<p>电磁蜂鸣器是利用内置的电磁线圈中流过的电流来驱动的，而压电声音元件是利用外加于压电陶瓷的电压来驱动的，因此与电磁蜂鸣器相比，具有消耗电流极小的特点。</p>
<p>压电扩音器（他励型）的消耗电流（外围电路部分除外），可以根据以下理论公式简略求得：</p>
<h3><strong>电流平均值 （理论值）</strong> </h3>
<p>压电扩音器（他励型）的充放电时间充分短于输入信号的1个周期长度时，压电扩音器（他励型）中流过的1/2周期间的电流平均值，可以根据以下公式求得：</p>
<img alt="消耗电流" data-align="center" data-entity-type="file" data-entity-uuid="a7e34ce7-f419-4b00-a1f8-5f8718ac1d97" src="/sites/default/files/inline-images/%E5%85%AC%E5%BC%8F_0.PNG" />
<h3><strong>各种型号的消耗电流计算值</strong></h3>
<p>根据上述公式按型号计算的压电扩音器（他励型）的电流平均值如下表所示：</p>
<table border="1">
<thead>
<tr>
<th rowspan="3">品名</th>
<th colspan="3">
<div>消耗电流 [mA]</div>
</th>
<th rowspan="3">驱动频率<br />
[kHz]</th>
<th rowspan="3">静电容量<br />
[nF]</th>
</tr>
<tr>
<th colspan="3">驱动电压（方波）</th>
</tr>
<tr>
<th>3 Vo-p</th>
<th>5 Vo-p</th>
<th>12 Vo-p</th>
</tr>
</thead>
<tbody>
<tr>
<td>PKMCS1818E20A0-R1</td>
<td>0.4</td>
<td>0.7</td>
<td>1.8</td>
<td>2</td>
<td>37</td>
</tr>
<tr>
<td>PKMCS0909E4000-R1</td>
<td>0.3</td>
<td>0.4</td>
<td>0.9</td>
<td>4</td>
<td>9</td>
</tr>
<tr>
<td>PKLCS1212E4001-R1</td>
<td>0.5</td>
<td>0.8</td>
<td>1.9</td>
<td>4</td>
<td>19.5</td>
</tr>
<tr>
<td>PKLCS1212E40A1-R1</td>
<td>0.5</td>
<td>0.8</td>
<td>1.9</td>
<td>4</td>
<td>19.5</td>
</tr>
<tr>
<td>PKLCS1212E2000-R1</td>
<td>0.3</td>
<td>0.6</td>
<td>1.3</td>
<td>2</td>
<td>28</td>
</tr>
<tr>
<td>PKLCS1212E20A0-R1</td>
<td>0.3</td>
<td>0.6</td>
<td>1.3</td>
<td>2</td>
<td>28</td>
</tr>
<tr>
<td>PKLCS1212E2400-R1</td>
<td>0.4</td>
<td>0.7</td>
<td>1.6</td>
<td>2.4</td>
<td>28</td>
</tr>
<tr>
<td>PKLCS1212E24A0-R1</td>
<td>0.4</td>
<td>0.7</td>
<td>1.6</td>
<td>2.4</td>
<td>28</td>
</tr>
<tr>
<td>PKM13EPYH4000-A0</td>
<td>0.1</td>
<td>0.2</td>
<td>0.5</td>
<td>4</td>
<td>5.5</td>
</tr>
<tr>
<td>PKM13EPYH4002-B0</td>
<td>0.1</td>
<td>0.2</td>
<td>0.5</td>
<td>4</td>
<td>5.5</td>
</tr>
<tr>
<td>PKM17EPP-2002-B0</td>
<td>0.4</td>
<td>0.7</td>
<td>1.6</td>
<td>2</td>
<td>34</td>
</tr>
<tr>
<td>PKM17EPPH4001-B0</td>
<td>0.3</td>
<td>0.3</td>
<td>0.7</td>
<td>4</td>
<td>7</td>
</tr>
<tr>
<td>PKM17EPPH4002-B0</td>
<td>0.2</td>
<td>0.3</td>
<td>0.7</td>
<td>4</td>
<td>7</td>
</tr>
<tr>
<td>PKM22EPH2001</td>
<td>0.2</td>
<td>0.3</td>
<td>0.8</td>
<td>2</td>
<td>17</td>
</tr>
<tr>
<td>PKM22EPH2002</td>
<td>0.2</td>
<td>0.3</td>
<td>0.8</td>
<td>2</td>
<td>17</td>
</tr>
<tr>
<td>PKM22EPH2003</td>
<td>0.2</td>
<td>0.3</td>
<td>0.8</td>
<td>2</td>
<td>17</td>
</tr>
<tr>
<td>PKM22EPPH2001-B0</td>
<td>0.2</td>
<td>0.4</td>
<td>0.9</td>
<td>2</td>
<td>19</td>
</tr>
<tr>
<td>PKM22EPPH2002-B0</td>
<td>0.2</td>
<td>0.4</td>
<td>0.9</td>
<td>2</td>
<td>19</td>
</tr>
<tr>
<td>PKM22EPPH4001-B0</td>
<td>0.3</td>
<td>0.5</td>
<td>1.2</td>
<td>4</td>
<td>12</td>
</tr>
<tr>
<td>PKM22EPPH4002-B0</td>
<td>0.3</td>
<td>0.5</td>
<td>1.2</td>
<td>4</td>
<td>12</td>
</tr>
<tr>
<td>PKM22EPPH4005-B0</td>
<td>0.3</td>
<td>0.5</td>
<td>1.2</td>
<td>4</td>
<td>12</td>
</tr>
<tr>
<td>PKM22EPPH4007-B0</td>
<td>0.3</td>
<td>0.5</td>
<td>1.2</td>
<td>4</td>
<td>12</td>
</tr>
<tr>
<td>PKM22EPPH4012-B0</td>
<td>0.3</td>
<td>0.5</td>
<td>1.2</td>
<td>4</td>
<td>12</td>
</tr>
<tr>
<td>PKM22EPTH2001-B0</td>
<td>0.2</td>
<td>0.4</td>
<td>0.9</td>
<td>2</td>
<td>19</td>
</tr>
<tr>
<td>PKM34EWH1101C</td>
<td>0.3</td>
<td>0.4</td>
<td>1.1</td>
<td>1.1</td>
<td>40</td>
</tr>
<tr>
<td>PKM34EWH1201C</td>
<td>0.2</td>
<td>0.4</td>
<td>0.9</td>
<td>1.2</td>
<td>32</td>
</tr>
<tr>
<td>PKM44EWH1001C</td>
<td>0.4</td>
<td>0.7</td>
<td>1.6</td>
<td>1</td>
<td>68</td>
</tr>
</tbody>
</table>
<p><font color="#FD8900">* 静电容量为中心值，公差为±30%，PKMCS和PKLCS为参考值。</font></p>
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