The EPS emergency power supply is aimed at solving first-level load power supply equipment such as emergency lighting, accident lighting, and fire-fighting facilities. It provides an emergency power supply system with independent circuits in accordance with fire protection regulations. This system can provide emergency power supply in emergency situations. It is used to solve the problem that there is only one mains power supply lacking a second power source, or to replace the generator set to form a second power source, or as a power supply device for occasions that require a third power source.
EPS emergency power supply adopts single inverter technology, which integrates charger, battery, inverter and control schematic working device of EPS emergency power supply. The battery detection and shunt detection circuits are designed inside the system. The working principles of other main components are as follows:
1. Machine principle:
When the main power is normal, first convert the main power to pure direct current, filter out the interference in the main power, then charge the battery and output the main power; when the main power is abnormal, the DC inverter AC output stored in the battery is output. Ensure high-quality power supply for user load; manual maintenance bypass guarantees maintenance or repair of EPS under constant power.
2. Rectification and charging unit:
The main power input detection circuit sends the main power input voltage frequency and phase information to the MCU for calculation. When the main power voltage, frequency, and phase are within the normal range, the MCU sends a rectification control signal, and the rectified voltage slowly rises from 0V to the rated voltage. , Reduce the impact of input surge current. Since the battery pack and the DC bus operate in parallel, the rectifier charges the battery at the same time:
1. When the battery voltage is lower than the floating charge voltage, the rectifier works in the constant current mode. At this time, the MCU calculates and controls the charging current feedback of the battery and the battery capacity information set by the user;
2. When the battery is charged to the floating charging voltage, it switches to the constant voltage charging mode. At the same time, the MCU also performs temperature compensation charging on the battery according to the battery temperature information, and also performs regular maintenance management on the battery according to the battery usage (when the battery has not been charged and discharged for a long time, the MCU automatically switches to the uniform charging mode to activate the battery activity) To extend battery life and reduce user management burden.
3.IGBT inverter unit:
When the DC bus is normal, the MCU sends an inverter control signal. The inverter circuit drives the IGBT inverter bridge through the SPWM drive signal. After the transformer is isolated and transformed and filtered, it outputs pure sinusoidal AC power. The inverter adjusts the pulse width of the drive signal to slowly increase the output voltage from 0V to the rated voltage, and stabilizes the output through output feedback control. At the same time, it detects the output voltage and current to protect the inverter.
4. Microprocessor control center:
The microprocessor (MCU) calculates input, output, battery, and environment data at high speed, and then controls the operation and protection of the rectifier, inverter, and static switch, and responds to external operating instructions.
5. Automatic and manual bypass units:
The bypass circuit is to directly convert the input to the output through the switching circuit. When the inverter shuts down or fails, the MCU high-speed control static switch automatically switches to bypass power supply without interrupting the power supply of the load.
The bypass power supply can be the same power supply as the main power supply.
6. Display communication unit:
The display unit displays the operating status and data of the whole machine through LED and LCD, and also realizes remote monitoring through RS232, RS485, dry contact signal, SNMP card, etc., in cooperation with background software.
Linsheng mainly produces high-quality electrical products such as auto parts, emergency lights, quick starters, air compressors, vacuum cleaners, fault lights and spot lights. Have our own laboratory and the most advanced testing equipment in the industry to ensure product quality. Welcome to buy: https://www.linsheng.com/
EPS emergency power supply adopts single inverter technology, which integrates charger, battery, inverter and control schematic working device of EPS emergency power supply. The battery detection and shunt detection circuits are designed inside the system. The working principles of other main components are as follows:
1. Machine principle:
When the main power is normal, first convert the main power to pure direct current, filter out the interference in the main power, then charge the battery and output the main power; when the main power is abnormal, the DC inverter AC output stored in the battery is output. Ensure high-quality power supply for user load; manual maintenance bypass guarantees maintenance or repair of EPS under constant power.
2. Rectification and charging unit:
The main power input detection circuit sends the main power input voltage frequency and phase information to the MCU for calculation. When the main power voltage, frequency, and phase are within the normal range, the MCU sends a rectification control signal, and the rectified voltage slowly rises from 0V to the rated voltage. , Reduce the impact of input surge current. Since the battery pack and the DC bus operate in parallel, the rectifier charges the battery at the same time:
1. When the battery voltage is lower than the floating charge voltage, the rectifier works in the constant current mode. At this time, the MCU calculates and controls the charging current feedback of the battery and the battery capacity information set by the user;
2. When the battery is charged to the floating charging voltage, it switches to the constant voltage charging mode. At the same time, the MCU also performs temperature compensation charging on the battery according to the battery temperature information, and also performs regular maintenance management on the battery according to the battery usage (when the battery has not been charged and discharged for a long time, the MCU automatically switches to the uniform charging mode to activate the battery activity) To extend battery life and reduce user management burden.
3.IGBT inverter unit:
When the DC bus is normal, the MCU sends an inverter control signal. The inverter circuit drives the IGBT inverter bridge through the SPWM drive signal. After the transformer is isolated and transformed and filtered, it outputs pure sinusoidal AC power. The inverter adjusts the pulse width of the drive signal to slowly increase the output voltage from 0V to the rated voltage, and stabilizes the output through output feedback control. At the same time, it detects the output voltage and current to protect the inverter.
4. Microprocessor control center:
The microprocessor (MCU) calculates input, output, battery, and environment data at high speed, and then controls the operation and protection of the rectifier, inverter, and static switch, and responds to external operating instructions.
5. Automatic and manual bypass units:
The bypass circuit is to directly convert the input to the output through the switching circuit. When the inverter shuts down or fails, the MCU high-speed control static switch automatically switches to bypass power supply without interrupting the power supply of the load.
The bypass power supply can be the same power supply as the main power supply.
6. Display communication unit:
The display unit displays the operating status and data of the whole machine through LED and LCD, and also realizes remote monitoring through RS232, RS485, dry contact signal, SNMP card, etc., in cooperation with background software.
Linsheng mainly produces high-quality electrical products such as auto parts, emergency lights, quick starters, air compressors, vacuum cleaners, fault lights and spot lights. Have our own laboratory and the most advanced testing equipment in the industry to ensure product quality. Welcome to buy: https://www.linsheng.com/
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