RU2175818C1 - Starting and controlling apparatus to supply gaseous-discharge lamps - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: starting and controlling apparatus to supply power to gaseous-discharge lamps has power supply unit with D C source, inverter, starting current generator, inductive-capacitive ballast circuit and ignition unit of gaseous-discharge lamps. Inverter incorporates adder, two control keys and timer, control unit and generator connected in series. Apparatus is fitted with transmitter of rise of voltage across lamps, transmitter of fall of voltage across lamps, transmitter of voltage across inner filaments of lamps and transmitter of open-circuit of lower filament of lamps. Above-mentioned transmitters are connected to hysteresis adder, starting current generator is connected to D C source and incorporates limiting resistors, field-effect transistor, reference voltage elements. filtering capacitor and current resistor. With start of apparatus starting generator energizes controlling circuits of inverter and secures operation of its keys, power supply to high-frequency rectifier that feeds constant voltage supply source and disconnects starting current generator. EFFECT: raised operational reliability of starting and controlling apparatus, reduced consumption of electric energy by apparatus. 1 dwg

Description

 The invention relates to electrical engineering, mainly to electronic ballasts for powering discharge lamps.

 Closest to the invention in technical essence and the achieved result is a ballast for feeding gas discharge lamps, comprising a power supply unit with a direct current source, an inverter, a starting current generator, an inductive-capacitive ballast circuit and an ignition unit for gas discharge lamps (see patent RU 2094964 C1 , CL H 05 B 41/29, publ. 10/27/1997).

 The specified ballast provides power to discharge lamps. However, in some cases, for example, when the voltage drops below the permissible limit, the required reliability is not provided.

 The problem to which the present invention is directed, is to increase the reliability of the ballast and the power consumption of the ballast to power discharge lamps.

 This problem is solved due to the fact that the ballast for supplying discharge lamps comprises a power supply unit with a direct current source, an inverter, a starting current generator, an inductive-capacitive ballast circuit and an ignition unit for discharge lamps, while the inverter includes an adder, two control keys and in series connected timer, control unit and generator, and the apparatus is equipped with a sensor for increasing voltage on the lamps, a sensor for decreasing voltage on the lamps, a voltage sensor on the inner filament of the lamps and a low-voltage cut-off lamp, while these sensors are connected to the adder, the starting current generator is connected to a direct current source and includes limiting resistors, a field effect transistor, reference voltage elements, a filter capacitance and a current resistor, and when the device starts up, the start generator is powered by control circuits the inverter with the inclusion of the operation of its keys and the supply of power to a high-frequency rectifier, supplying a constant voltage source and disconnecting the old ovogo alternator.

 Studies of the operation of ballasts for powering gas discharge lamps, mainly devices for powering two or four gas-discharge lamps, it was found that the operation mode of the device during the start-up period and the control of the lamp operation mode while maintaining the lamp burning mode have a significant influence on the reliability and power consumption of the ballast control device . In particular, in addition to the control modes for increasing the voltage on the lamps and monitoring the breakage of the lower filament of the lamps, it is also necessary to control, in combination with the above parameters, the decrease in the voltage on the lamps and the voltage on the internal filament of the lamps, and this control is important not only during the operation of the lamps. The organization of the start-up process, namely the use of the start-up generator in conjunction with the organization of control and the subsequent shutdown of the start-up generator when starting the high-frequency rectifier, can almost completely eliminate the failure of the lamps in violation of the specified operating mode of the ballast, and also prevent the failure of the elements of the ballast.

 The drawing shows a schematic diagram of the described ballast for powering discharge lamps.

 The control gear for supplying gas discharge lamps comprises a power supply unit, which consists of a rectifier 1 and a direct current source 2, a current generator 3, an inductive-capacitive ballast circuit, including a separation capacitor 4, inductor 5, and capacitances 6, 7 connected in series with it glow transformer 8. The inverter includes a control unit 13 and a generator 14, output keys 10, 11, as well as additional devices, such as a timer 12 and an adder 9. In addition, the ballast is equipped with an increase sensor voltage on the lamps 15, the voltage reduction sensor on the lamps 16, the voltage sensor on the inner filament of the lamps 17 and the sensor for breaking the lower filament of the lamps 18, while these sensors 15-18 are connected to the adder 9. The adder 9 is connected to the timer 12 and the control unit 13. The starting current generator 3 is connected to the power supply through the diode 23, as well as to a constant current source 2, and its output powers the control circuits of the inverter. The starting generator 3 consists of a limiting resistor, a high-frequency alternating voltage rectifier coming from the inductor 22, a field-effect transistor, a reference voltage element, a filtering capacitance, and a current resistor, and when the device is started, the starting current generator at the initial moment feeds the inverter control circuits from the power supply through the diode 23 and a limiting resistor. After starting the inverter, the high-frequency voltage at the inverter output is rectified by the high-frequency rectifier 19 and feeds the control circuits of the direct current source 2, which is turned on and stabilizes the power supply voltage of the inverter, and also supplies the high-frequency voltage from the winding of the inductor 22 to the current generator 3. At the same time, the current generator 3 switches from the power voltage of the pre-feeding to the voltage that comes from the inductor 22. This is done in order to drastically reduce energy loss, and the trace quently, and heat loss.

 After turning on the power supply unit of the inverter, which consists of a rectifier 1 and a constant current source 2, it runs a timer 12 in a given period of time, ensuring the maximum operating frequency. At this frequency, the lamp or lamps (two lamps 20 and 21 are indicated on the diagram, however, the described circuit can be optimized for one lamp and 4 lamps, i.e., the number of lamps required by the need) do not light up, and their glows are heated. Next, the timer gives a signal to the control unit 13, which lowers the frequency of the generator 14, the frequency becomes close to the resonant frequency of the series resonant circuit, consisting of a choke 5, capacitors 6 and 7 and a glow transformer 8, and these capacitors, a glow transformer and a choke are connected in series, and the lamps 20 and 21 are parallel to the capacitors and the filament transformer 8, while the lamps themselves are connected in series, and their central filaments are connected to the winding of the filament transformer 8. For For alternating current passing through the keys 10 and 11, a control unit 13 and a generator 14 are used, which supply control pulses of the required frequency, for example 50 kHz, which alternately open the keys 10 and 11. When the inverter frequency becomes close to the resonant one, the lamps 20 and 21 are ignited, while sensors 15-18 are included in the work.

 The voltage increase sensor on the lamps 15 is connected to the secondary winding of the resonant inductor 5 and, in case of an increase in voltage on the lamps, gives a signal to the adder 9.

 The voltage reduction sensor on the lamps 16 is connected to the upper filament of the lamp 20, measures the total voltage on the lamps and, if it is reduced, gives a signal to the adder 9.

 The voltage sensor on the inner filament of the lamps 17 is connected to a separate winding of the filament transformer and in the event of a break in the filament gives a signal to the adder 9.

 The sensor for breaking the lower filament of the lamp is connected to the lower filament of the lamp 21 and, if it is interrupted, gives a signal to the adder 9.

 In the case of deviation of the lamp performance or breaks in the filament on the lamps, one or another of the sensors 15-18, or several sensors, is triggered simultaneously, while the signals from them are fed to the adder 9.

 In turn, the adder 9 gives a trip signal to the control unit 13, and since the adder is equipped with a time delay unit of the order of 10-12 seconds, and after this time the adder 9 sends a signal to the timer 12 to restart the inverter.

 As long as the delay to restart is worked out in the adder, the starting current generator 3 switches the power supply of the inverter logic control circuits to power supply, while the constant current source 2 is turned off and is in the off state until the inverter is restarted. After the totalizer delay time has elapsed, the entire start-up process is repeated anew.

 The described ballast for powering gas discharge lamps can be used wherever it is required to ensure reliable operation of lighting based on gas discharge lamps.

Claims (1)

 A control gear for powering discharge lamps, comprising: a power supply unit with a direct current source, to which the keys of an inverter equipped with a control unit and a generator are connected; a series resonant circuit formed by a choke, capacitors and an incandescent transformer associated with the heating electrodes of gas-discharge lamps, and a voltage increase sensor on the lamps, characterized in that it is additionally equipped with a lamp voltage decrease sensor, a voltage sensor on the inner filament of the lamps, a low-voltage cut-off sensor lamps, totalizer; all of these sensors are connected to the adder and in case of deviation of the operating characteristics of the voltage on the lamps, the inverter is switched off by the signal of the adder.