JPH03102799A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To widen the service range of a power supply and embody the lighting device concerned in simple and small construction by connecting a series circuitry of ballast capacitor and full wave rectifier to the secondary side of an oscillator transformer, which is a constituent of a high frequency inverter circuit, and connecting a small-sized light emission lamp with this full wave rectifier. CONSTITUTION:A high frequency inverter circuit is furnished on the primary side of a transformer 6, and the high frequency voltage generated by this high frequency inverter is boosted or sunk by this transformer 6 to an appropriate voltage. To the secondary side of this transformer 6 a point between one side of the cathode 9b of a small-sized light emission lamp 9 and its anode 9a is connected through a ballast capacitor 7 and a full wave rectifier 8, and the heater for said cathode 9b is used unheated. This provides a wide service range of supply voltage, less power loss at the ballast because of using ballast capacitor 7 at high frequency, small configuration incl. transformer 6. Further because the heater for cathode 9b remains unheated, the input pin of the lamp 9 manages with two terminals, which together with unnecessity for any preheating circuit should simplify both the lamp 9 and the circuit.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a lighting circuit for a small light emitting lamp.

[Conventional technology]

The conventional device was as described in Japanese Unexamined Patent Publication No. 58-42158. In other words, commercial exchange 1! The source is input to the primary side of the transformer, and of the two secondary outputs, one is connected between the terminals of the cathode equipped with a heater of a small luminescent lamp to heat the cathode, and the other is a full-wave rectifier. It was connected between the anode and cathode of a small light-emitting lamp via a ballast resistor to supply a discharge current. [Problems to be Solved by the Invention] In the above-mentioned conventional technology, since a voltage is applied between the #i electrode and the anode while heating the cathode, the discharge starting voltage is relatively low, so the winding of the secondary winding is Although it can be made smaller, the transformer is complicated due to the preheating winding, and the frequency is low in the case of commercial power supply, making it larger. Furthermore, although the above-mentioned prior art describes the case where a DC power source is used, it cannot be used when the single source voltage is low because it does not have a step-up means.

Furthermore, since it was a resistive ballast, it generated a lot of heat, and the small light-emitting lamp had three pins, making the shape of the lamp itself *m. An object of the present invention is to provide a small device with a simple structure and which can be applied to both AC and DC power sources over a wide voltage range.

[Means to solve the problem]

In order to achieve the above purpose, a high frequency inverter circuit is installed on the primary side of the transformer, the crystal frequency voltage generated by the high frequency inverter is boosted or stepped down to an appropriate voltage by the transformer, and a ballast capacitor is installed on the secondary side of the transformer. One of the cathodes of the small light-emitting lamp was connected to the anode through a full-wave rectifier, and the cathode heater of the small light-emitting lamp was used without heating. [Function] Since the crystal frequency voltage generated by the high frequency inverter is stepped up and down to the desired voltage using the transformer, the applicable range of the TT source voltage is wide.Since the ballast capacitor is used at high frequency, the power loss in the ballast is small and the power loss in the ballast is small, and the power loss in the ballast is small. Can be made smaller. In addition, since the cathode heater does not heat up, the small light-emitting lamp requires only two human-powered pins, and there is no need for a preheating lpj path, so both the lamp and the circuit can be simplified. Since the lamp used in the present invention has a short distance between the cathode and anode,
Even without preheating, the discharge starting voltage is not as poor as that of ordinary fluorescent lamps, so the damage to the electrodes during startup is not as great, and a lamp life that is sufficient for practical use can be ensured. [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In Fig. 1, 1 is a DC power supply, 2 is a choke, 3 is a base resistor, 4 and 5 are transistors, and 6 is a primary winding 6a.
, a transformer including a feedback winding 6b and a secondary winding 6c, 7
is a ballast capacitor, 8 is a full wave rectifier, 9 is an anode 9a
．． A small light emitting lamp equipped with a cathode 9b, IO is a resonant capacitor.

The primary side of the transformer 6 is generally called a constant current push-pull inverter, in which transistors 4 and 5 are alternately turned on and off.
By repeatedly turning off, resonance is generated between the primary side of the transformer 6 and the resonant capacitor 10, and the resonant voltage is extracted from the feedback winding lIA6b and used as a driving source for the transistors 4 and 5, thereby repeating oscillation. . The secondary winding 6C of the transformer 6 is connected to the AC input terminal of a full-wave rectifier 8 via a ballast capacitor 7, so that a voltage of an appropriate value is generated at the DC output terminal of the full-wave rectifier 8. Adjust the winding ratio of transformer 6. Therefore, when the DC power source 1 is manually applied to the constant current push-pull inverter described above, a voltage is applied between the anode 9a and the cathode 9b of the small light emitting lamp 9, and the lamp starts emitting light. After the discharge starts, a constant current is supplied to the small light emitting lamp 9 by the action of the ballast capacitor 7. Above, an embodiment has been described using a constant current push-pull circuit as an example of a high-frequency inverter on the primary side, but even a single-stone inverter, as in another embodiment of the present invention shown in FIG. 2, operates in the same way. In addition, when the vlL source is an AC #L source, it can be used as an AC power source by adding full-wave rectification and ) dome path to the human power. [Effects of the Invention] As explained above, according to the present invention, it is possible to realize a light lighting device using a small light-emitting lamp, which has a wide range of power source applications, is small, and is low cost. In addition, since a small light-emitting lamp can be used with two terminals, it is easy to handle, the socket structure can be simplified, and there is no need to incorporate a lighting auxiliary device such as a Cyduck inside the lamp, resulting in lower costs6.

[Brief explanation of drawings]

Claims (1)

[Claims] 1. A high-frequency inverter circuit that operates using a DC power source as a power supply source, and 1 of the components of the high-frequency inverter circuit.
A series circuit of a ballast capacitor and the AC input terminal of a full-wave rectifier is connected to the secondary side of an oscillation transformer, which is connected to the DC output terminal of the full-wave rectifier, and is arranged at a relatively short distance interval. A discharge lamp lighting device consisting of a cathode, an anode, and a small light-emitting lamp made of a glass tube or the like to form a discharge space.