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| 型號(hào)： | AN1354 |
| 英文描述： | SINGLE-PHASE INDUCTION MOTOR DRIVE FOR REFRIGERATOR COMPRESSOR APPLICATION |
| 中文描述： | 單相異步電機(jī)驅(qū)動(dòng)的冷柜壓縮機(jī)的應(yīng)用 |
| 文件頁(yè)數(shù)： | 2/10頁(yè) |
| 文件大?。?/td> | 118K |
| 代理商： | AN1354 |
APPLICATION NOTE
2/10
A start capacitor is sometimes connected in series with this winding in place 1 (cf. Figures 1 and 2). It is im-
portant to note, even for the same motor, that this capacitor can be placed or removed, without disturbing
the motor operation.
When C is placed in Position 2 (split-phase capacitor), it always sinks a current, even when the PTC is hot
or when the START triac is OFF. This allows power factor improvement and power consumption reduction.
Infact,theCcapacitorwillbeaddediftherefrigeratororfreezerdoesnotreachtherequiredefficiencylevel
without it.
In the following study, we assume that C is always placed at Position 2, if present.
C
V
AC
1
PTC
2
T(°C) Klixon
Run ACST
Fig. 1: One-triac topology
C
V
AC
1
PTC
2
T(°C) Klixon
Run ACST
Start ACST
Fig. 2: Two-triac topology
2.2 Semiconductor rating
The start capacitor and the auxiliary winding form a resonant R-L-C circuit. The capacitor voltage can thus
be higher that the mains one. In practice the ratio between V
C
and Vac equals 1.1 to 1.5.
The worst case appears at the run triac turn-off, for both topologies. Indeed, V
C
is added to the mains volt-
ageuptothecapacitorcompletedischarge.Thisresultsinhighvoltagesacrosstheruntriac(cf.Figure3).
Even for a 220-240 V application, 700 V semiconductors must then be chosen.
2.2.1 Start-capacitor voltage
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