CN2412302Y - Multifunctional protector for electrical appliances - Google Patents
Multifunctional protector for electrical appliances Download PDFInfo
- Publication number
- CN2412302Y CN2412302Y CN 97242245 CN97242245U CN2412302Y CN 2412302 Y CN2412302 Y CN 2412302Y CN 97242245 CN97242245 CN 97242245 CN 97242245 U CN97242245 U CN 97242245U CN 2412302 Y CN2412302 Y CN 2412302Y
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- circuit
- feedback
- voltage
- lightning protection
- comparison
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Abstract
The utility model relates to a multifunctional protector for electrical appliances. A comparison circuit can compare various abnormal signals sent by a feedback circuit with reference voltage, and sends comparative results to a time-delay executive part to make the time-delay executive part motion; an electrical appliance and a power supply are switched on or switched off. A filtering lightning protection part can suppress the mutual interference of power network and the electrical appliance, and can prevent thunder and lightning from entering a room along a power supply line. The utility model has sensitive, rapid and reliable motion, and is capable of relieving fuse replacement. The multifunctional protector can select whether automatic electric feeding after motioning. The utility model has a plurality of protective functions of voltage protection, ground line monitoring, time delay protection, electrical leakage protection, short circuit protection, over-voltage protection, under-voltage protection, overload protection, etc.
Description
The utility model relates to a kind of multifunctional electric appliance protector.
Existing Protector for electric appliance, as function singlenesses such as automatic switch, earth leakage protective device, insurance kings, that the general inner components and parts with kinds of protect function repeat is many, cost is higher, installation is loaded down with trivial details, and automatic recovery of power supply selectively after moving.As insure the king, and can only protect overvoltage, move after the overvoltage; make circuit be short-circuit condition; fusing house lead in fuse, deenergization reaches the purpose of protection; but it is normal whether line voltage recovers; the user can't judge, change new fuse after, it is fused once more; the instantaneous short circuit electric current human body of also may burning, safety box is also fragile.A large amount of employings of Switching Power Supply, High-frequency Interference is increased thereupon, the disturbing pulse that various electrical equipment switchings produce causes severe contamination to electrical network, the electrical type household electrical appliances, particularly with CPU the easy momentary aberration of household electrical appliances function of control centre, as the open and close meeting of fluorescent lamp, lamp dimmer make TV screen irregular bright spot occur, bright wisp disturbs, and when serious even destroy synchronously, causes audio distortions, noise occurs, and lose the peak and disturb the insulation of going back the entail dangers to circuit.In the high and low useful life that directly affects household electrical appliance of line voltage, the household electrical appliances operating current of too high voltage in will use increases, heating, makes the insulation premature aging, simultaneously also to the insulation of electric equipment, the withstand voltage danger side of body that causes; Cross low voltage and will make the electric equipment starting difficulty, can burn motor etc. when serious.The intermittence that circuit causes because of maintenance stops sending electricity, will produce impulse current to the household electrical appliances in the work, can cause colour TV to scrap too early, the freezer compressor Fraquent start makes motor overheating, particularly adopt the compressor of PTC thermal element, not only starting difficulty can be burnt it when serious.Existing current mode leakage protector, in electric equipment electric leakage and earth connection when disconnecting at total ground connection place, earth leakage protective device can not be cut off the electricity supply because of electric current does not form the loop, like this, all will have dangerous voltage on the metal shell of the household electrical appliances on all earth connections.
The purpose of this utility model is to avoid above-mentioned weak point of the prior art; and provide a kind of simple in structure; cost is low; safe in utilization, convenient; can select whether send electricity automatically after the action, be active in one's movements, rapidly, reliably, strong interference immunity, have voltage, ground wire and monitor; time-delay, the multifunctional electric appliance protector of protections such as electric leakage, short circuit, overvoltage, under-voltage, overload.
Design of the present utility model is as follows:
A kind of multifunctional electric appliance protector, comprise time-delay operating part (4) and rectifying part (2), its special character is, it also comprises filtering lightning protection part (1), comparison circuit (3) and feedback circuit (5), the output of described feedback circuit (5) is through comparison circuit (3) input time delay operating part (4), and the output of time-delay operating part (4) is connected to the input of filtering lightning protection part (1); Described feedback circuit (5) can comprise overload feedback, short circuit and imperfect earth feedback, electric leakage feedback, overvoltage and under-voltage and zero-pressure feedback, described overload feedback can comprise the thermistor RT that closely contacts with the middle filter coil of filtering lightning protection part (1), described short circuit, imperfect earth feedback can comprise resistance R 3, bidirectional trigger diode SD, one end and filtering lightning protection part (1) are joined, the other end is connected to the gate pole of controllable silicon SCR 1, and described electric leakage feedback can comprise detection of electrical leakage coil L3; Described comparison circuit (3) is made of four voltage comparator ics 2 and peripheral benchmark comparison resistance thereof, comprises overload comparison, overvoltage and under-voltage and zero-pressure comparison, electric leakage comparison, short circuit and imperfect earth comparison; Contact J1-1, the J1-2 of described time-delay operating part (4) repeat circuit J is connected to the input of filtering lightning protection part (1), and described filtering lightning protection part (1) is made of filter capacitor, filter coil and piezo-resistance.
Filtering lightning protection part of the present utility model (1) can comprise the asymmetric interfered circuit of inhibition that capacitor C 1～C2 and piezo-resistance RV1 and filter coil L1～L2 constitute; Also comprise the inhibition symmetric disturbance circuit of forming by capacitor C 3～C4 and piezo-resistance RV2～RV3.The equal available transient voltage of piezo-resistance RV1～RV3 suppresses diode and substitutes.
Filtering lightning protection part of the present utility model (1) can be π type power-supply filter or the two π filter that is made of piezo-resistance, filter capacitor and filter coil.
Base integrated package IC3 when time-delay operating part of the present utility model (4) can comprise, its input is connected to discharge diode D2 and the snap switch K2 of delay capacitor C7 and G, and its output meets inverter BG1, and the output of inverter BG1 is succeeded electrical equipment J through controllable silicon SCR 2.Also available great power bidirectional controllable silicon of relay J or high power AC solid-state semiconductor relay substitute.
The accompanying drawing drawing is described as follows:
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
The utility model is described in further detail below in conjunction with accompanying drawing:
Referring to Fig. 1; filtering lightning protection part 1 of the present utility model is used to purify line voltage, suppresses Disturbance in Power Net and sends into household electrical appliance along power line, and the interference that also suppresses the power consumption equipment generation enters electrical network; and it is indoor to prevent that lightning wave from entering along power line, is used for overvoltage protection simultaneously.Rectifying part 2 is used for the civil power step-down, and adjusts into direct current and use for the utility model each several part circuit.Comparison circuit 3 is that various signal voltages and reference voltage that feedback circuit 5 is sent into are compared, and comparative result is sent into time-delay operating part 4 with high-impedance state or low resistance state form.Time-delay operating part 4 is connected power consumption equipment and main circuit time-delay, disconnect or manually momentary connection according to the output signal of comparison circuit 3, finishes transmission or not.Feedback circuit 5 is that various abnormal conditions are fed back to comparison circuit 3 with voltage height form, and the parameter value of itself and normal condition is made comparisons.Feedback circuit 5 comprises the overload feedback, overvoltage, under-voltage, zero-pressure feedback, short circuit, imperfect earth feedback and electric leakage feedback etc.
Referring to Fig. 2, to disturb to comprise asymmetric interference and symmetric disturbance, with big high attenuation, anti-interference filtration capacitor C 1～C4 is short-circuit condition to High-frequency Interference and spike interference, and inhibitory action is well arranged after filtering lightning protection part 1 in these interference; Zinc-oxide piezoresistor RV1～RV3 has filtering lightning protection double action, it has very high reaction speed to lightning wave, the discharge off delay phenomenon, and overvoltage or spike had good absorption, inhibition ability, suppress the disturbing pulse transmitted in both directions, wherein RV1 also has the overvoltage protection effect; Capacitor C 3, C4 and piezo-resistance RV2, RV3 can suppress symmetric disturbance, and capacitor C 1, C2 and piezo-resistance RV1 and coil L1, L2 form power-supply filter, suppress asymmetric interference; Coil L1, L2 are on same magnetic core, and coefficient of mutual inductance approaches 1.Civil power is sent into the reduction voltage circuit step-down of being made up of resistance R 1, capacitor C 5 behind the current limiting element PTC of rectifying part 2, again through diode D1 rectification, send into three-terminal voltage-stabilizing ic chip 1 after capacitor C 6 filtering and finish voltage stabilizing, exports a stable DC.Piezo-resistance RV4 and current limiting element PTC constitute holding circuit.Light-emitting diode LD1 is short circuit or imperfect earth protection indicator light, and light-emitting diode LD2 is that civil power has electricity and control circuit to connect indicator light.Comparison circuit 3 is made up of single supply four voltage comparator ics 2 benchmark comparison circuits peripheral with it, during fault-free, 5 pin voltages are higher than 4 pin among the comparator IC2,7 pin voltages are higher than 6 pin, 9 pin voltages are higher than 8 pin, 11 pin voltages are higher than 10 pin, then are output as high-impedance state, allow the capacitor C 7 in the time-delay operating part 4 to charge; When breaking down, comparator IC2 output becomes low resistance state moment, makes time-delay operating part 4 snap actions, makes the disconnection of power consumption equipment and incoming power, reaches the protection purpose.Comparator IC2 is the LM339 integrated package, 5,4,2, each pin be overvoltage relatively, 7,6,1 each pin for overload relatively, 9,8,14 each pin be under-voltage, zero-pressure, short circuit, imperfect earth failure ratio.When comparison circuit 3 is output as high-impedance state, when being fault-free, 2 pairs of delay capacitor C7 chargings of the resistance R of power supply time-delay operating part 4, when 2, the 6 pin voltages of basic at that time integrated package IC3 are higher than 5 pin, 3 pin moments of its output pin become low resistance state, and it is electric that relay J is got, its contact J1-1, J1-2 closure, power consumption equipment and main line are connected, and the charging interval can be designed to 10 minutes; In the time need not delaying time, can press snap switch K2, make the instantaneous adhesive of relay J, power consumption equipment and main line are connected, because effect under-voltage, the zero voltage protection circuit, capacitor C 7 charging of at every turn all starting from scratch can be protected the consistency of each delay time thus.If when work, the output transition of comparison circuit 3 is a low resistance state, capacitor C 7 sparks, 3 pin moments of base integrated package IC3 become high level when making, triode BG1 saturation conduction, controllable silicon SCR 2 is non-conductive, the relay J coil losing electricity, its contact J1-1, J1-2 disconnect, thereby electrical network and power consumption equipment are disconnected.Feedback circuit 5 is made of a plurality of feedback circuits, and the electric current that the overload feedback is used for monitoring stream coils L1, L2 changes, and current change quantity is converted to voltage form by thermistor RT, sends in the comparison circuit 3.When element is provided with, thermistor RT closely contacts with coil L1, L2, because thermal effect, coil temperature has reflected the size of institute's flowing through coil electric current to a certain extent, and variations in temperature will make the resistance of thermistor RT change, and causes that the 7 foot voltages of comparator IC2 change, when the electric current of flowing through coil makes coil temperature surpass set point, the voltage of 7 pin of comparator IC2 will be lower than 6 pin, comparator IC2 output becoming low resistance state, time-delay operating part 4 action power dumps.After coil temperature recovered normally, through time-delay, circuit sent electricity automatically again and connects power consumption equipment.Overvoltage, under-voltage, zero-pressure feedback are used to monitor whether line voltage surpasses or be lower than set point, if line voltage is normal, the A point voltage will be lower than the voltage of 5 pin among the comparator IC2 in the circuit, and be higher than the voltage of 8 pin; When electrical network was undesired, the A point voltage will increase thereupon or reduce, i.e. overvoltage or under-voltage, thus make comparison circuit 3 outputs become low resistance state, cut off incoming power by time-delay operating part 4; After line voltage recovers normally, send electricity through time-delay, the power consumption equipment energized.Piezo-resistance RV1 has the overvoltage protection effect equally.Short circuit, the effect of imperfect earth feedback circuit have two; the one, the voltage of when the power consumption equipment short circuit, cutting off the electricity supply; the 2nd, when ground connection is bad, send the imperfect earth signal; it all is to realize by under-voltage protecting circuit; but when short circuit, imperfect earth fault; circuit can not automatic time delay, send electricity, because the characteristic of controllable silicon SCR 1 can only be sent in the hand-reset time-delay.After the power consumption equipment short circuit, line voltage all drops on filter coil L1, the L2, and B point voltage moment rising in the circuit causes that by resistance R 3 the C point voltage raises, trigger controllable silicon SCR 1 conducting, make the moment reduction of D point voltage, since the effect of diode D2, the moment reduction of A point voltage, make the 9 pin voltages of the comparator IC2 in the comparison circuit 3 be lower than 8 pin, comparator IC2 output becomes low resistance state and cuts off the electricity supply rapidly, and light-emitting diode LD1 is luminous simultaneously, the indication short trouble.Because controllable silicon SCR 1 self-characteristic, circuit must pass through K switch 1 hand-reset, could start and send.When ground connection is bad; because the effect of capacitor C 3; there is conducting in bidirectional trigger diode SD because of earth connection has voltage; the C point voltage is raise and 1 conducting of triggering controllable silicon SCR; the D point voltage lowers rapidly; the effect of diode D2 makes the E point voltage be lower than 8 pin of comparator IC2 rapidly, reaches the purpose of protection in under-voltage mode.Fault resets controllable silicon SCR 1 by hand switch K1 after getting rid of, and electricity is sent in starting, and light-emitting diode LD1 is luminous, indication fault.Electric leakage feedback adopts current mode earth leakage protective mode, and it can reflect the leakage current size, and leakage current is converted to voltage by magnetic test coil L3 forms and send into comparison circuit 3.Detection of electrical leakage coil L3 goes here and there equably on power filter coil magnetic core, in flowing through coil L1, L2 during current imbalance, detection of electrical leakage coil L3 will produce mutual voltage, current imbalance in coil L1, L2, electric current is during greater than set point, and coil L3 goes up induced voltage will make that 10 pin voltages are higher than 11 pin among the comparator IC2, thereby make comparison circuit 3 output low resistance states, time-delay operating part 4 snap actions, the voltage of cutting off the electricity supply.Because earth leakage protective adopts unbalanced type,, can protect single-phase shorted to earth accident simultaneously so can prevent method stealing with a fiery ground.Three-terminal voltage-stabilizing ic chip 1 of the present utility model can adopt 78L * * serial three-terminal voltage-stabilizing integrated package; Comparator IC2 can adopt LM339, also can adopt four kinds of voltage comparators such as homemade J139, J239, J2901 or import IR2339NTM2901M; Time base integrated package can adopt LM555.
The utility model compared with prior art has following advantage:
1, adopt the medium-scale integration circuit, simple in structure, cost is low, be active in one's movements, Reliably, rapidly, oneself power consumption is low;
2, function is many, has electrical network filtering, purifies electrical network, electrical network overvoltage, under-voltage guarantor Protect, the overload protection, short-circuit protection, earth leakage protective, the bad protection of ground connection, electricity is sent in time-delay, Prevent a fiery ground stealing, the several functions such as lightning protection.
3, the filter coil double detection of electrical leakage coil of being used as has simultaneously reduced number of elements; The filter coil core adopts iron, nickel, molybdenum 50 rings, and its saturation induction density height is difficult for full With.
4, because circuit operation is rapid, when electricity consumption equipment is short-circuited, at fuse Just cut off main power source before the fusing, so removed the trouble that the user changes fuse from.
5, circuit can select whether automatically to send electricity after fault takes place. That is, when short circuit, When the faults such as ground connection is bad take place, must manually reset, could delay time then and send electricity, and But after other fault takes place then automatic time delay send electricity.
6, be provided with unique earth connection and imperfect earth protective circuit, can prevent the charged electric shock accidents that causes of equipment metal shell.
7, install simply, safe in utilization, convenient.
Claims (6)
1, a kind of multifunctional electric appliance protector, comprise time-delay operating part (4) and rectifying part (2), it is characterized in that: it also comprises filtering lightning protection part (1), comparison circuit (3) and feedback circuit (5), the output of described feedback circuit (5) is through comparison circuit (3) input time delay operating part (4), and the output of time-delay operating part (4) is connected to the input of filtering lightning protection part (1); Described feedback circuit (5) comprises overload feedback, short circuit and imperfect earth feedback, electric leakage feedback, overvoltage and under-voltage and zero-pressure feedback, described overload feedback comprises the thermistor RT that closely contacts with the middle filter coil of filtering lightning protection part (1), described short circuit, imperfect earth feedback comprise resistance R 3, bidirectional trigger diode SD, one end and filtering lightning protection part (1) are joined, the other end is connected to the gate pole of controllable silicon SCR 1, and described electric leakage feedback comprises detection of electrical leakage coil L3; Described comparison circuit (3) is made of four voltage comparator ics 2 and peripheral benchmark comparison resistance thereof, comprises overload comparison, overvoltage and under-voltage and zero-pressure comparison, electric leakage comparison, short circuit and imperfect earth comparison; Contact J1-1, the J1-2 of described time-delay operating part (4) repeat circuit J is connected to the input of filtering lightning protection part (1), and described filtering lightning protection part (1) is made of filter capacitor, filter coil and piezo-resistance.
2, multifunctional electric appliance protector as claimed in claim 1 is characterized in that: described filtering lightning protection part (1) comprises the asymmetric interfered circuit of inhibition that capacitor C 1～C2 and piezo-resistance RV1 and filter coil L1～L2 constitute; Also comprise the inhibition symmetric disturbance circuit of forming by capacitor C 3～C4 and piezo-resistance RV2～RV3.
3, multifunctional electric appliance protector as claimed in claim 1 or 2 is characterized in that: described filtering lightning protection part (1) is π type power-supply filter or the two π filter that is made of piezo-resistance, filter capacitor and filter coil.
4, multifunctional electric appliance protector as claimed in claim 3; it is characterized in that: described time-delay operating part (4) is base integrated package IC3 when comprising; its input is connected to discharge diode D2 and the snap switch K2 of delay capacitor C7 and C7; its output meets inverter BG1, and the output of inverter BG1 is succeeded electrical equipment J through controllable silicon SCR 2.
5, multifunctional electric appliance protector as claimed in claim 3 is characterized in that: described piezo-resistance also can adopt transient voltage to suppress diode.
6, multifunctional electric appliance protector as claimed in claim 4 is characterized in that: described relay J also can adopt great power bidirectional controllable silicon or high power AC solid-state semiconductor relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97242245 CN2412302Y (en) | 1997-12-31 | 1997-12-31 | Multifunctional protector for electrical appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97242245 CN2412302Y (en) | 1997-12-31 | 1997-12-31 | Multifunctional protector for electrical appliances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2412302Y true CN2412302Y (en) | 2000-12-27 |
Family
ID=33951541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97242245 Expired - Fee Related CN2412302Y (en) | 1997-12-31 | 1997-12-31 | Multifunctional protector for electrical appliances |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2412302Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895107A (en) * | 2010-08-16 | 2010-11-24 | 宁波市镇海华泰电器厂 | Anti thunder strike circuit for computer |
| CN102082049A (en) * | 2010-12-08 | 2011-06-01 | 天津市翔晟远电力设备实业有限公司 | Protection device for high-voltage line fuse and transmission and distribution detection system |
| CN101340076B (en) * | 2008-08-01 | 2012-07-25 | 张翼洲 | Dual-window voltage comparator wire and delay converting circuit |
| CN104092204A (en) * | 2014-06-26 | 2014-10-08 | 青岛浩海网络科技股份有限公司 | Overcurrent protection intelligent switch for forest fire prevention and overcurrent protection method thereof |
| CN106711982A (en) * | 2016-12-19 | 2017-05-24 | 无锡万吉科技股份有限公司 | Electric leakage protection switch capable of resisting ultrahigh surge voltage |
-
1997
- 1997-12-31 CN CN 97242245 patent/CN2412302Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340076B (en) * | 2008-08-01 | 2012-07-25 | 张翼洲 | Dual-window voltage comparator wire and delay converting circuit |
| CN101895107A (en) * | 2010-08-16 | 2010-11-24 | 宁波市镇海华泰电器厂 | Anti thunder strike circuit for computer |
| CN101895107B (en) * | 2010-08-16 | 2012-05-23 | 宁波市镇海华泰电器厂 | Anti thunder strike circuit for computer |
| CN102082049A (en) * | 2010-12-08 | 2011-06-01 | 天津市翔晟远电力设备实业有限公司 | Protection device for high-voltage line fuse and transmission and distribution detection system |
| CN104092204A (en) * | 2014-06-26 | 2014-10-08 | 青岛浩海网络科技股份有限公司 | Overcurrent protection intelligent switch for forest fire prevention and overcurrent protection method thereof |
| CN106711982A (en) * | 2016-12-19 | 2017-05-24 | 无锡万吉科技股份有限公司 | Electric leakage protection switch capable of resisting ultrahigh surge voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |