CN201114923Y - Relay for high-frequency circuit and electronic ballast using this relay - Google Patents

Abstract

The utility model relates to a relay used on fluorescent lamps, particularly a relay on T5 fluorescent lamps, and an electronic ballast which adopts the relay; wherein, the relay comprises a cover body, a static contact and a double metal plate which are sealed in the cover body and inert gas filled in the cover body; one end of the static contact and one end of the double metal plate respectively extract an electrode extraction end to the external part of the cover body; the two electrode extraction ends are connected with a start-up capacitance of the electronic ballast in a parallel way; when in start, as the relay is arranged, the lamp tube is preheated so as to prevent the lamp tube from being burned to be black after the lamp is rapidly lit; as the start voltage of the T5 lamp tube is higher and particularly when the T5 lamp tube is applied to a T8 or a T10 lamp seat, the lamp tube is needed to be preheated. The relay and the electronic ballast can lead the T5 fluorescent lights to be widely applied and popularized.

Description

Be used for the relay of high-frequency circuit and adopt the electric ballast of this relay

Technical field

The utility model relates to lighting field, particularly relates to the electric ballast on a kind of T5 of being applied in fluorescent lamp and is applied in relay on this electric ballast.

Background technology

At present, the daylight light fixture of selling on the market and using is roughly two kinds, a kind of is T8, T10 fluorescent lamp and supporting light fixture thereof, another kind is T5 fluorescent lamp and supporting light fixture thereof, a kind of light source product that belongs to a new generation in back, it and T8, the T10 fluorescent lamp is compared, have energy-conservation, the luminous efficiency height, the color rendering index height, advantages such as long working life, favored by people gradually, but using T8 for some, the user of T10 light fixture, as in factory, school, big place such as supermarket, want to use instead the T5 light source, because two kinds of diversified in specifications causing of lamp socket, factors such as fluorescent tube length is inconsistent, cause the T5 fluorescent tube can not directly be applied in T8, on the T10 lamp bracket, the existing several T5 of making fluorescent tubes can be applied in T8 in the prior art, transducer on the T10 lamp socket, as publication number is that 200520144489.6 Chinese utility model patent and publication number are 03231029.3 Chinese utility model patent, the thought of these two patents is to be provided with body that two plug other ends are provided with jack by an a kind of end plug of T5 fluorescent tube is inserted in the jack on this body, plug on the body is inserted T8, thereby realize T5 fluorescent tube and T8 on the T10 lamp socket, the connection of T10 lamp socket, though original T8, the T10 lamp socket still can utilize, but lamp socket need be pulled down, again change circuit, the electric ballast of packing into just can make lamp works.

Existing electric ballast comprises current rectifying and wave filtering circuit; high-frequency oscillating circuits; half-bridge drive circuit and lamp output circuit are formed; as shown in Figure 1; this kind electric ballast is applied on the T5 light fixture; when starting; city's alternating current enters through PIN1 and PIN2 through 220V/50HZ; filtering through bridge rectifier D 1～D4 and electrochemical capacitor C 1; make the alternating current of 220V become the direct current of 300V; under the situation of the powered by direct current of 300V; transistor T 1 and transistor T 2 alternations; formed a high frequency; series connection; the self-excitation resonant circuit; make direct current 300V become high-frequency alternating current; through transistor T 1; the output of transistor T 2 half-bridges; the A point has become the high frequency (voltage of 40kHZ～50kHZ); supply with fluorescent tube by choke TIB; the startup capacitor C 5 of fluorescent tube produces resonance with choke TIB; in resonance; being applied to lamp tube ends voltage VC5 is several times of half-bridge output voltages (A point voltage); QVC5 (Q is the quality factor of series resonant circuit) just; because changing of T5 fluorescent tube is thin; make the starting resistor of fluorescent tube compare T8; the starting resistor increase of T10 is a lot of, and (starting resistor of T5 lamp reaches 800V; T8; the starting resistor of T10 lamp is 400V); because this circuit of electronic ballast does not have the preheating protection function; make lamp bright once opening; belong to the cold cathode emission; very serious to the cathode injury of fluorescent tube like this; the electronics powder is splashed on the tube wall; fluorescent tube is turned black too early; shortened the life-span of fluorescent tube; and the electronic devices and components in the electric ballast have been impacted; electric ballast is damaged or the lost of life; even the T5 fluorescent tube to be applied on the existing T8/T10 lamp socket; by electric ballast of the prior art; though can start the T5 lamp; but because starting resistor is bigger; the one, owing to there is not preheating to make fluorescent tube very easily turn black, impact when another is startup and fluorescent tube be the transistor T 1 in the often easy breakdown potential sub-ballast under abnormality; thereby T2 makes whole electric ballast be damaged.

Summary of the invention

The utility model purpose is that a kind of electric ballast that has the relay of preheating and abnormity protection function and adopt this relay is provided in order to overcome the deficiencies in the prior art.

For achieving the above object, the technical solution of the utility model is: a kind of relay that is used for high-frequency circuit, it is characterized in that: it comprises cover body, be sealed in the static contact in the described cover body, be sealed in the bimetal leaf that can expand with heat and contract with cold in the described cover body, the one end other end that contacts with described static contact extends the electrode leads to client of described cover body outside, the one end other end that contacts with described bimetal leaf extends the electrode leads to client of described cover body outside, be full of the inert gas that phase ionization under high frequency voltage is arranged in the described cover body, described bimetal leaf has two operating states, first operating state is to reach or be higher than described high frequency voltage when operating voltage, described ionized inert gas produces heat, and described bimetal leaf expanded by heating contacts with described static contact; Second operating state is to be lower than described high frequency voltage when operating voltage, and described bimetal leaf shrinkage also is separated with described static contact.

Further, described cover body is the clear glass cover body.

Described inert gas is one or more the mist in helium, neon, argon gas, krypton gas, the xenon.

The utility model also provides a kind of electric ballast, comprising:

Current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit is used for converting electric main to direct current;

High-frequency oscillating circuits, described high-frequency oscillating circuits and described rectification filter circuit output end are electrically connected, and described high-frequency oscillating circuits is used for converting described direct current to high-frequency alternating current;

Half-bridge drive circuit, the output of described half-bridge drive circuit and described high-frequency oscillating circuits is electrically connected, and described half-bridge drive circuit is used to provide operating voltage;

The lamp output circuit, described lamp output circuit is connected with the output of described half-bridge drive circuit, the startup electric capacity that described lamp output circuit comprises inductance, is in series with described inductance;

Described electric ballast also comprises the relay that is used for the preheating abnormal protection, described relay comprises cover body, be sealed in the static contact in the described cover body, be sealed in the bimetal leaf that can expand with heat and contract with cold in the described cover body, the one end other end that contacts with described static contact extends the electrode leads to client of described cover body outside, the one end other end that contacts with described bimetal leaf extends the electrode leads to client of described cover body outside, be full of in the described cover body that have can be at the inert gas of setting phase ionization under the high frequency voltage, described bimetal leaf has two operating states, first operating state is to reach or be higher than described setting high frequency voltage when operating voltage, described ionized inert gas produces heat, and described bimetal leaf expanded by heating contacts with described static contact; Second operating state is to be lower than described setting high frequency voltage when operating voltage, and described bimetal leaf shrinks and is separated with described static contact; Described relay is in parallel with described startup electric capacity by two electrode leads to client and is connected.

Described cover body material is a glass.

Described inert gas is one or more the mist in helium, neon, argon gas, krypton gas, the xenon.

Described inductance is a high frequency choke coil.

When described relay is connected in parallel on startup electric capacity two ends of electric ballast, when the moment that fluorescent tube starts, because of fluorescent tube is high-impedance state, the operating voltage that starts the electric capacity two ends reaches high frequency voltage, make the ionized inert gas in the cover body, the heat that ionization produces, its inner bimetal leaf and static contact are connected, be equivalent to start electric capacity two terminal shortcircuits, the quality factor q of resonant circuit is descended, cause fluorescent tube two terminal voltages not reach required ignition voltage, so fluorescent tube can not be lighted immediately, thereby makes circuit-formed electric current flow through filament, resonance current carries out preheating to filament, treat that fluorescent tube reaches 800 ℃～1000 ℃ good emission states, the ignition voltage of fluorescent tube descends, and causes that the Q value rises, and rises to fluorescent tube and is activated, lamp is lighted, fluorescent tube drops to the normal working voltage of fluorescent tube from ignition voltage, and warm finishes, and the ionization in the cover body simultaneously stops, heat sharply reduces, and bimetal leaf separates with static contact.

When fluorescent tube unusual, chronic leakage takes place, when damaged; relay can make the normal operating voltage of voltage deviation of fluorescent tube two ends immediately; the Q value rises rapidly; the voltage of lamp tube ends reaches rapidly or is higher than high frequency voltage; the bimetal leaf of relay and static contact are connected under the ionization of inert gas, and the Q value is descended, and stop the rising of fluorescent tube two terminal voltages; prevent that electric ballast is breakdown, play the protective effect under the unusual condition of fluorescent tube.

The utility model compared with prior art; has following advantage: owing between the startup electric capacity of existing electric ballast, be parallel with relay; when lamp is activated moment; the high frequency voltage that starts between electric capacity makes the inert gas generation ionization in the relay produce heat; make the bimetal leaf expanded by heating and contact with static contact and to form the loop; the voltage of lamp tube ends will not reach required ignition voltage; resonance current flows through filament filament is carried out preheating; ignition voltage decline along with fluorescent tube; make the quality factor of resonant circuit rise; reach starting resistor; lamp is promptly lighted; realize the preheating before lamp is lighted; thereby prevent lamp from being lighted rapidly and to cause fluorescent tube to be burnt black; and this relay also has the effect that protective transistor under the situation such as unusual takes place at fluorescent tube; therefore when the electric ballast that the utility model is had relay is applied to start the T5 fluorescent lamp; the T5 fluorescent tube is carried out preheating; it is black to avoid fluorescent tube to be burnt; the phenomenon that electric ballast is burnt out, thus the popularization and application in a large number of T5 fluorescent lamp made.

Description of drawings

Accompanying drawing 1 is existing circuit of electronic ballast schematic diagram;

Accompanying drawing 2 is the structural representation of the utility model relay;

Accompanying drawing 3 is the utility model circuit of electronic ballast schematic diagram;

Wherein: 1, cover body; 2, static contact; 3, bimetal leaf; 4, electrode leads to client; 5, inert gas;

10, current rectifying and wave filtering circuit; 11, high-frequency oscillating circuits; 12, half-bridge drive circuit; 13, lamp output circuit; 14, relay;

Embodiment

Below in conjunction with accompanying drawing execution mode of the present utility model is described in detail:

Shown in the accompanying drawing 2 is the structural representation that the utlity model has the relay of preheating, abnormity protection function; this relay comprises cover body 1; this cover body 1 is the clear glass material; in cover body 1, be sealed with a conductive static contact 2 and a bimetal leaf 3; described bimetal leaf 3 has the characteristic of expanding with heat and contract with cold; in sealing cover body 1, be full of inert gas 5 is arranged; this inert gas 5 can be selected one or more the mist in helium, neon, argon gas, krypton gas, the xenon; in this preferred embodiment, inert gas 5 is the neon mist.Thereby inert gas 5 breakdown generation ionization under electric field action produces glow discharge, and this is a common practise, does not repeat them here.

And draw an electrode leads to client 4 to cover body 1 outside from static contact 2 one ends, end from bimetal leaf 3 is also drawn an electrode leads to client 4 ' to cover body 1 outside, described bimetal leaf 3 has two operating states, first operating state is to reach or be higher than set point when high frequency voltage, thereby a large amount of heats is emitted in inert gas 5 breakdown generation ionization, and bimetal leaf 3 expanded by heating contact with static contact 2; Second operating state is to be lower than set point when high frequency voltage, and bimetal leaf 3 shrinkages also are separated with described static contact 2.

Accompanying drawing 3 is for adopting the electric ballast of above-mentioned relay, this electric ballast comprises current rectifying and wave filtering circuit 10, high-frequency oscillating circuits 11, half-bridge drive circuit 12, lamp output circuit 13, wherein, current rectifying and wave filtering circuit 10 comprises the bridge rectifier be made up of diode D1, D2, D3, D4 and forms with the bridge rectifier filter capacitor C1 that is connected that is in parallel, thereby this current rectifying and wave filtering circuit 10 carries out rectification with the electric main of 200V and the a-c cycle filtering converted to the direct current of 300V by filter capacitor C1.

High-frequency oscillating circuits 11 provides dc supply by described current rectifying and wave filtering circuit 10, inductance L 2, capacitor C 7 are formed a self-oscillation, capacitor C 2, capacitor C 3 are coupling capacitance, resistance R 1, R2, R3 provide the transistor T 1 in the half-bridge drive circuit 12, the dc point of T2, choke T1A is taken from the auxiliary winding of high frequency choke coil T1B, when the T1A change in voltage, make inductance L 2, capacitor C 7 cause vibration, by the AC coupled of capacitor C 2, capacitor C 3, transistor T 1, T2 wheel are changed jobs.

Half-bridge drive circuit 12 mainly comprises transistor T 1, T2; the diode D5 that is in parallel with transistor T 1; the diode D6 that is in parallel with transistor T 2; capacitor C 8, resistance R 2 are in parallel with diode D5 respectively; described transistor T 1, T2 are power tube; diode D5, D6 are by earial drainage protective transistor T1, T2, and described half-bridge drive circuit 12 forms a high frequency voltage at the A point, also claim half-bridge output.

Lamp output circuit 13 mainly is in series and is formed by choke T1B, fluorescent tube, startup capacitor C 5; choke T1B plays the choked flow effect on the one hand; on the other hand; it forms the oscillating circuit of connecting with startup capacitor C 5; starting the relay 14 that capacitor C 5 two ends also are parallel with the preheating abnormal protection with above-mentioned all technical characterictics, two electrode leads to client of described relay 14 are in parallel with described startup capacitor C 5 two ends respectively and are connected.

The operation principle of the utility model electric ballast is as follows:

When the moment that fluorescent tube starts, because of fluorescent tube is high-impedance state, the voltage that starts capacitor C 5 two ends is very high, thereby make the neon mist ionization in the cover body 1, the heat that ionization produces expands inner bimetal leaf 3 and connects with static contact 2, be equivalent to start capacitor C 5 two terminal shortcircuits this moment, so the quality factor q of resonant circuit is descended, cause fluorescent tube two terminal voltages not reach required ignition voltage, therefore fluorescent tube can not be lighted, thereby and make resonance current flow through filament, filament is carried out preheating, treat that fluorescent tube reaches 800 ℃～1000 ℃ good emission states, the ignition voltage of fluorescent tube descends, and causes that the quality factor q value rises, and rises to fluorescent tube and is activated, lamp is lighted, fluorescent tube drops to the operating voltage of fluorescent tube from ignition voltage, thereby realizes the preheating before the lamp tube starting, and the ionization in the cover body simultaneously stops, heat sharply reduces, and bimetal leaf and static contact are separated.

And when situations such as fluorescent tube takes place unusually, chronic leakage, breakage; this relay can make the high frequency voltage of fluorescent tube two ends depart from normal operating voltage immediately; thereby the quality factor q value rises rapidly; the bimetal leaf of relay and static contact are connected under the ionization of neon mist; the quality factor q value is descended; stop the rising of fluorescent tube two terminal voltages; prevent that transistor T 1, T2 from being burnt out; thereby protected electric ballast; guarantee that this kind electric ballast can start under the prerequisite of T5 fluorescent tube, prolong the useful life of T5 fluorescent tube and electric ballast.

Circuit of electronic ballast of the present utility model is simple in structure; it is less to make product space; therefore; if the T5 fluorescent tube is applied on existing T8 or the T10 lamp socket; at the two ends of T5 fluorescent tube two conversion bodies are set removably; make conversion body add that the length of T5 fluorescent tube is identical with the length of T8 or T10 fluorescent tube; and this electric ballast is installed in the conversion body; but make T5 fluorescent tube and conversion body integrated setting like this; thereby can directly the T5 fluorescent lamp be installed on the lamp socket of T8 or T10; and because this electric ballast has the preheating abnormity protection function; make that the life-span of life-span of T5 fluorescent lamp and electric ballast is longer,, only need to change the T5 fluorescent tube and get final product when the T5 fluorescent tube is damaged when needing to change; thereby make the T5 fluorescent tube to be generalizable, save a large amount of social resources.

The foregoing description only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this, can not limit protection range of the present utility model with this.All equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection range of the present utility model.

Claims (7)

1, a kind of relay that is used for high-frequency circuit, it is characterized in that: it comprises cover body (1), be sealed in the static contact (2) in the described cover body (1), be sealed in the bimetal leaf (3) that can expand with heat and contract with cold in the described cover body (1), the one end other end that contacts with described static contact (2) extends the outside electrode leads to client (4) of described cover body (1), the one end other end that contacts with described bimetal leaf (3) extends the outside electrode leads to client (4 ') of described cover body (1), be full of the inert gas (5) that phase ionization under high frequency voltage is arranged in the described cover body (1), described bimetal leaf (3) has two operating states, first operating state is to reach or be higher than described high frequency voltage when operating voltage, described inert gas (5) ionization produces heat, and described bimetal leaf (3) expanded by heating contacts with described static contact (2); Second operating state is to be lower than described high frequency voltage when operating voltage, and (3) shrinkage of described bimetal leaf also is separated with described static contact (2).

2, the relay that is used for high-frequency circuit according to claim 1 is characterized in that: described cover body (1) is the clear glass cover body.

3, the relay that is used for high-frequency circuit according to claim 1 is characterized in that: described inert gas (5) is one or more the mist in helium, neon, argon gas, krypton gas, the xenon.

4, a kind of electric ballast comprises:

Current rectifying and wave filtering circuit (10), described current rectifying and wave filtering circuit (10) is used for converting electric main to direct current;

High-frequency oscillating circuits (11), described high-frequency oscillating circuits (11) is electrically connected with described current rectifying and wave filtering circuit (10) output, and described high-frequency oscillating circuits (11) is used for converting described direct current to high-frequency alternating current;

Half-bridge drive circuit (12), described half-bridge drive circuit (12) is electrically connected with the output of described high-frequency oscillating circuits (11), and described half-bridge drive circuit (12) is used to provide operating voltage;

Lamp output circuit (13), described lamp output circuit (13) is connected with the output (A) of described half-bridge drive circuit (12), the startup electric capacity (C5) that described lamp output circuit comprises inductance (T1B), is in series with described inductance (T1B);

It is characterized in that: described electric ballast also comprises the relay (14) that is used for the preheating abnormal protection, described relay (14) comprises cover body (1), be sealed in the static contact (2) in the described cover body (1), be sealed in the bimetal leaf (3) that can expand with heat and contract with cold in the described cover body (1), the one end other end that contacts with described static contact (2) extends the outside electrode leads to client (4) of described cover body (1), the one end other end that contacts with described bimetal leaf (3) extends the outside electrode leads to client (4 ') of described cover body (1), be full of the inert gas (5) that phase ionization under high frequency voltage is arranged in the described cover body (1), described bimetal leaf (3) has two operating states, first operating state is to reach or be higher than described high frequency voltage when operating voltage, described inert gas (5) ionization produces heat, and described bimetal leaf (3) expanded by heating contacts with described static contact (2); Second operating state is to be lower than described high frequency voltage when operating voltage, and described bimetal leaf (3) shrinks and is separated with described static contact (2); Described relay (14) is in parallel with described startup electric capacity (C5) by two electrode leads to client (4,4 ') and is connected.

5, electric ballast according to claim 4 is characterized in that: described cover body (1) is the clear glass cover body.

6, electric ballast according to claim 4 is characterized in that: described inert gas (5) is one or more the mist in helium, neon, argon gas, krypton gas, the xenon.

7, electric ballast according to claim 4 is characterized in that: described inductance (TIB) is a high frequency choke coil.

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