JPH0447560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Technical Field of the Invention The present invention provides a generator device, in particular a field winding configured to be excited by a voltage obtained by filtering a pulse width modulated voltage component, The above pulse width is given by the sum of the output voltage information corresponding to the output voltage from the main power generation winding and the voltage component corresponding to the voltage directly applied to the field winding. The present invention relates to a generator device in which the pulse width is set to zero when the field current increases undesirably.

(B) Technical Background and Problems Conventionally, generator devices such as engine generator devices have been equipped with a voltage adjustment means as shown in Figure 6, which adjusts the field current supplied to the field winding. to maintain the output voltage from the main power generation winding at a predetermined value.

In FIG. 6, 1 is a main power generation winding, 2 is a field winding, 3 is an excitation power generation winding which serves as a power source for supplying field current, 4 is a voltage adjustment means, 5 is a rectifier circuit, 6 is a smoothing capacitor, 7 is a rectifier circuit for inputting output voltage information, 8 is a capacitor, 9, 10, 1
1, 12, 13 are voltage dividing circuits, 14 is a Zena diode, 15 is a voltage detection transistor, 16 is a Darlington connection transistor, 17 is a diode,
18, 19 and 20 each represent a resistor, and 21 and 22 each represent a capacitor.

The configuration shown in FIG. 6 is a well-known configuration, so to speak.
Voltage information corresponding to the output voltage from the main power generation winding 1 is picked up, rectified, and then applied to voltage dividing circuits 9, 10, 11, 12, and 13. Then, the voltage including the ripple component divided by the circuit is compared with the Zener voltage of the Zener diode 14. When Zena diode 14 is turned on, transistor 15 is turned on and Darlington connected transistor 16 is turned off, turning off the field current. That is, the output voltage from the main power generation winding is dropped. Further, when the Zena diode 14 is turned off, the field current is turned on, contrary to the above, and the output voltage from the main power generation winding is increased. In the above, the field current is obtained by rectifying the voltage from the excitation power generation winding 3 by the rectifier circuit 5, and smoothing the voltage by the smoothing capacitor 6, which is then applied to the field winding 2 and the Darlington connection transistor 16. is supplied by applying it to a series circuit with.

In the case of the conventional configuration as described above, it has been widely adopted, but the problems are as follows: i It is desired that the capacitance of the smoothing capacitor 6 shown in FIG. 6 be sufficiently large. If it does not have a sufficient value, the effect of the ripple included in the voltage rectified by the rectifier circuit 5 will appear as a fluctuation in the field current, and the voltage fluctuation in the output voltage will become large.

The field winding may be rare for some reason.
When shot, the effect appears in the form of a decrease in the output voltage, and control is performed so that the field current is undesirably increased.

It is difficult to control undesirable flicker caused by uneven rotation when the engine is driven.

and so on.

(C) Object and structure of the invention The present invention aims to solve the above problems, and the generator device of the present invention has a main power generation winding 1.
and a field winding 2, and is supplied to the field winding 2 in order to receive output voltage information regarding the output voltage from the main power generation winding 1 and control the output voltage to a predetermined voltage level. In a generator apparatus having a voltage regulating means 4 for controlling a field current, the voltage regulating means 4 has a first input section receiving the output voltage information and a voltage related to the voltage applied to the field winding 2. a current switching section 23 which is switched with a pulse width modulation signal having a pulse width corresponding to the sum of the output voltage information and the voltage component; A filtering section 28 that filters the voltage switched by the switching section 23 is provided, and the output from the filtering section 28 applies the voltage to the field winding 2 and supplies the field current. It is characterized by the fact that This will be explained below with reference to the drawings.

(D) Embodiments of the Invention Fig. 1 shows the configuration of one embodiment of the present invention, Fig. 2 shows the configuration of another embodiment of the invention, and Figs. 3 and 4 explain the operation of the above embodiment configuration. The explanatory diagram, FIG. 5, shows one embodiment of the pulse width modulation signal generation circuit in the configuration of the above embodiment. Further, FIG. 6 shows the conventional configuration as described above.

In FIG. 1, symbols 1, 2, 3, 4, 5,
6 and 17 correspond to FIG. 6, 23 is a pulse width modulation signal generation circuit provided in the present invention, 24 is a switching section, 25 is a transformer, 2
6 is a diode, 27 is a rectifier circuit, 28 is a filter section which in the illustrated case is composed of a capacitor, and 29 is a field current detection resistor. Note that the above structures 23 and 24 correspond to the current switching section according to the present invention.

In the illustrated embodiment, pulse width modulation signal generation circuit 2
3 generates a pulse width modulation signal having a pulse width obtained based on output voltage information corresponding to the output voltage from the main power generation winding 1, as will be described later with reference to FIGS. 3 to 5. Then, the switching section 24 is controlled so that the current flowing through the primary winding of the transformer 25 is turned on and off at a fundamental frequency within a range of, for example, about 10 KHz to 200 KHz. As a result, the output from the excitation power generation winding 3 is rectified by the rectifier circuit 5, smoothed by the capacitor 6, and the current supplied to the primary winding has a period corresponding to the fundamental frequency. It is turned on and off, and an alternating voltage is induced in the secondary winding of the transformer 25. The voltage is rectified by a rectifier circuit 27 and smoothed by a smoothing capacitor 28 having a relatively small capacity (because the frequency is high) to supply a field current to the field winding 2.

At this time, the pulse width modulation signal generation circuit 23
As will be described later, it is proportional to the superimposed value of the output voltage information V _a corresponding to the output voltage output from the main power generation winding 1 and the voltage component V _b corresponding to the output voltage of the illustrated rectifier circuit 27. A pulse width modulated signal S having a small pulse width is generated. Since the switching section 24 is turned on and off by this signal S, the above field current becomes i if the output voltage information V _a corresponding to the output voltage from the main power generation winding 1 increases As a result, the pulse width is reduced, and the field current is controlled to be reduced. Conversely to the above, when the output voltage decreases, the field current increases.

When the voltage component V _b includes a ripple component and reaches a peak of the ripple component, the pulse width is correspondingly decreased and the field current is controlled to decrease. Contrary to the above, when a trough corresponding to the ripple arrives, the field current is increased.

As a result, the output voltage from the main power generation winding 1 is suppressed from voltage fluctuations caused by load fluctuations or uneven rotation of the engine, and the influence of ripples contained in the field current is suppressed. It will be maintained at a predetermined voltage.

As will be described in detail with reference to FIG. 5, the magnitude of the field current is detected by the resistor 29 shown in FIG. And the current component corresponding to the field current
V _c is supplied to the pulse width modulation signal generation circuit 23,
When a rare shot or the like occurs in the field winding 2 and the current component V _c increases undesirably, the pulse width modulation signal S is turned off (state where the pulse width is zero).
Then, the switching section 24 is turned off. That is, the field current is cut off to zero. As a result, the field current does not continue to increase undesirably.

FIG. 2 shows the configuration of another embodiment of the present invention, with reference numerals 1, 2, 3, 4, 5, 6, 17, 23,
24, 28, and 29 correspond to FIG. 1, respectively.
In the case of the configuration shown in FIG. 2, the switching section 24
The only difference from the configuration shown in FIG. 1 is that the field current itself is directly turned on and off, and the substantial operation is substantially the same. However, compared to the configuration shown in FIG. 1, the capacity of the switching section 24 can be made smaller, but the excitation power generation winding 3 and the field winding 2 cannot be insulated from each other.

In the configuration shown in FIG. 2, the switching section 24 may be inserted on the side of point A indicated by the cross mark in the drawing.

Next, the operation and configuration of the pulse width modulation signal generation circuit will be explained. In Fig. 5, reference numeral 2
3, 24, V _a , V _b , V _c correspond to FIG. Also, code 30 is a sawtooth wave (the fundamental frequency is
10KHz to 200KHz range) generation circuit section, 31
32 is a comparison circuit that detects the output voltage information V _a , 32 is a comparison circuit that detects the superimposed value of the above information V _a and voltage component V _b , 33 is a comparison circuit that determines whether the current component V _c is abnormal, and 34 is a comparison circuit for generating a pulse width modulation signal, 35 and 36 are diodes for preventing interference,
37 is a first input section, 38 is a second input section, 39
represents the third input section.

The sawtooth wave generating circuit 30 generates a sawtooth wave having a predetermined period as shown in FIG. 3A. Now, suppose that the signal input to one terminal of the pulse width modulation signal generation comparison circuit 34 has a level signal B as indicated by the dotted line in FIG. 3A.
While the value of the sawtooth wave exceeds the dotted line level, the comparator circuit 34 is turned on, and a signal S whose pulse width is modulated as shown in FIG. 3B is obtained. When a signal C having a fluctuating waveform as shown in FIG. 4A is input in place of the signal B indicated by the dotted line in FIG. 3A, the wave height of the signal C changes as shown in FIG. 4B. The pulse width will vary in a corresponding manner.

The comparison circuit 31 shown in FIG.
An output corresponding to V _a is generated, and the input terminal of the comparison circuit 32 receives the output voltage information V _a
The superimposed value of and the voltage component V _b is input. Therefore, the output of the comparison circuit 32 corresponds to the value (Va+Vb), so to speak. This output is then input to one terminal of the comparison circuit 34 for generating a pulse width modulation signal. As a result, control is performed to suppress fluctuations in the value (Va+Vb).

Further, the above-mentioned current component V _c is input to the comparison circuit 33 shown in FIG. 5, and when the current component V _c undesirably increases to a predetermined level or more, Generates a high level signal that is even greater than the high value. As a result, when the high level signal is generated, the pulse width modulation signal generation comparison circuit 34 is forcibly turned off regardless of the value (V _a +V _b ). That is, it functions to turn off the transistor of the switching section 24 and stop the supply of field current.

Note that the fluctuation period of the output voltage information V _a itself has a sufficiently large period compared to the frequency of the output voltage, for example, 50 Hz, unless the influence of the engine rotational unevenness mentioned above is taken into consideration. Even considering the effects, it has a frequency of several hundred Hz or less at most. Further, the known fluctuation of the voltage component V _b is, for example, about 100 Hz. Therefore,
These are sufficiently large compared to the repetition period of the pulse width modulation signal S, and the output voltage information V _a
This makes it possible to suppress fluctuations in voltage component Vb and fluctuations in voltage component Vb.

(E) Effects of the Invention As explained above, according to the present invention, since the repetition frequency of the pulse width modulation signal S is sufficiently high, not only fluctuations in the output voltage due to fluctuations in load but also fluctuations in the engine Fluctuations due to uneven rotation of
It is also possible to perform control to suppress fluctuations caused by ripples in the voltage applied to the field winding. It is also possible to interrupt the field current when the field current increases undesirably.

[Brief explanation of drawings]

FIG. 1 shows the configuration of one embodiment of the present invention, FIG. 2 shows the configuration of another embodiment of the present invention, FIGS. 3 and 4 are explanatory diagrams explaining the operation of the above embodiment configuration, and FIG. An embodiment of the pulse width modulation signal generation circuit having the configuration of the embodiment described above will be shown. Further, FIG. 6 shows a conventional configuration. In the figure, 1 is a main power generation winding, 2 is a field winding, 3 is an excitation power generation winding, 4 is a voltage adjustment means, 23 is a pulse width modulation signal generation circuit, 24 is a switching section, 28
is the filter section, V _a is the output voltage information, V _b is the voltage component,
V _c represents a current component, and S represents a pulse width modulation signal.

Claims (1)

[Scope of Claims] 1. A main generating winding 1 and a field winding 2, and receiving output voltage information regarding the output voltage from the main generating winding 1 to adjust the output voltage to a predetermined voltage level. In a generator device comprising a voltage regulating means 4 for controlling a field current supplied to the field winding 2 to be controlled, the voltage regulating means 4 comprises a first input section for receiving the output voltage information and a first input section for receiving the output voltage information; a second input section that receives a voltage component related to the voltage applied to the field winding 2, and a pulse width modulation signal having a pulse width corresponding to the sum of the output voltage information and the voltage component. A current switching section 23 that is switched by the current switching section 23 and a filtering section 28 that filters the voltage switched by the current switching section 23 are provided. A generator device characterized by applying a voltage and supplying the field current. 2 has a main power generation winding 1 and a field winding 2, and receives output voltage information regarding the output voltage from the main power generation winding 1 and controls the output voltage to a predetermined voltage level. In a generator device having a voltage regulating means for controlling a field current supplied to the winding 2, the voltage regulating means 4 applies the voltage to a first input section that receives the output voltage information and the field current to the field winding 2. a second input receiving a voltage component relating to the voltage applied to the field current 3; and a third input receiving a current component corresponding to the field current 3.
when the field current increases to a predetermined level or above; A current switching section 23 that turns off the pulse width modulation signal and a filtering section 28 that filters the voltage switched by the current switching section 23 are provided, and the output from the filtering section 28 is connected to the field winding. A generator device characterized in that the above-mentioned voltage is applied to the line 2 and the above-mentioned field current is supplied.