Power supply converter, related control circuit and related control method
A technology of power converter and conversion circuit, which is applied in the direction of electric lamp circuit arrangement, electric light source, electroluminescence light source, etc., can solve the problems of inability to light up, low-power light-emitting device lights flicker, etc., achieves good compatibility and avoids flickering or effects that cannot be lit
Inactive Publication Date: 2014-06-18
RICHTEK TECH
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Problems solved by technology
However, even when the technology of the above-mentioned publication is used to operate with an electronic transformer, there will still be compatibility problems, resulting in problems such as light flickering or failure to light up low-power light-emitting devices.
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[0016] Embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals indicate the same or similar elements or process steps.
[0017] figure 1 It is a simplified functional block diagram of an embodiment of the lighting system 100 of the present invention. The lighting system 100 includes an electronic transformer 120 , a rectifier circuit 140 , a power converter 160 and a low-power lighting device 190 . For brevity, figure 1 Other components and connections of the lighting system 100 are omitted for ease of description. For example, the lighting system 100 may also include components such as a dimmer, so that the user can adjust the desired brightness.
[0018] In this embodiment, the electronic transformer 120 includes an oscillation circuit (not shown in figure 1 ), and the converted voltage signal Vc can be generated according to the input voltage signal Vin. For example, an AC signal w...
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The invention discloses a power supply converter, a related control circuit and a related control method. The power supply converter comprises a boost type conversion circuit, a buck type conversion circuit and the control circuit, wherein the control circuit is used for setting the boost type conversion circuit to alternately work in a current switching-on mode and a current stop mode, the boost type conversion circuit is enabled to draw current from the electronic type transformer in multiple modes when the boost type conversion circuit is in the current switching-on mode, and the boost type conversion circuit is paused from drawing the current from the electronic type transformer when the boost type conversion circuit is in the current stop mode; the control circuit is also used for setting the buck type conversion circuit to supply needed output signals to a low-power light emitting device according to output signals of the boost type conversion circuit, and thus a needed illumination function can be supplied by the low-power light emitting device. In the embodiment, the current can be drawn from the electronic type transformer by the power supply converter in time in multiple working modes, thus the electronic type transformer and the low-power light emitting device can be normally matched for work, and the effect of compatibility can be realized.
Description
technical field [0001] The present invention relates to a power converter for a lighting system, especially a power converter with better compatibility, a related control circuit and a method. Background technique [0002] In view of the increasing scarcity of energy and the improvement of environmental awareness, many traditional products with poor energy efficiency are constantly being replaced by new energy-saving products. For example, in lighting systems, low-power light-emitting devices such as light-emitting diodes are often used to replace traditional light-emitting devices such as incandescent lamps and halogen lamps to save energy. [0003] Many low-power light emitting devices are manufactured in the form of standard light bulbs or light tubes to directly replace traditional light bulbs or light tubes. For example, light-emitting diodes are used to make T8-standard lamp tubes, E27-connected light bulbs, and MR16-standard light bulbs. However, many circuit compon...
Claims
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IPC IPC(8): H02M7/217H02M3/155H05B44/00
CPCH05B37/02H05B45/38H05B45/375
Inventor 郑刚邱仁炼陈培元
Owner RICHTEK TECH