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Electronic ballast for gas discharging lamp

An electronic ballast and gas discharge lamp technology are applied in the field of electronic ballasts for gas discharge lamps to achieve the effects of improving efficiency, reducing tube consumption and simplifying control conditions

Inactive Publication Date: 2009-04-01
李宗凤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0074] The technical problem to be solved by the present invention is to propose a simple and low-cost circuit topology to overcome the defects of existing electronic ballasts

Method used

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  • Electronic ballast for gas discharging lamp
  • Electronic ballast for gas discharging lamp
  • Electronic ballast for gas discharging lamp

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Experimental program
Comparison scheme
Effect test

Embodiment approach 2

[0170] ★ The second embodiment of the present invention is attached figure 2 :

[0171] Embodiment 2 is a dual-tube push-pull power conversion stage, which is suitable for the application of high-power lamp tubes.

[0172] Its essence is to change the single-ended circuit in block 1 in the schematic diagram of the first embodiment to a push-pull circuit topology with dual power triodes symmetrically connected, and the working mode of the power triodes is the same as that of the single-ended circuit topology.

[0173] Oscillating resonant transformer T adopts secondary output, and adapts to different lamp operating voltages and mains power supply by using the change of transformer transformation ratio. In order to make the two tubes have the same conduction angle, the self-excited oscillation feedback voltage is taken from the symmetrical secondary voltage, and the feedback voltage coupling capacitor C11 and the feedback voltage phase-shifting inductor L11 are shared. becomes...

Embodiment approach 3

[0174] ★ See attached drawing 3 for the third embodiment of the present invention:

[0175] Embodiment 3 In the circuit of Embodiment 1, an overcurrent protection transistor Q13 is added, the emitter of Q13 is grounded, the collector is connected to the base of the power transistor Q11, and the current sampling resistor R16 is connected in series with the self-biased diode of the emitter of the power transistor Q11 Between D16 and the ground, it is used to detect the collector current of the power transistor Q11. The voltage drop on R16 is fed into the base of the overcurrent protection transistor Q13 through the resistor R15. When the power transistor Q11 is overcurrent, Q13 is turned on, so that the power transistor Q11 deadline.

[0176] In order to adapt to the application of 110V power supply voltage, the self-excited oscillation feedback voltage of the resonant self-dual transformer in Figure 3 is taken from an independent tap, and the power output voltage can be further...

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Abstract

The present invention discloses an electric ballast for a gas discharge lamp, including: a single-tube or double-tube power conversion stage, wherein the stage outputs sine wave and adopts collector amplitude modulation when the current flow angle is less than 120 degrees, and the amplifier tube conducts at zero-voltage; a voltage boosting start-up circuit controlled according to the lamp branch impedance angle variation; and a circuit, for timing heating of the filament when the voltages of two ends of the tube are at zero state. The invention has advantages of no need of electrochemical capacitor, magnetic loop impulse transformer, protective circuit, power factor calibrating circuit and IC control; flexible responding to a variety of lamp tubes and electricity voltages, large-scale useof non-boot-rush current, high power factor and low harmonics; simple circuit, few components, low-cost, long life and other advantages.

Description

Technical field [0001] The invention relates to an electronic ballast for a gas discharge lamp, which consists of three circuits including power conversion, voltage boosting start-up and timing heating. Background technique [0002] Electronic ballasts for gas discharge lamps can use half-bridge or push-pull circuit topology, and low-voltage DC power supply adopts single-tube flyback type. In 1995, CUK proposed a single-tube high power factor circuit topology <1> which has not been seen due to excessive voltage stress industrial applications. [0003] All kinds of circuit topologies can be self-excited or other excited. For detailed analysis of half-bridge and push-pull circuits, see <1>.<2>. [0004] 1. There are problems in the half-bridge circuit topology circuit: [0005] (1) Power tube overload in startup and deactivation states [0006] The half-bridge circuit is called a class D power converter, which outputs a symmetrical square wave. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/282
CPCY02B20/188Y02B20/186Y02B20/185Y02B20/00
Inventor 李宗凤
Owner 李宗凤