Intro: Secret devices in power electronic devices
Silicon-controlled rectifiers (SCRs), likewise referred to as thyristors, are semiconductor power devices with a four-layer triple joint framework (PNPN). Because its introduction in the 1950s, SCRs have actually been commonly used in industrial automation, power systems, home device control and various other areas because of their high stand up to voltage, large present lugging capacity, quick action and simple control. With the development of technology, SCRs have developed right into many kinds, consisting of unidirectional SCRs, bidirectional SCRs (TRIACs), turn-off thyristors (GTOs) and light-controlled thyristors (LTTs). The differences between these types are not just mirrored in the structure and working concept, yet also establish their applicability in various application scenarios. This short article will certainly begin with a technological viewpoint, incorporated with specific specifications, to deeply evaluate the primary differences and normal uses these four SCRs.
Unidirectional SCR: Basic and stable application core
Unidirectional SCR is the most fundamental and usual kind of thyristor. Its framework is a four-layer three-junction PNPN setup, consisting of three electrodes: anode (A), cathode (K) and entrance (G). It only permits present to flow in one direction (from anode to cathode) and turns on after the gate is set off. As soon as switched on, even if eviction signal is eliminated, as long as the anode current is above the holding current (normally much less than 100mA), the SCR continues to be on.
(Thyristor Rectifier)
Unidirectional SCR has solid voltage and present resistance, with an onward repetitive peak voltage (V DRM) of as much as 6500V and a rated on-state average current (ITAV) of approximately 5000A. Therefore, it is widely used in DC electric motor control, industrial heater, uninterruptible power supply (UPS) correction components, power conditioning devices and various other celebrations that need continual transmission and high power processing. Its benefits are basic framework, affordable and high integrity, and it is a core component of many typical power control systems.
Bidirectional SCR (TRIAC): Perfect for a/c control
Unlike unidirectional SCR, bidirectional SCR, additionally called TRIAC, can achieve bidirectional transmission in both positive and unfavorable half cycles. This structure consists of 2 anti-parallel SCRs, which allow TRIAC to be set off and activated at any moment in the AC cycle without transforming the circuit link approach. The balanced conduction voltage series of TRIAC is generally ± 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 ideal for a/c dimming and rate control in family home appliances and consumer electronic devices. For instance, devices such as light dimmers, follower controllers, and a/c unit follower rate regulatory authorities all rely upon TRIAC to accomplish smooth power law. Furthermore, TRIAC likewise has a lower driving power requirement and appropriates for incorporated style, so it has been widely utilized in wise home systems and small appliances. Although the power thickness and changing rate of TRIAC are not comparable to those of brand-new power devices, its inexpensive and practical use make it a crucial player in the area of tiny and medium power a/c control.
Entrance Turn-Off Thyristor (GTO): A high-performance agent of active control
Gateway Turn-Off Thyristor (GTO) is a high-performance power gadget developed on the basis of traditional SCR. Unlike ordinary SCR, which can only be turned off passively, GTO can be shut off actively by applying a negative pulse existing to eviction, thus accomplishing even more versatile control. This function makes GTO execute well in systems that call for frequent start-stop or quick feedback.
(Thyristor Rectifier)
The technical criteria of GTO show that it has exceptionally high power dealing with ability: the turn-off gain is about 4 ~ 5, the optimum operating voltage can get to 6000V, and the optimum operating current depends on 6000A. The turn-on time is about 1μs, and the turn-off time is 2 ~ 5μs. These performance signs make GTO widely utilized in high-power situations such as electrical locomotive traction systems, large inverters, industrial motor regularity conversion control, and high-voltage DC transmission systems. Although the drive circuit of GTO is fairly complex and has high changing losses, its efficiency under high power and high vibrant response needs is still irreplaceable.
Light-controlled thyristor (LTT): A trusted option in the high-voltage seclusion atmosphere
Light-controlled thyristor (LTT) uses optical signals as opposed to electric signals to trigger transmission, which is its largest attribute that identifies it from other sorts of SCRs. The optical trigger wavelength of LTT is generally in between 850nm and 950nm, the action time is determined in nanoseconds, and the insulation degree can be as high as 100kV or over. This optoelectronic isolation device significantly improves the system’s anti-electromagnetic interference capacity and safety and security.
LTT is mostly utilized in ultra-high voltage straight existing transmission (UHVDC), power system relay protection devices, electromagnetic compatibility security in clinical equipment, and army radar communication systems etc, which have extremely high demands for safety and security and security. For example, several converter terminals in China’s “West-to-East Power Transmission” task have adopted LTT-based converter shutoff components to make certain steady procedure under exceptionally high voltage problems. Some advanced LTTs can likewise be integrated with entrance control to achieve bidirectional transmission or turn-off functions, additionally broadening their application variety and making them a perfect option for fixing high-voltage and high-current control issues.
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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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