Driving power supply without electrolytic capacitor
A technology for driving power supply and electrolytic capacitors, applied in electric light source, electric lamp circuit layout, light source and other directions, can solve the problems of sacrificing ripple performance and PFC performance, reducing reliability, short life and other problems, so as to improve PFC performance, prolong life, The effect of reducing the volume
Inactive Publication Date: 2014-06-11
南京冠亚电源设备有限公司
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Problems solved by technology
[0004] 1. The service life is relatively short, about 5000 hours, and the volume is large
[0005] 2. Electrolytic capacitors will leak electrolyte
[0006] 3. The performance of electrolytic capacitors gradually deteriorates with the increase of ambient temperature
[0007] 4. The temperature resistance and impact resistance performance of electrolytic capacitors are poor, which reduces the reliability
However, this method of replacing electrolytic capacitors with ceramic capacitors comes at the expense of ripple performance and PFC performance
At the same time, as far as the selection of the size of the ceramic capacitor is concerned, if the ripple is large, the corresponding capacitor will be reduced, but too large ripple will cause problems such as system instability and stroboscopic, so the size of the ceramic capacitor should be selected reasonably
Method used
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Embodiment Construction
[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.
[0033] Such as figure 1 As shown, the LED drive power supply without electrolytic capacitor of the present invention includes a mains rectifier circuit, a PFC circuit, a ceramic capacitor C b , Bidirectional converter, DC / DC circuit, digital control circuit, protection circuit.
[0034] The mains non-rectification circuit is composed of four rectifier diodes D5, D6, D7 and D8. The PFC circuit includes a first switch tube Q1, a first diode D1, and a first inductor L1. The positive terminal of the first inductor L1 is connected to the positive terminal of the power supply of the PFC circuit, the positive terminal of the first diode D1 is connected to the drain of the first switching tube Q1, and the drain of the first diode D1 and the first switching tube Q1 are respectively connected to the first The negative terminal of inductor L1. ...
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The invention discloses an LED driving power supply without an electrolytic capacitor, belonging to the field of LED driving power supply. The LED driving power supply comprises a commercial power rectification circuit, a PFC circuit, a DC / DC circuit, a bidirectional converter, a ceramic capacitor, and a digital control circuit, wherein after a commercial power signal is subjected to rectification by the commercial power rectification circuit, the signal is inputted into the PFC circuit. The PFC circuit accesses the ceramic capacitor. The DC / DC circuit and the bidirectional converter are in parallel connection with the ceramic capacitor respectively. The DC / DC circuit accesses the LED load. The LED load outputs a current sampling signal to the digital control circuit. The digital control circuit controls the PFC circuit, the DC / DC circuit and the bidirectional converter respectively. According to the driving power supply, the ceramic capacitor is used to replace the electrolytic capacitor, and the power supply has the advantages of a long service life, small volume, good ripple performance and good PFC performance.
Description
technical field [0001] The invention belongs to a driving power supply, in particular to an LED driving power supply. Background technique [0002] With the development of LED, the requirements for LED driving power are getting higher and higher. High performance, high reliability and long life are the key characteristics of LED driving power design. [0003] The service life of LED can reach 30,000 to 100,000 hours. Traditional LED drive power contains electrolytic capacitors, and electrolytic capacitors have the following disadvantages: [0004] 1. The service life is relatively short, about 5000 hours, and the volume is relatively large. [0005] 2. Electrolytic capacitors will leak electrolyte. [0006] 3. The performance of electrolytic capacitors gradually deteriorates with the increase of ambient temperature. [0007] 4. The temperature resistance and impact resistance of electrolytic capacitors are poor, which reduces reliability. [0008] The inherent characteri...
Claims
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IPC IPC(8): H05B37/02
Inventor 张海波孙邦伍李鸽王兆明尹文娇
Owner 南京冠亚电源设备有限公司