Introduction: Trick devices in power electronic devices
Silicon-controlled rectifiers (SCRs), also called thyristors, are semiconductor power tools with a four-layer three-way joint structure (PNPN). Considering that its introduction in the 1950s, SCRs have been extensively made use of in industrial automation, power systems, home device control and various other areas due to their high stand up to voltage, large present bring ability, quick feedback and basic control. With the advancement of innovation, SCRs have actually advanced right into several kinds, consisting of unidirectional SCRs, bidirectional SCRs (TRIACs), turn-off thyristors (GTOs) and light-controlled thyristors (LTTs). The distinctions between these kinds are not just shown in the framework and working principle, yet likewise identify their applicability in different application situations. This short article will certainly begin with a technical perspective, combined with specific criteria, to deeply assess the main differences and regular uses these 4 SCRs.
Unidirectional SCR: Standard and secure application core
Unidirectional SCR is one of the most fundamental and common kind of thyristor. Its structure is a four-layer three-junction PNPN arrangement, including 3 electrodes: anode (A), cathode (K) and entrance (G). It only enables present to move in one instructions (from anode to cathode) and switches on after the gate is set off. Once switched on, even if eviction signal is removed, as long as the anode current is more than the holding existing (generally much less than 100mA), the SCR remains on.
(Thyristor Rectifier)
Unidirectional SCR has strong voltage and existing resistance, with an onward recurring optimal voltage (V DRM) of up to 6500V and a rated on-state typical current (ITAV) of approximately 5000A. Therefore, it is extensively made use of in DC electric motor control, commercial heater, uninterruptible power supply (UPS) rectification components, power conditioning tools and other occasions that require constant transmission and high power handling. Its advantages are straightforward framework, inexpensive and high reliability, and it is a core component of many traditional power control systems.
Bidirectional SCR (TRIAC): Suitable for air conditioner control
Unlike unidirectional SCR, bidirectional SCR, also referred to as TRIAC, can attain bidirectional transmission in both favorable and adverse half cycles. This framework contains 2 anti-parallel SCRs, which allow TRIAC to be set off and activated at any moment in the air conditioning cycle without transforming the circuit connection approach. The symmetrical transmission voltage variety of TRIAC is normally ± 400 ~ 800V, the optimum lots current is about 100A, and the trigger current is less than 50mA.
Due to the bidirectional conduction attributes of TRIAC, it is specifically ideal for a/c dimming and rate control in house home appliances and consumer electronic devices. As an example, tools such as lamp dimmers, fan controllers, and a/c unit follower speed regulators all rely upon TRIAC to attain smooth power policy. Furthermore, TRIAC also has a reduced driving power demand and appropriates for incorporated design, so it has been extensively used in smart home systems and tiny devices. Although the power density and switching speed of TRIAC are not just as good as those of brand-new power tools, its affordable and hassle-free usage make it a vital player in the area of tiny and average power air conditioning control.
Entrance Turn-Off Thyristor (GTO): A high-performance agent of active control
Entrance Turn-Off Thyristor (GTO) is a high-performance power gadget created on the basis of traditional SCR. Unlike average SCR, which can only be shut off passively, GTO can be turned off proactively by applying an adverse pulse current to eviction, hence accomplishing even more versatile control. This function makes GTO execute well in systems that call for constant start-stop or quick reaction.
(Thyristor Rectifier)
The technological parameters of GTO show that it has incredibly high power handling ability: the turn-off gain is about 4 ~ 5, the optimum operating voltage can reach 6000V, and the optimum operating current is up to 6000A. The turn-on time is about 1μs, and the turn-off time is 2 ~ 5μs. These efficiency indicators make GTO extensively made use of in high-power scenarios such as electrical engine traction systems, huge inverters, industrial electric motor regularity conversion control, and high-voltage DC transmission systems. Although the drive circuit of GTO is relatively intricate and has high changing losses, its efficiency under high power and high dynamic response needs is still irreplaceable.
Light-controlled thyristor (LTT): A trustworthy selection in the high-voltage isolation environment
Light-controlled thyristor (LTT) utilizes optical signals instead of electrical signals to trigger conduction, which is its largest function that distinguishes it from other kinds of SCRs. The optical trigger wavelength of LTT is normally in between 850nm and 950nm, the feedback time is measured in split seconds, and the insulation degree can be as high as 100kV or over. This optoelectronic seclusion mechanism substantially improves the system’s anti-electromagnetic interference ability and safety.
LTT is mostly used in ultra-high voltage straight existing transmission (UHVDC), power system relay defense tools, electromagnetic compatibility defense in medical equipment, and armed forces radar interaction systems etc, which have incredibly high requirements for security and security. For example, several converter stations in China’s “West-to-East Power Transmission” project have taken on LTT-based converter shutoff modules to make sure stable operation under incredibly high voltage conditions. Some advanced LTTs can also be integrated with gateway control to accomplish bidirectional conduction or turn-off features, even more increasing their application range and making them an optimal option for resolving high-voltage and high-current control issues.
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)
All articles and pictures are from the Internet. If there are any copyright issues, please contact us in time to delete.
Inquiry us
