JPH08213178A - Lighting circuit device of low-pressure discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting circuit device of a low pressure discharge lamp which does not start when there is a defect in lamp electrodes. SOLUTION: A circuit device contains inverters T10 and T11 and a driving device ST1 of these inverters. This circuit device has at least a single high impedance DC circuit to connect a power source to the driving device ST1 of the inverters T10 and T11, and lamp electrodes E10 and E11 are incorporated into this high impedance DC circuit. Therefore, when the lamp electrodes E10 and E1 are damaged, since the high impedance DC circuit is cut off, when supply voltage is newly imparted, an oscillation rising of the inverters T10 and T11 is checked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting circuit device for one or a plurality of low-pressure discharge lamps including an inverter and a driving device for the inverter.

This circuit arrangement is particularly suitable for illuminating compact fluorescent lamps whose ignition voltage exceeds the AC voltage generated by the inverter and for illuminating small fluorescent lamps. In this circuit arrangement, the principle of increased resonance is used not only for generating the ignition voltage required for the low-pressure discharge lamp, but also for supplying the lamp operating voltage.

[0003]

2. Description of the Prior Art A circuit arrangement of this kind is described, for example, in DE-A-4303595. This circuit arrangement has an inverter with a LC output circuit or a resonant circuit after which a compact fluorescent lamp is incorporated. In parallel with the electrode filament of the fluorescent lamp, there is a reactance that prevents an increase in the current through the electrode filament and thus excessive heating of the lamp electrode during the electrode preheating phase and excessive damping of the resonant circuit during the ignition and ignition phases. It is connected. The circuit arrangement described in the above publications works even if the lamp electrode is defective, for example even if the electrode filament is broken. This is because the resonant circuit is not broken due to a defect in the lamp electrode.
However, such a lighting state is not desirable for safety reasons. This is because this may cause the lamp member to overheat and damage the lighting device.

[0004]

SUMMARY OF THE INVENTION It is an object of the invention to provide a lighting circuit arrangement for one or more low-pressure discharge lamps which does not start if the lamp electrodes are defective.

[0005]

According to the invention, the circuit arrangement according to the invention comprises at least one high-impedance direct current in which the circuit arrangement incorporates the electrodes of a low-pressure discharge lamp which connects the drive of the inverter to a voltage source. This high-impedance direct current path has a path and is broken if the lamp electrode is defective, so that it is solved by removing the control signal when the supply voltage is reapplied from the inverter.

Particularly advantageous embodiments of the invention are described in the subclaims.

A circuit device according to the present invention comprises an inverter,
It includes a drive for this inverter and at least one high-impedance direct current path incorporating the electrodes of the low-pressure discharge lamp to be ignited, which connects the drive for the inverter to a voltage source. As soon as the supply voltage is applied,
This high impedance DC current path ensures that the drive of the inverter starts first. The lamp electrode, which is usually formed as a filament, is incorporated in this high-impedance direct current path so that the high-impedance direct current path is broken if the lamp electrode is defective. By such measures, one of the lamp electrodes
If one of them is defective, the inverter is prevented from rising when the supply voltage is newly supplied. This high-impedance direct current path requires only a few auxiliary components, so that the entire circuit arrangement can be accommodated in the base of a compact fluorescent lamp.

In order to light the low-pressure discharge lamp with the power supply voltage, a low-pressure discharge lamp is incorporated as an inverter.
A conventional inverter, in particular a half-bridge inverter, in which one or more LC output circuits are connected in parallel is used.
If the inverter has only one LC output circuit incorporating one or more series-connected low-pressure discharge lamps, the circuit arrangement connects the positive pole of the DC voltage source to the drive of the inverter and further all low-voltage It is advantageous to have only one high-impedance direct current path, which comprises the electrode filaments of the discharge lamp connected in series. If a filament breaks in one of the lamp electrodes, this high-impedance direct current path is cut off and the start-up of the inverter oscillation is blocked when a new supply voltage is applied to the circuit arrangement.

When the inverter is connected to a plurality of LC output circuits connected in parallel each having only one low-pressure discharge lamp or a plurality of low-pressure discharge lamps connected in series, the circuit device has the same number of DC output circuits as the DC output circuits. It is advantageous to have a current path. In that case, each high impedance direct current path comprises a series connection of the lamp electrodes of one or more low pressure discharge lamps incorporated into the LC output circuit.
The high-impedance DC current path then starts from the positive pole of the DC voltage source and is led to the input of an AND gate whose output is connected to the drive of the inverter. In this way it is ensured that the inverter does not rise in oscillation when a new supply voltage is applied to the circuit arrangement, for example if one of the direct current paths is broken, for example caused by a defect in one lamp electrode. .

[0010]

The present invention will now be described in detail based on a plurality of embodiments.

FIG. 1 shows a first embodiment based on the principle of the circuit device according to the present invention. The circuit shown in FIG. 1 has a half-bridge inverter which is composed of two transistors T10 and T11 and which is supplied from a DC voltage source and which includes a drive device ST1. An LC output circuit formed as a resonance circuit is connected to the intermediate tap M1 of the half bridge inverters T10 and T11. The resonance circuit includes a resonance inductance L1 connected to the center tap M1 and a resonance capacitor C11 connected to the resonance inductance LI and the positive pole of the DC voltage source. Furthermore, the circuit arrangement shown in FIG. 1 has a coupling capacitor C10, which is a coupling capacitor C1.
On the one hand, 0 is connected to the negative pole of the DC voltage source and on the other hand to the positive pole of the DC voltage source via tap A1 and resistor R10. The low-pressure discharge lamp LP1 to be lit is built into the circuit between the tap A1 and the tap A2 located between the resonant inductance L1 and the resonant capacitor C11. The electrodes E10, E11 of the low-pressure discharge lamp LP1 are each formed as a filament with two electrical terminals. Electrodes E10, E11
Each of the first terminals of is connected to tap A1 or tap A2, while the second terminals of both electrodes E10, E11 are respectively led to one terminal of ignition capacitor C12 and one terminal of resistor R11, whereby ignition capacitor C12 The resistor R11 is connected in parallel to the discharge section of the low-pressure discharge lamp LP1. Furthermore, this circuit arrangement has a resistor R12 connected to the drive ST1 and via the tap A3 to the resonant inductance L1 and the intermediate tap M1.

Half bridge inverters T10 and T11
Immediately after the start of the oscillation, the ignition capacitor C12 supplies the ignition voltage necessary for ignition of the low-pressure discharge lamp LP1 due to the increased resonance, and the lamp is ignited without preheating the lamp electrode. During the lighting period, between the taps M1 and A1 is a high frequency alternating current, that is, about 20 KH through the discharge section of the lamp.
An alternating current with a frequency in the range z to about 200 KHz flows. As shown in FIG. 1, the resonance circuits L1 and C1
1 forms a closed current circuit even if the lamp LP1 is defective, and in particular the lamp electrode is not incorporated in the resonant circuit. Half bridge inverter is lamp L
It will be driven even if P1 is defective or defective. In order to prevent such a driving state, the circuit device is provided with a resistor R1 connected in series in direct current.
0, electrode filament E11, resistance R11, electrode filament E10, resonance inductance L1, and resistance R1
The direct current path formed by 2 is provided. This direct current path forms a direct current connection between the positive pole of the direct voltage source and the input of the drive ST1. When a supply voltage is applied to the circuit device, the drive device ST1 is supplied with a voltage via this direct current path, and the half bridge inverter T1 is supplied.
0, T11 causes oscillation rise. If the electrode filament E10 or E11 is broken, the direct current path is cut off and therefore the drive device is not supplied with voltage when the circuit device is newly activated, and therefore the inverters T10, T11 start up oscillating. Can't do.

FIG. 2 shows a second embodiment of the invention with two low pressure discharge lamps LP20, LP21 connected in series. The circuit arrangement shown in FIG. 2 has a half-bridge inverter which is composed of two field effect transistors T20 and T21 and which is fed from a DC voltage source and is excited by a drive unit ST2. This inverter T2
The coupling capacitor C2 is connected to the intermediate tap M2 of 0 and T21.
0, resonance inductance L20, low-pressure discharge lamp LP2
1, the electrode filament E23, the resonance capacitor C21,
And electrode filament E20 of the low-pressure discharge lamp LP20
L led to the positive pole of the DC voltage source via
The C output circuit is connected. Furthermore, this circuit device
The positive pole of the DC voltage source is connected to the electrode filament E20 of the low-pressure discharge lamp LP20, the resistors R21 and R22, the electrode filament E21 of the low-pressure discharge lamp LP20, the secondary winding L21 inductively coupled to the resonance inductance L20, and the low-voltage discharge lamp LP21. Electrode filament E22, resistance R
23, R24, the electrode filament E23 of the low-pressure discharge lamp LP21, the resonance inductance L20, and the resistor R2.
It has a direct current path according to the invention which is connected via 0 to the input of drive ST2. Furthermore, this circuit device
A capacitor C23 connected to the negative pole of the DC voltage source on the one hand and to the resonance inductance and the terminal of the electrode filament E23 on the other hand, together with the electrode filaments E21, E22 and the secondary winding L21, forms a closed current circuit. It has a heating capacitor C22 which enables preheating of the lamp electrodes E21, E22 by means of a high-frequency alternating current induced in the secondary winding L21. Lamp electrodes E20, E21, E2 incorporated in series in the direct current path
When a filament breakage occurs in one of E2 and E23, the direct current connection between the drive device ST2 and the positive pole of the direct current voltage source is disconnected, which causes oscillation of the inverters T20 and T21 when a new supply voltage is applied. Rise is blocked.

FIG. 3 shows the principle of a third embodiment of the invention with two low pressure discharge lamps LP30, LP31 connected in parallel. The circuit arrangement shown in FIG. 3 has a half-bridge inverter composed of two field-effect transistors T30 and T31, fed from a DC voltage source and controlled by a drive unit ST3. This inverter T
Two parallel-connected LC output circuits provided for one low-pressure discharge lamp LP30, LP31 are connected to the middle tap M3 of 30, T31, respectively. First
The LC output circuit includes a coupling capacitor C30, a resonance inductance L30, and a resonance capacitor C3 acting in parallel.
2 and C33 are included. The low-pressure discharge lamp LP30 is arranged in parallel with the resonance capacitors C32 and C33.
The second LC output circuit includes a coupling capacitor C31, a resonant inductance L31, and resonant capacitors C34 and C35 acting in parallel. Second low-pressure discharge lamp L
P31 is arranged in parallel with the resonance capacitors C34 and C35. Further, the circuit device shown in FIG. 3 has an AND gate U whose output end is connected to the input end of the driving device ST3,
It also has two high-impedance DC current paths, which are led from the positive pole of the DC voltage source to the respective inputs of the AND gate U. In the first high-impedance DC current path, the electrode filament E30 and the resistors R34 and R3 connected in parallel to the discharge section of the low-pressure discharge lamp LP30.
4, electrode filament E31, resonance inductance L3
0 and a resistor R30 connected to the tap A4 between the resonance inductance L30 and the coupling capacitor C30 are incorporated in series. An electrode filament E32 and a low-pressure discharge lamp L are provided in the second high-impedance DC current path.
Resistors R36 and R3 arranged in parallel in the discharge section of P31
7, electrode filament E33, resonance inductance L3
1 and a resistor R32 connected to the tap A5 between the resonance inductance L31 and the coupling capacitor C31 are incorporated in series. In addition, this circuit device includes two separate taps, which connect the tap A6 located between the resistor R30 and the AND gate U or the tap A7 located between the resistor R32 and the AND gate U to the negative pole of the DC voltage source. It has resistors R31 and R33.

Immediately after applying the supply voltage to the circuit arrangement shown in FIG. 3, the two DC current paths connected in parallel are connected via the AND gate to the positive pole of the DC voltage source and the inverter T30.
A direct current connection is formed between T31 and the drive ST3, which makes it possible to start the inverters T30, T31 and subsequently the lamp. However, one of the two direct current paths is cut and caused by the occurrence of a filament breakage, for example, at one of the lamp electrodes E30, E31 or E32, E33 which is incorporated in series in this direct current path. Then, the rising of the oscillation of the inverters T30 and T31 is prevented when a new supply voltage is applied. This is because the direct current connection between the positive pole of the direct voltage source and the drive ST3 is then broken as well.

The fourth embodiment of the present invention shown in FIG.
Preheated lamp electrode E formed as a filament
40 shows the application of the present invention to a free oscillation type current feedback inverter for lighting a low pressure discharge lamp LP4 equipped with 40 and E41. This circuit arrangement has two bipolar transistors Q40, Q41 connected as a half-bridge inverter and fed by a DC voltage source. The intermediate tap M4 of the half-bridge inverters Q40 and Q41 has an LC output circuit including a primary winding RK4a of the annular core transformer, a resonant inductance L4, and a resonant capacitor C42 having one terminal connected to the positive pole of the DC voltage source. Are connected. The circuit arrangement shown in FIG. 4 further comprises two coupling capacitors C4 connected in series with an intermediate tap A8.
It has 0 and C41. The coupling capacitor C40 is connected via the collector of the bipolar transistor Q40 to the positive pole of the DC voltage source, while the coupling capacitor C41 is connected via the emitter of the bipolar transistor Q41 to the negative pole of the DC voltage source. The low-pressure discharge lamp LP4 is incorporated into the circuit arrangement between the intermediate tap A8 and the tap A9 located in the LC circuit between the resonant inductance L4 and the resonant capacitor C42. A heating or ignition capacitor C44, C45 is arranged in the first parallel circuit of the discharge section of the low-pressure discharge lamp LP4, and a series connection consisting of a resistor R43 and a positive temperature coefficient thermistor KL4 is arranged in the second parallel circuit. ing. Both firing capacitors C44, C45 and resistance elements R43, KL4
Have intermediate taps V1, V2 interconnected.

The drive device for the half-bridge inverter is
Primarily, a primary winding RK4a is arranged in the LC output circuit, while each secondary winding RK4b or RK4c is connected in the base circuit of a bipolar transistor Q40 or Q41 together with a respective base pre-resistor R40 or R41. It is composed of vessels. Moreover, this driving device is mainly composed of a diac DC4 and a capacitor C4.
3 and a starting device composed of a diode D4. Further, the circuit device of the fourth embodiment has a high-impedance DC current path that prevents the half bridge inverters Q40 and Q41 from rising when the lamp electrodes E40 and E41 are damaged. This DC current path starts from the positive pole of the DC voltage source
4, capacitor C43, intermediate tap M4, primary winding RK
4a, resonance inductance L4, electrode filament E4
0, resistor R43, positive temperature coefficient thermistor KL4, electrode filament E41, intermediate tap A8, and coupling capacitor C
It includes a resistor R42 arranged in parallel with 41 and connected to the negative pole of the DC voltage source. All the above-mentioned components of the high-impedance direct current path are galvanically connected in series.

After starting the circuit arrangement, the capacitor C43 is charged via the direct current path, so that the diac DC
4 provides a trigger pulse to the base of the bipolar transistor Q40, which causes the half-bridge inverter Q40 to
40 and Q41 start oscillating. After the oscillation of the half-bridge inverters Q40 and Q41 rises, the capacitor C43 is discharged through the diode D4, so that the DIAC DC4 does not generate a trigger pulse for the base of the transistor Q40. The half-bridge inverters Q40 and Q41 are high-frequency alternating currents (that is, between the intermediate taps M4 and A8) flowing through the electrode filaments E40 and E41 and the heating capacitor C44 and the positive temperature coefficient thermistor KL4 as a heating current first (that is, between the intermediate taps M4 and A8). AC current having a frequency of about 20 KHz to 200 KHz is generated. At the end of the electrode preheating period, the positive temperature coefficient thermistor KL4 has a high resistance, and therefore the necessary point for the low-pressure discharge lamp LP4 due to the resonance increase by the activated ignition capacitor C45 and the LC output circuit formed as a resonance circuit. An arc voltage can be generated. Even if the lamp LP4 fails, the components RK4a, L4, C42 and the transistor Q40 start from the intermediate tap M4.
There is still a closed loop LC output circuit through the collector of the inverter Q40, Q41
As such it will still work in this case. In any case, the high impedance DC current path according to the invention is a lamp L
If P4 is broken, it will be disconnected. As a result, the capacitor C43 is not charged during a new start-up of the circuit arrangement, and therefore the diac DC4 cannot generate a trigger pulse to the transistor Q40, so that the oscillation rise of the half-bridge inverters Q40, Q41 is caused by the ramp LP4. If is broken, it is blocked.

FIG. 5 shows a fifth embodiment of the circuit device according to the invention. This circuit comprises a free-oscillating, current-feedback half-bridge inverter fed by direct current to light a low-pressure discharge lamp LP5 which is ignited without cold start or preheating of the lamp electrodes E50, E51. The intermediate tap M5 of the half-bridge inverter formed by the bipolar transistors Q50 and Q51 is
An LC output circuit starting from the intermediate tap M5 and led to the collector of the transistor Q50 or the positive pole of the DC voltage source via the primary winding RK5a of the annular core transformer, the coupling capacitor C50, the resonance inductance L5, and the resonance capacitor C51. Are connected. The low-pressure discharge lamp LP5, the resonance capacitor C52, and the resistor R5 are arranged in parallel with the resonance capacitor C51 and in their own parallel circuits.
0 is connected. Half bridge inverter Q5
The drive devices for 0 and Q51 are mainly composed of the primary winding RK5a.
Is connected in the LC output circuit and the secondary winding RK5b or RK5c is a switching transistor Q50 or Q50.
51, an annular core transformer and a capacitor C53 and C54, respectively, which are respectively incorporated in the base circuit of 51.
And one diode D5, which is likewise incorporated into the base circuit of each of the transistors Q50 and Q51 and arranged in parallel with its respective capacitor.
0 and D51. Furthermore, this circuit arrangement has a high-impedance direct current path which connects the base of the bipolar transistor Q51 to the positive pole of the direct voltage source in a direct current manner. This high-impedance direct current path starts from the positive pole of the direct-current voltage source and has a first lamp electrode E50 formed as a filament and a resistor R.
50, a second lamp electrode E51 formed as a filament, a resonance inductance L5, and a resistor R51 connected to a branch point located between the coupling capacitor C50 and the resonance inductance L5 in the LC circuit and the base of the transistor Q51. Is included. The base of the first transistor Q50 is likewise galvanically connected to the positive pole of the DC voltage source via a resistor R52.

When a supply voltage is applied to the circuit arrangement shown in FIG. 5, the half-bridge inverter Q5 is connected via the resistor R52 and the high-impedance DC current path according to the invention.
A so-called noise start of 0 and Q51 occurs. That is, the oscillation of the inverters Q50 and Q51 rises through the secondary windings RK5b and RK5c when positive feedback is performed so that one of the bipolar transistors first becomes conductive and the oscillation of the inverters Q50 and Q51 starts. It is caused by the always-present noise voltage being amplified. If the high-impedance direct current path is broken, for example due to a break in the electrode filament E50 or E51, the base electrode of the transistor Q51 will not obtain a control signal when a new voltage supply is applied, which results in an inverter Q.
Oscillation rise of 50 and Q51 is prevented.

The design values of the electronic components used in the embodiments described above depend on the input power of the low-pressure discharge lamp to be lit as well as the freely available voltage source.

FIG. 6 shows a sixth embodiment of the circuit arrangement according to the invention for operating a compact fluorescent lamp having an input power of about 23 W with an AC power supply voltage of 120 V and 60 Hz. The design values of the components used here are shown in Table 1. This circuit device is a free oscillation type current feedback type half bridge inverter T60, T6 fed from a DC voltage source.
One. Electrolytic capacitor C6 as DC voltage source
0 is used, and this electrolytic capacitor is connected to an AC voltage source via a rectifier GL connected in series, a noise prevention filter F, and a fuse SI. The intermediate tap M6 of the half-bridge inverter formed by the MOSFET transistors T60 and T61 is the intermediate tap M6.
The LC output circuit is connected to the drain terminal of the MOSFET transistor T60 via the resonance inductance L6a and the resonance capacitor C61. A coupling capacitor C64 and a fluorescent lamp LP6 are arranged in a parallel circuit of the resonance capacitor C61.
A resistor R61 is connected in parallel with the coupling capacitor C64. A heating or ignition capacitor C62 or C63 is arranged in the first parallel circuit for the fluorescent lamp LP6. The second parallel circuit for the fluorescent lamp LP6 includes a high resistance R60 and a positive temperature coefficient thermistor KL6. The intermediate tap V3 between the capacitors C62 and C63 and the intermediate tap V4 between the resistance elements R60 and KL6 are connected to each other.

The drive device for the inverters T60 and T61 is
Mainly, two secondary windings L6b and L6c which are inductively coupled to the resonance inductance L6a and connected to the gate electrodes of the transistors T60 and T61, respectively, and one low-pass filter R63 and C65 which are respectively pre-connected to the gate electrodes thereof, It is composed of R64 and C66. In addition, this drive is a Diac DC
6, a starting device including a capacitor C67 and a diode D6. This starting device has the same structure and function as the starting device of the fourth embodiment. Furthermore, the circuit device according to the sixth embodiment includes an electrolytic capacitor C.
Starting from the positive pole of 60, a first lamp electrode E60 of a compact fluorescent lamp LP6 formed as a filament, a resistor R60, a positive temperature coefficient thermistor KL6, a second lamp electrode E61 formed as a filament, a resistor R61, Resonance inductance L6a and resistance R62
Has a high impedance DC current path including a resistor R62 connected to the first terminal of a capacitor C67,
On the other hand, the second terminal of the capacitor C67 is the electrolytic capacitor C6.
It is led to the negative pole of 0.

Given the supply voltage, the inverter T60,
T61 is supplied with the rectified power supply voltage from the electrolytic capacitor C60. The start capacitor C67 is charged via the high-impedance DC current path described above, whereby the DIAC DC6 sends a trigger pulse to the transistor T61.
, And the half bridge inverters T60 and T61 start oscillation. After the oscillation of the inverter rises, the start capacitor C67 is discharged through the diode D6, so that the trigger pulse is not generated from the DIAC DC6. Inverter T60,
T61 applies a high frequency alternating current (about 20 KHz to 200 KHz) to the LC output circuit, the fluorescent lamp LP6 and a parallel circuit for the fluorescent lamp LP6. At that time, first, a high frequency heating current flows through the electrode filaments E60 and E61, the heating capacitor C62 and the positive temperature coefficient thermistor KL6. When the electrode preheating period ends, the positive temperature coefficient thermistor KL6 becomes high in resistance, and as a result, the ignition capacitor C63 and the L formed as a resonance circuit become effective.
Due to the increased resonance with the C output circuit, the ignition voltage required for the low-pressure discharge lamp can be generated. After ignition of the lamp LP6, the high-frequency alternating current and the direct current carried by the direct current path flow through the discharge section of the fluorescent lamp LP6.
In any case, the amplitude of this direct current is about 100 times smaller than the amplitude of the alternating current generated by the inverter, so that the disturbance of the lamp lighting by this direct current does not appear.
If the lamp electrode E60 or E61 is damaged,
The high impedance DC current path described above is disconnected. This is because the electrode filaments E60, E61 are incorporated in series in this DC current path, so that the start capacitor C67 is not charged when the voltage supply is newly started, and thus the diac to the gate of the transistor T61. This is because the trigger pulse is not generated from DC6. As a result, when the lamp electrodes E60 and E61 are damaged, the half bridge impedance T60,
The rising of the oscillation of T61 is prevented.

The invention is not limited to the embodiments described in detail above. The direct current path according to the invention can likewise be integrated in a circuit arrangement with another inverter, for example a full bridge inverter. Furthermore, it is also possible, for example, to use the direct current path according to the invention in a single-ended flyback converter which is advantageously used for lighting a low-pressure discharge lamp with a low-voltage source.

[0026]

Table 1 Design values of electronic components used in the sixth example R60, R61 100KΩ R62 220KΩ R63, R64 680Ω C60 47μF C61, C62 10nF C63 4.7nF C64 47nF C65, C66 6.8nF C67 100nF T60, T61 MOSFET: IRFU224 L6a 1.2mH

[Brief description of drawings]

1 is a schematic diagram showing a first embodiment of a circuit arrangement according to the invention for operating a low-pressure discharge lamp.

2 is a schematic diagram showing a second embodiment of the circuit arrangement according to the invention for operating two low pressure discharge lamps connected in series. FIG.

FIG. 3 is a schematic diagram of a third embodiment of the circuit arrangement according to the invention for lighting two parallel-connected low-pressure discharge lamps.

FIG. 4 is a schematic diagram showing a fourth embodiment of the circuit arrangement according to the invention for igniting a low-pressure discharge lamp with lamp electrodes preheated in a diac-triggered free-oscillating current-feedback inverter.

FIG. 5 is a schematic view showing a fifth embodiment of the circuit device according to the present invention for lighting a low-pressure discharge lamp that does not preheat the lamp electrode in a free-vibration current feedback inverter that is not equipped with a diac start device.

FIG. 6 Approximately 23 for lighting at a power supply voltage of approximately 120V
FIG. 6 is a schematic diagram showing a sixth embodiment of the circuit arrangement according to the invention for a compact fluorescent lamp with an input power of W.

[Explanation of Codes] T10, T11 Inverter (transistor) T20, T21 Inverter (field effect transistor) T30, T31 Inverter (field effect transistor) Q40, Q41 Inverter (bipolar transistor) Q50, Q51 Inverter (bipolar transistor) T60, T61 Inverter (MOSFET transistor) ST1, ST2, ST3 Drive device RK4, RK5 Ring iron core transformer L6 Resonance inductance LP1, LP4, LP5, LP6 Low pressure discharge lamp LP20, LP21, LP30, LP31 Low pressure discharge lamp E10, E11, E20, E21, E22 , E23 electrode E30, E31, E32, E33, E40, E41 electrode E50, E51, E60, E61 electrode U AND gate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ulrich Hilor, Federal Republic of Germany 86165 Augsburg Schütstein Metzschut Neutraße 4a (72) Inventor Ludwitzhi Raiser, Federal Republic of Germany 86368 Gersthofen Brahms Scheutraße 31

Claims (5)

[Claims] 1. An inverter (T10, T11; T20,
T21; T30, T31; Q40, Q41; Q50, Q
51; T60, T61) and this inverter (T10,
T11; T20, T21; T30, T31; Q40, Q
41; Q50, Q51; T60, T61) driving device (ST1; ST2; ST3; RK4; RK5; L6) and one or more low-pressure discharge lamp lighting circuit devices, the circuit device comprising: T10, T1
1; T20, T21; T30, T31; Q40, Q4
1; Q50, Q51; T60, T61) drive device (S
T1; ST2; ST3; RK4; RK5; L6) is connected to a voltage source and a low pressure discharge lamp (LP1; LP
4; LP5; LP6; LP20, LP21; LP30,
LP31) electrodes (E10, E11; E20, E21,
E22, E23; E30, E31, E32, E33; E
40, E41; E50, E51; E60, E61) are incorporated into the lamp electrode (E10, E11; E20, E21, E22, E2).
3; E30, E31, E32, E33; E40, E4
1; E50, E51; E60, E61) is broken if there is a defect, so that the inverter (T10, T1)
1; T20, T21; T30, T31; Q40, Q4
1; Q50, Q51; T60, T61), a control signal is removed when a supply voltage is newly applied, a lighting circuit device for a low-pressure discharge lamp. 2. Inverters (T10, T11; T20,
T21; T30, T31; Q40, Q41; Q50, Q
51; T60, T61) low pressure discharge lamp (LP1; L
P4; LP5; LP6; LP20, LP21; LP3
0, LP31) incorporated into at least one LC
Output circuit is connected, low pressure discharge lamp (LP1; LP
4; LP5; LP6; LP20, LP21; LP30,
LP31) electrodes (E10, E11; E20, E21,
E22, E23; E30, E31, E32, E33; E
40, E41; E50, E51; E60, E61) are formed as filaments, and this electrode filament (E
10, E11; E20, E21; E22, E23; E3
0, E31, E32, E33; E40, E41; E5
0, E51; E60, E61) are serially incorporated into a high impedance DC current path, which is connected to the inverter (T10, T11; T20, T2).
1; T30, T31; Q40, Q41; Q50, Q5
1; T60, T61) drive device (ST1; ST2; S
Circuit arrangement according to claim 1, characterized in that T3; RK4; RK5; L6) is connected to a voltage source. 3. The inverter (T20, T21) comprises at least two series connected low pressure discharge lamps (LP20, T20).
LP21) has an LC output circuit, and the electrode filaments (E20, E21, E22, E23) of the low pressure discharge lamps (LP20, LP21) connected in series are incorporated in series in the high impedance DC current path, and this high impedance Circuit arrangement according to claim 1 or 2, characterized in that the direct current path connects the drive (ST2) of the inverter (T20, T21) to a voltage source. 4. A plurality of LC output circuits connected in parallel are connected to the inverter (T30, T31), and each LC output circuit has at least one low-pressure discharge lamp (LP30, L30).
P31), for each LC output circuit, belonging to the corresponding LC output circuit low pressure discharge lamp (LP30, LP3
1) Electrode filament (E30, E31, E32, E
33) is provided in series with a high impedance direct current path, the high impedance direct current path being
Connected to the input terminal of the ND gate (U) and the voltage source, AN
The output terminal of the D gate (U) is an inverter (T30, T3).
3. The circuit device according to claim 1 or 2, which is connected to the driving device (ST3) of 1). 5. An inverter (T10, T11; T20,
T21; T30, T31; Q40, Q41; Q50, Q
51; T60, T61) is a half-bridge inverter.