DC-DC converter having protective function of over-voltage...

Details DC-DC converter having protective function of over-voltage... DC-DC converter having protective function of over-voltage...

2008-04-15

2008-04-15

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Periodic-type current and/or voltage regulator in the supply...

C315S129000, C315S299000, C315S320000

Reexamination Certificate

active

07358685

ABSTRACT:
The invention relates to a DC-DC converter having over-current/over-voltage protection function and an LED driving circuit using the same. The DC-DC converter adjusts a width of a switching pulse outputted from a Pulse Width Modulation (PWM) controller to control on/off durations of a switch, thereby providing a controlled level of voltage to a load. The DC-DC converter includes a microcontroller for detecting a voltage, and if the detected voltage is greater than a reference voltage, generating an alarm signal. The DC-DC converter further includes a digital-analogue converter for outputting a voltage of 0V and an analogue dimmer for generating a control signal that changes an ‘on’ duration of the switching pulse outputted from the PWM controller to 0 and providing the control signal to the PWM controller.

REFERENCES:
patent: 5675485 (1997-10-01), Seong
patent: 5862044 (1999-01-01), Shioya et al.
patent: 6487059 (2002-11-01), Bontempo et al.

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