SU1534764A1 - Lighting device - Google Patents

Abstract

The invention relates to electrical engineering and can be used in lighting installations for controlling the luminous flux of fluorescent lamps. The aim of the invention is to reduce power consumption and simplify the design. The device does not need to synchronize the ignition pulses with the moment of opening the key, since ionizing impulses are generated automatically when the key goes into the open state. The amplitude of the ignition pulses changes, and the larger the key opening angle, the larger the amplitude of the ionizing pulse. 1 il.

Description

The invention relates to electrical engineering and can be used in lighting installations for controlling the luminous flux of fluorescent lamps.

The aim of the invention is to reduce power consumption and simplify the design.

The drawing shows a diagram of a device for adjusting the luminous flux of fluorescent lamps.

The device contains an AC controlled switch 1, the first output of which is connected to output 2 for connecting the supply mains, and the second with the first output of the circuit from the series-connected storage capacitor 3 and the primary winding of the pulse transformer 4 and the first terminals of the ballast chokes 5 according to the number of fluorescent lamps 6, the second terminals of the ballast chokes 5 are connected to the first electrodes of the corresponding fluorescent lamps 6, the second electrodes of which are connected to the output 7 for connecting the supply network and the first The output of the secondary winding of the pulse transformer 4, the second output of which is connected to the first electrodes of the respective lamps 6 through the separating capacitors 8, the free output of a circuit from the series-connected storage capacitor 3 and the primary winding of the switching transformer 4 whose control input is connected to the output

Home source 9 control signals.

Fluorescent lamps 6 with incandescent electrodes, which are connected to the secondary windings of the incandescent transformers 10 by the number of lamps 6, can be used in the device, and the primary windings of the transformers 10 are connected to the output of the control unit 11 of the incandescent lamp.

The device works as follows.

The source of control pulses 9 generates pulses from which the depth of control of the luminous flux of fluorescent lamps 6 depends, and the operation of the source of control pulses 9 is performed directly from the AC mains. Suppose that at some time Vo at the output 2 of the mains supply a positive half-wave voltage appears, the AC key 1 is closed, the storage capacitor 3 starts to charge along the circuit: pin 2, the primary winding of the pulse transformer 4, ballast connections ш 5, luminescent lamp 6, the bus supply voltage bus 7, When the accumulator capacitor 3 is harvested, a positive potential arises at its output connected to the primary winding of the pulse transformer 4, and a negative potential at the second output is open and key 1, the storage capacitor 3 is discharged to the primary winding of the pulse transformer 4. On the secondary winding of the pulse transformer 4, a high voltage pulse is produced, which through the separation capacitors 8 is applied to the electrodes of the fluorescent lamps 6, ensuring their ignition,

In the negative half-period of the mains, similar processes occur.

When the opening angles of the key 1 are greater than 90, the storage capacitor 3 has time to charge to a higher voltage and when it is discharged to the primary winding of the pulse transformer 4 in the secondary winding, a high-voltage pulse of large amplitude appears. At small opening angles of key 1, the storage capacitor 3 is charged to a lower voltage and the pulse amplitude is secondary

0

0

5 g

0

40

45

50

55

At a key opening angle of 1 0 °, the storage capacitor 3

the winding of the pulse transformer 4

less,

equal

does not have time to charge and the formation

the ionizing impulses cease.

The use of the proposed device contributes to the stable ignition of fluorescent lamps even when the voltage at the output of the AC key 1 is of the order of 20-25V, i.e. The device provides stable control of the luminous flux of fluorescent lamps from almost zero to nominal level, while the capacitance of the storage capacitor 3 is chosen so as to ensure that the duty arc current flows through the fluorescent lamps 6 at the moment when the key 1 is in a non-conducting state.

The device does not need to synchronize the ionizing pulses with the moment of opening when the switch 5 is in the open state, which simplifies the design of the device.

Claims (1)

Invention Formula A lighting device containing a controlled AC switch, the first output of which is connected to one of the connections for connecting the supply network, and the second to the first output of the circuit from the series-connected storage capacitor and the primary winding of the pulse transformer and the first terminals of the ballast chokes according to the number of fluorescent lamps , the second terminals of the ballast chokes are connected to the first electrodes of the respective fluorescent lamps, the second electrodes of which are connected to the second output for connecting The power supply network and the first output of the secondary winding of the pulse transformer, the second output of which is connected to the first electrodes of the respective lamps by separating ballast resistance, characterized in that, in order to reduce power consumption and simplify the design, capacitors are used as separation ballasts. the free output of the circuit from the series-connected storage capacitor and the primary winding of the pulse transformer is connected to the first mu conclusion AC key. Compiled by M, Mkhntarov Editor A. Shandor Tehred M. Didyk Proofreader L. Pat ai Order 57 Circulation 656 VNIIPI State Committee for Inventions and Discoveries under the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription