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An electronic ballast is usually quieter than a magnetic one, which produces a line-frequency hum by vibration of the core laminations. [4] Electronic ballasts are often based on switched-mode power supply (SMPS) topology, first rectifying the input power and
A shunt resistor, which has been connected in parallel across the filament before it burnt out, will then short out to bypass the burnt filament and allow the rest of the string to light. If too many lights burn out however, a shunt will also burn out, requiring the use of a multimeter to find the point of failure.
Typical usages include: Electrical ballast circuits to switch them off in the event of voltage falling below the operational value. [2]Switched-mode power supplies.When the system supply output impedance is higher than the input impedance of the regulator, an UVLO with a higher hysteresis should be used to prevent oscillations before settling down to a steady state and possible malfunctions of ...
Kettering ignitions often had the ignition switch bypass the ballast resistor when in the start position. During starting the battery voltage drops, and bypassing this resistor allows a higher voltage across the coil so more energy could be delivered.
The new high-frequency ballast draws only 2 W, rather than the 6-10 W of the old ballast, increasing the efficiency of the system. [4] Changing to this type of lamp without taking the ballast out of operation (rather than simply bypassing it) results in an increased power factor for the fitting.
The name comes from blocking—"choking"—high frequencies while passing low frequencies. It is a functional name; the name "choke" is used if an inductor is used for blocking or decoupling higher frequencies, but the component is simply called an "inductor" if used in electronic filters or tuned circuits.
Fluorescent & discharge lighting is more efficient than incandescent lighting. Fluorescent lighting with conventional magnetic ballasts will see a reduced power consumption, but also a reduced lumen output from the lamp. Fluorescent lamps on modern electronic ballasts will use approximately the same power and give the same light. [3]
Noise caused by other circuit elements is shunted through the capacitor, reducing the effect they have on the rest of the circuit. It is most commonly used between the power supply and ground. For higher frequencies an alternative name is bypass capacitor as it is used to bypass the power supply or other high impedance component of a circuit.