KR830002176B1 - Discharge lamp lighting device - Google Patents

Abstract

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Description

Discharge lamp lighting device

1 is a circuit diagram of an apparatus for lighting a gas discharge lamp according to an embodiment of the present invention.

2A, 3A and 4A are waveform diagrams showing an AC voltage supplied from a phase control device.

2b, 3b and 4b are waveform diagrams showing the rectified voltage supplied to the inverter.

2c, 3c and 4c are waveform diagrams showing the high frequency voltage supplied to the primary winding of the leakage reactance transformer.

2d, 3d and 4d are waveform diagrams showing the high frequency voltage supplied from the secondary winding of the leakage reactance transformer to the fluorescent lamp.

2e, 3e and 4e are waveform diagrams showing a high frequency current supplied to a fluorescent lamp.

FIG. 5 is a circuit diagram of a gas discharge lamp and a manager lamp according to another embodiment of the present invention. FIG.

The present invention relates to a gas discharge lamp lighting device, and more particularly to a device for converting the continuous output of the power regulator into a high frequency voltage and the high frequency voltage thus obtained is supplied to the gas discharge lamp for the gas discharge lamp.

Gas discharge lamps that are lit at high frequency voltage, which are small, light in weight and have high light divergence efficiency, are already known. However, gas discharge lamps, which are optically controlled by a phase controller, the filaments are heated to an appropriate temperature, and lit by high frequency voltage, are not yet known. However, gas discharge lamps that are lit with a normal AC power source and light controlled as a phase controller are known. However, this light control device is large and heavy and has low light emission efficiency. In addition, this light control device requires a single lead connecting the input of the phase controller to a lighting device such as a gas discharge lamp.

Accordingly, a main object of the present invention is to provide a gas discharge lamp lighting apparatus which can supply heating current to a filament such as a gas discharge lamp while being small and light in weight.

For this and other purposes, the present invention provides a power supply, a device for controlling a power supply cycle of the power supply and generating an output voltage during the controlled power supply cycle, and a device for converting the power control device into a high frequency voltage. And an auxiliary power supply for supplying auxiliary power to the converter during at least each period between the power supply cycles and a gas discharge lamp lighting device which is powered by a high frequency output from the converter and whose filaments are heated. do.

The invention will be greatly understood from the following detailed description in conjunction with the accompanying drawings.

1, a high frequency voltage generator 2 is connected between a power controller or phase controller 4 and a fluorescent lamp 6 for controlling the phase angle of an alternating current supplied as is known. The power controller 4 is connected to the AC power source 8 via the power supply lines 10 and 12. The phase controller 4 is provided with a triac 14 connected to the power supply line 10. The series circuit composed of the variable resistor 16 and the capacitor 18 is connected in series with the triac 14 so that the triac 14 is energized at a randomly selected phase angle. The diac 20 is connected between the contact of the variable resistor 16 and the capacitor 18 and the gate of the triac 14. The power switch 21 is connected between the AC power supply line 10 and the triac 14. By varying the resistance of the variable resistor 16, the rectifier circuit 26 of the phase controller 4 and the device 2 is provided. The supply voltage of the phase angle is controlled to the two connection lines 22 and 24 connecting the (). According to the present invention, the AC power source may be replaced with a DC power source. If a direct current power source is used, the rectifier circuit 26 becomes unnecessary. The cloud controller is not limited to the form shown in the drawings. For example, a power control device is composed of switching elements, or transistors, which are DC voltages.

In order to convert the DC voltage supplied from the rectifier circuit 26 through the lines 27 and 28 into the high frequency voltage, the full wave rectifier circuit 26 is first connected to the inverter 30. The inductor is connected to the line 26 to prevent high frequency components from being supplied to the rectifier circuit 29. As shown in the figure, inverter 28 has a pair of push-pull transistors 32 and 34. The inverter 30 also has a primary winding 36 and a resonant capacitor 44 with a first and a second secondary winding 38 to contain high frequency voltages in the secondary windings 38, 40. Includes a transformer or leakage reactance transformer 42 connected to the primary winding 36. The fluorescent lamp 6 is connected to the secondary winding 40 of the transformer 42 through a socket (not shown). The filaments 44 and 46 of the fluorescent lamp 6 are connected between the terminal and the intermediate tab of the secondary winding 40 through the socket.

The high frequency voltage generator 2 includes a DC power supply 48 so as to supply heating current to the filaments 44 and 46 of the fluorescent lamp 6 even when the triac 14 is not energized. The DC power supply 48 has a transformer 52 connected to the connecting leads 22 and 24 to its primary winding and its secondary winding to the second full-wave rectifying circuit 50. 54 is connected to the output terminal of the full-wave rectifying circuit 50 to supply a DC current to the inverter 30 when the voltage across the line 27 decreases, and the capacitor 54 is connected to the line 27 through the diode 56. ), 28. For example, the turns ratio of the primary and secondary windings of the transformer 52 is less than the discharge duration voltage of the fluorescent lamp 6 and the triac 14 is not energized. It is set to charge the capacitor 54 with a voltage capable of supplying sufficient preheating current to the filaments 44, 46 of the fluorescent lamp 6 during the period of the state. no.

In the apparatus for turning on the fluorescent lamp of the above-described type, when the variable resistor 16 is set so that the fluorescent lamp 6 is turned on at the maximum power and the power switch 21 is closed, the alternating voltage as shown by the solid line in FIG. V ₁ is supplied from the phase controller 4 to the primary windings of the first rectifying circuit 26 and the transformer 52. Then, an alternating voltage as shown by the broken line in FIG. 2A is generated across the secondary winding of the transformer 52. The first rectifier circuit 26 rectifies the applied AC voltage and generates a full-wave rectified voltage at both ends of the lines 27 and 28. The voltage supplied to the line 27 by the circuit 26 is lower than the charging pressure of the capacitor 54 every cycle. In every cycle, the diode 56 is energized and a direct current is supplied from the capacitor 54 to the line 27. As a result, the voltage supplied from the capacitor 54 is superimposed on the rectified voltage of the first rectifying circuit 26 so that the voltage V ₃ as shown in FIG. 2B is provided at both ends of the lines 27 and 28. Is approved. The rectified voltage V ₃ shown in FIG. 2B is converted into a high frequency voltage of about 20-40 KHZ by the inverter 30 and applied to the primary winding 36 of the leaky actance transformer 42. Thus, the high frequency voltage V ₅ as shown in FIG. 2d is applied to the fluorescent lamp 6 through the secondary winding 40 of the transformer 42, and the high frequency current I ₅ as shown in FIG. 2e is the fluorescent lamp. Is applied to (6). When the high frequency voltage V ₅ shown in FIG. 2D reaches the discharge start voltage shown by the sign 58, the fluorescent lamp 6 starts to discharge, and then the lamp voltage is reduced to the discharge sustain voltage. During the period until the voltage V ₅ becomes below the discharge sustain voltage, the fluorescent lamp 6 continues to discharge at a high frequency voltage. When the high frequency voltage falls below the voltage at which the discharge shown by the sign 60 is interrupted, the fluorescent lamp 6 stops discharging.

When the variable resistor 16 of the phase controller 4 is set to light the fluorescent lamp 6 at 50% light control ratio, the light control AC voltage V ₁ whose phase angle is controlled as shown by the solid line in FIG. 3A is phased. It is applied from the controller 4 to the first rectifier circuit furnace and to the primary winding of the transformer 52. An alternating voltage V _2, as shown by broken lines in FIG. 3A, is applied to the rectifier circuit 50 to charge the capacitor 54. Since the diode 56 is energized whenever the voltage across the line 27 is lower than the preset voltage, a rectified voltage as shown in FIG. 3B is applied across the lines 27 and 28. As apparent from comparing FIG. 3A with FIG. 3B, voltage is applied from the DC power supply 48 to the lines 27 and 28 even while the triac 14 is not energized. The rectified voltage as shown in FIG. 3b is applied to the inverter 30 via the lines 27 and 28 and consequently the high frequency voltage as shown in FIG. 3c is applied to the primary winding of the leakage reactance transformer. Occurs at both ends of 36). As such, a high frequency voltage as shown in FIG. 3d is generated at both ends of the secondary winding 40 of the leakage reactance transformer 42 and the fluorescent lamp 6 discharges during the discharge period T ₂ and eventually extinguishes during the discharge interruption period S _2. do. A current having a waveform similar to that of FIG. 3d is supplied to the filaments 44 and 46 of the fluorescent lamp 6 by the DC voltage from the DC power supply 48 even during the discharge interruption period S ₂ . In this way, the filament current is constantly supplied to the filaments 40 and 46 of the fluorescent lamp 6 even if the triac 14 of the phase controller 4 changes to energized and non-energized states. In this way, the fluorescent lamp 6 starts to discharge accurately and turns on and off alternately even when the discharge interruption period S ₂ is in a relatively long 50% light control state.

In addition, when the phase controller 4 is set to a dark state of less than 20% and the non-conduction period of the triac 14 becomes long, voltages as shown in FIGS. 4A to 4D occur at various points in the circuit. Thus, a current having a waveform similar to that of FIG. 4d is supplied to the filament of the fluorescent lamp 6. In this way, the fluorescent lamp is turned on even in the state of 20% light control ratio. FIG. 4A shows the AC voltage applied from the phase controller 4, FIG. 4B shows the rectified voltage across the lines 27 and 28, and FIG. 4C shows the high frequency voltage supplied to the primary winding of the transformer 42. And FIG. 4d shows a high frequency voltage supplied from the secondary winding of the transformer 42 to the fluorescent lamp 6. In the figure, T ₃ denotes a discharge period and S ₃ denotes a discharge interruption period.

As is apparent from FIG. 4D, even during the discharge interruption period S ₃ , the voltage is supplied to the filaments 44 and 46 of the fluorescent lamp 6 so that the repetition and initiation of the discharge of the fluorescent lamp 6 is accurately performed in the light control state. 20% light control is maintained.

는 트라이악(14)이 점화되는 위상각을 표시하며 위상각

의 π에 대한 비로서 표시된다. Vc는 커패시터(54)이 충전전압을 가리키며, T_F는 예열전류가 형광등(6)의 필라멘트(44), (46)로 공급될때 필라멘트 온도이다 광제어비는 제어되지 않은 상태에서 빛의 세기가 100%로 취해졌을때 빛의 세기이다.As described above, sufficient current can be supplied to the lighting circuit 2 of the fluorescent lamp in order to preheat the filaments 44 and 46 in a low light control state and to supply a voltage lower than the discharge sustain voltage of the fluorescent lamp 6. DC power supply 48 is included. As such, the fluorescent lamp 6 may be lit in any light control state, for example, less than 10% light control. The following table shows the characteristics of one fluorescent lamp 6 in which the capacitor 54 has a capacity of 22 μF. Shows. In the table,

Is the phase angle at which the triac 14 is ignited

Is expressed as the ratio to π. Vc is the charge voltage of the capacitor 54, T _F is the filament temperature when the preheating current is supplied to the filament 44, 46 of the fluorescent lamp (6) Light control ratio is 100 the intensity of light in the uncontrolled state The intensity of the light when taken in%.

TABLE 1

As is apparent from the above table, the fluorescent lamp 6 is lit at various light control ratios in accordance with the present invention. In addition, as shown in FIG. 1, since the phase controller 4 and the high frequency voltage generator 2 are connected by the connecting leads 22 and 24, the phase controller 4 can be fixed away from other devices. There is no problem of incorrect wiring because the wiring is easier than the conventional fluorescent lamp control apparatus. In addition, the present invention can also be used in power devices, such as a conventional fluorescent lamp.

A modified embodiment of the present invention will be described with reference to FIG.

In FIG. 5, the same numbers as in FIG. 1 of the same parts are denoted, and their description is omitted. In the embodiment illustrated in FIG. 1, the rectifier circuit 50 is connected to the connection leads 22, 24 via a transformer 52. However, in the embodiment shown in FIG. 5, instead of the transformer 52, the leakage reactance transformer 42 also has a tertiary winding and is connected to the rectifier circuit 50 of the DC power supply 48. Since the fluorescent lamp control device shown in FIG. 5 is almost the same as the device shown in FIG. 1 except that the voltage is supplied to the rectifier circuit 50 by the transformer 42, the description of the operation is omitted. In the apparatus shown in FIG. 5, the transformer 52 shown in FIG. 1 is unnecessary, so that the lighting circuit 2 of this apparatus can be made smaller and cheaper. In this embodiment, when the phase controller 2 and the rectifier circuit 26 are assembled into one, the rectifier circuit 26 can be connected to the high frequency generator 2 by two wires.

Various modifications are possible without departing from the scope of the invention. For example, in the embodiment shown in Figs. 1 and 5, the circuit for charging the capacitor 54 is not limited to the full-wave rectifying circuit but may be a half-wave rectifying circuit. In addition, the charging voltage of the capacitor 54 need not be determined by the winding ratio of the transformer 52, but can be determined by other means, and the output voltage of the DC power supply can be arbitrarily set.

Claims (1)

An AC power source 8 for generating an AC voltage, a power control device 4 for controlling the phase angle of the AC voltage to generate a controlled output voltage during the power supply period in one half of the voltage of the power source, and An auxiliary power source 48 for generating an auxiliary voltage in at least one rest period between supply cycles, a converter 30 for converting the control output voltage and the auxiliary voltage into a high frequency voltage, and a filament biased by the high frequency voltage. A fluorescent lamp (60), wherein the supplied auxiliary voltage is lower than the discharge sustain voltage of the fluorescent lamp during the idle period and is sufficient to supply a heating current to the filament.

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