Voltage regulator of AC generator

Abstract

This invention relates to a voltage adjuster of an AC generator including a virtual value and its mean value evaluation circuit of three-phase voltage, a voltage primary circuit, a voltage ring comparing adjuster, a current ring comparing adjuster, a PWM generation and drive circuit, an excitation current limit and protection circuit, a load current limit circuit, in which, said voltage adjuster can realize the feedback control of the virtual value of the output voltage with the functions of feed back control of excitation current, load current limit, limit of excitation current and overcurrent protection.

Description

1. Technical field [0001] The invention relates to a highly integrated field effect tube alternator voltage regulator with functions such as excitation current feedback control, high-precision load current limit, excitation current limit, excitation current overcurrent protection, etc. , armored vehicles and other 115V / 200V three-phase AC power supply system. 2. Background technology [0002] Generator voltage regulators are important components on aircraft, ships and vehicles, and have always been valued by the production sector. Switch-tube generator voltage regulators are widely used due to their advantages of small size, light weight, low loss, high voltage regulation accuracy and fast dynamic response. [0003] The switch-tube alternator voltage regulator usually uses the transformer to sample the three-phase output voltage, and then controls the on-off of the switch tube through circuits such as conditioning, error amplification, PWM generation, and drive to control t...

AI Technical Summary

Problems solved by technology

These methods all use the negative feedback of the average value of the output voltage to stabilize the effective value of the output voltage, and do not directly stabilize the effective value of the output voltage.

The first method requires a rectifier and a large capacitor for filtering. To reduce the ripple, a full-bridge rectifier must be used, and the capacitor value must also be increased.

This not only increases and enlarges the device, making the generator voltage regulator larger and heavier, but also the change of the output voltage frequency directly affects the size of the feedback signal ripple

The second method also requires a rectifier, whose switching frequency is completely determined by the output voltage frequency, and has high requirements on the output waveform of the generator. When a high reactive load is connected, the voltage regulation effect of the voltage regulator will inevitably deteriorate.

At present, most generator voltage regulators are implemented with discrete components, and their protection functions and load current limiting functions are not perfect or too simple

Discrete components are greatly affected by the environment and manufacturing accuracy, which makes the voltage regulation accuracy of the generator voltage regulator and the protection point and load current limit curve unstable

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