1.You need to clarify your needs. Here are some key questions:
Application lamps: What lamps are used for?
Power: Confirm the power of the lamp and the emergency power
Emergency time: How long does the customer want the emergency power supply to provide emergency power? For example, 3 hours, 2 hours or other.
Output voltage: What voltage does the lamp used by the customer work at? Such as 12V, 24V, 120V, 220V, etc.
Use environment: Will the emergency power supply be used indoors or outdoors? Will the ambient temperature, humidity, etc. affect the choice.
2.Choose a suitable emergency power supply
Requirement: my request is for led emergency light 40 watts 220 volts with backup battery for 3 hours period of time, emergency 3w
Assuming the efficiency is 80%, the lamp board voltage is 36V
Pin=3w÷0.8=3.75w
Required battery energy: 3.75w×3h=11.25Wh
Assuming the battery voltage is 6.4v, the battery capacity is:
11.25Wh÷6.4v≈1.76Ah
3. Battery boost
The process of boosting the battery voltage from 6.4V to 54V means using a boost converter to increase the battery voltage to a higher voltage level. The change is mainly the output voltage of the emergency power supply in order to drive the load or device that requires a higher voltage.
Definition of boost converter
Boost converter: A power conversion circuit that can convert a lower input voltage (6.4V in this case) to a higher output voltage (such as 54V). This circuit usually uses inductors, capacitors, and switching elements (such as MOSFETs) to achieve energy conversion.
Why is boost needed?
Driving high-voltage devices: Some LED drivers, electronic devices, or lighting systems require a power supply higher than the battery voltage to work properly. For example, many high-power LED lighting devices may require a higher driving voltage to achieve the desired brightness.
Battery operating status: In some applications, the battery voltage (such as 6.4V) may be in a charging or low-power state, and the device requires a higher voltage to maintain normal operation. In this case, boosting can provide the required voltage level.
Working principle
Basic principle: The boost converter increases the output voltage by controlling the switch (such as MOSFET) to open and close, using the inductor to store energy and release it when the switch is closed. The output voltage can be controlled by adjusting the operating frequency and duty cycle of the switch.
Switching element: The switching element adjusts the time that the current flows through the inductor by quickly turning on and off, thereby controlling the increase in voltage. Through this process, the low-voltage battery output (such as 6.4V) can be boosted to the high voltage (such as 54V) required by LED lamps
Application scenario
LED drive: In scenarios where higher voltage is required to drive high-power LED lamps, the boost converter can increase the lower voltage of the battery to the required level.
Portable devices: Some portable electronic devices may use lower voltage batteries, but require higher voltage power supply in certain situations.
4. When choosing an emergency power supply, it is very important to consider the lamp power and the lamp board voltage. Here are some specific reasons and considerations:
Lamp power
·Power matching: The output power of the emergency power supply must match the power of the lamp. For example, if the power of the lamp is 10W, and the emergency power supply can only provide 5W output power, the lamp may not work properly or reach the expected brightness during a power outage.
·Power in emergency mode: Make sure that the emergency power supply provides enough power in emergency mode to maintain the normal operation of the lamp in the event of a power outage.
Lamp board voltage
·Voltage compatibility: The operating voltage of the lamp (such as 12V, 24V or other voltage levels) must match the output voltage of the emergency power supply. If the lamp requires a voltage of 24V and the emergency power supply only provides 12V, the lamp will not operate properly.
·Boost or buck requirements: If the output voltage of the emergency power supply does not match the lamp, a boost or buck converter may be required to adjust the voltage, increasing the complexity and cost of the design.
Safety of the whole system
· Protection function: Selecting the appropriate emergency power supply can ensure that the lamps are properly supplied with power in the event of a power outage, avoiding the risk of power overload or lamp damage.
· Overtemperature and short circuit protection: Ensure that the selected emergency power supply has the necessary protection functions to cope with emergencies.
Use scenarios of lamps
· Application environment: Different lamps may have different power and voltage requirements in different application scenarios (such as commercial, industrial, residential, etc.), and these factors need to be considered when selecting an emergency power supply.
Additional considerations
· Dimming function: If the lamp supports dimming function, it is necessary to ensure that the emergency power supply can also support the corresponding dimming technology (such as 0-10V dimming, thyristor dimming, etc.).
· Service life: Proper matching can extend the service life of lamps and emergency power supplies.