Experimental results

AN2835

18/21

Doc ID 15073 Rev 1

4.1

Test with HID lamp

The test was done at 220 Vac line input with a HID lamp at room temperature. The test lamp

is a powerball HCI-T 70W/830 WDL from OSRAM. Table 4 shows the test results. The input

power for the 70 W HID lamp is 76.4 W and the power factor achieved is 0.98.

The lamp current during start up is shown in Figure 21. The detail of warm-up current is

shown in Figure 22 and the steady-state current is shown in Figure 23.

Figure 21.

Lamp current during start up with HID lamp

Table 4.

Test results of power factor

Results

Conditions

Vin

Iin

Pin

PF

Volts

Amperes

Watts

~

220

0.347

76.4

0.98

Figure 22.

The lamp current in warm-up state

Figure 23.

The lamp current in steady-state

Vertical: lamp current 1 A/div

Horizontal: time 2 ms/div

Vertical: lamp current 1 A/div

Horizontal: time 2 ms/div