China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

Magnetic chokes ensure that the pre-heating current, ignition voltage and lamp current, all remain within the specified tolerances for optimum operation of fluorescent lamps. Long lamp life can only be achieved by preheating the electrodes before the ignition voltage is applied to the lamp. The EC units heat to precisely the right temparature because if the preheat current is too low or too high the lamp electrodes will be destroyed and the life of the lamp cut short. The choke ensures a sufficiently high ignition voltage after the prehear phase by opening a glow starter or electronic starter. The latter automatically selects the right time to open the starter to reliably ignite the lamp at very high or very low ambient temparatures. The magnetic chokes are designed to very narrow tolerances so the impedance perfectly limits the lamp current and maximum luminous flex is achieved.

At the core of this part is a material used to produce its magnetic field. Coils used to filter higher frequencies may use an air-core or a ferrite core, while lower frequency coils may use an iron core. The material in the core determines the strength of the magnetic field and the inductance rate of the coil.

Inductors are similar to capacitors, with one key difference in how they work. Both store electrical charges that pass through them, but capacitors store the charge inside an insulator located between two conductors on the capacitor. A choke coil stores the electric charge in the magnetic field created around it instead of on any specific part of the coil itself. Both parts are used in electronic circuitry, but capacitors typically store electric charges while these coils filter them.

When choosing the best type to use in a circuit, the engineer will look at the voltage, the DC resistance of the coil, and the level of inductance. These factors determine which coil will most efficiently pass through the correct currents while blocking the unwanted ones. The frequency to be passed through determines the best types to use.

The low magnetic leakage field - and therefore the very low noise emission - means that the magnetic chokes from James Lighting can be places bear electrical equipment that is sensitive to interference.