The excitation power supply of the resolver is composed of a single OPA2541

Indicates the wiring
circles of the two power amplifiers A and B of OPA2541. Pin 5 and pin 1 of the output terminal are connected to both ends of the original side of the resolver , using the bridge connection method. Amplifier
A is connected to a Wien bridge oscillator, and the nonlinear resistance characteristics of the incandescent lamp EL are used to
control the loop gain to maintain the output voltage unchanged. By R. , Rt, C-, C: The network forms
a positive feedback active filter, which determines the frequency of the output sine wave. Wind IR, determines amplifier
B gain. Four diode clamps protect the output voltage. R. C,,RsC． Used to
suppress noise signals. The excitation power supply composed of OPA 2541 has good temperature stability . When the temperature changes by 60'C, the output voltage changes only 0.05%.