CN111524746A - Capacitor voltage-reducing cascade type multi-path branch control contactor circuit - Google Patents

Capacitor voltage-reducing cascade type multi-path branch control contactor circuit Download PDF

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Publication number
CN111524746A
CN111524746A CN202010375331.9A CN202010375331A CN111524746A CN 111524746 A CN111524746 A CN 111524746A CN 202010375331 A CN202010375331 A CN 202010375331A CN 111524746 A CN111524746 A CN 111524746A
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China
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diode
circuit
operational amplifier
anode
relay
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CN202010375331.9A
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Chinese (zh)
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介国安
吴辉
介玠
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Individual
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Individual
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/04—Single phase motors, e.g. capacitor motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/68—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more dc dynamo-electric motors

Abstract

The invention relates to a capacitor voltage-reducing cascade multi-path branch control contactor circuit, which is characterized in that a capacitor is subjected to voltage-reducing rectification and then is superposed and connected in series by a multi-path voltage-stabilizing power supply circuit and a multi-path relay control circuit, a plurality of optical coupling isolators respectively and correspondingly control a plurality of relay control circuits, the current passing through a capacitor voltage-reducing loop is reduced in multiple times, 3 high-current single-contact relays are respectively used for simultaneously attracting 1 group of relays to replace three-phase contacts of a three-phase alternating current contactor, or 2 groups of relays or a plurality of groups of relays are simultaneously attracted to increase the power to replace an alternating current contactor to control a motor, a unified reference signal source is adopted for a motor protection circuit, and a digital potentiometer is respectively adopted to set the overload current value and the underload current value, so that the circuit can be.

Description

Capacitor voltage-reducing cascade type multi-path branch control contactor circuit
Technical Field
The invention relates to the field of direct-current power supply and motor control, in particular to a capacitor voltage-reducing cascade multi-path branch control contactor circuit.
Background
In addition, in the capacitance voltage reduction voltage-stabilized power supply, if a large-capacity capacitor is required to be selected during multi-path relay control, the stabilized power supply also needs to select components with larger power, and the defects of large occupied space and high cost exist, and the defects that the alternating current contactor in a small-power control circuit is inconvenient to install on a circuit board, and the realization of an integrated circuit for intelligent protection control is unfavorable and the like exist. In addition, the motor protection is diversified, the circuits of some motor intelligent protectors are complex, expensive and not good in effect, and particularly the protection effect on the idle load protection of pumps cannot be achieved accurately.
Disclosure of Invention
The invention aims to provide a capacitor step-down cascade multi-path branch control contactor circuit which is invented according to the defects, wherein a capacitor is subjected to step-down rectification and then is superposed and connected in series by a multi-path voltage-stabilizing power circuit and a relay, and then is respectively controlled by a plurality of optical coupling isolators, so that the current passing through a capacitor step-down loop is reduced in multiple times, three large-current single-contact relays are respectively used for simultaneously acting to replace three-phase contacts of a three-phase alternating current contactor, and then a control circuit or a single chip microcomputer respectively controls the plurality of optical coupling isolators to achieve the control of forward rotation or reverse rotation of a; the motor protection circuit adopts a uniform reference signal source, and digital potentiometers are respectively adopted to set overload and underload current values, so that the circuit can be conveniently and accurately adjusted, and the motors and pumps can be accurately and reliably protected.
The invention has the technical scheme that a capacitor voltage reduction cascade series type multi-path branch control contactor circuit is characterized in that a capacitor voltage reduction rectifier is superposed and connected in series by a multi-path voltage stabilizing power supply circuit and a multi-path relay control circuit, a plurality of optical coupling isolators respectively and correspondingly control a plurality of relay control circuits to realize the multiple reduction of the current passing through a capacitor voltage reduction loop, 3 high-current single-contact relays are respectively used for simultaneously attracting 1 group of relays to replace three-phase contacts of a three-phase alternating current contactor, or 2 groups of relays or a plurality of groups of relays are simultaneously attracted to increase the power to replace an alternating current contactor to control a motor, an A alternating current power supply U and a C alternating current power supply W are respectively connected with a bridge rectifier consisting of a diode D1, a diode D2, a diode D3 and a diode D4 in a voltage reduction way, and the anode of the diode D3 and the anode of the diode D4, The cathode of the diode D1 and the cathode of the diode D2 are respectively connected with a circuit formed by two ends of a cascade-type multi-path voltage stabilizing diode DW1, an electrolytic capacitor C1, a voltage stabilizing diode DW2, an electrolytic capacitor C2, a voltage stabilizing diode DW3, an electrolytic capacitor C3, a voltage stabilizing diode DW3, an electrolytic capacitor Cn3, a voltage stabilizing diode Dwn3, an electrolytic capacitor Cn3, a voltage stabilizing diode 3 and an electrolytic capacitor Cn3, the cathode of the diode DW3 and the anode of the electrolytic capacitor C3 are connected with the anode of the voltage stabilizing diode DW3, the anode of the diode D3 and the anode of the diode D3 are connected with the anode of the voltage stabilizing diode DW3, the cathode of the electrolytic capacitor C3 is connected with the cathode of the electrolytic capacitor C3, the anode of the voltage stabilizing diode DW3 and the cathode of the electrolytic capacitor C3 are connected with the anode of the voltage stabilizing diode DW3 and the electrolytic capacitor C3 and the cathode of the electrolytic capacitor C3 are connected with the anode of the common terminal 3, The output of an emitter of the triode BG1 is a positive power supply V +, the cathode of the voltage stabilizing diode DW3 and the anode of the electrolytic capacitor C3 are connected with the anode of the voltage stabilizing diode DW4, the cathode of the electrolytic capacitor C4, the emitter of the triode BG2, the collector of the relay J1 and the opto-isolator G1, the emitter of the opto-isolator G1 controls the base of the triode BG1 to be a relay J1 control circuit through a resistor R1, the cathode of the voltage stabilizing diode DW4 and the anode of the electrolytic capacitor C4 are connected with the anode of the voltage stabilizing diode DW5, the cathode of the electrolytic capacitor C5, the emitter of the triode BG3, the collector of the relay J2 and the collector of the opto-isolator G2 through a resistor R2, the base of the triode BG2 is a relay J2 control circuit, the cathode of the voltage stabilizing diode BG2 and the anode of the electrolytic capacitor C2 are connected with the anode of the Cn2 of the voltage stabilizing diode 2 and the cathode of, An emitter of a triode BGn1, a collector of a relay J3 and an optical coupling isolator G3, an emitter of an optical coupling isolator G3 controls a base of a triode BG3 to be a control circuit of the relay J3 through a resistor R3, a cathode of a Zener diode DWn1 and an anode of an electrolytic capacitor Cn1 are connected with an anode of a Zener diode DWn2, a cathode of an electrolytic capacitor Cn2, an emitter of a triode BGn2, a cathode of a relay Jn1 and a collector of an optical coupling isolator Gn1, an emitter of the optical coupling isolator Gn1 controls a base of a triode BGn1 to be a control circuit of the relay Jn1 through a resistor Rn1, a cathode of the Zener diode 1 and an anode of the electrolytic capacitor Cn1 are connected with an anode of the Zener diode 1, a cathode of the electrolytic capacitor Cn1, an emitter of the triode BGn1, an emitter of the relay Jn1 and a collector of the optical coupling isolator Gn1 are controlled to be a control circuit of the triode Jn1 through a base of a BGn1, the negative pole of a voltage stabilizing diode DWn3 and the positive pole of an electrolytic capacitor Cn3 are connected with the collectors of a relay Jn3 and an optical coupling isolator Gn3, the optical coupling isolator G1, the optical coupling isolator G2, the optical coupling isolator G3, the optical coupling isolator Gn3 and the optical coupling isolator Gn3 respectively correspond to a control circuit for controlling a relay J3, a control circuit for a relay Jn3 and a control circuit for a relay Jn3, the emitter of the optical coupling isolator Gn3 controls the base of a triode BGn3 through a resistor Rn3 to be the control circuit for the relay Jn3, the optical coupling isolator G3, the optical coupling isolator Gn3, the optical coupling isolator G3, the positive pole of the optical coupling isolator Gn3 and the positive pole of the optical coupling isolator 3, the common optical coupling isolator 3 and the optical coupling isolator 3 are connected with the common optical coupling isolator 3V 3, The light emitting diode positive electrodes of the optical isolator Gn1, the optical isolator Gn1 and the optical isolator Gn1 are connected with the negative electrode of the diode D1 and the resistor R1, the other end of the resistor R1 is connected with the positive electrode of the diode D1, the negative electrode of the diode D1 and the resistor R1, the other end of the resistor R1 is connected with the output end of the operational amplifier I1, the negative electrode of the diode D1 is connected with the resistor R1, the other end of the resistor R1 is connected with the resistor R1, the negative electrode of the light emitting diode DG1 and the positive input end of the operational amplifier I1, the positive electrode of the diode D1 is connected with the other end of the resistor R1, the negative input end of the operational amplifier I1 is connected with the resistor R1, the negative electrode of the capacitor C1 and the positive electrode of the common resistor R1, and the positive electrode of the operational amplifier I1 are connected with the common power supply resistor R1. The other end of the resistor R51 is connected with the stop button TZ, the other end of the resistor R50 is connected with the start button QD, the other ends of the start button QD and the stop button TZ are connected with the positive power supply V +, the positive input end of the operational amplifier I16 is a positive signal when the start button QD is pressed down, the output end of the operational amplifier I16 is a positive signal, the optocoupler isolator is controlled to attract all relays, the relay contact of the main circuit is closed, the motor M1 operates, the negative input end of the operational amplifier I16 is a positive signal when the stop button TZ is pressed down, the output end of the operational amplifier I16 is a negative signal, the optocoupler isolator is controlled to disconnect all relays, the relay contact of the main circuit is disconnected, and the.
The circuit is characterized in that a main circuit, a signal amplification and three-phase unbalance protection circuit, a normally open contact of a relay J1, a normally open contact of a relay J2 and a normally open contact of a relay J3 of the main circuit are three-phase contacts of a 1 st group of relays which are simultaneously attracted to replace a three-phase alternating current contactor, or the normally open contact of the relay J4, the normally open contact of the relay J5 and the normally open contact of the relay J6 are simultaneously attracted to a 2 nd group of relays and a 1 st group of relays to increase power to replace the three-phase contacts of the three-phase alternating current contactor to control a motor M1, three-phase current signals measured by a current transformer L1, a current transformer L2 and a current transformer L3 are respectively amplified by an operational amplifier I1, an operational amplifier I2 and an operational amplifier I3, one path of the current is respectively amplified by a diode D6, a diode D8 and a diode D10 to obtain the maximum three-phase current value, meanwhile, the voltage is divided proportionally by R12 and R13 and is used as a reference value of three-phase unbalance protection to be respectively connected with the negative input ends of an operational amplifier I4, an operational amplifier I5 and an operational amplifier I6, the other path of the voltage enters a phase-failure and three-phase unbalance protection circuit through a diode D7, a diode D9 and a diode D11 to be connected with the positive input ends of the operational amplifier I4, the operational amplifier I5 and the operational amplifier I6, the three-phase unbalance is formed when the value of the voltage is less than the reference value of the negative input end, the phase failure also belongs to the three-phase unbalance, the operational amplifier I16 is controlled to stop the motor when the phase-failure and three-phase unbalance protection circuit occurs, the A-phase power supply V and the C-phase power supply W are respectively connected and pass through a contact of a relay J1, a contact of a relay J2 and a contact of a relay J8 to respectively penetrate through a current transformer L1, a current, one end of a secondary coil of the current transformer L1, one end of a secondary coil of the current transformer L1 and the other end of the secondary coil of the current transformer L1 are connected with a common terminal V1, the other end of the secondary coil of the current transformer L1 are respectively connected with positive input terminals of an operational amplifier I1, an operational amplifier I1 and the operational amplifier I1, output terminals of the operational amplifier I1, the operational amplifier I1 and the operational amplifier I1 are respectively connected with positive electrodes of a diode D1, a diode D1 and the diode D1, a negative electrode of the diode D1 is connected with a resistor R1, a potentiometer WR 1 and a positive electrode of an electrolytic capacitor C1, a negative electrode of the electrolytic capacitor is connected with the common terminal V1, the other end of the potentiometer WR 1 is connected with the common terminal V1, a sliding terminal of the potentiometer WR 1 is connected with a, the other end of the resistor R is connected with a common terminal V, the resistor R is connected with the resistor R and the negative input end of the operational amplifier I, the positive input end of the operational amplifier I is connected with the common terminal V, the output end of the operational amplifier I is connected with the other end of the resistor R and the resistor R, the negative electrode of the diode D is connected with the resistor R, the resistor R and the positive electrode of the electrolytic capacitor C, the negative electrode of the electrolytic capacitor C is connected with the common terminal V, the other end of the resistor R is connected with the positive input end of the operational amplifier I, the negative electrode of the diode D and the resistor R, the other end of the resistor R is connected with the positive electrode of the diode D, the negative electrode of the diode D is connected with the output end of the operational amplifier I and the negative electrode of the diode D, the positive electrode of the diode D is connected with the negative electrode of the light emitting diode DG, the other end of the resistor R18 is connected with the positive input end of the operational amplifier I5, the cathode of the diode D13 and the resistor R21, the other end of the resistor R21 is connected with the anode of the diode D16, the cathode of the diode D16 is connected with the output end of the operational amplifier I16 and the cathode of the diode D16, the anode of the diode D16 is connected with the cathode of the light emitting diode DG 16, the cathode of the diode D16 is connected with the resistor R16, the cathode of the electrolytic capacitor C16 is connected with the common terminal V16, the other end of the resistor R16 is connected with the positive input end of the operational amplifier I16, the cathode of the diode D16 and the resistor R16, the cathode of the resistor R16 is connected with the anode of the diode D16, the cathode of the diode D16 is connected with the output end of the operational amplifier I16 and the cathode of the diode D16, and the cathode of the diode D16 is connected with the anode of the LED D16, when the power supply U is cut-phase protection, when the phase of the B-phase power supply V is broken or the current is lower than the reference value of the three-phase unbalance protection, the light-emitting diode DG2 lights and stops, when the phase of the C-phase power supply W is broken or the current is lower than the reference value of the three-phase unbalance protection, the light-emitting diode DG3 lights and stops, when any light-emitting diode lights, the anode of the light-emitting diode is at a negative potential, the output end of the operational amplifier I16 is controlled to be at the negative potential, and the relay.
The capacitor voltage-reducing cascade type multi-path branch control contactor circuit is characterized in that a motor overload and underload protection circuit is used for pump no-load protection, a reference signal output by a reference signal source voltage-stabilizing diode DW6 is divided into two paths, one path is connected with the negative input end of an operational amplifier I13 of the overload protection circuit, the other path is connected with the negative input end of an operational amplifier I13 of the underload protection circuit through a resistor R36, when a current signal output by a motor working current signal through a rated current value set by a three-position digital potentiometer RW2 exceeds the reference signal, the motor M1 is subjected to overload protection and shutdown through an inverse time-limit circuit, when a current signal output by the underload current set by the three-position digital potentiometer RW1 of the motor is smaller than the reference signal, the motor M1 is subjected to underload protection and shutdown, and when the underload protection is used for pump no-load protection and needs to be started and, the negative electrode of a reference signal source voltage stabilizing diode DW6 is connected with the voltage stabilizing adjustment end of a reference signal source voltage stabilizing diode DW6, a resistor R26, a resistor R28, a resistor R36 and the negative input end of an operational amplifier I13, the other end of a resistor R26 is connected with a positive power supply V +, the positive electrode of a reference signal source voltage stabilizing diode DW6 is connected with a common end V0, the other end of the resistor R28 is connected with a resistor R29 and the negative input end of an operational amplifier I8, the other end of the resistor R29 is connected with a common end V29, the output end of the operational amplifier I29 is connected with the negative electrode of a diode D29, the negative electrode of a diode D29 and the positive electrode of an electrolytic capacitor C29, the negative electrode of the electrolytic capacitor C29 is connected with the positive electrode of the diode D29, a potentiometer RW 29 and the negative input end of the operational amplifier I29, the other end of the potentiometer 29 is connected with a common end V29, the other end of the resistor R32 is connected with a common terminal V0, the output end of the operational amplifier I9 is connected with the cathode of a diode D24, the anode of the diode D24 is connected with the anode of an electrolytic capacitor C24 and a resistor R24, the other end of the resistor R24 and the other end of the resistor R24 are connected with the anode of a diode D24, the cathode of the diode D24 and the negative input end of the operational amplifier I24, the anode of the diode D24 is connected with the common terminal V24, the positive input end of the operational amplifier I24 is connected with the resistor R24 and the cathode of the diode R24, the other end of the resistor R24 is connected with the anode of the diode D24, the cathode of the diode D24 is connected with the output end of the operational amplifier I24 and the cathode of the diode D24, the anode of the diode D24 is connected with the cathode of the light-emitting diode DG 24, the other end of the resistor R24 is connected with the negative input end of the operational amplifier I24 and the three-position digital potentiometer, and, A resistor R37 and the other end of the three-position digital potentiometer RW2, a resistor R27 is connected with the positive input terminal of the operational amplifier I8, the other end of the resistor R37 is connected with the negative input terminals of the resistor R38, the resistor R39 and the operational amplifier I39, the output terminal of the operational amplifier I39 is connected with the negative electrodes of the resistor R39 and the diode D39, the other end of the resistor R39 is connected with the negative electrode of the diode D39, the positive electrode of the electrolytic capacitor C39, the negative input terminal of the operational amplifier I39 and the negative input terminal of the operational amplifier I39, the positive input terminal of the operational amplifier I39 is connected with the negative electrodes of the resistor R39, the resistor R39 and the diode D39, the other end of the resistor R39 is connected with the positive power source V +, the other end of the resistor R39 is connected with the positive electrode of the diode D39, and the negative electrode of the operational amplifier I39 is connected with the output terminal of the diode D39. The cathode of the diode D36, the anode of the diode D36 is connected with the cathode of the light emitting diode DG4, the other end of the resistor R39 is connected with the anode of the diode D30, the cathode of the diode D30 is connected with the anode of the diode D31, the other end of the resistor R38 is connected with the common terminal V0, the cathode of the diode D32 is connected with the positive power supply V +, the cathode of the electrolytic capacitor C14 is connected with the common terminal V0, the positive input terminal of the operational amplifier I14 is connected with the common terminal V0, one end of the reset button FW is connected with the positive power supply V + and the anode of the electrolytic capacitor C10, the cathode of the electrolytic capacitor C10 is connected with the anode of the diode D37 and the resistor R25, the other end of the resistor R25 is connected with the negative power supply V-, the other end of the reset button FW is connected with the cathode of the diode D25, the anode of the diode D25, the, after the shutdown, the circuit can be restarted by pressing a reset button FW to restore the circuit to the original state.
The invention relates to a capacitor voltage-reducing cascade multi-path branch control contactor circuit, which is characterized in that a capacitor is subjected to voltage-reducing rectification and then is superposed and connected in series by a multi-path voltage-stabilizing power supply circuit and a multi-path relay control circuit, a plurality of optical coupling isolators respectively and correspondingly control a plurality of relay control circuits, the current passing through a capacitor voltage-reducing loop is reduced in multiple times, 3 high-current single-contact relays are respectively used for simultaneously attracting 1 group of relays to replace three-phase contacts of a three-phase alternating current contactor, or 2 groups of relays or a plurality of groups of relays are simultaneously attracted to increase the power to replace an alternating current contactor to control a motor, a unified reference signal source is adopted for a motor protection circuit, and a digital potentiometer is respectively adopted to set the overload current value and the underload current value, so that the circuit can be.
Drawings
In the figure 1, a UA phase power supply, a VB phase power supply, a WC phase power supply, R1-R53 resistors, Rn1-Rn3 resistors, RW1-RW2 three-bit digital potentiometers, RW3-RW4 potentiometers, C01-C02 capacitors, C1-C15 electrolytic capacitors, D1-D42 diodes, DG1-DG5 light-emitting diodes, DW1-DW5 voltage stabilizing diodes, DW6 reference signal source voltage stabilizing diodes, DWn1-DWn3 voltage stabilizing diodes, BG1-BG3 triodes, the system comprises a BGn1-BGn3 triode, a G1-G3 optical coupling isolator, a Gn1-Gn3 optical coupling isolator, a J1-J3 relay, a Jn1-Jn3 relay, an M1 motor, an L1-L3 current transformer, an I1-I16 operational amplifier, a QD start button, a TZ stop button, a FW reset button, an SZB 3 potential digital display, a V + positive power supply, a V-negative power supply and a V0 public terminal.
Detailed Description
FIG. 1 is a circuit of a capacitor step-down cascade multi-path branch control contactor, which is characterized in that a capacitor is subjected to step-down rectification and then is superposed and connected in series by a multi-path voltage-stabilizing power supply circuit and a multi-path relay control circuit, and then a plurality of optical coupling isolators respectively and correspondingly control a plurality of relay control circuits, so that the current passing through a capacitor step-down loop is reduced in multiple times, 3 large-current single-contact relays are respectively used for simultaneously attracting 1 group of relays to replace three-phase contacts of a three-phase alternating current contactor, or 2 groups of relays or a plurality of groups of relays are simultaneously attracted to increase the power to replace the alternating current; a AC power supply U and C AC power supply W are respectively connected with a bridge rectifier consisting of a diode D1, a diode D2, a diode D3 and a diode D4 through a capacitor C01, a resistor R04, a capacitor C02 and a resistor R05 in a voltage reduction manner, the anode of the diode D3 and the anode of the diode D4, the cathode of the diode D1 and the cathode of the diode D2 are respectively connected with a cascade multi-path voltage-stabilized power supply consisting of a voltage stabilizing diode DW1, an electrolytic capacitor C1, a voltage stabilizing diode DW2, an electrolytic capacitor C2, a voltage stabilizing diode DW3, an electrolytic capacitor C3, a voltage stabilizing diode DW4, an electrolytic capacitor C4, a voltage stabilizing diode DW5, an electrolytic capacitor C5, a voltage stabilizing diode DWn1, an electrolytic capacitor 1, a voltage stabilizing diode Dwn2, an electrolytic capacitor Cn2, a voltage stabilizing diode DWn3 and an electrolytic capacitor Cn3, and a loop is formed by two ends of; when the starting button QD is pressed down, the positive input end of the operational amplifier I16 is a positive signal, the output end of the operational amplifier I16 is a positive signal, the optical coupler isolator is controlled to enable all relays to be attracted, the relay contact of the main circuit is closed, the motor M1 operates, when the stopping button TZ is pressed down, the negative input end of the operational amplifier I16 is a positive signal, the output end of the operational amplifier I16 is a negative signal, the optical coupler isolator is controlled to enable all relays to be disconnected, the relay contact of the main circuit is disconnected, and the motor M1 stops; the normally open contact of the main circuit relay J1, the normally open contact of the relay J2 and the normally open contact of the relay J3 are three-phase contacts of a 1 st group of relays which are simultaneously attracted to replace a three-phase alternating current contactor, or the normally open contact of the relay J4, the normally open contact of the relay J5 and the normally open contact of the relay J6 are three-phase contacts of a 2 nd group of relays which are simultaneously attracted to increase power to replace the three-phase alternating current contactor, so that the motor M1 is controlled, three-phase current signals measured by the current transformer L1, the current transformer L2 and the current transformer L3 are respectively amplified by the operational amplifier I1, the operational amplifier I2 and the operational amplifier I3, one path of the three-phase current signals is respectively amplified by the diode D6, the diode D8 and the diode D10 to obtain the maximum three-phase current value of one phase to remove an overload and underload protection circuit, and the three-phase current signals are respectively connected, The negative input ends of an operational amplifier I5 and an operational amplifier I6, the other circuit respectively enters a phase-failure and three-phase imbalance protection circuit through a diode D7, a diode D9 and a diode D11 to be connected with the positive input ends of the operational amplifier I4, the operational amplifier I5 and an operational amplifier I6, when the numerical value is less than the reference value of the negative input end, the three-phase imbalance is formed, the operational amplifier I16 is controlled to stop the motor when the phase-failure and three-phase imbalance protection circuit occurs, a light emitting diode DG1 is lightened and stopped when the phase-failure or the current of an A-phase power supply U is less than the reference value of the three-phase imbalance protection, a light emitting diode DG2 is lightened and stopped when the phase-failure or the current of a B-phase power supply V is less than the reference value of the three-phase imbalance protection, a light emitting diode DG3 is lightened and stopped when the phase-failure or the current of a C, controlling the output end of the operational amplifier I16 to be negative potential, and disconnecting the relay to stop the motor; the underload protection is used for the no-load protection of pumps, a reference signal output by a reference signal source voltage stabilizing diode DW6 is divided into two paths, one path is connected with the negative input end of an operational amplifier I13 of an overload protection circuit, the other path is connected with the negative input end of an operational amplifier I13 of the underload protection circuit through a resistor R36, when a current signal output by an underload current signal through a rated current value set by a three-position digital potentiometer RW2 exceeds the reference signal, the motor M1 is subjected to overload protection and stopped through an inverse time circuit, when the current signal output by the underload current set by the three-position digital potentiometer RW1 of the motor is smaller than the reference signal, the motor M1 is subjected to the underload protection and stopped, when the underload protection is used for the no-load protection of pumps, a reset button FW is pressed after the fault and the circuit is restored to the original state and can.
The specific implementation mode is that a circuit board is manufactured according to a circuit diagram 1 of a capacitance step-down cascade series type multipath shunt control contactor, the anode of a diode D3 and the anode of a diode D4 are connected with the anode of a voltage stabilizing diode DW1, the cathode output of an electrolytic capacitor C1 is a negative power supply V-, the cathode of a voltage stabilizing diode DW1 and the anode of an electrolytic capacitor C1 are connected with the anode of a voltage stabilizing diode DW2 and the cathode output of an electrolytic capacitor C2 are a common end V0, the cathode of a voltage stabilizing diode DW2 and the anode of an electrolytic capacitor C2 are connected with the anode of a voltage stabilizing diode DW3 and the cathode of an electrolytic capacitor C3, the emitter output of a triode BG1 is a positive power supply V +, the cathode of a voltage stabilizing diode DW3 and the anode of an electrolytic capacitor C3 are connected with the anode of a voltage stabilizing diode DW4, the cathode of an electrolytic capacitor C4, the emitter of a triode BG2, an emitter of a relay J1 and an opto-coupler isolator G1, the emitter of an, the cathode of the voltage stabilizing diode DW4 and the anode of the electrolytic capacitor C4 are connected with the anode of the voltage stabilizing diode DW5, the cathode of the electrolytic capacitor C5, the emitter of the transistor BG3, the cathode of the relay J2 and the collector of the opto-isolator G2, the emitter of the opto-isolator G2 controls the base of the transistor BG2 through a resistor R2, the cathode of the voltage stabilizing diode DW2 and the anode of the electrolytic capacitor C2 are connected with the anode of the voltage stabilizing diode 2, the cathode of the electrolytic capacitor Cn2, the emitter of the transistor BGn2, the cathode of the relay J2 and the collector of the opto-isolator G2, the emitter of the transistor BGn2 controls the base of the transistor BG2 through a resistor R2, the cathode of the voltage stabilizing diode 2 and the anode of the electrolytic capacitor Cn2 are connected with the anode of the diode 2, the cathode of the electrolytic capacitor Cn2, the cathode of the transistor BGn2 controls the emitter of the transistor BGn2 and the collector of the emitter of the opto-isolator G, the cathode of the voltage stabilizing diode DWn2 and the anode of the electrolytic capacitor Cn DWn2 are connected with the anode of the voltage stabilizing diode DWn2, the cathode of the electrolytic capacitor Cn DWn2, the emitter of the transistor BGn DWn2, the collector of the relay Jn DWn2 and the light coupling isolator Gn DWn2, the emitter of the light coupling isolator Gn DWn2 controls the base of the transistor BGn DWn2 through the resistor Rn DWn2, the cathode of the voltage stabilizing diode DWn2 and the anode of the electrolytic capacitor Cn DWn2 are connected with the collector of the relay Jn DWn2 and the light coupling isolator Gn DWn2, the emitter of the light coupling isolator Gn DWn2 controls the base of the transistor BGn DWn2 through the resistor Rn DWn2, the anodes of the light emitting diodes of the light coupling isolator Gn DWn2, the light coupling isolator G DWn2, the light coupling isolator Gn DWn2, the light coupling Gn DWn2, the anode of the light coupling isolator Gn DWn2 and the anode of the diode D DWn2 are connected with the common terminal V DWn2, the cathode of the light coupling isolator DWn2, the light coupling isolator DWn2 and the anode of the light coupling diode 36R DWn2 and the light coupling diode 36R DWn2, the other end of the resistor R45 is connected with the anode of the diode D38, the cathode of the diode D40 and the resistor R53, the other end of the resistor R53 is connected with the output end of the operational amplifier I16, the cathode of the diode D38 is connected with the resistor R46, the other end of the resistor R46 is connected with the resistors R47, R49, R50 and the cathode of the light-emitting diode DG1, the negative electrode of the light emitting diode DG2, the negative electrode of the light emitting diode DG3, the negative electrode of the light emitting diode DG4, the negative electrode of the light emitting diode DG5 and the positive input end of an operational amplifier I16, the positive electrode of a diode D40 is connected with the other end of a resistor R47, the negative input end of the operational amplifier I16 is connected with a resistor R48, a resistor R51 and the negative electrode of a capacitor C15, the positive electrode of the capacitor C15 is connected with a positive power supply V +, the other ends of the resistor R49 and the resistor R48 are connected with a common end V0, the other end of the resistor R51 is connected with a stop button TZ, the other end of the resistor R50 is connected with a start button QD; an A-phase power supply U, B, a C-phase power supply V and a C-phase power supply W are respectively connected with a contact of a relay J U, B, a contact of the relay J U, B and then respectively penetrate through a current transformer L U, B, a current transformer L U, B and the current transformer L U, B to be connected with a motor M U, B, one end of a secondary coil of the current transformer L U, B, the current transformer L U, B and the current transformer L U, B is connected with a common terminal V U, B, the other end of the secondary coil of the current transformer L U, B is respectively connected with positive input terminals of an operational amplifier I U, B, the operational amplifier I U, B and the operational amplifier I U, B, output terminals of the operational amplifier I U, B, the operational amplifier I U, B and the operational amplifier I U, B are respectively connected with a cathode of a diode D U, B, a cathode of the diode D U, B, a resistor R U, B, a potentiometer U, B and an anode, the other end of the potentiometer WR is connected with a common terminal V, the sliding end of the potentiometer WR is connected with a 3-bit digital display SZB, the other end of the resistor R is connected with an operational amplifier I, the negative input end of the operational amplifier I and a resistor R, the other end of the resistor R is connected with the common terminal V, the resistor R is connected with the negative input end of the operational amplifier I, the positive input end of the operational amplifier I is connected with the common terminal V, the output end of the operational amplifier I is connected with the other end of the resistor R and the resistor R, the negative electrode of the diode D is connected with the resistor R, the resistor R and the anode of an electrolytic capacitor C, the negative electrode of the electrolytic capacitor C is connected with the common terminal V, the other end of the resistor R is connected with the positive input end of the operational amplifier I, the negative electrode of the diode D and the resistor R, the other end of the resistor R is, the anode of the diode D18 is connected to the cathode of the diode DG 18, the cathode of the diode D18 is connected to the resistors R18, R18 and the anode of the electrolytic capacitor C18, the cathode of the electrolytic capacitor C18 is connected to the common terminal V18, the other end of the resistor R18 is connected to the positive input terminal of the operational amplifier I18, the cathode of the diode D18 and the resistor R18, the other end of the resistor R18 is connected to the anode of the diode D18, the cathode of the diode D18 is connected to the output terminal of the operational amplifier I18 and the cathode of the diode D18, the anode of the diode D18 is connected to the cathode of the diode DG 18, the cathode of the diode D18 is connected to the resistors R18, the cathode of the electrolytic capacitor C18 is connected to the common terminal V18, the other end of the resistor R18 is connected to the positive input terminal of the operational amplifier I18, the cathode of the diode D18 and the anode of the resistor R18 are connected to the diode D36, the 7 negative electrode of the diode D1 is connected with the output end of the operational amplifier I6 and the negative electrode of the diode D20, and the positive electrode of the diode D20 is connected with the negative electrode of the light-emitting diode DG 3; the negative electrode of a reference signal source voltage stabilizing diode DW6 is connected with the voltage stabilizing adjustment end of a reference signal source voltage stabilizing diode DW6, a resistor R26, a resistor R28, a resistor R36 and the negative input end of an operational amplifier I13, the other end of a resistor R26 is connected with a positive power supply V +, the positive electrode of a reference signal source voltage stabilizing diode DW6 is connected with a common end V0, the other end of the resistor R28 is connected with a resistor R29 and the negative input end of an operational amplifier I8, the other end of the resistor R29 is connected with a common end V29, the output end of the operational amplifier I29 is connected with the negative electrode of a diode D29, the negative electrode of a diode D29 and the positive electrode of an electrolytic capacitor C29, the negative electrode of the electrolytic capacitor C29 is connected with the positive electrode of the diode D29, a potentiometer RW 29 and the negative input end of the operational amplifier I29, the other end of the potentiometer 29 is connected with a common end V29, the other end of the resistor R32 is connected with a common terminal V0, the output end of the operational amplifier I9 is connected with the cathode of a diode D24, the anode of the diode D24 is connected with the anode of an electrolytic capacitor C24 and a resistor R24, the other end of the resistor R24 and the other end of the resistor R24 are connected with the anode of a diode D24, the cathode of the diode D24 and the negative input end of the operational amplifier I24, the anode of the diode D24 is connected with the common terminal V24, the positive input end of the operational amplifier I24 is connected with the resistor R24 and the cathode of the diode R24, the other end of the resistor R24 is connected with the anode of the diode D24, the cathode of the diode D24 is connected with the output end of the operational amplifier I24 and the cathode of the diode D24, the anode of the diode D24 is connected with the cathode of the light-emitting diode DG 24, the other end of the resistor R24 is connected with the negative input end of the operational amplifier I24 and the three-position digital potentiometer, and, A resistor R37 and the other end of the three-position digital potentiometer RW2, a resistor R27 is connected with the positive input terminal of the operational amplifier I8, the other end of the resistor R37 is connected with the negative input terminals of the resistor R38, the resistor R39 and the operational amplifier I39, the output terminal of the operational amplifier I39 is connected with the negative electrodes of the resistor R39 and the diode D39, the other end of the resistor R39 is connected with the negative electrode of the diode D39, the positive electrode of the electrolytic capacitor C39, the negative input terminal of the operational amplifier I39 and the negative input terminal of the operational amplifier I39, the positive input terminal of the operational amplifier I39 is connected with the negative electrodes of the resistor R39, the resistor R39 and the diode D39, the other end of the resistor R39 is connected with the positive power source V +, the other end of the resistor R39 is connected with the positive electrode of the diode D39, and the negative electrode of the operational amplifier I39 is connected with the output terminal of the diode D39. The cathode of the diode D36, the anode of the diode D36 is connected with the cathode of the light emitting diode DG4, the other end of the resistor R39 is connected with the anode of the diode D30, the cathode of the diode D30 is connected with the anode of the diode D31, the other end of the resistor R38 is connected with the common terminal V0, the cathode of the diode D32 is connected with the positive power supply V +, the cathode of the electrolytic capacitor C14 is connected with the common terminal V0, the positive input terminal of the operational amplifier I14 is connected with the common terminal V0, one end of the reset button FW is connected with the positive power supply V + and the anode of the electrolytic capacitor C10, the cathode of the electrolytic capacitor C10 is connected with the anode of the diode D37 and the resistor R25, the other end of the resistor R25 is connected with the negative power supply V-, the other end of the reset button FW is connected with the cathode of the diode D25, the anode of the diode D25, the, after the shutdown, the circuit can be restarted by pressing a reset button FW to restore the circuit to the original state.

Claims (3)

1. A capacitor voltage reduction cascade multi-path branch control contactor circuit is characterized in that a capacitor is subjected to voltage reduction and rectification and then is superposed and connected in series by a multi-path stabilized voltage supply circuit and a multi-path relay control circuit, a plurality of optical couplers respectively correspondingly control a plurality of relay control circuits to realize the multiple reduction of current passing through a capacitor voltage reduction loop, 3 high-current single-contact relays are respectively used for simultaneously attracting 1 group of relays to replace three-phase contacts of a three-phase alternating current contactor, or 2 groups of relays or a plurality of groups of relays are used for simultaneously attracting to increase power to replace an alternating current contactor to control a motor, an A alternating current power supply (U) and a C alternating current power supply (W) are respectively subjected to voltage reduction through a capacitor (C01), a resistor (R04), a capacitor (C02) and a resistor (R25) and are respectively subjected to voltage reduction and are connected with a bridge rectification consisting of a diode (D59 1), a diode (D, the anode of the diode (D3) and the anode of the diode (D4), the cathode of the diode (D1) and the cathode of the diode (D2) are respectively connected with a circuit formed by two ends of a cascade-type multipath composed of a voltage stabilizing diode (DW1), an electrolytic capacitor (C1), a voltage stabilizing diode (DW2), an electrolytic capacitor (C2), a voltage stabilizing diode (DW3), an electrolytic capacitor (C3), a voltage stabilizing diode (DW4), an electrolytic capacitor (C4), a voltage stabilizing diode (DW5), an electrolytic capacitor (C5), a voltage stabilizing diode (DWn1), an electrolytic capacitor (Cn1), a voltage stabilizing diode (Dwn2), an electrolytic capacitor (Ch2), a voltage stabilizing diode (DWn3) and an electrolytic capacitor (DW3), the anode of the diode (D3) and the anode of the diode (D4) are connected with the anode of the voltage stabilizing diode (1), the cathode of the electrolytic capacitor (C1) is output of a negative power source (V-), the cathode of a voltage stabilizing diode (DW1) and the anode of an electrolytic capacitor (C1) are connected with the anode of a voltage stabilizing diode (DW2) and the cathode of an electrolytic capacitor (C2) to form a common end (V0), the cathode of the voltage stabilizing diode (DW2) and the anode of the electrolytic capacitor (C2) are connected with the anode of a voltage stabilizing diode (DW3) and the cathode of the electrolytic capacitor (C3), the emitter output of a triode (BG1) is a positive power supply (V +), the cathode of the voltage stabilizing diode (DW3) and the anode of the electrolytic capacitor (C3) are connected with the anode of a voltage stabilizing diode (DW4), the cathode of an electrolytic capacitor (C4), the emitter of a triode (BG2), the collector of a relay (J1) and an optocoupler isolator (G1), the emitter of the isolator (G1) controls the base of the triode (BG1) to be a relay (J1) control circuit through a resistor (R1), and the optocoupler (G1) and the, An optical coupling isolator (G2), an optical coupling isolator (G3), an optical coupling isolator (Gn1), an optical coupling isolator (Gn2), an optical coupling isolator (Gn3) respectively corresponds to a control relay (J1) control circuit, a relay (J2) control circuit, a relay (J3) control circuit, a relay (Jn1) control circuit, a relay (Jn2) control circuit, a relay (Jn3) control circuit, an optical coupling isolator (G1), an optical coupling isolator (G2), an optical coupling isolator (G3), an optical coupling isolator (Gn1), an optical coupling isolator (Gn2), a negative pole of a light emitting diode of the optical coupling isolator (Gn 637) and a positive pole of a diode (D42) are connected with a common terminal (V0), the optical coupling isolator (G0), the optical coupling isolator (Gn 0) and a positive pole of the optical coupling isolator (Gn 0) are connected with a light emitting diode (Gn 0) and a positive pole of the optical coupling isolator (Gn 0) and a light emitting diode 0) are connected with a light emitting diode 0, when the starting button (QD) is pressed down, the positive input end of the operational amplifier (I16) is a positive signal, the output end of the operational amplifier (I16) is a positive signal, the optical coupler isolator is controlled to enable all relays to be attracted, the relay contact of the main circuit is closed, the motor (M1) operates, when the stopping button (TZ) is pressed down, the negative input end of the operational amplifier (I16) is a positive signal, the output end of the operational amplifier (I16) is a negative signal, the optical coupler isolator is controlled to enable all relays to be disconnected, the relay contact of the main circuit is disconnected, and the motor (M1) stops.
2. The circuit of claim 1, wherein the main circuit and the signal amplifying and three-phase imbalance protection circuit, the normally open contact of the relay (J1), the normally open contact of the relay (J2) and the normally open contact of the relay (J3) of the main circuit are the 1 st group of relays which are simultaneously attracted to replace the three-phase contacts of the three-phase AC contactor, or the normally open contact of the relay (J4), the normally open contact of the relay (J5) and the normally open contact of the relay (J6) are simultaneously attracted to increase the power of the 2 nd group of relays and the 1 st group of relays to replace the three-phase contacts of the three-phase AC contactor to control the motor (M1), the three-phase current signals measured by the current transformer (L1), the current transformer (L2) and the current transformer (L3) are respectively amplified by the operational amplifier (I1), the operational amplifier (I2) and the operational amplifier (I3), one path of the circuit is used for taking the maximum current value of one phase of three phases through a diode (D6), a diode (D8) and a diode (D10) respectively to remove overload and underload protection circuits, meanwhile, the circuit is used as a reference value of three-phase unbalance protection by dividing voltage proportionally through a diode (R12) and a diode (R13) and is respectively connected with the negative input ends of an operational amplifier (I4), an operational amplifier (I5) and an operational amplifier (I6), the other path of the circuit enters the open-phase and three-phase unbalance protection circuit through a diode (D7), a diode (D9) and a diode (D11) respectively and is connected with the positive input ends of the operational amplifier (I4), the operational amplifier (I5) and the operational amplifier (I6), the numerical value of the circuit is three-phase unbalance when the numerical value of the circuit is less than the reference value of the negative input end, the open phase also belongs to three-phase unbalance, the three-phase unbalance protection circuit is used for controlling the operational amplifier (I16) to stop the motor when the When the phase of the B-phase power supply (V) is broken or the current is lower than the reference value of the three-phase unbalance protection, the light emitting diode (DG2) is turned on and stops, when the phase of the C-phase power supply (W) is broken or the current is lower than the reference value of the three-phase unbalance protection, the light emitting diode (DG3) is turned on and stops, the positive electrode of any light emitting diode is at a negative potential, the output end of the operational amplifier (I16) is controlled to be at the negative potential, and the relay is turned off to stop the.
3. The capacitor voltage-reducing cascade type multi-path branch control contactor circuit according to claim 1, wherein the motor overload and underload protection circuit is used for pump class no-load protection, the reference signal output by the reference signal source voltage-stabilizing diode (DW6) is divided into two paths, one path is connected with the negative input end of the operational amplifier (I13) of the overload protection circuit, the other path is connected with the negative input end of the operational amplifier (I13) of the underload protection circuit through a resistor (R36), the motor (M1) is subjected to overload protection and shut down when the current signal output by the motor working current signal passing through the rated current value set by the three-position digital potentiometer (RW2) exceeds the reference signal and is delayed by an inverse time-limit circuit, the motor (M1) is subjected to underload protection and shut down when the current signal output by the underload current set by the three-position digital potentiometer (RW1) is smaller than the reference signal, when the underload protection is used for starting avoidance during the no-load protection of pumps, the other end of a reset button (FW) is connected with the cathode of a diode (D37), the anode of a diode (D12), the anode of a diode (D13), the anode of a diode (D14), the anode of a diode (D34), the anode of a diode (D41) and the cathode of a diode (D28) are connected with the other end of a resistor (R41), and the reset button (FW) is pressed after the fault shutdown to restore the original state of the circuit so as to restart the circuit.
CN202010375331.9A 2020-04-21 2020-04-21 Capacitor voltage-reducing cascade type multi-path branch control contactor circuit Pending CN111524746A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111508774A (en) * 2020-04-21 2020-08-07 介国安 Capacitor voltage-reducing cascade type multi-path intelligent sub-control contactor
CN112670954A (en) * 2020-12-16 2021-04-16 工泰电器有限公司 Local integrated small-sized integrated motor intelligent universal protection controller

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111508774A (en) * 2020-04-21 2020-08-07 介国安 Capacitor voltage-reducing cascade type multi-path intelligent sub-control contactor
CN111508774B (en) * 2020-04-21 2022-11-25 介国安 Capacitor voltage-reducing cascade type multi-path intelligent sub-control contactor
CN112670954A (en) * 2020-12-16 2021-04-16 工泰电器有限公司 Local integrated small-sized integrated motor intelligent universal protection controller
CN112670954B (en) * 2020-12-16 2023-06-20 工泰电器有限公司 Intelligent universal protection controller for local integrated small-sized integrated motor

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