WEBVTT
Kind: captions
Language: en

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♪ Hot dog ♪

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We've grilled hot dogs using line voltage

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on other demos to show
the dangers of unisolated high voltage.

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In this demo, we’ll show
a controlled,

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isolated hot-dog electrocutor.

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It’s still dangerous,

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and there are better
ways to cook a hot dog,

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but the circuitry is important
for applications such as

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battery charging and motor control.

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A rectifier and capacitor

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convert AC line voltage
to approximately 170 volts DC.

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A silicon carbide FET
modulates the voltage to the load.

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We left high-voltage wiring
and the hot dog itself exposed

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so you can see what’s going on.

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We don’t recommend that.

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The Variac is for soft start,
since it’s not a good idea

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to connect circuitry like this
directly to line voltage.

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We’re planning to add

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an isolated solid-state soft start
on future versions.

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A non-contact current sensor
evaluation board

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measures the current drawn by the hot dog.

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Cooking is controlled by an Arduino.

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On the shield,
an isolator protects the Arduino

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from the high voltage,

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and one of our DC-to-DC convertors
provides isolated power

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to drive the FET.

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This isolator can drive some FETs directly,

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but for this FET
we have a separate gate driver.

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There’s also a beeper to signal
when the hot dog is done.

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Let's start it up.

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The cooking power starts high;

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then decreases to avoid burning.

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The profile is defined
in the Arduino.

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Here’s the rest of the Arduino program:

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The setup routine...

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We cycle through the cooking stages…

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Here we power the FET,

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and measure the hot dog current with
the GMR current sensor.

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The circuit-breaker routine,
that protects against overcurrent.

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And the display routine.

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Here's the schematic:

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The DC-to-DC convertor

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provides an isolated five-volt supply
to power the isolator

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and an isolated nine-volt gate supply.

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[Three beeps]

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It’s perfect!

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The current sensor provides

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overcurrent protection.

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It kicks in if we overcook the hot dog.

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[Long beep]

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So we’ve demonstrated isolated power control

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and overcurrent protection
for added safety.

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Future safety enhancements
we’re planning include:

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• AC soft start;

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• An enclosure interlock; and

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• A temperature sensor.

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These are the key parts in this demo:

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IL600-Series isolators have:

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• best-in-class
Common-Mode Transient Immunity;

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• an extended three to 6.6-volt
power supply range

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for full direct-drive of six-volt MOSFET gates;

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• full isolation;

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• no input-side power supply;

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• and ultraminiature packages.

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Key ILDC-Series
DC-to-DC convertor specifications are:

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• various output voltages--

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we used the five-volt version in this demo;

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• soft start--

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so the microcontroller can start
before the FET is powered;

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• best-in-class isolation;

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• the full industrial temperature range;

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• and a DFN version that’s
the world’s smallest isolated DC-DC convertor.

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Click, email, or call
for more information.

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Our engineers would “relish” a chance to
“ketchup” on your requirements.