A power management system and method

Abstract

The application discloses a power supply management system and method, which comprises a voltage detection module, a first power supply path, a second power supply path and a power supply switching module; the voltage detection module is used for detecting an input voltage provided by an input power supply and outputting a switching control signal based on a comparison result between the input voltage and a preset switching voltage; the first power supply path is used for directly supplying power to a to-be-powered circuit by the input power supply; the second power supply path comprises a voltage boosting module and is used for supplying power to the to-be-powered circuit by the input power supply after the input power supply passes through the voltage boosting module; and the power supply switching module is used for conducting the first power supply path or the second power supply path in response to the switching control signal. Based on this, the power supply path can be switched according to the input voltage, the first power supply path is used for power supply when the input voltage meets the power supply requirement of the to-be-powered circuit, and the second power supply path is used for power supply when the input voltage is lower than the power supply requirement, so that the input voltage application range of the to-be-powered circuit is expanded, the power supply efficiency is improved, and the circuit structure is simplified.

Description

Technical Field

[0001] This invention relates to the field of power supply management, and in particular to a power supply management system and method. Background Technology

[0002] Infrared thermal imaging modules typically include power supply circuits for the detector, FPGA (Field-Programmable Gate Array) and chip minimum system, and peripheral circuits. Different circuits require different supply voltages and noise levels; therefore, Buck power supplies, Boost power supplies, and LDO (Low Dropout Regulator) power supplies are usually used in combination. To ensure proper LDO operation, the current power supply circuits typically require an input voltage higher than a preset voltage. Therefore, when the external supply voltage decreases, an additional boost circuit is needed before supplying power to the circuit, leading to reduced power efficiency and increased complexity of the peripheral circuitry. Therefore, how to expand the input voltage range of the power supply circuits while improving power efficiency is a pressing technical problem to be solved in this field. Summary of the Invention

[0003] The purpose of this invention is to provide a power supply management system and method that can switch power supply paths according to the input voltage. When the input voltage meets the power supply requirements of the circuit to be powered, the first power supply path is used to supply power, and when the input voltage is lower than the power supply requirements, the second power supply path is used to supply power, thereby expanding the applicable range of input voltage for the circuit to be powered, improving power supply efficiency, and simplifying the circuit structure.

[0004] To solve the above-mentioned technical problems, the present invention provides a power supply management system, comprising: The voltage detection module is used to detect the input voltage provided by the input power supply and output a switching control signal based on the comparison result between the input voltage and the preset switching voltage. The first power supply path is used to directly supply power to the circuit to be powered by the input power; The second power supply path includes a boost module, which is used to supply power to the circuit to be powered after the input power is passed through the boost module. A power switching module is used to respond to the switching control signal and turn on the first power supply path or the second power supply path.

[0005] Preferably, the voltage detection module includes a voltage sampling circuit and a control circuit; The voltage sampling circuit is used to sample the input voltage; The control circuit is used to determine the comparison result between the input voltage and the preset switching voltage based on the sampled voltage output by the voltage sampling circuit, and to generate the switching control signal based on the comparison result.

[0006] Preferably, the voltage sampling circuit includes a first sampling resistor and a second sampling resistor; The first sampling resistor and the second sampling resistor are connected in series between the input power supply and the ground terminal, and the connection point between the first sampling resistor and the second sampling resistor is connected to the control circuit.

[0007] Preferably, the control circuit includes an analog-to-digital converter module and a controller; The analog-to-digital converter module is used to convert the sampled voltage of the analog quantity at the connection point between the first sampling resistor and the second sampling resistor into a digital signal, and output the digital signal to the controller; The controller is used to determine the comparison result between the input voltage and the preset switching voltage from the digital signal, and to generate the switching control signal based on the comparison result.

[0008] Preferably, the control circuit includes a comparator; The comparator is used to compare the sampled voltage at the connection point between the first sampling resistor and the second sampling resistor with the reference voltage, so as to generate the switching control signal based on the comparison result; The reference voltage is used in conjunction with a voltage divider circuit consisting of the first sampling resistor and the second sampling resistor, so that the comparison result between the sampled voltage and the reference voltage corresponds to the comparison result between the input voltage and the preset switching voltage.

[0009] Preferably, the system further includes a reference voltage generation circuit for generating the reference voltage for comparison by the comparator.

[0010] Preferably, the power switching module includes a dual-channel ideal diode, the first input terminal of the dual-channel ideal diode is connected to the first power supply path, the second input terminal of the dual-channel ideal diode is connected to the second power supply path, and the output terminal of the dual-channel ideal diode is connected to the circuit to be powered, for responding to the switching control signal to turn on the first power supply path or the second power supply path.

[0011] Preferably, the switching control signal is output based on the comparison result between the input voltage and the preset switching voltage, including: When the input voltage is not lower than the preset switching voltage, a switching control signal for turning on the first power supply path is output; when the input voltage is lower than the preset switching voltage, a switching control signal for turning on the second power supply path is output.

[0012] To solve the above-mentioned technical problems, the present invention provides a power supply management method, applied to the aforementioned power supply management system, the method comprising: Detect the input voltage provided by the input power supply; A switching control signal is generated based on the comparison result between the input voltage and the preset switching voltage; Based on the switching control signal, the first power supply path or the second power supply path is activated, wherein the first power supply path is used to enable the input power supply to directly supply power to the circuit to be powered, and the second power supply path is used to enable the input power supply to supply power to the circuit to be powered after passing through the boost module.

[0013] Preferably, generating a switching control signal based on a comparison between the input voltage and a preset switching voltage includes: When the input voltage is not lower than the preset switching voltage, a first switching control signal is output to turn on the first power supply path; When the input voltage is lower than the preset switching voltage, a second switching control signal is output to turn on the second power supply path.

[0014] This application provides a power supply management system and method, including a voltage detection module, a first power supply path, a second power supply path, and a power switching module. The voltage detection module detects the input voltage provided by the input power supply and outputs a switching control signal based on a comparison between the input voltage and a preset switching voltage. The first power supply path directly supplies power to the circuit to be powered. The second power supply path includes a boost module for supplying power to the circuit to be powered after the input power supply has passed through the boost module. The power switching module responds to the switching control signal and switches on either the first or second power supply path. Based on this, the power supply path can be switched according to the input voltage. When the input voltage meets the power supply requirements of the circuit to be powered, the first power supply path is used; when the input voltage is lower than the power supply requirements, the second power supply path is used. This expands the applicable range of input voltages for the circuit to be powered, improves power supply efficiency, and simplifies the circuit structure. Attached Figure Description

[0015] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a power supply management system provided in this application; Figure 2 A schematic diagram of a voltage sampling circuit and an analog-to-digital conversion module provided in this application; Figure 3 A schematic diagram of a dual-channel ideal diode and a first power supply path and a second power supply path provided in this application; Figure 4 A schematic diagram of a comparator provided in this application; Figure 5 A schematic diagram of a reference voltage generation circuit provided in this application; Figure 6 A schematic diagram of the specific structure of the first power supply management system provided in this application; Figure 7 A schematic diagram of the specific structure of the second power supply management system provided in this application; Figure 8 This is a schematic diagram of the specific structure of the third power supply management system provided in this application. Detailed Implementation

[0017] The core of this invention is to provide a power supply management system and method that can switch power supply paths according to the input voltage. When the input voltage meets the power supply requirements of the circuit to be powered, the first power supply path is used to supply power, and when the input voltage is lower than the power supply requirements, the second power supply path is used to supply power, thereby expanding the applicable range of input voltage for the circuit to be powered, improving power supply efficiency, and simplifying the circuit structure.

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0019] Please refer to Figure 1 , Figure 1 This application provides a schematic diagram of a power supply management system, which includes: Voltage detection module 1 is used to detect the input voltage DC_IN provided by the input power supply, and output a switching control signal CTR based on the comparison result between the input voltage DC_IN and the preset switching voltage; The first power supply path 2 is used to directly supply power to the circuit to be powered by the input power; The second power supply path 3 includes a boost module U2, which is used to supply power to the circuit to be powered after the input power is boosted through the boost module U2. The power switching module 4 is used to respond to the switching control signal CTR and turn on the first power supply path 2 or the second power supply path 3.

[0020] The power supply management system in this embodiment is mainly used to solve the problem that the circuit to be powered can still obtain a power supply voltage that meets the working requirements when the input power supply voltage changes. When the input voltage DC_IN of the input power supply is in a high range, the input power supply can be used directly to supply power to the circuit to be powered; when the input power supply voltage drops to a level that cannot meet the normal working requirements of the circuit to be powered, the power supply path is switched to a boosted voltage path to continue supplying power, so that the circuit to be powered can maintain normal operation within a wider range of input voltage DC_IN, while avoiding the need for constant boosting when the input voltage DC_IN meets the power supply requirements.

[0021] The power management system provided in this embodiment includes a voltage detection module 1, a first power supply path 2, a second power supply path 3, and a power switching module 4. The input power source can be an external DC power supply, such as a battery, power adapter, or other power supply device capable of outputting DC voltage; this embodiment does not limit this. The circuit to be powered can be a detector power supply circuit, a processor power supply circuit, a peripheral power supply circuit, or other circuits requiring stable power; there can also be multiple circuits to be powered, again without limitation in this embodiment.

[0022] The voltage detection module 1 is connected to the input power supply and is used to detect the input voltage DC_IN provided by the input power supply in real time. Based on the comparison between the input voltage DC_IN and the preset switching voltage, it outputs a switching control signal CTR. The preset switching voltage represents the voltage threshold corresponding to the system's power supply path switching. Its value can be set according to the minimum normal operating voltage of the circuit to be powered, the input requirements of the subsequent voltage regulator circuit, or the overall power supply requirements of the device, and is not limited to a fixed value. For example, in some infrared thermal imaging devices, the circuit to be powered needs to ensure sufficient input margin for the subsequent voltage regulator circuit; in this case, the preset switching voltage can be set to 3.6V. For other devices, it can also be set to other voltage values ​​according to actual power supply requirements. Therefore, the preset switching voltage is not a limiting condition of this application, but rather a parameter configured according to actual application requirements.

[0023] After setting up voltage detection module 1, the current voltage status of the input power supply can be obtained in real time, and the power supply path to be used can be determined according to whether the input voltage DC_IN reaches the preset switching voltage, so that the same power supply method is not always used, thus providing a basis for the selection of subsequent power supply paths.

[0024] The first power supply path 2 is used to directly supply power to the circuit to be powered. When the input voltage DC_IN provided by the input power supply is sufficient to meet the power supply requirements of the circuit to be powered, there is no need for further boosting; instead, the power is supplied directly using the first power supply path 2. Because the boost conversion stage is reduced during the power supply process, the conversion loss during the power supply process can be reduced, and the continuous operation of the boost circuit can be avoided.

[0025] The second power supply path 3 includes a boost module U2, which supplies power to the circuit to be powered after the input power is applied. The boost module U2 converts the input voltage DC_IN provided by the input power supply into a supply voltage that meets the operating requirements of the circuit to be powered. When the input voltage DC_IN drops below a preset switching voltage, it indicates that the input power supply can no longer directly meet the power requirements of the circuit to be powered. In this case, the input power supply first enters the boost module U2 for voltage conversion, and then supplies power to the circuit to be powered through the second power supply path 3, thus ensuring that the circuit to be powered can still obtain a supply voltage that meets its operating requirements. Therefore, even if the input power supply voltage drops, the circuit to be powered can still maintain normal operation, thus expanding the usable voltage range of the input power supply.

[0026] The power switching module 4 is connected to the first power supply path 2, the second power supply path 3, and the voltage detection module 1, respectively. It responds to the switching control signal CTR output by the voltage detection module 1, activating either the first power supply path 2 or the second power supply path 3. When the input voltage DC_IN is not lower than the preset switching voltage, the voltage detection module 1 outputs the corresponding switching control signal CTR, causing the power switching module 4 to activate the first power supply path 2. In this case, the input power directly supplies power to the circuit to be powered. When the input voltage DC_IN is lower than the preset switching voltage, the voltage detection module 1 outputs another switching control signal CTR, causing the power switching module 4 to activate the second power supply path 3. In this case, the input power supplies power to the circuit to be powered after passing through the boost module U2. The power switching module 4 automatically selects the corresponding power supply path based on changes in the input voltage DC_IN, without manual intervention, thus enabling the circuit to be powered to automatically switch power supply modes according to changes in the input voltage DC_IN.

[0027] A voltage regulator circuit can also be provided before the circuit to be powered in this application. The voltage regulator circuit can be a Buck regulator circuit, a Boost regulator circuit, an LDO regulator circuit, or other voltage regulator circuits. Its specific form can be selected according to the power supply requirements of different circuits to be powered, and this application does not limit it in this regard.

[0028] In summary, this embodiment, by setting up a voltage detection module 1, a first power supply path 2, a second power supply path 3, and a power switching module 4, enables the power supply path to switch based on the comparison result between the input voltage DC_IN and the preset switching voltage. When the input voltage DC_IN meets the power supply requirements of the circuit to be powered, the first power supply path 2 directly supplies power; when the input voltage DC_IN is insufficient, the second power supply path 3 supplies power via the boost module U2. This allows the circuit to be powered to be adapted to a wider range of input voltage DC_IN and reduces unnecessary boost conversions when the input voltage DC_IN meets the requirements. The entire power management system selects the power supply path only based on changes in the input voltage DC_IN, thus it is applicable to different types of circuits to be powered and facilitates the configuration of corresponding preset switching voltages according to the power supply requirements of different products.

[0029] Based on this, by switching the power supply path according to the input voltage DC_IN, the first power supply path 2 is used to supply power when the input voltage DC_IN meets the power supply requirements of the circuit to be powered, and the second power supply path 3 is used to supply power when the input voltage DC_IN is lower than the power supply requirements, thereby expanding the applicable range of the input voltage DC_IN of the circuit to be powered, improving the power supply efficiency, and simplifying the circuit structure.

[0030] Based on the above embodiments: Please refer to Figures 2 to 8 , Figure 2 This is a schematic diagram of the structure of a voltage sampling circuit and an analog-to-digital conversion module provided in this application. Figure 3 This application provides a schematic diagram of a dual-channel ideal diode and its first and second power supply paths. Figure 4 This is a schematic diagram of the structure of a comparator provided in this application. Figure 5 This is a schematic diagram of a reference voltage generation circuit provided in this application. Figure 6 This is a schematic diagram of the specific structure of the first power supply management system provided in this application. Figure 7 This is a schematic diagram of the specific structure of the second power supply management system provided in this application. Figure 8 This is a schematic diagram of the specific structure of the third power supply management system provided in this application.

[0031] In a preferred embodiment, the voltage detection module 1 includes a voltage sampling circuit 11 and a control circuit; Voltage sampling circuit 11 is used to sample the input voltage DC_IN; The control circuit is used to determine the comparison result between the input voltage DC_IN and the preset switching voltage based on the sampled voltage output by the voltage sampling circuit 11, and to generate the switching control signal CTR based on the comparison result.

[0032] In this embodiment, the voltage detection module 1 includes a voltage sampling circuit 11 and a control circuit. The voltage sampling circuit 11 samples the input voltage DC_IN provided by the input power supply. The control circuit determines the comparison result between the input voltage DC_IN and the preset switching voltage based on the sampled voltage output by the voltage sampling circuit 11, and generates a switching control signal CTR based on the comparison result for the power switching module 4 to switch the power supply path.

[0033] The input voltage DC_IN refers to the actual voltage value currently output by the input power supply. Since the input power supply can be a battery, power adapter, or other DC power source, its output voltage may change with remaining power, load variations, or the power supply environment. Therefore, it is necessary to acquire the changes in the input voltage DC_IN in real time. The voltage sampling circuit 11 is used to acquire the voltage signal corresponding to the input voltage DC_IN from the input power supply and output the sampled voltage. The sampled voltage can be the input voltage DC_IN itself, or a corresponding voltage obtained from the input voltage DC_IN, as long as it reflects the changes in the input voltage DC_IN; this application does not limit this. Therefore, the function of the voltage sampling circuit 11 is to convert the voltage state of the input power supply into a voltage signal that is easy for subsequent control circuits to process, providing a basis for subsequent determination of the power supply path.

[0034] It should be noted that there is a corresponding relationship between the sampled voltage and the input voltage DC_IN. When the input voltage DC_IN changes, the sampled voltage changes accordingly. Therefore, the control circuit does not need to directly detect the input voltage DC_IN, but can determine the current voltage range of the input voltage DC_IN based on the sampled voltage. Using the sampled voltage as the basis for judgment allows the voltage detection module 1 to directly obtain the voltage information used for judgment, and also facilitates the configuration of corresponding detection methods according to different input voltage DC_IN ranges. Therefore, it is suitable for power supply management systems with different input voltage DC_IN ranges.

[0035] The control circuit receives the sampled voltage output from the voltage sampling circuit 11, and after determining the comparison result between the input voltage DC_IN and the preset switching voltage based on the sampled voltage, generates a corresponding switching control signal CTR. When the comparison result shows that the input voltage DC_IN meets the power supply requirements of the circuit to be powered, the control circuit generates the corresponding switching control signal CTR to enable the power switching module 4 to conduct the first power supply path 2; when the comparison result shows that the input voltage DC_IN does not meet the power supply requirements of the circuit to be powered, the control circuit generates another switching control signal CTR to enable the power switching module 4 to conduct the second power supply path 3. Since the control circuit generates the switching control signal CTR only based on the comparison result between the input voltage DC_IN and the preset switching voltage, any subsequent method used to complete the comparison or generate the switching control signal CTR falls under the implementation of the control circuit described in this application.

[0036] By dividing the voltage detection module 1 into a voltage sampling circuit 11 and a control circuit, the voltage sampling circuit 11 is responsible for acquiring the sampled voltage reflecting the state of the input voltage DC_IN. On the other hand, the control circuit is responsible for determining the power supply path switching based on the sampled voltage and generating a switching control signal CTR. This makes the acquisition process of the input voltage DC_IN and the power supply path control process independent of each other. When the range of the input voltage DC_IN changes or the power supply requirements of the circuit to be powered change, only the corresponding sampling method or control method needs to be adjusted to meet different application requirements without changing the working process of the entire power supply management system. Therefore, it can be applied to different types of power supply scenarios.

[0037] In a preferred embodiment, the voltage sampling circuit 11 includes a first sampling resistor R1 and a second sampling resistor R2; The first sampling resistor R1 and the second sampling resistor R2 are connected in series between the input power supply and the ground terminal, and the connection point between the first sampling resistor R1 and the second sampling resistor R2 is connected to the control circuit.

[0038] In this embodiment, the voltage sampling circuit 11 includes a first sampling resistor R1 and a second sampling resistor R2. The first sampling resistor R1 and the second sampling resistor R2 are connected in series between the input power supply and the ground terminal. The connection point between the first sampling resistor R1 and the second sampling resistor R2 is connected to the control circuit to provide the control circuit with a sampling voltage corresponding to the input voltage DC_IN.

[0039] In this circuit, the first sampling resistor R1 and the second sampling resistor R2 together form a voltage divider circuit. When the input voltage DC_IN from the input power supply is applied across the first sampling resistor R1 and the second sampling resistor R2, a voltage divider is formed at the connection point between them due to the series connection. This voltage divider is then output as the sampling voltage to the control circuit. Since the sampling voltage is obtained by dividing the input voltage DC_IN, it changes synchronously with the input voltage DC_IN. The control circuit can reflect the current state of the input voltage DC_IN based on the sampling voltage without directly processing the higher input voltage DC_IN.

[0040] It should be noted that the resistance values ​​of the first sampling resistor R1 and the second sampling resistor R2 in this embodiment can be set according to the input voltage DC_IN range and the input voltage DC_IN range that the control circuit can receive. For example, when the highest output voltage of the input power supply is higher than the voltage range that the control circuit can directly detect, the ratio of the resistance values ​​of the first sampling resistor R1 and the second sampling resistor R2 can be adjusted to ensure that the sampling voltage output at the connection point is always within the detection range allowed by the control circuit. For products with different input voltage DC_IN ranges, different combinations of resistance values ​​can also be selected. Therefore, the specific resistance values ​​of the first sampling resistor R1 and the second sampling resistor R2 are not fixed values, but are determined according to the input voltage DC_IN range and the detection requirements of the control circuit.

[0041] Furthermore, the resistance ratio between the first sampling resistor R1 and the second sampling resistor R2 determines the correspondence between the sampling voltage and the input voltage DC_IN. When the input voltage DC_IN changes, the sampling voltage output at the connection point changes proportionally. Therefore, the control circuit can determine the current voltage range of the input voltage DC_IN based on the sampling voltage. It's easy to understand that for the same control circuit, only the resistance ratio between the first sampling resistor R1 and the second sampling resistor R2 needs to be changed to adapt to different input voltage DC_IN ranges without altering the control circuit itself. This facilitates configuration according to the power supply requirements of different products.

[0042] In this embodiment, the connection point between the first sampling resistor R1 and the second sampling resistor R2 is used as the sampling point, and this sampling point is connected to the control circuit. This allows the control circuit to obtain a sampling voltage reflecting changes in the input voltage DC_IN, and also allows the control circuit to operate within its allowable input voltage DC_IN range, preventing the input voltage DC_IN from being directly applied to the control circuit. When the input voltage DC_IN changes, the sampling voltage changes synchronously, allowing the control circuit to determine the subsequent power supply path based on the sampling voltage. This enables the power management system to select the corresponding power supply path based on changes in the input voltage DC_IN.

[0043] It should be noted that the voltage sampling circuit 11 constructed using the first sampling resistor R1 and the second sampling resistor R2 in this embodiment is only a preferred implementation. Its purpose is to obtain the sampling voltage corresponding to the input voltage DC_IN using a voltage divider method. For those skilled in the art, as long as the sampling voltage corresponding to the input voltage DC_IN can be obtained and output to the control circuit, other forms of voltage sampling methods can also be used without affecting the implementation of this application. This clarifies the specific connection method of this embodiment without limiting the voltage sampling circuit 11 to a unique implementation.

[0044] In a preferred embodiment, the control circuit includes an analog-to-digital converter module U1 and a controller; The analog-to-digital converter module U1 is used to convert the sampled voltage of the analog quantity at the connection point between the first sampling resistor R1 and the second sampling resistor R2 into a digital signal, and output the digital signal to the controller; The controller is used to determine the comparison result between the input voltage DC_IN and the preset switching voltage using a digital signal, and to generate a switching control signal CTR based on the comparison result.

[0045] In this embodiment, the analog-to-digital converter module U1 in the control circuit is connected to the connection point between the first sampling resistor R1 and the second sampling resistor R2. It is used to receive the sampling voltage at the connection point, convert the sampling voltage from analog to digital, and then output the digital signal to the controller. The controller is used to receive the digital signal, determine the comparison result between the input voltage DC_IN and the preset switching voltage based on the digital signal, and generate the switching control signal CTR based on the comparison result.

[0046] The sampling voltage output from the connection point between the first sampling resistor R1 and the second sampling resistor R2 is a continuously changing analog voltage signal. Since the controller typically processes data digitally, the sampling voltage is converted into a digital signal via the analog-to-digital converter U1 before the controller makes its judgment. The digital signal can be understood as a digital quantity corresponding to the sampling voltage, reflecting the current voltage magnitude. Because the sampling voltage corresponds to the input voltage DC_IN, the digital signal can also reflect the current voltage state of the input voltage DC_IN, allowing the controller to complete subsequent judgments without directly processing the analog quantity.

[0047] It should be noted that the analog-to-digital conversion module U1 can convert the sampled voltage according to a preset sampling period, or it can perform analog-to-digital conversion operations according to the control instructions of the controller. This embodiment does not limit this. For those skilled in the art, any implementation of the analog-to-digital conversion module U1 that can convert the sampled voltage into a digital signal that the controller can process is considered a possible implementation of the analog-to-digital conversion module U1 described in this application. For example, the analog-to-digital conversion module U1 can be a separately configured analog-to-digital conversion chip, or it can be an analog-to-digital conversion unit integrated into the processor. This application does not limit either of these options.

[0048] After receiving the digital signal, the controller determines the comparison result between the input voltage DC_IN and the preset switching voltage based on the digital signal. The preset switching voltage still represents the voltage threshold corresponding to the power supply path switching. Since the controller processes digital signals, it can pre-store the digital reference value corresponding to the preset switching voltage, or calculate the corresponding digital reference value based on the preset switching voltage, and then compare the digital signal with this digital reference value to determine whether the input voltage DC_IN has reached the preset switching voltage. Those skilled in the art can determine the digital reference value corresponding to the preset switching voltage based on parameters such as the conversion accuracy, reference voltage, and resolution of the analog-to-digital converter module U1; this application does not limit this.

[0049] When the controller determines that the input voltage DC_IN is not lower than the preset switching voltage, it generates a corresponding switching control signal CTR to control the power switching module 4 to conduct the first power supply path 2. When the controller determines that the input voltage DC_IN is lower than the preset switching voltage, it generates another switching control signal CTR to control the power switching module 4 to conduct the second power supply path 3. The entire judgment process is based on digital signals, so the controller can directly execute the judgment and control according to the program without further processing of the analog signals.

[0050] The controller can be, but is not limited to, an FPGA.

[0051] In a preferred embodiment, the control circuit includes a comparator U4; Comparator U4 is used to compare the sampled voltage at the connection point between the first sampling resistor R1 and the second sampling resistor R2 with the reference voltage VREF, so as to generate a switching control signal CTR based on the comparison result; The reference voltage VREF is used in conjunction with a voltage divider circuit consisting of a first sampling resistor R1 and a second sampling resistor R2, so that the comparison result between the sampled voltage and the reference voltage VREF corresponds to the comparison result between the input voltage DC_IN and the preset switching voltage.

[0052] In this embodiment, the control circuit is implemented using comparator U4. One input terminal of comparator U4 is connected to the junction between the first sampling resistor R1 and the second sampling resistor R2, and is used to receive the sampled voltage output by the voltage sampling circuit 11; the other input terminal receives the reference voltage VREF. Comparator U4 outputs a corresponding switching control signal CTR based on the relationship between the sampled voltage and the reference voltage VREF. The power switching module 4 selects to activate either the first power supply path 2 or the second power supply path 3 based on this switching control signal CTR. Unlike the aforementioned implementation that uses digital processing to generate the switching control signal CTR, this embodiment directly uses comparator U4 to complete the voltage judgment and directly outputs the switching control signal CTR, thus eliminating the need for digital conversion and program processing of the sampled voltage.

[0053] It should be noted that the reference voltage VREF in this embodiment is used as the reference voltage for comparator U4, and its value is not required to be consistent with the preset switching voltage. The preset switching voltage represents the input voltage DC_IN threshold corresponding to the power supply path switching, while the reference voltage VREF represents the reference voltage used by comparator U4 when performing voltage comparison. The two are voltage parameters in different positions, so they can have different values.

[0054] Since the input voltage DC_IN first passes through a voltage divider circuit consisting of the first sampling resistor R1 and the second sampling resistor R2 to form a sampling voltage, comparator U4 actually compares the sampling voltage, not the input voltage DC_IN. For any preset switching voltage, once the resistance ratio of the first sampling resistor R1 and the second sampling resistor R2 is determined, a corresponding sampling voltage can be obtained. Therefore, by setting the reference voltage VREF to the voltage value corresponding to this sampling voltage, the sampling voltage and the reference voltage VREF will achieve a corresponding comparison relationship when the input voltage DC_IN reaches the preset switching voltage. It can be seen that the preset switching voltage is not directly used as the reference voltage of comparator U4, but is converted by the voltage divider circuit and then applied to the input terminal of comparator U4. Therefore, the reference voltage VREF needs to work in conjunction with the voltage divider circuit to achieve the power supply path switching corresponding to the preset switching voltage.

[0055] For example, when the preset switching voltage is set to 3.6V, the sampling voltage corresponding to the connection point when the input voltage DC_IN is 3.6V is first calculated based on the resistance ratio of the first sampling resistor R1 and the second sampling resistor R2. Then, the reference voltage VREF of comparator U4 is set to the voltage value corresponding to this sampling voltage. When the input voltage DC_IN is higher than 3.6V, the sampling voltage is correspondingly higher than the reference voltage VREF; when the input voltage DC_IN is lower than 3.6V, the sampling voltage is correspondingly lower than the reference voltage VREF. Therefore, the comparison result output by comparator U4 corresponds to the comparison result between the input voltage DC_IN and the preset switching voltage. For other preset switching voltages, the reference voltage VREF can also be determined according to the above correspondence. Therefore, the preset switching voltage in this application is not limited to 3.6V, but can be set according to the power supply requirements of the circuit to be powered.

[0056] Furthermore, when comparator U4 outputs a signal indicating that the sampled voltage is not lower than the reference voltage VREF, it means that the input voltage DC_IN is not lower than the preset switching voltage. At this time, comparator U4 outputs a first-state switching control signal CTR, causing the power switching module 4 to conduct the first power supply path 2. When comparator U4 outputs a signal indicating that the sampled voltage is lower than the reference voltage VREF, it means that the input voltage DC_IN is lower than the preset switching voltage. At this time, comparator U4 outputs a second-state switching control signal CTR, causing the power switching module 4 to conduct the second power supply path 3. The entire switching control process is directly completed by the control signal output by comparator U4, so the power supply path switching can be completed without the controller's involvement in the judgment.

[0057] Based on this, in one embodiment, an analog-to-digital converter module U1 and a controller can be used to implement voltage detection; in another embodiment, a comparator U4 can be used to directly compare the input voltage DC_IN with the preset switching voltage. When the comparator U4 is used as the control circuit, it can directly output the switching control signal CTR to the power switching module 4 without further processing by the controller, thus reducing the control process. Both voltage detection methods can output the switching control signal CTR and can cooperate with the aforementioned power switching module 4 to achieve power supply path switching.

[0058] In another embodiment, the boost module U2 can also employ a boost integrated circuit with integrated voltage detection and power supply path switching functions. This boost integrated circuit can directly select between direct power supply or boost power supply based on the input voltage DC_IN, and complete the boost of the input voltage DC_IN. Therefore, the voltage detection module 1, the power switching module 4, and the boost module U2 can be integrated into the same boost integrated circuit, without needing to be set up as independent devices. For example, the boost integrated circuit can be implemented using a Boost chip with pass-through function.

[0059] In a preferred embodiment, a reference voltage generation circuit U5 is also included, which generates a reference voltage VREF for comparison by comparator U4.

[0060] This embodiment also includes a reference voltage generation circuit U5, which generates a reference voltage VREF for comparison by comparator U4 and outputs the reference voltage VREF to the reference input terminal of comparator U4. Comparator U4 generates a corresponding switching control signal CTR based on the comparison result between the reference voltage VREF and the sampled voltage, thereby controlling the switching of the power supply path.

[0061] It should be noted that the reference voltage generation circuit U5 is used to provide a relatively stable reference voltage. Since comparator U4 determines its operation based on the relationship between the sampled voltage and the reference voltage VREF, a significant change in the reference voltage VREF will cause a corresponding change in the actual switching voltage, thus affecting the timing of the power supply path switching. Therefore, this embodiment provides a reference voltage to comparator U4 by setting up an independent reference voltage generation circuit U5, ensuring that comparator U4 always uses the corresponding reference voltage for comparison during operation.

[0062] In this embodiment, the reference voltage generation circuit U5 can be implemented using a reference voltage source, a reference voltage chip, a reference voltage regulator circuit, or other circuits capable of outputting a reference voltage. As long as it can provide the comparator U4 with a reference voltage VREF for comparison, it falls under the implementation methods of the reference voltage generation circuit U5 described in this application, and this application does not limit it in this regard. Therefore, this embodiment does not limit the specific device model or circuit form of the reference voltage generation circuit U5, nor does it limit the specific value of its output voltage.

[0063] Furthermore, the reference voltage VREF output by the reference voltage generation circuit U5 can be configured according to actual power supply requirements. When the preset switching voltage corresponding to the circuit to be powered changes, the reference voltage VREF can be configured accordingly based on the parameters of the voltage divider circuit, so that the comparator U4 can still output the corresponding switching control signal CTR when the input voltage DC_IN reaches the preset switching voltage. Therefore, the reference voltage VREF output by the reference voltage generation circuit U5 is not fixed, but is a reference voltage determined jointly by the preset switching voltage and the voltage divider circuit.

[0064] For example, in one embodiment, the reference voltage generation circuit U5 can output a reference voltage VREF of approximately 2.5V. After the input voltage DC_IN is divided by the first sampling resistor R1 and the second sampling resistor R2, when the input voltage DC_IN reaches the preset switching voltage, the sampling voltage is approximately 2.5V. At this time, the comparator U4 completes the power supply path switching. For other preset switching voltages, the corresponding reference voltage VREF can also be configured according to the voltage division relationship, or the reference voltage VREF can be kept unchanged while adjusting the resistance ratio of the voltage divider circuit, so that the comparator U4 can still complete the switching at the corresponding input voltage DC_IN. Therefore, in this embodiment, the reference voltage VREF is only used as a reference voltage for the comparator U4 to perform voltage comparison, and its specific value can be selected according to the actual application and is not limited to the above example.

[0065] In one embodiment, the reference voltage VREF can be lower than the preset switching voltage. This is because the reference voltage generation circuit U5 is typically powered by the input power supply. When the input voltage DC_IN is allowed to be lower than the preset switching voltage, the reference voltage generation circuit U5 cannot directly output a reference voltage with the same value as the preset switching voltage. Therefore, this embodiment uses a lower reference voltage VREF and works with a voltage divider circuit to achieve switching control corresponding to the preset switching voltage, without requiring the reference voltage VREF to maintain the same value as the preset switching voltage.

[0066] In a preferred embodiment, the power switching module 4 includes a dual-channel ideal diode U3. The first input terminal of the dual-channel ideal diode U3 is connected to the first power supply path 2, the second input terminal of the dual-channel ideal diode U3 is connected to the second power supply path 3, and the output terminal of the dual-channel ideal diode U3 is connected to the circuit to be powered, so as to respond to the switching control signal CTR and turn on the first power supply path 2 or the second power supply path 3.

[0067] The dual-channel ideal diode U3 includes a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to the first power supply path 2, the second input terminal is connected to the second power supply path 3, and the output terminal is connected to the circuit to be powered. The dual-channel ideal diode U3 receives a switching control signal CTR and, according to the switching control signal CTR, opens the conduction path between the first input terminal and the output terminal, or opens the conduction path between the second input terminal and the output terminal, thereby realizing the switching between the first power supply path 2 and the second power supply path 3.

[0068] The first input terminal corresponds to the first power supply path 2, which directly supplies power from the input power source. The second input terminal corresponds to the second power supply path 3, which is the input power source after passing through the boost module U2. The output terminal serves as the power supply output terminal, supplying power to the circuit to be powered. Therefore, the dual-channel ideal diode U3 is located between the two power supply paths and the circuit to be powered, selecting between the two power supply paths so that at any given time, only one path outputs power to the circuit to be powered.

[0069] In this embodiment, the dual-channel ideal diode U3 changes its conduction state according to the switching control signal CTR. When the input voltage DC_IN corresponding to the switching control signal CTR is not lower than the preset switching voltage, the dual-channel ideal diode U3 conducts the conduction path between the first input terminal and the output terminal, allowing the input power supply to directly supply power to the circuit to be powered through the first power supply path 2. At this time, the conduction path corresponding to the second input terminal remains in the off state. When the input voltage DC_IN corresponding to the switching control signal CTR is lower than the preset switching voltage, the dual-channel ideal diode U3 conducts the conduction path between the second input terminal and the output terminal, allowing the input power supply to supply power to the circuit to be powered through the second power supply path 3 after passing through the boost module U2. At this time, the conduction path corresponding to the first input terminal remains in the off state. Thus, the two power supply paths can switch according to the change of the input voltage DC_IN without manual intervention.

[0070] It should be noted that in this embodiment, the dual-channel ideal diode U3 switches its conduction state in response to the switching control signal CTR, and its specific internal control method is not considered a limitation of this application. For those skilled in the art, any method that can select to turn on the first or second input terminal according to the switching control signal CTR and connect the corresponding power supply path to the output terminal falls under the implementation of the dual-channel ideal diode U3 described in this application. Therefore, this embodiment does not limit the specific model or internal circuit structure of the dual-channel ideal diode U3.

[0071] Furthermore, since both the first power supply path 2 and the second power supply path 3 are connected to the dual-channel ideal diode U3, the two power supply paths share the same output terminal to supply power to the circuit to be powered. When the power supply path is switched, the circuit to be powered is always powered by the output terminal, without the need to set up two sets of output interfaces separately, nor is it necessary to add an additional switching circuit on the side of the circuit to be powered, so that the power supply path switching is completed in the power switching module 4.

[0072] This embodiment uses a dual-channel ideal diode U3 as the power switching module 4. On one hand, it can select either the first power supply path 2 or the second power supply path 3 based on the switching control signal CTR. On the other hand, it allows the two power supply paths to share the same power output terminal. When the input voltage DC_IN meets the power supply requirements, the first power supply path 2 is used directly; when the input voltage DC_IN is insufficient, it switches to the second power supply path 3. The entire switching process only changes the power supply path, while the power supply interface of the circuit to be powered remains unchanged. Therefore, the circuit to be powered does not need to be adjusted according to the change in the power supply path. Furthermore, since the first power supply path 2 and the second power supply path 3 will not be turned on simultaneously, mutual interference between the two power supplies can be avoided, making the power switching process more stable.

[0073] In one embodiment, the dual-channel ideal diode U3 may include multiple control terminals, and the switching control signal CTR may include one or more control signals, with different control signals corresponding to different conduction states. When the comparator U4 directly outputs the switching control signal CTR, the switching between the first power supply path 2 and the second power supply path 3 can be completed using only one control signal, while the remaining control terminals can maintain a fixed level.

[0074] As a preferred embodiment, a switching control signal is output based on a comparison between the input voltage and a preset switching voltage, including: When the input voltage DC_IN is not lower than the preset switching voltage, a switching control signal CTR is output to turn on the first power supply path 2; when the input voltage DC_IN is lower than the preset switching voltage, a switching control signal CTR is output to turn on the second power supply path 3.

[0075] In this embodiment, the voltage detection module 1 continuously detects the input voltage DC_IN provided by the input power supply, and outputs a corresponding switching control signal CTR according to the relationship between the input voltage DC_IN and the preset switching voltage, so as to control the power supply management system to select different power supply paths.

[0076] The preset switching voltage represents the input voltage DC_IN threshold corresponding to the power supply path switching performed by the power supply management system. The preset switching voltage can be determined based on the minimum input voltage DC_IN required for the circuit to be powered to operate normally, or it can be set according to the input requirements of the subsequent voltage regulator circuit. For example, when the circuit to be powered includes a voltage regulator circuit, the preset switching voltage can be set according to the minimum input voltage DC_IN required for the voltage regulator circuit to operate normally, ensuring that the circuit to be powered always receives an input voltage DC_IN that meets its operating requirements. For different types of circuits to be powered, the preset switching voltage can be set to different values. Therefore, the preset switching voltage in this embodiment is not limited to a fixed value, but is configured according to actual power supply needs.

[0077] When the voltage detection module 1 detects that the input voltage DC_IN is not lower than the preset switching voltage, it indicates that the input power supply can directly meet the power supply requirements of the circuit to be powered. At this time, the voltage detection module 1 outputs a switching control signal CTR to turn on the first power supply path 2. The power switching module 4 responds to the switching control signal CTR, turns on the first power supply path 2, and allows the input power supply to directly supply power to the circuit to be powered without going through the boost module U2. Since the input voltage DC_IN already meets the power supply requirements of the circuit to be powered, the first power supply path 2 can be used directly to complete the power supply, thereby reducing the boost process.

[0078] When the voltage detection module 1 detects that the input voltage DC_IN is lower than the preset switching voltage, it indicates that the input power supply can no longer directly meet the power supply requirements of the circuit to be powered. At this time, the voltage detection module 1 outputs a switching control signal CTR to activate the second power supply path 3. The power switching module 4 responds to the switching control signal CTR, activating the second power supply path 3, so that the input power first enters the boost module U2 for voltage conversion, and then supplies power to the circuit to be powered through the second power supply path 3. By boosting the input voltage DC_IN through the boost module U2, the circuit to be powered can still obtain a power supply voltage that meets the operating requirements even when the input voltage DC_IN decreases.

[0079] It should be noted that in this embodiment, the power supply path switching condition is based on whether the input voltage DC_IN reaches the preset switching voltage. Therefore, the voltage detection module 1 only needs to output the corresponding switching control signal CTR based on the comparison result between the input voltage DC_IN and the preset switching voltage. It is not required to limit the specific method used to perform voltage detection and comparison. For example, both digital processing and analog comparison methods can obtain the comparison result between the input voltage DC_IN and the preset switching voltage, and thus both can complete the power supply path switching according to the working process described in this embodiment.

[0080] Furthermore, when the input voltage DC_IN changes near the preset switching voltage, the voltage detection module 1 can update the switching control signal CTR based on the real-time detection results, enabling the power switching module 4 to promptly select the corresponding power supply path. When the input voltage DC_IN recovers from below the preset switching voltage to a level not lower than the preset switching voltage, the power supply path switches back to the first power supply path 2; when the input voltage DC_IN drops below the preset switching voltage again, it switches back to the second power supply path 3. Therefore, the power management system can automatically switch power supply paths according to changes in the input voltage DC_IN without manual intervention or reconfiguration of system parameters.

[0081] In one embodiment, the switching control signal CTR may include multiple control signals, and different combinations of control signals correspond to different power supply paths, which can be configured according to the control requirements of the power switching module 4.

[0082] To solve the above-mentioned technical problems, the present invention provides a power supply management method, applied to the power supply management system described above, the method comprising: Detect the input voltage DC_IN provided by the input power supply; The switching control signal CTR is generated based on the comparison result between the input voltage DC_IN and the preset switching voltage; The first power supply path 2 or the second power supply path 3 is activated based on the switching control signal CTR. The first power supply path 2 is used to enable the input power supply to directly supply power to the circuit to be powered, and the second power supply path 3 is used to enable the input power supply to supply power to the circuit to be powered after passing through the boost module U2.

[0083] As a preferred embodiment, a switching control signal CTR is generated based on a comparison between the input voltage DC_IN and a preset switching voltage, including: When the input voltage DC_IN is not lower than the preset switching voltage, the first switching control signal CTR1 is output to turn on the first power supply path 2; When the input voltage DC_IN is lower than the preset switching voltage, the second switching control signal CTR2 is output to turn on the second power supply path 3.

[0084] For a description of the power supply management method provided by this invention, please refer to the above system embodiments; the invention itself will not be described in detail here.

[0085] To solve the above-mentioned technical problems, the present invention provides a power supply management device, comprising: The detection unit is used to detect the input voltage DC_IN provided by the input power supply; The generation unit is used to generate a switching control signal CTR based on the comparison result between the input voltage DC_IN and the preset switching voltage. The conduction unit is used to conduct the first power supply path 2 or the second power supply path 3 based on the switching control signal CTR. The first power supply path 2 is used to enable the input power supply to directly supply power to the circuit to be powered, and the second power supply path 3 is used to enable the input power supply to supply power to the circuit to be powered after passing through the boost module U2.

[0086] In a preferred embodiment, the generating unit is specifically used for: When the input voltage DC_IN is not lower than the preset switching voltage, the first switching control signal CTR1 is output to turn on the first power supply path 2; When the input voltage DC_IN is lower than the preset switching voltage, the second switching control signal CTR2 is output to turn on the second power supply path 3.

[0087] For a description of the power supply management equipment provided by this invention, please refer to the above system embodiments; this invention will not be described in detail here.

[0088] To solve the above-mentioned technical problems, the present invention provides a power supply management device, comprising: Memory, used to store computer programs; A processor is used to implement the steps of the power management method described above when executing a computer program.

[0089] The computer-readable storage medium of the present invention stores a computer program, which, when executed by a processor, implements the steps of the power management method described above.

[0090] For a description of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0091] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply management system, characterized in that, include: The voltage detection module is used to detect the input voltage provided by the input power supply and output a switching control signal based on the comparison result between the input voltage and the preset switching voltage. The first power supply path is used to directly supply power to the circuit to be powered by the input power; The second power supply path includes a boost module, which is used to supply power to the circuit to be powered after the input power is passed through the boost module. A power switching module is used to respond to the switching control signal and turn on the first power supply path or the second power supply path.

2. The power supply management system as described in claim 1, characterized in that, The voltage detection module includes a voltage sampling circuit and a control circuit; The voltage sampling circuit is used to sample the input voltage; The control circuit is used to determine the comparison result between the input voltage and the preset switching voltage based on the sampled voltage output by the voltage sampling circuit, and to generate the switching control signal based on the comparison result.

3. The power supply management system as described in claim 2, characterized in that, The voltage sampling circuit includes a first sampling resistor and a second sampling resistor; The first sampling resistor and the second sampling resistor are connected in series between the input power supply and the ground terminal, and the connection point between the first sampling resistor and the second sampling resistor is connected to the control circuit.

4. The power supply management system as described in claim 3, characterized in that, The control circuit includes an analog-to-digital converter module and a controller; The analog-to-digital converter module is used to convert the sampled voltage of the analog quantity at the connection point between the first sampling resistor and the second sampling resistor into a digital signal, and output the digital signal to the controller; The controller is used to determine the comparison result between the input voltage and the preset switching voltage based on the digital signal, so as to generate the switching control signal based on the comparison result.

5. The power supply management system as described in claim 3, characterized in that, The control circuit includes a comparator; The comparator is used to compare the sampled voltage at the connection point between the first sampling resistor and the second sampling resistor with the reference voltage, so as to generate the switching control signal based on the comparison result; The reference voltage is used in conjunction with a voltage divider circuit consisting of the first sampling resistor and the second sampling resistor, so that the comparison result between the sampled voltage and the reference voltage corresponds to the comparison result between the input voltage and the preset switching voltage.

6. The power supply management system as described in claim 5, characterized in that, It also includes a reference voltage generation circuit for generating the reference voltage for comparison by the comparator.

7. The power supply management system as described in claim 1, characterized in that, The power switching module includes a dual-channel ideal diode. The first input terminal of the dual-channel ideal diode is connected to the first power supply path, the second input terminal of the dual-channel ideal diode is connected to the second power supply path, and the output terminal of the dual-channel ideal diode is connected to the circuit to be powered, for responding to the switching control signal to turn on the first power supply path or the second power supply path.

8. The power supply management system as described in any one of claims 1-7, characterized in that, Based on the comparison result between the input voltage and the preset switching voltage, a switching control signal is output, including: When the input voltage is not lower than the preset switching voltage, a switching control signal for turning on the first power supply path is output; when the input voltage is lower than the preset switching voltage, a switching control signal for turning on the second power supply path is output.

9. A power supply management method, characterized in that, Applied to the power supply management system as described in any one of claims 1-8, the method comprises: Detect the input voltage supplied by the input power supply; A switching control signal is generated based on the comparison result between the input voltage and the preset switching voltage; The first power supply path or the second power supply path is activated based on the switching control signal, wherein the first power supply path is used to enable the input power supply to directly supply power to the circuit to be powered, and the second power supply path is used to enable the input power supply to supply power to the circuit to be powered after passing through the boost module.

10. The power supply management method as described in claim 9, characterized in that, A switching control signal is generated based on the comparison result between the input voltage and the preset switching voltage, including: When the input voltage is not lower than the preset switching voltage, a first switching control signal is output to turn on the first power supply path; When the input voltage is lower than the preset switching voltage, a second switching control signal is output to turn on the second power supply path.

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