The role of the elevator inverter components

Capacitor C1:

A snubber capacitor, the rectifier circuit output pulsating DC voltage, must be filtered,

The transformer is a common electrical equipment, can be used to a certain value of the alternating voltage is converted into another value with the frequency of the alternating voltage can be changed and the value of the AC impedance conversion or change the phase.

Varistor:

There are three roles, an over-voltage protection, two lightning-resistant requirements, three safety testing needs.

Thermistor: overheating protection

Hall:

Installed in one of two phases UVW, for detecting the output current. When used motor rated current rated current is about 2 times.

Charging resistor:

Role is to prevent the power switched capacitor instantaneously shorted to ground, burned before starting the storage capacitor capacitance two-terminal voltage of 0V; so the power (power) of the moment capacitance to ground short-circuit condition. If not charge resistor between the rectifier bridge and electrolytic capacitors, the equivalent 380V power supply directly to ground short circuit, instantaneous rectifier bridge through infinite current causes the rectifier bridge blown up. Generally the greater the power elevator inverter, charge resistor is smaller. The choice of the charging resistor is generally :10-300Ω.

Storage capacitor:

Also known as electrolytic capacitors, the main role in the charging circuit for the energy storage and filtering. PN terminal voltage voltage operating range is generally between 430VDC ~ 700VDC, and general high-voltage capacitors are 400VDC or so, in order to meet the need for pressure to be two 400VDC capacitor string together for 800VDC. Capacity choice ≥ 60uf / A

Equalizing Resistance: prevent uneven burn energy storage capacitor voltage energy storage capacitors; electrolytic capacitor can not be made because of two completely consistent, so that each capacitor voltage exposure may differ, withstand voltage, high fever severe (equivalent series resistance capacitor inside) or more pressure values ​​and damage.

C2 capacitor;

Snubber capacitor, the main role is to absorb the IGBT over-current and over-voltage energy.

(2) straight - cross section

VT1-VT6 elevator inverter tube (IGBT insulated gate bipolar power transistor): The main components constituting the elevator inverter circuit, the elevator inverter is the core component. The DC elevator inverter frequency and amplitude are adjustable AC.

VT1-VT6 is the freewheeling diode: the role is to the motor during braking regenerative current return path for providing DC elevator inverter tube VT1-VT6 alternately turned on and off in the commutation process, providing channels.

(3) control parts: power supply board, driver board, control board (CPU board)

Power Board: switching power supply circuit to the control panel, control board, the drive circuit, the detection circuit and fan to provide low-power, low-voltage power supply switching power supply there: ± 5V, ± 15V, ± 24V to the CPU of its subsidiaries circuit, control circuit , display panels to provide power.

Driver board: the CPU is mainly generated by the PWM pulse drive circuit that meets the requirements of the drive signal excitation IGBT output voltage.

Control Board (CPU board): Also called the CPU board rather the human brain, as well as a variety of signal processing control program and other parts.