CN2569398Y - Safety device for household electric appliance - Google Patents
Safety device for household electric appliance Download PDFInfo
- Publication number
- CN2569398Y CN2569398Y CN 02277208 CN02277208U CN2569398Y CN 2569398 Y CN2569398 Y CN 2569398Y CN 02277208 CN02277208 CN 02277208 CN 02277208 U CN02277208 U CN 02277208U CN 2569398 Y CN2569398 Y CN 2569398Y
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- CN
- China
- Prior art keywords
- output
- connects
- rectifier
- thyristor
- zero sequence
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a safety device for household electric appliances. The input terminal and the output terminal of the utility model are respectively connected with a commercial power source and the load of an electric appliance. The utility model is characterized in that the input terminal and the output terminal of a power source are connected by the series connection of an automatic tripping switch, an electric current detecting mutual inductor and a zero sequence electric leakage detecting transformer; the input terminal of a power source fire wire on one side of the zero sequence electric leakage detecting transformer and an output zero line of the power source are connected by the bridge connection of a charging device, a test button and a test resistor; the outputs of the electric current detecting mutual inductor and the zero sequence electric leakage detecting transformer, which pass through a rectifier, are connected to the control electrode of a thyristor; a tripping electromagnet coil is connected in series to the loop of the anode of the thyristor. The utility model has the advantages of simple structure, reasonable design, complete functions, high safety, and good technology performance.
Description
Technical field:
The utility model relates to the emergency protective device in the electricity field, is specifically related to a kind of emergency protective device of household electrical appliance.
Background technology:
Original household electrical appliance emergency protective device only is a kind of earth leakage circuit-breaker; when getting an electric shock appears in human body contact household electrical appliance power supply; its zero sequence detection of electrical leakage transformer induction output electric leakage signal; trigger the controllable silicon conducting; tripping coil gets electronic work; power supply disconnects; carry out protection; this earth leakage circuit-breaker function singleness; when thunder and lightning high pressure or mains-supplied line fault occurring and be 380V and during household electrical appliance faults itself overload flow, can not protect, cause user's colour TV; refrigerator; damage is arranged when stereo set and other household electrical appliance; make troubles to daily life, economic loss is serious.
Summary of the invention:
Technical problem to be solved in the utility model is: solve existing household electrical appliances emergency protective device and only can not realize the problem protected for the function singleness of earth leakage circuit-breaker, chance thunder and lightning, overvoltage, overcurrent, and provide a kind of and realize thunder and lightning overvoltage, overcurrent, earth leakage protective, be active in one's movements, multiple functional, reasonable in design, function admirable, be convenient for people to live, avoid the Safety device for household electric appliance of economic loss.
The technical solution adopted in the utility model is: civil power connects the power input of Safety device for household electric appliance, the household electrical appliance load connects the power output end of Safety device for household electric appliance, between power input and power output end, be serially connected with automatic dropout switch, the current detecting instrument transformer, zero sequence detection of electrical leakage transformer, power firestreak input and opposite side power supply in zero sequence detection of electrical leakage transformer one side are exported between the zero line and cross-over connection has discharger and test knob, test resistance, the output of current detecting instrument transformer connects rectifier, rectifier output connects the control utmost point of thyristor, the secondary coil output of zero sequence detection of electrical leakage transformer connects rectifier, rectifier output also connects the control utmost point of thyristor, the anode of thyristor connects the output of rectifier, and two inputs of rectifier connect release electromagnet coil and power supply output line respectively, and the other end of release electromagnet coil connects another power supply output line.
Advantage and good effect:
1, anti-thunder and lightning: at thunderstorm season, power supply conductivity line line cuts the big thunder and lightning magnetic field impulse ripple of extra-heavy relatively, can produce 10,000 volts pulse voltage, this protector can be on household electrical appliances safety line of demarcation the turned off in synchronization power supply, household electrical appliances can be not destroyed yet simultaneously, obtains to protect.
2, the anti-interchange exceeds the quata to decide limiting voltage: when the three-phase and four-line power supply circuits long neglected and in disrepair; loose contact of zero line joint or primary ageing of insulation cause turn-to-turn short circuit and voltage momentary fluctuation etc.; it is 380 volts that the capital jumps 220V voltage, and protector can both shield in the safety line of demarcation.
3, limit overload current, protector can arbitrarily be set overcurrent and start to control a little according to user householder's electrical appliance total current size, after electric current is greater than threshold value, in time cuts off the electricity supply.12A-48A is adjustable for the electric current class.
4, anticreep: as to leak electricity as electrical equipment, for guaranteeing personal safety, when leakage current can in time be cut off the electricity supply during greater than 10mA automatically.
5,,, can prevent short circuit accident electric spark time-delay and the fire that causes through micro-analysis because of cut-out is active in one's movements fast.
6, adopt modern sophisticated technologies, simple in structure, reasonable in design, easy to manufacture, multiple functional, security performance is good, and the daily life that is convenient for people to should vigorously promote the use.
Description of drawings:
Fig. 1 is the utility model electrical schematic diagram
Embodiment:
Referring to Fig. 1, power input X, the N of this Safety device for household electric appliance are electrically connected with the city, power output end X
1, N
1Connect the mutual lotus of household electrical appliance, at power input X, N and power output end X
1, N
1Between be serially connected with automatic dropout switch ZK, current detecting instrument transformer KB
1, zero sequence detection of electrical leakage transformer KB
2, at the power firestreak input Y and the opposite side power supply output zero line N of zero sequence detection of electrical leakage transformer one side
1Between also cross-over connection discharger BL and test knob AN, test resistance R are arranged
3, test knob AN, test resistance R
3The series connection back is in parallel with discharger BL, current detecting instrument transformer KB
1Output connect rectifier ZL
1Input, and current detecting instrument transformer KB
1Output enabling signal also in parallel discharge resistance R
4, series current thresholding adjuster R, R
4Can adopt semistor, rectifier ZL
1Output connect the control utmost point G of thyristor BT, also be connected with voltage-stabiliser tube WY, safety margin adjusting resistance R between control utmost point G and the thyristor negative electrode
1, subzero temperature thermistor R
2, zero sequence detection of electrical leakage transformer KB
2Both sides be the number of turn of equity, be connected on respectively on power supply two input, the output line, but zero sequence detection of electrical leakage transformer KB
2The secondary coil L that also has one 2500 circle, two outputs of this secondary coil L connect rectifier ZL
2Input, rectifier Z
2The output of L also is connected to the control utmost point G of thyristor BT, and the anode of thyristor BT connects rectifier ZL
3Output, and rectifier ZL
3Two inputs connect release electromagnet coil J and power supply output line N respectively
1, the other end of release electromagnet coil J connects another power supply output line X
1
Operation principle:
When the step down side conductor wire cuts powerful thunder and lightning magnetic field impulse ripple relatively, will respond to ten thousand volts of above impulse wave voltages moment, be superimposed upon on the 220V power firestreak.This momentary pulse voltage carries out energy by household electrical appliance and discharges, and can destroy the household electrical appliance that using.
The overall process of the art of this patent prevention thunder and lightning is as follows: when the lightening pulse wave voltage produced, lightening pulse voltage was superimposed upon on the power firestreak, entered closed dynamic/static contact A, current detecting instrument transformer KB by power firestreak
1, zero sequence detection of electrical leakage transformer KB
2, household electrical appliances load to other end N
1, detect primary half of coil KB in addition by zero sequence again
2Behind dynamic/static contact B, enter zero line N to the earth, constitute the release loop.When the voltage one of stack arrived 285V point position, this voltage was by tripping coil J, bridge rectifier ZL
3The anode of single-phase thyristor BT, because of the withstand voltage of thyristor is 800V at present, normal working voltage is 220V, and when voltage rose to safety margin voltage, portion produced little leakage current of 4UA within it, and this little leakage current passes through resistance R
2Produce the pressure drop of 0.7V, make complete saturation conduction of thyristor BT and self-insurance, at this moment tripping coil generated an electromagnetic field with regard to moment, the action of magnetic field suction tripping mechanism, under the effect of three spring thrusts, make two pairs of instantaneous trippings of dynamic/static contact A-B, when two pairs of dynamic/static contacts arrive ultimate range, the lightening pulse wave voltage also reaches maximum synchronously, utilize this natural high-power resistance of air to block big electric current, placed restrictions on by electric current at this moment, electric current spark arcing intensity is also corresponding reduces to minimum, do not damage dynamic/static contact, colour TV can not broken by thunder and lightning.
1200V is selected in the withstand voltage design of thyristor for use, works reliably in order to make its long-term safety, utilizes discharge tube BL to cross zero sequence detector KB
2Be connected to Y-N
1On 2, when the pulse potential of ordering as Y rose to 400VP, discharge tube BL just began to discharge, and raise N with the Y point voltage
1The point current potential also increases load side X
1-N
1The current potential at two ends remains in the boundary of safe potential difference, is 9MM because of dynamic/static contact has drawn back at this moment, and the voltage of 27000V capable of blocking is high again as lightning voltage, punctures this air distance, and discharge tube is protected as defence line, second road.
Determining of safety margin voltage: color television set, computer, part air conditioner all are to adopt most effective switch pumping source at present, the power supply of switch pumping source is the alternating voltage with 220V, behind bridge rectifier, under the filtering of 220UF electric capacity, become the direct voltage of 310V, and the withstand voltage of this electric capacity, minimum selecting for use is 440V, and the first line of defence is when 285V, and protector has just disconnected.Relevant with it in addition high-power switch tube, withstand voltage is 1500V, as switching tube in when work, switch transformer is under the normal duty situation, and its multiple that releases energy is 3 times, the pulse voltage of instantaneous 400VP, do not surpass switching tube safety margin voltage yet, can not damage household electrical appliance.
For safe and reliable, whenever the build-up of luminance electric current of discharger BL,, produce a signal by zero sequence leakage indicator one side coil, the control utmost point G through rectifier ZL2 is added to thyristor BT also can make the tripping mechanism action.
Long neglected and in disrepair as the three-phase four-wire power supply circuit, loose contact after the oxidation of zero line joint, perhaps supply transformer is aging, and elementary generation turn-to-turn short circuit all can make alternating voltage surpass more than the 300V, and when alternating voltage one arrived 285V, tripping mechanism will automatic brake separating.As house lead in voltage is 380V, supposes not handle well, can repeatedly not close sneek.
The current detecting instrument transformer is provided with the staged electric current class adjuster of 12A-48A.How many electricity consumers can oneself be selected to adjust according to the electrical equipment total current of oneself.Change class, the size of current that flows through protector is restricted.If any apparatus failure, electric current surpasses the protector predetermined value, the protection of protector auto-cutout at once at this moment.Earth leakage protective: the design leakage current surpasses 10MA, and tripping mechanism will automatic brake separating, has guaranteed personal safety.
Claims (1)
1, a kind of Safety device for household electric appliance, it is characterized in that civil power connects the power input of Safety device for household electric appliance, the household electrical appliance load connects the power output end of Safety device for household electric appliance, between power input and power output end, be serially connected with automatic dropout switch, the current detecting instrument transformer, zero sequence detection of electrical leakage transformer, power firestreak input and opposite side power supply in zero sequence detection of electrical leakage transformer one side are exported between the zero line and cross-over connection has discharger and test knob, test resistance, the output of current detecting instrument transformer connects rectifier, rectifier output connects the control utmost point of thyristor, the secondary coil output of zero sequence detection of electrical leakage transformer connects rectifier, rectifier output also connects the control utmost point of thyristor, the anode of thyristor connects the output of rectifier, and two inputs of rectifier connect release electromagnet coil and power supply output line respectively, and the other end of release electromagnet coil connects another power supply output line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277208 CN2569398Y (en) | 2002-09-05 | 2002-09-05 | Safety device for household electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277208 CN2569398Y (en) | 2002-09-05 | 2002-09-05 | Safety device for household electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2569398Y true CN2569398Y (en) | 2003-08-27 |
Family
ID=33740874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02277208 Expired - Fee Related CN2569398Y (en) | 2002-09-05 | 2002-09-05 | Safety device for household electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2569398Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919017A (en) * | 2007-12-28 | 2010-12-15 | 松下电工株式会社 | Direct current switch |
-
2002
- 2002-09-05 CN CN 02277208 patent/CN2569398Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919017A (en) * | 2007-12-28 | 2010-12-15 | 松下电工株式会社 | Direct current switch |
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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 |