A resolver excitation circuit with hiccup protection

Abstract

The invention discloses a resolver excitation circuit with hiccup protection, comprising an operational amplifier circuit and a push-pull power amplifying circuit which are successively connected. Twodiodes connected in series in opposite directions are disposed at the base of a power amplifying transistor of the push-pull power amplifying circuit. A power supply supplies current through the diodes connected in series in opposite directions. Thus, the on / off state of the push-pull power amplifying circuit can be controlled through the diodes connected in series in opposite directions, therebyachieving a purpose of controlling the positive and negative excitation outputs of the resolver. The resolver excitation circuit is subjected to short-circuit protection by controlling the on / off state of the push-pull power amplifying circuit, the power amplifying transistor is protected, a control strategy is simplified, and the circuit cost is saved. The resolver excitation circuit, by the hiccup design of the short-circuit protection control signal, thoroughly turns off the transistor of the push-pull power amplifying circuit when the resolver excitation is short-circuited to the ground or the power supply, thereby further protecting the resolver excitation circuit.

Description

technical field [0001] The invention relates to a resolver excitation circuit, in particular to a resolver excitation circuit with hiccup protection. Background technique [0002] In the AC servo control system, in order to achieve high-performance closed-loop control of the motor, it is particularly important to obtain accurate and reliable rotor position and speed. The resolver can simulate the rotor angle and speed signals of the motor, and transmit them to the motor controller for analysis and processing. For automotive-grade motor control systems, due to strong vibration, high pollution and other factors, the resolver has an irreplaceable position for other angle sensors. In the field of electric vehicles, the resolver excitation signal on the main control board is usually transmitted to the resolver at the rear end of the car using a signal line without fixed terminals. At this time, it is easy to cause a short circuit between the positive and negative excitation of t...

AI Technical Summary

Problems solved by technology

However, if the excitation is short-circuited to the power supply, the push-pull negative triode is over-current but the positive triode is not, the short-circuit protection cannot be triggered, and the triode may fail due to excessive current.

And the reset circuit needs to reset the chip, which increases the circuit cost

In addition, by outputting the reset pulse to the decoding chip to turn off the excitation signal, the short-circuit protection delay is longer, and the resolver excitation cannot be automatically restored after the short-circuit fault disappears, and the circuit control strategy becomes complicated.

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