Wednesday, December 29, 2010

【 Weak current College 】 SCR's main parameters 】



1. the average on-State current rating IT under certain conditions, cathode-anode---can be continuous through between the 50 Hz sine-wave current average.

2. forward blocking peak voltage VPF in control-drain without anode trigger signal, the forward voltage is not above Guide to voltage, you can repeat the SCR on both ends of the positive peak voltage. SCR bear forward voltage peak value, cannot exceed manual for this parameter value.

3. reverse Yin off peak voltage VPR when SCR with reverse voltage that is in reverse off-State, you can duplicate and reverse the SCR peak voltage at both ends. When used, must not exceed manual for this parameter value.

4. control extremely triggering current VGT Ig1, trigger voltage specified ambient temperature, the anode---cathode between a certain voltage, SCR from the off State to on-State the required minimum control current and voltage.

5. maintain the current provisions of IH in temperatures, the control SCR polar circuit breaker, maintain continuity required minimum anode forward current.

In recent years, many have come out TRIAC components, such as suitable for high frequency applications fast thyristor, can be positive or negative trigger signal control both directions on the TRIAC that can be used as the trigger signal so that it is conducting, with negative trigger signal to turn-off of SCR and so on.

SCR

SCR is silicon controlled Rectifier elements, also known as SCR for short. Has the volume small, the structure is relatively simple, powerful, and other characteristics, is the more popular one of semiconductor devices. The devices are widely used in various electronics and electronic products, the number used to make controlled rectifier, inverter, frequency, voltage regulation, non-contact switches, etc. Household appliances of dimming lights, speed fans, air conditioners, television sets, refrigerators, washing machines, cameras, phonograph, acousto-optic circuits, timing controller, toys, radio remote control, video camera and industrial control, etc., are all significant use of a silicon devices.

SCR's classification

According to its characteristics, SCR (THYRISTOR) can be divided into ordinary Silicon controlled rectifier (SCR) is unidirectional, bidirectional, Silicon controlled rectifier (TRIAC) and other special silicon.

Thyristor trigger

Zero-crossing trigger-General is power, that is, when the AC voltage phase alternating current zero-crossing trigger, you must be over the zero point is triggered, conduction Silicon.

Non-zero-crossing trigger-no matter what the AC voltage in the phase of time can be triggered via SCR, common is shifting trigger through the main parameters of the TRIAC
1. the average on-State current rating IT under certain conditions, cathode-anode---can be continuous through between the 50 Hz sine-wave current average.

2. forward blocking peak voltage VPF in control-drain without anode trigger signal, the forward voltage is not above Guide to voltage, you can repeat the SCR on both ends of the positive peak voltage. SCR bear forward voltage peak value, cannot exceed manual for this parameter value.

3. reverse Yin off peak voltage VPR when SCR with reverse voltage that is in reverse off-State, you can duplicate and reverse the SCR peak voltage at both ends. When used, must not exceed manual for this parameter value.

4. control extremely triggering current VGT Ig1, trigger voltage specified ambient temperature, the anode---cathode between a certain voltage, SCR from the off State to on-State the required minimum control current and voltage.

5. maintain the current provisions of IH in temperatures, the control SCR polar circuit breaker, maintain continuity required minimum anode forward current.

In recent years, many have come out TRIAC components, such as suitable for high frequency applications fast thyristor, can be positiveor negative trigger signal control both directions on the TRIAC that can be used as the trigger signal so that it is conducting, with negative trigger signal to turn-off of SCR and so on.

SCR

SCR is silicon controlled Rectifier elements, also known as SCR for short. Has the volume small, the structure is relatively simple, powerful, and other characteristics, is the more popular one of semiconductor devices. The devices are widely used in various electronics and electronic products, the number used to make controlled rectifier, inverter, frequency, voltage regulation, non-contact switches, etc. Household appliances of dimming lights, speed fans, air conditioners, television sets, refrigerators, washing machines, cameras, phonograph, acousto-optic circuits, timing controller, toys, radio remote control, video camera and industrial control, etc., are all significant use of a silicon devices.

SCR's classification

According to its characteristics, SCR (THYRISTOR) can be divided into ordinary Silicon controlled rectifier (SCR) is unidirectional, bidirectional, Silicon controlled rectifier (TRIAC) and other special silicon.

Thyristor trigger

Zero-crossing trigger-General is power, that is, when the AC voltage phase alternating current zero-crossing trigger, you must be over the zero point is triggered, conduction Silicon.

Non-zero-crossing trigger-no matter what the AC voltage in the phase of time can be triggered via SCR, common is shifting trigger, namely by changing alternating breakover angle (angle phase), to change the output percentage.

The main parameters of the TRIAC

The main parameters of the TRIAC: 1 rated on-State current (IT) is the most stable operating current, commonly known as current. Commonly used silicon it generally is a a few decades. 2 repetitive peak reverse voltage (VRRM) or repetitive peak off-state voltage (VDRM), commonly known as the pressure resistance. Commonly used silicon of VRRM/VDRM typically several hundred volts into a 110kv. 3 control extremely triggering current (IGT), commonly known as trigger current. Commonly used silicon of IGT generally few µA to dozens of Ma.

SCR's common packageR>
Commonly used silicon package form TO-92, TO-126, TO-202AB, TO-220, TO-220AB, TO-3P, TO-252 SOT-89, TO-251, etc. Change the alternating breakover angle (angle phase), to change the output percentage.

The main parameters of the TRIAC

The main parameters of the TRIAC: 1 rated on-State current (IT) is the most stable operating current, commonly known as current. Commonly used silicon it generally is a a few decades. 2 repetitive peak reverse voltage (VRRM) or repetitive peak off-state voltage (VDRM), commonly known as the pressure resistance. Commonly used silicon of VRRM/VDRM typically several hundred volts into a 110kv. 3 control extremely triggering current (IGT), commonly known as trigger current. Commonly used silicon of IGT generally few µA to dozens of Ma.

SCR's common package

Commonly used silicon package form TO-92, TO-126, TO-202AB, TO-220, TO-220AB, TO-3P, TO-252 SOT-89, TO-251, etc.


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