JPS58137992A - Device for firing discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that uses an inverter to convert power from a DC power source into high frequency power and applies the power to a discharge lamp such as a fluorescent lamp to light it.

2. Description of the Related Art Conventionally, there has been a device as shown in FIG. 1 as a device for converting power from a DC power source into a high frequency of several KHz or higher using an inverter to light a discharge lamp such as a fluorescent lamp.

In Figure 1, (1) is a commercial frequency AC power supply.

(2) C is a full-wave rectifier, and (3) is an inverter, which here is composed of a self-excited transistor inverter equipped with an output transformer (6). (4) Mako's inverter (
3) is a control device that controls the operation. (5) is a discharge lamp, and (5M) I (5B) is an electrode.

Nao, inverter (31Fi collector winding (6C), Heas feedback winding (6B), filament winding 11 (6F)
, an output transformer (6B) consisting of a secondary winding (6B)
), an inductance ()) connected to the midpoint of the collector winding (6C) and the output side of the full-wave rectifier (2),
Transistor (8M), (8B), the above transistor (
8A).

(8B) base resistance (9μ) I (9B) to the next winding (6
A resonant circuit of a capacitor ae connected in parallel with S), a choke coil (2) also connected in series with the secondary winding, and an inductance (9 μm) I connected in series with the filament winding (61'). (9B).

The control device (4) also includes a transformer wheel connected to the AC power source (1), a full-wave rectifier α for rectifying the output of the transformer l, and a resistor AS connected to both output ends of the full-wave rectifier a4. and a trigger element a with one terminal connected to the connection point of this resistor and capacitor.
A diode brocade whose anode is connected to the other terminal of this trigger element fin.

The anode is the emitter of the above transistor (8A).

It consists of a thyristor shaft as a switching element whose cathode is connected to the negative terminal of the full-wave rectifier (I4) and whose gate is connected to the cathode of this diode, and a timer device 4,
The output signal of this control device (4) is
9B) t-, the above transistor (8M), (8B
) is input to the base of

Further, the timer device (2) includes a series circuit of a diode cJ connected to the output terminal of the full-wave rectifier α4 and an electrolytic capacitor (2), and a resistor (2) connected in parallel with the electrolytic capacitor (2). ) and a capacitor (goods), a connection point between this capacitor (goods) and a resistor (2), and a series circuit of a Zener diode (c) and a diode (to) connected between the gates of the thyristor. It will be done.

Next, a detailed operation will be explained. When AC power (1) is supplied, a voltage as shown in Fig. 3 (A) is applied to the inverter (3) via the full-wave rectifier (2). A predetermined voltage is also generated at I, and a pulsating DC voltage that is also full-wave rectified is supplied from the full-wave rectifier shaft. Resistor al and capacitor 41. )
The trigger element (Iη operates similarly to a well-known phase control pulse generator).

AC power supply (with a predetermined phase every half cycle of 11).

For example, a trigger pulse is generated at the phase indicated by 01 in FIG. 2(A). For this reason, the switch element axis.

(Here it consists of a thyristor.).

Conductive in phase 01 through resistors (9A) and (9B).

Transistors (8A), (8B) of inverter (3)
) continues to supply the base current to the 9th phase up to around θ0.

During the period when this base current is supplied, the DC output of the full-wave rectifier (2) is applied to the collector winding (6C) of the output cadence (6) via the inductance (7) t-, and the output cadence is Due to the action of the base feedback winding (6B) in (6), the transistors (8A) and (8B) alternately repeat opening and closing to start one oscillation, and each winding of the output transformer (6) Generates a high frequency AC voltage as shown in (b).

- At this time, the electrodes (5A) and (5B) of the discharge lamp (5)
is the filament winding (
It is preheated by the output voltage of 6F). However, the voltage applied from the secondary winding (6B) to both ends of the discharge lamp (5).

Since it is insufficient to start discharging the discharge lamp (5),
! 1, the discharge lamp (5) does not light up.

After preheating of this electrode (5M) and (5B) has started.

After a predetermined period of time has elapsed, the timer device (
Resistor C to the capacitor (goods) of (To)! The voltage charged through 1 exceeds the zener voltage of the zener diode (c). For this reason, thyristor a chicken is diode cja
Since it receives a continuous trigger signal via the AC power supply (1), the thyristor is conducting for almost the entire period of the AC power supply (1). Therefore, the transistors (8M) and (8B) of the inverter (3) also operate accordingly, and a voltage as shown in FIG. 3(C) is generated in each winding of the output transformer (6). At this time.

The electrodes (5M) # (5B) of the discharge lamp O. are already heated by the middle molecule, and the discharge lamp (5) lights up.

In this way, the discharge lamp (5) is turned on, and the inverter (3) changes the angle from θ1 to 00 as shown in Figure 2 (b).
The electrode (5) of the discharge lamp (5) oscillates for a period of time.

When preheating (5B), if the preheating voltage is set to a voltage sufficient to preheat electrodes (5B) and (5B), the operation of timer circuit 4 ends and inverter (3) As shown in Figure 2 (C), the voltage generated in the preheating winding (61P) when the AC power supply (1) oscillates for almost the entire period and the discharge lamp (51) is lit is also the same as that of the AC power supply (11). However, the present invention does not solve the above-mentioned drawbacks. The purpose of this invention is to provide a device that can optimally preheat the discharge lamp in either the preheating state or the 0 lighting state.

Hereinafter, the present invention will be explained in detail according to examples. FIG. 3 is a circuit diagram showing an embodiment of the present invention,
FIG. 4 is an explanatory diagram of the operation of the present invention. In the IIs diagram, when explaining the configuration, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted, and the parts different from FIG. 1 will be mainly described. As is clear from comparing FIG. 3 and FIG. 1, the choke coil (II
), capacitor (remove IQ and add a new output transformer (
6) is configured with a leakage transformer, and the secondary winding (6B)
A filament winding (6N') 1 is provided on the output side of the leakage transformer, and a capacitor (IG) is connected in parallel with the collector winding (6C) of the output transformer (6).

Next, detailed operation will be explained. First, when AC power is supplied, the inverter (3
) is supplied with a voltage as shown in FIG. 4(a) through a full-wave rectifier (2) ft. Further, a predetermined voltage is also generated in the transformer (13) of the control device (4).

Full-wave rectified pulsating DC voltage is supplied from the full-wave rectifier tJ4. The resistor (to) and the capacitor ae,) operate similarly to the well-known phase-controlled pulse generator, and the trigger element fin operates in a manner similar to that of a well-known phase-controlled pulse generator. A trigonal pulse is generated with the phase shown in 01.For this reason.

The switch element (consisting of a thyristor here) conducts at phase θ1 and has a resistance (9 μm).

Transistor (8M) through (9B), (8B)
Continue to supply base current to phase 00. Therefore, the inverter operates on the same principle as the conventional device shown in Fig. 1, and each winding of the output transformer (6) is
Various high frequency voltages shown in b) are generated.

At this time, the electrode (5mm) of the discharge lamp (5), the filament winding (
6F) output voltage. However, the voltage applied from the secondary winding (6th) to both ends of the discharge lamp is insufficient to start discharging the discharge lamp (5), so the discharge lamp (5) does not light up.

When a predetermined period of time has elapsed after the preheating of the electrodes (5M) and (5B) has started, resistance is applied to the capacitor (2) of the timer device of the control device (4), similar to the conventional device shown in FIG. The voltage charged through @ exceeds the Zener voltage of Zener diode 4.

For this reason, since a continuous trigger signal is received via the thyristor (IIJ is a diode), the AC power supply (1) is conductive for almost the entire period, and the transistors (8 µm) of the inverter (3), ( 8B) also operates in accordance with this, so each winding of the output transformer (6) has a
The voltage shown in is generated. At this time.

The electrode (5M) e (5B) of the discharge lamp (5) has already been heated, and the discharge lamp 111 is lit. When the discharge lamp a. is lit, a current as shown in FIG. 4) flows through the discharge lamp a.KFi. At this time, there is a period T1 from the 9th phase θ0 to 02, during which the discharge lamp does not flow.

This corresponds to the period until the voltage of the secondary winding (6S) of the output transformer (6) reaches a voltage sufficient to reignite the discharge lamp (5). At this time, a voltage as shown in FIG. 4 (e) is generated in the secondary winding (6B) KIIi of the output transformer (6). In other words, due to the action of the leakage transformer, during the period T1 when no current flows through the discharge lamp (5), the voltage becomes high due to the unloaded voltage, but when current flows through the discharge lamp (5), the voltage becomes high. During the T2 period, the terminal voltage of the discharge lamp (5) is lower than that in the no-load state, and the effective value is also lower.
) is also provided at the output of the output transformer (6), so its voltage is similar to the voltage generated in the secondary winding (6S), and the filament winding (, f
By setting the preheating start phase 01 and the number of turns of the filament winding (6F) shown in Figure 4 (b), the preheating voltage can be made optimal for both starting and lighting. be able to.

In the embodiment shown in FIG. 3, the period during which a high frequency alternating current voltage is generated in the output transformer (6) of the inverter (3) is set to be around the phase θ1 to 00 shown in FIG. 3 (0). However, it is also possible to set this to a period when the instantaneous value of the voltage of the AC power supply (1) is low, such as from 1 phase θ1 to 02, for example.
This embodiment is shown in FIG.

In Fig. 5, when the AC power supply (1) is applied to the transformer a1 of the control device (4), the transistor (to) is in the off state during a period when the instantaneous value of the voltage of the AC power supply (1) is low. The switch element (consisting of a transistor here) is made conductive and the resistance (9A) of the inverter (3)
) * Supply current to (9B).

In this case as well, the timer device (2) causes the transistor AST to become conductive continuously after a predetermined period of time has elapsed.

Similarly, the discharge lamp (5) is lit by continuously operating the inverter (3).

In the above explanation, the linear voltage supplied to the inverter (3) is a full-wave rectification of pulsating current.

Even when a one-phase controlled AC voltage is supplied using the dimmer cape, the voltage is full-wave rectified by the full-wave rectifier (2),
Considering the situation shown in Figure 6←).

It is clear that the device of the invention is applicable.

Furthermore, if the DC voltage supplied to the inverter (3) is smoothed by connecting a capacitor to the output terminal of the full-wave rectifier (2) as shown in FIG. A similar effect was obtained by setting an appropriate period T and output generation period T1i of the inverter (3) as in (b). in this case.

An oscillation circuit for generating an appropriate period T and a monostable multivibrator* for setting an appropriate period T1 may be used in the control device (4).

In an embodiment of the invention, the electrode (5) of the discharge lamp (5).

(5B) was preheated using a filament winding Ml (6m+') installed on the output side of the output transformer (6) consisting of a leakage transformer. It goes without saying that it is possible to connect an impedance of 5mm, 5mm, 5B, etc., but in a device like the one shown in Figure 3, which is equipped with a resonant circuit and performs self-oscillation, it is better to use a capacitor as the impedance. It was easy to set the appropriate preheating voltage.

In addition, as shown in Figure 5 (b), inverter (3)
When a smoothed DC voltage is supplied to the discharge lamp (5), it is recommended to set the voltage applied to both ends of the discharge lamp (5) near the limit value so that discharge starts when the electrodes are preheated. ,
The discharge lamp starts lighting when the electrodes are preheated by continuing the operation as shown in FIG. 5(b) at the time of starting.

In such a case, the control device (4) is a timer device (7).
Not.

It is also possible to perform a similar operation by detecting the current of the discharge lamp (5).

In the above description, the case where there is one discharge lamp is shown, but it goes without saying that the invention can be similarly applied to the case where there are two or more lamps.

As described above, according to the device of the present invention, it is possible to avoid a cold start when starting a discharge lamp, and furthermore, it is possible to set the preheating voltage of the electrodes to an optimal value both at the time of starting and at the time of lighting, thereby suppressing the deterioration of the electrodes. The advantage is that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of a conventional device, FIG. 2 is an explanatory diagram of its operation, FIG. 3 is a circuit diagram showing the configuration of an embodiment of the device according to the present invention, and FIG. FIG. 5 is a diagram showing the structure of another embodiment of the present invention, and FIG. 6 is an explanatory diagram of the operation of the device shown in FIG. In the figure, (1) is an AC power supply, (2) is a full-wave rectifier, (3) is a ti inverter, (4) is a control device, (5) is a discharge lamp, (5A) I (5B) is an electrode, ( 6) is an exit cadence. (6F) is a filament winding. The same reference numerals in Figure 9 indicate the same or corresponding parts.O Agent: Makoto Kuzuno - Procedural amendment (spontaneous) Showa 5 "N April 14th 1, 1987-01918" Patent application 1987-019181
No.::, Sl Ming's name Discharge lamp lighting device: 3 Supplementary + E h Representative Hitoshi Katayama Part 5, Target mountain of extraction FJ8 Prayer oath's detailed explanation of the invention 6, Supplementary contents + ll On page 4, lines 10 to 11 of the specification, it says ``circuit. In lines 16 and 17 of Sada, “-!i: & luxury f
I device + 2)" has been corrected to "Zenwave Hime fi device (2)." (3) In the second line of page 8 of the same size, the text "Timer circuit (2)" is corrected to "Timer device ■."that's all

Claims (8)

[Claims] (1) An inverter that converts power supplied from a DC power source into high-frequency AC power, a discharge lamp having a preheating electrode that is heated and lit by the output of the inverter, and when starting the discharge lamp, the output of the inverter, for a period longer than the high frequency AC voltage generated by the inverter. and a control device that repeatedly stops the discharge lamp and preheats the electrodes before starting lighting of the discharge lamp, wherein the output means of the inverter is a cage transformer, and a filament winding that preheats the electrodes of the discharge lamp. A discharge lamp lighting device characterized in that a line is provided on the output side of the leakage transformer. (2) The discharge lamp lighting device according to claim 1, wherein the DC power source is a pulsating DC power obtained by full-wave rectification of a commercial AC power source. (3) The discharge lamp lighting device according to claim 1, wherein the DC power source is a pulsating DC current obtained by full-wave rectification of a voltage obtained by controlling the phase of the voltage of a commercial AC power source. (4) The discharge lamp lighting device according to claim 2 or 3, characterized in that the period during which the output of the inverter is stopped is provided during a period in which the voltage value of the pulsating DC voltage is equal to or higher than a predetermined value. . (5) The discharge lamp lighting device according to any one of claims 1 to 4, characterized in that a period during which the output of the inverter is stopped is provided for each half cycle of the commercial AC power supply. (6) The period for stopping the output of the inverter is provided before a -predetermined phase of each half cycle of the commercial AC power supply, according to any one of claims 2 to 5. Discharge lamp lighting device. (7) Any one of claims 1 to 6, characterized in that the period during which the output of the inverter is stopped is reduced after a predetermined time has elapsed after the supply of power from the DC power supply or after lighting of the discharge lamp. The discharge lamp lighting device described in . (8) The discharge lamp lighting device according to any one of claims 1 to 7, characterized in that a capacitor is connected in series to the filament winding.