Triac-SCR-Thyristor
A center-tap 50Hz step-down transformer with two diodes is utilized to generate a series of positive sine pulses at 100Hz, which is applied to the base of Q6 through resistor R51. The 2N2646 is a unijunction transistor (UJT) housed in a TO-18 metal package. The control voltage, proportional to the error, is supplied to R56-Q3. The UJT drives a pulse transformer that provides isolation from the load controlled by the SCR bridge. This phase angle control enables nearly linear closed-loop control for an SCR bridge, which may be employed in electroplating or as a preregulator for a large power supply. This configuration is a normally closed PCB mount solid-state relay (SSR), meaning that when the DC control input is low, the triac is on, allowing current to pass through the load, activating devices such as small heaters, motors, lamps, or larger contactor drives. When the DC input is high, the output is off. This relay is also optically isolated from the mains. A microcontroller output, buffered by a driver, can actuate this relay. In larger systems, it is advisable to place these SSR modules on a separate PCB to avoid proximity of mains wiring to logic circuits. However, this design is not suitable for medical electronics or critical applications.
This is an AC control input, AC output SSR solid-state relay. When a process controller has an AC output or a system generates an AC signal above 100V AC to signal the load to turn on, this device can be employed. A BTA40-600 and MOC3041 are utilized in this configuration. A high-voltage plastic capacitor limits current to a bridge that generates a small DC from 230V AC, which drives the MOC3041. The remainder of the circuit operates similarly. It is preferable to use a DC control SSR when feasible. This AC control SSR is applied where only an AC control signal is available.
The SSR is housed in a fire-retardant plastic enclosure designed for stackable I/O modules. The DC control is intended for AC loads, typically to control a larger three-phase contactor, pneumatic or steam valves, solenoids, or motors. When mounted at the end of the PCB, it provides over 2kV isolation from digital circuits. The output 230V signals can be normally open (NO) or normally closed (NC) and can control light loads such as the coil of a large 230V relay, also known as a contactor. It can be mounted on a PCB by soldering or using a plugin base, with crimped connections or terminals recommended for better reliability.
This configuration describes an R-Y-B three-phase 40A 440V AC solid-state relay with a 3-30V DC control signal. It features a built-in heat sink and fan, making it suitable for controlling a bank of heaters. This model can accommodate up to 120A with multiple SSRs used in parallel for proportional control. Solid state relays (SSR) serve as a replacement for contactors, capable of switching R-Y-B phases. Although SSRs provide fast switching, zero wear and tear, and immunity to dust and humidity, there are situations where electromechanical contactors may perform better.
This is a DC-controlled solid-state relay capable of turning 230V AC equipment on and off. The output functions similarly to normally open contacts of a relay and must be connected in series with the load like any other switch. Caution should be exercised as this relay is not intended for large inductive loads such as large motors. The Q1 transistor limits current through the LED by providing an alternate path for additional current. The DC input can range from 3V to 20V, and the triac should be selected based on the current requirements of the load. Reference datasheets and applications from STMicroelectronics for the BTA41600 for further information.
This configuration employs phase angle control of a triac, which is an evolution of an SCR. The 50Hz or 60Hz sine wave from the mains can be triggered at any point after the zero crossing. The voltage ramps up in the sine wave, creating a near-linear slope that can be used to initiate the ON state with a delay after the zero crossing, when the voltage is zero. This method resembles pulse-width modulation (PWM) but operates only at low frequencies. Early switched-mode power supplies (SMPS) for televisions and mains inverters developed by Siemens were built around SCRs.A Center tap 50Hz Step Down Transformer with two diodes is used to get a train of Positive Sine Pulses at 100Hz which is applied to Q6 base via R51. 2N2646 is a unijunction transistor(UJT) in a TO-18 metal package. The control voltage or voltage proportional to error is fed to R56-Q3, The UJT drives a pulse transformer which provides isolation fro
m the Load which the SCR bridge is controlling. This phase angle control gives a near Linear closed loop control for a SCR bridge which may be used in Electroplating or a Preregulator of a big power supply. This is a Normally Closed PCB Mount SSR. That means when DC Control input is low, the triac is ON, the output passes the load current to turn on small heater-motor-lamp or a bigger contacter-drive etc.
When input DC is high the output is OFF. This is also Optically Isolated from Mains. A Microcontroller output which is buffered by some driver can drive this relay. It is better that in big systems these SSR Modules can be on another PCB, to avoid mains wiring near Logic circuits. But this cannot be used for medical electronics, or critical applications. More reliability Read More This is a AC Control Input AC Output SSR Solid State Relay. When a Process Controller has an AC output or a system generates an AC signal of above 100V AC to signal the load to turn on, this device can be used.
A BTA40-600 and MOC3041 are used in this. A high voltage plastic cap limits current to a bridge which generates a small DC from 230 V AC, this drives MOC3041. The rest is the same. It is better to use a DC control SSR where possible. This AC control SSR is used where only an AC control Read More This was a Fire Retardant Plastic Box which was made for the SSR I/O Stackable Modules.
DC Control for an AC Load. Usually it is to control another Big Three phase contactor; Pneumatic or Steam Valve, Solenoids-Motors. When Mounted at the end of the PCB it offers over 2kV Isolation from the Digital Circuits. The Output 230V signals NO-NC, can control Light Loads like the Coil of a Big 230V Relay also called contactor.
It could be Mounted on a PCB by soldering or a Plugin Base. It is better to have Crimped connections or Terminals. A very good quality Read More This is R-Y-B three phase 40A 440V AC Solid State Relay with 3-30 V DC Control Signal. It has Built in HeatSink and Fan. It is good for Controlling a Bank of heaters. This model could go upto 120A with SSR`s in parallel for Proportional Control. Solid State Relays SSR. This is a Contacter replacement, it will switch R-Y-B phases. It is a high power SSR. In some places it is unwise to use an SSR, a Electromechanical Contacter will perform better. The merit of SSR is fast switching, no wear and tear. No dust humidity influence. This post was Read More This is a DC controlled Solid State Relay which can turn 230V AC equipment on and off.
The output is like a NO normally open contacts of a relay and have to be in series with the Load like any other switch. This should not be used for large inductive loads like big motors. The Q1 transistor limits the current thru the LED by providing an alternate path for more current. The DC input can be from 3V to 20V. The Triac can be chosen depending on current in the load. Look for datasheets and applications at STMicroelectronics for BTA41600 Read More This is a phase angle control of a Triac which is a evolution from an SCR.
The 50 Hz or 60 Hz Sine wave of mains can be turned on at any point after the Zero Crossing The Voltage ramps up in the sine wave which gives a near Linear slope which can be used to trigger the ON at a time delay after zero crossing when the voltage is zero. This is like a PWM but works on low frequency only. Some of the early SMPS(HV for TV and Mains Inverter) by Siemens were built around SCRs. Turning off Read More 🔗 External reference
This is an AC control input, AC output SSR solid-state relay. When a process controller has an AC output or a system generates an AC signal above 100V AC to signal the load to turn on, this device can be employed. A BTA40-600 and MOC3041 are utilized in this configuration. A high-voltage plastic capacitor limits current to a bridge that generates a small DC from 230V AC, which drives the MOC3041. The remainder of the circuit operates similarly. It is preferable to use a DC control SSR when feasible. This AC control SSR is applied where only an AC control signal is available.
The SSR is housed in a fire-retardant plastic enclosure designed for stackable I/O modules. The DC control is intended for AC loads, typically to control a larger three-phase contactor, pneumatic or steam valves, solenoids, or motors. When mounted at the end of the PCB, it provides over 2kV isolation from digital circuits. The output 230V signals can be normally open (NO) or normally closed (NC) and can control light loads such as the coil of a large 230V relay, also known as a contactor. It can be mounted on a PCB by soldering or using a plugin base, with crimped connections or terminals recommended for better reliability.
This configuration describes an R-Y-B three-phase 40A 440V AC solid-state relay with a 3-30V DC control signal. It features a built-in heat sink and fan, making it suitable for controlling a bank of heaters. This model can accommodate up to 120A with multiple SSRs used in parallel for proportional control. Solid state relays (SSR) serve as a replacement for contactors, capable of switching R-Y-B phases. Although SSRs provide fast switching, zero wear and tear, and immunity to dust and humidity, there are situations where electromechanical contactors may perform better.
This is a DC-controlled solid-state relay capable of turning 230V AC equipment on and off. The output functions similarly to normally open contacts of a relay and must be connected in series with the load like any other switch. Caution should be exercised as this relay is not intended for large inductive loads such as large motors. The Q1 transistor limits current through the LED by providing an alternate path for additional current. The DC input can range from 3V to 20V, and the triac should be selected based on the current requirements of the load. Reference datasheets and applications from STMicroelectronics for the BTA41600 for further information.
This configuration employs phase angle control of a triac, which is an evolution of an SCR. The 50Hz or 60Hz sine wave from the mains can be triggered at any point after the zero crossing. The voltage ramps up in the sine wave, creating a near-linear slope that can be used to initiate the ON state with a delay after the zero crossing, when the voltage is zero. This method resembles pulse-width modulation (PWM) but operates only at low frequencies. Early switched-mode power supplies (SMPS) for televisions and mains inverters developed by Siemens were built around SCRs.A Center tap 50Hz Step Down Transformer with two diodes is used to get a train of Positive Sine Pulses at 100Hz which is applied to Q6 base via R51. 2N2646 is a unijunction transistor(UJT) in a TO-18 metal package. The control voltage or voltage proportional to error is fed to R56-Q3, The UJT drives a pulse transformer which provides isolation fro
m the Load which the SCR bridge is controlling. This phase angle control gives a near Linear closed loop control for a SCR bridge which may be used in Electroplating or a Preregulator of a big power supply. This is a Normally Closed PCB Mount SSR. That means when DC Control input is low, the triac is ON, the output passes the load current to turn on small heater-motor-lamp or a bigger contacter-drive etc.
When input DC is high the output is OFF. This is also Optically Isolated from Mains. A Microcontroller output which is buffered by some driver can drive this relay. It is better that in big systems these SSR Modules can be on another PCB, to avoid mains wiring near Logic circuits. But this cannot be used for medical electronics, or critical applications. More reliability Read More This is a AC Control Input AC Output SSR Solid State Relay. When a Process Controller has an AC output or a system generates an AC signal of above 100V AC to signal the load to turn on, this device can be used.
A BTA40-600 and MOC3041 are used in this. A high voltage plastic cap limits current to a bridge which generates a small DC from 230 V AC, this drives MOC3041. The rest is the same. It is better to use a DC control SSR where possible. This AC control SSR is used where only an AC control Read More This was a Fire Retardant Plastic Box which was made for the SSR I/O Stackable Modules.
DC Control for an AC Load. Usually it is to control another Big Three phase contactor; Pneumatic or Steam Valve, Solenoids-Motors. When Mounted at the end of the PCB it offers over 2kV Isolation from the Digital Circuits. The Output 230V signals NO-NC, can control Light Loads like the Coil of a Big 230V Relay also called contactor.
It could be Mounted on a PCB by soldering or a Plugin Base. It is better to have Crimped connections or Terminals. A very good quality Read More This is R-Y-B three phase 40A 440V AC Solid State Relay with 3-30 V DC Control Signal. It has Built in HeatSink and Fan. It is good for Controlling a Bank of heaters. This model could go upto 120A with SSR`s in parallel for Proportional Control. Solid State Relays SSR. This is a Contacter replacement, it will switch R-Y-B phases. It is a high power SSR. In some places it is unwise to use an SSR, a Electromechanical Contacter will perform better. The merit of SSR is fast switching, no wear and tear. No dust humidity influence. This post was Read More This is a DC controlled Solid State Relay which can turn 230V AC equipment on and off.
The output is like a NO normally open contacts of a relay and have to be in series with the Load like any other switch. This should not be used for large inductive loads like big motors. The Q1 transistor limits the current thru the LED by providing an alternate path for more current. The DC input can be from 3V to 20V. The Triac can be chosen depending on current in the load. Look for datasheets and applications at STMicroelectronics for BTA41600 Read More This is a phase angle control of a Triac which is a evolution from an SCR.
The 50 Hz or 60 Hz Sine wave of mains can be turned on at any point after the Zero Crossing The Voltage ramps up in the sine wave which gives a near Linear slope which can be used to trigger the ON at a time delay after zero crossing when the voltage is zero. This is like a PWM but works on low frequency only. Some of the early SMPS(HV for TV and Mains Inverter) by Siemens were built around SCRs. Turning off Read More 🔗 External reference