The principal objects of the present invention are: to provide a voltage regulator tester which overcomes the aforementioned difficulties; to provide such a tester having a circuit for testing automotive voltage regulators which includes a test load that draws an amount of electrical current comparable to the amount drawn by the alternator field coil with which the regulator is normally used, thereby giving a true indication of the regulator's performance; to provide a circuit of such configuration that accurate voltage readings and the cut-off voltage are easily taken or observed; to provide such a circuit of which the components thereof are not subjected to severe strain; to provide a circuit capable of testing a great variety of automotive voltage regulators; to provide a voltage regulator tester which is economical to manufacture, accurate, versatile, and durable in use, and which is particularly well adapted for its intended use.
In the disclosed embodiment of the present invention, the reference numeral 1 generally designates a voltage regulator tester adapted to ascertain the operability of automotive voltage regulators 2. In an automotive electrical system, a battery 3 supplies current to the electrical accessories of a vehicle. Use of accessories, including the starter, spark plugs, lights, signals, etc., drains away the electrical potential of battery 3; therefore, an alternator 6, driven by the engine crank shaft, is employed to replenish the lost potential.
According to a disclosed class of innovative embodiments, there is provided: An automotive voltage regulator, comprising: a connection for receiving a battery voltage signal at a first input; a first amplifier connected to provide current at an alternator field-winding output connection if said battery voltage signal drops below a desired value; a second amplifier which is also operatively connected to monitor the voltage on said battery voltage input, and to disable said first amplifier into voltage on said battery voltage input rises above a maximum possible value, and connected to disable said first amplifier accordingly.
According to another disclosed class of innovative embodiments, there is provided: An automotive voltage regulator, comprising: a connection for receiving a battery voltage signal through a battery sensing cable; a first amplifier connected to provide current at an alternator field-winding output connection if said battery voltage signal drops below a desired value; means for detecting the occurrence of a breakage in the battery sensing cable connection and for disabling said first amplifier when said breakage occurs; and means for detecting disconnection of said regulator and said alternator field winding, and for disabling said first amplifier when such disconnection occurs.
What the designer should know: introduction to Automotive Linear Voltage Regulator
|3.9 MB||17 Jul 2014|