请教，LCC测试时静态电路电容量测定

iec60950-1

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LCC电路测试时需确定电路的电容量，如何确定一个LCC电路的电容量？
1.当LCC电路频率小于1KHz时
. s% g! O) W4 a* s- w2.当LCC电路频率高于1KHz时
该如何确定电路的电容量？用LCR来测，如何选取合适的频率？
/ `( p- e9 H  O; F) C# ?8 ~' M根据最新的950-1标准，可以用附录D的网络来替换，这时是否还需要测定电路的等效电容量？

cylam128

我也想知道。

ajay

这个问题已经有CTL决议了。具体如下：

/ i3 G" T% m( ?) H/ B- A8 bQuestion:
When measuring the circuit capacitance according to clause 2.4, what frequency should be used, 1kHz, the measured frequency of the circuit or another frequency?
5 N% {7 E8 r3 `- k  ~4 d1 Q5 J
! ], J8 w* U3 a+ h' s' nProposal:

For frequencies not exceeding 1kHz, the circuit capacitance shall be measured at a frequency of 1kHz.
" \9 y7 V5 }3 S5 u9 c  R( d& q
For frequencies above 1kHz, the circuit capacitance shall be measured under the actual circuit frequency or the nearest frequency point of the measuring equipment.

9 Y8 j# M. p" ?! d2 p3 r, A* Y# YDecision:
LCC limit values per 2.4.2 typically are applied to two different types of circuits, those providing:
/ n" r/ A( @/ m6 e% c+ ]: I3 O(a) steady state current, or
6 M* D8 p0 a  r6 J$ s(b) capacitively driven current.

& D* T& v0 J' @& mIn a single product, one or multiple measurements may be required based on the type
of individual circuits involved.
+ m0 r5 |- R8 G8 ^/ F! |•    For circuits with steady state current of a single frequency, a measurement through a 2000 ohm resistor is conducted. There is no capacitance determination.

1 ]; o: [6 z7 B4 P0 {) D- `8 {3 V$ F•    For circuits with steady state current of multiple/complex frequencies, a measurement using one of the measurement instruments of Annex D is conducted. There is no capacitance determination.

$ m2 g1 p  u, Z  o1 o- R•    For a circuit with a capacitance driven current, such as found in a lamp driver circuit, where the current typically is driven by a ‘single’ capacitor, the circuit capacitance can be determined via either the marked nominal capacitor rating or measurement of the single capacitor via LCR measurement equipment. For circuits that have capacitance driven currents, there are no additional current measurements. It is purely a capacitance determination or measurement, with maximum capacitance defined per 2.4.2, based on the maximum Working Voltage of the circuit.
9 G- u3 [7 E! |' P8 \1 G
4 E, R% Z. j- G" p$ QExplanatory Notes:
The methodology stated above also will be included in IEC 62368, but in a different form.

7 E7 L, c- S7 H6 D, n$ o8 DWe also understand that most widely and commonly available LCR equipment is not intended to measure complex circuits/networks consisting of multiple L, C & R components in the same network. The equipment is designed to measure individual L, C or R components. Regardless, it is our contention that such measurements of complex circuits by LCR measuring equipment are not required by 2.4.2 of IEC 60950-1.