# US 4,398,140 A · Control apparatus for charging generator

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- Number: US 4,398,140 A
- Document ID: US4398140A
- Status: Granted
- Kind: A
- Application number: 06/364,628
- Filed: 1982-04-02
- Granted: 1983-08-09
- Earliest claimed: 1979-09-18
- Assignees: Mitsubishi Denki Kabushiki Kaisha
- Inventors: Mitsuharu Morishita
- Web page: https://patentgrep.com/patent/US4398140A

## CPC

- H02J 7/24: using discharge tubes or semiconductor devices
- H02J 7/975: {in response to temperature}
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

A control apparatus for a charging generator for charging a battery comprises a first temperature detecting element having a positive temperature coefficient which detects the variation of ambient temperature of a voltage regulator to impart a negative temperature gradient to the voltage adjusting characteristic of the voltage regulator and a second temperature detecting element having a negative temperature coefficient which detects the self-heating of the generator or the voltage regulator during operation to impart a positive temperature gradient to the voltage adjusting characteristic so as to control the output voltage of the generator. This control apparatus has a dynamic characteristic permitting the adjusted voltage to increase so as to compensate the voltage drop in the external load characteristic; thus an excellent charging characteristic of the battery can be attained.

## Claims

### Claim 1

In a control apparatus for a charging generator comprising a battery charged by a rectified output of an AC generator having a field coil and a voltage regulator for controlling a field current passing through the field coil to control the output voltage of the generator in a predetermined value, an improvement which comprises;
a parallel combination of a first resistor and a first thermistor having a positive temperature coefficient which detects the variation of ambient temperature of the voltage regulator to impart a negative temperature gradient to the voltage adjusting characteristic of the voltage regulator,
said first thermistor being thermally isolated from the generator and the voltage regulator, and
said voltage regulator comprising a series combination comprising second, third and fourth resistors connected to said parallel combination and a second thermistor connected in parallel with said fourth resistor and having a negative temperature coefficient which detects the self-heating of the generator or the voltage regulator during the operation to impart a positive temperature gradient to the voltage adjusting characteristic.