1. Characteristics and Wide Applications of High-Pressure Sodium Lamps: High-pressure sodium lamps emit a golden-white light and possess advantages such as high luminous efficiency, low power consumption, long lifespan, strong fog penetration, and non-infestation of insects. They are widely used in lighting for roads, highways, airports, docks, shipyards, stations, squares, street intersections, industrial and mining enterprises, parks, courtyards, and plant cultivation. High color rendering high-pressure sodium lamps are mainly used for lighting in stadiums, exhibition halls, entertainment venues, department stores, and hotels. The working principle of a high-pressure sodium lamp is as follows: When the bulb is started, an electric arc is generated between the electrodes at both ends of the arc tube. Due to the high temperature of the arc, the sodium amalgam inside the tube is heated and evaporated into mercury vapor and sodium vapor. The electricity emitted from the cathode moves towards the anode, colliding with the atoms of the discharge material, causing them to gain energy and become ionized and excited. Then, it returns from the excited state to the stable state; or it changes from the ionized state to the excited state and returns to the basic state in an infinite cycle. The excess energy is released in the form of light radiation, thus producing light. After the high-pressure sodium lamp is started, in the initial stage, it is a low-pressure discharge of mercury vapor and xenon gas. At this point, the bulb's operating voltage is very low, but the current is very high. As the discharge process continues, the arc temperature gradually rises. The vapor pressure of mercury and sodium is determined by the temperature of the coldest end of the discharge tube. When the temperature of the cold end of the discharge tube stabilizes, the discharge tends to stabilize, and the bulb's luminous flux, operating voltage, operating current, and power are all in normal operating condition. Under normal operating conditions, the entire startup process takes about 10 minutes. 2. General Solution: Due to the characteristic of high-pressure sodium lamps being extinguished or restarted due to voltage instability or interruption, uninterruptible power supplies (UPS) have been widely adopted in the application of high-pressure sodium lamps. However, UPS power supplies generally adopt a double-conversion operating mode. Although this can provide high-quality power output, the efficiency is greatly reduced after the two-stage conversion, generally between 80% and 90%. Even the latest high-efficiency UPS can only reach 95%. Taking a 100KVA UPS as an example, its efficiency is generally around 90%. Then, the UPS's own losses alone reach 10K, consuming 10 kWh per hour, 240 kWh per day, and after one year, the UPS's own losses will reach a staggering 87,600 kWh. Meanwhile, due to the prolonged load on the UPS inverter, the lifespan of the UPS itself is significantly reduced. Therefore, the cost of using a UPS to provide backup power for high-pressure sodium lamps is very high. With the rapid development of China's economy, energy has become scarce; some areas have begun to implement measures such as power rationing and staggered power consumption to alleviate the power supply shortage, and the country has also issued a call to build a conservation-oriented society. In response to the national call and to significantly reduce the operating costs for users, solving the problem of low UPS conversion efficiency has become an urgent matter. Burke has invested a significant amount of time and money in developing a new type of fast-switching emergency power supply (EPS). 3. Burke EPS's targeted solution: An emergency power supply (EPS) is a backup power supply used for fire-fighting lighting fixtures. When the main power is normal, it directly supplies power from the main power source; when the main power is abnormal, it switches to battery inverter power supply. This eliminates the need for conversion when the main power is supplied, directly powering the fire-fighting lighting fixtures, greatly improving efficiency. However, traditional EPS power supplies generally have long switching times and can only be applied to ordinary lighting fixtures. Burke has conducted extensive switching tests on high-pressure sodium lamps. The results show that if the power supply to a high-pressure sodium lamp is interrupted for more than 3.8 ms, the lamp will extinguish and need to be restarted, resulting in approximately 10 minutes of interrupted lighting. Addressing the specific power supply requirements of high-pressure sodium lamps, Burke Power Equipment Co., Ltd. has developed a new type of ultra-fast switching EPS power supply through precise design. Besides high-pressure sodium lamps, it is widely used in metal halide lamps, mercury lamps, and other lighting fixtures with high power switching time requirements. The working principle of Burke's ultra-fast switching EPS power supply is as follows: The microprocessor control center primarily detects and performs high-speed calculations on the input, battery, and output; the CPLD chip logically synthesizes all input, output, and control signals. When the main power input is normal, the EPS switches to the bypass static switch output. After passing through the input filter, input noise is filtered out to supply the output; simultaneously, the charger charges the battery pack, the inverter starts, and the system enters no-load standby mode. When the input is abnormal, the microprocessor control center quickly switches to the inverter static switch output, ensuring uninterrupted output. Currently, the switching time of Burke's YJ/YJS series EPS is generally controlled within 1.8ms, significantly less than the 3.8ms power outage time required for high-pressure sodium lamps. This ensures the safe and reliable continuous operation of high-pressure sodium lamps during such a short power interruption. In addition to employing new designs and circuits to accelerate switching time, Burke further improves overall efficiency and reduces the inverter's power consumption by using the internationally leading sixth-generation IGBT modules from the German company EUPEC in all its UPS and EPS series. Compared to the third-generation IGBT modules commonly used in the domestic UPS industry, the sixth-generation IGBT modules feature lower internal resistance and lower heat generation, making them more energy-efficient and environmentally friendly. For example, three-phase UPS or EPS power supplies using third-generation IGBTs typically require three cooling ducts due to the low efficiency and high heat generation of the IGBTs. This not only makes it difficult to improve overall efficiency but also results in a large number of cooling fans, a bulky chassis, and high noise levels. Burke's series of power supplies utilizes internationally leading, more environmentally friendly sixth-generation IGBT modules, significantly reducing overall heat generation. Compared to other UPS or EPS systems using third-generation IGBT modules, the overall efficiency is generally 4% to 5% higher. Currently, Burke's three-phase UPS or EPS systems typically employ only one cooling duct, resulting in improved overall efficiency, a smaller chassis size, and significantly reduced noise levels due to a two-thirds reduction in the number of fans, minimizing noise pollution. Burke Power Equipment Co., Ltd. is committed to the research and development of energy-saving and environmentally friendly new power and equipment. Producing green and environmentally friendly power supplies is our consistent principle. To enable EPS to replace UPS as the power guarantee for the safe operation of high-pressure sodium lamps, reduce operating costs for users, and respond to the national call for building a conservation-oriented society, we have conducted long-term technological research and development on reducing switching time and improving overall efficiency. Burke's latest Fast Switching Emergency Power Supply (EPS) has been successfully launched on the market. We believe that Burke's new Fast Switching Emergency Power Supply (EPS) will meet the needs of users in both fire protection applications and energy conservation and environmental protection. The waveform diagram for main power failure switching to emergency mode is as follows: The above diagram shows the actual waveform measured by an oscilloscope: Channel 2 is the main power input waveform, and Channel 1 is the output waveform. As shown in the diagram, the main power voltage is 237Vac, the emergency output voltage is 220Vac, and the switching time is 1.8ms. The waveform diagram for main power recovery is as follows: The above diagram shows the actual waveform measured by an oscilloscope: Channel 1 is the EPS output waveform, and Channel 2 is the main power input waveform. As shown in the diagram, the main power voltage is 237Vac, the emergency output voltage is 220Vac, and the switching time is 0.8ms.