- ページ 10
マザーボード EPC 9104のPDF クイック・スタート・マニュアルをオンラインで閲覧またはダウンロードできます。EPC 9104 12 ページ。 15 w, 6.78 mhz class d wireless power system using the epc2014 egan fet
ページを印刷するQUICK START PROCEDURE
b. Operation using an external oscillator
Using an external oscillator allows the user to specify an operating
frequency. The external oscillator voltage may be pure AC (sine or
square wave) or have a DC o set (see Table 1 for voltage limits).
1. Prior to commencing with testing, jumper (J61) will need to
be moved from its 1-2 position (default) to position 2-3.
2. Using this method, it is not necessary to connect the source
coil feedback voltage RF cable between the source coil and
the source board
3. Make sure the entire system is fully assembled prior to making
electrical connections.
4. With power o , connect the main input power supply bus to
+V
(J62). Note the polarity of the supply connector.
IN
5. With power o , connect the control input power supply bus
to +V
(J90). Note the polarity of the supply connector.
DD
6. Set the load to the desired value (see table for setting jumpers
or use an appropriate external load).
7. Turn on the control supply – make sure the supply is between
7 V and 12 V range (8.5 V is recommended).
8. Turn on the main supply voltage starting at 0 V and increase
slowly to the required value (do not exceed the absolute
maximum voltage of 24 V on V
operates.
10
). Observe that the system
OUT
EPC
EFFICIENT POWER CONVERSION
* Can only be used if heat-sink has been removed and post has been installed
Figure 7: Proper Measurement of Switch Node using the hole and post
Device
Coil
Output
t
Switch-
-
Node
e
0
0
0
Source
e
e
Coil
l
l
Input
t
t
Current
t
0
0
0 0
Lower
r
r
Gate
e
Figure 8: Typical Waveforms for V
CH1: (V
) Device Coil Output Voltage – CH2: (V
OUT
CH3: (V
) Switch node voltage – CH4: (I
OUT
www.epc-co.com
Do not use
probe ground
lead
Ground probe
against post
Place probe tip
Minimize loop
in large via
= 24 V (6.639 MHz) into 23 load
IN
_
) Lower FET Gate Voltage
GS
L
) Source Coil Current
OUT
15