Renesas three-phase (T-type) DC AC inverter: a double victory of efficiency and compactness

【Lansheng Technology News】With the global pursuit of sustainable energy and efficient energy solutions, traditional power conversion technologies are no longer able to meet the needs of modern complex applications. As the key core of power conversion, the application of inverters has also undergone tremendous changes. Among them, three-phase (T-type) DC AC inverters have played an important role in modern power conversion due to their high efficiency, excellent control performance and wide range of application fields. plays an increasingly important role in solutions.

From microcontrollers to IGBTs, Renesas Electronics advances power conversion technology revolution

Three-phase (T-type) inverter is an innovative power conversion technology that mainly uses a special "T-type" circuit topology to convert direct current (DC) to alternating current (AC). Its unique feature is that the "T"-shaped configuration of three switches (two upper arm switches and one lower arm switch) achieves precise control of the output voltage and current, while also reducing switching losses and conduction losses.

Renesas' three-phase (T-type) DC-AC inverter uses an advanced circuit topology that can significantly improve system efficiency and reduce the size of filter reactors. This not only optimizes the energy conversion process, but also reduces the physical volume of the overall system, making it more suitable for applications with limited space.

Efficient PWM control

The solution utilizes Renesas Electronics' highly efficient 32-bit RX66T microcontroller, which is capable of synchronously operating 6-channel GPT timers and simultaneously outputting 12 PWM gate signals required for a 3-wire inverter. This precise control method greatly improves the system's operating efficiency and response speed.

The RX66T series of microcontrollers are Renesas Electronics' first products equipped with the RXv3 third-generation RX CPU core and are ideal for motor control applications. The RX66T series can control up to four motors simultaneously through the CPU core and motor control peripherals with a maximum operating frequency of 160 MHz. In addition, built-in safety functions provide new added value for variable frequency control applications.

Reduce switching losses

In this system, the IGBT part uses the RBN75H65T1FPQ-A0 with built-in fast recovery diode (FRD), which supports a maximum voltage of 650V and a current of 75A, and adopts the classic TO-247A package. At the same time, the system also introduced another high-voltage IGBT RBN75H125S1FP4-A0 that supports 1250V and 75A. This device also has FRD embedded and uses a more advanced TO-247plus package, further improving the overall performance and reliability of the system. . This carefully matched IGBT combination forms a power conversion core module with high efficiency and strong stability.

In the gate drive part, Renesas uses the RV1S9231A photocoupler. This coupler integrates an AlGaAs LED on the input side of its monolithic structure and a photodiode, sophisticated signal processing circuitry and power MOSFET on the output side. It features high common-mode transient immunity (CMR) and high switching speed.

The integrated gate driver and IGBT design not only ensures the stability and reliability of the system, but also effectively reduces energy loss during the switching process. This is critical for any high-performance application, especially today with rising energy costs.

In addition, the entire system also includes high-performance industry standard single-ended current mode PWM controller ISL8844A, analog output optically coupled isolation amplifier PS8352AL2, linear voltage regulator RAA214250, 12MHz rail-to-rail input and output operational amplifier EL5220T, with internal Compensated and programmable frequency integrated FET 30V, 5A synchronous buck regulator RAA211250.

As technology continues to advance and the demand for greener and more efficient power solutions increases, three-phase (T-type) DC-AC inverters represent a new direction in power conversion technology. With its strong product portfolio and strong technical strength, Renesas Electronics has launched a three-phase (T-type) DC AC inverter solution that can be widely used in photovoltaic power regulation, uninterruptible power supplies (UPS) and industrial three-phase DC/AC inverters. Transform power and other fields to meet the growing demand for energy efficiency and environmental sustainability.

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