Control circuit for rectifier, has phase voltage measuring device with respective resistors and diodes, and tapping voltage between resistor and diode, where free contacts of resistors are linked to respective supply voltage terminals

摘要

The circuit has a phase voltage measuring device with a series connection of a resistor (Ru3) and diode (D1), and taps measuring voltage (umess) between the resistor and the diode. A free contact of the diode is linked to a power supply voltage, and a free contact of the resistor is linked to a supply voltage terminal (P15). Another device has another resistor (Rv3) and diode (D2), and taps another voltage (vmess) between the resistor and the diode (D2). The free contact of the diode (D2) is linked to another voltage and the free contact of the latter resistor is linked to another terminal.