A ballast compatible led drive circuit
A LED drive and ballast technology, applied in the use of electrical components, semiconductor lamps, etc., can solve problems such as difficult mass production, ballast compatible circuits cannot meet leakage standards, poor compatibility, etc., to achieve the effect of preventing interference
Active Publication Date: 2022-07-26
惠州市德萤科技有限公司
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Problems solved by technology
[0005] The invention provides a ballast-compatible LED driving circuit, which solves the problem that the existing ballast-compatible circuit cannot meet the leakage standard of American UL lamp tube double-terminal power supply, and the reliability of the mains input circuit and the ballast input circuit is low. Poor compatibility and high cost of circuit components make it difficult to mass-produce technical problems
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[0042]The embodiments of the present invention will be explained in detail below in conjunction with the accompanying drawings. The examples are given only for the purpose of illustration and should not be construed as a limitation of the present invention. The accompanying drawings are only used for reference and description, and do not constitute a limitation on the protection scope of the patent of the present invention. limitation, since many changes may be made in the present invention without departing from the spirit and scope of the invention.
[0043] like Figure 1 to Figure 3 As shown, an embodiment of the present invention provides a ballast-compatible LED drive circuit: including a rectifier circuit 1, a leakage protection circuit 2 and a ballast protection circuit 3 connected thereto; The connected power conversion circuit 4; the power conversion circuit 4 is also connected to the leakage protection circuit 2;
[0044] After the commercial power flows in from th...
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The invention relates to the technical field of LED drive protection, and provides a ballast-compatible LED drive circuit, comprising a rectifier circuit, a leakage protection circuit and a ballast protection circuit connected thereto; and a power conversion circuit connected with the ballast protection circuit. It also includes an anti-interference circuit and a filter circuit connected in series between the rectifier circuit and the anti-interference circuit; the leakage protection circuit is also connected to a power conversion circuit; Under the action of the ballast protection circuit, it flows through the leakage protection circuit and the power conversion circuit successively and then is output to the LED load; output directly to the LED load. The invention provides a ballast-compatible LED driving circuit, which not only meets the leakage protection requirements of UL in the United States, but also realizes the low-cost compatible input of the ballast and the commercial power.
Description
technical field [0001] The invention relates to the technical field of LED drive protection, in particular to a ballast-compatible LED drive circuit. Background technique [0002] In American lighting applications, there are still many fluorescent lamps driven by ballasts. Compared with LED lamps, fluorescent lamps have high energy consumption and low brightness. However, in old renovation projects, simple retrofit ballast-compatible LED lamps are still very popular. market. [0003] In order to prevent electricians from getting electric shock when installing the lamp, UL (Underwriters Laboratories) stipulates that when the lamp is connected to AC at both ends, when the PIN pin at one end is energized, the PIN pin at the other end passes through the equivalent resistance model of the human body. The current to the ground cannot exceed 5MUI (microampere), and to meet the UL standard, a leakage protection circuit needs to be added to the lamp circuit. [0004] In the transfo...
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IPC IPC(8): H05B45/345
CPCH05B45/345Y02B20/30
Inventor 罗桂冬朱坤容张笑英刘攀王伟邱美招郭春梅
Owner 惠州市德萤科技有限公司