An actively detected power state detection system and method

Abstract

The application relates to an actively detected power state detection system and method, which comprises at least two groups of symmetrically arranged triode modules, an optical coupling isolation module and a MOS tube driving module; the MOS tube driving module is connected with a signal input end through double channels and is used for receiving active monitoring electric signals; when the double channels of each MOS tube driving module simultaneously receive the same active monitoring electric signals, the MOS tube driving module converts the active monitoring electric signals into detection pulses and sends the detection pulses to the optical coupling isolation module to conduct short-time detection on the power state; the optical coupling isolation module is used for isolating the MOS tube driving module from the measured power supply and transmitting the detection pulses from the MOS tube driving module; only one group of optical coupling isolation modules can be turned on at the same time in the system; the triode module is connected with a signal output end through double channels and is used for acquiring and outputting the power state to be measured. Compared with the prior art, the application can actively control the power state detection and conduct self-detection.

Description

Technical Field

[0001] This invention relates to the field of power condition monitoring, and in particular to an active power condition monitoring system and method. Background Technology

[0002] In fields such as industrial control, precision electronic equipment, and marine engineering, the stable operation of the power supply system is a core prerequisite for ensuring the normal operation of equipment. The real-time performance, accuracy, and safety of its status monitoring are directly related to the reliability of the entire system.

[0003] Traditional power supply detection solutions are divided into voltage detection and current detection. Current detection is generally achieved by using a current-sensing resistor or a sensing device to convert the current into voltage. Voltage detection methods include contact-based methods, which directly detect the voltage or convert the current into voltage using a sensing resistor; and non-contact methods, which use Hall effect sensors to sense voltage or current, or dedicated isolated current detection chips. For example, Chinese patent CN205679749U discloses a power-on / off detection circuit that uses signal sampling for detection.

[0004] The disadvantage of the above detection methods is insufficient safety. They are passive detection methods, meaning that abnormality detection is only performed after a power supply abnormality occurs. Passive detection relies on changes in the power supply's own output signal and can only detect abnormalities after they have occurred, such as voltage drops or overcurrent. It cannot proactively detect potential faults, such as early hidden dangers like aging of internal components or poor contact. This can easily lead to insufficient fault warning capabilities and cause sudden equipment shutdowns.

[0005] Meanwhile, in existing power supply detection systems, if the monitoring system itself malfunctions, it cannot perform self-judgment and self-correction, which may lead to misjudgment of power supply status and affect work efficiency.

[0006] To address the aforementioned issues, there is an urgent need for a power supply status monitoring system with active detection and self-detection capabilities, in order to achieve real-time and accurate monitoring of the power supply status. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art by providing an active power status detection system and method that can actively control power status detection and perform self-detection.

[0008] The objective of this invention can be achieved through the following technical solutions: An active power status detection system includes a signal input terminal and a signal output terminal. The system further includes at least two sets of symmetrically arranged transistor modules, optocoupler isolation modules, and MOSFET driver modules. The MOS transistor driving module is connected to the signal input terminal through dual channels to receive active monitoring electrical signals. When the dual channels of each MOS transistor driving module receive the same active monitoring electrical signal at the same time, the MOS transistor driving module converts the active monitoring electrical signal into a detection pulse and sends it to the optocoupler isolation module for short-term detection of the power supply status. The optocoupler isolation module is connected to the MOS transistor driver module on one side and to the power supply under test on the other side. It is used to isolate the MOS transistor driver module from the power supply under test and transmits the detection pulse from the MOS transistor driver module through electro-optical-electrical conversion. Only one set of optocoupler isolation modules can be turned on at the same time in the system. The transistor module is connected to the signal output terminal through dual channels to acquire and output the power supply status under test.

[0009] Furthermore, the MOS transistor driving module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, and a resistor; wherein, the gate of the first MOS transistor and the gate of the second MOS transistor are respectively connected to the signal input terminal via the resistor, the source of the first MOS transistor and the drain of the second MOS transistor are connected, the source of the second MOS transistor is grounded, the gate of the third MOS transistor is connected to the drain of the first MOS transistor, the drain of the third MOS transistor is connected to the optocoupler isolation module and the detection signal source via the resistor, and the source of the third MOS transistor is grounded.

[0010] Furthermore, the first MOSFET, the second MOSFET, and the third MOSFET are N-channel MOSFETs.

[0011] Furthermore, when the dual channels of any group of MOS transistor drive modules simultaneously receive the same active monitoring electrical signal, the first and second MOS transistors in this MOS transistor drive module are turned on, while the third MOS transistor is not turned on. The detection signal source is connected to the MOS transistor drive module and sends a detection pulse to the MOS transistor drive module. At the same time, the third MOS transistor in the symmetrical other group of MOS transistor drive modules is turned on.

[0012] Furthermore, the feature is that the signal input terminal is controlled by an MCU.

[0013] Furthermore, the optocoupler isolation module includes at least one optocoupler. The light-emitting diode end of the optocoupler is connected in series with a resistor and then connected to the MOSFET driver module. The photosensitive end of the optocoupler is connected to the transistor module and the power supply under test through a resistor, thereby realizing the isolation between the MOSFET driver module and the power supply under test and signal transmission.

[0014] Furthermore, the optocoupler is an isolated high-speed optocoupler that supports high-speed detection.

[0015] Furthermore, the transistor module includes at least one transistor, which is a P-type transistor. The base of the transistor is connected to the power supply under test via a resistor, and the collector and emitter are grounded via a resistor and connected to the signal output terminal.

[0016] Furthermore, the system also includes a resistor voltage divider and current limiting module, which contains at least twenty resistors connected in series within the transistor module, optocoupler isolation module, and MOSFET driver module, achieving voltage division and current limiting through series and parallel connection of resistors.

[0017] A power state detection method based on the active detection power anomaly detection system described above, the method comprising: Connect the active power status detection system to the power supply under test; By inputting the same active monitoring electrical signal into the dual channels of any set of MOS transistor drive modules through the signal input terminal, the dual channel output level of the signal output terminal is collected. If a high level within the preset normal range is collected at the signal output terminal of the same group, the difference between the output levels of the two channels of the signal output terminal is less than the error threshold, and the time interval between the output levels of the two channels of the signal output terminal is less than the preset time threshold, then it is determined that the current power supply under test is normal. Otherwise, the same active monitoring electrical signal is input to the two channels of another symmetrically set MOS transistor drive module through the signal input terminal, and the output level of the two channels of this group of signal output terminals is collected. If a high level within the preset normal range is acquired at the corresponding signal output terminal, the difference between the output levels of the two channels at the signal output terminal is less than the error threshold, and the time interval between the output levels of the two channels at the signal output terminal is less than the preset time threshold, then it is determined that the current power supply status is normal, the detection system is abnormal, and an alarm for abnormal detection system is triggered; otherwise, it is determined that the current power supply status is abnormal, and an alarm for abnormal power supply status is triggered.

[0018] Furthermore, when an abnormality is detected in the detection system, the abnormal part of the detection system is stopped, and the normal part is used to continue monitoring the power status. When the power status becomes abnormal, the output of the power supply under test is cut off.

[0019] Compared with the prior art, the beneficial effects of the present invention include: 1. This invention breaks through the limitations of traditional passive detection that relies on the power supply's own signals. A MOS transistor-driven module receives active monitoring signals through dual channels. Only when both channels simultaneously receive the same signal is the signal converted into a detection pulse and sent to the power supply under test via an optocoupler isolation module. This enables short-term active probing of the power supply status, allowing for early detection of potential faults and preventing sudden shutdowns. The fault response time is advanced from after an anomaly occurs to the potential risk stage. The invention also features a redundant design with multiple detection components. The input and output terminals generate detection pulses only when the signals from both channels are consistent, avoiding false triggering caused by single-channel interference and improving detection accuracy and resistance to false triggering.

[0020] 2. This invention can detect its own anomalies. When the first group of modules detects an anomaly, the system automatically sends an active monitoring signal to the second group of symmetrical modules through the signal input terminal. If the second group detects normally, the detection system can be directly determined to be abnormal and an alarm will be triggered. At the same time, the abnormal part is disabled and the normal part is enabled to continue monitoring. If both groups are abnormal, the power supply is determined to be abnormal. This method avoids misjudgment caused by a single channel failure and ensures that the detection process is not interrupted, solving the pain point of traditional systems that have no self-correction capability for their own faults.

[0021] 3. This invention achieves electrical isolation between the detection circuit and the power supply under test through an optocoupler isolation module, cuts off the grounding loop and electromagnetic interference path, and stabilizes signal transmission by combining a resistor voltage divider and current limiting design, thereby reducing detection errors. It is especially suitable for industrial environments with strong interference.

[0022] 4. The present invention adopts a redundant architecture with dual-group symmetrical modules and dual-channel verification. A single point of failure, such as the failure of a single MOSFET or transistor, will not cause the system to fail, and the power status can still be detected using the circuit on the other side.

[0023] 5. When the system of the present invention detects abnormalities such as signal inconsistency or module failure, it can cut off the dangerous output through the linkage of MOS transistor and optocoupler to prevent the fault from spreading.

[0024] 6. This invention, through modular design and adjustable resistance parameters, can adapt to power supply detection requirements of different voltage levels and power ranges without the need to redesign the hardware architecture. Attached Figure Description

[0025] Figure 1 This is a system block diagram of the present invention; Figure 2 This is a specific circuit diagram of the system of the present invention; Figure 3 This is a flowchart of the method of the present invention. Detailed Implementation

[0026] 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, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] Example 1 This embodiment discloses an active power state detection system, the system block diagram of which is shown below. Figure 1 As shown, it includes two sets of symmetrically arranged signal input terminals, signal output terminals (signal acquisition output terminals, used for), a transistor module, an optocoupler isolation module, and a MOSFET driver module. The specific circuit of the power status monitoring system in this embodiment is as follows: Figure 2 As shown.

[0028] The MOSFET driver module is connected to the signal input terminals via dual channels to receive active monitoring electrical signals. In this embodiment, the left-side signal input terminals are IN1_MCU1 and IN1_MCU2, and the right-side terminals are IN2_MCU1 and IN2_MCU2.

[0029] When both channels of the MOSFET driver module receive the same active monitoring signal simultaneously, the MOSFET driver module converts the active monitoring signal into a detection pulse and sends it to the optocoupler isolation module for short-term power status detection.

[0030] Taking the MOSFET driver module on the left as an example, this MOSFET driver module includes a first MOSFET, a second MOSFET, a third MOSFET, and a resistor. The first MOSFET, the second MOSFET, and the third MOSFET are all N-channel MOSFETs, and the signal input terminal is controlled by an MCU.

[0031] The gates of the first MOSFET and the second MOSFET are connected to the signal input terminal via resistors. The source of the first MOSFET is connected to the drain of the second MOSFET, and the source of the second MOSFET is grounded. The gate of the third MOSFET is connected to the drain of the first MOSFET. The drain of the third MOSFET is connected to the optocoupler isolation module and the detection signal source via a resistor, and the source of the third MOSFET is grounded.

[0032] When both channels of any group of MOSFET driver modules simultaneously receive the same active monitoring signal, the first and second MOSFETs in this MOSFET driver module are turned on, while the third MOSFET is turned off. The detection signal source is connected to the MOSFET driver module, sending a detection pulse to the MOSFET driver module. At the same time, the third MOSFET of the other symmetrical group of MOSFET driver modules, which has not received the same active monitoring signal, is turned on, cutting off the detection signal source path of the corresponding MOSFET driver module. This ensures that only the current group of MOSFET driver modules is turned on at any given time, avoiding signal interference.

[0033] One side of the optocoupler isolation module is connected to the MOSFET driver module, and the other side is connected to the power supply under test. It is used to isolate the MOSFET driver module from the power supply under test, and transmits the detection pulse from the MOSFET driver module through electro-optical-electrical conversion. Only one set of optocoupler isolation modules can be turned on at the same time in the system.

[0034] The optocoupler isolation module includes at least one optocoupler, which is an isolated high-speed optocoupler that supports high-speed detection. In this embodiment, the optocoupler is HCPL_0501, which supports high-speed detection, and the two optocouplers are designed not to be turned on simultaneously.

[0035] The LED terminal inside the optocoupler is connected to the MOSFET driver module via a series resistor. The photosensitive terminal of the optocoupler is connected to the transistor module and the power supply under test via a resistor, thereby achieving isolation between the MOSFET driver module and the power supply under test, as well as signal transmission.

[0036] The transistor module is connected to the signal output terminals via dual channels to acquire and output the status of the power supply under test. In this embodiment, the signal output terminals on the left are FB1_MCU1 and FB1_MCU2, and those on the right are FB2_MCU1 and FB2_MCU2.

[0037] The transistor module includes at least one transistor. In this embodiment, the transistor is a PNP transistor. The base of the transistor is connected to the power supply under test through a resistor, the collector is grounded, and the collector is connected to the signal output terminal.

[0038] Figure 2 In the diagram, on the left, the first MOSFET is Q1, the second MOSFET is Q2, the third MOSFET is Q3, the optocoupler is U1, and the transistor is Q7, forming a transistor module, an optocoupler isolation module, and a MOSFET driver module. On the right, the first MOSFET is Q4, the second MOSFET is Q5, the third MOSFET is Q6, the optocoupler is U2, and the transistor is Q8, forming another transistor module, an optocoupler isolation module, and a MOSFET driver module. In the diagram, PVCC represents the power supply under test.

[0039] Taking one side as an example, when U1 starts detection, the primary windings U1.1 and U1.2 of U1 are turned on. At this time, the DS of Q3 needs to be off and the DS of Q5 needs to be turned on. When U2 starts detection, the primary windings U2.1 and U2.2 of U2 are turned on. At this time, the DS of Q5 needs to be off and the DS of Q3 needs to be turned on. This allows two redundant detection circuits to work simultaneously.

[0040] In another embodiment, the system further includes a resistor voltage divider and current limiting module, which contains at least twenty resistors connected in series within the transistor module, optocoupler isolation module, and MOSFET driver module, and achieves voltage division and current limiting through series and parallel connection of resistors.

[0041] In practical applications, since this system is an encapsulated system, the logical relationships between the system's inputs and outputs can be predetermined. After connecting to the power supply under test, the system inputs a detection signal, receives an output signal, and compares it with the preset input-output logical relationship table to quickly obtain the power supply detection result. In this embodiment, the system input-output logical relationships (power supply status normal) are set as shown in Table 1 below.

[0042] Table 1 Input-Output Logic Relationship Table The system can detect the output level of the corresponding side only when the same electrical signal is input to the same input terminal. During detection, if the same electrical signal is input to both sides at the same time, which is an abnormal detection action, the system can shield the abnormal detection action to avoid signal interference, making the detection more reliable and safe.

[0043] Example 2 This embodiment discloses a power state detection method for a power anomaly detection system based on active detection, based on Embodiment 2 above. The specific process of the method is as follows: Figure 3 As shown, it includes: Connect the active power status detection system to the power supply under test; By inputting the same active monitoring electrical signal into the dual channels of any set of MOS transistor drive modules through the signal input terminal, the dual channel output level of the signal output terminal is collected. If a high level within the preset normal range is collected at the signal output terminal of the same group, the difference between the output levels of the two channels of the signal output terminal is less than the error threshold, and the time interval between the output levels of the two channels of the signal output terminal is less than the preset time threshold, then it is determined that the current power supply under test is normal. Otherwise, the same active monitoring electrical signal is input to the two channels of another symmetrically set MOS transistor drive module through the signal input terminal, and the output level of the two channels of this group of signal output terminals is collected. If a high level within the preset normal range is acquired at the corresponding signal output terminal, the difference between the output levels of the two channels at the signal output terminal is less than the error threshold, and the time interval between the output levels of the two channels at the signal output terminal is less than the preset time threshold, then it is determined that the current power supply status is normal, the detection system is abnormal, and an alarm for abnormal detection system is triggered; otherwise, it is determined that the current power supply status is abnormal, and an alarm for abnormal power supply status is triggered.

[0044] When an abnormality is detected in the detection system, the abnormal part of the detection system is stopped, and the normal part is used to continue monitoring the power status. When the power status becomes abnormal, the output of the power supply under test is cut off.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An active power status detection system, comprising a signal input terminal and a signal output terminal, characterized in that, The system also includes: at least two sets of symmetrically arranged transistor modules, optocoupler isolation modules, and MOSFET driver modules; The MOS transistor driving module is connected to the signal input terminal through dual channels to receive active monitoring electrical signals. When the dual channels of each MOS transistor driving module receive the same active monitoring electrical signal at the same time, the MOS transistor driving module converts the active monitoring electrical signal into a detection pulse and sends it to the optocoupler isolation module for short-term detection of the power supply status. The optocoupler isolation module is connected to the MOS transistor driver module on one side and to the power supply under test on the other side. It is used to isolate the MOS transistor driver module from the power supply under test and transmits the detection pulse from the MOS transistor driver module through electro-optical-electrical conversion. Only one set of optocoupler isolation modules can be turned on at the same time in the system. The transistor module is connected to the signal output terminal through dual channels to acquire and output the power supply status under test; The MOS transistor driving module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, and a resistor; wherein, the gates of the first MOS transistor and the second MOS transistor are respectively connected to the signal input terminal via the resistor, the source of the first MOS transistor is connected to the drain of the second MOS transistor, the source of the second MOS transistor is grounded, the gate of the third MOS transistor is connected to the drain of the first MOS transistor, the drain of the third MOS transistor is connected to the optocoupler isolation module and the detection signal source via the resistor, and the source of the third MOS transistor is grounded; When both channels of any group of MOSFET driver modules simultaneously receive the same active monitoring signal, the first and second MOSFETs in this MOSFET driver module are turned on, while the third MOSFET is not turned on. The detection signal source is connected to the MOSFET driver module and sends a detection pulse to the MOSFET driver module. At the same time, the third MOSFET in the symmetrical other group of MOSFET driver modules is turned on.

2. The active power status detection system according to claim 1, characterized in that, The first MOSFET, the second MOSFET, and the third MOSFET are N-channel MOSFETs.

3. The active power status detection system according to claim 1, characterized in that, The signal input terminal is controlled by an MCU.

4. The active power status detection system according to claim 1, characterized in that, The optocoupler isolation module includes at least one optocoupler. The light-emitting diode end of the optocoupler is connected in series with a resistor and then connected to the MOSFET driver module. The photosensitive end of the optocoupler is connected to the transistor module and the power supply under test through a resistor, thereby realizing the isolation between the MOSFET driver module and the power supply under test and signal transmission.

5. The active power status detection system according to claim 4, characterized in that, The optocoupler is an isolated high-speed optocoupler that supports high-speed detection.

6. The active power status detection system according to claim 1, characterized in that, The transistor module includes at least one transistor, which is a P-type transistor. The base of the transistor is connected to the power supply under test via a resistor, and the collector and emitter are grounded via a resistor and connected to the signal output terminal.

7. The active power status detection system according to claim 1, characterized in that, The system also includes a resistor voltage divider and current limiting module, which contains at least twenty resistors connected in series within the transistor module, optocoupler isolation module, and MOSFET driver module. Voltage division and current limiting are achieved through the series and parallel connection of resistors.

8. A power state detection method based on the active detection power state detection system according to any one of claims 1-7, characterized in that, The method includes: Connect the active power status detection system to the power supply under test; By inputting the same active monitoring electrical signal into the dual channels of any set of MOS transistor drive modules through the signal input terminal, the dual channel output level of the signal output terminal is collected. If a high level within the preset normal range is collected at the signal output terminal of the same group, the difference between the output levels of the two channels of the signal output terminal is less than the error threshold, and the time interval between the output levels of the two channels of the signal output terminal is less than the preset time threshold, then it is determined that the current power supply under test is normal. Otherwise, the same active monitoring electrical signal is input to the two channels of another symmetrically set MOS transistor drive module through the signal input terminal, and the output level of the two channels of this group of signal output terminals is collected. If a high level within the preset normal range is acquired at the corresponding signal output terminal, the difference between the output levels of the two channels at the signal output terminal is less than the error threshold, and the time interval between the output levels of the two channels at the signal output terminal is less than the preset time threshold, then it is determined that the current power supply status is normal, the detection system is abnormal, and an alarm for abnormal detection system is triggered; otherwise, it is determined that the current power supply status is abnormal, and an alarm for abnormal power supply status is triggered.

9. The power supply status detection method according to claim 8, characterized in that, When an abnormality is detected in the detection system, the abnormal part of the detection system is stopped, and the normal part is used to continue monitoring the power status. When the power status becomes abnormal, the output of the power supply under test is cut off.

Images