EPC EPC9129 Manual de inicio rápido - Página 6

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QUICK START GUIDE

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

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

shown in figure 8.

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 80 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 11).

2. AVOID using a Lab Benchtop programmable DC as the load for the category 3 and

category 5 device boards. These loads have low control bandwidth and will cause

the EPC9129 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.

Go to

www.epc-co.com

periodically for updates on new wireless power device demon-

stration boards capable of delivering a regulated output.

THERMAL CONSIDERATIONS

The EPC9129 demonstration system showcases the EPC8010, EPC2019,

EPC2038, and EPC2016C 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 EPC9129 demonstration system has limited current and thermal protection

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. Excessively wide coil coupling and load range variations

can lead to increased losses in the devices.

6 |

to the

Bypass mode

Pre-regulator

connection

jumper

JP1

Pre-regulator

Figure 3: Diagram of EPC9512 ZVS class-D amplifier circuit.

| EPC – EFFICIENT POWER CONVERSION CORPORATION |

Pre-Cautions

The EPC9129 demonstration system has no enhanced protection

systems and therefore should be operated with caution. Some specific

precautions are:

1. Never operate the EPC9129 system with a device board that is AirFuel

compliant as this system does not communicate with the device

to correctly setup the required operating conditions and doing so

can lead to failure of the device board. Please contact EPC should

operating the system with an AirFuel compliant device be required

to obtain instructions on how to do this. Please contact EPC at

[email protected]

should the tuning of the coil be required 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

evaluation 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.

3. Never connect the EPC9512 amplifier board into your VNA in an

attempt to measure the output impedance of the amplifier. Doing so

will severely damage the VNA.

SEPIC

Pre-regulator

19 V

Figure 2: Block diagram of the EPC9512 wireless power amplifier.

AMP

Coil connection

ZVS12

1_a

ZVS2

ZVS1

2_a

ZVS1

ZVS2

Demonstration System EPC9129

ZVS class D

4 V

–

C s

ampli er

80 V

I coil

Combiner

V amp

P amp

I amp

Control reference signal

1_b

Single

Ended

2_b

Operation

Jumper

WWW.EPC-CO.COM

Coil