Negative resistance compensating circuit
A negative resistance compensation and circuit technology, which is applied to the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve the problems of small illuminance change range and flickering, and achieve the effect of large illuminance change range
Inactive Publication Date: 2015-01-21
广州欧科廷智能科技股份有限公司
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Problems solved by technology
[0004] The present invention is to solve the problems that the illuminance change range is small and the flickering is serious at low illuminance when the thyristor dimmer is used for dimming energy-saving lamps and LED lamps.
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[0019] Below in conjunction with embodiment explain accompanying drawing and illustrate the invention of the present invention.
[0020] figure 2 Inside the dashed box 4 is a specific circuit of a negative resistance module. VC1 is a rectifier bridge, one AC input end (6) of which is connected to one end of 220V mains, and the other end of the mains is connected to the other input end (7) of VC1 after the thyristor dimmer (1) is connected in series. Under the action of the thyristor dimmer (1), the effective value of the AC voltage input by the rectifier bridge VC1 is adjustable, and the average value of the DC voltage output by the rectified VC1 is adjustable. However, the input voltage waveform is no longer a complete sine wave, but a "cut-off sine wave" with a missing piece, such as image 3 As indicated, VC1 rectifies the voltage of such a waveform, Figure 4 Represents the rectified waveform, where u is the instantaneous value of the alternating current, Um, -Um are t...
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A negative resistance compensating circuit can be produced into small modules to be in parallel connection with an input terminal and then to be in series connection with a thyristor dimmer to connect to alternating current electric supply; equivalently a dummy load is added to a 220 V alternating current electric supply loop; a small current still flows through the dummy load to provide a compensation function to maintain that the 220 V alternating current electric supply loop is unobstructed when an alternating current output effective value is below a working voltage threshold of lamps and lanterns; and a negative resistance module which can serves as a two-terminal device with nonpolarity is low in cost. The negative resistance compensating circuit has the advantages of meeting the illuminance adjustment requirement of users for light source such as energy saving lamps and LED (Light Emitting Diode) lamps and lanterns; solving the problems that the thyristor dimmer which is commonly utilized in former incandescent lamp dimming is mature in technology and low in price but enables a change range of illuminance to be narrowed and a flickering problem is serious in a low illumination level when being used for dimming of the energy saving lamps and the LED lamps and lanterns; and achieving an incandescent lamp dimming effect.
Description
technical field [0001] The invention relates to a negative resistance circuit and belongs to the technical field of lamp power supplies. It is used for negative resistance compensation when dimming energy-saving lamps and LED lamps, which solves the problems of narrow dimming range of energy-saving lamps and LED lamps, and flickering when dimming lamps with low illumination. Background technique [0002] Energy-saving lamps are now widely used, and LED lamps are a new type of green lighting electric light source, and there is also a requirement for adjusting the illuminance of these light sources. In the past, "thyristor dimmers" were almost all used for dimming incandescent lamps. This kind of thyristor dimmer can be regarded as a two-terminal device, which is connected in series with the incandescent lamp to 220V AC mains. It uses phase control technology to change the conduction angle of the power frequency AC, which also changes the output voltage of the power frequency...
Claims
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IPC IPC(8): H05B37/00
CPCY02B20/40
Inventor 何曙光
Owner 广州欧科廷智能科技股份有限公司