Double-half-bridge injection phase-locking power synthesis metal halide lamp

Abstract

The invention relates to the technical field of electric light source illumination, and specifically discloses a double-half-bridge injection phase-locking power synthesis metal halide lamp. The metal halide lamp comprises a metal halide lamp tube, a reference crystal oscillator, a frequency divider, two self-sustained oscillation chips 4, 6, a half-bridge inverter A, a half-bridge inverter B, an addition coupler, a frequency modulation signal generator, and a lamp tube trigger circuit. RC oscillators of the two self-sustained oscillation chips 4, 6 are connected with a resistor R4 and a capacitor C5 for synchronous oscillation. The self-sustained oscillation chip 4 and a half-bridge inverter A output power transformer T1, and the self-sustained oscillation chip 6 and a half-bridge inverter B output power transformer T2 are fed into the addition coupler in a reverse-phase manner. The synthesized power is fed into the lamp tube trigger circuit for turning the metal halide lamp on. Signals of the reference crystal oscillator are injected into the RC oscillators of the self-sustained oscillation chips 4, 6 through the 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. Triangular wave signals of the frequency modulation signal generator are accessed to the RC oscillators of the self-sustained oscillation chips 4, 6 for suppressing light scintillation in a frequency modulation way. The metal halide lamp is suitable for large-power metal halide lamp strong light illumination occasions.

Description

technical field [0001] The invention relates to the technical field of electric light source lighting, in particular to a double half-bridge injection phase-locked power synthesis metal halide lamp. Background technique [0002] Electronic ballasts in the prior art generally use LC or RC oscillators as the electric light source of metal halide lamps, and 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 this electronic ballast has a simple structure, low cost. To obtain high-power lighting will inevitably increase the high current of the device, resulting in a sharp increase in the power consumption of the oscillating power tube and an excessively high 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 c...

AI Technical Summary

Problems solved by technology

[0002] Electronic ballasts in the prior art generally use LC or RC oscillators as the electric light source of metal halide lamps, and 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 this electronic ballast has a simple structure, low cost

In order to obtain high-power lighting, it is necessary to increase the high current of the device, 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

Images