JPH06101386B2 - Discharge lamp starter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a discharge lamp starting device for starting a discharge lamp such as a fluorescent lamp.

BACKGROUND ART Conventionally, a discharge lamp such as a fluorescent lamp has been started by a glow ignition tube. As shown in FIG. 9, this is one in which a stabilizing element 3 and a discharge lamp 4 are connected in series to a power source 1 via a power switch 2, and further a lighting tube 5 is connected in parallel to the discharge lamp 4. When the power supply voltage is applied to the lamp tube 15, glow discharge occurs between the internal contacts, and the heat causes the contacts to open, and at that time, the high voltage generated by the stabilizing element 3 is applied to the discharge lamp 4. The discharge lamp 4 is lighted by using this method, but in this conventional method, the starting time of the lighting tube 15 is long and the operation is unstable, and it is necessary to replace the lighting tube 15 depending on the type of the discharge lamp 4. There was a flaw.

Recently, a discharge lamp lighting device has been developed which uses an electronic circuit instead of a lighting tube to perform stable starting. This is the tenth
As shown in the figure, a switching element 25 such as a transistor or a non-linear capacitor and a control circuit 26 for turning off the switching element 25 are provided, and a high voltage pulse is generated by a transient phenomenon of the stable element 3 at the moment when the switching element 25 is turned off. The discharge lamp 4 is started by doing so, but since the voltage across the discharge lamp differs depending on the type of discharge lamp (for example, 30W, 32W, 40W, etc.), it is necessary to prepare different starting devices for each. there were.

Thus, in the conventional discharge lamp lighting device, the conduction phase of the lighting tube and the switch element, the conduction time, for each type of discharge lamp,
If the installation is incorrect, the preheating time, preheating current value, pulse voltage value, etc. will be less than the specified values, and the startup failure will occur due to different cutoff phase settings. If you connect a 30W starter to the starter socket of a 40W appliance, for example, the no-load secondary voltage is 100V in the 30W choke coil type lighting circuit and 200V in the 40W choke type. However, there is a problem that about twice the voltage will be applied, causing abnormal heat generation or destruction of the internal resistance of the starter, semiconductor elements, etc., and it is easy to damage the device due to incorrect installation of the lighting tube or starter. Since the device cannot be shared, parts management and the like are complicated, which also causes a high cost.

[Object of the Invention] The present invention has been made in view of the above problems, and an object thereof is to provide a starting device that can be commonly used for different types of discharge lamps.

DISCLOSURE OF THE INVENTION The present invention thus includes a stabilizing element connected in series with a discharge lamp, a switch element connected in parallel with the discharge lamp to turn on / off a filament preheating current, and a control circuit for controlling the switch element. In the discharge lamp starter, the control circuit includes means for detecting the voltage across the discharge lamp when the power is turned on to determine the type of the discharge lamp, and means for changing the cutoff phase of the switch element according to the determination output. It is characterized by the fact that it is equipped, and the type of discharge lamp is determined by the voltage across the discharge lamp when the power is turned on, utilizing the fact that the no-load secondary voltage of the discharge lamp differs depending on the type of discharge lamp. However, by generating a high voltage pulse suitable for each discharge lamp, the discharge lamp can be stably started without shortening its life.

FIG. 1 shows an embodiment of the device of the present invention. In the figure, a stabilizing element 3 and a discharge lamp 4 are connected in series to a power source 1 via a power switch 2, and a switch element 5 is connected in parallel to both ends of the discharge lamp 4 on the secondary side. Are controlled by the control circuit 6 via the drive circuit 7. The switch element 5 is composed of a series circuit of a diode 51 and a transistor 52, as shown in FIG.

FIG. 2 shows the internal configuration of the control circuit 6. The means A for determining the type of the connected discharge lamp 4 is a voltage detection circuit 61 for detecting the secondary side voltage of the discharge lamp and a voltage detection circuit 61. A latch circuit 62 for latching the output of the switch and a signal discriminating circuit 63 for ranking and outputting the latched voltage level, and a timer selection circuit 64 is provided as a means B for changing the cutoff phase of the switch element 5. It's been done.

As the voltage detection circuit 61, as shown in FIG. 3, a voltage detection circuit for detecting the potential at the voltage dividing point of the voltage dividing resistors Ra and Rb by the constant voltage diodes ZD ₁ , ZD ₂ and ZD ₃ or shown in FIG. As described above, the operating voltages of the SBS elements Q ₁ , Q ₂ , and Q ₃ are set by the voltage dividing ratios of the voltage dividing resistors Ra ₁ , Rb ₁ , ..., Ra ₃ , Rb ₃ , respectively, or as shown in FIG. Further, it is possible to use a neon tube N ₁ , N ₂ , N ₃ and phototransistors P ₁ , P ₂ , P ₃ instead of the SBS element. Further, the signal discriminating circuit 63 can be constituted by a logic circuit as shown in FIG. 6 (a), for example. FIG. 7B shows the relationship between the input and output of the signal discriminating circuit 63. For example, when the signal levels at the input terminals c, d, and e are H, L, and L, only the output terminal g is shown. Becomes H.

FIG. 7 shows a concrete circuit example of the timer selection circuit 64 as means for changing the cutoff phase of the switch element 5.
When any one of the input terminals f, g, h, i becomes H level,
One of the relay coils L ₁ , ..., L ₄ is selected and its contact
s _1, ..., the closure of s _4, 4 pieces of timer T ₁ that is set are sequentially different times, ..., one T ₄ is selected.

The time limit of the timers T ₁ , ..., T ₄ is set according to the type of discharge lamp 4 (30W, 32W, 40W, etc.), and operates in synchronization with the power supply waveform after a certain preheating time. After the start, when the set time has elapsed, the switch element 5 is opened via the drive circuit 7 to cut off the preheating current. FIG. 8 shows the above operation. According to the present invention, the cutoff phase T of the preheating current is changed to change the cutoff current value is, and the voltage vp of the high voltage pulse generated thereby is changed. It is a thing.

In this embodiment, only the current cutoff phase is controlled by the discharge lamp discrimination output, but not only the cutoff phase but the thermal time,
It is also possible to control the conduction phase of the preheating current, the number of generated pulses, and the like.

[Advantages of the Invention] As described above, in the present invention, means for determining the type of the discharge lamp connected by detecting the voltage across the discharge lamp when the power is turned on, and the switch element according to the determination output. Since it is provided with a means for changing the cutoff phase of the discharge lamp, the device can be shared by different types of discharge lamps, and by generating high-voltage pulses suitable for each discharge lamp, it is possible to stabilize the discharge lamp without shortening its life. It has the advantage that it can be started.

[Brief description of drawings]

FIG. 1 (a) is an overall block diagram showing an embodiment of the device of the present invention, FIG. 1 (b) is a detailed circuit diagram of essential parts of the same, FIG. 2 is a block diagram of essential parts of the same, and FIGS. Is a specific circuit diagram showing various circuit examples of the main part of the above, FIGS. 6 and 7 are specific circuit diagrams of the main part of the same, FIG. 8 is a waveform diagram showing the operation of the same, FIG. 9 and FIG. The figure is a block diagram of a conventional example. 1 is a power supply, 2 is a power switch, 3 is a stabilizing element, 4 is a discharge lamp, 5 is a switch element, 6 is a control circuit, 7 is a drive circuit,
61 is a voltage detection circuit, 62 is a latch circuit, 63 is a signal discrimination circuit, 64 is a timer selection circuit, A is a means for discriminating the type of discharge lamp, and B is a means for changing the cutoff phase of the switch element.

Claims (1)

[Claims] 1. A discharge lamp starting device comprising a stabilizing element connected in series to a discharge lamp, a switch element connected in parallel to the discharge lamp to turn on / off a filament preheating current, and a control circuit for controlling the switch element, A means for detecting the voltage across the discharge lamp when the power is turned on to determine the type of discharge lamp,
A discharge lamp starting device, characterized in that the control circuit is provided with means for changing a cut-off phase of a switch element according to the discrimination output.