JP2504023B2 - Voltage regulator for vehicle charging generator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a voltage regulator for a vehicle charging generator, and more particularly to a voltage regulator capable of appropriately responding to an abnormality in a battery charging system during engine operation.

[Prior Art] The voltage regulator is an alternative switch that normally selects and operates an engine control device such as a choke heater at the time of power generation of a charging generator and selects and operates a charge lamp at the time of non-power generation. Means are provided and an example thereof is disclosed in Japanese Utility Model Laid-Open No. 61-113552. Transistors Q5 and Q6 in FIG. 2 of this publication correspond to the switch means.

[Problems to be Solved by the Present Invention] In the above-described conventional voltage regulator, when the power generation is stopped due to the disconnection of the rotor coil or the like, the transistor operates and the current is immediately charged by the choke heater even during engine operation. Switch to the lamp. Therefore,
There was a problem that the idle speed of the engine became too high due to the choke valve returning and rotating.

The present invention solves such a problem. When an abnormality of the battery charging system occurs during engine operation, the charge lamp is turned on to notify the abnormality, and the engine control device such as the choke heater is not turned off. Therefore, it is an object of the present invention to provide a voltage adjusting device for a vehicle charging generator that does not cause a malfunction in engine operation.

[Means for Solving Problems] The configuration of the present invention will be described with reference to the drawings. The voltage adjusting device 1 that controls the power generation of the vehicle charging generator 2 and holds the battery charging voltage at a predetermined value includes A switch means 11 for selectively selecting and energizing the engine control device 4 is provided, and the switch means 11 is operated at a predetermined duty ratio by detecting a failure occurrence of a battery charging system during engine operation. It is provided with a switch drive means 12 for setting.

[Operations and Effects] In the voltage regulator 1 having the above configuration, when an abnormality occurs in the battery charging system during engine operation, the switch drive means
12 operates the switch means 11 at a predetermined duty ratio, whereby the charge lamp 3 and the engine control device 4 are alternately energized at the duty ratio.

Thus, the lighting of the charge lamp 3 informs the driver of the abnormality of the battery charging system, and the energization operation state of the engine control device 4 is also maintained, so that the engine operation is not disturbed.

[Embodiment] In the figure, an operating power source is supplied to a voltage regulator 1 from a battery 6 via a key switch 5, and a transistor 101 is operated by feeding back an output of a vehicle charging generator 2. That is, the transistor 10
1 is operated by a transistor 103 having a Zener diode 102 on the base side to ON-OFF control the current of the rotor coil 21 of the charging generator 2, and keeps the output of the charging generator 2 constant.

The voltage regulator 1 includes a key switch closing detection circuit 104, an excitation operation detection circuit 105, which constitutes a switch driving means,
A power generation detection circuit 106 is provided, and the key switch closing detection circuit 104 is connected to the key switch 5 and outputs a "1" level output when the key switch 5 is closed. The excitation operation detection circuit 105 is connected to the collector of the transistor 101, detects the excitation of the rotor coil 21 due to the periodic decrease of the collector voltage, and outputs the "1" level output.

The power generation detection circuit 106 is the stator coil 2 of the vehicle charging generator.
The two-phase output is input to detect the power generation state, the "a" level output is generated from the a terminal during power generation, and the transistor 107 connected to the b terminal is operated at a fixed cycle during non-power generation. Transistor 107 is connected to the base of transistor 101 to activate it.

In the figure, 108, 109 and 110 are NOT gates, 111 and 112 are AND gates, and 113 and 114 are OR gates. A reset circuit 115 is activated by the "1" level output of the OR gate 113 and resets the output of the hold circuit 116 to the "0" level.
The output of the hold circuit 116 is input to the OR gate 114.

The output of the key switch closing detection circuit 104 is input to the AND gate 112 and the NOT gate 109, and the output of the excitation operation detection circuit 105 is input to the AND gate 111. Also, the a terminal output of the power generation detection circuit 106 is the OR
Inputs to gate 114 and NOT gate 108.

The output of the AND gate 112 is input to the hold circuit 116 and also to the NOT gate 110, and the NOT gate 110
Activates the transistor 117 which is a switching element. The collector of the transistor 117 is connected to the sawtooth wave oscillation circuit 119 through the resistor 118, and the circuit outputs a sawtooth wave varying between 2V and 5V. The collector voltage of the transistor 117 is input to the “+” terminal of the comparator 120.

A reference voltage generation circuit 121 is connected to the “−” terminal of the comparator 120, and the abnormality detection circuit 12 is connected to the circuit 121.
The output of 2 is input. The abnormality detection circuit 122 detects the battery voltage by a sensing line (not shown) and knows the abnormality of overcharge or overdischarge of the battery 6, and in this case, outputs a "1" level output to the reference voltage generation circuit 121.

The reference voltage generation circuit 121 that receives the “1” level output is 1
It emits 3.5V voltage output instead of V voltage output.

The switch means 11 is composed of transistors 123, 124, 125 and 126, and according to the output of the comparator 120, the transistor 125 and the transistor 1 whose emitters are connected to each other.
26 is activated selectively. A charge lamp 3 is provided between the connection point and the key switch 5, and a choke heater 4 is provided between the connection point and the ground.

In the voltage regulator 1 having the above-described configuration, when the engine is stopped, it is in the non-power generation state, so that the transistor 107 and the transistor 101 are operated in a constant cycle by the output of the terminal b of the power generation detection circuit 106, and a predetermined rotor coil current is supplied. . The a terminal output of the power generation detection circuit 106 is "0".
Since the output of the excitation operation detection circuit 105 is at "1" level, the reset circuit 115 operates and the hold circuit output 116 becomes "0" level. AND gate output 112
Becomes "0" level and the transistor 117 becomes conductive, and its collector voltage becomes 1 V or less. As a result, the output of the comparator 120 becomes "0" level and the transistor 123
Is turned off, the transistor 126 is turned on, and the charge lamp 3 is turned on.

When the engine is started and the stator coil 22 starts to generate power, the power generation detection circuit 106 has the a terminal output at the "1" level and the b terminal output at the "0" level. Then, after that, the operation of the transistor 101 is controlled by the transistor 103, and the output voltage of the charging generator 2 is held at a predetermined regulated voltage determined by the Zener diode 102. In this case, the output of the AND gate 112 becomes the "1" level, the output of the hold circuit 116 is inverted to the "1" level, and the transistor 117 becomes non-conductive. Then, a sawtooth wave appears at the "+" terminal of the comparator 120, which is always higher than the reference voltage of 1V, so that the transistor 123 becomes conductive and is conducted to the choke heater 4 through the transistor 125. At this time, the charge lamp 3 is the transistor 126
Is turned off when is turned off.

When the power generation of the stator coil 22 is stopped due to the disconnection of the rotor coil 21 during the engine operation, the a-terminal output of the power generation detection circuit 106 becomes "0" level, but at the same time, the output of the excitation operation detection circuit 105 also becomes "0" level. And AND gate 11
The output of 1 maintains the "0" level. Therefore, the hold circuit 116 is not reset and the non-conduction state of the transistor 117 is maintained. When the battery 6 is over-discharged due to no output of the charging generator 2, the abnormality detection circuit 122 outputs a "1" level output and the reference voltage generation circuit 123.
Output voltage rises to 3.5V.

As a result, about 50% of the sawtooth wave input to the "+" terminal of the comparator 120 becomes lower than the output voltage input to the "-" terminal, and the transistor 123 is operated at a duty ratio of 50% to cause the transistor 123 to operate. 125 and 126 are alternately conducted in a constant cycle, the charge lamp 3 is turned on, and the choke heater 4 is continuously energized.

As described above, even if an abnormality occurs in the battery charging system during engine operation, the choke heater is not stopped and the engine operation is not affected.

In the above embodiment, even when the battery 6 is overcharged for some reason during engine operation, the abnormality detection circuit
The output voltage of the reference voltage generating circuit 121 is raised by the output of 122, and the charge lamp 3 is turned on. At this time, of course, the energization of the choke heater 4 is continued.

The excitation of the rotor coil may of course be directly detected by directly detecting the current of the rotor coil instead of being detected by the change in the collector voltage of the transistor as in the above embodiment.

The power generation can be detected by the neutral point voltage of the stator coil or the output ripple voltage of the charging generator.

In addition, the alternating energization of the transistors 125, 126 is not always
It is not necessary to do it at 50% duty.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a voltage adjusting device showing an embodiment of the present invention. 1 ... Voltage adjusting device 11 ... Switch means 12 ... Switch driving means 106 ... Generation detection circuit 116 ... Hold circuit 117 ... Transistor (switching element) 119 ... Sawtooth wave oscillation circuit 120 ... Comparator 121 ... Reference voltage generation circuit 122 ... Abnormality detection circuit 3 ... Charge lamp 4 ... Choke heater (engine control equipment) 6 ... Battery

Claims (3)

(57) [Claims] 1. A voltage adjusting device for controlling power generation of a vehicle charging generator to maintain a battery charging voltage at a predetermined value, comprising a switch means for selectively selecting and operating a charge lamp and an engine control device. In a voltage regulator provided, switch drive means for detecting a failure occurrence of a battery charging system during engine operation and operating the switch means at a predetermined duty ratio is provided. Voltage regulator. 2. The switch driving means includes a power generation detecting means for detecting power generation of a vehicle charging generator to detect engine operation start, a hold circuit for storing engine operation, and an oscillating circuit for outputting a sawtooth wave having a constant cycle. A comparator, a switching element that operates by the output of the hold circuit to input the sawtooth wave of the oscillation circuit to one input terminal of the comparator, an abnormality detection circuit that detects an abnormality occurrence in the battery charging system, and an abnormality And a reference voltage generating circuit that receives the detection signal and changes and sets the reference voltage of the other input terminal of the comparator so as to cross the sawtooth level, and operates the switching means by the output of the comparator. The voltage adjusting device for a vehicle charging generator according to claim 1. 3. The voltage adjusting device for a vehicle charging generator according to claim 1, wherein the engine control device is a choke heater.