RU7270U1 - LIGHTING DEVICE - Google Patents

Description

LIGHTING DEVICE

The invention relates to the field of electrical engineering and is able to find use in the creation of duct-controlled devices (PRA) of gas-discharge lamps.

A device is known described in the application of Germany N 3142613. 1981, N 05 V 41/24, consisting of a half-bridge transistor inverter, the input of which is connected to the terminals for connecting a DC voltage source, and the first output terminal is connected to a series-connected ballast inductor and the first electrode of the first the cathode of the discharge lamp, the second output of the transistor inverter is connected to the first electrode of the second cathode of the lamp. Parallel to the first electrodes of the first i: second cathodes of the lamp, a parallel oscillatory circuit is connected, consisting of a parallel connected capacitor and a first inductance. The primary winding of the feedback transformer is included in the capacitor circuit and the sensitivity, the first terminals of the secondary windings of which are connected to the gates of the inverter transistors, and the second to the sources. To the second electrodes of the first and second cathodes of the lamp, a circuit consisting of a bimetallic starter and a second inductance connected in series is connected.

The disadvantage of this device is the lack of reliability due to the presence of a bimetallic starter, which is characterized by low reliability.

A device is known for stabilizing the discharge of a fluorescent lamp with resonant ignition (USSR author's certificate m 1403393, Н05 В, 1986), according to modernity it will be able to MPK Н05 Е

venous signs adopted for the prototype and the current transistor inverter, inductor and condenser of the resonant circuit, parallel to the capacitor of which the leads are connected to connect the fluorescent lamp. The input of the transistor inverter is connected to the terminals for connection to a constant current source, and the output is connected to a droplet and a resonant circuit capacitor; the input terminals of the time relay are connected to the terminals for connection to the current source, and the output terminals are connected to an additional capacitor, which is connected in series with the resonant loop throttle.

The disadvantage of this device is its lack of reliability, because with an increase in the supply voltage, the lamp may light up without heating the electrodes, and in the case of a decrease in the supply voltage, the voltage at the resonance circuit condense may not reach the ignition voltage of the Dasho lamp when the time relay is activated. The reliability of the device is also greatly affected by the spread in the parameters of the elements of the transistor inverter and the lamp, the circuit requires additional adjustment.

in the inventive lighting device, which sells a fluorescent lamp, a transistor inverter, the first output of which is connected to a series-connected inductor, a first filament lamp electrode, a censor and a second filament electrode of the lamp, the second output ROVSD is connected to a free terminal of the second filament lamp electrode, the transistor inverter is connected to the power supply source through the voltage boosting unit introduced into the device allows to increase

The claimed invention is not known from the prior art, therefore, it is new.

Comparison of the claimed invention with other technical solutions did not allow us to identify solutions having features that match the distinctive features of the claimed invention, which allows us to conclude that the invention meets the condition of an assessment level.

Figure 1 presents a block diagram of a lighting device.

Figure 2 presents the block diagram of the voltage boost f.

On Fig.3 shows a graph of the voltage at vhsv transistor inverter from time to time, where

UAV is the voltage at points a, at the input of the transistor of the inverter,

Uzaz is the voltage at points a, at the input of the transistor inverter at which the lamp ignites, Uzap is the voltage at points a, at the input of the transistor inverter, at which the transistor inverter starts to work. tnp is the time during which the lamp electrodes warm up.

The device contains a fluorescent lamp 1. a transistor inverter 2, the first output terminal of which is connected to the choke 3 connected in series, the first incandescent electric lamp 1, the capacitor 4 and the second incandescent electric lamp 1, and the second output terminal of the transistor inverter 2 is connected to the free output of the second poppy electrode lamp: voltage boosting unit 5, the input of which is connected to the terminals for connecting a DC source and off PEYAZLN EX house of a transistor inverter 2.

The voltage raising block 5 contains a series-connected resistor 6 and a transistor, the zitter-base junction of which is connected by an additional capacitor 8.

Waterworks works as follows.

At the initial time, when a constant voltage voltage 5 ohm is applied to the input of the ohm block 5, a smooth increase in voltage occurs at the output of the voltage rise block - at points a, b, as shown in Fig.Z. When in the estruses a, in the input of the transistor inverter 2, a certain voltage (Pzap) is reached. the value of which is less than the lower boundary of the spread of the supply voltage, the transistor inverter 2 starts up. The voltage on the capacitor 4 at the time of starting the inverter 2 is less than the lamp ignition voltage, and the inverter current closes through the electrodes of the lamp 1, warming them up. Parameters of voltage boost unit 5 and inverter 2 start voltage

so that during the voltage rise at points a, in H :: the input of the inverter 2 from the moment of its start to the ignition of lamp 1 (tnp), the electrodes of the lamp are sufficiently warm.

The advantage of this circuit is that the current through the lamp electrodes rises smoothly, preventing premature wear of the electrodes, and the lamp is not ignited coldly. In the case of short-circuit in the transistor inverter, the voltage rise block limits the short-circuit current, thereby protecting the inverter from failure.

 4

Claims (2)

1. A lighting device comprising a fluorescent lamp, a transistor inverter, the first output terminal of which is connected to a series-connected inductor, a first glow lamp electrode, a capacitor and a second glow lamp electrode, and a second output terminal is connected to a free terminal of a second glow lamp electrode, characterized in that a voltage boosting unit is introduced into it, the input of which is connected to the terminals for connecting a DC source, and the output is connected to the input of the transistor inverter. 2. The device according to claim 1, characterized in that the voltage raising unit comprises a resistor and a transistor connected in series, the emitter-base transition of which is shunted by an additional capacitor.