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Adaptive circuit

A technology of self-adaptive circuits and circuits, applied in the direction of circuit layout, lamp circuit layout, electric light source, etc., can solve the problems of being vulnerable to extreme voltage stress, switch failure, etc.

Active Publication Date: 2011-11-16
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the described circuit at least one of the switches is subject to extreme voltage stress during mains voltage transients such that unless additional overvoltage protection is provided to the switch, the switch may eventually fail

Method used

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Embodiment Construction

[0040] figure 1 A prior art adaptive circuit 10 of the type described in JP5709736 is shown for reducing the input voltage applied across the input terminals 170 , 171 in order to obtain a lower voltage for a load connected across the output terminals 180 , 181 . This type of circuit is suitable for small device applications, such as handheld devices, where a transformer would not be suitable due to its size and weight. The input voltage can be a DC voltage or a rectified AC voltage. The first switch 11, the first capacitor 13, the diode 16 and the second capacitor 14 are connected in series. The second diode 15 is connected in parallel with the first diode 16 and the second capacitor. The second switch 12 is connected across the first capacitor 13 and the first diode 16 . To reduce the input voltage, the first and second switches 11, 12 are switched alternately. When the first switch 11 is closed (and the second switch 12 is open), the series connected capacitors 13 , 14 ...

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PUM

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Abstract

The invention discloses an adaptive circuit which is used for driving a lower-voltage DC (direct current) load (2) from a rectifying higher-voltage AC (alternating current) power supply (3), comprising charge storage circuits (21, 21') and active switch (22, 22') which are realized as controlled current sources (22, 22'), wherein the charge storage circuits (21,21') respectively comprise a first capacitor (C1) and a second capacitor (C2) in series connection basically; the second capacitor (C2) is in parallel connection with the load (2) at least; and the active switches (22, 22') are used for controlling load current (Iload) by the load (2), so that the load current (Iload) is sucked basically by the first capacitors (C1) in the charge storage circuits (21,21') in a closed switch state and the load current (Iload) is sucked by the second capacitors (C2) basically in a broken switch state. The invention also discloses an LED (light-emitting diode) improved lamp (4), comprising a connecting device (40) which is used for connecting the LED improved lamp (4) with a higher-voltage utility power signal (UPS), an LED device (2) which is specified to be used for a lower-voltage power supply and the adaptive circuit (1, 1') which is used for adjusting a higher-voltage utility power signal (UPS) to a low-voltage signal (UC2) so as to drive the lower-voltage LED device (2). The invention also discloses a method for driving the lower-voltage DC load (2) from the rectifying higher-voltage AC power supply (3).

Description

technical field [0001] The present invention describes an adaptive circuit for driving a lower voltage DC load from a higher voltage AC source. The invention also describes an LED retrofit lamp and a method of driving a lower voltage DC load from a higher voltage AC source. Background technique [0002] Advances in LED (Light Emitting Diode) technology have led to the development of LEDs with desirably high light output, making them an interesting alternative to incandescent or fluorescent lamps. LED lighting devices can easily be designed with efficacy exceeding 100 lm / W. In addition, LEDs are more efficient, more reliable and have a longer lifespan than conventional lights. Therefore, replacing conventional lights with LEDs helps reduce energy consumption and emissions from power plants. Packages or chips containing LED junctions connected in series (to form LED strings with high forward voltages) are suitable for low-cost general lighting applications and are used in L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02F21S2/00F21V23/06H02M7/04F21Y101/02H05B44/00
CPCH05B33/0884H02M1/08H02M3/156H05B45/37H05B47/10H02M7/05Y02B20/30H02M3/07Y02B20/40H05B45/44H05B45/54
Inventor H·J·G·拉德马彻
Owner SIGNIFY HLDG BV
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