EPC EPC9509 Schnellstart-Handbuch - Seite 4

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QUICK START GUIDE

QUICK START PROCEDURE

The EPC9509 amplifier board is easy to set up and evaluate the

performance of the eGaN FET in a wireless power transfer application.

The EPC9509 can be operated using any one of two alternative methods:

a. Using the pre-regulator

b. Bypassing the pre-regulator

a. Operation using the pre-regulator

The pre-regulator is used to supply power to the amplifier in this

mode and will limit the coil current, power delivered or maximum

supply voltage to the amplifier based on the pre-determined settings.

The main 19 V supply must be capable of delivering 2 ADC. DO NOT

turn up the voltage of this supply when instructed to power up the

board, instead simply turn on the supply. The EPC9509 board includes a

pre-regulator to ensure proper operation of the board including start up.

1. Make sure the entire system is fully assembled prior to making electri-

cal connections and make sure jumper JP1 is installed. Also make sure

the source coil and device coil with load are connected.

2. With power off, connect the main input power supply bus to J1 as

shown in figure 3. Note the polarity of the supply connector.

3. Make sure all instrumentation is connected to the system.

4. Turn on the main supply voltage to the required value (19 V).

5. Once operation has been confirmed, observe the output voltage,

efficiency and other parameters on both the amplifier and device

boards.

6. For shutdown, please follow steps in the reverse order.

b. Operation bypassing the pre-regulator

In this mode, the pre-regulator is bypassed and the main power is

connected directly to the amplifier. This allows the amplifier to be

operated using an external regulator. In this mode there is no protection

for ensuring the correct operating conditions for the eGaN FETs.

When in bypass mode it is crucial to slowly turn up the supply voltage

starting at 0 V. Note that in bypass mode you will be using two supplies;

one for logic and the other for the amplifier power.

1. Make sure the entire system is fully assembled prior to making

electrical connections and make sure jumper JP1 has been removed

and installed in JP50 to disable the pre-regulator and place the

EPC9509 in bypass mode. Also make sure the source coil and device

coil with load are connected.

2. With power off, connect the main input power supply bus +V

bottom pin of JP1 and the ground to the ground connection of J1 as

shown in figure 3.

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3. With power off, connect the control input power supply bus to J1.

Note the polarity of the supply connector. This is used to power the

gate drivers and logic circuits.

4. Make sure all instrumentation is connected to the system.

5. Turn on the control supply – make sure the supply is 19 V range.

6. Turn on the main supply voltage to the required value (it is

recommended to start at 0 V and do not exceed the absolute maximum

voltage of 52 V).

7. Once operation has been confirmed, adjust the main supply voltage

within the operating range and observe the output voltage, efficiency

and other parameters on both the amplifier and device boards.

8. For shutdown, please follow steps in the reverse order. Start by reducing

the main supply voltage to 0 V followed by steps 6 through 2.

NOTE.

1. When measuring the high frequency content switch-node (Source Coil Voltage), care

must be taken to avoid long ground leads. An oscilloscope probe connection (preferred

method) has been built into the board to simplify the measurement of the Source Coil

voltage (shown in Figure 4).

2. To maintain control stability, the red LED for voltage mode indicator on the EPC9509

version 1.0 has been disabled. This will be corrected in subsequent revisions of the

board. For questions regarding this LED function, please contact EPC.

3. AVOID using a Lab Benchtop programmable DC as the load for the device board. These

loads have low control bandwidth and will cause the EPC9509 system to oscillate at a

low frequency and may lead to failure. It is recommended to use a fixed low inductance

resistor as an initial load. Once a design matures, a post regulator, such as a Buck

converter, can be used.

19V

to the

| EPC – EFFICIENT POWER CONVERSION CORPORATION |

Demonstration System EPC9509

3V –

SEPIC

ZVS Class-D

Pre-Regulator

Ampli er

52V

COIL

AMP

Control Reference Signal

Figure 1: Block diagram of the EPC9509 wireless power amplifier

WWW.EPC-CO.COM

Coil

COIL

Combiner

AMP