To repair electronic energy-saving lamps, we must first eliminate false faults. It is not the quality of the lamp that the energy-saving lamp flashes intermittently after turning off the light. The main reason is that the electrical wiring installation is not standardized and the switch is located at the zero line. Just change the neutral line into the live line. When using a switch with neon lights, a micro-flow path can still be formed after turning off the lights, or a double switch is installed with wires, which sometimes causes flicker after turning off the lights.
Electronic energy-saving lamps have the advantages of low-voltage starting, no stroboscopic, no noise, high efficiency and energy saving, and long service life (more than 3000 hours, more than 3 times that of ordinary incandescent lamps), and are well received by consumers (especially in areas where the power supply voltage fluctuates frequently).
Electronic energy-saving lamps have glass cover type and bare type. There are three types of glass covers: ball type, ball column type and craft type. The first two series have four varieties: transparent, carved, colored and ivory. It has the advantages of beautiful appearance, not easy to damage the lamp tube during installation and collision resistance. The exposure types are H type, UH type, 3U type, 4U type, 2D type and spiral type. According to the color of light, it is divided into red, green, blue, yellow (color temperature is 2700K, which is warmer, similar to incandescent lamp) and white (color temperature is 6400K, which is colder, similar to fluorescent lamp); The lamp with a color temperature of 5000K is close to natural light, which is not irritating to the eyes and is more suitable for students and fine work. The electronic energy-saving lamp circuit introduced in this paper is shown in figure 1, and the printed board diagram is shown in figure 2. The soft start (filament preheating) circuit is added in the circuit, which can prolong the life of the lamp. Mostly used for eye protection lights and exit lights.
To repair electronic energy-saving lamps, we must first eliminate false faults. It is not the quality of the lamp that the energy-saving lamp flashes intermittently after turning off the light. The main reason is that the electrical wiring installation is not standardized and the switch is located at the zero line. Just change the neutral line into the live line. When using a switch with neon lights, a micro-flow path can still be formed after turning off the lights, or a double switch is installed with wires, which sometimes causes flicker after turning off the lights.
When repairing electronic energy-saving lamps, for the sake of safety, use 1: 1 isolation transformer to isolate the mains electricity.
First, the lamp can't be repaired in normal lighting.
1. It is common that the resonant capacitor C6 is broken down (short circuit) or its voltage resistance is reduced (soft breakdown), so it should be replaced with a high-quality polyester or CBB capacitor with the same capacity with a voltage resistance above 1kV.
2. The filament is open. If the lamp tube is not seriously blackened, a 0.047 μ f/400 V polyester capacitor can be connected in parallel at both ends of the broken wire lamp pin for emergency use.
3. If R 1 and R2 are open or have variable resistance values (generally R 1 is more likely to fail), replace them with 1/4W high-quality resistors with the same resistance values.
4. The triode is open. If it is found that only one triode is open, but one transistor cannot be replaced, a pair of switches of the same model with withstand voltage above 400V should be replaced. Otherwise, it is easy for the lamp to roll again or burn the pipe.
5. The light is flashing. If the lamp tube is not seriously blackened, check D5 and D6 for virtual welding or open circuit. If D5 and D6 are soft-broken, or the filter capacitor C 1 is defective, the light will also flash.
6. The lamp is very difficult, sometimes it can be lit by touching the lamp tube or the lamp will roll. This may be because C3 and C4 are insufficient and do not match.
7. If the filament of a single low-power energy-saving lamp is red or glowing after lighting, check whether there is soft fault in D 1 ~ D4, whether there is reverse connection or leakage in C 1, and whether there is short circuit in the power supply part.
8. The cores of choke coil L and oscillating transformer B are damaged. If you only change the magnetic core, you should pay attention to three points: (1) use the magnetic core that meets the requirements, otherwise the inductance value of the choke coil may be very different, which will bury hidden dangers for the energy-saving lamp; (2) The magnetic gap should not be too small to avoid magnetic saturation; (3) After the magnetic gap is padded with suitable filler, it is bonded with adhesive and wrapped with high temperature resistant and flame retardant adhesive tape to prevent looseness. In addition, you can't connect the terminal with the same name of B by mistake.
9. When repairing the electronic ballast using trigger tube, the bidirectional trigger diode should be mainly checked. The tube is generally DB3 type with a bidirectional breakdown voltage of 32 4V.
Second, the maintenance parts are obviously damaged.
1. Although the fuse is not blown, the wire at the incoming line is not burnt out, and the resistance is obviously damaged, the triode will undoubtedly be damaged. This may be caused by the aging of the lamp tube, followed by the poor use environment, or the loss of C 1 capacity. For the first two cases, when replacing the resistor and triode, it is best to replace the matching C3 and C4 small electrolysis. For the latter, C3 and C4 need not be substituted. Because C 1 works at high voltage, it is necessary to choose high-quality heat-resistant electrolytic capacitors when replacing it.
2. If C 1, Q 1 and Q2 are intact in the case of fuse and incoming wire, it is necessary to carry out routine inspection and withstand voltage test on D 1 ~ D4 one by one. Or replace D 1 ~ D4 with high-quality products.
3.C 1 burst. If there are fuses and broken wires, all D 1 ~ D4 and C 1 should be replaced.
4. If only the resistor-capacitor on Q2 side and the triode are burnt out, check whether C2 is broken down.
5. If the high-frequency transformer B is damaged, a high-strength wire of ∮ 0.32 mm can be wound on the high-frequency magnetic ring of 10mm×6mm×5mm, with 4 turns for T 1 and T2 respectively; T3 is 8 laps (pay attention to the head and tail). Choke l: lamp power is 5 ~ 40W, corresponding to1.5 ~ 5.5mh.
Third, a few electronic energy-saving lamps interfere with remote control color TV.
The inductance of L or the capacitance of C2 can be adjusted so that it will not interfere with the remote control TV and can work safely.
Four, the use of energy-saving lamps matters needing attention
1. Energy-saving lamps cannot be used in the circuits of dimming desk lamps, delay switches and induction switches.
2. Avoid using in high temperature and high humidity environment.
3. Electronic energy-saving lamps, like other lighting lamps, should not be turned on and off frequently.