What is the use of chopper circuit?
Basic Chopper Circuit details The solid-state (switching) devices such as BJT, SCR or GTO can be used as a series switch S. Usually the load is inductive, therefore, a freewheeling diode D is connected across the inductive load for free circulation of load current when the switching device is turned OFF.
Which type of semiconductor device is used as switch in the DC chopper circuit?
Devices used in Chopper Low power application: GTO, IGBT, Power BJT, Power MOSFET etc. High power application: Thyristor or SCR. These devices are represented as a switch in a dotted box for simplicity.
What is the chopping frequency?
The chopping frequency is usually between a few hundred Hz and several kHz, and it should be noted that because this is a sampling system, the input frequency must be much less than one-half the chopping frequency in order to prevent errors due to aliasing.
What is a DC chopper or DC DC converter?
A dc‐to‐dc converter, also known as dc chopper, is a static device which is used to obtain a variable dc voltage from a constant dc voltage source. Choppers are widely used in trolley cars, battery operated vehicles, traction motor control, control of large number of dc motors, etc…..
What is the advantage of DC chopper?
DC chopper device has the advantages of high efficiency, flexibility in control, light weight, small size, quick response and regeneration down to very low speed.
What are the advantages of DC choppers?
Advantages of dc chopper
- High efficiency.
- Regeneration.
- Flexibility in control.
- Lightweight.
- Small size.
- Quick response.
- Fast dynamic response.
- Smooth acceleration.
Which device is used in a chopper circuit?
4. Which device can be used in a chopper circuit? Explanation: All of the devices which can be used as a switch can be used in a chopper. Explanation: It is a high speed on/off semiconductor switch.
What are the disadvantages of DC chopper?
Drawbacks or disadvantages of DC-DC converter ➨They are expensive. ➨Choppers are inadequate due to unsteady voltage and current supply. ➨Disadvantages of fly-back type: More EMI due to gap, More ripple current, More input/output capacitance, higher losses etc.
What are the advantages of DC chopper?
Why forced commutation is used in DC chopper?
A forced commutation chopper control for regulating speed of a DC series tractive motor limits peak motor current by sensing the voltage across the commutation capacitor during the on-time of the current pulses and gating the commutation SCR on in response to a predetermined magnitude of sensed voltage to thereby …
What is current commutation?
In current commutated chopper , as the name suggests, chopper is commutated by current pulse. • In this process, a current pulse is made to flow in the reverse direction through the conducting thyristor and when the net thyristor current becomes zero, it is turned off.
Which device can be used in a chopper circuit?
Which device can be used in a chopper circuit? Explanation: All of the devices which can be used as a switch can be used in a chopper. Explanation: It is a high speed on/off semiconductor switch. Note that it behaves like a DC transformer, does not mean it is a DC transformer.
What is A commutation circuit?
Commutation means transfer of current from one circuit to another.
What is a chopper circuit?
Chopper circuits are known as DC to DC converters. Similar to the transformers of the AC circuit, choppers are used to step up and step down the DC power. They change the fixed DC power to variable DC power.
What is a DC chopper used for?
DC Chopper. A DC chopper is a static device that converts fixed dc input voltage to a variable dc output voltage directly. A chopper can be said as dc equivalent of an ac transformer as they behave in an identical manner. This kind of choppers are more efficient as they involve one stage conversion.
What is a chopper converter?
A chopper is basically a dc to dc converter whose main function/usage is to create adjustable dc voltage from fixed dc voltage sources through the use of semiconductors. The main classification of the types of choppers is given in another post. Take a look – TYPES OF CHOPPER CIRCUITS There are two types of choppers – AC and DC.
What are the different types of choppers in power system?
There are two types of choppers – AC and DC. In the case of an ac link chopper, first dc is converted to ac with the help of an inverter. After that, AC is stepped-up or stepped-down by a transformer, which is then converted back to dc by a diode rectifier.