Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
246 words
A voltage control apparatus for an a.c. generator for automobiles, characterized by an a.c. generator (1) having an armature winding (101) and a field winding (102), a rectifier (2) to rectify the output of the a.c. generator to charge a battery (12), a voltage detection circuit (8,9) to detect the voltage of the battery (12), a constant voltage circuit (5) to generate a constant voltage on the basis of the voltage of the battery through the operations of a key switch (6), a reference voltage circuit (4) comprising at least two sets of a resistance type voltage dividing circuit and/or a resistance type voltage dividing circuit including a diode (405,406,409,410) which divides the constant voltage of the constant voltage circuit (5), and a diode (411,412) connected between each voltage dividing point (413,414,415) of the at least two sets of the resistance type voltage dividing circuit so that a voltage reduction rate of a divided voltage is changed depending on a low temperature region lower than a first predetermined temperature, a high temperature region higher than a predetermined second temperature and a middle temperature region between the points of the predetermined first and second temperature, and a voltage control circuit (3) which compares the voltage of the voltage detection circuit (8,9) with the voltage of the reference voltage circuit (4) and controls a field current to the field winding (102) depending on a difference in the comparison to thereby make the voltage of the battery (12) constant.
Claim 2
Dependent Claim
246 words
A voltage control apparatus for an a.c. generator for automobiles, characterized by an a.c. generator (1) having an armature winding (101) and a field winding (102), a rectifier (2) to rectify the output of the a.c. generator to charge a battery (12), a voltage detection circuit (8,9) to detect the voltage of the battery (12), a constant voltage circuit (5) to generate a constant voltage on the basis of the voltage of the battery through the operations of a key switch (6), a reference voltage circuit (4) comprising at least two sets of a resistance type voltage dividing circuit and/or a resistance type voltage dividing circuit including a diode (405,406,409,410) which divides the constant voltage of the constant voltage circuit (5), and a diode (411,412) connected between each voltage dividing point (413,414,415) of the at least two sets of the resistance type voltage dividing circuit so that a voltage reduction rate of a divided voltage is changed depending on a low temperature region lower than a first predetermined temperature, a high temperature region higher than a predetermined second temperature and a middle temperature region between the points of the predetermined first and second temperature, and a voltage control circuit (3) which compares the voltage of the voltage detection circuit (8,9) with the voltage of the reference voltage circuit (4) and controls a field current to the field winding (102) depending on a difference in the comparison to thereby make the voltage of the battery (12) constant.
Claim 3
Dependent Claim
207 words
The voltage control apparatus according to claim 1, characterized in that the reference voltage circuit (4) comprises a resistance type voltage dividing circuit having a first voltage dividing point (413), which divides the constant voltage of the constant voltage circuit (5) by voltage dividing resistors (401,402), a first resistance-diode type voltage dividing circuit having a second voltage dividing point (414) which divides the constant voltage by voltage dividing resistors (403,404) and diodes (405,406), a second resistance-diode type voltage dividing circuit having a third voltage dividing point (415) which divides the constant voltage by voltage dividing resisitors (407,408) and diodes (409,410), and first and second diodes (411,412) respectively connected between the first and second voltage dividing points (413,414) and between the first and third voltage dividing points (413,415) so as to have polarities opposite to each other in such a manner that a potential at the first voltage dividing point (413) is not changed even by a rise in temperature in the low temperature region; the potential at the first voltage dividing point is rendered to be a negative characteristic to temperature in the middle temperature region; and a voltage reduction rate of the potential at the first voltage dividing point is changed is the high temperature region.
Claim 4
Dependent Claim
122 words
The voltage control apparatus according to claim 2, characterized in that the second voltage dividing point (414) has a negative voltage-temperature characteristic to a temperature of electrolyte in the battery and is so determined that the potential at the second voltage dividing point equals to the difference between the potential at the first voltage dividing point (413) and the forward drop voltage of the first diode (411), and the third voltage dividing point (415) has a positive voltage-temperature characteristic to the temperature of the electrolyte and is so determined that the potential at the first voltage dividing point equals to the sum of the potential at the first voltage dividing point (413) and a forward drop voltage of the second diode (412).
Claim 5
Dependent Claim
63 words
The voltage control apparatus according to one of claims 1 to 3, characterized in that the voltage control circuit (3) is provided with a comparator (303) which has a positive terminal connected to the voltage dividing point (13) of the resistance type voltage dividing cricuit (8,9) and a negative terminal connected to the voltage dividing point (413) of the reference voltage circuit (4).