Current feedback circuit and LED (light-emitting diode) lamp drive circuit
A current feedback and current control circuit technology, applied in the direction of electric lamp circuit layout, electric light source, lighting device, etc., can solve the problems of LED lamp not working normally, constant voltage source and linear constant current source oscillation, oscillation, etc., to avoid oscillation , The effect of improving driving efficiency and reducing loss
Active Publication Date: 2013-11-13
SHENZHEN HUNTKEY ELECTRIC
View PDF7 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] However, the above-mentioned feedback circuit can easily lead to oscillation between the constant voltage source and the linear constant current source, especially when the LLC resonant converter is used as the constant voltage source, the feedback current generated by the feedback circuit will frequently change the operating frequency of the constant voltage source And cause oscillation, so that the LED lamp can not work normally
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0034] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0035] The present invention mainly provides a current feedback circuit to solve the oscillation of the constant voltage source and the linear constant current source caused by the feedback circuit, and generates a stable feedback current to the constant voltage source voltage feedback resistor after sampling the power consumption voltage of the linear constant current source. For the constant voltage source to lower the output voltage according to the feedback current, reduce the loss of the linear constant current source, so as not to cause the oscillation of the constant voltage source and the linear constant current source, and further improve the drive of the LED lamp while ensuring the stable operation of the LED efficiency.
[0036] figure 1 It is a structural block diagram of an embodiment of the current feed...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a current feedback circuit which comprises a sampling circuit and a current control circuit, wherein the sampling circuit is connected with a linear constant current source and used for sampling the power-consumption voltage of the linear constant current source; and the current control circuit is connected with the sampling circuit and used for generating a stable feedback current according to the sampled power-consumption voltage and outputting the stable feedback current to a constant voltage source. The invention also relates to an LED (light-emitting diode) lamp drive circuit, which is characterized in that the power-consumption voltage of the linear constant current source is sampled by the sampling circuit, then a stable feedback current is generated according to the sampled power-consumption voltage and output to a voltage feedback resistor of the constant voltage source, so that the constant voltage source lowers output voltage according to the feedback current, and the loss of the linear constant current source can be reduced. In the invention, a stable feedback current is generated according to the power-consumption voltage of the linear constant current source, thereby avoiding the oscillation (caused by the feedback current) on the linear constant current source and the constant voltage source, and further improving the drive efficiency of an LED lamp when an LED works stably.
Description
technical field [0001] The invention relates to the technical field of drive circuits, in particular to a current feedback circuit for an LED lamp drive circuit and the LED lamp drive circuit. Background technique [0002] With the intensification of the world's energy crisis, it has become a consensus to reduce energy consumption and protect the environment. LED lighting will replace energy inefficient first and second generation lighting technologies. When in use, the high-power LED lighting lamps are all connected in series with multiple LED lights, and each string of lights is driven separately. [0003] Since the characteristics of LED lamps require constant voltage and constant current driving, the existing LED lamp drive circuits control the operating current of LED lamps by using a fixed input voltage and using current-type PWM or linear steady-state control technology. However, this driving method cannot synchronously adjust the input voltage and operating current...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 段卫垠汪本强
Owner SHENZHEN HUNTKEY ELECTRIC