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	<title>电子电路 &#8211; Simon</title>
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	<title>电子电路 &#8211; Simon</title>
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		<title>N型MOSFET电荷泵驱动电路</title>
		<link>https://www.luisimon.com/2024/11/09/923/</link>
		
		<dc:creator><![CDATA[Alan]]></dc:creator>
		<pubDate>Sat, 09 Nov 2024 15:03:14 +0000</pubDate>
				<category><![CDATA[电子电路]]></category>
		<category><![CDATA[MOSFETT]]></category>
		<category><![CDATA[T12]]></category>
		<category><![CDATA[电荷泵]]></category>
		<guid isPermaLink="false">https://www.luisimon.com/?p=923</guid>

					<description><![CDATA[前言：众所周知，MOSFET为“电压驱动”型器件，以N-MOS为例，VGS电压与RDS(on)成反比。即驱动N ... <a title="N型MOSFET电荷泵驱动电路" class="read-more" href="https://www.luisimon.com/2024/11/09/923/" aria-label="继续阅读N型MOSFET电荷泵驱动电路">阅读更多</a>]]></description>
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<p><strong>前言：众所周知，MOSFET为“电压驱动”型器件，以N-MOS为例，V<sub>GS</sub>电压与R<sub>DS(on)</sub>成反比。即驱动N-MOS时<strong>V<sub>GS</sub></strong>尽可能最大。</strong></p>


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<figure class="aligncenter size-full"><img fetchpriority="high" decoding="async" width="534" height="287" src="https://www.luisimon.com/wp-content/uploads/2024/10/ChargePump.jpg" alt="" class="wp-image-925" srcset="https://www.luisimon.com/wp-content/uploads/2024/10/ChargePump.jpg 534w, https://www.luisimon.com/wp-content/uploads/2024/10/ChargePump-300x161.jpg 300w" sizes="(max-width: 534px) 100vw, 534px" /><figcaption class="wp-element-caption">N-MOSFET &amp; Charge Pump（测试电路，电阻R13不是必须的）</figcaption></figure></div>


<p>首先讲清楚此电路的具体是用于控制T12烙铁，其中P+是接T12烙铁正极。</p>



<p>电荷泵组成器件分别是：D2、D3、C4，此三个器件构成的电荷泵可以使N沟道的MOS作为上管使用。</p>



<p>即是Q2导通，MOS关断时，电源通过D3、C4以及烙铁构成回路并在此时为C4充电至电源电压。在Q2关断时，MOS导通，由于MOS导通后电阻极小（T12烙铁≈8Ω），使得B点电压迅速抬升（接近电源电压），C4在此时发挥作用，由于C4负极在B点，C4电压满足MOS的V<sub>GS</sub>最小要求，向G极提供电流，MOS稳定导通。</p>



<p>解释：D3的作用使防止MOS导通时，C4通过MOS流回B点而放电。D2主要起到钳位作用保护MOS的G极（V<sub>GS</sub>最高耐压20V）。</p>



<p class="has-text-color has-link-color wp-elements-1a88632bc5a1b55ce5a7b6597637164a" style="color:#919ca5"><em>其他：A、B电压约为18V，A对地电压约为 电源电压+18V。</em></p>



<p><a href="https://www.luisimon.com/goto/litp" rel="nofollow" data-type="link" data-id="https://github.com/wagiminator/ATmega-Soldering-Station">T12项目参考自德国网友GitHub</a></p>
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