Double-full-bridge injection phase-locking power synthesis electrodeless lamp group

Abstract

The invention relates to the technical field of an electric light source and especially relates to a double-full-bridge injection phase-locking power synthesis electrodeless lamp group. Two RC oscillators are connected with a resistor R11 and a capacitor C14 for synchronous oscillation. A self-sustained oscillation chip 4 and a full-bridge inverter A output power transformer T1, and a self-sustained oscillation chip 6 and a full-bridge inverter B output power transformer T2 are fed into an addition coupler in a reverse-phase way for power synthesis, and the synthesized power further undergoes voltage boost and is then coupled to an electrodeless lamp tube group through magnet ring inductors. Signals of a reference crystal oscillator are injected into the RC oscillators of the two self-sustained oscillation chips 4, 6 through a frequency divider for phase locking, and thus large-power illumination is achieved, and luminance declination caused by power unbalance resulted from oscillation frequency change since temperature rise of a device is too high is avoided. Signals of a lamp tube abnormal current detector are accessed to SD ends of the oscillators of the two self-sustained oscillation chips through a triode, so that oscillation is controlled to stop rapidly and full-bridge inverter power tubes are further turned off. The electrodeless lamp group is suitable for meeting rooms, living rooms and households for illumination.

Description

technical field [0001] The invention relates to the technical field of electric light source lighting, in particular to a double full-bridge injection phase-locked power synthesis electrodeless lamp group. Background technique [0002] In the prior art, an LC or RC oscillator is usually used as the electric light source of the electrodeless lamp group. The oscillation frequency generated is affected by the poor stability of temperature changes and the power is not stable enough, resulting in a decrease in light intensity. Although the structure is simple and the cost is low. In order to obtain high-power lighting, the current of the device must be increased, which will cause the power consumption of the oscillating power tube to increase sharply and the temperature will rise too high, resulting in a change in the oscillation frequency. As a result, the power amplitude of the light will be unbalanced as the frequency changes. At the same time, when the large current passes th...

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Problems solved by technology

[0002] In the prior art, LC or RC oscillators are usually used as the electric light source of the electrodeless lamp group. The oscillation frequency generated is affected by the poor stability of temperature changes and the power is not stable enough, resulting in a decrease in light intensity. Although the structure is simple and the cost is low

In order to obtain high-power lighting, the current of the device must be increased, resulting in a sharp increase in the power consumption of the oscillating power tube and an excessive temperature rise, resulting in a change in the oscillation frequency. As a result, the power amplitude of the light will be unbalanced as the frequency changes.

At the same time, when the large current passes through the coil, the temperature rises and the magnetic permeability decreases, and the magnetic saturation inductance becomes smaller and the impedance tends to zero. The working time of the lamp is proportional to the temperature rise, and the temperature rise accelerates the aging of the device. Burning out components shortens service life

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