Double-half-bridge injection phase-locking power synthesis halogen lamp group

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 halogen lamp group. The halogen lamp group comprises a power supply filter, bridge rectifiers, a power factor correction device APFC, a halogen lamp group, a reference crystal oscillator, a frequency divider, two self-sustained oscillation chips 4, 6, a half-bridge inverter A, a half-bridge inverter B, and an addition coupler. RC oscillators of the two self-sustained oscillation chips 4, 6 are connected with a resistor R11 and a capacitor C15 for synchronous oscillation. The self-sustained oscillation chip 4 and a half-bridge inverter A output power transformer T2, and the self-sustained oscillation chip 6 and a half-bridge inverter B output power transformer T3 are fed into the addition coupler in a reverse-phase manner. The synthesized power is accessed to the halogen lamp group for turning the halogen lamp group on. Signals of the reference crystal oscillator are injected into the RC oscillators of the two 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. The halogen lamp group is suitable for commercial decorative large-power spotlight 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 halogen lamp group. Background technique [0002] Electronic ballasts in the prior art generally use LC or RC oscillators as the electric light source for halogen lamps. The oscillation frequency generated is affected by poor temperature stability and the power is not stable enough, resulting in a decrease in light intensity. Although this electronic ballast has a simple structure and low cost 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 t...

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Problems solved by technology

[0002] Electronic ballasts in the prior art generally use LC or RC oscillators as the electric light source for halogen lamps. The oscillation frequency generated is affected by poor temperature stability and the power is not stable enough, resulting in a decrease in light intensity. Although this electronic ballast has a simple structure and low cost 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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