Patent ID: 9148933
Filing Date: 2015-09-29
Classification: H05B

Abstract:
1. A power supply circuit for multiple LED loads, comprising: a first filter capacitor, a second filter capacitor, a first switch tube, a second switch tube, a first rectifier branch and a second rectifier branch, wherein: inputs of the first rectifier branch and inputs of the second rectifier branch are connected to a high-frequency AC power source; a first input of the first rectifier branch, a first diode, a first LED load, a fourth diode and a first capacitor are sequentially connected in series to a second input of the first rectifier branch; a second input of the second rectifier branch, the first capacitor, a third diode, a second LED load and a second diode are sequentially connected in series to a first input of the second rectifier branch; the first input of the first rectifier branch is connected to the first input of the second rectifier branch, and the second input of the first rectifier branch is connected to the second input of the second rectifier branch; the first filter capacitor is connected in parallel to the first LED load, and the second filter capacitor is connected in parallel to the second LED load; the first switch tube is connected in parallel to the second diode, and when the first LED load needs to be turned off, the first switch tube is switched on; and the second switch tube is connected in parallel to the fourth diode, and when the second LED load needs to be turned off, the second switch tube is switched on.