JPS61210900A - Power generation controller - Google Patents

Abstract

PURPOSE:To suitably limit the output current of a generator irrespective of the state of an electric load of a battery by providing switching means for limiting the maximum output current of the generator independently of a field current controller due to a voltage detection. CONSTITUTION:When an output voltage becomes a set value or higher, a Zener diode 6d becomes ON and a transistor 7 is closed. Accordingly, a power transistor 9 is opened to stop generating power. When the output voltage decreases, the diode 6d becomes OFF, and the transistor 9 again closes. The transistor 7 is intermittently interrupted by the conduction rate in response to an output limit request signal A from an exterior by a conduction rate controller 12d and an oscillator 12c. Thus, the output current of the generator can be readily and suitably limited regardless of the states of a battery and an electric load.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention limits the output current of a generator by controlling the field current independently of field current control using voltage detection. The present invention relates to a power generation control device for a variable current generator for a vehicle.

[Conventional technology]

BACKGROUND ART Conventionally, a method of lowering the control voltage has been used to limit the output of a generator for the purpose of temporarily lowering the drive torque of the generator or suppressing a temperature rise.

[Problems that the invention attempts to solve]

However, in the conventional method, the output current of the generator changes to various values depending on the battery condition and the electric load condition in order to limit the voltage, so it is not an appropriate method to limit the output of the generator. There wasn't.

The present invention has been made to solve these problems, and an object of the present invention is to provide a power generation control device that can easily and appropriately limit the output current of a generator regardless of the state of the electrical load on the battery.

[O means to solve the problem]

The power generation control device according to the present invention is provided with a switching means using an oscillator that controls the field current independently of the field current control circuit based on voltage detection and limits the large output current of the generator. be.

[For production]

In this invention, the switching means using an oscillator has a conduction rate determined by an external signal, and limits the field current independently of the field current control circuit based on voltage detection, thereby limiting the maximum output of the generator. do.

〔Example〕

Embodiments of the power generation control device of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of one embodiment. In this FIG. 1, a generator 1 has an armature winding 2. Three-phase full-wave rectifier 3. It is composed of a field winding 4, and is connected to a battery 17. Current is supplied to the electrical load 18.

The power generation control device 5 is based on the present invention and includes a first switching means 6, a second switching means 12, an initial excitation resistor 11, a transistor 7 as a switching element, a power transformer 9. It is composed of resistors 8, 7, a light wheel diode 10°, and an initial excitation resistor 11, and the second switching means 12 can set the conductivity of the output waveform to an arbitrary value in response to an output limit request signal from the outside. It is. Further, this second switching means 12 is independent from the first switching means 6.

The first switching means 6 has resistors 6a and 6b connected in series between the output end of the three-phase full-wave rectifier 3 and the ground, and a diode 6c at the connection point between the resistors 6a and 6b.
and Zener diode 6dl- are connected to the pace of transistor 7, and the output voltage of generator 1 is detected.

The emitter of the transistor 7 is thus grounded, the collector is connected to the output end of the three-phase full-wave rectifier 3 via the resistor 8, and the Connected to the pace of transistor 9.

The emitter of the nozzle transistor 9 is grounded, and the collector is connected to the output end of the three-phase full-wave rectifier 3 via the field winding 4. A live wheel diode 10 is connected in parallel to the field winding 4.

On the other hand, the second switching means 12 is connected to the conductivity control circuit 1
2d, an output limit request signal A is input. The output of this conductivity control circuit 12d is sent to an oscillator 12c.

The output of the oscillator 12c is connected to the base of the transistor 70 via a resistor 12b and a diode 12a.

Next, the operation of the first embodiment of the invention configured as described above will be explained. Close the key switch 16,
When the generator 1 is driven by an engine (not shown), the key switch 16. F) by resistor 8 through initial excitation resistor 11
71 power transistor 9 becomes conductive, current flows through field winding 4, and power generation begins.

At this time, if the output voltage exceeds the set value, the Zener diode 6d turns on and the first voltage detection circuit
The switching means 6 operates and closes the transistor 7, so the power transistor 9 opens and stops power generation, but since the output voltage decreases, the Zener diode 6d
is turned off, the switching means 6 stops operating, the transistor 7 is opened, and the nower transistor 9 is turned off again.
The second switching means 12 is operated by the output limit request signal A from the outside, and the conductivity control circuit 12d and the oscillator 12c are activated. For example, if the transistor 7 is turned on and off with a conductivity of 6096, the power transistor is simultaneously turned on and off with a conduction of 9440%, and the average current flowing through the field winding 4 is 40% of the normal maximum current.

At this time, when the capacity of the electric load 18 is sufficiently small, the output voltage of the generator 1 becomes high, so the first switching means 6 as a voltage detection circuit operates and further controls the field current, so Constant voltage control is performed at the same predetermined setting value as when the second switching means 12 is not operating.

However, when the capacity of the electrical load 18 is large, the voltage does not rise much, so the first voltage detection circuit is
The switching means 6 does not operate, and the field current is controlled by the second switching means 12, thereby performing constant current control with a limited output current.

Here, the conductivity of the second switching means 12 is 60
I explained the case of %, but 10chi and 20chi.

It goes without saying that the same operation can be performed with other conductivity rates such as 30%, and the field current and output current can have values corresponding to each conductivity rate.

An example of the relationship between the conductivity of the second switching means 12 and the maximum output current is shown in FIG. Second switching means 12
It can be understood from FIG. 2 that if the conductivity of the heavy metal is changed sequentially, the output current will also change accordingly.

The power generation control device of this first embodiment has a means for temporarily lowering the driving torque of the generator 1 and a means for suppressing a temperature rise.
If used as means for limiting the output of the generator 1, the output current can be appropriately limited.

In this first embodiment, the first switching means 6 as a voltage detection circuit and the second switching means 12 share a transistor, but as shown in FIG. The transistor 7a may be provided separately, and the same effect can be obtained.

That is, in this FIG. 3, the second switching means 1
The cand of the second diode 12a is connected not to the pace of the transistor 7, but to the pace of the transistor 7a, the emitter of this transistor 7a is grounded, and the collector is connected to the pace of the nower transistor 9.

By doing this, when the oscillator 12c operates, its output is processed to the pace of the transistor 7n through the resistor 12b and the diode 12m, and this transistor a
is turned on, the power transformer 9 is turned off, the field current is cut off, and the output voltage of the generator 1 is lowered.

Further, in each of the above embodiments, the conductivity control circuit 12d.

Although the oscillator 12a is constructed individually, for example, if an intermittent output with variable conductivity is obtained as the output of the microcomputer, it is possible to use the microcomputer in common as arithmetic means that requires output limitation.

〔Effect of the invention〕

As described above, the present invention has a function of detecting the output voltage of the generator with the first switching means and controlling the output voltage of the generator by intermittent field current accordingly. Since the second switching means is actuated by an output limit request signal from outside independently of the switching means to limit the output current of the generator, the output current of the generator is controlled regardless of the state of the battery or electric load. Output current can be easily and appropriately limited.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the power generation control device of the present invention, FIG. The figure is a circuit diagram of another embodiment of the power generation control device of the present invention. DESCRIPTION OF SYMBOLS 1... Generator, 4... Field winding, 5... Power generation control device, 6...-first switching means, 12... Second switching means, 12c... Oscillator, 12d・
...Conductivity control circuit, 17...Battery, 18...
electrical load. In addition, the same symbols in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A generator that supplies current to the battery and electrical load, and detects the output voltage of this generator and turns on and off a switching element according to the detected value to intermittent the field current of the generator. a first switching means that maintains the output voltage at a set voltage; and a second switching means that has an oscillator that can change the conductivity in response to an external output restriction request independently of the first switching means. A power generation control device comprising means. (2) The power generation control device according to claim 1, wherein the oscillator is capable of successively changing the conductivity.