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6 | | EPC – EFFICIENT POWER CONVERSION CORPORATION |
| COPYRIGHT 2017
Demonstration System EPC9113
Source Coil
Coil
Connection
Matching
Impedance
Network
Class 3
Coil
Figure 5: Basic schematic of the A4WP Category 3 device board
Figure 3: Diagram of EPC9509 amplifier circuit
Figure 2: Block diagram of the EPC9509 wireless power amplifier
+
V
AMP
Q
1_a
L
ZVS12
Q
2_a
Q
1_b
Q
2_b
L
ZVS2
C
ZVS2
C
ZVS1
L
ZVS1
Coil
Connection
Single
Ended
Operation
Jumper
Pre-
Regulator
Pre-Regulator
Jumper
JP1
J1
V
IN
Bypass Mode
Connection
Un-Regulated
DC output
Matching
Impedance
Network
Cat. 3
Coil
Device Board
X
I
AMP
P
AMP
V
AMP
I
COIL
|
I
COIL
|
19V
SEPIC
Pre-Regulator
ZVS Class-D
Amplifier
Control Reference Signal
Combiner
DC
C
Coil
S
3V –
DC
52V
DC
Figure 4: Basic schematic of the A4WP Class 3 source coil