VOLTAGE REGULATING SYSTEM FOR VEHICLE GENERATORS

• US 3,820,009 A
• Filed: 12/12/1972
• Issued: 06/25/1974
• Est. Priority Date: 12/18/1971
• Status: Expired due to Term

• Current Assignee: Katsutaro Iwaki, Katumi Itoh, Kazumasa Mori
• Original Assignee: Katsutaro Iwaki, Katumi Itoh, Kazumasa Mori
• Inventors: Itoh, Katumi, Mori, Kazumasa, Iwaki, Katsutaro
• Primary Examiner(s): Trammell, James D.
• Application Number:
  US05/314,455
• Time in Patent Office: 560 Days
• Field of Search: 322/28,99,73 320/48,31,39,64
• US Class Current: 322/28
• CPC Class Codes: H02J 7/163 with special means for initiating or limiting the excitation current

Abstract

A voltage regulating system for vehicle generators of the type in which a voltage across the terminals of a battery is detected to thereby effect on-off control of the field current of an alternator for charging the battery in accordance with the detected voltage. The voltage regulating system includes a voltage control circuit for detecting the terminal voltage of the battery to effect on-off control of the field current, the on-off control action of said voltage control circuit having a hysteresis characteristic, and an astable multivibrator circuit connected to said voltage control circuit, whereby the duration of flow of the field current is always limited to less than one oscillation period of said multivibrator circuit, thereby effectively preventing oscillation from being caused in said voltage control circuit.

Claims

1. A voltage regulating system for vehicle generators connected to an alternator for controlling a charging voltage of a battery, said voltage regulating system comprising:

a switching circuit for detecting a battery voltage and effecting on-off control of a field current of said alternator in accordance with a plurality of set voltages, said switching circuit having a switching hysteresis characteristic; and

an oscillator circuit connected to said switching circuit to continuously generate a signal voltage at a predetermined constant period, said oscillator circuit being connected to said switching circuit to interrupt the field current of said alternator at a predetermined period.

2. A voltage regulating system according to claim 1, wherein said switching circuit comprises a reference diode for detecting a power supply voltage, a first transistor circuit connected to said reference diode and adapted to become conductive and nonconductive in accordance with the conduction and nonconduction of said diode, a second transistor circuit connected to interrupt said field current upon the conduction of said first transistor circuit, and a feedback circuit connected between an input to said first transistor circuit and an output of said second transistor circuit.

3. A voltage regulating system according to claim 1, wherein said oscillator circuit comprises an astable multivibrator circuit, and a circuit for reshaping an output of said astable multivibrator circuit into a more exact rectangular waveform.

4. A voltage regulating system according to claim 2, wherein said oscillator circuit comprises an astable multivibrator circuit, a circuit for reshaping an output of said astable multivibrator circuit into a more exact rectangular waveform, and a delay circuit connected between an input terminal of said first transistor circuit and an output terminal of said astable multivibrator circuit to effect a transition from one set voltage to another of said switching circuit at the expiration of a predetermined time after the occurrence of an output signal of said astable multivibrator circuit.