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引用 IEC/ EN 60335-1 標準中第5章節 (測試的通用條件) 的5.13條 :! Y6 z3 {5 j2 e) b+ S
5.13 The tests for appliances with PTC heating elements and for heating appliances and combined appliances where the heating elements are supplied via a switch mode power supply are carried out at a voltage corresponding to the specified power input. 0 I6 N3 t, z" q: m( E
; a0 k5 b0 _' c' \& L0 [When a power input greater than the rated power input is specified, the factor for multiplying the voltage is equal to the square root of the factor for multiplying the power input.
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(1. 第一句话“通過開關模式供電的带PTC电热元件的發熱器具和組合器具,在与规定的输入功率相对应的电压下进行试验"
: s: v4 _+ B& y! v这句话是说,PTC电热元件跟隨电压來做测试,然后这个电压是怎么来的呢? 是跟规定的输入功率相对应。 6 A* ?6 M8 g/ T
3 u0 U- d3 B! u0 Q0 w# t规定的输入功率是什么意思?指的是标准里提到测试时规定的输入功率。 比如: N0 Y2 X/ W' b7 L, w, |
正常温升测试时,标准提到1.15倍额定输入功率作为测试条件;
7 h6 [* `: w2 [8 P11.4 Heating appliances are operated under normal operation and at 1,15 times rated power input. : t u6 Z$ S+ [ o" n$ g
非正常测试时,標準提到0.85倍额定输入功率,1.24倍额定输入功率作为测试条件; 6 n/ C8 @' J0 S8 n$ r
19.2 Appliances with heating elements are tested under the conditions specified in Clause 11 but with restricted heat dissipation. The supply voltage, determined prior to the test, is that required to provide a power input of 0,85 times rated power input under normal operation when the power input has stabilized. This voltage is maintained throughout the test. / S# R7 M6 O0 Y* |. U$ C
19.3 The test of 19.2 is repeated but with a supply voltage, determined prior to the test, equal to that required to provide a power input of 1,24 times rated power input under normal operation when the power input has stabilized. This voltage is maintained throughout the test. ! n. E' |) G; ^* C3 x' G
那么规定的输入功率指的就是这些1.15倍,0.85倍,1.24倍的额定输入功率。
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(2.測試电压又怎么和这些规定的输入功率相对应呢,看5.13的第二句话
- f" h: T2 J$ H$ y- h; I“当规定的输入功率大于额定功率时,用来乘电压的系数(此處系數為0.85/ 1.15 / 1.24等) 等于用来乘输入功率的系数的平方根”. B; d Z s& ]5 e
. V( b3 ?: T+ N1 @: s比如说在1.15(11章), 0.85(19.2章),1.24(19.3章)倍额定输入功率的测试条件下,规定的输入功率大于额定功率的情况,就是1.15倍,1.24倍时候的情况,0.85倍时候是规定的输入功率小于额定功率的情况。 2 d5 `: T, g- a1 k: l1 |
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那么在1.15倍额定输入功率条件的测试中(第11章提到的正常温升测试)
9 M3 r6 p) \5 w8 v3 hPTC器具的测试条件就是:(根號) √1.15 x 额定电压。
& ]2 @; E; w0 m3 O* a4 u假设额定电压为230v,那么这个测试的测试电压就是:√1.15x230=246.7V ,240V就是:√1.15x240=257.5V
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% y s% q; A( Y* E1.24倍额定输入功率条件的测试中(19.3提到的温升测试),同理推出。
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! @ f* z+ H ^4 w' [" q+ z; R那么规定的输入功率小于额定输入功率的情况,比如19.2章提到的0.85倍额定输入功率状态,那么可以直接在0.85倍功率对应的电压下面做测试(其实这个测试就没什么意义了,得到的结果还不如正常温升恶劣)。
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