LED driving circuit and system
By designing a current reference generation circuit and a switching control circuit in the LED driving circuit, dynamically adjusting the current reference signal to control the charging current, solving the problem of LED lighting time caused by large-capacity electrolytic capacitors, and achieving a faster start-up speed.
CN119697828APending Publication Date: 2025-03-25JOULWATT TECH INC LTD
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Patent Information
- Application Number
- CN202411132972.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-03-25
AI Technical Summary
Technical Problem
In application scenarios with small output current, large-capacity electrolytic capacitors cause the LED load to light up for too long, affecting the user experience.
Method used
An LED driving circuit is designed, including a current reference generation circuit, a sampling circuit and a switching control circuit. By dynamically adjusting the current reference signal, the charging current of the output capacitor is controlled, thereby providing a large current when the output voltage is low and shortening the charging time.
Benefits of technology
It realizes the high current charging of the output electrolytic capacitor when the output voltage is low, shortens the start time and improves the system response speed.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention discloses an LED drive circuit which receives rectified input voltage, the input voltage charges an output capacitor after passing through a voltage conversion circuit, and the LED drive circuit comprises a current reference generation circuit used for providing a current reference signal; the sampling circuit is used for sampling a feedback signal representing the output voltage of the LED driving circuit, the sampling circuit is connected with the current reference generation circuit, and the current reference generation circuit can adaptively and dynamically adjust a current reference signal based on the feedback signal; and the switch control circuit is respectively connected with the current reference generation circuit and the voltage conversion circuit, and the switch control circuit can control the charging current of the output capacitor based on the current reference signal. According to the LED driving circuit provided by the invention, the current reference can be dynamically adjusted based on the output voltage, so that the capacitor is charged by a large current when the output voltage is relatively low, and the starting speed is accelerated.
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