CN216054491U - Anti-interference electricity system of self-matching AC contactor - Google Patents
Anti-interference electricity system of self-matching AC contactor Download PDFInfo
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- CN216054491U CN216054491U CN202122704326.0U CN202122704326U CN216054491U CN 216054491 U CN216054491 U CN 216054491U CN 202122704326 U CN202122704326 U CN 202122704326U CN 216054491 U CN216054491 U CN 216054491U
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Abstract
The utility model 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 measuring 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 an input and output unit. The utility model has reasonable structure, can automatically calculate the voltage to be output when the contactor is in the power failure, has simple calculation, can reduce the requirement on a CPU and improves the efficiency.
Description
Technical Field
The utility model 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, an alternating current contactor is widely applied to frequent operation and remote control of an industrial field and is one of important elements in an automatic control system. The working principle of the alternating current contactor is that a control loop is electrified, an electromagnetic coil generates electromagnetic attraction, and a main loop is closed. But once the voltage is shaken, the alternating current contactor is released, thereby influencing the operation of the equipment. Therefore, to ensure reliable operation of the equipment, a system is needed to provide the ac contactor with anti-flashover capability.
The existing ac contactor anti-interference system generally has the following defects: 1. most anti-flashover systems first acquire a parameter of the ac contactor, typically the coil resistance of the contactor. The anti-interference electricity system outputs fixed direct current voltage during electricity interference, and the direct current voltage output during electricity interference is configured by a manufacturer according to resistance values when the factory leaves a factory; the anti-interference electricity system with variable output direct current voltage is provided with parameters by a user on site, and then whether the alternating current contactor can be reliably attracted is verified. The two modes are not beneficial to on-site debugging and use, the workload is large, and the efficiency is low; 2. the method has the advantages that the coil current is small, the power factor is low when the anti-interference system works in an alternating current mode, the calculation is relatively complex and low in precision due to the fact that the contactor coil is not loaded in a resistive mode, and when the anti-interference system works in a half-bridge rectification energy-saving mode, the current transformer is saturated through direct current, and actual direct current is difficult to measure.
Chinese patent with patent publication No. CN211826985U discloses an anti-interference intelligent multifunctional controller, 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 loses power; 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 on/off of the main loop, but it makes the anti-dazzling electric device work stably through the self-detection function, and requires complex calculation, which has high requirements on the CPU.
Therefore, in order to solve the above background problems, it is urgent to develop an anti-interference system of a self-matching ac contactor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the background and provide an anti-interference system of a self-matching alternating current contactor, which has a reasonable structure and simple calculation and can reduce the requirement on a CPU.
The purpose of the utility model is realized as follows: an anti-interference electricity system of a self-matching alternating current contactor comprises a central control unit, a voltage isolation conversion measuring 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 an input and output unit;
the voltage isolation conversion measuring unit converts the commercial power signal, transmits the commercial power signal to the central control unit, and the central control unit collects and calculates the current commercial power state to control the working mode of the first relay and the second relay;
the voltage isolation conversion measuring unit comprises a current-limiting resistor, a voltage transformer, a sampling resistor and an RC filter, a mains supply signal 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 then is subjected to the RC filter through the resistor and the capacitor and then is transmitted to the central control unit for analog-digital conversion;
the AC-DC power supply unit is connected with a mains supply for supplying power, a live wire is connected with a self-recovery fuse and then connected with a voltage dependent resistor in parallel, a winding resistor is connected in series and then connected to the input end of the AC/DC power module, and the output end of the AC/DC power module is sequentially connected with a filter capacitor and a TVS diode in parallel and then outputs DC voltage;
the super capacitor charging and discharging unit charges a super capacitor bank through a first diode and a current-limiting resistor by using direct-current voltage output by an alternating-current to direct-current power supply unit, the super capacitor bank is formed by connecting a single super capacitor and a resistor in parallel and then in series, when commercial power is supplied, direct-current voltage VIN output by the alternating-current to direct-current power supply unit directly supplies power to the voltage conversion unit through the first diode, and when the commercial power is lost, the voltage of the super capacitor bank 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 filtered by the capacitor and then is connected to the input end of the power module, 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 a second control node of the first relay in a voltage-connected mode after passing through the fuse;
the PWM isolation output voltage unit comprises a resistor, an optical coupler, 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 with the resistor and then connected to an input end of the isolation optical coupler, an output end of the isolation optical coupler 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 divider resistor and an isolation operational amplifier, and is 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, and then connected with an input end of the isolation operational amplifier after being subjected to voltage division by the resistors, an output end of the isolation operational amplifier is connected to the central control unit after being connected with the resistors in series respectively, and the central control unit is used for measuring alternating current and direct current voltages on coils of the actual contactor through differential operation processing.
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 and 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 connected with the input end of the optical coupler after voltage division by a state point of external equipment, and the output end of the optical coupler is connected to the central control unit;
the switching value output module is composed of a relay and a driving circuit, the central control unit is connected to the driving chip and then connected to the relay, and the output of the relay is connected to the external terminal and used 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 a 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 the first control node and the second relay is positioned at the third control node, the commercial power is directly connected with the fuse output after passing through the first third control node; when the first relay is positioned at the first control node and the second relay is positioned at the fourth control node, the commercial power is converted by the half-bridge alternating current-direct current 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 passes through the other end of the first control node and is connected with the fuse output; when the first relay is positioned at a second control node, the PWM isolation output voltage unit outputs the voltage;
half-bridge alternating current-direct current conversion unit includes electric capacity, fuse, rectifier diode and resistance, connects the commercial power, connects on the fourth control node of second relay behind the electric capacity is connected to the zero line, and the fuse is connected to the live wire, reconnection rectifier diode, and the fourth control node of second relay and one side of two parallelly connected resistances are connected respectively to rectifier diode's the other end, and the input in the first control node return circuit of first relay is connected to the opposite side of two parallelly connected resistances.
Compared with the prior art, the utility model has the following advantages:
according to the anti-interference system of the self-matching alternating current contactor, the voltage to be output when the contactor is in interference is calculated, the manual measurement of the internal resistance of the contactor is avoided, the parameter of the contactor does not need to be set, and the efficiency is improved;
according to the anti-interference system of the self-matching alternating current contactor, the direct current voltage of an actual half-bridge alternating current-direct current conversion unit in a half-bridge rectification energy-saving mode is the holding voltage in an interference mode according to the characteristics of the contactor, the calculation is simple, the requirement of a CPU is reduced, and the system performance is improved.
Drawings
Fig. 1 is a block diagram illustrating an overall 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 measuring unit of an anti-flashover system of a self-matching ac contactor according to the present invention.
Fig. 3 is a schematic diagram of an ac-to-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 charge and discharge unit of an anti-flashover system of a self-matching ac contactor according to the present invention.
Fig. 5 is a schematic diagram of a voltage converting unit of an anti-flashover 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-flashover system of a self-matched ac contactor according to the present invention.
Fig. 7 is a schematic diagram of a contactor voltage isolation converting unit of an anti-flashover system of a self-matching ac contactor according to the present invention.
Fig. 8 is a schematic diagram of a memory cell of an anti-flashover 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-flashover 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 according to the present invention, and a connection schematic diagram of a relay and a user control circuit.
Detailed Description
The utility model is described below with reference to the accompanying drawings and specific embodiments:
as shown in fig. 1 to 10, an anti-interference electricity system of a self-matching ac contactor includes a central control unit, a voltage isolation conversion measuring unit, an ac-to-dc power supply unit, a half-bridge ac-to-dc 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/output unit;
the first relay and the second relay are both connected with a central control unit, and the first relay comprises a first control node J1-1 and a second control node J1-2; the second relay includes a third control node J2-1 and a fourth control node J2-2;
the live wire is directly connected with the input end of a first control node J1-1 loop of the first relay, and when the first relay is positioned at the first control node J1-1 and the second relay is positioned at the third control node J2-1, the live wire and zero wire are directly connected with the fuse output after passing through the first control node J1-1; 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, the commercial power is converted by the half-bridge alternating current-direct current 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 output through the other end of the first control node; when the first relay is at the second control node, the PWM isolation output voltage unit outputs the voltage.
In this embodiment, the voltage isolation conversion measuring unit includes a current-limiting resistor, a voltage transformer, a sampling resistor and an RC filter, a commercial power signal is connected to an input end of the voltage transformer through the current-limiting resistor, an output end of the voltage transformer is connected to the sampling resistor in parallel, and then is subjected to the RC filter through the resistor and the capacitor and then is transmitted to the central control unit for analog-to-digital conversion; the voltage isolation conversion measuring unit is used for monitoring whether the mains supply is subjected to electric dazzling.
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, and then connected to the voltage dependent resistor, and then connected to the input terminal of the AC/DC power module after being connected to the winding resistor in series, and the output terminal of the AC/DC power module is sequentially connected to the filter capacitor and the TVS diode in parallel and then outputs the 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, and is connected to the utility power, the zero line is connected to the capacitor and then connected to the fourth control node J2-2 of the second relay, the live line is connected to the fuse, and then connected to the rectifier diode, the other end of the rectifier diode is connected to the fourth control node J2-2 of the second relay and one side of the two parallel resistors, respectively, and the other side of the two parallel resistors is connected to the input end of the first control node J1-1 loop of the first relay; when the half-bridge alternating current-direct current conversion unit is connected with the second control node J1-2 and the third control node J2-1, a loop is formed with an alternating current contactor coil, and the loop is in an energy-saving mode at the moment and is used for pull-in maintenance in the energy-saving mode, and meanwhile, a voltage basis for power supply when power interference occurs is provided.
In this embodiment, the super capacitor charging and discharging unit charges the super capacitor through the first diode and the current-limiting resistor by the dc voltage VIN output by the ac-to-dc power supply unit, and when the commercial power is supplied, the output voltage VIN of the ac-to-dc 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, the output voltage Ucc is filtered by a capacitor and then connected to the input terminal of the power module, the output terminal of the power module is connected in parallel with the filter capacitor and the TVS diode, and after passing through a 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 fet driving circuit, and a fet, and generates a corresponding PWM pulse signal according to the output voltage of the calculated interference mode from the central control unit, and is connected to the input end of the isolation optocoupler after being connected to the resistor, and the output end of the isolation optocoupler is connected to the fet driving circuit, and the output end of the fet driving circuit is connected to the fet, and the output end of the fet is connected to the other end of the second control node J1-2 of the first relay, so as to output 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, two ends of the ac contactor are connected in parallel with the absorption capacitor, and then connected to an input end of the isolation operational amplifier after voltage division by the resistor, an output end of the isolation operational amplifier is connected in series with the resistor and then connected to the central control unit, and the central control unit measures ac/dc voltage on an actual contactor coil through differential operation processing; the voltage isolation conversion unit of the contactor is connected with an external alternating current contactor, voltage on the contactor is converted into differential voltage signals through isolation and then transmitted to the central control unit, and the central control unit converts the differential voltage signals into actual alternating current and direct current signals through differential operation processing, so that signal acquisition of the alternating current contactor in each operation mode is realized.
In this embodiment, the memory unit includes a memory chip, is externally connected with a pull-up resistor, and is connected with the central control unit in a serial communication manner.
In the embodiment, the input and output unit is connected with the central control unit and comprises a switching value input and a switching value output;
the input and 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 connected with the input end of the optical coupler after voltage division by a state point of external equipment, 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 output of the relay is connected to an external terminal and used for controlling external equipment.
In this embodiment, the anti-interference system of the self-matching ac contactor according to the present invention operates as follows:
the central control unit controls the first relay to be at a first control node J1-1, the alternating current contactor is in an alternating current mode and is powered by mains supply, the external control button is conducted to obtain power, and the alternating current contactor is attracted;
the central control unit controls the first relay to be at a second control node J1-2, controls the second relay to be at a third control node J2-1, controls the alternating current contactor to be in an energy-saving mode, and outputs a half-wave direct current voltage to maintain the attraction state of a contactor coil by the half-bridge alternating current-direct current conversion unit;
the central control unit simultaneously obtains the AC/DC voltage of the current AC contactor and provides a data source for the voltage output by the PWM isolation output voltage unit.
During the power-on state, the central control unit controls the first relay to be at a second control node J1-2, the anti-power-on state of the anti-power-on state is a power-on mode, and the PWM isolation output voltage unit outputs an equivalent direct current voltage to continuously maintain the pull-in state of the contactor coil.
The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (3)
1. An anti-interference electricity system from matching ac contactor which characterized in that: the device comprises a central control unit, a voltage isolation conversion measuring 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 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 measuring unit comprises a current-limiting resistor, a voltage transformer, a sampling resistor and an RC filter, a mains supply signal 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 then is subjected to the RC filter through a resistor and a capacitor and then is transmitted to the central control unit for analog-digital conversion;
the AC-DC power supply unit is connected with a mains supply for supplying power, a live wire is connected with a self-recovery fuse and then connected with a voltage dependent resistor in parallel, a winding resistor is connected in series and then connected to the input end of the AC/DC power module, and the output end of the AC/DC power module is sequentially connected with a filter capacitor and a TVS diode in parallel and then outputs DC voltage;
the half-bridge alternating current-direct current conversion unit comprises a capacitor, a fuse, a rectifier diode and resistors, is connected with commercial power, is connected with the fourth control node of the second relay after a zero line is connected with the capacitor, is connected with the fuse and then is 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 each of the two parallel resistors, and the other side of each of the two parallel resistors is connected with the input end of the 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 direct-current voltage output by the alternating current-to-direct current power supply unit, when commercial power 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 commercial power is lost, the voltage of the super capacitor supplies power to the voltage conversion unit through the second diode;
the voltage conversion unit converts the output voltage of the super capacitor charging and discharging unit, the output voltage is filtered by the capacitor and then is connected to the input end of the power module, 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 a second control node of the first relay in a voltage-connected mode after passing through the fuse and is used by the PWM isolation output voltage unit;
the PWM isolation output voltage unit is connected to a second relay and comprises a resistor, an optical coupler, a field effect tube driving circuit and a field effect tube, a signal from a PWM control end of the central control unit is connected to the input end of the isolation optical coupler after being connected with the resistor, the output end of the isolation optical coupler is connected with the field effect tube driving circuit, the output end of the field effect tube driving circuit is connected with the field effect tube, and the output end of the field effect tube is connected to the other end of a second control node of the first relay;
the voltage isolation conversion unit of the contactor comprises an absorption capacitor, a divider resistor and an isolation operational amplifier, the voltage isolation conversion unit is 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 connected to the input end of the isolation operational amplifier after being divided by the resistor, the output end of the isolation operational amplifier is respectively connected with the resistor in series and then is connected to the central control unit, and the central control unit is used for measuring alternating current voltage and direct current voltage on an actual contactor coil through differential operation processing.
2. The anti-flashover system of the self-matching ac contactor as claimed in 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. The anti-flashover system of the self-matching ac contactor as claimed in claim 1, wherein: the input and 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 connected with the input end of the optical coupler after voltage division by a state point of external equipment, 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 output of the relay is connected to an external terminal and used for controlling external equipment.
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| CN202122704326.0U CN216054491U (en) | 2021-11-08 | 2021-11-08 | Anti-interference electricity system of self-matching AC contactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114005703A (en) * | 2021-11-08 | 2022-02-01 | 江苏安科瑞电器制造有限公司 | Anti-interference electricity system of self-matching AC contactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114005703A (en) * | 2021-11-08 | 2022-02-01 | 江苏安科瑞电器制造有限公司 | Anti-interference electricity system of self-matching AC contactor |
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