DC Chopper vs AC Link Chopper

<p>Current limit control and time ratio control (B)</p> Signup and view all the answers

<p>Both can step up or step down a voltage level. (B)</p> Signup and view all the answers

<p>It indicates that the device operates without any mechanical parts. (C)</p> Signup and view all the answers

<p>Higher cost and reduced efficiency. (D)</p> Signup and view all the answers

<p>The average value of the output voltage can be altered under control strategies. (A)</p> Signup and view all the answers

<p>To step up or step down the AC signal voltage. (C)</p> Signup and view all the answers

<p>The ratio of ON time to total time. (C)</p> Signup and view all the answers

<p>Pulse Width Modulation (PWM) (C)</p> Signup and view all the answers

<p>Load current may become irregular due to high OFF times. (C)</p> Signup and view all the answers

<p>It turns the converter ON and OFF to keep current between limits. (A)</p> Signup and view all the answers

<p>The main thyristor TM becomes reverse biased. (B)</p> Signup and view all the answers

<p>They apply a large reverse voltage to commutate the thyristor. (C)</p> Signup and view all the answers

<p>At t1/2 of the time period. (B)</p> Signup and view all the answers

<p>It uses external components to turn off the thyristor. (B)</p> Signup and view all the answers

<p>Conduction stops when load current reaches zero. (A)</p> Signup and view all the answers

<p>2 Vdc (D)</p> Signup and view all the answers

<p>Vc equals 0. (B)</p> Signup and view all the answers

<p>It requires varying the ON time while keeping frequency constant. (C)</p> Signup and view all the answers

<p>Diode (B)</p> Signup and view all the answers

<p>Diode D (B)</p> Signup and view all the answers

<p>The ON time is varied in relation to total time. (C)</p> Signup and view all the answers

<p>It decreases the output voltage. (C)</p> Signup and view all the answers

<p>It decreases from 2 Vdc to Vdc. (C)</p> Signup and view all the answers

<p>To control the power flow in an AC circuit. (A)</p> Signup and view all the answers

<p>The capacitor voltage turns off the main thyristor. (A)</p> Signup and view all the answers

<p>Jones chopper (D)</p> Signup and view all the answers

<p>DC choppers provide single-stage conversion. (D)</p> Signup and view all the answers

<p>To convert variable AC voltage back to fixed DC. (C)</p> Signup and view all the answers

<p>The output voltage is varied by adjusting the time the switch is ON. (D)</p> Signup and view all the answers

<p>By modifying the duty cycle of the switching element. (D)</p> Signup and view all the answers

<p>It involves multiple conversion stages requiring more components. (B)</p> Signup and view all the answers

<p>They depend on variable DC voltage outputs for operation. (A)</p> Signup and view all the answers

<p>Loss of energy due to heat during operation. (D)</p> Signup and view all the answers

<p>It can function without any moving parts. (C)</p> Signup and view all the answers

<p>It can be modified according to load requirements. (D)</p> Signup and view all the answers

<p>The current is regulated between specified upper and lower limits. (B)</p> Signup and view all the answers

<p>It occurs when load current reduces to zero or shifts to another device. (A)</p> Signup and view all the answers

<p>Large reverse voltage is applied to turn off the conducting thyristor. (A)</p> Signup and view all the answers

<p>Designing filters for wide frequency ranges is complex. (C)</p> Signup and view all the answers

<p>PWM simplifies the design of output filters. (B)</p> Signup and view all the answers

<p>It must be charged to the supply input with matching polarity. (C)</p> Signup and view all the answers

<p>The frequency change may interfere with other systems. (D)</p> Signup and view all the answers

<p>It begins to freewheel through the diode and decreases exponentially. (A)</p> Signup and view all the answers

<p>A freewheeling diode (B)</p> Signup and view all the answers

<p>Forced commutation utilizes external components for thyristor turn-off. (D)</p> Signup and view all the answers

<p>TM becomes reverse biased and enters a non-conducting state. (B)</p> Signup and view all the answers

<p>From when the capacitor voltage equals the supply voltage to when it becomes zero. (B)</p> Signup and view all the answers

<p>Step-up choppers regulate the output voltage higher than input by controlling duty cycle. (C)</p> Signup and view all the answers

<p>V0 changes from a maximum of 2Vdc to Vdc as the capacitor discharges. (D)</p> Signup and view all the answers

<p>The discharging capacitor now configured in series with TA. (D)</p> Signup and view all the answers

<p>It is responsible for turning off the main thyristor TM. (A)</p> Signup and view all the answers

<p>TA is reverse biased and stops conducting. (A)</p> Signup and view all the answers

<p>It maintains the voltage –Vs constant during operation. (A)</p> Signup and view all the answers

<p>AC choppers manage power in AC circuits whereas step-up choppers are designed for increasing DC voltage. (C)</p> Signup and view all the answers

Electronic circuits that convert a fixed DC voltage to a variable DC voltage.

A device that converts a fixed DC voltage to a variable DC voltage.

A two-stage DC-to-DC converter that first converts DC to AC, then AC to DC, using an inverter and transformer.

A one-stage DC-to-DC converter that directly converts fixed DC to variable DC.

A method used to control the output voltage of a DC chopper by changing the on-time of the switching device.

Method for controlling output current of a DC chopper.

For supplying devices requiring variable DC voltages when fixed DC power sources are present.

A device that performs power conversion without any moving parts.

A DC voltage source with a constant voltage level.

A DC voltage source with a voltage level that can be adjusted.

A DC chopper control method that varies the duty cycle (TON/T) to adjust output voltage.

A type of time ratio control where the frequency remains constant, and the 'on' time (duty cycle) is adjusted.

A type of time ratio control where the frequency is adjusted, changing the time period (T).

A DC-DC converter control method that maintains current within predefined upper and lower limits.

A chopper circuit that turns off a thyristor using a large reverse voltage.

Turning off a thyristor that is in conducting state.

Turning off a thyristor using external components (like inductors and capacitors).

A type of forced commutation using reverse voltage across the thyristor.

Thyristor turns off when load current reaches zero or transfers to another device.

The ratio of 'on' time (TON) to the total time period (T) in a chopper circuit.

A type of DC chopper where the thyristor is turned off by controlling the voltage across it.

Capacitor charging in a circuit can be done either through a supply voltage (direct charging) or through an auxiliary thyristor (indirect charging).

Chopper circuits control the flow of DC current by switching it on and off.

A DC chopper that increases the output voltage.

A DC chopper that decreases the output voltage.

A device that controls power flow in an AC circuit.

A likely application-specific chopper type, requiring more context.

The current flowing through the load in a chopper circuit.

The current flowing through the auxiliary components during commutation.

The process of turning off a thyristor by using an auxiliary circuit.

A circuit that converts fixed DC voltage to adjustable DC voltage, also known as a DC-to-DC converter.

A two-stage DC-to-DC converter that converts DC to AC, steps it up/down using a transformer, then converts back to DC.

A single-stage DC-to-DC converter that directly converts fixed DC to adjustable DC voltage.

To provide variable DC voltage to devices when a fixed DC power source is available.

DC chopper control method that adjusts output voltage by altering the 'on' time of the switching device (duty cycle).

The ratio of the on-time to the total time period in a chopper circuit.

DC chopper control method that maintains output current inside specific upper and lower limits.

A DC voltage source with a constant voltage level.

A DC voltage source whose level can be adjusted.

A device that performs power conversion without any moving parts.

Method of controlling DC chopper output voltage by adjusting the on-time (duty cycle).

Time ratio control method where frequency stays the same; on-time (TON) is varied.

Time ratio control changing frequency, and thus the time period (T).

DC-DC converter control maintaining current within upper and lower limits.

Chopper circuit turning off a thyristor using a large reverse voltage.

Process of turning a thyristor from 'on' to 'off' state.

Using external components to turn off a thyristor.

Ratio of 'on' time (TON) to total time period (T) in a chopper circuit.

Thyristor turns off due to load current changes or transfer to another device.

Provide varying DC voltage from a fixed DC input.

A type of DC chopper that uses a capacitor to turn off the main thyristor.

Capacitors can be charged in a circuit directly by a supply voltage or indirectly by an auxiliary thyristor.

The current flowing through the auxiliary circuit during the turn-off of the main thyristor.

The current flowing through the load in the chopper circuit.

A DC chopper that increases the output voltage to a higher value than the input voltage.

A DC chopper that decreases the output voltage to a lower value than the input voltage.

A device that controls power flow in an AC circuit.

A type of chopper, possibly specific to a certain application; more context is needed.

The process of switching off a thyristor (or a similar device).

Switching off a thyristor controlled by changing the voltage across it.