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Discharge lamp lighting circuit

A lighting circuit and discharge lamp technology, which is applied in electric light sources, electrical components, lighting devices, etc., can solve problems such as breakdown, reduce power loss, and prevent self-extinguishing effects

Inactive Publication Date: 2014-02-26
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Power on
[0007] 2. Breakdown
[0009] 3. Arc Growth

Method used

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  • Discharge lamp lighting circuit
  • Discharge lamp lighting circuit

Examples

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Comparison scheme
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no. 1 Embodiment approach

[0050] figure 1 It is a circuit diagram showing the configuration of the vehicle lamp 2 according to the first embodiment. The vehicle lamp 2 includes a discharge lamp 4 that is a metal halide lamp, a discharge lamp lighting circuit 100 for driving the discharge lamp 4 , an on-vehicle battery (hereinafter, simply referred to as a battery) 6 , and a power switch 8 .

[0051] The battery 6 generates a DC voltage Vbat of 12V (or 24V). The power switch 8 is a relay switch provided to control ON and OFF of the discharge lamp 4 and is provided in series with the battery 6 .

[0052] The discharge lamp lighting circuit 100 boosts the smoothed battery voltage Vbat, performs AC conversion, and supplies it to the discharge lamp 4 . Next, the detailed configuration of the discharge lamp lighting circuit 100 will be described.

[0053] The discharge lamp lighting circuit 100 includes a first DC / DC converter CONV1, a second DC / DC converter CONV2, a lighting auxiliary circuit 10, a start...

no. 2 Embodiment approach

[0140] In the first embodiment, the technique of alternating-current lighting by operating two DC / DC converters provided at both ends of the discharge lamp 4 has been described. In the second embodiment, AC lighting is performed using a single DC / DC converter and switching circuit (H bridge circuit).

[0141] Figure 6 It is a circuit diagram showing the configuration of a vehicle lamp 2a according to the second embodiment. omit with figure 1 In the description of the common structure, only the differences are described.

[0142] The discharge lamp lighting circuit 100 a includes a DC / DC converter CONV4 , a lighting auxiliary circuit 10 , a starter circuit 20 , an H bridge circuit 40 , and an input circuit 42 .

[0143] The input circuit 42 includes an input inductor L6, input capacitors C1, C6, a resistor R6, and an input switch M6. The input capacitor C6 is provided in parallel with the battery 6 to smooth the battery voltage Vbat.

[0144] The input inductance coil L6 ...

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PUM

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Abstract

A discharge lamp lighting circuit facilitates carrying out re-ignition and addresses a problem than can arise due to an influence of a capacitor in an auxiliary lighting circuit. A driving voltage generating portion supplies an AC driving voltage to a discharge lamp to be a driving target. An auxiliary lighting circuit is provided on a terminal side of the discharge lamp. An auxiliary lighting capacitor, an auxiliary lighting resistor and a switch are provided in series between the terminal of the discharge lamp and a fixed voltage terminal. A control circuit controls a conducting state of the switch. The switch is brought into an ON state before the discharge lamp is turned ON, and is brought into an OFF state after the discharge lamp is turned ON.

Description

technical field [0001] The invention relates to a lighting circuit for a discharge lamp. Background technique [0002] In recent years, metal halide lamps (hereinafter referred to as discharge lamps) have been used as vehicle lamps (headlamps) instead of conventional halogen lamps having filaments. Discharge lamps can achieve higher luminous efficiency and longer life than halogen lamps, but on the contrary, since several tens to hundreds of V are required as a driving voltage, it cannot be directly driven by a 12V (or 24V) vehicle battery, and a discharge lamp lighting circuit is required. (also called ballast). [0003] There are two methods of lighting discharge lamps: DC drive and high-frequency drive. However, if DC drive is used, the arc of the discharge will be asymmetrical and the luminous curves will be inconsistent. Therefore, it is not suitable for use in vehicle lamps. Use AC drive in lamps. If the discharge lamp is AC-driven at a high frequency of 10 kHz or h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/282
CPCH05B41/2925H05B41/2923H05B41/2921H05B41/04
Inventor 市川知幸斋藤一树伊藤昌康
Owner KOITO MFG CO LTD