CN114005703B - Anti-interference system of self-matching alternating-current contactor - Google Patents
Anti-interference system of self-matching alternating-current contactor Download PDFInfo
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- CN114005703B CN114005703B CN202111309979.7A CN202111309979A CN114005703B CN 114005703 B CN114005703 B CN 114005703B CN 202111309979 A CN202111309979 A CN 202111309979A CN 114005703 B CN114005703 B CN 114005703B
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- 239000003990 capacitor Substances 0.000 claims abstract description 52
- 238000002955 isolation Methods 0.000 claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 230000005669 field effect Effects 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract description 7
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- 238000004146 energy storage Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
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Abstract
The invention relates to an anti-interference system of a self-matching alternating current contactor, and belongs to the technical field of power electronics. The device comprises a central control unit, a voltage isolation conversion measurement unit, an alternating current-direct current power supply unit, a half-bridge alternating current-direct current conversion unit, a super capacitor charging and discharging unit, a voltage conversion unit, a PWM isolation output voltage unit, a contactor voltage isolation conversion unit, a first relay, a second relay, a storage unit and an input and output unit. The invention has reasonable structure, can automatically calculate the voltage to be output when the contactor is in interference electricity, has simple calculation, can reduce the requirement on a CPU and improves the efficiency.
Description
Technical Field
The invention relates to an anti-interference system of a self-matching alternating current contactor, and belongs to the technical field of power electronics.
Background
In the prior art, ac contactors are one of the important elements in automatic control systems, which are widely used for frequent operation and remote control in industrial sites. The working principle of the AC contactor is mainly to utilize a control loop to electrify, an electromagnetic coil generates electromagnetic attraction force and a main loop is closed. But once the voltage is in a dazzle state, the alternating current contactor is released, so that the operation of the equipment is affected. Therefore, to ensure reliable operation of the device, a system is required to provide the ac contactor with anti-glare capability.
The existing ac contactor anti-sloshing system generally has the following defects: 1. most anti-interference systems first acquire parameters of an ac contactor, typically a coil resistance of the contactor. The anti-interference system outputs fixed direct-current voltage when in interference electricity, and the direct-current voltage output when the interference electricity is generated is configured by a manufacturer according to the resistance value when the factory leaves the factory; the anti-interference system with variable output direct-current voltage is configured with parameters on site by a user, and then whether the alternating-current contactor can be reliably attracted or not is verified. Both the two modes are unfavorable for on-site debugging and use, and the workload is large and the efficiency is low; 2. the current transformer is adopted to obtain the working current of the alternating current contactor coil, so that the capacity of the coil is calculated, the coil current is small in the mode, the power factor is low when the alternating current type anti-interference system works in an alternating current mode, the non-resistive load of the contactor coil is calculated relatively complex, the precision is low, and when the alternating current type anti-interference system works in a half-bridge rectifying energy-saving mode, the current transformer is saturated through direct current, and the actual direct current is difficult to measure.
The Chinese patent with the patent publication number of CN211826985U discloses an intelligent multifunctional controller for preventing electricity interference, which comprises a main control energy storage capacitor, a microprocessor main control circuit, a driving circuit, a bidirectional thyristor module, a state output relay, a relay driving circuit, a relay energy storage capacitor, a power supply management and control circuit, a current sensor, a voltage sensor, a switching power supply and a capacitor state detection circuit, wherein the main control energy storage capacitor is used for providing electric energy for an external power supply of the controller when the external power supply of the controller is in power failure; the state output relay is used for outputting the working state of the intelligent controller; the setting of the state output relay is driven by a switching power supply; the current sensor and the voltage sensor are used for detecting the current and the voltage of the load respectively.
The above patent uses a bidirectional thyristor to realize the control of the main loop to open and close, but the self-detection function of the device can make the anti-electric-dazzling device work stably, which requires complex calculation and requires higher CPU.
Therefore, in order to solve the above-mentioned background problems, it is urgent to develop an anti-electric-interference system of a self-matching ac contactor.
Disclosure of Invention
The invention aims to solve the problems in the background problems, and provides an anti-interference system of a self-matching alternating current contactor, which has reasonable structure and simple calculation and can reduce the requirement on a CPU.
The purpose of the invention is realized in the following way: the anti-interference system of the self-matching alternating current contactor comprises a central control unit, a voltage isolation conversion measurement unit, an alternating current-to-direct current power supply unit, a half-bridge alternating current-to-direct current conversion unit, a super capacitor charging-discharging unit, a voltage conversion unit, a PWM isolation output voltage unit, a contactor voltage isolation conversion unit, a first relay, a second relay, a storage unit and an input-output unit;
The voltage isolation conversion measurement unit converts the commercial power signal and transmits the commercial power signal to the central control unit, and the central control unit collects and calculates the current commercial power state and is used for controlling the working mode of the first relay and the second relay;
the voltage isolation conversion measurement unit comprises a current limiting resistor, a voltage transformer, a sampling resistor and RC filtering, wherein an electric supply is connected to the input end of the voltage transformer through the current limiting resistor, the output end of the voltage transformer is connected with the sampling resistor in parallel, and the electric supply is transmitted to the central control unit for analog-digital conversion after RC filtering through the resistor and the capacitor;
The alternating current-to-direct current power supply unit is connected with a mains supply, the live wire is connected with the self-recovery fuse, then connected with the varistor in parallel, connected with the winding resistor in series, then connected with the input end of the AC/DC power supply module, and the output end of the AC/DC power supply module is connected with the filter capacitor and the TVS diode in parallel in sequence and then outputs direct current voltage;
The super capacitor charging and discharging unit charges a super capacitor group by using direct current voltage output by the alternating current-to-direct current power supply unit through a first diode and a current limiting resistor, wherein the super capacitor group is formed by connecting a single super capacitor and the resistor in parallel and then connecting the super capacitor group in series;
The voltage conversion unit converts the output voltage of the super capacitor charging and discharging unit, the output voltage is connected to the input end of the power module after being subjected to capacitor filtering, the output end of the power module is connected with the filter capacitor and the TVS diode in parallel, and the output voltage is connected to one end of the second control node of the first relay after being subjected to fuse;
The PWM isolation output voltage unit comprises a resistor, an optocoupler, a field effect transistor driving circuit and a field effect transistor, wherein a signal from a PWM control end of the central control unit is connected with an input end of the isolation optocoupler after being connected with the resistor, an output end of the isolation optocoupler is connected with the field effect transistor driving circuit, an output end of the field effect transistor driving circuit is connected with the field effect transistor, and an output end of the field effect transistor is connected with the other end of a second control node of the first relay;
The contactor voltage isolation conversion unit comprises an absorption capacitor, a voltage dividing resistor and an isolation operational amplifier, wherein the absorption capacitor, the voltage dividing resistor and the isolation operational amplifier are connected with two ends of an external alternating current contactor, the two ends of the alternating current contactor are connected with the absorption capacitor in parallel, then the absorption capacitor is connected with the input end of the isolation operational amplifier after voltage division through the resistor, the output end of the isolation operational amplifier is connected with the resistor in series respectively and then connected with the central control unit, and the central control unit is used for measuring alternating current and direct current voltage on an actual contactor coil through differential operation.
The storage unit comprises a storage chip, is externally connected with a pull-up resistor and is connected with the central control unit in a serial communication mode.
The input/output unit is connected with the central control unit and comprises a switching value input module and a switching value output module;
the switching value input module is accessed by a state point of external equipment, is connected to the input end of the optical coupler after being divided, and the output end of the optical coupler is connected to the central control unit;
The switching value output module consists of a relay and a driving circuit, wherein the central control unit is connected to the driving chip and then connected to the relay, and the relay output is connected to an external terminal for controlling external equipment.
The first relay and the second relay are both connected with the central control unit, and the first relay comprises a first control node and a second control node; the second relay comprises a third control node and a fourth control node; the output of the second relay is connected to one end of the first control node of the first relay, and the live wire is connected to the other end of the first control node of the first relay; when the first relay is positioned at a first control node and the second relay is positioned at a third control node, the commercial power is directly connected with the fuse for output after passing through the first control node and the third control node; when the first relay is positioned at a first control node and the second relay is positioned at a fourth control node, the commercial power is converted by the half-bridge AC-DC conversion unit and then passes through one end of the fourth control node and one end of the first control node, and the live wire is connected with the fuse for output through the other end of the first control node; when the first relay is positioned at the second control node, the first relay is output by the PWM isolation output voltage unit;
The half-bridge AC/DC conversion unit comprises a capacitor, a fuse, a rectifier diode and resistors, wherein the capacitor is connected with the mains supply, a zero line is connected with the capacitor and then connected to a fourth control node of the second relay, a live wire is connected with the fuse and then connected with the rectifier diode, the other end of the rectifier diode is respectively connected with the fourth control node of the second relay and one sides of the two parallel resistors, and the other sides of the two parallel resistors are connected with the input end of a first control node loop of the first relay.
Compared with the prior art, the invention has the following advantages:
According to the anti-interference system of the self-matching alternating-current contactor, disclosed by the invention, the voltage to be output when the contactor is in interference electricity is calculated, so that the internal resistance of the contactor is prevented from being measured manually, the parameters of the contactor are not required to be set, and the efficiency is improved;
according to the anti-interference system of the self-matching alternating current contactor, according to the characteristics of the contactor, the direct current voltage of the actual half-bridge alternating current-direct current conversion unit in the half-bridge rectification energy-saving mode is the holding voltage in the interference mode, so that the calculation is simple, the requirement of a CPU is reduced, and the system performance is improved.
Drawings
Fig. 1 is a block diagram of the entire structure of an anti-interference system of a self-matching ac contactor according to the present invention.
Fig. 2 is a schematic diagram of a voltage isolation conversion measurement unit of an anti-interference system of a self-matching ac contactor according to the present invention.
Fig. 3 is a schematic diagram of an ac-dc power supply unit of an anti-interference system of a self-matching ac contactor according to the present invention.
Fig. 4 is a schematic diagram of a super capacitor charging and discharging unit of an anti-interference system of a self-matching ac contactor according to the present invention.
Fig. 5 is a schematic diagram of a voltage conversion unit of an anti-electric-interference system of a self-matching ac contactor according to the present invention.
Fig. 6 is a schematic diagram of a PWM isolated output voltage unit of an anti-ringing system of a self-matching ac contactor according to the present invention.
Fig. 7 is a schematic diagram of a contactor voltage isolation conversion unit of an anti-interference system of a self-matching ac contactor according to the present invention.
Fig. 8 is a schematic diagram of a storage unit of an anti-electric-interference system of a self-matching ac contactor according to the present invention.
Fig. 9 is a schematic diagram of a switching value input/output unit of an anti-interference system of a self-matching ac contactor according to the present invention.
Fig. 10 is a schematic diagram of a half-bridge ac-dc conversion unit of an anti-interference system of a self-matching ac contactor, and a schematic diagram of a relay and a user control loop connection.
Detailed Description
The invention is illustrated in the following description with reference to the figures and examples:
As shown in fig. 1 to 10, an anti-interference system of a self-matching ac contactor comprises a central control unit, a voltage isolation conversion measurement unit, an ac-dc power supply unit, a half-bridge ac-dc conversion unit, a super capacitor charging-discharging unit, a voltage conversion unit, a PWM isolation output voltage unit, a contactor voltage isolation conversion unit, a first relay, a second relay, a storage unit and a switching value input-output unit;
The first relay and the second relay are both connected with the central control unit, and the first relay comprises a first control node J1-1 and a second control node J1-2; the second relay comprises a third control node J2-1 and a fourth control node J2-2;
The live wire is directly connected to the input end of a first control node J1-1 loop of the first relay, and when the first relay is positioned at a first control node J1-1 and the second relay is positioned at a third control node J2-1, the zero line of the live wire is directly connected with the fuse through the first control node J1-1 and then is output; when the first relay is positioned at a first control node J1-1 and the second relay is positioned at a fourth control node J2-2, mains supply is converted by a half-bridge AC/DC conversion unit and then passes through one end of the fourth control node and one end of the first control node, and a live wire is connected with a fuse through the other end of the first control node for output; when the first relay is positioned at the second control node, the first relay is output by the PWM isolation output voltage unit; .
In this embodiment, the voltage isolation conversion measurement unit includes a current limiting resistor, a voltage transformer, a sampling resistor and an RC filter, where an electric supply is connected to an input end of the voltage transformer through the current limiting resistor, an output end of the voltage transformer is connected in parallel with the sampling resistor, and then the electric supply is transmitted to the central control unit for analog-to-digital conversion after being subjected to the RC filter through the resistor and the capacitor; the voltage isolation conversion measurement unit is used for monitoring whether the mains supply is in interference electricity.
In this embodiment, the AC-DC power supply unit is connected to a mains supply, the live wire is connected to the self-recovery fuse, then connected in parallel with a varistor, connected in series with a winding resistor, and then connected to the input end of the AC/DC power supply module, and the output end of the AC/DC power supply module is connected in parallel with a filter capacitor and a TVS diode in sequence, and then outputs a DC voltage VIN for conversion.
In this embodiment, the half-bridge ac/dc conversion unit includes a capacitor, a fuse, a rectifier diode and a resistor, where the capacitor is connected to a mains supply, a zero line is connected to the capacitor and then connected to a fourth control node J2-2 of the second relay, a live line is connected to the fuse and then connected to the rectifier diode, the other end of the rectifier diode is respectively connected to the fourth control node J2-2 of the second relay and one side of two parallel resistors, and the other sides of the two parallel resistors are connected to the input end of the first control node J1-1 loop of the first relay; when the half-bridge AC/DC conversion unit is connected with the second control node J1-2 and the third control node J2-1, a loop is formed with the AC contactor coil, and the loop is in an energy-saving mode at the moment and is used for maintaining the attraction in the energy-saving mode, and meanwhile, the voltage basis for supplying power when the power interference occurs is provided.
In this embodiment, the super capacitor is charged by the super capacitor charging and discharging unit through the direct current voltage VIN output by the alternating current-to-direct current power supply unit through the first diode and the current limiting resistor, and when the commercial power is supplied, the output voltage VIN of the alternating current-to-direct current power supply unit directly supplies power to the voltage conversion unit through the first diode; when the mains supply is in power failure, the voltage of the super capacitor supplies power to the voltage conversion unit through the second diode;
In this embodiment, the voltage conversion unit converts the output voltage Ucc of the super capacitor charging and discharging unit, after capacitive filtering, the output end of the power module is connected to the input end of the power module in parallel, the filter capacitor and the TVS diode are connected in parallel, and after passing through the fuse, a dc voltage ucc_km is output and connected to one end of the second control node J1-2 of the first relay, so as to be used by the PWM isolation output voltage unit.
In this embodiment, the PWM isolation output voltage unit is connected to the second relay, and includes a resistor, an optocoupler, a field effect transistor driving circuit, and a field effect transistor, where the corresponding PWM pulse signal is generated by the output voltage from the central control unit according to the calculated power-on interference pattern, and is connected to the input end of the isolation optocoupler after the resistor is connected, the output end of the isolation optocoupler is connected to the field effect transistor driving circuit, the output end of the field effect transistor driving circuit is connected to the field effect transistor, and the output of the field effect transistor is connected to the other end of the second control node J1-2 of the first relay, so as to implement outputting the output voltage ucc_km of the voltage conversion unit in proportion.
In this embodiment, the contactor voltage isolation conversion unit includes an absorption capacitor, a voltage dividing resistor and an isolation operational amplifier, the contactor voltage isolation conversion unit is connected to two ends of an external ac contactor, the two ends of the ac contactor are connected in parallel with the absorption capacitor, then connected to an input end of the isolation operational amplifier after being divided by the resistor, an output end of the isolation operational amplifier is connected to a central control unit after being respectively connected in series with the resistor, and the central control unit measures ac/dc voltage on an actual contactor coil through differential operation; the contactor voltage isolation conversion unit is connected with an external alternating current contactor, voltage on the contactor is converted into a differential voltage signal through isolation and is transmitted to the central control unit, and the central control unit is converted into an actual alternating current/direct current signal through differential operation processing, so that signal acquisition under each operation mode of the alternating current contactor is realized.
In this embodiment, the storage unit includes a storage chip, and an external pull-up resistor is connected to the central control unit in a serial communication manner.
In this embodiment, the input/output unit is connected to the central control unit, and includes a switching value input and a switching value output;
The input/output unit is connected with the central control unit and comprises a switching value input module and a switching value output module;
the switching value input module is accessed by a state point of external equipment, is connected to the input end of the optical coupler after being divided, and the output end of the optical coupler is connected to the central control unit;
The switching value output module comprises a relay and a driving circuit, the central control unit is connected to the driving chip and then connected to the relay, and the relay output is connected to an external terminal for controlling external equipment.
In this embodiment, the working principle of the anti-interference system of the self-matching ac contactor of the present invention is as follows:
the central control unit controls the first relay to be positioned at a first control node J1-1, the alternating current contactor is positioned in an alternating current mode, the alternating current contactor is powered by mains supply, the external control button is conducted to obtain electricity, and the alternating current contactor is attracted;
The central control unit controls the first relay to be positioned at a second control node J1-2, controls the second relay to be positioned at a third control node J2-1, and the alternating current contactor is positioned in an energy-saving mode, and the half-bridge alternating current-direct current conversion unit outputs half-wave direct current voltage to maintain the attraction state of the contactor coil;
The central control unit simultaneously acquires the AC/DC voltage on the current AC contactor, and provides a data source for the output voltage of the PWM isolation output voltage unit.
When the electric interference occurs, the central control unit controls the first relay to be positioned at the second control node J1-2, the anti-electric interference system is positioned in an electric interference mode, and the PWM isolation output voltage unit outputs an equivalent direct current voltage to continuously maintain the attraction state of the contactor coil.
The foregoing is merely a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All technical schemes formed by equivalent transformation or equivalent substitution fall within the protection scope of the invention.
Claims (3)
1. An anti-interference system of a self-matching alternating current contactor is characterized in that: the device comprises a central control unit, a voltage isolation conversion measurement unit, an alternating current-to-direct current power supply unit, a half-bridge alternating current-to-direct current conversion unit, a super capacitor charging and discharging unit, a voltage conversion unit, a PWM isolation output voltage unit, a contactor voltage isolation conversion unit, a first relay, a second relay, a storage unit and a switching value input and output unit;
The first relay and the second relay are both connected with the central control unit, and the first relay comprises a first control node and a second control node; the second relay comprises a third control node and a fourth control node;
The voltage isolation conversion measurement unit comprises a current limiting resistor, a voltage transformer, a sampling resistor and RC filtering, wherein an electric supply is connected to the input end of the voltage transformer through the current limiting resistor, the output end of the voltage transformer is connected with the sampling resistor, and the electric supply is transmitted to the central control unit for analog-to-digital conversion after RC filtering through the resistor and the capacitor;
The alternating current-to-direct current power supply unit is connected with a mains supply, the live wire is connected with the self-recovery fuse, then connected with the varistor in parallel, connected with the winding resistor in series, then connected with the input end of the AC/DC power supply module, and the output end of the AC/DC power supply module is connected with the filter capacitor and the TVS diode in parallel in sequence and then outputs direct current voltage;
the half-bridge AC/DC conversion unit comprises a capacitor, a fuse, a rectifier diode and a resistor, wherein the capacitor is connected with the mains supply, a zero line is connected with the capacitor and then connected to a fourth control node of the second relay, a live wire is connected with the fuse and then connected with the rectifier diode, the other end of the rectifier diode is respectively connected with the fourth control node of the second relay and one side of two parallel resistors, and the other side of the two parallel resistors is connected with the input end of a first control node loop of the first relay;
The super capacitor charging and discharging unit charges the super capacitor through a first diode and a current-limiting resistor by using the direct-current voltage output by the alternating-current-to-direct-current power supply unit, when mains supply is supplied, the output voltage of the alternating-current-to-direct-current power supply unit directly supplies power to the voltage conversion unit through the first diode, and when the mains supply is lost, the voltage of the super capacitor supplies power to the voltage conversion unit through a second diode;
The voltage conversion unit converts the output voltage of the super capacitor charging and discharging unit, the output voltage is connected to the input end of the power module after being subjected to capacitor filtering, the output end of the power module is connected in parallel with the filter capacitor and the TVS diode, and after passing through the fuse, the output direct current is connected to one end of the second control node of the first relay in a pressing mode for being used by the PWM isolation output voltage unit;
The PWM isolation output voltage unit is connected to the second relay and comprises a resistor, an optocoupler, a field effect transistor driving circuit and a field effect transistor, a signal from a PWM control end of the central control unit is connected to an input end of the isolation optocoupler after being connected with the resistor, an output end of the isolation optocoupler is connected with the field effect transistor driving circuit, an output end of the field effect transistor driving circuit is connected with the field effect transistor, and an output end of the field effect transistor is connected to the other end of a second control node of the first relay;
the contactor voltage isolation conversion unit comprises an absorption capacitor, a voltage dividing resistor and an isolation operational amplifier, wherein the absorption capacitor, the voltage dividing resistor and the isolation operational amplifier are connected with two ends of an external alternating current contactor, the voltage on the alternating current contactor is firstly connected with the absorption capacitor in parallel, then is divided by the resistor and is connected with the input end of the isolation operational amplifier, the output end of the isolation operational amplifier is respectively connected with the resistor in series and then is connected with the central control unit, and the central control unit is used for measuring the alternating current and direct current voltage on an actual contactor coil through differential operation.
2. An anti-glare system for a self-mating ac contactor according to claim 1, wherein: the storage unit comprises a storage chip, is externally connected with a pull-up resistor and is connected with the central control unit in a serial communication mode.
3. An anti-glare system for a self-mating ac contactor according to claim 1, wherein: the input/output unit is connected with the central control unit and comprises a switching value input module and a switching value output module;
the switching value input module is accessed by a state point of external equipment, is connected to the input end of the optical coupler after being divided, and the output end of the optical coupler is connected to the central control unit;
The switching value output module comprises a relay and a driving circuit, the central control unit is connected to the driving chip and then connected to the relay, and the relay output is connected to an external terminal for controlling external equipment.
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| CN202111309979.7A CN114005703B (en) | 2021-11-08 | 2021-11-08 | Anti-interference system of self-matching alternating-current contactor |
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| CN101393819B (en) * | 2008-10-28 | 2011-04-20 | 福州大学 | Anti-flashover intelligent AC contactor |
| US9685950B2 (en) * | 2011-03-23 | 2017-06-20 | Shenzhen Ada Electronics Co., Ltd. | Energy-saving electronic touch switch |
| CN103633860B (en) * | 2013-11-26 | 2016-08-24 | 江苏国网自控科技股份有限公司 | Anti-shake electric installation adaptive control system |
| CN104935077B (en) * | 2015-05-08 | 2018-06-12 | 江苏国网自控科技股份有限公司 | For the Anti-electricity dazzling device and its control method of series capacitance type A.C. contactor |
| CN209562162U (en) * | 2019-04-29 | 2019-10-29 | 合肥朗辉电气有限公司 | A kind of anti-shake electric installation of energy-conserving intelligent |
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