CN2141165Y

CN2141165Y - Intelligent electronic ballast

Info

Publication number: CN2141165Y
Application number: CN 92238474
Authority: CN
Inventors: 王孚望
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-10-22
Filing date: 1992-10-22
Publication date: 1993-08-25
Anticipated expiration: 2002-10-22

Abstract

The utility model relates to an intelligent electronic ballast for 5-40W florescent lamp, which comprises a band filter, a drive module and a sampling circuit, which is characterized in that the intelligent electronic ballast also comprises a switch circuit and a protection circuit, wherein, the switch circuit is composed of VMOS devices BG1 and BG2; the protection circuit is composed of resistors R1-R4, a capacitor C1, diodes D5, D7, a zener diode D3, an LED D6, a photodiode D4, a trigger diode D1, a voltage-sensitive resistor D2, a temperature-controlled relay Q and an electric relay J solidified into a module. The utility model has the function of over current, over pressure, overheat, lamp tube abnormality protection and ambient brightness perception automatic extinguished lamp tube, and is an electronic ballast having reliable operation and multi function. The lamp tube functions as an electronic ballast having reliable operation and multiple functions.

Description

Intelligent electronic ballast

The utility model belongs to lighting apparatus, particularly a kind of electric ballast that is applicable to the 5-40W fluorescent lamp.

At present, electric ballast miscellaneous is familiar with by the public to be better than the advantage of heritage formula ballast, wherein reasonable electric ballast is formed drive circuit by current rectifying and wave filtering circuit, oscillating circuit, make the work of fluorescent lamp starter through switching circuit, thereby start rapidly, save circuit.Also has protective circuit in some electric ballast; as: " a kind of electric ballast that has overcurrent protection function " (CN2080291), when overcurrent occurring, protective circuit makes the oscillating circuit failure of oscillation; with the protection electric ballast, but these electric ballasts mostly have the following disadvantages:

1, select for use bipolar device to do switching tube, because it is a current driving apparatus, require exciting current big, driving power is big, and device is fragile.

2, lack the protection of various abnormalities, as the protection when unusual intensification, overcurrent, overvoltage, abnormal condition of lamp tube occurring.

3, major part is the branch element circuitry, and failure rate is higher.

The purpose of this utility model is a kind of reliable operation of design, possesses the electric ballast of kinds of protect function.

The utility model is to realize like this; it comprises band pass filter; driver module; sample circuit; it also comprises switching circuit and the protective circuit of kinds of protect function is arranged; wherein switching circuit is made up of VMOS device BG1 and BG2; the grid of BG1 links to each other with driver module; the source electrode of BG1 links to each other with driver module by resistance R 5; the drain electrode of BG1 links to each other with protective circuit, and links to each other with fluorescent tube by C3, and the grid of BG2 links to each other with driver module; the drain electrode of BG2 links to each other with driver module and links to each other with the source electrode of BG1 by R5, and the source electrode of BG2 links to each other with protective circuit by R6.

According to the described protective circuit of the more detailed feature of the utility model by R1-R4; C1; diode D5, D7; voltage stabilizing didoe D3; light-emitting diode D6; photodiode D4, diac D1, piezo-resistance D2; thermostat relay Q; relay J is formed, and protective circuit is by R3, R4; the common node of J links to each other with the drain electrode of driver module and BG1; link to each other with R6 with driver module by R1, common node, D5 by R2, C1 link to each other with sample circuit, and whole devices of protective circuit are cured into a module that 5 exits are arranged.

According to further feature of the present utility model, described switching circuit BG1 and BG2 can also adopt the JGBT device.

The utility model compared with prior art; because the VMOS of employing driven or JGBT device are as switching tube; improved the reliability of circuit working; multi-functional protective circuit has automatic power-off protection function for overvoltage, overcurrent, overheated, abnormal condition of lamp tube; and when ambient brightness surpasses predetermined luminance; protective circuit also can be cut off the power supply automatically fluorescent tube is extinguished, the module of protective circuit for solidifying, thereby failure rate is low.

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is a driver module cut-away drawing of the present utility model.

Fig. 3 is a driver module outline drawing of the present utility model.

Fig. 4 is overall structure figure of the present utility model.

Describe performance of the present utility model in detail below in conjunction with accompanying drawing.

Referring to accompanying drawing 1, the utility model comprises band pass filter (1), driver module (3); the sample circuit that L, R7 form, the starting circuit that L, C4 form, it also comprises the switching circuit that BG1, BG2 form; by R1-R4, C1, diode D5, D7; voltage stabilizing didoe D3, light-emitting diode D6, photodiode D4; diac D1, piezo-resistance D2, thermostat relay Q; the protective circuit (2) that relay road J forms, the whole devices of protective circuit are cured into the module of 5 exits.

The utility model is work like this, 220 volts of civil powers are through band pass filter (1), filtering ballast high order harmonic component is to the interference of electrical network, enter driver module (3), in the module internal conversion is 300 volts of direct currents, provide driving voltage through oscillating circuit to BG1 and BG2, make BG1 and BG2 alternation, make tube starting by the series resonance of inductance L and capacitor C 4 on off state.

When abnormal condition of lamp tube (equivalent cathode resistor state), the inductance L time utmost point induces high voltage, through diode D5 rectification, make the diac conducting, relay J gets, its normally closed point disconnects, normal adhesive battle and self-insurance, red light emitting diodes D6 sends ruddiness and reports to the police, switching circuit portion dead electricity and quitting work, R7 and C1 form delay circuit, prevent to start false triggering.If supply voltage is greater than 245 volts, then piezo-resistance D2 conducting makes diac D1 conducting, repeats above actuation of an alarm.During ifs circuit temperature anomaly, the closing of contact of temperature relay Q makes the D1 conducting, repeats above actuation of an alarm.If ambient brightness surpasses predetermined value, thereby then photosensitive tube D4 resistance diminishes and triggers the D1 conducting, repeats above actuation of an alarm, and protective circuit must be opened again in case action can not restored automatically, can operate as normal.

BG1 of the present utility model and BG2 use the VMOS device, because it has very high input impedance, belong to driven, only need very little electric current to get final product work, and self temperature-compensating is arranged, there is not second breakdown, thereby improved the reliability of work, because VMOS device on state resistance is bigger, so at power of lamp tube during greater than 20W, BG1 and BG2 adopt the JGBT device, and the pipe consumption is further reduced.

In the present embodiment, 160 volts of voltage-stabiliser tube D3 Zener voltages play the protection photosensitive tube, regulate variable resistor R3 and can preset certain brightness, make the protective circuit action.

Referring to Fig. 2, the cut-away drawing of the utility model driver module (3) is shown, ac-dc converter circuit is wherein arranged, saw-tooth wave generating circuit, anti-jamming circuit, oscillating circuit, two voltage stabilizing didoes are in order to protect the two poles of the earth, VMOS device grid source.Referring to Fig. 3, the outline drawing of driver module is shown.

Referring to Fig. 4; the utility model overall structure figure is shown; all elements are installed on the base plate; by photosensitive tube (1), input filter coil (2), protective circuit module (3); red light emitting diodes (4); electrolytic capacitor filter (5), thermal relay (6), VMOS device (7); output choke (8); flame retardant plastics base plate and circuit board (9), output line (10), resonant capacitance (11); VMOS device fin (12); source resistance (13), driver module (14), abnormal condition of lamp tube state semifixed resistor (15); input filter capacitor (16); ambient brightness perception semifixed resistor (17), cartridge fuse (18), input power cord (19) is formed.

Claims

1; a kind of intelligent electric sub-ballast; comprise band pass filter; driver module; sample circuit; it is characterized in that it also comprises switching circuit and the protective circuit that the kinds of protect function is arranged; wherein switching circuit is made up of VMOS device BG1 and BG2; the grid of BG1 links to each other with driver module; the source electrode of BG1 links to each other with driver module by resistance R 5; the drain electrode of BG1 links to each other with protective circuit; and link to each other with fluorescent tube by C3; the grid of BG2 links to each other with driver module; the drain electrode of BG2 links to each other with driver module, and links to each other with the source electrode of BG1 by R5, and the source electrode of BG2 links to each other with protective circuit by resistance R 6.

2; intelligent electric according to claim 1 sub-ballast; it is characterized in that protective circuit is by resistance R 1-R4; capacitor C 1; diode D5; D7; voltage stabilizing didoe D3, light-emitting diode D6, photodiode D4; diac D1; piezo-resistance D2, thermostat relay Q, relay J is formed; protective circuit is passed through R3; R4, the common node of J links to each other with the drain electrode of driver module and BG1, by R1 and driver module; resistance R 6 links to each other; the R2 of protective circuit; the C1 common node links to each other with sample circuit by D5, and all devices of protective circuit are cured into a module that 5 exits are arranged.

3, intelligent electric according to claim 1 sub-ballast is characterized in that BG1 and BG2 can also adopt the JGBT device.