A bridge led constant current drive chip
A constant current drive chip and bridge technology, applied in the field of semiconductors, can solve problems such as complex structures, achieve the effects of increased voltage range, stable and reliable output current, and reduced production costs
Active Publication Date: 2017-12-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The LED lighting drive system consists of rectification and constant current two parts, the structure is relatively complex
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[0030] In this embodiment, the first high reverse withstand voltage constant current device D1, the second high reverse withstand voltage constant current device D2, the third highest reverse withstand voltage constant current device D3, and the fourth highest reverse withstand voltage constant current device The device D4 is the same high reverse withstand voltage constant current device, and the structure diagram of the high reverse withstand voltage constant current device is as Figure 5 As shown, it includes a P-type lightly doped substrate 2, an N-type lightly doped epitaxial layer 3 located on the P-type lightly doped substrate 2, and a diffused P-type well located in the N-type lightly doped epitaxial layer 3 Region 4, the diffused P-type well regions 4 are two and located at both ends, the P-type heavily doped region 5 and the N-type heavily doped region 7 in the diffused P-type well region 4 are located in the N-type heavily doped region The depletion channel region 6 ...
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A bridge-type LED constant current drive chip belongs to the technical field of semiconductors. Including 4 high reverse withstand voltage constant current devices, the anode of the first high reverse withstand voltage constant current device is connected to the cathode of the fourth high reverse withstand voltage constant current device to form the first node, the first high reverse withstand voltage constant current device The cathode of the device is connected to the cathode of the second high reverse withstand voltage constant current device to form a second node, and the anode of the second high reverse withstand voltage constant current device is connected to the cathode of the third high reverse withstand voltage constant current device to form a third node. The anodes of the three high reverse withstand voltage constant current devices are connected to the anodes of the fourth high reverse withstand voltage constant current device to form a fourth node; the first node and the third node are connected to the first AC input terminal and the second AC input terminal respectively, and the first node and the third node are respectively connected to the first AC input terminal and the second AC input terminal. The second node and the fourth node are respectively connected to the first DC output end and the second DC output end. The drive chip of the present invention combines the functions of rectification and constant current, simplifies the structure of the drive circuit, can realize the miniaturization of the drive system, and further reduces the cost.
Description
Technical field [0001] The invention belongs to the technical field of semiconductors, and specifically relates to a bridge LED constant current drive chip. Background technique [0002] Constant current source is a commonly used electronic equipment and device, which is mainly used to protect the entire circuit. Even if the voltage is unstable or the load resistance changes greatly, it can ensure the stability of the power supply current. The constant current source is already in the electronic circuit. Widely used, such as the driving of LED light strings. The traditional LED lighting driver is generally composed of a rectifier bridge plus one (or more) constant current chips or constant current devices. The constant current device is generally a constant current device similar to the JFET structure, which has the characteristics of bidirectional conduction, that is, the It can achieve the effect of constant current when working in the reverse direction. When working in the re...
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IPC IPC(8): H05B37/02
Inventor 乔明于亮亮何逸涛代刚张康张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA