AC line transient voltage ruggedness

TS110-7

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DocID022271 Rev 4

2

AC line transient voltage ruggedness

In comparison with standard SCRs, the TS110-7 is self-protected against over-voltage. The

TS110-7 switch can safely withstand AC line surge voltages by switching to the on state (for

less than 10 ms on 50 Hz mains) to dissipate energy shocks through the load. The load

limits the current through the TS110-7. The self-protection against over-voltage is based on

an overvoltage crowbar technology. This safety feature works even with high turn-on current

ramp up.

Figure 15 represents the TS110-7 in a test environment. It is used to stress the TS110-7

switch according to the IEC 61000-4-5 standard conditions. The TS110-7 folds back safely

to the on state as shown in Figure 16.

The TS110-7 recovers its blocking voltage capability after the surge and the next zero

current crossing. Such a non repetitive test can be done at least 10 times.

Figure 15. Overvoltage ruggedness test circuit for IEC 61000-4-5 standards

Figure 16. Typical current and voltage waveforms across the TS110-7 during

IEC 61000-4-5 standard test

AC Mains

Filtering unit

Model of the load

Surge generator

60

Ω

60

Ω

12

Ω

47 nF

TS110

I

V

0

0

Vpeak =VBO

1.2/50 µs voltage surge

Ipeak = 25 A

dI/dt = 100 A/µs