Driving circuit for driving light source, method and controller

A driving circuit and controller technology, applied in the direction of light source, electric light source, electric lamp circuit layout, etc., can solve the problem of accurate control of average current, and achieve the effect of correcting power factor, reducing size and cost, and improving power supply quality

Inactive Publication Date: 2014-04-09
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the average current flowing through the inductor 112 and the LED chain 108 will be affected by the inductance value of the inductor 112, the input voltage V IN and the influence of the

Method used

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  • Driving circuit for driving light source, method and controller
  • Driving circuit for driving light source, method and controller
  • Driving circuit for driving light source, method and controller

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Embodiment Construction

[0040] A detailed description will be given below of embodiments of the present invention. Although the present invention has been illustrated and illustrated by these embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, the invention covers all alternatives, modifications and equivalents which are within the spirit and scope of the invention as defined by the appended claims.

[0041] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, processes, components and circuits are not described in detail so as to highlight the gist of the present invention.

[0042] figure 2Shown is a block diagram of a light source driving circuit 200 according to one embodiment of the pre...

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PUM

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Abstract

The invention provides a driving circuit for driving a load, a method and a controller. The driving circuit comprises a convertor, a transformer, a first inductor and a second inductor. The converter receives input voltage and provides regulated voltage; the transformer converts the regulated voltage into output voltage so as to provide power for the load; when a switch works at a first state, first current flowing through the convertor and second current flowing through the transformer flow through the switch; the first inductor which is coupled between the switch and a first reference node provides a first induction signal for indicating the combined current of the first current and the second current; and the second inductor which is coupled between the first reference node and a second reference node provides a second induction signal which only indicates the second current. With the driving circuit, the method and the controller of the invention adopted, an inductor at the secondary side of the driving circuit and an isolator between the primary side and the secondary side of the driving circuit can be omitted, and therefore, the size and cost of the circuit can be reduced; and the power factor of the driving circuit is corrected, and therefore, power supply quality can be improved.

Description

technical field [0001] The invention relates to a driving circuit, in particular to a driving circuit, a method and a controller for driving a light source. Background technique [0002] figure 1 Shown is a block diagram of a conventional light source driving circuit 100 . The driving circuit 100 is used to drive light sources such as LED strings 108 . The power supply 102 provides the input voltage V IN Provide power to the drive circuit 100 . The driving circuit 100 includes a buck converter that provides a converted voltage VOUT to the LED string 108 under the control of the controller 104 . The buck converter includes a diode 114 , an inductor 112 , a capacitor 116 and a switch 106 . Resistor 110 is connected in series with switch 106 . When the switch 106 is on, the resistor 110 is coupled with the inductor 112 and the LED string 108 to generate a feedback signal indicative of the current flowing through the inductor 112 . When the switch 106 is turned off, the r...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 阎铁生刘雪山郭清泉
Owner AOTU ELECTRONICS WUHAN
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