CN2208283Y - Five function electronic protector for sigle phase motor - Google Patents

Abstract

The utility model discloses a five function electronic protector for a single phase motor, which comprises an outer shell and a machine core circuit, wherein, a control button and an indicating lamp are arranged on the outer shell, and the both sides are provided with lead-in and lead-out jacks. The machine core circuit comprises ten element circuits, and the protection functions of the excess voltage, the excess voltage, the locked rotor, the overload, the electrical leakage, etc. of the single phase motor can be realized. The five function electronic protector for a single phase motor has the advantages of high sensitivity, good reliability and low cost. The utility model is the ideal protection device for the single phase motor.

Description

Five function electronic protector for sigle phase motor

The utility model relates to a kind of monophase machine five-function electronic protector.

For a long time, for protections such as the superpressure that realizes motor, under-voltage, stall, overload, electric leakages, must use many equipment such as superpressure relay, under-voltage relay, current transformer, thermal relay, the time relay, fuse, earth leakage protective device.These equipment volume are big, and power consumption is big, function singleness, and the more use monophase machine in rural area drew water drought resisting and harvest season in every year, and a lot of motors burn out because of under-voltage or stall, overload, because of also happening occasionally of people killed in electric leakage.

The purpose of this utility model promptly is to overcome the shortcoming of prior art, and a kind of monophase machine five-function electronic protector is provided, and has multiple function; finish superpressure, stall, overload, electric leakage, under-voltage protection, volume is little, and price is low; highly sensitive, protection range is wide and adjustable, and adaptability is strong.

For achieving the above object; scheme of the present utility model is: monophase machine five-function electronic protector; form by movement circuit and shell; movement circuit is corresponding continuous with each element on the shell by lead; the front of shell is equipped with the earth leakage protective test button; Fast starting button, superpressure indicator light, under-voltage indicator light, stall indicator light, overload indicator light, electric leakage indicator light, the both sides of shell are respectively equipped with the inlet wire jack and go out line jack.Movement circuit comprises ten element circuits; it is power circuit; voltage protection circuit; relay promotes circuit; the rotation-clogging protection circuit; the diode OR gate circuit; relay circuit; the overload protection circuit; leakage protection circuit; the Fast starting circuit; starting delay circuit; power circuit connects each element circuit; the output of voltage protection circuit promotes circuit with relay and links to each other; link to each other with relay circuit again; the output termination diode OR gate circuit of rotation-clogging protection circuit; connect relay again and promote circuit; the overload circuit output end links to each other with the diode OR gate circuit; the output of leakage protection circuit also links to each other with the diode OR gate circuit; the Fast starting circuit output end connects relay and promotes circuit, and the starting delay circuit output also connects relay and promotes circuit.

Fig. 1 is the outside drawing of monophase machine five-function electronic protector.

Fig. 2 is the circuit block diagram of monophase machine five-function electronic protector.

Fig. 3 is the circuit theory diagrams of monophase machine five-function electronic protector.

The utility model will be further described below in conjunction with accompanying drawing

As shown in Figure 1; the outer casing frontispiece of monophase machine five-function electronic protector is provided with earth leakage protective test button 1; Fast starting button 2; superpressure indicator light 3; under-voltage indicator light 4, stall indicator light 5, overload indicator light 6; electric leakage indicator light 7, the both sides of shell are respectively equipped with inlet wire jack 8 and go out line jack 9.

As shown in Figure 2; the movement circuit of monophase machine five-function electronic protector comprises ten element circuits, and promptly power circuit, voltage protection circuit, relay promote circuit, rotation-clogging protection circuit, diode OR gate circuit, relay circuit, overload protection circuit, leakage protection circuit, Fast starting circuit, starting delay circuit.Power circuit connects each element circuit; for each element circuit provides power supply; the output of voltage protection circuit promotes circuit with relay and links to each other; link to each other with relay circuit again; the output termination diode OR gate circuit of rotation-clogging protection circuit; connect relay again and promote circuit; the overload protection circuit output end links to each other with the diode OR gate circuit; the output of leakage protection circuit also links to each other with the diode OR gate circuit; the Fast starting circuit output end connects relay and promotes circuit, and the starting delay circuit output also connects relay and promotes circuit.

As shown in Figure 3, power circuit is by B ₁, D _1-4, C ₁, IC7812, C ₂Form, power circuit connects external power, and the alternating current of external power is after transformation, rectification, filtering, voltage stabilizing, and output 19V and two groups of DC power supply of 12V are supplied with relay respectively and promoted circuit and various protective circuit.

Voltage protection circuit comprises that the superpressure signal amplifies indicating circuit, by Q ₁, D ₉, R ₁, R ₃, R ₅Deng composition, superpressure signal phase inverter is by Q ₃, R ₁, R ₄Form; The voltage protection circuits for triggering are by Q ₄, R ₂Form; Voltage sample circuit is by B ₂, D _5-8, C ₃, W ₁, W ₂, C ₄Deng composition; Under-voltage signal amplifies indicating circuit, by Q ₂, R ₂, R ₃, R ₄, D ₁₀Form; Voltage sample circuit under normal circumstances, C ₄On the 6V direct voltage is arranged, this voltage approximates Q ₁And Q ₂Emitter voltage, therefore two Guan Jun are in anti-cut-off state partially, in case supply voltage rises or descends C ₄On will occur one with respect to the positive of former 6V voltage or negative superpressure or under-voltage signal, deliver to Q respectively ₁Or Q ₂Amplify.The superpressure signal amplifies indicating circuit, under normal circumstances, and Q ₁End D ₉Not luminous, in case the output of superpressure signal, Q are arranged on the voltage sample circuit C4 ₁With regard to conducting, D ₉Little bright, instructed voltage is higher, if this signal continues to increase, and when having surpassed rated value, Q ₁Just enter saturation conduction, D ₉Incandescent, R ₁On voltage drop surge, cause superpressure signal phase inverter Q ₃Conducting is delivered to voltage protection circuits for triggering Q with signal ₄, make it conducting.Under-voltage signal amplifies indicating circuit, under normal circumstances, and Q ₂End D ₁₀Unglazed, in case voltage descends C ₄On when the output of under-voltage signal is arranged, Q ₂Conducting, D ₁₀Little bright, instructed voltage is on the low side, if this signal continues to increase to negative direction, and when having surpassed rated value (that is to say that rated value fell in supply voltage), Q ₂Just enter saturation conduction, D ₁₀Incandescent, R ₂Last voltage drop surge is to voltage protection circuits for triggering Q ₄Conducting is with C ₅On voltage bleed off Q _7-9End, relay discharges, and has realized that voltage is super, function under proteciton.

The rotation-clogging protection circuit comprises the stall indicating circuit, by D ₁₂, R ₉Form; The rotation-clogging protection circuits for triggering are by Q ₆, W ₇Form; The rotation-clogging protection indicating circuit, when the motor normal starting, C ₉On voltage can not make rotation-clogging protection circuit Q ₆Conducting, D ₁₂Can be not luminous yet, only at motor for a certain reason, starting current increases, and has surpassed rated value (by W ₇Set up) time, Q ₆The very fast conducting of meeting, D ₁₂Luminous, and make and door D ₁₁The positively biased conducting is with C ₅On voltage bleed off Q _7-9End, realize the rotation-clogging protection function.

The overload protection circuit comprises current sampling circuit, by B ₃, D _21-24, C ₇Form; Stall target signal filter circuit is by C ₆And W ₅Form, the overload protection circuits for triggering are by Q ₅, W ₅, W ₆, C ₆Form, the overload indicating circuit is by D ₁₃, R ₉Form, current sampling circuit just has correspondingly direct voltage from C when electric motor starting ₇Last output, this voltage is very high second at the 2-3 of starting, and electric motor starting is finished afterwards; when entering normal operation, just lowered, approximated original 1/4-1/7; the overload protection circuit is when the motor normal starting, though electric current greatly to the normal 4-7 that moves doubly, because W ₆And C ₆Existence, this signal has been filtered out, when motor normally moves, C ₆On voltage can not make Q ₅Conducting, D ₁₃Can be not bright, have only because of certain reason, when the motor power consumption increases, Q ₅Just meeting conducting, D ₁₃Glimmer, indication motor is overload a bit, if electric current increases when having surpassed rated value Q again ₅With regard to saturation conduction, D ₁₃Incandescent, Q ₅Collector voltage drops to about 0.8V, D ₁₄The positively biased conducting is with C ₅Powering on presses, Q _7-9End, thereby realize the overload protection function.

Leakage protection circuit comprises the earth leakage protective circuits for triggering, by Q ₁₀Form, the electric leakage indicating circuit is by R ₉, Q ₁₅Form; The earth leakage protective hookup is by R ₂₀, QA ₂Form; The electric leakage signal pick-up circuit is by B ₄, D _19-20, C _8-9And C ₁₅Form, leakage protection circuit, under normal circumstances, the electric leakage signal pick-up circuit is provided with voltage output, reaches about 30mA C in case electric leakage takes place ₉On just have the output of high direct voltage, trigger controllable silicon Q ₁₀Conducting, thereby D ₁₅Luminous (incandescent), D ₁₆The positively biased conducting is with C ₅Powering on presses Q7-9 and ends, thereby realizes creepage protection function.

The diode OR gate circuit is by D ₁₁, D ₁₄, D ₁₆Form, relay promotes circuit by Q _7-9, R ₂₁Form, relay circuit is by J ₁, R ₂₁, D ₁₈, C ₁₀Form, the Fast starting circuit is by R ₇, QA ₁Form, starting delay circuit is by R ₈, W ₃, C ₅Form.

By top narration as can be seen, the utlity model has following advantage: multiple functional, highly sensitive; strong interference immunity, in case the automaticity height is the defencive function starting; as long as fault is got rid of or voltage has been returned to normal value; protector can automatically terminate guard mode, is returned to normal operating conditions, except that earth leakage protective; the protection range of various defencive functions all can be adjusted; cost is extremely low, except that being used for electric motor protecting, also can be used for other power consumption equipment protection.

Claims (1)

1, a kind of monophase machine five-function electronic protector, form by movement circuit and shell, movement circuit is corresponding continuous with each element on the shell by lead, it is characterized in that: the both sides that the front of shell is equipped with earth leakage protective test button (1), Fast starting button (2), superpressure indicator light (3), under-voltage indicator light (4), stall indicator light (5), overload indicator light (6), electric leakage indicator light (7), shell are respectively equipped with inlet wire jack (8) and go out line jack (9);

Movement circuit comprises power circuit; voltage protection circuit; relay promotes circuit; the rotation-clogging protection circuit; the overload protection circuit; the diode OR gate circuit; relay circuit; leakage protection circuit; the Fast starting circuit; ten element circuits such as starting delay circuit; power circuit connects each element circuit; the output of voltage protection circuit promotes circuit with relay and links to each other; the output termination diode OR gate circuit of rotation-clogging protection circuit; the overload protection circuit output end links to each other with the diode OR gate circuit; the output of leakage protection circuit also links to each other with the diode OR gate circuit; the output of diode OR gate circuit promotes circuit with relay and links to each other; the Fast starting circuit output end connects relay and promotes circuit; the starting delay circuit output also connects relay and promotes circuit; relay promotes circuit output end and links to each other with relay circuit, the load of relay circuit output termination.

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