WO2007020776A1

WO2007020776A1 - High-pressure discharge lamp operating device

Info

Publication number: WO2007020776A1
Application number: PCT/JP2006/314686
Authority: WO
Inventors: Tsutomu Takatsuki
Original assignee: Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
Priority date: 2005-08-17
Filing date: 2006-07-25
Publication date: 2007-02-22
Also published as: WO2007020776A9; AU2006280899A1; AU2006280899B2; EP1916882B1; CN101243729B; CN101243729A; EP1916882A1; KR101226179B1; KR20080036150A; JP2007052977A; EP1916882A4; JP4759105B2

Abstract

A high-pressure discharge lamp operating device is capable of maintaining a start pulse voltage within a specific value by feeding back the start pulse voltage and making it constant even when the output capacity increases because of an output wiring length increase. A high-pressure discharge lamp operating device comprising a high pressure discharge lamp (8), a start pulse generating circuit (7) for supplying a starting high voltage to the high-pressure discharge lamp (8), and a control circuit (9) for controlling the start pulse generating circuit (7) is characterized in that the start pulse generating circuit (7) comprises a transformer (T1) for stepping up the pulse voltage generated by turning on/off a FET, a feedback voltage detecting winding (N3) provided in the transformer (T1), a voltage dividing circuit (11) for dividing the voltage generated in the feedback voltage detecting winding (N3), and a pulse detecting circuit (12) for detecting a start pulse voltage component from the output of the voltage dividing circuit (11) and feeding back the start pulse voltage component to the control circuit (9), and that the control circuit (9) maintains the voltage stepped up by the transformer (T1) at a predetermined value.

Description

Specification

High pressure discharge lamp lighting device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a high pressure discharge lamp lighting device, and more particularly to a high pressure discharge lamp lighting device including a start pulse generating circuit capable of extending an output wiring length.

Background art

FIG. 7 is a block diagram showing a conventional high pressure discharge lamp lighting device. In the high pressure discharge lamp lighting device, when the commercial power source 1 is turned on, the control power source circuit 10 generates the control power source, the control circuit 9 operates, and the step-up inverter 3, the step-down inverter 4, the rectangular wave circuit 6, the start pulse A control signal is sent to generation circuit 7, and each starts operation. The step-up inverter 3 boosts the output rectified by the rectifier circuit 2 to a specified voltage, and the step-down inverter 4 adjusts the output so that the current flowing through the high-pressure discharge lamp 8 becomes a specified current. The rectangular wave circuit 6 outputs an AC rectangular wave voltage having a specified frequency to the high-pressure discharge lamp 8. The start pulse generation circuit 7 generates a high pressure pulse to start the high pressure discharge lamp 8.

FIG. 8 is a detailed diagram of the start pulse generation circuit 7. The start pulse generation circuit 7 operates only when the high pressure discharge lamp 8 is started, and generates a high pressure pulse. The start pulse generation circuit 7 is a direct current boosted by the boost inverter 3 by rectifying the AC voltage of the transformer T1, the FET (field effect transistor) that can be turned on and off by an external control signal, and the commercial power supply 1 It has a capacitor Cl charged with voltage Vcc, an inductance L1 that protects the FET from overcurrent, and a capacitor C2 that blocks high voltage pulses generated by the transformer T1 from entering the rectangular wave circuit 6.

Patent Document 1: Japanese Patent Laid-Open No. 11-307285

Patent Document 2: Japanese Patent Laid-Open No. 2000-306688

Patent Document 3: Japanese Patent Laid-Open No. 2002-75673

Disclosure of the invention

Problems to be solved by the invention

[0004] For example, a high-pressure discharge lamp such as a high-intensity high-pressure discharge lamp has a starting pulse voltage of 3 to 5 kVp. It is prescribed. In the high-pressure discharge lamp lighting device, if the output wiring length becomes longer, the starting pulse voltage attenuates due to the increase in output capacity.

For example, if the output wiring length is 10m, there will be a problem that the lamp cannot be started. Therefore, the output wiring length of the high-pressure discharge lamp lighting device has a regulation of 2 m or less, which is a construction restriction (see Fig. 9). A high-pressure discharge lamp lighting device that outputs a starting pulse voltage of 4 kVp at an output wiring length of 10 m may be used. However, if this high-pressure discharge lamp lighting device is used at 2 m or less, the starting pulse voltage will be 5.6 kVp or more. There is a risk of leakage in wiring, sockets, high-pressure discharge lamps, etc.

[0005] The present invention has been made to solve the above-described problems. Even if the output wiring length is increased and the output capacity is increased by feeding back the starting pulse voltage and keeping it constant. An object of the present invention is to provide a high pressure discharge lamp lighting device capable of maintaining the starting pulse voltage within a specified value.

Means for solving the problem

[0006] A high pressure discharge lamp lighting device according to the present invention includes a high pressure discharge lamp, a start pulse generating circuit for supplying a high voltage for starting to the high pressure discharge lamp, and a control circuit for controlling the start pulse generating circuit. In the high pressure discharge lamp lighting device,

The starting pulse generating circuit is

A transformer that boosts the pulse voltage generated by turning on and off the switching element, a feedback voltage detection cable provided in the transformer,

A voltage dividing circuit that divides a voltage generated in the feedback voltage detection winding; and a pulse detection circuit that detects a starting pulse voltage component from an output of the voltage dividing circuit and feeds back to the control circuit, and Is characterized in that the voltage after boosting the transformer is maintained at a predetermined value.

The invention's effect

[0007] With the above configuration, the high pressure discharge lamp lighting device according to the present invention can maintain the starting pulse voltage within a specified value even when the output wiring length increases and the output capacity increases.

Brief Description of Drawings

FIG. 1 is a diagram illustrating the first embodiment, and shows the output power of the start pulse generation circuit when the output wiring length is changed. It is a pressure measurement figure.

FIG. 2 shows the first embodiment, and shows the measurement result of the starting pulse voltage when the wiring length is changed.

FIG. 3 shows the first embodiment, and shows the measurement result of the starting pulse voltage when the wiring length is changed.

FIG. 4 shows the first embodiment, and shows the measurement results of the FET voltage V (C) and the starting pulse voltage V (B) when the wiring length is changed.

FIG. 5 shows the first embodiment, and shows the measurement results of the FET voltage V (C) and the starting pulse voltage V (B) when the wiring length is changed.

FIG. 6 shows the first embodiment, and is a detailed diagram of a start pulse generating circuit.

FIG. 7 is a block diagram showing a conventional high pressure discharge lamp lighting device.

FIG. 8 is a detailed view of a conventional starting pulse generation circuit 7.

FIG. 9 is a diagram showing the relationship between the output wiring length and the starting pulse voltage of a conventional high pressure discharge lamp lighting device.

Explanation of symbols

[0009] 1 commercial power supply, 2 rectifier circuit, 3 step-up inverter, 4 step-down inverter, 5 current detection resistor, 6 rectangular wave circuit, 7 start pulse generation circuit, 8 high pressure discharge lamp, 9 control circuit, 10 control power supply circuit, 11 Voltage divider, 12 pulse detector

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] Embodiment 1.

Figs. 1 to 6 are diagrams showing the first embodiment, Fig. 1 is an output voltage measurement diagram of the start pulse generation circuit 7 when the output wiring length is changed, and Figs. 2 and 3 are start pulse voltages when the wiring length is changed. Figures 4 and 5 show the measurement results of FET (field effect transistor) voltage V (C) and starting pulse voltage V (B) when the wiring length is changed, and Figure 6 shows the measurement results. 3 is a detailed view of a start pulse generation circuit 7. FIG.

[0011] The overall configuration of the high pressure discharge lamp lighting device is the same as that of the conventional one, and the start pulse generating circuit 7 is characterized by this embodiment.

[0012] As described in the background art, when the output wiring length is increased, the starting pulse voltage value is decreased and increased. If the starting voltage of the pressure discharge lamp is lowered, the high pressure discharge lamp may not start and a malfunction may occur. Generally, in the high pressure discharge lamp lighting device, the output wiring length is specified to 2 m or less. High pressure discharge lamps start at 3.5kVp, and do not start at OkVp.

[0013] Even if the output wiring length is long, a starting method is proposed in which a starting voltage value is ensured by feeding back the starting nors voltage so that a lamp starting failure does not occur.

[0014] For that purpose, the following two points must be established. That is,

(1) The output voltage from the starting pulse generator 7 at points A and B in Fig. 1 should be approximately equal. For example, if the voltage at point A is 5 kVp and the voltage at point B is 3 kVp, the output voltage of the start pulse generator circuit (almost the voltage at point A) cannot be fed back.

(2) When controlling the starting pulse voltage, the starting pulse voltage is as high as 3 to 5 kVp, and it is necessary to use many high-voltage components, resulting in an increase in size. Even if high-voltage components are mounted, there is a loss during normal lighting. The voltage to be fed back is about lOVp.

. In the start pulse generator circuit 7 shown in Fig. 8, the force using the transformer T1 F ET voltage V (C) before boosting and the start pulse voltage V (B) which is the voltage at the point B ahead of the output wiring length If there is a correlation, control of the low voltage FET voltage V (C) makes it possible to control the voltage at point B ahead of the output wiring length.

[0015] Therefore, first, the starting pulse voltage V (A) and the starting pulse voltage V (B) at points A and B in FIG. 1 in the above item (1) were measured while changing the output wiring length. The wiring used in the experiment is a WF cable. Yanagi's results are shown in Figs. Output self-service line length 0, 0. 5, 1, 2, 4, 6, 8, 10m [In this case, the starting pulse voltage V (A) and starting pulse voltage V (B) at points A and B were measured. . As shown in Figs. 2 and 3, it was confirmed that the starting pulse voltage V (A) and starting pulse voltage V (B) at points A and B were almost equal regardless of the output wiring length. Therefore, for example, if the starting pulse voltage V (A) is controlled to 4 kVp, the starting pulse voltage V (B) can be controlled to almost 4 kVp.

Next, in order to confirm the above item (2), the output wiring length is changed, and the FET voltage V (C) and the starting pulse voltage V (A) before boosting the transformer T1 are measured. The results are shown in Figs.

[0017] As shown in Figs. 4 and 5, the FET voltage V (C) and the start pulse voltage V (A) have a correlation, and by controlling the low voltage FET voltage V (C), start Pulse voltage V (A) can be controlled. I understood that. The FET voltage V (C) is 1Z 10 or less of the starting pulse voltage V (A). If the voltage is 1Z10 or less of the starting pulse voltage V (A), it can be created with a small circuit. The FET voltage V (C) is larger than the desired lOVp for feedback, but if it is about 300 Vp, a feedback circuit can be configured with a few circuit components.

With reference to FIG. 6, the starting norse generation circuit 7 of the present embodiment will be described. Add feedback voltage detection wire N3 to transformer T1. Specifically, for example, assuming that primary winding N1 is 6 turns, secondary winding N2 is 88 turns, and feedback voltage detection winding N3 is 1 turn, FET voltage V (C) = 300Vp, start pulse The voltage V (A) = 4.4 kVp and the feedback voltage V (F) = 50 Vp.

[0019] The voltage divider circuit 11 is connected to the feedback voltage detection wire N3. The voltage dividing circuit 11 is constituted by a resistor, for example, and divides it into an arbitrary voltage. The feedback voltage can also be lowered to about the preferred lOVp.

[0020] The voltage divider circuit 11 is connected to the pulse detector circuit 12. The output of the voltage dividing circuit 11 includes various voltage components in addition to the necessary starting pulse voltage component. Of these, the pulse detection circuit 12 detects the starting pulse voltage component.

Then, the output of the pulse detection circuit 12 is fed back to the control circuit 9. The control circuit 9 controls the FET voltage V (C) so that the starting pulse voltage V (A) is constant, for example, 4 kVp.

As described above, according to the present embodiment, the low voltage (eg, 50 Vp) of the feedback voltage winding N 3 provided in the transformer T1 is further divided and reduced by the voltage divider circuit 11 to Since the required start pulse voltage component is detected by the pulse detection circuit 12 and fed back to the control circuit 9, the start pulse voltage V (A) can be maintained at 4 kVp, for example. Up to about 10 m of output wiring length, it has been confirmed that the starting pulse voltage is almost the same regardless of the output wiring length, so if the starting pulse voltage V (A) is maintained at 4 kVp, the output wiring length The starting pulse voltage 10m ahead can be maintained at almost the same voltage value.

Claims

The scope of the claims

In a high pressure discharge lamp lighting device comprising a high pressure discharge lamp, a start pulse generating circuit for supplying a high voltage for starting to the high pressure discharge lamp, and a control circuit for controlling the start pulse generating circuit,

The starting pulse generating circuit is

A voltage dividing circuit that divides a voltage generated in the feedback voltage detection winding; and a pulse detection circuit that detects a starting pulse voltage component from an output of the voltage dividing circuit and feeds back to the control circuit, and Is a high-pressure discharge lamp lighting device characterized in that the voltage after boosting the transformer is maintained at a predetermined value.