SU1534765A1 - Lighting device - Google Patents

Abstract

The invention relates to electrical engineering and can be used in lighting installations where it is necessary to regulate the luminous flux, as well as smoothly switching on and off the lighting. The aim of the invention is to reduce metal consumption, dimensions and power consumption. By introducing a control unit for the presence of current, a source of constant voltage, a switch, logical gates, and NO-2, and four diodes to each of the fluorescent lamps in the device, it is possible to get rid of the incandescent transformers, to turn on and off the fluorescent lamps, and also turn on the electrode current only at those moments of the supply voltage half-periods when the AC switch is closed, which allows keeping the temperature of the filament electrodes close to constant. 1 il.

Description

The invention relates to electrical engineering and can be used in lighting installations in various sectors of the national economy, where it is necessary to regulate the luminous flux of fluorescent lamps, as well as smoothly switching on and off lighting, for example, in poultry farming to control the level of illumination in the house.

The aim of the invention is to reduce the metal consumption, size and power consumption.

The drawing shows a diagram of the proposed device.

The device contains controlled ACL 1 AC, the first output

which is connected to the output 2 for connecting the supply network, and the second is connected to the first terminals of the ballast chokes 3 by the number of lamps, the second terminals of which are connected to the first terminals of the first initial electrodes of the corresponding fluorescent lamps 4, the first terminals of the second incandescent electrodes of the fluorescent lamps 4 are connected to the output 5 for connecting the power supply voltage of the illumination level sensor 6, the output of which is connected to the input of the first generator 7, the output of the first generator 7 is connected to the input of the second generator 8, the output of which connected to the control input of the AC key 1,

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block 9 for monitoring the presence of current of fluorescent lamps 4, source 10 of a constant filament voltage, switch CJ AND, logical elements NOT 12, 2I-NOT 13 with four diodes 14-17 for each of the fluorescent lamps 4, and the output of block 9 for controlling the presence of current connected to the first input terminal of logic element 2И-НЕ 13, the second input terminal of which is connected via the logic element NO 12 to the output of the first generator 7, and the output of the logic element 2 AND-NOT 13 is connected to the control input of the switch 11, to one of the the conclusions of the source 10 on this voltage la through diodes 14 and 15 connected to the first terminals of the electrodes of fluorescent 4, through which terminals vtoryu d ode 16 and 17 are connected with one of the switch terminals 11, the other terminal of which is connected to the other terminal of source 10 is a DC voltage Nacalai

Fluorescent lamps 4 can be with conductive strip 18 on the cylinder.

The setting unit 6 for the illumination level, for example, contains a switch 19 for the operation mode, the output of which is connected to the input of the integrator 20, the output of the latter through a variable resistor 21 is connected to the input of the adder 22. The variable resistor 21 sets the required level illuminated by the CC.

The first generator 7 contains a computer 23 and a voltage generator 24, synchronized with the supply voltage. The inverting input of the comparator 23 is the input of the first generator 7, and the non-inverting input is connected to the output of the saw-tooth generator 24.

The second generator 8 contains a frequency filling generator 25, the output of which is connected to the second input of element 2 and 26, the output of which is connected to the input of transistor switch 27. The first input of element 2 and 26 is the input of second generator 8 Secondary windings of the pulse transformer 28 are output of the second generator 8

The current presence monitoring unit 9 contains a rectifying bridge 29, a current sensor 30 and a transistor switch 31.

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The filament voltage source 10 comprises a transformer 32 and a rectifying bridge 33.

The switch 11 includes an optotransistor 34, a transistor switch 35 and a power transistor 36.

The device works as follows.

When the light is turned on, the switch 19 of the operating mode of the setting device 6 of the luminance level is set to the On position. At the first moment the voltage at the output of the integrator 20 and the variable resistor 21 of the setting device 6 of the luminance level is zero. At the output of the adder 22 there is a positive voltage close to the supply voltage, which is fed to the inverting input of the comparator 23 of the first generator 7, the non-inverting input of the comparator 23 receives a sawtooth voltage from the output of the sawtooth voltage generator 24, synchronized with the supply voltage. At the moment of switching on the lighting, the voltage on the inverting - input of the comparator 23 is greater than the sawtooth voltage and the output of the first generator 7 is a voltage of logical zero, which is fed to the input of the second generator 8 and to the input of the logical element HE 12. Pulses from the generator output

25frequency filling at the input of the transistor switch 27 is not received, since the first input element 2I

There is a logical zero level. The AC key 1 is closed and no voltage is supplied to the fluorescent lamps 4.

On the secondary side of current sensor 30, the voltage is zero, since there is no current in the circuit of fluorescent lamps 4. The transistor switch 31 is closed, and at the output of the current control unit 9 there is a voltage of the logical unit that is supplied to the second input of the element 2I-NOT 13. The voltage of the logical unit is present at the first input of the element 2I-NOT 13, and the output voltage appears logical zero, which is fed to the control input of the switch 11. Opens the optotransformer 34, the transistor switch 35 and the power transistor 36. A circuit is formed for the passage of electric current; positive source bus

Nick 10 of the voltage, diodes 14 and 15, incandescent electrodes of fluorescent lamps 4, diodes 16 and 17, open power transistor 36 of the switch 11, the negative voltage bus of the source 10 of the voltage of the heat 10.

The filament electrodes of fluorescent lamps 4 are heated and thermoelectronic emission occurs on them, which helps to reduce the ignition voltage of the lamps. The voltage at the output of the integrator 20 and at the variable resistor 21 of the illuminator level adjuster 6 gradually increases, and at the output of the adder 22 gradually decreases. At the moment when the sawtooth voltage at the non-inverting input of the comparator 23 becomes greater than the control voltage applied to its inverting input, the level of the logical unit occurs at the output of the first generator 7. The output of the logical element NOT 12 causes a voltage of logical zero, which is fed to the first input of the logical element 2I-NOT 13.

The output of the element 2I-NOT 13 occurs the voltage of a logical unit. - The optotransistor 34, the transistor switch 35 and the power transistor 36 of the switch II are closed. The filament electrodes of the fluorescent lamps 4 are disconnected from the source 10 of the filament voltage source. At the same time, the input of the transistor switch 27 of the second generator 8 receives pulses from the output of the frequency filling generator 25, since at the first input of the element 2I 26 there is a level of logical one. At the output of the second generator 8, control pulses appear, which are fed to the control input of the alternating current key 1, the latter opens, and the fluorescent lamps 4 are supplied to the mains voltage pulse. The fluorescent lamps 4 are lit, after which the transistor switch 31 of the current presence control unit 9 opens, and the output of the current presence control unit 9 produces a logical zero voltage which is applied to the second input of the element 2I – NO 13.

At the moment when the network voltage passes through zero, the output of the first generator 7 produces a voltage of logical zero, which is fed to the input of the second generator 8 to the input of the logical element NO 2. Controlled by it

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The pulses at the output of the second generator 8 disappear, since a logical zero voltage appears at the first input of element 2 and 26, however, the AC key 1 is not turned off, because the current in the circuit of fluorescent lamps 4 is out of phase with respect to the supply voltage. When the current in the fluorescent lamp circuit decreases, the AC key 1 turns off. At the same time, the transistor switch 31 of the control unit 9 for the presence of current is closed, and a voltage of a logical unit occurs at the second input of the 2K-HE element 13. The output element 2I-NOT 13 occurs a voltage of logical zero. An optotransistor 34, a transistor switch 35 and a power transistor 36 are opened. A current flows through the filament electrodes of the fluorescent lamps 4. The heating of the filament electrodes of the fluorescent lamps 4 occurs every half-period of the supply voltage at the moment when the current through the fluorescent lamps 4 is zero.

The voltage at the output of the integrator 20 increases linearly, the angle of opening of the AC key 1 decreases from 180 ° to the value set by the variable resistor 21 of the setting of the 6 illumination level. An increase in the average value of the current flowing through the fluorescent lamps 4 occurs, and the larger the average value of the current flowing through the fluorescent lamps 4, the smaller the average value of the electrode current, as the duration of the current heating pulses of the filament electrodes decreases with decreasing key opening angle I. moment of inclusion os. When the opening angle of key 1 is close to 180 °, the average value of the current through fluorescent lamps is minimal, and the average value of the current of the electrodes is maximal. As the luminous flux increases and the average value of the current flowing through the fluorescent lamps, the average value of the filament current decreases. When the key opening angle is zero, the full supply voltage is applied to the lamps, the heating of the electrodes of the fluorescent lamps stops.

When the light is turned off, the switch 19 of the operating mode of the setting device 6 of the illumination level is set to

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position Disabled. The voltage at the output of the integrator 20 decreases linearly to zero. The opening angle of the AC key 1 is increased. The average value of the current flowing through the fluorescent paws and decreases. The lighting turns off smoothly. After the fluorescent lamps are extinguished, the voltage is removed from the supply bus of the device,

The proposed device provides stable control of the flux of fluorescent lamps from zero

to the nominal level of illumination, and also allows you to automatically turn on and off the illumination, i.e. create an artificial regime Dawn and Sunset. .

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The use of the proposed device allows the refusal to use filament transformers for each fluorescent lamp, which reduces the metal consumption and the dimensions of the lighting installation.

Claims (1)

Invention Formula A lighting device containing a controllable AC key, the first output of which is connected to the first output for connecting the power supply network, and the second connected to the first terminals of the ballast chokes by the number of lamps, the second outputs of which are connected to the first terminals of the first eight 0 five filament electrodes of the corresponding fluorescent lamps, the first terminals of the second filament electrodes of the fluorescent lamps are connected to the second output for connecting the supply network, the illumination level adjuster, the output of which is connected to the input of the first generator, the output of the first generator is connected to the input of the second generator, the output of which is connected to the control AC key input, characterized in that, in order to reduce metal consumption, dimensions and power consumption, a unit for controlling the presence of current lum is introduced into the device non-intrinsic lamps, a source of direct voltage, a switch, logical elements NOT, 2I-NOT and four diodes for each of the fluorescent lamps, and the output of the control unit for the presence of current of fluorescent lamps is connected to the first input terminal of the logic element 2I-NOT, the second input the output of which is connected through the logical element NOT to the output of the first generator, and the output of the logical element 2И-NOT is connected to the control input of the switch, the first are connected to one of the terminals of the source of the constant voltage The conclusions of all of the electrodes of fluorescent lamps, which second terminals through other diodes are connected to the corresponding one of the switch terminals, the other terminal of which is connected to the other terminal of the DC source voltage intensity. O / Tjf 5 oI ff UJ / 7 Compiled by M. Mkhitarov Editor A. Shandor Tehred M. Didyk Proofreader M. Kucher va Order 57 Circulation 656 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Subscription