IGBTs on Lysios

Innovation Gets Better Targets

In Audiozen we started with an Idea, sharing passion through innovation;

We're Growing, listening to your feedback helping us to do better;

We Bet on our choices, we Think that Innovation Gets Better Targets - IGBT.

We started about 10 years ago with an approach to Hi-Fi more philosophical than technical, searching for the best sound within the tradition plus innovation. For Lysios, we decided to use a new device called IGBT (Insulated Gate Bipolar Transistor).

icon5nIGBT is something of a cross between a conventional Transistor and a Mosfet, making it the ideal as a semiconductor device.

IGBT takes the best parts of these two types of common transistors, the high input impedance of a Mosfet with the low saturation voltage of a bipolar transistor, and combines them together to produce another type of transistor device that is capable of handling high currents with virtually zero gate current drive.

The first generation IGBTs of the eighties and early nineties of the last century were prone to failure through effects such as latch up (in which the device will not turn off as long as current is flowing) and secondary breakdown (in which a localized hotspot in the device goes into thermal runaway and burns the device out at high currents). Second generation devices were much improved and the current generation IGBTs are even better, with speed rivaling Mosfets, and excellent ruggedness and tolerance of overloads

Usually solid state amplifiers run complementary devices in n-channel and p-channel guise but IGBTs are available only as n-channel versions. Hence we developed a quasi-complementary circuit with just n-channel parts like great companies did in the early 70s, when p-channel power devices were still unavailable. It seems strange but it's easier to find and match two nearly equal n-channel parts than two complementary versions. We tested many IGBTs made by several manufacturers, and for our project lysios openthose by IXYS were best.

About 50 years ago, Mr. Baxandall discovered that a diode at a very precise point of a quasi-complementary circuit eliminates the local Miller effect to obtain superior linearity at high frequencies. It seems strange again but in many amplifiers with a quasi-complementary circuit, this Baxandall diode never appears. In our Lysios that Baxandall diode is present.

So by mixing a traditional quasi-complementary circuit, Baxandall diode, and the innovative modern IGBTs devices, we created our sound liberator aka Lysios.

[...] But it already does question why IGBTs seem to make such rare appearances in our sector when they can sound this good... - Srajan Ebaen (6 Moons)