Fault diagnosis and active isolation technology applied to PLC redundant power supply

Abstract

The invention discloses a fault diagnosis and active isolation technology applied to a PLC redundant power supply, and relates to the technical field of fault diagnose.The fault diagnosis and active isolation technology comprises a power supply connecting module, a power supply loop control module, a switch control module, a redundant power supply control module and a communication processing module. When one power supply fails, normal work of the system is not influenced, the maintenance flexibility of the PLC system is improved, online maintenance can be realized, the maintenance time and cost are reduced, the load is balanced, the use efficiency of the power supply can be optimized, and the service life of the power supply is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of fault diagnosis, and in particular to a fault diagnosis and active isolation technology applied to a PLC redundant power supply. Background Art

[0002] Redundant power supply means that multiple power supplies (N+1 mode) supply power to the same or multiple devices at the same time. When one of the power supplies fails, the other power supplies will not be affected and the normal operation of the equipment will not be interrupted. It can also transmit the information of the diagnosed faulty power supply for easy maintenance and replacement. The redundant switching solutions currently used in the PLC industry mainly use foreign (TI) N+1 and ORing controller chips. The invention uses a combination of electronic components such as transistors, current detection chips, and operational amplifiers to realize the redundant function of the power supply on the PLC, and realize intelligent diagnosis of the power supply of the entire system and active isolation in case of abnormalities. Summary of the invention

[0003] The purpose of the present invention is to provide a fault diagnosis and active isolation technology applied to a PLC redundant power supply, which solves the problems existing in the background technology.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a fault diagnosis and active isolation technology applied to a PLC redundant power supply, including: a power connection module for connecting the PLC system power supply to the backplane connector.

[0005] The power supply circuit control module is used to control the power supply circuit.

[0006] The switch control module is used for switching control of power supply.

[0007] Redundant power supply control module, used for redundant power supply analysis.

[0008] The communication processing module is used for power supply alarm.

[0009] Preferably, the PLC system power supply is connected to the backplane connector by: the PLC system power supply input first passes through the EMC protection circuit, and then is output to the PLC system backplane connector through the MOS tube control.

[0010] Preferably, the power supply circuit is controlled by: -24V output is controlled by +24V, and the power supply circuit is: +24V->R2->R1->NMOS source->NMOS body diode->NMOS drain->-24V, at which time the voltage at the gate of the NMOS tube is +12V, and the NMOS tube is in the on state.

[0011] R1 and R2 have the same resistance value and are used to divide the voltage for the gate of NMOS. The resistance value of R1 / R2 can be adjusted according to the input voltage to provide the appropriate Vgs for the NMOS tube.

[0012] Preferably, the switch control for power supply is specifically performed as follows: the +24V output is controlled by an external toggle switch, and when the control switch is turned to GND, the PMOS is turned on and the power supply is output normally.

[0013] When the toggle switch is left floating, the PMOS is turned off and the power supply has no output.

[0014] Preferably, the redundant power supply analysis is performed in the following specific method: when serving as a redundant power supply, the power supply is output to a current detection circuit at the backplane interface through a PMOS.

[0015] When the power supply is output normally, the current flows from the power module to the PLC system backplane connector, and the current value collected by the ADC of the MCU is displayed as positive.

[0016] When the power module has no output, the redundant power supply in parallel on the PLC system outputs power to the faulty module MCU system, the current collected by the ADC of the MCU is displayed as a negative value, and the abnormal indicator light on the faulty power light board is on.

[0017] Preferably, the power supply alarm is performed in the following specific method: the power supply module on the PLC system communicates with the CPU board through 485 on the system, and the MCU of the power supply module can transmit the collected current and voltage information to the CPU module on the system in real time, and the CPU module issues an alarm in time to prompt the maintenance of the faulty power supply module.

[0018] The beneficial effects of the present invention are: (1) The power supply redundancy of the PLC system can improve the system reliability and enhance the fault tolerance capability, and a power supply failure will not affect the normal operation of the system.

[0019] (2) Increase the flexibility of PLC system maintenance, realize online maintenance, and reduce maintenance time and cost.

[0020] (3) Load balancing can optimize power efficiency and extend the service life of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1It is a schematic diagram of the technical module of the present invention.

[0023] Figure 2 It is a schematic diagram of the working principle block diagram of the redundant power supply of the present invention.

[0024] Figure 3 It is a schematic diagram of the backplane bus of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Reference Figure 1 As shown, the present invention provides a fault diagnosis and active isolation technology applied to a PLC redundant power supply, including: a power connection module, a power supply loop control module, a switch control module, a redundant power supply control module and a communication processing module.

[0027] It should be noted that the power connection module is connected to the power supply circuit control module, the power supply circuit control module is connected to the switch control module, the switch control module is connected to the redundant power supply control module, and the redundant power supply control module is connected to the communication processing module.

[0028] The power connection module is used to connect the PLC system power supply to the backplane connector.

[0029] The power supply circuit control module is used to control the power supply circuit.

[0030] The switch control module is used to perform switch control of power supply.

[0031] The redundant power supply control module is used for performing redundant power supply analysis.

[0032] The communication processing module is used for power supply alarm.

[0033] In a specific implementation of the present invention, the PLC system power supply is connected to the backplane connector by: the PLC system power supply input first passes through the EMC protection circuit, and then is output to the PLC system backplane connector through the MOS tube control.

[0034] In the specific implementation of the present invention, the specific method for controlling the power supply circuit is: -24V output is controlled by +24V, and the power supply circuit is: +24V->R2->R1->NMOS source->NMOS body diode->NMOS drain->-24V, at this time, the voltage at the gate of the NMOS tube is +12V, and the NMOS tube is in the on state.

[0035] R1 and R2 have the same resistance value and are used to divide the voltage for the gate of NMOS. The resistance value of R1 / R2 can be adjusted according to the input voltage to provide the appropriate Vgs for the NMOS tube.

[0036] In a specific implementation of the present invention, the switch control for power supply is specifically performed as follows: +24V output is controlled by an external toggle switch, and when the control switch is turned to GND, the PMOS is turned on and the power supply is output normally.

[0037] When the toggle switch is left floating, the PMOS is turned off and the power supply has no output.

[0038] In a specific implementation of the present invention, the redundant power supply analysis is performed in the following specific method: when serving as a redundant power supply, the power supply is output to a current detection circuit at a backplane interface through a PMOS.

[0039] When the power supply is output normally, the current flows from the power module to the PLC system backplane connector, and the current value collected by the ADC of the MCU is displayed as positive.

[0040] When the power module has no output, the redundant power supply in parallel on the PLC system outputs power to the faulty module MCU system, the current collected by the ADC of the MCU is displayed as a negative value, and the abnormal indicator light on the faulty power light board is on.

[0041] In the specific implementation of the present invention, the power supply alarm is performed as follows: the power supply module on the PLC system communicates with the CPU board through the 485 on the system, and the MCU of the power supply module can transmit the collected current and voltage information to the CPU module on the system in real time. The CPU module issues an alarm in time to prompt the maintenance of the faulty power supply module.

[0042] Reference Figure 2 FIG. 1 is a block diagram showing the principle of the redundant power supply of the present invention when it is working.

[0043] Reference Figure 3 FIG. 1 is a schematic diagram showing the relationship between power modules in the backplane bus of the present invention.

[0044] PLC system power redundancy can improve system reliability and enhance fault tolerance. A power failure will not affect the normal operation of the system.

[0045] Increasing the flexibility of PLC system maintenance can realize online maintenance, reducing maintenance time and cost.

[0046] Load balancing can optimize power efficiency and extend the service life of the power supply.

[0047] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A fault diagnosis and active isolation technology applied to a PLC redundant power supply, characterized in that: include: A power connection module, used to connect the PLC system power supply to the backplane connector; A power supply circuit control module, used for controlling the power supply circuit; A switch control module, used for switching control of power supply; Redundant power supply control module, used for redundant power supply analysis; The communication processing module is used for power supply alarm.

2. The fault diagnosis and active isolation technology applied to a PLC redundant power supply according to claim 1 is characterized in that: The specific method of connecting the PLC system power supply to the backplane connector is as follows: The PLC system power input first passes through the EMC protection circuit and then is controlled by the MOS tube to be output to the PLC system backplane connector.

3. The fault diagnosis and active isolation technology applied to a PLC redundant power supply according to claim 1 is characterized in that: The specific method of controlling the power supply circuit is as follows: The -24V output is controlled by +24V, and the power supply circuit is: +24V—>R2—>R1—>NMOS source—>NMOS body diode—>NMOS drain—>-24V. At this time, the voltage at the gate of the NMOS tube is +12V, and the NMOS tube is in the on state; R1 and R2 have the same resistance value and are used to divide the voltage for the gate of NMOS. The resistance value of R1 / R2 can be adjusted according to the input voltage to provide the appropriate Vgs for the NMOS tube.

4. The fault diagnosis and active isolation technology applied to a PLC redundant power supply according to claim 1 is characterized in that: The specific method of the switch control for power supply is as follows: +24V output is controlled by an external toggle switch. When the control switch is turned to GND, the PMOS is turned on and the power supply is output normally. When the toggle switch is left floating, the PMOS is turned off and the power supply has no output.

5. The fault diagnosis and active isolation technology applied to a PLC redundant power supply according to claim 1 is characterized in that: The specific method of performing redundant power supply analysis is as follows: When used as a redundant power supply, the power is output through the PMOS to the current detection circuit at the backplane interface; When the power supply is output normally, the current flows from the power module to the PLC system backplane connector, and the current value collected by the ADC of the MCU is displayed as positive; When the power module has no output, the redundant power supply in parallel on the PLC system outputs power to the faulty module MCU system, the current collected by the ADC of the MCU is displayed as a negative value, and the abnormal indicator light on the faulty power light board is on.

6. The fault diagnosis and active isolation technology applied to a PLC redundant power supply according to claim 1 is characterized in that: The specific method of performing the power supply alarm is as follows: The power module on the PLC system communicates with the CPU board through the 485 on the system. The MCU of the power module can transmit the collected current and voltage information to the CPU module on the system in real time. The CPU module will issue an alarm in time to prompt the maintenance of the faulty power module.

Images