Linear LED driving circuit and electronic device
By introducing a switch module and two constant current control modules into the linear LED driving circuit, the input current waveform is optimized, and the problem of the 3rd and 5th harmonics exceeding the standard in the prior art LED input current is solved, achieving the satisfaction of the IEC61000-3-2 standard and reducing the system cost.
WO2025060508A1 Publication Date: 2025-03-27CRM ICBG (WUXI) CO LTD
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Patent Information
- Application Number
- PCT/CN2024/097568
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-09-18
- Filing Date
- 2024-06-05
- Publication Date
- 2025-03-27
AI Technical Summary
Technical Problem
In the prior art, the third and fifth harmonics of LED input currents are prone to exceed the standard and are difficult to meet the requirements of the IEC61000-3-2 standard.
Method used
By introducing a switching module and two constant current control modules into the linear LED driving circuit, the waveform of the input current is optimized to meet the standard requirements of high-order harmonics.
Benefits of technology
The input current waveform is optimized, the third and fifth harmonic requirements in the IEC61000-3-2 standard are met, and the demand for external components is reduced, and the overall system cost is reduced.
✦ Generated by Eureka AI based on patent content.
Abstract
Provided in the present invention are a linear LED driving circuit and an electronic device. The circuit comprises two constant-current control modules, wherein when a busbar voltage is lower than a forward turn-on voltage of an LED, power is supplied by means of an input capacitor, and a constant current is controlled by means of a first / third constant-current control module; when the busbar voltage is higher than the forward turn-on voltage of the LED but lower than the voltage on the input capacitor, power is supplied by means of the busbar voltage, and a constant current is controlled by means of a second / fourth constant-current control module; and when the busbar voltage is higher than the voltage on the input capacitor, power is supplied by means of the busbar voltage, the input capacitor is charged, and a constant current is controlled by means of the second / fourth constant-current control module. In the linear LED driving circuit and electronic device of the present invention, by means of a switch module and the two constant-current control modules, high-order harmonics are optimized by means of the simplest method to meet requirements of the standards; and requirements for an external element can also be reduced by means of a parasitic diode of a power transistor itself, thereby further reducing the overall cost of a system.
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