Control circuit and control method for dimming LED lighting circuit
First Claim
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1. A control circuit for dimming LED lighting circuit, comprising:
- a voltage divider, receiving an input voltage from an input terminal to generate a dimming signal;
a controller, generating a switching signal in response to said dimming signal, wherein said controller further generates a control signal in response to said input voltage; and
an adaptive bleeder, receiving said control signal and drawing a bleeder current from said input terminal in response to said control signal.
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Abstract
The present invention provides a control circuit for dimming LED lighting. The control circuit comprises a voltage divider, a controller and an adaptive bleeder. The voltage divider receives an input voltage from an input terminal to generate a dimming signal. The controller generates a switching signal in response to the dimming signal. The controller further generates a control signal in response to the input voltage. The adaptive bleeder receives the control signal and draws a bleeder current from the input terminal in response to the control signal.
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19 Claims
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1. A control circuit for dimming LED lighting circuit, comprising:
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a voltage divider, receiving an input voltage from an input terminal to generate a dimming signal; a controller, generating a switching signal in response to said dimming signal, wherein said controller further generates a control signal in response to said input voltage; and an adaptive bleeder, receiving said control signal and drawing a bleeder current from said input terminal in response to said control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control method for dimming LED lighting circuit, comprising:
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generating a dimming signal by a voltage divider in response to an input voltage from an input terminal; generating a switching signal and a control signal by a controller in response to said dimming signal and said input voltage respectively; drawing a bleeder current from said input terminal by an adaptive bleeder in response to said control signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification