Dual half-bridge injection phase-locked power combining fluorescent 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 fluorescent lamp. The fluorescent lamp comprises a power supply filter, bridge rectifiers, a power factor correction device APFC, a fluorescent 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, 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 matches the fluorescent tube and enables the fluorescent tube to be turned 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 fluorescent lamp is suitable for large-power fluorescent lamp illumination occasions.

Description

technical field [0001] The invention relates to the technical field of electric light source lighting, in particular to a dual half-bridge injection phase-locked power synthesis fluorescent lamp. Background technique [0002] Electronic ballasts in the prior art generally use LC or RC oscillators as the electric light source of fluorescent lamps, and 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 . Requiring high-power lighting will inevitably increase the current of the device, so that the power consumption of the power tube will 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 through the coil, the 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 of fluorescent lamps, and 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

Requiring high-power lighting will inevitably increase the current of the device, causing the power consumption of the power tube to increase sharply and the temperature to 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 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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