| 摘要 |
An improved architecture of a power supply circuit with power factor correction, the power supply circuit includes power supply circuit output terminals and a voltage negative feedback circuit, the power supply circuit output terminals include a high potential terminals and a low potential terminals, the voltage negative feedback circuit includes a first feedback circuit and a second feedback circuit connected in series in order from the high potential terminal to the low potential terminal, a connection point of the first feedback circuit and the second feedback circuit acts as a feedback signal output terminal through which the voltage negative feedback circuit outputs a feedback signal, in the improved architecture, the first feedback circuit is replaced by a light source branch including a constant-current light source, and the second feedback circuit is replaced by a resistor branch for determining a working current of the light source branch. This improved architecture can perform a constant-current supply with high power factor and high efficiency for the light source.
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