Tandem-switch-controlled variable load LED (light-emitting diode) driving circuit
A technology of LED driving and series switching, which is applied in the layout of electric lamp circuits, electric light sources, lighting devices, etc., can solve the problems of unsatisfactory power factor, influence on service life, and high power factor, and achieves low cost, long service life and small size. Effect
Active Publication Date: 2013-01-02
NORTH-CHINA INTEGRATED CIRCUIT CO LTD
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Problems solved by technology
The advantage of this kind of circuit lies in its high efficiency, high safety standards due to the existence of isolation devices, and more accurate control of the output current; but because there are many peripheral devices and contain control ICs, the circuit cost is high, the volume is large, and the power The factor is also not ideal due to the large input capacitance; to achieve DC drive, it must also contain a large electrolytic capacitor, which will affect the service life
To sum up, the current traditional LED drive circuit cannot take into account the comprehensive advantages of low cost, high efficiency, high power factor, small size, etc., and there is a lot of room for improvement
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[0023] like figure 1 As shown, a variable load LED drive circuit controlled by a series switch, the light-emitting diodes LED1-LEDn are connected in series in sequence, the positive pole of LED1 is connected to the positive pole of the output terminal of rectifier bridge IC1, and the first path of the negative pole of LEDn is connected to the input terminal of the feedback module FB. The second path of the negative pole of LEDn is connected to the negative pole of the output terminal of rectifier bridge IC1, and the high-voltage switching devices S1-Sn-1 in the series switch control module C are connected in series in sequence, the high-voltage switching device Sn-1 is connected in parallel with LEDn-1, and the output of the feedback module FB terminal is connected to the control terminal of the high-voltage switch device S1-Sn-1, the feedback module FB can control the high-voltage switch device S1-Sn-1 to be turned on and off, and n is a natural number greater than 1. The fe...
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The invention discloses a tandem-switch-controlled variable load LED (light-emitting diode) driving circuit and relates to the technical field of electronic circuits. LED1-LEDn are sequentially connected in series, a positive pole of the LED1 is connected with the positive pole of an output terminal of a rectifier bridge IC1, a first path of the negative pole of the LEDn is connected with an input terminal of a feedback module FB, a second path of the negative pole of the LEDn is connected with the negative pole of the output terminal of the rectifier bridge IC1, high voltage switch devices S1-Sn-1 in a tandem switch control module C are sequentially connected in series, high voltage switch devices Sn-1 and LEDn-1 are connected in parallel, and the output terminal of the feedback module FB is connected with a control terminal of the high voltage switch devices S1-Sn-1. The LED driving circuit disclosed by the invention only adopts less peripheral circuits such as the rectifier bridge, is extremely small in volume and low in cost, can be directly integrated onto a lamp panel carried with an LED string, requires no electrolytic capacitor and is simple in circuit and long in service life.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a series switch controlled variable load LED drive circuit. Background technique [0002] Light-emitting diodes (LEDs) are widely used in lighting systems because of their high luminous efficiency, long life, high brightness, energy saving, environmental protection and durability. In order to give full play to its advantages and be fully compatible with the previous generation of lighting products such as incandescent lamps and energy-saving lamps, it is necessary to equip an LED drive circuit with small size, long life, low cost, and directly powered by AC mains to maximize Give full play to the advantages of LED itself. At present, there are many kinds of LED driving circuits powered by AC mains, which can be mainly divided into two categories. [0003] first class reference figure 2 , is a drive circuit with low cost as its main advantage, and this type of circu...
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IPC IPC(8): H05B37/02
Inventor 吴永辉吴洪江高学邦
Owner NORTH-CHINA INTEGRATED CIRCUIT CO LTD