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Bleeder circuit for use in a power supply

A technology of bleeder circuit and current circuit, applied in the field of lighting system, can solve the problem of insufficient supply

Inactive Publication Date: 2013-10-30
POWER INTEGRATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low currents used by efficient power converters to drive LED lamps may not provide enough current to keep the TRIAC on for the expected portion of the ac line cycle

Method used

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  • Bleeder circuit for use in a power supply
  • Bleeder circuit for use in a power supply
  • Bleeder circuit for use in a power supply

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Embodiment Construction

[0039]In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the specific details need not be employed to practice the invention. In other instances, well-known materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0040] Reference throughout this specification to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described with respect to the embodiment or example is included In at least one embodiment of the invention. Thus, appearances of the phrases "in one embodiment," "in an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. . Furthermore, the particular features, structures or ch...

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Abstract

A bleeder circuit for use in a power supply of a lighting system includes a first terminal to be coupled to a first input of the power supply. A second terminal is to be coupled to a second input of the power supply. An edge detection circuit is coupled between the first and second terminals of the bleeder circuit. The edge detection circuit is coupled to output an edge detection signal in response to an input signal between the first and second inputs. A variable current circuit is coupled to the edge detection circuit and coupled between the first and second terminals of the bleeder circuit. The variable current circuit is coupled to conduct a bleeder current between the first and second terminals of the bleeder circuit in response to the edge detection signal.

Description

technical field [0001] The present invention generally relates to power supplies. More specifically, embodiments of the invention relate to lighting systems including dimming circuitry for use with a power supply. Background technique [0002] Electronic devices use electricity to function. Electricity is typically delivered through a wall outlet in the form of high voltage alternating current (ac). A device—commonly called a power converter or power supply—can be used in lighting systems to convert a high voltage ac input into a properly regulated direct current (dc) output through an energy transfer element. Switching power converters are commonly used to power many of today's electronic devices due to their high efficiency, small size and light weight. In operation, the switches included in the drive circuit of the power converter are used to change the duty cycle of the switches in the power converter (usually the ratio of the on-time of the switch to the total switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B37/02H05B45/10H05B45/3575H05B45/3725
Inventor 小J·R·D·卡门C·P·安杰利斯
Owner POWER INTEGRATIONS INC