The BKF900 series is a modular design with compact structure and convenient installation and debugging. It is suitable for any brand of frequency converter or inverter, and the energy feedback and rectification feedback functions can be interchanged in on-site applications;

The BKF900 series is a new generation of high-quality and versatile energy feedback products designed in a modular manner; Feed back the regenerative energy generated during the process of motor speed regulation to the power grid; Avoiding the energy loss caused by resistance heating using conventional energy consuming braking units, achieving significant energy-saving effects, and also achieving grid connected power generation of wind, solar, and other energy sources.

Elevator energy feedback feeds back the regenerative energy generated during the process of motor speed regulation to the power grid, avoiding the energy loss caused by conventional energy consuming braking units due to resistance heating, thus achieving significant energy-saving effects. It can also achieve grid connected power generation of wind, solar, and other energy sources.

The elevator energy feedback is converted into direct current energy through electric motors and frequency converters, which is consumed by the heating resistor. Usually, the excess mechanical energy (including potential energy and kinetic energy) during the light load up and heavy load down of an elevator can be effectively converted into AC energy by using the elevator energy feedback device to save energy, and then transmitted back to the power grid.

The excess mechanical energy (including potential energy and kinetic energy) during elevator operation is converted into DC electrical energy through traction machines and frequency converters, and stored in capacitors in the DC circuit of the frequency converter. Energy feedback effectively converts the DC electrical energy stored in the capacitors into current, and returns it to the local AC power grid for use by other surrounding electrical equipment, with a power saving rate of up to 15-40%; At the same time, there is no resistance heating element, which reduces the temperature of the computer room, greatly saving the power consumption of the air conditioning and cooling equipment in the computer room.

Energy feedback feeds back the regenerated electrical energy generated during the process of adjusting the speed of mobile phones to the power grid, avoiding the energy loss caused by the resistance heating of conventional energy consuming braking units, thus achieving significant energy-saving effects. It can also achieve grid connected power generation of wind, solar, and other energy sources.

BKF880 energy feedback is suitable for three-phase AC power supply equipment with AC voltage below 660V and 50Hz. It adopts the most advanced military grade high-performance 32-bit DSP digital processing controller with floating point operation, which can quickly detect system voltage, current, power, reactive power and other parameters, and achieve coordinate rotation changes. The control and operation of digital PI regulators and other functions drive the power device (IGBT) of PWM converters, allowing the output energy of the product to flow to the power grid, achieving energy conservation.

BKF880-RF can be used as both a rectifier and an inverter, operating in four quadrant mode. Due to the use of IGBT and SPWM mode, it can control the size and phase of AC power, and make the AC input wave close to sine wave through various filtering and energy storage links in the front end. The power factor is adjustable positive and negative with a midpoint of 1. When the braking energy on the motor side returns through the inverter, the DC bus voltage increases, It can make the phase of the AC input wave opposite to the power supply voltage, achieve regenerative power generation operation, and feed back the regenerative energy to the AC power grid to meet the control requirements of high-performance inverters.

BKBU series uses advanced power technology and high-performance MCU controller,and with a New generation of IFBT power devices combined with research and production of high performance brake products.The product releases the electric energy generated by the motor during the braking process through the power resistance(braking resistance)to generate enough braking torque to keep the frequency converter and other equipment in normal operation.

The BK series DC reactor is used in the DC circuit after rectification. The number of pulses in a rectifier circuit is always limited, and harmonic interference often occurs in the output rectifier voltage. A smoothing reactor is required to suppress it. The converter stations of DC transmission are equipped with smoothing reactors, which make the output DC close to the ideal DC. Flat wave reactors are also indispensable in DC powered thyristor electrical drives. The DC reactor is connected between the DC rectification and inverter links of the frequency converter, which can make the operation of the inverter link more stable and improve the power factor of the frequency converter. Refined from imported cold rolled silicon steel sheets, mainly used to improve input power factor, reduce input high-order harmonics, and reduce external conduction and radiation interference.

BK-JXL series reactors, also known as power coordination reactors, are used to connect in series with the input terminals of fully digital DC speed governors and frequency converters. They are connected between the power supply and frequency converters, and can limit the impact waves caused by grid voltage sudden changes and operating overvoltage, effectively protect the frequency converter, improve the power factor of the frequency converter, and suppress the harmonic current input by the frequency converter into the grid.