Basic Electrical and Electronics Engineering: Unit III: Analog Electronics
Half-Bridge Inverter
Circuit and Waveform diagram, Operation
The circuit consists of SCR's and diodes along with the dc input source. Here an initial assumption is made that the SCR connected in the circuit.
HALF-BRIDGE
INVERTER
The
figure given below shows the circuit representation of a single-phase half-
bridge inverter:
The
circuit consists of SCR's and diodes along with the dc input source. Here an
initial assumption is made that the SCR connected in the circuit conducts only
up to the time of gate pulse is present across it and as soon as the gate pulse
is removed it gets off. For this circuit, considered that at time instant T/2
the gate pulse from one SCR is removed and immediately provided to another SCR
in the given configuration.
Thus,
this makes the two SCR's conduct one after the other and not simultaneously.
Thus,
the whole circuit operation is divided into two periods:
Period
I: 0 d" te" T/2; T1 is conducting
Period
II: T/2 d" te" T; T2 is conducting
At
instant T/2, a gate pulse is removed from T1 and applied to T2.
The figure given below represents the waveform representation of single-phase
half-bridge inverter:
The
circuit operation is such that for a time duration between 0 to T/2, T1
is in conducting state due to the supply input V/2. This allows current Ig1
to flow through the load for this particular condition. Thus, in the
above-given waveform representation, a square wave is shown for the period
between 0 to T/2.
when
at T/2 instant gate pulse is removed from T1 and applied to T2,
the T2 begins to conduct. But this time, the voltage across the load
will be -V/2 due to the lower potential of voltage V/2. In this case, current Ig2
will flow through the load. Thus, for the time duration between T/2 to T,
square wave representation is shown above. For T2 the waveform is in
opposite direction to that of T1 and the reason for this is the
opposite direction of flow of current. Square wave ac output voltage is
obtained. And by varying the time instant for application and removal of gate
pulse the frequency of this ac signal can be varied.
The
operation of a half-bridge inverter makes use of 3 wire dc supply which was a
major drawback hence to overcome this full-bridge inverter was considered.
Basic Electrical and Electronics Engineering: Unit III: Analog Electronics : Tag: : Circuit and Waveform diagram, Operation - Half-Bridge Inverter
Basic Electrical and Electronics Engineering: Unit III: Analog Electronics
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