2results about How to "Realize constant voltage output" patented technology

This application belongs to the field of wireless charging technology, specifically relating to a constant current and constant voltage wireless charging system and method based on a three-coil loosely coupled transformer, including an inverter circuit, a primary-side compensation circuit, a resonant circuit, a secondary-side compensation circuit, a rectifier circuit, and a filter capacitor; the resonant circuit has an anti-parallel coil structure, with the third coil located on the secondary side and a single coil on the primary side; its advantages are high misalignment tolerance, load-independent output, and high efficiency.

The present invention discloses an LED driver, including: a PFC main circuit, a drive control circuit, an isolation circuit, a voltage regulation circuit, a frequency control drive circuit, a current regulation circuit and a resonant DC-DC circuit, wherein the PFC main circuit is connected to the resonant DC-DC circuit, the resonant DC-DC circuit is respectively connected to the input end of the current regulation circuit and the input end of the voltage regulation circuit, the output end of the current regulation circuit is connected to the input end of the frequency control drive circuit, the output end of the frequency control drive circuit is connected to the resonant DC-DC circuit, the output end of the voltage regulation circuit is connected to the input end of the drive control circuit via the isolation circuit, and the output end of the drive control circuit is connected to the PFC main circuit. The present invention realizes the multi-channel output of the LED driver through different coupling coefficients between the two secondary windings of the transformer and the primary winding, and realizes that the multi-channel output of an LED has both constant voltage output and constant current output through the voltage regulation circuit and the current regulation circuit.