Boost Chopper circuit simulation based on Multisim

with the rapid development of power electronics technology, high voltage switching power supply has been widely used in computer, communications, industrial processing and aerospace and other fields. All power equipment requires good and stable power supply, while the external energy supply is mostly AC, and the power supply is responsible for the various types of DC tasks required to convert AC power to electronic devices. However, sometimes the DC voltage supply does not meet the requirements of the equipment, still need to transform, known as DC-to transformation . DC Chopper Circuit as a direct current to another fixed voltage DC-DC converter, in the DC drive system, rechargeable storage circuit, switching power supply, power electronic conversion device and a variety of electrical equipment to get common application. There are many kinds of transformation circuits, such as Buck Chopper Circuit, boost chopper circuit, lifting and chopping circuit, compound chopper circuit and so on. DC Chopper technology has been widely used in switching power supply and DC motor drive, so that its control to achieve accelerated stability, rapid response, saving power. The full-control power electronic device IGBT has been widely used in the field of power transmission and transformation, active filter energy of traction Electric drive. However, the DC chopper circuit with IGBT as power device needs to pay attention to the following problems in practical application: (1) The question of system loss, (2) Gate resistance, (3) The driving circuit realizes over-flow voltage protection.

the DC chopper circuit actually uses PWM technology, which cuts the DC voltage into a series of pulses and changes the duty ratio of the pulses to obtain the desired output voltage. PWM control mode is the most widely used control mode, it has good adjustment characteristics. With the development of electronic technology, a variety of integrated control chips have been developed in recent years, which can work with only a small number of components, which not only simplifies the design, but also significantly reduces component count, wiring and solder joints.

The simulation circuit based on Multisim is as follows

Wherein, u0/us=1/1-d (U0 is the output voltage, Us is the input voltage, D is the duty ratio)

If the duty ratio is 1/3, the theoretical output voltage is u0=24/(1-1/3) =36v

Observe the oscilloscope to see that the output voltage is close to 36v and stable

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Boost Chopper circuit simulation based on Multisim