| 摘要 |
<p>The present invention discloses electronic ballast with lifetime end protection, including rectifying filtering circuit, direct current/alternate current inversion circuit, and resonating circuit. The input end of rectifying filtering circuit connects the power supply, the output end of rectifying filtering circuit connects the input end of direct current/alternate current inversion circuit, the output end of direct current/alternate current inversion circuit connects the input end of resonating circuit, and the output end of resonating circuit connects the strip lamp. The electronic ballast also includes feedback drive circuit and filament current loop; the input end of filament current loop connects the strip lamp; the input end of feedback drive circuit connects the filament current loop, and the output end connects the control end of direct current/alternate current inversion circuit; the electrical signal of filament current loop controls the direct current/alternate current inversion circuit to drive the resonating circuit via the feedback drive circuit, when the filament broken, the contact of the filament capacitance with the strip lamp is interrupted, so feedback driving is also ceased, the direct current/alternate current inversion circuit has lost driving power, then the system stops working, and the behavior of lifetime end protection is achieved.</p> |
