Starting device for a cdm lamp and starting method for the same

A starting method for a CDM lamp, wherein the starting method is applied to a starting device for the CDM lamp, the starting device comprises a full bridge inverter connected to the CDM lamp, a driving circuit, a single-chip microcomputer and an ignition determining module;

• characterized in that
• the starting method specifically comprises steps below:
• S100:
• when the starting device is powered up, detecting whether a DC input voltage is present at an input side of the full-bridge inverter;
• if not, determining that the input side of the full-bridge inverter is abnormal;
• if present, proceeding to next step;
• S200:
• if the DC input voltage is present at the input side of the full-bridge inverter, the driving circuit being controlled by the single-chip microcomputer;
• within a set time length T0, continuously outputting, according to a certain set period, pulse of the period, so that the full-bridge inverter provides output to the CDM lamp;
• S300:
• determining, by the ignition determining module, whether the output provided by the full-bridge inverter within the time length T0 successfully ignites the CDM lamp, and outputting, by the ignition determining module, a result of the determining to the single-chip microcomputer;
• S400:
• if the single-chip microcomputer knows that the ignition succeeds through the step S300, controlling, by the single-chip microcomputer the driving circuit to regulate the output of the full-bridge inverter, so that the CDM lamp enters into a normal working state from a starting state;
• S500:
• if the single-chip microcomputer knows that the ignition failed through the step S300 and the DC input voltage is still present at the input side of the full-bridge inverter, the drive circuit being still controlled by the single-chip microcomputer;
• changing the previously set period, and continuously outputting, according to the changed set period within the time length T0, pulse of the period, so that the full-bridge inverter provides a new output to the CDM lamp;
• then, continuing to execute step S300;
• if the ignition determining module still determines that the ignition failed, executing step S600;
• otherwise, jumping to step S400;
• S600:
• accumulating the time length T0 in the executed step S500 and the time length T0 in the executed step S200, and determining whether the accumulated time length has exceeded a preset total time length T;
• if not, iteratively executing the step S500;
• otherwise, switching off pulse output of the driving circuit, confirming that a starting time-out fault is present, and transmitting an alert of starting time-out fault to the single-chip microcomputer.