Parameters[edit][icon] This section

Parameters[edit]
[icon] This section requires expansion. (September 2010)
SSRs are characterised by a number of parameters including the required activating input voltage, current, output voltage and current, whether it is AC or DC, voltage drop or resistance affecting output current, thermal resistance, and thermal and electrical parameters for safe operating area (e.g., derating according to thermal resistance when repeatedly switching large currents).

Advantages over mechanical relays[edit]
Most of the relative advantages of solid state and electromechanical relays are common to all solid-state as against electromechanical devices.

Slimmer profile, allowing tighter packing.
Totally silent operation
SSRs are faster than electromechanical relays; their switching time is dependent on the time needed to power the LED on and off, of the order of microseconds to milliseconds
Increased lifetime, even if it is activated many times, as there are no moving parts to wear and no contacts to pit or build up carbon
Output resistance remains constant regardless of amount of use
Clean, bounceless operation
No sparking, allows it to be used in explosive environments, where it is critical that no spark is generated during switching
Inherently smaller than a mechanical relay of similar specification (if desired may have the same "casing" form factor for interchangeability).
Much less sensitive to storage and operating environment factors such as mechanical shock, vibration, humidity, and external magnetic fields.
Disadvantages[edit]
Voltage/current characteristic of semiconductor rather than mechanical contacts:
When closed, higher resistance (generating heat), and increased electrical noise
When open, lower resistance, and reverse leakage current (typically µA range)
Voltage/current characteristic is not linear (not purely resistive), distorting switched waveforms to some extent. An electromechanical relay has the low ohmic (linear) resistance of the associated mechanical switch when activated, and the exceedingly high resistance of the air gap and insulating materials when open.
Some types have polarity-sensitive output circuits. Electromechanical relays are not affected by polarity.
Possibility of spurious switching due to voltage transients (due to much faster switching than mechanical relay)
Isolated bias supply required for gate charge circuit
Higher transient reverse recovery time (Trr) due to the presence of the body diode
Tendency to fail "shorted" on their outputs, while electromechanical relay contacts tend to fail "open".

Kết quả (Anh) 1:

Parameters [edit][icon] This section requires expansion. (September 2010)SSRS are characterised by a number of parameters including the required-activating input voltage, current, output voltage and current, whether it is AC or DC, the voltage drop or resistance affecting output current, thermal resistance, and thermal and electrical parameters for safe operating area (e.g., derating according to thermal resistance when repeatedly switching large currents).Advantages over mechanical relays [edit]Most of the relative advantages of solid state and electromechanical relays are common to all solid-state as against electromechanical devices.Slimmer profile, allowing tighter packing.Totally silent operationSSRS are faster than electromechanical relays; their switching time is dependent on the time needed to power the LED on and off, of the order of microseconds to millisecondsIncreased lifetime, even if it is activated many times, as there are no moving parts to wear and no contacts to pit or build up carbonOutput resistance remains constant regardless of amount of useClean, bounceless operationNo sparking, allows it to be used in explosive environments, where it is critical that no spark is generated during switchingInherently smaller than a mechanical relay of similar specification (if desired may have the same "casing" form factor for interchangeability).Much less sensitive to storage and operating environment factors such as mechanical shock, vibration, humidity, and external magnetic fields.Disadvantages [edit]Voltage/current characteristic of semiconductor rather than mechanical contacts:When closed, the higher resistance (generating heat), and increased electrical noiseWhen open, the lower resistance, and reverse leakage current (typically µA range)Voltage/current characteristic is not linear (not purely resistive), distorting switched waveforms to some extent. An electromechanical relay has the low ohmic (linear) resistance of the associated mechanical switch when activated, and the exceedingly high resistance of the air gap and insulating materials when open.Some types have polarity-sensitive output circuits. Electromechanical relays are not affected by polarity.Possibility of spurious switching due to voltage transients (due to much faster switching than mechanical relay)Isolated bias supply required for gate charge circuitHigher transient reverse recovery time (Trr) due to the presence of the body diodeTendency to fail "shorted" on their outputs, while electromechanical relay contacts tend to fail "open".

Kết quả (Anh) 2:

Parameters [edit]
[icon] This section requires expansion. (September 2010)
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