In the production process of oxide cathode fluorescent lamps, sophisticated, measurement and control and point life are obviously several important links in the product process. Sophisticated is to remove the impurity gas inside the tube, further activate the cathode, make the lamp parameters consistent, stable performance; measurement and control is related to the classification of good and bad tubes, so as to avoid unnecessary complaints and returns from customers after shipment; The method of verifying the quality of the lamp. Practice has proved that the equipment that can adapt to the production requirements of sophisticated, measurement and control and point life is only the power frequency inductance lighting device. Therefore, the power frequency method in the production process of the oxide cathode fluorescent lamp must be properly set.
1. Power frequency configuration method
To produce high-frequency preheated cathode fluorescent lamps, a high-frequency AC power source with a frequency of 20 kHz ∽ 26 kHz must be used according to the IEC standard. This kind of high-frequency AC power supply that meets the production demand, PHILIPS is priced at 5 million yuan, OSRAM is priced at 1 million yuan, and NEC is priced at 800,000 yuan. This equipment is not only expensive to import, high-frequency electrical equipment has a high failure rate, and maintenance costs are considerable.
How to provide a power frequency configuration of a high-frequency preheated cathode fluorescent lamp, including the sophisticated, measurement and control, and power-frequency configuration of the high-frequency preheated cathode fluorescent lamp, so that the manufacturer does not have to import expensive high-frequency AC power, and the cost is low. Long service life, almost no maintenance, and effectively meet the needs of production? Let's discuss this issue.
The scientific development to today's law of conservation of energy is always unstoppable. As long as a certain energy value is measured, whether it is measured by high-frequency means or measured by power frequency, its value should be conserved. In the lighting system, the current flowing through the lamp should be the same whether the high frequency or the power frequency should be the same, and the active power of the generated lamp should be the same; the only difference here is the tube pressure.
The power frequency configuration method of the high frequency preheated cathode fluorescent lamp is as follows:
Determine the tube pressure value of the high-frequency tube to be matched by the parameters provided by the IEC standard; illuminate the tube with an inductive lighting device with similar tube flow and power, adjust the tube flow through the contact regulator, and record the tube pressure after stabilization; record The tube pressure is converted into an effective value by the power factor, and compared with the standard. When the positive and negative error permit, the lamp electrical parameter is up to standard; the lamp electrical parameter reaches the standard power frequency tube pressure (non-effective value) It is the reference voltage for designing the power frequency configuration of the high-frequency preheated cathode fluorescent lamp with sophisticated, measurement and control and point life.
In Figure 1: ∽ indicates the power frequency AC power supply provided by the power grid, B1 is the contact voltage regulator, B2 is the control transformer, A is the AC current meter, V0 and V1 are AC voltmeters, and L is the power flow inductance with similar flow and power. Lighter, H is the high-frequency preheated cathode fluorescent tube that meets the standard, S is the starting device, and K0 and K1 are the toggle switches.
Connect the lighting circuit as shown in the figure, turn on the switch K0, hold the starting device S preheating the cathode, and then release the starting device S to illuminate the lamp after the cathode is warmed up; adjust the contact voltage regulator B1 to make the reading of the ammeter A The pipe flow is the same; B2 is the control transformer for boosting to meet the requirements of the starting voltage of different high-frequency preheating cathode fluorescent lamps; after the lighting is stabilized, the switch K1 is turned on to obtain the power frequency tube pressure of the lamp; V0 is the start lamp The input voltage of the tube.
The power frequency tube voltage (V1 meter reading value) of the lamp electrical parameter is the reference voltage for designing the power frequency configuration of the high frequency preheating cathode fluorescent lamp, the measurement, control and point life.
The stability of the measurement and control is considered. The operating current and power of the designed inductive lighting device are consistent with the parameters of the lamp under test. The working voltage of the power supply should be 5% to 10% higher than the reading of the power frequency tube voltage V1; The operating current and power of the designed inductive lighting device are consistent with the parameters of the sophisticated lamp. The working voltage of the power supply should be 10% to 20% higher than the reading of the power frequency tube voltage V1; the life of the point is considered economical, design The operating current and power of the power frequency lighting inductive lighting device are consistent with the parameters of the high frequency lamp being spotted, and the power supply voltage should be 1% to 5% higher than twice the reference voltage.
The power supply configuration of the power frequency preheating cathode fluorescent lamp often sets the power supply working voltage to be consistent with the grid power supply voltage, and is not suitable for the requirements of sophisticated, measurement and control and point life in production. It is also necessary to use the above method to reset the sophisticated use and measurement control. And power frequency inductance lighting for point life.
2. Power frequency sophisticated method
Sophistication can be achieved by burning a light tube. The sophisticated equipment is called a sophisticated machine. It generally has three parts: a cathode preheating zone, a sophisticated zone (more than one zone), and a startup detection zone. The existing relevant information introduces the action process of the lamp on the veteran machine:
1. The filament is electrically heated to further activate the cathode;
2. Lighting the lamp tube to remove impurities by discharge;
3. Increase the ignition voltage;
4. Reduce the voltage and measure the start;
