Damper circuit for switched dimming
First Claim
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1. A circuit for use in a power converter, comprising:
- a damping resistance having a first terminal coupled to an output of a rectifier circuit, the damping resistance having a second terminal coupled to a first terminal of an input filter capacitor of the power converter, wherein a second terminal of the input filter capacitor is coupled to the output of the rectifier circuit;
a thyristor having a first terminal coupled to the first terminal of the damping resistance, the thyristor having a second terminal coupled to the second terminal of the damping resistance; and
an enable circuit including a first resistance and a first capacitor coupled between the first terminal of the thyristor and a second terminal of the input filter capacitor of the power converter, wherein a terminal coupled between the first resistance and the first capacitor of the enable circuit is coupled to a gate terminal of the thyristor to enable the thyristor in response to an input voltage of the power converter.
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Abstract
A power converter includes dimmer circuit, a rectifier circuit, and a thyristor damper circuit. The dimmer circuit provides a dimmer voltage in response to an input voltage. The rectifier circuit provides a rectified voltage in response to the dimmer voltage. The thyristor damper circuit dampens an input current associated with the rectified voltage based on the input current and ceases dampening the rectified voltage based on the rectified voltage.
14 Citations
20 Claims
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1. A circuit for use in a power converter, comprising:
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a damping resistance having a first terminal coupled to an output of a rectifier circuit, the damping resistance having a second terminal coupled to a first terminal of an input filter capacitor of the power converter, wherein a second terminal of the input filter capacitor is coupled to the output of the rectifier circuit; a thyristor having a first terminal coupled to the first terminal of the damping resistance, the thyristor having a second terminal coupled to the second terminal of the damping resistance; and an enable circuit including a first resistance and a first capacitor coupled between the first terminal of the thyristor and a second terminal of the input filter capacitor of the power converter, wherein a terminal coupled between the first resistance and the first capacitor of the enable circuit is coupled to a gate terminal of the thyristor to enable the thyristor in response to an input voltage of the power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A circuit for use in a power converter for a lighting system, comprising:
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a damper circuit coupled to an input of the power converter to dampen an input current of the power converter; a bypass enable circuit coupled to one end of the damper circuit and to receive an input voltage, wherein the bypass enable circuit is coupled to provide a bypass enable voltage in response to the input voltage reaching a voltage threshold; and a damper bypass circuit coupled across the damper circuit and coupled to receive the bypass enable voltage, wherein the damper bypass circuit is coupled to bypass the damper circuit in response to the bypass enable voltage to cause the damper circuit to cease damping the input current in response the input voltage reaching the voltage threshold. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A circuit for use in a power converter, comprising:
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a damping resistance coupled to an input of the power converter to dampen an input current of the power converter; a bypass circuit coupled across the damping resistance; and a bypass enable circuit coupled to the bypass circuit and to the input of the power converter, wherein the bypass enable circuit is coupled to enable and disable the bypass circuit coupled across the damping resistance in response to an input voltage coupled to the input of the power converter. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification