Direct-current emergency lighting power supply circuit

Abstract

The utility model discloses a direct-current emergency lighting power supply circuit, which comprises a dual-power-supply change-over switch, a rectifier, a storage battery pack, a charger, a chopper, an output loop, a local control system and a remote control center, and is characterized in that the dual-power-supply change-over switch is connected with the storage battery pack through the charger; the dual-power change-over switch is connected with the output loop through the rectifier to supply power to the load to form a constant power supply loop, the storage battery pack is connected with the output loop through the chopper to supply power to the load to form an emergency power supply loop, and the storage battery pack is directly connected with the output loop to supply power to the load to form a battery direct supply loop. Direct current provided by the constant power supply loop, the emergency power supply loop and the battery direct supply loop is output by a main output switch of the output loop, and the output loop is provided with a bypass output switch. According to the utility model, the diversified and high-standard requirements of users can be met, the rectifier, the charger and the chopper have redundant design, the reliability is high, and the output voltage is adjusted by a local control system and is remotely controlled by an upper computer.

Description

Technical Field

[0001] The utility model belongs to the technology of fire emergency lighting power supply, in particular to a DC emergency lighting power supply circuit. Background Art

[0002] Fire emergency lighting power supplies are designed to provide emergency power to firefighters. They can continue to supply power to loads during utility power failures and anomalies, ensuring fire emergency, evacuation lighting, and signage requirements, ensuring safe emergency power supply after a power outage. Existing fire emergency lighting power supplies output AC power. Under normal power conditions, AC emergency lighting power supplies are directly powered by the utility power. In the event of a utility power failure, an inverter converts the DC power stored in the battery into AC power. Due to high costs, inverters generally lack redundancy, resulting in relatively low reliability in emergency power supply mode.

[0003] DC power is expected to become the emergency power supply method in the future due to its advantages such as strong stability, easy control, low interference, and better load-friendliness. However, there are currently no DC emergency lighting power supply products on the market. Utility Model Content

[0004] The purpose of the utility model is to provide a DC emergency lighting power supply circuit which has low cost, high reliability and can meet diverse application requirements.

[0005] The purpose of the utility model is achieved through the following technical solution: a DC emergency lighting power supply circuit, characterized in that it includes:

[0006] The dual power switch is used to automatically switch between the two AC power supplies provided by the mains according to the set working mode;

[0007] The rectifier is used to rectify the AC power output by the dual power switch into DC power and provide it to the output circuit to power the load;

[0008] The battery pack is used to store electrical energy and to supply power to the output circuit to provide emergency power for the load when the mains fails;

[0009] A charger, used to rectify the AC power output by the dual power switch into DC power to charge the battery pack;

[0010] The chopper is used to convert the battery power into a stable DC output when the mains fails;

[0011] Output circuit, used to switch the working mode so that the load can obtain power in both normal power supply and emergency power supply state;

[0012] Local control system, used to locally monitor the operating status of each component;

[0013] Remote control center, used to remotely control the operation of each component;

[0014] The rectifier, charger and chopper all have a redundant design. The dual power supply switching switch is connected to the battery pack through the charger to charge the battery pack. The dual power supply switching switch is connected to the output circuit through the rectifier to supply power to the load to form a normal power supply circuit. The battery pack is connected to the output circuit through the chopper to supply power to the load to form an emergency power supply circuit. The battery pack is directly connected to the output circuit to supply power to the load to form a battery direct supply circuit. The DC power provided by the normal power supply circuit, the emergency power supply circuit and the battery direct supply circuit are all output by the total output switch of the output circuit, and the output circuit has a bypass output switch.

[0015] The utility model fills the gap in the market for DC emergency lighting power supply products and can meet the diverse and high-standard requirements of users. The rectifier, charger and chopper of the utility model all have redundant design and high reliability. The output voltage can be adjusted by the local control system (monitor and main control unit) and can be remotely controlled by the host computer.

[0016] The rectifier of the utility model adopts a high-frequency switching power supply rectifier circuit and is controlled by a local control system.

[0017] The charger of the utility model adopts a high-frequency switching power supply rectification circuit and is controlled by a local control system.

[0018] The chopper of the utility model adopts a high-frequency switch chopper circuit and is controlled by a local control system.

[0019] The output circuit of the utility model is composed of a rectifier output circuit contactor connected to the rectifier, a chopper circuit contactor connected to the chopper, a battery direct supply circuit contactor connected to the battery pack, a total output switch, a bypass output switch and a contactor control circuit.

[0020] Compared with the prior art, the present invention has the following significant effects:

[0021] ⑴This utility model fills the gap of DC emergency lighting power supply products on the market and can meet the diverse and high-standard requirements of users.

[0022] (2) The utility model can provide a stable and controllable DC power supply: the rectifier, charger and chopper all have redundant design and high reliability. The output voltage can be adjusted by the local control system and can be remotely controlled by the host computer.

[0023] ⑶ Traditional lighting loads using AC power require a rectifier AC / DC part + DC / DC part, and the adapter efficiency is low. The lighting load using DC power in this utility model only needs to be configured with a DC / DC part, and the adapter efficiency is high, which is load-friendly and helps to extend the load life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a circuit diagram of the utility model;

[0026] Figure 2 This is a schematic diagram of the connection between the local control system and its components of the utility model. DETAILED DESCRIPTION

[0027] like Figure 1 and Figure 2 As shown, the utility model provides a DC emergency lighting power supply circuit, comprising:

[0028] The dual power switch is used to automatically switch between the two AC power supplies provided by the mains according to the set working mode;

[0029] The rectifier is used to rectify the AC power output by the dual power supply switch into DC power and provide it to the output circuit to power the load. The rectifier uses a high-frequency switching power supply rectifier circuit, and the rectifier's output voltage is set by the local control system (monitor and main control unit). The local control system establishes physical communication with the rectifier's S485 serial communication port via the RS485 serial communication port, using the Modbus-RTU protocol. The PLC sends instructions to each rectifier at a fixed address via a message, and the rectifier executes the commands and operates.

[0030] The battery pack is used to store electrical energy and to supply power to the output circuit to provide emergency power for the load when the mains fails;

[0031] The charger is used to rectify the AC power output by the dual power supply switch into high-quality DC power to charge the battery pack. The charger uses a high-frequency switching power supply rectifier circuit. The charging mode, charging voltage, and current of the charger are automatically set by the local control system according to the program. The local control system establishes physical communication with the charger's S485 serial communication port via the RS485 serial communication port, and the protocol is Modbus-RTU. The PLC sends instructions to each charger at a fixed address via a message, and the charger executes the commands.

[0032] The chopper converts the battery's energy into stable, high-quality DC power in the event of a utility power failure. The chopper's output voltage can be set via the local control system. The chopper utilizes a high-frequency switching chopper circuit. The local control system establishes physical communication with the chopper's RS485 serial communication port using the Modbus-RTU protocol. The PLC sends commands via messages to each chopper at a fixed address, and the chopper executes the commands.

[0033] The output circuit switches operating modes so that the load can receive power in both normal and emergency power supply states. Specifically, it is responsible for switching between the normal power supply circuit, emergency circuit, and battery direct supply circuit to ensure that the load receives power in both normal and emergency power supply states. The output circuit consists of a rectifier output circuit contactor connected to the rectifier, a chopper circuit contactor connected to the chopper, a battery direct supply circuit contactor connected to the battery pack, a main output switch, a bypass output switch, and a contactor control circuit.

[0034] A local control system is used to locally monitor the operating status of each component and ensure efficient operation. This control system is typically located near the monitored circuit and has a direct connection to it. It typically uses sensors and other devices to collect real-time circuit parameters such as voltage, current, and temperature, and performs local control based on pre-set logic. For example, if a circuit temperature is detected to be too high, the local control system can directly activate cooling equipment or adjust the circuit's operating status.

[0035] The remote control center is used to remotely control the operation of various components. It is typically located at a remote control center and connected to the circuit or local control system via a communications network. The host computer primarily presents a software interface, allowing operators to remotely control the circuit using input devices such as a mouse and keyboard, sending control commands to the circuit.

[0036] The dual power supply switch is connected to the battery pack through a charger to charge the battery. The dual power supply switch is connected to the output circuit through a rectifier to supply power to the load, forming a normal power supply circuit. The battery pack is connected to the output circuit through a chopper to supply power to the load, forming an emergency power supply circuit. The battery pack is directly connected to the output circuit to supply power to the load, forming a battery direct supply circuit (in an emergency state, when the chopper fails, the battery direct supply circuit supplies power to the load; when a short circuit occurs in the load circuit, the battery direct supply circuit provides a short-circuit current that can trip the circuit breaker, thereby quickly cutting off the short circuit fault). The DC power provided by the normal power supply circuit, the emergency power supply circuit and the battery direct supply circuit are all output by the total output switch QF4 of the output circuit.

[0037] The rectifiers, chargers, and choppers all feature redundant designs. Redundancy is a design approach used to improve system reliability and stability. Specifically, it involves adding additional resources or functional modules to the system. These redundant components may be idle under normal circumstances, but when a critical component of the system fails, they can promptly replace the failed component and ensure continued normal operation of the system. For example, if the combined power supply of four rectifiers can normally meet the load demand, the design will also add a rectifier set in hot standby mode. If any device fails, the backup rectifier can be immediately switched into operation.

[0038] The above components of the present invention are all existing products.

[0039] The utility model has the following four working modes:

[0040] 1. Normal power supply mode: including monitor & main control unit, dual power switch, rectifier, charger and output circuit (including DC contactor KM1 and main output switch QF4);

[0041] 2. Emergency power supply mode: including local control system, battery pack, chopper and output circuit (including DC contactor KM2 and main output switch QF4);

[0042] 3. Battery direct supply mode: including local control system, battery pack and output circuit (including DC contactor KM3 and main output switch QF4);

[0043] 4. Bypass mode: bypass output switch QF5.

[0044] The local control system of the utility model performs a power-on self-test function when the system is powered on, and detects that the rectifier, chopper, charger and other components have no serious faults or the number of faults does not exceed the set range before normal operation; if there is a serious fault, an alarm prompt is output.

[0045] In the event of a dual power switch failure (mains power outage), the rectifier and charger shut down, the chopper circuit contactor KM2 closes, and the rectifier output circuit contactor KM1 opens, maintaining emergency output. This device reports a serious fault or other related failure. When the mains power is restored, the device automatically returns to the primary power supply state. The switching process takes approximately 100ms.

[0046] The utility model has perfect output circuit short-circuit protection control:

[0047] 1. When the output is short-circuited, the rectifier cannot support the short-circuit current in the normal power supply mode. Close KM2 and open KM1. Use the emergency power supply mode to support the short-circuit current. After the short-circuit fault current is eliminated, reclose KM1 and open KM2 to restore the normal power supply mode.

[0048] 2. When the output is short-circuited, the normal power supply mode + emergency power supply mode cannot support the elimination of the short-circuit current. The battery direct supply mode is used to keep KM2 + KM3 closed and KM1 disconnected at the same time. When the battery supports the elimination of the short-circuit current for about 2 seconds, KM3 is disconnected, KM1 is closed, and then KM2 is disconnected to restore the normal power supply state.

[0049] 3. When the output is short-circuited, the battery direct supply mode cannot support the elimination of the short-circuit current, and KM2 / KM3 will be disconnected (alarm and fault report: prompt "Output short circuit cannot be cleared, be sure to thoroughly check and eliminate the short-circuit point before putting the equipment into operation!"), and then the fault shutdown steady state E4.

[0050] The utility model has an emergency power supply mode: when the battery pack voltage is lower than the termination voltage, an alarm will be issued for the battery pack voltage being lower than the termination voltage fault, prompting the battery pack to shut down for low voltage protection. In an emergency, S8 can be manually switched to the battery direct supply mode, but the battery pack may be discharged and damaged.

[0051] The implementation methods of the present invention are not limited to this. According to the above content of the present invention, in accordance with the common technical knowledge and customary means in this field, without departing from the above basic technical ideas of the present invention, the heat dissipation structure of the present invention also has other implementation methods. Therefore, the present invention can also make other various forms of modifications, replacements or changes, all of which fall within the scope of protection of the present invention.

Claims

1. A DC emergency lighting power supply circuit, characterized in that include: The dual power switch is used to automatically switch between the two AC power supplies provided by the mains according to the set working mode; The rectifier is used to rectify the AC power output by the dual power switch into DC power and provide it to the output circuit to power the load; The battery pack is used to store electrical energy and to supply power to the output circuit to provide emergency power for the load when the mains fails; A charger, used to rectify the AC power output by the dual power switch into DC power to charge the battery pack; The chopper is used to convert the battery power into a stable DC output when the mains fails; Output circuit, used to switch the working mode so that the load can obtain power in both normal power supply and emergency power supply state; Local control system, used to locally monitor the operating status of each component; Remote control center, used to remotely control the operation of each component; The rectifier, charger and chopper all have a redundant design. The dual power supply switching switch is connected to the battery pack through the charger to charge the battery assembly. The dual power supply switching switch is connected to the output circuit through the rectifier to supply power to the load to form a normal power supply circuit. The battery pack is connected to the output circuit through the chopper to supply power to the load to form an emergency power supply circuit. The battery pack is directly connected to the output circuit to supply power to the load to form a battery direct supply circuit. The DC power provided by the normal power supply circuit, the emergency power supply circuit and the battery direct supply circuit is output by the total output switch of the output circuit, and the output circuit has a bypass output switch.

2. The DC emergency lighting power supply circuit according to claim 1, characterized in that: The rectifier adopts a high-frequency switching power supply rectifier circuit and is controlled by a local control system.

3. The DC emergency lighting power supply circuit according to claim 2, characterized in that: The charger adopts a high-frequency switching power supply rectifier circuit and is controlled by a local control system.

4. The DC emergency lighting power supply circuit according to claim 3, characterized in that: The chopper adopts a high-frequency switching chopper circuit and is controlled by a local control system.

5. The DC emergency lighting power supply circuit according to claim 4, characterized in that: The output circuit consists of a rectifier output circuit contactor connected to the rectifier, a chopper circuit contactor connected to the chopper, a battery direct supply circuit contactor connected to the battery pack, a total output switch, a bypass output switch and a contactor control circuit.

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