JPS6051421A - Controller for automotive 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] -1- The present invention is fli! The present invention relates to a control system for an 11-car charging generator that maintains a constant battery charging voltage by controlling I.

This type of control device (hereinafter referred to as a regulator) uses switching means such as a power transistor to control the field winding current of a rotating charging generator connected to the engine.
The generated voltage is kept constant regardless of the engine speed using N-OF control.

By the way, if a large electrical load is used for the idler U11, where the engine speed is low, in order to keep the generated voltage of the generator constant, the conduction time of the transistor increases and heats up. At the same time, the field gA winding also generates heat, raising the temperature of the generator, and the temperature of the regulator, which is integrated therewith, rapidly rises due to the addition of the heat generated by the transistor. At this time, the amount of air blown by the generator cooling fan, which rotates in proportion to the engine rotation, is also small.

In anticipation of such adverse conditions, conventional heat dissipation measures have been taken such as attaching particularly large heat dissipation fins to regulators, or separating the heat generating parts, but these measures take up a lot of installation space. This led to increase in size and cost.

In view of the above-mentioned problems, the present invention eliminates the need to take special heat dissipation measures, thus reducing installation space and cost.
It is an object of the present invention to provide a control device for a dual charging generator.

That is, the control device of the present invention is provided with temperature detection means for detecting the temperature of the control device, and energization limiting means for limiting energization to the switching means above a predetermined temperature. .

In addition, the heat dissipation structure of the control device can be simplified by preventing heat generation in the switching means and the like under the above-mentioned bad lines f1.

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows the first embodiment of this invention, in which 1 is a charging power generator I, 2 is a Ray-2 generator, 3 is a battery, and 4 is a battery.
1 is an electric load, and 5 is a key switch. The 1 degree regulator 2 has a voltage control circuit 21, and the control circuit 21 controls the charge when the engine rotates 1! through a switching power transistor 2-3-2. The amount of power generated by the power generation II 1 is controlled by controlling the energization to the field winding 11 of the generator 1. No. 5, the control circuit 21 uses a comparator 211 to control the battery charging voltage vb and the constant voltage VC. Compare, charging voltage vb is constant voltage VC
If it is lower, the charging voltage vb is increased by making the transistor 22 conductive and increasing the charging ω of the photoelectric machine 1.
On the other hand, when the charging voltage Vb is higher than the constant voltage VcJ, the transistor 22 is rendered non-conductive. J to this
:The charging voltage Vb is made to match the constant voltage VC regardless of the fluctuation of the engine speed or the increase/decrease in the electrical direction 4.

Further, the regulator 2 is provided with an energization limiting circuit 23. The limiting circuit 23 consists of a comparator 231 and a transistor 232 connected to its output side. The positive input terminal of the comparator 231 receives a divided voltage Vt generated by the thermistor 2/I and the resistor 25 as wetness tα detection means, and the constant voltage Va is input into the negative input terminal. Also, 1
The collector of helangistor 232-4- is connected to the base of transistor 22. Note that the resistance of the thermistor 24 decreases as the humidity increases.

In the regulator 2 having such a structure, the generating capacity of the generator 1 is small when the engine is idling at a low speed, and if a large electric load 4 is used here, the regulator 1
The node 2 makes the conduction time of the transistor 22 overwhelmingly long in order to maintain the charging voltage vb constant, and as a result, the
The transistor 22 rapidly generates heat.

At the same time, the field winding 11 also generates heat due to the excitation current, and the temperature of the generator 1 rises. Since the cooling fan's opening speed is also small, the temperature rises rapidly.

At this time, the resistance value of the thermistor 24 gradually decreases due to the rise in temperature, and the divided voltage Vt increases accordingly. Therefore, when the voltage Vt exceeds the constant voltage va, 1
~ Transistor 232 is made conductive and transistor 2 is turned on.
The base potential of transistor 22 decreases by -5-, and transistor 22 is forced to become non-conductive.

As a result, the overheating condition of regulator 2 is resolved.
Temperature decreases. When the divided voltage Vt becomes lower than the constant voltage Va, the transistor 232 becomes non-conductive, and thereafter the transistor 22 is controlled by the voltage control circuit 21 again.

FIG. 2 shows a comparison of the maximum temperature rise at each engine speed of such a regulator with a conventional example. In the figure, line X represents the present invention, and line y represents the conventional example. As is known from the figure, conventionally large heat dissipation fins were installed to suppress the maximum temperature rise in the low rotation range NL of the J-stiff engine to below the limit temperature to prevent heat dissipation such as Otherwise, the design has excessive heat dissipation. On the other hand, in the present invention, in the low rotation range NL, the switching transistor is made non-conductive as described above to control the temperature rise to a predetermined temperature (TS in the figure) which is lower than the limit temperature (Tm in the figure). Therefore, the maximum increase in humidity at each engine speed other than the low speed range NL may be higher than the conventional one, and therefore a simpler heat dissipation design than the conventional one can be achieved.

As described above, the regulator of the present invention is equipped with a no-mister that detects the temperature TR of A, and also has a switching transistor that controls the energization of the field winding of the generator when the temperature exceeds the limit value. By providing an energization control circuit that forcibly de-energizes the circuit, special heat dissipation measures can be taken, such as attaching large heat dissipation fins to the regulator, or separating switching transistors that generate heat from other circuits by H1. Therefore, the installation space is small and the cost is low.

Incidentally, since the state in which a large electrical load is used in the engine speed range 11 (rev. Even if the power generation of Jffilfil 1 is stopped, problems such as battery 3 being overcharged will not occur.

FIG. 3 shows a second embodiment of the invention. The energization limiting circuit 23 is provided with a sawtooth wave light 11 circuit 233, and a sawtooth wave 233-7-a which repeats at a predetermined period P as shown in FIG. Ru. Other configurations are”−
This is the same as in the embodiment of distribution 1. When the temperature of the 1 degree regulator 2 rises and the divided voltage Vt exceeds the voltage Va, the voltage Vt increases to 1 degree through the 1 degree transistor 232 to The conductivity of 22 gradually decreases, and when the voltage Vt exceeds Va, it becomes non-conductive as in the first embodiment.

Such a configuration has the same effect as the first embodiment, and also reduces the burden on the battery 3 when the energization limiting circuit 23 is activated, compared to the first embodiment in which the transistor 22 is immediately turned off. It's small, and the temperature fluctuation of regulator 2 at this time is also small.

As shown above, Potmei's control device for vehicle charging generators detects the temperature of the control unit, and when the temperature exceeds the set temperature, the conduction of the switching means is restricted to prevent overheating of the control device.
This allows the heat dissipation structure to be easily assembled, which is extremely advantageous in terms of space and cost.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a control device according to a first embodiment of the present invention, and FIG. FIG. 3 is a circuit diagram of a control device showing a second embodiment of the present invention, and FIG. 4 is a diagram showing an output waveform of a sawtooth wave generation circuit. 1... Charging generator 11...Field winding 2...Control device (regulator) 22...
... Switching means 23 ... Energization limiting means 24 ... Temperature detection means −〇 −

Claims (1)

[Claims] (1) Vehicle charging Rm ljl by switching means
Vehicle charging generator control t! that controls the field winding current of t! to keep the output voltage of the generator at the set voltage. In B, the vehicle is characterized in that it is provided with a temperature detection means for detecting the temperature of the control I device, and is also provided with an energization restriction means for restricting the energization by the switching means described in -1 in "-1" above a predetermined temperature. Control device for charging generator. (2) The control device for a vehicle charging generator according to claim 1, wherein the energization limiting means is set to render the switching means non-conductive at temperatures below a predetermined temperature. (3) The energization limiting means reduces the conductivity of the switching means as the temperature rises above a predetermined temperature.
A control device for a vehicle charging generator as set forth in claim 1.