CN2138381Y

CN2138381Y - Start failure protector of electronic ballast lamp

Info

Publication number: CN2138381Y
Application number: CN 92219233
Authority: CN
Inventors: 李家伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-28
Filing date: 1992-06-28
Publication date: 1993-07-14
Anticipated expiration: 2002-06-28

Abstract

The utility model relates to a start failure protector of electronic ballast lamp, comprising a rectifying section 1, a resistance capacitance network 2, a voltage divider 3, a delaying triggering circuit 4 and a silicon-controlled switch 5. The start failure protector of electronic ballast lamp acquires the sampling voltage directly or acquires the sampling voltage from the detected branch section of the ballast LCR branch through the vibration reduction capacitance to charge the delaying capacitance, and the detected branch section can recognize the primary oscillation capacitance and can not recognize the primary oscillation inductance. Under the state of electric flux and the start failure of a lamp, a contactless switch is conducted by a triggering. The approximate short circuit of the detected branch section or an incorporation of a vibration reduction capacitance into the detected branch section makes the branch vibration reduction limit current to protect the components in the branch and a main circuit from the damages of high frequency or over current for a long time, but other branches work as usual. The utility model is convenient, flexible and safe.

Description

Start failure protector of electronic ballast lamp

The utility model is that a kind of electric ballast lamp of fluorescent lamp that is applicable to does not start protector.

Compare with inductance type ballast, electronic ballast for fluoresent lamp has efficient, energy-conservation, no buzzer, no stroboscopic sense and can low voltage starting etc. advantage.Particularly more apparent its advantage with low cost of many fluorescent tubes of machine electric ballast has universal bright prospects.But the single, multi-lamp electric ballast that has one or more LCR vibration branch road (hereinafter to be referred as the LCR branch road) usually in use remains flimsy deficiency under abnormality.Especially when the logical and lamp of certain or certain a few LCR branch roads electricity does not start, then the LCR branch road that do not start of lamp will be kept higher frequency of oscillation and electric current continues bigger than normal, thereby make the frequency of whole major loop or electric current high, cause the element thermal breakdown in the LCR branch road that major loop and lamp do not start.

Task of the present utility model is; for each LCR branch road of common single, multi-lamp electric ballast provides a kind of lamp not start protector respectively; when the logical and lamp of protector place LCR branch road electricity does not start; force place branch road vibration damping individually, thereby branch road frequency or electric current are limited in the frequency of whole major loop or electric current in the safe range.

Of the present utility model being characterised in that: have a rectification link, a resistance-capacitance network, a voltage divider, a delay trigger circuit and a gate-controlled switch, perhaps add a vibration damping electric capacity again.The rectification link directly or through vibration damping electric capacity comprises the main oscillations electric capacity that is serially connected between two filaments but oscillating voltage is detected in the highway section arbitrarily that do not comprise the main oscillations inductance at least from the LCR branch road, a plurality of LCR branch roads and main circuit power end or be connected in parallel on the power positive cathode divide equally that piezoelectricity holds between the mid point and and electronegative potential switching transistor collector electrode or drain electrode between common elements, except the pulse transformer, all can be included within the detected highway section, prop up the highway section thereby form a detected LCR who extends; The oscillating voltage that detects is sampled by a voltage divider dividing potential drop behind the rectification of rectification link, resistance-capacitance network slicing; Sampled voltage is delayed time through delay trigger circuit, and the triggering and conducting gate-controlled switch with the approximate short circuit in a highway section of being detected, is not perhaps incorporated vibration damping electric capacity into a highway section of being detected, thereby realized the vibration damping current limliting when the logical and lamp of electricity does not start.Wherein, resistance-capacitance network can save.

The utility model feature more specifically is: the rectification link is a rectifier bridge, and two input directly or be connected the two ends in detected highway section of detected highway section or extension through vibration damping electric capacity.Resistance-capacitance network is in series by resistive element and capacity cell, and the output port of resistance-capacitance network and rectifier bridge also connects.Voltage divider is in series by a resistance and a semifixed resistor, is connected in parallel on the output port of rectifier bridge.Delay trigger circuit has a charging resistor and a delay capacitor, and its charging current flows into the dividing point that end connects voltage divider, and its charging voltage negative terminal links to each other with the output negative terminal of rectifier bridge, and charging resistor wherein can be economized; Delay capacitor trigger end anodal and follow-up gate-controlled switch is between the control utmost point of one-way SCR, can be connected in series and trigger element or diode or voltage-stabiliser tube and corresponding resistive element.Gate-controlled switch is served as by an one-way SCR, and its anode connects the output plus terminal of rectifier bridge, and its negative electrode connects the output negative terminal of rectifier bridge, and its control utmost point links to each other with the positive pole of delay capacitor; , control between the utmost point and the negative electrode and can be connected an electric capacity when triggering element or diode or voltage-stabiliser tube and corresponding resistive element and be connected at the control utmost point.

Below, embodiment of the present utility model is described in conjunction with the accompanying drawings.

Do not start protector for electric ballast lamp of the present utility model in the chain-dotted line frame 6 in the accompanying drawing 1, surplusly do not start the closely related part of protector for arbitrary LCR branch road of electric ballast and lamp of the present utility model.Rectification link 1 is two of rectifier bridge input terminal A and B, respectively with the LCR branch road in detected element promptly be serially connected in filament R ₅, R ₆Between the two ends of main oscillations capacitor C be that A ' is connected with B ', perhaps with in the LCR branch road comprise C at least but the two ends that do not comprise any detected highway section of main oscillations inductance L link to each other, perhaps be connected with the two ends that the detected LCR that extends props up the highway section.Between A point and, or between B point and, perhaps between the two-end-point in A point and B point and other detected highway section, can be connected in series the vibration damping capacitor C at B ' at A ' _C(shown in Figure 2).Resistance-capacitance network 2 is by resistance R ₁And capacitor C ₁Serial connection forms, and is attempted by on the output port of rectifier bridge.Resistance-capacitance network 2 can save, and perhaps uses one by resistance R ₁' and capacitor C ₁' capacitance-resistance parallel network replacement the condition formed is that forward to be connected in series an isolating diode D(between H point and capacitance-resistance parallel network shown in Figure 3).Voltage divider 3 is by resistance R ₂With semifixed resistor R ₃Be in series, the two contact M is a dividing point, and the two ends of voltage divider 3 connect H point and E point, the dividing potential drop U on the following divider resistance respectively _MEBe sampled voltage, R ₂, R ₃Can distinguish or substitute simultaneously by thermistor, also can be respectively or serial connection or and connect thermistor simultaneously.Delay trigger circuit 4 is by resistance R ₄And capacitor C ₂Be in series, its charging current flows into termination M point, and its charging voltage negative terminal links to each other with the E point.R wherein ₄Available thermistor replaces, can be connected in series or and connect thermistor, also can save simultaneously with lead its shorted on both ends.At C ₂The trigger end of anodal F and follow-up gate-controlled switch 5 is between the control G of unidirectional controllable silicon S CR, can be connected in series to trigger element or diode or voltage-stabiliser tube and corresponding resistive element.Gate-controlled switch 5 is served as by unidirectional controllable silicon S CR, and its anode connects the H point, and its negative electrode connects the E point, control utmost point G and C ₂Anodal F link to each other.When triggering element or diode or voltage-stabiliser tube and corresponding resistive element and link to each other, SCR controls between utmost point G and the negative electrode promptly with between the E point can be connected an electric capacity at G.Do not start in the protector 6 at lamp, fixed resistance can be replaced by adjustable resistance, and semifixed resistor can be replaced by fixed resistance.

The utility model should be adjusted the resistance of semifixed resistor in the voltage divider 3 in force, makes when the lamp operate as normal sampled voltage U _METriggering level U less than unidirectional controllable silicon S CR _S, and when the logical but lamp of electricity does not start, U _MEGreater than U _SOn this basis, when the logical and lamp of electricity normally starts, at delay capacitor C ₂On voltage U _C2Reach U _SBefore, lamp is just lighted, detects voltage U _HERapid drawdown, U _MEGo down after a rise to less than U _SNumerical value, SCR does not trigger, the electric ballast operate as normal.And when the logical but lamp of electricity does not start, then LCR branch road frequency of oscillation continue higher, U _MEHigh, U _METoo high when long, through one section time-delay, U _C2Reach U _S, the SCR triggering and conducting also utilizes its on-state tube voltage drop with the approximate short circuit in a detected highway section, perhaps the vibration damping capacitor C _CIncorporate detected highway section into, make LCR branch road vibration damping current limliting, the element of protection LCR branch road and whole major loop exempts from high frequency or overcurrent cause thermal damage when long.

Claims

1, a kind of lamp of the single, multi-lamp electric ballast with one or more LCR vibration branch road that is applicable to does not start protector 6; it is characterized in that: lamp does not start protector 6 and has a rectification link 1, resistance-capacitance network 2, voltage divider 3, a delay trigger circuit 4 and a gate-controlled switch 5, perhaps also has a vibration damping capacitor C _c, rectification link 1 direct or process C _cAt least comprise from the LCR branch road and to be serially connected in filament R ₅With R ₆Between the main oscillations capacitor C and do not comprise an arbitrarily highway section of main oscillations inductance L or prop up the highway section and detect oscillating voltage from the LCR that extends, detect voltage through 1 rectification of rectification link, resistance-capacitance network 2 slicings, by the sampling of voltage divider 3 dividing potential drops, sampled voltage U _METhrough delay trigger circuit 4 time-delay, triggering and conducting gate-controlled switch 5 when the logical and lamp of electricity does not start, with detected highway section short circuit, or with C _cIncorporate detected highway section into, wherein, resistance-capacitance network 2 can save.

2, the lamp according to claim 1 does not start protector 6, it is characterized in that: rectification link 1 is served as by a rectifier bridge, the direct or process vibration damping capacitor C of two input terminal A and B _CBe connected to and comprise the main oscillations capacitor C at least in the LCR branch road and do not comprise the two ends in any detected highway section of main oscillations inductance L or the detected LCR of extension props up the two ends in highway section, a plurality of LCR branch roads and main circuit power end or be connected in parallel on the power positive cathode divide equally that piezoelectricity holds between the mid point and and electronegative potential switching transistor collector electrode or drain electrode between common elements, except the pulse transformer, the detected LCR that all can be included in extension props up within the highway section.

3, the lamp according to claim 1 does not start protector 6, it is characterized in that: resistance-capacitance network 2 is by resistance R ₁And capacitor C ₁Be in series, and be connected in parallel on the output port of rectification link 1, resistance-capacitance network 2 can be used by resistance R ₁', capacitor C ₁' capacitance-resistance the parallel network that constitutes replaces, and condition is forward to be connected in series an isolating diode D between H point and capacitance-resistance parallel network.

4, the lamp according to claim 1 does not start protector 6, it is characterized in that: voltage divider 3 is by resistance R ₂With semifixed resistor R ₃Be in series, two ends link to each other R with the output plus terminal H of rectification link 1 with output negative terminal E respectively ₂Can replace R by adjustable resistance ₃Can replace R by fixed resistance ₂, R ₃All can distinguish or replace with thermistor simultaneously, also can be respectively or simultaneously and connect or be connected in series thermistor.

5, the lamp according to claim 1 does not start protector 6, it is characterized in that: delay trigger circuit 4 has a charging resistor R ₄With a delay capacitor C ₂, its charging current flows into the dividing point M that end connects voltage divider 3, and its charging voltage negative terminal connects the output negative terminal E of rectification link 1, wherein R ₄Can be fixed resistance, can be adjustable resistance, can also be thermistor or serial connection or and connect thermistor, also can save, at C ₂Anodal F and the trigger end of follow-up gate-controlled switch 5 be between the control utmost point G of unidirectional controllable silicon S CR, can be connected in series and trigger element or diode or voltage-stabiliser tube and corresponding resistive element.

6, the lamp according to claim 1 does not start protector 6, it is characterized in that: gate-controlled switch 5 is served as by unidirectional controllable silicon S CR, and the SCR anode connects the output plus terminal H of rectification link 1, and its negative electrode connects the output negative terminal E of rectification link 1, its control utmost point G and delay capacitor C ₂Anodal F link to each other, G with trigger the situation that element or diode or voltage-stabiliser tube and corresponding resistive element be connected under, SCR controls between utmost point G and the negative electrode can be connected an electric capacity.