JPS58133136A - Charger for vehicle - 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] When the battery is fully charged, the power generation pressure decreases and the power generation display shows. The present invention provides a device that prevents four lights from being turned on.

FIG. 1 shows a conventional configuration. In the figure, the voltage regulator 2 detects the voltage of the buffer battery 3 during normal operation and controls the transistor B1, and when the battery voltage detection terminal 2016 or the terminal 101 is disconnected or the battery positive electrode side connection 801 is disconnected, the voltage regulator 2 detects the voltage of the buffer battery 3 and controls the transistor B1. detects the generated voltage at the terminal 208 and controls the transistor 2l. Further, the power generation indicator 6 is configured to turn on when power generation is stopped and the voltage VL of the power generation voltage detection terminal 202 falls below a preset level /l/VC.

By the way, when the current flowing to the external load 6 suddenly decreases, the battery voltage vB is set by the voltage regulator gK and the adjusted voltage is V$ because the generated current is charged to the buffer battery 8.
In this case, when the battery 8 is fully charged, the transistor 2l is turned off. Until then, the excited coil IvI
The excitation current flowing through BK is flywheel diode 2.
Discharge through 2. At this time, the transistor 21 is turned off.
When the time becomes longer than the discharge time of the excitation current, no voltage is generated in the alternator. Therefore, when Vlg1 eventually becomes conductive and the transistor 21 becomes conductive, the AC generator 1 starts generating power again, but the voltage at the terminal 202 is Vt until the generated voltage reaches Vc.

Since the voltage is lower than Vc, the power generation indicator 5 lights up. Furthermore, if the AC generator v/lsl rotates at a low speed when the battery 8 is fully charged and the current flowing through the external load 6 is small, the OFF time of the transistor 21 becomes longer and a similar intermittent period occurs. As described above, under certain conditions, the power generation display 'a5' lights up even though everything is operating normally.

In order to eliminate the above-mentioned storage shortage, the present invention provides a voltage regulator with a differential voltage V (B-L
By providing a voltage detection circuit '@2 for detecting l = Vs- and a first voltage detection circuit for detecting battery voltage, and configuring the power generation state to be controlled according to the outputs of these voltage detection circuits. , as mentioned above (from [#J Honorable Mention)]
An object of the present invention is to provide a vehicle charging device that prevents a power generation indicator from lighting up under specific conditions.

Embodiments of the present invention will now be described with reference to the drawings.

In FIG. 2, l is an alternating current generator equipped with an initial excitation resistor 14, a backflow prevention diode 13, excitation diodes 15 to 17 forming an auxiliary rectifier 10B, and a main rectifier lOm. 2 is a voltage regulator, which includes a transistor 21.2 that controls the excitation current of the alternator L. It is composed of a flywheel diode 22 and a voltage adjustment circuit 28. In the voltage adjustment circuit 28, the PNP fungistor 286, the diode 284.887, g88, and the resistor 807°808 are set to the reference difference voltage Vd of the difference voltage V(1-L) between the buffer voltage v1 and the generated voltage VL of the terminal 202. and transistor g86 conducts when V(1-L)<V d (D,
V(BL)) Non-conducting at Vd. Here, control of the transistor 21 by detecting the differential voltage V(1-L) is possible only when the transistor g82 is conductive, that is, when the battery 8 is fully charged. The difference voltage V(B-
The transistor 286 which is the output of the detection circuit of
The output of this AND circuit causes the transistor g81. ) The configuration is configured to control the fungistor 21.

Therefore, first, the operation from when the alternating current generator l starts generating power until it reaches the normal @electric state will be explained.

@At the beginning of the period, the battery 3 is not fully charged, so the transistor 232 is non-conductive and the patch! J3no!
[Pressure V B To J 1,202 (7)! [Difference between pressures Vi,
Regardless of the voltage V (B-L>
When the voltage becomes higher than +, charging of the battery 8 and supply of current to the load 6 begin. In a normal power generation state, the Vi+ (VL and PNP) transistor 286 is conductive, and the photoelectric voltage applied to the battery 8 from the alternating current generator 1 is detected from the terminal 201 to control the transistor 21. In addition, if the terminal 201 + terminal 101° positive electrode side connection 801 of the battery 8 is disconnected and the charging voltage of the alternator 1 cannot be detected from the terminal 201, the generated voltage is detected from the terminal 202 and the transistor 21 is controlled. .

Next, it flows to the external load 6 [the flow decreases rapidly and this 1f
When tltJ is charged to battery 3 and battery 8 is fully charged, or when battery 8 is fully charged and the alternator l is rotating at low speed, the current flowing to load 6 is small. When 8 is fully charged, transistor 21
A case will be described in which the OFF time is long and the power generation pressure of the alternator 1 is reduced. When the battery 8 is fully charged and the transistor 282 turns on, the transistor 21
is turned off, but the excitation current flowing through the excitation coil IIK circulates through the flywheel diode 2B and is discharged. Since the alternating current power generation III generates power in accordance with this discharge current, the power generation pressure VL at the terminal 20B gradually decreases. Vi until the difference voltage V(1-L) between the voltages VB and VL of the puff pastry 8 exceeds the set value Vd.

When the voltage decreases, the transistor g86 turns off, so the transistor 281 also turns 0FFL), and the fungistor 21 turns on. In this way, when the transistor 8 is fully charged, the transistor 2
1 is 0FFL, and when running, Y(1-L> is detected, and before the excitation current is completely discharged through the flywheel diode 22, the transistor 21 is turned on, so power generation continues, and the voltage VL at the terminal 202 becomes the power generation indicator. It will not drop to the 504-light region.

FIG. 8 shows another embodiment of the voltage regulator 2. Diodes 234, 288. PNP) Fungistar 286, resistance 80
7,808 detects the difference voltage between the battery voltage VB and the voltage VL of the terminal 202.

A similar effect can be achieved by using an AND circuit configuration in which the output drives a transistor 289 connected in series with a transistor 281 driven by detection of the charge voltage VB of the battery 8.

Further, as shown in FIG. 4, a voltage obtained by dividing the voltage Vi of the battery 3 by resistors 81!3, 314 and a voltage obtained by dividing the generated voltage VL of the terminal 202 by resistors 811. By comparing with v! A configuration may also be adopted in which the transistor 21 is controlled by detecting a voltage difference between 1 and VL and driving the transistor 240 with the output thereof.

In the embodiment shown in FIG. 2, the power generation indicator 5 is connected to the terminal 20.
Terminal 20 if the device is driven according to the generated voltage of 2.
2 and the terminal 204. ! ! Figure, 3rd
In the embodiment of the voltage regulator 2 shown in FIGS. 1 and 1, the structure may be such that there is no protection circuit provided by the diodes 284 and 285° resistor 806 when the charging voltage of the battery 8 cannot be detected at the terminal 201.

As explained above, in the present invention, the voltage V m of the battery 8
At the time of test %i1, V 1iKXtle terminal 20
B's output lA pressure VLO differential lpressure V(1-L) (,=Vl-V
By configuring the outputs of these eight detection circuits into a mu ND circuit and controlling the transistor gl with the output of the AND circuit, when the battery 8 is fully charged, V(1- L) Control the transistor 21 according to K, and turn on the transistor 21 when VL becomes lower than the set voltage Vd with respect to Vm. Set voltage V at this time
d, the battery 8 is fully charged and the transistor 81 is turned off.
! ! The differential voltage generated between the battery 8 and the terminal gog,=' when the AC generator l has completely stopped generating electricity is also made small, and the voltage difference between the transistor 2 and
86 is 0FFI, so choose it.

Therefore, even if the battery 3 is fully charged and the transistor 21 is oyy, the low F of the power generation voltage is reduced to V(kl-
Since the transistor 21 is turned ON by detecting the voltage at the terminal 2-02, the power generation is completely stopped and the voltage at the terminal 2-02 does not fall to the lighting area of the power generation display 5, and the external load 6
When the supply current to the alternator 10 suddenly decreases and the battery 3 becomes fully charged, or when the battery 8 is fully charged and the alternator 10
It is possible to prevent the power generation indicator 5 from lighting up when the current flowing through the load 6 is small when the rotation speed is low.

[Brief explanation of drawings]

FIG. 1 is a schematic electrical diagram of an apparatus showing a conventional example, FIG. 2 is an electrical circuit diagram showing an embodiment of the present invention, and FIG. FIG. 44 is an electrical circuit diagram without another embodiment of the voltage regulator according to the present invention. l... AC generator, 2... Voltage regulator, 8... Battery, 1... Ignition switch, 6... Power generation indicator, 6... External load, 288,301. gos
...Zener diode, resistor, resistor, 286, 28? which forms the main part of the first voltage detection circuit? , 238,808
...A transistor forming the main part of the second voltage detection circuit. Diode, diode, resistor. Representative Patent Attorney Takashi Okabe

Claims (1)

[Scope of Claims] A charging stirrup for a nine-vehicle vehicle comprising a voltage regulator for controlling an alternating current generator provided with a support rectifier and an auxiliary rectifier, and a power generation indicator that operates according to the output of the auxiliary rectifier, is provided with a first voltage detection circuit that detects the battery voltage of the charging battery, and a second voltage detection circuit that detects the voltage difference between the generated voltage of the alternator and the battery voltage, and both voltage detection circuits. A photoelectric device for a vehicle, characterized in that it is configured to control power generation according to the output of the vehicle.