US 12,309,898 B2
Interface control circuit, control method and interface control device
Jian Wu, Shanghai (CN); Shunfa Zhang, Shanghai (CN); Zhonghua Sun, Shanghai (CN); and Peng Wang, Shanghai (CN)
Assigned to SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed by SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed on Jul. 31, 2023, as Appl. No. 18/362,267.
Claims priority of application No. 202310487614.6 (CN), filed on Apr. 28, 2023.
Prior Publication US 2024/0365457 A1, Oct. 31, 2024
Int. Cl. H05B 47/24 (2020.01); H05B 47/165 (2020.01)
CPC H05B 47/165 (2020.01) [H05B 47/24 (2020.01)] 15 Claims
OG exemplary drawing
 
1. An interface control circuit suitable for use in a dimming system compatible with both digital addressable lighting interface (DALI) dimming and push-button dimming, the interface control circuit comprising a DALI signal reception control module having a first switch element,
the DALI signal reception control module configured to be enabled, when a voltage at a power supply terminal of the interface control circuit reaching a pre-start voltage, to turn on or off the first switch element according to a magnitude of a voltage on a DALI bus, wherein the pre-start voltage is lower than a start voltage of the interface control circuit,
wherein the DALI signal reception control module further comprises a constant-current source, a pre-start module and an overvoltage and undervoltage protection module,
wherein one end of the first switch element is series-connected to the constant-current source and then grounded, and the other end of the first switch element is connected to a signal reception terminal of the interface control circuit, and
wherein an input terminal of the pre-start module is connected to the power supply terminal of the interface control circuit, an input terminal of the overvoltage and undervoltage protection module is connected to a voltage detection terminal of the interface control circuit, an output terminal of the pre-start module and an output terminal of the overvoltage and undervoltage protection module connected to each other and then to a control terminal of the first switch element.