KR960001795B1 - Circuit for discharge lamp using ballast starter of multi lamp - Google Patents

Abstract

a noise eliminating unit for absorbing and eliminating noise in an inputted alternate current(AC) power; a rectifying unit and a filter unit for converting the AC power into a direct current(DC) power; a power transformer for rectifying the AC power to output the rectified power to the DC power; an oscillating unit for outputting a rectangular wave signal having two frequencies with the voltage dropped DC power; first and second output unit for outputting the DC power as a high frequency AC signal; a switching unit for selectively outputting the DC power to two common output lines of first and second switches; and a plurality of lamp lighting units having a plurality of inverters and a plurality of condensers which each are installed on lamps connected in parallel with the two common output lines.

Description

Multiple lighting circuit of discharge lamp ballast

1 is a circuit diagram of a conventional fluorescent lamp lighting device.

2 is a circuit diagram of a conventional ballast lighting circuit for multi-discharge lamps.

3 is a circuit diagram of a power supply circuit of the present invention.

4 is a circuit diagram of a discharge lamp of the present invention.

5 is a detailed circuit diagram of an oscillator of the present invention.

Figure 6 is a waveform diagram showing the operation of the present invention.

* Explanation of symbols for main parts of the drawings

21: noise removing unit 22: rectifying unit

23: filter section 24: power transformer section

25, 26: oscillation unit 27, 28: output unit

29: switching unit 30, 30a, 30b, 30c: lamp light unit

31: oscillation IC

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple lighting circuit of a discharge lamp ballast, and more particularly, to a multiple lighting circuit of a discharge lamp ballast in which a plurality of discharge lamps are connected and connected in parallel to two output lines while preventing excessive current flow.

In general, a discharge lamp such as a fluorescent lamp is a light source lamp that converts electrical energy into light energy by using a discharge phenomenon, which is a well-known fact that the lighting circuit of the ballast is required due to the negative resistance characteristic at the time of lighting. Therefore, conventionally, the output side of the bridge diode 1 connected to the AC power source AC through the fuse F1 and the main power switch SW1 so as to light up the lamps 2 of the discharge lamps one by one as shown in FIG. To the smoothing capacitor C3, the switching transistors Q1 and Q2 are connected in series to the smoothing capacitor C3, and the resonant capacitors C1 and C2 are connected in parallel. The switching transistors of the capacitors C1 and C2 are connected through the electrode 2a of the lamp 2 and the discharge start capacitor CO, the electrode 2b of the lamp 2, and the resonance inductor L0. Connect to the emitter connection point of (Q1) and (Q2) and the DC power supply ground, and connect the output side of the triangular wave oscillator 4a to the non-inverting input terminals (+) and (+) of the comparators 4b and 4c. In addition, the positive reference voltage (V + ref) is connected to the inverting input terminal (-) of the voltage comparator 4b so that the output terminals of the voltage comparators 4b and 4c are amplified with current. Through (4d), (4e) respectively connected to the base of the switching transistor (Q1), (Q2).

On the other hand, after connecting the primary winding of the transformer T1 to the input side of the bridge diode 1, the secondary winding thereof is connected to the drive voltage supply circuit section 3 to output the voltage comparators 4b and 4c. A terminal is connected to the bases of the switching transistors Q1 and Q2 via current amplifiers 4d and 4e, respectively.

On the other hand, after connecting the primary winding of the transformer T1 to the input side of the bridge diode 1, the secondary winding thereof is connected to the drive voltage supply circuit section 3, and the positive low voltage of the drive voltage supply circuit section 3 is connected. (Vcc) and a negative low voltage (Vee) are applied as a drive voltage to the drive connection terminal 4 composed of the triangular wave oscillator 4a, the voltage comparators 4b, 4c, the current amplifiers 4d, and 4e. The triangular wave oscillator 4a outputs a square wave of several tens of KHz so as to minimize the switching loss while improving the luminous efficiency of the lamp.

However, according to the conventional fluorescent lamp lighting device as described above, the amount of harmonics is reduced and the blackening phenomenon due to the heat generation of the lamp 2 is hardly generated. Since only the lamp for the discharge lamp (2) is to be turned on in offices that use a lot of lamps for the discharge lamp (2), the number of lighting devices should be installed as much as the number, there was a disadvantage that the installation cost increases.

In order to solve the above disadvantages, as shown in FIG. 2, in order to improve the power factor at the AC power supply terminal, the inductor L10 is connected to the known bridge rectifier circuit 10 through a circuit connecting the capacitor C10. Through the resistors R10 and R11 through the filter circuit 11 including the capacitor C11 and the inductor L11 at the DC power supply terminal of the bridge rectifier circuit 10, the die solution DA and the capacitor C12 and By connecting the starter circuit 12 constituting the resistor R12, the output of the starter circuit 21 passes through the capacitor C13 and the first switching circuit constituting the transistor Q10, the resistor R13, and the diode D10. 13), and is connected to the primary winding N1 of the transformer Q10 through the resistor R14 at the terminal of the resistor R10 so that the secondary winding N3 is connected to the first switching circuit 13. The secondary winding N2 is connected to the input terminal of the second switching circuit 14 including the transistor Q11, the diode D11, and the resistor R15, and the first and second switches. It is connected to the inductors L12 to L14 through the variable inductor VL at the outputs of the circuits 13 and 14, and the capacitors C14 and C15 and the diodes D12 and 13 are connected to the DC power terminals. Connect the capacitors C16 to C18 at the terminal points between them, connect the inductors L12 to L14 and the capacitors C16 to C18, and connect the inductors L12 to L14 and the capacitors C16 to C18. By connecting the lamps LP1 to LP3 in which the capacitors LC1 to LC3 are connected in parallel, the load LD made up of the capacitors LC1 to LC3 and the lamps LP1 to LP3 is turned on.

However, in the conventional ballast lighting circuit for multi-discharge lamps as described above, the switching high frequency resonance of the two switching circuits 13 and 14 occurs, and the lamps are turned on to light three or more lamps while reducing power consumption. When the transistors Q19 and Q11 are sequentially turned on and off, the capacitors C16 to C18 connected in series with the inductors L12 to L14 on the output side resonate in series and are subjected to vibration at a voltage as high as Q times. In order to output in parallel, the number of electrode wires must be drawn out to the ballast lighting circuit as many as the number of discharge lamps to be lit, and the number of electrode wires is also increased. In addition, two wires are drawn between two contacts A and B. When the plurality of lamps are turned on, the inductors LC1 to LC3, the inductors L12 to L14, the capacitors C16 to C18 and the capacitors C14), (C15), etc. Since one known frequency is set, the corresponding load should be reduced when there is a lamp that is not in use, but only part of it is reduced and the remaining load is supplied to the lamp in other lighting conditions, which shortens the life of the lamp and increases the power consumption. There was a problem.

Accordingly, an object of the present invention is to provide a multi-light lighting circuit of a discharge lamp ballast to light a plurality of discharge lights in parallel through two output lines in one ballast.

In order to achieve the above object, the present invention removes the noise component of the AC power input and converts the DC power into the DC power supply, and supplies the output to the output unit. And outputs a square wave whose frequency changes accordingly, and in the output transformer of the output section to which the square wave is applied to the primary side, respectively, by alternately operating two transistors on each of the secondary windings having reverse polarity. By interlocking switches, two output units can be selectively operated, and a plurality of discharge lamps each having an auxiliary ballast can be lit in parallel.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram illustrating a power supply circuit of the present invention, and includes a TNR (TNR) and an inductor (L20) for removing noise such as a surge from an AC power supplied through a power switch SW11 and a fuse F11. , A noise removing unit 21 consisting of (L21) and condensers (C20), (C21) and (C22), and a diode (D20) for converting AC power via the noise removing unit 21 into a DC power source, A rectifier 22 for full-wave rectification consisting of (D21), (D22), (D23) and a capacitor (C23), and a DC power supply from the rectifier (22) to receive a capacitor (C24), (C25) and a diode (D24). ), (D25), (D26), the filter side 23 to improve the power factor as well as the noise removal, and the secondary side of the transformer (TRS) receiving the AC power from the noise removal unit 21 to the primary side The power supply transformer 24 outputs the DC power supply voltage dropped through the diodes D27 and D28, and when the voltage drops from the power supply transformer 24, DC power is received. The oscillation section 25, 26 for oscillating and outputting square wave signals of two frequencies during operation and normal operation, and the square wave signals from the oscillation sections 25, 26 are primary sides N1a, N1b. Outputs 27 connected to the bases of the output transistors Q20, Q21, Q22, Q23 at the secondary sides N2a, N2b, N2c, N2d of the transformers T20 and T21 respectively input to the outputs. And (28) and an output unit in which a DC power supply via the filter unit 23 is connected in series via the fuses F12 and F13 at terminals A and B of the switch SW20, respectively. Two switches interlocked with the switch SW20 on the output side of the output section 27, 28 while being supplied to the collectors of the transistors Q20, Q21, Q22, Q23 of (27), (28) A switching unit configured to be connected via a positive common output line Line 1 through SW21 and SW22 and a negative common output line Line 2 grounded through a capacitor C26. 29) and in parallel with the two common output lines (Line 1), (Line 2) An inductor (L21), (L21a), (L21b), (L21c) as shown ... Lamps LP20, LP20a, LP20b, LP20c ... To the capacitors C27, C27a, C27b, C27c. These lamps are composed of lamp lighting units 30, 30a, 30b, and 30c which have a function of an auxiliary ballast by connecting them in parallel.

Here, the secondary sides N2a and N2b and N2c and N2d of the transformers T20 and T21 are wound to have reverse polarities, respectively.

As shown in FIG. 5, the oscillation section 25, 26 has the voltage drop of the DC power supply from the power supply transformer section 24 being the electrolytic capacitor C28, the resistor R20, and the diode D27. Connected to the base of transistor Q24 via a collector-emitter of transistor Q24, causing the two photocouplers PC1, PC2 in series to be turned on, connected in parallel A square wave signal is output from a conventional oscillation IC 31 to which the time constant elements of the resistor R2 and the capacitor C29 are connected via the resistor R21 in the phototransistors PC1 and PC2.

In the multiple lighting circuit of the discharge lamp ballast of the present invention configured as described above, when the switch SW20 of the switching unit 29 is switched to the terminal A, the switch SW21, which is a contact that is interlocked by the switch SW20, is turned on and the switch ( SW22 is turned off so that power through terminal A is fed through fuse F12 and output 27 is supplied to both transistors Q20 and Q21 and not to output 28 at the same time. When the switch SW20 is connected to the terminal B, the switch SW21 is turned off and the switch SW22 is turned on so that the power supply through the terminal B passes through the fuse F13 and the two transistors of the output unit 28 are connected. By being supplied to (Q22) and (Q23) and being supplied to the output unit 27, when the output unit 27 or 28 is abnormal, the switch 20 of the switching unit 28 is selectively operated. , The AC power applied through the switch SW11 and the fuse F11 is input to the noise removing unit 21 to obtain a capacitor ( C20) is partially absorbed by the high frequency noise component and then completely absorbed by the capacitors C21 and C22, and passes only the AC component of 60 Hz, and again the bridge diodes D20 to D23 of the rectifier 22, and It is full-wave rectified by the capacitor C23, and is converted into a DC power supply.

Since the rectifier 22 is changed to the DC power supply in the pulsed state, the DC power supply in the pulsed state is changed to a stable DC power by charging and discharging the capacitors C24 and C25 of the filter unit 23 again. At the same time, the power factor of the input power source is improved while the pulses overlap in the diodes D24, D25, and D26.

On the other hand, AC power from the noise canceling unit 21 is applied to the primary side of the transformer TRS of the power transformer unit 24, and the voltage is dropped appropriately according to the turns ratio on the secondary side, and then again two diodes D27 and D28. Half-wave rectified and supplied to the oscillators 25 and 26 by a voltage-dropped DC power supply.

The oscillation sections 25 and 26 have the same structure, and as shown in FIG. 5, the bias power supply by the resistor R20 turns on the transistor Q24 only while the supplied DC power supply is charged in the capacitor C28. Therefore, DC power flowing through the collector-emitter thereof drives the photocouplers PC1 and PC2 in series connection, and accordingly, the power flowing through the parallel connected phototransistors of the photocouplers PC1 and PC2. The oscillation IC 31 oscillates a square wave signal of 40 KHz to 45 KHz according to the time constant value determined by the resistors R21, R22 and the capacitor C29.

After the charging of the capacitor C28 is completed (about 0.5 seconds to about 2 seconds), the transistor Q24 is turned off to stop the driving of the photocouplers PC1 and PC2. When the connection state of the resistor R21 is disconnected, a square wave signal of 25KHz to 30KHz is oscillated and output in accordance with the time constant value determined by the resistor R22 and the capacitor C29 which are original time constant elements.

In other words, the inductor (L21, L21a, L21b, L21c) and capacitor of FIG. 4 are configured to oscillate and output the long-wave square wave signal after a predetermined time (0.5 to 2 seconds) while oscillating the short-wave square wave signal. In the initial stage when the IC resonance value and the value of C27, C27a, C27b, and C27c are different from each other, the current flows less. Therefore, the excessive current does not flow during the first predetermined time when the power switch SW11 is turned on. , LP20a, LP20b, LP20c) preheats only the filament of the anode without being turned on at the beginning of the current flow, and then turns on by the normal current after a predetermined time.

Since the secondary sides N2a, N2b, N2c, and N2d of the transformers T20 and T21 are wound in reverse polarity with each other, an induced voltage generated proportionally stepped down is generated according to the turns ratio, thereby output transistors Q20 and Q21. , Is applied to the bases of (Q22, Q23).

If the switch SW20 is connected to the terminal A in a switched state, the switch SW21 is in an on-switch SW22 in an off state, and accordingly, the output unit 28 passes through the fuse F13 to supply DC power. At the same time, the connection to the common output line (Line 1) of the positive (4) is cut off so that it is not operated.

The DC power supply via the terminal A of the switch SW20 is supplied to the collector of the transistor Q20 via the fuse F12.

At this time, since the square wave, which is a clock having a short period (2 μsec), is applied to the primary side N1a of the transformer T20 as shown in (a) of FIG. 6 in the oscillator 25, the positive square wave is positive. Is applied to the primary side of the transformer T20, and if a positive (+) square wave is applied to the primary side of the transformer T20, the secondary side N2a wound with positive polarity is A positive signal is induced to turn on the transistor Q20, as shown in Fig. 6A, and at the same time, a negative side is wound on the secondary side N2b wound with a negative polarity as shown in Fig. 6C. A negative signal is induced to turn off transistor Q21.

Therefore, a plurality of lamps LP20 and LP20a connected in parallel with the fuse F12 at the terminal A of the switch SW20, the collector-emitter of the transistor Q20 and the DC power flowing through the switch SW21 are connected in parallel. ), (LP20b), (LP20c)... After being charged, the capacitor L26 of the negative common output line (Line 2) is charged and grounded.

After a short period of 2 μsec, when the oscillation section 25 is applied with a square wave of " 0 " to the primary side N1a of the transformer T20 as shown in FIG. 6A, it is wound with a positive polarity. A negative signal is induced on the secondary side N2a as shown in FIG. 6B to turn off the transistor Q20 and at the same time as shown in FIG. 6C. A positive signal is induced on the secondary side N2b wound with the polarity to turn on the transistor Q21.

Therefore, a plurality of lamps LP20, LP20a, LP20b, LP20c, etc., in which a DC power source charged in the capacitor C26 of the negative common output line Line 2 is connected in parallel. After passing through, the signal is grounded through the positive common output line (Line 1) and through the collector-emitter of transistor Q21.

On the other hand, if the switch SW20 is switched to the terminal B, the switch SW21 is turned off and the switch SW22 is turned on. Accordingly, the output unit 27 passes through the fuse F12 to DC. At the same time, power is not supplied and the connection to the positive common line (Line 1) is cut off and it does not operate.

The DC power supply via the terminal B of the switch SW20 is supplied to the collector of the transistor Q22 via the fuse F13.

At this time, since the square wave, which is a clock having a short period (20 μsec), is applied to the primary side N1b of the transformer T21 as shown in (d) of FIG. 6 in the oscillator 26, the positive square wave is positive. Is applied to the primary side of the transformer T21, a positive signal is induced to turn on the transistor Q22 and at the same time the secondary side N2b wound with a negative polarity (bar) of FIG. A negative signal is induced to turn off transistor Q23 as shown in FIG.

Therefore, the plurality of lamps LP20 and LP20a connected in parallel with the fuse F13 at the terminal B of the switch SW20, the collector-emitter of the transistor Q22 and the DC power flowing through the switch SW22 are connected in parallel. ), (LP20b), (LP20c)... After being charged, the capacitor L26 of the negative common output line (Line 2) is charged and grounded.

If a square wave of "0" is applied from the oscillator 25 to the primary side N1b of the transformer T21 after a short period of 2 μsec, a negative signal is applied to the secondary side N2c wound with a positive polarity. Is induced to turn off the transistor Q22 and at the same time a positive signal is induced on the secondary side N2d wound with a negative polarity to turn on the transistor Q23.

Therefore, a plurality of lamps LP20, LP20a, LP20b, LP20c, etc., in which a DC power source charged in the capacitor C26 of the negative common output line Line 2 is connected in parallel. After passing through, it passes through the positive common output line (Line 1) and is grounded through the collector-emitter of transistor Q23.

The high frequency alternating current signal, which is switched back to alternating current by the output transistors Q20, Q21 and Q22 and Q23 of the output units 27 and 28, depends on the connection state of the switch SW20 of the switching unit 29. It is selectively outputted, and the positive common output line (Line 1) and the negative common output line (Line 2) are converted into pure high frequency AC signal by the DC blocking characteristic by the charge / discharge of the electrolytic capacitor (C26). Is output via

Therefore, as shown in FIG. 4, the lamp lighting units 30 of the inductors L21, L21a, Lb21, L21c and capacitors C27, C27a, C27b, and C27c, In the lamps LP20, LP20a, LP20b, and LP20c, each of which 30a, 30b, and 30c are provided as auxiliary stabilizers, input of the high frequency AC signal and the inductors L21 to L21c, respectively. ) And the auxiliary ballasts of the capacitors C27 to C27c. At this time, the frequency of the high frequency alternating signal and the values of the resonance frequencies of the inductors L21 to L21c and the capacitors C27 to C27c. In this way, the filament currents of the lamps LP20 to LP20c are properly supplied while the inductors L21 to L21c are kept in an unsaturated state, thereby preventing internal overheating.

The high frequency AC signal is caused to resonate with the auxiliary ballasts of the lamp lighting units 30 to 30c provided in each of the lamps LP20 to LP20c, and the inductors L21 to L21c do not become saturated. This prevents the inductors L21 to L21c from overheating in saturation and also prevents a phenomenon that a load of a lamp not being used is supplied to a lamp in another lighting state.

Instead of the output transistors Q20 to Q23 used for the output sections 27 and 28 of the present invention, a FET, an IGBT, or the like may be used.

Therefore, in the multi-lighting circuit of the discharge lamp ballast of the present invention, by converting the AC power to the DC power supply to the output unit while outputting the two square wave signals to the output unit from the oscillator receiving the DC power to the voltage-dropped DC power Amplified high frequency signal is output from the output unit and resonates with the lamp lighting units of the lamps connected in parallel, stably lighting a plurality of lamps, and by switching the two oscillating units and the output unit alternately to operate for a long time safely. It can be used.

In addition, since two common output lines are output in parallel to each of the lamps for installing lighting switches, which are not shown in the drawing, or several, if necessary, the existing wiring work can be simply installed or used for the first time.

Claims (3)

In the multi-lighting circuit of a discharge lamp ballast, a noise removing unit 21 for absorbing and removing noise of an AC power input and an AC power supply via the noise removing unit 21 are replaced with a DC power source having an improved power factor. A rectifying section 22 and a filter section 23 for outputting, a power supply section 24 for full-wave rectifying and outputting the AC power from the noise removing section 21 to a DC power supply, and the power supply transformer 24 Oscillation section 25, 26 for outputting square wave signals having two frequencies with respect to the voltage-dropped DC power input from the transformer; and the transformer T20 according to the square waves from the oscillation sections 25, 25; The DC power supply via the filter unit 23 is turned into a high frequency AC signal while the transistors Q20, Q21, and Q22 and Q23 are alternately turned on and off with the induced voltage of the secondary side wound with the reverse polarity of T21. Switch with outputs 27, 28 and contacts A, B, To the two common output lines (Line 1) and (Line 2) by switches SW21 and (SW22) interlocked while selectively supplying DC power to the two output units 27, 28 by means of the value SW20. A switching unit 29 for selectively outputting a high frequency AC signal and an inductor L21 provided one by one in the lamps LP20 to LP20c connected in parallel to the two common output lines Line 1 and Line 2 described above. And (L21c) and a lamp lighting unit (30) to (30c) consisting of capacitors (C27) to (C27c). According to claim 1, The oscillator (25), 26 is a DC power source of the power supply transformer 24, both through the electrolytic capacitor (C28) and the resistor (R20) and diode (D27) to the base of the transistor (Q24) The photocouplers PC1 and PC2 are connected in series to the emitter of the transistor Q24 which is applied and the DC power source is applied to the collector, so that the time constants of the oscillation IC 31 are resistors R21, R22 and A multi-lighting circuit of a discharge lamp ballast characterized in that it is determined by the coupling of the capacitor (C29) or the coupling of the resistor (R22) and the capacitor (C29). The frequency of the inductors L21 to L21c and the capacitors C27 to C27c of the lamp lighting units 30 to 30c respectively provided in the lamps LP20 to LP20c. A discharge lamp characterized in that the value does not coincide with the frequency of the high frequency AC signal output through the common output lines Line 1 and Line 2 during resonance to prevent saturation of the inductors L21 to L21c. Multilighting circuit of ballast.