An adaptive power supply system

Abstract

This invention discloses an adaptive power supply system, which uses n DC-DC conversion modules and n-1 voltage selection modules, where n≥2. Each voltage selection module controls whether it is turned on based on the voltage input to its input terminal. The DC-DC converter is automatically matched with the input voltage signal by several voltage selection modules, and outputs voltage signals with different parameters through different output terminals to realize a wide DC input range for the power supply system. Furthermore, the efficiency of the DC-DC conversion modules is optimized through a feedback module, which improves the conversion efficiency of the power input and reduces the overall power consumption.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and more specifically to an adaptive power supply system. Background Technology

[0002] Currently, most DC-DC converters have limited input ranges, such as low-voltage DC-DC converters with a voltage range of 4.7V to 16V and high-voltage DC-DC converters with a voltage range of 10V to 58V. Wide-range input DC-DC converters are rare on the market.

[0003] Currently, most users use different narrow-range DC-DC converters to convert different input voltages to obtain the required voltage values ​​for use by different modules in the system. This solution requires the purchase of matching power supplies for conversion, which increases costs. Furthermore, it requires manual configuration of the appropriate DC-DC converter based on the input voltage value, making the solution difficult to implement. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes an adaptive power supply system that can adapt the DC-DC converter to the input voltage signal, outputting voltage signals with different parameters through different output terminals, thereby achieving a wide DC input range for the power supply system and improving the power input conversion efficiency.

[0005] This invention provides an adaptive power supply system, which includes n DC-DC conversion modules and n-1 voltage selection modules. Each voltage selection module controls whether it is turned on based on the voltage input to its input terminal.

[0006] The input terminal of the system is used to connect to the power supply of the system, the input terminal of the first DC-DC converter module is connected to the input terminal of the system, and the output terminal of the first DC-DC converter module serves as the first output terminal of the system.

[0007] The input terminal of the (i-1)th DC-DC converter module is also connected to the input terminal of the (i-1)th voltage selection module, the output terminal of the (i-1)th voltage selection module is connected to the input terminal of the ith DC-DC converter module, and the output terminal of the ith DC-DC converter module serves as the ith output terminal of the system.

[0008] Where n≥2, i=2,…,n.

[0009] As an improvement to the above solution, the system further includes n feedback modules;

[0010] The input terminal of the j-th feedback module is connected to the output terminal of the j-th DC-DC converter module, the output terminal of the j-th feedback module is connected to the feedback terminal of the j-th DC-DC converter module, and the control terminal of the j-th feedback module is used to input the j-th control signal.

[0011] The j-th feedback module feeds back the voltage value output by the j-th DC-DC converter module to the j-th DC-DC converter module based on the j-th control signal;

[0012] Where j = 1, ..., n.

[0013] Preferably, any voltage selection module in the system includes two switching units;

[0014] The voltage selection module controls the conduction or cutoff of two switching units through the input signal at its input terminal, so that the voltage selection module is turned off or on.

[0015] Furthermore, the first voltage selection module in the system includes a first resistor, a second resistor, a first Zener diode, a third resistor, a fourth resistor, a first switching unit, and a second switching unit;

[0016] The input terminal of the first voltage selection module is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the negative terminal of the first Zener diode through the second resistor, and the positive terminal of the first Zener diode is grounded.

[0017] The input terminal of the first voltage selection module is also connected to the first terminal of the third resistor, and the second terminal of the third resistor is grounded through the fourth resistor;

[0018] The input terminal of the first voltage selection module is also connected to the input terminal of the first switching unit, the output terminal of the first switching unit is connected to the second terminal of the third resistor, and the control terminal of the first switching unit is connected to the second terminal of the first resistor.

[0019] The input terminal of the first voltage selection module is also connected to the input terminal of the second switching unit, the output terminal of the second switching unit is connected to the output terminal of the first voltage selection module, and the control terminal of the second switching unit is connected to the second terminal of the third resistor.

[0020] Furthermore, the first switching unit includes a P-MOS transistor, and the second switching unit includes a P-MOS transistor.

[0021] As a parallel configuration, the second voltage selection module in the system includes a fifth resistor, a sixth resistor, a second Zener diode, a seventh resistor, an eighth resistor, a fourth switching unit, and a fifth switching unit.

[0022] The input terminal of the second voltage selection module is connected to the negative terminal of the second Zener diode, the positive terminal of the second Zener diode is connected to the first terminal of the fifth resistor, and the second terminal of the fifth resistor is grounded through the sixth resistor;

[0023] The input terminal of the second voltage selection module is also connected to the first terminal of the seventh resistor, and the second terminal of the seventh resistor is grounded through the eighth resistor;

[0024] The second end of the seventh resistor is also connected to the input end of the fourth switch unit, the output end of the fourth switch unit is grounded, and the control end of the fourth switch unit is connected to the second end of the fifth resistor.

[0025] The input terminal of the second voltage selection module is also connected to the input terminal of the fifth switching unit, the output terminal of the fifth switching unit is connected to the output terminal of the second voltage selection module, and the control terminal of the fifth switching unit is connected to the second terminal of the seventh resistor.

[0026] Furthermore, the fourth switching unit includes an N-MOS transistor, and the fifth switching unit includes an N-MOS transistor.

[0027] Preferably, any feedback module of the system includes at least a first voltage divider resistor and a second voltage divider resistor;

[0028] The input terminal of the feedback module is connected to the first terminal of the first voltage divider resistor, and the second terminal of the first voltage divider resistor is grounded through the second voltage divider resistor;

[0029] The second end of the first voltage divider resistor is connected to the output end of the feedback module;

[0030] The control signal input to the control terminal of the feedback module is used to control the current passing through the second voltage divider resistor, thereby changing the voltage value output by the feedback module.

[0031] Furthermore, the first feedback module of the system includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a third switching unit;

[0032] The input terminal of the first feedback module is connected to the first terminal of the ninth resistor, and the second terminal of the ninth resistor is connected to the output terminal of the feedback module; the second terminal of the ninth resistor is also connected to the first terminal of the tenth resistor, and the second terminal of the tenth resistor is grounded through the eleventh resistor;

[0033] The second end of the tenth resistor is connected to the input end of the third switching unit, the output end of the third switching unit is grounded, and the control end of the first feedback module is connected to the control end of the third switching unit through the twelfth resistor.

[0034] As a parallel solution, the second feedback module of the system includes a thirteenth resistor, a fourteenth resistor, and a digital-to-analog converter;

[0035] The input terminal of the second feedback module is connected to the first terminal of the thirteenth resistor, the second terminal of the thirteenth resistor is connected to the output terminal of the feedback module, and the second terminal of the thirteenth resistor is also grounded through the fourteenth resistor;

[0036] The control terminal of the second feedback module is connected to the second terminal of the thirteenth resistor through the digital-to-analog converter.

[0037] Preferably, the system further includes n diodes, the output terminal of the kth DC-DC converter module is connected to the positive terminal of the kth diode, and the negative terminal of the kth diode is connected to the kth output terminal of the system;

[0038] Where k = 1, 2, ..., n.

[0039] This invention provides an adaptive power supply system, which uses n DC-DC conversion modules and n-1 voltage selection modules, where n≥2. Each voltage selection module controls whether it is turned on based on the voltage input to its input terminal. The DC-DC converter is automatically matched with the input voltage signal by several voltage selection modules, and outputs voltage signals with different parameters through different output terminals to realize a wide DC input range for the power supply system. Furthermore, the efficiency of the DC-DC conversion modules is optimized through a feedback module, thereby improving conversion efficiency and reducing the overall power consumption. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of an adaptive power supply system provided in an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of an adaptive power supply system provided in another embodiment of the present invention;

[0042] Figure 3 This is a circuit diagram of an adaptive power supply system provided in another embodiment of the present invention. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] This invention provides an adaptive power supply system, which includes n DC-DC conversion modules and n-1 voltage selection modules. Each voltage selection module controls whether it is turned on based on the voltage input to its input terminal.

[0045] The input terminal of the system is used to connect to the power supply of the system, the input terminal of the first DC-DC converter module is connected to the input terminal of the system, and the output terminal of the first DC-DC converter module serves as the first output terminal of the system.

[0046] The input terminal of the (i-1)th DC-DC converter module is also connected to the input terminal of the (i-1)th voltage selection module, the output terminal of the (i-1)th voltage selection module is connected to the input terminal of the ith DC-DC converter module, and the output terminal of the ith DC-DC converter module serves as the ith output terminal of the system.

[0047] Where n≥2, i=2,…,n.

[0048] In the specific implementation of this embodiment, please refer to Figure 1 This is a schematic diagram of an adaptive power supply system provided in an embodiment of the present invention. The system includes: three DC-DC conversion modules, namely a first DC-DC conversion module, a second DC-DC conversion module, and a third DC-DC conversion module; and two voltage selection modules, namely a first voltage selection module and a second voltage selection module; each voltage selection module controls whether it is turned on according to the voltage input to its input terminal.

[0049] The system's input terminal IN is used to connect to the system's power supply. The input terminal of the first DC-DC converter module is connected to the system's input terminal, and the output terminal of the first DC-DC converter module serves as the system's first output terminal OUT1.

[0050] The input terminal of the first DC-DC converter module is also connected to the input terminal of the first voltage selection module, and the output terminal of the first voltage selection module is connected to the input terminal of the second DC-DC converter module. The output terminal of the second DC-DC converter module serves as the second output terminal OUT2 of the system.

[0051] The input terminal of the second DC-DC converter module is also connected to the input terminal of the second voltage selection module, and the output terminal of the second voltage selection module is connected to the input terminal of the third DC-DC converter module. The output terminal of the third DC-DC converter module serves as the third output terminal OUT3 of the system.

[0052] Each DC-DC conversion module includes a DC-DC converter for converting the input voltage into an effective output fixed voltage. Different DC-DC conversion modules are adapted to different input voltages and can convert different input voltages into voltage signals of corresponding strengths.

[0053] It should be noted that in this embodiment, n is 3, that is, the number of DC-DC conversion modules is three and the number of voltage selection modules is two to describe the connection relationship of the system; in other embodiments, n is an integer not less than 2, and the circuit connection relationship can be deduced by analogy through this embodiment, and will not be elaborated here.

[0054] The voltage level of the input signal controls the conduction or cutoff of the voltage selection module, which determines the DC-DC conversion module used for input signal conversion. The input signal is converted into a DC-DC converter and outputs a voltage signal of corresponding strength. This enables adaptive operation of wide-input voltage signals, optimizes DC-DC efficiency under different input voltage conditions, reduces losses, and improves the conversion efficiency of power input.

[0055] The adaptive power supply system provided in this embodiment achieves adaptive power supply through a simple circuit structure, has a wide range of applicable scenarios, and has high application prospects.

[0056] In another embodiment provided by the present invention, the system further includes n feedback modules;

[0057] The input terminal of the j-th feedback module is connected to the output terminal of the j-th DC-DC converter module, the output terminal of the j-th feedback module is connected to the feedback terminal of the j-th DC-DC converter module, and the control terminal of the j-th feedback module is used to input the j-th control signal.

[0058] The j-th feedback module feeds back the voltage value output by the j-th DC-DC converter module to the j-th DC-DC converter module based on the j-th control signal;

[0059] Where j = 1, ..., n.

[0060] In the specific implementation of this embodiment, please refer to Figure 2 This is a schematic diagram of an adaptive power supply system according to another embodiment of the present invention. The system includes: three DC-DC conversion modules, namely a first DC-DC conversion module, a second DC-DC conversion module and a third DC-DC conversion module; and two voltage selection modules, namely a first voltage selection module and a second voltage selection module; each voltage selection module controls whether it is turned on according to the voltage input to its input terminal.

[0061] The system also includes three feedback modules: a first feedback module, a second feedback module, and a third feedback module.

[0062] The input terminal of the first feedback module is connected to the output terminal of the first DC-DC converter module, the output terminal of the first feedback module is connected to the feedback terminal of the first DC-DC converter module, and the control terminal of the first feedback module is used to input the first control signal.

[0063] The input terminal of the second feedback module is connected to the output terminal of the second DC-DC converter module, the output terminal of the second feedback module is connected to the feedback terminal of the second DC-DC converter module, and the control terminal of the second feedback module is used to input the second control signal.

[0064] The input terminal of the third feedback module is connected to the output terminal of the third DC-DC converter module, the output terminal of the third feedback module is connected to the feedback terminal of the third DC-DC converter module, and the control terminal of the third feedback module is used to input the third control signal.

[0065] When the voltage at the input terminal of the system jumps, the voltage value at the input terminal of the DC-DC converter module changes, causing the DC-DC converter module to not always be at its optimal efficiency operating point. The feedback voltage value can be adjusted by the control signal to ensure that the DC-DC converter module always operates at its optimal efficiency point, thereby improving the efficiency of DC-DC conversion in the adaptive power supply system.

[0066] In yet another embodiment of the present invention, any voltage selection module in the system includes two switching units;

[0067] The voltage selection module controls the conduction or cutoff of two switching units through the input signal at its input terminal, so that the voltage selection module is turned off or on.

[0068] In the specific implementation of this embodiment, each voltage selection module in the system includes two switching units, namely a first switching unit and a second switching unit;

[0069] The input terminal of the voltage selection module controls the first switching unit to be turned on or off, and controls the second switching unit connected to the first switching unit to be turned on or off through the on or off of the first switching unit, thereby controlling the on or off of the voltage selection module.

[0070] The voltage selection module uses switching devices in its switching unit to perform short-circuiting or link switching, thereby achieving adaptive voltage selection circuitry and efficiency optimization.

[0071] In another embodiment provided by the present invention, the first voltage selection module in the system includes a first resistor, a second resistor, a first Zener diode, a third resistor, a fourth resistor, a first switching unit, and a second switching unit.

[0072] The input terminal of the first voltage selection module is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the negative terminal of the first Zener diode through the second resistor, and the positive terminal of the first Zener diode is grounded.

[0073] The input terminal of the first voltage selection module is also connected to the first terminal of the third resistor, and the second terminal of the third resistor is grounded through the fourth resistor;

[0074] The input terminal of the first voltage selection module is also connected to the input terminal of the first switching unit, the output terminal of the first switching unit is connected to the second terminal of the third resistor, and the control terminal of the first switching unit is connected to the second terminal of the first resistor.

[0075] The input terminal of the first voltage selection module is also connected to the input terminal of the second switching unit, the output terminal of the second switching unit is connected to the output terminal of the first voltage selection module, and the control terminal of the second switching unit is connected to the second terminal of the third resistor.

[0076] In the specific implementation of this embodiment, please refer to Figure 3 This is a circuit diagram of an adaptive power supply system provided in another embodiment of the present invention. The first voltage selection module includes a first resistor R1, a second resistor R2, a first Zener diode ZD1, a third resistor R3, a fourth resistor R4, a first switching unit Q1, and a second switching unit Q2.

[0077] The input terminal of the first voltage selection module is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the negative terminal of the first Zener diode ZD1 through the second resistor R2. The positive terminal of the first Zener diode ZD1 is grounded.

[0078] The input terminal of the first voltage selection module is also connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is grounded through the fourth resistor R4.

[0079] The input terminal of the first voltage selection module is also connected to the input terminal of the first switching unit Q1, the output terminal of the first switching unit Q1 is connected to the second terminal of the third resistor R3, and the control terminal of the first switching unit is connected to the second terminal of the first resistor R1.

[0080] The input terminal of the first voltage selection module is also connected to the input terminal of the second switching unit Q2, the output terminal of the second switching unit Q2 is connected to the output terminal of the first voltage selection module, and the control terminal of the second switching unit is connected to the second terminal of the third resistor R3.

[0081] The voltage applied to the Zener diode at the input terminal causes the Zener diode to break down or not, thereby controlling the voltage value at the control terminal of the first switching unit, controlling the conduction or cutoff of the first switching unit, and thus controlling the voltage value at the control terminal of the second switching unit, controlling the conduction or cutoff of the second switching unit.

[0082] An adaptive voltage selection module is implemented using a simple circuit consisting of resistors, Zener diodes, and switching units. It selects the DC-DC converter module based on the strength of the input voltage.

[0083] In another embodiment of the present invention, the first switching unit includes a P-MOS transistor, and the second switching unit includes a P-MOS transistor.

[0084] In this specific implementation, in the first voltage selection module, the first switching unit Q1 and the second switching unit Q2 commonly use P-channel MOSFETs;

[0085] The maximum gate-source breakdown voltage V of a P-channel MOSFET gsmax It must be greater than the voltage drop across the gate-source resistor at the system's input, and the maximum withstand voltage V between the drain and source. dsmax It needs to be greater than the voltage at the system's input terminal;

[0086] The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are voltage divider resistors. The first resistor R1 and the second resistor R2 are connected in series. The voltage across the first resistor R1 must be greater than the turn-on voltage V of the first switching unit Q1. gs1 The third resistor R3 and the fourth resistor R4 are connected in series, and the voltage drop across the third resistor R3 must be greater than the turn-on voltage V of the second switching unit Q2. gs2 ;

[0087] The first Zener diode, ZD1, is a Zener diode, and its voltage regulation value is set according to the required jump-off voltage threshold.

[0088] The working process of this invention can be divided into two cases: high-level input and low-level input, depending on the magnitude of the input voltage at the system input terminal.

[0089] When the system input is high, the high level input exceeds the breakdown threshold of the first Zener diode ZD1, causing ZD1 to break down. This results in the gate-source voltage of the first switching unit Q1 exceeding V. gs1 When the first switching unit Q1 is turned on, the third resistor R3 is short-circuited, and the voltage between the gate and source of the second switching unit Q2 is less than V. gs2When the second switch unit Q2 is turned off, the high-level input at the system input terminal is directly connected to the first DC-DC converter module. After the first DC-DC converter module outputs the changed voltage value, it is output to the first output terminal OUT1. Figure 3 The direction of current flow in S1.

[0090] When the system input is low, the low level is less than the breakdown threshold of the first Zener diode ZD1, the first Zener diode ZD1 is not broken down, and the voltage between the gate and source of the first switching unit Q1 is less than V. gs1 The first switching unit Q1 is off, the third resistor R3 is not short-circuited, and the voltage between the gate and source of the second switching unit Q2 is greater than V. gs2 When the second switch unit Q2 is turned on, the high-level input at the system input terminal is connected to the second DC-DC converter module through the second switch unit Q2. After the second DC-DC converter module outputs the changed voltage value, it is output to the second output terminal OUT2, i.e. Figure 3 The direction of current flow in S2.

[0091] The first output terminal OUT1 is also connected to the input terminal of the second DC-DC converter module, achieving a hierarchical connection. However, during actual operation, when the system input terminal is low, the first output terminal OUT1 is short-circuited by the second switching unit Q2 due to excessive losses. Therefore, the circuit flows from the second switching unit Q2 to the second DC-DC converter module. Figure 3 The S2 flow direction in the module is as follows; similarly, the second output terminal OUT2 is also connected to the input terminal of the third DC-DC converter module.

[0092] It should be noted that the second voltage selection module can also control the connection of the second or third DC-DC converter module to the circuit by turning it on or off. When the input voltage is lower than the selection threshold of the second voltage selection module, corresponding to the breakdown threshold of the Zener diode, the input signal is connected to the third DC-DC converter module through the second voltage selection module. The third DC-DC converter module outputs the changed voltage value and then outputs it to the third output terminal OUT3. When the input voltage is higher than the selection threshold, the input signal is connected to the second DC-DC converter module. The second DC-DC converter module outputs the changed voltage value and then outputs it to the second output terminal OUT2.

[0093] It should be noted that in this embodiment, the circuit working principle is explained using three DC-DC conversion modules. In other embodiments, by managing the breakdown threshold of the Zener diodes in different voltage selection modules, different input voltages can be matched to different DC-DC conversion modules. The specific principle is similar to that of this embodiment and will not be elaborated here.

[0094] It should be noted that the first voltage selection module disclosed in this embodiment is a specific implementation of the voltage selection module in the system. Any voltage selection module in the system can adopt the structure of the first voltage selection module. In the specific implementation of this invention, the voltage selection module can adopt the structure of the first voltage selection module, or the voltage selection module can adopt other structures with the same function.

[0095] In another embodiment provided by the present invention, the second voltage selection module in the system includes a fifth resistor, a sixth resistor, a second Zener diode, a seventh resistor, an eighth resistor, a fourth switching unit, and a fifth switching unit;

[0096] The input terminal of the second voltage selection module is connected to the negative terminal of the second Zener diode, the positive terminal of the second Zener diode is connected to the first terminal of the fifth resistor, and the second terminal of the fifth resistor is grounded through the sixth resistor;

[0097] The input terminal of the second voltage selection module is also connected to the first terminal of the seventh resistor, and the second terminal of the seventh resistor is grounded through the eighth resistor;

[0098] The second end of the seventh resistor is also connected to the input end of the fourth switch unit, the output end of the fourth switch unit is grounded, and the control end of the fourth switch unit is connected to the second end of the fifth resistor.

[0099] The input terminal of the second voltage selection module is also connected to the input terminal of the fifth switching unit, the output terminal of the fifth switching unit is connected to the output terminal of the second voltage selection module, and the control terminal of the fifth switching unit is connected to the second terminal of the seventh resistor.

[0100] In the specific implementation of this embodiment, please refer to Figure 3 The second voltage selection module includes a fifth resistor R5, a sixth resistor R6, a second Zener diode ZD2, a seventh resistor R7, an eighth resistor R8, a fourth switching unit Q4, and a fifth switching unit Q5.

[0101] The input terminal of the second voltage selection module is connected to the negative terminal of the second Zener diode ZD2, the positive terminal of the second Zener diode ZD2 is connected to the first terminal of the fifth resistor R5, and the second terminal of the fifth resistor R5 is grounded through the sixth resistor R6.

[0102] The input terminal of the second voltage selection module is also connected to the first terminal of the seventh resistor R7, and the second terminal of the seventh resistor R7 is grounded through the eighth resistor R8.

[0103] The second end of the seventh resistor R7 is also connected to the input end of the fourth switch unit Q4, the output end of the fourth switch unit Q4 is grounded, and the control end of the first switch unit is connected to the second end of the fifth resistor R5.

[0104] The input terminal of the second voltage selection module is also connected to the input terminal of the fifth switching unit Q5, the output terminal of the fifth switching unit Q5 is connected to the output terminal of the second voltage selection module, and the control terminal of the second switching unit is connected to the second terminal of the seventh resistor R7.

[0105] The voltage applied to the Zener diode at the input terminal causes the Zener diode to break down or not, thereby controlling the voltage value at the control terminal of the fourth switching unit, controlling the conduction or cutoff of the fourth switching unit, and thus controlling the voltage value at the control terminal of the fifth switching unit, controlling the conduction or cutoff of the fifth switching unit.

[0106] An adaptive voltage selection module is implemented using a simple circuit consisting of resistors, Zener diodes, and switching units. It selects the DC-DC converter module based on the strength of the input voltage.

[0107] In another embodiment of the present invention, the fourth switching unit includes an N-MOS transistor, and the fifth switching unit includes an N-MOS transistor.

[0108] In this specific implementation, in the second voltage selection module, the fourth switching unit Q4 and the fifth switching unit Q5 commonly use N-channel MOSFETs;

[0109] The maximum gate-drain withstand voltage V of an N-channel MOSFET gdmax It must be greater than the voltage drop across the gate-drain resistor at the system's input, and the maximum withstand voltage V between the source and drain. sdmax It needs to be greater than the voltage at the system's input terminal;

[0110] The fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are voltage divider resistors. The fifth resistor R5 and the sixth resistor R6 are connected in series. The voltage across the fifth resistor R5 must be greater than the turn-on voltage V of the fourth switch unit Q4. gs4 The seventh resistor R7 and the eighth resistor R8, wherein the voltage drop across the seventh resistor R7 must be greater than the turn-on voltage V of the fifth switch unit Q5. gs5 ;

[0111] The second Zener diode, ZD2, is a Zener diode, and its voltage regulation value is set according to the required jump-off voltage threshold.

[0112] The working process of this invention can be divided into two cases: high-level input and low-level input, depending on the magnitude of the input voltage at the system input terminal.

[0113] It should be noted that in this embodiment, by managing the breakdown threshold of the Zener diodes in different voltage selection modules, different input voltages can be matched to different DC-DC conversion modules. The specific principle is similar to that in the above embodiment and will not be repeated here.

[0114] It should be noted that the second voltage selection module disclosed in this embodiment is a specific implementation of the voltage selection module in the system. Any voltage selection module in the system can adopt the structure of the second voltage selection module. In the specific implementation of this invention, the voltage selection module can adopt the structure of the second voltage selection module, or the voltage selection module can adopt other structures with the same function.

[0115] In yet another embodiment of the present invention, any feedback module of the system includes at least a first voltage divider resistor and a second voltage divider resistor;

[0116] The input terminal of the feedback module is connected to the first terminal of the first voltage divider resistor, and the second terminal of the first voltage divider resistor is grounded through the second voltage divider resistor;

[0117] The second end of the first voltage divider resistor is connected to the output end of the feedback module;

[0118] The control signal input to the control terminal of the feedback module is used to control the current passing through the second voltage divider resistor, thereby changing the voltage value output by the feedback module.

[0119] In a specific implementation of this embodiment, any feedback module in the system includes a first voltage divider resistor and a second voltage divider resistor;

[0120] The input terminal of the feedback module is connected to the first terminal of the first voltage divider resistor, and the second terminal of the first voltage divider resistor is grounded through the second voltage divider resistor;

[0121] The second end of the first voltage divider resistor is connected to the output end of the feedback module, and the output end of the feedback module is connected to the feedback end of the DC-DC converter module.

[0122] The control signal input to the control terminal of the feedback module is used to control the current passing through the second voltage divider resistor, thereby controlling the voltage value across the second voltage divider resistor, and thus controlling the voltage value output by the feedback module to the DC-DC converter module.

[0123] In another embodiment provided by the present invention, the first feedback module of the system includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a third switching unit;

[0124] The input terminal of the first feedback module is connected to the first terminal of the ninth resistor, and the second terminal of the ninth resistor is connected to the output terminal of the feedback module; the second terminal of the ninth resistor is also connected to the first terminal of the tenth resistor, and the second terminal of the tenth resistor is grounded through the eleventh resistor;

[0125] The second end of the tenth resistor is connected to the input end of the third switching unit, the output end of the third switching unit is grounded, and the control end of the first feedback module is connected to the control end of the third switching unit through the twelfth resistor.

[0126] In this specific implementation, the first feedback module of the system includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a third switching unit Q3;

[0127] The input terminal of the first feedback module is connected to the first terminal of the ninth resistor R9, the second terminal of the ninth resistor R9 is connected to the first terminal of the tenth resistor R10, and the second terminal of the tenth resistor R10 is grounded through the eleventh resistor R11.

[0128] The second end of the ninth resistor R9 is connected to the output end of the first feedback module, and the output end of the first feedback module is connected to the feedback end of the first DC-DC converter module.

[0129] The input terminal of the third switching unit Q3 is connected to the second terminal of the tenth resistor R10, the output terminal of the third switching unit Q3 is grounded, and the control terminal of the first feedback module is connected to the control terminal of the third switching unit Q3 through the twelfth resistor R12.

[0130] The first control signal CONTROL1, input to the control terminal of the first feedback module, controls the conduction of the third switching unit through a current-limiting resistor. This controls whether the twelfth resistor is short-circuited, controls the current flowing through the ninth and tenth resistors, thereby controlling the voltage across the tenth resistor. This, in turn, controls the voltage output from the feedback module to the first DC-DC converter module. By controlling the voltage fed back from the feedback module to the first DC-DC converter module through the control signal, the first DC-DC converter module is always operating at its optimal efficiency point.

[0131] In another embodiment provided by the present invention, the second feedback module of the system includes a thirteenth resistor, a fourteenth resistor, and a digital-to-analog converter;

[0132] The input terminal of the second feedback module is connected to the first terminal of the thirteenth resistor, the second terminal of the thirteenth resistor is connected to the output terminal of the feedback module, and the second terminal of the thirteenth resistor is also grounded through the fourteenth resistor;

[0133] The control terminal of the second feedback module is connected to the second terminal of the thirteenth resistor through the digital-to-analog converter.

[0134] In the specific implementation of this embodiment, please refer to Figure 3 The second feedback module includes a thirteenth resistor R13, a fourteenth resistor R14, and a digital-to-analog converter (DAC).

[0135] The input terminal of the second feedback module is connected to the first terminal of the thirteenth resistor R13, and the second terminal of the thirteenth resistor R13 is grounded through the fourteenth resistor R14.

[0136] The second end of the thirteenth resistor R13 is connected to the output end of the second feedback module, and the output end of the second feedback module is connected to the feedback end of the second DC-DC converter module.

[0137] The second control signal CONTROL2, input to the control terminal of the second feedback module, controls the current output to the fourteenth resistor. This current is then output to the fourteenth resistor via a digital-to-analog converter, controlling the current in the fourteenth resistor. This, in turn, controls the voltage value output by the feedback module to the second DC-DC converter module. By controlling the voltage fed back to the second DC-DC converter module through the control signal, the second DC-DC converter module is always operating at its optimal efficiency point.

[0138] In another embodiment of the present invention, the system further includes n diodes, the output terminal of the kth DC-DC converter module is connected to the positive terminal of the kth diode, and the negative terminal of the kth diode is connected to the kth output terminal of the system.

[0139] Where k = 1, 2, ..., n.

[0140] In the specific implementation of this embodiment, please refer to Figure 3 The system includes three diodes, namely a first diode D1, a second diode D2, and a third diode D3;

[0141] The output terminal of the first DC-DC converter module is connected to the positive terminal of the first diode D1, and the negative terminal of the first diode D1 is connected to the first output terminal OUT1 of the system.

[0142] The output terminal of the second DC-DC converter module is connected to the positive terminal of the second diode D2, and the negative terminal of the second diode D2 is connected to the second output terminal OUT2 of the system.

[0143] The output terminal of the third DC-DC converter module is connected to the positive terminal of the third diode D3, and the negative terminal of the third diode D3 is connected to the third output terminal OUT3 of the system.

[0144] By using diodes to limit the direction of the current output from the DC-DC converter module, the stability of the system operation is improved.

[0145] The adaptive power supply system provided by this invention can adapt to multiple power inputs, meet wide input power supply requirements, and is compatible with standard PoE and various non-standard PoE power supplies.

[0146] It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered to be within the scope of protection of this invention.

Claims

1. An adaptive power supply system, characterized in that, The system includes: n DC-DC conversion modules and n-1 voltage selection modules, each voltage selection module controls whether it is turned on according to the voltage input to its input terminal; The input terminal of the system is used to connect to the power supply of the system, the input terminal of the first DC-DC converter module is connected to the input terminal of the system, and the output terminal of the first DC-DC converter module serves as the first output terminal of the system. The input terminal of the (i-1)th DC-DC converter module is also connected to the input terminal of the (i-1)th voltage selection module, the output terminal of the (i-1)th voltage selection module is connected to the input terminal of the ith DC-DC converter module, and the output terminal of the ith DC-DC converter module serves as the ith output terminal of the system. Where n≥2, i=2,…,n; The (i-1)th output terminal of the system is connected to the input terminal of the i-th DC-DC converter module.

2. The adaptive power supply system according to claim 1, characterized in that, The system also includes n feedback modules; The input terminal of the j-th feedback module is connected to the output terminal of the j-th DC-DC converter module, the output terminal of the j-th feedback module is connected to the feedback terminal of the j-th DC-DC converter module, and the control terminal of the j-th feedback module is used to input the j-th control signal. The j-th feedback module feeds back the voltage value output by the j-th DC-DC converter module to the j-th DC-DC converter module based on the j-th control signal; Where j=1,…,n.

3. The adaptive power supply system according to claim 1, characterized in that, Each voltage selection module in the system includes two switching units; The voltage selection module controls the conduction or cutoff of two switching units through the input signal at its input terminal, so that the voltage selection module is turned off or on.

4. The adaptive power supply system according to claim 3, characterized in that, The first voltage selection module in the system includes a first resistor, a second resistor, a first Zener diode, a third resistor, a fourth resistor, a first switching unit, and a second switching unit; The input terminal of the first voltage selection module is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the negative terminal of the first Zener diode through the second resistor, and the positive terminal of the first Zener diode is grounded. The input terminal of the first voltage selection module is also connected to the first terminal of the third resistor, and the second terminal of the third resistor is grounded through the fourth resistor; The input terminal of the first voltage selection module is also connected to the input terminal of the first switching unit, the output terminal of the first switching unit is connected to the second terminal of the third resistor, and the control terminal of the first switching unit is connected to the second terminal of the first resistor. The input terminal of the first voltage selection module is also connected to the input terminal of the second switching unit, the output terminal of the second switching unit is connected to the output terminal of the first voltage selection module, and the control terminal of the second switching unit is connected to the second terminal of the third resistor.

5. The adaptive power supply system according to claim 4, characterized in that, The first switching unit includes a P-MOS transistor, and the second switching unit includes a P-MOS transistor.

6. The adaptive power supply system according to claim 3, characterized in that, The second voltage selection module in the system includes a fifth resistor, a sixth resistor, a second Zener diode, a seventh resistor, an eighth resistor, a fourth switching unit, and a fifth switching unit. The input terminal of the second voltage selection module is connected to the negative terminal of the second Zener diode, the positive terminal of the second Zener diode is connected to the first terminal of the fifth resistor, and the second terminal of the fifth resistor is grounded through the sixth resistor; The input terminal of the second voltage selection module is also connected to the first terminal of the seventh resistor, and the second terminal of the seventh resistor is grounded through the eighth resistor; The second end of the seventh resistor is also connected to the input end of the fourth switch unit, the output end of the fourth switch unit is grounded, and the control end of the fourth switch unit is connected to the second end of the fifth resistor. The input terminal of the second voltage selection module is also connected to the input terminal of the fifth switching unit, the output terminal of the fifth switching unit is connected to the output terminal of the second voltage selection module, and the control terminal of the fifth switching unit is connected to the second terminal of the seventh resistor.

7. The adaptive power supply system according to claim 6, characterized in that, The fourth switching unit includes an N-MOS transistor, and the fifth switching unit includes an N-MOS transistor.

8. The adaptive power supply system according to claim 2, characterized in that, Each feedback module of the system includes at least a first voltage divider resistor and a second voltage divider resistor; The input terminal of the feedback module is connected to the first terminal of the first voltage divider resistor, and the second terminal of the first voltage divider resistor is grounded through the second voltage divider resistor; The second end of the first voltage divider resistor is connected to the output end of the feedback module; The control signal input to the control terminal of the feedback module is used to control the current passing through the second voltage divider resistor, thereby changing the voltage value output by the feedback module.

9. The adaptive power supply system according to claim 8, characterized in that, The first feedback module of the system includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a third switching unit; The input terminal of the first feedback module is connected to the first terminal of the ninth resistor, and the second terminal of the ninth resistor is connected to the output terminal of the feedback module; the second terminal of the ninth resistor is also connected to the first terminal of the tenth resistor, and the second terminal of the tenth resistor is grounded through the eleventh resistor; The second end of the tenth resistor is connected to the input end of the third switching unit, the output end of the third switching unit is grounded, and the control end of the first feedback module is connected to the control end of the third switching unit through the twelfth resistor.

10. The adaptive power supply system according to claim 8, characterized in that, The second feedback module of the system includes a thirteenth resistor, a fourteenth resistor, and a digital-to-analog converter; The input terminal of the second feedback module is connected to the first terminal of the thirteenth resistor, the second terminal of the thirteenth resistor is connected to the output terminal of the feedback module, and the second terminal of the thirteenth resistor is also grounded through the fourteenth resistor; The control terminal of the second feedback module is connected to the second terminal of the thirteenth resistor through the digital-to-analog converter.

11. The adaptive power supply system according to claim 1, characterized in that, The system also includes n diodes, with the output terminal of the kth DC-DC converter module connected to the positive terminal of the kth diode, and the negative terminal of the kth diode connected to the kth output terminal of the system. Where k = 1, 2, ..., n.

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