EPC 9104 Краткое руководство по эксплуатации - Страница 8

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7 V – 12 V

Gate Drive and

Control Supply

(note polarity)

Coil Voltage

Feedback

(Operation

only)

External

Oscillator

(Operation

only)

Upper FET

External

Gate Signal

(Operation

only)

Lower FET

Lower FET Gate Oscilloscope

Figure 3: Proper Connection and Measurement Setup for the Source Board

Mechanically

Attached

Device Coil

to these

locations

Source

Board

Connection

Coil

Voltage

Feedback

(see Notes

for details)

Figure 4: Proper Connection and Measurement Setup for the Source Coil

Upper FET Gate

Switch-node

Oscillatoscope Probe

Oscilloscope Probe

Switch-node -

hole & post

(see Notes

for details)

Source Coil

Connection

EPC

3 V – 24 V

Supply

(note polarity)

EFFICIENT POWER CONVERSION

• Avoid contact with the load bank surface as it can be hot when in operation.

• Never operate the system without a load or a load less than the minimum

built into the Device board as this can cause currents in the source circuit to

become very high and lead to over-current failure.

• Always make use the ammeter is connected to the load circuit when NOT

using the built-in load current shunt. An open circuit can cause currents in

the source circuit to become very high and lead to over-current and/ or over-

voltage failure.

• Do not change load jumper settings when circuit is in operation.

• Do not press the start button after the system has started and is operating on

its own when using the coil voltage feedback method.

• Never press the start button when using an external oscillator for control.

• Never disconnect any of the coils while the circuit is in operation.

• When attempting tests with multiple device loads, always make sure at least

one device load is correctly set and physically in proximity to the source coil

such that the system operates within speci cations.

• When conducting tests near or at full power, always monitor the temperature

of the heat-sink and matching circuit inductors to ensure that operation is

within speci cations.

• Never attempt to monitor, using standard oscilloscope probes, the upper gate

voltage (SJ40) simultaneously with the lower gate voltage (SJ42) with any volt-

age applied to the main circuit (J62). The oscilloscope probes will short out the

lower device and induce the possibility of a shoot-through condition for the

upper device which can lead to failure. The only exception is if the upper gate

voltage is being monitored using an approved di erential probe, however

even this method of measurement must be limited as induced stray capaci-

tances and inductances can signi cantly alter the performance of the circuit

and resulting oscillations may lead to over-voltages and ultimately failure.

• Always use the supplied hardware to re-assembly the unit and never substi-

tute metal screws, nuts and washers for the nylon versions as they may induce

short-circuits into the boards.