A non-isolated step-down led drive circuit with intelligent synchronous rectification
A technology of LED drive and synchronous rectification, which is applied in the direction of lamp circuit layout, electric light source, energy-saving control technology, etc., can solve the problems of low power supply efficiency and large rectification loss, and achieve the effect of improving conversion efficiency, reducing rectification loss, and easy realization
Active Publication Date: 2017-08-15
SHENZHEN WINSEMI MICROELECTRONICS
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Problems solved by technology
The forward voltage drop of the fast recovery diode can reach 1.0V~1.2V, even if the Schottky diode with low conduction voltage drop will produce a voltage drop of about 0.6V, which will lead to large rectification loss and lower power supply efficiency
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[0028] The invention provides an intelligent synchronous rectification non-isolated step-down LED drive circuit, which rectifies the current output by the PWM control module through the synchronous rectification module, and uses the rectification switch tube to replace the traditional Schottky diode, which solves the problem of the diode positive The problem of large power loss caused by voltage drop, so as to achieve the purpose of reducing rectification loss and improving efficiency. .
[0029] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0030] see figure 1 , the intelligent synchronous rectification non-isolated step-down LED driving ci...
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The invention discloses a non-isolated step-down LED driving circuit of intelligent synchronous rectification. The driving circuit comprises an AC (Alternating Current) input end, a rectifying filter module, a PWM (Pulse-Width Modulation) control module and a synchronous rectification module, wherein the LED driving circuit is used for rectifying current output by the PWM control module, detecting voltage between a drain and a source of a rectifying switch tube, opening the rectifying switch tube when the voltage reaches starting threshold voltage, and cutting off the rectifying switch tube when the voltage reaches turn-off voltage, therefore the conversion efficiency can be improved, low EMI (Electro-Magnetic Interference) can be realized, and the output current is automatically applicable to the change of an inductance value and the change of output voltage, so as to truly realize constant-current driving LED. The rectifying filter module is arranged in the synchronous rectification tube to replace a traditional Schottky diode to rectify, the problems that the power loss is large caused by the forward voltage drop of a diode can be solved, the rectifying loss can be reduced, and the efficiency can be improved.
Description
technical field [0001] The invention relates to the technical field of switching power supply and synchronous rectification, in particular to an intelligent synchronous rectification non-isolated step-down LED driving circuit. Background technique [0002] In recent years, the development of electronic technology has made the working voltage of the circuit lower and lower, and the current is higher and higher. Low-voltage operation is conducive to reducing the overall power consumption of the circuit, but it also poses new challenges to power supply design. [0003] The loss of the switching power supply is mainly composed of three parts: the loss of the power switch tube, the loss of the high-frequency transformer, and the loss of the output rectifier tube. In the case of low voltage and high current output, the conduction voltage drop of the rectifier diode is relatively high, and the loss of the rectifier tube at the output end is particularly prominent. The forward vol...
Claims
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IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 宋利军郭晋亮
Owner SHENZHEN WINSEMI MICROELECTRONICS