Adaptive Design of Shante UPS Power Supply for MotorIn some applications which need to ensure the continuous power supply of Shante ups load, sometimes customers will find that UPS frequently appears DCBUS high protection, or negative power protection. Some customers will consider UPS quality problems accordingly. In fact, in most cases, this is due to the phenomenon of motor loads behind. In industrial occasions, motor is a main form of load. When the key link in industrial application must have a high enough level of electrical protection, UPS and motor load coordination is a key factor to consider.
Usually UPS is designed to protect key IT equipment, and its circuit structure is mainly based on the characteristics of IT equipment. For example, at present, switching power supply is mainly used in IT equipment, and the EU regulations stipulate that all equipment above 75W must have power factor correction. Therefore, UPS is mainly faced with a load with power factor correction, which is usually characterized by a constant power load with a power factor close to 1. In terms of high-power electrical equipment, there are some old equipment in use. These equipment are usually based on 6-pulse rectifier or 12-pulse rectifier technology, which is characterized by a constant-power non-linear rectifier load.
Whether it is a switching power supply with PFC or a pulse wave rectifier power supply, the real part of its power can only be positive, and the energy will not be reversed back to the main power supply. Therefore, in UPS planning, more attention is paid to constant power load. Reliability, harmonic control in the presence of non-linear rectifier loads, steady-state voltage accuracy and dynamic recovery speed do not require special ability of energy feedback. Especially after UPS has made a lot of intelligent planning, it often regards the energy from the load as the fault state and processes it back to the DC bus of UPS. Therefore, when using a load similar to that of a motor, the regenerative energy generated by the motor is very simple to trigger the UPS maintenance state.
On the other hand, the common structure of UPS in circuit architecture is rectifier + battery boost + inverter. A large part of UPS rectifier and battery boost components use boost or deformed circuits, and energy can only be obtained from the city. Electricity and batteries are active on DC buses and cannot be reversed. In this way, even if the software promises energy feedback, when energy feedback occurs, the DC bus rises because the energy is stored on the DC bus, which eventually leads to UPS tripping and maintenance.
The load characteristics of Shante UPS power supply motor are totally different from the switching power supply commonly used in IT equipment. It is characterized by many working conditions, such as start/brake, the load after the motor varies greatly, which is completely different from the IT switching power supply. Just load/unload. Therefore, the specific solution also needs to consider the load behind the motor.