JPS61296685A - Discharge lamp starter - Google Patents

Abstract

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

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, discharge lamps such as fluorescent lamps are started using a glow lamp tube. As shown in Fig. 14, 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 σ lamp tube 5 is connected in parallel to the discharge lamp 4. When a power supply voltage is applied to the lighting tube 15, a glow discharge occurs between the internal contacts, and the contacts open due to the heat, and at that time, a high voltage generated by the stabilizing element 3 is applied to the discharge lamp 4. However, in this conventional method, the starting time of the lighting tube 15 is long and the operation is unstable, and the lighting tube 15 needs to be replaced depending on the type of discharge lamp 4. There was a drawback.

Also, recently a discharge lamp lighting device has been developed that uses an electronic circuit instead of a lighting tube to ensure stable starting. I+#
, 1cIFI, a switch element 25 such as a trunk switch or a nonlinear capacitor, and this switch element 25
A control circuit 26 for turning off the switch element 25 is provided, and a high voltage pulse is generated by the transient phenomenon of the stabilizing element 3 at the moment when the switch element 25 is turned off to start the discharge lamp 4. However, it also depends on the type of discharge lamp ( Since the voltage across the discharge lamp differs depending on the type of lamp (for example, 20W, 30W, etc.), it was necessary to prepare a different starting device for each type of discharge lamp.

In this way, in conventional discharge lamp lighting devices, the conduction phase, conduction time, and
Because the cutoff phase settings are different, if the installation is incorrect, the preheating time, preheating current value, pulse voltage value, etc. will be less than the specified value, causing startup failure, or conversely, if it is too high, the lamp will turn black. For example, in a 20W single-coil lighting circuit, the discharge lamp secondary short-circuit half-wave current value is 2.7A, and the 3OW
Since the current for the Chitsuk type is 4.5A, connecting a 20W starter to the starter socket of a 30W device may cause abnormal heat generation or destruction of the starter's internal resistance, semiconductor elements, etc. The equipment is easily damaged due to differences in installation, and since the equipment cannot be shared, parts management is complicated, which also causes high costs.

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

[Disclosure of the Invention] Accordingly, the discharge lamp starting device of the present invention includes a stabilizing element connected in series to the discharge lamp, a switch element connected between both ends of the secondary side of the discharge lamp to turn on/off the filament preheating current, and a switch element. and a control circuit that determines the type of discharge lamp connected based on the current detection level of the preheating current detection circuit and changes the cutoff phase of the switch element. By utilizing the fact that the preheating current of discharge lamps differs depending on the type of discharge lamp, the type of discharge lamp is determined based on the preheating current level when the power is turned on, and a high voltage pulse with a voltage suitable for each discharge lamp is generated. As a result, the starting device can be used in common with various discharge lamps, and the lamp can be started stably without reducing the life of the discharge lamp.

[Embodiment] FIG. 1 shows an embodiment of the apparatus of the present invention. In the figure, a stabilizing element 3 and a discharge lamp 4 are connected in series to a power supply 1 via a power switch 2, and a switch element 5 is further connected to both ends of the secondary side of the discharge lamp 4 via a preheating current detection circuit 7. This switch element 5 is controlled by a control circuit 6. This switch element 5 is for example (b)
As shown in the figure, it is composed of a series circuit of a diode 51 and a transistor 52. Note that 9 is a capacitor for noise prevention.

Figure 2 shows the internal radius of the preheating current detection circuit 7 and the control circuit 6, so the radio wave detection resistor 71 is
1 and a DC amplifier 712;
Voltage detection circuit 72 that detects the voltage across the current detection section 71
and a latch circuit 7 that latches the output of the voltage detection circuit 72.
3 is enough! ! 1, and the control circuit 6 includes a signal discrimination circuit 61 that ranks and outputs the latch output of the preheating current detection circuit 7, and a timer that changes the cutoff phase of the switch element 5 based on the discrimination output of the signal discrimination circuit 61. Selection circuit 63
It is made up of.

The current detection unit 71 also detects the output of a current transformer 713 inserted in series with the switch element 5, as shown in FIG.
Rectified by Guiod Britno 714, capacitor 71
It can also be configured by charging to vJ
As shown in FIG. 4, the voltage detection section 71. The voltage detection circuit 72 can also be configured using seven automatic couplers 716 to 718.

As shown in FIG. 5, the voltage detection circuit 72 in FIG. fJS2 or FIG. Or as shown in Figure 6, SB
S elements Q,,Q2. The operating voltages of Q, respectively, are applied to voltage dividing resistors RazRb1.・Rai, Rb, set by the partial pressure ratio, or as shown on the first page, neon tubes N1°N2., instead of the SBS element. N, and seven Ototransistors P,, P2. A device using P3 can be used.

Further, as the signal discrimination circuit 61 of the control circuit 6, for example, p
It can be configured with a logic circuit as shown in FIG. 1S8 (a). FIG. 6B shows the relationship between the input and output of the signal discrimination circuit 61. For example, each input terminal e, f,
When the H signal level is H, L, L, only the output terminal i becomes H.

FIG. 9 shows a specific circuit example of the timer selection circuit 64 for changing the cutoff phase of the switch element 5. When any one of the input terminals h+i+J+ becomes H level, the relay coil L + , :.・When the - of I L4 is selected and its contact S++...1Ei4 is closed, four timers T are set to different times in sequence.
One of t t...I T 4 is selected.

The time limit of the timer T l l...t T 4 is as follows:
It is set according to the m class (20W, 30W, etc.) of the discharge lamp 4, and when a certain preheating time has passed, it starts operating in synchronization with the power supply waveform, and when the set time has passed, it is switched on via the drive circuit 7. Element 5 is opened to interrupt the preheating current. FIG. 10 shows the above operation, and according to the present invention, the cutoff phase T of the preheating current is changed to change the cutoff current value is, thereby changing the voltage vp of the high voltage pulse generated. It is something.

In the embodiment of FIG. 11, together with the preheating current detection circuit 7,
A discharge lamp voltage detection circuit 8 is provided to detect the voltage across the secondary side of the discharge lamp, and the voltage detection level output from the discharge lamp current detection circuit 8 and the voltage detection level output from the preheating current detection circuit 7 are determined in the control circuit 6. In combination with the current detection level, #9m of the connected discharge lamp is determined.

FIG. 12 shows a detailed block diagram of the starter section A in FIG. 11. Here, the voltage detection circuit 81 of the discharge lamp wi end voltage detection circuit 8 has the same configuration as the voltage detection circuit 72 shown in FIGS. The configuration of the signal discrimination circuit 61 shown in FIG. By detecting the combination of both levels by the circuit 65, it is possible to determine the type of appliance including the discharge lamp 3 and stabilizing element 2 to which the starter section A is connected as shown in the attached table on the next page.

FIG. 13 shows a specific circuit example of the matrix discrimination circuit 65, where the current level signals hr:rJ are each 2.7
A, 4.5A, 5.8A, voltage level signal h'
+! 'yJ', ni' are 100■, 147■, 2 respectively
00■, 230■ are shown. Therefore, the combination of voltage and current is set to A for each type of ballast in the attached table.
By extracting with ND date, the signals corresponding to the six types of ballasts shown in the attached table are u, v, w, x,
It is output to each terminal of y and z.

In this embodiment, the peak value of the half-wave preheating current is shown as the preheating current value, but the full-wave preheating current may be used, or the effective value or the average value of the main preheating current may be used. Although only the current cutoff phase is controlled by the discharge lamp discrimination output, it is also possible to control not only the cutoff phase but also the preheating time, the conducting phase of the preheating current, the number of generated pulses, etc.

[[Effects of the Invention] As described above, the present invention includes means for determining the type of discharge lamp connected by detecting the preheating current value of the discharge lamp when the power is turned on; Since the device is equipped with means for changing the cut-off phase of the switch element, the device can be used in common for different types of discharge lamps, and moreover, by generating high voltage pulses suitable for each discharge lamp,
It has the advantage of being able to start stably without reducing the life of the discharge lamp.

[Brief explanation of the drawing]

FIG. 1(a) is an overall block diagram showing one embodiment of the device of the present invention, FIG. 1(b) is a specific circuit diagram of the main parts of the same as above, and FIG. 2 is a block diagram of the main parts of the same as above. 1S3 to 7 are specific circuit diagrams showing various circuit examples of the main parts of the above, Fig. 8 (a) is a specific circuit diagram of the main parts of the above, (b) is a diagram explaining its operation, and Fig. 9 is the same as the above. 10 is a waveform diagram showing the operation of the same as above, FIG. 11 is an overall block diagram showing another embodiment of the device of the present invention, FIG. 12 is a block diagram of the main part of same as above, and FIG. The figure is a specific circuit diagram of the main part same as above, and FIGS. 14 and 15 are block diagrams of the 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, 61 is a signal discrimination circuit, 62 is a timer selection circuit, 63 is an output circuit, 64 is a signal discrimination circuit, 65 is a matrix circuit, 7 is a preheating current detection circuit, 71 is a current detection section, 72 is a voltage detection circuit, 73
8 is a latch circuit, 8 is a discharge lamp secondary voltage detection circuit, 81 is a voltage detection circuit, and 82 is a latch circuit. Agent Patent Attorney Ishi 1) Ai 7d) Haru-17 LL χ Figure 9 1110 Figure 11

Claims (2)

[Claims] (1) A stabilizing element connected in series to the discharge lamp, and two of the discharge lamps.
A switch element is connected between both ends of the next side to turn on and off the filament preheating current, a preheating current detection circuit is connected in series with the switch element, and the type of discharge lamp connected is determined by the current detection level of the preheating current detection circuit. A discharge lamp starting device comprising: a control circuit that discriminates and changes the cutoff phase of a switch element. (2) A discharge lamp voltage detection circuit that detects the voltage across the secondary side of the discharge lamp is provided, and the voltage detection circuit is connected in the control circuit by a combination of the voltage detection level of the discharge lamp current detection circuit and the current detection level. 2. The discharge lamp starting device according to claim 1, wherein the discharge lamp starting device is configured to determine the type of discharge lamp that is being used.