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簡單的固態繼電器具有過零開關功能

發布日期：2022-10-21 點擊率：60

DQZHAN訊：簡單的固態繼電器具有過零開關功能

本設計實例是一個固態繼電器(SSR)，它能利用雙向晶閘管切換大電流的交流負載市場上有大量簡單的固態繼電器電路，但這個電路可能是*簡單的，它只在交流線路電壓接近零時才導通和關斷。


晶體管Q2作為鉗位器，在交流線路電壓大約高于15V時禁止晶閘管(SCR)門極驅動電壓輸出。在線路電壓低于該值時，由光耦控制SCR的門極。正向電流流入光耦LED，使電流能從整流后的交流線路流向SCR門極，將其導通。一旦SCR導通，就會有足夠的電流流經橋式整流器，使雙向SCR導通。


 

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