Offset Voltage Elimination Circuit Structure for Dimming Device Protection Mechanism

A protection mechanism, offset voltage technology, applied in the direction of lamp circuit layout, lighting device, light source, etc., can solve the problems affecting GD pulse output, voltage offset, etc.
CN105636307BActive Publication Date: 2019-06-21昱京能源科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
昱京能源科技股份有限公司
Publication Date
2019-06-21

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Abstract

An offset voltage cancellation circuit structure of a dimming apparatus protection mechanism is disclosed. The offset voltage cancellation circuit mainly comprises a constant current source capable of outputting constant current; the output end of the constant current source is connected with a dimming signal input end through a current-limiting resistor; the dimming signal input end is connected with an external conventional dimmer output end; when current passes through the current-limiting resistor, a current-limiting resistance voltage that causes voltage offset is generated; an input end of a subtracter is communicated with the constant current source; an offset reference voltage can be imported into another input end of the subtracter; a non-inverted input end of a hysteresis comparator is connected to the output end of the subtracter; and a sawtooth wave can be input to the inverted input end of the hysteresis comparator. Therefore, the offset reference voltage is set to be equal to the current-limiting resistance voltage; the current-limiting resistance voltage can be cancelled by the subtracter, so that the hysteresis comparator can obtain a correct dimming signal voltage, and a GD pulse signal capable of adjusting the luminance of light rays is output.
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Description

[0001] Technical field:

[0002] The present invention relates to an offset voltage elimination circuit structure for the protection mechanism of a dimming device, in particular to a structure that can provide current output when connecting an external resistor type dimmer, and effectively eliminate the external current limiting resistor used for the protection circuit. Circuit configuration for voltage difference (offset).

[0003] Background technique:

[0004] Light-emitting diodes (LEDs) have the characteristics of low energy consumption and long service life, so they have gradually been matured and widely used in various lighting requirements; however, due to the great differences between LED light source components and traditional light source Physical characteristics are different, and the dimming circuit suitable for traditional light source components cannot directly control the brightness change of LED light source components, so a conversion circuit is used to connec...

Claims

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