EPS-UPS security power supply control system

Abstract

The invention discloses an EPS-UPS security power supply control system, and belongs to the technical field of security power supplies, the EPS-UPS security power supply control system comprises an EPS module, a UPS module, a power supply module, a power supply switching module and an equipment module, the power supply module comprises a first power supply module and a second power supply module which are connected in parallel, the first power supply module and the second power supply module are electrically connected with the EPS module, and the power supply switching module is electrically connected with the equipment module. The EPS module is electrically connected with the equipment module, the EPS module is connected to a circuit of the UPS module in parallel and is electrically connected with the first power supply module and the second power supply module, and when the output voltage of the power supply modules is unstable or power failure occurs, the EPS module and the UPS module serve as emergency power supplies to supply power to a load main loop and a control loop respectively. And no power loss of the equipment module power supply is ensured. According to the invention, an uninterrupted emergency power supply can be provided for important equipment under the condition of power loss of the whole plant, continuous power supply of the important equipment under the condition of power loss is ensured, and safe operation of the important equipment of an enterprise is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of security power supply, in particular to an EPS-UPS security power supply control system. BACKGROUND

[0002] In the chemical industry, in addition to the normal requirement of double power supply for some important equipment, emergency power supply is also needed when the whole plant is powered off to ensure the safe shutdown of the system. If the methanol feed pump of the propylene oxide device is interrupted, a large amount of flammable and explosive materials in the reactor cannot be withdrawn in time, which will not only cause the continuous production process to be forced to stop, but also sometimes cause fire, explosion and other serious accidents; therefore, uninterrupted power supply for important equipment plays a very important role in the safe operation of enterprises in the case of power failure. SUMMARY

[0003] The main purpose of the present application is to solve the above-mentioned technical problems to some extent, and an EPS-UPS security power supply control system is proposed, which can provide uninterrupted emergency power supply for important equipment in the case of power failure of the whole plant, and ensure the continuous power supply of important equipment in the case of power failure, and ensure the safe operation of important equipment of enterprises.

[0004] The above-mentioned problems solved by the present application are realized by the following technical scheme: an EPS-UPS security power supply control system is proposed, which comprises an EPS module, a UPS module, a power module, a power switching module and a device module, the power module comprises a first power module and a second power module connected in parallel, the first power module and the second power module are respectively electrically connected with the EPS module, the EPS module is electrically connected with the device module, the EPS module is connected in parallel on the circuit of the UPS module and is electrically connected with the first power module and the second power module, when the output voltage of the power module is unstable or power failure occurs, the EPS module and the UPS module serve as emergency power supply to supply power to the load main circuit and the control circuit respectively, and the power supply of the device module is ensured not to be powered off.

[0005] In some embodiments, the EPS module comprises an alternating current input switch Q1, a switching unit, a total output switch Q3, a charger and an inverter, the alternating current input switch Q1, the switching unit and the total output switch Q3 are connected in series, wherein the alternating current input switch Q1 is electrically connected with the power switching module, the total output switch Q3 is electrically connected with the device module, the charger is connected in parallel on the circuit between the alternating current input switch Q1 and the switching unit, and the charger is connected in parallel with the inverter.

[0006] In some embodiments, the charger is connected in series with a charger switch Q5 and a first battery pack on the circuit of the charger, and an isolation transformer T1 and a system controller are connected in series on the circuit of the inverter, the system controller is electrically connected with a battery detection unit, an LED indicator, a display screen and a 485 communication unit, and the battery detection unit is electrically connected with the first battery pack.

[0007] In some embodiments, a manual bypass switch Q2 is connected in parallel between the power switching module and the total output switch Q3, an inverter switch Q4 is electrically connected on the circuit of the manual bypass switch Q2, and the inverter switch Q4 is electrically connected with the switching unit.

[0008] In some embodiments, the switching unit comprises a power supply contactor KM4 and an emergency contactor KM5 connected in parallel.

[0009] In some embodiments, a fuse FU1 and an electrical protection contactor KM3 are arranged on the circuit in which the charger and the inverter are connected in parallel.

[0010] In some embodiments, a micro-break switch Q6 and a surge protector are electrically connected on the circuit of the power switching module.

[0011] In some embodiments, the UPS module comprises a UPS power supply unit and an external bypass power supply unit, the UPS power supply unit is electrically connected with a second battery pack arranged, the input end of the UPS power supply unit is electrically connected with the power switching module, the external bypass power supply unit is connected in parallel on the circuit of the UPS power supply unit, and the output end of the UPS power supply unit is provided with an output contactor KM1 and is electrically connected with an external motor control power supply.

[0012] In some embodiments, the external bypass power supply unit comprises an external bypass switch QF2 and an external bypass contactor KM2 connected in series, a power supply switch QF and an input switch QF1 are arranged on the circuit of the input end of the UPS power supply unit, the external bypass switch QF2 is connected in parallel on the circuit between the power supply switch QF and the input switch QF1, and the external bypass contactor KM2 is electrically connected with the output contactor KM1.

[0013] In some embodiments, the device module comprises a methanol feeding pump and / or an auxiliary oil pump.

[0014] The above technical solutions provided by the present application have the following advantages compared with the prior art: The application adopts EPS module and UPS module to form a security power control system, wherein a power type emergency power supply EPS and UPS are combined, the normal power supply mode of the motor is two 380V power sources, if the first power source loses power, the dual power supply switching device automatically switches to the second power source to work, if both of the two 380V power sources lose power, the EPS module provides power emergency power supply for the motor, and the UPS provides control power for the motor, so as to ensure uninterrupted power supply of the equipment module, and the emergency time is at least 30 minutes, the capacity of the first battery pack and the second battery pack can be increased according to the emergency needs of production, so as to ensure longer emergency time.

[0015] The application has the characteristics of large capacity, simple structure, safety and reliability, high intelligent degree, low cost, convenient maintenance, wide application range, strong load adaptability and the like, and is suitable for various equipment such as elevators, smoke exhaust fans, water pumps and the like, and is especially suitable for occasions where important motors need continuous power supply. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without any creative effort.

[0017] Fig. 1 It is a control principle diagram of the EPS-UPS security power control system of the application; Fig. 2 It is a control principle diagram of the EPS module of the application; Fig. 3 It is a control principle diagram of the UPS module of the application.

[0018] Explanation of the reference signs: 1-EPS module; 2-UPS module; 3-power module; 4-power switching module; 5-equipment module; 6-switching unit; 7-charger; 8-inverter; 9-first battery pack; 10-system controller; 11-battery detection unit; 12-LED indicator light; 13-display screen; 14-485 communication unit; 15-surge protector; 16-external bypass power supply unit; 17-second battery pack. DETAILED DESCRIPTION

[0019] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of the present application.

[0020] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0021] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel solutions are included, for example, “A and / or B” includes A solution, or B solution, or A and B solutions are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0022] As shown in FIG. 1, Figs. 1-3 As shown in FIG. 1, the present application proposes an EPS-UPS security power supply control system, which includes an EPS module 1, a UPS module 2, a power module 3, a power switching module 4 and a device module 5. The power module 3 includes a first power module 3 and a second power module 3 connected in parallel. The first power module 3 and the second power module 3 are respectively electrically connected with the EPS module 1. The EPS module 1 is electrically connected with the device module 5. The EPS module 1 is connected in parallel on the circuit of the UPS module 2 and is electrically connected with the first power module 3 and the second power module 3. When the output voltage of the power module 3 is unstable or power failure occurs, the EPS module 1 and the UPS module 2 serve as emergency power supply to supply power to the load main circuit and the control circuit respectively, thereby ensuring that the power supply of the device module 5 does not lose power.

[0023] Referring to FIG. 2, Fig. 2As shown in the present application, the EPS module 1 includes an AC input switch Q1, a switching unit 6, a total output switch Q3, a charger 7 and an inverter 8, the AC input switch Q1, the switching unit 6 and the total output switch Q3 are connected in series, wherein the AC input switch Q1 is electrically connected with the power switching module 4, the total output switch Q3 is electrically connected with the device module 5, the charger 7 is connected in parallel on the circuit between the AC input switch Q1 and the switching unit 6, and is connected in parallel with the inverter 8, the switching unit 6 includes a power contactor KM4 and an emergency contactor KM5 connected in parallel; the circuit of the charger 7 is connected in series with a charger switch Q5 and a first battery group 9, the circuit of the inverter 8 is connected in series with an isolation transformer T1 and a system controller 10, the system controller 10 is electrically connected with a battery detection unit 11, an LED indicator 12, a display screen 13 and a 485 communication unit 14, the battery detection unit 11 is electrically connected with the first battery group 9; a manual bypass switch Q2 is connected in parallel between the power switching module 4 and the total output switch Q3, the circuit of the manual bypass switch Q2 is electrically connected with an inverter switch Q4, the inverter switch Q4 is electrically connected with the switching unit 6; a fuse FU1 and an electrical protection contactor KM3 are arranged on the circuit in which the charger 7 and the inverter 8 are connected in parallel.

[0024] Further, the circuit of the power switching module 4 is electrically connected with a micro-break switch Q6 and a surge protector 15, in order to improve the reliability of power supply, the present scheme further increases a manual bypass power supply, when the power supply of the EPS module 1 fails, the manual bypass power supply can be switched to, at this time, the AC input switch Q1, the inverter switch Q4 are manually opened, and the manual bypass switch Q2 is closed.

[0025] In the embodiment, when the first power module 3 (main power) and the second power module 3 (auxiliary power) both supply power, the device is powered by the first power module 3 (main power); When the first power module 3 (main power) is powered off and the second power module 3 (auxiliary power) is powered on, the device is powered by the second power module 3 (auxiliary power), and when the first power module 3 (main power) recovers power supply, the device automatically switches to power supply by the first power module 3 (main power); When the first power module 3 (main power) and the second power module 3 (auxiliary power) are both powered off, the device automatically switches to power supply by the inverter 8 (the UPS module 2 also switches to internal inverter power supply), and when the power module 3 (mains) recovers, the device automatically switches to power supply by the power module 3 (mains).

[0026] Specifically, the working principle of the EPS module 1 is as follows: When the power module 3 (mains) is normal, the power module 3 (mains) supplies power to the equipment module 5 including the methanol feed pump and / or auxiliary oil pump through the AC input switch Q1, the power contactor KM4 and the total output switch Q3, and then the power module 3 (mains) is detected and the battery charger 7 is managed, and then the first battery group 9 provides DC power to the inverter 8 through the fuse FU1 and the power contactor KM3; at the same time, under the control of the system controller 10 of the EPS module 1, the inverter 8 stops working and is in an automatic shutdown state; under this condition, the power actually used by the equipment module 5 is the power module 3 (mains) from the power grid, and the emergency power of the EPS module 1 is always working in a sleep state, which can effectively achieve the effect of energy saving.

[0027] When the power module 3 (mains) is interrupted or the voltage is out of limit (±15% or ±20% of the rated input voltage), the switching unit 6 will immediately switch to the inverter 8 for power supply, the power contactor KM4 is automatically disconnected, and the emergency contactor KM5 is automatically attracted. Under the support of the DC power provided by the first battery group 9, at this time, the power used by the equipment module 5 is the AC power converted by the first battery group 9 of the EPS module 1 through the inverter 8.

[0028] When the voltage of the power module 3 (mains) returns to normal, the system controller 10 of the EPS module 1 sends a signal to execute the automatic shutdown operation of the inverter 8, and also executes the switching operation from the inverter 8 power supply to the AC bypass power supply through its switching unit 6, the emergency contactor KM5 is automatically disconnected, and the power contactor KM4 is automatically attracted; thereafter, the EPS module 1 provides the power module 3 (mains) to the equipment module 5 through the AC bypass power supply path, and also charges the first battery group 9 through the charger 7.

[0029] Further, before operation, the EPS module 1 is functionally tested, and the steps are as follows: First, disconnect the AC input switch Q1 of the EPS module 1, confirm that the emergency contactor KM5 is attracted, the power contactor KM4 is disconnected, and whether the equipment inverter is working normally is confirmed, and whether the system state in the display screen 13 under the inverter state is normal is checked; then close the AC input switch Q1, the emergency contactor KM5 is automatically disconnected, the power contactor KM4 is automatically attracted, and it is confirmed that the EPS module 1 switches back to the power module 3 (mains) to continue power supply.

[0030] Reference Fig. 3As shown in the present application, the UPS module 2 includes a UPS power unit and an external bypass power supply unit 16, the UPS power unit is electrically connected with the second battery group 17, the input end of the UPS power unit is electrically connected with the power switching module 4, the external bypass power supply unit 16 is connected in parallel with the circuit of the UPS power unit, the output end of the UPS power unit is provided with an output contactor KM1 and is electrically connected with an external motor control power supply; the external bypass power supply unit 16 includes an external bypass switch QF2 and an external bypass contactor KM2 connected in series, the circuit of the input end of the UPS power unit is provided with a power switch QF and an input switch QF1, the external bypass switch QF2 is connected in parallel with the circuit between the power switch QF and the input switch QF1, and the external bypass contactor KM2 is electrically connected with the output contactor KM1.

[0031] When the power module 3 (mains) is normal, the AC 220V input from the power module 3 (mains) is input to the UPS module 2 in two ways, one way is directly through the UPS module 2 after rectification and inversion, and the other way is to charge the second battery group 17 after rectification, when the power module 3 (mains) is unstable or power failure, the second battery group 17 acts as an emergency power supply, and the load is supplied with power through the internal inverter of the UPS module 2, so as to ensure that the motor control power supply does not lose power; at the same time, the power supply reliability is improved through the external bypass power supply unit 16, wherein when the power supply of the UPS module 2 fails, the external bypass power supply unit 16 can be automatically switched to, at this time, the output contactor KM1 is disconnected, and the external bypass contactor KM2 is attracted to continue to supply power.

[0032] The EPS module 1 and the UPS module 2 are adopted to form the security power control system, which has large capacity, simple structure, safety and reliability, high intelligence, low cost and convenient maintenance; the EPS module 1 provides emergency power for the motor, the UPS provides control power for the motor, ensures uninterrupted power supply of the equipment module 5, and the emergency time is at least 30 minutes, the capacity of the first battery group 9 and the second battery group 17 can be increased according to the emergency needs of production, so as to ensure longer emergency time, and the security power control system is suitable for various equipment such as elevators, smoke exhaust fans and water pumps, and is especially suitable for occasions where important motors need continuous power supply.

[0033] Further, when in use, the EPS-UPS security power control system needs to be started and checked, and the steps are as follows: 1. Confirm that all switches are in the off position; 2. Start the UPS module 2 with the battery inverter, check whether the output voltage of the UPS module 2 is normal after the output contactor KM1 is attracted; 3. Close the charger 7 DC output switch of the EPS module 1, and detect that the DC bus DC voltage is normal; 4. Close the inverter switch Q4 of the EPS module 1, and close the control panel 0 / 1 switch of the switching unit 6; 5. Check the automatic attraction of the electric protection contactor KM3 and the emergency contactor KM5 of the EPS module 1, and the output of the inverter 8, and detect the normal output voltage of the inverter; 6. Close the AC input switch Q1 of the EPS module 1, and automatically open the emergency contactor KM5, and automatically attract the power contactor KM4, and detect the normal output voltage; 7. Close the charger switch Q5 of the EPS module 1, and close the AC input switch of the charger 7, and check whether the charger 7 is normal; 8. Close the power switch QF, the input switch QF1 and the external bypass switch QF2 of the power supply part of the UPS module 2, and check whether the working state of the UPS module 2 is correct; 9. Close the total output switch Q3 of the EPS module 1, and detect the normal output and load working; 10. Complete the start-up.

[0034] In summary, when the first power supply module 3 and the second power supply module 3 of the power supply module 3 are normally working, the EPS module 1 is powered by the first power supply module 3 (main power), the power supply module 3 (mains) provides power supply for the main circuit of the methanol feed pump or auxiliary oil pump motor through the AC input switch Q1, the power contactor KM4 and the total output switch Q3, and at the same time, the power supply module 3 (mains) performs power supply module 3 (mains) detection and battery charging management through the charger switch Q5 and the charger 7, and provides DC power for the inverter 8 through the fuse FU1 and the electric protection contactor KM3.

[0035] When the power supply of the power supply module 3 (mains) is interrupted or the mains voltage is out of limit (±15% or ±20% of the rated input voltage), the switching unit 6 will immediately switch to the inverter 8 for power supply, the power contactor KM4 is automatically opened, and the emergency contactor KM5 is automatically attracted, and under the support of the DC power provided by the first battery group 9, the AC power converted by the first battery group 9 of the EPS module 1 through the inverter 8 provides power supply for the main circuit of the methanol feed pump or auxiliary oil pump motor.

[0036] When the UPS module 2 is powered by the first power supply module 3 (main power), the power supply module 3 (mains) AC 220V is directly supplied to the control circuit of the methanol feed pump or auxiliary oil pump motor through the power switch QF, the input switch QF1 and the output contactor KM1 of the UPS module 2 after rectification and inversion inside the UPS module 2, and at the same time, the power supply module 3 (mains) charges the second battery group 17 after rectification inside the UPS module 2.

[0037] When the power supply module 3 (mains) power quality is unstable or power failure, the second battery 17 acts as an emergency power supply, through the UPS module 2 internal inverter to the load, at the same time the motor main contactor coil will not release, ensure that the methanol feed pump or auxiliary oil pump motor control loop power supply is not lost, ensure the continuous power supply of important equipment in the case of power failure.

[0038] The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, using the contents of the present application specification and drawings, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. An EPS-UPS security power supply control system, characterized in that, The system includes an EPS module, a UPS module, a power supply module, a power switching module, and an equipment module. The power supply module includes a first power supply module and a second power supply module connected in parallel. The first and second power supply modules are electrically connected to the EPS module, and the EPS module is electrically connected to the equipment module. The EPS module is connected in parallel to the circuit of the UPS module and is also electrically connected to the first and second power supply modules. When the output voltage of the power supply module is unstable or there is a power outage, the EPS module and the UPS module act as emergency power sources to ensure that the equipment module does not lose power.

2. The EPS-UPS security power control system according to claim 1, characterized in that, The EPS module includes an AC input switch Q1, a switching unit, a main output switch Q3, a charger, and an inverter. The AC input switch Q1, the switching unit, and the main output switch Q3 are connected in series. The AC input switch Q1 is electrically connected to the power switching module, and the main output switch Q3 is electrically connected to the device module. The charger is connected in parallel in the circuit between the AC input switch Q1 and the switching unit, and is also connected in parallel with the inverter.

3. The EPS-UPS security power control system according to claim 2, characterized in that, The charger circuit has a charger switch Q5 and a first battery pack connected in series. The inverter circuit has an isolation transformer T1 and a system controller connected in series. The system controller is electrically connected to a battery detection unit, an LED indicator, a display screen, and a 485 communication unit. The battery detection unit is electrically connected to the first battery pack.

4. The EPS-UPS security power control system according to claim 3, characterized in that, A manual bypass switch Q2 is connected in parallel between the power switching module and the main output switch Q3. An inverter switch Q4 is electrically connected to the circuit of the manual bypass switch Q2, and the inverter switch Q4 is electrically connected to the switching unit.

5. The EPS-UPS security power control system according to claim 2, characterized in that, The switching unit includes a power contactor KM4 and an emergency contactor KM5 connected in parallel.

6. The EPS-UPS security power control system according to claim 2, characterized in that, The circuit in which the charger and the inverter are connected in parallel is equipped with a fuse FU1 and an electrical protection contactor KM3.

7. The EPS-UPS security power control system according to claim 1, characterized in that, The power switching module is electrically connected to a miniature circuit breaker Q6 and a surge protector.

8. The EPS-UPS security power control system according to claim 1, characterized in that, The UPS module includes a UPS power supply unit and an external bypass power supply unit. The UPS power supply unit is electrically connected to the second battery pack. The input terminal of the UPS power supply unit is electrically connected to the power switching module. The external bypass power supply unit is connected in parallel to the circuit of the UPS power supply unit. The output terminal of the UPS power supply unit is equipped with an output contactor KM1 and is electrically connected to an external motor control power supply.

9. The EPS-UPS security power control system according to claim 8, characterized in that, The external bypass power supply unit includes an external bypass switch QF2 and an external bypass contactor KM2 connected in series. The circuit at the input end of the UPS power supply unit is provided with a power switch QF and an input switch QF1. The external bypass switch QF2 is connected in parallel in the circuit between the power switch QF and the input switch QF1. The external bypass contactor KM2 is electrically connected to the output contactor KM1.

10. The EPS-UPS security power control system according to claim 1, characterized in that, The equipment module includes a methanol feed pump and / or an auxiliary oil pump.

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