CN2119073U - Electronic ballast of high voltage gas discharge lamp - Google Patents

Abstract

The utility model relates to an electronic ballast of a high voltage gas discharge lamp, comprising an input filtering and protection circuit, a high-frequency oscillation switching circuit, a high voltage trigger, a high voltage triggering turn-off circuit, and a choke coil. The high voltage gas discharge lamp is used as the load of the electronic ballast; first, the high voltage trigger generates high voltage pulse to start the lamp; then, the high-frequency oscillation switching circuit provides high-frequency current to the lamp; after the lamp starts, the high voltage triggering turn-off circuit turns off the high voltage trigger; the choke coil gets the lamp to operate stably by current limiting. The utility model has the advantages of small size, light weight, low power consumption, metallic material saving, high power factor, and good starting performance.

Description

Electronic ballast of high voltage gas discharge lamp

The utility model relates to a kind of electronic ballast for high-pressure discharge lamp.

Prior art mesohigh gaseous discharge lamp all adopts frequency inductance formula ballast, in case the burning of lamp, and keep the steady operation of lamp.This ballast expends a large amount of silicon steel sheets and enamel covered wire, and volume is big, Heavy Weight, and power consumption is big, and power factor is low, and startability is poor, uses inconvenience.

The purpose of this utility model provides a kind of electric ballast, to solve above-mentioned the deficiencies in the prior art, reaches energy-conservation, consume silicon steel disc not, and volume is little, and is in light weight, improves purposes such as power factor.

The purpose of this utility model is achieved in that the filter that adopts electronic circuit; rectifier filter; high-voltage trigger; the high pressure trigger turn-off circuit; higher-order of oscillation switching circuit; electric ballast is partly formed in protection and output; producing high-voltage pulse by high-voltage trigger earlier lights gas breakdown in the lamp; lamp is started; higher-order of oscillation switch provides high-frequency current to lamp then; by exporting the work that choke is partly stablized lamp; lamp starts back high pressure trigger turn-off circuit high-voltage trigger is turn-offed; no longer produce high-voltage pulse at the lamp duration of work, filter is that the reverse radio-frequency that prevents the higher-order of oscillation is crosstalked, and rectifier filter then provides the galvanic current source for oscillating switch circuit.Owing to adopted high-frequency circuit, the ballast volume is reduced, weight saving, power consumption descends, and has improved power factor, has saved metal material.

With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in detail.

Fig. 1 is the utility model electrical schematic diagram.

Fig. 2 is the structural representation of transformer B1 among the utility model embodiment, transformer B3, choke L.

As shown in Figure 1; the utility model is made up of six partial circuits; (1) by piezo-resistance R1; fuse RD; capacitor C 1; C2; inductance L 1 is formed surge protection; the input common-mode filter that insurance and anti-high frequency are played a reversed role; 220 volt of 50 hz AC power supply of its input termination; (2) by diode D3; D4; D5; D6; capacitor C 3; resistance R 2 is formed bridge rectifier filter circuit; (3) by triode BG1; BG2; diode D7; D8; D9; D10; resistance R 3; R4; R5; R6; R7; R8; capacitor C 4; C5; C6; C7; transformer B2; choke L forms higher-order of oscillation switching circuit; R3 wherein; D8; C4 constitutes saw-toothed wave generator; to produce the required starting of oscillation signal of oscillating switch circuit vibration; C6 is connected with L by load lamp 1; frequency-selective network with L formation oscillating circuit; the elementary of transformer B2 is N20; secondary is N21; two groups of coils of N22; (4) by diode D1; D2; controllable silicon BG4; resistance R 10; R11; R12; R13; capacitor C 8; C9; transformer B1 forms high-voltage trigger; wherein B1 is a high voltage pulse transformer; it is elementary to be N11; secondary for N12(be choke L); (5) by triode BG3; resistance R 14; R15; R16; transformer B3 forms the high pressure trigger turn-off circuit; wherein B3 is for turn-offing feedback transformer; its elementary for N31(be choke L); secondary is N32; (6) piezo-resistance R9; choke L forms output circuit; its D; the J two ends are output, with the G of load lamp 1; the H two ends link to each other respectively.Behind the power connection, a part enters filter rectifier, and another part enters high-voltage trigger by the K point.Produce about 300 volts of direct voltages through the supply voltage behind filtering, the rectifying and wave-filtering between A, C, E point current potential is 150 volts.Direct voltage charges to C4 by R3, when the last voltage of C4 surpasses the conducting voltage of D8, the D8 conducting, the C4 electric charge discharges by D8, make the BG2 conducting, this charge and discharge process of C4 does not carry out when higher-order of oscillation switching circuit is worked repeatedly, has just produced the required sawtooth signal of a series of higher-order of oscillation switching circuit starting of oscillation at the B point; When G, the H of lamp 1 end does not link to each other with D, J end, though or link to each other and lamp 1 when not starting, though sawtooth signal makes BG2 repeat conducting, but because of presenting open circuit between D, the J, C6, L do not constitute the frequency-selective network of a sealing, and no current flows through among the coil N20 simultaneously, and B2 does not have the effect of recommending, thereby oscillating switch circuit is not worked no high-frequency current generation.Simultaneously, enter the halfwave rectifier of the supply voltage of high-voltage trigger through D1, positive half cycle in each cycle of input ac power, charge to C8, C9 by R10, diac D2 conducting when Q point current potential reaches certain value, the C9 electric charge is by the control utmost point discharge of D2, R13, BG4, make the BG4 conducting, this moment, the C8 electric charge was by N11, BG4 discharge, the pulse current that flows through among the N11 induces thousands of volt high-voltage pulses on B1 level N12, this high-voltage pulse descends the resistance of piezo-resistance R9 rapidly, thereby by G, the H end that R9 is added to lamp 1, lamp 1 is started light.Though when lamp 1 does not connect or connects and starts when lighting, because of no high-frequency current produces, the secondary N32 of transformer B3 responds to less than feedback signal, the high pressure trigger turn-off circuit is inoperative, and the high-voltage trigger continuous operation produces continuous high-voltage pulse; After lamp 1 connects and is activated, C6, L constitute the frequency-selective network of a sealing by lamp 1, under the effect of starting of oscillation sawtooth signal, oscillating switch circuit is started working, the primary and secondary end of the same name relation of B1 guarantee BG1, BG2 take turns conducting, end, produce square wave oscillation, substantially by the parameter decision of frequency-selective network, the high-frequency current that this vibration produces offers lamp 1 to frequency of oscillation, and L promptly plays the choke effect, the restriction lamp current increases the work of stablizing lamp.After the higher-order of oscillation begins owing to the quick conducting of BG2, end, the collection of C4 electric charge by D7, BG2, emitter-base bandgap grading fast, discharge repeatedly, D8 can not get the conducting required voltage, B point no longer exists the sawtooth waveforms generation.When the higher-order of oscillation produces, the high-frequency current that flows through among the elementary N31 of B3 makes secondary N32 respond to a high frequency voltage, as feedback signal, be added to the base stage of BG3 by R16, make BG3 with the quick conducting of same frequency, end, the C9 electric charge is constantly discharged by collection, the emitter-base bandgap grading of R14, BG3, Q point current potential is suppressed, and D2 is conducting no longer, and BG4 can not get the i.e. no longer conducting of trigger current, therefore high-voltage trigger no longer produces high-voltage pulse, that is is turned off.This process starts back moment at lamp to be finished, and guaranteed no longer to be subjected to impacting with high pressure after the lamp work, thereby the life-span that guarantees lamp 1 is unaffected.After lamp 1 started, the R9 both end voltage descended, and the R9 resistance reverts to infinity rapidly, and no longer conducting does not influence the work of lamp.

The utility model electric ballast, its transformer B1, B3, choke L be for to make around three groups of coils on a secondary ferrite magnetic core material, wherein the double secondary N12 of B1 and the elementary N31 of B3 of being of L.The model of magnetic core has multiple, and a kind of transformer B1, B3 and choke L that adopts the normal ferrite magnetic core to manufacture is provided among the embodiment, selection standard EI type magnetic core one pair, and it is made up of an E type magnetic core and an I type magnetic stripe, makes transformer as shown in Figure 2.Be wound with coil 3,4,5,3,5 on the center bar magnet of magnetic core 2 successively and be respectively N11 and the N12 of B1,5,4 are respectively N31 and the N32 of B3, the 5 double choke L that are; Leave an air gap 7 between magnetic core 2 and the magnetic stripe 6, the effect of this air gap is to prevent that magnetic core is saturated, and is guaranteeing to guarantee under the certain situation of coil 3,4,5 number of turns that the inductance value of coil 5 is fit to the requirement and the chokes requirement of frequency of oscillation; Tight with the stacker pad between the air gap, its effect is after magnetic core 2 and magnetic stripe 6 are fixed, and guarantees that magnetic core is relative with magnetic stripe tight, and is unlikely loosening, thereby guarantees that air gap is constant, just guaranteed that also the sensibility reciprocal of L is constant.When high-voltage trigger was worked, the pulse current that flows through in the coil 3 as N11 was responded to generation one high-voltage pulse in as the coil 5 of N12, and this high pressure promptly is added to the two ends of load lamp 1, so that lamp starts; After lamp is activated, produce the higher-order of oscillation, flow through high-frequency current in the coil 5 as L and N31, on as the coil 4 of N32, respond to a high-frequency signal, this signal promptly turn-offs high Hair Fixer tentaculum as turn-offing feedback signal, no longer produce high-voltage pulse, coil 5 limits the growth of lamp current simultaneously, stablizes the work of lamp.As seen, though do not connect or connect and lamp when not starting when lamp, do not have high-frequency current in the coil 5, do not turn-off feedback signal on the coil 4, high-voltage trigger is with continuous firing.

The utility model electric ballast adopts high-frequency circuit, can replace traditional electrical sense ballast, compared with prior art, it is little to have volume, in light weight, low in energy consumption, the power factor height, startability is good, does not consume the advantage of heavy metal, and is easy to use and integrated with light fixture.

Test shows that the utility model electric ballast power factor is greater than 0.6, and power consumption is lower than 30% of Inductive ballast.

Claims (7)

1, the electric ballast that is used for high-voltage gas discharging light is characterized in that being made up of input filtering and protective circuit, current rectifying and wave filtering circuit, higher-order of oscillation switching circuit, high-voltage trigger, high pressure trigger turn-off circuit, output circuit.

2, electric ballast according to claim 1 is characterized in that importing filtering and protective circuit and is made up of C1, C2, L1, R1, RD; C1, C2, L1 constitute the common mode filtering circuit, and piezo-resistance R1 and fuse RD constitute surge protection, insurance circuit; L1 is made on same magnetic core by two groups of coils.

3, electric ballast according to claim 1 is characterized in that higher-order of oscillation switching circuit is made up of BG1, BG2, D7, D8, D9, D10, R3, R4, R5, R6, R7, R8, C4, C5, C6, C7, B2, L; The primary coil of transformer B2 is N20, and secondary coil is N21, N22; One end of capacitor C 6 links to each other with the D point, and the end of the other end and N20 is with being connected to the E point; The end of the other end of N20 and L is connected in the F point; The other end J of L is the output that links to each other with the H end of lamp 1.

4, electric ballast according to claim 1 is characterized in that high-voltage trigger is made up of D1, D2, BG4, R10, R11, R12, R13, C8, C9, B1, is connected to K, C two ends; The primary coil of transformer B1 is N11, and secondary coil is N12; The anode of D1 is connected to the K point, and negative electrode links to each other with R10

5, electric ballast according to claim 1 is characterized in that the high pressure trigger turn-off circuit is made up of BG3, R14, R15, R16, B3; The primary coil of transformer B3 is N31, and secondary coil is N32; One end of resistance R 14 links to each other with the collector electrode of BG3, and the other end is connected to the Q point, links with high-voltage trigger; In parallel with base, the emitter-base bandgap grading of R15 and BG3 after N32 connects with R16, the common joint of the emitter-base bandgap grading of BG3 and R15, N32 is with being connected to the C point.

6, electric ballast according to claim 1 is characterised in that output circuit is made up of R9, L; R9 is a piezo-resistance, and one is terminated at the common junction D of C5, C6, C7, and the other end is connected to the elementary N20 of B2 and the tie point F of L; The J end of L is an output with the D end, links to each other with H, the G two ends of load lamp 1.

7,, be characterised in that transformer B1, transformer B3, choke L are made on same secondary magnetic core by three groups of coils according to claim 1 or 3 or 4 or 5 or 6 described electric ballasts; Wherein the elementary N31 of secondary N12, the B3 of B1, choke L are same group of coil.

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