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US 4,127,782 AGranted
Automotive power supply
AssigneeSawafuji Electric Co., Ltd.
InventorsMorikazu Omura, Yukio Okuda
Life of this patent
Estimating the term…
Abstract
An automotive power supply comprising a generator which produces a voltage when an engine is in operation, a main battery which drives a starter motor, an auxiliary battery which functions as a power source for direct current equipment in a vehicle, and a d-c voltage booster circuit which boosts the voltage produced in the generator to supply the auxiliary battery; wherein, in charging the main and auxiliary batteries in parallel by the voltage produced in the generator, the supply voltage to the auxiliary battery is boosted by compensating the line voltage drop between the generator and the auxiliary battery.
Claims16
An automotive power supply comprising
- a generator which generates voltage when an engine is operated,
- a main battery which drives a starter motor, and
- an auxiliary battery which acts as a power source for automotive d-c equipment, the main and auxiliary batteries being charged in parallel by the generator, wherein an isolating means and a d-c booster circuit are provided between the main and auxiliary batteries so as to charge the auxiliary battery by boosting the supply voltage to the auxiliary battery during the operation of the engine and to isolate the electric circuit between the two batteries when the engine is stopped, wherein the d-c booster circuit comprises a separately excited inverter circuit.
An automotive power supply comprising
- a generator which generates voltage when an engine is operated,
- a main battery which drives a starter motor,
- an auxiliary batter which acts as a power source for automotive d-c equipment, and
- a d-c booster circuit having at least one semiconductor element, the main and auxiliary batteries being charged in parallel by the generator, wherein an isolating means and the d-c booster circuit are provided between the main and auxiliary batteries so as to charge the auxiliary battery by boosting the supply voltage to the auxiliary battery during the operation of the engine and to isolate the electric circuit between the two batteries when the engine is stopped, and wherein the semiconductor element is determined so as to perform switching in the level at which the voltage drop in the element is substantially zero when the output current of the d-c booster circuit is less than the rated current and to perform switching in the level at which the voltage drop in the element is substantially not zero when the output current of the d-c booster circuit is more than a predetermined current.
1 more element
An automotive power supply comprising
- a generator which generates voltage when an engine is operated,
- a main battery which drives a starter motor, and
- an auxiliary battery which acts as a power source for automotive d-c equipment and which has substantially the same terminal voltage as the main battery, the main and auxiliary batteries being charged in parallel by the generator, wherein an isolating means and a d-c booster circuit are provided between the main and auxiliary batteries so as to charge the auxiliary battery by boosting the supply voltage to the auxiliary battery during the operation of the engine and to isolate the electric circuit between the two batteries when the engine is stopped, and wherein the d-c booster serves to compensate the wire drop between the main battery and the auxiliary battery;
- said d-c booster circuit comprising a self-excited inverter circuit and
- wherein the d-c booster circuit has at least one semiconductor switching element, said semi-conductor switching element being determined so as to perform switching in the level at which the voltage drop in the element is substantially zero when the output current of the d-c booster circuit is less than the rated current and to perform switching in the level at which the voltage drop in the element is subatantially not zero when the output current of the d-c booster circuit is more than a predetermined current.
2 more elements
An automotive power supply comprising
- a generator which generates voltage when an engine is operated,
- a main battery which drives a starter motor, and
- an auxiliary battery which acts as a power source for automotive d-c equipment, the main and auxiliary batteries being charged in parallel by the generator, wherein an isolating means and a d-c booster circuit are provided between the main and auxiliary batteries so as to charge the auxiliary battery by boosting the supply voltage to the auxiliary battery during the operation of the engine and to isolate the electric circuit between the two batteries when the engine is stopped, wherein a controlling portion of d-c booster circuit which controls the oscillation of the d-c booster circuit and the voltage detecting portion of auxiliary battery are provided, and the isolation of the d-c booster circuit is controlled by the results detected by the voltage detecting portion of auxiliary battery.
Dependencies are inferred from the claim text.