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AN1296

2/8

Doc ID 8159 Rev 3

1

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Three kinds of loads have been used during the tests.

●

Valve

●

Pump

●

Resistor rated at 5 W, 150

Ω

1.1

Valve

The valves used were rated for 120 V, 50 mA, 60 Hz operation. Two different types of

behavior can appear during ring wave test when using such valves.

●

The valve insulation is sufficient: when the ACS turns on, the current is limited by the

load inductor. Only a capacitive current (approximately 250 mA peak, see Figure 2) can

be seen during the rise of voltage across the switch. Such a turn on is not stressful for

the device.

Figure 2.

3 kV surge with a well insulated valve

Vout (200 V/div)

Iout (0.5 A/div)