阅读说明：本技术 瞬时断电再启动控制器 (Instantaneous power-off restart controller ) 是由 许玉蕊 初秀荣 许征鹏 于 2020-12-01 设计创作，主要内容包括：本发明瞬时断电再启动控制器由电源单元1、检测单元2、直启单元3、软启单元4组成,当生产系统正在运行的电机因电网瞬时断电而造成停机,如电网电压在允许直接启动的时间内恢复正常,电机直接启动因电网瞬时断电造成停机的电机；如电网电压不能在允许直接启动的时间内恢复正常,但可以允许软启的时间内恢复正常时,电机通过软启启动因电网瞬时断电造成停机的电机；如电网电压没有在允许的时间内恢复正常,则控制器闭锁,不再起动设备的一种防晃电控制器,可广泛用于常规交流接触器控制的电机、变频器或软启动器控制的电机再起动,具有结构简单、可靠性高、体积小、安装方便等优点。(The instantaneous power-off restart controller comprises a power supply unit 1, a detection unit 2, a direct start unit 3 and a soft start unit 4, wherein when a motor which is running in a production system is stopped due to the instantaneous power-off of a power grid, if the voltage of the power grid is recovered to be normal within the time of allowing direct start, the motor directly starts the motor which is stopped due to the instantaneous power-off of the power grid; if the voltage of the power grid can not be recovered to be normal within the time of allowing direct starting, but can be recovered to be normal within the time of allowing soft starting, the motor is started through the soft starting, and the motor is stopped due to instantaneous power failure of the power grid; if the voltage of the power grid does not return to normal within the allowed time, the controller is locked, and the anti-interference controller of the equipment is not started any more, can be widely used for restarting a motor controlled by a conventional alternating current contactor, a frequency converter or a motor controlled by a soft starter, and has the advantages of simple structure, high reliability, small volume, convenience in installation and the like.)

1. Instantaneous outage restart controller comprises power supply unit (1), detecting element (2), directly starts unit (3), soft start unit (4), its characterized in that: the alternating current side A1 and A2 of the power supply unit (1) are connected with an alternating current system power supply, U1 and U2 are connected with a motor power supply in parallel, the positive pole of the direct current output side is connected with the detection unit (2), the direct starting unit (3) and the soft starting unit (4) through the positive pole of a direct current bus, the negative pole of the direct current output side is connected with the negative pole of the direct current bus and grounded, the signal output of the detection unit (2) is connected with the trigger pole of a direct starting driving thyristor (VT 1) of the direct starting unit (3), and the emitter of the direct starting driving thyristor (VT 1) of the direct starting unit (3) is connected with the trigger pole of the soft starting driving thyristor (VT 3) of the soft;

the power supply unit (1) comprises a power transformer (T), a load transformer (T1), an adjustable resistor (R), a relay (K), an energy storage capacitor (C), a diode I (1D), a diode II (2D) and a rectifier module (RB), wherein the input end of the power transformer (T) is connected with an alternating current system power supply, one pole of the output end of the power transformer (T) is connected with the adjustable resistor (R), the negative pole of the energy storage capacitor (C) and the negative pole of a direct current bus in parallel, the other pole of the output end of the power transformer (T) is connected with a coil and a normally open contact of the relay (K), the other pole of the coil of the relay (K) is connected with the negative pole of the direct current bus through the, the other end of the normally open contact of the relay (K) is connected with a diode I (1D) and a diode II (2D) in series and then is connected with the anode of the energy storage capacitor (C) through a direct current bus; the input end of the load transformer (T1) is connected with the motor power supply in parallel, the output end of the load transformer is connected with the alternating current end of the rectifier module (RB), the positive electrode of the direct current end of the rectifier module (RB) is connected with the positive electrode of the direct current bus, and the negative electrode of the load transformer is connected with the negative electrode of the direct current bus and grounded; the diode I (1D) and the diode II (2D) are reversely butted;

the method is characterized in that: the detection unit (2) consists of a low-voltage regulation potentiometer (R1), a photoelectric coupler (B), a 1# isolation diode (VD 1) and a current-limiting resistor (R2), one end of the low-voltage regulation potentiometer (R1) is connected with the positive electrode of the direct current end of the three-phase rectification module (RB), the other end of the low-voltage regulation potentiometer is connected with a light-emitting tube of the photoelectric coupler (B), the other end of the light-emitting tube of the photoelectric coupler (B) is grounded, a collector of the photoelectric coupler (B) is connected with one end of the current-limiting resistor (R2), an emitter of the photoelectric coupler (B) is grounded, the other end of the current-limiting resistor (R2) is connected with the negative electrode of the 1# isolation diode (VD 1), and the positive electrode of the 1# isolation diode (VD 1) is;

the method is characterized in that: the direct start unit (3) consists of a direct start adjusting potentiometer (R3), an energy storage capacitor (C2), a direct start driving thyristor (VT 1), a direct start thyristor (VT 2), a direct start holding capacitor (C1), a direct start current limiting resistor (R4) and a direct start relay (K1), one end of the direct start adjusting potentiometer (R3) is connected to the negative electrode of a No. 1 isolation diode (VD 1) in the detection unit (2), the direct start adjusting potentiometer (R3) and the other end of the energy storage capacitor (C2) are connected to the ground in parallel, the emitter of the direct start driving thyristor (VT 1) is connected to the direct start holding capacitor (C1) and the collector of the photoelectric coupler (B) in the detection unit (2) in parallel, the gate of the direct start adjusting potentiometer (R3) and the other end of the energy storage capacitor (C2) are connected to the ground, the emitter of the direct start driving thyristor (VT 1) is connected to the direct start holding capacitor (C1) and the negative electrode of the direct start driving thyristor is connected to the direct start holding, the other end of the direct-starting current-limiting resistor (R4) is connected with a gate pole of a direct-starting thyristor (VT 2), a collector of the direct-starting thyristor (VT 2) is connected with the positive pole of the direct-current end of the three-phase rectification module (RB), an emitter of the direct-starting thyristor (VT 2) is connected with a coil of a direct-starting relay (K1), the other end of the coil of the direct-starting relay (K1) is grounded, and a contact of the direct-starting relay (K1) serves as a system direct-starting command signal source;

the method is characterized in that: the soft start unit (4) consists of a soft start adjusting potentiometer (R6), a soft start energy storage capacitor (C4), a soft start driving thyristor (VT 3), a 2# isolation diode (VD 2), a soft start thyristor (VT 4), a soft start holding capacitor (C3), a soft start current limiting resistor (R7) and a soft start relay (K2), wherein a gate pole of the soft start driving thyristor (VT 3) is connected with an emitter of the direct start driving thyristor (VT 1) through the soft start driving current limiting resistor (R5), a collector electrode of the soft start driving thyristor (VT 3) is connected with a direct current end anode of the three-phase rectifying module (RB) through the 2# isolation diode (VD 2), the soft start energy storage capacitor (C4) is connected in parallel, the other end of the soft start energy storage capacitor (C4) is grounded, the emitter of the soft start driving thyristor (VT 3) is connected with the soft start holding capacitor (C3), the soft adjusting potentiometer (R6) and a current limiting resistor (R7) at one end of the soft start driving thyristor, the other end of the soft start regulating potentiometer (R6) and the negative electrode of the soft start holding capacitor (C3) are grounded, the other end of the soft start current limiting resistor (R7) is connected with the gate pole of the soft start thyristor (VT 4), the collector electrode of the soft start thyristor (VT 4) is connected with the positive electrode of the direct current end of the three-phase rectification module (RB) through the normally closed contact of the direct start relay (K1), the emitter electrode of the soft start thyristor (VT 4) is connected with the coil of the soft start relay (K2), the other end of the coil of the soft start relay (K2) is grounded, and the contact of the soft start relay (K2) is used as a system soft start instruction signal source.

2. The instantaneous power outage restart controller of claim 1, characterized in that: the capacities of the soft start holding capacitor (C3) and the soft start energy storage capacitor (C4) are both larger than that of the direct start energy storage capacitor (C2).

Technical Field

The invention belongs to the field of industrial electrical control, belongs to a controller, and relates to an instantaneous power-off restart controller.

Background

In industrial production, short-time voltage fluctuation or instantaneous power failure of a power grid is caused by lightning stroke, short circuit or other reasons, so that a plurality of important low-voltage motors are stopped, a continuous production process is disordered, and huge loss and even safety accidents are caused to enterprises. Although the voltage fluctuation or the power failure process is short, the system cannot normally operate even if the voltage recovers to the normal power supply in a short time because a contactor, a frequency converter, a soft start and the like in the system break a loop due to voltage loss.

The invention provides a motor which is used for starting a motor which is stopped due to the instantaneous power failure or voltage fluctuation of a power grid according to preset restarting time when the motor which is running in a production system is stopped due to the instantaneous power failure or voltage fluctuation of the power grid, for example, the voltage of the power grid is recovered to be normal within the allowed time. If the grid voltage does not return to normal within the allowed time, the controller locks and does not start the equipment. The method can be widely applied to the restarting of the motor controlled by the conventional alternating current contactor and the restarting of the motor controlled by the frequency converter or the soft starter, and has the advantages of high reliability, small volume, convenience in installation, simple wiring and the like.

Disclosure of Invention

The instantaneous power-off restart controller of the invention consists of a power supply unit 1, a detection unit 2, a direct start unit 3 and a soft start unit 4, and is characterized in that: the alternating current side A1 and A2 of the power supply unit 1 are connected with an alternating current system power supply, U1 and U2 are connected with a motor power supply in parallel, the positive pole of the direct current output side is connected with the detection unit 2, the direct starting unit 3 and the soft starting unit 4 through the positive pole of a direct current bus, the negative pole of the direct current output side is connected with the negative pole of the direct current bus and grounded, the signal output of the detection unit 2 is connected with the trigger pole of the direct starting driving thyristor VT1 of the direct starting unit 3, and the emitter of the direct starting driving thyristor VT1 of the direct starting unit 3 is connected with the trigger pole of the soft starting driving thyristor VT3 of;

the power supply unit 1 comprises a power supply transformer T, a load transformer T1, an adjustable resistor R, a relay K, an energy storage capacitor C, a diode I1D, a diode II 2D and a rectification module RB, wherein the input end of the power supply transformer T is connected with an alternating current system power supply, one pole of the output end of the power supply transformer T is connected with the adjustable resistor R, the cathode of the energy storage capacitor C and the cathode of a direct current bus in parallel, the other pole of the output end of the power supply transformer T is connected with a coil and a normally open contact of the relay K, the other pole of the coil of the relay K is connected with the cathode of the direct current bus through the adjustable resistor R, and the other end of the normally open contact of the relay K is connected with the anode of the direct current bus after; the input end of the load transformer T1 is connected with the motor power supply in parallel, the output end is connected with the alternating current end of the rectifier module RB, the positive electrode of the direct current end of the rectifier module RB is connected with the positive electrode of the direct current bus, and the negative electrode of the direct current bus is connected with the negative electrode of the direct current bus and grounded; the diode I1D and the diode II 2D are reversely butted;

the detection unit 2 consists of a low-voltage adjusting potentiometer R1, a photoelectric coupler B, a 1# isolating diode VD1 and a current-limiting resistor R2, one end of the low-voltage adjusting potentiometer R1 is connected with the positive electrode of the direct current end of the three-phase rectification module RB, the other end of the low-voltage adjusting potentiometer R1 is connected with the light-emitting tube of the photoelectric coupler B, the other end of the light-emitting tube of the photoelectric coupler B is grounded, the collector of the photoelectric coupler B is connected with one end of the current-limiting resistor R2, the emitter of the photoelectric coupler B is grounded, the other end of the current-limiting resistor R2 is connected with the negative electrode of the 1# isolating diode VD1, and the positive electrode of the;

the direct start unit 3 consists of a direct start adjusting potentiometer R3, an energy storage capacitor C2, a direct start driving thyristor VT1, a direct start thyristor VT2, a direct start holding capacitor C1, a direct start current limiting resistor R4 and a direct start relay K1, one end of the direct start adjusting potentiometer R3 is connected to the negative electrode of a No. 1 isolating diode VD1 in the detection unit 2 and is connected in parallel with the positive electrode of the direct start energy storage capacitor C2 and the collector of the direct start driving thyristor VT1, the gate of the direct start driving thyristor VT1 is connected in parallel with the collector of the photoelectric coupler B in the detection unit 2, the other ends of the direct start adjusting potentiometer R3 and the energy storage capacitor C2 are grounded, the emitter of the direct start driving thyristor VT1 is connected in parallel with one end of the direct start holding capacitor C1 and the direct start holding resistor R4, the negative electrode of the direct start holding capacitor C1 is grounded, the other end of the direct start current limiting resistor R4 is connected with the gate of the direct start three-phase rectifying thyristor RB current limiting module positive electrode current limiting, an emitter electrode of the direct start thyristor VT2 is connected with a coil of a direct start relay K1, the other end of the coil of the direct start relay K1 is grounded, and a contact of the direct start relay K1 is used as a system direct start command signal source;

the soft start unit 4 consists of a soft start adjusting potentiometer R6, a soft start energy storage capacitor C4, a soft start driving thyristor VT3, a 2# isolation diode VD2, a soft start thyristor VT4, a soft start holding capacitor C3, a soft start current limiting resistor R7 and a soft start relay K2, wherein a gate pole of the soft start driving thyristor VT3 is connected with an emitter pole of the direct start driving thyristor VT1 through the soft start driving current limiting resistor R5, a collector pole of the soft start driving thyristor VT3 is connected with a positive pole of a direct current end of the three-phase rectification module RB through the 2# isolation diode VD2 and is connected with a positive pole of the soft start energy storage capacitor C4 in parallel, the other end of the soft start energy storage capacitor C4 is grounded, the emitter pole of the soft start driving thyristor VT3 is connected with one end of the soft start holding capacitor C3, the soft start adjusting potentiometer R6 and the soft start current limiting resistor R7 in parallel, the other end of the soft start adjusting potentiometer R6 and the soft start current limiting resistor VT4, the collector of the soft start thyristor VT4 is connected with the positive electrode of the direct current end of the three-phase rectifier module RB through the normally closed contact of the soft start relay K1, the emitter of the soft start thyristor VT4 is connected with the coil of the soft start relay K2, the other end of the coil of the soft start relay K2 is grounded, and the contact of the soft start relay K2 is used as a system soft start instruction signal source.

Drawings

The invention is described in further detail below with reference to the following figures and detailed description:

FIG. 1 is a wiring schematic of the present invention;

in the figure: 1: power supply unit, 2: detection unit, 3: direct start unit, 4: soft start unit, T: power transformer, T1: load transformer, R: adjustable resistance, K: a relay and C: energy storage capacitor, 1D: diodes 1, 2D diodes 2, RB: rectifier module, R1: low-voltage regulation potentiometer, B: photocoupler, VD 1: 1# isolation diode, R2: current limiting resistor, R3: start-up adjustment potentiometer, C1: direct start holding capacitance, C2: direct-start energy storage capacitor, VT 1: direct-start drive thyristor, R4: direct-start current-limiting resistor, VT 2: direct-start thyristor, K1: direct-start relay, R5: soft-start drive current-limiting resistance, VT 3: soft-start drive thyristor, VD 2: 2# isolation diode, C3: soft-start holding capacitance, R6: soft start adjustment potentiometer, C4: soft-start energy storage capacitor, R7: soft-start current-limiting resistance, VT 4: soft-start thyristor, K2: and (6) soft starting the relay.

Detailed Description

The instantaneous power-off restart controller of the invention consists of a power supply unit 1, a detection unit 2, a direct start unit 3 and a soft start unit 4, and is characterized in that: the alternating current side A1 and A2 of the power supply unit 1 are connected with an alternating current system power supply, U1 and U2 are connected with a motor power supply in parallel, the positive pole of the direct current output side is connected with the detection unit 2, the direct starting unit 3 and the soft starting unit 4 through the positive pole of a direct current bus, the negative pole of the direct current output side is connected with the negative pole of the direct current bus and grounded, the signal output of the detection unit 2 is connected with the trigger pole of the direct starting driving thyristor VT1 of the direct starting unit 3, and the emitter of the direct starting driving thyristor VT1 of the direct starting unit 3 is connected with the trigger pole of the soft starting driving thyristor VT3 of;

the power supply unit 1 comprises a power supply transformer T, a load transformer T1, an adjustable resistor R, a relay K, an energy storage capacitor C, a diode I1D, a diode II 2D and a rectification module RB, wherein the input end of the power supply transformer T is connected with an alternating current system power supply, one pole of the output end of the power supply transformer T is connected with the adjustable resistor R, the cathode of the energy storage capacitor C and the cathode of a direct current bus in parallel, the other pole of the output end of the power supply transformer T is connected with a coil and a normally open contact of the relay K, the other pole of the coil of the relay K is connected with the cathode of the direct current bus through the adjustable resistor R, and the other end of the normally open contact of the relay K is connected with the anode of the direct current bus after; the input end of the load transformer T1 is connected with the motor power supply in parallel, the output end is connected with the alternating current end of the rectifier module RB, the positive electrode of the direct current end of the rectifier module RB is connected with the positive electrode of the direct current bus, and the negative electrode of the direct current bus is connected with the negative electrode of the direct current bus and grounded; the diode I1D and the diode II 2D are reversely butted;

the detection unit 2 is composed of a low-voltage regulation potentiometer R1, a photoelectric coupler B, a 1# isolation diode VD1 and a current-limiting resistor R2, one end of the low-voltage regulation potentiometer R1 is connected with the positive electrode of the direct current end of a three-phase rectification module RB, the other end of the low-voltage regulation potentiometer R1 is connected with the light-emitting tube of the photoelectric coupler B, the other end of the light-emitting tube of the photoelectric coupler B is grounded, the collector electrode of the photoelectric coupler B is connected with one end of a current-limiting resistor R2, the emitter electrode of the photoelectric coupler B is grounded, the other end of the current-limiting resistor R2 is connected with the negative electrode of a 1# isolation diode VD1, and the positive.

The system supplies power normally and the motor operates normally, the power supply unit 1 provides continuous and stable power supply voltage for the direct current bus through the rectifier module RB through the load side transformer T1, a light emitting tube in the photoelectric coupler B is lightened, light irradiates on the photoelectric thyristor, the photoelectric thyristor is conducted in a low resistance mode, the gate pole potential of the direct start driving thyristor VT1 is pulled to a low potential, and the direct start driving thyristor VT1 is cut off; the power transformer T continuously supplies power to the relay K, the diode I1D and the diode II 2D which are in reverse butt joint are mutually cut off, and a system power supply cannot supply power to the direct-current bus.

The direct start unit 3 consists of a direct start adjusting potentiometer R3, an energy storage capacitor C2, a direct start driving thyristor VT1, a direct start thyristor VT2, a direct start holding capacitor C1, a direct start current limiting resistor R4 and a direct start relay K1, one end of the direct start adjusting potentiometer R3 is connected to the negative electrode of a No. 1 isolating diode VD1 in the detection unit 2 and is connected in parallel with the positive electrode of the direct start energy storage capacitor C2 and the collector of the direct start driving thyristor VT1, the gate of the direct start driving thyristor VT1 is connected in parallel with the collector of the photoelectric coupler B in the detection unit 2, the other ends of the direct start adjusting potentiometer R3 and the energy storage capacitor C2 are grounded, the emitter of the direct start driving thyristor VT1 is connected in parallel with one end of the direct start holding capacitor C1 and the direct start holding resistor R4, the negative electrode of the direct start holding capacitor C1 is grounded, the other end of the direct start current limiting resistor R4 is connected with the gate of the direct start three-phase rectifying thyristor RB current limiting module positive electrode current limiting, the emitter of the direct-start thyristor VT2 is connected with the coil of the direct-start relay K1, the other end of the coil of the direct-start relay K1 is grounded, and the contact of the direct-start relay K1 is used as a system direct-start command signal source.

When the system is in instantaneous power failure or the voltage is low below the set threshold of the voltage regulation potentiometer R1, the light-emitting tube in the photoelectric coupler B is extinguished, the photoelectric thyristor is in high resistance, and the direct-starting energy-storage capacitor C2 raises the gate potential of the direct-starting driving thyristor VT1 through the current-limiting resistor R2; the direct-starting regulating potentiometer R3 regulates the discharge time of the direct-starting energy storage capacitor C2, when the discharge of the direct-starting energy storage capacitor C2 is completed, and the system voltage returns to normal, the power transformer T is powered to close the normally open contact of the relay K, half of alternating current waves leaked by the diode I1D and the diode II 2D which are in butt joint in the reverse direction due to the volt-ampere characteristic of the diodes charge the energy storage capacitor C, and the energy storage capacitor C continues to supply power to the direct-current bus after the two diodes are switched off; because the direct-starting holding capacitor C1 continuously conducts the direct-starting thyristor VT2, the coil of the direct-starting relay K1 is electrified and closed, and a direct-starting signal is sent out for the system.

The soft start unit 4 consists of a soft start adjusting potentiometer R6, a soft start energy storage capacitor C4, a soft start driving thyristor VT3, a 2# isolation diode VD2, a soft start thyristor VT4, a soft start holding capacitor C3, a soft start current limiting resistor R7 and a soft start relay K2, wherein a gate pole of the soft start driving thyristor VT3 is connected with an emitter pole of the direct start driving thyristor VT1 through the soft start driving current limiting resistor R5, a collector pole of the soft start driving thyristor VT3 is connected with a positive pole of a direct current end of the three-phase rectification module RB through the 2# isolation diode VD2 and is connected with a positive pole of the soft start energy storage capacitor C4 in parallel, the other end of the soft start energy storage capacitor C4 is grounded, the emitter pole of the soft start driving thyristor VT3 is connected with one end of the soft start holding capacitor C3, the soft start adjusting potentiometer R6 and the soft start current limiting resistor R7 in parallel, the other end of the soft start adjusting potentiometer R6 and the soft start current limiting resistor VT4, the collector of the soft start thyristor VT4 is connected with the positive electrode of the direct current end of the three-phase rectifier module RB through the normally closed contact of the soft start relay K1, the emitter of the soft start thyristor VT4 is connected with the coil of the soft start relay K2, the other end of the coil of the soft start relay K2 is grounded, and the contact of the soft start relay K2 is used as a system soft start instruction signal source.

The capacities of the soft start holding capacitor C3 and the soft start energy storage capacitor C4 are both larger than that of the direct start energy storage capacitor C2.

When the system is in instantaneous power failure or the voltage is low below the set threshold of the voltage regulation potentiometer R1, and the system voltage recovers to be normal, after the discharge of the direct-starting energy storage capacitor C2 and the direct-starting holding capacitor C1 is completed, the direct-starting driving thyristor VT1 is cut off and cannot conduct the direct-starting thyristor VT2 due to the fact that the gate electrode of the direct-starting driving thyristor VT1 is low in the normal time of the system voltage recovery again, and a direct-starting loop fails;

when the system is in instantaneous power failure or the voltage is lower than the set threshold value of the voltage regulation potentiometer R1, the direct start driving thyristor VT1 drives the soft start driving thyristor VT3 to be conducted, the soft start energy storage capacitor C4 charges the soft start holding capacitor C3, the gate potential of the soft start thyristor VT4 is increased, when the system voltage recovers to be normal, the direct start relay K1 cannot be closed when the system voltage recovers to be normal again after the direct start energy storage capacitor C2 and the direct start holding capacitor C1 discharge, the soft start thyristor VT4 continues to be conducted because the capacity of the soft start holding capacitor C3 is larger than the direct start energy storage capacitor C2, the coil of the soft start relay K2 is electrified, and the contact is closed to be a system soft start command;

the discharging time of the soft start holding capacitor C3 is adjusted by adjusting the soft start adjusting potentiometer R6, when the time of instantaneous power failure or voltage reduction below the set threshold of the voltage adjusting potentiometer R1 exceeds the discharging time of the soft start holding capacitor C3, the soft start thyristor VT4 is not conducted any more when the system voltage returns to normal, the soft start relay K2 cannot be closed, and a soft start loop signal cannot be sent.

When the motor in operation of the production system is stopped due to instantaneous power failure of the power grid, if the voltage of the power grid is recovered to be normal within the time allowing direct starting, the motor directly starts the motor stopped due to instantaneous power failure of the power grid; if the voltage of the power grid can not be recovered to be normal within the time of allowing direct starting, but can be recovered to be normal within the time of allowing soft starting, the motor is started through the soft starting, and the motor is stopped due to instantaneous power failure of the power grid; if the grid voltage does not return to normal within the allowed time, the controller locks and does not start the equipment. The invention can be widely used for the restarting of motors controlled by a conventional alternating current contactor, the restarting of motors controlled by a star-delta starting loop or a voltage reduction starting loop, the restarting of motors controlled by DCS system participation, the restarting of motors controlled by DW series mechanical switches and the like, and the restarting of motors controlled by a frequency converter or a soft starter, and has the advantages of simple structure, high reliability, small volume, convenient installation and the like.