Operation principle
UM0575
6/20
1.3.2 ON
state
As soon as the mains voltage is applied:
●
M1 is OFF because the voltage drop across the PTC is not high enough to reach the
DZ1 clamping level
●
T2 is then turned on, thanks to the gate current provided by R2
●
T1 is turned on thanks to the gate current provided by T2
Both T1 and the PTC are then ON.
At each zero-current crossing point, the ACST6 turns off. The reapplied voltage across
T1/T2 triggers back T1 which results in some voltage spikes at each zero-current crossing
point (typically around 40 V as shown in
Figure 6
for a 230 V compressor).
Applying the click test of norm EN55014, the noise duration could last more than 200 ms
(depending on the type of compressor and PTC). The individual spikes last a few hundreds
of microseconds and are spaced at intervals of 10 ms, so the limits of continuous
disturbance are applicable. Since the spike peaks are less than 100 V, the e-STARTER
solution should fulfill the requirements of EN55014. It should be noted that tests results
greatly depend on the compressor used during the tests.
Figure 5.
e-STARTER schematics
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