JP3073983B1 - Portable generator and method of adjusting output of portable generator - Google Patents

Abstract

A portable generator that generates power by adjusting the number of revolutions of an engine in accordance with a change in load may not be able to follow an increase in the output of the generator when the load increases rapidly.
In some cases, the engine stopped working. SOLUTION: An AC voltage generated by operating an AC generator (50) is once converted to DC by a DC voltage generation circuit (110), and then a single-phase AC voltage is formed by an inverter circuit (130). In a portable generator (100) that outputs a phase AC voltage from output terminals (151, 152), a DC voltage generation circuit (11
The throttle opening of the engine is controlled so that the operating ratio of (0) is predetermined, and when the operating ratio of the DC voltage generating circuit (110) is substantially the maximum operating ratio and the throttle is almost fully opened, or the throttle opening is When the engine speed is lower than a predetermined value near the full open state, the output voltage of the inverter circuit (130) is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable generator for outputting an AC voltage such as 100 volts by rotating a generator by an engine.

[0002]

2. Description of the Related Art Today, small generators that can be moved to a required place using a gasoline engine or a diesel engine and that can produce an output of several kilowatts have been frequently used. Have been. A portable generator capable of this movement outputs a single-phase AC voltage of 50 Hz or 60 Hz by setting the average output voltage to about 100 volts and the engine speed to a constant speed. There was a generator.

However, recently, there is a type in which an output voltage of an AC generator rotated by an engine is once converted into a DC voltage, and an inverter is used to form an output voltage having a constant frequency of 50 Hz or 60 Hz ( For example,
JP-A-63-114527, JP-A-63-30272
No. 4). In addition, a small portable generator that can output about several kilowatts to about ten kilowatts using an engine is not limited to a case where it is brought into a place of use and is always movable so as to perform a power generation operation. In some cases, such as when the usage period in a place continues, it may be fixedly installed and operated.

In a portable generator employing this inverter, as shown in FIG. 8, an AC generator 50 rotated by an engine, a rectifier diode 115 and a thyristor 111 are used.
A DC voltage generating circuit 110 using a DC power supply section 12 and a large-capacity capacitor 121 having a required number of capacitors in parallel.
0, and an inverter circuit 130 using a power transistor
And a low-pass filter 140. Further, as a control circuit for driving and controlling the power circuits such as the DC voltage generation circuit 110 and the inverter circuit 130, a PWM signal generation circuit
250, a voltage limiting circuit 240, an overload detection circuit 260, an inverter drive circuit 255, and the like. Further, the portable generator 100 also includes a smoothing circuit 210 and a constant voltage circuit 235 as a power supply unit for driving these control circuits.

As an AC generator 50 for rotating a rotor by this engine, a generator having a three-phase output winding 51 and a single-phase output winding 55 is often used. The three-phase output winding 51 has a maximum output of several hundred volts and can output about several tens of amps, and the single-phase output winding 55 has several tens of volts and can output about tens of amps. Many. The DC voltage generation circuit 110 to which the output terminal of the three-phase output winding 51 is connected,
A rectifying bridge circuit using three rectifying diodes 115 and three thyristors 111 is connected. Both output terminals of the rectifying bridge circuit are connected to both ends of a main smoothing capacitor 121 serving as a DC power supply unit 120, and a capacitor is connected. It charges the 121.

The gate terminal of each thyristor 111 in the DC voltage generating circuit 110 is connected to a voltage limiting circuit 240,
By controlling the conduction angle of each thyristor 111, the voltage across the main smoothing capacitor 121 serving as the DC power supply unit 120 is adjusted. The inverter circuit 130 is configured by a bridge circuit using four power transistors. In the inverter circuit 130, the first transistor 131
And the third transistor 133 are connected in series to the DC power supply unit 120, and the second transistor 132 and the fourth transistor 134 are connected in series to the DC power supply unit 120. Also, the first
A middle point between the transistor 131 and the third transistor 133 is connected to a first output terminal 151 via a low-pass filter 140, and a middle point between the second transistor 132 and the fourth transistor 134 is connected to a second output terminal via a low-pass filter 140. Connected to terminal 152. Further, the base of the first transistor 131 and the base of the fourth transistor 134 are connected in common to the inverter drive circuit 255, and the base of the second transistor 132 and the base of the third transistor 133 are connected in common to the inverter drive circuit 255. are doing.

[0007] The inverter drive circuit 255
The first PWM signal output to the transistor 131 and the fourth transistor 134 and the second PWM signal output to the second transistor 132 and the third transistor 133 are high-frequency pulse signals of several kilohertz or more. The pulse width is sequentially changed in a cycle of 50 Hz or 60 Hz, and the amount of change in the pulse width is a signal that is sequentially increased or decreased in a sinusoidal manner.

The first PWM signal and the second PWM signal have opposite phases. For this reason, when the first transistor 131 and the fourth transistor 134 are made conductive by the first PWM signal to set the midpoint between the first transistor 131 and the third transistor 133 to the voltage VD of the DC power supply unit 120, the second transistor 132 The midpoint of the second transistor 132 and the fourth transistor 134 is set to 0 volt, and the second PWM signal is
When the third transistor 133 and the third transistor 133 are turned on, the midpoint between the first transistor 131 and the third transistor 133 is set to 0 volt, and the midpoint between the second transistor 132 and the fourth transistor 134 is set to the voltage VD of the DC power supply unit 120. It is said.

As shown in FIG. 9A, the midpoint potential of the first transistor 131 and the third transistor 133 switches between 0 volts and the voltage VD of the DC power supply 120 at a high speed, and the DC power supply voltage The duration of VD changes sequentially. or,
As shown in FIG. 9B, the midpoint potential between the second transistor 132 and the fourth transistor 134 also switches between the voltage VD of the DC power supply 120 and 0 volts at a high speed, and the duration of the DC power supply voltage VD sequentially increases. Change.

For this reason, the first output voltage and the second output voltage that have passed through the low-pass filter 140 are, as shown in FIG.
A sine wave voltage of 50 Hz or 60 Hz, and
The voltage of the first output terminal 151 and the voltage of the second output terminal 152 are
50 Hz or 60 with maximum and minimum values shifted by half a cycle
It is formed as a hertz AC output voltage. The single-phase output winding 55 of the AC generator 50 is connected to a smoothing circuit 210 in the control power supply circuit, as shown in FIG.

The smoothing circuit 210 includes a rectifying diode 211
And a smoothing capacitor 215, a rectifier diode 211 is inserted between the output terminal of the single-phase output winding 55 and the smoothing capacitor 215, and the output voltage of the single-phase output winding 55 causes the smoothing capacitor 215 to be connected. The battery is charged to form a DC voltage. The number of rectifying diodes 211 is not limited to one as shown in FIG. 8, but a smoothing capacitor may be charged as a full-wave rectifying bridge using four rectifying diodes.

An output terminal of the smoothing circuit 210 is connected to a constant voltage circuit 235, and the constant voltage circuit 235 forms a predetermined voltage for driving a control circuit. Further, the constant voltage circuit 235 connects the negative terminal to the positive terminal of the DC power supply unit 120,
The positive terminal of the constant voltage circuit 235 is connected to the voltage limiting circuit 240, the PWM signal generating circuit 250, and the inverter drive circuit 240.

The voltage limiting circuit 240 is constituted by using a resistor and a comparator, and includes a first reference voltage resistor 245 and a second reference voltage resistor 246 in series with a positive terminal of the constant voltage circuit 235. Between the first reference voltage resistor 245 and the second reference voltage resistor 246 to the reference input terminal of the comparator 243. . Also, the first
The voltage dividing resistor 248 and the second voltage dividing resistor 249 are connected in series between the positive terminal of the constant voltage circuit 235 and the negative terminal of the DC power supply unit 120, and the first voltage dividing resistor 248 and the second voltage dividing resistor 249 are connected in series. The midpoint of the two-divided resistor 249 is connected to the comparison input terminal of the comparator 243.

Further, the output terminal of the comparator 243 is connected to the + terminal of the constant voltage circuit 235 via the control resistor 241 and also to the gate terminal of each thyristor 111 in the DC voltage generation circuit 110. ing. When the output terminal of the comparator 243 is connected to the gate terminal of each thyristor 111, it is connected via the protection resistor 117. Therefore, in the voltage limiting circuit 240, the constant voltage circuit 2 of the control power supply circuit is used.
The constant voltage formed at 35 is divided by the first reference voltage resistor 245 and the second reference voltage resistor 246 to form a constant reference voltage, and the constant voltage reference voltage is compared. Input to the reference input terminal of the detector 243.

Further, a voltage obtained by adding the output voltage of the DC power supply unit 120 and the constant voltage formed by the constant voltage circuit 235 is divided by the first voltage dividing resistor 248 and the second voltage dividing resistor 249, and the detection voltage is obtained. And the detection voltage can be input to the comparison input terminal of the comparator 243. Therefore, the detection voltage input to the comparison input terminal fluctuates due to the voltage fluctuation of the DC power supply unit 120, and this detection voltage is connected to the first reference voltage resistor 245 and the second reference voltage resistor 245.
When the voltage is lower than the reference voltage formed by the reference voltage resistor 246, the output of the comparator 243 is set to a positive potential.

Accordingly, the gate potential of the thyristor 111 can be made higher than the cathode potential of the thyristor 111, and a gate current is supplied to each thyristor 111 via the control resistor 241 to make each thyristor 111 conductive. Will be. Therefore, when the output voltage of the three-phase output winding 51 becomes higher than the voltage of the DC power supply unit 120, power is supplied to the DC power supply unit 120, and the voltage of the DC power supply unit 120 is increased.

When the voltage of the DC power supply 120 rises and the detection voltage input to the comparator 243 becomes equal to the reference voltage, the output of the comparator 243 becomes 0, and the gate potential of each thyristor 111 becomes the cathode potential. Equal, each thyristor 11
1 becomes non-conductive. As described above, the voltage limiting circuit 240 performs charging from the AC generator 50 when the voltage formed by the DC power supply unit 120 becomes lower than a certain voltage, and stops charging when the voltage reaches the certain voltage. Can be constantly maintained at a constant voltage VD set by the voltage limiting circuit 240 at about 170 volts to 200 volts.

Then, the potentials of the first output terminal 151 and the second output terminal 152 are changed at a constant cycle of 50 Hz or 60 Hz by the inverter circuit 130, and the first output terminal 151 is changed.
The maximum potential difference between the voltage of the second output terminal 152 and the voltage of
A single-phase AC voltage having an average voltage of 100 volts is output by applying 41 volts. A PWM signal generation circuit 250 that forms a PWM control signal for controlling the inverter circuit 130 includes:
A PWM control signal is formed from a reference sine wave such as 50 Hz or 60 Hz and a high frequency triangular wave, and is output to the inverter drive circuit 255.

The reference sine wave of the PWM signal generation circuit 250 is the frequency of the voltage output from the output terminal.
It is formed in accordance with a predetermined frequency such as Hertz or 60 Hertz, adjusts the ratio between the reference sine wave voltage and the triangular wave voltage, and outputs the output voltage VD of the DC The frequency of the pulse signal used as the PWM control signal, the pulse width, and the amount of change in the pulse width are determined by the characteristics of the circuit 130 and the low-pass filter 140.

Further, in this portable generator 100, a detection resistor 261 is provided between the DC power supply section 120 and the inverter circuit 130.
Is provided. The overload detection circuit 260 includes a detection resistor 261 and an arithmetic circuit unit 265, and when a current value exceeding a rated current value is detected, a stop signal is added in consideration of time according to a magnitude exceeding the rating. This is output to the inverter drive circuit 255.

The arithmetic circuit unit 265 uses various circuits using a comparator, a capacitor, and a resistor. In many cases, the arithmetic circuit unit 265 takes twice the rated current in consideration of the characteristics of the elements constituting the power circuit. When the current flows through the inverter drive circuit 255, the stop signal is immediately output and the first stop signal is output from the inverter drive circuit 255.
The output of the PWM signal and the second PWM signal is stopped.
When a current slightly exceeding the rated current is detected, a stop signal is output to the inverter drive circuit 255 when a time of several seconds to several minutes has been maintained.

As described above, the portable generator 100 which once rectifies the three-phase AC by the DC voltage generation circuit 110 and converts the DC voltage generated by the DC power supply unit 120 to the AC voltage again by the inverter circuit 130 is an AC generator By changing the number of revolutions of 50, that is, the number of revolutions of the engine, it is possible to always generate electric power according to the load, and to form an AC output voltage with a constant frequency and voltage that is constantly stabilized.

Accordingly, the engine speed is adjusted in accordance with the load fluctuation, the engine speed is increased in the case of a high load, the engine speed is lowered in the case of a low load, and the required energy is adjusted according to the load. Since it is sufficient if the power is generated from the engine, the output can be easily adjusted according to the load, and the portable generator 100 can be made efficient. When the overload state exceeds the rated output, the operation of the inverter circuit 130 is stopped instantaneously or in accordance with the elapse of a predetermined time according to the overload state, and the output voltage is set to 0 to secure the entire circuit. It is possible to operate various electrical devices loaded within a range of several kilowatts, which is a rated output, while maintaining the rated output.

As described above, the portable generator 100 with an engine using the inverter circuit 130 has the same function as the commercial power supply.
Since it can output 00-volt single-phase AC power, it has recently been used as a power source for various general electric devices. Some of such portable generators 100 are capable of adjusting the output voltage value or the voltage phase of single-phase AC power and performing parallel operation.

In the portable generator 100 capable of adjusting the output voltage value and the voltage phase, the AC output voltage and the AC output voltage output from the first output terminal 151 and the second output terminal 152 of the portable generator 100 are provided. Detect the current, for example, the output voltage and phase of another generator that performs parallel operation and the portable generator 100
Controls the PWM signal generation circuit 250 so as to always output an output voltage that matches the voltage value and phase of the single-phase AC power output from the power supply (see, for example, Japanese Unexamined Patent Application Publication No.
-49174, JP-A-5-236658, JP-A-5-236658
-244726).

The adjustment of the voltage value is performed not only in the case of performing the parallel operation but also in the case of performing the independent operation in order to prevent the voltage fluctuation due to the type and magnitude of the load connected to the output terminal. (See, for example,
No. 211777). With these portable generators 100,
In many cases, as shown in FIG.
0, an output voltage detection circuit 340 is inserted between the first output terminal 151 and the second output terminal 152 in the subsequent stage.
An output current detection circuit 330 is inserted after 40 to detect the voltage and current of the single-phase AC output output from the first output terminal 151 and the second output terminal 152, and control the PWM signal generation circuit 250.

In this portable generator 100, the single-phase output winding 55 of the AC generator 50 is composed of a smoothing circuit 210 and a constant voltage circuit 235, similarly to the portable generator 100 shown in FIG. Connected to the control power supply unit 201, the output voltage of the single-phase output winding 55 is smoothed by a smoothing circuit 210, and a constant voltage circuit 235 forms a predetermined control voltage Vcc. However, according to the elements constituting the control circuit, the control voltage is + Vcc voltage and -V
The cc voltage may be formed by the control power supply unit 201 in some cases.

The output terminal of the three-phase output winding 51 is connected to a DC voltage generating circuit 110 which is a rectifier bridge circuit using a thyristor and a rectifier diode, and rectifies the output voltage of the three-phase output winding 51. A DC voltage is formed by charging a large-capacity capacitor serving as the DC power supply unit 120, and this DC voltage is input to the inverter circuit 130 to form a single-phase AC voltage, similarly to the above-described prior art.

The PWM signal generating circuit 250 includes a sine wave generating circuit 270 for forming a reference sine wave, a triangular wave generating circuit 281 and a PWM control signal generating circuit 285 for forming a PWM control signal. The wave generation circuit 270 forms an accurate 50 Hz or 60 Hz reference sine wave,
The triangular wave generating circuit 281 forms a high frequency triangular wave of about several kilohertz to several tens of kilohertz, and the PWM control signal generating circuit 285 combines a reference sine wave and a triangular wave to form a pulse train whose pulse width changes sequentially. It forms a signal.

Further, the sine wave generation circuit 270 outputs an oscillation circuit 271 for outputting a high frequency signal of several megahertz to several tens of megahertz, and a clock signal of about 10 kilohertz by dividing the high frequency signal output by the oscillation circuit 271. The dividing circuit 273 forms a number of different potentials by means of a multi-stage voltage dividing resistor, and sequentially selects different potentials by a multiplexer operated by a clock signal to form a stepped sine wave of 50 Hz or 60 Hz. Pseudo sine wave forming circuit
275, and a voltage adjusting circuit 277 for adjusting the peak voltage of the stepped sine wave output from the pseudo sine wave forming circuit 275, and a low-pass filter for forming a smooth sine wave from the stepped sine wave
279.

The voltage detection signal output from the output voltage detection circuit 340 is input to a rectangular wave forming circuit 291 to form a rectangular wave signal having a zero cross point of the AC output voltage as a rising edge and a falling edge, The zero-cross signal converted into the rectangular wave signal is input to the start timing circuit 293 and the phase comparison circuit 297. The start timing circuit 293 releases the pseudo sine wave forming circuit 275 in the sine wave generating circuit 270 so that the pseudo sine wave forming circuit 275 outputs a pseudo sine wave.

Then, when the pseudo sine wave forming circuit 275 is in a reset state and the reference sine wave is not output from the sine wave generating circuit 270, that is, when the inverter circuit 130 is not operating, the output voltage detecting circuit 340 is set to the first state. If a voltage change between the output terminal 151 and the second output terminal 152 is detected, the start timing circuit 293 releases the reset of the pseudo sine wave forming circuit 275 in accordance with the zero cross signal from the rectangular wave forming circuit 291 and generates a sine wave. The phase of the reference sine wave output from the circuit 270 matches the phase of the voltage generated between the first output terminal 151 and the second output terminal 152.

When starting the operation of the pseudo sine wave forming circuit 275, the pseudo sine wave forming circuit 275 may be operated even when the zero cross signal is not input to the start timing circuit 293 within a predetermined time.
And the output of the reference sine wave from the sine wave generation circuit 270 is started. Then, the output current detection circuit 330
Is input to a rectangular wave forming circuit 295, an overload detecting circuit 269, and a limit value detecting circuit 299, and the rectangular wave forming circuit 295 detects a zero-cross signal in accordance with the phase of the output current to detect an overload. The circuit 269 generates a stop signal when the rated current is exceeded, and the limit value detection circuit 299 generates a voltage adjustment signal when the current value is equal to or less than the rated current and exceeds a predetermined lower limit value and upper limit value range. And

The rectangular wave forming circuit 295 forms a rectangular wave signal having the zero cross point of the AC output current as a rising edge and a falling edge based on the current detection signal output from the output current detection circuit 330. The wave signal is input to the phase comparison circuit 297 as a zero-cross signal. This phase comparison circuit 297 compares the phase of the output current with the phase of the output voltage based on the zero-cross signal based on the current detection signal and the zero-cross signal based on the voltage detection signal, and determines whether the current phase is later than the voltage phase. Outputs the added signal as a phase adjustment signal to the frequency divider 273, and
If the current phase is more advanced than the voltage phase, the subtraction signal is output to the frequency divider 273 as a phase adjustment signal.

The frequency dividing circuit 273 in the sine wave generating circuit 270 receives the added signal from the phase comparing circuit 297 when dividing the high frequency signal to form a clock signal of several kilohertz to tens of kilohertz. One pulse is added for every several hundred pulses of the clock signal. When a subtraction signal is input from the phase comparison circuit 297, a clock signal is formed by thinning out one pulse every several hundred pulses of the clock signal.

As described above, when the current phase lags behind the voltage phase, the pulse of the clock signal is increased to slightly advance the phase of the pseudo sine wave and thus the reference sine wave, and the current phase advances beyond the voltage phase. In this case, the phase of the reference sine wave is slightly delayed by thinning out the pulse of the clock signal, and the phase of the PWM control signal is adjusted to reduce the phase of the PWM control signal.
100 adjusts the phase of the single-phase AC voltage output.

The overload detection circuit 269, to which the current detection signal output from the output current detection circuit 330 is input, is based on the current detection signal output from the output current detection circuit 330. The stop signal is output immediately, and when the rated current is slightly exceeded, time integration is performed and the stop signal is output after the required time. And
This stop signal is input to the voltage control circuit 240 and the inverter drive circuit 255, shuts off the gate current output from the voltage control circuit 240 to stop the operation of the DC voltage generation circuit 110, and outputs the signal from the inverter drive circuit 255. The output of the first PWM signal and the second PWM signal is stopped to stop the operation of the inverter circuit 130.

Further, a limit value detection circuit 299 to which a current detection signal output from the output current detection circuit 330 is input is a circuit in which a current upper limit value and a current lower limit value are set.
When the current value of the current detection signal becomes equal to or less than the current lower limit value, the peak value (amplitude) of the reference sine wave is reduced or increased so that the output voltage which is the voltage between the first output terminal 151 and the second output terminal 152 is slightly increased. Voltage adjustment circuit to increase the voltage adjustment signal
Output to 277. When the current value of the current detection signal exceeds the current upper limit value, the first output terminal 151 and the second output terminal 1
A voltage adjustment signal for increasing or decreasing the peak value of the reference sine wave so as to slightly reduce the output voltage which is a voltage between 52 is output to the voltage adjustment circuit 277.

As described above, since the current upper limit value and the current lower limit value are set within the range of the rated current and the output voltage can be finely adjusted, the load sharing can be performed while the generators are operated in parallel. When the current is small, the output voltage is slightly increased to increase the output current, and when the supply current to the load is close to the limit of the rated current, the output voltage is slightly decreased to reduce the output voltage to each portable generator 100. The load is effectively shared.

When the parallel operation is not performed, that is, when the portable generator 100 is used alone by the independent operation,
Since the output voltage fluctuates according to the capacity and type of the load, the amplification factor of the voltage adjustment circuit 277 or the voltage of the triangular wave output from the triangular wave generation circuit 281 is adjusted based on the peak voltage detected by the output voltage detection circuit 340, and the output is adjusted. In some cases, the voltage value of a single-phase AC voltage, which is a voltage, is stabilized.

[0041]

As described above, a portable generator that generates electric power by adjusting the number of revolutions of an engine in accordance with a change in load can perform an operation for efficient electric power generation. . However, when the load suddenly increases, an increase in the engine speed, that is, an increase in the output of the generator may not be able to follow up. In an extreme case, the engine may be stopped.

In parallel operation, there is a case where a slight difference occurs in the performance of the portable generator. Electric power from another generator flows into a specific portable generator, and the parallel operation is performed. There is a drawback that the output of each of the running generators cannot be efficiently supplied to the load. The present invention eliminates such adverse effects and disadvantages, and provides a method for more efficiently controlling the operation of a portable generator and a portable generator employing this control.

[0043]

According to the present invention, an AC generator (50) is operated by an engine to generate an AC voltage, and the AC voltage is converted to a DC voltage generating circuit (11).
0) to form a DC voltage of a predetermined voltage once, and then form a single-phase AC voltage having a predetermined frequency and a constant voltage by the inverter circuit (130), and output this single-phase AC voltage. In the portable generator (100) output from the terminals (151, 152), the throttle opening of the engine is controlled so that the operation rate of the DC voltage generation circuit (110) is predetermined, and the operation of the DC voltage generation circuit (110) is performed. The output of the inverter circuit (130) when the rate becomes substantially the maximum operation rate and the throttle opening is almost fully opened, or when the throttle opening is almost fully opened and the engine speed is lower than a predetermined specified value. This is a method for adjusting the output of a portable generator (100) that performs control to lower the voltage.

As described above, if the throttle opening is controlled so that the operation rate of the DC voltage generating circuit (110) is predetermined,
The alternator (50) can be rotated in a stable state to generate power efficiently. In particular, in accordance with the output characteristics of the AC generator (50), the operating rate of the DC voltage generation circuit (110) is set to 65%.
By setting a specific value close to 80% so as to be in the range of% to 85%, the AC generator (50) and the engine can be efficiently driven.

As the load increases, the operating rate of the DC voltage generating circuit (110) increases, and the throttle opening is increased to increase the rotation speed of the engine, that is, the AC generator (50). 110) is approximately the maximum (100% or nearly 100%) and the throttle opening is almost fully opened, or the throttle opening is almost fully opened and the engine speed is at a predetermined specified value. When lower than, by performing control to decrease the output voltage of the inverter circuit (130), that is, the output voltage from the output terminal (151, 152), to temporarily reduce the load of the portable generator (100), It is possible to quickly increase the rotation speed of the engine and thus the rotation speed of the alternator (50), and to quickly increase the power generation amount so that output power corresponding to the load can be obtained.

According to a second aspect of the present invention, an AC generator is operated by an engine to generate an AC voltage, and the AC voltage is once converted to a DC by a DC voltage generating circuit (110) for a predetermined time. After forming a DC voltage, a single-phase AC voltage having a predetermined frequency and a constant voltage is formed by an inverter circuit (130), and the single-phase AC voltage is output from output terminals (151, 152). In the generator for use (100), a PWM reference table which is a table of a PWM control signal for controlling the inverter circuit (130) is provided, and based on a value of a difference between each PWM reference value and the output voltage value of the PWM reference table. A correction value is calculated, a correction reference value is calculated by adding or subtracting the correction value to or from the PWM reference value, and next time, a PWM control signal based on the correction reference value is formed and an output terminal is generated.
(151, 152), the operating rate of the DC voltage generating circuit (110) becomes substantially the maximum operating rate and the throttle opening is almost fully opened, or the engine is closed when the throttle opening is almost fully opened. When the rotation speed is lower than a predetermined set value, the output adjustment method of the portable generator (100) is to reduce the output voltage of the inverter circuit (130) by increasing or decreasing the correction value.

As described above, the PWM based on the PWM reference value
The method of forming the control signal is easy to control the inverter circuit (130) using a microcomputer, and by adding or subtracting the correction value to or from the PWM reference value, without using a plurality of PWM reference tables. The output voltage can be adjusted. Then, due to the increase in the load, the operation rate of the DC voltage generation circuit (110) increases, and the throttle opening is increased to increase the rotation speed of the engine, that is, the AC generator (50). When the operation rate is substantially maximum (100% or nearly 100%) and the throttle opening is almost fully opened, or when the engine speed is low despite the large throttle opening,
The output voltage of the inverter circuit (130), that is, the output terminals (151, 152)
By reducing the output voltage of the portable generator (100), the load on the portable generator (100) is reduced, the engine speed and, consequently, the speed of the AC generator (50) are rapidly increased, and the power generation amount is quickly increased. Thus, it is possible to obtain an output power corresponding to the load.

According to a third aspect of the present invention, the correction value is obtained by replacing the value of the selected variable value with a larger value by using the product of the output current value and the variable value of the predetermined value as a coefficient. A method for adjusting the output of the portable generator (100) according to the second aspect, wherein the correction value is changed by the following method. As described above, the correction value for adjusting the output voltage, which is a correction value capable of lowering the output voltage of the inverter circuit (130), is set to a value using the product of the variable value and the output current value as a coefficient. Thus, the output voltage can be adjusted by changing the value of the variable value, and the correction value is greatly changed when the output current value is large even if the rate of change in the variable value is constant. can do.

Therefore, when the load is large, the fluctuation range of the output voltage can be widened, and the operating state can be quickly adapted to the load. The present invention described in claim 4 has an AC generator (50) for generating an AC voltage, and forms an AC voltage by rotating the AC generator (50). DC voltage generating circuit to convert to DC
(110) and a DC power supply unit (120) for holding the DC voltage output by the DC voltage generation circuit (110), and further, the output voltage of the DC power supply unit (120) is fixed at a predetermined frequency. A portable generator (130) having an inverter circuit (130) for converting into a single-phase AC voltage having a voltage of 100), a conductivity detection unit (419) for detecting an operation rate of the DC voltage generation circuit (110) and an inverter circuit (130).
Signal generation unit (441) and islanding operation control unit
(435), synchronous operation control unit (437) and throttle opening control unit (4
23) and a central control means (310) provided with
Detect the voltage between (151,152) and output the output voltage signal,
And output voltage detecting means for outputting a zero-cross signal in accordance with a timing of 0 volt in the output voltage,
The islanding operation control section (435) outputs the output of the single-phase AC voltage when the zero cross signal from the output voltage detecting means is not input within a predetermined short time before the output of the single-phase AC voltage from the output terminal (151, 152) is started. The independent operation control unit (435) to be started, and the synchronous operation control unit (437) is configured to input a zero-cross signal within a predetermined short time before starting output of the single-phase AC voltage from the output terminals (151, 152). Is for starting the output of the single-phase AC voltage in accordance with the timing of the zero-cross signal.
(437), when the operation rate of the DC voltage generation circuit (110) becomes the maximum operation rate, and when the throttle opening is almost fully opened,
A portable power generator (100) that controls the PWM signal generator (441) to change the pulse width of the PWM control signal to lower the output voltage of the inverter circuit (130).

As described above, when the operation rate of the DC voltage generation circuit (110) becomes substantially the maximum operation rate and the throttle opening is almost fully opened, the output voltage of the inverter circuit (130), that is, the output terminals (151, 152) When the load suddenly increases and the throttle is fully opened or almost fully opened by the isolated operation control unit (435) or the synchronous operation control unit (437) that reduces
The output voltage is reduced to reduce the load on the portable generator (100), the engine speed and, consequently, the AC generator (50) speed is increased quickly, and the power generation amount is quickly increased to meet the load. Output power can be obtained.

Further, according to the present invention, an AC generator (50) for generating an AC voltage is provided, and an AC voltage is formed by rotating the AC generator (50). It has a DC voltage generating circuit (110) for temporarily converting the voltage to DC and a DC power supply unit (120) for holding the DC voltage output by the DC voltage generating circuit (110), and further includes a DC power supply unit (120). An inverter circuit (130) that converts the output voltage to a single-phase AC voltage having a predetermined frequency and a constant voltage, and outputs an AC output voltage obtained by removing harmonics from the output of the inverter circuit (130) to an output terminal ( 151, 152) (10
0), a duty cycle detecting section (419) for detecting an operation rate of the DC voltage generating circuit (110), a PWM signal generating section (441) for controlling the inverter circuit (130), and an isolated operation control section (435). Central control means (310) equipped with a throttle operation control section (423) and an engine rotation speed detection section (421).
And output voltage detection means for detecting the voltage between the output terminals (151, 152) and outputting an output voltage signal, and also outputting a zero-cross signal in accordance with the timing of 0 volts in the output voltage, The isolated operation controller (435) is an output terminal
(151, 152) an isolated operation control unit (435) that starts output of the single-phase AC voltage when the zero-cross signal is not input from the output voltage detection means within a predetermined short time before starting output of the single-phase AC voltage from When the zero-cross signal is input within a predetermined short time before starting the output of the single-phase AC voltage from the output terminals (151, 152), the synchronous operation control unit (437) A unit for starting voltage output, and an isolated operation control unit (435)
The synchronous operation control unit (437) includes a throttle opening control unit (42
When the opening degree control by 3) is close to the full throttle opening and the engine rotation speed is lower than a predetermined specified value, the PWM signal generation unit (441) changes the pulse width of the PWM control signal to change the pulse width of the PWM control signal. It is assumed that the portable generator (100) performs control for lowering the output voltage.

As described above, the throttle opening control section (423)
When the opening degree control is close to the full throttle opening and the engine rotation speed is lower than a predetermined specified value, the PWM signal generation unit (441) changes the pulse width of the PWM control signal to change the output voltage of the inverter circuit (130). Operation control unit (435) or synchronous operation control unit (437)
When the engine rotation speed is low, that is, when the load of the portable generator (100) is large and the engine rotation speed does not increase quickly, the output voltage is reduced even though the throttle opening is fully open. By reducing the load, the engine speed, that is, the alternator (5
0) It is possible to increase the number of revolutions, quickly increase the generated power, and output the output power according to the load.

According to a sixth aspect of the present invention, there is provided an AC generator having an AC generator for generating an AC voltage.
(50) is rotated to form an AC voltage, a DC voltage generating circuit (110) for temporarily converting the AC voltage into DC, and a DC power supply unit (DC) for holding a DC voltage output from the DC voltage generating circuit (110). And an inverter circuit (130) for converting the output voltage of the DC power supply unit (120) into a single-phase AC voltage having a predetermined frequency and a constant voltage, and an inverter circuit (130). ) A portable generator (100) that outputs the AC output voltage from the output terminals (151, 152) with the harmonics removed.
And a P controlling the conductivity detector (419) for detecting the operating rate of the DC voltage generator (110) and the inverter circuit (130).
The WM signal generation unit (441), the isolated operation control unit (435), the synchronous operation control unit (437), the throttle opening control unit (423), the engine rotation speed detection unit (421), and the detected output voltage and output Output voltage waveform monitor that calculates based on the current value
(433), and the central control means (310) provided with the PWM signal generation unit (441),
A PWM control signal having a pulse width sequentially corresponding to the M reference value is formed, and the output voltage waveform monitoring unit (433) compares the voltage table value indicating the output voltage corresponding to each PWM reference value with the detected output voltage value. Calculating a correction value obtained by subtracting or adding a value obtained by multiplying the detected output current value by a coefficient from the difference value, and storing a correction value corresponding to each PWM reference value; and
The PWM control signal based on the next PWM reference value is PWM
When the signal generation unit (441) forms the PWM based on the corrected reference value obtained by subtracting or adding the correction value from the PWM reference value.
The control signal is formed, and the isolated operation control unit (435) and the synchronous operation control unit (437) are controlled by the throttle opening control unit (423) so as to determine the operation rate of the DC voltage generation circuit (110). When the operation rate of the DC voltage generating circuit (110) is substantially the maximum operation rate and the throttle opening is almost fully opened, or the throttle opening control unit (423)
When the opening degree control is close to the full throttle opening and the engine speed is lower than a predetermined specified value, the output voltage waveform monitor (433) changes the value of the coefficient for calculating the correction value to a large value, or changes the PWM reference value. A portable generator (100) that reduces the value of the single-phase AC voltage by reducing the value of the coefficient multiplied by the value or the correction reference value.

As described above, the opening degree of the throttle is controlled in accordance with the operation rate of the DC voltage generation circuit (110), and the operation rate of the DC voltage generation circuit (110) increases due to an increase in the load.
When the operating rate of the DC voltage generating circuit (110) is substantially maximum and the throttle opening is almost fully opened, or when the engine speed is low despite the large throttle opening, the correction coefficient is changed. By increasing or decreasing the value of the coefficient to be multiplied by the PWM reference value or the modified reference value by the isolated operation control unit (435) or the synchronous operation control unit (437),
When the operation rate and throttle opening of the DC voltage generation circuit (110) increase and the output of the portable generator (100) does not follow the load, the output voltage is reduced to reduce the load of the portable generator (100). Once reduced, the output can be made to correspond to the load. When the coefficient of the correction value is changed, the correction value is obtained by subtracting or adding a value obtained by multiplying the output current value by the coefficient. When the output current value is large, that is, when the load is large, the correction value is calculated. The engine speed can be rapidly increased by making large changes and greatly reducing the load.

According to a seventh aspect of the present invention, an AC generator (50) is operated by an engine to generate an AC voltage, and the AC voltage is converted to a DC voltage by a DC voltage generating circuit (110) to generate a predetermined voltage. After the DC voltage is formed, a single-phase AC voltage having a predetermined frequency and a constant voltage is formed by the inverter circuit (130), and the single-phase AC voltage is output from the output terminals (151, 152). In the generator (100), when the operation rate of the DC voltage generation circuit (110) is lower than a specific value, and the value of the DC voltage converted into DC is higher than a predetermined voltage value, the inverter circuit (130) This is a method for adjusting the output of the portable generator (100) for increasing the output voltage.

As described above, when the DC voltage value is higher than the predetermined voltage value despite the low operating rate of the DC voltage generation circuit (110), the voltage between the output terminals (151, 152) is high,
Since the inflow of external power or the output from the output terminals (151, 152) is hardly performed, the output voltage of the inverter circuit (130), that is, the output voltage of the portable generator (100) must be increased. By the portable generator (100)
Output can be increased to achieve an appropriate load state.

According to the present invention, an AC generator (50) is operated by an engine to generate an AC voltage, and the AC voltage is converted into a DC voltage by a DC voltage generating circuit (110) to generate a predetermined voltage. After the DC voltage is formed, a single-phase AC voltage having a predetermined frequency and a constant voltage is formed by the inverter circuit (130), and the single-phase AC voltage is output from the output terminals (151, 152). In the generator (100),
A PWM reference table, which is a reference table for a PWM control signal for controlling the inverter circuit (130), is provided, and a correction value based on a difference value obtained by comparing each PWM reference value of the PWM reference table with the output voltage value is calculated. A correction reference value is calculated by adding or subtracting the correction value to or from the reference value, and a PWM control signal based on the correction reference value is formed next time, so that the operation rate of the DC voltage generation circuit (110) is higher than a specific value. When the value of the reduced DC voltage is higher than a predetermined voltage value, P
A method for adjusting the output of the portable generator (100) in which the output voltage of the inverter circuit (130) is increased by decreasing or increasing the WM reference value or the correction reference value.

As described above, the PWM based on the PWM reference value
The method of forming the control signal is easy to control the inverter circuit (130) using a microcomputer, and by adding or subtracting the correction value to or from the PWM reference value, without using a plurality of PWM reference tables. The output voltage can be adjusted. If the DC voltage value is higher than the predetermined voltage value, even though the operation rate of the DC voltage generation circuit (110) is low, the output voltage of the inverter circuit (130), that is, the portable generator (100) By increasing the output voltage of the portable generator (100), the portable generator (100) can be brought into an appropriate load state.

Further, according to the present invention, there is provided an AC generator (50) for generating an AC voltage, and an AC voltage is formed by rotating the AC generator (50). It has a DC voltage generating circuit (110) for temporarily converting the voltage to DC and a DC power supply unit (120) for holding the DC voltage output by the DC voltage generating circuit (110), and further includes a DC power supply unit (120). An inverter circuit (130) that converts the output voltage to a single-phase AC voltage having a predetermined frequency and a constant voltage, and outputs an AC output voltage obtained by removing harmonics from the output of the inverter circuit (130) to an output terminal ( 151, 152) (10
0), a duty cycle detecting section (419) for detecting an operation rate of the DC voltage generating circuit (110), a PWM signal generating section (441) for controlling the inverter circuit (130), and an isolated operation control section (435). And a central control means (310) with a synchronous operation control section (437),
Also, a DC voltage detection circuit that detects an output voltage of the DC power supply unit (120) and outputs a DC voltage signal, and an output terminal (151, 152)
Output voltage detecting means for detecting a voltage between the output voltage signal and the output voltage signal, and also outputting a zero-cross signal in accordance with the timing of 0 volt in the output voltage, the isolated operation control unit (435) includes an output terminal (151, 152). ) Is a single operation control unit (435) that starts output of a single-phase AC voltage when a zero cross signal is not input within a predetermined short time before starting output of a single-phase AC voltage, and a synchronous operation control unit (437). ) Is the output terminal (1
(51, 152), when the zero-cross signal is input within a predetermined short time before the output of the single-phase AC voltage is started, the output of the single-phase AC voltage is started in accordance with the timing of the zero-cross signal, and further, the conductivity detection unit When the operation rate of the DC voltage generation circuit (110) detected in (419) is lower than a specific value and the output voltage of the DC power supply unit (120) is higher than a predetermined voltage value,
A portable generator (100) that also controls the PWM signal generator (441) to increase the output voltage of the inverter circuit (130) by changing the pulse width of the PWM control signal.

As described above, when the zero-cross signal is input within a predetermined short time before the output of the single-phase AC voltage from the output terminals (151, 152) is started, the output of the single-phase AC voltage is synchronized with the timing of the zero-cross signal. The synchronous operation control unit (437), the operation rate of the DC voltage generation circuit (110) detected by the conductivity detection unit (419) is lower than a specific value and the output of the DC power supply unit (120). When the voltage is higher than a predetermined voltage value, the synchronous operation control unit (437) that also controls the PWM signal generation unit (441) to increase the output voltage of the inverter circuit (130) by changing the pulse width of the PWM control signal. )
When the DC voltage value is higher than a predetermined voltage value even though the operation rate of the DC voltage generation circuit (110) is low, the flow of external power or Since the output from the output terminals (151, 152) is hardly performed, the inverter circuit (13
0), that is, by increasing the output voltage of the portable generator (100), it is possible to increase the output of the portable generator (100) to an appropriate load state and to perform stable parallel operation. it can.

The present invention described in claim 10 provides the following:
Having an AC generator (50) for generating an AC voltage, forming an AC voltage by rotating the AC generator (50),
DC voltage generation circuit (110) that converts this AC voltage to DC once
And a DC power supply unit (120) for holding a DC voltage output from the DC voltage generation circuit (110).
0) has an inverter circuit (130) that converts the output voltage of the predetermined frequency to a single-phase AC voltage having a predetermined frequency and a constant voltage,
A portable generator (100) that outputs an AC output voltage obtained by removing harmonics from an output of an inverter circuit (130) from output terminals (151, 152), and is a conduction detector that detects an operation rate of a DC voltage generation circuit (110). The PWM signal generator (441) and the isolated operation controller (435) and the synchronous operation controller (437), which control the rate detector (419) and the inverter circuit (130), and the detected output voltage and output current values. Output voltage waveform monitor (4
33), and the PWM signal generation unit (441) includes a PWM control unit (441) which stores the PWM signal stored in the PWM reference table.
A PWM control signal having a pulse width sequentially corresponding to the reference value is formed, and the output voltage waveform monitoring unit (433) outputs a difference between the voltage table value indicating the output voltage corresponding to each PWM reference value and the detected output voltage value. , A correction value obtained by adding or subtracting a value obtained by multiplying the value of the difference by a coefficient is calculated, a correction value corresponding to each PWM reference value is stored, and a PWM control signal based on the next PWM reference value is calculated. When the PWM signal generation unit (441) forms a PWM control signal based on a corrected reference value obtained by subtracting or adding a correction value from the PWM reference value, the synchronous operation control unit (437) includes a conductivity detection unit When the operation rate of the DC voltage generation circuit (110) detected in (419) is lower than a predetermined value and the output voltage of the DC power supply unit (120) is higher than the predetermined voltage value, the output voltage waveform monitoring unit The corrected reference value calculated in (433) and the coefficient to be multiplied by the PWM reference value The by changing a portable generator to raise the voltage value of the single-phase AC voltage (100).

As described above, when the zero-cross signal is input within a predetermined short time before the output of the single-phase AC voltage from the output terminals (151, 152) starts, the output of the single-phase AC voltage is synchronized with the timing of the zero-cross signal. The synchronous operation control unit (437), the operation rate of the DC voltage generation circuit (110) detected by the conductivity detection unit (419) is lower than a specific value and the output of the DC power supply unit (120). When the voltage is higher than a predetermined voltage value, the synchronous operation control unit (437) that also controls the PWM signal generation unit (441) to increase the output voltage of the inverter circuit (130) by changing the pulse width of the PWM control signal. )
When the DC voltage value is higher than a predetermined voltage value even though the operation rate of the DC voltage generation circuit (110) is low, the inverter circuit (130)
By increasing the output voltage of the portable generator (100), that is, the output voltage of the portable generator (100), the output of the portable generator (100) can be increased, and a stable parallel operation can be performed under an appropriate load condition.

[0063]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable generator according to the present invention rotates an AC generator by an engine having an output of several kilowatts to about 10 kilowatts, temporarily converts the three-phase output voltage of the AC generator to DC, It is a portable generator that is converted into an AC by a circuit to form a single-phase AC output voltage, which is frequently moved and used at the place of use, and is sometimes brought into the place of use and operated in a fixed installation state. is there.

This portable generator has an AC generator 50 for rotating a rotor by an engine and, as shown in FIG. A power circuit 101;
A microcomputer as central control means 310 for setting the frequency of the output voltage output from the output terminal of the portable generator 100 based on a detection signal from a detection circuit provided in each section. The portable generator 100 includes a control power supply unit 201 that generates operating power for the control unit and the detection circuit.

The central control means 310 includes a setting switch 318
By setting the frequency of the output voltage to a predetermined constant frequency such as 50 Hz or 60 Hz, based on detection signals from the DC voltage detection circuit 320, the output current detection circuit 330, and the output voltage detection circuit 340 provided in the power circuit 101. Controls the operation of the inverter circuit 130, and further detects the engine throttle based on the conductivity detection signal indicating the operation state of the thyristor control circuit 170, the detection signal from the rotation speed detection circuit 319, and the opening signal from the throttle control mechanism 315. Opening / closing control is also performed.

The setting switch 318 is capable of adjusting the output voltage in addition to setting the frequency. The AC generator 50 in the portable generator 100 has a three-phase output winding 51 and a single-phase output winding 55, and the three-phase output winding 51 is connected to the power circuit 101, and the single-phase output winding 55 is connected to the control power supply unit 201.

The output terminal of the three-phase output winding 51 is connected to a DC voltage generating circuit 110 by a rectifying bridge using three rectifying diodes 115 and three thyristors 111, as shown in FIG. Connect and gate voltage generator 1
60 is also connected. This DC voltage generating circuit 110 connects the connection point between the cathode of each rectifier diode 115 and the anode of each thyristor 111 to each output terminal of the three-phase output winding 51, and collects the anodes of each rectifier diode 115. To the negative terminal of the DC power supply unit 120 and the inverter circuit 130, and collectively connect the cathodes of the thyristors 111 to the DC power supply unit 1.
It is connected to the + terminal of 20 and the inverter circuit 130.

The gate voltage generating circuit 160 connected to the output terminal of the three-phase output winding 51 is formed using a rectifying diode, a limiting resistor, a power supply capacitor, and a Zener diode. That is, each output terminal of the three-phase output winding 51 is connected to the anode of the rectifying diode 161 and the cathode of each rectifying diode 161 is shared.
A negative terminal of the power supply capacitor 165 is connected to the + terminal of the DC power supply unit 120 via a 63, and a zener diode 167 is connected in parallel with the power supply capacitor 165.

Therefore, the gate voltage generation circuit 160
A voltage higher than the voltage of the + terminal of the DC power supply unit 120 by the specified voltage of the Zener diode 167 can be formed and output. The output terminal of the gate voltage generation circuit 160 is connected to each gate terminal of each thyristor 111 in the DC voltage generation circuit 110 via the thyristor control circuit 170.

The thyristor control circuit 170 comprises a switching transistor 173, a switch control resistor 171 and a photocoupler 175. That is, the collector of the PNP transistor serving as the switching transistor 173 is connected to the output terminal of the gate voltage generating circuit 160, and the emitter of the switching transistor 173 is connected to the gate terminal of each thyristor 111. The thyristor 111
When connecting to the gate terminal, the protective resistor 117 is used to connect to the gate terminal.

The base of the switching transistor 173 is connected to the output terminal of the gate voltage generation circuit 160 via the switch control resistor 171, and the switch control resistor 1
The midpoint of 71 is connected to the + terminal of the DC power supply unit 120 via the phototransistor 176 of the photocoupler 175. still,
The phototransistor 176 of the photocoupler 175 has a collector connected to the middle point of the switch control resistor 171, an emitter connected to the + terminal of the DC power supply unit 120, and a light emitting diode 177 of the photocoupler 175 having the anode connected to the control power supply. The cathode of the light emitting diode 177 is connected to the output terminal of the second control voltage Vcc in the unit 201, and the constant voltage detection circuit 180 and the stop circuit 36
0, connected to the overcurrent detection circuit 350 and the like.

Therefore, the thyristor control circuit 170
When the light emitting diode 177 of the photocoupler 175 turns on,
The phototransistor 176 becomes conductive, the midpoint potential of the switch control resistor 171 drops to the + terminal voltage of the DC power supply unit 120, and the switching transistor 173 becomes nonconductive. When the light-emitting diode 177 does not light, the switching transistor 173 is turned on to supply the output current of the gate voltage generation circuit 160 to each thyristor 111 as the gate current of the thyristor 111. Each thyristor 111 of the generation circuit 110 is turned on.

Therefore, the output power of the three-phase output winding 51 can be supplied to the DC power supply unit 120 connected to both output terminals of the DC voltage generation circuit 110. Also, DC voltage generation circuit
The inverter circuit 130 connected to both output terminals of the 110 is a bridge circuit with a power transistor and a smoothing capacitor.
173. This inverter circuit 130 has a first
The transistor 131 and the third transistor 133 are connected in series to the DC power supply unit 120, and the second transistor 132 and the fourth transistor 134 are connected in series to the DC power supply unit 120, and the first transistor 131 and the third transistor The midpoint of 133 is connected to a first output terminal 151 via a low-pass filter 140,
The midpoint between the second transistor 132 and the fourth transistor 134 is connected to the second output terminal 152 via the low pass filter 140.

The single-phase output winding 55 of the AC generator 50 is connected to the smoothing circuit 210 of the control power supply 201 as shown in FIG. The smoothing circuit 210 includes four rectifying diodes 2
The bridge rectifier circuit 11 performs full-wave rectification to charge the smoothing capacitor 215. The control power supply unit 201 has a first constant voltage circuit 221 and a second constant voltage circuit 225 and a regulator 230 in addition to the smoothing circuit 210, and the output voltage of the smoothing circuit 210 is adjusted to 15 volts by the first constant voltage circuit 221. And the first reverse current blocking diode 233
To the regulator 230 through the DC power supply unit 120
Is set to a constant voltage of about 12 volts by the second constant voltage circuit 225, and the second reverse current blocking diode 234
Is applied to the regulator 230.

In the regulator 230, a first control voltage Vss of about 10 volts and a second control voltage Vcc of about 5 volts are formed. The second control voltage Vcc is supplied to the central control means 310 and other control circuit elements. It should be noted that the control power supply unit 201 normally outputs the smoothing circuit 21 from the AC voltage output from the single-phase output winding 55.
The 0 and the DC voltage formed by the first constant voltage circuit 221 are supplied to the regulator 230, and the regulator 230 forms the first control voltage Vss and the second control voltage Vcc and supplies them to each circuit element. Then, when a failure such as a disconnection occurs in the single-phase output winding 55 or the like, if the DC power supply unit 120 is operating, power is supplied to the regulator 230 by the second constant voltage circuit 225,
The first control voltage Vss and the second control voltage Vcc are output from the regulator 230, and the operation of the portable generator 100 is maintained.

Further, the switch circuit for detecting and switching the output voltage of the first constant voltage circuit 221 may be disposed on the input side of the regulator 230 instead of the first backflow prevention diode 233 and the second backflow prevention diode 234. is there. In this case, the output voltage of the first constant voltage circuit 221 and the second constant voltage circuit 225
The power from the first constant voltage circuit 221 is normally supplied to the regulator 230 while the output voltage of the second constant voltage circuit 221 is stopped, and the output voltage from the second constant voltage circuit 225 is stopped when the output of the first constant voltage circuit 221 stops. The switch circuit may be switched so as to supply the voltage to the regulator 230. Further, the AC generator 50 having no single-phase output winding 55 is used, and the smoothing circuit 210 and the first
In some cases, the constant voltage circuit 221 is omitted, the voltage of the DC power supply unit 120 is reduced by the second constant voltage circuit 225, and the power of the DC power supply unit 120 is always supplied to the regulator 230 to form a control voltage.

As shown in FIG. 3, the constant voltage detection circuit 180 for controlling the voltage of the DC power supply unit 120 uses a resistor, a Zener diode, and a switching transistor.
The voltage of the DC power supply unit 120 is divided by the voltage dividing resistors 181 and 182 in which two resistors are connected in series, and the midpoint potential of the voltage dividing resistors 181 and 182 is further reduced by the Zener diode 183 and the detection resistor 184 to detect the voltage. Schmitt circuit 1 for the potential of resistor 184
85, which controls the conduction of the switching transistor 187.

Further, the switching transistor 187
Is connected in series with the light-emitting diode 177 of the photocoupler 175 in the thyristor control circuit 170, and controls the lighting of the light-emitting diode 177 by applying a second control voltage Vcc to the series-connected light-emitting diode 177 and cutting off the conduction of the switching transistor 187. . Therefore, this constant voltage detection circuit 180
Is the detection resistor 1 when the output voltage of the DC power supply 120 rises.
The detection potential of 84 rises and the switching transistor 187
Is turned on to light the light emitting diode 177. For this reason, the thyristor control circuit 170 stops outputting the conduction signal to the DC voltage generation circuit 110, puts each thyristor 111 of the DC voltage generation circuit 110 into a non-conduction state, and outputs the power from the AC generator 50 to the DC power supply unit 120. Stop supply.

When the voltage of the DC power supply unit 120 drops, the switching transistor 187 is turned off, and a continuity signal is output from the thyristor control circuit 170 to turn on each thyristor 111 of the DC voltage generation circuit 110. In this manner, the potential of the DC power supply unit 120 can be always kept constant by the constant voltage detection circuit 180.

The DC voltage detecting circuit 320 connects the voltage dividing resistor 325 so as to be inserted between both terminals of the DC power supply unit 120. The voltage is divided and the output voltage value of the DC power supply unit 120 is input to the central control means 310 as a DC voltage signal. An output voltage detection circuit 340 inserted between the inverter circuit 130 and the low-pass filter 140 detects the voltage by dividing the first output voltage and the second output voltage of the inverter circuit 130 by a voltage-dividing resistor. A first detection voltage obtained by dividing the first output voltage by the voltage dividing resistors 341 and 342, and a second detection voltage obtained by dividing the second output voltage by the voltage dividing resistors 343 and 344, respectively. The output voltage signal is input to the central control unit 310 via the low-pass filters 347 and 348 for detection.

The output voltage detecting circuit 340 and the rectangular wave forming circuit 317 are used as output voltage detecting means, and the output voltage signal output from the output voltage detecting circuit 340 is used as the central control means 3.
At the time of input to the central control means 310, the first output voltage signal and the second output voltage signal, which are analog signals, are input to the central control means 310, and the first output voltage signal and the second output voltage signal are converted into a rectangular wave forming circuit. The signal is also input to the central control unit 310.

This rectangular wave forming circuit 317 forms a rectangular wave based on the difference voltage between the first output voltage and the second output voltage forming a sine wave, and outputs the first output voltage and the second output forming a sine wave. The zero cross point in the voltage difference from the voltage is defined as the edge of this rectangular wave, and a zero cross signal indicating the timing of the zero cross point in the output voltage output from the portable generator 100 is input to the central control means 310.

Further, the output current detection circuit 330 detects the current flowing from the inverter circuit 130 to the low-pass filter 140 with the detection resistor 331 and uses the detection low-pass filter 335 to remove the harmonic component from the output current signal. It is input to the central control means 310 and the overcurrent detection circuit 350. The output current detection circuit 330 may be provided on the input side of the inverter circuit 130. When the output current detection circuit 330 is provided on the input side of the inverter circuit 130,
Output current detection circuit 330 between the side terminal and the inverter circuit 130.
Is provided, it becomes easy to lower the absolute voltage of the output current signal output from the output current detection circuit 330.

As the output current detecting circuit 330, not only the case where the detecting resistor 331 is used, but also a current detector using an induction coil may be used. The overcurrent detection circuit 350 includes resistors 351 and 352, a comparator 355, and a switching transistor 357.
The output current detection circuit 33
When the potential of the output current signal output by 0 becomes higher than the reference voltage, the switching transistor 357 is turned on.

Further, the switching transistor 357
Has an emitter grounded and a collector connected to the cathode of the light emitting diode 177 in the photocoupler 175. Therefore, when the switching transistor 357 is turned on, the overcurrent detection circuit 350
To stop the output of the conduction signal. The central control means 310
The DC voltage signal from the DC voltage detection circuit 320, the output current signal from the output current detection circuit 330, and the output voltage signal from the output voltage detection circuit 340 of the output voltage detection means and this output voltage signal The zero-cross signal from the square wave forming circuit 317 of the output voltage detecting means based on the input signal is input as a detection signal, and the detection signal of the frequency of the output voltage output from the three-phase output winding 51 also rotates from the rotation speed detection circuit 319. The signal is input as a number signal, the cathode potential of the light emitting diode 177 is also input as a conductivity detection signal, and the throttle control mechanism 315 also receives a throttle opening signal. However, the opening signal from the throttle control mechanism 315 may be omitted, and the throttle opening control unit 423 may store the opening amount of the throttle.

The central control means 310 to which these detection signals are input operates as shown in FIG.
In addition to the PWM signal generation section 441 for outputting a control signal to the PWM driver, the output voltage signal from the output voltage detection circuit 340 and the zero-cross signal from the rectangular wave formation circuit 317 determine whether control is started alone or in parallel at the start of control. Single operation control unit 435 and synchronous operation control unit that control signal generation unit 441
437, an output voltage setting unit 417 that adjusts and sets the output voltage of the single-phase AC voltage by a signal from the setting switch 318, an output frequency setting unit 415 that sets the frequency of the single-phase AC voltage by a signal from the setting switch 318, and A voltage waveform monitoring unit 433 that monitors a single-phase AC voltage output from the first output terminal 151 and the second output terminal 152 based on an output voltage signal from the output voltage detection circuit 340, and a rotation speed from the rotation speed detection circuit 319. An engine speed detector 421 for judging the engine speed by a signal, a throttle opening controller for outputting a rotation control signal to a throttle driver 313 based on an output current signal, an engine speed signal and an opening signal from a throttle control mechanism 315. 423, and outputs a stop control signal to the stop circuit 360 based on the output current signal from the output current detection circuit 330 and the DC voltage signal from the DC voltage detection circuit 230. Protection unit 4
31, light emitting diode 177 in thyristor control circuit 170
The operating ratio of the DC voltage generating circuit 110, that is, the duty ratio of the thyristor 111 in the DC voltage generating circuit 110 is detected by the cathode potential of the thyristor 111. A display control unit 425 that outputs a signal that causes the operation state display unit 427 to display the operation status of the unit 100 is formed.

Although not shown, the central control means 310, which is a microcomputer, has a crystal oscillator of about 10 megahertz, and operates using the output of the crystal oscillator as a reference clock. It has a read-only memory in which programs and control data tables are recorded, a random access memory for performing arithmetic processing, and a frequency dividing circuit for dividing a reference clock to form a required clock signal. An analog-to-digital converter 411 for converting an input analog signal into a digital signal is also provided.

When the throttle control mechanism 315 controls the rotation of the throttle valve using a pulse motor, a pulse counter is built in the throttle opening control section 423, and the throttle opening control section 423 outputs a signal to the throttle driver 313. In some cases, the count value is counted up or down in accordance with the rotation control signal to be performed, and the throttle opening control unit 423 stores the throttle opening data without the opening signal from the throttle control mechanism 315.

The throttle opening control section 423 is based on the rotation speed data from the engine rotation speed detection section 421 based on the rotation speed signal from the rotation speed detection circuit 319 and the throttle opening signal or the throttle opening data. When controlling the throttle opening with the throttle opening control unit 423, the operation rate of the DC voltage generation circuit 110 is set to 80% in accordance with the maximum efficiency of the AC generator 50. Control so that it is before and after.

That is, based on the operating rate of the DC voltage generating circuit 110 based on the ratio of whether or not the cathode potential of the light emitting diode 177 in the thyristor control circuit 170 is the ground level as the conductivity detection signal input to the conductivity detection section 419. ,
When the duty ratio of the thyristor 111, which is the operating rate of the DC voltage generation circuit 110, is lower than a predetermined value such as 70%, control is performed to change the opening in the direction to close the throttle in accordance with the value of the duty ratio, and The amount of power generated by the generator 50 is reduced. Further, when the conductivity exceeds a predetermined value such as 90%, control is performed to change the opening in a direction to open the throttle greatly to increase the engine speed, and the alternator 50
To increase power generation.

Accordingly, when the output power from the portable generator 100 is large according to the state of the load, the alternator 5
By increasing the power generation amount of 0, power generation can be performed according to the load. Then, the PWM signal generator 441
Has a PWM reference table, outputs a PWM control signal to the PWM driver 311 based on the PWM reference table, and outputs the first transistor 1
It controls the on / off of each of the transistors from the 31st to the fourth transistor 134.

This PWM reference table contains a large number of PWMs.
4 is a table for storing reference values, wherein each PWM reference value is
The number is set to about one hundred to several hundreds corresponding to the value of the curve forming one cycle of the sine wave curve. Then, the PWM signal generation unit 441 of the central control unit 310 outputs the PWM
PWM reference values are sequentially read from the M reference table and
An M control signal is formed, and this PWM control signal is output to the PWM driver 311.

When the leading value of the PWM reference table is 0, the PWM control signal is applied to each of the PWM reference values obtained by reading a value corresponding to a half of one clock time in a read clock for reading the PWM reference value. In addition, PWM
When the reference value is 0, a pulse signal having a duty ratio of 50% is formed. For this reason, as shown in FIG. 5A, each pulse of the PWM control signal sequentially changes the duty ratio in accordance with the sine wave shape, and the duty ratio varies from several tens percent to 100 percent around 50 percent. The pulse signal train forms a reference sine wave that sequentially changes with a value in the range up to several tens percent before.

Then, the PWM driver 311
A first PWM signal, which is obtained by amplifying the current of the WM control signal and outputting it to the first transistor 131 and the fourth transistor 134, and a second transistor 132 which inverts and amplifies the PWM control signal.
And a second PWM signal to be output to the third transistor 133, and outputs the first PWM signal and the second PWM signal to the inverter circuit 130.

Further, the voltage waveform monitor 4 of the central control means 310
Reference numeral 33 denotes an output voltage value table for storing a number of voltage table values corresponding to each PWM reference value. The output voltage value table is read from the voltage table value in accordance with the timing at which the PWM reference value is read from the PWM reference table. And compares the read voltage table value with the value of the output voltage input from the output voltage detection circuit 340 to obtain the PWM value.
The pulse width of each pulse signal forming the PWM control signal output from the signal generation unit 441 is corrected to adjust the output voltage.

When a start switch (not shown) is operated to output a PWM control signal from the PWM signal generation section 441 and start outputting a single-phase AC voltage from the first output terminal 151 and the second output terminal 152. The central control unit 310 determines whether or not the zero-cross signal from the rectangular wave forming circuit 317 in the output voltage detecting unit is input. If the zero-cross signal is not input, the isolated operation control unit 435
Start the operation of.

When the operation of the isolated operation control section 435 is started, the PWM signal generation section 441 of the central control means 310 is started.
Is an average output voltage between the first output terminal 151 and the second output terminal 152, such as 100 volts set by the setting switch 318, and a frequency of 50 Hz or 6 Hz.
A PWM control signal for generating a voltage of 0 Hz is output.

The frequency of the output voltage ranges from 100 to several hundreds of PWMs forming one cycle of the single-phase AC voltage recorded in the PWM reference table of the PWM signal generator 441.
The frequency of the single-phase AC voltage output from the portable generator 100 is set to 50 Hz or 60 Hz depending on whether a clock for reading the reference value in 20 ms or a clock for reading in 16.66 ms is selected. It is stipulated.

The output voltage is set by setting switch 318
PWM based on the signal from the voltage adjustment switch at
The correction reference value is formed by multiplying or adding the correction value to the PWM reference value recorded in the reference table, and each pulse width of the pulse signal used as the PWM control signal is determined based on the correction reference value. Then, a correction value for calculating a correction reference value from the PWM reference value is formed by the output voltage setting unit 417, and the correction value is read from the output voltage setting unit 417 by the isolated operation control unit 435, and the correction value is generated by the PWM signal generation unit. This is done by handing over to part 441.

Further, after the PWM control signal is output from the PWM signal generation section 441, the output voltage waveform monitoring section 433 monitors the peak voltage and the sine wave distortion based on the output voltage signal from the output voltage detection circuit 340. If the peak voltage fluctuates from the set value, a correction value for correcting the difference from the set voltage is read from the output voltage waveform monitoring unit 433 to the PWM signal generation unit 441. Further, even when the distortion of the sine wave continues, the correction value is read into the PWM signal generation unit 441, and a single-phase AC voltage which is a set voltage and has a smooth sine wave is output.

The waveform of the single-phase AC voltage is distorted depending on the capacity and type of the load.
By correcting the M control signal, control is performed such that the output voltage always has a predetermined sine wave shape. In this correction, a correction value Y for correcting the PWM reference value is stored in association with each PWM reference value based on the internal impedance of the power circuit 101, the output current value, and the output current value.
When the PWM signal is generated next time by the PWM signal generator 441 based on the M reference value, the correction is performed by adding or subtracting the correction value Y corresponding to each PWM reference value. Then, a PWM control signal is formed by the corrected reference value which is the corrected PWM reference value.

This correction value Y is determined by N in the PWM reference table.
The PWM control signal is read out from the PWM signal generation section 441 by reading the PWM reference value Pn, and the output voltage value, which is the potential difference between the first output terminal 151 and the second output terminal 152, is V. If the output current value at this time is I amperes, the correction values Yn corresponding to the respective PWM reference values Pn are obtained by using the constants M, T, Z, S and the variable K as coefficients. A correction value Yn where Yn = [(Qn−V / M) / T] −I · Z · S · K is calculated for the Nth PWM reference value Pn, and this correction value Yn is stored. Next PW after one cycle
As the M reference value Pn, a PWM control signal is output from the PWM signal generation unit 441 based on a PWM reference value that is a corrected reference value calculated by correction as Pn + Yn or Pn−Yn.

When the correction value Yn is calculated, the portable generator 100 does not operate when the pulse signal as the PWM control signal based on the Nth PWM reference value Pn is output from the PWM signal generation section 441. A voltage table value indicating an output voltage to be generated between the first output terminal 151 and the second output terminal 152 in a load state, and M is a change value of the voltage table value corresponding to a 1 volt change of the output voltage. is there. Z is the internal impedance of the power circuit 101, that is, the impedance of the low-pass filter 140, and S is the PWM reference value that causes a change of 1 volt between the first output terminal 151 and the second output terminal 152. T is the ratio between the change in the PWM reference value and the change in the voltage table value corresponding to a 1 volt change in the output voltage.

The variable K is set to a normal normal value of “1”.
When the DC voltage, which is the output voltage of the DC power supply unit 120, slightly exceeds a predetermined setting range, or when the rotation speed of the AC generator 50, that is, the rotation speed of the engine is low with respect to the throttle opening, the mobile phone is used. When a state deviating from the normal operation of the power generator 100 occurs, the value is changed by several percent to ten percent to change the numerical value.

Therefore, in the portable generator 100, in the central control means 310, the voltage table value Qn corresponding to the no-load output voltage when the PWM control signal having the predetermined pulse width is output from the PWM signal generator 441. And this PW
It is a voltage correction term based on the difference between the output voltage based on the M control signal and the actually detected output voltage value V (Qn-V /
M) / T, and each PWM so that the Nth PWM reference value Pn is corrected by I.Z.S.K. which is a current correction term based on the internal impedance Z and the output current at this time.
The reference value can be corrected to form a PWM control signal.

For this reason, as shown in FIG.
The output voltage and the output current are reduced when a fast-phase load causing a phase difference between the first output terminal 151 and the second output terminal 152 is connected, or when a lagging load is connected to the first output terminal 151 and the second output terminal 152. Even if the output voltage is distorted due to the phase difference and the current value, the correction value Yn having the current correction term (I.Z.S.K) for correcting the output voltage according to the instantaneous current value I is used. Since each PWM reference value Pn is corrected by a correction value Yn having a voltage correction term for correcting a difference between a voltage table value Qn as a no-load output voltage and a detected output voltage V, the output voltage Irrespective of the phase difference between the output current and the output current, it is possible to perform correction to make the waveform of the output voltage closer to an appropriate sine wave regardless of the value of the output current.

In this portable power generator 100, the characteristics of the inverter circuit 130 and the low-pass filter 140 cause
When the value of the WM reference value changes by 1, the first output terminal 15
Although a voltage change of S volts occurs between the first output terminal 152 and the second output terminal 152, the output voltage detection circuit 340 of the output voltage detection circuit 340 changes the voltage table value Qn corresponding to the output voltage change value S volts by one. If the voltage division ratio and the AD conversion ratio when converting the output voltage signal from an analog signal to a digital signal are determined, each PWM reference value stored in the PWM reference table and each voltage table value stored in the output voltage value table And can be kept equal. Further, an output voltage detection circuit is provided to make the PWM reference value and the voltage table value equal.
If the partial pressure ratio and the AD conversion ratio of 340 are determined, the constant M and the constant T for obtaining the correction value Yn are also set to 1, so that Yn = (Qn-V) -IZZSK Since K has a normal value of 1, Yn = (Qn-V) -I.Z.S. The central control based on the detected output voltage value V and the detected output current value I The operation in the means 310 can be processed.

Further, the ratio between the value of the output current signal output from the output current detection circuit 330 and the value of the output current itself, and the AD conversion ratio when converting the output current signal from an analog signal to a digital signal are specified. The ratio of the value of the digital output current signal to the value of the output current is made equal to the product of the internal impedance Z of the power circuit 101 and the output voltage change value S when the value of the PWM reference value changes by 1. In this case, the value of the output current signal converted into a digital signal by the analog-to-digital converter 411 of the central control means 310 is directly used as the value of I.Z.S in the current correction term (I.Z.S.K). Arithmetic processing can be performed.

Therefore, P stored in the PWM reference table
PWM in which the leading value of the WM reference value is 0, and the duty ratio is 50% based on the PWM reference value of 0
In the central control means 310 having the PWM signal generation unit 441 for forming the control signal, the value of the output current signal is set to the value of the current correction term when the variable K is 1, and when the value of the variable K is other than 1, In the output voltage waveform monitoring unit 433, the difference between the PWM reference value stored in the PWM reference table and the value of the output voltage signal input to the output voltage waveform monitoring unit 433 is input to the output voltage waveform monitoring unit 433. By simply subtracting the value obtained by multiplying the value of the output current signal by the variable K, it is possible to calculate and store each correction value Yn corresponding to each PWM reference value Pn,
In this case, each correction value Yn can be easily obtained from the difference between the voltage table value Qn and the detected output voltage value V, and the detected output current value I and the variable K as Yn = (Qn−V) −I · K. The calculated value can be stored in the output voltage waveform monitoring unit 433.

Then, the variable K is set to "1" as a normal value, and is detected by the rotation speed signal despite the fact that the throttle opening is increased to near the full opening by the control signal from the throttle opening control unit 423. When the engine speed does not increase, the value of the variable K is changed to a value that is about several percent larger. When forming a PWM control signal using the calculated and stored correction values Yn, the duty ratio is set to 50% in accordance with the leading value of 0, and each PWM reference value Pn is set in the first half of one cycle. In the latter half cycle, which is the latter half cycle, each PWM
When forming each pulse of the PWM control signal with the reference value Pn being a negative value, the correction value Yn is added to each PWM reference value Pn in the first half cycle, and the correction value Yn is calculated from each PWM reference value Pn in the second half cycle. It shall be subtracted.

For this reason, the output voltage formed by this control is, as shown in FIG. 7, the first output voltage V1 which is the output voltage of the first output terminal 151, and the output voltage which is the output voltage of the second output terminal 152. (2) In a half cycle larger than the output voltage V2, if the correction value Yn is added to the PWM reference value Pn, the output voltage Vn detected from the voltage table value Qn which is the value of the ideal output voltage is obtained.
Is large and the correction value Yn is a negative value, the correction reference value (Pn + Yn) can be calculated as Pn + {(Qn−V) −I · K}, so that the correction reference value (Pn + Yn) is PW
The pulse width of the PWM control signal is changed based on the corrected reference value, and the first output voltage
Since 1 is corrected to be small and the second output voltage V2 is corrected to be large, the output voltage V, which is the difference between the first output voltage V1 and the second output voltage V2, can be reduced.

In a half cycle in which the first output voltage V1 is smaller than the second output voltage V2, the correction value Yn is subtracted from the absolute value of the PWM reference value Pn to obtain Pn-｛(Qn-V)- If I · K｝, the first output voltage V1 is increased when the detected output voltage V is larger than the voltage table value Qn, which is the value of the ideal output voltage, and when the correction value Yn is a negative value. The output voltage V, which is the difference between the first output voltage V1 and the second output voltage V2, can be reduced by correcting the second output voltage V2 to a small value.

The correction value Yn is equal to the output voltage value V
And a voltage correction term based on the voltage table value Qn and a current correction term based on the output current value I in consideration of the internal impedance Z. Therefore, when the output current is large, the single-phase The correction amount of the AC voltage can be largely corrected, and the correction amount of the output voltage V output from the first output terminal 151 and the second output terminal 152 can be made appropriate.

Further, in this output voltage waveform monitoring section 433,
Based on the throttle opening signal from the throttle control mechanism 315 or the throttle opening data stored in the throttle opening control unit 423, the engine rotation speed detecting unit 421 is used when the throttle opening is almost fully opened. When the number of rotations detected in is low, the value of the variable K is changed to a large value.

Therefore, the throttle opening degree control unit 423 controls the throttle opening degree, that is, the rotation speed of the engine or the alternator 50 in accordance with the load condition, and increases the throttle opening in accordance with the increase in the load. When the rotation speed of the engine does not become high despite the degree of opening being almost or almost full opening, the output voltage V is reduced by increasing the negative value of the correction value Yn including the variable K in the subtraction coefficient. Can be.

As a result, the output voltage from the portable generator 100 decreases, and the load on the AC generator 50 decreases. And the output of the alternator 50 can be made to quickly follow the sudden increase in the load. Therefore, during normal operation, efficient power generation can be performed without using an engine having unnecessary large torque. The output power can be adjusted to the state of the load.

In the above-described embodiment, the variable K for changing the numerical value on the condition of the throttle opening and the engine speed is used as the current correction term of the correction value Yn.
The voltage table value Qn and the internal impedance Z, the ratio M between the change amount of the output voltage and the change amount of the voltage table value, the ratio S between the change amount of the output voltage and the change amount of the PWM reference value, the PWM reference value Y = [(Qn−V / M) / T] −I · Z · S by the detected voltage value V and the detected current value I based on T, which is the ratio of the change amount of the voltage table value to the change amount of the voltage table value. In some cases, the PWM reference value Pn itself is multiplied by the variable K, or the PWM reference value Pn is multiplied by a variable K by adding or subtracting a correction value Yn to or from the correction reference value Yn.

When the variable K is multiplied by the variable K as a coefficient of the PWM reference value or the modified reference value, the normal operation is performed when the engine speed is low despite the large throttle opening. The value of the variable K is changed to a value smaller than the value “1”. The determination of the value of the variable K is not limited to the case of being performed by the output voltage waveform monitoring unit 433. And this PW
A variable K as a coefficient of the M reference value or the modified reference value is read by the PWM signal generation unit 441, and the PWM signal generation unit 441 reads the variable K.
The calculation may be performed when forming the control signal.

As described above, when the value of the variable K as the coefficient of the current correction term is largely changed, or when the value of the variable K as the coefficient of the PWM reference value or the modified reference value is changed to a small value, When the throttle opening reaches 90% of full throttle, it is set to 0. The value of the variable K is increased or decreased by a few percent, and when the opening of the throttle exceeds 90%, the value of the variable K is increased or decreased in a stepwise manner. The numerical value may be changed in multiple stages so that is set to a large value or a small value of about 3 to 5% with respect to the normal value “1”.

When the value of the variable K is changed when the opening of the throttle is fully or almost fully opened, the numerical value is changed based on the throttle opening and the rotation speed of the engine, that is, the AC generator 50. Otherwise, the value of the variable K may be sequentially changed based on the throttle opening and the operation rate of the DC voltage generation circuit 110 based on the conductivity detection signal.

The throttle opening and the DC voltage generation circuit 11
When changing the value of the variable K based on the operation rate of 0,
The operating rate of the DC voltage generation circuit 110 is 95% or 98
It is assumed that the DC voltage generation circuit 110 has substantially reached the maximum operation rate when a predetermined value such as a percentage is exceeded, and when the DC voltage generation circuit 110 is substantially at the maximum operation rate, the throttle opening is 90% or more. By changing the value of the variable K from the normal value "1" when the engine is fully opened or close to the fully opened state, the engine speed is rapidly increased when the load suddenly increases, and the output voltage is increased.

A pulse signal with a duty ratio of 50% is used as a PWM control signal in the central control means 310.
The minute time until the output voltage value signal indicating 0 of the output voltage is input to the central control means 310 by the pulse signal is preset in advance by the circuit characteristics of the inverter circuit 130 and the like and detected as the voltage table value. Although the output voltage values are compared with each other, this minute time difference is corrected based on the zero-cross signal input from the rectangular wave forming circuit 317, and the PWM control signal and the first output terminal 151 and the second output terminal 152 are corrected. In some cases, the relationship with the output voltage to be output is adjusted correctly.

When starting the output of the PWM control signal from the PWM signal generation section 441, when the zero-cross signal is input from the rectangular wave forming circuit 317 to the central control means 310, the central control means 310 controls the synchronous operation control. The operation of the unit 437 is started. The synchronous operation control unit 437 determines whether the frequency of the voltage generated between the first output terminal 151 and the second output terminal 152 matches the frequency set by the setting switch 318 according to the input interval of the zero cross signal. Is determined first.

If the frequencies match, it is determined from the output voltage signal whether or not the peak voltage is substantially equal to the peak value of the voltage set by the setting switch 318. In this way, the state of the voltage generated between the first output terminal 151 and the second output terminal 152 is compared with the frequency and voltage set by the setting switch 318, and it is determined that they do not match the set values. Then, an abnormal signal is output to the display control unit 425 without starting the operation of the PWM signal generation unit 441, and the display control unit 425 outputs a required display signal to the operation state display unit 427.

When the frequency and voltage of the detected voltage match the frequency and voltage of the set value, the PWM signal generator 441 starts operating in accordance with the rise of the zero-cross signal from the rectangular wave forming circuit 317. Then, the PWM reference value of the PWM reference table is read from the head, and the output of the PWM control signal is started. When the operation of the PWM signal generation unit 441 starts, a PWM control signal is formed based on the corrected reference value obtained by correcting the PWM reference value by the correction value Y by the output voltage waveform monitoring unit 433 in the same manner as in the above-described independent operation. .

In this way, the operation of the inverter circuit 130 is started, and a single-phase AC voltage is output between the first output terminal 151 and the second output terminal 152 via the low-pass filter 140. The portable generator, which is an AC power supply device, that corrects the sinusoidal single-phase AC voltage while making the phase and voltage of the AC voltage input between the first output terminal 151 and the second output terminal 152 coincide with each other. Can output from 100.

After starting the synchronous operation, the synchronous operation control section 437 sends the PWM signal to the central control section 310 every time the PWM signal generation section 441 outputs a PWM control signal based on 0 which is the leading value of the PWM reference value. The input zero-cross signal is determined, and phase adjustment control between the portable generator 100 and another generator is performed. When the PWM control signal based on the PWM reference value is output as shown in (1) of FIG. 5, the single-phase AC voltage that is the output voltage at the time of the synchronous operation is (3) in FIG.
A sine wave having a zero-cross point substantially coincident with 0 of the PWM reference signal shown as a sine wave of a
Output. However, when the phase of the voltage output by the portable generator 100 via the low-pass filter 140 and the sine wave voltage output by the other generators are shifted as shown by c in FIG. 5C. , The voltage generated between the first output terminal 151 and the second output terminal 152 is shown in FIG.
As shown by (b) in (3) above, a voltage is obtained by combining the two voltages. In other words, the zero cross point of the reference sine wave shown in (1) of FIG. 5 becomes a sine wave shown in (2) of FIG. 5 and the zero cross point of the output voltage signal deviates from the zero cross point of the reference sine wave. become.

Therefore, the PWM based on the PWM reference value of 0
At the timing when the control signal is output, if the rectangular wave serving as the zero-cross signal of the output voltage is at the L level, the single-phase AC voltage output from the portable generator 100 is output by another generator operating in parallel. The synchronous operation control unit 437 determines that the phase is ahead of the voltage to be synchronized, and performs control to lengthen the cycle of the reference sine wave used as the PWM control signal.

If the rectangular wave serving as the zero cross signal of the output voltage is at the H level at the timing when the PWM control signal based on the PWM reference value of 0 is output, the synchronous operation control unit
437 performs control to shorten the cycle of the reference sine wave. This P
When adjusting the cycle of the reference sine wave formed by the WM control signal, the synchronous operation control unit 437 sets the PWM reference value to PWM
This is for changing the interval between clocks read from the M reference table.

This clock interval controls the frequency divider circuit that forms the clock for reading the PWM reference value, and makes the time of one clock (the time interval of one step in the PWM modulation cycle) longer or shorter by several percent to ten percent. Approximately several to ten clock signals out of one hundred to several hundred clocks forming one cycle are formed. As described above, the first sine wave at the timing of the zero-cross point by the PWM control signal generated by the PWM signal
To detect the positive or negative of the voltage generated between the output terminal 151 and the second output terminal 152, that is, the shift of the zero cross point between the reference sine wave and the output voltage, and to adjust the output timing of the reference sine wave, The effect based on the phase difference between the output voltage and the output current depending on the type can be eliminated, and the phase difference between the output voltages of another generator and the portable generator 100 can be accurately corrected.

In correcting the reference sine wave, several to ten pulses of the clock signal for changing the time interval of one step by several percent to ten percent are formed. The rate can be adjusted to about 0.3% or less, and the fluctuation amount can be adjusted to less than 0.2 Hz for 50 Hz or 60 Hz.

Further, the frequency of the reference sine wave is adjusted by the PWM control signal by adjusting the pulse interval of the clock signal, ie, P
It only changes the output interval of the WM control signal by about several percent to ten percent, and does not change the number of pulse signals used as the PWM control signal and the pulse width of each pulse used as the PWM control signal, which is the value of each PWM control signal. Therefore, P
The reference sine wave generated by the WM control signal and the portable generator
The period can be adjusted and changed while smoothly changing the waveform of the single-phase AC voltage output by 100.

In forming several to ten clock pulses in which the clock pulse interval is changed by several percent to ten percent, the clock pulse in which the clock pulse interval is changed may be formed continuously. . Further, the clock pulses whose clock pulse intervals are changed may be dispersed within one cycle of the reference sine wave, and the pulse interval may be changed for a required number of clock pulses formed during one cycle. .

When the PWM signal generation unit 441 is operated by the synchronous operation control unit 437, the output voltage waveform monitoring unit 433 is operated in the same manner as when the PWM signal generation unit 441 is operated by the isolated operation control unit 435. When the output voltage is adjusted and the waveform is shaped, and when the increase in the rotation speed of the AC generator 50 does not follow a sudden increase in the load, a control for greatly changing the value of the variable K as the coefficient of the current correction term is performed. The synchronous operation control unit 437 controls the PWM signal generation unit 441 to operate while the output voltage waveform monitoring unit 433 performs the operation or changes the value of the variable K, which is a coefficient of the PWM reference value or the correction reference value, to a small value. The generator 441 is operated to lower the output voltage.

Further, the synchronous operation control unit 437 calculates the coefficient of the PWM reference value or the correction reference value based on the DC voltage signal from the DC voltage detection circuit 320 and the conductivity detection signal input to the conductivity detection unit 419. Is also controlled to change the value of the variable K 'to a larger value. The variable K ′ as a coefficient of the PWM reference value and the correction reference value also has a normal value of “1”,
The operation rate of the DC voltage generation circuit 110 based on the conductivity detection signal is equal to or less than a low predetermined value such as tens of percent,
The DC voltage is close to the set voltage of the constant voltage detection circuit 180 or the operation rate is almost 0% and the DC voltage is a constant voltage detection circuit.
For example, when the voltage exceeds the set voltage of 180, the variable K ′ is changed to a value that is several percent larger than 1 and PW
This is to change the pulse width of the M control signal to be large.

As described above, although the operation rate of the DC voltage generation circuit 110 in the portable generator 100 is low,
When the voltage of the DC power supply unit 120 is high, the output voltage generated between the first output terminal 151 and the second output terminal 152 is high, the output power of the portable generator 100 is small, and the parallel operation is performed. Since the DC voltage is maintained at a high potential because the output of the other generators is large, the PWM
By increasing the value of the variable K ′, which is a coefficient of the reference value or the modified reference value, and increasing the output voltage of the inverter circuit 130, the output of the portable generator 100 is increased to increase the output of the portable generator 100. Load sharing can be increased.

When the value of the variable K 'is switched to a large value, it is necessary to gradually increase the value in accordance with the DC voltage value so that the higher the detected value of the DC voltage, the larger the value. preferable. The synchronous operation control unit 43
In 7, the output voltage is adjusted by adjusting the pulse width value of the PWM control signal also based on the output current value from the output current detection circuit 330.

The adjustment of the output voltage based on the output current value is performed by adjusting the output current signal so that the current value output from the first output terminal 151 or the second output terminal 152 is 85% to 90% of the rated current value. When it exceeds
By changing the value of the coefficient multiplied by the PWM reference value or the modified reference value so as to reduce the value of the single-phase AC voltage by about 1%, the pulse width of the pulse signal to be the PWM control signal is slightly reduced. It modifies and changes table values.

As described above, when the output current value has increased to a value close to the rated current value, the output voltage is slightly reduced, so that the output voltage of the portable generator 100 is slightly reduced, and the parallel operation is performed. The load sharing of the generator performing the operation can be prevented from being excessively biased toward one of the generators. In the central control unit 310, the output voltage waveform monitoring unit 433 and the PWM signal generation unit 441 together with the isolated operation control unit 435 and the parallel operation control unit 437 connect the first output terminal 151 and the second output terminal 152. Although the PWM control signal is formed so that the generated output voltage has a predetermined sine wave shape,
The correction of the PWM reference value to form the M control signal is P
When adding or multiplying the PWM reference value of the first half cycle of the WM reference table, subtraction or division may be performed on the PWM reference value of the second half cycle of the PWM reference table.

As described above, whether the voltage conversion in which the output voltage V becomes 0 when the PWM reference value or the modified reference value is 0 is performed, or whether the PWM reference value is always a positive value Switching between addition and subtraction or multiplication and division in the first half cycle and the second half cycle, or addition, subtraction, multiplication or division throughout one cycle in accordance with an arithmetic method such as whether the PWM reference value is a positive or negative value. By performing the calculation, as shown in FIG.
In a half cycle in which the first output voltage V1 which is the output voltage of the first output terminal 151 is larger than the second output voltage V2 which is the output voltage of the second output terminal 152, the first output obtained by lowering the first output voltage V1. The output voltage V, which is the difference voltage between the two terminals, is reduced by the voltage v1 and the first output voltage V1 is increased in a half cycle in which the first output voltage V1 is smaller than the second output voltage V2. Similarly, the output voltage V can be reduced.

Further, the central control means 310 controls the DC voltage generation circuit 110 by the circuit protection section 431, and controls the engine speed by the throttle opening control section 423. The DC voltage generation circuit 110 by the circuit protection unit 431
Is performed by the stop circuit 360 via the thyristor control circuit 170. As shown in FIG. 3, the stop circuit 360 includes a switching transistor 361 having a base connected to the central control means 310, an emitter of the switching transistor 361 is grounded, and a collector of the switching transistor 361 is connected to the photocoupler 175. It is connected to the cathode of the light emitting diode 177.

When controlling the DC voltage generation circuit 110 by the stop circuit 360, the circuit protection unit 431 is used when the engine is started until the rotation speed signal input from the rotation speed detection circuit 319 is stably maintained. To output a stop control signal to the stop circuit 360 to turn on the light emitting diode 177 and prevent the thyristor control circuit 170 from outputting a conduction signal.

When the engine speed is stabilized, the output of the stop control signal is stopped, and the DC voltage detection circuit 32
The voltage of the DC power supply unit 120 becomes 16
After confirming that the voltage reaches a predetermined voltage of 0 to 200 volts, the isolated operation control unit 435 or the synchronous operation control unit 437
, The output of the PWM control signal from the PWM signal generation unit 441 is started.

Further, the engine is controlled by rotating the pulse motor of the throttle control mechanism 315 forward or backward by the engine speed detector 421 and the throttle opening controller 423 via the throttle driver 313. As described above, the engine speed control is performed according to the ratio of the time during which the conduction signal is output to the DC voltage generation circuit 110 by the cathode potential of the light emitting diode 177 in the photocoupler 175, that is, the throttle in accordance with the conduction rate of the thyristor 111. The opening signal input from the control mechanism 315 is set to a predetermined value, or the count value of a pulse counter of the throttle control mechanism 315 is set to a predetermined value, and a predetermined engine speed is adjusted according to the output.

Therefore, it is possible to correct the throttle opening in accordance with the operation rate of the DC voltage generation circuit 110 and to perform highly efficient voltage conversion. The opening signal input from the throttle control mechanism 315 in accordance with the output current signal from the output current detection circuit 330 or the count value of the pulse counter of the throttle control mechanism 315 is set to a predetermined value, and the throttle corresponding to the output is set. The opening degree may be controlled.

In this portable generator 100, when an overcurrent exceeding the rated current flows, the circuit protection unit 431 of the central control means 310 performs control to stop the operation of the DC voltage generation circuit 110 and the inverter circuit 130. In addition, the power circuit 101 is protected by stopping the output of the single-phase AC voltage, and the control of stopping the operation of the DC voltage generation circuit 110 by the overcurrent detection circuit 350 is performed.

Circuit protection section 431 for protecting power circuit 101
When the output current value exceeds 1.2 times the rated voltage, PW is applied after a duration of several seconds to several minutes.
The output of the PWM control signal output from the M signal generation unit 441 is stopped, and the output of the stop control signal to the stop circuit 360 is started. When the output current value is large according to a value exceeding 1.2 times the rated current, the output of the stop control signal is started in a short duration and the output of the PWM control signal is stopped by the PWM signal generation unit 441. When the value exceeding the rated current is small, the output of the stop control signal and the output stop of the PWM control signal are controlled for a somewhat longer duration to stop the output of the single-phase AC voltage. When the value of the output current reaches more than twice the rated voltage, the output of the PWM control signal is immediately stopped, and the output of the stop control signal is started to stop the output of the single-phase AC voltage.

Further, when the value of the DC voltage detected by the DC voltage detecting circuit 320 or the value of the output voltage detected by the output voltage detecting circuit 340 becomes abnormally high, the output voltage is a set value. For example, the circuit protection unit 431 sends a stop control signal to the stop circuit 360 when detecting that an abnormal voltage has occurred in the power circuit 101, such as when the voltage drops significantly above 100 volts or when a voltage lower than 100 volts continues. Then, the output of the single-phase AC voltage from the first output terminal 151 and the second output terminal 152 is stopped by causing the PWM signal generation unit 441 to stop outputting the PWM control signal.

The overcurrent detection circuit 350 provided separately from the central control means 310 outputs an L-level stop signal to the photocoupler 175 when the output current reaches nearly twice the rated voltage. Then, the output of the conduction signal output from the thyristor control circuit 170 to the DC voltage generation circuit 110 is stopped.
For this reason, when the value of the output current reaches nearly twice the rated voltage, each thyristor 111 of the DC voltage generation circuit 110 is turned off, and the power supply from the AC generator 50 to the DC power supply unit 120 is performed. Is stopped. Therefore, the output voltage of DC power supply unit 120 drops.

Therefore, the output voltage of DC power supply
A first PWM signal and a second PWM signal based on a PWM control signal having a constant duty ratio and an AC voltage by the M control.
The output voltage, which is the potential difference between the first output terminal 151 and the second output terminal 152 formed by the WM signal, decreases, the load current also decreases, and the output current exceeds twice the rated current and the single-phase AC voltage immediately. Can be prevented from being stopped, and the output of the single-phase AC voltage can be stopped in a very short time because the output current value is much more than 1.2 times the rated current.

The overcurrent detection circuit 350 is limited to the case where the reference voltage is set so as to output a stop signal when the output current detection circuit 330 detects a current value nearly twice the rated current value. Without, when a current exceeding 1.5 times the rated current value is about to flow, the rectifying operation of the DC voltage generation circuit 110 is stopped, and the power supply from the AC generator 50 to the DC power supply unit 120 is stopped, For example, when reducing the output voltage, the characteristics and durability of the elements forming the power circuit 101,
In addition, according to the safety standard, the central control means 310 is set as an appropriate value together with the output current value when the stop control signal is output.

[0152]

According to the first aspect of the present invention, there is provided a portable telephone in which an AC voltage is once converted to DC by a DC voltage generation circuit to form a predetermined DC voltage, and then a single-phase AC voltage is formed and output by an inverter circuit. In the generator for use, when the operating rate of the DC voltage generating circuit is substantially the maximum operating rate and the throttle opening is almost fully opened, or when the throttle opening is almost fully opened and the engine speed is lower than a predetermined specified value. When the output voltage is low, the output voltage of the inverter circuit is reduced, and the output of the portable generator is adjusted.

Accordingly, when the load suddenly increases, the output voltage of the inverter circuit, that is, the output voltage from the output terminal is reduced, so that the load of the portable generator is temporarily reduced, and the rotation speed of the AC generator is rapidly increased. To quickly obtain output power according to the load. According to a second aspect of the present invention, there is provided a portable generator for generating a single-phase AC voltage with an inverter circuit and outputting the single-phase AC voltage after converting the AC voltage into a DC voltage by a DC voltage generating circuit. The necessary PWM reference table is provided for P
An output voltage is stabilized by calculating a correction value based on a difference value obtained by comparing each PWM reference value of the WM reference table with the output voltage value, obtaining a correction reference value based on the correction value, and forming a PWM control signal. Accordingly, when the operation rate of the DC voltage generation circuit becomes substantially the maximum operation rate and the throttle opening is almost fully opened, or when the throttle opening is almost fully opened and the engine speed is lower than a predetermined specified value, This is an output adjustment method for a portable generator in which the output voltage is decreased by increasing or decreasing the correction value.

Therefore, the output voltage can be adjusted using a microcomputer without using a plurality of PWM reference tables. When the load suddenly increases, the output voltage from the output terminal is decreased, thereby temporarily reducing the load and quickly increasing the number of revolutions of the engine, that is, the power generation amount, and obtaining the output power according to the load. You can do so.

According to the third aspect of the present invention, the correction value is obtained by replacing the value of the selected variable value with a larger value by using the product of the output current value and the selected variable value as a coefficient. A method for adjusting the output of a portable generator according to claim 2, wherein the correction value is changed by the method. Therefore, when the output current value is large, the correction value can be largely changed even when the variable value is constant, and when the load is large, the fluctuation range of the output voltage can be slightly increased to quickly respond to the operation state according to the load. it can.

The present invention according to claim 4 has an AC generator, a DC voltage generating circuit for converting an AC voltage generated by the AC generator into DC, and a DC power supply unit for holding the DC voltage. A portable power generator serving as an inverter circuit for converting an output voltage of a DC power supply unit into a single-phase AC voltage, wherein a duty ratio detecting unit for detecting an operation rate of the DC voltage generation circuit and a PWM for controlling the inverter circuit; A signal generation unit, a central operation control unit including an independent operation control unit, a synchronous operation control unit, and a throttle opening control unit, and a voltage between output terminals is detected to output an output voltage signal; The single operation control unit and the synchronous operation control unit have an operation rate of the DC voltage generation circuit that is almost the maximum operation rate and the throttle opening degree is almost fully open. Was Can, it is an portable generator for controlling lowering the output voltage by changing the pulse width of the PWM control signal.

Therefore, when the load suddenly increases, the output voltage is reduced to lighten the load of the portable generator, the rotation speed of the AC generator is rapidly increased, and the power generation amount is quickly increased. Output power according to the load can be obtained. Furthermore, the present invention described in claim 5 has an AC generator, and has a DC voltage generating circuit for converting an AC voltage formed by the AC generator into DC, and a DC power supply unit for holding the DC voltage, Further, the present invention is a portable generator serving as an inverter circuit for converting an output voltage of a DC power supply unit into a single-phase AC voltage, wherein a duty ratio detecting unit for detecting an operation rate of the DC voltage generation circuit and a PWM signal for controlling the inverter circuit. It has a generating unit and a central control unit having an independent operation control unit and a synchronous operation control unit, a throttle opening control unit and an engine rotation speed detection unit, and detects a voltage between output terminals to generate an output voltage signal. An output voltage detecting means for outputting a zero-cross signal in accordance with the output voltage, wherein the independent operation control unit and the synchronous operation control unit perform throttle opening control close to full throttle opening and the engine speed is a predetermined value. Is lower than a specified value, it is an portable generator for controlling lowering the output voltage by changing the pulse width of the PWM control signal.

Therefore, when the load suddenly increases and the rotational speed of the engine does not rise rapidly following the increase in load, the load is temporarily reduced by lowering the output voltage, and the engine speed is rapidly increased. As a result, the generated power can be quickly increased to output the output power according to the load. The present invention described in claim 6 has an AC generator, a DC voltage generating circuit that converts an AC voltage formed by the AC generator into a DC, and a DC power supply unit that holds the DC voltage. A portable generator having an inverter circuit for converting an output voltage of a DC power supply unit to a single-phase AC voltage and outputting an output of the inverter circuit from an output terminal, wherein a duty factor for detecting an operation rate of the DC voltage generation circuit Calculates based on the PWM signal generator, independent operation controller, synchronous operation controller, and throttle opening controller, engine speed detector, and the detected output voltage and output current values that control the detector and inverter circuit. And a PWM signal generation unit, comprising: a central control unit having an output voltage waveform monitoring unit that performs
A PWM control signal corresponding to the reference value is formed, and the output voltage waveform monitoring unit subtracts or adds a value obtained by multiplying the detected output current value by a coefficient from a difference between each voltage table value and the detected output voltage value. The correction value is calculated and stored, and the next P
When the PWM signal generation unit forms a PWM control signal based on the WM reference value, a PWM control signal is formed based on a corrected reference value obtained by subtracting or adding a correction value from the PWM reference value. The synchronous operation control unit is configured to operate when the operation rate of the DC voltage generation circuit is substantially the maximum operation rate and the throttle opening is almost fully opened, or when the opening control by the throttle opening control unit is close to the throttle fully opened and the engine is closed. When the rotation speed is lower than the predetermined specified value, the value of the coefficient for calculating the correction value in the output voltage waveform monitoring unit is changed to a large value, or the value of the coefficient to be multiplied by the PWM reference value or the correction reference value is reduced. This is a portable generator for lowering the voltage value of the single-phase AC voltage.

Therefore, when the load suddenly increases and the output of the portable generator does not follow the load, it is possible to reduce the output voltage to temporarily reduce the load on the portable generator and make the output correspond to the load. it can. When the coefficient of the correction value is changed, the correction value is obtained by subtracting or adding a value obtained by multiplying the output current value and the coefficient. Therefore, when the output current value is large, the load can be greatly reduced by rapidly reducing the load. The engine speed can be increased.

The present invention described in claim 7 provides a portable generator that converts an AC voltage into a DC voltage by a DC voltage generating circuit to form a predetermined DC voltage, and then forms and outputs a single-phase AC voltage. When the operation rate of the DC voltage generation circuit is lower than a specific value and the DC voltage value converted to DC is higher than a predetermined voltage value, the output of the portable generator is increased by increasing the output voltage. Things.

Therefore, when the voltage between the output terminals is high and there is little external power inflow or almost no output from the output terminal, the output voltage of the portable generator is raised by increasing the output voltage. The portable generator can be brought into an appropriate load state. Further, according to the present invention, in a portable generator that converts an AC voltage into a DC voltage by a DC voltage generating circuit and then forms and outputs a single-phase AC voltage by an inverter circuit, a PWM reference table is provided, A correction value is calculated based on a difference value obtained by comparing each PWM reference value and the output voltage value, and a correction reference value is calculated by adding or subtracting the correction value to or from the PWM reference value. Forming a PWM control signal based on the PWM control signal and controlling the inverter circuit so that when the operation rate of the DC voltage generation circuit is lower than a specific value and the DC voltage value of the DC voltage is higher than a predetermined voltage value, the PWM reference value or An output adjustment method for a portable generator in which the output voltage of an inverter circuit is increased by decreasing or increasing the correction reference value.

Therefore, the output voltage can be easily adjusted using a microcomputer without using a plurality of PWM reference tables, and the output voltage of the portable generator can be maintained high and the output power can be maintained during parallel operation. Is extremely small, the output power is increased by increasing the output voltage, and the portable generator can be placed in an appropriate load state.

Further, the present invention according to claim 9 has a DC voltage generating circuit for temporarily converting an AC voltage into a DC, and a DC power supply for holding the DC voltage. A portable generator that has an inverter circuit for converting to a single-phase AC voltage and outputs the output of the inverter circuit from an output terminal, and controls a conductivity detection unit and an inverter circuit that detect an operation rate of a DC voltage generation circuit. A DC voltage detection circuit having a PWM signal generation unit and a central control unit including an isolated operation control unit and a synchronous operation control unit, detecting an output voltage of the DC power supply unit and outputting a DC voltage signal; Output voltage detecting means for detecting a voltage, outputting an output voltage signal, and also outputting a zero-cross signal according to the timing of the output voltage, wherein the synchronous operation control unit detects the DC voltage detected by the conductivity detection unit. When the operation rate of the road is lower than a specific value and the output voltage of the DC power supply unit is higher than a predetermined voltage value, the portable signal generator is also configured to control the PWM signal generation unit to increase the output voltage. .

Therefore, when the output voltage of the portable generator is kept high and the output power is extremely small, the output of the portable generator is increased by increasing the output voltage of the portable generator. An appropriate load state can be set, and stable parallel operation can be performed. The present invention according to claim 10 includes a DC voltage generating circuit for temporarily converting an AC voltage into DC, and a DC power supply for holding the DC voltage. Further, the output voltage of the DC power supply is converted to a single-phase AC voltage. A portable generator having an inverter circuit for converting an output voltage from an output terminal to an output terminal, a duty ratio detecting unit for detecting an operation rate of a DC voltage generation circuit, and a PWM signal for controlling the inverter circuit. A PWM signal generation unit having a central control unit including a generation unit, an independent operation control unit, a synchronous operation control unit, and an output voltage waveform monitoring unit that performs an operation based on the detected output voltage and output current values; Forms a PWM control signal sequentially corresponding to the PWM reference value, and the output voltage waveform monitoring unit calculates a correction value obtained by adding or subtracting a value obtained by multiplying a difference between the voltage table value and the output voltage value by a coefficient. Each P M
The correction value corresponding to the reference value is stored, and the next PWM
When the control signal is generated by the PWM signal generation unit, the PWM signal
A PWM control signal is formed based on the corrected reference value obtained by subtracting or adding the correction value from the reference value, and the synchronous operation control unit determines that the operation rate of the DC voltage generation circuit detected by the conductivity detection unit is lower than a predetermined value. And when the output voltage of the DC power supply is higher than a predetermined voltage value, the correction reference value calculated by the output voltage waveform monitoring unit or the coefficient value to be multiplied by the PWM reference value is changed to change the voltage value of the single-phase AC voltage. And a portable generator that raises the power.

Therefore, when the output voltage of the portable generator is kept high and the output power is extremely small, the output of the portable generator is increased by increasing the output voltage of the portable generator. The load can be set to an appropriate load, and stable parallel operation can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an entire portable generator according to the present invention.

FIG. 2 is a circuit block diagram mainly showing a power supply unit of the portable generator according to the present invention.

FIG. 3 is a circuit block diagram mainly showing a detection circuit of the portable generator according to the present invention.

FIG. 4 is a block diagram showing an outline of central control means of the portable generator according to the present invention.

FIG. 5 is a graph showing a voltage output state of the portable generator according to the present invention.

FIG. 6 is a graph showing an example of a phase difference between an output voltage and an output current.

FIG. 7 is a graph showing a correction state of an output voltage.

FIG. 8 is a circuit block diagram showing an example of a conventional portable generator.

FIG. 9 is a schematic diagram showing an output voltage.

FIG. 10 is a circuit block diagram showing an example of another conventional portable generator.

[Explanation of symbols]

Reference Signs List 50 AC generator 51 Three-phase output winding 55 Single-phase output winding 100 Portable generator 101 Power circuit 110 DC voltage generation circuit 111 Thyristor 115 Rectifier diode 120 DC power supply unit 121 Main smoothing capacitor 130 Inverter circuit 140 Low-pass filter 151 First 1 output terminal 152 second
Output terminal 160 Gate voltage generation circuit 170 Thyristor control circuit 180 Constant voltage detection circuit 201 Control power supply section 210 Smoothing circuit 221 First constant voltage circuit 225 Second
Constant voltage circuit 230 Regulator 235 Constant voltage circuit 240 Voltage control circuit 250 PWM signal generation circuit 255 Inverter drive circuit 260 Overload detection circuit 265 Operation circuit section 269 Overload detection circuit 270 Sine wave generation circuit 281 Triangular wave generation circuit 285 PWM control signal generation Circuit 291 Square wave generation circuit 293 Start timing circuit 295 Square wave generation circuit 297 Phase comparison circuit 299 Limit value detection circuit 310 Central control means 311 PWM driver 313 Throttle driver 315 Throttle control mechanism 317 Square wave detection circuit 319 Rotation speed detection circuit 320 DC Voltage detection circuit 330 Output current detection circuit 340 Output voltage detection circuit 350 Overcurrent detection circuit 432 Throttle opening control unit 431 Circuit protection unit 433 Output voltage monitoring unit 435 Single Operation control unit 435 synchronous operation control unit 441 PW
M signal generator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-178599 (JP, A) JP-A-4-38199 (JP, A) JP-A-4-150799 (JP, A) JP-A-4-17899 153532 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02P 9/04

Claims (10)

(57) [Claims] An AC generator is operated by an engine to generate an AC voltage, and the AC voltage is once converted to DC by a DC voltage generating circuit to form a DC voltage of a predetermined voltage, and then at a predetermined frequency by an inverter circuit. In a portable generator that forms a single-phase AC voltage having a constant and constant voltage and outputs the single-phase AC voltage from an output terminal, the operation rate of the DC voltage generation circuit is detected, and the operation rate is determined to be a predetermined value. The throttle opening of the engine is controlled so that the operating rate of the DC voltage generating circuit is substantially the maximum operating rate and the throttle opening is almost fully opened, or the engine is rotated when the throttle opening is almost fully opened. A method for adjusting the output of a portable generator, wherein when the number is lower than a predetermined value, control is performed to decrease the output voltage of the inverter circuit. 2. An AC generator is operated by an engine to generate an AC voltage. The AC voltage is once converted into a DC voltage by a DC voltage generating circuit to form a DC voltage of a predetermined voltage, and then the AC voltage is generated at a predetermined frequency by an inverter circuit. In a portable generator that forms a single-phase AC voltage having a constant and constant voltage and outputs the single-phase AC voltage from an output terminal, a PWM reference table, which is a reference table of a PWM control signal for controlling an inverter circuit, A correction value is calculated based on a difference value obtained by comparing each PWM reference value of the PWM reference table with the output voltage value, and a correction reference value is calculated by adding or subtracting the correction value to or from the PWM reference value. Generates a PWM control signal based on the corrected reference value to stabilize the output voltage, the operation rate of the DC voltage generation circuit is substantially the maximum operation rate, and the throttle opening is fully opened. When the engine speed is lower than a predetermined value when the throttle opening is close to full throttle or when the engine speed is lower than a predetermined value, the output voltage of the inverter circuit is decreased by increasing or decreasing the correction value. How to adjust the output of a portable generator. 3. The correction value is characterized by changing the value of the correction value by increasing the value of the selected variable value by using the product of the output current value and a variable value that has selected a predetermined value as a coefficient. The method for adjusting the output of a portable generator according to claim 2. 4. An AC generator for generating an AC voltage, a DC voltage generating circuit for forming an AC voltage by rotating the AC generator, and converting the AC voltage to a DC once, and a DC voltage generating circuit for the DC voltage A DC power supply that holds the DC voltage output by the DC power supply, further comprising an inverter circuit that converts the output voltage of the DC power supply into a single-phase AC voltage having a predetermined frequency and a constant voltage, A portable generator for outputting, from an output terminal, an AC output voltage from which harmonics have been removed from an output of a circuit, wherein the P controls a duty ratio detecting unit for detecting an operation rate of a DC voltage generating circuit and an inverter circuit.
A central control unit including a WM signal generation unit, an independent operation control unit, a synchronous operation control unit, and a throttle opening control unit,
Further, output voltage detecting means for detecting a voltage between the output terminals, outputting an output voltage signal, and also outputting a zero-cross signal in accordance with the timing of 0 volt in the output voltage, wherein the isolated operation control unit outputs the output voltage signal from the output terminal An isolated operation control unit that starts output of a single-phase AC voltage when a zero-cross signal from an output voltage detection unit is not input within a predetermined short time before starting output of a single-phase AC voltage, and a synchronous operation control unit is ,
When a zero-cross signal is input within a predetermined short time before starting output of the single-phase AC voltage from the output terminal, the output of the single-phase AC voltage is started in accordance with the timing of the zero-cross signal, and The isolated operation control unit and the synchronous operation control unit are configured such that, when the operation rate of the DC voltage generation circuit is substantially the maximum operation rate and the throttle opening is almost fully opened,
A portable generator, wherein the PWM signal generator controls the pulse width of a PWM control signal to decrease the output voltage of an inverter circuit. 5. A DC voltage generating circuit which has an AC generator for generating an AC voltage, forms an AC voltage by rotating the AC generator, and converts the AC voltage into DC once. A DC power supply that holds the DC voltage output by the DC power supply, further comprising an inverter circuit that converts the output voltage of the DC power supply into a single-phase AC voltage having a predetermined frequency and a constant voltage, A portable generator for outputting, from an output terminal, an AC output voltage from which harmonics have been removed from an output of a circuit, wherein the P controls a duty ratio detecting unit for detecting an operation rate of a DC voltage generating circuit and an inverter circuit.
A WM signal generation unit, an independent operation control unit, a synchronous operation control unit,
Further, it has a central control means having an engine rotation speed detection unit and a throttle opening control unit, detects the voltage between output terminals, outputs an output voltage signal, and adjusts the output voltage to the timing of 0 volt. An output voltage detecting means for outputting a zero-cross signal is also provided, and the isolated operation control unit is configured to output the single-phase AC voltage from the output terminal within a predetermined short time before the zero-cross signal is input from the output voltage detecting means within a predetermined short time. A single operation control unit that starts output of a phase AC voltage, and a synchronous operation control unit outputs a zero cross signal when a zero cross signal is input within a predetermined short time before starting output of a single phase AC voltage from an output terminal. And the single operation control unit and the synchronous operation control unit start the output of the single-phase AC voltage in accordance with the timing of the opening. Is characterized by performing control to lower the output voltage of the inverter circuit by changing the pulse width of the PWM control signal to the PWM signal generation unit when the throttle speed is close to the full throttle and the engine speed is lower than a predetermined specified value. Portable generator. 6. A DC voltage generating circuit having an AC generator for generating an AC voltage, forming an AC voltage by rotating the AC generator, and converting the AC voltage into a DC once, and a DC voltage generating circuit for the DC voltage A DC power supply that holds the DC voltage output by the DC power supply, further comprising an inverter circuit that converts the output voltage of the DC power supply into a single-phase AC voltage having a predetermined frequency and a constant voltage, A portable generator for outputting, from an output terminal, an AC output voltage obtained by removing harmonics from an output of a circuit, a PW for controlling a duty ratio detecting unit for detecting an operation rate of a DC voltage generating circuit and an inverter circuit.
An M signal generation unit, an isolated operation control unit, a synchronous operation control unit, an engine rotation speed detection unit, a throttle opening control unit, and an output voltage waveform monitoring unit that performs calculations based on the detected output voltage and output current values. The PWM signal generation unit forms a PWM control signal having a pulse width sequentially corresponding to the PWM reference value stored in the PWM reference table, and the output voltage waveform monitoring unit The difference between the voltage table value indicating the output voltage corresponding to the value and the detected output voltage value is obtained, and a correction value is calculated by subtracting or adding a value obtained by multiplying the detected output current value by a coefficient from the difference value. The correction value corresponding to each PWM reference value is stored, and the next PWM control signal based on the PWM reference value is stored in P
When the WM signal generation unit forms, the PWM control signal is formed in the PWM signal generation unit based on the corrected reference value obtained by subtracting or adding the correction value from the PWM reference value, and the isolated operation control unit and the synchronous operation control unit The throttle opening is controlled by the throttle opening control unit so that the operation rate of the DC voltage generation circuit is set to a predetermined value, and the operation rate of the DC voltage generation circuit is substantially the maximum operation rate and the throttle opening is almost fully open. Or when the opening control by the throttle opening control unit is close to full throttle and the engine rotation speed is lower than a predetermined specified value, the output voltage waveform monitoring unit calculates a correction value. Change to a large value or PWM
A portable generator characterized in that the value of a coefficient to be multiplied by a reference value or a corrected reference value is reduced to lower the voltage value of a single-phase AC voltage. 7. An AC generator is operated by an engine to generate an AC voltage. The AC voltage is converted into a DC voltage by a DC voltage generating circuit to form a DC voltage of a predetermined voltage. In a portable generator that forms a single-phase AC voltage having a constant voltage and outputs the single-phase AC voltage from an output terminal, the operation rate of the DC voltage generation circuit is lower than a specific value, and When the value of the converted DC voltage is higher than a predetermined voltage value, the output voltage of the inverter circuit is increased. 8. An AC generator is operated by an engine to generate an AC voltage. The AC voltage is converted into a DC voltage by a DC voltage generating circuit to form a DC voltage of a predetermined voltage. Is a reference table for a PWM control signal for controlling an inverter circuit in a portable generator that forms a single-phase AC voltage having a constant voltage and outputs the single-phase AC voltage from an output terminal.
A WM reference table is provided, and each PWM of the PWM reference table is provided.
A correction value based on a difference value obtained by comparing the M reference value and the output voltage value is calculated, and a correction reference value is calculated by adding or subtracting the correction value to or from the PWM reference value, and the next time is based on the correction reference value. A PWM control signal is formed, and when the operation rate of the DC voltage generation circuit is lower than a specific value and the value of the DC voltage converted to DC is higher than a predetermined voltage value, the PWM reference value or the correction reference value is decreased or increased. The output voltage of the inverter circuit is increased by doing so. 9. A DC voltage generating circuit which has an AC generator for generating an AC voltage, forms an AC voltage by rotating the AC generator, and converts the AC voltage into DC once. A DC power supply that holds the DC voltage output by the DC power supply, further comprising an inverter circuit that converts the output voltage of the DC power supply into a single-phase AC voltage having a predetermined frequency and a constant voltage, A portable generator for outputting, from an output terminal, an AC output voltage from which harmonics have been removed from an output of a circuit, wherein the P controls a duty ratio detecting unit for detecting an operation rate of a DC voltage generating circuit and an inverter circuit.
A DC voltage detection circuit that has a central control unit including a WM signal generation unit, an isolated operation control unit and a synchronous operation control unit, detects an output voltage of the DC power supply unit and outputs a DC voltage signal, and an output terminal Output voltage detecting means for detecting a voltage between the output voltages, outputting an output voltage signal, and also outputting a zero-cross signal in accordance with a timing of 0 volt in the output voltage,
The isolated operation control unit is an isolated operation control unit that starts output of the single-phase AC voltage when a zero-cross signal is not input within a predetermined short time before starting output of the single-phase AC voltage from the output terminal. The control unit, when the zero-cross signal is input within a predetermined short time before starting the output of the single-phase AC voltage from the output terminal, starts the output of the single-phase AC voltage in synchronization with the timing of the zero-cross signal, When the operation rate of the DC voltage generation circuit detected by the conductivity detection section is lower than a specific value and the output voltage of the DC power supply section is higher than a predetermined voltage value, the PWM signal generation section changes the pulse width of the PWM control signal. A portable generator characterized by performing control to increase the output voltage of the inverter circuit by changing the output voltage. 10. A DC voltage generating circuit having an AC generator for generating an AC voltage, forming an AC voltage by rotating the AC generator, and converting the AC voltage into a DC once, and a DC voltage generating circuit for the DC voltage A DC power supply that holds the DC voltage output by the DC power supply, further comprising an inverter circuit that converts the output voltage of the DC power supply into a single-phase AC voltage having a predetermined frequency and a constant voltage, A portable generator for outputting, from an output terminal, an AC output voltage from which harmonics have been removed from an output of a circuit, comprising: a conductivity detection unit for detecting an operation rate of a DC voltage generation circuit; and a P for controlling an inverter circuit.
A WM signal generation unit, an independent operation control unit, a synchronous operation control unit,
Furthermore, a central control unit including an output voltage waveform monitoring unit that performs an operation based on the detected values of the output voltage and the output current is provided, and the PWM signal generation unit is configured to output the PWM reference value stored in the PWM reference table to the PWM reference value. A PWM control signal having a pulse width corresponding to each of the PWM control signals is sequentially formed, and the output voltage waveform monitoring unit obtains a difference between a voltage table value indicating an output voltage corresponding to each PWM reference value and a detected output voltage value. A correction value obtained by subtracting a value obtained by multiplying the value by a coefficient is calculated, a correction value corresponding to each PWM reference value is stored, and a PWM control signal based on the next PWM reference value is formed by the PWM signal generation unit. At this time, the PWM signal generation unit forms a PWM control signal based on the corrected reference value obtained by subtracting or adding the correction value from the PWM reference value, and the synchronous operation control unit operates the DC voltage generation circuit detected by the conductivity detection unit. The rate is lower than a certain value, and,
When the output voltage of the DC power supply is higher than a predetermined voltage value,
A portable generator, comprising: a synchronous operation control unit for increasing a voltage value of a single-phase AC voltage by changing a value of a coefficient multiplied by a correction reference value or a PWM reference value calculated by an output voltage waveform monitoring unit.