JPS6022429A - Voltage regulator for charging generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a voltage regulating device for a charging generator, and particularly to a voltage regulating device for a charging generator that has a function of warning a prefectural power supply such as a generator mounted on an automobile. Regarding equipment.

[Background of the invention]

A voltage regulator for a charging generator for an automobile has a function of detecting a break in the circuit connecting the generator and the storage battery and notifying the user of the break. For example, the applicant has already proposed a method of calculating the difference between the generator voltage and the storage battery voltage and detecting when this value exceeds a certain set value. (See Japanese Patent Application No. 58-19807). However, this device has the disadvantage that it requires the use of one comparator, one differential amplifier, and eight resistors to detect this disconnection (or disconnection), making the circuit complex.

[Purpose of the invention]

An object of the present invention is to provide a voltage regulator for a charging generator that can achieve the same detection effect as the prior art with a smaller number of elements and reduce the cost of the circuit. - [Summary of the Invention] The voltage regulator of the present invention focuses on the point that the power supply voltage of the storage battery does not rise suddenly even if the connection line that leads the rectified power generation output to the storage battery is disconnected or disconnected. ,
It is characterized in that an abnormality is detected by detecting the ratio between the generator output voltage and the storage battery power supply voltage.

[Embodiments of the invention]

An embodiment of the present invention will be explained with reference to Figures 8g1 and 2. FIG. 1 is a system diagram of a power source for an automobile, in which the three-phase AC output from the armature winding 1 of the generator is converted into DC by a three-phase full-wave rectifier 3.4, and charges a storage battery 9. The auxiliary rectifier 5 supplies all of the direct current to the field winding 2 of the generator and loads 12 such as auto chokes and heaters. The voltage regulator 6t is the one according to the present invention, which controls the charging voltage by turning on and off the ah operation of the generator, and also detects disconnection of the connection line 1], and in the event of an abnormality, the t:1 charging display month. 7 lights up to give an alarm and completely stop the generator's power generation. FIG. 2 shows an embodiment of the voltage regulator 6, in which the power transistor 1
3, flywheel diode 14, AND circuit 16, holding circuit 17, comparators 18, 19, constant voltage diode 20
, and each resistor 21, 24-29.

In the above configuration, when the key switch 8 is turned on, an initial excitation current flows from the storage battery 9 through the charging indicator light 7, the field winding 2, and the power transistor 13. In this state, the voltage of the S terminal connected to the positive electrode of the storage battery 9 ( Usually 14.7
The output of the comparator 18 is at a high level because it is larger than the value obtained by dividing the voltage (approximately V) by the resistors 26 and 27. Also, comparator 1
9 outputs a high level when the voltage VL on the cathode side of the auxiliary rectifier 50, that is, the L terminal, is low, and therefore the AND circuit 1
The output of the transistor 6 is at a high level, and the power transistor 13 is in an ON state. When the generator starts generating electricity in this excited state, the voltage applied to the storage battery 9, that is, the voltage v8 at the terminal S increases, the output of the comparator 1B becomes a low level, and the power transistor 13 becomes OFF'. As a result, the field current is attenuated through the flywheel diode 14, and the generator output voltage 'α is reduced to t. When the output voltage of the generator becomes low, the voltage of the storage battery 9 becomes low, the voltage of the S terminal becomes low, the output of the comparator 18 becomes a high level, and the power transistor 13 is turned ON again to increase the voltage of the generator. . By repeating the above operation, the storage battery 9Fi is controlled to a constant voltage vl. This constant voltage V++m is expressed as follows from the voltage Vx of the constant voltage diode 20 and the resistance values R44 to R127 of the resistors 24 to 27.

The voltage adjustment operation of this device has been described above. Next, the case where the connection line B in FIG. 1 is disconnected will be explained with reference to FIGS. 3 to 5. Figure 3 shows time t on the horizontal axis and voltage V at the L terminal on the vertical axis.
Switch 11 with 1 load and 10 f t =
When the voltage is suddenly changed from ON to OFF at s t 1, the generator voltage vL temporarily increases as shown by a solid line 31, and returns to the original value Vss under the control of the voltage adjustment circuit 6. On the other hand, if the connection line B is disconnected at 1=11, if the comparator 19 shown in FIG. 2 does not operate, Vb will rise as indicated by the dotted line 32 due to the generator load disappearing. Figure 4 similarly shows the voltage Vs at terminal 8, and when switch 11 is on, VL
However, when the connection line B is disconnected, the charging current is cut off and gradually decreases as shown by the dotted line 42. Therefore, when the switch 11 is suddenly changed from ON to OFF', the ratio VL/V- remains constant at approximately 1 as shown by the solid line 51 in Fig. 5, but when the connection line B is disconnected. Sometimes, as shown by dotted line 52, V x, /
V- rises. The present invention takes advantage of this property,
The comparator 19 in FIG. 2 detects VL/Vs, and under the following conditions, the output voltage of the comparator 19 is set to a low level, the power transistor 13 is set to 0FIi', power generation is stopped, and at the same time the charging indicator light 7 lights up to warn you.

Note that when the output of the holding circuit 17Fi and the comparator 19 becomes low and becomes a bell, this is held to ensure that the generator stops generating electricity.

As is clear from the above, according to this embodiment, instead of the conventional one comparator, one differential amplifier, and eight resistors, one comparator 19 and six resistors are required. Resistors 24-29
It is possible to realize an equivalent circuit using only the above-described method, and a significant reduction in the number of circuit elements can be achieved.

〔Effect of the invention〕

According to the present invention, disconnection or disconnection of the output line of the generator can be reliably detected with a simple circuit, and the cost of the device can be reduced.

[Brief explanation of drawings]

FIG. 1 is an automatic power supply system diagram, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIGS. 3 to 5 are operation explanatory diagrams. 1... Armature winding, 2... Field winding, 3.4...
Three-phase full-wave rectifier, 5... Auxiliary rectifier, 6... Voltage regulator, 7... Charging indicator, 9... Storage battery, 16...
・AND circuit, 17...Holding circuit, 18.19...
Comparator, 20... Constant voltage diode, 24-29...
・Voltage dividing resistor. Agent Patent Attorney Akio Takahashi

Claims (1)

[Scope of Claims] 1. Voltage comparison means for stopping power generation by the charging generator and driving charging warning means when the voltage ratio of the output voltage of the charging generator to the storage battery voltage exceeds a predetermined value. A voltage regulating device 1M for a charging generator, characterized by comprising: 2. The voltage comparison means includes a first resistance voltage divider circuit that divides the output voltage of the charging generator, a second resistance voltage divider circuit that divides the storage battery voltage, and the first and second voltage dividers. 2. The voltage regulating device for a charging generator according to claim 1, further comprising a comparator for comparing the magnitude of the output voltage of the voltage circuit. 3. It is characterized by comprising a holding circuit for holding the output signal of the voltage comparing means, which is output when the voltage ratio exceeds the predetermined value, at least until the rotation of the generator stops. A voltage regulator for a charging generator according to claim 1.