Solar power supply four-full-bridge injection-locking power synthesis low-voltage sodium lamp group

Abstract

The invention relates to the technical field of electric light source illumination and specifically discloses a solar power supply four-full-bridge injection-locking power synthesis low-voltage sodium lamp group. Two RC oscillators are together connected to a resistor R3 and a capacitor C4 for synchronous oscillation. A self-sustained oscillation chip 4, an output power transformer T1 of a full-bridge inverter A, a self-sustained oscillation chip 6, and an output power transformer T2 of a full-bridge inverter B are fed into an addition coupler for power synthesis. The synthesized power matches a low-voltage sodium lamp tube group. Signals of a reference crystal oscillator are injected into RC oscillators of the two self-sustained oscillation chips 4, 6 through a frequency divider for phase locking. Large-power illumination is achieved. Excessive temperature rise of the device, changes of oscillation frequency, imbalanced power and dim light are avoided. Signals of a lamp tube abnormal current detector are accessed to SD ends of oscillators of the two self-sustained oscillation chips 4, 6 through a triode. Oscillation is rapidly stopped. Power MOS tubes of the full-bridge inverters are further turned off. The low-voltage sodium lamp group is suitably used in large-power low-voltage sodium lamp illumination occasions.

Description

technical field [0001] The invention relates to the technical field of electric light source lighting, in particular to a solar power source four full bridge injection locking power synthesis low pressure sodium lamp group. Background technique [0002] In the prior art, an LC or RC oscillator is usually used as the low-pressure sodium lamp electric light source, and the generated oscillation frequency is not stable enough due to the poor stability of temperature changes, resulting in a decrease in light intensity, although the structure is simple and the cost is low. However, in order to obtain high-power lighting, the device current is bound to increase, so that the power consumption of the oscillating power tube increases sharply, and the temperature rises and the oscillation frequency changes. As a result, the power amplitude of the light changes with the frequency. At the same time, when the temperature of the coil increases, the magnetic permeability decreases, the mag...

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Problems solved by technology

[0002] In the prior art, LC or RC oscillators are usually used as the light source for low-pressure sodium lamps. 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

However, in order to obtain high-power lighting, the current of the device must be increased, and the power consumption of the oscillating power tube will increase sharply and the temperature will rise too high. The oscillation frequency will change, and as a result, the power amplitude of the light will be unbalanced with the frequency change.

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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