Constant-current LED (light-emitting diode) driver circuit without electrolytic capacitor
A technology of LED drive and electrolytic capacitor, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., can solve the problems of life and reliability, achieve strong anti-interference ability, improve reliability and life, and save costs.
Inactive Publication Date: 2014-11-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF2 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, due to the use of electrolytic capacitors in traditional LED drivers, there are problems with their life and reliability. Therefore, when designing switching power supply drivers, the use of electrolytic capacitors should be reduced in a targeted manner.
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 1
[0012] Such as figure 2 As shown, this example includes a reference voltage generation module, LED module, power transistor PM, first operational amplifier, second operational amplifier, third operational amplifier, PMOS transistor PM1, hysteresis comparator, error amplifier, resistors R1~R9, capacitor C1~C2, inductor L, diode; among them, the drain of the power transistor PM is connected to the input power supply VIN, its source is connected to the positive input terminal of the LED module through the inductor L and R5 in turn, and its gate is connected to the output terminal of the hysteresis comparator; The non-inverting input terminal of the hysteresis comparator is connected to the output terminal of the error amplifier through the compensation network, and its inverting input terminal is connected to the output terminal of the first operational amplifier; the non-inverting input terminal of the error amplifier is connected to the first output terminal of the reference vo...
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 electronic circuit technique, in particular a constant-current LED (light-emitting diode) driver circuit without an electrolytic capacitor. The invention provides the structure diagram of an LED driving temperature compensation circuit. The constant-current LED driver circuit includes such modules as a reference voltage generation module, a logic module, a driver module, LEDs, a power tube, an operational amplifier, a PMOS (P-type metal-oxide-semiconductor) tube PM1, a delay amplifier and an error amplifier. The drain electrode of the PM1 is connected to the forward end of the LED1, and the leak current and the inductive current of the PM1 compensate mutually to form an output current with few ripples, thereby achieving LED constant-current driving. The constant-current LED (light-emitting diode) driver circuit has the following benefits: the high-capacity electrolytic capacitor is not used, so that the reliability of a power source is improved and the service life of the power source is prolonged; a slope compensation circuit is not required, so that the cost is reduced; the load transient response speed is high and the anti-jamming capability is high. The invention is particularly applied to LED driver circuits.
Description
technical field [0001] The invention belongs to the technology of electronic circuits, and in particular relates to a constant-current LED drive circuit without electrolytic capacitors. Background technique [0002] When analyzing the mean time between failures (MTBF) of switching power supplies, the failure rate of the driving power supply due to electrolytic capacitor failure is as high as 60%, which is a "short board" that restricts the reliability of switching power supplies, and its life does not match the long life of LEDs. , so the performance of the electrolytic capacitor directly determines the reliability of the circuit. However, due to the use of electrolytic capacitors in traditional LED drivers, there are problems with their life and reliability. Therefore, when designing switching power supply drivers, the use of electrolytic capacitors should be reduced in a targeted manner. Contents of the invention [0003] The purpose of the present invention is to propo...
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 Applications(China)
IPC IPC(8): H05B37/02
Inventor 李泽宏张建刚吴玉舟赖亚明任敏张金平高巍张波伍济郭旭阳杨力
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA