JPS6137880B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a checker for a semiconductor regulator, and particularly to a checker suitable for an IC (integrated circuit) regulator installed in an AC generator (alternating current generator) for an automobile or the like.

For conventional generator disconnection detection, JP-A-1986-
No. 60265 is known. AC generator (below)
Abbreviated as ACG. ) When checking the failure of the IC regulator built in the ACG, check by rotating the ACG or by rotating the IC regulator
It was necessary to remove it from the However, such conventional checking methods require a device to rotate the ACG, and removal is laborious and time-consuming.

The present invention can be used to rotate ACG or to rotate IC from ACG.
To provide a checker that can easily check an IC regulator without removing the regulator.

The present invention has a resistor that applies voltage to the field winding of the ACG, applies the charge/discharge voltage of the capacitor to the input of the IC regulator, and determines the quality of the regulator by measuring it with a terminal voltmeter of the capacitor. It is characterized by being configured to.

The present invention will be explained below with reference to illustrative embodiments. In the figure, A shows the ACG assembly with a built-in IC regulator B, 1 is the armature winding of the ACG, 2 is the field winding of the ACG, 3 is the full-wave rectifier for AC output rectification, and 4 is the auxiliary diode for excitation. It is.

When the key switch 5 is turned on in the ACG mounted on the vehicle, the base current flows to the transistor 7 via the resistor 6 in the IC regulator B, which turns on the transistor 7 and turns the field winding 2 on.
An initial excitation current flows to turn on the charging indicator light 8. When the rotational speed of the ACG increases, the voltage generated in the armature 1 is converted to direct current by the full-wave rectifier 3, and the voltage is output to the on-board battery 9 via the output terminals 10 and 11.
is charged. When the voltage increases, output terminal 11
and the voltage of the excitation voltage application terminal 12 becomes equal,
The charging indicator light 8 goes out. On the other hand, regulator B
Voltage control is performed by detecting the voltage of the battery 9 using resistors 14 and 15 through the voltage detection terminal 13 of the regulator, and when the voltage increases, the Zener diode 16 and transistor 17 are turned on, and conversely, the transistor 7 is turned off, and the field The current in the magnetic winding 2 decreases, the output voltage of the ACG becomes lower, and voltage control is performed.

As you can see from the above explanation, ACG with built-in IC regulator usually has +- output terminal 1.
0, 11, an initial excitation/charge display terminal 12, and a voltage detection terminal 13 are provided in advance for external connection.

The present invention provides a checker that can easily check the IC regulator B by using only these terminals without requiring rotation of the ACG.

In the embodiment shown below, the vehicle battery 9 is used as it is as a power source. In the figure, 19 is an input switch, and 20 is a DC-DC converter, the output voltage of which is set to be 1.5 to 2 times the regulated voltage of regulator B relative to the input voltage of battery 9. A capacitor 23, a voltmeter 24, and a voltage detection terminal 13 of an IC regulator B are connected to an output terminal of the DC-DC converter 20 via a resistor 21 and a diode 22. On the other hand, the resistor 25 is
It is connected to the terminal 12 via the input terminal of the DC-DC converter 20 . From terminal 12, base resistor 2
6. Connected to a transistor 28 via a Zener diode 27.

Next, the operation of the checker having the above configuration will be explained.

When the switch 19 is turned on, current flows through the resistor 25, the terminal 12, the field winding 2, and the transistor 7 if the IC regulator B is normal. At this time, the resistance 25 is set to a larger value (5 times or more) than the resistance value of the field winding 2, and the Zener diode 27
By selecting an appropriate Zener voltage, the voltage at terminal 12 becomes less than the breakdown voltage of Zener diode 27, transistor 28 is turned off, and capacitor 23 is charged by the output of DC-DC converter 20. , the terminal voltage of the capacitor increases.

When the voltage at the voltage detection terminal 13 becomes equal to or higher than the adjustment voltage of the regulator B due to this voltage increase, the Zener diode 16 and the transistor 17 are turned on, and conversely, the transistor 7 is turned off, so that the terminal 1
Since the voltage of the battery 9 increases and becomes equal to the voltage of the battery 9, the Zener diode 27 and the transistor 28 are turned on, and charging of the capacitor 23 is stopped. Therefore, the charge stored in the capacitor 23 is discharged through the resistors 14 and 15 and the voltmeter 24.

When the voltage at the voltage detection terminal 13 becomes lower than the regulated voltage of the regulator B, the above-described operation is repeated, and the voltmeter 24 indicates the regulated voltage of the regulator B.

By the way, a possible failure mode of the IC regulator B is that the transistor 7 is short-circuited or opened. As a criterion, in the former case, that is, in the case of a short circuit, the transistor 28 remains off, so the indication on the voltmeter 24 is lower than the DC-DC converter 20.
shows almost the same value as the output voltage of Further, in the case of an open circuit, the transistor 28 is held in an on state, so that the indication of the voltmeter 24 indicates approximately the voltage division ratio of the resistors 21 and 29. In this manner, in the checker of the present invention, checking of the IC regulator B can be easily performed using only the external terminal of the ACG.

It should be noted that the above-described checker performs the check using an external terminal, and therefore cannot confirm whether the field winding 2 is disconnected. However, for such a disconnection check of the field winding 2, if the structure is such that the collector terminal of the transistor 7 can be connected by inserting a test pin etc. from outside the ACG,
With the checker of the present invention, including disconnection of the field winding 2,
100% check is possible.

In addition, in this embodiment, an on-vehicle battery 9 is used as a power source.
However, if a constant voltage power supply is used including the DC-DC converter 20, it is possible to make the circuit configuration even simpler.

As described above, according to the present invention, the regulator can be easily checked using only the external terminal provided on the ACG without rotating the ACG or removing the IC regulator from the ACG.

[Brief explanation of the drawing]

The figure is an electric circuit diagram showing the configuration and connection state of an alternating current generator equipped with an IC regulator and a checker of the present invention. A...AC generator, B...IC regulator,
C...Checker for IC regulator, 2...Field winding, 12...Charging display terminal, 13...Voltage detection terminal, 20...DC-DC converter, 22, 28
...Transistor, 24...Voltmeter.

Claims (1)

[Claims] 1. In a checker for checking the presence or absence of a failure in a semiconductor regulator that controls the output of an automotive alternating current generator, a switch that applies DC voltage from an on-board battery to the field winding of the generator via a resistor; , a DC-DC converter that is connected to the vehicle battery via the switch, generates an output voltage higher than the battery voltage, and applies the output voltage to the voltage detection terminal of the regulator, and the resistor and field winding. Detects the voltage at the connection point with the DC
- a semiconductor switching means connected in parallel to the output terminal of the DC converter; a hold circuit having a capacitor connected in parallel to the semiconductor switching means and holding the voltage of the DC-DC converter; A checker for a regulator of an automotive alternating current generator, characterized in that it is provided with a display means for displaying a terminal voltage.