CN2059276U - Multi-functional electirc protective device - Google Patents

Abstract

Te utility model discloses a multifunctional electric protective device which is composed of modules of an overvoltage and undervoltage protective circuit, an overload protective circuit, an electric shock protective circuit, a delay electric supply circuit, a lightning arresting circuit, etc.; each of the modules can be implemented independently. The utility model can be installed in an electric network of 220V (and can also be installed in an electric network of 380V after a little modification) for the double protections to electric supply and electric application. The utility model can be widely used on household appliances, and electric apparatus and equipment in industrial and mining establishments, and can also be used for implementing electric management with full automatic techniques in occasions with quantitative electric supply, such as industrial and mining establishments, schools, armies, etc., and in occasions with more electric fraudulent use. The multifunctional electric protective device which is a miniature electric apparatus has the advantages of small size, low cost, complete function, wide purpose, high safety and electric energy saving.

Description

Multi-functional electirc protective device

The utility model belongs to electrical equipment and the field of controlling automatically.

At present, existing Electric protector kind is a lot, electrical power stopper for example, voltage limitator, earth leakage protector, lightning arrester etc.

The purpose of this utility model is for society provides a kind of multiple functional, is widely used, and both can limit high and low voltage, the invasion and attack of restricted power voltage, restriction electrical power, power supply in limited time, suppress thunder and lightning, can prevent the multi-functional Electric protector that short circuit is caught fire and personal electric shock casualty accident takes place again.

The utility model principle as shown in Figure 1.It is by overvoltage/undervoltage and time-delay safety circuit, the overload safety circuit, and all modules of electric leakage safety circuit and lightning circuit are formed, and each module all can be established one's own system, independent enforcement.Each relay contact position all is in no electric release condition.

Overvoltage/undervoltage and time-delay safety circuit principle are as follows:

Alternating current 220V is through B ₃Step-down, D _15～18Rectification, C ₈Filtering and R ₁₈, D ₁₉Provide low-voltage dc power supply to circuit after the voltage stabilizing.R ₁₉, R ₂₀, D ₂₃Form the secondary voltage stabilizing circuit to IC _3～6Reference voltage is provided.R ₁₆, D ₁₄, C ₇, R ₁₇For urban network electricity is pressed sample circuit.R ₁₅, D ₁₀Be the circuit of warning.IC ₄, IC ₃Be respectively the overvoltage/undervoltage comparator.R ₂₁, D _20～22For just with the door network.R ₂₁And C ₉Be the time-delay supply network.IC ₆, J ₃And D ₂₄Carry out the networking for driving.

When the urban network electricity positive pressure often, IC ₃, IC ₄All export high level and (establish IC ₅Also export high level), J ₃Discharge D ₁₀Light C ₉Through R ₂₁The charging time-delay, V _C9Reach IC ₆During positive terminal voltage, IC ₆Output low level, J ₃Electricly pick up that load is got is electric, D ₁₀Extinguish.Urban network electricity was pressed when hanging down, IC ₃Output becomes low level, C ₉Through D ₂₀, IC ₃Discharge rapidly, J ₃Release makes load outage, D ₁₀Light and warn.Urban network electricity is pressed when too high, C ₉Pass through D ₂₁And IC ₄Discharge, load is also cut off the power supply.B ₃The primary electrical sensibility reciprocal is enough big, attacks for a long time with anti-power voltage.

Overload safety circuit principle is as follows:

B ₂Be current sample inductance transformer, D ₇, D ₈Be heavy current impact protection circuit, D ₉, C ₄Be current rectifying and wave filtering circuit, R ₁₄, C ₅Be heavy current impact delay circuit, R ₁₃Adjust resistance for letting out the power of to hold concurrently.D ₆, R ₁₀, R ₁₁Be the circuit of warning, R ₁₂Be protective resistance, T, J ₂And D ₁₁Carry out network for driving.

When load just often, B ₂Be operated in the current transformer state, L ₄To L ₆Induced voltage lower, J ₂Not adhesive, load gets.During overload, L ₆Induced voltage raises, through R ₁₄, C ₅Time-delay makes J ₂Adhesive, B ₂Because J ₂The contact is switched and is operated in transformer state, J ₂Self-insurance.Because L ₅Impedance greater than load impedance, urban network electricity is pressed and mainly to be fallen at L ₅On, load gained voltage is very few and be " outage " state, D ₆Light alarm.Load switch cuts off back J ₂Discharge, restore electricity again.

C ₁, R ₁And BX ₁Form the short circuit protection circuit.When overload or short circuit, BX ₁Fusing, line voltage is reduced to C ₁Two ends catch fire to suppress electric line.And C ₁Can not influence illumination and maintenance to the power supply of small-power lighting load.

SG ₁, SG ₂Be lightning arrester, in order to suppress the destruction of thunder and lightning.

The electric shocked guard circuit theory is as follows:

B ₁Be zero-sequence transformer, by L ₁, L ₂, L ₃And iron core forms, it and D ₂, C ₂, R ₄, R ₅, R ₆And IC ₁Form the leakage current detector, R ₃, D ₁And R ₄Be electric leakage action self-insurance network.R ₇, R ₈, D ₄And C ₃Form the drain voltage detector, D ₃, D ₅And R ₉For or the door.IC ₂, J ₁, D ₁₂, C ₆Carry out network for driving.

When not leaking electricity, J ₁Do not have electricity and discharge J ₃The adhesive load gets.When electric leakage takes place, IC ₂In-phase end becomes high level makes J ₁Adhesive, IC simultaneously ₅Output becomes low level makes J ₃Discharge, this state passes through R ₃, D ₁And R ₄Realize self-insurance, thereby power firestreak separates protection people, machine safety, D simultaneously with people, machine with ground wire ₁₃Light alarm.R ₂And AN ₁Be artificial test-run a machine circuit, AN ₂Be the manual reset knob.

Compared with prior art, the utility model collection is prevented thunder and lightning, the limit overvoltage/undervoltage, and limit power, power supply in limited time, anti-short circuit is caught fire, and functions such as protection against electric shock are in one, and cost is low, and function is strong.Overload circuit adopts single line networking transformer self-insurance mode, and not only making quiescent dissipation is zero, and has overcome the contact chatter phenomenon, also for construction brings convenience, has saved spending.Electric shocked guard adopts electric current and voltage duplex mode, has improved the reliability of electric shocked guard.

The circuit overloads security personnel, overvoltage/undervoltage and time-delay power supply security personnel use with convenient for from the recovery form.Electric shock and short circuit easily cause serious consequence, and circuit design is artificial reset mode, to guarantee safety.

This protector is by the work of quasistatic pattern, and circuit is simple, and power consumption is little, and reliable operation both can guarantee safe power supply, can guarantee safety utilization of electric power again.

The utility model is implemented circuit as shown in Figure 1, and the element value is as follows.

R ₁, R ₁₂, R ₁₆Be 300 ^K, R ₂, R ₆, R ₇, R ₁₄, R ₁₇Be 10 ^K, R ₃Be 51 ^K, R ₄, R ₁₃Be 100 ^K, R ₅Be 7.5 ^K, R ₈Be 270 ^K, R ₉Be 22 ^K, R ₁₀, R ₁₅Be 5.1 ^K, R ₁₁Be 62 ^K, R ₁₈Be 1 ^K, R ₁₉Be 3.3 ^K, R ₂₀Be 6.8 ^K, R ₂₁Be 4.7 ^M

C ₁Be 1 μ F/500 ^V, C _2～7Be 10 μ F/16 ^V, C ₈Be 330 μ F/16 ^V, C ₉Be 100 μ F/16 ^V

D ₇, D ₈, D ₁₉Be 2CW ₂₀, D ₆, D ₁₀, D ₁₃, D ₂₃Be LED, all the other diodes are 1N4004.

J ₁, J ₂, J ₃Be KD4088(P _LDuring≤1000W)

IC is LM324, and T is 3DG6.

B ₁Select the zero-sequence transformer finished product for use.

B ₂Can be at 3W power transformer (secondary 9 ^V) elementary to add around 5T with φ 1 plastic coated wire be L ₄Form.

B ₃With the coiling of 1W transformer core: elementary with φ 0.1 around 4400T, pay the limit with φ 0.15 around 200T.

SG ₁, SG ₂Select the finished product lightning arrester for use.

BX ₁Choose BX according to needs ₂Be 0.1A.

Claims (1)

1. A kind of Electric protector is characterized in that this protector is by the overvoltage/undervoltage safety circuit, the time-delay power supply circuits, the overload safety circuit, the short circuit protection circuit, modules such as electric shocked guard circuit are formed, in overvoltage/undervoltage and time-delay power supply safety circuit, the low pressure source of stable pressure is through B by civil power ₃Step-down, D _15～18Rectification, C ₈Filtering and R ₁₈, D ₁₉Deng the simple and easy source of stable pressure of composition, D ₂₃For IC provides the hold concurrently power supply indication of secondary reference voltage; R ₁₆, D ₁₄With C ₇‖ R ₁₇Be in series as voltage sample device, R ₁₇Upper end and IC ₃Anode links to each other, R ₁₇Slide wall and IC ₄Negative terminal links to each other, IC ₃Negative terminal, IC ₄And IC ₅Anode and D ₂₃Anode links to each other, IC _3,4,5Three just are output as and the door input, with door output through R ₂₁, C ₉Anti-shake time delay network adds to IC ₆Negative terminal, IC ₆Output and J ₃‖ D ₂₄Link to each other IC ₆J during output low level ₃Adhesive powers to the load, B ₃The former limit number of turn is more, attacks for a long time in order to protection 380V high pressure, and in the overload safety circuit, C ₁‖ R ₁‖ BX ₁Be connected in the circuit as short-circuit protection usefulness, L ₄The upper end links to each other lower end and J with electrical network ₂Normally-closed contact phase continuous cropping over-current detection, D6 ‖ R ₁₀With R ₁₁Series connection, an end and L ₄The lower end links to each other, the other end and J ₂The indication of middle contact phase continuous cropping overload, B ₂Pay limit D ₇, D ₈Oppositely link to each other in case high voltage impacts, after current rectifying and wave filtering circuit, R ₁₄And C ₅Series connection constitutes the heavy current impact time delay network, and T drives J with the emitter follower form ₂, at electric shocked guard

   In the road; B ₁Be zero-sequence transformer, make leakage current and detect its pair limit L ₃Induced voltage is through D ₂Rectification (all-wave or multiplication of voltage) C ₂Add to IC after the filtering ₁Anode, IC ₁End of oppisite phase is by R ₅And R ₆Dividing potential drop provides reference voltage; R ₇With D ₄The series connection positive terminal shell of meeting sb. at the airport, negative pole termination C ₃‖ R ₈IC ₁Output meets IC with the output of drain voltage direct current by positive or gate ₂Anode and IC ₅Negative terminal, IC ₂For the emitter follower form drives J ₁, J ₁Coil and D ₁₃The stand by lamp series connection, electric leakage self-insurance He J ₁Moving contact adds to IC after with the power supply step-down rectifier ₁Just bringing in realization; Manually recover by AN ₂Cut off J ₁DC channel realizes; J ₁Middle contact is by its normally-closed contact, J ₃L is passed through with load C Z respectively by its normally opened contact in middle contact ₁, L ₂, L ₄And J ₂Middle contact, normally-closed contact are in series J during electric leakage ₁Adhesive, J ₃Discharge.

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