Patent ID: 9072151
Filing Date: 2015-06-30
Classification: H05B

Abstract:
1. A high intensity discharge electronic ballast circuit, comprising: a trigger circuit, a power half-bridge self-excited oscillation circuit having an input terminal coupled with an output terminal of the trigger circuit, arranged to enable self-excited oscillation by energizing an angle capacitor (C a filter loop having an input terminal coupled with an output terminal of the power half-bridge self-excited oscillation circuit and an output terminal connected with a load HID lamp tube, arranged to match impedance for the self-excited oscillation signals, thereby converting a low-impedance voltage source to a high-impedance constant current source; and an abnormal protection circuit which has an input terminal coupled with an inducting electrical source terminal of the filter loop, and a control terminal coupled with an abnormal control terminal of the power half-bridge self-excited oscillation circuit, thereby enforcing to break the power half-bridge self-excited oscillation circuit when an anomaly is generated, so as to protect the high intensity discharge electronic ballast circuit.