Power generation controller of vehicle power generator
First Claim
1. A power generation controller of a vehicle power generator, comprising:
- a rectifier for converting an alternating current (AC) power to be generated by a wound-field type synchronous generator to a direct current (DC) power for supply to an electrical load and a battery;
rotation speed calculation means for calculating a rotation speed of the synchronous generator;
a field switching element for performing ON/OFF switching of voltage application to a field winding of the synchronous generator;
voltage detection means for sampling a voltage of the battery or a DC-side voltage of the rectifier in synchronization with a periodic sampling signal based on a reference clock;
duty range setting means for setting a range (duty range) appropriate to an ON/OFF ratio of the field switching element based on the rotation speed calculated by the rotation speed calculation means;
control duty computation means for computing the ON/OFF ratio of the field switching element based on the duty range set by the duty range setting means for agreement between the voltage sampled by the voltage detection means and a power generation target voltage; and
field PWM drive means for calculating an ON/OFF timing for the field switching element with a predetermined interval based on the reference clock from the ON/Off ratio computed by the control duty computation means, and generating a field switching signal for driving the field switching element.
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Abstract
The present invention relates to a power generation controller of a vehicle power generator, which includes: voltage detection means for sampling a voltage of a battery based on a reference clock signal; duty range setting means for setting a range for an ON/OFF ratio of a field switching element from the rotation speed of the power generator; control duty computation means for computing the ON/OFF ratio of the field switching element based on thus set duty range from a deviation between a power generation target voltage and voltage information as a result of sampling; and field PWM drive means for controlling the ON/OFF switching operation of the field switching element with an interval based on the reference clock signal from the computed ON/OFF ratio.
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Citations
5 Claims
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1. A power generation controller of a vehicle power generator, comprising:
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a rectifier for converting an alternating current (AC) power to be generated by a wound-field type synchronous generator to a direct current (DC) power for supply to an electrical load and a battery;
rotation speed calculation means for calculating a rotation speed of the synchronous generator;
a field switching element for performing ON/OFF switching of voltage application to a field winding of the synchronous generator;
voltage detection means for sampling a voltage of the battery or a DC-side voltage of the rectifier in synchronization with a periodic sampling signal based on a reference clock;
duty range setting means for setting a range (duty range) appropriate to an ON/OFF ratio of the field switching element based on the rotation speed calculated by the rotation speed calculation means;
control duty computation means for computing the ON/OFF ratio of the field switching element based on the duty range set by the duty range setting means for agreement between the voltage sampled by the voltage detection means and a power generation target voltage; and
field PWM drive means for calculating an ON/OFF timing for the field switching element with a predetermined interval based on the reference clock from the ON/Off ratio computed by the control duty computation means, and generating a field switching signal for driving the field switching element. - View Dependent Claims (2, 3, 4, 5)
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Specification