Toshiba’s optical isolation devices help photovoltaic systems more stable, more efficient and safer

With the continuous improvement of the complexity and performance of photovoltaic systems, more and more optical isolation devices are widely used in system design, and their excellent performance ensures the reliability and high efficiency of the system. As a leader in optical isolation devices, Toshiba semiconductor‘s various optical isolation devices have been widely used in many industrial automation systems.

With the continuous improvement of the complexity and performance of photovoltaic systems, more and more optical isolation devices are widely used in system design, and their excellent performance ensures the reliability and high efficiency of the system. As a leader in optical isolation devices, Toshiba Semiconductor’s various optical isolation devices have been widely used in many industrial automation systems.

In a typical servo motor or photovoltaic inverter application system (as shown in Figure 1), in order to achieve grid-connected energy storage and other control applications, a variety of optical isolation devices, as well as a number of different types of drive optocouplers and isolation amplifiers, are required Together, it can be said that the selection of these optical isolation devices is critical to the performance and reliability of the entire system. As an advanced supplier of optical isolation devices, Toshiba has obvious technological and market advantages in driving optocouplers and optical isolation amplifiers.

Toshiba’s optical isolation devices help photovoltaic systems more stable, more efficient and safer

Figure 1 Typical AC servo motor or inverter system structure diagram

Speaking of optocouplers, this is a relatively uncomplicated semiconductor device. It is an insulating element that converts electrical signals into light through a light-emitting element and receives light through a light-receiving element to achieve signal transmission. As a relatively common isolation control device, the optical coupler encapsulates the light-emitting element and the photosensitive element in the same housing to ensure that they are not interfered by the outside world. The main advantage of the optocoupler is the one-way signal transmission, the input end and the output end are completely electrically isolated, the anti-interference ability is strong, the service life is long, and the transmission efficiency is high. In complex industrial systems, due to the small size of optocoupler devices, fast response speed, good isolation effect, and strong anti-interference ability, they are widely used in level conversion, signal isolation, inter-level isolation, switch circuits, and long distances. Signal transmission, pulse amplification, solid state relay (SSR), instrumentation, communication equipment and microcomputer interface.

At present, Toshiba can provide a full range of optocoupler product lines, covering multiple applications such as consumer products, industrial, automotive, and photovoltaics. Among Toshiba’s many industrial optical devices, driving optocouplers, isolation amplifiers and photorelays are widely used products, which play an important role in industrial inverters, AC servo motors and solar inverters. Strictly speaking, the latter two products are expanded on the basis of optocouplers with more functions. Toshiba’s optocoupler products achieve a small package while ensuring excellent isolation performance, which helps to improve system safety. Reduce power consumption and reduce the size of end products.

Toshiba has distinctive features in driving optocoupler technology. The most notable feature is that optocoupler products have high reliability, long life, not only high withstand voltage, but also a maximum operating temperature of 125 degrees. The realization of these features is derived from Toshiba’s optocoupler using the industry’s long-lived LED and powerful high-performance light sensor chip, and combined with an ultra-small-size packaging process, achieving the perfection of miniaturization, high reliability and high performance Fusion. On the other hand, Toshiba’s optocoupler has a very low operating current, so the power consumption of the product is very small, which can significantly improve the energy efficiency of the entire system, and effectively improve the output power consumption ratio of the servo system or the conversion efficiency of the solar photovoltaic inverter.

Toshiba’s optical isolation devices help photovoltaic systems more stable, more efficient and safer

Figure 2 Toshiba Semiconductor Optocoupler Structure and Technical Advantages

Toshiba’s optocoupler product series have a long history. Traditional package (DIP8 package) products suitable for IGBT drive have been widely used for many years and have maintained a stable high market share. In 2016, Toshiba followed the trend of miniaturization and launched the TLP575x series of rail-to-rail output gate drive photocouplers in a low-height SO6L package, including “TLP5751” for driving low-power IGBTs and “TLP5752” for driving medium-power IGBTs. ”And “TLP5754”, the height is only 54% of the previous generation, and the installation area is only 43% of the previous generation, which helps designers develop slimmer and compact devices, such as direct drive of low and medium power IGBTs and power MOSFET. This series is built-in Toshiba’s original high-power infrared LED, suitable for a variety of applications including high thermal stability, such as factory automation, household photoelectric power system, digital home appliances and uninterruptible power supply (UPS). Although TLP575x is low in height, it still guarantees a creepage distance of 8mm and an insulation voltage of 5kV. Toshiba later introduced a high operating temperature version with an operating temperature of 110 degrees Celsius to 125 degrees Celsius to meet more extreme application scenarios. In terms of electrical characteristics, TLP575x has rail-to-rail output, and can achieve higher efficiency by expanding the operating voltage range in the full-swing output state; it provides three output currents of 1A, 2.5A and 4A to meet a wide range of user needs .

In addition to TLP5754 and the high-temperature version of TLP5754H, Toshiba can provide the TLP577x series for the needs of a new generation of power devices, which are suitable for driving MOSFETs and SiC MOSFETs. In response to high-power requirements, gate drive optocouplers with smart protection functions such as TLP5214A, TLP5231, and TLP5212 (to be mass produced at the end of 2020) can meet the actual needs of high-power projects.

As an indispensable signal chain unit in photovoltaic systems and servo systems, optical coupling isolation amplifiers are a combination of optocouplers and ΔΣ ADCs, and are mainly suitable for realizing current sensors and voltage sensors.In order to meet the high-precision requirements of industrial equipment, Toshiba has specially equipped the input terminals of its optocoupler isolation amplifiers TLP7820 (thin SO8L package) and TLP7920 (DIP8 package) with ΔΣ ADCs, thus achieving the current high level of linearity in the industry― ―A typical analog output product[email protected]