| 摘要 |
A self-powered circuit for controlling the on and off switching of a power semiconductor switch (11), is disclosed wherein the circuit is adapted to be immune to common mode voltage (Vcm) changes. The circuitry is configured with a transmitter (41-47) section which acts as a current sink in response to Vin control signals. The transmitter section includes diodes (45, 46) and resistors (42-44) selected and configured to alleviate unwanted loop currents. The transmitter section connects to a receiver section which increases the signal power and applies it as a drive to the power semiconductor switch (11). An isolated power supply powers the circuit from the same powerline which is switched by the power semiconductor switch (11). |
