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1. A HALF-BRIDGE LLC RESONANT CONVERTER
ADOPTING BOOST PWM CONTROL SCHEME FOR
HOLD-UP STATE OPERATION
ABSTRACT:
The proposed converter is based on a half-bridge LLC resonant converter
structure and a single auxiliary switch is added at the primary side. The converter
has two different operational characteristics. It shows the same operational
characteristic with the conventional LLC resonant converters during nominal state,
which is frequency modulation (FM) method. However, when ac line lost and the
converter enters into the hold-up time state, which requires wide voltage gain
changes, the control method of the proposed converter is changed to the PWM
method using the auxiliary switch. Since the proposed converter compensates wide
voltage gain variation with PWM method of the auxiliary switch rather than
adopting the FM method of main switches, the frequency variation range for the
LLC resonant converter is highly reduced in the proposed converter. Therefore, the
transformer in the proposed converter can be designed at the optimal operating
point and it results in decreased conduction loss of the magnetizing inductor
current. Furthermore, the maximum voltage gain of the proposed converter is

2. easily increased by extending the duty ratio of the auxiliary switch. It helps to
decrease the link capacitance.
BLOCK DIAGRAM:
HARDWARE DIAGRAM:
Dc supply
TOOLS:
1. Orcad/pspice.
2. PIC controller.
3. Matlab/simulation
HB LLC resonant
converter
Driver
circuit
Pulse
generating
unit
T/F
12 v dc
supply
5 v dc
supply
Bridge
Rectifier/filter