CN1630451A - Lamp life detection and protection apparatus - Google Patents

Abstract

This invention refers to a lamp service life check and protective device, which contains lamp tube, semi bridge driver for driving lamp tube, capacitor and inductor set between lamp tube and semi bridge driver, capacitor connected between lamp two ends, a lamp service life sampler connected with lamp tube for checking voltage of lamp tube, an electronic rectifier control IC receiving the voltage of lamp tube sent from electronic rectifier control IC and sending a control signal to semi bridge driver to control its work after comparing to obtain checking and protecting lamp service life.

Description

The detection in lamp longevity and protective device

Technical field

The present invention relates to a kind of electronic ballast for fluoresent lamp equipment, relate in particular to a kind of detection and protective device that is applicable to the lamp longevity on the electronic ballast for fluoresent lamp that lamp longevity defencive function need be provided.

Background technology

When the end-of-life of fluorescent lamp tube, owing to the decline of tube cathode emitting electrons ability enters asymmetric operating state (being commonly called as the rectification attitude), the filament of fluorescent tube is owing to over hot melting is splashed on the lamp tube wall at this moment, cause tube glass to burst or burn the danger of ballast therefrom, even cause injury human body.

Summary of the invention

The object of the present invention is to provide the detection and the protective device in a kind of lamp longevity, it can detect the asymmetric operating state of fluorescent tube when lamp tube service life finishes, thereby in time turn-offs ballast, avoids taking place the danger that fluorescent tube burst or burnt ballast.

The object of the present invention is achieved like this:

The detection in a kind of lamp longevity and protective device comprise: fluorescent tube, and the half-bridge driver of driving fluorescent tube is arranged on capacitor C 1 and inductance L 1 between fluorescent tube and the half-bridge driver, is connected the capacitor C 2 between fluorescent tube E end and the F end; Be characterized in also comprising:

One lamp longevity sampler, this lamp longevity sampler is connected with fluorescent tube, is used to detect the pipe pressure of fluorescent tube;

One electron rectifier control integrated circuit, the voltage of the lamp tube ends that this electron rectifier control integrated circuit receiving light longevity sampler is sent here is sent a control signal to half-bridge driver, with the work of control half-bridge driver after relatively.

In the detection and protective device in above-mentioned lamp longevity, wherein, described lamp longevity sampler comprises bleeder circuit and coupling circuit; Bleeder circuit is formed by being arranged on the resistance R el1 and the Rel2 of fluorescent tube E end with the F end; Coupling circuit is made up of capacitor C el1, and the end of capacitor C el1 is connected between divider resistance Rel1 and the Rel2, and the other end is delivered to the C point of electron rectifier control integrated circuit.

In the detection and protective device in above-mentioned lamp longevity, wherein, described lamp longevity sampler comprises bleeder circuit and filter circuit; Bleeder circuit is made up of the resistance R el1 and the Rel2 that are arranged between fluorescent tube F end and the ground connection; Filter circuit is made up of capacitor C el1, and this filter capacitor Cel1 and divider resistance Rel2 are connected in parallel.

In the detection and protective device in above-mentioned lamp longevity, wherein, described lamp longevity sampler comprises bleeder circuit, filter circuit and biasing circuit; Bleeder circuit is formed by being arranged on the resistance R el1 and the Rel2 of fluorescent tube E end with the F end; Filter circuit is made up of capacitor C el1, and this filter capacitor Cel1 and divider resistance Rel2 are connected in parallel; Biasing circuit is made of biasing resistor Rel3, and the end of this biasing resistor Rel3 is connected with power supply, and the other end is connected with filter capacitor Cel1.

The detection in lamp longevity of the present invention and protective device owing to adopted above-mentioned technical scheme, make it compared with prior art, have significant advantage and good effect.The present invention is owing to be provided with the lamp longevity sampler of a detection lamp tube status in the fluorescent tube connection; lamp longevity sampler with detected fluorescent tube pipe force feed to lamp longevity sampler; by delivering to the signal of electron rectifier control integrated circuit after the lamp longevity sampler; perhaps positive peak is higher than V1; perhaps negative peak is lower than V2, all can make the action of electron rectifier control integrated circuit, sends control signal D; turn-off half-bridge driver, thereby finish the detection and the defencive function in lamp longevity.

Description of drawings

By following to the lamp of the present invention longevity detection and some embodiment of protective device in conjunction with the description of its accompanying drawing, can further understand purpose of the present invention, specific structural features and advantage.Wherein, accompanying drawing is:

Fig. 1 is the detection in lamp longevity of the present invention and the circuit block diagram of protective device;

Fig. 2 is the detection in lamp longevity of the present invention and the electrical schematic diagram of protective device first embodiment;

Fig. 3 is the voltage oscillogram of A among Fig. 2, B, C each point;

Fig. 4 is the current waveform figure of each state of fluorescent tube among Fig. 2;

Fig. 5 is the detection in lamp longevity of the present invention and the electrical schematic diagram of protective device second embodiment;

Fig. 6 is the voltage oscillogram of A among Fig. 5, B, C each point;

Fig. 7 is the current waveform figure of each state of fluorescent tube among Fig. 5;

Fig. 8 is the detection in lamp longevity of the present invention and the electrical schematic diagram of protective device the 3rd embodiment;

Fig. 9 is the voltage oscillogram of A among Fig. 8, B, C each point;

Figure 10 is the current waveform figure of each state of fluorescent tube among Fig. 8.

Embodiment

See also shown in Figure 1ly, this is the detection in lamp longevity of the present invention and the circuit block diagram of protective device.The detection and the protective device in a kind of lamp longevity of the present invention comprise: fluorescent tube 1, and the half-bridge driver 2 of driving fluorescent tube 1 is arranged on capacitor C 1 and inductance L 1 between fluorescent tube 1 and the half-bridge driver 2, is connected the capacitor C 2 between fluorescent tube 1E end and the F end; Also comprise: a lamp longevity sampler 3, this lamp longevity sampler 3 is connected with fluorescent tube 1, is used to detect the pipe pressure of fluorescent tube 1; One electron rectifier control integrated circuit 4, the voltage at fluorescent tube 1 two ends that this 4 receiving light longevity of electron rectifier control integrated circuit sampler 3 is sent here is sent a control signal to half-bridge driver 2, with the work of control half-bridge driver 2 after relatively.

See also Fig. 2 to shown in Figure 4, they are the detection in lamp longevity of the present invention and electrical schematic diagram, voltage and the current waveform figure oscillogram of protective device first embodiment.As shown in Figure 2, in the present embodiment, the detection in lamp longevity of the present invention and protective device be by fluorescent tube 1, half-bridge driver 2, electron rectifier control integrated circuit 4, lamp longevity sampler 3, and inductance L 1, capacitor C 1, C2 are formed; The voltage at fluorescent tube 1 two ends that this 4 receiving light longevity of electron rectifier control integrated circuit sampler 3 is sent here is sent a control signal to half-bridge driver 2, with the work of control half-bridge driver 2 after relatively.Half-bridge driver 2, fluorescent tube 1, inductance L 1, capacitor C 1, C2 are the composition module of ordinary electronic ballast; Lamp longevity sampler 3 comprises bleeder circuit and coupling circuit; Bleeder circuit is formed by being arranged on the resistance R el1 and the Rel2 of fluorescent tube 1E end with the F end; Coupling circuit is made up of capacitor C el1, and the end of capacitor C el1 is connected between divider resistance Rel1 and the Rel2, and the other end is delivered to the C point of electron rectifier control integrated circuit 4; Lamp longevity sampler 3 and electron rectifier control integrated circuit 4 are finished lamp longevity defencive function jointly.

Please in conjunction with Fig. 2 referring to shown in Figure 3, the operation principle of present embodiment is:

Lamp longevity sampler 3 adopt the pipe of fluorescent tube 1 press (A point) earlier through divider resistance Rel1 and Rel2 dividing potential drop (B point), deliver to electron rectifier control integrated circuit 4 (C point) by coupling capacitance Cel1 then; Electron rectifier control integrated circuit 4 has a Upper threshold voltage V1, a lower threshold voltage V2, and a direct voltage V3 is provided simultaneously $(\mathrm{<figure-callout\; id="3"\; label="V"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">V</figure-callout>}3=\frac{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">V</figure-callout>}1+\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">V</figure-callout>}2}{2})$ Offer the C point as biasing;

The effect of electron rectifier control integrated circuit 4 is: in case the voltage Vc that C is ordered is higher than Upper threshold V1 or is lower than Lower Threshold V2,4 actions of electron rectifier control integrated circuit, export a high level and give half-bridge driver 2 (D point), half-bridge driver is quit work.

Please in conjunction with Fig. 2 referring to shown in Figure 4, in the present embodiment, each state of fluorescent tube 1 is,

When fluorescent tube 1 is in normal operating conditions (before the end of lamp longevity), the C point voltage is to be the laterally zygomorphic sine wave in center (shown in Fig. 4 a) with V3, and amplitude can not surpass upper and lower thresholding V1, V2;

When fluorescent tube 1 end-of-life, the pipe of fluorescent tube 1 presses (A point voltage) to change, and is divided into following three kinds of situations:

(1) go up the end of negative electrode (filament E) lamp longevity: this moment, the positive peak of A point voltage increased, and caused C point voltage peak-to-peak value to increase (shown in Fig. 4 b);

(2) following negative electrode (filament F) the lamp longevity finishes: this moment, the negative peak of A point voltage increased, and caused C point voltage peak-to-peak value to increase (shown in Fig. 4 c);

(3) the cathode modulation longevity finishes simultaneously up and down: this moment, the positive and negative peak value of A point voltage increased simultaneously, caused C point voltage peak-to-peak value to increase (shown in Fig. 4 d).

For above three kinds of situations; all can increase by the peak-to-peak value of delivering to the signal (C point voltage) of electron rectifier control integrated circuit 4 after the lamp longevity sampler 3; perhaps positive peak is higher than V1; perhaps negative peak is lower than V2; thereby make 4 actions of electron rectifier control integrated circuit; send control signal D, turn-off half-bridge driver 2, finish lamp longevity defencive function.

See also Fig. 5 to shown in Figure 7, they are the detection in lamp longevity of the present invention and electrical schematic diagram and voltage and the current waveform figure oscillogram of protective device second embodiment.As shown in Figure 5, in the present embodiment, the detection in lamp longevity of the present invention and protective device be by fluorescent tube 1, half-bridge driver 2, electron rectifier control integrated circuit 4, lamp longevity sampler 3, and inductance L 1, capacitor C 1, C2 are formed; Lamp longevity sampler 3 comprises bleeder circuit and filter circuit; Bleeder circuit is made up of the resistance R el1 and the Rel2 that are arranged between fluorescent tube 1F end and the ground connection; Filter circuit is made up of capacitor C el1, and this filter capacitor Cel1 and divider resistance Rel2 are connected in parallel; Lamp longevity sampler 3 and electron rectifier control integrated circuit 4 are finished lamp longevity defencive function jointly.

Please in conjunction with Fig. 5 referring to shown in Figure 6, the operation principle of present embodiment is:

Lamp longevity sampler 3 adopt fluorescent tube 1 loop in voltage (A point) on the partiting dc capacitor C1, earlier through divider resistance Rel1 and Rel2 dividing potential drop, and deliver to electron rectifier control integrated circuit 4 (B point) after alternating current component is removed in filtering through filtering capacitor C el1; Electron rectifier control integrated circuit 4 has a Upper threshold voltage V1, a lower threshold voltage V2, and a direct voltage V3 is provided simultaneously $(\mathrm{<figure-callout\; id="3"\; label="V"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">V</figure-callout>}3=\frac{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">V</figure-callout>}1+\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">V</figure-callout>}2}{2})$ Offer the B point as biasing,, make that the voltage Vb that B is ordered just equals V3 when the A point voltage is Vnormal by regulating the ratio of resistance R el1 and Rel2 $(\frac{\mathrm{<figure-callout\; id="2"\; label="Rel"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">Rel</figure-callout>}2}{\mathrm{<figure-callout\; id="1"\; label="Rel"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">Rel</figure-callout>}1+\mathrm{<figure-callout\; id="2"\; label="Rel"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">Rel</figure-callout>}2}\mathrm{Vnormal}=V3);$

The effect of electron rectifier control integrated circuit 4 is: in case the voltage Vb that B is ordered is higher than Upper threshold V1 or is lower than Lower Threshold V2,4 actions of electron rectifier control integrated circuit, export a high level and give half-bridge driver 2 (D point), half-bridge driver 2 is quit work.

Please in conjunction with Fig. 5 referring to shown in Figure 7, in the present embodiment, each state of fluorescent tube 1 is,

When fluorescent tube 1 is in normal operating conditions (before the end of lamp longevity), the A point voltage is the sine wave of a symmetry, and DC component=Vnormal is not so B point voltage Vb=V3 (shown in Fig. 7 a) can surpass upper and lower thresholding V1, V2;

When fluorescent tube 1 end-of-life, fluorescent tube 1 enters the rectification attitude, and its pipe presses (A point voltage) to change, and is divided into following two kinds of situations:

(1) go up the end of negative electrode (filament E) lamp longevity: this moment, the positive peak of A point voltage increased, and its DC component＞Vnormal causes the B point voltage to increase, Vb＞Upper threshold voltage V1, (shown in Fig. 7 b);

(2) following negative electrode (filament F) the lamp longevity finishes: this moment, the negative peak of A point voltage increased, and its DC component＜Vnormal causes the B point voltage to reduce Vb＜lower threshold voltage V2, (shown in Fig. 7 c).

For above two kinds of situations; by delivering to the signal (B point voltage) of electron rectifier control integrated circuit 4 or be higher than V1 after the lamp longevity sampler 3; perhaps reduce and be lower than V2; thereby make 4 actions of electron rectifier control integrated circuit; send control signal D; turn-off half-bridge driver 2, finish lamp longevity defencive function.

See also Fig. 8 to shown in Figure 10, they are the detection in lamp longevity of the present invention and electrical schematic diagram and voltage and the current waveform figure oscillogram of protective device the 3rd embodiment.As shown in Figure 8, in the present embodiment, the detection in lamp longevity of the present invention and protective device are made up of fluorescent tube 1, half-bridge driver 2, electron rectifier control integrated circuit 4, lamp longevity sampler 3 and inductance L 1, capacitor C 1, C2; Lamp longevity sampler 3 comprises bleeder circuit, filter circuit and biasing circuit; Bleeder circuit is formed by being arranged on the resistance R el1 and the Rel2 of fluorescent tube 1E end with the F end; Filter circuit is made up of capacitor C el1, and this filter capacitor Cel1 and divider resistance Rel2 are connected in parallel; Biasing circuit is made of biasing resistor Rel3, and the end of this biasing resistor Rel3 is connected with power supply, and the other end is connected with filter capacitor Cel1; Lamp longevity sampler 3 and electron rectifier control integrated circuit 4 are finished lamp longevity defencive function jointly.

Please in conjunction with Fig. 8 referring to shown in Figure 9, the operation principle of present embodiment is:

Lamp longevity sampler 3 adopt the pipe of fluorescent tube 1 press (A point) earlier through divider resistance Rel1 and Rel2 dividing potential drop, deliver to electron rectifier control integrated circuit 4 (B point) after removing alternating current component by filter capacitor Cel1 filtering then; Electron rectifier control integrated circuit 4 has a Upper threshold voltage V1, a lower threshold voltage V2, and a direct voltage V3 is provided simultaneously $(\mathrm{<figure-callout\; id="3"\; label="V"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">V</figure-callout>}3=\frac{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">V</figure-callout>}1+\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">V</figure-callout>}2}{2})$ Offer the B point as biasing; The effect of biasing resistor Rel3 is to provide a direct current biasing to the B point by VCC, makes when the A point voltage is zero the B point voltage $\mathrm{Vb}=V3(\frac{\mathrm{<figure-callout\; id="1"\; label="Rel"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">Rel</figure-callout>}1*\mathrm{<figure-callout\; id="2"\; label="Rel"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">Rel</figure-callout>}2}{\mathrm{<figure-callout\; id="1"\; label="Rel"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">Rel</figure-callout>}1*\mathrm{<figure-callout\; id="2"\; label="Rel"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">Rel</figure-callout>}2+\mathrm{<figure-callout\; id="1"\; label="Rel"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">Rel</figure-callout>}1*\mathrm{<figure-callout\; id="3"\; label="Rel"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">Rel</figure-callout>}3+\mathrm{<figure-callout\; id="2"\; label="Rel"\; filenames="A20031010938900101.png,A20031010938900151.png"\; state="\{\{state\}\}">Rel</figure-callout>}2*\mathrm{<figure-callout\; id="3"\; label="Rel"\; filenames="A20031010938900101.png"\; state="\{\{state\}\}">Rel</figure-callout>}3}*\mathrm{VCC}=V3);$

The effect of electron rectifier control integrated circuit 4 is: in case the voltage Vb that B is ordered is higher than Upper threshold V1 or is lower than Lower Threshold V2,4 actions of electron rectifier control integrated circuit, export a high level and give half-bridge driver 2 (D point), half-bridge driver 2 is quit work.

Please in conjunction with Fig. 8 referring to shown in Figure 10, in the present embodiment, each state of fluorescent tube 1 is,

When fluorescent tube 1 is in normal operating conditions (before the end of lamp longevity), the A point voltage is the sine wave of a symmetry, and DC component=0 is not so B point voltage Vb=V3 (as Figure 10 a), can surpass upper and lower thresholding V1, V2;

When fluorescent tube 1 end-of-life, fluorescent tube 1 enters the rectification attitude, and its pipe presses (A point voltage) to change, and is divided into following two kinds of situations:

(1) go up the end of negative electrode (filament E) lamp longevity: this moment, the positive peak of A point voltage increased, and its DC component＞0 causes the B point voltage to increase, Vb＞Upper threshold voltage V1, (shown in Figure 10 b).

(2) following negative electrode (filament F) the lamp longevity finishes: this moment, the negative peak of A point voltage increased, and its DC component＜0 causes the B point voltage to reduce Vb＜lower threshold voltage V2, (shown in Figure 10 c).

For above three kinds of situations; by delivering to the signal (B point voltage) of electron rectifier control integrated circuit 4 or be higher than V1 after the lamp longevity sampler 3; perhaps reduce and be lower than V2; thereby make 4 actions of electron rectifier control integrated circuit; send control signal D; turn-off half-bridge driver 2, finish lamp longevity defencive function.

In the present invention, described electron rectifier control integrated circuit 4 is made of comparison amplifier.

In above-mentioned three embodiment, wherein, first embodiment, the asymmetric operating state that had occurred in the time of both can having detected fluorescent tube 1 end-of-life (rectification attitude) can detect again that cathode modulation longevity up and down finishes simultaneously and the rising of fluorescent tube 1 voltage symmetry that causes; Second, third embodiment, the asymmetric operating state that occurs when only detecting fluorescent tube 1 end-of-life (rectification attitude), insensitive for the symmetry variation of fluorescent tube 1 voltage.

Because the light tube electric voltage of the fluorescent tube 1 that different manufacturers is produced is different, but it but is common entering the rectification attitude phenomenon that the later stage in lamp longevity occurred, so first embodiment is applicable to the lamp longevity protection of the electric ballast of supporting preset parameter (light tube electric voltage) fluorescent tube; Second, third embodiment is applicable to the lamp longevity protection of the electric ballast of supporting on-fixed parameter (light tube electric voltage) fluorescent tube.

In sum; the detection in lamp longevity of the present invention and protective device are owing to be provided with the lamp longevity sampler of a detection lamp tube status in the fluorescent tube connection; lamp longevity sampler with detected fluorescent tube pipe force feed to the electron rectifier control integrated circuit; processing by the electron rectifier control integrated circuit; send control signal D; the work or the shutoff of control half-bridge driver, thus the detection and the defencive function in lamp longevity finished.

Claims (4)

1. the detection in a lamp longevity and protective device comprise: fluorescent tube (1), drive the half-bridge driver (2) of fluorescent tube (1), and be arranged on capacitor C 1 and inductance L 1 between fluorescent tube (1) and the half-bridge driver (2), be connected fluorescent tube (1) E end and the F capacitor C 2 between holding; It is characterized in that also comprising:

One lamp longevity sampler (3), this lamp longevity sampler (3) is connected with fluorescent tube (1), is used to detect the pipe pressure of fluorescent tube (1);

One electron rectifier control integrated circuit (4), the voltage at fluorescent tube (1) two ends that this electron rectifier control integrated circuit (4) receiving light longevity sampler (3) is sent here, after relatively, send a control signal, with the work of control half-bridge driver (2) to half-bridge driver (2).

2. the detection in lamp longevity as claimed in claim 1 and protective device is characterized in that: described lamp longevity sampler (3) comprises bleeder circuit and coupling circuit; Bleeder circuit is formed by being arranged on the resistance R el1 and the Rel2 of fluorescent tube (1) E end with the F end; Coupling circuit is made up of capacitor C el1, and the end of capacitor C el1 is connected between divider resistance Rel1 and the Rel2, and the other end is delivered to the C point of electron rectifier control integrated circuit (4).

3. the detection in lamp longevity as claimed in claim 1 and protective device is characterized in that: described lamp longevity sampler (3) comprises bleeder circuit and filter circuit; Bleeder circuit is made up of the resistance R el1 and the Rel2 that are arranged between fluorescent tube (1) F end and the ground connection; Filter circuit is made up of capacitor C el1, and this filter capacitor Cel1 and divider resistance Rel2 are connected in parallel.

4. the detection in lamp longevity as claimed in claim 1 and protective device is characterized in that: described lamp longevity sampler (3) comprises bleeder circuit, filter circuit and biasing circuit; Bleeder circuit is formed by being arranged on the resistance R el1 and the Rel2 of fluorescent tube (1) E end with the F end; Filter circuit is made up of capacitor C el1, and this filter capacitor Cel1 and divider resistance Rel2 are connected in parallel; Biasing circuit is made of biasing resistor Rel3, and the end of this biasing resistor Rel3 is connected with power supply, and the other end is connected with filter capacitor Cel1.

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