end of the fourth resistor is connected to the output terminal of the operational amplifier unit, and the second end of the fourth resistor is connected to the non-inverting input terminal of the comparator; the first end of the fifth resistor is connected to a preset voltage source, the second end of the fifth resistor is connected to the anode of the diode, and the cathode of the diode is connected to the non-inverting input terminal of the comparator. The voltage at the inverting input of the comparator is a reference voltage. The output of the comparator is connected to the input of the switching module. When the received amplified voltage is greater than or equal to the reference voltage, the comparator outputs the first comparison signal. When the amplified voltage is less than the reference voltage, the comparator outputs the second comparison signal.

10. An energy storage power source, characterized in that, The energy storage power supply includes a DC-DC conversion circuit and an adaptive switching circuit according to any one of claims 1 to 9 connected to the DC-DC conversion circuit.

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