The Hall current sensor 1 sends a signal and feeds back to control the firing angle of the thyristor, the signal sent by the current sensor 2 controls the inverter, and the sensor 3 controls the float charge source. Control with Hall current sensor to ensure normal operation of inverter power supply. Due to its fast response speed, it is particularly suitable for uninterruptible power supplies in computers.
â—† Application of uninterruptible power supply (UPS)
Ensuring the normal power supply in any situation is an important foundation for the safe work of electronic equipment in many industries. To this end, in addition to the normal power supply of the industrial grid, a UPS power supply system is also required. UPS power supply is an important device to ensure the stability and continuity of power supply. Its mainframe has a high degree of intelligence, and the energy storage equipment uses maintenance-free batteries. Although the models and system capacities of UPS power supply systems configured by various enterprises are different, the principles and main functions are basically the same. In the selection of UPS power supply type, the online type is selected. This is because the online UPS power system has zero-time switching of external equipment power supply, the length of its own power supply time is optional, and has the characteristics of voltage regulation, frequency stability, and purification.
â—† Composition and basic principle of UPS power system
The UPS power system consists of 4 parts: rectification, energy storage, conversion and switch control. The voltage stabilizing function of its system is usually completed by a rectifier. The rectifying device uses a thyristor or a high-frequency switching rectifier. It has the function of controlling the output amplitude according to the change of external power, so that when the external power changes (the change should meet the system Requirement), the rectified voltage with basically unchanged output amplitude. The purification function is completed by the energy storage battery. Since the rectifier can not eliminate the transient pulse interference, the rectified voltage still has interference pulses. In addition to the function of storing DC direct energy, the energy storage battery is like a large-capacity capacitor connected to the rectifier, and its equivalent electrical capacity is proportional to the capacity of the energy storage battery. When the commercial power supply is normal at 380Vac, the DC main circuit has a DC voltage, which is supplied to the DC-AC AC inverter to output a stable 220Vac AC voltage, and the commercial power charges the current. When the mains is undervoltage or suddenly loses power at any time, the battery pack feeds power to the DC loop through the isolation diode switch. There is no switching time from grid power supply to battery power supply. When the battery energy is about to be exhausted, the uninterruptible power supply will give an audible and visual alarm, and the inverter will stop working at the lower limit of the battery discharge, and a long alarm will sound. The uninterruptible power supply also has an overload protection function. When an overload occurs (150% load), it jumps to the bypass state and automatically returns when the load is normal. When a severe overload occurs (more than 200% of the rated load), the uninterruptible power supply immediately stops the inverter output and jumps to the bypass state. At this time, the front air switch may also trip. After the fault is eliminated, as long as the switch is closed, restart the work and resume work.
â—† Application of current sensor in UPS
The Hall current sensor 1 sends a signal and feeds back to control the firing angle of the thyristor, the signal sent by the current sensor 2 controls the inverter, and the sensor 3 controls the float charge source. Control with Hall current sensor to ensure normal operation of inverter power supply. Due to its fast response speed, it is particularly suitable for uninterruptible power supplies in computers.
The closed-loop current sensor measures current based on the Hall effect and the principle of zero magnetic field balance (feedback system). The internal magnetic field of the sensor is always controlled at the zero point. The current used to balance the zero magnetic field is the primary current flowing through the conductor multiplied by the proportional coefficient of the primary coil. The closed-loop current is the output of the sensor. It reflects the change of the primary current according to the attenuation of the secondary coil turns at any time. The current output can be converted to a voltage output through an external resistor.
â—† Features of closed-loop current sensor
The highest measurement current can reach 2000A; can measure AC, DC and pulse current; the highest signal-to-price ratio; fast response, no overshoot; high load capacity; high-performance circuit isolation between primary and secondary; small size and light weight
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