EPC EPC9113 Краткое руководство по эксплуатации - Страница 3

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QUICK START GUIDE
Table 1: Performance Summary (T
Symbol
Parameter
Bus Input Voltage Range – Pre-
V
Regulator Mode
IN
Amp Input Voltage Range –
V
Bypass Mode
IN
V
Switch-Node Output Voltage
OUT
Switch-Node Output
I
Current (each)
OUT
External Oscillator Input
V
Threshold
extosc
Pre-Regulator Disable
V
Voltage Range
Pre_Disable
Pre-Regulator Disable
I
Current
Pre_Disable
Oscillator Disable
V
Voltage Range
Osc_Disable
Oscillator Disable
I
Current
Osc_Disable
Differential or Single-Select
V
Voltage
sgnDiff
Differential or Single-Select
I
Current
sgnDiff
* Maximum current depends on die temperature – actual maximum current will be subject to switching
frequency, bus voltage and thermals.
Table 2: Performance Summary (T
Symbol
Parameter
V
Output Voltage Range
OUT
I
Output Current Range
OUT
# Actual maximum current subject to operating temperature limits

MECHANICAL ASSEMBLY

The assembly of the EPC9113 Wireless Demonstration kit is simple and
shown in Figure 1. The source coil and amplifier have been equipped
with SMA connectors. The source coil is simply connected to the
amplifier.
The device board does not need to be mechanically attached to the
source coil.
The coil sets of the EPC9111 and EPC9112 (both the source and
device coils) are not compatible with the EPC9113/4 kit. To prevent
inadvertent connection of either, the connectors of the amplifier and
coils have been changed from reverse polarity to standard polarity.
Please contact EPC for modifications to the original coil set to ensure
compatibility with the EPC9509 amplifier.

DETAILED DESCRIPTION

The Amplifier Board (EPC9509)
Figure 2 shows the system block diagram of the EPC9509 ZVS class-D
amplifier with pre-regulator and Figure 3 shows the details of the
ZVS class-D amplifier section. The pre-regulator is used to control
the ZVS class-D wireless power amplifier based on three feedback
parameters 1) the magnitude of the coil current indicated by the
green LED, 2) the DC power drawn by the amplifier indicated by
EPC – EFFICIENT POWER CONVERSION CORPORATION |
= 25°C) EPC9509
A
Conditions
Min
Max
Also used in
bypass mode
17
24
for logic supply
0
52
52
1*
Input 'Low'
-0.3
0.8
Input 'High'
2.4
5
Floating
-0.3
5.5
Floating
-10
10
Open Drain/
-0.3
5
Collector
Open Drain/
-25
25
Collector
Open Drain/
-0.3
5.5
Collector
Open Drain/
-1
1
Collector
= 25 °C) Category 3 Device Board
A
Conditions
Min
Max
0
38
0
1.5#
WWW.EPC-CO.COM
the yellow LED and 3) a maximum supply voltage to the amplifier
indicated by the red LED. Only one parameter at any time is used to
Units
control the pre-regulator with the highest priority being the maximum
voltage supplied to the amplifier followed by the power delivered
V
to the amplifier and lastly the magnitude of the coil current. The
maximum amplifier supply voltage is pre-set to 52 V and the maximum
V
power drawn by the amplifier is pre-set to 16 W. The coil current
V
magnitude is pre-set to 800 mA
using P25. The pre-regulator comprises a SEPIC converter that can
A
operate at full power from 17 V through 24 V.
V
The pre-regulator can be bypassed by connecting the positive supply
V
directly to the ZVS class-D amplifier supply after removing the jumper
V
at location JP1 and connecting the main positive supply to the bottom
pin. JP1 can also be removed and replaced with a DC ammeter to directly
mA
measure the current drawn by the amplifier. When doing this observe
V
a low impedance connection to ensure continued stable operation of
the controller. Together with the Kelvin voltage probes (TP1 and TP2)
mA
connected to the amplifier supply, an accurate measurement of the
V
power drawn by the amplifier can be made.
mA
The EPC9509 is also provided with a miniature high efficiency switch-
mode 5 V supply to power the logic circuits on board such as the gate
drivers and oscillator.
The amplifier comes with its own low supply current oscillator that is
pre-programmed to 6.78 MHz ± 678 Hz. It can be disabled by placing
Units
a jumper into JP70 or can be externally shutdown using an externally
V
controlled open collector / drain transistor on the terminals of JP70 (note
A
which is the ground connection). The switch needs to be capable of
sinking at least 25 mA. An external oscillator can be used instead of the
internal oscillator when connected to J70 (note which is the ground
connection) and the jumper (JP71) is removed.
The pre-regulator can also be disabled in a similar manner as the oscillator
using JP50. However, note that this connection is floating with respect to
the ground so removing the jumper for external connection requires a
floating switch to correctly control this function. Refer to the datasheet of
the controller IC and the schematic in this QSG for specific details.
The ZVS timing adjust circuits for the ZVS class D amplifiers are each
independently settable to ensure highest possible efficiency setting
and includes separate ZVS tank circuits. This allows OOK modulation
capability for the amplifier.
The EPC9509 is provided with 3 LED's that indicate the mode of
operation of the system. If the system is operating in coil current limit
mode, then the green LED will illuminate. For power limit mode, the
yellow LED will illuminate. Finally, when the pre-regulator reaches
maximum output voltage the red LED will illuminate indicating that
the system is no longer A4WP compliant as the load impedance is too
high for the amplifier to drive. When the load impedance is too high
to reach power limit or voltage limit mode, then the current limit LED
will illuminate incorrectly indicating current limit mode. This mode
also falls outside the A4WP standard and by measuring the amplifier
supply voltage across TP1 and TP2 will show that it has nearly reach the
maximum value limit.
| COPYRIGHT 2017 |
Demonstration System EPC9113
but can be made adjustable
RMS
| 3