Multi-power redundant power supply circuit, control method and system

Abstract

The invention provides a multi-power-source redundant power supply circuit and a control method and system. The multi-power-source redundant power supply circuit comprises a power source priority control module, a multi-path current limiting module, a constant electricity servo module, an alarm module and a control module. The priority module carries out arbitration according to each path of input voltage and a preset priority, realizes redundant power supply, and outputs a main power supply rail and a power supply state. The multi-path current limiting module supplies power to the load after current limiting of the main power supply rail. And the constant electric servo module provides servo power for the control module by using an auxiliary power supply and a main power supply rail. The control module monitors the power supply state in real time and drives the alarm module when abnormal; and the alarm module outputs an alarm driving signal according to the boost to trigger abnormal warning. According to the circuit, the control method and the system, the functions of priority arbitration, multi-path isolation power supply, continuous state recording and real-time monitoring and alarming are integrated, a complete redundant power supply system which is high in reliability and easy to maintain is constructed, and the power supply continuity, the fault traceability and the field maintenance efficiency are improved.

Description

Technical Field

[0001] This invention belongs to the field of power management technology, specifically relating to a multi-power redundant power supply circuit, control method, and system. Background Technology

[0002] In high-reliability applications such as industrial control, automotive electronics, and medical equipment, the continuity and stability of power supply systems are crucial. Traditional redundant power supply solutions typically only achieve simple dual-path switching, which suffers from problems such as excessively long switching times, weak fault isolation capabilities, and a lack of real-time status monitoring and recording. Specifically, existing designs often employ centralized single-path outputs, which can easily lead to a power outage of the entire system if a short circuit occurs in any of the loads. Furthermore, when both primary and backup power supplies fail, critical control modules cannot save their fault states due to power loss, affecting subsequent analysis and system recovery. In addition, most solutions lack effective local alarm and status feedback mechanisms, making it difficult to quickly locate power supply faults and increasing maintenance complexity and downtime. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a multi-power redundant power supply circuit, control method, and system to solve the aforementioned problems. This circuit, control method, and system integrate priority arbitration, multi-channel isolated power supply, continuous status recording, and real-time monitoring and alarm functions, constructing a highly reliable and easy-to-maintain complete redundant power supply system, thereby improving power supply continuity, fault traceability, and on-site maintenance efficiency.

[0004] To address the aforementioned technical problems, this invention provides a multi-power redundant power supply circuit, comprising a power priority control module, a multi-channel current limiting module, a constant power servo module, an alarm module, and a control module; wherein: The power priority control module is used to acquire several power supply terminal voltages, perform priority arbitration based on the several power supply terminal voltages and preset priorities to achieve redundant power supply of the input power, output the main power supply rail signal to the multi-channel current limiting module, constant power servo module, alarm module and load end, and output several power status signals corresponding to the power supply terminal voltages to the control module. The multi-channel current limiting module performs multi-channel current limiting based on the main power supply rail signal and outputs several power supply signals to the load end; The constant power servo module is used to acquire auxiliary power signals and main power rail signals, and to perform servo power supply based on the auxiliary power signals and main power rail signals, and output servo power supply signals to the control module. The control module monitors and records the voltage status of the power supply terminal in real time based on the servo power supply signal and several power status signals. When the voltage status of the power supply terminal is abnormal, it outputs a drive signal to the alarm module. The alarm module performs boost driving based on the drive signal and the main power rail signal, and outputs an alarm drive signal to trigger an abnormal alarm.

[0005] In the above scheme, a power priority control module performs preset priority arbitration and seamless switching on the voltages of multiple power supply terminals, achieving redundant power supply for the input power and a stable main power rail signal for the output. The main power rail signal is multi-channel current limited by a multi-channel current limiting module, outputting several power supply signals to the load terminal, realizing independent power supply and protection for load zones, ensuring that a fault in a single load branch does not affect the overall operation. The constant power servo module acquires the auxiliary power supply and main power rail signal, and continuously supplies power to the control module through servo power supply when the input is abnormal, ensuring that the voltage status and fault information of the power supply terminals are stored non-volatilely. The control module monitors and records the power status signal in real time, realizing continuous monitoring and event recording, and outputs a drive signal to the alarm module when an abnormality occurs. The alarm module performs boost drive based on the drive signal and the main power rail signal, outputting an alarm drive signal to trigger an abnormal alarm, realizing rapid fault location. The above scheme integrates priority arbitration, multi-channel isolated power supply, continuous status recording, and real-time monitoring and alarm functions in a single circuit structure, constructing a highly reliable and easy-to-maintain complete redundant power supply system, significantly improving power supply continuity, fault traceability, and on-site maintenance efficiency.

[0006] Furthermore, the power priority control module includes a power selection controller and several power channel switching units. The power selection controller includes several interface groups, a power status output terminal group, and a power selection output terminal; wherein: For any of the power channel switching units, the input terminal of the power channel switching unit is electrically connected to the power supply terminal to obtain the power supply terminal voltage of the corresponding channel; The control terminal group of the power channel switch unit is electrically connected to the interface group corresponding to the power selection controller. The output terminals of each power channel switching unit are connected in parallel with the power selection controller's power supply output terminal, and together serve as the power supply output terminal of the power priority control module, so that the power priority control module can achieve redundant power supply of the input power and output the main power supply rail signal to the multi-channel current limiting module, constant power servo module and alarm module. The power status output terminal group serves as the power status signal output terminal of the power priority control module, so that the power priority control module outputs several power status signals corresponding to the power supply terminal voltage to the control module.

[0007] In the above scheme, each power channel switching unit independently acquires the power supply voltage and is uniformly scheduled by the power selection controller through the corresponding interface group. Based on preset priorities and real-time detection results, the power selection controller sends control signals through the interface group, ensuring that only the highest-priority effective power channel is activated. The outputs of each channel switching unit are connected in parallel and converged to the selected power supply output terminal, forming a stable main power supply rail signal. Simultaneously, the power status output terminal group provides real-time feedback on the status of each power supply. This scheme achieves hardware-level rapid priority arbitration and status synchronization output, ensuring zero-interruption switching of the main power supply rail in the event of a single power supply failure, improving power supply continuity, and thus enhancing maintainability and overall reliability.

[0008] It should be noted that the power selection controller can be implemented using a priority control chip such as the LTC4417. The power status signal output by the power status output group, such as the VALID signal, can be in open-drain output form for easy connection with the control module and to achieve real-time status monitoring.

[0009] Furthermore, any interface group of the power selection controller includes a power detection input terminal and a gate control output terminal, and any control terminal group of the power channel switching unit includes a first control terminal and a second control terminal; wherein: For any interface group of the power selection controller, the power detection input terminal is electrically connected to the first control terminal of the corresponding power channel switching unit; The gate control output terminal is electrically connected to the second control terminal of the corresponding power channel switching unit.

[0010] In the above scheme, real-time, dedicated monitoring of the power supply voltage status is achieved by electrically connecting the power detection input terminal of the power selection controller to the first control terminal of the power channel switching unit; simultaneously, its gate control output terminal is electrically connected to the second control terminal of the unit to provide an independent switching drive signal. This scheme achieves physical separation of status detection and power control: the detection loop feeds back the voltage status to the controller for arbitration, and the control loop independently and accurately drives the corresponding channel switching unit to turn on and off based on the arbitration result. This reduces crosstalk and delay between signals, ensures the real-time performance and accuracy of status sampling and switching response, simplifies interface design, and improves the reliability of circuit operation and the maintainability of the module.

[0011] It should be noted that the power selection controller can be set to determine the validity of the power supply voltage by being higher than a specific undervoltage threshold (e.g., 0.85V) and higher than another operating voltage threshold (e.g., 2.5V). This determination logic is independent of the voltage level and is only related to the preset pin priority order.

[0012] Furthermore, the power channel switching unit includes a first MOSFET and a second MOSFET; wherein: The source of the first MOS transistor serves as the input terminal of the power channel switching unit. The input terminal is electrically connected to the power supply terminal and is used to obtain the power supply terminal voltage of the corresponding path. The gate of the first MOS transistor serves as the first control terminal of the power channel switching unit, and the first control terminal is electrically connected to the power detection input terminal of the corresponding interface group. The drain of the first MOSFET is electrically connected to the drain of the second MOSFET; The source of the second MOSFET serves as the output terminal of the power channel switching unit, and the output terminal is electrically connected to the power selection output terminal of the power selection controller. The gate of the second MOS transistor serves as the second control terminal of the power channel switching unit, and the second control terminal is electrically connected to the gate control output terminal of the corresponding interface group.

[0013] In the above scheme, the gate of the first MOSFET is electrically connected to the power detection input terminal of the power selection controller through the first control terminal to monitor the power supply voltage; the gate of the second MOSFET is electrically connected to the corresponding gate control output terminal through the second control terminal to control the conduction and shutdown of the channel. The first and second MOSFETs are connected in series, and their control terminals are separate, so that the power channel switching unit can quickly cut off the power supply path when the power supply voltage is abnormal, and the characteristics of the MOSFETs are used to achieve electrical isolation when turned off, thereby improving the switching reliability and safety of each power supply channel. The series connection of the two MOSFETs reduces the risk of malfunction, while sharing the voltage stress, improving the durability and overall stable switching performance of the power channel switching unit.

[0014] It should be noted that the first and second MOSFETs can specifically be P-channel MOSFETs. Alternatively, the switching function of the power channel switching unit can also be implemented by a parallel scheme composed of electromechanical components such as relays.

[0015] Furthermore, the multi-channel current limiting module includes several current limiting units; wherein: The input terminals of each current limiting unit are connected in parallel to each other and together serve as the input terminal of the multi-channel current limiting module for receiving the main power supply rail signal; The output terminals of the plurality of current limiting units are collectively used as the output terminal of the multi-channel current limiting module, so that the multi-channel current limiting module outputs a plurality of power supply signals to the load terminal; For any of the current limiting units, the grounding terminal of the current limiting unit is grounded.

[0016] In the above scheme, several parallel current-limiting units are set up. The input terminals of each current-limiting unit receive the main power supply rail signal together, and the output terminals independently output power supply signals to the load terminal. The grounding terminal of each current-limiting unit is grounded. This structure allows each power supply branch to operate independently. When any load branch experiences an anomaly, only the current-limiting protection of the corresponding current-limiting unit is triggered, cutting off the power supply signal for that branch, while other current-limiting units and the main power supply rail signal remain normal. This achieves electrical isolation of load-side faults, effectively avoiding overall power outages caused by single-branch load faults, and supports providing independent power supply for different loads, improving the reliability, safety, and maintainability of the power supply.

[0017] It should be noted that the current limiting unit can be implemented using a current limiting switch chip (such as TPS2557), and the current limiting value of each current limiting unit can be set independently according to the load requirements (e.g., 1A, 1.5A). Alternatively, the current limiting value can also be adjusted in software through a DAC combined with a digital potentiometer to achieve dynamic management of zoned power.

[0018] Furthermore, the constant-power servo module includes a current-limiting unit, a first diode, a second diode, and a voltage regulator unit; wherein: The input terminal of the current limiting unit serves as the first input terminal of the constant power servo module. The first input terminal is electrically connected to the auxiliary power supply and is used to acquire the auxiliary power supply signal. The output terminal of the current limiting unit is electrically connected to the anode of the first diode; The grounding terminal of the current limiting unit is grounded; The cathode of the first diode is electrically connected to the cathode of the second diode; The anode of the second diode serves as the second input terminal of the constant power servo module, used to acquire the main power rail signal; The input terminal of the voltage regulator unit is electrically connected to the cathode of the second diode; The output terminal of the voltage regulator unit serves as the output terminal of the constant power servo module, outputting a servo power supply signal to the control module.

[0019] In the above scheme, the automatic selection and seamless switching of power supply between the auxiliary power supply and the main power rail is achieved through the coordinated connection of the current limiting unit, the first diode, the second diode, and the voltage regulation unit. Specifically, the main power rail signal passes through the second diode, and the auxiliary power supply signal passes through the current limiting unit and the first diode, with their cathodes connected in parallel before being input to the voltage regulation unit. This connection constitutes an automatic selection path, where the higher voltage automatically supplies power to subsequent circuits and isolates the lower voltage or failed side. The combined power supply is processed by the voltage regulation unit, which outputs a stable servo power supply signal to the control module. Thus, when the main power rail is abnormal, the auxiliary power supply can seamlessly take over the power supply, ensuring continuous power supply and status maintenance; at the same time, the current limiting unit and the voltage regulation unit ensure power quality and safety, and diode isolation prevents reverse current surges between power supplies, improving reliability and data retention capabilities.

[0020] It should be noted that the first and second diodes can specifically be Schottky diodes to reduce voltage drop. The voltage regulation unit can be a low-dropout linear regulator (LDO) to output a stable 3.3V servo voltage. Alternatively, the voltage regulation unit can also be a low-power DC-DC converter to improve power conversion efficiency. In the event of a failure of both the main power supply and the backup power supply, the constant-power servo module ensures continuous power supply for at least 30ms, sufficient to complete critical data saving and fault log writing.

[0021] Furthermore, the alarm module includes a boost unit and an inductor; wherein: The input terminal of the boost unit serves as the first input terminal of the alarm module. The first input terminal is electrically connected to the power priority control module and is used to acquire the main power supply rail signal. The enable terminal of the boost unit serves as the second input terminal of the alarm module. The second input terminal is electrically connected to the control module and is used to acquire the drive signal. The output terminal of the boost unit serves as the output terminal of the alarm module, enabling the alarm module to output an alarm drive signal.

[0022] In the above scheme, a boost unit is configured so that its input terminal receives the main power rail signal, and its enable terminal receives the drive signal from the control module. When the control module outputs the drive signal, the enable terminal of the boost unit is activated, and the boost unit begins to work, boosting the input main power rail signal to the required voltage and outputting an alarm drive signal from its output terminal. This scheme directly utilizes the stable main power rail signal after priority arbitration as the energy source, and only activates when triggered by the control signal in case of an anomaly, achieving high reliability and rapid response of the alarm function. This modular structure simplifies the alarm drive circuit, reduces standby power consumption, and improves the system's integration and maintainability.

[0023] It should be noted that the alarm drive signal output by the boost unit can be used to drive the buzzer to emit a long sound or the LED light to flash, so as to realize the sound and light alarm and facilitate the rapid location of the fault.

[0024] The present invention also provides a control method for a multi-power redundant power supply circuit, applied to a multi-power redundant power supply circuit as described in the present invention, comprising the following steps: The control module acquires several power status signals in real time. The voltage status of each power supply terminal is determined based on the aforementioned power supply status signals. When an abnormal voltage condition is detected, the abnormal voltage condition at the power supply end is recorded based on the servo power supply signal, and a drive signal is output to the alarm module so that the alarm module triggers an abnormal alarm.

[0025] In the above scheme, the control module acquires several power supply status signals in real time and determines the voltage status of each power supply terminal based on these signals. When an abnormal voltage status is detected, the control module records the abnormal voltage status of the power supply terminal based on the servo power supply signal and outputs a drive signal to the alarm module to trigger an abnormal alarm. This scheme achieves real-time monitoring of the power supply terminal voltage status through continuous monitoring and judgment by the control module; utilizes the servo power supply signal to ensure reliable recording of abnormal statuses even when power supply is abnormal, guaranteeing the persistent storage of fault information; and simultaneously, drives the alarm module by outputting a drive signal, enabling rapid response and alarm for abnormal situations, improving the traceability, location speed, and overall maintenance efficiency of power supply faults.

[0026] This invention also provides a multi-power redundant power supply system, including a multi-power redundant power supply device and a control module. The multi-power redundant power supply device includes a housing and a circuit board disposed within the housing. The circuit board integrates the power priority control module, multi-channel current limiting module, constant power servo module, and alarm module as described above. The power priority control module is electrically connected to the power supply terminal so that the power priority control module can obtain several power supply terminal voltages. The power priority control module is electrically connected to the load end, so that the power priority control module outputs the main power supply rail signal to the load end; The multi-channel current limiting module is electrically connected to the load terminal so that the multi-channel current limiting module outputs the main power supply rail signal to the load terminal; The constant-power servo module is electrically connected to the control module so that the constant-power servo module outputs a servo power supply signal to the control module. The alarm module is electrically connected to the control module so that when the voltage at the power supply terminal is abnormal, the alarm module receives the drive signal and then outputs an alarm drive signal to trigger an abnormal alarm.

[0027] In the above scheme, the power priority control module acquires several power supply voltages, performs priority arbitration and seamless switching, and outputs the main power supply rail signal to the load end; the multi-channel current limiting module receives the main power supply rail signal and outputs several power supply signals to the load end, realizing independent power supply and protection; the constant power servo module outputs servo power supply signals to the control module to ensure its continuous operation for monitoring status and recording anomalies; the alarm module receives drive signals and outputs alarm drive signals to trigger abnormal alarms. This scheme achieves complete functionality from power input, priority management, load power supply to status monitoring and fault alarms, reducing external wiring and improving power supply reliability, maintenance convenience, and engineering applicability.

[0028] Furthermore, the circuit board edge is provided with several stamp hole interfaces; the stamp hole interfaces include an input interface, an output interface, a constant power interface, a control signal interface, and an alarm drive interface; wherein: The power priority control module is electrically connected to the power supply terminal through the input interface, so that the power priority control module can obtain several power supply terminal voltages. The power priority control module is electrically connected to the load end through the output interface, so that the power priority control module outputs the main power supply rail signal to the load end. The multi-channel current limiting module is electrically connected to the load end through the output interface, so that the multi-channel current limiting module outputs the main power supply rail signal to the load end; The constant power servo module is electrically connected to the control module through the constant power interface, so that the constant power servo module outputs a servo power supply signal to the control module; The alarm module is electrically connected to the control module through the control signal interface, so that when the voltage at the power supply terminal is abnormal, the alarm module receives the drive signal and then outputs an alarm drive signal through the alarm drive interface to trigger an abnormal alarm.

[0029] In the above solution, a stamp-hole interface, including an input interface, an output interface, a constant power interface, a control signal interface, and an alarm drive interface, is set on the edge of the circuit board, achieving a clear and standardized electrical connection with the external power supply, load, and control module. Each interface is physically separated and functionally independent: the input interface connects to the power supply, the output interface connects to the load, the constant power interface connects to the control module, and the control signal interface and alarm drive interface transmit drive signals and alarm drive signals respectively. This solution allows multiple power inputs, main power rail signal outputs, servo power signals, control signals, and alarm drive signals to be transmitted via dedicated paths, effectively avoiding crosstalk between signals and improving the reliability and signal integrity of the electrical connection. The stamp-hole interface facilitates the insertion, removal, and replacement of the power supply module as an independent unit, improving maintenance convenience, while the compact layout optimizes the utilization of the circuit board area. Overall, this interface design enhances the module's packaging independence, integration convenience, and maintainability.

[0030] It should be noted that the stamp hole interface design brings all power and signal rails to the board edge, making the multi-power redundant power supply device a standardized module, which can shorten the mean time to repair (MTTR). Alternatively, the interface can also use gold fingers or floating connectors to achieve a similar rapid maintenance effect. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a multi-power redundant power supply circuit architecture provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the power priority control module circuit in a multi-power redundant power supply circuit according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the circuit principle of a multi-current limiting module in a multi-power redundant power supply circuit according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the constant-power servo module circuit in a multi-power redundant power supply circuit according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the alarm module circuit in a multi-power redundant power supply circuit according to an embodiment of the present invention; Figure 6 This is a schematic flowchart of a control method for a multi-power redundant power supply circuit according to an embodiment of the present invention. Detailed Implementation

[0032] 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.

[0033] Please see Figure 1 This embodiment provides a multi-power redundant power supply circuit, including a power priority control module, a multi-channel current limiting module, a constant power servo module, an alarm module, and a control module; wherein: The power priority control module is used to acquire several power supply terminal voltages, perform priority arbitration based on the several power supply terminal voltages and preset priorities to achieve redundant power supply of the input power, output the main power supply rail signal to the multi-channel current limiting module, constant power servo module, alarm module and load end, and output several power status signals corresponding to the power supply terminal voltages to the control module. The multi-channel current limiting module performs multi-channel current limiting based on the main power supply rail signal and outputs several power supply signals to the load end; The constant power servo module is used to acquire auxiliary power signals and main power rail signals, and to perform servo power supply based on the auxiliary power signals and main power rail signals, and output servo power supply signals to the control module. The control module monitors and records the voltage status of the power supply terminal in real time based on the servo power supply signal and several power status signals. When the voltage status of the power supply terminal is abnormal, it outputs a drive signal to the alarm module. The alarm module performs boost driving based on the drive signal and the main power rail signal, and outputs an alarm drive signal to trigger an abnormal alarm.

[0034] In this embodiment, a power priority control module performs preset priority arbitration and seamless switching on the voltages of multiple power supply terminals, achieving redundant power supply for the input power and a stable main power rail signal for the output. The main power rail signal is multi-channel current limited by a multi-channel current limiting module, outputting several power supply signals to the load terminals, realizing independent power supply and protection for load zones, ensuring that a fault in a single load branch does not affect the overall operation. The constant power servo module acquires the auxiliary power supply and main power rail signal, and continuously supplies power to the control module through servo power supply when the input is abnormal, ensuring that the voltage status and fault information of the power supply terminals are stored non-volatilely. The control module monitors and records the power status signal in real time, realizing continuous monitoring and event recording, and outputs a drive signal to the alarm module when an abnormality occurs. The alarm module performs boost drive based on the drive signal and the main power rail signal, outputting an alarm drive signal to trigger an abnormal alarm, realizing rapid fault location. This embodiment integrates priority arbitration, multi-channel isolated power supply, continuous status recording, and real-time monitoring and alarm functions in a single circuit structure, constructing a highly reliable and easy-to-maintain complete redundant power supply system, significantly improving power supply continuity, fault traceability, and on-site maintenance efficiency.

[0035] Furthermore, the power priority control module includes a power selection controller and several power channel switching units. The power selection controller includes several interface groups, a power status output terminal group, and a power selection output terminal; wherein: For any of the power channel switching units, the input terminal of the power channel switching unit is electrically connected to the power supply terminal to obtain the power supply terminal voltage of the corresponding channel; The control terminal group of the power channel switch unit is electrically connected to the interface group corresponding to the power selection controller. The output terminals of each power channel switching unit are connected in parallel with the power selection controller's power supply output terminal, and together serve as the power supply output terminal of the power priority control module, so that the power priority control module can achieve redundant power supply of the input power and output the main power supply rail signal to the multi-channel current limiting module, constant power servo module and alarm module. The power status output terminal group serves as the power status signal output terminal of the power priority control module, so that the power priority control module outputs several power status signals corresponding to the power supply terminal voltage to the control module.

[0036] In this embodiment, each power channel switching unit independently acquires the power supply voltage and is uniformly scheduled by the power selection controller through the corresponding interface group. Based on preset priorities and real-time detection results, the power selection controller sends control signals through the interface group, ensuring that only the highest-priority effective power channel is activated. The outputs of each channel switching unit are connected in parallel and converged to the selected power supply output terminal, forming a stable main power supply rail signal. Simultaneously, the power status output terminal group provides real-time feedback on the status of each power supply. This embodiment achieves hardware-level fast priority arbitration and status synchronization output, ensuring zero-interruption switching of the main power supply rail in the event of a single power supply failure, improving power supply continuity, and thus enhancing maintainability and overall reliability.

[0037] Furthermore, any interface group of the power selection controller includes a power detection input terminal and a gate control output terminal, and any control terminal group of the power channel switching unit includes a first control terminal and a second control terminal; wherein: For any interface group of the power selection controller, the power detection input terminal is electrically connected to the first control terminal of the corresponding power channel switching unit; The gate control output terminal is electrically connected to the second control terminal of the corresponding power channel switching unit.

[0038] In this embodiment, by electrically connecting the power detection input terminal of the power selection controller to the first control terminal of the power channel switching unit, real-time, dedicated monitoring of the power supply voltage status is achieved. Simultaneously, its gate control output terminal is electrically connected to the second control terminal of the unit to provide an independent switching drive signal. This embodiment achieves physical separation of status detection and power control: the detection loop feeds back the voltage status to the controller for arbitration, and the control loop independently and accurately drives the corresponding channel switching unit to turn on and off based on the arbitration result. This reduces crosstalk and delay between signals, ensures the real-time performance and accuracy of status sampling and switching response, simplifies interface design, and improves the reliability of circuit operation and the maintainability of the module.

[0039] Furthermore, the power channel switching unit includes a first MOSFET and a second MOSFET; wherein: The source of the first MOS transistor serves as the input terminal of the power channel switching unit. The input terminal is electrically connected to the power supply terminal and is used to obtain the power supply terminal voltage of the corresponding path. The gate of the first MOS transistor serves as the first control terminal of the power channel switching unit, and the first control terminal is electrically connected to the power detection input terminal of the corresponding interface group. The drain of the first MOSFET is electrically connected to the drain of the second MOSFET; The source of the second MOSFET serves as the output terminal of the power channel switching unit, and the output terminal is electrically connected to the power selection output terminal of the power selection controller. The gate of the second MOS transistor serves as the second control terminal of the power channel switching unit, and the second control terminal is electrically connected to the gate control output terminal of the corresponding interface group.

[0040] In this embodiment, the gate of the first MOSFET is electrically connected to the power detection input terminal of the power selection controller via a first control terminal to monitor the power supply voltage. The gate of the second MOSFET is electrically connected to the corresponding gate control output terminal via a second control terminal to control the conduction and shutdown of the channel. The first and second MOSFETs are connected in series, and their control terminals are separate, enabling the power channel switching unit to quickly cut off the power supply path when the power supply voltage is abnormal. The MOSFET characteristics are utilized to achieve electrical isolation during shutdown, thereby improving the switching reliability and safety of each power supply channel. The series connection of the two MOSFETs reduces the risk of malfunction and shares voltage stress, improving the durability and overall stable switching performance of the power channel switching unit.

[0041] Please see Figure 2 In one embodiment, the power priority control module of the multi-power redundant power supply module includes a power selection controller and multiple power channel switching units.

[0042] The power selection controller uses the LTC4417IUF#PBF chip U1, which includes several interface groups, a power status output group, and a power selection output terminal. In this embodiment, the interface groups correspond to the three power input channels of chip U1, the power status output group corresponds to the three open-drain output pins VALID1, VALID2, and VALID3 of chip U1, which are used to output the main power status signal, the backup power 1 status signal, and the backup power 2 status signal, respectively, and the power selection output terminal corresponds to the VOUT pin of chip U1, which is used to form and output the system main power rail VDD_5V_UPS.

[0043] The multiple power channel switching units are used to receive three external power inputs, including the main power supply, backup power supply 1, and backup power supply 2. Each power channel switching unit is composed of two P-channel MOSFETs connected in series. Specifically, the first circuit consists of Q1 and Q2, the second circuit consists of Q3 and Q4, and the third circuit consists of Q5 and Q6.

[0044] For any of the power channel switching units, the source of its first MOSFET serves as the input terminal of the power channel switching unit and is electrically connected to the corresponding power supply terminal to obtain the power supply voltage; the gate of its first MOSFET serves as the first control terminal of the unit and is electrically connected to the power detection input terminal of the corresponding interface group of the power selection controller, specifically connected to the VS1, VS2, or VS3 pin of the LTC4417 chip U1; the drain of its first MOSFET is electrically connected to the drain of the second MOSFET of the power channel switching unit; the source of the second MOSFET of the power channel switching unit serves as the output terminal of the power channel switching unit; the gate of the second MOSFET of the power channel switching unit serves as the second control terminal of the unit and is electrically connected to the gate control output terminal of the corresponding interface group of the power selection controller, specifically connected to the G1, G2, or G3 pin of the LTC4417 chip U1.

[0045] The outputs of each power channel switching unit are connected in parallel and jointly connected to the power selection controller's power supply output terminal, namely the VOUT pin of the LTC4417 chip U1. This serves as the power supply output terminal for the power priority control module, enabling redundant power supply and seamless switching of the input power, and outputting a stable main power rail signal VDD_5V_UPS to subsequent circuits and loads. The power status output terminal group of the power selection controller, namely the VALID1, VALID2, and VALID3 pins, serves as status signal output terminals, used to output the corresponding main power status signal, backup power supply 1 status signal, and backup power supply 2 status signal to the control module.

[0046] It should be noted that in this embodiment, the LTC4417 chip U1 monitors the input voltage of each channel in real time through its VS1, VS2, and VS3 pins (power detection input terminals). When the input voltage is higher than 2.5V and not lower than the internal 0.85V undervoltage threshold, the chip U1 determines that the power supply is valid. The arbitration logic is based on a preset pin priority order, i.e., VS1 (main power supply) is the highest, VS2 (backup power supply 1) is the next highest, and VS3 (backup power supply 2) is the lowest. According to this priority, the chip U1 only drives the two MOSFETs corresponding to the highest priority valid power supply channel to be fully turned on through the G1, G2, or G3 pins (gate control output terminals), while the other channels remain off. If the current power supply drops abnormally, the chip U1 will immediately turn off the MOSFETs of the corresponding channel to achieve electrical isolation between the output terminal and the faulty power supply, and automatically and quickly switch to the other currently valid and highest priority power supply, thereby ensuring continuous and uninterrupted power supply to the main power rail VDD_5V_UPS. Meanwhile, the power status output group of chip U1 (VALID1, VALID2, VALID3 pins) outputs the corresponding status signals of main power supply, backup power supply 1, and backup power supply 2 in real time.

[0047] Furthermore, the multi-channel current limiting module includes several current limiting units; wherein: The input terminals of each current limiting unit are connected in parallel to each other and together serve as the input terminal of the multi-channel current limiting module for receiving the main power supply rail signal; The output terminals of the plurality of current limiting units are collectively used as the output terminal of the multi-channel current limiting module, so that the multi-channel current limiting module outputs a plurality of power supply signals to the load terminal; For any of the current limiting units, the grounding terminal of the current limiting unit is grounded.

[0048] In this embodiment, several parallel current-limiting units are configured. The input terminals of each current-limiting unit share the main power rail signal, while their output terminals independently output power signals to the load. Furthermore, the grounding terminal of each current-limiting unit is grounded. This structure allows each power supply branch to operate independently. When any load branch experiences an anomaly, only the current-limiting protection of the corresponding current-limiting unit is triggered, cutting off the power supply signal for that branch, while other current-limiting units and the main power rail signal remain normal. This achieves electrical isolation of load-side faults, effectively preventing overall power outages caused by single-branch load faults. Simultaneously, it supports providing independent power to different loads, improving the reliability, safety, and maintainability of the power supply.

[0049] Please see Figure 3 In one embodiment, the multi-channel current limiting output unit includes several current limiting units connected in parallel.

[0050] Specifically, the current limiting unit includes a first current limiting chip U2 and a second current limiting chip U3. The input terminals of each current limiting unit are connected in parallel to receive the main power supply rail signal VDD_5V_UPS. The output terminal of the first current limiting chip U2 outputs a first power supply signal VDD_5V_MAIN, and the output terminal of the second current limiting chip U3 outputs a second power supply signal VDD_5V_BACKUP. These two power supply signals together serve as the output of the multi-channel current limiting output unit, providing independent branch power supply for devices with different power requirements.

[0051] For any of the current limiting units, its ground terminal is grounded. Specifically, the current limiting setting pin (IMIT) of the first current limiting chip U2 is grounded through the first resistor R1, and the current limiting setting pin (IMIT) of the second current limiting chip U3 is grounded through the second resistor R2.

[0052] It should be noted that by configuring grounding resistors (R1 and R2) with different resistance values ​​for the IMIT pins of the first current-limiting chip U2 and the second current-limiting chip U3, the current-limiting protection threshold of each branch can be precisely set. In this embodiment, by selecting the corresponding resistor values, the current-limiting value of the U2 branch is configured to 1.5A, and the current-limiting value of the U3 branch is configured to 1A. This structure makes each power supply branch a current-limiting channel with an independent protection threshold. When any load branch experiences an abnormal overcurrent or short circuit, only the internal protection mechanism of the corresponding current-limiting chip will be triggered, thereby cutting off the power supply signal of that branch, while the output of the other current-limiting branch and the main power supply rail VDD_5V_UPS can maintain normal power supply. Thus, this design achieves precise electrical isolation of load-side faults, effectively preventing a single load fault from causing a complete power system interruption. While meeting the independent power supply requirements of multiple devices in different zones, it significantly improves the reliability, safety, and maintainability of the system power supply.

[0053] Furthermore, the constant-power servo module includes a current-limiting unit, a first diode, a second diode, and a voltage regulator unit; wherein: The input terminal of the current limiting unit serves as the first input terminal of the constant power servo module. The first input terminal is electrically connected to the auxiliary power supply and is used to acquire the auxiliary power supply signal. The output terminal of the current limiting unit is electrically connected to the anode of the first diode; The grounding terminal of the current limiting unit is grounded; The cathode of the first diode is electrically connected to the cathode of the second diode; The anode of the second diode serves as the second input terminal of the constant power servo module, used to acquire the main power rail signal; The input terminal of the voltage regulator unit is electrically connected to the cathode of the second diode; The output terminal of the voltage regulator unit serves as the output terminal of the constant power servo module, outputting a servo power supply signal to the control module.

[0054] In this embodiment, automatic optimization and seamless switching of power supply between the auxiliary power supply and the main power rail are achieved through the coordinated connection of the current limiting unit, the first diode, the second diode, and the voltage regulator unit. Specifically, the main power rail signal passes through the second diode, and the auxiliary power supply signal passes through the current limiting unit and the first diode, with their cathodes connected in parallel before being input to the voltage regulator unit. This connection constitutes an automatic optimization path, where the higher voltage automatically supplies power to subsequent circuits and isolates the lower voltage or failed side. The combined power supply is processed by the voltage regulator unit, which outputs a stable servo power supply signal to the control module. Thus, when the main power rail is abnormal, the auxiliary power supply can seamlessly take over the power supply, ensuring continuous power supply and status maintenance; at the same time, the current limiting unit and the voltage regulator unit ensure power quality and safety, and diode isolation prevents reverse current surges between power supplies, improving reliability and data retention capabilities.

[0055] Please see Figure 4 In one embodiment, the constant-power servo module of the multi-power redundant power supply module includes a current limiting unit, a first diode, a second diode, and a voltage regulating unit, for achieving uninterrupted servo power supply.

[0056] The current limiting unit is specifically a current limiting chip U4. The input terminal of the current limiting chip U4 serves as the first input terminal of the constant-power servo module, used to acquire the auxiliary power signal SERVO_POWER. The IMIT interface of the current limiting chip U4, i.e., the ground terminal, is grounded through resistor R3 and used to set the current limiting threshold. The output terminal of the current limiting chip U4 is electrically connected to the anode of the first diode D1.

[0057] Both the first diode D1 and the second diode D2 are Schottky diodes. The cathodes of the first diode D1 and the second diode D2 are electrically connected. The anode of the second diode D2 serves as the second input terminal of the constant power servo module, used to acquire the main power rail signal VDD_5V_UPS from the power priority control unit.

[0058] The voltage regulation unit is specifically a low-dropout linear regulator (LDO) chip U5. The input terminal of the LDO chip U5 is electrically connected to the cathode junction of the first diode D1 and the second diode D2. The output terminal of the LDO chip U5 serves as the output terminal of the constant-power servo module, outputting a stable constant-power servo rail SERVO_3V3 to power external microcontrollers (MCUs), real-time clocks (RTCs), latches, and other peripheral circuits.

[0059] It should be noted that the current limiting chip U4 sets the current limiting value through the resistor R3 connected to its IMIT interface. In this embodiment, it is configured to provide 1A current limiting protection to ensure the safety of the auxiliary power input. The main power rail VDD_5V_UPS and the current-limited auxiliary power supply SERVO_POWER are connected via an OR logic merging circuit through the second diode D2 and the first diode D1, respectively. This connection method forms an automatic optimal power supply path: when the main power rail voltage is normal, it supplies power to the subsequent circuits through the second diode D2. At this time, the first diode D1 is in a reverse cutoff state because the cathode potential is higher than the anode, thus isolating the auxiliary power supply; when the main power rail experiences an abnormal drop or failure, the auxiliary power supply SERVO_POWER can immediately and seamlessly take over the power supply through the first diode D1, thereby ensuring the continuity of the servo power supply. The merged power supply is input to the LDO chip U5 for voltage regulation, and finally outputs a stable and reliable 3.3V servo voltage. This design not only ensures the continuous operation of critical peripherals and the preservation of status information when the main power supply is abnormal, but also effectively prevents reverse current surges between power supplies through the isolation effect of diodes. Combined with configurable current limiting protection and voltage regulation functions, it improves the overall power supply reliability, safety and data retention capabilities of the module.

[0060] Furthermore, the alarm module includes a boost unit and an inductor; wherein: The input terminal of the boost unit serves as the first input terminal of the alarm module. The first input terminal is electrically connected to the power priority control module and is used to acquire the main power supply rail signal. The enable terminal of the boost unit serves as the second input terminal of the alarm module. The second input terminal is electrically connected to the control module and is used to acquire the drive signal. The output terminal of the boost unit serves as the output terminal of the alarm module, enabling the alarm module to output an alarm drive signal.

[0061] In this embodiment, a boost unit is configured so that its input terminal receives the main power rail signal, and its enable terminal receives the drive signal from the control module. When the control module outputs the drive signal, the enable terminal of the boost unit is activated, and the boost unit begins to operate, boosting the input main power rail signal to the required voltage and outputting an alarm drive signal from its output terminal. This embodiment directly utilizes the stable main power rail signal after priority arbitration as the energy source, and only activates when triggered by the control signal in case of an anomaly, achieving high reliability and rapid response of the alarm function. This modular structure simplifies the alarm drive circuit, reduces standby power consumption, and improves the system's integration and maintainability.

[0062] Please see Figure 5In one embodiment, the alarm module of the multi-power redundant power supply module includes a boost unit and an energy storage inductor, used to generate an alarm drive signal when the system is abnormal.

[0063] The boost unit is specifically a boost chip U6. The input terminal (VIN pin) of the boost chip U6 serves as the first input terminal of the alarm module, used to acquire the main power supply rail signal VDD_5V_UPS. The enable terminal (EN) of the boost chip U6 serves as the second input terminal of the alarm module, electrically connected to the control module, used to acquire the drive signal (I / O enable). The output terminal (SW) of the boost chip U6 serves as the output terminal of the alarm module, outputting the alarm drive signal BUZZER_OUT.

[0064] The energy storage inductor is specifically inductor L1. One end of inductor L1 is electrically connected to the VIN pin of the boost chip U6, and the other end is electrically connected to the output terminal (SW) of the boost chip U6, forming the core energy storage and energy transfer circuit of the boost converter.

[0065] It should be noted that the boost chip U6, inductor L1, and corresponding peripheral circuits together constitute a DC-DC boost converter. Under normal operating conditions, the enable terminal (EN) of the boost chip U6 is at an inactive level, the entire circuit is off, and the static power consumption is extremely low. When a power supply system malfunctions, the external control module outputs a valid drive signal (I / O enable) to the boost chip's enable terminal (EN) via the J1 interface. At this time, inductor L1 and the internal switching transistor of the boost chip U6 work together to periodically store and release energy, boosting the stable main power supply rail VDD_5V_UPS (e.g., 5V) obtained from the first input terminal after priority arbitration to the required higher voltage (e.g., 12V), and outputting a BUZZER_OUT signal from the output terminal. This alarm drive signal can be directly used to drive a buzzer and LED light with rated parameters of 12V / 50mA, realizing synchronized sound and light alarm, thereby helping maintenance personnel quickly detect and locate faults. This embodiment directly utilizes the main power rail as the energy source for the alarm function, and achieves efficient voltage conversion through an inductor and a dedicated boost chip, ensuring that the alarm circuit can obtain sufficient and stable driving voltage under abnormal conditions. It adopts an external signal triggering method to achieve fast response and on-demand start-up. This structure ensures high reliability of the alarm function while also featuring low standby power consumption, high integration, and easy maintenance.

[0066] Please see Figure 6 This embodiment also provides a control method for a multi-power redundant power supply circuit, applied to the multi-power redundant power supply circuit described above, including the following steps: Step S1: Acquire several power status signals in real time through the control module; Step S2: Determine the voltage status of each power supply terminal based on the aforementioned power supply status signals; Step S3: When an abnormal voltage state is detected, the abnormal voltage state of the power supply terminal is recorded based on the servo power supply signal, and a drive signal is output to the alarm module so that the alarm module triggers an abnormal alarm.

[0067] In this embodiment, the control module acquires several power supply status signals in real time and determines the voltage status of each power supply terminal based on these signals. When an abnormal voltage status is detected, the control module records the abnormal voltage status of the power supply terminal based on the servo power supply signal and outputs a drive signal to the alarm module to trigger an abnormal alarm. This embodiment achieves real-time monitoring of the power supply terminal voltage status through continuous monitoring and judgment by the control module; it utilizes the servo power supply signal to ensure reliable recording of abnormal statuses even when power supply is abnormal, guaranteeing the persistent storage of fault information; simultaneously, by outputting a drive signal to drive the alarm module, it achieves rapid response and alarm for abnormal situations, improving the traceability, location speed, and overall maintenance efficiency of power supply faults.

[0068] This embodiment also provides a multi-power redundant power supply system, including a multi-power redundant power supply device and a control module. The multi-power redundant power supply device includes a housing and a circuit board disposed within the housing. The circuit board integrates the power priority control module, multi-channel current limiting module, constant power servo module, and alarm module as described above. The power priority control module is electrically connected to the power supply terminal so that the power priority control module can obtain several power supply terminal voltages. The power priority control module is electrically connected to the load end, so that the power priority control module outputs the main power supply rail signal to the load end; The multi-channel current limiting module is electrically connected to the load terminal so that the multi-channel current limiting module outputs the main power supply rail signal to the load terminal; The constant-power servo module is electrically connected to the control module so that the constant-power servo module outputs a servo power supply signal to the control module. The alarm module is electrically connected to the control module so that when the voltage at the power supply terminal is abnormal, the alarm module receives the drive signal and then outputs an alarm drive signal to trigger an abnormal alarm.

[0069] In this embodiment, the power priority control module acquires several power supply terminal voltages, performs priority arbitration and seamless switching, and outputs a main power supply rail signal to the load terminal; the multi-channel current limiting module receives the main power supply rail signal and outputs several power supply signals to the load terminal, realizing independent power supply and protection; the constant power servo module outputs a servo power supply signal to the control module to ensure its continuous operation for monitoring status and recording anomalies; the alarm module receives a drive signal and outputs an alarm drive signal to trigger an anomaly alarm. This embodiment realizes complete functions from power input, priority management, load power supply to status monitoring and fault alarm, reduces external wiring, and improves power supply reliability, maintenance convenience, and engineering applicability.

[0070] Furthermore, the circuit board edge is provided with several stamp hole interfaces; the stamp hole interfaces include an input interface, an output interface, a constant power interface, a control signal interface, and an alarm drive interface; wherein: The power priority control module is electrically connected to the power supply terminal through the input interface, so that the power priority control module can obtain several power supply terminal voltages. The power priority control module is electrically connected to the load end through the output interface, so that the power priority control module outputs the main power supply rail signal to the load end. The multi-channel current limiting module is electrically connected to the load end through the output interface, so that the multi-channel current limiting module outputs the main power supply rail signal to the load end; The constant power servo module is electrically connected to the control module through the constant power interface, so that the constant power servo module outputs a servo power supply signal to the control module; The alarm module is electrically connected to the control module through the control signal interface, so that when the voltage at the power supply terminal is abnormal, the alarm module receives the drive signal and then outputs an alarm drive signal through the alarm drive interface to trigger an abnormal alarm.

[0071] In this embodiment, a stamp-hole interface, including an input interface, an output interface, a constant power interface, a control signal interface, and an alarm drive interface, is provided on the edge of the circuit board, achieving a clear and standardized electrical connection with the external power supply, load, and control module. Each interface is physically separate and functionally independent: the input interface connects to the power supply, the output interface connects to the load, the constant power interface connects to the control module, and the control signal interface and alarm drive interface transmit drive signals and alarm drive signals, respectively. This embodiment allows multiple power inputs, main power rail signal outputs, servo power signals, control signals, and alarm drive signals to be transmitted via dedicated paths, effectively avoiding crosstalk between signals and improving the reliability and signal integrity of the electrical connection. The stamp-hole interface facilitates the insertion, removal, and replacement of the power supply module as an independent unit, improving maintenance convenience, while the compact layout optimizes the utilization of the circuit board area. Overall, this interface design enhances the module's packaging independence, integration convenience, and maintainability.

[0072] In one embodiment, a multi-power redundant power supply system is provided, including a multi-power redundant power supply device and a control module. The multi-power redundant power supply device includes a housing and a circuit board disposed within the housing. The circuit board integrates the power priority control module, multi-channel current limiting module, constant power servo module and alarm module as described above. All power inputs, current limiting outputs, constant power servo, status signal drive and alarm drive signals are led out through stamp holes to form independent packaged units. The three-channel power priority switching, two-channel partition current limiting, constant power servo holding and audible and visual alarm functions are completed in a single printed circuit board. The multi-power redundant power supply module includes a power priority control module, a stamp hole input / output interface unit, a multi-channel current limiting module, a constant power servo module, and an alarm module. The power priority control module includes an LTC4417 chip U1 and six P-channel MOSFETs Q1~Q6, which are used to receive three external power inputs, namely the main power supply, backup power supply 1 and backup power supply 2, and arbitrate and switch according to preset priorities to form the system main power supply rail VDD_5V_UPS at the output end to power the core equipment. The stamp hole input / output interface unit includes stamp holes J1 and J2 located on the edge of the board, which are used to lead out all power input, output control signals and power supply signals, so as to realize modular design and convenient replacement. The multi-channel current limiting module includes current limiting chips U2 and U3. Current limiting chip U2 outputs VDD_5V_MAIN and provides 1.5A current limiting, while current limiting chip U3 outputs VDD_5V_BACKUP and provides 1A current limiting. The input terminals of both current limiting chips are connected in parallel to the main power supply rail VDD_5V_UPS, and the output terminals are led to stamp holes J1 and J2 respectively, realizing independent power supply for zones and local protection of branch circuits. The constant-power servo module includes a current limiting chip U4, a first diode D1, a second diode D2, and an LDO chip U5. After the SERVO_POWER is current-limited to 1A by the current limiting chip U4, it is combined with the main power supply rail VDD_5V_UPS through the first diode D1 and the second diode D1 respectively to form an OR gate. After being combined, it is input to the LDO chip U5 and outputs the constant-power servo rail SERVO_3V3, which is used to power the MCU, RTC and latch in the external control module. The alarm module includes a boost chip U6, whose input terminal is electrically connected to the main power supply rail VDD_5V_UPS. The enable terminal (EN) receives the drive signal (I / O enable) through the stamp hole J1, and the output terminal (SW) outputs the alarm drive signal BUZZER_OUT, which is led out through the stamp hole to drive the buzzer and LED light.

[0073] It should be noted that when three external power supplies are simultaneously connected to the VS1, VS2, and VS3 pins of the LTC4417 chip U1, chip U1 first compares each input voltage with its internal 0.85V undervoltage threshold. If the voltage is higher than 2.5V but not lower than 0.85V, it is considered valid. After validity confirmation, the arbitration logic determines the priority according to the pin order: VS1 is the highest, VS2 is the next highest, and VS3 is the lowest, regardless of the voltage level. If the main power supply is normal, the gate control output G1 is valid, making the P-channel MOSFETs Q1 and Q2 fully conduct, directly supplying the main power supply voltage to the selected power supply output (VOUT pin), while the other two remain off. If the main power supply abnormally drops to 0V, chip U1 immediately turns off the P-channel MOSFETs Q1 and Q2, electrically isolating the selected power supply output from the main power supply. If either backup power supply 1 or backup power supply 2 is still higher than 0.85V, it automatically switches to the currently valid and highest priority output, maintaining continuous power supply to the selected power supply output. The switching logic is the same when backup power supply 1 or backup power supply 2 fails, ensuring that the main power supply rail VDD_5V_UPS is not interrupted throughout the process. Meanwhile, the power status output group (VALID1, VALID2, VALID3 pins) of chip U1, namely the main power status signal, backup power supply 1 status signal, and backup power supply 2 status signal, are led out through the stamp hole, allowing the MCU in the control module to monitor the status of each power supply in real time.

[0074] Furthermore, the main power supply rail VDD_5V_UPS, while supplying the current limiting unit, also directly supplies power to the core equipment via the stamp hole. Two current limiting chips, U2 and U3, independently limit current and output separately, ensuring that a fault in any load branch only triggers the protection of that branch, without affecting the main power supply rail or other branches. The constant power servo module uses a diode or gate structure to achieve automatic optimization and seamless switching between the main power supply rail and the auxiliary power supply SERVO_POWER, ensuring a continuous and stable output of SERVO_3V3, guaranteeing that key components such as the MCU in the external control module can still maintain operation and status recording even in the event of power supply abnormalities. Upon receiving a drive signal (I / O enable) from the MCU in the external control module, the alarm module boosts the main power supply rail voltage to drive the buzzer and LED for audible and visual alarms, enabling rapid fault location and warning.

[0075] For example, the input signals include the main power supply, backup power supply 1, backup power supply 2, and SERVO_POWER input 5V. The output signals include the main equipment core power supply VDD_5V_UPS, the current-limiting outputs VDD_5V_MAIN and VDD_5V_BACKUP, the constant power servo output SERVO_3V3, the alarm drive output BUZZER_OUT, and three power status signals (main power status signal VALID1, backup power supply 1 status signal VALID2, and backup power supply 2 status signal VALID3). Under normal operating conditions, the three power inputs are normal, the output voltages are stable, VALID1 to VALID3 are in a high-impedance state, the input to the MCU in the control module is high, the alarm drive enable pin (EN) is low, BUZZER_OUT has no output, the buzzer and LED are silent, and the MCU in the control module continuously records the system log. In an abnormal situation, assuming the main power supply momentarily drops to 0V, chip U1 switches to backup power supply 1. VALID1 (main power status signal) outputs a low level, while VALID2 (backup power supply 1 status signal) and VALID3 (backup power supply 2 status signal) remain high. The downward transition of VALID1 triggers an MCU interrupt, writing the abnormal event to the log. Simultaneously, the MCU in the control module outputs a high level to the second input of the alarm module, causing BUZZER_OUT to drive a buzzer to sound continuously and an LED to flash, providing an abnormal warning. At this time, VDD_5V_UPS, VDD_5V_MAIN, VDD_5V_BACKUP, and SERVO_3V3 all maintain normal output, without affecting the operation of downstream equipment. The phenomenon is similar when backup power supply 1 or backup power supply 2 malfunctions.

[0076] In this embodiment, by integrating power priority arbitration, multiple independent current limiting outputs, constant power servo holding, and triggerable audible and visual alarm functions on a single board, highly reliable redundant power supply, load fault isolation, continuous status monitoring, and rapid fault location are achieved within a compact module. This overcomes the shortcomings of single-rail output and lack of status monitoring in traditional solutions, and improves the continuity, maintainability, and overall reliability of the system power supply.

[0077] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A multi-power redundant power supply circuit, characterized in that, It includes a power priority control module, a multi-channel current limiting module, a constant power servo module, an alarm module, and a control module; among which: The power priority control module is used to acquire several power supply terminal voltages, perform priority arbitration based on the several power supply terminal voltages and preset priorities to achieve redundant power supply of the input power, output the main power supply rail signal to the multi-channel current limiting module, constant power servo module, alarm module and load end, and output several power status signals corresponding to the power supply terminal voltages to the control module. The multi-channel current limiting module performs multi-channel current limiting based on the main power supply rail signal and outputs several power supply signals to the load end; The constant power servo module is used to acquire auxiliary power signals and main power rail signals, and to perform servo power supply based on the auxiliary power signals and main power rail signals, and output servo power supply signals to the control module. The control module monitors and records the voltage status of the power supply terminal in real time based on the servo power supply signal and several power status signals. When the voltage status of the power supply terminal is abnormal, it outputs a drive signal to the alarm module. The alarm module performs boost driving based on the drive signal and the main power rail signal, and outputs an alarm drive signal to trigger an abnormal alarm.

2. The multi-power redundant power supply circuit according to claim 1, characterized in that, The power priority control module includes a power selection controller and several power channel switching units. The power selection controller includes several interface groups, a power status output group, and a power selection output terminal; wherein: For any of the power channel switching units, the input terminal of the power channel switching unit is electrically connected to the power supply terminal to obtain the power supply terminal voltage of the corresponding channel; The control terminal group of the power channel switch unit is electrically connected to the interface group corresponding to the power selection controller. The output terminals of each power channel switching unit are connected in parallel with the power selection controller's power supply output terminal, and together serve as the power supply output terminal of the power priority control module, so that the power priority control module can achieve redundant power supply of the input power and output the main power supply rail signal to the multi-channel current limiting module, constant power servo module and alarm module. The power status output terminal group serves as the power status signal output terminal of the power priority control module, so that the power priority control module outputs several power status signals corresponding to the power supply terminal voltage to the control module.

3. The multi-power redundant power supply circuit according to claim 2, characterized in that, Any interface group of the power selection controller includes a power detection input terminal and a gate control output terminal, and any control terminal group of the power channel switching unit includes a first control terminal and a second control terminal; wherein: For any interface group of the power selection controller, the power detection input terminal is electrically connected to the first control terminal of the corresponding power channel switching unit; The gate control output terminal is electrically connected to the second control terminal of the corresponding power channel switching unit.

4. A multi-power redundant power supply circuit according to claim 3, characterized in that, The power channel switching unit includes a first MOSFET and a second MOSFET; wherein: The source of the first MOS transistor serves as the input terminal of the power channel switching unit. The input terminal is electrically connected to the power supply terminal and is used to obtain the power supply terminal voltage of the corresponding path. The gate of the first MOS transistor serves as the first control terminal of the power channel switching unit, and the first control terminal is electrically connected to the power detection input terminal of the corresponding interface group. The drain of the first MOSFET is electrically connected to the drain of the second MOSFET; The source of the second MOSFET serves as the output terminal of the power channel switching unit, and the output terminal is electrically connected to the power selection output terminal of the power selection controller. The gate of the second MOS transistor serves as the second control terminal of the power channel switching unit, and the second control terminal is electrically connected to the gate control output terminal of the corresponding interface group.

5. A multi-power redundant power supply circuit according to claim 1, characterized in that, The multi-channel rate limiting module includes several rate limiting units; wherein: The input terminals of each current limiting unit are connected in parallel to each other and together serve as the input terminal of the multi-channel current limiting module for receiving the main power supply rail signal; The output terminals of the plurality of current limiting units are collectively used as the output terminal of the multi-channel current limiting module, so that the multi-channel current limiting module outputs a plurality of power supply signals to the load terminal; For any of the current limiting units, the grounding terminal of the current limiting unit is grounded.

6. A multi-power redundant power supply circuit according to claim 1, characterized in that, The constant-power servo module includes a current-limiting unit, a first diode, a second diode, and a voltage regulator unit; wherein: The input terminal of the current limiting unit serves as the first input terminal of the constant power servo module. The first input terminal is electrically connected to the auxiliary power supply and is used to acquire the auxiliary power supply signal. The output terminal of the current limiting unit is electrically connected to the anode of the first diode; The grounding terminal of the current limiting unit is grounded; The cathode of the first diode is electrically connected to the cathode of the second diode; The anode of the second diode serves as the second input terminal of the constant power servo module, used to acquire the main power rail signal; The input terminal of the voltage regulator unit is electrically connected to the cathode of the second diode; The output terminal of the voltage regulator unit serves as the output terminal of the constant power servo module, outputting a servo power supply signal to the control module.

7. A multi-power redundant power supply circuit according to claim 1, characterized in that, The alarm module includes a boost unit and an inductor; wherein: The input terminal of the boost unit serves as the first input terminal of the alarm module. The first input terminal is electrically connected to the power priority control module and is used to acquire the main power supply rail signal. The enable terminal of the boost unit serves as the second input terminal of the alarm module. The second input terminal is electrically connected to the control module and is used to acquire the drive signal. The output terminal of the boost unit serves as the output terminal of the alarm module, enabling the alarm module to output an alarm drive signal.

8. A control method for a multi-power redundant power supply circuit, characterized in that, An application to a multi-power redundant power supply circuit as described in any one of claims 1 to 7, comprising the following steps: The control module acquires several power status signals in real time. The voltage status of each power supply terminal is determined based on the aforementioned power supply status signals. When an abnormal voltage condition is detected, the abnormal voltage condition at the power supply end is recorded based on the servo power supply signal, and a drive signal is output to the alarm module so that the alarm module triggers an abnormal alarm.

9. A multi-power redundant power supply system, characterized in that, The system includes a multi-power redundant power supply device and a control module. The multi-power redundant power supply device includes a housing and a circuit board disposed within the housing. The circuit board integrates a power priority control module, a multi-channel current limiting module, a constant power servo module, and an alarm module as described in any one of claims 1 to 7. The power priority control module is electrically connected to the power supply terminal so that the power priority control module can obtain several power supply terminal voltages. The power priority control module is electrically connected to the load end, so that the power priority control module outputs the main power supply rail signal to the load end; The multi-channel current limiting module is electrically connected to the load terminal so that the multi-channel current limiting module outputs the main power supply rail signal to the load terminal; The constant-power servo module is electrically connected to the control module so that the constant-power servo module outputs a servo power supply signal to the control module. The alarm module is electrically connected to the control module so that when the voltage at the power supply terminal is abnormal, the alarm module receives the drive signal and then outputs an alarm drive signal to trigger an abnormal alarm.

10. A multi-power redundant power supply system according to claim 9, characterized in that, The circuit board has several stamp hole interfaces along its edge; these stamp hole interfaces include input interfaces, output interfaces, constant power interfaces, control signal interfaces, and alarm drive interfaces; wherein: The power priority control module is electrically connected to the power supply terminal through the input interface, so that the power priority control module can obtain several power supply terminal voltages. The power priority control module is electrically connected to the load end through the output interface, so that the power priority control module outputs the main power supply rail signal to the load end. The multi-channel current limiting module is electrically connected to the load end through the output interface, so that the multi-channel current limiting module outputs the main power supply rail signal to the load end; The constant power servo module is electrically connected to the control module through the constant power interface, so that the constant power servo module outputs a servo power supply signal to the control module; The alarm module is electrically connected to the control module through the control signal interface, so that when the voltage at the power supply terminal is abnormal, the alarm module receives the drive signal and then outputs an alarm drive signal through the alarm drive interface to trigger an abnormal alarm.

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