JPH05153799A - Automotive generator - Google Patents

Abstract

PURPOSE:To provide an automotive generator having a low voltage output and a high voltage output with a stopper added to stop the generation when an overvoltage or an overcurrent is present in a high voltage output. CONSTITUTION:The automotive generator comprises both or one of a high voltage output overcurrent detector 19 and an overvoltage detector 11 for a low voltage output and a high voltage output, and means 21 or 30 for interrupting both of the low and high voltage outputs or the high voltage output when the overcurrent or the overvoltage is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted device having a function capable of supplying DC high-voltage power to a conventional vehicle-mounted power generator that supplies DC low-voltage power to a battery or an electric device mounted on the vehicle. Power generator.

[0002]

2. Description of the Related Art Conventionally, as an in-vehicle power generator, a real-life model has been developed.
No. 87182, a DC low voltage power of DC 12V or DC 24V is supplied to a battery or a plurality of electric devices, and an AC or DC high voltage is supplied to an electric pot, an electric stove, an electric rice cooker, or the like. A device having a function for supplying electric power has been devised.
FIG. 2 is a diagram showing an example disclosed in Japanese Utility Model Laid-Open No. 55-87182. The low-voltage AC output induced by the low-voltage armature coil 13 is rectified by the low-voltage side rectifier 3 to supply power to the battery 4 and the DC low-voltage driven electric device 5.
On the other hand, the AC high voltage output drawn from the high voltage armature coil 14 is connected from the terminal 15 to the high voltage driving loads 16 and 17 and the outlet 18 to supply high voltage power.

[0003]

SUMMARY OF THE INVENTION In the above-described conventional vehicle-mounted power generator, when an abnormality such as a vehicle collision, insulation deterioration due to long-term use, short-circuit on the load side, or the like increases,
Alternatively, there is a risk that the generator may be burned or the equipment may be destroyed because a safety device for stopping the power generation is not provided when the voltage increases due to a runaway of the DC high voltage power generation due to a disconnection between the generator and the battery.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an on-vehicle power generator which is provided with measures for preventing accidents such as burnout of the generator or destruction of the device when an abnormality occurs.

[0005]

In order to achieve the above object, a vehicle-mounted power generator according to the present invention comprises a high voltage output overcurrent detection device and / or an overvoltage detection device, and an overcurrent detection device. Alternatively, it is provided with means for cutting off both the low voltage output and the high voltage output or only the high voltage output when an overvoltage is detected.

[0006]

When the overvoltage occurs due to the abnormality of the high voltage output system, the overvoltage detection device outputs the overvoltage signal. When an overcurrent is detected, the overcurrent detection device outputs an overcurrent signal. Upon receiving the overvoltage signal and the overcurrent signal, the output cutoff device stops the high voltage output to prevent the generator from being burnt or the device being destroyed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a vehicle-mounted power generator according to the present invention. 1 is a field coil wound around a rotor, 13 is a low voltage armature coil wound in a three-phase star shape on an armature core, and 3 is a rectified AC output generated in the low voltage armature coil 13. Low-voltage side rectifying device, 4 for low-voltage power battery, 5 DC low-voltage drive electric device,
Reference numeral 14 is a high-voltage armature coil connected in series to the low-voltage armature coil 13, 7 is a high-voltage side rectifier that rectifies the AC output generated in the high-voltage armature coil 14, and 8 is a DC high-voltage driven electric device. , 11 are overvoltage detection devices that output an overvoltage signal when the DC high voltage exceeds a predetermined value. Reference numeral 12 is a means for detecting a current flowing through the electric device 8 driven by a direct current high voltage, which uses a current detection resistor as an example, but other methods are also conceivable.

Reference numeral 19 is an overcurrent detection device which detects an overcurrent from the voltage generated in the current detection means 12 and outputs an overcurrent signal. Reference numeral 20 is an overvoltage signal and an overcurrent signal output from the overvoltage detection device 11 and the overcurrent detection device 19. An output cutoff device that receives a current signal and outputs a DC high voltage power output stop signal, 2
Reference numerals 1 and 30 denote an excitation switch and an output switch that interrupt the excitation current or high voltage output of the field coil 1 by the output stop signal output from the output interruption device 20. When the exciting current is cut off by the exciting switch 21, both the low voltage output and the high voltage output are stopped, and when the output switch 30 is opened, only the high voltage output is stopped. Which case to select is designed and selected according to the application of the power generation device. The ground portion shown in FIG. 1 is connected to the vehicle body.

The operation of the circuit configured as described above will be described with reference to FIG. As means for detecting and comparing the DC high voltage, resistors 22 and 23 for dividing the DC high voltage, resistors 24 and 25 for setting the overvoltage setting potential, and comparison for comparing the DC high voltage dividing potential a and the overvoltage setting potential b If the divided potential a exceeds the overvoltage setting potential b from the comparator 26, the comparator 26
Output goes high or low. In addition, as a means for detecting and comparing the current flowing through the electric device 8 driven by the DC high voltage,
When the detection potential c obtained from both ends of the current detection resistor 12 exceeds the overcurrent setting potential d obtained from the resistors 27 and 28 for setting the overcurrent setting potential, the output of the comparator 29 becomes high or low. The output breaking device 20 receives either or both of the output of the comparators 26 and 29 or the overvoltage signal (high or low) and the overcurrent signal (high or low) obtained by other means, and the excitation switch 21 or the output. By opening the switch 30, it is possible to stop power generation in the event of an abnormality and improve safety. At this time, as a method of operating the output cutoff device 20, a method of continuously holding an overvoltage or overcurrent signal and holding the excitation switch 21 or the output switch 30 open,
Alternatively, a method of opening the exciting switch 21 or the output switch 30 only when the signal is continuously generated within a preset time, or a method of opening the exciting switch 21 or the output switch 30 only when receiving the signal A method of opening the can be considered.

[0010]

According to the present invention, in a vehicle-mounted power generator having a low voltage output and a high voltage output, an overvoltage is caused to flow through a DC high voltage driven electric device by a DC high voltage detecting means connected to the DC high voltage. Detecting the overcurrent from the means for detecting the current, respectively, from the signal obtained from the overvoltage detection device and the overcurrent detection device, a device for stopping the output of both the low voltage output and the high voltage output or only the high voltage output is provided, Stops power generation when there is an abnormality such as a vehicle collision, insulation deterioration due to long-term use, short-circuit on the load side, or an increase in current, or when an overvoltage occurs due to a runaway DC high-voltage power generation due to a disconnection between the generator and battery By doing so, it is possible to prevent the generator from being burnt or the device being destroyed.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of an in-vehicle power generator of the present invention.

FIG. 2 is a circuit diagram of a conventional vehicle-mounted power generator.

[Explanation of symbols]

3 Low voltage side rectifier (low voltage output) 7 High voltage side rectifier (high voltage output) 11 Overvoltage detector 13 Low voltage armature coil (low voltage output) 14 High voltage armature coil (high voltage output) 19 Overcurrent detection Device 20 Output breaker (means for shutting off output) 21 Excitation switch (means for shutting off both low voltage output and high voltage output) 30 Output switch (means for shutting off only high voltage output)

Claims (1)

[Claims] 1. A low voltage output, a high voltage output, a high voltage output overcurrent detection device and / or an overvoltage detection device, and a low voltage output when an overcurrent or overvoltage is detected. An in-vehicle power generator equipped with means for cutting off both high voltage output or only high voltage output.