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What are the components of the DC power supply system
The DC power supply system is mainly composed of two parts: the battery cabinet (battery screen) and the DC screen (DC charging screen). Among them, the DC screen is composed of a high-frequency switching power supply module, a control unit, a step-down silicon chain integrated measurement module, a switching value module, an insulation detection module, a battery inspection module, and a series of AC input, DC voltage display, current display, etc. Unit composition. Now, Zhongruihong Electric will introduce the characteristics of each component separately.
1. Rectifier module
The power rectifier module is a stand-alone module that rectifies AC power to DC power. It is usually rated by the size of the current. Due to the different meter concepts, it can also be divided into: air-cooled module, independent air duct module, self-cooling module, self-energy air-cooling Modules and self-energy and self-cooling modules. It can be used in parallel with multiple units, realizing N1 redundancy. The module output is 110V, 220V stable and adjustable DC voltage. The module itself has various protection functions such as: input overvoltage protection, output overvoltage protection, output current limit protection and output short circuit protection.
2. Monitoring system
The monitoring system is the control and management core of the entire DC system. Its main tasks are: long-term automatic monitoring of various functional units and batteries in the system, acquisition of various operating parameters and status in the system, and timely processing according to the measured data and operating status , And use this as a basis to control the system, realize the automatic management of the power system, and ensure the continuity, reliability and safety of its work. (Zhongruihong monitoring module is divided into intelligent monitoring module and integrated power monitoring module. At present, more intelligent monitoring modules are used)
3. Insulation monitoring unit
The DC system insulation monitoring unit is a device that monitors the insulation of the DC system. It can monitor the resistance of the line to the ground leakage in real time. This value can be set according to the specific situation. When the line-to-ground insulation drops to the set value, an alarm signal will be issued. The DC system insulation monitoring unit currently has bus insulation monitoring and branch insulation monitoring.
4. Battery inspection unit
The battery inspection unit is a device that inspects the online voltage of the battery. The voltage of each battery can be detected in real time. When the voltage of which battery is higher or lower than the setting, an alarm signal will be issued, and the monitoring system can show which battery is faulty. The battery inspection unit is generally capable of detecting 2V-12V batteries and round-robin inspection 1-108 batteries.
5. Switch detection unit
The switch detection unit is a device for online detection of the switch and alarm dry node output. For example, in the whole system, which circuit breaker trips or which fuse is blown, the digital detection unit will send out an alarm signal, and can display which circuit breaker has a fault trip or which fuse is blown through the monitoring system. The device is blown. At present, the switching detection unit can collect 1-108 switching values and multiple passive dry node alarm outputs.
6. Step-down unit
The step-down unit is a step-down voltage stabilizing device, which is the combined bus voltage input step-down unit, and the step-down unit outputs to the control bus, and adjusts the control bus voltage within the set range (110V or 220V). When the combined bus voltage changes, the step-down unit automatically adjusts to ensure the output voltage is stable. The step-down unit is also rated by the size of the output current. There are currently two types of step-down units, one is a step-down silicon chain, and the other is a stepless step-down chopper. The step-down silicon chain has 5 steps and 7 steps, and the voltage adjustment points are all 3.5V, which means that the step-down silicon chain automatically adjusts the stable control bus voltage when the combined bus voltage rises or drops by 3.5V. Stepless step-down chopper is a step-down module, it is smaller than the step-down silicon chain, it has no voltage regulation point, so the output voltage is more stable than the step-down silicon chain, and there are overvoltage, overcurrent, and battery overdischarge. And other functions. However, the current stepless step-down chopper technology is not very mature and often fails, so the step-down silicon chain is still widely used.
7. Power distribution unit
The power distribution unit is mainly the devices used in the DC screen to achieve AC input, DC output, voltage display, current display and other functions, such as power cords, wiring terminals, AC circuit breakers, DC circuit breakers, contactors, lightning protection devices, Shunts, fuses, change-over switches, button switches, indicator lights, current and voltmeters, etc.
The above is the analysis of the components of the DC panel system and the characteristics of each part. I hope to help you learn more about the DC power supply system.