EPC EPC9508 Краткое руководство по эксплуатации - Страница 4

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QUICK START GUIDE

QUICK START PROCEDURE

The EPC9508 demonstration system is easy to set up and evaluate the

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

The EPC9508 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 current based on the setting. The pre-regulator also

monitors the temperature of the amplifier and will limit the current in the

event the temperature exceeds 85°C.

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

trical connections and make sure jumper (JP60 is set to pre-regulator

– right 2 pins).

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

(J50). Note the polarity of the supply connector.

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

(J90). Note the polarity of the supply connector.

4. Select and connect an applicable load resistance to the device board.

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

6. Turn on the control supply – make sure the supply is between 7 V and

12 V (7.5 V is recommended).

7. Turn on the main supply voltage to the required value (it is recom-

mended to start at 8 V and do not exceed the absolute maximum volt-

age of 36 V).

8. 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.

9. For shutdown, please follow steps in the reverse order. Start by reduc-

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

b. Operation bypassing the pre-regulator

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

nected directly to the amplifier. This allows the amplifier to be operated

using an external regulator or to test at higher voltages.

In this mode there is no current or thermal protection for the eGaN FETs.

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

electrical connections and remove the jumper JP60. Never connect the

main power positive (+) to J50 when operating in bypass mode.

2. With power off, connect the main input power supply ground to the

ground terminal of J50 (-) and the positive (+) to the left-side pin

of JP60.

EPC – EFFICIENT POWER CONVERSION CORPORATION |

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

(J90). Note the polarity of the supply connector.

4. Select and connect an applicable load resistance to the device board.

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

6. Turn on the control supply – make sure the supply is between 7 V and

12 V range (7.5 V is recommended).

7. Turn on the main supply voltage to the required value (it is recom-

mended to start at 2 V and do not exceed the absolute maximum

voltage of 52 V).

8. Once operation has been confirmed, adjust the main supply volt-

age within the operating range and observe the output voltage,

efficiency and other parameters on both the amplifier and device

boards. See Pre-Cautions when operating in the bypass mode

9. 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. 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 (J2 and J3 as shown in Figure 4).

THERMAL CONSIDERATIONS

The EPC9508 demonstration system showcases the EPC8009

eGaN FET in a wireless energy transfer application. Although the

electrical performance surpasses that of traditional silicon devices,

their relatively smaller size does magnify the thermal management

requirements. The operator must observe the temperature of the gate

driver and eGaN FETs to ensure that both are operating within the

thermal limits as per the datasheets.

NOTE. The EPC9506 / EPC9507 demonstration system has limited current and thermal pro-

tection only when operating off the Pre-Regulator. When bypassing the pre-regulator there

is no current or thermal protection on board and care must be exercised not to over-current

or over-temperature the devices. Wide coil coupling and load range variations can lead to

increased losses in the devices.

Pre-Cautions

The EPC9508 demonstration system has no controller or enhanced

protections systems and therefore should be operated with caution.

Some specific precautions are:

1. Please contact EPC at [email protected] should the tuning of the coil be

required to change to suit specific conditions so that it can be correctly

adjusted for use with the ZVS Class-D amplifier.

2. There is no heat-sink on the devices and during experimental evalua-

tion it is possible present conditions to the amplifier that may cause

the devices to overheat. Always check operating conditions and

monitor the temperature of the EPC devices using an IR camera.

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Demonstration System EPC9508

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