High-power IGBT Soft-switch Technology

In high-frequency applications, IGBT switching losses is relatively conspicuous, soft-switch technology can be on or off in IGBT current or voltage , which not only reduced switching losses, but also improved the voltage and current waveforms. In the high-voltage power IGBT circuit with the soft-switch, also used the low-resistance MOSFET as a supplement to achieve zero-voltage and zero-current opening.

High-power IGBT Integrated Drive and Protection Technology

In IGBT applications, drivers and protection are very important, inappropriate driving circuit may lead to IGBT damage and the protection malfunction; inappropriate protection circuit will result in abnormal condition IGBT damage. The company IGBT integrated drive and protection circuit used in MAXF high-voltage inverter have short circuit protection, over current, over-voltage and over-temperature protection and so on.

New IGBT Temperature Measurement Methods

New IGBT temperature measurement method can directly measure IGBT shell temperature, not radiator temperature. And this measurement method cna quickly find IGBT possible problems, improve the reliability of circuit.

IGBT Inverter Circuits Output dv/dt Suppression Technology

In IGBT inverter circuits, the output dv/dt usually reach 4000 V/uS if not inhibited, fast devices or even 10000 V/uS.Such a high dv/dt not only caused great electromagnetic compatibility issues and to external devices (such as Motor) damage.The new circuit can effectively curb output dv/dt in the 500 V/uS within, and loss of small and not cause additional oscillation.

The Development of Large-capacity High-voltage Power Capacitors

In-voltage inverter circuits, need large-capacity storage capacitors, electrolytic capacitors are used currently with low pressure, fever, use-life and so obvious shortcomings. In the high-pressure MAXF frequency inverter, We developed a high-voltage large capacity Promise (dry) power capacitors, completely replacing the traditional electrolytic capacitor, with long life (20 years), high pressure, no Series, no fever, and other significant advantages.

Optical Signal Transmission and Control Technology

In power electronic devices applications,, optical signal transmission and control technology are widely used in recent years, with a strong anti-interference capability, high-speed transmission, small transmission delay, and other characteristics. In MAXF frequency inverter, the fiber-optic communications is used between the main controller and power unit.

Research on High-voltage Inverter Automatically Re-run of Consecutive Closing

We must ensure that motor continuous operation to the key equipment.

High-voltage Inverter Inserted Unit Movements Structure

To facilitate the installation and on-line replacement, we developed a built-in take-off and landing module which used cables and pulley structure.

Cooling fan 1:1 backup method

The reliability of the cooling fan is a weak link in forced air-cooled system.In order to ensure the device for long-term reliable operation, it is necessary to achieve 1:1 backup cooling fan.Fan running in the event of a failure automatically switch to standby fan running, and in the wind Road to switch. In this way, cooling system greatly enhanced the reliability and trouble-free hours MTBF average increase several times.

Hydrogen-cooled generator hydrogen purity on-line detection method

Hydrogen purity of the traditional on-line detection by conduction, has the advantages of simple lines and measurement system, but there sensor probe easily defaced, long response time, low accuracy and other shortcomings. This method is based on the principle of the gas density by a centrifugal fan Pressure by the microprocessor be calculated and compensation after gas purity, with high accuracy, high reliability and long-term continuous operation, the corresponding fast notable advantages.

Large brushless excitation generator excitation voltage¤t calculation method

Brushless excitation generators exciting current can not be measured directly from the outside, but by measuring the generator stator current, voltage, power factor, checking the V-shaped curve, the generator can be measured to the exciting current and excitation voltage, and thus calculate the excitation current. Compare with the measured current, the generator rotor can be informed of the existence of inter-turn short-circuit, or whether there are other fault.

Large-scale rectifier circuit for over-voltage suppression

In megawatt-class large-scale rectification circuit for the inductive load, because there rectifier diode reverse recovery charge, for the current phase, will have a higher commutation over-voltage, if not inhibited, will lead to increased losses and could damage the device. Through research and testing system, single-tube or full-bridge RC-protection can be used to curb over-voltage and play a role in reducing losses.

SCR reverse-blocking bridges over-voltage suppression

SCR bridge the traditional over-voltage suppression circuit complexity, the number of components, wear and tear, and poor installation process. With SCR raising the level of performance, over-voltage suppression circuit no longer need so complicated.In absorbing foreign technologies, based on a system of reverse-blocking SCR bridge over-voltage suppression technology, this method is simple lines, good technology, high reliability and the characteristics of existing sets of dozens of large-scale use of this method Equipment in stable operation.