Explanation of power terms related to UPS power supply (3)

Explanation of power terms related to UPS power supply (3)

Power factor: For a device, there are two different parameters: input power factor and output power factor. The value of power factor is between 0 and 1. It is between W (active power) and VA (apparent power). ratio. The higher the input power factor, the higher the utilization efficiency of the UPS to the power grid, and the power factor of the energy-saving UPS is above 0.9. Considering the output end, the higher the output power factor, the stronger the load capacity of the UPS, and the lower the output power factor, the weaker the load capacity of the UPS.

Power factor correction: It is a means to improve the input power factor of electronic equipment. After the UPS is equipped with a power factor correction circuit, its input power factor can be greatly improved.

National standard socket: Chinese standard socket form, the neutral wire and the live wire are arranged in the shape of \/, and the ground wire is at the head of \/.

American standard socket: American standard socket form, the neutral wire and the live wire are arranged in the shape of 11, and the ground wire is at the beginning of the 11.

Common Mode: Refers to a way in which noise flows. Any noise originating from the power hot (HOT) or neutral (NEUTRAL) and returning through the ground is called common mode noise.

Silicon barrier diode: a diode designed with silicon (AILICON) as the main raw material. The difference between silicon barrier diodes and general diodes is that when the voltage exceeds its designed rated voltage, the bipolar body produces a potential barrier effect (AVALANCHEEFFECT) and turns on, so silicon barrier diodes are often used as Zener diodes.

Fault current: refers to the abnormal current flowing in the line.

"Three remotes": remote signaling, telemetry, and remote control. Refers to remote monitoring of equipment.

Isolation: The grid uses the live and neutral wires to transmit power, so external lightning strikes can damage the electronics inside the appliance through the live and neutral wires. Therefore, many UPS or electrical equipment are equipped with transformers on both the output and input side to electrically isolate the equipment from the grid to solve the above problems and reduce noise*.

High-frequency machine: Using high-frequency switching technology, high-frequency switching elements are used to replace the UPS of the bulky power frequency transformer in the rectifier and inverter, commonly known as high-frequency machine. The high-frequency machine is small in size and high in efficiency.

Power frequency machine: UPS with power frequency transformer as rectifier and inverter components, commonly known as power frequency machine. The main features are that the main power components are stable and reliable, with strong overload capacity and strong impact resistance.

Management information base: a software module used to support SNMP network devices, and store the status information of network devices for the network management system or users to query the device status.

Interaction: A working mode of UPS, the basic structure consists of bidirectional inverter, battery and switch. When the grid fails, the inverter supplies power to the load, and when the grid is normal, the inverter turns to charge the battery. Interactive UPS has powerful charging function, but the output has switching time.

Backup type: A working mode of UPS, the basic structure consists of inverter, battery pack and switch. When the grid is normal, the inverter stops outputting AC power, and the AC power from the grid supplies power to the load through the UPS. When the power grid fails (power failure, undervoltage, overvoltage, etc.), the UPS switches to the inverter output mode through the switch. The switching time of this conversion process is 3-10ms.