Patent ID: 9543843
Date: 2017-01-10
CPC Classifications: H02M,Y02B

Claim:
1. A power supply device having a primary side and a secondary side isolated from each other, the power supply device comprising: a power supply unit converting power from the primary side to output the converted power to the secondary side; a control unit located on the secondary side and acquiring control information on the power supply unit based on a voltage output from the power supply unit; and a delivery unit that delivers the control information to the primary side, the delivery unit including a Y-capacitor element that provides an EMI noise path between the primary side and the secondary side, wherein the delivery unit includes: a first deliverer delivering first transition information from the control unit to instruct transition from a low level to a high level; and a second deliverer delivering second transition information from the control unit to instruct transition from the high level to the low level, wherein the first deliverer includes a first capacitor element, a first resistor element, and a first diode element, wherein the first resistor element is electrically connected between one terminal of the first capacitor element and one terminal of the Y-capacitor element, the one terminal of the first capacitor element is electrically connected to an anode of the first diode element, and the other terminal of the Y-capacitor element is grounded, and wherein the second deliverer includes a second capacitor element, a second resistor element, and a second diode element, wherein the second resistor element is electrically connected between one terminal of the second capacitor element and the one terminal of the Y-capacitor element, the one terminal of the second capacitor element is electrically connected to an anode of the second diode element, and the other terminal of the Y-capacitor element is grounded.