A pair of recommended ballast circuits are demonstrated in the following figures.
This function is performed by ballast. Magnetic ballast is an essential component in traditional discharge lamps and tubes. If you have an older fixture, you can switch from a magnetic ballast to an electronic ballast in a few minutes with some basic hand tools. Modern ballast designs use advanced electronics to more precisely regulate the current flowing through the electrical circuit. However, direct drop-in LED tubes are compatible only with fixtures that have electronic ballasts. Newer electronic ballasts are instant start (wired in ... the others can keep operating as the circuit between them and the ballast remains unbroken. So, locate the circuit breaker switch that provides power to the area where you will carry out the bypass and turn it off.
Magnetic ballasts may also vibrate at a low frequency.
You can determine whether you have a compatible fixture in seconds. Generally speaking, the PF of the magnetic ballast is 0.5, even after the capacitance correction, it can only reach about 0.8, and the electronic ballast can usually achieve 0.95~0.99. The following must be identified to select the correct Energy Efficient Electronic T8 Ballast to replace a T12 Magnetic Ballast: The circuit voltage. The type of existing lamps, the following are some examples. Older magnetic fluorescent ballasts are usually rapid start and wired in series. Ballast-compatible, "plug and play," or "direct drop-in" LED tubes make upgrading to cost-saving, long-life LED technology easy: simply take the fluorescent tubes out of your fixture and put the LED tubes in. In order to properly start them, an initial high current is needed which needs to be limited afterwards to prevent the lamp from blowing out.
Locate The Ballast On The fluorescent Light Fixture Now, locate the ballast on the existing fluorescent fixture.
Voltage fed half-bridge quasi-resonant lamp ballast (startup circuit shown shaded grey) Figure 3. The first is the minimal power factor circuit, along with the other works with a novel diode/capacitor settings to accomplish a power factor > 0.95. This is the source of the audible humming sound people associate with fluorescent lamps. The significance of this is that you make full use of every watt of electricity supplied by the power plant and make an outstanding contribution to environmental protection. Most T8 tubes will have a hidden ballast, covered with a casing and resting behind the tube light.
2. The lower power factor circuit proven in figure 3 welcomes 115 VAC or 230 VAC 50/60/400 Hz inputs to generate a moderate DC bus of 320 VDC.