The emergency lighting system used in China is mainly controlled by its own power supply. The normal power supply is connected to the ordinary lighting power supply circuit. The emergency light battery is charged normally. When the normal power supply is cut off, the backup power supply (battery) is automatically powered. This type of emergency light has a large number of electronic components such as transformer, voltage regulator, charging, inverter, battery, etc. inside the lamp. The battery needs to be charged and discharged during use, maintenance and failure. The other is centralized power supply centralized control type. There is no independent power supply in the emergency light. When the normal lighting power supply fails, the centralized power supply system supplies power. In this form of emergency lighting system, the complicated electronic circuits inside all the lamps are omitted. The emergency lighting fixtures are the same as the ordinary lamps, and the centralized power supply system is set in a dedicated room.
Compared with the self-contained power supply independent control type emergency luminaire, the centralized power supply centralized control emergency light has the advantages of convenient centralized management, user self-examination, fire supervision and inspection, extending lamp life and improving emergency evacuation efficiency. The system has good reliability and service life. Long, easy to maintain and manage, and low system price. However, centralized power supply centralized control type emergency luminaires have no backup power supply (battery) in each emergency luminaire. If the power supply line fails, it will directly affect the normal operation of the emergency lighting system, so special fire protection requirements are applied to the power supply line. . The self-contained power supply independent control type emergency luminaire has no backup power supply (battery) in each emergency luminaire, so there is no special requirement for the power supply line, and the power supply line failure does not affect the standby power supply. When the emergency light fails, it generally affects only the light itself, and has little effect on the whole system.
When selecting emergency lighting, the emergency lighting system should be selected according to the specific circumstances. Generally speaking, new construction projects or projects with fire control room should be unified in the construction process as much as possible, and centralized power supply centralized control type emergency lighting should be selected; for small sites, later rectification or secondary decoration renovation projects should be selected Power supply independent control type emergency lighting.
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