The full-digitally controlled Gate Drive Unit (GDU) for High Power Insulated Gate Bipolar Transistors (IGBT) provides all necessary features, such as active control, active clamping during switching off and active balancing of the collector voltage for IGBTs connected in series.

• Wide input voltage range
• Low power consumption
• Variable gate array
• Multiple soft turn-off
• Multiple overcurrent protection
• Multiple overvoltage protection
• Active clamp protection
• High isolation voltage
• LED error indication
• Feedback function

• Military grade single phase filters are available from 1A to 35A.
• dramatically reducing EMC/EMI noise of switching power supplies and inverters
• good common/differential mode insertion loss performance
• wide frequncy range with typical 400Hz working point
• customized design for specified insertion loss, working current, voltage, size and connection type

Circuit board filtering module is the most suitable product for DC/DC power supply to suppress the noise. Compliance with the military standard, the working temperature is from -55°C to +125°C.

By introducing the cascaded H-Bridge multilevel inverter topology and an advanced algorithm on a digital signal processor (DSP), the UPS inverts DC current to 3-phase AC output. Together with the modular, hot-plugging, multi-mode, decentralized logic parallel connection, touch panel operation, this device is equipped with the latest technology. Comparing with the other inverter, the power loss and the high order harmonic of output are reduced by nearly 50%. With the small size, we have achieved even higher power density.

Designed high power welding machine and charging station of the electric vehicle, the DMR95 ferrite material gives the full-bridge topological transformer extraordinary working properties under 50 kHz - 200 kHz with the power between 5 kW - 40 kW.

The inductive components are most commonly used the power electronics. Crootem provides consultation and engineering of power source in:

1. Inductive components
2. Filtering circuit
3. Mass production

The inductive components are most commonly used the power electronics. Crootem provides consultation and engineering of power source in:

1. Inductive components
2. Filtering circuit
3. Mass production

With standardized and customized magnetic components and EMI filter solution for military-grade power supply, UPS emergency power, smart grid, rail transport, Photovoltaic grid-connected inverter, communication, Crootem Electronics involving actively in the renewable energy, e-mobility, defense and industrial applications.

Soft-Switching Resonant Inductor

With the increasing demands of the soft-switching power supply circuit, many producers are confronting the low homogeneity in mass production, which refers to the source of controlling signal which is generated by the leakage inductance of the transformer and stray capacitance of power MOSFET. To get rid of this problem, the common solution is to add the resonant inductance. Therefore the designer shall consider the choice of an inductor with properties of:

1. with low variation with AC/DC current;
2. low power loss at high frequency;