At present, the battery power supply mode mainly adopts the following two forms: one is independent power supply, each emergency light comes with a spare battery, and is usually powered by the mains. Only when the mains power is cut off, the backup power is automatically put into operation; The type uses centralized power supply. Each emergency light itself does not have a power supply. When the utility power fails, it is powered by a dedicated centralized emergency power supply. Different internal control circuits must be provided for two different power supply modes. The control circuit designed in this paper is an independent power supply emergency light.
linsheng said: At present, most of the domestic emergency lighting fixtures are constructed with separate components and universal lC (such as 555, LM358) to build the control system. The state has a complete national standard for fire emergency lights (GBl7945-2000), which requires emergency luminaires with complete functions such as emergency conversion, charging protection and fault detection, protection and display. This requires a number of separate components and a single component. The characteristics of the requirements are also higher. Some manufacturers can only provide emergency conversion, charging timing and other functions for the purpose of cost reduction, but can not provide complete indicators of the requirements required by national standards such as fault detection, fault display and protection. There are also control chips for emergency lighting in the domestic market, but the main problems are:
1. The battery protection is not enough. Most of them use the slow charging method to continuously charge the emergency power supply. After the emergency power supply is full, there is no trickle charging process, which easily leads to overcharge of the emergency power supply;
2. No charging time is optional, and it cannot be adapted to different types of batteries;
3. Emergency lighting and emergency sign lights need to use different control chips;
4. The emergency working time does not reach the standard requirement of 90min;
5. The termination voltage is low and fails to meet 80% of the standard rated voltage requirements;
6. Charge and discharge endurance test The last discharge time is less than 85% of the initial discharge time.
https://www.linsheng.com
linsheng said: At present, most of the domestic emergency lighting fixtures are constructed with separate components and universal lC (such as 555, LM358) to build the control system. The state has a complete national standard for fire emergency lights (GBl7945-2000), which requires emergency luminaires with complete functions such as emergency conversion, charging protection and fault detection, protection and display. This requires a number of separate components and a single component. The characteristics of the requirements are also higher. Some manufacturers can only provide emergency conversion, charging timing and other functions for the purpose of cost reduction, but can not provide complete indicators of the requirements required by national standards such as fault detection, fault display and protection. There are also control chips for emergency lighting in the domestic market, but the main problems are:
1. The battery protection is not enough. Most of them use the slow charging method to continuously charge the emergency power supply. After the emergency power supply is full, there is no trickle charging process, which easily leads to overcharge of the emergency power supply;
2. No charging time is optional, and it cannot be adapted to different types of batteries;
3. Emergency lighting and emergency sign lights need to use different control chips;
4. The emergency working time does not reach the standard requirement of 90min;
5. The termination voltage is low and fails to meet 80% of the standard rated voltage requirements;
6. Charge and discharge endurance test The last discharge time is less than 85% of the initial discharge time.
https://www.linsheng.com
コメント