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The circuit shown below is initially relaxed. With switch closed at t = 0, the conduction time of diode is around
For the series RLC diode circuit, the current i(t) is given by
The diode will stop conducting when ωr t1 = π.
∴ Conduction time of diode,
The effect of using freewheeling diode are:
1. the load performance is improved.
2. the system efficiency is improved.
3. it prevents the output voltage from becoming negative.
Choose the correct code from the given options,
A single-phase 230 V, 1 kW heater is connected across single-phase 230 V, 50 Hz supply through a diode as shown in figure. The power delivered to the heater element is
The rms value of output voltage is:
∴ Power absorbed by heater element
A single-phase full-bridge diode rectifier delivers a load current of 10 A, which is ripple free. The rms and average values of diode currents are respectively
Given, I0 = 10A
The rms value of diode current,
The average value of diode current,
In the circuit shown below, the diode states at the extremely large negative value of the input voltage vi are
If vi is of very large negative value Ivi| > |E|, then diode D1 will be forward biased (ON) while diode D2 will be reverse biased (OFF).
A single-phase full-bridge diode rectifier delivers a constant load current of 20 A. The rms and average values of source current are respectively
A diode whose internal resistance is 20 Q is to supply power to a 1 kΩ load from a 230 V (rms) source of supply as shown in figure below. The percentage regulation from no load to the given load is
∴ Voltage regulation
Assertion (A): A single-phase half-wave rectifier circuit is popularly known as one-pulse rectifier.
Reason (R) : A single-phase half-wave rectifier circuit is used to convert ac power to dc.
A single-phase half-wave rectifier is popularly known as one-pulse converter because for one cycle of supply voltage, there is one half-cycle of output, or load voltage. Hence, both assertion and reason are true but reason is not the correct explanation of assertion.
Assertion (A) : In 3-phase converters, the ripple frequency of the converter output voltage is higher than in single phase converter.
Reason (R) : The load current is mostly discontinuous in 3-phase converters.
The load current is mostly continuous in 3-phase converters. Hence reason is a false statement.
Assertion (A) : In a half-wave rectifier with R-L load and with freewheeling diode, the input Volt- Ampere demand is less.
Reason (R) : With freewheeling diode, the stored energy is in the load itself.