CN201584743U - Leakage protecting device for resisting high-frequency interference when starting electronic fluorescent lamp - Google Patents
Leakage protecting device for resisting high-frequency interference when starting electronic fluorescent lamp Download PDFInfo
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- CN201584743U CN201584743U CN2009202824138U CN200920282413U CN201584743U CN 201584743 U CN201584743 U CN 201584743U CN 2009202824138 U CN2009202824138 U CN 2009202824138U CN 200920282413 U CN200920282413 U CN 200920282413U CN 201584743 U CN201584743 U CN 201584743U
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Abstract
The utility model provides a leakage protecting device for resisting high-frequency interference when starting an electronic fluorescent lamp, comprising a leakage induction circuit, a leakage detecting circuit and a power supply switching unit, wherein the leakage induction circuit is connected with the leakage detecting circuit and used for inducting a leakage signal, converting the current signal into a voltage signal and transmitting the voltage signal to the leakage detecting circuit; and the leakage detecting circuit is used for filtering, amplifying and rectifying the received leakage signal and then obtaining direct-current voltage which is input to the power supply switching unit. The leakage protecting device is characterized in that the leakage detecting circuit is a leakage breaker chip; two voltage input ends of the chip are bridged with a high-frequency absorbing capacitor which is used for shielding high-frequency interference leakage occurring when the electronic fluorescent lamp is started; and the adopted high-frequency absorbing capacitor can shield the leakage signal above certain frequency, thus avoiding that the leakage switch is operated by mistake when the electronic fluorescent lamp is started and high frequency occurs, and achieving good effect of protecting the circuit.
Description
Technical field
The utility model relates to the earth leakage circuit-breaker technical field, relates in particular to the earth leakage protective device that a kind of anti-electric daylight lamp starts High-frequency Interference.
Background technology
Along with improving constantly of people's quality of life, electronics, electric equipment products have entered huge numbers of families, are also progressively strengthening for the protection person and the awareness of safety of equipment, and the requirement to protector of all kinds simultaneously also improves constantly.
The present employed earth leakage circuit-breaker overwhelming majority of China is the AC type; as long as the protected circuit part is produced by electric leakage; this earth leakage circuit-breaker will move; some high frequency short time electric leakage is necessary for protection equipment in actual applications; to be exactly in order to prevent accident occurs because equipment or human body have to leak electricity for a long time over the ground to the purpose of leakage switch design; the claimed circuit of leakage switch is a urban network electricity; frequency is at 50-60HZ, and the short time electric leakage that the radio-frequency head branch produces is not need protected scope.
In the prior art; a kind of earth leakage circuit-breaker that is used on the electric daylight lamp is arranged; when electric daylight lamp is starting; it starts by a charging capacitor; after the fluorescent start; in order to protect the life-span of this charging capacitor; the abundant bleed off of electricity on this electric capacity need be fallen; and the electron rectifier of this moment has broken from operating circuit; electric bleed off on this electric capacity to be fallen; can only be by discharge over the ground, if the fluorescent lamp that use in place is a lot, and be when opening simultaneously; this bleed off electric current will be very big; when this bleed off electric current reached the earth leakage circuit-breaker rated value, at this moment, earth leakage circuit-breaker will produce misoperation; cut off the protected circuit power supply; so the earth leakage protective device of anti-High-frequency Interference guarantees only to occur when really being equipment or human body Leaked Current of Line to Ground, just the leakage switch that the circuit that needs protection can be protected when needing a kind of electric daylight lamp of exploitation to start.
The utility model content
The purpose of this utility model is, the defective that exists at above-mentioned prior art provides a kind of earth leakage protective device that high frequency makes the switch misoperation that occurs can resist electric daylight lamp to start the time.
The technical solution of the utility model is as follows: a kind of earth leakage protective device that is used for anti-electric daylight lamp startup High-frequency Interference; comprise the electric leakage sensor circuit; electric-leakage detection circuit; power switch unit; described electric leakage sensor circuit links to each other with electric-leakage detection circuit; be used to respond to electric leakage signal and this current signal is changed into voltage signal and be sent to described electric-leakage detection circuit; the electric leakage signal that described electric-leakage detection circuit is used for receiving is through filtering; amplification and rectification obtain a direct voltage and input to described power switch unit; it is characterized in that: described electric-leakage detection circuit is the residual current circuit breaker chip; at two voltage input end cross-over connections, the one high frequency absorption electric capacity of described chip, the High-frequency Interference that occurs when being used for screening electron fluorescent start electric leakage.
The earth leakage protective device of described anti-High-frequency Interference; wherein; described electric leakage sensor circuit comprises the electric leakage inductor and is connected across diode N1 and N2, anti-electromagnetic interference capacitor C 6, sample resistance R3 and the current-limiting resistance R2 of two reverse parallel connections of electric leakage inductor voltage output end respectively; described high frequency absorption electric capacity is capacitor C 7; one end of capacitor C 7 with connect described chip voltage input 1 pin after sample resistance R3 links to each other, capacitor C 7 other ends with connect described chip voltage input 2 pin after current-limiting resistance R2 links to each other.
The earth leakage protective device of described anti-High-frequency Interference, wherein, described chip is non-time-delay residual current circuit breaker chip IC 54123.
The beneficial effects of the utility model are: owing to adopted above-mentioned technical solution; by in original circuit, having increased high frequency absorption electric capacity; electric leakage signal more than the certain frequency can be shielded; thereby when high frequency appears in the electric daylight lamp startup, can not produce misoperation, reach the effect of fine protective circuit leakage switch.
Description of drawings
Fig. 1 is the utility model circuit theory schematic diagram.
Embodiment
The utility model provides a kind of earth leakage protective device that anti-electric daylight lamp starts High-frequency Interference that is used for; for making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
Do not detect the problem of existing switch misoperation when electric leakage being protected to disturbing high frequency to leak electricity in order to solve prior art; the utility model detects the electric leakage of high frequency short time; its design is to have adopted the input (two voltage input pins of chip) at electric-leakage detection circuit and connect a high frequency absorption electric capacity; when the electric leakage frequency reaches certain value at short notice; by high frequency absorption electric capacity; the High-frequency Interference electric leakage part that will occur in the time of will starting owing to electric daylight lamp shields; solved the High-frequency Interference that occurs when anti-electric daylight lamp starts effectively; this earth leakage protective device is only low after certain limit (the urban network electricity frequency is at 50-60HZ) to the electric leakage frequency; earth leakage circuit-breaker just can think this electric leakage be since human body over the ground or equipment have electric leakage to produce over the ground, the earth leakage circuit-breaker deenergization of making a response.Concrete electric leakage frequency reaches how many values to shield by high frequency absorption electric capacity, the appearance values of electric capacity etc. are according to the different product specification and difference, concrete requirement can be selected according to GB16917-2003, and this technology is a technology well-known to those having ordinary skill in the art, does not do detailed description herein.
In conjunction with shown in Figure 1; the earth leakage protective device of anti-High-frequency Interference comprised electric leakage inductor ZCT when the utility model electric daylight lamp started; electric-leakage detection circuit (adopting non-time-delay residual current circuit breaker chip IC 54123); power switch unit P1; under the normal condition, three-phase load electric current and Ground leakage current are in a basic balance, flow through the phasor of electric leakage inductor primary winding electric current and are about zero; promptly the total magnetic flux that is produced in iron core by it is zero, electric leakage inductor secondary coil no-output.When taking place to get an electric shock, shock current becomes the loop by the earth, that is has produced zero-sequence current.This electric current flows back to without electric leakage inductor primary winding; destroyed balance; so the zero sequence magnetic flux is just arranged in the iron core; make the secondary coil output signal; the electric leakage inductor will change into voltage signal with this current signal, and this voltage signal is sent to electric-leakage detection circuit, electric-leakage detection circuit with the electric leakage signal that receives through filtering; amplification and rectification obtain a direct voltage and input to power switch unit P1, cut off the protected circuit power supply by the conducting realization of power switch unit P1.
But in actual applications, of short duration high frequency electric leakage can appear when fluorescent lamp starts, in order to guarantee this because this leakage circuit does not cut off the power supply, the utility model connects a capacitor C 7 between electric leakage sensor circuit and electric-leakage detection circuit, the sensor circuit that wherein leaks electricity comprises electric leakage inductor ZCT, be connected across the diode N1 and the N2 of two reverse parallel connections of electric leakage inductor ZCT voltage output end, capacitor C 6, sample resistance R3 and current-limiting resistance R2, when the voltage signal of sensing as electric leakage inductor ZCT is higher than 0.7V, play a good restraining effect by these two diodes, thereby the above voltage signal of restriction 0.7V is transferred to chip and defective chip; The effect of sample resistance R3 is that the voltage signal of electric leakage inductor induction will pass through this sample resistance, the required voltage grade is transferred to the chip the inside, thereby reaches the rated value of regulating the leakage current action; Acting as by this resistance of current-limiting resistance R2 can be limited to certain scope with the electric current of electric leakage inductor induction, thereby prevents that excessive current delivery is to the chip the inside and defective chip plays the effect of protection chip; C6 act as anti-electromagnetic interference; because the electrical type consumer goods that use are more and more now; electromagnetic radiation is very common in the middle of our daily life, because electromagnetic radiation causes the earth leakage circuit-breaker tripping operation, C6 electric capacity can be good at the signal absorption with electromagnetic radiation in order to prevent.And capacitor C 7 is to design for anti-Japanese light modulation starts specially, capacitor C 7 is a high frequency absorption electric capacity, because high frequency electric leakage signal that fluorescent start produced and electromagnetic radiation have essential distinction, the signal of electromagnetic radiation can not cause the imbalance of three electric currents, and the signal interfering frequency of electromagnetic radiation starts high many of the signal frequency produced than electric daylight lamp, so here capacitor C 6 just can not well sponge the electric leakage signal that electric daylight lamp produced, have only by increasing capacitor C 7 could well electric daylight lamp be started the short time electric leakage signal that be produced and absorb, thus the interference when having realized that anti-electric daylight lamp starts.
Electric-leakage detection circuit adopts non-time-delay residual current circuit breaker chip IC 54123, and this chip includes 8 pin, wherein, pin 1 and pin 2 are for detecting the electrical leakage voltage input, connect high frequency absorption capacitor C 7,3 pin and 8 pin are power end on these two pin, 5 pin are for latching pin, 6 pin are anti-interference (external capacitor C3 is anti-interference), and 4 pin of chip and 7 pin are output pin, and pin 4 is by capacitor C 4 ground connection, and pin 7 is used for output dc voltage and gives P1 (controllable silicon), make the P1 conducting, cut off circuit.
It should be noted that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (3)
1. one kind is used for the earth leakage protective device that anti-electric daylight lamp starts High-frequency Interference; comprise the electric leakage sensor circuit; electric-leakage detection circuit; power switch unit; described electric leakage sensor circuit links to each other with electric-leakage detection circuit; be used to respond to electric leakage signal and this current signal is changed into voltage signal and be sent to described electric-leakage detection circuit; the electric leakage signal that described electric-leakage detection circuit is used for receiving is through filtering; amplification and rectification obtain a direct voltage and input to described power switch unit; it is characterized in that: described electric-leakage detection circuit is the residual current circuit breaker chip; at two voltage input end cross-over connections, the one high frequency absorption electric capacity of described chip, the High-frequency Interference that occurs when being used for screening electron fluorescent start electric leakage.
2. the earth leakage protective device of anti-High-frequency Interference according to claim 1; it is characterized in that; described electric leakage sensor circuit comprises the electric leakage inductor and is connected across diode N1 and N2, anti-electromagnetic interference capacitor C 6, sample resistance R3 and the current-limiting resistance R2 of two reverse parallel connections of electric leakage inductor voltage output end respectively; described high frequency absorption electric capacity is capacitor C 7; one end of capacitor C 7 with connect described chip voltage input 1 pin after sample resistance R3 links to each other, capacitor C 7 other ends with connect described chip voltage input 2 pin after current-limiting resistance R2 links to each other.
3. the earth leakage protective device of anti-High-frequency Interference according to claim 1 and 2 is characterized in that, described chip is non-time-delay residual current circuit breaker chip IC 54123.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202824138U CN201584743U (en) | 2009-12-21 | 2009-12-21 | Leakage protecting device for resisting high-frequency interference when starting electronic fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202824138U CN201584743U (en) | 2009-12-21 | 2009-12-21 | Leakage protecting device for resisting high-frequency interference when starting electronic fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201584743U true CN201584743U (en) | 2010-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202824138U Expired - Fee Related CN201584743U (en) | 2009-12-21 | 2009-12-21 | Leakage protecting device for resisting high-frequency interference when starting electronic fluorescent lamp |
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| Country | Link |
|---|---|
| CN (1) | CN201584743U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186448A (en) * | 2015-10-21 | 2015-12-23 | 田子欣 | Anti-interference circuit of leakage protector |
-
2009
- 2009-12-21 CN CN2009202824138U patent/CN201584743U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186448A (en) * | 2015-10-21 | 2015-12-23 | 田子欣 | Anti-interference circuit of leakage protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20151221 |
|
| EXPY | Termination of patent right or utility model |