JPS62147960A - Power generator driven by internal-combustion engine - Google Patents

Abstract

PURPOSE:To make it possible to maintain a DC voltage level to a predetermined value easily by adopting the constitution of generator with the combination of an internal-combustion engine driving and generating set, a rectifying circuit and an inverter circuit. CONSTITUTION:In coping with the fluctuation of rotation of an internal-combustion engine, a generator 1 driven by the internal-combustion engine generates an AC voltage in which a frequency and the voltage change respectively. This AC voltage is converted into a DC voltage by a rectification circuit 2, and after it is kept to a predetermined DC voltage level by a chopper type switching regulator 3, it is converted into the AC voltage having a predetermined frequency and a specified level by an inverter circuit 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to an internal combustion engine-driven power generator, in particular, converts the output from an alternator driven by the internal combustion engine into direct current, and then converts it to a predetermined frequency using an inverter circuit. In an internal combustion engine-driven power generation device that converts an alternating current voltage into an alternating current voltage, a chopper-type switching regulator is used to control the direct current output to a predetermined direct current voltage level under the above-mentioned state of converting the direct current to a direct current voltage.

The present invention relates to an internal combustion engine-driven power generator that absorbs voltage fluctuations of the alternator.

[Conventional technology]

Conventionally, in internal combustion engine-driven power generators, it has been attempted to prevent the frequency of the alternating current output from the generator from fluctuating due to fluctuations in the rotational speed of the internal combustion engine, and to obtain a large output with a relatively small generator. In order to do so, should I once correct the output of the above generator? Yoko-Nari is used to convert the voltage into an AC voltage of a predetermined frequency after performing A/M conversion.

However, even in this configuration, when a permanent magnet field generator is used, the problem is how to suppress fluctuations in the output voltage of the generator caused by fluctuations in the rotational speed of the internal combustion engine. In order to suppress fluctuations in the output voltage of the generator, for example, the ignition timing of the internal combustion engine is changed by means such as misfire delay, and the rotational speed of the internal combustion engine is changed.

[Problem that the invention seeks to solve]

Conventionally, the above-mentioned configuration has been employed to obtain an alternating current voltage having a predetermined frequency and a predetermined voltage.

However, in the case of a configuration in which the rotational speed of the internal combustion engine is controlled in order to suppress fluctuations in the output voltage as described above, the delay time constant existing in the control loop is large, making it difficult to configure the control system.

In addition, within the range of obtaining an AC voltage of a predetermined voltage at the above-mentioned predetermined frequency,
! ? ! In the case of an engine-driven generator, an AC voltage of 100 (V') is obtained in the apparatus used in Japan, but an AC voltage of 230 (V') is obtained in the apparatus used in foreign countries.
It is necessary to obtain an AC voltage of (V), and in order to deal with the above problem, it cannot be solved by adjusting the rotation speed of the above-mentioned internal combustion engine, so two types of generators are prepared. It is necessary to select a generator depending on whether it is for a foreign country or a foreign country.

[Means for solving problems]

The present invention is intended to solve the above problems.

While adopting the configuration of the power generating device having the above-described combination of the internal combustion engine-driven power generating device, the rectifier circuit, and the inverter circuit, a chopper type switching regulator is used in the DC output stage.

Then, if necessary, the chopper-type switching regulator itself can be selectively replaced, or the operating mode of the regulator can be selectively switched, thereby creating a single generator for use in Japan and overseas. I am trying to deal with it by using it.

FIG. 1 shows a basic configuration diagram of the present invention, where ◯ represents an internal combustion engine driven generator, 2 represents a rectifier circuit, 3 represents a chopper type switching regulator used in the present invention, and 4 represents an inverter circuit.

As the internal combustion engine driven generator 1, a generator with a permanent magnet field is used. The generated alternating current voltage is then converted into direct current voltage by the rectifier circuit 2. The chopper type switching regulator 3 includes a pulse width modulator that modulates the pulse width in accordance with the voltage level of the DC voltage on the output side of the regulator 3, and a switching element that is turned on and off by the modulator. Then, the voltage level of the DC voltage on the output side of the regulator 3 is maintained constant. The inverter circuit 4 converts the DC voltage maintained at a constant voltage level into an AC voltage having a predetermined frequency.

[Effect]

A generator 1 driven by an internal combustion engine generates an alternating current voltage whose frequency and voltage change in response to changes in the rotational speed of the internal combustion engine. The AC voltage is converted into DC by the rectifier circuit 2. The voltage is maintained at a constant DC voltage level by the chopper switching regulator 3, and then converted by the inverter circuit 4 into an AC voltage having a predetermined frequency and a predetermined voltage level.

In the above configuration, 1゜O〔■〕 for use in Japan
It was designed to obtain an alternating current voltage of 23
When trying to obtain an AC voltage of 0 (V), the following is done. That is, as a chopper type switching regulator 3.

There are two types: a step-down type and a step-up type, but if you need both of the above 230 (V), use a step-up type to boost the DC voltage level (for example, 150 CV) and then connect it to the inverter circuit. 4, and the above 100
(V), a step-down type is used to step down the DC voltage level of about 150 [V] and then supply it to the inverter circuit 4.

In addition to the above, 1. For example, after converting the output of a generator that generates a voltage of about 90 CV (at no load) into a DC voltage,
A boost type regulator that boosts the voltage to the level of 230 [V] and a boost type regulator that boosts the voltage to the level of IOMV) may be used. Furthermore, 5. For example, after converting the output of a generator that generates a voltage of about 240 (V) in DC conversion when outputting the rated power to DC voltage, 2.
A step-down regulator that steps down the voltage to a level of 30 [■] and a step-down regulator that steps down the voltage to a level of 100 (V) may be used.

〔Example〕

FIG. 2 shows the configuration of an embodiment of the present invention using a step-up regulator. Reference numerals 1, 2.4 in the figure correspond to those in FIG. 1, 3-U is a step-up regulator, 5 is a pulse width modulator, 6 is a switching element, 7 is an inductance element, and 8 is a diode.

9 represents a capacitor.

Figure 3 shows the case of obtaining an AC voltage of 230 (V) and the case of obtaining an AC voltage of 100 [V].
An explanatory diagram illustrating a case in which an AC voltage of V) is obtained is shown. For example, if the generator 1 shown in FIG. 2 has the characteristics shown in FIG. A regulator that obtains the characteristics shown in the illustrated characteristic (B) is used. In addition, in a device that obtains an output of 230 (V'l), a regulator that obtains the characteristics shown in FIG. 3 (C) is used as the step-up regulator 3-U. It may be used selectively, or one designed to switch the operation mode may be used.The dotted line (D) shown in FIG. represents.

FIG. 4 is an explanatory diagram illustrating a case where a combination of a step-down type regulator and a step-up type regulator is used. Characteristics (A), (B), (C) in the figure.

(D) correspond to those shown in FIG. 3, respectively.

When using a step-up regulator that obtains the characteristic (C) shown in FIG. 4, a configuration similar to that shown in FIG. 2 is used. On the other hand, when using a step-down regulator that obtains the characteristic (B) shown in FIG. 4, the configuration shown in FIG. 5 is used. Fifth
Reference numerals 1 and 2°4 in the figure correspond to those in FIG. 1, 3-D is a step-down regulator, 5 is a pulse width modulator, and 6 is a switching element.

7 represents an inductance element, 8 represents a diode, and 9° and 10 represent a capacitor.

FIG. 6 shows an explanatory diagram illustrating a case where a combination of step-down regulators is used. Characteristics (A) and (B) in the diagram
, (C) and (D) correspond to those shown in FIG. In the case of characteristic (B) and characteristic (C) shown in Figure 6,
), the configuration shown in FIG. 5 is used. In this case, regulators designed separately may be selectively used, or regulators designed to be able to switch operation modes may be used.

In the above, a power generation device using a chopper type switching regulator was shown, but PNP l is used as a power control transistor in the regulator or inverter.
-Using transistors provides a simple circuit configuration. FIG. 7 shows a circuit configuration corresponding to FIG. 5 described above in this case. The symbols in the figure are the same as in FIG. 5.

However, the control current is 3 to IOA and the withstand voltage is 4
There are few 00 to 600V PNP l-transistors on the market, and custom products are disadvantageous in terms of cost. For this purpose, it is considered to use an NPN transistor instead of the PNP l-transistor, but in this case a circuit for supplying the base current is required. FIG. 8 shows a circuit configuration corresponding to FIG. 5 in this case. In FIG. 8, NPNI transistors are used for both the regulator L-D and the inverter circuit 4.

For this reason, three systems of control power supplies that are electrically independent from each other are required.

In order to solve the above problem, in FIG. 9, which corresponds to one embodiment of the present invention, as a power control transistor,
A PNPI-transistor and an NPN l-transistor were combined in a Darlington configuration. So to speak (PNP+NPN)
) A transistor is used. FIG. 9 shows a circuit configuration corresponding to FIG. 5, as in the case of FIGS. 7 and 8.

It is substantially the same as that shown in FIG. 7, and the difficulties of the case shown in FIG. 7 are solved.

〔Effect of the invention〕

As explained above, according to one aspect of the present invention, a chopper type switching regulator is used to maintain the DC voltage level at a predetermined value. For this reason, control to maintain the voltage level at a predetermined value is relatively easy, and even when obtaining a power generation device with different output voltage levels, it is possible to use the same alternator itself.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention using a step-up regulator. 3, 4, and 6 are explanatory diagrams, respectively, and FIG. 5 shows the configuration of an embodiment of the present invention using a step-down regulator. Further, FIGS. 7 and 8 are explanatory diagrams for explaining the present invention in detail, and FIG. 9 shows another embodiment of the present invention. In the figure, ■ is an internal combustion engine-driven generator, and 2 is a rectifier circuit. 3 is a chopper type switching regulator, 3-U is a step-up type regulator, 3-D is a step-down type regulator, 4
5 represents an inverter circuit, 5 represents a pulse width modulator, 6 represents a switching element, 7 represents an inductance element, and 9 represents a capacitor.

Claims (1)

[Scope of Claims] An alternator driven by an internal combustion engine, a rectifier circuit that rectifies the output of the alternator, and a constant voltage control circuit that maintains the DC output from the rectifier circuit at a predetermined DC voltage level. and an inverter circuit that converts a DC voltage maintained at a predetermined DC voltage level by the constant voltage control circuit into an AC voltage having a predetermined frequency, wherein the constant voltage control circuit Consisting of a chopper-type switching regulator that has a pulse width modulator that modulates the pulse width in response to the output side voltage of the constant voltage control circuit, and has a switching element that is turned on and off by the pulse width modulator. An internal combustion engine-driven power generation device characterized by: