Led driver circuits
AssigneeAstec International Limited
InventorVijay G. Phadke
Life of this patent
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Abstract
A driver circuit for one or more LEDs includes a power circuit having an output terminal, a capacitor coupled to the output terminal and a switch, and a control circuit coupled to the power circuit for controlling the power circuit. The control circuit is configured to operate the switch for coupling a resistance in series with the capacitor in response to detecting an open circuit condition at the output terminal. Additionally, or alternatively, the driver circuit may include a switched mode power supply, and the control circuit may be configured to switch operation of the switched mode power supply from a current control mode to a voltage control mode, and reduce a current setting for the current control mode, in response to detecting an open circuit condition at the output terminal.
Claims20
A driver circuit for one or more LEDs, the driver circuit comprising:
- a power circuit having an output terminal, a capacitor coupled to the output terminal and a switch;
- and
- a control circuit coupled to the power circuit for controlling the power circuit, the control circuit configured to operate the switch for coupling a resistance in series with the capacitor in response to detecting an open circuit condition at the output terminal.
A driver circuit for one or more LEDs, the driver circuit comprising:
- a switched mode power supply having an output terminal;
- and
- a control circuit coupled to the switched mode power supply for controlling the switched mode power supply in a current control mode or a voltage control mode, the control circuit configured to switch operation from the current control mode to the voltage control mode, and reduce a current setting for the current control mode from a first current level to a second current level, in response to detecting an open circuit condition at the output terminal.
Dependencies are inferred from the claim text.