JPH0646195Y2 - Magnet type AC generator voltage regulator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a voltage regulator for a magnet type AC generator mounted on an automobile or the like, and in particular, regulates a battery voltage and an AC load voltage with high accuracy and opens a battery. In this case, an inexpensive device having a function of preventing destruction of a battery DC load due to overvoltage is provided.

FIG. 1 is a conventional circuit diagram of this type of regulator. 1 is a magnet type AC generator, 2 is a switch, 3 is an AC load, C is an AC load voltage detection circuit, and 13 is a half of the battery of the generator. Second rectifier with control pole (hereinafter thyristor) connected in the forward polarity in the cycle, 14 is the first rectifier with control pole (hereinafter thyristor) for charging the battery, 20 is a battery, 21 is a DC load is there.

In this operation, when the voltage of the AC load 3 rises due to the output of the generator 1, the detection circuit C detects the voltage and gives a signal to the control pole (hereinafter referred to as the gate) of the thyristor 13, and Short circuit the cycle and control the voltage of 3 to rise excessively. Also, the voltage of the battery 20 and the DC load 21
When the voltage rises, the voltage between the gate and anode of the thyristor 14 drops, so the signal sent to the gate of the thyristor 14 is cut off, the thyristor 14 is turned off, and the voltage of the battery 20 and the DC load 21 rises excessively. Control of.

However, in the conventional circuit, when the battery 20 is opened, the thyristor 14 is ignited before the current flows through the load 21 to reach the set voltage, and the output of the alternator 1 is applied to the load 21 to overload the load 21. May be destroyed by.

The present invention provides a highly reliable regulator that suppresses an overvoltage applied to a load when the battery is open, which is a conventional drawback.

FIG. 2 is a circuit diagram showing an embodiment of the present invention, and the same reference numerals as those in the conventional example show the same parts. The present invention is characterized in that a control circuit B that operates when the battery 20 is open is provided, as is clear from the conventional example. 23 is a rectifier with a control electrode (thyristor), 22 and 24 are resistors, and 25 is a zener diode. The case when the battery is open will be described below with reference to FIG.

The voltage generated by the generator 1 is applied to the anode of the thyristor 14 and also through the resistor 17 and the diode 16
Is energized to provide a half-wave DC output. When the output voltage rises and exceeds the voltage of the Zener diode 25, the gate current of the thyristor 23 flows through the resistor 24 and the thyristor 23 becomes conductive. As a result, the generator output is short-circuited and the voltage rise of the load 21 is suppressed.

Therefore, the voltage of the load 21 is suppressed to the voltage of the Zener diode 25 or less, and it is possible to prevent the electronic load from being damaged due to overvoltage.

As is apparent from the above description, according to the present invention, a highly reliable device can be obtained even in the case of an abnormality such as when the battery is open, so that the practical effect is great.

[Brief description of drawings]

FIG. 1 is a basic circuit diagram of a conventional diagram, and FIG. 2 is a circuit diagram of an embodiment of the present invention. In the figure, 1 is an AC generator, 2 is a switch, 3 is an AC load, 13, 14 and 23 are thyristors, 20 is a battery, 21 is a DC load, 15, 17, 22 and 24 are resistors, 16 and 18
Is a diode, 19 and 25 are zener diodes, C is a voltage detection circuit, and B is a control circuit according to the present invention.

Claims (1)

[Scope of utility model registration request] 1. A first rectifier with a control pole connected to a battery charging circuit, an AC load connected to an intermediate tap end of a generator, and a half cycle output not used for charging the battery of the generator. A second rectifier with a control pole connected in parallel with the center tap of the generator in the forward polarity, and in the forward polarity in parallel with the output end of the generator in the half cycle output for charging the battery of the generator When a connected third rectifier with control pole, a circuit for detecting the AC load voltage and controlling the second rectifier with control pole, and a DC load voltage are detected, and the detected voltage reaches a predetermined value, A voltage regulator for a magnet type AC generator, comprising a signal circuit for bringing the third rectifier with control pole into conduction.