Introduction: Secret gadgets in power electronic devices
Silicon-controlled rectifiers (SCRs), likewise called thyristors, are semiconductor power tools with a four-layer triple junction framework (PNPN). Given that its introduction in the 1950s, SCRs have been extensively used in commercial automation, power systems, home device control and other fields because of their high endure voltage, big present lugging capability, fast feedback and simple control. With the advancement of technology, SCRs have developed into numerous types, consisting of unidirectional SCRs, bidirectional SCRs (TRIACs), turn-off thyristors (GTOs) and light-controlled thyristors (LTTs). The distinctions between these kinds are not only mirrored in the structure and functioning concept, however likewise identify their applicability in different application situations. This short article will certainly begin with a technical viewpoint, integrated with particular parameters, to deeply examine the main distinctions and typical uses of these 4 SCRs.
Unidirectional SCR: Basic and stable application core
Unidirectional SCR is the most fundamental and typical kind of thyristor. Its structure is a four-layer three-junction PNPN plan, including three electrodes: anode (A), cathode (K) and gate (G). It just allows current to stream in one instructions (from anode to cathode) and activates after the gate is caused. Once turned on, also if eviction signal is gotten rid of, as long as the anode current is more than the holding existing (usually much less than 100mA), the SCR remains on.
(Thyristor Rectifier)
Unidirectional SCR has solid voltage and existing tolerance, with an ahead recurring optimal voltage (V DRM) of up to 6500V and a ranked on-state average present (ITAV) of approximately 5000A. As a result, it is widely used in DC motor control, commercial heater, uninterruptible power supply (UPS) rectification parts, power conditioning devices and other events that require continuous transmission and high power processing. Its benefits are simple structure, affordable and high integrity, and it is a core component of several typical power control systems.
Bidirectional SCR (TRIAC): Ideal for air conditioner control
Unlike unidirectional SCR, bidirectional SCR, also referred to as TRIAC, can accomplish bidirectional conduction in both positive and negative fifty percent cycles. This structure contains 2 anti-parallel SCRs, which permit TRIAC to be activated and activated at any time in the a/c cycle without altering the circuit connection method. The symmetrical transmission voltage series of TRIAC is typically ± 400 ~ 800V, the maximum tons current is about 100A, and the trigger current is less than 50mA.
Due to the bidirectional transmission attributes of TRIAC, it is particularly ideal for air conditioning dimming and rate control in home appliances and consumer electronic devices. For instance, gadgets such as light dimmers, follower controllers, and air conditioner fan speed regulatory authorities all rely on TRIAC to achieve smooth power regulation. On top of that, TRIAC likewise has a reduced driving power requirement and is suitable for integrated design, so it has actually been widely used in smart home systems and small appliances. Although the power thickness and changing rate of TRIAC are not like those of new power tools, its affordable and hassle-free use make it an important gamer in the area of little and medium power AC control.
Gateway Turn-Off Thyristor (GTO): A high-performance rep of active control
Gateway Turn-Off Thyristor (GTO) is a high-performance power tool developed on the basis of typical SCR. Unlike ordinary SCR, which can just be shut off passively, GTO can be switched off proactively by using an unfavorable pulse existing to eviction, therefore achieving more flexible control. This attribute makes GTO perform well in systems that call for constant start-stop or fast action.
(Thyristor Rectifier)
The technological parameters of GTO show that it has extremely high power taking care of ability: the turn-off gain has to do with 4 ~ 5, the optimum operating voltage can get to 6000V, and the optimum operating current is up to 6000A. The turn-on time has to do with 1μs, and the turn-off time is 2 ~ 5μs. These performance signs make GTO extensively used in high-power scenarios such as electrical locomotive grip systems, huge inverters, industrial electric motor frequency conversion control, and high-voltage DC transmission systems. Although the drive circuit of GTO is fairly complex and has high changing losses, its performance under high power and high dynamic response needs is still irreplaceable.
Light-controlled thyristor (LTT): A reputable choice in the high-voltage isolation atmosphere
Light-controlled thyristor (LTT) uses optical signals rather than electrical signals to set off transmission, which is its most significant function that identifies it from other types of SCRs. The optical trigger wavelength of LTT is generally between 850nm and 950nm, the response time is measured in nanoseconds, and the insulation level can be as high as 100kV or over. This optoelectronic seclusion mechanism substantially boosts the system’s anti-electromagnetic disturbance capability and safety.
LTT is primarily utilized in ultra-high voltage direct present transmission (UHVDC), power system relay security tools, electro-magnetic compatibility security in clinical equipment, and military radar interaction systems and so on, which have incredibly high needs for security and security. For instance, lots of converter stations in China’s “West-to-East Power Transmission” task have taken on LTT-based converter valve components to ensure stable operation under extremely high voltage problems. Some advanced LTTs can likewise be incorporated with gate control to attain bidirectional conduction or turn-off features, additionally increasing their application array and making them a suitable option for resolving 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 types of controlled rectifier, please feel free to contact us.(sales@pddn.com)
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