Duty ratio control for a vehicular generator responsive to low and high power loads
First Claim
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1. A generating apparatus for a vehicle equipped with a key switch and a regular vehicle load including a battery and a high power load to be connected for a short time, said apparatus comprising:
- a generator having a field coil and an armature coil;
a voltage regulator, having a switching transistor connected to said field coil and a voltage detecting circuit connected across said battery, for regulating output voltage of said generator to a suitable voltage level;
first means connected to said voltage detecting circuit for detecting a connection of said high power load with said generator;
second means for disconnecting said high power load from said generator within said short time; and
third means connected to said switching transistor for controlling a duty ratio of said transistor so that said generator generates limited power when said high power load is not connected to said generator and unlimited power when said high power load is connected to said generator.
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Abstract
Duty ratio of a power switching transistor connected to the field coil is controlled according to whether or not a high-power load is connected. When the high power load is not connected, the duty ratio is made 60%, for example, so that excessive power not generated. On the other hand, when the high power load is connected, the duty ratio is increased to 100% so that full power is generated by the generator. The power switching transistor is also controlled according to the battery voltage in a well known manner.
35 Citations
17 Claims
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1. A generating apparatus for a vehicle equipped with a key switch and a regular vehicle load including a battery and a high power load to be connected for a short time, said apparatus comprising:
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a generator having a field coil and an armature coil; a voltage regulator, having a switching transistor connected to said field coil and a voltage detecting circuit connected across said battery, for regulating output voltage of said generator to a suitable voltage level; first means connected to said voltage detecting circuit for detecting a connection of said high power load with said generator; second means for disconnecting said high power load from said generator within said short time; and third means connected to said switching transistor for controlling a duty ratio of said transistor so that said generator generates limited power when said high power load is not connected to said generator and unlimited power when said high power load is connected to said generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 12, 13, 14, 15, 16)
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9. A generating apparatus for a vehicle equipped with a regular vehicle load including a battery and a high power load to be connected for a short time, said apparatus comprising:
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a generator having a field coil for generating output power to be supplied to both said regular vehicle load and said high power load for at least said short time; first means for detecting connection of said high power load with said generator; second means for disconnecting said high power load from said generator within said short time; and third means for limiting said output power of said generator to less than a maximum amount to be generated when said high power load temperature is higher than a preset level and when said high power load is not connected to said generator. - View Dependent Claims (11, 17)
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Specification