Unlock instant, AI-driven research and patent intelligence for your innovation.
A control method and control device of an LED drive circuit
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of LED drive and LED circuit, applied in the direction of energy-saving control technology, electrical components, etc., can solve the problems of easy damage of LED lamps and increased reverse voltage.
Active Publication Date: 2022-01-28
GREE ELECTRIC APPLIANCES INC
View PDF5 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] Therefore, the technical problem to be solved by the present invention lies in the problem existing in the prior art that when the LED drive circuit is scanned, the reverse voltage at both ends of the LED lamp increases, making the LED lamp easily damaged.
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 more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0030] In a common-polarity circuit, for example, in a common-anode and common-cathode circuit, the level conversion will occur when the cathode is scanned through the circuit scanning sequence, and the anode is scanned. The scanning principle is to change the potential at both ends of the LED lamp in a certain order, so that the lamp is in a forward voltage drop for a period of time, so that the LED lamp is lit. Due to the non-mutability of the parasitic capacitance of the LED lamp itself, the two LED lamps in the adjacent switching sequence, that is, "the previous LED light is on, the next LED light is off", and the switch is "the previous LED light is off, the next LED light is on". "During the switching process, due to the non-mutability of the capacitance, the reverse voltage at both ends of the previous LED lamp increases, and the reverse voltage at this time is relatively high. After exceeding the withstand voltage value of the LED lamp, it is easy to make the LED lamp ...
Embodiment 2
[0053] An embodiment of the present invention also provides a control device for an LED drive circuit, the control device comprising:
[0054] The processing module is used to control the two LED lamps that are in the common pole circuit with the next LED lamp to be lit when the next LED lamp to be lit is determined according to the scanning timing of the LED circuit. The terminal is set to a low level, and the low level is any voltage lower than the withstand voltage value of the LED; the last lit LED lamp and the next LED lamp to be lit are in a common pole circuit; For details, refer to the relevant description of step S1 in the above method embodiment, and details are not repeated here.
[0055] The timing module is used to respond to the timing operation; for details, please refer to the relevant description of step S2 in the above method embodiment, which will not be repeated here.
[0056] The first control module is configured to control the next LED lamp to be turned...
Embodiment 3
[0060] An embodiment of the present invention also provides a computer-readable storage medium, the computer-readable storage medium stores computer instructions, and the computer instructions are used to make the computer execute the control method described in any embodiment.
[0061] Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a flash memory (Flash Memory), a hard disk (Hard Disk Drive, abbreviation: HDD) or a solid-state drive (Solid-State Drive, SSD), etc.; the storage medium may also include a combination of the above-mentioned types of memory.
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 discloses a control method and a control device of an LED drive circuit. The control method includes: when the next LED lamp to be lit is determined according to the scanning sequence of the LED circuit, controlling the next LED lamp to be lit The LED lamp is in the common pole circuit, and the two ends of the last lit LED lamp are set to a low level, and the low level is any voltage lower than the withstand voltage value of the LED; the last lit LED lamp It is in a common pole circuit with the next LED lamp to be lit; it responds to the timing operation; when the preset time is reached, the next LED lamp to be lit is controlled to light up. With this setting, by delaying the preset time, the parasitic capacitance of the last lit LED lamp can have time to perform charging and discharging operations, so that the reverse voltage difference between the two ends of the LED after the parasitic capacitance is superimposed is lower than the withstand voltage value of the LED lamp, thus When switching the scanning sequence, it can ensure that the LED lamp will not be broken down, thereby prolonging the service life of the LED lamp.
Description
technical field [0001] The invention relates to the technical field of household appliances, in particular to a control method and a control device for an LED driving circuit. Background technique [0002] LED direct drive circuits are widely used in household and commercial equipment with LED display functions, and have the characteristics of large drive capacity and reduced controller cost. In a common anode or common cathode scanning circuit, level conversion occurs when sweeping the cathode or sweeping the anode. The scanning principle is to change the potential at both ends of the LED lamp in a certain order, so that the LED lamp is in a forward voltage drop for a period of time, so that the lamp is lit. [0003] Take a simple two scan as an example. like Figure 3 to Figure 6 As shown, when scanning the cathode in the common cathode circuit: when D16 is lit, COM1 is set to low level, COM2 is set to high level, SEG1 is set to high level, and SEG2 is set to low level. ...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More