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Intro: Trick gadgets in power electronic devices

Silicon-controlled rectifiers (SCRs), also referred to as thyristors, are semiconductor power devices with a four-layer three-way joint structure (PNPN). Because its intro in the 1950s, SCRs have been commonly made use of in commercial automation, power systems, home appliance control and various other areas due to their high hold up against voltage, large present lugging capacity, quick reaction and basic control. With the development of technology, SCRs have evolved into many types, consisting of unidirectional SCRs, bidirectional SCRs (TRIACs), turn-off thyristors (GTOs) and light-controlled thyristors (LTTs). The distinctions between these types are not only mirrored in the framework and functioning principle, however also determine their applicability in different application situations. This article will begin with a technical perspective, combined with certain parameters, to deeply assess the main distinctions and normal uses these four SCRs.

Unidirectional SCR: Fundamental and stable application core

Unidirectional SCR is the most fundamental and usual sort of thyristor. Its structure is a four-layer three-junction PNPN plan, including 3 electrodes: anode (A), cathode (K) and gate (G). It only enables existing to stream in one direction (from anode to cathode) and activates after the gate is triggered. Once turned on, even if eviction signal is eliminated, as long as the anode current is higher than the holding current (generally much less than 100mA), the SCR remains on.

(Thyristor Rectifier)

Unidirectional SCR has solid voltage and present tolerance, with an onward recurring height voltage (V DRM) of up to 6500V and a ranked on-state typical present (ITAV) of up to 5000A. Therefore, it is commonly used in DC electric motor control, industrial heater, uninterruptible power supply (UPS) correction components, power conditioning gadgets and other celebrations that call for constant transmission and high power handling. Its benefits are easy framework, affordable and high reliability, and it is a core element of many typical power control systems.

Bidirectional SCR (TRIAC): Perfect for a/c control

Unlike unidirectional SCR, bidirectional SCR, also known as TRIAC, can achieve bidirectional conduction in both favorable and negative fifty percent cycles. This framework includes two anti-parallel SCRs, which allow TRIAC to be caused and activated any time in the air conditioning cycle without transforming the circuit connection method. The balanced transmission voltage range of TRIAC is typically ± 400 ~ 800V, the maximum lots current is about 100A, and the trigger current is much less than 50mA.

As a result of the bidirectional conduction attributes of TRIAC, it is specifically suitable for a/c dimming and rate control in household devices and consumer electronics. For example, tools such as lamp dimmers, follower controllers, and a/c follower speed regulatory authorities all count on TRIAC to achieve smooth power guideline. Furthermore, TRIAC likewise has a reduced driving power need and appropriates for integrated design, so it has actually been widely utilized in smart home systems and small home appliances. Although the power density and changing speed of TRIAC are not just as good as those of brand-new power gadgets, its low cost and practical usage make it a crucial player in the area of tiny and average power a/c control.

Entrance Turn-Off Thyristor (GTO): A high-performance rep of energetic control

Gateway Turn-Off Thyristor (GTO) is a high-performance power device created on the basis of conventional SCR. Unlike normal SCR, which can only be switched off passively, GTO can be switched off proactively by using a negative pulse existing to eviction, therefore attaining more versatile control. This attribute makes GTO carry out well in systems that call for constant start-stop or rapid reaction.

(Thyristor Rectifier)

The technical specifications of GTO reveal that it has very high power handling capacity: the turn-off gain has to do with 4 ~ 5, the optimum operating voltage can get to 6000V, and the optimum operating current depends on 6000A. The turn-on time has to do with 1μs, and the turn-off time is 2 ~ 5μs. These performance indicators make GTO widely utilized in high-power situations such as electric engine grip systems, big inverters, commercial electric motor regularity conversion control, and high-voltage DC transmission systems. Although the drive circuit of GTO is relatively complex and has high changing losses, its performance under high power and high vibrant reaction demands is still irreplaceable.

Light-controlled thyristor (LTT): A dependable selection in the high-voltage isolation atmosphere

Light-controlled thyristor (LTT) uses optical signals as opposed to electric signals to trigger transmission, which is its biggest function that identifies it from other kinds of SCRs. The optical trigger wavelength of LTT is normally in between 850nm and 950nm, the feedback time is gauged in nanoseconds, and the insulation level can be as high as 100kV or over. This optoelectronic isolation mechanism considerably improves the system’s anti-electromagnetic disturbance ability and safety and security.

LTT is mostly made use of in ultra-high voltage direct current transmission (UHVDC), power system relay protection gadgets, electro-magnetic compatibility protection in medical tools, and military radar interaction systems and so on, which have exceptionally high needs for security and security. For instance, several converter stations in China’s “West-to-East Power Transmission” job have actually adopted LTT-based converter valve modules to ensure stable operation under extremely high voltage conditions. Some advanced LTTs can likewise be combined with gate control to attain bidirectional conduction or turn-off functions, additionally expanding their application range and making them an ideal selection for solving high-voltage and high-current control problems.

Vendor

Luoyang Datang Energy Tech Co.Ltd focuses on the research, development, and application of power electronics technology and is devoted to supplying customers with high-quality transformers, thyristors, and other power products. Our company mainly has solar inverters, transformers, voltage regulators, distribution cabinets, thyristors, module, diodes, heatsinks, and other electronic devices or semiconductors. If you want to know more about , please feel free to contact us.(sales@pddn.com)

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