LED driver with silicon controlled dimmer, circuit module and control method thereof
First Claim
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1. An apparatus, comprising:
- a) a bleeder circuit coupled to a DC bus of a light-emitting diode (LED) driver having a silicon-controlled dimmer, wherein said bleeder circuit is controlled to discharge a current of said DC bus;
b) a controller configured to control said bleeder circuit to discharge said DC bus at a first current after detecting a transition in a voltage of said DC bus; and
c) said controller being configured to control said bleeder circuit to discharge said DC bus at a second current until said DC bus voltage rises to a predetermined load driving voltage, wherein said second current is less than said first current.
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Abstract
An apparatus can include: a bleeder circuit coupled to a DC bus of an LED driver having a silicon-controlled dimmer, where the bleeder circuit is controlled to discharge a current of the DC bus; a controller configured to control the bleeder circuit to discharge the DC bus at a first current after detecting a transition in a voltage of the DC bus; and the controller being configured to control the bleeder circuit to discharge the DC bus at a second current until the DC bus voltage rises to a predetermined load driving voltage, where the second current is less than the first current.
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Citations
20 Claims
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1. An apparatus, comprising:
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a) a bleeder circuit coupled to a DC bus of a light-emitting diode (LED) driver having a silicon-controlled dimmer, wherein said bleeder circuit is controlled to discharge a current of said DC bus; b) a controller configured to control said bleeder circuit to discharge said DC bus at a first current after detecting a transition in a voltage of said DC bus; and c) said controller being configured to control said bleeder circuit to discharge said DC bus at a second current until said DC bus voltage rises to a predetermined load driving voltage, wherein said second current is less than said first current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of controlling a bleeder circuit coupled to a DC bus of a light-emitting diode (LED) driver having a silicon-controlled dimmer, the method comprising:
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a) controlling said bleeder circuit to discharge said DC bus at a first current after detecting a transition in a voltage of said DC bus; and b) controlling said bleeder circuit to discharge said DC bus at a second current until said DC bus voltage rises to a predetermined load driving voltage, wherein said second current is less than said first current. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification